Heat exchange plates, plate heat exchangers and heat exchange systems

Abstract

The present invention provides a heat exchange plate, a plate heat exchanger, and a heat exchange system. The heat exchange plate is provided with a refrigerant inlet, a refrigerant outlet, a water inlet, and a water outlet. The heat exchange area of ​​the heat exchange plate is provided with a point wave structure. The point wave structure includes a plurality of protrusions and a plurality of recessed portions. The protrusions protrude outward from the front surface of the heat exchange plate, and the recessed portions protrude outward from the back surface of the heat exchange plate. The plurality of protrusions and the plurality of recessed portions are alternately arranged in the width direction and the height direction, and the protrusions and the recessed portions have the same shape. In the width direction, the center-to-center distance between the centers of adjacent protrusions and the centers of the recessed portions decreases from the left side to the right side. The heat exchange plate of the present invention can effectively improve the flow distribution uniformity of the liquid refrigerant in its width direction, thereby improving the heat exchange effect and further improving the heat exchange efficiency.

Description

Technical Field

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

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of multiple stacked corrugated metal plates. A multi-channel distribution structure is formed between adjacent plates to exchange heat. Plate heat exchangers feature high heat transfer efficiency, light weight, minimal footprint, compact structure, and long service life. They are widely used and have a promising market and development prospects.

[0003] In order to increase the heat exchange area, the refrigerant inlet, refrigerant outlet, water inlet and water outlet on the heat exchange plates of the existing plate heat exchanger are respectively arranged at the four corners of the heat exchange plates, and the refrigerant inlet and refrigerant outlet are arranged close to the first side of the heat exchange plate in the width direction of the heat exchange plate.

[0004] However, when the refrigerant enters the fluid channel of the plate heat exchanger from the refrigerant inlet, due to the sudden expansion phenomenon at the refrigerant inlet and the gas-liquid separation phenomenon of the refrigerant, the mass of the liquid phase fluid of the refrigerant is large and the flow inertia is large, and the mass of the gas phase fluid of the refrigerant is small and the inertia is small, so that the liquid phase refrigerant will flow toward the second side of the heat exchange plate away from the refrigerant inlet in the width direction of the heat exchange plate, and the gas phase refrigerant will gather at the first side of the heat exchange plate close to the refrigerant inlet in the width direction of the heat exchange plate, resulting in a small flow rate of the liquid phase refrigerant close to the refrigerant inlet in the width direction of the heat exchange plate, and a large flow rate of the liquid phase refrigerant away from the refrigerant inlet in the width direction of the heat exchange plate, resulting in uneven flow distribution of the liquid phase refrigerant in the width direction of the heat exchange plate. Since the liquid phase refrigerant has a greater impact on the overall heat exchange capacity of the plate heat exchanger, the uneven flow distribution of the liquid phase refrigerant will affect the overall heat exchange capacity of the plate heat exchanger. Summary of the Invention

[0005] The first object of the present invention is to provide a heat exchange plate that can effectively improve the flow distribution uniformity of liquid refrigerant in its width direction, thereby improving the heat exchange effect and further improving the heat exchange efficiency.

[0006] A second object of the present invention is to provide a plate heat exchanger having the above-mentioned heat exchange plates.

[0007] A third object of the present invention is to provide a heat exchange system having the above-mentioned plate heat exchanger.

[0008] In order to achieve the first purpose of the present invention, the present invention provides a heat exchange plate, which is provided with a refrigerant inlet, a refrigerant outlet, a water inlet and a water outlet, and the refrigerant inlet, the refrigerant outlet, the water inlet and the water outlet are respectively arranged at the four corners of the heat exchange plate, the refrigerant inlet and the refrigerant outlet are arranged near the left side of the heat exchange plate in the width direction of the heat exchange plate, the water inlet and the water outlet are arranged near the right side of the heat exchange plate in the width direction, and the refrigerant outlet and the water inlet are arranged near the upper end of the heat exchange plate in the height direction of the heat exchange plate, the refrigerant inlet and the water outlet are arranged near the upper end of the heat exchange plate It is arranged near the lower end of the heat exchange plate in the height direction; a point wave structure is provided in the heat exchange area of ​​the heat exchange plate, and the point wave structure includes a plurality of protrusions and a plurality of recessed portions, the protrusions are provided to protrude outward from the front side of the heat exchange plate, and the recessed portions are provided to protrude outward from the back side of the heat exchange plate, the back side and the front side are arranged opposite to each other in the thickness direction of the heat exchange plate, the plurality of protrusions and the plurality of recessed portions are alternately arranged in the width direction and the height direction, and the shapes of the protrusions and the recessed portions are the same; in the width direction, the width center distance between the center of adjacent protrusions and the center of the recessed portions decreases from the left side to the right side.

