Plate heat exchanger

Abstract

The application provides a plate heat exchanger, comprising a plurality of heat exchange plate groups, the plurality of heat exchange plate groups are stacked along the thickness direction of the plate heat exchanger, the plate heat exchanger has at least one first inter-plate channel, the first inter-plate channel is located between adjacent heat exchange plate groups, the heat exchange plate group has a second inter-plate channel, the heat exchange plate group has a first hole, the first hole is close to the edge of the heat exchange plate group, the plate heat exchanger comprises a stop part, the stop part is located on the circumferential side of the first hole, the stop part has a stop edge, the stop edge is connected with the edge of the heat exchange plate group on the side of the first hole, the first hole is used for flowing in refrigerant, and the first inter-plate channel is used for flowing through refrigerant. According to the application, the stop part is arranged on the circumferential side of the first hole for flowing in refrigerant, the stop edge of the stop part is connected with the edge of the heat exchange plate group on the side of the first hole, the flow of fluid in the second inter-plate channel to the space between the first hole and the edge on the side is prevented, the low temperature of the refrigerant caused by the flow is prevented from causing ice formation, and the ice formation is reduced.

Description

Technical Field

[0001] This invention belongs to the field of heat exchangers, specifically, it relates to a plate heat exchanger. Background Technology

[0002] Plate heat exchangers are widely used in refrigeration and heating systems as evaporators, condensers, economizers, etc., due to their advantages such as compact structure, high heat transfer coefficient, high reliability, and low refrigerant charge.

[0003] The refrigerant inlet temperature of a plate heat exchanger is usually relatively low. During the heat exchange process, the liquid (such as water) that exchanges heat with the refrigerant near the inlet can easily freeze. The volume expansion caused by freezing can easily cause the plate heat exchanger to crack and be damaged, making it unable to be used normally. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a plate heat exchanger that reduces the occurrence of freezing.

[0005] This invention provides a plate heat exchanger, comprising multiple heat exchange plate groups stacked along the thickness direction of the plate heat exchanger. The plate heat exchanger has at least one first inter-plate channel located between adjacent heat exchange plate groups. Each heat exchange plate group has a second inter-plate channel and a first passage. The first passage communicates with the first inter-plate channel, but is not communicated with the second inter-plate channel. The first inter-plate channel is also not communicated with the second inter-plate channel.

[0006] The first channel is close to the edge of the heat exchange plate assembly. The plate heat exchanger includes a stop portion located on the periphery of the first channel. The stop portion has a stop edge, which is connected to the edge of the heat exchange plate assembly next to the first channel.

[0007] The first channel is for refrigerant to flow in, and the first inter-plate channel is for refrigerant to circulate.

[0008] The plate heat exchanger provided by the present invention provides a stop portion on the periphery of the first channel into which the refrigerant flows. The stop portion is connected to the edge of the heat exchange plate assembly on the side of the first channel. This prevents the fluid in the second plate channel from flowing between the first channel and the edge on the side, which would cause the refrigerant to freeze due to low temperature. This reduces the occurrence of freezing. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a plate heat exchanger provided in an embodiment of the present invention;

[0011] Figure 2 This is an exploded view of a plate heat exchanger provided in an embodiment of the present invention;

[0012] Figure 3 This is a partial structural schematic diagram of the plate heat exchanger in an embodiment of the present invention;

[0013] Figure 4 This is a partial cross-sectional schematic diagram of a plate heat exchanger in an embodiment of the present invention;

[0014] Figure 5 for Figure 4 A magnified view of part A in the middle;

[0015] Figure 6 for Figure 4 Schematic diagram of the B-direction structure;

[0016] Figure 7 This is a front view of the heat exchange plate assembly in an embodiment of the present invention;

[0017] Figure 8 This is an exploded view of the heat exchanger plate assembly in an embodiment of the present invention;

[0018] Figure 9 This is an exploded view of the heat exchanger plate assembly in an embodiment of the present invention;

[0019] Figure 10 for Figure 7 A magnified view of part C in the middle;

[0020] Figure 11 This is a partial cross-sectional schematic diagram of a plate heat exchanger according to an embodiment of the present invention;

[0021] Figure 12 This is a schematic diagram illustrating the cooperation between the heat exchange plate assembly and the distributor in an embodiment of the present invention;

[0022] Figures 13a to 13d This is a schematic diagram of different structures for the buckle in the distributor in an embodiment of the present invention;

[0023] Figures 14a to 14c Schematic diagrams of different structures for the snap fasteners in the heat exchange plate assembly of this invention;

[0024] Figure 15a This is a schematic diagram of the C-type buckle structure of the distributor in an embodiment of the present invention;

[0025] Figure 15b This is a schematic diagram of the C-type clip structure of the heat exchange plate assembly in an embodiment of the present invention;

[0026] Figure 16 This is a partial structural schematic diagram of a plate heat exchanger according to an embodiment of the present invention;

[0027] Figures 17a to 17b These are schematic diagrams illustrating different structures of the distributor in embodiments of the present invention;

[0028] Figure 18 This is a schematic diagram of the engagement of the buckle and the slot in an embodiment of the present invention;

[0029] Figure 19 This is a schematic diagram of another structure of the distributor in an embodiment of the present invention;

[0030] Figure 20 This is a schematic diagram of the distribution section located in the heat exchange plate assembly structure in an embodiment of the present invention;

[0031] Figure 21 This is a schematic diagram of another structure of the heat exchange plate assembly in an embodiment of the present invention. Detailed Implementation

[0032] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] like Figures 1 to 7 As shown, this embodiment provides a plate heat exchanger including multiple heat exchange plate groups 1, which are arranged along the thickness direction of the plate heat exchanger (e.g., ...). Figure 2Stacked (in the x-direction indicated by the middle arrow), the plate heat exchanger has at least one first inter-plate channel 3 located between adjacent heat exchange plate groups 1. Each heat exchange plate group 1 has a second inter-plate channel 5. Each heat exchange plate group 1 has a first channel 11 connected to the first inter-plate channel 3 but not connected to the second inter-plate channel 5. The heat exchange plate group 1 also has a second channel 12 connected to the first inter-plate channel 3, and the second channels 12 of adjacent heat exchange plate groups 1 are connected. The first channel 11 is for refrigerant inflow, the first inter-plate channel 3 is for refrigerant flow, and the second inter-plate channel 5 is for liquid flow. In actual use, the liquid in the second inter-plate channel 5 exchanges heat with the refrigerant in the first inter-plate channel 3. The liquid after heat exchange is used for daily purposes and is typically water.

[0035] In actual heat exchange applications, the relatively low-temperature refrigerant flows into the first interplate channel 3 from the first channel 11, then flows to the second channel 12 and flows out from the second channel 12. During the flow of the refrigerant in the first interplate channel 3, it exchanges heat with the water in the second interplate channel 5. To achieve better heat exchange performance, corner holes are typically located at the corners of the heat exchange plates. However, because the refrigerant entering from the first hole 11 is at a lower temperature, the temperature around the first hole 11 will also be lower. If the plate heat exchanger is not designed to prevent freezing, the temperature around the second interplate channel 5 will be low. When water flows through the second interplate channel 5 to the area around the first hole 11, especially since the space between the first hole 11 and the corner edge is small, the fluid in the second interplate channel 5 will cause congestion and accumulation. Due to the continuous low temperature of the first hole 11, the water in this area is prone to freezing. Freezing causes volume expansion, which can deform the plate heat exchanger in this part, and may even cause problems such as cracking, tearing, and weld separation in this part, affecting the normal use of the plate heat exchanger.

