1. The utility model provides a kuppe, its characterized in that, includes hemisphere cover, mount pad and counter weight, hemisphere cover includes the face guard, the face guard encloses into the water conservancy diversion chamber, the mount pad includes: locate the mounting panel of water conservancy diversion chamber below, connect the mounting panel with the connecting piece of face guard, the counter weight install in on the connecting piece.

2. The pod of claim 1, further comprising a retaining plate disposed within the pod cavity, wherein the retaining plate and the mask define a top cavity, and wherein the connector is coupled to the retaining plate.

3. The air guide sleeve according to claim 2, wherein the connecting piece comprises a screw and a nut, a screw mounting hole penetrating through the fixing plate is formed in the fixing plate, one end of the screw is fixed on the mounting plate, the other end of the screw penetrates through the screw mounting hole, the end of the screw is fixed on the fixing plate through the nut, the counterweight is located between the nut and the fixing plate and sleeved on the screw, a mounting operation hole penetrating through the nut is formed in the face shield, and the position of the mounting operation hole corresponds to the position of the screw mounting hole.

4. The pod of claim 3, wherein the face shield is hemispherical, and wherein the plane of the attachment plate is parallel to the plane of the edge of the face shield.

5. The air guide sleeve as claimed in claim 4, wherein the number of the connecting pieces is n, n is a natural number greater than or equal to 2, the center of the mounting plate is provided with a circular hole penetrating through the mounting plate, the n groups of the connecting pieces are uniformly arranged around the axis of the circular hole, and the mounting plate is further provided with a plurality of mounting plate mounting holes arranged around the circular hole.

6. The air guide sleeve as claimed in claim 5, wherein the fixing plate has a lightening hole formed centrally therethrough, and a plurality of water leakage holes are uniformly distributed around the lightening hole, and the plurality of water leakage holes respectively penetrate through the edge of the fixing plate, and each of the water leakage holes is respectively communicated with the top cavity.

7. The fan for the air-assisted sprayer is characterized by comprising the air guide sleeve as claimed in any one of claims 1 to 6, the air-assisted sprayer further comprises an air duct assembly, a protective net and a fan unit, wherein an air inlet is formed in one side of the air duct assembly, the protective net is arranged on one side, close to the air inlet, of an inner cavity of the air duct, a containing cavity is formed by the protective net and the inner cavity of the air duct in a surrounding mode, the fan unit is arranged in the containing cavity and comprises a motor and fan blades arranged at one end, close to the air inlet, of the motor, and the air guide sleeve is fixed on one side, close to the air inlet, of the fan blades.

8. The fan for the air-assisted sprayer according to claim 7, wherein the motor comprises a main body and an output shaft, one end of the output shaft is positioned in the main body, the other end of the output shaft extends out of the main body, the fan blade comprises a mounting ring and a plurality of rotating blades annularly arranged on the mounting ring, a fan blade mounting hole penetrating through the mounting ring is arranged on the mounting ring, the fan blade mounting hole is sleeved on the output shaft, the fan unit further comprises a fan blade pressing plate simultaneously abutted against the mounting ring and one end of the output shaft far away from the main body, the fan unit further comprises a pressing bolt connecting the output shaft and the fan blade pressing plate, and the air deflector is fixed on the rotating blades.

9. The fan for the air-assisted sprayer according to claim 8, wherein the air duct assembly comprises an air duct main body and a current collector fixed at one end of the air duct main body, the air duct main body is cylindrical in shape as a whole, the current collector is conical in shape as a whole, the output shaft, the air duct main body and the current collecting cover are coaxially arranged, and the protective net is arranged in an inner cavity of the current collecting cover.

10. A method of mounting a fan for an air-assisted sprayer according to claim 8 or claim 9, comprising the steps of:

s1, mounting a mounting seat: mounting the mounting seat on the fan blade;

s2, installing a semispherical cover and a counterweight: adjusting the mass and distribution of the balance weight according to the control requirement of the dynamic balance amount; then the hemispherical cover is arranged on the mounting seat by utilizing the connecting piece, and the air guide cover and the fan blade in the state jointly form an air guide cover and a fan blade assembly;

s3, performing dynamic balance: carrying out dynamic balance test on the air guide sleeve and the air blade assembly to obtain the unbalance amount, and judging whether the unbalance amount meets the control requirement of the dynamic balance amount;

if yes, directly carrying out the next operation;

if the unbalance amount does not meet the control requirement of the dynamic balance amount, readjusting the mass and the distribution of the balance weight until the unbalance amount meets the control requirement of the dynamic balance amount, and then performing the next operation;

s4, assembling: and detaching the flow guide cover meeting the balance control requirement and the balance weight and the hemispherical cover in the air vane assembly, assembling the fan vane and the mounting seat on the motor together, assembling a fan vane pressing plate and a pressing bolt, and finally assembling the balance weight and the hemispherical cover back in situ.

