Fluid distribution structure of plate heat exchanger plate

Abstract

The utility model provides a fluid distribution structure of a plate heat exchanger plate, and belongs to the technical field of heat exchangers. A fluid distribution structure of a plate heat exchanger plate comprises a first plate and a second plate, and the first plate and the second plate are connected through brazing. The first plate sheet is provided with an annular boss, the inner ring of the annular boss is provided with a first annular flange, the second plate sheet is provided with an annular concave platform, the inner ring of the annular concave platform is provided with a second annular flange, and a throttling crack is formed between the first annular flange and the second annular flange. The utility model has the advantages of being beneficial to uniform distribution of gas-liquid coolants, integrally formed and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, in particular to a fluid distribution structure of a plate heat exchanger plate. Background Art

[0002] In refrigeration systems, brazed plate heat exchangers are often used as evaporators. The refrigerant inlet dryness is around 0.3 and is in a gas-liquid two-phase state.

[0003] For plate heat exchangers, the inlet structure has a significant impact on the refrigerant flow pattern. A reasonable inlet structure can suppress the occurrence of gas-liquid separation during the flow process, because gas-liquid separation will prevent the flow channels of the heat exchanger from obtaining consistent refrigerant flow, and the gas and liquid will flow through different flow channels respectively. This uneven gas-liquid flow has a significant impact on the performance of the plate evaporator, especially when there are a large number of flow channels.

[0004] For example, in the patent number CN202410956694, named "A fluid distribution structure for a plate heat exchanger", it is necessary to open a circular hole on some plates for the first throttling, and then brazing is required, which will increase the difficulty of plate processing and subsequent treatment. Summary of the Invention

[0005] The purpose of the utility model is to address the above-mentioned problems in the existing technology and propose a fluid distribution structure for plate heat exchanger plates, which has the characteristics of being conducive to uniform distribution of gas-liquid refrigerant, integrally formed and low cost.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A fluid distribution structure for a plate heat exchanger plate includes: a first plate and a second plate, wherein the first plate and the second plate are connected by brazing; the first plate has an annular boss, the inner ring of the annular boss has a first annular flange, the second plate has an annular recess, the inner ring of the annular recess has a second annular flange, and a throttling gap is formed between the first annular flange and the second annular flange.

[0008] In the fluid distribution structure of the plate heat exchanger plate, the annular boss of the first plate and the annular recess of the second plate are combined to form an annular cavity, and the height of the annular cavity is greater than the gap size of the throttling gap between the first annular flange and the second annular flange.

[0009] In the fluid distribution structure of the plate heat exchanger plate, a plurality of first notches are provided along the lower edge of the first annular flange, and a plurality of second notches are provided along the upper edge of the second annular flange, and the first notches and the second notches correspond to each other one by one.

[0010] In the above-mentioned fluid distribution structure of the plate heat exchanger plate, the height of the first annular flange is smaller than the depth of the annular boss, and the height of the second annular flange is smaller than the depth of the annular recess.

[0011] In the fluid distribution structure of the plate heat exchanger plate, the height of the first annular flange is greater than 1 / 2 of the depth of the annular boss, and the height of the second annular flange is greater than 1 / 2 of the depth of the annular recess.

[0012] In the fluid distribution structure of the plate heat exchanger plate, the size of the throttling gap is 0.3-2.5 mm.

[0013] In the above-mentioned fluid distribution structure of the plate heat exchanger plate, the sizes of the annular projection and the annular recess correspond to each other.

[0014] In the fluid distribution structure of the plate heat exchanger plate, the second plate has a flow channel extending away from the annular cavity, the flow channel is connected to the annular cavity, and a throttling hole is opened at one end of the flow channel away from the annular cavity.

[0015] In the fluid distribution structure of the plate heat exchanger plate, the throttling hole has a diameter of 0.5 mm to 2.0 mm.

[0016] In the above-mentioned fluid distribution structure of the plate heat exchanger plate, the first plate, the annular boss, and the first annular flange are an integrally formed structure.

[0017] In the above-mentioned fluid distribution structure of the plate heat exchanger plate, the second plate, the annular concave platform and the second annular flange are an integrally formed structure.

[0018] Compared with the prior art, this application has the following advantages:

[0019] In the present application, when the refrigerant enters the fluid distribution structure of the plate heat exchanger plate, the refrigerant flows in from the throttling gap. When the refrigerant flows through this gap, it is subjected to the throttling effect. This throttling effect will change the flow characteristics of the refrigerant, especially for the gas-liquid two-phase refrigerant, which can be effectively distributed and regulated, and can enable the refrigerant to form an ideal flow state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural diagram of the first plate and the second plate in this application;

[0021] Figure 2 This is a partial structural diagram of the first plate and the second plate after brazing in this application;

[0022] Figure 3 is a three-dimensional diagram of the plate heat exchanger in this application;

[0023] Figure 4 It is a cross-sectional view of the position of the annular cavity in this application;

