Plate heat exchanger with fluid distribution function and fluid balance function

Abstract

The invention 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. Through cooperation of the fluid distribution structure and the fluid balance structure, the flow and pressure between the refrigerant side spaces are balanced, and the heat transfer effect is improved.

Description

Technical Field

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

[0002] At present, heat pump refrigeration systems mostly use plate heat exchangers as evaporators. 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 set between the inlet channel at the first corner hole and the air side of the refrigerant 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 distributor is generally an external distributor extending into the first corner hole area or a restricting hole implemented on the plate near the first corner hole area, which increases the available pressure of the refrigerant flowing into the corresponding refrigerant side space from the inlet channel to improve the flow uniformity of the refrigerant; however, due to the flow resistance of the heat exchanger and manufacturing reasons, the existing corner hole distributor of this type can only achieve a certain degree of balance and optimization, and the refrigerant flow in each refrigerant side space cannot be fully balanced, resulting in uneven and uneven boiling surfaces of the refrigerant in the refrigerant side space, which worsens the heat transfer effect and has room for improvement. Summary of the invention

[0003] The present invention is to overcome the above-mentioned defects in the prior art and provide a plate heat exchanger with fluid distribution function and fluid balancing function, which first increases the useful pressure of the refrigerant flowing into each refrigerant side space through the fluid distribution structure to improve the uniformity of fluid distribution, and then connects the adjacent refrigerant side spaces through the fluid balancing structure to achieve the balance of flow and pressure, thereby greatly increasing the heat transfer performance of the heat exchanger and reducing the total flow resistance.

[0004] To achieve the above object, the present invention provides a plate heat exchanger with fluid distribution function and fluid balancing function, comprising: A first heat exchange plate and a second heat exchange plate are alternately stacked from top to bottom, both of which are corrugated plate structures with ridges and grooves, and first, second, third and fourth corner holes are arranged oppositely on the first and second heat exchange plates, and an inlet channel for refrigerant to pass through the heat exchanger is defined at the corresponding first corner hole; A refrigerant side space for the refrigerant to flow, each of the refrigerant side spaces being supported and matched by a groove on a first heat exchange plate and a ridge on a second heat exchange plate adjacent thereto; A heat exchange side space for the flow of heat exchange medium, each of which is formed by the support and cooperation of the groove on the second heat exchange plate and the ridge on the first heat exchange plate below; The refrigerant side space and the heat exchange side space are arranged alternately; Each of the first heat exchange plates is provided with a first convex platform which is upwardly raised and has the same height as the ridge thereon at the first corner hole, and each of the second heat exchange plates is provided with a first sunken platform which is downwardly sunken and has the same depth as the groove thereon at the first corner hole; In the heat exchange side space, the first sink on the second heat exchange plate is supported and connected to the first convex platform on the first heat exchange plate to limit the inflow of refrigerant in the inlet channel; In the refrigerant side space, a fluid distribution structure for allowing the refrigerant in the inlet channel to flow into the refrigerant side space is formed at the first protrusion of the first heat exchange plate and the first depression of the second heat exchange plate; At least one fluid balance structure connecting adjacent refrigerant side spaces is constructed and arranged at a position in each of the refrigerant side spaces where the corresponding pressure potential energy relative to the total energy is less than 50%.

[0005] It is further configured that: the first boss of the first heat exchange plate is provided with at least one groove which is concave downward and has the same depth as the groove portion thereon, on the outer side of the first corner hole corresponding to the first boss of the first heat exchange plate; The first sinking platform of the second heat exchange plate is provided with a ridge surround which corresponds to the groove surround one by one and has the same height as the ridge portion thereon; In the refrigerant side space, the groove enclosure and the ridge enclosure are connected by corresponding supports to divide the space between the first boss and the first sink into at least two, and the partition structure formed by the corresponding groove enclosure and the ridge enclosure is provided with at least one liquid inlet channel connecting adjacent spaces.

[0006] It is further configured that: at least one first groove is provided on the bottom surface surrounded by each of the grooves; A second groove matching the first groove is correspondingly arranged on the top surface surrounded by each of the ridges, and the first groove and the second groove are matched to form a liquid inlet channel.

[0007] It is further configured that: the liquid inlet channel is a gradually expanding structure with a diameter gradually increasing along the flow direction.

