CN116793116A

CN116793116A - Plate heat exchanger

Info

Publication number: CN116793116A
Application number: CN202211360334.0A
Authority: CN
Inventors: 张凌杰; 张婷; 张小彬; 周高飞; 张建康
Original assignee: Zhejiang Sanhua Plate Exchange Technology Co ltd
Current assignee: Zhejiang Sanhua Plate Exchange Technology Co ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-09-22

Abstract

The application provides a plate heat exchanger, which comprises a plurality of first plates and a plurality of second plates, wherein the plate heat exchanger is provided with first plate-to-plate channels and second plate-to-plate channels, the first plates are provided with first plate corrugations, and the second plates are provided with second plate corrugations; the first plate and the second plate each have a first corner hole and a second corner hole, the first plate and the second plate each include two second sides, the plate heat exchanger includes a first distribution area in which the first plate corrugation includes a first corrugation extending obliquely from a peripheral side of the first corner hole toward a second side of the two second sides away from the first corner hole, and a second distribution area in which the second plate corrugation includes a second corrugation extending obliquely from a peripheral side of the second corner hole toward a second side of the two second sides away from the second corner hole, the plate heat exchanger has a first connection portion in which the first corner hole is located. Thus improving the performance of the plate heat exchanger.

Description

Plate heat exchanger

Technical Field

The application belongs to the field of heat exchangers, and particularly relates to a plate heat exchanger.

Background

The plate heat exchanger has the advantages of compact structure, high heat exchange coefficient, strong reliability, small refrigerant filling amount and the like, and is widely applied to refrigeration and heating systems as an evaporator, a condenser, an economizer and the like.

The plate design has a great influence on the performance of the heat exchanger, and in order to achieve better performance, it is necessary to propose a plate heat exchanger.

Disclosure of Invention

In order to solve the problems, the application aims to provide a plate heat exchanger capable of improving the performance.

The application provides a plate heat exchanger, which comprises a plurality of first plates and a plurality of second plates, wherein the first plates and the second plates are alternately overlapped along the thickness direction of the plate heat exchanger; the plate heat exchanger has first plate interspaces between the front side of a first plate and the back side of an adjacent second plate, and second plate interspaces between the front side of a second plate and the back side of an adjacent first plate, the first plate having first plate corrugations and the second plate having second plate corrugations;

the first plate and the second plate are respectively provided with a first angle hole and a second angle hole, the first angle holes are communicated with the first inter-plate channels, and the second angle holes are communicated with the second inter-plate channels; the first plate and the second plate each comprise two first edges, the first edges extend along the width direction of the plate heat exchanger, one of the first corner holes and the second corner holes is close to one first edge, and the other is close to the other first edge;

The first plate and the second plate each comprise two second edges, the second edges extend along the length direction of the plate heat exchanger, the first corner hole is close to one of the second edges, the plate heat exchanger comprises a first distribution area and a second distribution area, the first corner hole is positioned in the first distribution area, the first plate corrugation comprises a first corrugation, and the first corrugation extends from the periphery of the first corner hole to a second edge, away from the first corner hole, of the two second edges; the second corner hole is close to one of the second edges, the second corner hole is located in a second distribution area, and in the second distribution area, the second plate corrugation comprises second corrugation, and the second corrugation extends from the periphery of the second corner hole to the second edge away from the second corner hole;

the plate heat exchanger is provided with a first connecting portion, the first connecting portion comprises a first flat connecting portion and a second flat connecting portion, the first flat connecting portion is located on a first plate, first plate corrugations extend to the first flat connecting portion, the second flat connecting portion is located on a second plate, second plate corrugations extend to the second flat connecting portion, the back face of the first flat connecting portion is connected with the front face of an adjacent second flat connecting portion, and the first corner hole is located in the first connecting portion.

In the plate heat exchanger provided by the application, in the first distribution area, the first corrugation extends obliquely from the periphery of the first corner hole to the second edge far away from the first corner hole in the two second edges, and in the second distribution area, the second corrugation extends obliquely from the periphery of the second corner hole to the second edge far away from the second corner hole in the two second edges, so that the distribution performance of fluid is improved; and through setting up first connecting portion, first angle hole is located in the first connecting portion, make first angle hole and second inter-plate passageway have the interval, improved plate heat exchanger's anti-icing performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a perspective view of a plate heat exchanger according to an embodiment of the present application;

fig. 2 is an exploded view of a plate heat exchanger according to an embodiment of the present application;

FIG. 3 is a front view of a first plate provided in an embodiment of the present application;

FIG. 4 is a front view of a second plate provided in an embodiment of the present application;

FIG. 5 is a partial cross-sectional view of a plate heat exchanger according to an embodiment of the present application;

FIG. 6 is an enlarged view of the structure of circle A in FIG. 5;

FIG. 7 is another partial cross-sectional view of a plate heat exchanger according to an embodiment of the present application;

FIG. 8 is an enlarged view of the structure of circle B in FIG. 7;

fig. 9 is a broken view of a plate heat exchanger according to an embodiment of the present application;

FIG. 10 is a block diagram of the back side of a first plate and the front side of a second plate in an embodiment of the application;

FIG. 11 is a block diagram of the front side of a first plate and the back side of a second plate in an embodiment of the application;

FIG. 12 is a block diagram of a first connection portion with a connection table according to an embodiment of the present application;

FIG. 13 is a D-D sectional view of FIG. 9;

FIG. 14 is a diagram showing the connection of a first plate corrugation to a second plate corrugation in accordance with an embodiment of the present application;

FIG. 15 is a further partial cross-sectional view of a plate heat exchanger according to an embodiment of the present application;

fig. 16 is an enlarged view of the structure of the circle E in fig. 15.

