Core structure of multi-pass heat exchanger

Abstract

The application discloses a core structure of a multi-flow heat exchanger, which comprises a distribution assembly, a guide assembly and a plurality of flow groups; the plurality of flow groups comprise a first flow group for connecting a refrigerant input port and a tail flow group for connecting a refrigerant output port; the distribution assembly is provided with an input-output flow channel connected with the refrigerant input port and the refrigerant output port; the distribution assembly or the guide assembly is provided with inter-column communication flow channels and / or inter-row communication flow channels; each inter-column communication flow channel covers at least two flow groups in the same row; each inter-row communication flow channel covers at least two flow groups in the same column; and the plurality of flow groups form a refrigerant passage from the first flow group to the tail flow group through the flow channels in the distribution assembly and the guide assembly. The application makes the heat exchanger more compact in space, improves the flow speed of the internal refrigerant and improves the heat exchange effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchanger manufacturing, in particular to a core structure of a multi-flow heat exchanger. BACKGROUND

[0002] As shown in the conventional freon refrigerant heat exchanger shown in Figure 1 and Figure 2 , the principle is that the refrigerant exchanges heat with air or cooling liquid through flat tubes and heat dissipation belts to achieve the purpose of increasing or reducing the temperature of air or cooling liquid to meet the cooling or heating needs of the automobile.

[0003] However, with the intensification of global warming and ozone depletion, the replacement of traditional freon refrigerants is imminent. CO2 is a natural working medium with environmental friendly characteristics. In addition, due to its physical properties, CO2 can be used as a refrigerant for automobile air conditioning systems. CO2 refrigerant automobile air conditioning systems have the advantages of high working pressure and high heat exchange efficiency. CO2 heat exchanger is a heat exchanger device suitable for CO2 automobile air conditioning systems.

[0004] In actual application, as shown in the conventional freon heat exchanger shown in Figure 2 , multiple flat tubes are inserted into the collecting tube, and the multiple flat tubes share an internal space of the collecting tube. This structure has a large internal space of the collecting tube and poor pressure resistance, which cannot meet the high pressure resistance requirement of the CO2 air conditioning system. The length of the flat tube inserted into the collecting tube of the conventional freon heat exchanger will affect the flow of the refrigerant. When the refrigerant flow rate is high, it will cause large flow resistance of the refrigerant in the collecting tube, affecting the heat exchange effect.

[0005] Therefore, how to make the heat exchanger more compact in space, improve the pressure resistance of the heat exchanger, reduce the flow resistance of the refrigerant in the collecting tube, improve the flow speed of the refrigerant inside, and improve the heat exchange effect have become technical problems that need to be solved by those skilled in the art. SUMMARY

[0006] In view of the problems of the prior art, such as uncompact structure, poor pressure resistance, large flow resistance in the collecting tube, slow flow speed of the refrigerant, and low heat exchange efficiency, the present application provides a cooling liquid flow channel structure of a multi-flow heat exchanger.

[0007] To achieve the above object, the application discloses a core structure of a multi-flow heat exchanger, comprising a flow distribution component provided with a refrigerant input port and a refrigerant output port on one side, and a flow guide component, wherein the flow distribution component and the flow guide component are both provided in a plate type integrated manner; a plurality of flow groups are provided between the other side of the flow distribution component and the flow guide component, and the flow groups are arranged in parallel and in an even number of rows and / or columns, wherein the flow group comprises a plurality of heat dissipation flat tubes for flowing refrigerant, and corresponding heat dissipation bands; the plurality of flow groups comprise a first flow group for connecting the refrigerant input port, and a tail flow group for connecting the refrigerant output port;

[0008] The flow distribution component is provided with an input / output flow channel connected with the refrigerant input port and the refrigerant output port at positions corresponding to the first flow group and the tail flow group.

[0009] The flow distribution component or the flow guide component is provided with an inter-column communication flow channel and / or an inter-row communication flow channel.

[0010] Each inter-column communication flow channel covers at least two flow groups in the same row.

[0011] Each inter-row communication flow channel covers at least two flow groups in the same column.

[0012] The plurality of flow groups form a refrigerant passage from the first flow group to the tail flow group through the flow channels in the flow distribution component and the flow guide component.