[0008] It is further configured that: at least one first balancing hole is provided on the first boss on the outer side surrounded by the groove corresponding to the first heat exchange plate; The first sink of the second heat exchange plate is provided with second balancing holes corresponding to the first balancing holes one by one; The first balancing hole and the second balancing hole are connected and cooperate to form a fluid balancing structure.

[0009] It is further configured that: the first heat exchange plate and the second heat exchange plate are both 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 plate in the relative length direction; A second sinking platform is provided at the first heat exchange plate corresponding to the second corner hole and is concave downwards and has the same depth as the groove portion thereon; and a first connecting portion is provided at the first heat exchange plate corresponding to the corner outside the second sinking platform and is raised upwards and has the same height as the ridge portion thereon; The second heat exchange plate is provided with a second boss which is raised upward and has the same height as the ridge on it at the second corner hole, and the second heat exchange plate is provided with a second connecting portion which is recessed downward and has the same depth as the groove on it at the corner outside the second boss. At least one third balancing hole is arranged in the area of ​​the first connecting portion corresponding to the abutment of the second connecting portion, and a fourth balancing hole corresponding to the third balancing hole is arranged on the second connecting portion; The third balancing hole and the corresponding fourth balancing hole are connected to form a fluid balancing structure.

[0010] It is further configured that: a raised portion which is raised upward and has the same height as the ridge thereon is configured on the plate surface of the first heat exchange plate corresponding to the first convex platform and the second sinking platform, and at least one fifth balancing hole is configured on the raised portion; A recessed portion that is recessed downward and has the same depth as the groove portion thereon is provided on the plate surface of the second heat exchange plate opposite to the first raised portion, and a sixth balancing hole corresponding to the fifth balancing hole is provided on the recessed portion; The raised portion and the recessed portion abut against 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 connects adjacent refrigerant spaces.

[0011] It is further configured that: the raised portion on the first heat exchange plate is configured to correspond to an edge of one end of the first corner hole.

[0012] It is further configured that: when the plate heat exchanger is in use, the end where the first corner hole is located is located at the bottom.

[0013] Compared with the prior art, the present invention has a simple and reasonable structure. It increases the 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 connects adjacent refrigerant side spaces through the fluid balance structure to make the pressure between each space basically the same. This not only effectively reduces the total flow resistance of the refrigerant side space, but also makes the flow and pressure distribution between each refrigerant side space more balanced, making the boiling surface in the refrigerant side space more uniform, and effectively enhancing the heat transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the separation structure of a plate heat exchanger with fluid distribution function and fluid balance function according to the present invention; Figure 2 yes Figure 1The enlarged structural diagram of the middle A part; Figure 3 It is a schematic diagram of the cross-sectional structure of the plate heat exchanger corresponding to the first corner hole.

[0015] The following reference numerals are marked on the drawings in conjunction with the drawings: 1. First heat exchange plate; 11. First boss; 111. Groove surround; 1111. First groove; 112. First balance hole; 12. Second sink; 13. First connecting portion; 131. Third balance hole; 14. Raised portion; 141. Fifth balance hole; 2. Second heat exchange plate; 21. First sink; 211. Ridge surround; 2111. Second groove; 212. Second balance hole; 22. Second boss; 23. Second connecting portion; 231. Fourth balance hole; 24. Concave portion; 241. Sixth balance hole a. First corner hole; b. Second corner hole; c. Third corner hole; d. Fourth corner hole; e. Ridge; f. Groove; g. Flange; h. Refrigerant side space; i. Heat exchange side space; j. Inlet channel. DETAILED DESCRIPTION

[0016] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0017] The present invention provides a plate heat exchanger having a fluid distribution function and a fluid balance function. Figure 1 and Figure 3 As shown, it includes a first heat exchange plate 1 and a second heat exchange plate 2 which are alternately stacked from top to bottom, and the first heat exchange plate 1 and the second heat exchange plate 2 are both 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; wherein the grooves f on the first heat exchange plate 1 and the ridges e on the adjacent lower second heat exchange plate 2 support and cooperate to form a refrigerant side space h, and the refrigerant side space h is used for the flow of refrigerant; the grooves f on the second heat exchange plate 2 and the ridges e on the adjacent lower first heat exchange plate 1 support and cooperate to form a heat exchange side space i, and the heat exchange side space i is used for the flow of heat exchange media such as water to exchange heat with the refrigerant in the refrigerant side space h; such a structure allows the refrigerant side space h and the heat exchange side space i to be alternately arranged inside the plate heat exchanger.