[0036] Therefore, this embodiment incorporates an anti-freezing design for the plate heat exchanger. For details, please refer to [link / reference needed]. Figure 5 , Figure 8 and combined Figure 3 and Figure 7 The plate heat exchanger includes a stop portion 6, which is located around the periphery of the first channel 11, near the edge of the heat exchange plate assembly 1. The plate heat exchanger includes a stop portion 6, which has a stop edge 6a (e.g., Figure 7 and Figure 8 (As shown by the dashed line in the middle), the stop edge 6a is connected to the edge of the heat exchange plate group 1 on the side of the first channel 11; the first channel 11 is for refrigerant to flow in, and the first inter-plate channel 3 is for refrigerant to circulate.

[0037] Specifically, the stop edge 6a is located between the first channel 11 and the second inter-plate channel 5. Please refer again. Figure 7 Viewed from the front of the plate heat exchanger, the heat exchange plate assembly 1 is rectangular with rounded corners. The heat exchange plate assembly 1 includes two long sides 1c and two short sides 1d. The first channel 11 is located at one corner of the heat exchange plate assembly 1. A stop portion 6 connects to the adjacent long side 1c of the first channel 11 and to the adjacent short side 1d of the first channel 11. Further, one end of the stop edge 6a connects to the adjacent long side 1c of the first channel 11, and the other end connects to the adjacent short side 1d of the first channel 11. There is a gap between the stop edge 6a and the inner edge of the first channel 11, and the stop edge 6a is adjacent to the second inter-plate channel 5. The first channel 11 and the second channel 12 can be distributed along one of the long sides 1c, or they can be distributed diagonally opposite each other. The first channel 11 is located at one corner of the heat exchange plate assembly 1. One end of the stop edge 6a along its length direction is connected to the long side 1c near the corner, and the other end is connected to the short side 1d near the corner. In this embodiment, viewed from the front of the heat exchange plate assembly 1, the first channel 11 is located at the corner in the third quadrant of the heat exchange plate assembly 1, and the second channel 12 is located at the corner in the second quadrant of the heat exchange plate assembly 1.

[0038] In this embodiment, a stop edge 6a is provided between the first channel 11 and the second interplate channel 5. In addition to preventing water in the second interplate channel 5 from approaching the first channel 11, the stop edge 6a can also prevent water in the second interplate channel 5 from flowing into the corners around the first channel 11 and accumulating, thereby reducing the freezing of water due to the low temperature of the refrigerant near the first channel 11. This can reduce the occurrence of freezing in the plate heat exchanger and thus help extend the service life of the plate heat exchanger.

[0039] In this embodiment, the distance between the stop edge 6a and the inner edge of the first channel 11 is at least 2mm, such as 2mm, 2.5mm, 2.7mm, 3mm, 3.5mm, 4mm, 5mm, 7mm, 8mm, etc. The distance between the stop edge 6a and the inner edge of the first channel 11 is selected according to the usage requirements of the heat exchanger. In addition, the distance between the stop edge 6a and the inner edge of the first channel 11 is at least 2mm, which can also ensure the connection strength of the first heat exchange plate 15 and the second heat exchange plate 16 at the first channel 11.

[0040] For more details, please refer to [link / reference] again. Figure 8 The heat exchange plate group 1 includes a first heat exchange plate 15 and a second heat exchange plate 16. The first heat exchange plate 15 and the second heat exchange plate 16 are stacked, that is, the entire plate heat exchanger is formed by alternating stacking of the first heat exchange plate 15 and the second heat exchange plate 16.

[0041] like Figure 8In one embodiment, the stop portion 6 includes a stop platform 61 that protrudes toward the second inter-plate channel 5. The stop platform 61 is located at at least one of the first heat exchange plate 15 and the second heat exchange plate 16. When the stop platform 61 is located on the first heat exchange plate 15, the stop platform 61 protrudes toward the second heat exchange plate 16, and the stop platform 61 of the first heat exchange plate 15 is in contact with the second heat exchange plate 16. When the stop platform 61 is located on the second heat exchange plate 16, the stop platform 61 protrudes toward the first heat exchange plate 15, and the stop platform 61 of the second heat exchange plate 16 is in contact with the first heat exchange plate 15. When both the first heat exchange plate 15 and the second heat exchange plate 16 have stop platforms 61, the stop platform 61 protrudes toward the adjacent stop platform 61, and the stop platform 61 of the first heat exchange plate 15 is in contact with the stop platform 61 of the second heat exchange plate 16. Furthermore, the stop plate 61 is part of the first heat exchange plate 15 or the second heat exchange plate 16. The stop plate 61 and the first heat exchange plate 15 or the second heat exchange plate 16 are integral structures. The stop plate 61 is pressed and formed during the production and processing of the first heat exchange plate 15 or the second heat exchange plate 16. The wall thickness of the stop plate 61 is the same as the plate thickness of the first heat exchange plate 15 or the second heat exchange plate 16. The inner edge of the stop plate 61 is connected to the inner edge of the first channel 11. The outer edge of the stop plate 61 near the second inter-plate channel 5 is the stop edge 6a. The stop plate 61 separates the first channel 11 and the second inter-plate channel 5. The surfaces where the stop plate 61 connects with the first heat exchange plate 15, or the second heat exchange plate 16, or the surfaces where the stop plate 61 connects with the first heat exchange plate 15, or the second heat exchange plate 16, or the surfaces where the stop plate 61 connects with the first heat exchange plate 15, are all planes. Through plane connection, when adjacent first heat exchange plates 15 or second heat exchange plates 16 are connected, the solder can be fully melted between the planes, reducing the problem of incomplete soldering and improving the connection strength. In this embodiment, the first heat exchange plate 15 or the second heat exchange plate 16 are connected as one piece by brazing. Before brazing, copper foil is laid between the first heat exchange plate 15 or the second heat exchange plate 16. During brazing, the copper foil is melted between the first heat exchange plate 15 or the second heat exchange plate 16 by high temperature, so that the two are connected as one piece.

[0042] like Figure 9 In another embodiment, the stop portion 6 includes a stop strip 62 located between the first heat exchange plate 15 and the second heat exchange plate 16 of the heat exchange plate assembly 1. Along the thickness direction of the plate heat exchanger, one end of the stop strip 62 is connected to the first heat exchange plate 15, and the other end is connected to the second heat exchange plate 16. The end face of the stop strip 62 along the thickness direction of the plate heat exchanger is a plane, and the connection surface of the first heat exchange plate 15 and the second heat exchange plate 16 connected to the stop strip 62 is also a plane. In this embodiment, the side of the stop strip 62 near the second inter-plate channel 5 is a stop edge 6a. By setting the stop strip 62 and the first heat exchange plate 15 and the second heat exchange plate 16 as a planar connection, the ease of connection is improved. Similarly, a planar connection can increase the contact area and improve the connection strength.

[0043] In another embodiment, the stop portion 6 includes both a stop platform 61 and a stop bar 62 (not shown in the figure). The arrangement of the stop platform 61 and the stop bar 62 is the same as in the above embodiment, and will not be described in detail here.

[0044] Please refer to it again. Figure 7 The heat exchanger assembly 1 also has a third channel 13 and a fourth channel 14, both of which are connected to the second inter-plate channel 5 within the heat exchanger assembly 1. The third channels 13 of adjacent heat exchanger assemblies 1 are connected, and the fourth channels 14 of adjacent heat exchanger assemblies 1 are connected. When the first channel 11 and the second channel 12 are distributed along one of the long sides 1c, the third channel 13 and the fourth channel 14 are distributed along the other long side 1c. When the third channel 13 and the fourth channel 14 are diagonally distributed, the first channel 11 and the second channel 12 are also diagonally distributed. Water flows into the second inter-plate channel 5 of the heat exchanger assembly 1 through one of the third channel 13 and the fourth channel 14, and water flows out of the second inter-plate channel 5 of the heat exchanger assembly 1 through the other. In this embodiment, the third channel 13 and the fourth channel 14 are located at the corners of the first and fourth quadrants of the heat exchange plate assembly 1, respectively. Water flows into the third channel 13 and flows out of the fourth channel 14. After entering the second inter-plate channel 5 from the third channel 13, the water will not continue to approach the first channel 11 when it reaches the stop edge 6a, thereby reducing the possibility of icing caused by the low temperature of the refrigerant in the first channel 11. The water can flow along the stop edge 6a to the fourth channel 14 and finally flow out of the second inter-plate channel 5 from the fourth channel 14. Of course, the first channel 11 and the second channel 12 can also be diagonally distributed, in which case the third channel 13 and the fourth channel 14 are also diagonally distributed, but not shown in the figure.