[0013] The application simplifies the traditional pipe connection by arranging the flow distribution component and the flow guide component in a plate type integrated manner, arranging the intercommunication flow channels in the flow distribution component and the flow guide component to form the refrigerant passage, and making the heat exchanger more compact in space. The heat dissipation flat tubes in the flow group improve the pressure resistance and the flow speed of the internal refrigerant, and improve the heat exchange effect.

[0014] Preferably, the plurality of flow groups are arranged in two columns and at least three rows, and the two flow groups in the first row are the first flow group and the tail flow group.

[0015] The flow distribution component is provided with an inter-column communication flow channel between the two flow groups in the last row, and the flow distribution component and the flow guide component are alternately and spacedly provided with an inter-row communication flow channel between the two adjacent flow groups in each column.

[0016] Preferably, the number of the flow groups is four, and the four flow groups are arranged in two rows and two columns, and the two flow groups in the first row are the first flow group and the tail flow group.

[0017] The flow distribution assembly is provided with an inter-column communication flow channel between the two flow communication groups corresponding to the second row, and the flow guide assembly is provided with an inter-row communication flow channel between the two flow communication groups corresponding to the first column and between the two flow communication groups corresponding to the second column.

[0018] Preferably, each of the inter-row communication flow channels comprises an interface connected with each of the corresponding heat dissipation flat tubes, and a plurality of inter-row communication channels intersecting with each of the corresponding interfaces, and the plurality of heat dissipation flat tubes of the two corresponding flow communication groups are communicated through the plurality of inter-row communication channels.

[0019] Preferably, the flow distribution assembly is provided with a distribution plate between the refrigerant input port and the refrigerant output port.

[0020] The distribution plate is provided with a distribution hole corresponding to each of the input / output flow channels in the range of the refrigerant input port and the refrigerant output port.

[0021] Preferably, the flow distribution assembly comprises an end plate flow communication plate.

[0022] The end plate flow communication plate is provided with a plurality of long holes penetrating both sides to form the corresponding input / output flow channels, inter-column communication flow channels and / or inter-row communication flow channels.

[0023] Preferably, the flow guide assembly comprises a bottom flow communication plate.

[0024] The bottom flow communication plate is provided with a plurality of grooves to form the corresponding inter-column communication flow channels and / or inter-row communication flow channels.

[0025] More preferably, the opposite side of the flow distribution assembly and the flow guide assembly from the inside to the outside comprises a main bearing plate and a flat tube spacing plate in sequence.

[0026] The main bearing plate and the flat tube spacing plate are provided with mounting holes corresponding to each of the heat dissipation flat tubes.

[0027] The mounting holes in the main bearing plate are sealingly connected with each of the heat dissipation flat tubes for bearing external and internal loads.

[0028] The mounting holes in the flat tube spacing plate form a flow space for refrigerant to constrain the spacing between each two heat dissipation flat tubes.

[0029] More preferably, the conditions are satisfied: W4≥W3>W2≥W1; and / or,

[0030] 0≤W2-W1≤0.3mm; and / or,

[0031] W3-W1≥0.3mm; and / or,

[0032] 0≤W4-W3≤4mm;

[0033] Wherein, W1 is the width of each of the heat dissipation flat tubes, W2 is the width of the mounting hole in the main support plate, W3 is the width of the mounting hole in the flat tube spacing plate, and W4 is the width of the elongated hole in the end plate flow plate and / or the groove in the bottom flow plate.

[0034] More preferably, the condition H2 ≥ H4 ≥ 0.2 * H2 is satisfied;

[0035] Wherein, H2 is the thickness of the flat tube spacing plate, and H4 is the depth to which the heat dissipation flat tube is inserted into the flat tube spacing plate.

[0036] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0037] Figure 1 A schematic diagram of the existing technology is shown.

[0038] Figure 2 This diagram shows a partially enlarged view of a conventional exchanger where multiple flat tubes are inserted into a collection tube.

[0039] Figure 3 A schematic diagram of the exploded structure according to an embodiment of the present invention is shown.

[0040] Figure 4 An exploded view showing both the diversion component and the guide component in one embodiment of the present invention.

