1. A heat exchange plate for a plate heat exchanger is characterized in that a plurality of valleys arranged at intervals are arranged on the heat exchange plate, the valleys comprise an inlet valley, at least one middle valley and an outlet valley, the heat exchange plate is sequentially divided into a plurality of heat exchange areas distributed along the length direction of the heat exchange plate by the valleys, the heat exchange plate comprises an inlet heat exchange area, at least two middle heat exchange areas with even number and an outlet heat exchange area, and each heat exchange area is provided with raised corrugations;

the raised corrugation directions of two adjacent intermediate heat exchange regions are opposite, and the heat exchange areas are equal or close.

2. A heat exchange plate for a plate heat exchanger according to claim 1, wherein the middle valley is formed by seamlessly splicing two circular arcs, the concave-convex directions of the two circular arcs are opposite, the diameters of circles where the two circular arcs are located are the same, the two circular arcs are respectively located on two sides of a middle dividing line of the heat exchange plate along the length direction, and the middle points of the two circular arcs are equidistant to the middle dividing line;

the inlet valley and the outlet valley are both circular arcs, and the concave-convex directions of the inlet valley and the outlet valley are opposite;

all the middle valleys have the same shape and structure.

3. A heat exchanger plate for a plate heat exchanger according to claim 1, wherein the width of the valleys is 3-6 times the depth of the raised corrugations, the depth of the valleys being equal or similar to the depth of the raised corrugations.

4. A heat exchanger plate for a plate heat exchanger according to claim 1, wherein at least four portholes are provided at four corners of the heat exchanger plate, and wherein two of the portholes are provided as inlets of the heat exchanger plate in the inlet heat exchange area and two other portholes are provided as outlets of the heat exchanger plate in the outlet heat exchange area.

5. A heat exchanger plate for a plate heat exchanger according to claim 1, wherein a number of protrusions are arranged on the centre line of the valley bottom.

6. A heat exchanger plate for a plate heat exchanger according to claim 1, wherein the valleys extend approximately across the width of the heat exchanger plate, and both end points of each valley are equally divided points of the heat exchanger plate along the length direction, respectively;

the number of the middle valleys is odd, and the central point of the most middle valley along the length direction is approximate to the central point of the heat exchange plate.

7. A heat exchanger plate for a plate heat exchanger according to claim 4, wherein the distance between the two middle points of the two arcs in the middle valley and the center point of one of the outlets/inlets is the same, and a circle can be formed by taking the center point of one of the outlets/inlets as a circular point and the two middle points of the two arcs in the middle valley as an arc point.

8. A heat exchanger plate for a plate heat exchanger according to claim 1 or 6, wherein the middle points of the arcs of the inlet valley and the outlet valley are both located on a middle dividing line of the heat exchanger plate in the width direction.

9. The utility model provides a plate heat exchanger which characterized in that, it is including the upper end plate, two at least heat transfer boards and the lower end plate that stack gradually, adjacent two form the runner between the corresponding valley between the heat transfer board, wherein adjacent two form the entry runner between the corresponding entry valley between the heat transfer board, adjacent two form middle runner between the corresponding middle valley between the heat transfer board, adjacent two form the export runner between the corresponding export valley between the heat transfer board, adjacent communicate between runner and the heat transfer region for the medium circulation.

Wherein at least two adjacent heat exchanger plates are heat exchanger plates according to any of claims 1-8.

10. A plate heat exchanger according to claim 9, wherein for any one of the flow channels, the protrusions of two adjacent heat exchange plates abut against each other when stacked to enhance the rigidity of the flow channel, or the protrusions of one of the two adjacent heat exchange plates abut against the valleys of the other heat exchange plate when stacked to enhance the rigidity of the flow channel.

Background

The plate heat exchanger is used for instant sterilization of fresh milk and cooling of milk products in the dairy industry, can also be used for heating and cooling in industries such as fruit juice, tea drinks, vinegar, wine, soy sauce and the like in large quantity, and is the most ideal sterilization and heat exchange equipment in the food industry.

Wherein the food sterilization mainly adopts pasteurization. The pasteurization method mainly comprises two methods: the first is to heat the milk to 62-65 deg.C for 30 min. By adopting the method, various growth-type pathogenic bacteria in the milk can be killed, the sterilization efficiency can reach 97.3-99.9%, only partial thermophilic bacteria, heat-resistant bacteria, spores and the like are remained after sterilization, but most of the bacteria are lactic acid bacteria which are not harmful to human bodies but are beneficial to health; the second method heats the milk to 75-90 ℃, keeps the temperature for 15-16 s, and has shorter sterilization time and higher working efficiency. However, the basic principle of sterilization is that pathogenic bacteria can be killed, and the temperature is too high, so that more nutrition is lost.