[0045] Please refer to it again. Figure 8 and Figure 9 In the above embodiment, the heat exchange plate assembly 1 also has a sealing part 7. The sealing part 7 is provided on the periphery of either the third channel 13 or the fourth channel 14, and the sealing part 7 is located at the corner where the long side 1c and the short side 1d are connected. By sealing the corner of the heat exchange plate assembly 1 around the third channel 13 or the fourth channel 14 with the sealing part 7, the structural strength of the heat exchange plate assembly 1 at the corner of the third channel 13 or the fourth channel 14 is improved. In this embodiment, it is preferable to provide the sealing part 7 at the corner around the fourth channel 14. Since the fourth channel 14 and the first channel 11 are distributed along the short side 1d and are relatively close to the first channel 11, in actual use, the low-temperature refrigerant in the first channel 11 may also affect the water at this corner and cause it to freeze. Freezing will damage the structural performance of the plate heat exchanger. Therefore, providing the sealing part 7 at the corner around the fourth channel 14 can also improve the anti-freezing performance of the entire plate heat exchanger.

[0046] like Figure 8As shown, in one embodiment, the sealing part 7 includes a protrusion 71 located at at least one of the first heat exchange plate 15 and the second heat exchange plate 16. The protrusion 71 protrudes towards the second inter-plate channel 5. The inner edge of the protrusion 71 is connected to the inner edge of the third channel 13 or the fourth channel 14, and the outer edge of the protrusion 71 is connected to the long side 1c and the short side 1d of the corresponding quadrant. When the protrusion 71 is located on the first heat exchange plate 15, the protrusion 71 of the first heat exchange plate 15 is connected to the second heat exchange plate 16; when the protrusion 71 is located on the second heat exchange plate 16, the protrusion 71 of the second heat exchange plate 16 is connected to the first heat exchange plate 15; when both the first heat exchange plate 15 and the second heat exchange plate 16 have protrusions 71, the protrusion 71 of the first heat exchange plate 15 is connected to the protrusion 71 of the second heat exchange plate 16. In this embodiment, the protrusion 71 is part of the first heat exchange plate 15 or the second heat exchange plate 16. The protrusion 71 and the first heat exchange plate 15 are integrally formed, or the protrusion 71 and the second heat exchange plate 16 are integrally formed. The protrusion 71 is pressed during the manufacturing process of the first heat exchange plate 15 or the second heat exchange plate 16, and the wall thickness of the protrusion 71 is the same as the plate thickness of the first heat exchange plate 15 or the second heat exchange plate 16. Furthermore, the contact surface between the protrusion 71 and the first heat exchange plate 15, or the contact surface between the protrusion 71 and the second heat exchange plate 16, or the contact surface between protrusions 71, are all planar. This planar design facilitates connection and ensures connection strength, reducing the risk of incomplete soldering.

[0047] like Figure 9 As shown, in another embodiment, the sealing part 7 includes a plug 72, which is located between the first heat exchange plate 15 and the second heat exchange plate 16 of the heat exchange plate assembly 1. The plug 72 is a separate structure from the first heat exchange plate 15 and the second heat exchange plate 16. During assembly, the plug 72 is placed at the corresponding corner. The connection between the plug 72 and the first heat exchange plate 15 and the second heat exchange plate 16 is not specifically limited and can be achieved by brazing with copper. Along the thickness direction of the plate heat exchanger, one end of the plug 72 is connected to the first heat exchange plate 15, and the other end is connected to the second heat exchange plate 16. The end face of the plug 72 is flat, and the contact surfaces of the first heat exchange plate 15 and the second heat exchange plate 16 with the plug 72 are also flat. This flat arrangement facilitates connection and ensures connection strength.

[0048] In another embodiment, the sealing part 7 includes both a protrusion 71 and a plug 72 (not shown in the figure). The arrangement of the protrusion 71 and the plug 72 is the same as in the above embodiment, and will not be described in detail here.

[0049] Please refer to it again. Figure 7 and combined Figure 10In the above embodiment, the connection point between the stop edge 6a and the long side 1c is O1, and the connection point between the stop edge 6a and the short side 1d is O2. Along the line direction from O1 to O2, the vertical distance from the point on the stop edge 6a to the connected short side 1d decreases, reducing the water trap formed at the stop edge 6a in the second inter-plate channel 5. This allows water in the second inter-plate channel 5 to flow smoothly along the stop edge 6a, avoiding accumulation and further reducing the risk of freezing. Furthermore, a section of the stop edge 6a near the connection point O1 forms a first angle with the connected long side 1c. The first angle is located on the side of the stop edge 6a near the first hole 11 and is an acute angle, causing the stop edge 6a to extend towards the fourth hole 14, which helps guide water to the fourth hole 14. Furthermore, the angle of the first included angle is α, where 10°≤α≤45°, for example, 10°≤α≤30°; further still, the section of the stop edge 6a near the connection point O2 forms a second included angle with the connected short side 1d. The second included angle is located on the side of the stop edge 6a near the first channel 11, and the angle of the second included angle is β, where 0°<β≤90°, for example, 70°≤β≤90°. This design reduces the heat exchange area occupied by the stop part 6, ensuring the heat exchange effect, while also having an anti-freezing effect.

[0050] Please see Figure 8 and Figure 9 and combined Figure 11 In the above embodiment, the first heat exchange plate 15 has a first corrugation, and the second heat exchange plate 16 has a second corrugation. The first and second corrugations extend to the stop edge 6a. The corrugation angles of the first and second corrugations are opposite, and the corrugation angles of the first and second corrugations can be the same or different. The first corrugation includes a first peak 15a and a first trough 15b. The second heat exchange plate 16 has a second corrugation, which includes a second peak 16a and a second trough 16b. In the same heat exchange plate group 1, the first trough 15b is connected to the second peak 16a. In adjacent heat exchange plate groups 1, the second trough 16b is connected to the first peak 15a. The first peak 15a and the second peak 16a have the same height. The first and second corrugations are connected. Through the corrugation, the refrigerant and water form turbulence in their respective inter-plate channels, thereby enhancing the heat transfer effect and preventing scale formation on the plates, facilitating daily maintenance. Please refer again. Figure 10In this embodiment, the second corrugation also includes a ridge 16c, the height of which is less than the height of the second wave peak 16a. That is, one side of the same inter-plate channel is a symmetrical heat exchange plate with the same peak height, and the other side is an asymmetrical heat exchange plate with different peak heights. Using a single-sided asymmetrical heat exchange plate will not cause the volume difference between the two to be too large, thus affecting the heat exchange performance. At the same time, it makes the volumes of the first inter-plate channel 3 and the second inter-plate channel 5 different. The volume of the second inter-plate channel 5 is smaller than that of the first inter-plate channel 3. The pressure drop of the second inter-plate channel 5 increases, which increases the turbulence of the medium fluid and improves the heat transfer effect of the medium inside the heat exchanger, thereby improving the heat exchange performance. Since the volume of the first inter-plate channel 3 is larger, the flow pressure drop of the medium decreases significantly, which slows down the turbulence and can be used to flow high-pressure refrigerant to improve the heat exchange performance, thereby improving the heat exchange efficiency of the plate heat exchanger. In this embodiment, there is at least one ridge 16c between adjacent second peaks 16a, and at least one second peak 16a between adjacent ridges 16c. The arrangement of the ridges 16c and the second peaks 16a can be selected according to requirements. In addition, there is no specific limitation on the number of first and second ripples, and single herringbone waves, double herringbone waves, or multiple herringbone waves can be selected as needed.

