Fluid distribution structure of plate heat exchanger

Abstract

The utility model provides a fluid distribution structure of a plate heat exchanger, and belongs to the technical field of heat exchangers. A fluid distribution structure of a plate heat exchanger comprises a plurality of heat exchange plate bundles which are arranged in a stacked mode, and a refrigerant flow channel for a refrigerant to pass through is formed between every two adjacent heat exchange plate bundles. The heat exchange plate bundle is provided with a pipe hole, an annular throttling crack is formed around the pipe hole, an annular flow cavity is formed around the annular throttling crack, and the annular throttling crack is communicated with the pipe hole; the annular crack is communicated with the annular flow cavity through at least one first throttling channel; the heat exchange plate bundle is provided with a second throttling channel communicating with the annular flow cavity, and throttling holes communicating with the refrigerant flow channel are formed in the inner wall of the second throttling channel.

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 type heat exchanger. Background Art

[0002] In refrigeration systems, brazed plate heat exchangers are often used as evaporators. The refrigerant inlet dryness is about 0.3, which is a gas-liquid two-phase state. For plate heat exchangers, the inlet structure has an important influence on the refrigerant flow state. A reasonable inlet structure can suppress the gas-liquid separation during the flow process. The gas-liquid separation will cause the various flow channels of the heat exchanger to not obtain consistent refrigerant flow, which is manifested as gas and liquid flowing through different flow channels. This gas-liquid uneven flow has a huge impact on the performance of the plate evaporator, especially when there are a large number of flow channels. Summary of the invention

[0003] The purpose of the utility model is to address the above-mentioned problems in the existing technology and propose a fluid distribution structure for a plate heat exchanger, which can achieve four-time throttling and multiple pressure reduction atomization. Compared with single throttling, multiple throttling can further improve the refrigerant distribution and make it evenly distributed.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A fluid distribution structure of a plate heat exchanger, comprising: a plurality of stacked heat exchange plate bundles, with a refrigerant flow channel for refrigerant to pass through formed between adjacent heat exchange plate bundles; the heat exchange plate bundle has a tube hole, an annular throttling gap arranged around the tube hole, and an annular flow cavity arranged around the annular throttling gap, and the annular throttling gap is connected to the tube hole; the annular gap is connected to the annular flow cavity through at least one first throttling channel; the heat exchange plate bundle is provided with a second throttling channel connected to the annular flow cavity, and the inner wall of the second throttling channel is provided with a throttling hole connected to the refrigerant flow channel.

[0006] In the fluid distribution structure of the plate heat exchanger, the heat exchange plate bundle includes a first plate and a second plate; the first plate has an annular convex portion and a first annular portion located between the annular convex portion and the tube hole, the second plate has an annular concave portion and a second annular portion located between the annular concave portion and the tube hole, and a gap is provided between the second annular portion and the first annular portion; the second plate is provided with the second throttling channel, and the throttling hole is opened on the inner wall of the second throttling channel; the first annular portion is provided with a plurality of recessed grooves, and the recessed grooves have a spacing with the inner circle of the first annular portion; the second annular portion is provided with a plurality of protruding grooves, and the protruding grooves correspond to and are fixedly connected with the recessed grooves to form a sealing portion, and the first throttling channel is formed between adjacent sealing portions.

[0007] In the fluid distribution structure of the plate heat exchanger, there are a plurality of first throttling channels, which are distributed in a circumferential array around the first annular flow cavity.

[0008] In the fluid distribution structure of the plate heat exchanger, the heat exchange plate bundle includes a first plate and a second plate; the first plate has an annular convex portion and a first annular portion located between the annular convex portion and the tube hole, the second plate has an annular concave portion and a second annular portion located between the annular concave portion and the tube hole, and a gap is provided between the second annular portion and the first annular portion; the second plate is provided with the second throttling channel, and the throttling hole is opened on the inner wall of the second throttling channel; the first annular portion is provided with a recessed groove arranged along the annular convex portion, and the recessed groove has a spacing with the inner circle of the first annular portion; the second annular portion is provided with a protruding groove, and the protruding groove corresponds to and is fixedly connected with the recessed groove to form a sealing portion, and the first throttling channel is formed between the two ends of the sealing portion.

