Plate heat exchanger with fluid distribution function and fluid balance function

Abstract

The utility model discloses a plate heat exchanger with a fluid distribution function and a fluid balance function, which comprises a first heat exchange plate and a second heat exchange plate which are alternately arranged, each of the first heat exchange plate and the second heat exchange plate is of a corrugated plate structure with a ridge part and a groove part, and each of the first heat exchange plate and the second heat exchange plate is provided with a first corner hole; the refrigerant side spaces and the heat exchange side spaces are alternately arranged; the first heat exchange plate is provided with a first boss as high as the ridge part corresponding to the first corner hole, and the second heat exchange plate is provided with a first sinking platform as deep as the groove part corresponding to the first corner hole; a fluid distribution structure is formed in the refrigerant side space corresponding to the first boss and the first sinking table; and at least one fluid balance structure communicated with the adjacent refrigerant side space is arranged at the position, corresponding to the relative total energy smaller than 50% of the pressure potential energy, in the refrigerant side space. According to the utility model, the fluid distribution structure and the fluid balance structure are matched to balance the flow and the pressure among the refrigerant side spaces, and the heat transfer effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a plate heat exchanger with fluid distribution function and fluid balance function. Background Art

[0002] At present, plate heat exchangers are mostly used as evaporators in heat pump refrigeration systems. In order to make full use of the heat transfer performance of the plate heat exchanger as a high-performance evaporator, a corner hole distributor is generally arranged between the inlet channel at the first corner hole and the refrigerant side air side to optimize the distribution of the refrigerant, so that the fluid distribution between the refrigerant channels of the heat exchanger is more reasonable and the heat transfer is more effective, thereby making the performance of the heat pump system better and the energy efficiency higher. The existing corner hole distributors are generally external distributors extending into the first corner hole area or restricted holes implemented on the plates near the first corner hole area. They increase the available pressure of the refrigerant flowing from the inlet channel into the corresponding refrigerant side space to improve the flow uniformity of the refrigerant. However, due to the flow resistance and manufacturing reasons of the heat exchanger, the existing corner hole distributors can only achieve a certain degree of balance and optimization, and the refrigerant flow rates in each refrigerant side space cannot be fully balanced, resulting in uneven boiling surfaces of the refrigerant in the refrigerant side space, which deteriorates the heat transfer effect and there is room for improvement. Summary of the Utility Model

[0003] The utility model aims to overcome the above defects in the prior art and provides a plate heat exchanger with fluid distribution function and fluid balance function. First, the fluid distribution structure is used to increase the available pressure of the refrigerant flowing into each refrigerant side space to improve the fluid distribution uniformity, and then the fluid balance structure is used to connect adjacent refrigerant side spaces to achieve the balance of flow rate and pressure, greatly increasing the heat transfer performance of the heat exchanger and reducing the total flow resistance.

[0004] To achieve the above object, the utility model provides a plate heat exchanger with fluid distribution function and fluid balance function, including:

[0005] The first heat exchange plates and the second heat exchange plates are alternately stacked from top to bottom. Both the first heat exchange plates and the second heat exchange plates are corrugated plate structures with ridges and grooves. The first heat exchange plates and the second heat exchange plates are both provided with relatively arranged first corner holes, second corner holes, third corner holes and fourth corner holes, and an inlet channel for the refrigerant to pass through the heat exchanger is defined at the corresponding first corner holes.

[0006] The refrigerant side spaces for the refrigerant to flow through. Each refrigerant side space is supported and cooperated by the grooves on the first heat exchange plates and the ridges on the adjacent second heat exchange plates below.

[0007] For the heat exchange side space for the flow of the heat exchange medium, each of the heat exchange side spaces is supported and cooperated by the groove portion on the second heat exchange plate and the ridge portion on the adjacent lower first heat exchange plate;

[0008] Wherein the refrigerant side space and the heat exchange side space are arranged alternately;

[0009] At the position corresponding to the first corner hole of each first heat exchange plate, a first boss that bulges upward and has the same bulging height as the ridge portion thereon is provided, and at the position corresponding to the first corner hole of each second heat exchange plate, a first sunk portion that sinks downward and has the same sinking depth as the groove portion thereon is provided;

