1. An air preheating apparatus, characterized by comprising:

a drive mechanism;

preheating mechanism, preheating mechanism includes support frame (100) and ripple gasket (200), support frame (100) with actuating mechanism links to each other, support frame (100) are equipped with accommodation space (101), ripple gasket (200) set up with moving in accommodation space (101) actuating mechanism drive under the circumstances of support frame (100) pivoted, ripple gasket (200) are in reciprocating motion in accommodation space (101).

2. The air preheating apparatus according to claim 1, wherein the support frame (100) includes a plurality of support plates, the driving mechanism being connected to at least one of the plurality of support plates, the support plates being connected end to end in sequence to form a polygonal support frame (100).

3. The air preheating apparatus according to claim 2, wherein the number of the preheating mechanisms is at least two, each of the preheating mechanisms surrounds the driving mechanism, and the number of the support plates is four, including a first support plate (110), a second support plate (120), a third support plate (130), and a fourth support plate (140);

the first support plate (110) is connected with the driving mechanism, the third support plate (130) is parallel to the first support plate (110), the first support plate (110) is provided with a first edge (111) and a second edge (112) which are arranged oppositely, the third support plate (130) is provided with a third edge (131) and a fourth edge (132) which are arranged oppositely, the second support plate (120) is connected with the first edge (111) and the third edge (131), and the fourth support plate (140) is connected with the second edge (112) and the fourth edge (132);

the first support plate (110) has a first width in a direction extending from the first edge (111) to the second edge (112), and the third support plate (130) has a second width in a direction extending from the third edge (131) to the fourth edge (132), wherein the first width is smaller than the second width.

4. The air preheating apparatus according to claim 3, wherein the supporting bracket (100) further comprises a partition plate (150), the partition plate (150) is located in the accommodating space (101), both ends of the partition plate (150) are connected to the second support plate (120) and the fourth support plate (140), respectively, the partition plate (150) divides the accommodating space (101) into a first space and a second space, and the first space and the second space are provided with the corrugated sealing sheet (200).

5. The air preheating apparatus according to claim 4, wherein the corrugated sealing sheet (200) is provided with a first perforation, the support frame (100) further comprising a first support bar and a second support bar (160);

the partition (150) is provided with a second through hole (151), the first support plate (110) is provided with a third through hole (113), the first support rod has a first end and a second end, the first end is matched with the second through hole (151), and the second end passes through the first through hole to be matched with the third through hole (113);

the third supporting plate (130) is provided with a fourth through hole (133), the partition plate (150) is provided with a fifth through hole (152), the second supporting rod (160) is provided with a third end and a fourth end, the third end is matched with the fourth through hole (133), and the fourth end penetrates through the first through hole to be matched with the fifth through hole (152).

6. The air preheating apparatus according to claim 5, wherein the preheating mechanism further comprises a first fastening member and a second fastening member (300), a first protrusion (153) is provided on a surface of the partition (150) facing away from the first support plate (110), the second through hole (151) penetrates through the first protrusion (153), the first protrusion (153) is provided with a sixth through hole (153a), an outer surface of the first end is provided with a seventh through hole, the sixth through hole (153a) and the seventh through hole each extend in a direction perpendicular to an axis of the second through hole (151), and the first fastening member is respectively engaged with the sixth through hole (153a) and the seventh through hole;

one surface of the third support plate (130) departing from the first support plate (110) is provided with a second convex part (134), the fourth through hole (133) penetrates through the second convex part (134), the second convex part (134) is provided with an eighth through hole (134a), the outer surface of the third end is provided with a ninth through hole, the eighth through hole (134a) and the ninth through hole both extend in the direction perpendicular to the axis of the fourth through hole (133), and the second fastener (300) is respectively matched with the eighth through hole (134a) and the ninth through hole.

7. The air preheating apparatus according to claim 5, wherein the preheating mechanism further includes a plurality of elastic pieces (400), the number of the corrugated sealing sheets (200) and the number of the elastic pieces (400) are each plural, the elastic pieces (400) are disposed between the adjacent corrugated sealing sheets (200) and are in contact with the corrugated sealing sheets (200), and the first support bar and the second support bar (160) are each in sliding fit with the elastic pieces (400).