[0041] Figure 5 This diagram illustrates the refrigerant flow state in a flow group arranged in two columns and two rows according to an embodiment of the present invention.

[0042] Figure 6 A schematic diagram of the longitudinal section structure of an embodiment of the present invention is shown.

[0043] Figure 7 This invention is shown Figure 6 A magnified view of a portion of point A in the middle.

[0044] Figure 8 This invention is shown Figure 6 A magnified view of a portion of point B in the middle.

[0045] Figure 9 A schematic diagram of the end plate flow plate in one embodiment of the present invention is shown.

[0046] Figure 10 A schematic diagram of the bottom flow plate is shown in one embodiment of the present invention.

[0047] Figure 11 This is a schematic diagram of the bottom flow plate from another perspective in one embodiment of the present invention.

[0048] In the picture:

[0049] 1. Refrigerant inlet; 2. Refrigerant outlet; 3. Flow divider assembly; 4. Flow guide assembly; 5. Heat dissipation flat tube; 6. Input and output flow channels; 7. Inter-row connecting flow channel; 8. Inter-row connecting flow channel; 9. Interface; 10. Inter-row connecting channel; 11. Distribution hole; 12. End plate flow plate; 13. Distribution plate; 14. Bottom flow plate; 15. Main support plate; 16. Flat tube spacing plate. Detailed Implementation

[0050] like Figures 3 to 6 As shown, the core structure of the multi-pass heat exchanger includes a flow-dividing component 3 with a refrigerant inlet 1 and a refrigerant outlet 2 on one side, and a flow-guiding component 4. Both the flow-dividing component 3 and the flow-guiding component 4 are integrated in a plate-like manner. On the other side of the flow-dividing component 3 and between the flow-guiding component 4, there are multiple parallel flow groups arranged in an even number of rows and / or columns. Each flow group includes multiple heat dissipation flat tubes 5 for circulating refrigerant, and corresponding heat dissipation strips. The multiple flow groups include a first flow group for connecting to the refrigerant inlet 1 and a tail flow group for connecting to the refrigerant outlet 2.

[0051] The flow distribution assembly 3 is provided with input and output channels 6 at the first flow group and the tail flow group, respectively, which are connected to the refrigerant inlet 1 and the refrigerant outlet 2.

[0052] The flow distribution component 3 or the flow guiding component 4 is provided with an inter-column communication channel 7 and / or an inter-row communication channel 8.

[0053] Each inter-column interconnection channel 7 covers at least two flow groups located in the same row;

[0054] Each inter-row connecting channel 8 covers at least two flow groups located in the same column;

[0055] Multiple flow groups form a refrigerant passage from the first flow group to the last flow group through the flow channels in the flow distribution component 3 and the flow guiding component 4.

[0056] This invention integrates the flow distribution component and the flow guiding component into a plate-like configuration, and sets up connecting channels in the flow distribution component and the flow guiding component to form a refrigerant passage, which simplifies the traditional pipe connection and makes the heat exchanger more compact in space. By designing the flow unit in the flow group as a heat dissipation flat tube, the pressure burst resistance is improved, the internal refrigerant flow resistance is reduced, the internal refrigerant flow velocity is increased, and the heat exchange effect is improved.

[0057] In some embodiments, the plurality of flow groups are arranged in two columns and at least three rows, and the two flow groups in the first row are a first flow group and a last flow group, respectively.

[0058] The flow distribution assembly 3 is provided with a column-to-column communication flow channel 7 between the two flow groups in the last row, and the flow distribution assembly 3 and the flow guide assembly 4 are alternately and spacedly provided with a row-to-row communication flow channel 8 between the two adjacent flow groups in each column.

[0059] In some embodiments, the number of flow groups is four, and the four flow groups are arranged in two rows and two columns, and the two flow groups in the first row are a first flow group and a last flow group, respectively.

[0060] The flow distribution assembly 3 is provided with a column-to-column communication flow channel 7 between the two flow groups in the second row, and the flow guide assembly 4 is provided with a row-to-row communication flow channel 8 between the two flow groups in the first column and between the two flow groups in the second column.