[0018] In this embodiment, if Figure 1As shown, the first heat exchange plate 1 and the second heat exchange plate 2 are adapted rectangular plate structures and the edges of the two plates are provided with a flange g structure that is folded downward to facilitate nesting between each other, and the four corners of the first heat exchange plate 1 and the second heat exchange plate 2 are respectively provided with a first corner hole a, a second corner hole b, a third corner hole c and a fourth corner hole d that are relatively arranged, wherein the first corner hole a and the second corner hole b are located at one end of the rectangular plate in the relative length direction, and the third corner hole c and the fourth corner hole d are located at the other end of the rectangular plate in the relative length direction; when the plate heat exchanger of this patent is installed and used, it is preferred that the end where the first corner hole a is located is located at the bottom, so as to optimize heat transfer.

[0019] In this embodiment, if Figure 2 and Figure 3 As shown, the first heat exchange plate 1 is provided with a first boss 11 which is raised upward and has the same height as the ridge e thereon at its first corner hole a, and the second heat exchange plate 2 is provided with a first sink 21 which is recessed downward and has the same depth as the groove f thereon at its first corner hole a. Such a structure enables the first boss 11 and the first sink 21 to be supported and connected in the heat exchange side space i, and an inlet channel j for the refrigerant to flow through the heat exchanger is formed in the heat exchanger corresponding to the first corner hole a, and the inlet channel j is blocked from the heat exchange side space i to limit the inflow of refrigerant and is connected to the refrigerant side space h to allow 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.

[0020] In the above scheme, preferably, Figure 2 and Figure 3As shown, the first boss 11 of the first heat exchange plate 1 is provided with at least one groove surround 111 which is recessed downward and has the same recessed depth as the groove portion f thereon, and the groove surround 111 independently surrounds the first corner hole a or cooperates with the flange g at the edge of the plate body to surround the first corner hole a. In this embodiment, there are two groove surrounds 111, namely, a first groove surround 111 which is circumferentially arranged on the outside of the first corner hole a, and a second groove surround 111 which is arranged on the outside of the first groove surround 111 and connected to the flange g at the corner of the plate body to surround the first groove surround 111; the first sink 21 of the second heat exchange plate 2 is provided with a ridge surround 211 which corresponds to the groove surround 111 one by one and has the same raised height as the ridge portion e thereon. In this embodiment, there are also two ridge surrounds 211, namely, a first ridge surround 211 which is opposite to the first groove surround 111 and circumferentially arranged on the outside of the first corner hole a, and a second ridge surround 111 which is opposite to the first groove surround 111 and connected to the flange g at the corner of the plate body to surround the first groove surround 111. A second ridge enclosure 211 surrounded by a ridge enclosure 211; in the refrigerant side space h, the relative groove enclosure 111 and the ridge enclosure 211 are supported and connected to form a blocking structure that blocks the space into an inner space and an outer space, and each blocking structure is constructed with at least one liquid inlet channel connecting the inner and outer spaces; specifically, at least one first groove 1111 is arranged on the bottom surface of each groove enclosure 111, and a second groove 2111 matching the first groove 1111 is correspondingly arranged on the top surface of each ridge enclosure 211, so that 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 matched to form a liquid inlet channel; preferably, the liquid inlet channel on the blocking structure is a gradually expanding structure with a diameter (flow cross section) gradually increasing along the flow direction; the fluid distribution structure designed in this way can effectively increase the useful pressure of the refrigerant flowing from the inlet channel j into the refrigerant side space h, can improve the uniformity of fluid distribution, and reduce flow resistance.

[0021] In the present embodiment, at least one fluid balance structure connecting adjacent refrigerant side spaces h is constructed and arranged at a position where the pressure potential energy of the refrigerant side space h is less than 50% relative to the total energy. In this way, the refrigerant can achieve pressure and flow balance at a specific position by penetrating all the refrigerant side spaces h through the fluid balance structure. This ensures the uniformity of the distribution of the refrigerant flow in each refrigerant side space h, thereby balancing the boiling surface in each refrigerant side space h and improving the heat transfer effect. Specifically, compared with a plate heat exchanger without a fluid balance structure, the heat transfer performance is improved by more than 30%.

