Plate heat exchanger

Abstract

The utility model relates to a plate heat exchanger. The plate heat exchanger comprises a plurality of stacked plate sheets, a fluid channel is formed between every two adjacent plate sheets, the fluid channels input fluid media through fluid inlets and output the fluid media through fluid outlets, and each fluid channel comprises a main heat exchange area located on a flowing path from the corresponding fluid inlet to the corresponding fluid outlet and an auxiliary heat exchange area located on the flowing path from the corresponding fluid inlet to the corresponding fluid outlet. The fluid inlet and the fluid outlet are formed in the fluid inlet, the opening peripheral area is located beside the fluid inlet and the fluid outlet, and a flow resistance reducing part is arranged at the opening peripheral area so as to reduce the flow resistance at the opening peripheral area, so that the fluid medium can be distributed in the opening peripheral area. According to the plate heat exchanger, the flowing uniformity of a medium in the plate heat exchanger can be enhanced, and the heat exchange performance is improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a plate heat exchanger. Background Art

[0002] A plate heat exchanger is a heat exchanger that is formed by stacking a number of plates to form a plurality of liquid flow channels arranged alternately, and a heat exchange medium flows in adjacent liquid flow channels to perform heat exchange. Plate heat exchangers have many advantages such as compact structure, high heat exchange efficiency, strong reliability, and small refrigerant charge. They are widely used in systems involving heat exchange such as refrigeration or heating. In the prior art, the liquid inlet and outlet of the plate heat exchanger are often arranged at the corners of the plate heat exchanger, which can help increase the flow path of the liquid medium and make the heat exchange more sufficient. However, the applicant has found through research that in such a structure, the flow of the liquid medium in various places inside each plate heat exchanger is uneven, especially the flow rate is slower at the corners near the liquid inlet and outlet, which is not conducive to further improving the heat exchange performance of the product.

[0003] In view of this, it is necessary to propose a new technical solution to overcome the shortcomings of the prior art. Utility Model Content

[0004] Based on this, the present application provides a plate heat exchanger, which can enhance the uniformity of medium flow in the plate heat exchanger and improve heat exchange performance.

[0005] To this end, the present application adopts the following technical solution: a plate heat exchanger, comprising a plurality of stacked plates, wherein a fluid channel is formed between adjacent plates, wherein the fluid channel inputs a fluid medium through a fluid inlet and outputs the fluid medium through a fluid outlet, wherein the fluid channel comprises a main heat exchange zone located on a flow path from the fluid inlet to the fluid outlet, and an outlet peripheral zone located beside the fluid inlet and the fluid outlet, wherein a flow resistance reducing portion is provided at the outlet peripheral zone to reduce the flow resistance at the outlet peripheral zone so that the fluid medium can be distributed in the outlet peripheral zone.

[0006] In one embodiment, the fluid inlet and the fluid outlet have a front side close to the main heat exchange area, a rear side opposite to the front side, and opposite left and right sides, wherein the flow resistance reducing portion is arranged on at least one of the rear side, left side and right side of the fluid inlet and / or fluid outlet.

[0007] In one embodiment, the flow resistance reducing portion is a plurality of protrusions protruding from the plate toward the fluid channel.

[0008] In one embodiment, the flow resistance of the port peripheral area is smaller than the flow resistance of the main heat exchange area.

[0009] In one embodiment, the main heat exchange area is filled with heat exchange fins.

[0010] In one embodiment, the plate includes a first plate and a second plate, and the first plate and the second plate are stacked alternately. The fluid channel formed includes a first channel and a second channel arranged alternately. The first channel is used to circulate a first medium, and the second channel is used to circulate a second medium. The first medium and the second medium are isolated from each other and heat exchange is performed through the plate.

[0011] In one embodiment, the first medium is a low-temperature refrigerant, the second medium is a high-temperature liquid flow, and the flow resistance reducing portion is a protrusion extending into the first channel, so that the low-temperature refrigerant is distributed to the peripheral area of ​​the first channel.

[0012] In one embodiment, the main heat exchange area in the first channel is filled with heat exchange fins, and the second channel is provided with spoiler fins.

[0013] In one embodiment, the first plate and the second plate respectively have a top surface, a bottom surface and a flange, the flange extends beyond the bottom surface to allow adjacent plates to be nested with each other, the second channel is formed between the bottom surface of the first plate and the top surface of the second plate, and the first channel is formed between the bottom surface of the second plate and the top surface of the first plate, wherein the protrusion is stamped by the second plate around the fluid inlet and the fluid outlet.