[0061] As shown in FIG. 1, in some embodiments, the core structure including four flow groups in two columns and two rows is taken as an example to illustrate the flow process of the refrigerant: Figure 5

[0062] Process 1: The refrigerant enters a flow group in the first column through the refrigerant input port 1 of the flange, exchanges heat with the external medium through the heat dissipation flat tube 5 and the corresponding heat dissipation belt, enters another flow group in the same column through the flow guide assembly 4, and completes the first process.

[0063] Process 2: The refrigerant flows downward to another flow group in the same column through the row-to-row communication flow channel 8 of the flow guide assembly 4 corresponding to the first column, exchanges heat with the external medium through the heat dissipation flat tube 5 and the corresponding heat dissipation belt, and then flows through the column-to-column communication flow channel 7 of the flow distribution assembly 3, and completes the second process.

[0064] Process 3: The refrigerant flows horizontally through the column-to-column communication flow channel 7 of the flow distribution assembly 3, enters the last flow group in another column, exchanges heat with the external medium through the heat dissipation flat tube 5 and the corresponding heat dissipation belt, enters the flow guide assembly 4, and completes the third process.

[0065] Process 4: The refrigerant flows upward to a flow group in another column through the row-to-row communication flow channel 8 of the flow guide assembly 4 corresponding to another column, exchanges heat with the external medium through the heat dissipation flat tube 5 and the corresponding heat dissipation belt, and then enters the flow distribution assembly 3, and the refrigerant output port 2 flows out, and the fourth process is completed.

[0066] This four-process arrangement is more compact in space, and the four-process arrangement can improve the flow speed of the internal refrigerant and improve the heat exchange effect.

[0067] As shown in FIG. 1, in some embodiments, the core structure including four flow groups in two columns and two rows is taken as an example to illustrate the flow process of the refrigerant:​Figure 10 and Figure 11 As shown in

[0068] As shown in Figure 3 , Figure 4 and Figure 5 In some embodiments, the shunt assembly 3 is provided with a distribution plate 13 between the refrigerant input port 1 and the refrigerant output port 2.

[0069] The distribution plate 13 is provided with a distribution hole 11 corresponding to each input / output flow channel 6 in the range of the refrigerant input port 1 and the refrigerant output port 2.

[0070] In actual application, the distribution plate 13 can realize accurate distribution of refrigerant, improve the uniformity of refrigerant distribution, and improve the heat exchange effect on the refrigerant side.

[0071] As shown in Figure 7 and Figure 9 In some embodiments, the shunt assembly 3 includes an end plate flow-through plate 12.

[0072] The end plate flow-through plate 12 is provided with a plurality of long holes penetrating both sides to form corresponding input / output flow channels 6, column intercommunication flow channels 7 and / or row intercommunication flow channels 8.

[0073] As shown in Figure 8 , Figure 10 and Figure 11 The flow guide assembly 4 includes a bottom flow-through plate 14.

[0074] The bottom flow-through plate 14 is provided with a plurality of grooves to form corresponding column intercommunication flow channels 7 and / or row intercommunication flow channels 8.

[0075] As shown in Figure 4 , Figure 7 and Figure 8 In some embodiments, the shunt assembly 3 and the flow guide assembly 4 are provided with a main bearing plate 15 and a flat tube spacing plate 16 from inside to outside on one side facing each other.

[0076] The main bearing plate 15 and the flat tube spacing plate 16 are provided with mounting holes corresponding to each heat dissipation flat tube 5.

[0077] The mounting holes in the main bearing plate 15 are sealingly connected with each heat dissipation flat tube 5 for bearing external and internal loads.

[0078] The mounting hole in the flat tube spacing plate 16 forms a flow space of refrigerant for restricting the spacing between every two heat dissipation flat tubes 5.

[0079] As shown in Figure 7 and Figure 8 In some embodiments, the dimensions of each part satisfy the condition formula: W4≥W3>W2≥W1; and / or,

[0080] 0≤W2-W1≤0.3mm; and / or,

[0081] W3-W1≥0.3mm; and / or,

[0082] 0≤W4-W3≤4mm;

[0083] Wherein, W1 is the width of each heat dissipation flat tube 5, W2 is the width of the mounting hole in the main bearing plate 15, W3 is the width of the mounting hole in the flat tube spacing plate 16, and W4 is the width of the long hole in the end plate flow plate 12 and / or the width of the groove in the bottom flow plate 14.