The existing plate heat exchanger plates are mainly in herringbone or W-shaped. When the heat exchanger is wide and the medium flows into the heat exchange flow channel from the plate corner hole, the medium cannot be uniformly distributed on the heat exchange plate surface, so that the temperature uniformity of the medium is poor, the temperature of one part of the medium exceeds the sterilization temperature, and the temperature of the other part of the medium does not reach the sterilization temperature. Finally, part of the nutrient in the food medium is lost due to overhigh temperature, and part of the nutrient is not completely sterilized due to overlow temperature.

Disclosure of Invention

To achieve these objects and other advantages in accordance with the present invention, there is provided a heat exchange plate for a plate heat exchanger, wherein a plurality of valleys are disposed at intervals, the valleys include an inlet valley, at least one intermediate valley and an outlet valley, the heat exchange plate is sequentially divided into a plurality of heat exchange regions distributed along a length direction of the heat exchange plate by the valleys, the heat exchange regions include an inlet heat exchange region, at least two intermediate heat exchange regions with even number, and an outlet heat exchange region, each of the heat exchange regions is provided with raised corrugations;

the raised corrugation directions of two adjacent intermediate heat exchange regions are opposite, and the heat exchange areas are equal or close.

According to a preferred embodiment of the present invention, the middle valley is formed by seamlessly splicing two arcs, the concave-convex directions of the two arcs are opposite, the diameters of the circles where the two arcs are located are the same, the two arcs are respectively located on two sides of a middle dividing line of the heat exchange plate along the length direction, and the middle point of the two arcs is equidistant to the middle dividing line;

the inlet valley and the outlet valley are both circular arcs, and the concave-convex directions of the inlet valley and the outlet valley are opposite;

all the middle valleys have the same shape and structure.

According to a preferred embodiment of the present invention, the width of the valleys is 3-6 times the depth of the raised corrugations, and the depth of the valleys is equal to or similar to the depth of the raised corrugations.

According to a preferred embodiment of the present invention, at least four orifices are disposed at four corners of the heat exchange plate, and two orifices are used as inlets of the heat exchange plate and located in the inlet heat exchange region, and the other two orifices are used as outlets of the heat exchange plate and located in the outlet heat exchange region.

According to a preferred embodiment of the present invention, a plurality of protrusions are provided on a center line of the valley bottom.

According to a preferred embodiment of the present invention, the valleys penetrate approximately along the width direction of the heat exchange plate, and two end points of each valley are equally divided points along the length direction of the heat exchange plate;

the number of the middle valleys is odd, and the central point of the most middle valley along the length direction is approximate to the central point of the heat exchange plate.

According to a preferred embodiment of the present invention, the distance between the two middle points of the two circular arcs in the middle valley and the center point of one of the outlets/inlets is the same, and a circle can be formed by using the center point of one of the outlets/inlets as a circular point and using the two middle points of the two circular arcs in the middle valley as an arc point.

According to a preferred embodiment of the present invention, the middle points of the arcs of the inlet valley and the outlet valley are located on the middle dividing line of the heat exchange plate in the width direction.

Another embodiment provides a plate heat exchanger, which includes an upper end plate, at least two heat exchange plates and a lower end plate stacked in sequence, a flow channel is formed between corresponding valleys between two adjacent heat exchange plates, an inlet flow channel is formed between corresponding inlet valleys between two adjacent heat exchange plates, an intermediate flow channel is formed between corresponding intermediate valleys between two adjacent heat exchange plates, an outlet flow channel is formed between corresponding outlet valleys between two adjacent heat exchange plates, and the flow channel and the heat exchange area are communicated with each other for medium circulation.

Wherein at least two adjacent heat exchanger plates are heat exchanger plates according to any of claims 1-7.

According to a preferred embodiment of the present invention, for any one of the flow channels, when two adjacent heat exchange plates are stacked, the protrusions corresponding to the flow channel are abutted to each other to enhance the rigidity of the flow channel, or when one of the two adjacent heat exchange plates is provided with a protrusion, and the other is not provided with a protrusion, when the two heat exchange plates are stacked, the protrusion abuts against the valley of the other heat exchange plate to enhance the rigidity of the flow channel.