Background

The fan of the air-assisted sprayer is a core component of the sprayer, and generally comprises an air duct, a motor, fan blades, a protective screen, a flow guide cover and a current collector. The air guide sleeve and the collector are positioned at the air inlet of the air duct, wherein the shape and the installation position of the air guide sleeve have certain influence on the noise and the flow of the fan.

The air guide sleeve of the existing air-assisted sprayer is generally arranged at the central position of a protective net at the rear end of an air duct or is not provided with the air guide sleeve. When the air guide sleeve is arranged at the central position of the protective net at the rear end of the air duct, a certain gap is formed between the air guide sleeve and the fan blade, and the fan blade is easy to generate vortex at the root part of the blade when rotating, so that larger noise is generated. In addition, when the air guide sleeve is not installed, airflow enters from the tail end of the fan blade without flow guide because the center of the tail end of the fan blade is a plane, and certain influence is exerted on the improvement of airflow flow.

Disclosure of Invention

Technical problem to be solved

Based on the above, the invention provides a flow guide cover, a fan for an air-assisted sprayer and an installation method of the fan, and aims to solve the technical problem that in the existing air-assisted sprayer in the prior art, gaps between the flow guide cover and fan blades cause the fan blades to easily generate vortexes at blade root parts when the fan blades rotate, and influence is caused on noise and airflow flow.

(II) technical scheme

In order to solve the technical problem, the invention provides a dome, which comprises a hemispherical cover, a mounting seat and a counterweight, wherein the hemispherical cover comprises a face mask, the face mask encloses a flow guide cavity, and the mounting seat comprises: locate the mounting panel of water conservancy diversion chamber below, connect the mounting panel with the connecting piece of face guard, the counter weight install in on the connecting piece.

Preferably, the hemispherical cover further comprises a fixing plate arranged in the flow guide cavity, the fixing plate and the face mask enclose a top cavity, and the connecting piece is connected with the fixing plate.

Preferably, the connecting piece includes screw rod and nut, be equipped with the screw rod mounting hole that runs through on it on the fixed plate, the one end of screw rod is fixed in on the mounting panel, the other end of screw rod runs through the screw rod mounting hole, and uses the nut will the screw rod tip is fixed in on the fixed plate, the counter weight is located the nut with between the fixed plate, just the counter weight cover is located on the screw rod, be equipped with the installation handle hole that runs through on it on the face guard, the position of installation handle hole with the position of screw rod mounting hole corresponds.

Preferably, the face guard is hemispherical, and the plane that the fixed plate is located is parallel to the plane that the edge of face guard is located.

Preferably, the number of the connecting pieces is n, n is a natural number larger than or equal to 2, a circular hole penetrating through the mounting plate is formed in the center of the mounting plate, the n groups of the connecting pieces are uniformly arranged around the axis of the circular hole, and the mounting plate is further provided with a plurality of mounting plate mounting holes arranged around the circular hole.

Preferably, the center of the fixing plate is provided with a lightening hole penetrating through the fixing plate, a plurality of water leakage holes are uniformly distributed around the lightening hole, the plurality of water leakage holes respectively penetrate through the edge of the fixing plate, and each water leakage hole is respectively communicated with the top cavity.

The invention also provides a fan for the air-assisted sprayer, which comprises the air guide cover, and further comprises an air duct assembly, a protective net and a fan unit, wherein an air inlet is formed in one side of the air duct assembly, the protective net is arranged on one side, close to the air inlet, of an inner cavity of the air duct, the protective net and the inner cavity of the air duct enclose a containing cavity, the fan unit is arranged in the containing cavity, the fan unit comprises a motor and a fan blade arranged at one end, close to the air inlet, of the motor, and the air guide cover is fixed on one side, close to the air inlet, of the fan blade.