[0022] In this embodiment, if Figure 2As shown, at least one first balancing 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 balancing hole 212 corresponding to the first balancing hole 112 is provided on the first sink 21 of the second heat exchange plate 2; in the heat exchange side space i, the first boss 11 and the first sink 21 are abutted against each other, and the first balancing hole 112 and the second balancing hole 212 arranged oppositely thereon are connected to form a first fluid balancing structure; specifically, the first balancing 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 balancing hole 112 is arranged correspondingly near the corner edge of the liquid inlet channel.

[0023] In this embodiment, if Figure 2 As shown, the first heat exchange plate 1 is provided with a second sink 12 which is concave downward and has the same depth as the groove f on it at the second corner hole b, and the first heat exchange plate 1 is provided with a first connecting portion 13 which is raised upward and has the same height as the ridge e on it at the corner outside the second sink 12; the second heat exchange plate 2 is provided with a second boss 22 which is raised upward and has the same height as the ridge e on it at the second corner hole b, and the second heat exchange plate 2 is provided with a second boss 22 which is concave downward and has the same depth as the groove on it at the corner outside the second boss 22. f; at least one third balancing hole 131 is arranged in the area of ​​the first connecting part 13 corresponding to the second connecting part 23, and the second connecting part 23 is provided with a fourth balancing hole 231 corresponding to the third balancing hole 131 one by one; the first connecting part 13 and the second connecting part 23 are offset against each other in the heat exchange side space i, and the third balancing holes 131 and the corresponding fourth balancing holes 231 arranged relatively thereon are connected in cooperation to form a second fluid balancing structure, which further balances the flow and pressure in each refrigerant side space h.

[0024] In this embodiment, if Figure 2As shown, the first heat exchange plate 1 is provided with a raised portion 14 which is raised upward and has the same raised height as the ridge e thereon on the plate surface corresponding to the first convex platform 11 and the second sunken platform 12, and at least one fifth balancing hole 141 is provided on the raised portion 14; the second heat exchange plate 2 is provided with a depressed portion 24 which is depressed downward and has the same depressed depth as the groove f thereon on the plate surface opposite to the first convex portion 14, and the depressed portion 24 is provided with a sixth balancing hole 241 which corresponds to the fifth balancing hole 141 one by one; the raised portion 14 and the depressed portion 24 are abutted against each other in the heat exchange side space i and the first balancing hole 141 is arranged relatively thereon. The fifth balancing hole 141 and the sixth balancing hole 241 cooperate to form a third fluid balancing structure connecting adjacent refrigerant spaces; preferably, the raised portion 14 is arranged at the edge of the end where the first corner hole a of the first heat exchange plate 1 is located and is arranged close to the second groove surround 111, so as to construct a liquid inlet channel formed by the first groove 1111 of the second groove surround 111 and the second groove 2111 of the second ridge surround 211 in the refrigerant side space h, which directly connects the raised portion 14 and the space formed in the depression, thereby further optimizing the balanced distribution of flow and pressure between each refrigerant side space h.

[0025] Compared with the prior art, the present invention has a simple and reasonable structure. It increases the 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 connects adjacent refrigerant side spaces through the fluid balance structure to make the pressure between each space basically the same. This not only effectively reduces the total flow resistance of the refrigerant side space, but also makes the flow and pressure distribution between each refrigerant side space more balanced, making the boiling surface in the refrigerant side space more uniform, and effectively enhancing the heat transfer effect.

[0026] The above disclosure is only an embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A plate heat exchanger with fluid distribution function and fluid balancing function, comprising: A first heat exchange plate and a second heat exchange plate are alternately stacked from top to bottom, both of which are corrugated plate structures with ridges and grooves, and first, second, third and fourth corner holes are arranged oppositely on the first and second heat exchange plates, and an inlet channel for refrigerant to pass through the heat exchanger is defined at the corresponding first corner hole; A refrigerant side space for the refrigerant to flow, each of the refrigerant side spaces being supported and matched by a groove on a first heat exchange plate and a ridge on a second heat exchange plate adjacent thereto; A heat exchange side space for the flow of heat exchange medium, each of which is formed by the support and cooperation of the groove on the second heat exchange plate and the ridge on the first heat exchange plate below; The refrigerant side space and the heat exchange side space are arranged alternately; Characterized in that each of the first heat exchange plates is provided with a first convex platform which bulges upward and has the same bulge height as the ridge thereon at the first corner hole, and each of the second heat exchange plates is provided with a first sunken platform which is sunken downward and has the same sunken depth as the groove thereon at the first corner hole; In the heat exchange side space, the first sink on the second heat exchange plate is supported and connected to the first convex platform on the first heat exchange plate to limit the inflow of refrigerant in the inlet channel; In the refrigerant side space, a fluid distribution structure for allowing the refrigerant in the inlet channel to flow into the refrigerant side space is formed at the first protrusion of the first heat exchange plate and the first depression of the second heat exchange plate; At least one fluid balance structure connecting adjacent refrigerant side spaces is constructed and arranged at a position in each of the refrigerant side spaces where the corresponding pressure potential energy relative to the total energy is less than 50%.