Detailed Description

For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1, 2, 7 and 8, the plate heat exchanger provided in this embodiment includes a plurality of first plates 1 and a plurality of second plates 2, and the plurality of first plates 1 and the plurality of second plates 2 are alternately stacked along a thickness direction of the plate heat exchanger; the plate heat exchanger has first plate interspaces 3 and second plate interspaces 4, the first plate interspaces 3 being between the front side of a first plate 1 and the back side of an adjacent second plate 2, the second plate interspaces 4 being between the front side of the second plate 2 and the back side of an adjacent first plate 1, the first plate 1 having first plate corrugations and the second plate 2 having second plate corrugations. Each plate is front and back on both sides in the thickness direction of the plate heat exchanger (T-T direction as shown in fig. 1), and the stacked plates alternate the first plate interspaces 3 and the second plate interspaces 4 in the thickness direction of the plate heat exchanger. In this embodiment, the first sheet 1 and the second sheet 2 are stacked and then connected as a whole through a brazing process, and in other embodiments, the first sheet 1 and the second sheet 2 may be fixedly connected through an outer member after being stacked, or may be connected through bonding or the like.

Referring again to fig. 1, in combination with fig. 3 and 4, the first plate 1 and the second plate 2 each have a first corner hole C1 and a second corner hole C2, the first corner hole C1 communicates with the first inter-plate channel 3, the second corner hole C2 communicates with the second inter-plate channel 4, and in addition, the first plate 1 and the second plate 2 each have a third corner hole C3 and a fourth corner hole C4, the third corner hole C3 communicates with the first inter-plate channel 3, and the fourth corner hole C4 communicates with the second inter-plate channel 4. In the present embodiment, the first inter-plate channel 3 is used for circulating the refrigerant, the first corner hole C1 is used for flowing the refrigerant into the first inter-plate channel 3, and the third corner hole C3 is used for flowing the refrigerant out of the first inter-plate channel 3; the second inter-plate channels 4 are for circulating a heat exchange medium (such as water) that exchanges heat with the refrigerant in the first inter-plate channels 3, one of the second corner holes C2 and the fourth corner holes C4 is for the heat exchange medium to flow into the second inter-plate channels 4, and the other is for the heat exchange medium to flow out of the second inter-plate channels 4. In a specific embodiment, the second corner hole C2 is used for the heat exchange medium to flow into the second inter-plate channel 4, and the fourth corner hole C4 is used for the heat exchange medium to flow out of the second inter-plate channel 4, and in the heat exchange process of the plate heat exchanger provided by the application, the heat exchange medium in the second inter-plate channel 4 exchanges heat with the refrigerant in the first inter-plate channel 3.

The plate heat exchanger provided by the application can be used as a condenser and also can be used as an evaporator. When the condenser is used as a condenser, a cold heat exchange medium (such as cold water) circulates in the second inter-plate channel 4, the refrigerant gas discharged by the compressor flows in the first inter-plate channel 3 after passing through the first corner hole C1, the refrigerant in the first inter-plate channel 3 absorbs cold energy in the cold water in the second inter-plate channel 4 to be condensed into liquid refrigerant to flow out of the first inter-plate channel 3, and the cold water in the second inter-plate channel 4 absorbs heat of the refrigerant to flow out of the hot water. When the evaporator is used, a heat exchange medium (such as hot water) flows through the second inter-plate channels 4, the gas-liquid two-phase refrigerant passing through the expansion valve flows through the first inter-plate channels 3 after passing through the first corner holes C1, the refrigerant in the first inter-plate channels 3 absorbs heat of hot water in the second inter-plate channels 4 to be overheated into refrigerant gas and then flows out of the first inter-plate channels 3, and the hot water in the second inter-plate channels 4 absorbs cold energy of the refrigerant and then flows out as cold water.

Referring again to fig. 3 and 4, the first plate 1 and the second plate 2 each comprise two first edges 5, the first edges 5 extending in the width direction of the plate heat exchanger (W-W direction as shown in fig. 1), one of the first portholes C1 and the second portholes C2 being adjacent to one of the first edges 5 and the other being adjacent to the other first edge 5. In addition, the first plate 1 and the second plate 2 each comprise two second edges 6, the second edges 6 extending in the length direction of the plate heat exchanger (L-L direction as shown in fig. 1), the first porthole C1 being adjacent to one of the second edges 6, the plate heat exchanger comprising a first distribution area 10 and a second distribution area 20, the first porthole C1 being located in the first distribution area 10, the first plate corrugation comprising a first corrugation 11, the first corrugation 11 extending obliquely from the periphery of the first porthole C1 to the second edge 6 of the two second edges 6 remote from the first porthole C1, the first corrugation 11 having a first oblique angle α with respect to the second edges 6, the first oblique angle α being directed towards the second porthole C2; the second corner hole C2 is located close to one of the second sides 6, the second corner hole C2 being located in the second distribution area 20, the second plate corrugation comprising a second corrugation 21, the second corrugation 21 extending obliquely from the circumferential side of the second corner hole C2 to the second side 6 of the two second sides 6 remote from the second corner hole C2, the second corrugation 21 having a second inclination angle beta with respect to the second side 6, the second inclination angle beta being directed towards the first corner hole C1. In this embodiment, the first edge 5 is disposed adjacent to the second edge 6, the first plate 1 and the second plate 2 are substantially rectangular, and corners thereof are rounded, that is, the first plate 1 and the second plate 2 each include a rounded edge 7, and the adjacent first edge 5 and second edge 6 are connected by the rounded edge 7. In this embodiment, the first corner hole C1 and the third corner hole C3 are distributed along one of the second sides 6, the second corner hole C2 and the fourth corner hole C4 are distributed along the other of the second sides 6, the first corner hole C1 and the fourth corner hole C4 are distributed along one of the first sides 5, the first distribution area 10 is used for refrigerant distribution when the first corner hole C1 is used for refrigerant inflow, and the second distribution area 20 is used for heat exchange medium distribution when the second corner hole C2 is used for heat exchange medium inflow. Of course, in other embodiments, the first corner hole C1 and the third corner hole C3 may be diagonally distributed, and the second corner hole C2 and the fourth corner hole C4 may be diagonally distributed.