[0010] In the heat exchange side space, the first sunk portion on the second heat exchange plate is supported and connected to the first boss on the first heat exchange plate to limit the refrigerant in the inlet passage from flowing in;

[0011] In the refrigerant side space, a fluid distribution structure for the refrigerant in the inlet passage to flow into the refrigerant side space is formed at the positions corresponding to the first boss of the first heat exchange plate and the first sunk portion of the second heat exchange plate;

[0012] In each refrigerant side space, at least one fluid balance structure for connecting adjacent refrigerant side spaces is constructed and arranged at a position where the pressure potential energy relative to the total energy is less than 50%;

[0013] Further set as: at least one groove enclosure that sinks downward and has the same sinking depth as the groove portion thereon is provided on the outer side of the first boss of the first heat exchange plate corresponding to the first corner hole;

[0014] On the first sunk portion of the second heat exchange plate, a ridge enclosure that bulges upward and has the same bulging height as the ridge portion thereon and corresponds to the groove enclosure one by one is provided;

[0015] In the refrigerant side space, the groove enclosure and the ridge enclosure are correspondingly supported and connected to partition the space between the first boss and the first sunk portion into at least two, and at least one liquid inlet passage for connecting adjacent spaces is provided on the partition structure formed by the connection of the corresponding groove enclosure and ridge enclosure;

[0016] Further set as: at least one first groove is provided on the bottom surface of each groove enclosure;

[0017] On the top surface of each ridge enclosure, a second groove that cooperates with the first groove is correspondingly provided, and the first groove and the second groove are aligned to form a liquid inlet passage;

[0018] Further set as: the liquid inlet passage is a gradually expanding structure with a diameter gradually increasing along the flow direction;

[0019] Further set as: at least one first balance hole is provided on the first boss of the first heat exchange plate corresponding to the outer side of the groove enclosure;

[0020] On the first sunken platform of the second heat exchange plate, there are second balance holes corresponding one-to-one to the first balance holes;

[0021] The first balance holes and the second balance holes cooperate and communicate to form a fluid balance structure.

[0022] It is further set that: both the first heat exchange plate and the second heat exchange plate are rectangular plate structures, and the first corner hole and the second corner hole are respectively arranged at two corners at the same end of the relative length direction of the plate;

[0023] At the position corresponding to the second corner hole on the first heat exchange plate, there is a second sunken platform that is recessed downward and has the same recessed depth as the groove portion thereon; at the corner corresponding to the outside of the second sunken platform on the first heat exchange plate, there is a first communication portion that bulges upward and has the same bulging height as the ridge portion thereon;

[0024] At the position corresponding to the second corner hole on the second heat exchange plate, there is a second convex platform that bulges upward and has the same bulging height as the ridge portion thereon; at the corner corresponding to the outside of the second convex platform on the second heat exchange plate, there is a second communication portion that is recessed downward and has the same recessed depth as the groove portion thereon;

[0025] In the area where the first communication portion corresponds to and abuts against the second communication portion, there are at least one third balance hole arranged, and on the second communication portion, there are fourth balance holes corresponding one-to-one to the third balance holes;

[0026] The third balance holes and the corresponding fourth balance holes cooperate and communicate to form a fluid balance structure.

[0027] It is further set that: on the plate surface between the first convex platform and the second sunken platform of the first heat exchange plate, there is a bulging portion that bulges upward and has the same bulging height as the ridge portion thereon, and there is at least one fifth balance hole arranged on the bulging portion;

[0028] On the plate surface of the second heat exchange plate opposite to the first bulging portion, there is a recessed portion that is recessed downward and has the same recessed depth as the groove portion thereon, and there are sixth balance holes corresponding one-to-one to the fifth balance holes arranged on the recessed portion;

[0029] The bulging portion and the recessed portion abut against each other in the heat exchange side space, and the fifth balance holes and the sixth balance holes thereon cooperate to form a fluid balance structure for connecting adjacent refrigerant spaces.

[0030] It is further set that: the bulging portion on the first heat exchange plate is arranged at the edge corresponding to one end of the first corner hole.

[0031] It is further set that: when the plate heat exchanger is in use, the end where the first corner hole is located is at the lower side.