The invention at least comprises the following beneficial effects: according to the invention, the flow channel is formed between the adjacent heat exchange plates, so that the medium is uniformly distributed on the heat exchange plate surface when passing through the heat exchange area, the flow and the flow speed of the medium at each part are basically the same, the temperature uniformity of the medium is improved, and the pressure drop of the medium is reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic view of a single heat exchange plate according to the present invention.

Fig. 2 is a schematic structural view of the overlapping of two adjacent heat exchange plates in the invention.

Fig. 3 is a schematic view of a plurality of bosses according to the present invention when stacked.

Fig. 4 is a schematic view of a plurality of bosses according to the present invention when stacked.

Fig. 5 is a schematic structural view of a middle valley in the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

As shown in fig. 1 to 5, a preferred embodiment of the present invention provides a heat exchange plate 1 for a plate heat exchanger, as known to those skilled in the art, the plate heat exchanger includes an upper end plate, at least two heat exchange plates 1 and a lower end plate stacked in sequence, wherein two adjacent heat exchange plates 1 are stacked in 180 ° opposite direction, the heat exchange plates are provided with a plurality of valleys 234 arranged at intervals, and the heat exchange plates are sequentially divided into a plurality of heat exchange areas distributed along the length direction of the heat exchange plates by the plurality of valleys; in this way, a flow channel is formed between the corresponding valleys 234 between two adjacent heat exchange plates 1 for the medium to flow, and the corresponding heat exchange areas of two adjacent heat exchange plates 1 cover to form a relatively sealed heat exchange area, where the relatively sealed heat exchange area is formed by sealing the two sides of the heat exchange plate along the height direction thereof, so that the medium can only move laterally in the heat exchange area between two adjacent heat exchange plates 1.

In the above embodiment, a flow channel is formed between adjacent heat exchange plates, and when a medium flows in the flow channel of the heat exchange plate 1, the corrugations on the heat exchange plate 1 exert a great resistance on the medium. The flow of the medium flowing between the inlet angle hole and the outlet angle hole of the heat exchange plate 1 at the near end is short, and the pressure drop of the medium is smaller than that of the medium at the far end. As the media flows into the valleys 234, the proximal media pressure is higher than the distal media pressure. While the flow resistance of the media in the valleys 234 is relatively low, the proximal media can flow within the valleys 234 to the distal end, which distributes the media evenly to the next heat exchange panel. Therefore, the flow and the flow speed of the medium at each position are basically the same, the temperature uniformity of the medium is improved, and the pressure drop of the medium is reduced.

It should be noted that the number of the valleys 234 may be adjusted according to actual conditions, but the number of the valleys 234 is a base number, so that it can be ensured that one of the valleys 234 in the middle is relatively located at a transverse middle position of the heat exchange plate 1 along the length direction, and each of the valleys 234 approximately penetrates along the width direction of the heat exchange plate 1, so that it can be ensured that all media must pass through the flow channel to enter the adjacent heat exchange area, and it is ensured that the flow uniformly disperses all the media, thereby avoiding missing the media.

Wherein the valleys 234 include an inlet valley 2, a base number bar middle valley 3 and an outlet valley 4, the following provides a case including 3 valleys specifically: the heat exchange plate comprises an inlet valley 2, a middle valley 3 and an outlet valley 4, wherein the inlet valley 2 corresponding to each two adjacent heat exchange plates 1 is spliced to form an inlet flow channel, the middle valley 3 corresponding to each two adjacent heat exchange plates 1 is spliced to form a middle flow channel, the outlet valley 4 corresponding to each two adjacent heat exchange plates is spliced to form an outlet flow channel, and the adjacent flow channels are communicated with the heat exchange areas to allow a medium to transversely flow.

The following specifically discloses a condition that a heat exchange plate 1 only comprises an inlet valley 2, a middle valley 3 and an outlet valley 4, the heat exchange plate 1 is sequentially divided into 4 heat exchange areas distributed along the length direction of the heat exchange plate by the inlet valley 2, the middle valley 3 and the outlet valley 4, the heat exchange plate comprises an inlet heat exchange area 5, two middle heat exchange areas (a left middle heat exchange area 6A, a right middle heat exchange area 6B) and an outlet heat exchange area 7, and each heat exchange area is provided with raised corrugations; flow path of the medium: an inlet heat exchange area 5, an inlet flow channel (corresponding to the position of the inlet valley 2, which is formed by splicing two inlet valleys 2 of two heat exchange plates), a left middle heat exchange area 6A, a middle flow channel (corresponding to the position of the middle valley 3, which is formed by splicing two middle valleys 3 of two heat exchange plates 1), a right middle heat exchange area 6B, and an outlet flow channel (corresponding to the position of the outlet valley 4, which is formed by splicing two outlet valleys 4 of two heat exchange plates 1).