In this embodiment, the front faces of the first plate 1 and the second plate 2 are both fluid facing faces, and in the heat exchange working state of the plate heat exchanger, the front face of the first plate 1 faces the entering direction of the refrigerant, and likewise, the front face of the second plate 2 faces the entering direction of the heat exchange medium. Specifically, in the first distribution area 10, the refrigerant is flushed back to the first corrugation 11 of the first plate 1 in the first distribution area 10 through the first corner hole C1, and since the first corrugation 11 extends obliquely from the circumferential side of the first corner hole C1 to the second side 6 away from the first corner hole C1, and the first corrugation 11 has no corner, the first corrugation 11 has better flow guiding and distribution effect on the refrigerant, and the refrigerant can flow obliquely through the first corrugation 11 and can cover the first distribution area 10 more smoothly and uniformly, so that the refrigerant is prevented from being distributed or more distributed only on one side close to the first corner hole C1. Similarly, in the second distribution area 20, the heat exchange medium is flushed back to the second corrugation 21 of the second plate 2 in the second distribution area 20 through the second angular hole C2, and since the second corrugation 21 extends obliquely from the peripheral side of the second angular hole C2 to the second side 6 away from the second angular hole C2, and the second corrugation 21 has no folding angle, the second corrugation 21 has better flow guiding and distributing effect on the heat exchange medium, and the heat exchange medium can flow obliquely through the second corrugation 21 and cover the second distribution area 20 more smoothly and uniformly, so that the heat exchange medium is prevented from being distributed or more distributed only on one side close to the second angular hole C2. According to the embodiment, the first corrugation 11 in the first distribution area 10 and the second corrugation 21 in the second distribution area 20 are designed, so that the refrigerant and the heat exchange medium can be uniformly distributed at the beginning of entering the corresponding plate-to-plate channel, the flow can be guided to the second edge 6 far away from the entering corner hole, the problem that the refrigerant and the heat exchange medium are concentrated on one side is avoided, the heat exchange effect of the subsequent refrigerant and the heat exchange medium is facilitated, the heat exchange surfaces of the first plate sheet 1 and the second plate sheet 2 can be fully utilized, and the heat exchange performance of the plate heat exchanger is improved.

In addition, when the plate heat exchanger provided by the application is used as an evaporator, the temperature of the refrigerant inlet side (namely the position of the first corner hole C1) is low, and the heat exchange medium exchanging heat with the refrigerant flows to the position corresponding to the refrigerant inlet, so that the risk of freezing is high, the volume expansion is easy to cause once the freezing occurs, the heat exchange plate at the freezing position is subjected to the problems of stress cracking, tearing, breakage and the like, and the refrigerant is bypassed to the side of the heat exchange medium, so that the plate heat exchanger is invalid. In order to reduce or prevent the freezing phenomenon of the heat exchange medium at the location, referring to fig. 7 and 8, and referring to fig. 5, 6 and 9, in the embodiment, the plate heat exchanger has the first connection portion 100, the first connection portion 100 includes the first flat connection portion 1a and the second flat connection portion 2a, the first flat connection portion 1a is located on the first plate 1, the second flat connection portion 2a is located on the second plate 2, the back surface of the first flat connection portion 1a is connected with the front surface of the adjacent second flat connection portion 2a, the first corner hole C1 penetrates the first connection portion 100 along the thickness direction of the plate heat exchanger, in other words, the first corner hole C1 is located in the first connection portion 100, and by arranging the first connection portion 100 such that the first corner hole C1 is spaced from the second plate channel 4, the freezing phenomenon caused by the low temperature of the refrigerant at the first corner hole C1 when the heat exchange medium in the second plate channel 4 flows close to the first corner hole C1 is avoided, which is beneficial to improving the durability of the plate heat exchanger. Further, the edge of the second inter-plate channel 4 connected to the first connecting portion 100 is defined as a first edge 40 (as shown by the thick dotted line in fig. 9), and the second inter-plate channel 4 and the first corner hole C1 are distributed on two sides of the first edge 40; the minimum distance between the first edge 40 and the edge of the first corner hole C1 is greater than or equal to 2mm, such as 2.5mm, 3mm, 3.5mm, 4mm, 5mm and the like, and the connection strength of the first edge and the first corner hole C1 is ensured, the heat exchange medium in the second plate-to-plate channel 4 is ensured to have a distance from the first corner hole F1 by limiting the minimum distance between the first edge 40 and the edge of the first corner hole C1, the freezing risk is reduced, the freezing prevention effectiveness is improved, the connection strength of the front surface of the adjacent second plate and the back surface of the first plate at the first corner hole C1 is also ensured, and the durability of the plate heat exchanger is improved. In the present embodiment, the first plate corrugation extends to the first butt portion 1a, and the second plate corrugation extends to the second butt portion 2a. The first flat joint part 1a and the second flat joint part 2a are connected by adopting planes, and the first plate corrugation is connected with the first flat joint part 1a

In this embodiment, the length of the first edge 5 is smaller than the length of the second edge 6; one of the two first sides 5 is a first short side 5a, and the other is a second short side 5b; one of the two second sides 6 is a first long side 6a, the other is a second long side 6b, the first short side 5a and the second short side 5b are oppositely arranged, the first long side 6a and the second long side 6b are oppositely arranged, the first short side 5a is adjacent to the first long side 6a, and the second short side 5b is adjacent to the second long side 6 b. In some embodiments, the first corner hole C1 is adjacent to the first long side 6a and the second corner hole C2 is adjacent to the second long side 6b, i.e. the first corner hole C1 and the second corner hole C2 are diagonally distributed in the plate, as shown in fig. 1. In other embodiments, the first corner hole C1 and the second corner hole C2 are all distributed along the same second edge 6, which is not shown in the figures. The plate heat exchanger according to the present application will be described by taking an embodiment in which the first corner hole C1 is located near the first long side 6a and the second corner hole C2 is located near the second long side 6b as an example.