[0009] A preferred solution is that the difference between the center distances of two adjacent widths is a decreasing difference, and the multiple decreasing differences are all the same fixed difference.

[0010] A further solution is that the width center spacing is Y, the distance between the raised portion or recessed portion and the left side in the width direction is X, and the width center spacing Y and its corresponding position distance X form a decreasing function law such as linear, quadratic curve, logarithmic, or exponential.

[0011] A further solution is that the plurality of raised portions and the plurality of recessed portions are alternately arranged at equal intervals in the height direction.

[0012] A further solution is that, in the height direction, the height center distance between the centers of adjacent protrusions and the centers of adjacent recesses decreases from the upper end toward the lower end.

[0013] A further solution is that, in the height direction, the height center distance between the centers of adjacent protrusions and the centers of adjacent recesses increases from the upper end toward the lower end.

[0014] A further solution is that the raised portion includes a connected flat plate and a curved ring, the end of the curved ring away from the flat plate is smoothly connected to the plate body of the heat exchange plate, and the curved ring is concavely curved close to the plate body.

[0015] A further solution is that the plane plate is in a shape selected from the group consisting of circle, ellipse, convex, parallelogram, trapezoid, rhombus, crescent, triangle, square, rectangle and hexagon.

[0016] In order to achieve the second object of the present invention, the present invention provides a plate heat exchanger, comprising at least two heat exchange plates, which are the above-mentioned heat exchange plates; multiple heat exchange plates are stacked in the thickness direction of the plate heat exchanger, and among two adjacent heat exchange plates, the raised portion of one heat exchange plate contacts the recessed portion of the other heat exchange plate to form a fluid channel.

[0017] In order to achieve the third object of the present invention, the present invention provides a heat exchange system, including a plate heat exchanger, and the plate heat exchanger is the plate heat exchanger mentioned above.

[0018] It can be seen from the above scheme that the shapes of the raised portions and the recessed portions of the heat exchange plate of the present invention are the same, and the width center spacing between the centers of adjacent raised portions and the centers of recessed portions of the heat exchange plate of the present invention in the width direction of the heat exchange plate decreases from the left side to the right side, so that the width center spacing between adjacent raised portions and recessed portions on the left side close to the refrigerant inlet in the width direction of the heat exchange plate is larger, while the width center spacing between adjacent raised portions and recessed portions on the right side away from the refrigerant inlet in the width direction of the heat exchange plate is smaller.

[0019] Because the fluid channel of the plate heat exchanger of the present invention is formed by the raised portions and recessed portions of two adjacent heat exchange plates, the channel width of the fluid channel of the plate heat exchanger of the present invention in the width direction of the heat exchange plate decreases from the left side to the right side, so that the resistance of the fluid channel of the plate heat exchanger in the width direction of the heat exchange plate increases from the left side to the right side, so that the fluid channel resistance on the left side close to the refrigerant inlet in the width direction of the heat exchange plate is smaller, which can increase the flow rate proportion of the liquid phase refrigerant on the left side close to the refrigerant inlet in the width direction of the heat exchange plate, and the flow rate proportion of the liquid phase refrigerant on the left side close to the refrigerant inlet in the width direction of the heat exchange plate is increased. The fluid channel resistance on the right side of the inlet is larger, which can reduce the flow ratio of the liquid refrigerant on the right side away from the refrigerant inlet in the width direction of the heat exchange plate. Therefore, under the premise of entering the refrigerant from the refrigerant inlet into the fluid channel of the plate heat exchanger at the same speed, the liquid refrigerant with large mass and large flow inertia is subject to the resistance of the fluid channel of the plate heat exchanger in the width direction when flowing in the width direction of the plate heat exchanger. It is distributed gradually from the left to the right side, which can effectively improve the uniformity of the flow distribution of the liquid refrigerant in the width direction of the plate heat exchanger, thereby improving the heat exchange effect and then improving the heat exchange efficiency.