Preferably, the motor comprises a machine main body and an output shaft, one end of the output shaft is located in the machine main body, the other end of the output shaft extends out of the machine main body, the fan blade comprises a mounting ring and a plurality of rotating blades arranged on the mounting ring, a fan blade mounting hole penetrating through the mounting ring is formed in the mounting ring, the fan blade mounting hole is arranged on the output shaft in a sleeved mode, the fan unit further comprises a fan blade pressing plate which is abutted to the mounting ring and the output shaft and is far away from one end of the machine main body, the fan unit further comprises a pressing bolt which is connected with the output shaft and the fan blade pressing plate, and the flow guide cover is fixed on the rotating blades.

Preferably, the air duct assembly comprises an air duct main body and a current collector fixed at one end of the air duct main body, the air duct main body is cylindrical, the current collector is conical, the output shaft, the air duct main body and the current collecting cover are coaxially arranged, and the protective screen is arranged in an inner cavity of the current collecting cover.

The invention also discloses an installation method of the fan for the air-assisted sprayer, which comprises the following steps:

s1, mounting a mounting seat: mounting the mounting seat on the fan blade;

s2, installing a semispherical cover and a counterweight: adjusting the mass and distribution of the balance weight according to the control requirement of the dynamic balance amount; then the hemispherical cover is arranged on the mounting seat by utilizing the connecting piece, and the air guide cover and the fan blade in the state jointly form an air guide cover and a fan blade assembly;

s3, performing dynamic balance: carrying out dynamic balance test on the air guide sleeve and the air blade assembly to obtain the unbalance amount, and judging whether the unbalance amount meets the control requirement of the dynamic balance amount;

if yes, directly carrying out the next operation;

if the unbalance amount does not meet the control requirement of the dynamic balance amount, readjusting the mass and the distribution of the balance weight until the unbalance amount meets the control requirement of the dynamic balance amount, and then performing the next operation;

s4, assembling: and detaching the flow guide cover meeting the balance control requirement and the balance weight and the hemispherical cover in the air vane assembly, assembling the fan vane and the mounting seat on the motor together, assembling a fan vane pressing plate and a pressing bolt, and finally assembling the balance weight and the hemispherical cover back in situ.

(III) advantageous effects

Compared with the prior art, the air guide sleeve, the fan for the air-assisted sprayer and the installation method thereof have the beneficial effects that:

according to the fan for the air-assisted sprayer, the structure and the installation mode of the air guide sleeve are improved, the edge of the air guide sleeve is close to the root of the fan blade, namely, the airflow is guided by the hemispherical air guide sleeve and then can directly flow into the fan blade, the generation of vortex at the root of the fan blade is avoided, the flow of the fan can be improved, and the noise of the fan can be reduced.

By applying the method for mounting the fan of the air-assisted sprayer, disclosed by the invention, the dynamic balance unbalance of the air guide sleeve can be controlled within a small range, and the unfavorable vibration and noise of the fan are avoided.

Drawings

The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:

fig. 1 is a schematic overall structural view of an air-assisted sprayer according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a pod according to an embodiment of the present invention;

FIG. 3 is a perspective view of the overall construction of the pod of an embodiment of the present invention;

FIG. 4 is a partially cut away perspective view of a pod embodying the present invention

FIG. 5 is an exploded view of a pod according to an embodiment of the present invention;

FIG. 6 is a perspective view of one orientation of a hemispherical dome in an air guide sleeve according to an embodiment of the present invention;

FIG. 7 is a perspective view of another orientation of the hemispherical dome in the pod of an embodiment of the present invention;

FIG. 8 is a top view of a hemispherical dome in an airflow guide housing according to an embodiment of the present invention;

fig. 9 is a partially enlarged view of a portion a in fig. 1.

Description of reference numerals:

1. the fan comprises a flow guide cover, a wind cylinder assembly, a protective screen, a fan unit, a containing cavity, a semi-spherical cover, a mounting seat, a nut, a balance weight, a 111 mask, a fixing plate, a top cavity, a screw rod, a mounting plate, a mounting operation hole, a water leakage hole, a weight reduction hole, a screw rod mounting hole 1123, a shaft shoulder 1211, a thread 1212, a mounting plate mounting hole 1221, a circular hole 1222, a circular hole 20, an air inlet, a wind cylinder body 21, a current collector 22, a motor 41, a fan blade 42, a fan blade pressing plate 43, a compression bolt 44, a motor body 411, an output shaft 412, a 421 mounting ring and a rotating blade 5.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or connected through the inside of the two elements, or "in transmission connection", that is, connected in a power manner through various suitable manners such as belt transmission, gear transmission, or sprocket transmission. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention will be further described with reference to the accompanying figures 1-9.