Referring again to fig. 3 and 4, the plate heat exchanger comprises a main heat exchange zone 30, the main heat exchange zone 30 being located between the first distribution zone 10 and the second distribution zone 20, the first distribution zone 10, the main heat exchange zone 30 and the second distribution zone 20 being distributed along the length of the plate heat exchanger. In this embodiment, the refrigerant continues to flow after covering the first distribution area 10, the heat exchange medium continues to flow after covering the second distribution area 20, and the refrigerant and the heat exchange medium flow to the plate-to-plate channels corresponding to the main heat exchange area 30 for enhanced heat exchange, and the first distribution area 10 and the second distribution area 20 are used for heat exchange in addition to distribution. Specifically, in the main heat exchange zone 30, the first plate corrugation includes the third corrugation 12, the second plate corrugation includes the fourth corrugation 22, the third corrugation 12 and the fourth corrugation 22 are both herringbone waves, and the opening angle direction of the third corrugation 12 is opposite to the opening angle direction of the fourth corrugation 22. In some embodiments, the third corrugation 12 and the fourth corrugation 22 have the same weight, and may be single-weight herringbone waves or herringbone waves with weight of 2 or more; in other embodiments, the number of inverted V waves of the third corrugation 12 and the fourth corrugation 22 are different. The intersections of the third corrugation 12 and the fourth corrugation 22 form dense contact point networks that impart pressure tightness and generate swirling flow, improving heat exchange performance. The degrees of the opening angle of the third corrugation 12 and the opening angle of the fourth corrugation 22 may be the same or different, and the above is only some embodiments, and the number of alternatives is not listed here.

Further, the third corrugation 12 has a first corrugation segment 12a near the first long side 6a, and the extending direction of the first corrugation segment 12a coincides with the extending direction of the first corrugation 11; the fourth corrugation 22 has a second corrugation segment 22a near the second long side 6b, the extension direction of the second corrugation segment 22a coincides with the extension direction of the second corrugation 21. In this embodiment, the first corrugation segment 12a is in contact with a portion of the first corrugation 11, another portion of the first corrugation 11 extends into the main heat exchange zone 30, and likewise, the second corrugation segment 22a is in contact with a portion of the second corrugation 21, another portion of the second corrugation 21 extends into the main heat exchange zone 30. In other words, the first corrugation 11 and the third corrugation 12g are partially identical in corrugation, and the second corrugation 21 and the fourth corrugation 22 are partially identical in corrugation.

Still further, referring again to fig. 3 and 4, in the first distribution area 10, the second plate corrugations include fifth corrugations 23, the opening angle of the fifth corrugations 23 is opposite to the opening angle of the first corrugations 11, the intersections of the fifth corrugations 23 and the first corrugations 11 form a dense network of contact points, and the fluid increases turbulence of the fluid during flowing into the channels, which in addition to enhancing heat exchange, also facilitates rapid and uniform distribution of the refrigerant in the first distribution area 10. Likewise, in the second distribution area 20, the first plate corrugation comprises a sixth corrugation 13, the opening angle of the sixth corrugation 13 is opposite to the opening angle of the second corrugation 21, the intersections of the sixth corrugation 13 and the second corrugation 21 form a dense network of contact points, and the fluid increases the turbulence of the fluid during the inflow channel, which in addition to enhancing the heat exchange, also contributes to a fast and even distribution of the heat exchange medium in the second distribution area 20.

As shown in fig. 15 and 16, in the second distribution area 20, the sixth corrugation 13 is provided with a plurality of first concave-convex portions 14, the first concave-convex portions 14 are protruded toward the first inter-plate channel 3, one side of the first concave-convex portions 14 toward the second inter-plate channel 4 is provided with first circulation grooves 14a, the first circulation grooves 14a are communicated with the second corner holes C2, the first circulation grooves 14a extend obliquely from the circumference of the second corner holes C2 to the first long side 6a, and the first concave-convex portions 14 are staggered. By providing the first concave-convex portion 14, resistance of the heat exchange medium is reduced, which contributes to improvement of distribution uniformity of the heat exchange medium.

Referring to fig. 8 again, in the first distribution area 10, the first corrugation 11 is provided with at least one second concave-convex portion 15, the second concave-convex portion 15 protrudes toward the first inter-plate channel 3, one side of the second concave-convex portion 15 toward the second inter-plate channel 4 is provided with a second circulation groove 15a, the second circulation groove 15a communicates with the fourth corner hole C4, the second circulation groove 15a extends obliquely from the circumference of the fourth corner hole C4 toward the first long side 6a, and the second concave-convex portions 15 are staggered. Through setting up second concave-convex part 15, reduced the resistance that heat transfer medium flows to fourth angle hole C4, heat transfer medium can more smoothly flow to fourth angle hole C4, avoid heat transfer medium to lead to the velocity of flow to reduce and then receive the influence of first angle hole C1 department refrigerant low temperature to take place the problem that the freezing risk increases because of the resistance.

In the above embodiment, the corrugations of the first distribution area 10, the main heat exchange area 30 and the second distribution area 20 may be selected to have the same or different corrugation pitches according to the actual heat exchange performance requirements.

Referring to fig. 9 again, one end of the first edge 40 is connected to the second edge 6 (i.e. the first long edge 6 a) near the first corner hole C1, the connection point is O1, and the other end is connected to the first edge 5 (i.e. the second long edge 6 b) near the first corner hole C1, the connection point is O2. In order to smoothly flow and guide the heat exchange medium in the second inter-plate channel 4 from the peripheral side of the first corner hole C1, freezing caused by the influence of low temperature of the refrigerant is avoided when the heat exchange medium stays near the first corner hole C1, the vertical distance from the point on the first edge 40 to the first edge 5 in the line direction from the connecting point O1 to the connecting point O2 is reduced, and the vertical distance can be reduced, namely, the problem of the stagnation area is avoided, so that the heat exchange medium in the second inter-plate channel 4 can smoothly flow when flowing to the first edge 40, the stagnation time is reduced, and the risk of freezing caused by the influence of low temperature of the refrigerant flowing into the first corner hole C1 is reduced.