[0020] Since the flow distribution of the liquid refrigerant in the width direction of the plate heat exchanger is more uniform, the flow pressure of the liquid refrigerant in the width direction of the plate heat exchanger also tends to be uniform, which can avoid the occurrence of overheating areas in the width direction of the plate heat exchanger, thereby avoiding the deterioration of heat transfer and effectively improving the heat exchange performance of the plate heat exchanger.

[0021] In addition, the plate heat exchanger of the present invention adopts a method in which the center-to-center width spacing between the centers of adjacent protrusions and recessed portions on the heat exchange plates decreases from the left side to the right side in the width direction of the plate heat exchanger to evenly distribute the flow of liquid refrigerant in the width direction of the plate heat exchanger. Without adding additional parts and assembly steps, the flow distribution uniformity of the liquid refrigerant in the width direction of the plate heat exchanger can be effectively improved, thereby saving materials, simplifying the assembly production process, and further saving production costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural cross-sectional view of the first embodiment of the plate heat exchanger of the present invention.

[0023] Figure 2 It is a cross-sectional view of the first embodiment of the plate heat exchanger of the present invention in the width direction.

[0024] Figure 3 It is a cross-sectional view of the first embodiment of the plate heat exchanger of the present invention in the height direction.

[0025] Figure 4 It is a structural diagram of the heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0026] Figure 5 It is a front view of the heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 6 It is a partial structural cross-sectional view of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 7 yes Figure 6 Enlarged view at point A.

[0029] Figure 8 It is a partial front view of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0030] Figure 9 It is a cross-sectional view of the heat exchange plate in the width direction of the first embodiment of the plate heat exchanger of the present invention.

[0031] Figure 10 It is a partial structural cross-sectional view of the second embodiment of the plate heat exchanger of the present invention.

[0032] Figure 11 It is a cross-sectional view of the third embodiment of the plate heat exchanger of the present invention in the height direction.

[0033] Figure 12 It is a cross-sectional view of the fourth embodiment of the plate heat exchanger of the present invention in the height direction.

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0035] The first embodiment of the plate heat exchanger:

[0036] See also Figures 1 to 9 This embodiment discloses a plate heat exchanger 10 comprising at least two heat exchange plates 11. The plurality of heat exchange plates 11 are stacked in the thickness direction of the plate heat exchanger 10. Among two adjacent heat exchange plates 11, a raised portion 111 of one heat exchange plate 11 contacts a recessed portion 112 of the other heat exchange plate 11 to form a fluid channel 12. Specifically, in this embodiment, the contact surface between a portion of the raised portion 111 and the recessed portion 112 of two adjacent heat exchange plates 11 forms a welding surface. After filling the welding surface with copper foil solder and high-temperature brazing, the two adjacent heat exchange plates 11 are stacked and fixed, thereby causing the raised portion 111 of one heat exchange plate 11 to contact the recessed portion 112 of the other heat exchange plate 11 to form a fluid channel 12. A plurality of heat exchange plates 11 are stacked in the thickness direction of the plate heat exchanger 10 to form a heat exchange structure, and end plates are superimposed on both ends of the heat exchange structure in the thickness direction of the plate heat exchanger 10. After high-temperature welding, a complete plate heat exchanger 10 can be formed.