Referring to fig. 2-4, a fairwater hood 1 includes a hemispherical hood 11, a mounting seat 12 and a counterweight 14, the hemispherical hood 11 includes a face mask 111, the face mask 111 encloses a flow guiding cavity, the mounting seat 12 includes: the mounting plate 122 is arranged below the diversion cavity, and the connecting piece is used for connecting the mounting plate 122 and the mask 111, and the counterweight 14 is arranged on the connecting piece.

In the present embodiment, the nacelle 1 is made as a separate structure, and can be directly mounted on the fan blade 42, and installation interference can be avoided. The edge of the air guide sleeve 1 is close to the root of the fan blade 42, namely, the air flow can directly flow into the fan blade 42 after being guided by the hemispherical air guide sleeve 1, so that the vortex is prevented from being generated at the root of the fan blade 42, and the noise and the flow influence can be avoided. The structure and the installation mode of the air guide sleeve 1 are improved, the flow of the fan can be improved, and the noise of the fan can be reduced.

Referring to fig. 5-8, according to the embodiment of the present invention, the hemispherical cap 11 further includes a fixing plate 112 disposed in the flow guiding cavity, the fixing plate 112 and the face mask 111 define a top cavity 113, and the connecting member is connected to the fixing plate 112. In this embodiment, the fixing plate 112 is used to facilitate the connection between the mask 111 and the mounting plate 122.

According to the embodiment of the invention, the connecting member comprises a screw 121 and a nut 13, a screw mounting hole 1123 is formed on the fixing plate 112 and penetrates therethrough, one end of the screw 121 is fixed on the mounting plate 122, the other end of the screw 121 penetrates through the screw mounting hole 1123, the end of the screw 121 is fixed on the fixing plate 112 by the nut 13, the counterweight 14 is positioned between the nut 13 and the fixing plate 112, the counterweight 14 is sleeved on the screw 121, a mounting operation hole 1111 penetrates therethrough is formed on the face mask 111, and the mounting operation hole 1111 corresponds to the screw mounting hole 1123.

More specifically, the screw 121 is disposed perpendicular to the mounting plate 122, and the screw 121 is welded to the mounting plate 122. The fixing plate 112 is welded to the mask 111, and in this embodiment, the mounting hole 1111 is used for a tool to be inserted into the top cavity 113 to mount the nut 13. The size of the installation operation hole 1111 should be larger than the size necessary for the operation tool when the nut 13 is installed.

According to the embodiment of the present invention, the face mask 111 has a hemispherical shape, and the plane of the fixing plate 112 is parallel to the plane of the edge of the face mask 111. In this embodiment, with this structure, the edge of the nacelle 1 can be closer to the root of the blade 42.

According to the embodiment of the present invention, the number of the connecting members is n, n is a natural number greater than or equal to 2, the center of the mounting plate 122 is provided with a circular hole 1222 penetrating through the center, the n groups of connecting members are uniformly arranged around the axis of the circular hole 1222, and the mounting plate 122 is further provided with a plurality of mounting plate mounting holes 1221 arranged around the circular hole 1222.

More specifically, the number of the connecting pieces is 4, the number of the screws 121 is four, the four screws 121 are uniformly distributed relative to the center of the circular hole 1222 of the mounting plate 122, one end of each screw 121 is welded with the mounting plate 122, a shaft shoulder 1211 is arranged at one end of each screw 121, and a thread 1212 which is matched with the thread 1212 is arranged at one end of each screw 121 close to the shaft shoulder 1211. When installed, shoulder 1211 abuts the lower portion of stationary plate 112.

More specifically, the number of the mounting plate mounting holes 1221 is 4, and the 4 mounting plate mounting holes 1221 are uniformly arranged around the axis of the circular hole 1222. During specific implementation, the number and the positions of the mounting plate mounting holes 1221 are correspondingly arranged according to the number and the positions of the fan blades 42. The number of the mounting plate mounting holes 1221 is not necessarily the same as the number of the fan blades 42, but each mounting plate mounting hole 1221 needs to be arranged corresponding to one fan blade 42, so that a mounting position is provided for the mounting plate 122.

More specifically, the weight 14 is a washer, and the weight 14 may also be other annular sheet-like structures.