[0084] In practical applications, the size definitions and requirements are as follows:

[0085] Implementation effect: The width size requirements of each hole as above can ensure the smooth assembly process of the parts and the effective welding of the brazing process, while reducing the flow resistance of the refrigerant and improving the heat exchange effect;

[0086] 0≤W2-W1≤0.3mm can ensure the smooth assembly process of the heat dissipation flat tube 5 and the main bearing plate 15, and at the same time realize the effective welding of the heat dissipation flat tube 5 and the main bearing plate 15. Specifically, W2-W1 can be (mm): 0, 0.1, 0.2, 0.3, etc.

[0087] W3-W1≥0.3mm can ensure that the heat dissipation flat tube 5 is inserted into the part of the flat tube spacing plate 16, and the gap between the heat dissipation flat tube 5 and the flat tube spacing plate 16 on both sides is above 0.3mm, so that the solder will not block the flat tube hole. Specifically, W3-W1 can be (mm): 0.3, 0.4, 0.5, 0.6, etc.

[0088] 0≤W4-W3≤4mm can reduce the flow resistance when the refrigerant flows between the flat tube spacing plate 16 and the flow plate. Specifically, W4-W3 can be (mm): 0, 1, 2, 3, 4, etc.

[0089] W4≥W3>W2≥W1, in the process of refrigerant inflow, along the direction of refrigerant flow, the width of the hole decreases; in the process of refrigerant outflow, along the direction of refrigerant flow, the width of the hole increases; in this way, the flow resistance of the refrigerant can be effectively reduced and the heat exchange effect can be improved.

[0090] As shown inFigure 7 and Figure 8 As shown in the formula, in some embodiments, the dimensions of each part satisfy the condition: H2≥H4≥0.2*H2.

[0091] Wherein, H2 is the thickness of the flat tube spacing plate 16, and H4 is the depth of the heat dissipation flat tube 5 inserted into the flat tube spacing plate 16.

[0092] In practical applications, the size definitions and requirements are as follows:

[0093] Implementation effect: As the above material thickness requirement and depth requirement, the brazing effectiveness during the welding process of the part can be ensured, and the product has higher pressure resistance performance.

[0094] H2≥H4≥0.2*H2, during the assembly process, the depth of the heat dissipation flat tube 5 inserted into the flat tube spacing plate 16 is more than 0.2 times the distance plate wall thickness,

[0095] to ensure that the solder does not block the flat tube hole during brazing, so as to avoid affecting the heat exchange effect; the depth of the flat tube inserted into the distance plate is less than or equal to the distance plate wall thickness, that is, the insertion depth of the flat tube cannot exceed the distance plate. In other embodiments, the depth of the heat dissipation flat tube 5 inserted into the flat tube spacing plate 16 can also be more than 0.3, 0.4 times, etc. the distance plate wall thickness.

[0096] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. The core structure of a multi-pass heat exchanger, characterized in that: The device includes a flow-dividing assembly (3) with a refrigerant inlet (1) and a refrigerant outlet (2) on one side, and a flow-guiding assembly (4). The flow-dividing assembly (3) and the flow-guiding assembly (4) are both integrated in a plate-like manner. On the other side of the flow-dividing assembly (3) and between the flow-guiding assembly (4), there are multiple parallel flow groups arranged in an even number of rows and / or columns. Each flow group includes multiple heat dissipation flat tubes (5) for circulating refrigerant, and corresponding heat dissipation strips. Each flow group includes a first flow group for connecting the refrigerant inlet (1) and a tail flow group for connecting the refrigerant outlet (2). The diversion component (3) is provided with input and output channels (6) that are connected to the refrigerant inlet (1) and the refrigerant outlet (2) respectively at the first flow group and the tail flow group. The flow distribution component (3) or the flow guiding component (4) is provided with non-overlapping inter-column connecting channels (7) and / or inter-row connecting channels (8). Each of the inter-column connectivity channels (7) covers at least two of the flow groups located in the same row; Each of the inter-row connecting channels (8) covers at least two of the flow groups located in the same column; Multiple flow groups form a refrigerant passage from the first flow group to the last flow group through the flow channels in the flow splitting component (3) and the flow guiding component (4).