[0037] In this embodiment, the heat exchange plate 11 is provided with a refrigerant inlet 113, a refrigerant outlet 114, a water inlet 115, and a water outlet 116. The refrigerant inlet 113, the refrigerant outlet 114, the water inlet 115, and the water outlet 116 are respectively arranged at the four corners of the heat exchange plate 11. Specifically, in this embodiment, the refrigerant inlet 113 and the refrigerant outlet 114 are arranged near the left side of the heat exchange plate 11 in the width direction of the heat exchange plate 11, the water inlet 115 and the water outlet 116 are arranged near the right side of the heat exchange plate 11 in the width direction of the heat exchange plate 11, and the refrigerant outlet 114 and the water inlet 115 are arranged near the upper end of the heat exchange plate 11 in the height direction of the heat exchange plate 11, and the refrigerant inlet 113 and the water outlet 116 are arranged near the lower end of the heat exchange plate 11 in the height direction of the heat exchange plate 11. The width direction of the plate heat exchanger 10 in this embodiment is consistent with the width direction of the heat exchange plate 11 .

[0038] Furthermore, the heat exchange region of the heat exchange plate 11 of this embodiment is provided with a dot wave structure, which includes a plurality of raised portions 111 and a plurality of recessed portions 112. The raised portions 111 protrude outward from the front surface of the heat exchange plate 11, and the recessed portions 112 protrude outward from the back surface of the heat exchange plate 11. The back surface and the front surface of the heat exchange plate 11 are arranged opposite each other in the thickness direction of the heat exchange plate 11. The plurality of raised portions 111 and the plurality of recessed portions 112 are alternately arranged in the width and height directions of the heat exchange plate 11, and the raised portions 111 and the recessed portions 112 have the same shape. Specifically, in the width direction of the heat exchange plate 11, the center-to-center spacings A1, A2, A3, A4, A5, A6, etc. between the centers of adjacent raised portions 111 and the centers of recessed portions 112 decrease from the left side to the right side. The left side referred to in this embodiment is the left edge of the heat exchange plate 11 in the width direction, and the right side is the right edge of the heat exchange plate 11 in the width direction.

[0039] Combine Figure 8 and Figure 9 In the present embodiment, the protrusions 111 and the recesses 112 of the heat exchange plate 11 have the same shape, and the center-to-center width spacings A1, A2, A3, A4, A5, A6, ... between the centers of adjacent protrusions 111 and the centers of recesses 112 of the heat exchange plate 11 in the width direction of the heat exchange plate 11 decrease from the left side to the right side, i.e., A1>A2, A2>A3, A3>A4, A4>A5, A5>A6, ..., so that the center-to-center width spacings of adjacent protrusions 111 and recesses 112 on the left side close to the refrigerant inlet 113 in the width direction of the heat exchange plate 11 are larger, while the center-to-center width spacings of adjacent protrusions 111 and recesses 112 on the right side far from the refrigerant inlet 113 in the width direction of the heat exchange plate 11 are smaller.

[0040] Because the fluid channel 12 of the plate heat exchanger 10 in this embodiment is formed by the convex portion 111 and the concave portion 112 of two adjacent heat exchange plates 11, Figure 2, the channel widths W1, W2, W3, etc. of the fluid channel 12 of the plate heat exchanger 10 in the width direction of the heat exchange plate 11 of this embodiment decrease from the left to the right, that is, W1>W2, W2>W3, etc., so that the resistance of the fluid channel 12 of the plate heat exchanger 10 in the width direction of the heat exchange plate 11 increases from the left to the right, so that the resistance of the fluid channel 12 on the left side close to the refrigerant inlet 113 in the width direction of the heat exchange plate 11 is smaller, which can increase the flow rate proportion of the liquid phase refrigerant on the left side close to the refrigerant inlet 113 in the width direction of the heat exchange plate 11, while the flow rate proportion of the liquid phase refrigerant on the left side close to the refrigerant inlet 113 in the width direction of the heat exchange plate 11 is increased. 3 has a larger resistance, which can reduce the flow ratio of the liquid-phase refrigerant on the right side away from the refrigerant inlet 113 in the width direction of the heat exchange plate 11. Therefore, under the premise that the refrigerant enters the fluid channel 12 of the plate heat exchanger 10 from the refrigerant inlet 113 at the same speed, the liquid-phase refrigerant with large mass and large flow inertia is subjected to the resistance of the fluid channel 12 of the plate heat exchanger 10 in the width direction when flowing in the width direction of the plate heat exchanger 10, and is distributed gradually from the left to the right side. This can effectively improve the flow distribution uniformity of the liquid-phase refrigerant in the width direction of the plate heat exchanger 10, thereby improving the heat exchange effect and further improving the heat exchange efficiency.