[0014] In one embodiment, the fluid inlet includes a first inlet connected to the first channel and a second inlet connected to the second channel, the fluid outlet includes a first outlet connected to the first channel and a second outlet connected to the second channel, the first inlet and the first outlet are arranged at a first end of the plate, the second inlet and the second outlet are arranged at a second end of the plate opposite to the first end, and the second plate is provided with a partition rib extending from the first end to the second end to promote the first medium to flow in a U-shape.

[0015] The plate heat exchanger provided in the present application has a fluid channel including a main heat exchange zone located on the flow path from the fluid inlet to the fluid outlet, and an outlet peripheral zone located beside the fluid inlet and the fluid outlet, wherein a flow resistance reducing portion is provided at the outlet peripheral zone to reduce the flow resistance at the outlet peripheral zone so that the fluid medium can be distributed in the outlet peripheral zone; thereby, the uniformity of the medium flow in the plate heat exchanger is enhanced, and the heat exchange performance of the plate heat exchanger can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A three-dimensional combination diagram of an embodiment of a plate heat exchanger provided in this application.

[0018] Figure 2 This is a three-dimensional exploded view of an embodiment of a plate heat exchanger provided in the present application.

[0019] Figure 3 A three-dimensional exploded view of some components of an embodiment of a plate heat exchanger provided in this application.

[0020] Figure 4 for Figure 3 An exploded perspective view of another perspective of the components shown.

[0021] Figure 5 This is a bottom view of the second plate and heat exchange fins in one embodiment of the plate heat exchanger provided in the present application.

[0022] Figure 6 A cross-sectional view of an embodiment of a plate heat exchanger provided in the present application.

[0023] The reference numerals of the components are as follows:

[0024] 100. Plate heat exchanger; 101. First inlet; 102. First outlet; 103. First channel; 104. Main heat exchange zone; 105. Zone around the outlet; 201. Second inlet; 202. Second outlet; 203. Second channel; 10. Plate; 1. First plate; 11. First flange; 12. First top surface; 13. First partition rib; 14. First bottom surface; 2. Second plate; 21. Second flange; 22. Second top surface; 23. Second partition rib; 24. Second bottom surface; 25. Flow resistance reducing portion; 3. Heat exchange fin; 30. Mounting plate; 31. Inlet pipe; 32. Outlet pipe; 4. Spoiler fin; 41. Grid hole portion; 42. Rib hole. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 6As shown, the present application provides a plate heat exchanger 100. The plate heat exchanger 100 includes a plurality of stacked plates 10, and a fluid channel is formed between adjacent plates 10. The fluid channel inputs a fluid medium through a fluid inlet and outputs the fluid medium through a fluid outlet. The fluid channel includes a main heat exchange area 104 located on the flow path from the fluid inlet to the fluid outlet, and an outlet peripheral area 105 located beside the fluid inlet and the fluid outlet, wherein a flow resistance reducing portion 25 is provided at the outlet peripheral area 105 to reduce the flow resistance at the outlet peripheral area 105, so that the fluid medium can be distributed in the outlet peripheral area 105.

[0031] In the plate heat exchanger 100, the fluid medium flows from the fluid inlet to the fluid outlet along a preset flow path. Therefore, the industry usually pays attention to the flow velocity of the fluid medium on the flow path, while ignoring the flow velocity in the non-flow path area beside the fluid inlet and outlet. However, the poor flow velocity in this area will reduce the area of ​​the plate 10 that fully participates in heat exchange, affecting the heat exchange efficiency of the product. The present application provides a flow resistance reducing portion 25 at the port peripheral area 105 beside the fluid inlet and the fluid outlet to reduce the flow resistance at the port peripheral area 105, so that the fluid medium can be distributed in the port peripheral area 105, thereby improving the uneven flow velocity in the plate heat exchanger 100 and improving the heat exchange efficiency. In one embodiment, the port peripheral area 105 beside the fluid inlet and the fluid outlet should be understood as an area near the fluid inlet and the fluid outlet.