8. The air preheating apparatus according to claim 7, wherein the preheating mechanism further comprises a pressing member (500), the pressing member (500) is located in the accommodation space (101), the first support bar and the second support bar (160) are each slidably fitted with the pressing member (500), and one end of the pressing member (500) is in contact with the corrugated sealing sheet (200);

under the condition that the pressing piece (500) slides, the pressing piece (500) drives at least part of the corrugated sealing sheet (200) to move.

9. The air preheating apparatus according to claim 8, wherein the extrusion member (500) is provided with a threaded hole, one end of each of the first and second support bars (160) is externally threaded, and each of the first and second support bars (160) is screw-fitted with the extrusion member (500).

10. The air preheating apparatus according to claim 9, wherein the pressing member (500) is a nut, the preheating mechanism further comprises an auxiliary member (600), one end of the auxiliary member (600) is connected to the nut, and the other end of the auxiliary member (600) is in contact with the corrugated sealing sheet (200);

in the extension direction of the first and second support bars (160), the nut has a first length, the auxiliary (600) has a second length, and the external thread has a third length, wherein the sum of the first and second lengths is equal to the third length.

Background

In order to improve the heat exchange performance of the boiler and reduce the energy consumption, the air preheating device preheats the air about to enter the boiler.

Air preheating equipment is generally divided into three types, namely a plate type, a pipe type and a rotary type. The rotary air preheating device drives the preheating mechanism to rotate through the driving mechanism, when the preheating mechanism rotates to a smoke exhaust port of the boiler, the heat in the exhausted smoke is absorbed by the corrugated sealing sheet arranged on the preheating mechanism, and when the preheating mechanism rotates to an air inlet of the boiler, the absorbed heat is transferred to the air to be introduced into the boiler, so that the temperature of the air is increased, and the heat exchange performance of the boiler is improved. However, when the flue gas is discharged, impurities such as dust in the flue gas can be gathered on the corrugated sealing sheet, the heat absorption performance of the corrugated sealing sheet can be affected if the impurities such as dust are not removed in time, the air preheating device needs to be stopped for removing the impurities such as dust on the corrugated sealing sheet, and the continuous operation of the air preheating device is not facilitated.

Disclosure of Invention

The purpose of the embodiment of the application is to provide an air preheating device, can avoid impurity such as dust to gather on the ripple gasket to improve the heat absorption performance of ripple gasket, and solve air preheating device and need carry out the shutdown operation to air preheating device when detaching impurity such as dust on the ripple gasket, be unfavorable for air preheating device's the problem of continuous operation.

In order to solve the technical problem, the present application is implemented as follows:

the embodiment of the application provides an air preheating device, includes:

a drive mechanism;

preheating mechanism, preheating mechanism includes support frame and ripple gasket, the support frame with actuating mechanism links to each other, the support frame is equipped with accommodation space, the ripple gasket set up with moving in accommodation space actuating mechanism drive under the support frame pivoted condition, the ripple gasket is in reciprocating motion in the accommodation space.

In this application embodiment, when the air preheating device during operation, actuating mechanism drive support frame rotates, and in the support frame pivoted, set up the corrugated sealing piece reciprocating motion in accommodation space, consequently, impurity such as dust on can in time shake off the corrugated sealing piece to avoid gathering on the corrugated sealing piece from impurity such as dust in the exhaust flue gas of boiler exhaust fume outlet, influence the heat absorption performance of corrugated sealing piece. And adopt above-mentioned mode can not need to carry out the shutdown operation to air preheating device when removing impurity such as dust on the ripple gasket to be favorable to air preheating device's continuous operation.

Drawings

FIG. 1 is a schematic structural diagram of a preheating mechanism disclosed in an embodiment of the present application;

FIG. 2 is a schematic view of a part of the preheating mechanism disclosed in the embodiment of the present application;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a cross-sectional view of a preheating mechanism disclosed in an embodiment of the present application;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is a cross-sectional view of the structure of FIG. 4 at another angle;

fig. 7 is an enlarged view at C in fig. 6.

Description of reference numerals:

100-support frame, 101-accommodation space, 110-first support plate, 111-first edge, 112-second edge, 113-third perforation, 120-second support plate, 130-third support plate, 131-third edge, 132-fourth edge, 133-fourth perforation, 134-second convex part, 134 a-eighth perforation, 140-fourth support plate, 150-partition plate, 151-second perforation, 152-fifth perforation, 153-first convex part, 153 a-sixth perforation and 160-second support rod;

200-corrugated sealing sheet;

300-a second fastener;

400-an elastic member;

500-an extrusion;

600-auxiliary parts.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The air preheating device provided by the embodiment of the present application is described in detail by specific embodiments and application scenarios thereof with reference to the accompanying drawings.