Further, the first edge 40 and the connected second edge 6 form a first included angle θ, and an opening angle of the first included angle θ faces the first corner hole C1, wherein the first included angle θ is more than or equal to 10 ° and less than or equal to 30 °, and a diversion design with a large inclination rate is adopted, so that a diversion effect of the heat exchange medium at the edge of the channel 4 between the second plates is improved, the flowing time of the heat exchange medium at the place is reduced, and the freezing risk is reduced. In addition, the first edge 40 and the connected first edge 5 form a second included angle eta, the opening angle of the second included angle eta faces the first angle hole C1, wherein the second included angle eta is more than or equal to 70 degrees and less than or equal to 90 degrees, a diversion design with a large inclination rate is adopted, the risk of freezing is reduced, meanwhile, the second inter-plate channels 4 are not excessively occupied, the heat exchange area between the second inter-plate channels 4 and the first inter-plate channels 3 is ensured, and the heat exchange performance and the heat exchange effect are ensured.

In the above embodiment, since the first corner hole C1 and the fourth corner hole C4 are distributed along the first edge 5 as the short edge, the fourth corner hole C4 is closer to the first corner hole C1, and the first corner hole C1 is used as the refrigerant inlet, the temperature near the first corner hole C1 is lower, if the heat exchange medium stays in the portion for a long time, there is also a risk of freezing, and the corner of the second plate channel 4 at the peripheral side of the fourth corner hole C4 is very easy to have a slow flow or even stay due to a smaller flow space, so that freezing occurs, which results in the problems of desoldering, cracking, and the like of the portion of the heat exchange plate due to the frozen expansion of the heat exchange medium, and the plate heat exchanger is ineffective. For this, the present embodiment is designed as follows: as shown in fig. 10, the plate heat exchanger has a second connection portion 200, the second connection portion 200 includes a third flat connection portion 1b and a fourth flat connection portion 2b, the third flat connection portion 1b is located in the first plate 1, the fourth flat connection portion 2b is located in the second plate 2, the back surface of the third flat connection portion 1b is connected to the front surface of the fourth flat connection portion 2b adjacent thereto, the second connection portion 200 is located at a corner of the fourth corner hole C4 on the peripheral side, and the second connection portion 200 is connected to the rounded corner edge 7 of the fourth corner hole C4 on the peripheral side. In other words, the second inter-plate channel 4 is sealed at the corner of the peripheral side of the fourth corner hole C4 by the second connection portion 200, so that the heat exchange medium in the second inter-plate channel 4 cannot enter the corner of the peripheral side of the fourth corner hole C4, thereby reducing the risk of freezing caused by retention of the heat exchange medium at the corner and influence of low-temperature environment, and further improving the reliability and durability of the plate heat exchanger. In this embodiment, the third flat joint portion 1b and the first plate 1 are integrally formed by compression molding during the processing of the first plate 1, the fourth flat joint portion 2b and the second plate 2 are integrally formed by compression molding during the processing of the second plate 2, and at least one of the third flat joint portion 1b and the fourth flat joint portion 2b may protrude toward the second inter-plate channel 4, and the second inter-plate channel 4 is closed at the corner of the peripheral side of the fourth corner hole C4 by connecting the protruding structures with the plates or connecting the protruding structures with each other.

If the second angular hole C2 is used as an inlet of the heat exchange medium, if the second inter-plate channel 4 is provided with a flow channel at the corner of the peripheral side of the second angular hole C2, after the heat exchange medium enters from the second angular hole C2, the heat exchange medium is located at the corner of the peripheral side of the second angular hole C2, and the heat exchange medium enters the flow channel first because the flow channel is near to the corner of the peripheral side of the second angular hole C2 and has small flow resistance, most of the heat exchange medium flowing from the second angular hole C2 is accumulated on one side of the second edge 6 relatively near to the second angular hole C2, so that the heat exchange medium is unevenly distributed, the heat exchange medium does not fully utilize the heat exchange surface of the plate, and the heat exchange effect is affected. Therefore, in order to improve the distribution uniformity of the heat exchange medium, the present embodiment is designed as follows: as shown in fig. 10 and 13, the plate heat exchanger has a third connection portion 300, the third connection portion 300 includes a fifth butt joint portion 1C and a sixth butt joint portion 2C, the fifth butt joint portion 1C is located in the first plate 1, the sixth butt joint portion 2C is located in the second plate 2, the back surface of the fifth butt joint portion 1C is connected with the front surface of the adjacent sixth butt joint portion 2C, the third connection portion 300 is located at a corner on the peripheral side of the second corner hole C2, and the third connection portion 300 is connected with the rounded corner 7 on the peripheral side of the second corner hole C2. In other words, the second inter-plate channel 4 is sealed at the corner of the peripheral side of the second corner hole C2 by the third connecting portion 300, so that the heat exchange medium in the second inter-plate channel 4 cannot enter the corner of the peripheral side of the second corner hole C2, after entering from the second corner hole C2, the heat exchange medium can flow and be distributed to more opposite sides, namely, one side of the second side 6 far from the second corner hole C2, due to the sealing of the corner of the peripheral side of the second corner hole C2, so that the heat exchange medium can cover the second distribution area 20 more smoothly and uniformly, further flows more uniformly in the main heat exchange area 30, heat exchange can be performed by fully utilizing the heat exchange surface of the plate and the refrigerant in the inter-plate channel, the heat exchange effect is improved, and the heat exchange performance of the plate heat exchanger is enhanced. In this embodiment, the fifth butt joint portion 1C and the first plate 1 are integrally formed by compression molding during the processing of the first plate 1, the sixth butt joint portion 2C and the second plate 2 are integrally formed by compression molding during the processing of the second plate 2, and at least one of the fifth butt joint portion 1C and the sixth butt joint portion 2C may protrude toward the second inter-plate channel 4, and the second inter-plate channel 4 is closed at the corner of the peripheral side of the second corner hole C2 by connecting the protruding structures with the plates or connecting the protruding structures with each other. In addition, because the second corner hole C2 is used as an inlet of a heat exchange medium, higher pressure is needed, and the connection strength of the plate at the position of the second corner hole C2 can be effectively improved through the sealing design of the corners at the periphery of the second corner hole C2, so that the compression resistance of the position is improved.