2. The core structure of the multi-pass heat exchanger according to claim 1, characterized in that, The multiple flow groups are arranged in two columns and at least three rows, with the two flow groups in the first row being the first flow group and the last flow group, respectively. The diversion component (3) has an inter-column connecting channel (7) between the two flow groups corresponding to the last row, and the diversion component (3) and the flow guiding component (4) have an inter-row connecting channel (8) alternately spaced between the two adjacent flow groups of each column.

3. The core structure of the multi-pass heat exchanger according to claim 1, characterized in that, The number of circulation groups is four, and the four circulation groups are arranged in two rows and two columns. The two circulation groups in the first row are the first circulation group and the last circulation group, respectively. The diversion component (3) has an inter-column connecting channel (7) between the two flow groups in the second row, and the flow guiding component (4) has an inter-row connecting channel (8) between the two flow groups in the first column and between the two flow groups in the second column.

4. The core structure of the multi-pass heat exchanger according to claim 1, characterized in that, Each of the inter-row connecting channels (8) includes an interface (9) connected to each of the corresponding heat dissipation flat tubes (5), and multiple inter-row communication channels (10) that intersect with the corresponding interface (9), thereby connecting the multiple heat dissipation flat tubes (5) of the corresponding two flow groups through the multiple inter-row communication channels (10).

5. The core structure of the multi-pass heat exchanger according to claim 1, characterized in that, A distribution plate (13) is provided between the flow splitting component (3) and the refrigerant inlet (1) and the refrigerant outlet (2). The distribution plate (13) is provided with a distribution hole (11) corresponding to each of the multiple input and output channels (6) in the range of the refrigerant inlet (1) and the range of the refrigerant outlet (2).

6. The core structure of the multi-pass heat exchanger according to claim 1, characterized in that, The diversion component (3) includes an end plate flow plate (12); The end plate flow plate (12) is provided with a plurality of elongated holes that penetrate both sides to form the corresponding input and output flow channels (6), the inter-column flow channels (7) and / or the inter-row flow channels (8).

7. The core structure of the multi-pass heat exchanger according to claim 6, characterized in that, The flow guiding component (4) includes a bottom flow plate (14); The bottom flow plate (14) is provided with multiple grooves to form the corresponding inter-column connecting channels (7) and / or inter-row connecting channels (8).

8. The core structure of the multi-pass heat exchanger according to claim 7, characterized in that, The opposing sides of the diversion component (3) and the guide component (4) include, from the inside out, a main bearing plate (15) and a flat tube spacing plate (16). The main support plate (15) and the flat tube spacing plate (16) are provided with mounting holes for each of the heat dissipation flat tubes (5); The mounting holes in the main bearing plate (15) are sealed to each of the heat dissipation flat tubes (5) for bearing external and internal loads; The mounting holes in the flat tube spacing plate (16) form a refrigerant flow space to constrain the spacing between every two heat dissipation flat tubes (5).

9. The core structure of the multi-pass heat exchanger according to claim 8, characterized in that, The following conditions must be met: W4 ≥ W3 > W2 ≥ W1; and / or, 0 ≤ W2 - W1 ≤ 0.3 mm; and / or, W3-W1≥0.3mm; and / or, 0≤W4-W3≤4mm; Wherein, W1 is the width of each of the heat dissipation flat tubes (5), W2 is the width of the mounting hole in the main support plate (15), W3 is the width of the mounting hole in the flat tube spacing plate (16), and W4 is the width of the elongated hole in the end plate flow plate (12) and / or the groove in the bottom flow plate (14).

10. The core structure of the multi-pass heat exchanger according to claim 8, characterized in that, The condition is satisfied: H2 ≥ H4 ≥ 0.2 * H2; Wherein, H2 is the thickness of the flat tube spacing plate (16), and H4 is the depth to which the heat dissipation flat tube (5) is inserted into the flat tube spacing plate (16).

Images