[0032] Compared with the prior art, the utility model has a simple and reasonable structure. It improves the available pressure difference of the refrigerant flowing into each refrigerant side space in the inlet channel through the fluid distribution structure to enhance the distribution uniformity, and cooperates with the fluid balance structure to connect adjacent refrigerant side spaces so that the pressures between the spaces are basically the same. In this way, not only the total flow resistance of the refrigerant side space is effectively reduced, but also the flow rate and pressure distribution among the refrigerant side spaces are more balanced, making the boiling surface in the refrigerant side space more uniform and effectively strengthening the heat transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. is a schematic diagram of the separation structure of a plate heat exchanger with fluid distribution function and fluid balance function according to the utility model;

[0034] Figure 2 is Figure 1 an enlarged schematic diagram of part A in FIG.

[0035] Figure 3 FIG. is a schematic cross-sectional structure of the plate heat exchanger corresponding to the first corner hole.

[0036] With reference to the attached drawings, the following reference numerals are marked thereon:

[0037] 1. First heat exchange plate; 11. First boss; 111. Groove enclosure; 1111. First groove; 112. First balance hole; 12. Second sunk platform; 13. First communication part; 131. Third balance hole; 14. Protrusion part; 141. Fifth balance hole; 2. Second heat exchange plate; 21. First sunk platform; 211. Ridge enclosure; 2111. Second groove; 212. Second balance hole; 22. Second boss; 23. Second communication part; 231. Fourth balance hole; 24. Depression part; 241. Sixth balance hole a. First corner hole; b. Second corner hole; c. Third corner hole; d. Fourth corner hole; e. Ridge part; f. Groove part; g. Flange; h. Refrigerant side space; i. Heat exchange side space; j. Inlet channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will describe in detail a specific embodiment of the utility model with reference to the attached drawings, but it should be understood that the protection scope of the utility model is not limited by the specific embodiment.

[0039] A plate heat exchanger with fluid distribution function and fluid balance function according to the utility model is as shown in Figure 1 and Figure 3As shown, it includes a first heat exchange plate 1 and a second heat exchange plate 2 which are alternately stacked from top to bottom. Both the first heat exchange plate 1 and the second heat exchange plate 2 are corrugated plate structures with ridges e and grooves f. Preferably, the corrugated patterns on the first heat exchange plate 1 and the second heat exchange plate 2 are in the form of a herringbone structure or a W-shaped structure. Among them, the groove f on the first heat exchange plate 1 and the ridge e on the adjacent lower second heat exchange plate 2 are supported and cooperated to form a refrigerant side space h for the refrigerant to flow. The groove f on the second heat exchange plate 2 and the ridge e on the adjacent lower first heat exchange plate 1 are supported and cooperated to form a heat exchange side space i for heat exchange media such as water to flow to exchange heat with the refrigerant in the refrigerant side space h. Such a structure makes the refrigerant side space h and the heat exchange side space i arranged alternately inside the plate heat exchanger.

[0040] In this embodiment, as Figure 1 shown, the first heat exchange plate 1 and the second heat exchange plate 2 are rectangular plate structures that are adapted to each other, and the edges of both plate bodies are provided with flanging g structures that are folded downwards for easy nesting with each other. At the four corners of the first heat exchange plate 1 and the second heat exchange plate 2, there are respectively arranged first corner holes a, second corner holes b, third corner holes c, and fourth corner holes d that are arranged oppositely. Among them, the first corner holes a and the second corner holes b are located at one end of the opposite length direction of the rectangular plate, and the third corner holes c and the fourth corner holes d are located at the other end of the opposite length direction of the rectangular plate. When the plate heat exchanger of this patent is installed and used, it is preferably that the end where the first corner hole a is located is at the lower part, so as to optimize heat transfer.

[0041] In this embodiment, as Figure 2 and Figure 3 shown, the first heat exchange plate 1 is provided with a first boss 11 that bulges upwards at the position corresponding to its first corner hole a, and the height of the bulge is the same as that of the ridge e on it. The second heat exchange plate 2 is provided with a first sink 21 that depresses downwards at the position corresponding to its first corner hole a, and the depth of the depression is the same as that of the groove f on it. Such a structure makes the first boss 11 and the first sink 21 supported and connected in the heat exchange side space i. At the position corresponding to the first corner hole a of the heat exchanger, an inlet channel j for the refrigerant to flow through the heat exchanger is formed, and the inlet channel j is blocked from the heat exchange side space i to limit the inflow of the refrigerant and is connected to the refrigerant side space h for the refrigerant to flow in. In the refrigerant side space h, a fluid distribution structure is formed between the first boss 11 of the first heat exchange plate 1 and the first sink 21 of the second heat exchange plate 2.