[0032] See also Figure 1 and Figure 2 As shown, in one embodiment, the plate heat exchanger 100 includes a mounting plate 30, and the mounting plate 30 can be used to realize the installation and fixation of the plate heat exchanger 100 and other components. The plates 10 included in the plate heat exchanger 100 are stacked and installed on the mounting plate 30 in sequence. The mounting plate 30 is provided with a fluid inlet and a fluid outlet, and the fluid inlet and the outlet are correspondingly connected to the fluid channel inside the plate heat exchanger 100. The fluid inlet and the fluid outlet can also be installed with an inlet pipe 31 and an outlet pipe 32 to facilitate connection with the pipeline for conveying the fluid medium.

[0033] Please refer to 2 to Figure 4 As shown, in this embodiment, the plate 10 includes a first plate 1 and a second plate 2, the first plate 1 and the second plate 2 are alternately stacked, and the fluid channel formed includes a first channel 103 and a second channel 203 arranged alternately, and the first channel 103 and the second channel 203 are not connected. The first channel 103 is used to circulate a first medium, and the second channel 203 is used to circulate a second medium. The first medium and the second medium are isolated from each other and exchange heat through the plate 10.

[0034] The fluid inlet includes a first inlet 101 connected to the first channel 103 and a second inlet 201 connected to the second channel 203, and the fluid outlet includes a first outlet 102 connected to the first channel 103 and a second outlet 202 connected to the second channel 203. That is, the first inlet 101, a plurality of first channels 103 and the first outlet 102 constitute a passage for the flow of the first medium; the second inlet 201, a plurality of second channels 203 and the second outlet 202 constitute a passage for the flow of the second medium. The first channel 103 and the second channel 203 are separated by the first plate 1 and the second plate 2, and the first medium in the first channel 103 and the second medium in the second channel 203 are heat exchanged through the first plate 1 and the second plate 2. Among them, one of the first medium and the second medium is a high-temperature fluid to be cooled, and the other is a low-temperature refrigerant for cooling the high-temperature fluid. In this embodiment, the fluids flowing in the first channel 103 and the second channel 203 are both liquids, that is, the fluids are liquids; in other embodiments, the fluids may also be gases.

[0035] In this embodiment, the plate heat exchanger 100 is roughly in the shape of a cuboid, the plates 10 are stacked in the height direction, the first medium and the second medium are respectively input from the two ends in the length direction of the plate 10 and flow along the length direction of the plate 10 and flow out in a U-shaped reflux. The plate 10 has a first end and a second end opposite to each other in the length direction, the first inlet 101 and the first outlet 102 are arranged at the first end of the plate 10, and the second inlet 201 and the second outlet 202 are arranged at the second end of the plate 10. In other embodiments, the plate heat exchanger 100 may also be in other shapes, and the positions of the fluid inlet and the fluid outlet are not limited to being arranged at opposite ends.

[0036] See also Figure 3 and Figure 4As shown, in this embodiment, the first plate 1 and the second plate 2 have a top surface, a bottom surface and a flange, respectively. Specifically, the first plate 1 has a first flat portion and a first flange 11 extending downward from the edge of the first flat portion, the first flat portion has a first top surface 12 and a first bottom surface 14, and the first flange 11 extends beyond the first bottom surface 14. The first flange 11 is flared and can be sleeved on the second plate 2 adjacent thereto. The first plate 1 is also provided with a first partition rib 13, the first partition rib 13 protrudes from the first bottom surface 14, the first partition rib 13 extends from the second end to the first end, and separates the second inlet 201 and the second outlet 202 on both sides of the first partition rib 13, so that the liquid entering from the second inlet 201 needs to bypass the first partition rib 13 and flow in a U-shaped manner to the second outlet 202. In other embodiments, the shape and position of the first partition rib 13 can also be changed, for example, a path for the liquid to flow in an S-shaped manner is constructed, so that the liquid can be fully in contact with the first plate 1.

[0037] Similarly, the second plate 2 has a second flat portion and a second flange 21 extending downward from the edge of the second flat portion, the second flat portion has a second top surface 22 and a second bottom surface 24, and the second flange 21 extends beyond the second bottom surface 24. The second flange 21 is flared and can be sleeved on the first plate 1 adjacent thereto. The second plate 2 is also provided with a second partition rib 23, the second partition rib 23 protrudes from the second bottom surface 24, the second partition rib 23 extends from the first end to the second end, and separates the first inlet 101 and the first outlet 102 on both sides of the second partition rib 23, so that the liquid entering from the first inlet 101 needs to bypass the second partition rib 23 and flow in a U-shape to the first outlet 102. In other embodiments, the shape and position of the second partition rib 23 can also be changed, for example, a path for the liquid to flow in an S-shape is constructed, so that the liquid can be fully in contact with the second plate 2.