[0041] Since the flow distribution of the liquid refrigerant in the width direction of the plate heat exchanger 10 is more uniform, the flow pressure of the liquid refrigerant in the width direction of the plate heat exchanger 10 also tends to be uniform, which can avoid the occurrence of overheating areas in the width direction of the plate heat exchanger 10, thereby avoiding the occurrence of heat transfer deterioration, and effectively improving the heat exchange performance of the plate heat exchanger 10.

[0042] In addition, the plate heat exchanger 10 of this embodiment adopts the width center spacing A1, A2, A3, A4, A5, A6... between the centers of adjacent protrusions 111 and the centers of recessed portions 112 on the heat exchange plates 11 to decrease from the left side to the right side in the width direction of the plate heat exchanger 10, so as to evenly distribute the flow rate of the liquid refrigerant in the width direction of the plate heat exchanger 10. Without adding additional parts and assembly steps, the flow distribution uniformity of the liquid refrigerant in the width direction of the plate heat exchanger 10 can be effectively improved, thereby saving materials, simplifying the assembly production process, and further saving production costs and improving production efficiency.

[0043] In order to improve the heat exchange performance, the heat exchange plate 11 of this embodiment is basically covered by a point wave structure composed of multiple protrusions 111 and multiple recessed portions 112 except for the refrigerant inlet 113, refrigerant outlet 114, water inlet 115 and water outlet 116 at the four corners.

[0044] To further enhance the smoothness and uniformity of the fluid flow within the fluid channel 12 formed by the raised portion 111 and the recessed portion 112, the raised portion 111 of this embodiment includes a first flat plate 1111 and a first curved ring 1112, each connected to the other. The end of the first curved ring 1112, which is remote from the first flat plate 1111, smoothly transitions to the body of the heat exchange plate 11. The first curved ring 1112 is concavely curved near the body of the heat exchange plate 11. Since the shape of the recessed portion 112 of this embodiment is identical to that of the raised portion 111, the recessed portion 112 of this embodiment also includes a second flat plate 1121 and a second curved ring 1122, each connected to the other. The end of the second curved ring 1122, which is remote from the second flat plate 1121, smoothly transitions to the body of the heat exchange plate 11. The second curved ring 1122 is concavely curved near the body of the heat exchange plate 11. Specifically, the first flat plate 1111 and the second flat plate 1121 of this embodiment have the same shape, and the first curved ring 1112 and the second curved ring 1122 of this embodiment have the same shape, so that the concave portion 112 and the convex portion 111 of this embodiment have the same shape.

[0045] Specifically, in this embodiment, the first flat plate 1111 of the raised portion 111 and the second flat plate 1121 of the recessed portion 112 are both arranged in a circular shape. The circular first flat plate 1111 and the circular second flat plate 1121 of the raised portion 111 and the recessed portion 112 form a circular welding surface, thereby ensuring the welding area and further ensuring the tightness of the welding.

[0046] Furthermore, in this embodiment, the difference between two adjacent width center spacings is a decreasing difference, and each of these decreasing differences is the same fixed difference d. Specifically, the width center spacings A1, A2, A3, A4, A5, A6, etc. between the centers of adjacent protrusions 111 and recesses 112 vary linearly along the width direction of the heat exchange plate 11, taking the form of a fixed difference d, i.e., A2 = A1-d, A3 = A2-d, A4 = A3-d, A5 = A4-d, A6 = A5-d, etc. This fixed difference d is related to the width of the heat exchange plate 11, the arrangement density of the protrusions 111 and recesses 112, and the size of the protrusions 111 and recesses 112. It should be a reasonable value to ensure that adjacent protrusions 111 and recesses 112 do not overlap.