[0009] In the fluid distribution structure of the plate heat exchanger, there is one first throttling channel.

[0010] In the above fluid distribution structure of the plate heat exchanger, the second throttling channel is arranged on the second plate, and the second throttling channel extends in a direction away from the center of the second annular groove.

[0011] In the fluid distribution structure of the plate heat exchanger, the width of the first throttling channel is 0.8-2.5 mm.

[0012] In the fluid distribution structure of the plate heat exchanger, the diameter of the throttling hole is 0.5 mm to 2.0 mm, and the width of the second throttling channel is larger than the diameter of the throttling hole and smaller than the minimum diameter of the second annular flow cavity.

[0013] Compared with the prior art, this application has the following advantages:

[0014] The present application can realize four-time throttling and multiple pressure reduction atomization. Compared with single throttling, multiple throttling can further improve the refrigerant distribution and make it evenly distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural diagram of a plate heat exchanger in the first embodiment;

[0016] Figure 2 is a partial cross-sectional structural diagram of the fluid distribution structure in the first embodiment;

[0017] Figure 3 This is a structural diagram of the first embodiment after the first plate and the second plate are separated.

[0018] Figure 4is a three-dimensional structural diagram of a plate heat exchanger in the second embodiment;

[0019] Figure 5 is a partial cross-sectional structural diagram of the fluid distribution structure in the second embodiment;

[0020] Figure 6 This is a structural diagram of the second embodiment after the first plate and the second plate are separated

[0021] In the figure,

[0022] 2. Heat exchange plate bundle; 21. Tube hole; 22. Annular throttling gap; 23. Annular flow cavity; 24. First throttling channel; 25. Second throttling channel; 26. Throttling hole;

[0023] 3. Refrigerant flow channel;

[0024] 4. first plate; 41. annular convex portion; 42. first annular portion; 421. concave groove;

[0025] 5. second plate; 51. annular recess; 52. second annular portion; 521. protruding groove;

[0026] 6. Sealing part. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 6 As shown, a fluid distribution structure of a plate heat exchanger comprises: a plurality of stacked heat exchange plate bundles 2, wherein a refrigerant flow channel 3 for refrigerant to pass through is formed between adjacent heat exchange plate bundles 2; the heat exchange plate bundle 2 has a tube hole 21, an annular throttling gap 22 arranged around the tube hole 21, and an annular flow cavity 23 arranged around the annular throttling gap 22, and the annular throttling gap 22 is connected to the tube hole 21; the annular gap is connected to the annular flow cavity 23 through at least one first throttling channel 24; a second throttling channel 25 connected to the annular flow cavity 23 is provided on the heat exchange plate bundle 2, and a throttling hole 26 connected to the refrigerant flow channel 3 is opened on the inner wall of the second throttling channel 25.

[0029] In the present application, the refrigerant first enters the tube hole 21, then enters the first throttling channel 24 through the annular throttling gap 22, and then enters the annular flow cavity 23. The annular throttling gap 22 plays a certain initial throttling role, which can be regarded as the first throttling. This step is also conducive to the uniform distribution of gas-liquid refrigerant. Then, when entering the first throttling channel 24, a throttling effect is also performed, which can be regarded as the second throttling. Subsequently, the refrigerant passes through the second throttling channel 25 from the annular flow cavity 23, forming a third throttling, and finally enters the refrigerant flow channel 3 through the throttling hole 26, forming a fourth throttling.

[0030] Compared with traditional plate heat exchangers, the present application has more throttling times, which greatly suppresses the phenomenon of gas-liquid separation during the flow process. Each throttling can make the refrigerant more evenly distributed, and a consistent refrigerant flow rate flows into each refrigerant flow channel 3, thereby greatly improving the performance of the plate evaporator.