[0038] Among them, a plurality of first plates 1 and second plates 2 are alternately sleeved in sequence through the flanges to form the second channel 203 between the first bottom surface 14 of the first plate 1 and the second top surface 22 of the second plate 2, and to form the first channel 103 between the second bottom surface 24 of the second plate 2 and the first top surface 12 of the first plate 1. The first medium is in the first channel 103 as Figure 4 The second medium flows in the direction indicated by the single arrow in the second channel 203. Figure 4 Flows in the directions indicated by the two arrows.

[0039] See also Figures 3 to 5As shown, in the present embodiment, the first medium is a low-temperature refrigerant, the second medium is a high-temperature liquid flow, the first medium cools the second medium, and the flow resistance reducing portion 25 is a protrusion extending into the first channel 103, so that the low-temperature refrigerant is distributed to the mouth peripheral area 105 of the first channel 103. In this way, the flow rate and distribution area of ​​the low-temperature refrigerant can be increased, and the heat exchange capacity between the low-temperature refrigerant and the high-temperature liquid flow can be improved. Specifically, the fluid inlet and the fluid outlet have a front side close to the main heat exchange area 104, a rear side opposite to the front side, and a left side and a right side arranged oppositely, wherein the flow resistance reducing portion 25 is arranged at least one of the rear side, the left side and the right side of the fluid inlet and the fluid outlet; as shown Figure 5 As shown, the first and second inlets and outlets close to the inner side of the plate are the front sides, and the side opposite to the front side and close to the edge of the plate is the rear side.

[0040] It should be noted that, in the embodiment shown in the drawings, the flow resistance reducing portion 25 is a plurality of protrusions protruding from the plate toward the fluid channel, and more specifically, is a protrusion formed by stamping the second plate 2 around the fluid inlet and the fluid outlet and protruding into the first channel 103. In other embodiments, the flow resistance reducing portion 25 can also be other structures, such as a flow guide disposed in the port peripheral area 105; in other embodiments, the flow resistance reducing portion 25 can also be disposed in the second channel 203. That is, in some embodiments, the flow resistance reducing portion 25 can serve to make the flow resistance of the port peripheral area 105 less than the flow resistance of the main heat exchange area 104. In this embodiment, the protrusion is roughly a convex hull of a circular or elliptical surface. In other embodiments, the shape, size, and distribution of the protrusion can be adjusted according to needs.

[0041] Furthermore, the main heat exchange area 104 in the first channel 103 is filled with heat exchange fins 3. In this embodiment, the thickness of the heat exchange fins 3 is equivalent to the height of the protrusions serving as the flow resistance reducing portion 25, and the protrusions make the flow resistance of the first medium in the port peripheral area 105 of the first channel 103 smaller than the flow resistance of the main heat exchange area 104 provided with the heat exchange fins 3, and the first medium can be distributed to the port peripheral area 105. Furthermore, a spoiler fin 4 is provided in the second channel 203. In this embodiment, the spoiler fin 4 can turbulent the second medium, such as high-temperature liquid flow, flowing in the second channel 203, so that the second medium can fully exchange heat with the first plate 1 and the second plate 2. Specifically, in this embodiment, a rib hole 42 is provided in the middle of the spoiler fin 4, and the shape and position of the rib hole 42 correspond to the first partition rib 13 on the first plate 1, so as to allow the first partition rib 13 to pass through. The spoiler fin 4 is further provided with at least one grid hole portion 41 , and a plurality of staggered grid holes are formed at the grid hole portion 41 to disturb the flow of the second medium.

[0042] See also Figure 6 As shown, the plate heat exchanger 100 provided by the present application includes a first plate 1, a spoiler fin 4, a second plate 2, and a heat exchange fin 3, which are stacked in sequence, and this is repeated until the plate heat exchanger 100 reaches the required number of stacking layers, and is fixed on the mounting plate 30 to complete the assembly. When in use, the pipeline of the first medium is connected through the first inlet 101 and the first outlet 102, and the pipeline of the second medium is connected through the second inlet 201 and the second outlet 202, so that the heat exchange between the first medium and the second medium in the plate heat exchanger 100 can be achieved. The plate heat exchanger 100 provided in the present application is provided with a flow resistance reducing portion 25 at the port peripheral area 105 around the first inlet 101, the first outlet 102, the second inlet 201, and the second outlet 202. The flow resistance at the port peripheral area 105 can be reduced, so that the fluid medium can be distributed in the port peripheral area 105, thereby enhancing the uniformity of the medium flow in the plate heat exchanger 100 and improving the heat exchange performance of the plate heat exchanger 100.