In the present embodiment, the circular hole 1222 allows weight reduction and avoids interference with the fan blade 42, the fan blade pressure plate 43, and other structures. The hemispherical cover 11 is fitted to the mount 12 and fixed by a nut 13, and a weight 14 is installed between the nut 13 and the hemispherical cover 11. When the hemispherical cap 11 is assembled with the mounting seat 12, the screw mounting hole 1123 of the hemispherical cap 11 is aligned with the screw 121, the screw 121 extends into the screw mounting hole 1123 until one side of the fixing plate 112 contacts and abuts against the shoulder 1211 of the screw 121, at this time, the hemispherical cap 11 and the mounting seat 12 are relatively limited, then the counterweight 14 is assembled on the screw 121, finally, the nut 13 is screwed on the thread 1212 at the end of the screw 121, the hemispherical cap 11 or the counterweight 14 is pressed, and at this time, the hemispherical cap 11 and the mounting seat 12 are firmly fixed together.

According to the embodiment of the present invention, a lightening hole 1122 is formed through the center of the fixing plate 112, a plurality of water leakage holes 1121 are uniformly distributed around the lightening hole 1122, the plurality of water leakage holes 1121 respectively penetrate through the edge of the fixing plate 112, and each water leakage hole 1121 is respectively communicated with the top cavity 113.

More specifically, the screw mounting hole 1123 is located between the edge of the fixing plate 112 and the lightening hole 1122 at a position corresponding to the position of the screw 121 on the mounting seat 12. The water leakage holes 1121 are 4 semicircular holes, and the screw mounting holes 1123 are 4 circular holes 1222.

In this embodiment, the fixing plate 112 and the face mask 111 enclose a top cavity 113, if rainwater enters the top cavity 113 from the installation operation hole 1111 of the face mask 111, the rainwater can flow to the outside from the water leakage hole 1121, and by setting the water leakage hole 1121, the influence of rusting and the like caused by uneven mass distribution of the air guide sleeve 1 and long-term water storage can be avoided. The water leakage hole 1121 is formed at the edge of the fixing plate 112, so that water in the top cavity 113 can flow out completely, and residues are avoided.

It should be noted that: in the above embodiment, the number of the screws 121, the mounting plate mounting holes 1221, the water leakage holes 1121, the mounting operation holes 1111, the screw mounting holes 1123, etc. is not necessarily 4, but is not less than 2 as long as they are ensured to be corresponding and uniformly distributed, and the number and shape of the holes should be changed as a modification of the present invention, and the present invention is within the protection scope of the present invention.

Please refer to fig. 1 and 9, the present invention further discloses a fan for an air-assisted sprayer, which includes the above-mentioned air guide sleeve 1, the air-assisted sprayer further includes an air duct assembly 2, a protective screen 3 and a fan unit 4, one side of the air duct assembly 2 is an air inlet 20, the protective screen 3 is disposed at one side of the air duct inner cavity close to the air inlet 20, the protective screen 3 and the air duct inner cavity form an accommodating cavity 5, the fan unit 4 is mounted in the accommodating cavity 5, the fan unit 4 includes a motor 41 and a fan blade 42 disposed at one end of the motor 41 close to the air inlet 20, and the air guide sleeve 1 is fixed at one side of the fan blade 42 close to the air inlet 20.

Further, the motor 41 includes a main body 411 and an output shaft 412, one end of the output shaft 412 is located in the main body 411, the other end of the output shaft 412 extends out of the main body 411, the fan blade 42 includes a mounting ring 421 and a plurality of rotating blades 422 annularly arranged on the mounting ring 421, a fan blade mounting hole penetrating through the mounting ring 421 is formed in the mounting ring 421, the fan blade mounting hole is sleeved on the output shaft 412, the fan unit 4 further includes a fan blade pressing plate 43 simultaneously abutted to the mounting ring 421 and the output shaft 412 and far away from one end of the main body 411, the fan unit 4 further includes a pressing bolt 44 connecting the output shaft 412 and the fan blade pressing plate 43, and the air guide sleeve 1 is fixed on the rotating blades 422.

Further, the air duct assembly 2 comprises an air duct main body 21 and a current collector 22 fixed at one end of the air duct main body 21, the air duct main body 21 is cylindrical, the current collector 22 is conical, the output shaft 412, the air duct main body 21 and the current collecting cover are coaxially arranged, and the protective screen 3 is arranged in an inner cavity of the current collecting cover.