As shown in fig. 1 to 7, an embodiment of the present application provides an air preheating device including a driving mechanism and a preheating mechanism.

The drive mechanism may include a drive source and a transmission assembly through which the drive source is connected to the preheating mechanism. The driving source may be a motor or other mechanism that can drive the preheating mechanism to rotate, and the embodiment of the present application is not limited to a specific form of the driving source.

The driving mechanism can also comprise a speed reducer, the driving source is connected with the transmission assembly through the speed reducer, and the speed reducer is arranged coaxially with the output shaft of the driving source, so that a smaller rotating speed can be obtained, the torque can be increased, and the preheating mechanism can be driven to rotate more powerfully.

Preheating machine constructs including support frame 100 and corrugated sealing piece 200, and support frame 100 can be used for supporting corrugated sealing piece 200, and corrugated sealing piece 200 has heat absorption and heat conduction's performance, and exhaust heat in the boiler exhaust port can be absorbed to corrugated sealing piece 200, then gives the air that is about to get into the boiler with heat transfer to preheat the air, and then improve the heat exchange performance of boiler, reduce the energy consumption of boiler. The support frame 100 is connected with a driving mechanism, the support frame 100 is provided with an accommodating space 101, the corrugated sealing sheet 200 is movably arranged in the accommodating space 101, and under the condition that the driving mechanism drives the support frame 100 to rotate, the corrugated sealing sheet 200 reciprocates in the accommodating space 101.

In the process of the operation of the air preheating device, the driving mechanism can drive the supporting frame 100 to rotate, the corrugated sealing sheet 200 arranged in the supporting frame 100 rotates along with the supporting frame 100 synchronously, because the corrugated sealing sheet 200 is movably arranged in the accommodating space 101, therefore, the corrugated sealing sheet 200 can move towards the direction far away from the driving mechanism under the action of centrifugal force, and the displacement size of the corrugated sealing sheet 200 is mainly determined by the rotation speed of the supporting frame 100, therefore, when the rotation speed of the supporting frame 100 is increased, the centrifugal force is increased, the displacement of the corrugated sealing sheet 200 is also increased simultaneously, when the rotation speed of the supporting frame 100 is reduced, the centrifugal force is reduced, the corrugated sealing sheet 200 can move towards the direction close to the driving mechanism under the action of gravity, and meanwhile, the displacement of the corrugated sealing sheet 200 is also reduced. Therefore, the rotating speed of the support frame 100 can be increased or reduced, so that the displacement of the corrugated sealing sheet 200 can be increased or reduced, the corrugated sealing sheet 200 can move in the accommodating space 101 in a reciprocating manner, impurities such as dust in smoke discharged from a boiler smoke exhaust port are reduced and accumulated on the surface of the corrugated sealing sheet 200, a vent between the corrugated sealing sheets 200 is prevented from being blocked, continuous operation of the air preheating equipment is facilitated, and the working strength of an operator for cleaning the air preheating equipment can be reduced.

In the embodiment of the present application, when the air preheating device works, the driving mechanism drives the supporting frame 100 to rotate, and when the supporting frame 100 rotates, the corrugated sealing sheet 200 disposed in the accommodating space 101 reciprocates, so that impurities such as dust on the corrugated sealing sheet 200 can be shaken off in time, and the impurities such as dust in flue gas discharged from a boiler smoke discharge port are prevented from being collected on the corrugated sealing sheet 200, and the heat absorption performance of the corrugated sealing sheet 200 is affected. In addition, the air preheating device does not need to be stopped when impurities such as dust and the like on the corrugated sealing sheet 200 are removed, so that the continuous operation of the air preheating device is facilitated.

In one embodiment, the shape of the supporting frame 100 may be circular or oval, and since the outer surface of the circular or oval supporting frame 100 is an arc-shaped outer surface and the mounting surface of the driving mechanism is generally a plane, it is easy to mount the supporting frame on the driving mechanism because the contact area between the two is small. Thus, in another embodiment, the support frame 100 includes a plurality of support plates, and the drive mechanism is coupled to at least one of the plurality of support plates, each of which is coupled end-to-end in sequence to form the polygonal support frame 100. In this embodiment, the outer surface of the polygonal supporting frame 100 is a combination of a plurality of planes, and the contact area between the planes and the mounting surface on the driving mechanism is larger, thereby facilitating the mounting of the supporting frame 100.