The convex corrugation directions of two adjacent middle heat exchange regions 6 are opposite, and the heat exchange areas are equal or close. The heat exchange areas are preferably equal or close to each other, so that the temperature rise or the temperature drop of the medium during heat exchange can be better controlled, and the medium is prevented from being over-heated in a section of overlong heat exchange area. The opposite direction of the corrugation can partially offset the internal stress of the heat exchange plate when the corrugation is pressed, thus reducing the distortion degree of the heat exchange plate and leading the sealing surface and the contact of the heat exchange plate to be more attached.

According to a preferred embodiment of the present invention, the middle valley 3 is S-shaped and formed by seamlessly splicing two arcs, the concave-convex directions of the two arcs are opposite, the diameters of the circles where the two arcs are located are the same, the two arcs are respectively located on two sides of a middle dividing line Z8 (i.e. a vertical central line in the figure) of the heat exchange plate 1 along the length direction, and the middle points of the two arcs are equidistant from the middle dividing line Z8;

as will be described in detail below, the middle valley 3 is an S-shaped channel formed by a regular arc and a reverse arc, and an S-shaped uniform channel formed by a regular arc and a reverse arc. Wherein the regular circular arc is positioned at the near end side of the primary side inlet angle hole, and the central line of the regular circular arc is formed by connecting A1, A2 and A3 points on the heat exchange plate according to circular arcs. The reverse circular arc is positioned at the far end side of the inlet corner hole at the primary side, and the central line of the reverse circular arc is formed by connecting points A3, A4 and A5 on the heat exchange plate according to circular arcs. The whole flow of the primary side medium flowing from the corner hole to the right circular arc and the reverse circular arc is similar, and the pressure drop is approximately equivalent. Meanwhile, the S-shaped uniformly distributed flow channels enable the overall flow of the secondary side medium to be close to that of a normal circular arc and a reverse circular arc. If the medium is changed to a linear type or a single arc type, on one hand, the overall flow from the primary side medium to the positive arc and the secondary side medium to the negative arc cannot be ensured to be similar. On the other hand, the middle uniformly distributed flow channel in each layer of flow channel cannot be ensured to be in the same direction, so that a heat exchange area of another flow channel is adjacent to the uniformly distributed flow channel of one layer of flow channel, and the heat exchange efficiency is reduced.

In order to improve the uniformity of the medium flow, the inlet valley 2 and the outlet valley 4 are both circular arcs, and the concave-convex directions of the inlet valley 2 and the outlet valley 4 are opposite; all the intermediate valleys 3 are identical in shape and structure. The inlet valley 2 and the outlet valley 4 in opposite concave-convex directions and the circular arcs have the same size, so that the inlet valley 2 and the outlet valley 4 in the primary side medium flow channel and the inlet valley 2 and the outlet valley 4 in the secondary side medium flow channel are overlapped up and down, and the heat exchange efficiency is not influenced.

In a preferred embodiment, the valleys approximately penetrate along the width direction of the heat exchange plate 1, and two end points of each valley are equal points of the heat exchange plate equally divided along the length direction;

specifically, as shown in fig. 1, the inlet valley 2 includes two end points A6, A8 and a midpoint a7, the middle valley 3 includes two end points a1, a5 and a midpoint a2, A3 and a4, the outlet valley 4 includes two end points a9, a11 and a midpoint a10, wherein the two end points A6 and A8 of the inlet valley 2, the two end points a1 and a5 of the middle valley 3, the two end points a9 and a11 of the outlet valley 4 are respectively a 1/4 equally-dividing point of two length sides of the heat exchange plate 1, an intersection point of A3 point position transverse centerline Z3 and a centerline Z8, and an point a7 is a distance point that an intersection point of the transverse centerline Z3 and a centerline Z9 of a right side 1/2W is offset to the right H3. Point a10 is the point where the intersection of the transverse centerline Z3 with the centerline Z7 of the left 1/2W is offset from the left H4 distance, and H4 and H3 distances coincide. The inlet valley 2 and the outlet valley 4 are spaced from the corner holes by a certain distance, so that the inlet heat exchange area and the outlet heat exchange area have certain widths, and the media are primarily distributed.