[0024] Figure 5 is a partial cross-sectional schematic diagram of another embodiment of the present application;

[0025] Figure 6 It is a partial cross-sectional schematic diagram of another embodiment of the present application;

[0026] Figure 7 It is a simulation constant velocity line diagram in this application;

[0027] Figure 8 It is a simulation constant velocity line diagram of the prior art;

[0028] In the figure,

[0029] 100. Circular tube inlet;

[0030] 2. First plate; 21. Annular boss; 211. First annular flange; 2111. First notch;

[0031] 3. Second plate; 31. Annular concave platform; 311. Second annular flange; 3111. Second notch; 32. Flow channel; 33. Throttle hole;

[0032] 4. Throttling gap;

[0033] 5. Annular cavity. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-Figure 4 The present application is further described with reference to the following specific examples:

[0035] First of all, it should be noted that in the description of this application, if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and other directional words appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application; in addition, if the terms "first", "second", "third" and other numerical quantifiers appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", and "connected" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an interference fit, a transition fit and other limited connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; therefore, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] Figure 7 、 Figure 8 The simulation velocity line diagram simulated for this application is shown below. Figure 7 The middle is the simulation situation when the throttle gap 4 is set.

[0037] like Figures 1 to 4 As shown, a fluid distribution structure of a plate heat exchanger plate includes: a first plate 2 and a second plate 3, the first plate 2 and the second plate 3 are connected by brazing; the first plate 2 has an annular boss 21, the inner ring of the annular boss 21 has a first annular flange 211, the second plate 3 has an annular recess 31, the inner ring of the annular recess 31 has a second annular flange 311, and a throttling gap 4 is formed between the first annular flange 211 and the second annular flange 311.

[0038] In the present application, when the refrigerant enters the fluid distribution structure of the plate heat exchanger plate, the refrigerant flows in from the throttling gap 4. When the refrigerant flows through this gap, it is subjected to throttling. This throttling effect will change the flow characteristics of the refrigerant, especially for the gas-liquid two-phase refrigerant, which can be effectively distributed and regulated, and can promote the refrigerant to form an ideal flow state.

[0039] In the present application, after multiple first plates 2 and second plates 3 are alternately stacked, a design similar to a circular tube-type inlet 100 can be formed, and a circulation state is formed by entering from the throttling gap 4. The throttling gap formed by the first annular flange 211 and the second annular flange 311 can effectively guide the refrigerant, so that the gas-liquid refrigerant is more evenly distributed in the heat exchanger plates.

[0040] During the flow of the refrigerant, the throttling effect generated by the throttling gap 4 causes the refrigerant to be depressurized and atomized. Compared with the traditional structure with only one throttling, this multiple throttling design can further improve the uniformity of the refrigerant distribution.

[0041] Specifically, if Figures 1 to 6 As shown, the annular boss 21 of the first plate 2 and the annular recess 31 of the second plate 3 are combined to form an annular cavity 5, and the height of the annular cavity 5 is greater than the gap size of the throttling gap 4 between the first annular flange 211 and the second annular flange 311.

[0042] The annular cavity 5 provides a buffer space for the refrigerant, allowing the refrigerant to undergo preliminary adjustment and distribution within the annular cavity 5 before entering the throttling gap 4. This design of the throttling gap 4 allows the refrigerant to enter the annular cavity 5 more evenly, which helps to improve the uniformity and stability of the refrigerant flow throughout the heat exchanger.

[0043] Specifically, if Figures 5 and 6As shown, a plurality of first notches 2111 are provided along the lower edge of the first annular flange 211 , and a plurality of second notches 3111 are provided along the upper edge of the second annular flange 311 , and the first notches 2111 and the second notches 3111 correspond to each other one by one.

[0044] Furthermore, from a molding process perspective, to prevent wavy wrinkles from forming on the flanges, first notches 2111 and second notches 3111 can be provided on the first annular flange 211 and the second annular flange 311. The first notches 2111 and the second notches 3111 are rectangular or triangular in shape. The first notches 2111 are evenly spaced on the first annular flange 211, and the second notches 3111 are evenly spaced on the second annular flange 311.

[0045] Specifically, if Figure 4 As shown, the height H3 of the first annular flange 211 is smaller than the depth H1 of the annular boss 21 , and the height H4 of the second annular flange 311 is smaller than the depth H2 of the annular recess 31 .

[0046] From a processing perspective, this dimensional design is more conducive to the implementation of the processing technology. When processing the plate, it is relatively easier to control the height of the first annular flange 211 and the second annular flange 311 and the depth of the annular boss 21 and the annular recess 31, reducing the processing difficulty and scrap rate, thereby helping to control production costs and improve production efficiency.

[0047] Furthermore, the presence of the first annular flange 211 and the second annular flange 311 can also enhance the strength of this position.

[0048] Specifically, if Figure 4 As shown, the height H3 of the first annular flange 211 is greater than 1 / 2 of the depth H1 of the annular boss 21 , and the height H4 of the second annular flange 311 is greater than 1 / 2 of the depth H2 of the annular recess 31 .