[0042] In the above solution, preferably, as Figure 2 and Figure 3As shown, at least one groove enclosure 111 that is downwardly recessed and has the same recess depth as the groove portion f thereon is provided corresponding to the outer side of the first corner hole a on the first convex platform 11 of the first heat exchange plate 1. The groove enclosure 111 independently encloses the first corner hole a or cooperates with the flanging g at the edge of the plate body to enclose the first corner hole a. In this embodiment, there are two groove enclosures 111, namely the first groove enclosure 111 circumferentially arranged on the outer side of the first corner hole a, and the second groove enclosure 111 arranged on the outer side of the first groove enclosure 111 and connected to the flanging g at the corner of the plate body to enclose the first groove enclosure 111; on the first sunken platform 21 of the second heat exchange plate 2, a ridge enclosure 211 that corresponds to the groove enclosure 111 one by one and has the same ridge height as the ridge portion e thereon is prominently provided. In this embodiment, there are also two ridge enclosures 211, namely the first ridge enclosure 211 that is opposite to the first groove enclosure 111 and circumferentially arranged on the outer side of the first corner hole a, and the second ridge enclosure 211 that is opposite to the first groove enclosure 111 and connected to the flanging g at the corner of the plate body to enclose the first ridge enclosure 211; in the refrigerant side space h, the opposite groove enclosure 111 and ridge enclosure 211 are supported and connected to form a blocking structure that blocks the space into two inner and outer spaces. Each blocking structure is constructed and provided with at least one liquid inlet channel that communicates the inner and outer spaces; specifically, at least one first groove 1111 is provided on the bottom surface of each groove enclosure 111, and a second groove 2111 that cooperates with the first groove 1111 is correspondingly provided on the top surface of each ridge enclosure 211. In this way, when the bottom surface of the groove enclosure 111 and the top surface of the ridge enclosure 211 are abutted and connected, the first groove 1111 and the second groove 2111 can be aligned to form a liquid inlet channel; preferably, the liquid inlet channel on the blocking structure is a gradually expanding structure with a caliber (flow cross-section) that gradually increases along the flow direction; the fluid distribution structure designed in this way can effectively increase the available pressure of the refrigerant flowing from the inlet channel j into the refrigerant side space h, improve the fluid distribution uniformity, and reduce the flow resistance.

[0043] In this embodiment, at least one fluid balance structure that communicates with adjacent refrigerant side spaces h is also constructed and provided at a position where the pressure potential energy of the refrigerant side space h is relatively less than 50% of the total energy. In this way, by passing through all the refrigerant side spaces h through the fluid balance structure at a specific position, the refrigerant can achieve pressure and flow balance at this position, thus ensuring the uniformity of the refrigerant flow distribution in each refrigerant side space h, and further balancing the boiling surfaces in each refrigerant side space h, improving the heat transfer effect; specifically, compared with a plate heat exchanger without a fluid balance structure, its heat transfer performance is improved by more than 30%.

[0044] In this embodiment, as Figure 2As shown, at least one first balance hole 112 is provided on the first boss 11 outside the corresponding groove enclosure 111 of the first heat exchange plate 1, and a second balance hole 212 corresponding to the first balance hole 112 is provided on the first counterbore 21 of the second heat exchange plate 2; in the heat exchange side space i, the first boss 11 and the first counterbore 21 are abutted against each other, and the first balance hole 112 and the second balance hole 212 arranged oppositely thereon are communicated to form a first fluid balance structure; specifically, the first balance hole 112 is provided on the first boss 11 between the first groove enclosure 111 and the second ridge enclosure 211, and preferably the first balance hole 112 is arranged corresponding to the corner edge near the liquid inlet channel.