The number of the middle valleys 3 is odd, the central point of the most middle valley along the length direction is approximately the central point of the heat exchange plate 1, and particularly, when the number of the middle valleys is 3, as shown in fig. 1, that is, the central point a3 of the middle valley 3 is approximately the central point of the heat exchange plate 1, and the twisting degrees of the plates on the left and right sides of the central point are equivalent and symmetrical. The valley in the primary side medium flow passage and the valley in the secondary side medium flow passage are mutually overlapped up and down.

In one preferred embodiment, when two heat exchange plates 1 are stacked, the upper, lower, left, right, and four sides of each flow channel are respectively one of the heat exchange plates 1, the other heat exchange plate 1, a left heat exchange area, and a right heat exchange area. The width of the valleys is 3-6 times the depth of the raised corrugations, and the depth of the valleys is equal to or similar to the depth of the raised corrugations. The corrugation depth of the wide-width plate heat exchanger is generally 2-3mm, and the width of the valley is 6-18 mm. The narrow valleys do not provide uniform flow distribution. The excessively wide valleys have low strength on one hand and occupy excessive space on the other hand, so that the heat exchange area is reduced.

At least four orifices are arranged at four corners of the heat exchange plate 1, two orifices are used as inlets of the heat exchange plate and are positioned in the inlet heat exchange area 5, and the other two orifices are used as outlets of the heat exchange plate 1 and are positioned in the outlet heat exchange area 7. Wherein, the inlet comprises a primary side inlet 8A and a secondary side inlet 9A, and the outlet comprises a primary side outlet 8B and a secondary side outlet 9B.

According to a preferred embodiment of the present invention, the distance between the two middle points of the two circular arcs in the middle valley and the center point of one of the outlets/inlets is the same, and a circle can be formed by using the center point of one of the outlets/inlets as a circular point and using the two middle points of the two circular arcs in the middle valley 3 as an arc point. Taking one of the inlets as an example, the center point of the circle Y is the center of the primary inlet 8A, and the circle Y passes through points a2 and a4, in other words, the three points a2 and a4 of the center of the primary inlet 8A form a circle Y. The flow of the medium from the center of the primary inlet 8A to the points a2 and a4 is equal.

According to a preferred embodiment of the present invention, the middle points of the arcs of the inlet valley and the outlet valley are located on the middle dividing line of the heat exchange plate in the width direction. That is, point A7 is the right H3 distance point at which the intersection of the transverse centerline Z3 and the centerline Z9 of the right side 1/2W. Point a10 is the point at which the intersection of the transverse centerline Z3 and the centerline Z7 of the left 1/2W is offset from the left H4 distance. Z2 and Z4 are both transverse 1/4 lines and transverse 3/4 lines.

Another embodiment provides a plate heat exchanger, which includes an upper end plate, at least two heat exchange plates and a lower end plate stacked in sequence, a flow channel is formed between corresponding valleys between two adjacent heat exchange plates, an inlet flow channel is formed between corresponding inlet valleys between two adjacent heat exchange plates, an intermediate flow channel is formed between corresponding intermediate valleys between two adjacent heat exchange plates, an outlet flow channel is formed between corresponding outlet valleys between two adjacent heat exchange plates, and the flow channel and the heat exchange area are communicated with each other for medium circulation.

Wherein at least two adjacent heat exchanger plates are heat exchanger plates according to any of claims 1-7.

Considering that when the flow channel is too wide or the pressure difference between the primary side medium and the secondary side medium is large, the upper plane and the lower plane of the flow channel cannot keep the shape of the flow channel, the following design is carried out, and the support is arranged in the flow channel, specifically:

for any flow channel, when two adjacent heat exchange plates 1 are superposed, the two adjacent heat exchange plates are abutted against the protrusion 10 corresponding to the flow channel so as to enhance the rigidity of the flow channel, or when one of the two adjacent heat exchange plates 1 is provided with the protrusion 10, and the other heat exchange plate 1 is not provided with the protrusion 10, when the two heat exchange plates 1 are superposed, the protrusion 10 is abutted against the valley of the other heat exchange plate 1 so as to enhance the rigidity of the flow channel. The flow channel is provided with a support column, so that the rigidity of the flow channel can be enhanced, and the flow channel is suitable for the condition that the flow channel is too wide or the pressure difference of media on two sides is too large.

The specific shape of the protrusion 9 may be various, such as a cross section of a cylinder or a triangular prism, as long as it has a certain rigidity.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.