The third corner hole C3 is relatively far away from the first corner hole C1, the heat exchange medium at the position corresponding to the third corner hole C3 in the second plate-to-plate channel 4 is less affected by the low temperature of the phase-placed refrigerant in the first corner hole C1, the risk of freezing is low, in order to increase the flow area of the heat exchange medium, improve the uniformity of distribution and enhance the heat exchange effect, and the embodiment is designed as follows: as shown in fig. 11 and 13, the plate heat exchanger has a fourth connection portion 400, the fourth connection portion 400 includes a seventh butt joint portion 1d and an eighth butt joint portion 2d, the seventh butt joint portion 1d is located in the first plate 1, the eighth butt joint portion 2d is located in the second plate 2, the front surface of the seventh butt joint portion 1d is connected to the back surface of the adjacent eighth butt joint portion 2d, the back surface of the seventh butt joint portion 1d is spaced from the front surface of the adjacent eighth butt joint portion 2d, the fourth connection portion 400 is located at a corner on the circumferential side of the third angle hole C3, and the fourth connection portion 400 is connected to the rounded corner edge 7 on the circumferential side of the third angle hole C3. In other words, the first plate-to-plate channel 3 is closed at the corner of the peripheral side of the third corner hole C3, and the second plate-to-plate channel 4 is opened at the corner of the peripheral side of the third corner hole C3, so that when the heat exchange medium flows to the peripheral side of the third corner hole C3, a part of the heat exchange medium can flow to the second side 6 close to the first corner hole C1, namely, the second side 6 far from the second corner hole C2, through the corner of the peripheral side of the third corner hole C3, so that the distribution uniformity of the heat exchange medium can be further enhanced, the flow area of the heat exchange medium is increased, and the heat exchange efficiency is improved. In this embodiment, the seventh butt joint portion 1d and the first plate 1 are integrally formed by press forming during the processing of the first plate 1, the eighth butt joint portion 2d and the second plate 2 are integrally formed by press forming during the processing of the second plate 2, and at least one of the seventh butt joint portion 1d and the eighth butt joint portion 2d may protrude toward the first inter-plate channel 3, and the first inter-plate channel 3 is closed at the corner of the peripheral side of the third corner hole C3 by connecting the protruding structures with the plates or connecting the protruding structures with each other.

In the above embodiment, the second connecting portion 200 and the third connecting portion 300 may also be sealing members (not shown) for sealing the corners of the corresponding inter-plate channels at the peripheral sides of the corresponding corner holes, and of course, the fourth connecting portion 400 may also be sealing members for connecting the plates at the two sides of the first inter-plate channel 3 at the position of the third corner hole C3, so as to improve the connection strength of the portion.

Referring to fig. 9 again, a plane perpendicular to the thickness direction of the plate heat exchanger is defined as a projection plane, and a projection area of the first connection portion 100 on the projection plane is larger than a projection area of any one of the second connection portion 200, the third connection portion 300 and the fourth connection portion 400 on the projection plane. In other words, the area of the first connection part 100 at the position of the first corner hole C1 is larger than the areas of the connection parts at the positions of the other corner holes, so that the interval between the second plate-to-plate channel 4 and the first corner hole C1 is ensured, the anti-freezing effect of the plate heat exchanger is achieved, the actual service performance of the plate heat exchanger is improved, and the service life of the plate heat exchanger is prolonged.

When the plate heat exchanger is used as an evaporator, referring to fig. 5 to 12 again, the plate heat exchanger further includes a distribution portion 8, the distribution portion 8 has a distribution hole 81, the distribution portion 8 is located in the first inter-plate channel 3, the distribution portion 8 is disposed at the first corner hole C1, and the distribution hole 81 communicates with the first corner hole C1 and the first inter-plate channel 3. In some embodiments, the distribution portion 8 is of unitary structure with the plates, in particular, at least one of the first plate 1 and the second plate 2 has the distribution portion 8, the distribution portion 8 is a boss protruding toward the first inter-plate channel 3, one of the first plate 1 and the second plate 2 may have a boss, for example, the first plate 1 has a boss, which meets the second plate 2; for example, the second plate 2 may have a boss, which is connected to the first plate 1, or both the first plate 1 and the second plate 2 may have a boss, which is connected to the boss. In other embodiments, the distributing part 8 and the plate are in a split structure before assembly, i.e. the distributing part 8 is a separate component, such as a distributor, which is placed in the first inter-plate channel 3 at the position of the first corner hole C1 during stacking assembly, and then connected as a whole by brazing or the like. In this embodiment, the projection area of the first corner hole C1 on the projection plane is larger than the projection area of any one of the second corner hole C2, the third corner hole C3 and the fourth corner hole C4 on the projection plane, that is, the flow area of the first corner hole C1 is smaller than the flow areas of the second corner hole C2, the third corner hole C3 and the fourth corner hole C4, so that the separation is convenient, in addition, the flow area of the first corner hole C1 is small and can play a role in throttling, and the local resistance is increased to improve the uniformity of the distribution of the refrigerant in each first inter-plate channel 3.