[0031] The present application can realize four-time throttling and multiple pressure reduction atomization. Compared with single throttling, multiple throttling can further improve the refrigerant distribution and make it evenly distributed.

[0032] Specifically, Figures 2 to 3 As shown, the heat exchange plate bundle 2 includes a first plate 4 and a second plate 5; the first plate 4 has an annular convex portion 41 and a first annular portion 42 located between the annular convex portion 41 and the tube hole 21, the second plate 5 has an annular concave portion 51 and a second annular portion 52 located between the annular concave portion 51 and the tube hole 21, and a gap is provided between the second annular portion 52 and the first annular portion 42; the second plate 5 is provided with a second throttling channel 25, and the throttling hole 26 is opened on the inner wall of the second throttling channel 25; a plurality of concave grooves 421 are provided on the first annular portion 42, and the concave grooves 421 have a spacing with the inner circle of the first annular portion 42; a plurality of protruding grooves 521 are provided on the second annular portion 52, and the protruding grooves 521 correspond to and are fixedly connected with the concave grooves 421 to form a sealing portion 6, and a first throttling channel 24 is formed between adjacent sealing portions 6.

[0033] The first plate 4 and the second plate 5 are brazed and connected to form structures such as the annular flow chamber 23, the first throttling channel 24, and the second throttling channel 25.

[0034] The design is that the structure of each first plate 4 can be the same, and the structure of each second plate 5 can be the same, which is easier in the subsequent installation process and saves costs. Part of the gap on the side facing the pipe hole 21 is used as an annular throttling gap 22.

[0035] Specifically, Figures 1 to 3 As shown, there are a plurality of first throttling passages 24 , which are distributed in a circumferential array around the first annular flow chamber 23 .

[0036] Specifically, Figures 4 to 6 As shown, the heat exchange plate bundle 2 includes a first plate 4 and a second plate 5; the first plate 4 has an annular convex portion 41 and a first annular portion 42 located between the annular convex portion 41 and the tube hole 21, the second plate 5 has an annular concave portion 51 and a second annular portion 52 located between the annular concave portion 51 and the tube hole 21, and a gap is provided between the second annular portion 52 and the first annular portion 42; the second plate 5 is provided with a second throttling channel 25, and the throttling hole 26 is opened on the inner wall of the second throttling channel 25; the first annular portion 42 is provided with a concave groove 421 arranged along the annular convex portion 41, and the concave groove 421 has a spacing with the inner circle of the first annular portion 42; the second annular portion 52 is provided with a protruding groove 521, and the protruding groove 521 corresponds to and is fixedly connected with the concave groove 421 to form a sealing portion 6, and a first throttling channel 24 is formed between the two ends of the sealing portion 6.

[0037] The first plate 4 and the second plate 5 are brazed and connected to form structures such as the annular flow chamber 23, the first throttling channel 24, and the second throttling channel 25.

[0038] The design is that the structure of each first plate 4 can be the same, and the structure of each second plate 5 can be the same, which is easier in the subsequent installation process and saves costs. Part of the gap on the side facing the pipe hole 21 is used as an annular throttling gap 22.

[0039] Specifically, Figures 4 to 6 As shown, the first throttle passage 24 has one.

[0040] Specifically, the second throttling channel 25 is provided on the second plate 5, and the second throttling channel 25 extends in a direction away from the center of the second annular groove.

[0041] Specifically, the width of the first throttling channel 24 is 0.8-2.5 mm.

[0042] Specifically, the diameter of the throttle hole 26 is 0.5 mm to 2.0 mm, and the width of the second throttle channel 25 is greater than the diameter of the throttle hole 26 and smaller than the minimum diameter of the second annular flow cavity 23 .