[0051] Please refer to it again. Figure 2 and combined Figure 5 , Figure 6 , Figures 12 to 19 In the above embodiments, when the plate heat exchanger is used as an evaporator, it further includes a distribution section to increase pressure drop and improve distribution efficiency. The distribution section is separate from the heat exchange plate group 1. The distribution section includes a distributor 2, which is positioned between adjacent heat exchange plate groups 1. The distributor 2 is at least partially located in the first inter-plate channel 3. The distributor 2 has at least one distribution hole 20, which communicates with the first inter-plate channel 3. The distributor 2 also has a through hole 21, which communicates with the distribution hole 20, and the first channel 11 communicates with the through hole 21. In practical applications, the refrigerant enters the through hole 21 of the distributor 2 from the first channel 11, and then enters the first inter-plate channel 3 from the distribution hole 20, thus improving distribution performance. In this embodiment, the distributor 2 and the heat exchange plate assembly 1 are separate structures. The distributor 2 can be installed or not depending on the application requirements of the plate heat exchanger. When the plate heat exchanger is used as a condenser, there is no need to assemble the distributor 2. When the plate heat exchanger is used as an evaporator, the distributor 2 can be installed during the assembly process. That is, the same heat exchange plate assembly 1 can be equipped with a distributor 2 as needed to realize both evaporator and condenser applications.

[0052] The distributor 2 and the heat exchange plate assembly 1 are separate structures. To facilitate rapid positioning during assembly and improve the assembly efficiency of the distributor 2, this embodiment incorporates a positioning design for the plate heat exchanger. The plate heat exchanger includes at least one first positioning part 4a and a second positioning part 4b, which cooperate with each other. The first positioning part 4a is connected to the inner edge of the through hole 21 or to the inner edge of the first channel 11. Please refer to [link / reference]. Figures 12 to 19 The first positioning part 4a includes a buckle. At least one of the inner edges of the heat exchange plate assembly 1 at the first channel 11 and the inner edge of the distributor 2 at the through hole 21 is provided with a buckle. In this embodiment, by setting the buckle on the inner edge of the through hole 21 or the first channel 11, a certain operating space is provided. During assembly, this operating space can be fully utilized for bending and other operations, making operation simple and convenient while achieving the positioning effect of the distributor 2. In this embodiment, viewed along the thickness direction of the plate heat exchanger, the cross-section of the buckle is arc-shaped, adapting to the inner edge of the through hole 21 or the inner edge of the first channel 11.

[0053] like Figure 12 , Figures 13a to 13d As shown, in one embodiment, in at least one radial direction of the through hole 21, the latch located on the distributor 2 is at least partially opposite to the adjacent heat exchange plate assembly 1. Further, the latch located on the distributor 2 is connected to the inner wall of the through hole 21; that is, when the latch is provided on the distributor 2, the latch is connected to the inner wall of the through hole 21. When assembling the distributor 2, the latch and the radial wall surface of the first channel 11 of the heat exchange plate assembly 1 are opposite to each other in at least one radial direction of the through hole 21. In this embodiment, the end of the distributor 2 may extend in a direction away from the axis of the through hole 21 (i.e., extend outwards), such as... Figure 13a and Figure 13b As shown, the clips can be connected by methods such as adhesive bonding, welding, or hot-melt connection; the end of the distributor 2 can also extend towards the axis of the through hole 21 (i.e., extend inward), as shown. Figure 13c and Figure 13d As shown, at this time, the clip can be connected to the distributor 2 by means of bonding, welding, hot melt connection, etc., or it can be integrated with the distributor 2. That is, the clip strip is formed together during the production and processing of the distributor 2, and then the clip can be formed by bending. This can eliminate the assembly steps of the split clip, which helps to improve the assembly efficiency of the entire plate heat exchanger. The distributor 2 can be provided with a clip at one end along the thickness direction of the plate heat exchanger, or it can be provided at both ends.

[0054] like Figure 12 , Figures 14a to 14cAs shown, in another embodiment, the latch located on the heat exchange plate assembly 1 is at least partially opposite to the distributor 2. Furthermore, the latch located on the heat exchange plate assembly 1 is connected to the inner wall of the first channel 11. That is, when the latch is located on the heat exchange plate assembly 1, the latch is connected to the inner wall of the first channel 11. When assembling the distributor 2, the latch and the radial wall surface of the through hole 21 of the distributor 2 are opposite each other in at least one radial direction of the through hole 21. After the distributor 2 is stacked onto the corresponding heat exchange plate assembly 1, the heat exchange plate assembly 1 is limited by the latch and the distributor 2 in at least one direction radially in the through hole 21, preventing the distributor 2 from moving in that direction, thus helping to improve the assembly accuracy of the distributor 2. In this embodiment, the buckle can be disposed on the inner wall of the first heat exchange plate 15 on the first channel 11, or on the inner wall of the second heat exchange plate 16 on the first channel 11. Alternatively, when there are two or more buckles, one part can be disposed on the inner wall of the first heat exchange plate 15 on the first channel 11, and the other part can be disposed on the inner wall of the second heat exchange plate 16 on the first channel 11. This embodiment does not specifically limit how the buckle is disposed on the heat exchange plate assembly 1. The buckle can be processed separately and then connected to at least a part of the heat exchange plate assembly 1 as a whole by means of bonding, welding, etc. Alternatively, the buckle strip can be formed together with the second heat exchange plate 16 or the first heat exchange plate 15 during processing, and then the buckle can be formed by bending. That is, the first positioning part 4a and the first end 2a or the second end 2b are an integral structure, or the first positioning part 4a and the first connecting part 1a or the second connecting part 1b are an integral structure. This can omit the assembly step of the split buckle and help improve the assembly efficiency of the entire plate heat exchanger.

[0055] In another embodiment, the latches include two or more, with at least one latch located on the heat exchange plate assembly 1, connected to the inner wall of the first channel 11, and radially opposed to the inner wall of the through hole 21 of the distributor 2; at least one latch located on the distributor 2, connected to the inner wall of the through hole 21, and radially opposed to the inner wall of the first channel 11, not shown in the figure. Accordingly, the latches are arranged in the same way as... Figures 13a to 13d The embodiments shown are similar. Figures 14a to 14c The implementation methods shown are not described in detail here.

[0056] In the above embodiment, the radial wall surface of the first channel 11 or the radial wall surface of the through hole 21 serves as the second positioning part 4b. Please refer to the reference. Figure 15a and Figure 15bSpecifically, the latch includes a first abutting part 4a1, which extends along the axis parallel to the through hole 21. When the latch is located in the distributor 2, the second positioning part 4b is the radial wall of the first channel 11, and the first abutting part 4a1 of the latch is at least partially opposite to the radial wall of the first channel 11. When the latch is located in the heat exchange plate assembly 1, the second positioning part 4b is the radial wall of the through hole 21, and the first abutting part 4a1 of the latch is at least partially opposite to the radial wall of the through hole 21.