In an alternative embodiment, the number of the preheating mechanisms is at least two, each of the preheating mechanisms surrounds the driving mechanism, and the number of the support plates is four, including the first support plate 110, the second support plate 120, the third support plate 130, and the fourth support plate 140. The first support plate 110 is connected with a driving mechanism, the third support plate 130 is parallel to the first support plate 110, the first support plate 110 is provided with a first edge 111 and a second edge 112 which are arranged oppositely, the third support plate 130 is provided with a third edge 131 and a fourth edge 132 which are arranged oppositely, the second support plate 120 is connected with the first edge 111 and the third edge 131, and the fourth support plate 140 is connected with the second edge 112 and the fourth edge 132; the first support plate 110 has a first width in a direction extending from the first edge 111 to the second edge 112, and the third support plate 130 has a second width in a direction extending from the third edge 131 to the fourth edge 132, wherein the first width is greater than or equal to the second width. That is, the size of the first support plate 110 is greater than or equal to the size of the third support plate 130, and the installation space on the driving mechanism is limited, in the above manner, the preheating mechanism occupies a larger installation space on the driving mechanism, so that the number of preheating mechanisms that can be connected on the driving mechanism is easily reduced, which is not beneficial to improving the preheating efficiency of the air preheating device. Thus, in another embodiment, the first width is less than the second width. That is to say, the size of the first supporting plate 110 is smaller than that of the third supporting plate 130, so that the installation space occupied when the preheating mechanism is connected with the driving mechanism is smaller, and thus a larger number of preheating mechanisms can be installed on the driving mechanism, thereby being more beneficial to improving the preheating efficiency of the air preheating device.

Optionally, the second support plate 120 has a first inclination angle with respect to the third support plate 130 and the fourth support plate 140 has a second inclination angle with respect to the third support plate 130, wherein the first inclination angle is greater or smaller than the second inclination angle. In this case, the size of each supporting plate forming the supporting frame 100 is different, and thus, it is not easy to manufacture the supporting frame 100. Therefore, in another alternative embodiment, the first tilt angle is equal to the second tilt angle. It is easy to understand that the shape of the supporting frame 100 in this embodiment is an isosceles trapezoid, and the supporting frame 100 is more convenient to manufacture.

In one embodiment, the polygonal supporting frame 100 is formed by connecting the supporting plates end to end in sequence, and there is no supporting member inside to reinforce the polygonal supporting frame 100, so the structural strength of the polygonal supporting frame 100 is poor, and therefore, when the driving mechanism drives the supporting frame 100 to rotate, the supporting frame 100 is easily deformed. In order to solve the problem, the support frame 100 may further include a partition 150, the partition 150 is located in the accommodating space 101, two ends of the partition 150 are respectively connected to the second support plate 120 and the fourth support plate 140, the partition 150 divides the accommodating space 101 into a first space and a second space, and the first space and the second space are both provided with corrugated sealing sheets 200. In this embodiment, the supporting frame 100 may be reinforced by the partition plate 150 to improve the structural strength of the supporting frame 100, thereby preventing the supporting frame 100 from being deformed when rotating. The number of the partition plates 150 may be one or more, and the embodiment of the present application is not limited thereto. The partition 150 may be disposed parallel to the first support plate 110, and more corrugated sealing sheets 200 may be disposed in the receiving space 101 to improve the heat exchange effect.