2. A plate heat exchanger with fluid distribution function and fluid balancing function according to claim 1, characterized in that: The first boss of the first heat exchange plate is provided with at least one groove which is concave downward and has the same depth as the groove portion on it, on the outer side of the first corner hole corresponding to the first boss of the first heat exchange plate; The first sinking platform of the second heat exchange plate is provided with a ridge surround which corresponds to the groove surround one by one and has the same height as the ridge portion thereon; In the refrigerant side space, the groove enclosure and the ridge enclosure are connected by corresponding supports to divide the space between the first boss and the first sink into at least two, and the partition structure formed by the corresponding groove enclosure and the ridge enclosure is provided with at least one liquid inlet channel connecting adjacent spaces.

3. A plate heat exchanger with fluid distribution function and fluid balance function according to claim 2, characterized in that: At least one first groove is provided on the bottom surface surrounded by each of the grooves; A second groove matching the first groove is correspondingly arranged on the top surface surrounded by each of the ridges, and the first groove and the second groove are matched to form a liquid inlet channel.

4. A plate heat exchanger with fluid distribution function and fluid balancing function according to claim 2 or 3, characterized in that: The liquid inlet channel is a gradually expanding structure with a diameter gradually increasing along the flow direction.

5. The plate heat exchanger with fluid distribution function and fluid balance function according to claim 2, characterized in that: At least one first balancing hole is provided on the first boss on the outer side of the first heat exchange plate corresponding to the groove; The first sink of the second heat exchange plate is provided with second balancing holes corresponding to the first balancing holes one by one; The first balancing hole and the second balancing hole are connected and cooperate to form a fluid balancing structure.

6. The plate heat exchanger with fluid distribution function and fluid balance function according to claim 1, characterized in that: The first heat exchange plate and the second heat exchange plate are both 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 plate in the relative length direction; A second sinking platform is provided at the first heat exchange plate corresponding to the second corner hole and is concave downwards and has the same depth as the groove portion thereon; and a first connecting portion is provided at the first heat exchange plate corresponding to the corner outside the second sinking platform and is raised upwards and has the same height as the ridge portion thereon; The second heat exchange plate is provided with a second boss that bulges upward and has the same height as the ridge on it at the second corner hole, and the second heat exchange plate is provided with a second connecting portion that is concave downward and has the same depth as the groove on it at the corner outside the second boss. At least one third balancing hole is arranged in the area of ​​the first connecting portion corresponding to the abutment of the second connecting portion, and a fourth balancing hole corresponding to the third balancing hole is arranged on the second connecting portion; The third balancing hole and the corresponding fourth balancing hole are connected to form a fluid balancing structure.

7. A plate heat exchanger with fluid distribution function and fluid balancing function according to claim 6, characterized in that: The first heat exchange plate is provided with a raised portion on the plate surface between the first convex platform and the second sinking platform, which is raised upward and has the same height as the ridge thereon, and at least one fifth balancing hole is provided on the raised portion; A recessed portion that is recessed downward and has the same depth as the groove portion thereon is provided on the plate surface of the second heat exchange plate opposite to the first raised portion, and a sixth balancing hole corresponding to the fifth balancing hole is provided on the recessed portion; The raised portion and the recessed portion abut against 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 connects adjacent refrigerant spaces.

8. The plate heat exchanger with fluid distribution function and fluid balance function according to claim 7, characterized in that: The raised portion on the first heat exchange plate is arranged corresponding to the edge of one end of the first corner hole.

9. The plate heat exchanger with fluid distribution function and 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 located at the bottom.

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