[0045] In this embodiment, as Figure 2 shown, the first heat exchange plate 1 is provided with a second counterbore 12 that is recessed downward at the corresponding second corner hole b and has the same recessed depth as the groove portion f thereon, and a first communication portion 13 that bulges upward at the corner outside the second counterbore 12 of the first heat exchange plate 1 and has the same bulging height as the ridge portion e thereon; the second heat exchange plate 2 is provided with a second boss 22 that bulges upward at the corresponding second corner hole b and has the same bulging height as the ridge portion e thereon, and a second communication portion 23 that is recessed downward at the corner outside the second boss 22 of the second heat exchange plate 2 and has the same recessed depth as the groove portion f thereon; at least one third balance hole 131 is provided in the area where the first communication portion 13 abuts against the second communication portion 23 correspondingly, and a fourth balance hole 231 corresponding to the third balance hole 131 is provided on the second communication portion 23; the first communication portion 13 and the second communication portion 23 are abutted against each other in the heat exchange side space i, and the third balance hole 131 and the corresponding fourth balance hole 231 arranged oppositely thereon are cooperatively communicated to form a second fluid balance structure, further balancing the flow rate and pressure in each refrigerant side space h.

[0046] In this embodiment, as Figure 2As shown, on the surface of the first heat exchange plate 1 corresponding to the plate surface between the first boss 11 and the second sunk platform 12, a raised portion 14 is constructed and arranged to bulge upward with a bulge height the same as the ridge portion e thereon. At least one fifth balance hole 141 is provided on the raised portion 14; on the plate surface of the second heat exchange plate 2 opposite to the first raised portion 14, a sunken portion 24 is provided to sink downward with a sunken depth the same as the groove portion f thereon. A sixth balance hole 241 corresponding to the fifth balance hole 141 one by one is provided on the sunken portion 24; the raised portion 14 and the sunken portion 24 are abutted against each other in the heat exchange side space i, and the fifth balance hole 141 and the sixth balance hole 241 arranged oppositely thereon cooperate to form a third fluid balance structure connecting adjacent refrigerant spaces; preferably, the raised portion 14 is correspondingly arranged at the edge of the end of the first heat exchange plate 1 where the first corner hole a is located and is closely arranged adjacent to the second groove enclosure 111, so as to construct such that the liquid inlet channel formed by the cooperation of the first groove 1111 of the second groove enclosure 111 and the second groove 2111 of the second ridge enclosure 211 directly communicates with the space formed by the cooperation of the raised portion 14 and the sunken portion in the refrigerant side space h, thereby further optimizing the balanced distribution of the flow rate and pressure among the refrigerant side spaces h.

[0047] Compared with the prior art, the structure of the present utility model is simple and reasonable. It improves the available pressure difference of the refrigerant flowing into each refrigerant side space in the inlet channel through the fluid distribution structure to improve the distribution uniformity, and cooperates with the fluid balance structure to connect adjacent refrigerant side spaces so that the pressures among the spaces are basically the same. In this way, not only the total flow resistance of the refrigerant side space is effectively reduced, but also the flow rate and pressure distribution among the refrigerant side spaces are more balanced, the boiling surface in the refrigerant side space is more uniform, and the heat transfer effect is effectively enhanced.