In the above embodiment, the protective net 3 and the inner cavity of the air duct form the accommodating cavity 5, the fan unit 4 is installed in the accommodating cavity 5, the motor 41 is installed at the central position of the middle part of the air duct, the fan blade 42 is installed on the motor 41, the air guide sleeve 1 is installed on the fan blade 42 on one side close to the air inlet 20, the current collector 22 is located at the air inlet 20 of the air duct and is integrated with the air duct, the protective net 3 is located at the air inlet 20, and the fan blade 42 is located in the cavity formed by the protective net 3 and the air duct. The air guide sleeve 1 is fixed on the fan blade 42. This structure and mounting means are different from prior art's scheme completely, can make the edge of kuppe 1 press close to fan blade 42 root, and the air current can directly flow in fan blade 42 after the 1 water conservancy diversion of hemispherical kuppe, avoids producing the swirl at fan blade 42 root, can improve fan flow, can reduce the fan noise.

The invention also discloses an installation method of the fan for the air-assisted sprayer, which comprises the following steps:

s1, mounting the mount 12: the mounting base 12 is mounted on the fan blade 42.

S2, mounting the hemispherical cover 11 and the counterweight 14: adjusting the mass and distribution of the counterweight 14 according to the control requirement of the dynamic balance amount; and then the semispherical cover 11 is arranged on the mounting seat 12 by using a connecting piece, and the air guide cover 1 and the fan blade 42 in the state jointly form an air guide cover and fan blade combination.

S3, performing dynamic balance: and carrying out dynamic balance test on the air guide sleeve and the air vane combination to obtain the unbalance, and judging whether the unbalance meets the control requirement of the dynamic balance.

If so, directly carrying out the next operation.

If the unbalance amount does not meet the control requirement of the dynamic balance amount, the mass and the distribution of the balance weight 14 are readjusted until the unbalance amount meets the control requirement of the dynamic balance amount, and then the next operation is carried out.

S4, assembling: the balance weight 14 and the hemispherical cover 11 in the air guide sleeve and the air vane combination meeting the balance control requirement are disassembled, the air vane 42 and the mounting seat 12 are assembled on the motor 41 together, the air vane pressing plate 43 and the pressing bolt 44 are assembled, and finally the balance weight 14 and the hemispherical cover 11 are assembled in situ.

More specifically: in step S2, the control requirement for the dynamic balance amount is: the unbalance amount is controlled within 1 g.

More specifically: in steps S2 and S3, the adjusting the mass and the distribution of the counterweight 14 specifically means: the weight 14 itself is adjusted by selecting weights 14 (e.g., shims) of different thicknesses, and the distribution of the weights 14 is adjusted by adjusting the position of the shims on the plurality of screws 121.

The inventive principles of the present invention are further illustrated below:

because the fan blade 42 is generally formed by die casting aluminum alloy and has an industry standard specification, which is mostly an industry standard component, if a structure that the guide cover 1 is additionally arranged on the fan blade 42 is adopted, the guide cover 1 can be correspondingly designed only according to the original structure of the fan blade 42. The fan blades 42 are parts rotating at high speed, and need to be dynamically balanced before being assembled on the motor 41, so that the unbalance amount is controlled in a small range (generally not exceeding 1 g). If the air guide sleeve 1 is directly assembled on the fan blades 42, the original mass distribution of the fan blades 42 can be damaged, and the dynamic balance quantity is influenced. Therefore, after the fan blade 42 and the air guide sleeve 1 are assembled into an assembly, dynamic balance needs to be firstly performed, the dynamic balance amount is controlled within 1g, and then the assembly is assembled with the motor 41.

After the fan blade 42 is assembled with the motor 41, the fan blade 42 needs to be limited by a fan blade pressure plate 43 and a pressure bolt 44. As shown in fig. 9, the clearance between the blade 42 and the nacelle 1 is very small, and the blade pressure plate 43 and the hold-down bolt 44 cannot be mounted when the nacelle 1 is in a combined state. Therefore, the dome cover 11 and the mounting seat 12 of the nacelle 1 need to be formed as a separate structure.

In this embodiment, after the fan blades 42 and the nacelle 1 are assembled into an assembly, dynamic balance is first performed, and according to the amount of unbalance, after appropriate counterweights 14 are added to some screws 121 of the mounting base 12, the amount of unbalance is controlled within 1 g. When the fan blade 42 is assembled with the motor 41, the balance weight 14 and the hemispherical cover 11 are detached, the fan blade 42 is assembled on the motor 41, the fan blade pressing plate 43 and the pressing bolt 44 are assembled, and finally the balance weight 14 and the hemispherical cover 11 are assembled in situ to complete the assembly of the air guide sleeve 1.

By adopting the method, after the air guide sleeve 1 is assembled on the fan blade 42, the dynamic balance unbalance can be ensured to meet the requirement.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.