[0057] To further improve the positioning effect, the buckle is bent and also includes a second abutment 4a2. The second abutment 4a2 is connected to the first abutment 4a1. The second abutment 4a2 extends radially away from the axis of the through hole 21, i.e., the buckle is C-shaped. The second abutment 4a2 of the buckle located in the distributor 2 is at least partially opposite to the axial wall of the first channel 11, confining part of the heat exchange plate assembly 1 between the distributor 2 and the second abutment 4a2. Figure 15a As shown; and / or, the second abutment 4a2 of the snap-fit ​​located on the heat exchange plate assembly 1 is at least partially opposite to the axial wall surface of the through hole 21, confining a portion of the distributor 2 between the heat exchange plate assembly 1 and the second abutment 4a2, as shown. Figure 15b As shown. The C-shaped snap-fit ​​design enhances the positioning of distributor 2, reducing displacement issues during movement after assembly but before brazing.

[0058] In the above embodiments, "relative" can mean that there is a gap between the two, which can be the allowable error range of the assembly, such as 0.01mm to 1mm, or it can mean that there is no gap between the two, and the two are tightly pressed against each other. The first abutting part 4a1 of the buckle abuts against the radial wall surface of the first channel 11 or the radial wall surface of the through hole 21, and the second abutting part 4a2 abuts against the axial wall surface of the first channel 11 or the axial wall surface of the through hole 21, thereby further improving the limiting effect and improving the positioning accuracy.

[0059] To further improve the positioning effect, at least two latches are used, distributed along the circumference of the through hole 21. In one embodiment, two latches are symmetrically distributed about the axis of the through hole 21. Due to the width of the latches, the distributor 2 cannot move within the radial plane of the through hole 21. In another embodiment, three latches are used, with the axis of the through hole 21 within the triangular area formed by the three latches. In this case, the latches also cannot move in any radial direction of the through hole 21. Of course, the number of latches can be increased based on this embodiment.

[0060] Please refer to the following: Figure 16In the above embodiment, along the thickness direction of the plate heat exchanger, the distributor 2 includes a first end 2a and a second end 2b, and the heat exchange plate assembly 1 includes a first connecting portion 1a and a second connecting portion 1b. The first end 2a is connected to the first connecting portion 1a of an adjacent heat exchange plate assembly 1, and the second end 2b is connected to the second connecting portion 1b of another adjacent heat exchange plate assembly 1. At least one of the first end 2a and the second end 2b has a first positioning portion 4a or a second positioning portion 4b on its inner edge, and / or, at least one of the first connecting portion 1a and the second connecting portion 1b has a first positioning portion 4a or a second positioning portion 4b on its inner edge. In addition, the distributor 2 also includes a connecting portion 2c, which connects the first end 2a and the second end 2b. The connecting portion 2c is cylindrical, and a distribution hole 20 is provided in the connecting portion 2c. Correspondingly, along the thickness direction of the plate heat exchanger, the through hole 21 includes a first through opening 21a and a second through opening 21b, and the first channel 11 includes a first opening 11a and a second opening 11b. The first through opening 21a communicates with the first opening 11a of an adjacent first channel 11, and the second through opening 21b communicates with the second opening 11b of another adjacent first channel 11. The diameter of the first opening 11a is the same as the diameter of the first through opening 21a, and the diameter of the second opening 11b is the same as the diameter of the second through opening 21b. The first through opening 21a is located at the first end 2a, and the second through opening 21b is located at the second end 2b. The first through opening 11a is located at the first connecting portion 1a, and the second through opening 11b is located at the second connecting portion 1b. The first connecting portion 1a is located at the second heat exchange plate 16, and the second connecting portion 1b is located at the first heat exchange plate 15. In this embodiment, the first end 2a, the second end 2b, the first connecting part 1a and the second connecting part 1b are all straight parts. Setting them as straight parts not only facilitates assembly, but also ensures the connection strength between the distributor 2 and the first heat exchange plate 15 and the second heat exchange plate 16 after brazing.

[0061] like Figure 12 and Figures 14a to 14c As shown, in one embodiment, there is no gap between the first connecting portion 1a and the second connecting portion 1b of the heat exchange plate assembly 1 along the thickness direction of the plate heat exchanger, and the diameters of the first orifice 11a and the second orifice 11b are the same. The buckle located on the heat exchange plate assembly 1 can be provided on the inner wall of the first orifice 11a of the second heat exchange plate 16 or on the inner wall of the second orifice 11b of the first heat exchange plate 15. In this embodiment, the connecting portion 2c has a cylindrical (thin-walled cylindrical) structure, and the two ends of the connecting portion 2c along the thickness direction of the plate heat exchanger are respectively connected to the inner edges of the first end 2a and the second end 2b, and the diameters of the first through-hole 21a and the second through-hole 21b are the same.

[0062] like Figure 16 As shown, and in combination Figure 17a and Figure 17bIn another embodiment, there is a gap between the first connecting part 1a and the second connecting part 1b of the heat exchange plate assembly 1 along the thickness direction of the plate heat exchanger, and in order to reserve enough space for the distributor 2 for installation, while avoiding the distributor 2 from being too large, the second connecting part 1b protrudes outward in a direction away from the first connecting part 1a of the same heat exchange plate assembly 1. To facilitate the forming of the distributor 2 and the first connecting part 1a, along the thickness direction of the plate heat exchanger, the connecting part 2c includes a first connecting end 2c1 and a second connecting end 2c2. The first connecting end 2c1 is connected to the inner edge of the first end 2a, and the second connecting end 2c2 is connected to the outer edge of the second end 2b. The diameter of the first connecting end 2c1 is larger than the diameter of the second connecting end 2c2, and the diameter of the second connecting end 2c2 is the same as the diameter of the second through-hole 21b. The diameter of the first through-hole 21a is the same as the inner edge diameter of the first end 2a, and the diameter of the second through-hole 21b is the same as the outer edge diameter of the second end 2b. The diameter of the first orifice 11a is larger than the diameter of the second orifice 11b, and the diameter of the first orifice 11a is the same as the diameter of the first through-hole 21a. The diameter of the second orifice 11b is the same as the diameter of the second through-hole 21b. In other words, the connecting part 2c has a thin-walled conical structure, and the first end 2a and the connecting part 2c, as well as the second end 2b and the connecting part 2c, all form obtuse angles, reducing the problem of bending and breakage, facilitating the integral molding of the distributor 2, and making it easy to demold after molding, thus simplifying processing. Similarly, the first connecting part 1a is connected to the body of the first heat exchange plate 15 through the thin-walled conical structure, facilitating molding and demolding. Of course, in this embodiment, the second connecting part 1b can also protrude outward toward the adjacent heat exchange plate group 1, with the corresponding distributor 2 arranged in the opposite direction, as not shown in the figure.

[0063] In yet another embodiment, there is no gap between the first connecting portion 1a and the second connecting portion 1b of the heat exchange plate assembly 1 along the thickness direction of the plate heat exchanger. Figure 12 The difference in the illustrated embodiment is that the diameters of the first orifice 11a and the second orifice 11b are different, and are not shown in the figure. Accordingly, the distributor 2 is the same as the distributor 2 in the embodiment shown in Figure 15.

[0064] In the above embodiments, the distributor 2 also has the following design: Figure 17bAs shown, the connecting portion 2c has a protrusion 2d extending away from the axis of the through hole 21. The protrusion 2d has an inner cavity 2d1 communicating with the through hole 21. A dispensing hole 20 is provided on the peripheral wall of the protrusion 2d, communicating with the inner cavity 2d1. Further, at least a portion of the peripheral wall of the protrusion 2d is a straight wall 2d2, which is connected to the second end 2b and lies in the same plane as the second end 2b. The straight wall 2d2 has the dispensing hole 20. In this embodiment, the peripheral wall of the protrusion 2d is at least a straight wall. Since the straight wall 2d2 is a flat surface, it is easy to machine the dispensing hole 20 on the straight wall 2d2 without causing deformation of the dispenser 2, thereby improving dispensing performance.