[0043] This design can achieve throttling when the refrigerant enters the second throttling channel 25 from the second annular flow cavity 23, and achieve throttling when the refrigerant enters the second throttling hole 26 in the second throttling channel 25, thereby improving the effect of suppressing gas-liquid separation and achieving better heat exchange effect.

[0044] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative position relationship and movement status of the components in a certain specific posture, as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their 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. At the same time, the meaning of "and / or" appearing in the full text is that it includes three schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] The above components are all common standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A fluid distribution structure of a plate heat exchanger, characterized in that: include: A plurality of stacked heat exchange plate bundles (2) are provided, and a refrigerant flow channel (3) for refrigerant to pass through is formed between adjacent heat exchange plate bundles (2); the heat exchange plate bundle (2) has a tube hole (21), an annular throttling slit (22) arranged around the tube hole (21), and an annular flow cavity (23) arranged around the annular throttling slit (22), and the annular throttling slit (22) is connected to the tube hole (21); the annular throttling slit is connected to the annular flow cavity (23) through at least one first throttling channel (24); a second throttling channel (25) connected to the annular flow cavity (23) is provided on the heat exchange plate bundle (2), and a throttling hole (26) connected to the refrigerant flow channel (3) is opened on the inner wall of the second throttling channel (25).

2. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The heat exchange plate bundle (2) comprises a first plate (4) and a second plate (5); the first plate (4) has an annular convex portion (41) and a first annular portion (42) located between the annular convex portion (41) and the tube hole (21); the second plate (5) has an annular concave portion (51) and a second annular portion (52) located between the annular concave portion (51) and the tube hole (21); a gap is provided between the second annular portion (52) and the first annular portion (42); the second plate (5) is provided with the second flow section The second throttling channel (25) is provided with a plurality of recessed grooves (421), and a spacing is provided between the recessed grooves (421) and the inner ring of the first annular portion (42); the second annular portion (52) is provided with a plurality of protruding grooves (521), and the protruding grooves (521) correspond to and are fixedly connected with the recessed grooves (421) to form a sealing portion (6), and the first throttling channel (24) is formed between adjacent sealing portions (6).

3. The fluid distribution structure of the plate heat exchanger according to claim 2, characterized in that: There are a plurality of first throttling channels (24), which are distributed in a circumferential array around the first annular flow chamber (23).

4. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The heat exchange plate bundle (2) comprises a first plate (4) and a second plate (5); the first plate (4) has an annular convex portion (41) and a first annular portion (42) located between the annular convex portion (41) and the tube hole (21); the second plate (5) has an annular concave portion (51) and a second annular portion (52) located between the annular concave portion (51) and the tube hole (21); a gap is provided between the second annular portion (52) and the first annular portion (42); the second plate (5) is provided with the second throttling channel (25 ), the throttling hole (26) is opened on the inner wall of the second throttling channel (25); the first annular surface portion (42) is provided with a recessed groove (421) arranged along the annular convex portion (41), and the recessed groove (421) and the inner circle of the first annular surface portion (42) have a spacing; the second annular surface portion (52) is provided with a protruding groove (521), and the protruding groove (521) corresponds to and is fixedly connected with the recessed groove (421) to form a sealing portion (6), and the first throttling channel (24) is formed between the two ends of the sealing portion (6).

5. The fluid distribution structure of the plate heat exchanger according to claim 4, characterized in that: The first throttling passage (24) has one.

6. The fluid distribution structure of the plate heat exchanger according to claim 2 or 4, characterized in that: The second throttling channel (25) is arranged on the second plate (5), and the second throttling channel (25) extends in a direction away from the center of the second annular groove.

7. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The width of the first throttling channel (24) is 0.8-2.5 mm.

8. The fluid distribution structure of the plate heat exchanger according to claim 1, characterized in that: The diameter of the throttling hole (26) is 0.5 mm to 2.0 mm, and the width of the second throttling channel (25) is greater than the diameter of the throttling hole (26) and less than the minimum diameter of the second annular flow cavity (23).

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