In a further alternative embodiment, the second support plate 120 and the fourth support plate 140 are respectively provided with a sliding slot, and the corrugated sealing sheet 200 is provided with a sliding portion, and the sliding portion is in sliding fit with the sliding slot. In this embodiment, the provision of the sliding grooves on the second support plate 120 and the fourth support plate 140 easily causes the structural strength of the support frame 100 to be deteriorated, and since the sizes of the corrugated sealing sheets 200 are different, it is troublesome to mount the corrugated sealing sheets 200 by the engagement of the sliding portions and the sliding grooves, and the difficulty of assembly is large. Thus, in an alternative embodiment, the corrugated sealing sheet 200 is provided with a first aperture, the support 100 comprises a first support bar and a second support bar 160, the partition 150 is provided with a second aperture 151, the first support plate 110 is provided with a third aperture 113, the first support bar has a first end and a second end, the first end is engaged with the second aperture 151, and the second end is engaged with the third aperture 113 through the first aperture. The third supporting plate 130 is provided with a fourth through hole 133, the spacer 150 is provided with a fifth through hole 152, the second supporting rod 160 has a third end and a fourth end, the third end is matched with the fourth through hole 133, and the fourth end is matched with the fifth through hole 152 through the first through hole. In this embodiment, there is no need to provide sliding grooves on the second support plate 120 and the fourth support plate 140, and therefore, the structural strength of the support frame 100 is not affected. In addition, when the corrugated sealing piece 200 is installed, the first perforation on the corrugated sealing piece 200 is matched with the first support rod and the second support rod 160, so that the assembly process of the corrugated sealing piece 200 can be simplified, and the installation difficulty of the corrugated sealing piece 200 is reduced. The number of the first support bar and the second support bar 160 may be one, or may be multiple, and this is not limited in the embodiments of the present application. Optionally, the number of the first support bars or the second support bars 160 is four, in this case, the first support bars or the second support bars 160 can be arranged in a matrix manner, which is beneficial to improving the stability of the corrugated sealing sheet 200 when sliding.

In the above embodiment, since there is no fastening member to fix the first and second support rods 160, when the driving mechanism drives the preheating mechanism to rotate, the first and second support rods 160 are easily separated from the support frame 100 by the centrifugal force. In order to avoid the above situation, the preheating mechanism may further include a first fastening member and a second fastening member 300, a first protrusion 153 is disposed on a surface of the partition board 150 facing away from the first support plate 110, the second through hole 151 penetrates through the first protrusion 153, the first protrusion 153 is provided with a sixth through hole 153a, a seventh through hole is disposed on an outer surface of the first end, the sixth through hole 153a and the seventh through hole both extend in a direction perpendicular to an axis of the second through hole 151, and the first fastening member is respectively engaged with the sixth through hole 153a and the seventh through hole; one surface of the third support plate 130 facing away from the first support plate 110 is provided with a second protrusion 134, the fourth through hole 133 penetrates through the second protrusion 134, the second protrusion 134 is provided with an eighth through hole 134a, the outer surface of the third end is provided with a ninth through hole, the eighth through hole 134a and the ninth through hole both extend in a direction perpendicular to the axis of the fourth through hole 133, and the second fastening member 300 is respectively matched with the eighth through hole 134a and the ninth through hole. In this embodiment, the axes of the sixth and seventh through holes 153a and 134a are perpendicular to the axis of the second through hole 151, and the axes of the eighth and ninth through holes are perpendicular to the axis of the fourth through hole 133, so that the first and second support rods 160 are restricted from moving under the action of centrifugal force by the first and second fasteners 300, and the first and second support rods 160 are prevented from being separated from the support frame 100.

In an alternative embodiment, the preheating mechanism includes a plurality of rigid members for spacing the adjacent corrugated sealing sheets 200, the rigid members 200 are disposed between the adjacent corrugated sealing sheets 200 with a gap therebetween, and the first and second support rods 160 are slidably engaged with the rigid members. In this embodiment, when the drive mechanism drives the preheating mechanism to rotate, the rigid member slides under the action of centrifugal force, and easily hits the corrugated sealing sheet 200 during sliding, so that the corrugated sealing sheet 200 is easily damaged. Therefore, in another embodiment, the preheating mechanism may further include a plurality of elastic members 400, and the elastic members 400 are in contact with the corrugated sealing sheet 200. In this embodiment, when the rotation speed of the preheating mechanism is increased, the centrifugal force to which the corrugated sealing sheet 200 is subjected is also increased, and at the same time, the elastic member 400 is subjected to a force that is compressed, and therefore, the corrugated sealing sheet 200 can be moved in a direction away from the rotation center; when reducing the rotational speed of preheating mechanism, the centrifugal force that corrugated sealing piece 200 received also reduces, and the pressure that elastic component 400 received also reduces simultaneously, under its restoring force effect, resumes the deformation gradually to drive corrugated sealing piece 200 and remove towards the direction that is close to the center of rotation, so corrugated sealing piece 200 can carry out reciprocating motion, thereby can shake off the dust that gathers on corrugated sealing piece 200. And the corrugated sealing piece 200 is always in contact with the elastic member 400 when sliding, so that impact between the corrugated sealing piece 200 and the elastic member 400 does not occur, thereby being advantageous to protect the corrugated sealing piece 200 from being damaged. After the air preheating apparatus stops operating, the corrugated sealing sheet 200 may return to the original position by the restoring force of the elastic member 400. Alternatively, the elastic member 400 may be a spring, or may be another elastic member, which is not limited in this embodiment.