[0065] Please refer to it again. Figure 5 In some other embodiments, the difference from the above embodiments is that the second positioning part 4b includes a slot. Of the cooperating first positioning part 4a and second positioning part 4b, one is located on the inner edge of the distributor 2 at the through hole 21, and the other is located on the inner edge of the heat exchange plate assembly 1 at the first channel 11. That is, the slot is located on the inner edge of the heat exchange plate assembly 1 at the first channel 11, or the slot is located on the inner edge of the distributor 2 at the through hole 21. The buckle and the slot cooperate, and the first abutting part 4a1 of the buckle is at least partially located in the slot. One of the buckle and the slot is located on the inner edge of the heat exchange plate assembly 1 at the first channel 11, and the other is located on the inner edge of the distributor 2 at the through hole 21. In this embodiment, by using the slot and buckle to cooperate, the distributor 2 can be further precisely positioned, thereby improving the positioning accuracy of the distribution hole 20 and meeting assembly requirements. In this embodiment, the slot has a notch 4b1 facing the axis of the through hole 21. The notch 4b1 communicates with the through hole 21 or the first channel 11. The buckle is at least partially engaged in the slot. When the buckle needs to be bent, it can be bent first and then assembled so that the buckle is at least partially engaged in the slot and the first abutting part 4a1 of the buckle is opposite to the radial wall of the slot. Alternatively, it can be assembled first and then bent so that the first abutting part 4a1 of the buckle is opposite to the radial wall of the slot for limiting. The corresponding method can be selected according to different needs. The radial wall of the slot is a part of the radial wall of the first channel 11.

[0066] Of course, the arrangement of the slot is not limited to this. It can also be located on the heat exchange plate assembly 1 near the inner edge of the first channel 11, or on the distributor 2 near the inner edge of the through hole 21. The slot has an opening 4b2, which is arranged along the thickness direction of the plate heat exchanger. The latch is at least partially inserted into the slot. Figure 18As shown, the buckle is assembled by bending first and then assembling. At this time, the part of the heat exchange plate assembly 1 near the inner edge of the first channel 11 where the slot is set, or the part of the distributor 2 near the inner edge of the through hole 21 where the slot is set, can extend towards the axis of the through hole 21, and the slot with the opening 4b2 is provided in the extended part.

[0067] In the above embodiment, along the circumferential direction of the through hole 21, the width of the slot is slightly greater than or equal to the width of the buckle (e.g., Figure 5 As shown by the marking line in the diagram, since the slot also has a side wall that connects to the radial wall, after the buckle is engaged in the slot, the side wall will also be opposite to the buckle, further improving the limiting effect.

[0068] In the above embodiment, the outer edges of the first heat exchange plate 15 and the second heat exchange plate 16 are both provided with edging 17. The edging 17 on the first heat exchange plate 15 overlaps with the edging 17 on the second heat exchange plate 16, and the edging 17 on the second heat exchange plate 16 overlaps with the edging 17 of the adjacent heat exchange plate group 1. After the distributor 2 is assembled to the heat exchange plate group 1, the second heat exchange plate 16 of another heat exchange plate group 1 is stacked. The edging 17 of the second heat exchange plate 16 overlaps with the edging 17 on the first heat exchange plate 15 of the previously assembled heat exchange plate group 1, which also limits the distributor 2 along the thickness direction of the plate heat exchanger, further improving the positioning effect and preventing the distributor 2 from loosening or moving during the transfer, handling, and shifting process before brazing, thus affecting the welding quality and helping to improve the overall performance of the plate heat exchanger.

[0069] In this embodiment, the positioning design of the plate heat exchanger not only improves the positioning effect but also has a mistake-proof function. In different plate heat exchangers, the distance between at least one positioning part on the distributor 2 and the distribution hole 20 is different. Since the usage requirements of plate heat exchangers vary, the size and specifications of the distribution hole 20 will also differ. Therefore, during assembly, it is necessary to install distributors 2 of specific specifications. By setting positioning parts at different distances from the distribution hole 20, it is possible to quickly distinguish whether it is the required distributor 2 by observation during assembly, achieving a mistake-proof effect, avoiding confusion, and improving product manufacturing quality. The distance referred to in this embodiment is the distance along the circumferential direction of the through hole 21.

[0070] Please refer to it again. Figure 5 , Figure 17a and Figure 17b and combined Figure 19In the above embodiments, the plate heat exchanger further incorporates a mistake-proof design. Specifically, the distributor 2 has at least one mistake-proof part 22, and there is a gap between the mistake-proof part 22 and the distribution hole 20. In this embodiment, the gap refers to the distance along the circumferential direction of the through hole 21, and the gap can be set according to the specifications of different distributors 2. Furthermore, the mistake-proof part 22 can be combined with a positioning part located on the distributor. For example, different distributors 2 can be distinguished based on the position and / or number of the mistake-proof part 22 and the positioning part, facilitating quick identification during assembly and reducing the need for measurement or other means to identify the distributor 2 during assembly, thus improving assembly efficiency and accuracy.

[0071] Furthermore, the error-proofing part 22 is located on the inner edge of the through hole 21, and even further, it is located on the inner wall of the through hole 21. This design allows for observation of whether each distributor 2 is correctly assembled after assembly and before welding, through the through hole 21 and the first channel 11. For example, in the same plate heat exchanger, the error-proofing parts 22 are arranged along the thickness direction of the plate heat exchanger. If the observed error-proofing parts 22 are aligned, the assembly is correct; if they are not aligned, the assembly is incorrect. Remedial measures can be taken before fixing to reassemble the parts, facilitating post-assembly verification and improving product quality. In addition, after assembly, the observed error-proofing parts 22 also allow for quick differentiation of the plate heat exchanger models represented by different distributors, facilitating identification.

[0072] like Figure 5 , Figure 17a and Figure 17b As shown, in one embodiment, the error-proofing part 22 includes an error-proofing hole 22a. The shape of the error-proofing hole 22a can be any one of a circular hole, a semi-circular hole, a rectangular hole, a triangular hole, or a polygonal hole. The shape of the error-proofing hole 22a can also distinguish different dispensers. The error-proofing hole 22a is provided at the inner edge of at least one of the first end 2a and the second end 2b. The error-proofing hole 22a has a notch 220, which faces the axis of the through hole 21 and communicates with the through hole 21. The design of the notch 220 facilitates identification and improves the accuracy of judgment. Figure 19 As shown, in another embodiment, the error prevention part 22 includes a flange 22b, which is disposed at the inner edge of at least one of the first end 2a and the second end 2b. The flange 22b extends toward the axis of the through hole 21. Of course, the flange 22b can also be disposed at other parts of the distributor 2.

[0073] In another embodiment, the error prevention part 22 includes a marking pattern, which is an integral structure with the dispenser 2. For example, the marking pattern is stamped on the dispenser 2, and the shape of the marking pattern includes, but is not limited to, numbers, letters, and symbols.

[0074] Of course, the error-proofing part 22 can also be a combination of one or more of the error-proofing hole 22a, flange 22b and marking pattern in the above embodiments. In the above embodiments, at least one of the first end 2a and the second end 2b extends toward the axis of the through hole 21 (i.e., extends inward), and the error-proofing part 22 is located at the inwardly extending end and on the inner wall of the through hole 21, which further facilitates observation.