[0047] Optionally, in this embodiment, the width center spacing A1, A2, A3, A4, A5, A6... between the centers of adjacent protrusions 111 and the centers of recessed portions 112 in the width direction of the heat exchange plate 11 is Y, and the position distance between the protrusion 111 or the recessed portion 112 and the left side of the heat exchange plate 11 in the width direction of the heat exchange plate 11 is X, and the width center spacing Y and its corresponding position distance X form a decreasing function law selected from linear, quadratic, logarithmic, and exponential.

[0048] Combine Figure 3 and Figure 8 In this embodiment, the plurality of protrusions 111 and the plurality of recesses 112 are alternately arranged at equal intervals along the height direction of the heat exchange plate 11, such that the center-to-center spacings B1, B2, B3, B4, B5, B6, ... between the centers of adjacent protrusions 111 and recesses 112 along the height direction of the heat exchange plate 11 remain constant, i.e., B1 = B2 = B3 = B4 = B5 = B6. ... Since the center-to-center spacings B1, B2, B3, B4, B5, B6, ... between the centers of adjacent protrusions 111 and recesses 112 along the height direction of the heat exchange plate 11 remain constant, the channel heights H11, H21, H31, ... of the fluid channels 12 of the plate heat exchanger 10 of this embodiment along the height direction of the plate heat exchanger 10 are also consistent, i.e., H11 = H21 = H31. ...

[0049] The second embodiment of the plate heat exchanger:

[0050] As an explanation of the second embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0051] See also Figure 10 In this embodiment, the first flat plate 1111' of the raised portion 111' and the second flat plate 1121' of the recessed portion 112' of the heat exchange plate 11' are both square-shaped. The square first flat plate 1111' and the square second flat plate 1121' of the raised portion 111' and the recessed portion 112' form a square welding surface, thereby increasing the welding area and improving the tightness of the welding.

[0052] Optionally, the first planar plate 1111' of the raised portion 111' and the second planar plate 1121' of the recessed portion 112' are in one of the shapes of an ellipse, a convex shape, a parallelogram, a trapezoid, a rhombus, a crescent shape, a triangle, a rectangle, and a hexagon, so as to adjust and change the flow direction of the fluid in the fluid channel formed by the raised portion 111' and the recessed portion 112' while ensuring the welding area and welding tightness, so as to improve the heat exchange performance.

[0053] The third embodiment of the plate heat exchanger:

[0054] As an explanation of the third embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0055] See also Figure 11, in this embodiment, the height center distances H12, H22, H32... between the centers of adjacent convex portions 111 and the centers of concave portions 112 decrease from the upper end to the lower end in the height direction of the heat exchange plate 11, that is, the height center distances H12, H22, H32... between the centers of adjacent convex portions 111 and the centers of concave portions 112 increase from the lower end to the upper end in the height direction of the heat exchange plate 11, so that the flow area of the fluid channel 12 at the lower end near the refrigerant inlet 113 is smaller, while the flow area of the fluid channel 12 at the upper end near the refrigerant outlet 114 is larger, that is, H12 < H22 < H32..., thus as the refrigerant entering the fluid channel 12 from the refrigerant inlet 113 at the lower end exchanges heat, the proportion of gaseous refrigerant gradually increases and the proportion of liquid refrigerant gradually decreases. And under the same mass, the volume of gas is relatively larger than that of liquid. The height center distances H12, H22, H32... between the centers of adjacent convex portions 111 and the centers of concave portions 112 increase from the lower end to the upper end in the height direction of the heat exchange plate 11, which can increase the flow area at the upper end near the refrigerant outlet | 114 to effectively increase the flow rate of the gaseous refrigerant at the upper end near the refrigerant outlet 114, thereby avoiding the phenomenon of pressure drop loss at the upper end near the refrigerant outlet 114, so that the gaseous refrigerant after heat exchange can be quickly discharged from the refrigerant outlet 114 at the upper end to supply external equipment.

[0056] Fourth embodiment of the plate heat exchanger:

[0057] As an illustration of the fourth embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger will be described below.