As shown in fig. 14, in the above embodiment, the first plate interspaces 3 and the second plate interspaces 4 are alternately distributed along the thickness direction of the plate heat exchanger, and in order to achieve a better heat exchanging performance and to reduce the pressure drop of the structure, one of the first plate corrugation and the second plate corrugation has a first ridge r and a second ridge p, the height of the second ridge p is smaller than the height of the first ridge r, at least one second ridge p is provided between adjacent first ridges r, at least one first ridge r is provided between adjacent second ridges p, and the second ridge p protrudes towards the second plate interspaces 4. Specifically, both the first ridge r and the second ridge p protrude from the same plane toward the second inter-plate channel 4, but the protruding height of the second ridge p (i.e., the height of the second ridge p) is smaller than the protruding height of the first ridge r, i.e., the height of the first ridge r. In this embodiment, the second plate corrugation has the first ridge r and the second ridge p, and the first plate corrugation has the first ridge r, and the first ridge r protrudes toward the second plate channel 4, so after the first plate 1 and the second plate 2 are stacked, the volume of the second plate channel 4 is larger than that of the first plate channel 3, that is, the plate heat exchanger adopts a single-side asymmetric channel structure, so that two plate channels with different volumes are formed, and the pressure drop of the structure can be effectively reduced without affecting the heat exchange performance.

As shown in fig. 12, in the above embodiment, the back surface of the first flat connection portion 1a is connected to the front surface of the adjacent second flat connection portion 2a, so that the second inter-plate channel 4 is closed on the peripheral side of the first corner hole C1, so that the first corner hole C1 and the second inter-plate channel 4 have a space therebetween, and a large-area empty space is formed between the front surface of the first flat connection portion 1a and the back surface of the adjacent second flat connection portion 2a, the first corner hole C1 needs to bear a large pressure as an inlet of the refrigerant, which is very easy to cause the plane deformation of the place, and the tearing problem of the plate at the place, which further causes the refrigerant to bypass to the heat exchange medium side, and the plate heat exchanger to fail. Therefore, in order to improve strength and pressure resistance at the refrigerant inlet, the plate heat exchanger of the present embodiment further includes a connection stage 9, the connection stage 9 being located between the front face of the first flat joint portion 1a and the back face of the adjacent second flat joint portion 2a, and the connection stage 9 being located on the peripheral side of the first corner hole C1. The front surface of the first butt joint part 1a is connected with the back surface of the adjacent second butt joint part 2a through the connecting table 9, so that the connection strength between the front surface of the first butt joint part 1a and the back surface of the adjacent second butt joint part 2a which are arranged at intervals is improved, the connection strength and the pressure resistance between the plates of the refrigerant inlet area are obviously improved, and the reliability and the durability of the plate heat exchanger are improved.

In some embodiments, at least one of the first sheet 1 and the second sheet 2 has a connection land 9, the connection land 9 is integrally formed with the sheet, the connection land 9 protrudes toward the first inter-sheet channel 3, for example, the first sheet 1 has a connection land 9, the connection land 9 is connected to the back surface of the second butt joint 2a of the adjacent second sheet 2, or the second sheet 2 has a connection land 9, the connection land 9 is connected to the front surface of the first butt joint 1a of the adjacent first sheet 1, or both the first sheet 1 and the second sheet 2 have a connection land 9, the connection land 9 is connected, and the connection land 9 is press-formed during sheet processing. In other embodiments, the connection platform 9 and the first plate 1 and the second plate 2 are in a split structure before being assembled, in the process of assembling, the connection platform 9 is placed on the front surface of the first butt joint part 1a of the first plate 1, then the second plate 2 is overlapped, and after the operation, the connection platform 9 and the first plate 1 and the second plate 2 are connected into a whole through brazing and other processes.

In the above embodiment, the plate heat exchanger may further include an end plate, a connection pipe, a bottom plate, and the like, which are not shown in the drawing, wherein the end plate is mounted on the front surface of the first plate, the bottom plate is mounted on the back surface of the last plate, the end plate is further mounted with a corresponding connection pipe, and an inner cavity of the connection pipe is communicated with the corresponding corner hole.

Some of the technical implementations in the above embodiments may be combined or replaced.

The technical principles of the present application have been described above in connection with specific embodiments, but it should be noted that the above descriptions are only for explaining the principles of the present application and should not be construed as limiting the scope of the present application in any way. Other embodiments of the application, or equivalents thereof, will suggest themselves to those skilled in the art without undue burden from the present disclosure, based on the explanations herein.

Claims

1. A plate heat exchanger, characterized in that: the heat exchanger comprises a plurality of first plates and a plurality of second plates, wherein the first plates and the second plates are alternately overlapped along the thickness direction of the plate heat exchanger; the plate heat exchanger has first plate interspaces between the front side of a first plate and the back side of an adjacent second plate, and second plate interspaces between the front side of a second plate and the back side of an adjacent first plate, the first plate having first plate corrugations and the second plate having second plate corrugations;

2. A plate heat exchanger according to claim 1, wherein: the first corrugation has a first angle of inclination relative to the second edge, the first angle of inclination being oriented towards the second angular aperture; the second corrugation has a second angle of inclination with respect to the second side, the second angle of inclination being oriented towards the first angular aperture;

the length of the first edge is smaller than that of the second edge; one of the two first sides is a first short side, and the other is a second short side; one of the two second edges is a first long edge, the other one is a second long edge, the first short edge is adjacent to the first long edge, the second short edge is adjacent to the second long edge, the first corner hole is close to the first long edge, and the second corner hole is close to the second long edge;

the plate heat exchanger comprises a main heat exchange area, the main heat exchange area is positioned between a first distribution area and a second distribution area, and the first distribution area, the main heat exchange area and the second distribution area are distributed along the length direction of the plate heat exchanger; in the main heat exchange area, the first plate corrugation comprises a third corrugation, the second plate corrugation comprises a fourth corrugation, the third corrugation and the fourth corrugation are herringbone waves, and the opening angle direction of the third corrugation is opposite to the opening angle direction of the fourth corrugation;

The third corrugation is provided with a first corrugation segment close to the first long side, and the extending direction of the first corrugation segment is consistent with that of the first corrugation; the fourth corrugation has a second corrugation segment near the second long side, and the extension direction of the second corrugation segment is consistent with the extension direction of the second corrugation.