[0075] Furthermore, please refer to Figure 5 To improve the accuracy of error prevention and the precision of distributor 2 assembly, at least one of the first connecting part 1a and the second connecting part 1b is provided with at least one mating part 1e. The mating part 1e mates with the error prevention part 22, and the mating part 22 and the mating part 1e are arranged along the thickness direction of the plate heat exchanger. When the error prevention part 22 on the distributor 2 and the mating part 1e on the heat exchange plate assembly 1 are aligned along the thickness direction of the plate heat exchanger, it indicates that the installed distributor 2 is compatible with the plate heat exchanger. If any error prevention part 22 on the distributor 2 is inconsistent with the mating part 1e on the heat exchange plate assembly 1, it indicates that the installed distributor 2 is incompatible with the plate heat exchanger. During the assembly process, the compatibility of the installed distributor 2 can be identified by visual inspection, which helps to improve the accuracy of assembly, ensure product quality, and also helps to improve assembly efficiency.

[0076] Specifically, the matching anti-misalignment part 22 and the matching part 1e are respectively provided at the first end 2a and the first connecting part 1a, or the matching anti-misalignment part 22 and the matching part 1e are respectively provided at the second end 2b and the second connecting part 1b. In this embodiment, the anti-misalignment part 22 and the matching part 1e are respectively provided on the end of the distributor and the connecting part of the heat exchange plate assembly that can be observed through the first channel 11 and the through hole 21. In this way, it can be determined whether the anti-misalignment part 22 and the matching part 1e match through the first channel 11 and the through hole 21. After assembly, it is also possible to check whether the anti-misalignment part 22 and the matching part 1e correspond through the first channel 11 and the through hole 21. The matching matching part 1e and the anti-misalignment part 22 are arranged along the thickness direction of the plate heat exchanger for easy observation. In addition, the matching matching part 1e and the anti-misalignment part 22 have the same shape for easy identification.

[0077] In this embodiment, in different plate heat exchangers, at least one of the position, shape, and number of the error-proof part 22 of the distributor 2 is different. During the assembly process, the position, shape, and number of the error-proof part 22 of the same plate heat exchanger are the same. Once at least one of the position, shape, and number of the error-proof part 22 is different, it indicates that the distributor 2 is not compatible with the plate heat exchanger. In other words, by combining the position, shape, and number of the error-proof part 22 of the distributor 2, different specifications of distributors 2 can be identified and distinguished, thus achieving the purpose and effect of error prevention.

[0078] Of course, besides the distribution section and heat exchange plate assembly 1 being separate structures, they can also be an integral structure, such as... Figure 20 As shown, the distribution section includes a boss 18. At least one of the first heat exchange plate 15 and the second heat exchange plate 16 is provided with a boss 18. The boss 18 protrudes towards the first inter-plate channel 3. At least one distribution hole 20 is provided on the peripheral wall of at least one boss 18. The inner cavity of the boss 18 is a through hole 21, and the first channel 11 communicates with the through hole 21. In practical applications, the refrigerant enters from the first channel 11 and then enters the first inter-plate channel 3 from the distribution hole 20 on the peripheral wall of the boss 18, improving the distribution performance. For easy differentiation, a mis-proof part 22 can also be provided on the boss 18. In this embodiment, the distribution section and the heat exchange plate assembly 1 are an integral structure. The boss 18 can be formed during the processing of the first heat exchange plate 15 and / or the second heat exchange plate 16, which is convenient for processing and eliminates the need for separate assembly of the distributor, thus helping to improve assembly efficiency.

[0079] Please refer to it again. Figure 1 In the above embodiment, the plate heat exchanger further includes an end plate 200, which is located on one side of the plate heat exchanger along its thickness direction. Additionally, the plate heat exchanger includes a base plate 500, located on the other side of the plate heat exchanger along its thickness direction. The plate heat exchanger also includes connecting pipes 400, which are fixed to the end plate 200. Each of the first channel 11, second channel 12, third channel 13, and fourth channel 14 corresponds to a connecting pipe 400 and communicates with the corresponding connecting pipe 400 cavity. A reinforcing plate 300 is also provided at the connection point between the end plate 200 and the connecting pipe 400 to improve strength and structural performance of the plate heat exchanger. In this embodiment, the connecting pipe 400 may also be partially disposed on the base plate 500, and the cavity of the connecting pipe 400 may communicate with the corresponding channel. In addition, the minimum diameter of the first channel 11 is smaller than the minimum diameters of the second channel 12, the third channel 13 and the fourth channel 14, respectively. Correspondingly, the inner diameter of the tube 400 connected to the first channel 11 is also smaller than the inner diameter of the tube 400 connected to other channels, which makes it easier to distinguish and facilitates quick and accurate connection during assembly and installation, thus improving efficiency.

[0080] In addition, the plate heat exchanger also includes a reinforcing plate 300, which covers the end plate 200 with the connecting pipe 400, and the reinforcing plate 300 is located at the part of the end plate 200 where the connecting pipe 400 is connected.

[0081] In the above embodiments, the heat exchanger assembly 1 is described using an example of a first heat exchanger plate 15 and a second heat exchanger plate 16. In other embodiments, the heat exchanger assembly 1 also includes plates 19, combined with... Figure 21As shown, plate 19 is located on at least one side of heat exchange plate assembly 1 along the thickness direction of plate heat exchanger. Heat exchange plate assembly 1 also has a secondary channel, which is located on at least one side of heat exchange plate assembly 1 along the thickness direction of plate heat exchanger. The secondary channel is located between plate 19 and first heat exchange plate 15, or between plate 19 and second heat exchange plate 16. A second inter-plate channel 5 is formed between the first heat exchange plate 15 and the second heat exchange plate 16, which serves as the main channel for heat exchange with the refrigerant in the first inter-plate channel 3. A secondary channel is formed between the first heat exchange plate 15 and plate 19 or between the second heat exchange plate 16 and plate 19. At the time of manufacture, the secondary channel is not connected to the first inter-plate channel 3 and the second inter-plate channel 5. A liquid outlet 191 is provided on the periphery of plate 19, which is connected to the outside. During prolonged use, the first heat exchange plate 15 and the second heat exchange plate 16 may develop cracks, damage, or corrosion. If these problems occur, the first plate channel 3 and the second plate channel 5 will become connected, causing refrigerant to mix in the water, endangering the user's life. The water mixed with the refrigerant will also cause irreversible damage to the cooling system. Therefore, by setting up plates 19 to form secondary channels, if cracks, damage, or corrosion occur, water or refrigerant can flow into the secondary channels and finally flow out from the liquid outlet, making it convenient for users to observe and ensure that the plate heat exchanger is in normal condition.

[0082] Some of the technical implementation methods described above can be combined or replaced.

[0083] The technical principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that these descriptions are merely for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments or equivalent substitutions of the present invention without creative effort, and all such embodiments will fall within the scope of protection of the present invention.

Claims

1. A plate heat exchanger, characterized in that: The plate heat exchanger includes multiple heat exchange plate assemblies stacked along the thickness direction of the plate heat exchanger. The plate heat exchanger has at least one first inter-plate channel located between adjacent heat exchange plate assemblies. Each heat exchange plate assembly has a second inter-plate channel and a first passage. The first passage communicates with the first inter-plate channel, but is not communicated with the second inter-plate channel. The first channel is close to the edge of the heat exchange plate assembly. The plate heat exchanger includes a stop portion located on the periphery of the first channel. The stop portion has a stop edge, which is connected to the edge of the heat exchange plate assembly next to the first channel. The stop edge is located between the first channel and the second inter-plate channel. The first channel is for refrigerant to flow in, and the first inter-plate channel is for refrigerant to circulate.