[0049] Specifically, the size of the throttling gap 4 is 0.3 to 2.5 mm.

[0050] This size range is conducive to the full mixing and uniform distribution of the gas-liquid two-phase refrigerant during the throttling process. The narrow gap causes the refrigerant to generate strong disturbances when passing through, allowing the gas and liquid two phases to better interact and mix, avoiding the aggravation of the gas-liquid separation phenomenon.

[0051] Specifically, the annular projection 21 and the annular recess 31 have corresponding sizes.

[0052] The corresponding size of the two helps to stabilize the structure of the annular cavity 5. The stability of the annular cavity 5 is crucial for the flow and state adjustment of the refrigerant therein. Appropriate size matching can enable the annular cavity 5 to maintain a stable shape when subjected to changes in refrigerant pressure.

[0053] Specifically, if Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 As shown, the second plate 3 has a flow channel 32 extending in a direction away from the annular cavity 5 , the flow channel 32 is communicated with the annular cavity 5 , and a throttling hole 33 is opened at one end of the flow channel 32 away from the annular cavity 5 .

[0054] The flow channel 32 extends away from the annular cavity 5, providing a clear flow path for the refrigerant flowing out of the annular cavity 5, so that the refrigerant can flow in an orderly manner in the plate, and a throttling hole 33 is provided at one end of the flow channel 32 away from the annular cavity 5 to achieve further throttling of the refrigerant.

[0055] This structural design helps to improve the uniformity of refrigerant distribution. The throttle hole 33 performs secondary throttling on the refrigerant, making the flow and pressure of the refrigerant in different flow channels 32 more balanced, avoiding the problem of uneven heat exchange caused by excessive or insufficient local refrigerant flow, thereby improving the heat exchange efficiency of the entire plate heat exchanger.

[0056] Specifically, the diameter of the throttle hole 33 is 0.5 mm to 2.0 mm.

[0057] Specifically, the first plate 2, the annular boss 21, and the first annular flange 211 are an integrally formed structure.

[0058] Specifically, the second plate 3 , the annular recess 31 , and the second annular flange 311 are an integrally formed structure.

[0059] The one-piece molding manufacturing method is conducive to improving processing accuracy. During the production process, compared with the method of processing each component separately and then assembling them, one-piece molding can reduce the dimensional deviation problem caused by assembly errors. At the same time, this manufacturing process can be completed in one go through a specific mold or processing method, which improves production efficiency and reduces production costs.

[0060] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A fluid distribution structure for a plate heat exchanger, characterized in that: include: A first plate (2) and a second plate (3), wherein the first plate (2) and the second plate (3) are connected by brazing; the first plate (2) has an annular boss (21), the inner ring of the annular boss (21) has a first annular flange (211), the second plate (3) has an annular recess (31), the inner ring of the annular recess (31) has a second annular flange (311), and a throttling gap (4) is formed between the first annular flange (211) and the second annular flange (311).

2. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The annular boss (21) of the first plate (2) and the annular recess (31) of the second plate (3) are combined to form an annular cavity (5), and the height of the annular cavity (5) is greater than the gap size of the throttling gap (4) between the first annular flange (211) and the second annular flange (311).

3. The fluid distribution structure of the plate heat exchanger according to claim 2, characterized in that: A plurality of first notches (2111) are provided along the lower edge of the first annular flange (211), and a plurality of second notches (3111) are provided along the upper edge of the second annular flange (311), and the first notches (2111) and the second notches (3111) correspond one to one.

4. The fluid distribution structure of the plate heat exchanger according to claim 2, characterized in that: The height H3 of the first annular flange (211) is smaller than the depth H1 of the annular boss (21), and the height H4 of the second annular flange (311) is smaller than the depth H2 of the annular recess (31).

5. The fluid distribution structure of the plate heat exchanger according to claim 3, characterized in that: The height H3 of the first annular flange (211) is greater than 1 / 2 of the depth H1 of the annular boss (21), and the height H4 of the second annular flange (311) is greater than 1 / 2 of the depth H2 of the annular recess (31).

6. The fluid distribution structure of the plate heat exchanger according to claim 4, characterized in that: The size of the throttling gap (4) is 0.3-2.5 mm.

7. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The annular boss (21) and the annular recess (31) have corresponding sizes.

8. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The second plate (3) has a flow channel (32) extending in a direction away from the annular cavity (5), the flow channel (32) is connected to the annular cavity (5), and a throttling hole (33) is provided at one end of the flow channel (32) away from the annular cavity (5).

9. The fluid distribution structure of the plate heat exchanger according to claim 8, characterized in that: The throttle hole (33) has a diameter of 0.5 mm to 2.0 mm.

10. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The first plate (2), the annular boss (21), and the first annular flange (211) are an integrally formed structure; and the second plate (3), the annular recess (31), and the second annular flange (311) are an integrally formed structure.

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