3. A plate heat exchanger according to claim 2, wherein: in the first distribution area, the second plate corrugation comprises a fifth corrugation, and the opening angle of the fifth corrugation is opposite to the opening angle direction of the first corrugation;

in the second distribution area, the first plate corrugation comprises a sixth corrugation, and the opening angle of the sixth corrugation is opposite to the opening angle of the second corrugation.

4. A plate heat exchanger according to claim 3, wherein: the first plate and the second plate are respectively provided with a third angle hole and a fourth angle hole, the third angle hole is communicated with the first inter-plate channel, and the fourth angle hole is communicated with the second inter-plate channel;

the first inter-plate channels are used for circulating refrigerant, the first corner holes are used for enabling the refrigerant to flow into the first inter-plate channels, and the third corner holes are used for enabling the refrigerant to flow out of the first inter-plate channels; the second plate-to-plate channels are used for circulating heat exchange media exchanging heat with the refrigerant in the first plate-to-plate channels, one of the second corner holes and the fourth corner holes is used for enabling the heat exchange media to flow into the second plate-to-plate channels, and the other is used for enabling the heat exchange media to flow out of the second plate-to-plate channels;

The first plate and the second plate both comprise rounded edges, and the adjacent first edges and second edges are connected through the rounded edges.

5. A plate heat exchanger according to claim 3, wherein: in the second distribution area, the sixth corrugation is provided with a plurality of first concave-convex parts, the first concave-convex parts are protruded towards the first inter-plate channels, one side of the first concave-convex parts, which faces the second inter-plate channels, is provided with first circulation grooves, the first circulation grooves are communicated with the second angular holes, the first circulation grooves extend obliquely from the periphery of the second angular holes to the first long side, and the first concave-convex parts are distributed in a staggered manner;

in the first distribution area, the first corrugation is provided with at least one second concave-convex part, the second concave-convex part protrudes towards the first inter-plate channel, one side of the second concave-convex part, which faces the second inter-plate channel, is provided with a second circulation groove, the second circulation groove is communicated with the fourth corner hole, the second circulation groove extends from the periphery of the fourth corner hole to the first long side in an inclined mode, and the second concave-convex parts are distributed in a staggered mode.

6. A plate heat exchanger according to claim 4, wherein: one of the first and second plate corrugations has first and second ridges, the second ridge having a height less than the height of the first ridge, at least one second ridge between adjacent first ridges, at least one first ridge between adjacent second ridges, both the first and second ridges protruding from the same plane toward the second inter-plate channel.

7. A plate heat exchanger according to claim 4, wherein: defining the edge of the second inter-plate channel connected with the first connecting part as a first edge, wherein the second inter-plate channel and the first corner holes are distributed on two sides of the first edge; the minimum distance between the first edge and the edge of the first corner hole is more than or equal to 2mm;

one end of the first edge is connected with the second edge close to the first corner hole, and the other end of the first edge is connected with the first edge close to the first corner hole; the first edge decreases in vertical distance from a point on the first edge to the first edge in a line direction from a point of contact with the second edge to a point of contact with the first edge.

8. A plate heat exchanger according to claim 7, wherein: the first edge and the second edge which are connected form a first included angle, and the opening angle of the first included angle faces to the first angle hole, wherein the first included angle is more than or equal to 10 degrees and less than or equal to 30 degrees;

the first edge and the connected first edge form a second included angle, and the opening angle of the second included angle faces to the first angle hole, wherein the second included angle is more than or equal to 70 degrees and less than or equal to 90 degrees.

9. A plate heat exchanger according to any one of claims 4 to 8, wherein: the plate heat exchanger is provided with a second connecting part, the second connecting part comprises a third butt joint part and a fourth butt joint part, the third butt joint part is positioned on the first plate, the fourth butt joint part is positioned on the second plate, the back surface of the third butt joint part is connected with the front surface of the fourth butt joint part adjacent to the third butt joint part, the second connecting part is positioned at the corner of the peripheral side of the fourth corner hole, and the second connecting part is connected with the round corner edge of the peripheral side of the fourth corner hole;

The plate heat exchanger is provided with a third connecting part, the third connecting part comprises a fifth butt joint part and a sixth butt joint part, the fifth butt joint part is positioned on the first plate, the sixth butt joint part is positioned on the second plate, the back surface of the fifth butt joint part is connected with the front surface of the sixth butt joint part adjacent to the fifth butt joint part, the third connecting part is positioned at the corner of the peripheral side of the second angular hole, and the third connecting part is connected with the round angular edge of the peripheral side of the second angular hole;

the plate heat exchanger is provided with a fourth connecting part, the fourth connecting part comprises a seventh butt joint part and an eighth butt joint part, the seventh butt joint part is positioned on the first plate, the eighth butt joint part is positioned on the second plate, the front surface of the seventh butt joint part is connected with the back surface of the eighth butt joint part adjacent to the seventh butt joint part, the back surface of the seventh butt joint part is arranged at intervals with the front surface of the eighth butt joint part adjacent to the seventh butt joint part, the fourth connecting part is positioned at the corner of the peripheral side of the third angle hole, and the fourth connecting part is connected with the round corner edge of the peripheral side of the third angle hole;

and defining a plane perpendicular to the thickness direction of the plate heat exchanger as a projection plane, wherein the projection area of the first connecting part on the projection plane is larger than the projection area of any one of the second connecting part, the third connecting part and the fourth connecting part on the projection plane.

10. A plate heat exchanger according to claim 9, wherein: the plate heat exchanger further comprises a distribution part, wherein the distribution part is provided with a distribution hole, the distribution part is positioned in the first plate-to-plate channel, the distribution part is arranged at the first corner hole, and the distribution hole is communicated with the first corner hole and the first plate-to-plate channel;

the projection area of the first angle hole on the projection plane is larger than the projection area of any one of the second angle hole, the third angle hole and the fourth angle hole on the projection plane;

the plate heat exchanger further comprises a connecting table, wherein the connecting table is positioned between the front surface of the first flat joint part and the back surface of the adjacent second flat joint part, and the connecting table is positioned on the periphery side of the first angle hole.