2. The plate heat exchanger according to claim 1, characterized in that: The heat exchange plate assembly includes two long sides and two short sides, and the first channel is located at one corner of the heat exchange plate assembly. The stop portion is connected to the long side adjacent to the first channel, and the stop portion is connected to the short side adjacent to the first channel; one end of the stop edge is connected to the long side adjacent to the first channel, and the other end is connected to the short side adjacent to the first channel; there is a gap between the stop edge and the inner edge of the first channel; and the stop edge is adjacent to the second inter-plate channel. The heat exchange plate assembly includes a first heat exchange plate and a second heat exchange plate, and the first heat exchange plate and the second heat exchange plate are stacked. The stop portion includes a stop platform, which is located on at least one of the first heat exchange plate and the second heat exchange plate, and the stop portion protrudes toward the second plate channel. The stop platform of the first heat exchange plate is connected to the stop platform of the second heat exchange plate, or the stop platform of the first heat exchange plate is connected to the stop platform of the second heat exchange plate, or the stop platform of the second heat exchange plate is connected to the first heat exchange plate. The stop platform is part of either the first or second heat exchange plate. The stop platform and the first heat exchange plate are integrally formed, or the stop platform and the second heat exchange plate are integrally formed. The wall thickness of the stop platform is the same as the thickness of the first or second heat exchange plate. The surfaces of the stop platform that contact the first, second, or adjacent heat exchange plates are all planar. The inner edge of the stop platform is connected to the inner edge of the first channel, and the outer edge of the stop platform is the stop edge; And / or, the stop portion includes a stop strip located between the first and second heat exchange plates of the heat exchange plate assembly, along the thickness direction of the plate heat exchanger. One end of the stop strip is connected to the first heat exchange plate, and the other end is connected to the second heat exchange plate. The end face of the stop strip along the thickness direction of the plate heat exchanger is a plane, and the connection surface between the first and second heat exchange plates and the stop strip is a plane.

3. The plate heat exchanger according to claim 2, characterized in that: The distance between the stop edge and the inner edge of the first channel is at least 2 mm; The first channel is located at one corner of the heat exchange plate assembly. One end of the stop edge along its length direction is connected to the long side near the corner where the first channel is located, and the other end is connected to the short side near the corner where the first channel is located.

4. The plate heat exchanger according to claim 2, characterized in that: The connection point between the stop edge and the long side is O1, and the connection point between the stop edge and the short side is O2. Along the line from O1 to O2, the perpendicular distance from a point on the stop edge to the connected short side decreases. The section of the stop edge near the connection point O1 forms a first included angle with the connected long side. The first included angle is located on the side of the stop edge near the first channel. The first included angle is an acute angle and the angle of the first included angle is α, where 10°≤α≤45°. The section of the stop edge near the connection point O2 forms a second included angle with the connected short side. The second included angle is located on the side of the stop edge near the first channel. The angle of the second included angle is β, where 0°<β≤90°.

5. The plate heat exchanger according to claim 2, characterized in that: The heat exchange plate group also has a second channel, which is connected to the first plate inter-channel and the second channel of adjacent heat exchange plate groups are connected; the heat exchange plate group also has a third channel and a fourth channel, which are both connected to the second plate inter-channel within the heat exchange plate group, the third channel of adjacent heat exchange plate groups are connected, and the fourth channel of adjacent heat exchange plate groups are connected. The first and second channels are distributed along one of the long sides, and the third and fourth channels are distributed along the other long side; or, the first and second channels are distributed diagonally, and the third and fourth channels are distributed diagonally. The minimum diameter of the first channel is smaller than the minimum diameters of the second, third, and fourth channels, respectively.

6. The plate heat exchanger according to claim 5, characterized in that: The heat exchange plate assembly also has a sealing part, and the sealing part is provided on the periphery of either the third channel or the fourth channel, and the sealing part is located at the corner where the long side and the short side are connected. The sealing portion includes a protrusion located at at least one of the first heat exchange plate and the second heat exchange plate, the protrusion protruding towards the second inter-plate channel; the protrusion of the first heat exchange plate is connected to the second heat exchange plate, or the protrusion of the first heat exchange plate is connected to the protrusion of the second heat exchange plate, or the protrusion of the second heat exchange plate is connected to the first heat exchange plate; the protrusion is part of the first heat exchange plate or the second heat exchange plate, the protrusion and the first heat exchange plate or the second heat exchange plate are integral structures, and the wall thickness of the protrusion is the same as the plate thickness of the first heat exchange plate or the second heat exchange plate; the connection part between the protrusion and the first heat exchange plate, or the connection part between the protrusion and the second heat exchange plate, or the connection part between the protrusions is a straight part, the inner edge of the protrusion is connected to the inner edge of the third or fourth channel, and the outer edge of the protrusion is connected to the corresponding long side and short side; And / or, the sealing part includes a plug, the plug being located between the first heat exchange plate and the second heat exchange plate of the heat exchange plate assembly, along the thickness direction of the plate heat exchanger, one end of the plug being connected to the first heat exchange plate and the other end being connected to the second heat exchange plate, the end face of the plug being a plane, and the contact surface between the first heat exchange plate and the second heat exchange plate and the plug being a plane.

7. The plate heat exchanger according to any one of claims 2 to 6, characterized in that: The first heat exchange plate has a first corrugation, and the second heat exchange plate has a second corrugation, the first corrugation and the second corrugation extending to the stop edge; The first corrugation includes a first peak and a first trough. The second heat exchange plate has a second corrugation, which includes a second peak and a second trough. In the same heat exchange plate group, the first trough is connected to the second peak. In adjacent heat exchange plate groups, the second trough is connected to the first peak. The first and second peaks have the same height. The second corrugation further includes ridges, the height of which is less than the height of the second wave crest, and there is at least one ridge between adjacent second wave crests and at least one second wave crest between adjacent ridges. The first and second ripples have opposite ripple angles, and the first and second ripples are single-herringbone waves or multiple-herringbone waves.

8. The plate heat exchanger according to claim 7, characterized in that: The heat exchange plate assembly further includes plates located on at least one side of the heat exchange plate assembly along the thickness direction of the plate heat exchanger. The heat exchange plate assembly also has a secondary channel located on at least one side of the heat exchange plate assembly along the thickness direction of the plate heat exchanger. The secondary channel is located between the plate and the first heat exchange plate, or between the plate and the second heat exchange plate. The secondary channel is not connected to the channel between the first plate and the channel between the second plate. A liquid outlet is provided on the periphery of the plate, and the secondary channel is connected to the liquid outlet.

9. The plate heat exchanger according to claim 8, characterized in that: The plate heat exchanger also includes a distribution section; The distribution section and the heat exchange plate assembly are separate structures. The distribution section includes a distributor, which is at least partially disposed in the first inter-plate channel. The distributor has at least one distribution hole that communicates with the first inter-plate channel. The distributor also has a through hole that communicates with the distribution hole, and the first channel communicates with the through hole. The plate heat exchanger includes at least one first positioning part and a second positioning part that cooperate with each other. Of the cooperating first and second positioning parts, one is located on the inner edge of the distributor at the through hole, and the other is located on the inner edge of the heat exchange plate assembly at the first channel. Alternatively, the distribution section and the heat exchange plate assembly are an integral structure. The distribution section includes a boss. At least one of the first heat exchange plate and the second heat exchange plate is provided with the boss. The boss protrudes toward the direction of the first inter-plate channel. At least one distribution hole is provided on the peripheral wall of at least one boss. The inner cavity of the boss is the through hole. The first channel communicates with the through hole.

10. The plate heat exchanger according to any one of claims 5 to 6, characterized in that: The plate heat exchanger also includes an end plate, which is located on one side of the plate heat exchanger along the thickness direction; The plate heat exchanger also includes a base plate, which is located on the other side of the plate heat exchanger along the thickness direction; The plate heat exchanger also includes a connecting pipe, which is fixed to the end plate, and the first channel, the second channel, the third channel and the fourth channel each correspond to a connecting pipe and are connected to the corresponding connecting pipe cavity; The plate heat exchanger also includes a reinforcing plate located at the point where the end plate connects to the nozzle.

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