[0058] See Figure 12 , in this embodiment, the height center distances H13, H23, H33... between the centers of adjacent convex portions 111 and the centers of concave portions 112 increase from the upper end to the lower end in the height direction of the heat exchange plate 11, that is, the height center distances H13, H23, H33... between the centers of adjacent convex portions 111 and the centers of concave portions 112 decrease from the lower end to the upper end in the height direction of the heat exchange plate 11, so that the resistance of the fluid channel 12 at the lower end near the refrigerant inlet 113 is smaller, while the resistance of the fluid channel 12 at the upper end near the refrigerant outlet 114 is larger, that is, H13 > H23 > H33..., thereby effectively improving the heat exchange performance.

[0059] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles of the scope of the patent application of the present invention should be included within the scope of the patent application of the present invention.

Claims

1. A heat exchange plate having a refrigerant inlet, a refrigerant outlet, a water inlet, and a water outlet formed therethrough, wherein the refrigerant inlet, the refrigerant outlet, the water inlet, and the water outlet are respectively arranged at the four corners of the heat exchange plate, characterized in that: The refrigerant inlet and the refrigerant outlet are arranged near the left side of the heat exchange plate in the width direction of the heat exchange plate, the water inlet and the water outlet are arranged near the right side of the heat exchange plate in the width direction, and the refrigerant outlet and the water inlet are arranged near the upper end of the heat exchange plate in the height direction of the heat exchange plate, and the refrigerant inlet and the water outlet are arranged near the lower end of the heat exchange plate in the height direction; The heat exchange area of ​​the heat exchange plate is provided with a point wave structure, and the point wave structure includes a plurality of protrusions and a plurality of recessed portions, wherein the protrusions are provided to protrude outward from the front surface of the heat exchange plate, and the recessed portions are provided to protrude outward from the back surface of the heat exchange plate, and the back surface and the front surface are arranged opposite to each other in the thickness direction of the heat exchange plate, and the plurality of protrusions and the plurality of recessed portions are alternately arranged in the width direction and the height direction, respectively, and the shapes of the protrusions and the recessed portions are the same; In the width direction, the width center distance between the centers of adjacent protrusions and the centers of adjacent recesses decreases from the left side toward the right side; The difference between two adjacent width center distances is a decreasing difference, and the multiple decreasing differences are all the same fixed difference; Alternatively, the width center spacing is Y, the position distance between the protrusion or the recessed portion and the left side in the width direction is X, and a function decreasing rule of linear, quadratic, logarithmic, or exponential is formed between the width center spacing Y and its corresponding position distance X.

2. The heat exchange plate according to claim 1, characterized in that: The plurality of protrusions and the plurality of depressions are alternately arranged at equal intervals in the height direction.

3. The heat exchange plate according to claim 1, characterized in that: In the height direction, the height center distance between the centers of adjacent protrusions and the centers of adjacent recesses decreases from the upper end toward the lower end.

4. The heat exchange plate according to claim 1, characterized in that: In the height direction, the height center distance between the centers of adjacent protrusions and the centers of adjacent recesses increases from the upper end toward the lower end.

5. The heat exchange plate according to any one of claims 1 to 4, characterized in that: The raised portion includes a connected flat plate and a curved ring. One end of the curved ring away from the flat plate is smoothly connected to the plate body of the heat exchange plate, and the curved ring is concavely curved close to the plate body.

6. The heat exchange plate according to claim 5, characterized in that: The plane plate is in a shape selected from the group consisting of a circle, an ellipse, a convex shape, a parallelogram, a trapezoid, a rhombus, a crescent shape, a triangle, a square, a rectangle, and a hexagon.

7. A plate heat exchanger comprising at least two heat exchange plates, characterized in that: The heat exchange plate is the heat exchange plate according to any one of claims 1 to 6; The plurality of heat exchange plates are stacked in the thickness direction of the plate heat exchanger, and among two adjacent heat exchange plates, the raised portion of one heat exchange plate contacts the recessed portion of the other heat exchange plate to form a fluid channel.

8. A heat exchange system including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger described in claim 7 above.

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