[0048] The above-disclosed are only the embodiments of the present utility model. However, the present utility model is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A plate heat exchanger having a fluid distribution function and a fluid balance function, comprising: A first heat exchange plate and a second heat exchange plate alternately stacked from top to bottom. Both the first heat exchange plate and the second heat exchange plate are corrugated plate structures having a ridge portion and a groove portion. The first heat exchange plate and the second heat exchange plate are both provided with a first corner hole, a second corner hole, a third corner hole, and a fourth corner hole arranged oppositely, and an inlet passage for refrigerant to pass through the heat exchanger is defined at the position corresponding to the first corner hole; A refrigerant side space for the refrigerant to flow. Each refrigerant side space is supported and cooperated by the groove portion on the first heat exchange plate and the ridge portion on the adjacent second heat exchange plate below; A heat exchange side space for the heat exchange medium to flow. Each heat exchange side space is supported and cooperated by the groove portion on the second heat exchange plate and the ridge portion on the adjacent first heat exchange plate below; Wherein the refrigerant side space and the heat exchange side space are alternately arranged; It is characterized in that at the position corresponding to the first corner hole on each first heat exchange plate, there is a first boss that bulges upward and has the same height as the ridge portion thereon. At the position corresponding to the first corner hole on each second heat exchange plate, there is a first sunk platform that sinks downward and has the same depth as the groove portion thereon; In the heat exchange side space, the first sunk platform on the second heat exchange plate is supported and connected to the first boss on the first heat exchange plate to limit the refrigerant in the inlet passage from flowing in; In the refrigerant side space, a fluid distribution structure for the refrigerant in the inlet passage to flow into the refrigerant side space is formed at the positions corresponding to the first boss of the first heat exchange plate and the first sunk platform of the second heat exchange plate; At least one fluid balance structure for connecting adjacent refrigerant side spaces is constructed and arranged at a position in each refrigerant side space where the pressure potential energy relative to the total energy is less than 50%; 2. The plate heat exchanger with fluid distribution function and fluid balance function according to claim 1, characterized in that, At least one groove enclosure that sinks downward and has the same depth as the groove portion thereon is arranged outside the first corner hole corresponding to the first boss of the first heat exchange plate; On the first sunk platform of the second heat exchange plate, there are ridge enclosures that bulge upward and correspond to the groove enclosures one by one and have the same height as the ridge portion thereon; In the refrigerant side space, the groove enclosure and the ridge enclosure are correspondingly supported and connected to partition the space between the first boss and the first sunk platform into at least two. At least one liquid inlet passage for connecting adjacent spaces is arranged on the partition structure formed by the corresponding connection of the groove enclosure and the ridge enclosure; 3. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 2, characterized in that, At least one first groove is arranged on the bottom surface of each groove enclosure; Correspondingly, a second groove that cooperates with the first groove is arranged on the top surface of each ridge enclosure. The first groove and the second groove are aligned to form a liquid inlet passage; 4. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 2 or 3, characterized in that, The liquid inlet passage is a gradually expanding structure with a caliber gradually increasing along the flow direction; 5. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 2, characterized in that, At least one first balance hole is arranged on the first boss of the first heat exchange plate corresponding to the outside of the groove enclosure; Correspondingly, a second balance hole is arranged on the first sunk platform of the second heat exchange plate corresponding to the first balance hole one by one; The first balance hole and the second balance hole are cooperated and connected to form a fluid balance structure; 6. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 1, characterized in that, Both the first heat exchange plate and the second heat exchange plate are rectangular plate structures, wherein the first corner hole and the second corner hole are respectively arranged at two corners at the same end of the relative length direction of the plate; At the position corresponding to the second corner hole on the first heat exchange plate, there is a second sunken platform that is sunken downward and has the same sunken depth as the groove portion thereon. At the corner outside the second sunken platform on the first heat exchange plate, there is a first communication portion that bulges upward and has the same bulging height as the ridge portion thereon; At the position corresponding to the second corner hole on the second heat exchange plate, there is a second convex platform that bulges upward and has the same bulging height as the ridge portion thereon. At the corner outside the second convex platform on the second heat exchange plate, there is a second communication portion that is sunken downward and has the same sunken depth as the groove portion thereon; At least one third balance hole is provided in the area of the first communication portion corresponding to the area in contact with the second communication portion. On the second communication portion, there are fourth balance holes corresponding one by one to the third balance holes; The third balance hole and the corresponding fourth balance hole cooperate to communicate to form a fluid balance structure.

7. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 6, characterized in that, On the plate surface between the first convex platform and the second sunken platform on the first heat exchange plate, there is a bulging portion that bulges upward and has the same bulging height as the ridge portion thereon. At least one fifth balance hole is provided on the bulging portion; On the plate surface of the second heat exchange plate opposite to the first bulging portion, there is a sunken portion that is sunken downward and has the same sunken depth as the groove portion thereon. On the sunken portion, there are sixth balance holes corresponding one by one to the fifth balance holes; The bulging portion and the sunken portion are in contact with each other in the heat exchange side space, and the fifth balance hole and the sixth balance hole thereon cooperate to form a fluid balance structure that communicates with the adjacent refrigerant spaces.

8. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 7, characterized in that, The bulging portion on the first heat exchange plate is provided at the edge corresponding to one end of the first corner hole.

9. A plate heat exchanger having a fluid distribution function and a fluid balance function according to claim 6, characterized in that, When the plate heat exchanger is in use, the end where the first corner hole is located is at the lower side.

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