[0043] From the above description of the specific embodiments, it can be known that the plate heat exchanger 100 provided in the present application has a fluid channel including a main heat exchange zone 104 located on the flow path from the fluid inlet to the fluid outlet, and a port peripheral zone 105 located beside the fluid inlet and the fluid outlet, wherein a flow resistance reducing portion 25 is provided at the port peripheral zone 105 to reduce the flow resistance at the port peripheral zone 105 so that the fluid medium can be distributed in the port peripheral zone 105; thereby, the uniformity of the medium flow in the plate heat exchanger 100 is enhanced, and the heat exchange performance of the plate heat exchanger 100 can be improved.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A plate heat exchanger, comprising a plurality of stacked plates (10), wherein fluid channels are formed between adjacent plates (10), wherein a fluid medium is input into the fluid channel through a fluid inlet and the fluid medium is output through a fluid outlet, wherein: The fluid channel comprises a main heat exchange zone (104) located on the flow path from the fluid inlet to the fluid outlet, and an outlet peripheral zone (105) located beside the fluid inlet and the fluid outlet, wherein a flow resistance reducing portion (25) is provided at the outlet peripheral zone (105) to reduce the flow resistance at the outlet peripheral zone (105) so that the fluid medium can be distributed in the outlet peripheral zone (105).

2. The plate heat exchanger according to claim 1, characterized in that: The fluid inlet and the fluid outlet have a front side close to the main heat exchange area (104), a rear side opposite to the front side, and a left side and a right side, wherein the flow resistance reducing portion (25) is arranged on at least one of the rear side, the left side and the right side of the fluid inlet and / or the fluid outlet.

3. The plate heat exchanger according to claim 1, characterized in that: The flow resistance reducing portion (25) is a plurality of protrusions protruding from the plate (10) toward the fluid channel.

4. The plate heat exchanger according to claim 1, characterized in that: The flow resistance of the port peripheral area (105) is smaller than the flow resistance of the main heat exchange area (104).

5. The plate heat exchanger according to claim 1 or 4, characterized in that: The main heat exchange area (104) is filled with heat exchange fins (3).

6. The plate heat exchanger according to any one of claims 1 to 4, characterized in that: The plate (10) comprises a first plate (1) and a second plate (2); the first plate (1) and the second plate (2) are stacked alternately, and the fluid channel formed comprises a first channel (103) and a second channel (203) arranged alternately; the first channel (103) is used for circulating a first medium, and the second channel (203) is used for circulating a second medium; the first medium and the second medium are isolated from each other and exchange heat through the plate (10).

7. The plate heat exchanger according to claim 6, characterized in that: The first medium is a low-temperature refrigerant, the second medium is a high-temperature liquid flow, and the flow resistance reducing portion (25) is a protrusion extending into the first channel (103) so that the low-temperature refrigerant is distributed to the peripheral area (105) of the first channel (103).

8. The plate heat exchanger according to claim 7, characterized in that: The main heat exchange area (104) in the first channel (103) is filled with heat exchange fins (3), and the second channel (203) is provided with a spoiler fin (4).

9. The plate heat exchanger according to claim 7, characterized in that: The first plate (1) and the second plate have a top surface, a bottom surface and a flange respectively, the flange extending beyond the bottom surface so that adjacent plates (10) can be nested with each other, the second channel (203) is formed between the bottom surface of the first plate (1) and the top surface of the second plate (2), and the first channel (103) is formed between the bottom surface of the second plate (2) and the top surface of the first plate (1), wherein the protrusion is formed by stamping the second plate (2) around the fluid inlet and the fluid outlet.

10. The plate heat exchanger according to claim 9, characterized in that: The fluid inlet comprises a first inlet (101) communicating with the first channel (103) and a second inlet (201) communicating with the second channel (203); the fluid outlet comprises a first outlet (102) communicating with the first channel (103) and a second outlet (202) communicating with the second channel (203); the first inlet (101) and the first outlet (102) are arranged at a first end of the plate (10); the second inlet (201) and the second outlet (202) are arranged at a second end of the plate (10) opposite to the first end; and the second plate (2) is provided with a partition rib extending from the first end to the second end to promote the first medium to flow in a U-shape.

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