In one embodiment, after the corrugated sealing sheets 200 are assembled on the supporting frame 100, the operator cannot adjust the distance between the adjacent corrugated sealing sheets 200, so that the distance between the adjacent corrugated sealing sheets 200 cannot be changed according to different combustion conditions of the boiler. To solve this problem, the preheating mechanism may further include an extrusion member 500, the extrusion member 500 being located in the accommodation space 101, the first and second support bars 160 each being slidably fitted with the extrusion member 500, one end of the extrusion member 500 being in contact with the corrugated sealing piece 200; with the compression member 500 sliding, the compression member 500 drives at least a portion of the corrugated sealing sheet 200 to move. In this embodiment, at least a portion of the corrugated sealing sheets 200 can be driven to move by sliding the pressing member 500, so that the distance between adjacent corrugated sealing sheets 200 can be changed, which is beneficial for the preheating mechanism to deal with different combustion conditions of the boiler.

In an alternative embodiment, the extrusion 500 may be provided with a sliding track or a sliding slot, and the first and second support bars 160 may be provided with a sliding slot or a sliding track, the sliding slot being slidably engaged with the sliding track. In this embodiment, when the driving mechanism drives the preheating mechanism to rotate, the sliding chute and the sliding rail are kept relatively stationary by friction force, and when the centrifugal force applied to the extrusion piece 500 is greater than the friction force between the two, the extrusion piece 500 is easy to slide, so that the distance between the adjacent corrugated sealing sheets 200 cannot be ensured to be constant. Thus, in an alternative embodiment, the extrusion 500 is provided with threaded holes, and the first and second support bars 160 are each externally threaded at one end, and the first and second support bars 160 are each threadedly engaged with the extrusion 500. In this embodiment, the external thread may apply a force to the pressing member 500 in a direction opposite to the centrifugal force, in addition to applying a frictional force to the pressing member 500 to restrict the sliding thereof, so that the connection of the pressing member 500 to the first and second support bars 160 may be more reliable, and it may be ensured that the distance between the adjacent corrugated sealing pieces 200 is kept constant after being adjusted.

In one embodiment, the pressing member 500 may be a nut, the preheating mechanism may further include an auxiliary member 600, one end of the auxiliary member 600 is connected to the nut, the other end of the auxiliary member 600 is in contact with the corrugated sealing piece 200, the nut has a first length in the extending direction of the first and second support bars 160, the auxiliary member 600 has a second length, and the external thread has a third length, wherein the sum of the first length and the second length is less than or greater than the third length. In the case where the sum of the first length and the second length is less than the third length, a part of the corrugated sealing piece 200 is easily located on the external threads of the first support bar and the second support bar 160, and the external threads generate a large friction force to the sliding corrugated sealing piece 200, so that the part of the corrugated sealing piece 200 contacting the first support bar and the second support bar 160 is easily damaged; when the sum of the first length and the second length is greater than the third length, the distance between adjacent corrugated sealing sheets 200 is likely to be small, which is disadvantageous to air circulation. Therefore, in another embodiment, the sum of the first length and the second length is equal to the third length, in this case, on one hand, it is avoided that a portion of the corrugated sealing piece 200 is located on the external thread, so as to be beneficial to protecting the corrugated sealing piece 200 from being damaged by the external thread, and on the other hand, it is ensured that the distance between adjacent corrugated sealing pieces 200 is large, so as to be beneficial to air circulation. Optionally. The auxiliary member 600 may be a tubular member, and the first and second support rods 160 are sleeved with the tubular member, and a gap may be formed between the tubular member and the first and second support rods 160, so as to prevent the first and second support rods 160 from generating damping force to the tubular member, thereby facilitating the smooth sliding of the extrusion member 500. One end of the tubular member may be connected to the extrusion member 500 by welding, bonding, or the like, or may be connected to the extrusion member 500 by other methods, which is not limited in the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.