Micro-channel heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a micro-channel heat exchanger which comprises a first collecting pipe, a second collecting pipe and a plurality of flat pipes, the flat pipes are arranged between the first collecting pipe and the second collecting pipe, and the two ends of each flat pipe penetrate through and are connected with the adjacent sides of the first collecting pipe and the second collecting pipe in an interference fit mode respectively. The flat pipes are of a structure that a plurality of S shapes are connected end to end, a plurality of air holes are formed in the flat pipes, and a fin set is fixedly connected between every two flat pipes. According to the utility model, the plurality of S-shaped flat tubes which are connected end to end are adopted, so that the paths of refrigerants in the flat tubes at the same transverse distance can be increased, the heat exchange service time of the refrigerants is prolonged, the heat exchange effect is improved, and the vertical fins can exchange heat between airflow passing through the air holes and the refrigerants in the flat tubes, so that the heat exchange efficiency is improved. The transverse fins can ensure that air flow passing through the gap between the two air holes can exchange heat, and the heat exchange effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a microchannel heat exchanger. Background Technique

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers are classified according to the heat transfer principle into direct contact heat exchangers, compound heat exchangers, etc., and according to the structure into floating head heat exchangers, fixed tube sheet heat exchangers, U-tube sheet heat exchangers, plate heat exchangers, etc.; a microchannel heat exchanger is a type of heat exchanger, which is a heat exchanger with an equivalent diameter of the channel in the range of 10 - 1000 μm. There are dozens of fine channels in the flat tube of this heat exchanger, and the two ends of the flat tube are connected to circular headers.

[0003] In the patent document with the published publication number CN219869238U, a microchannel heat exchanger is disclosed. The tooth-shaped microchannel cross-section of the heat exchanger in this published patent document is tooth-shaped, which increases the contact area between the refrigerant and the flat tube. At the same time, the adjacent surfaces of adjacent tooth-shaped microchannels are complementary in shape, realizing that on the premise of ensuring the structural strength, more tooth-shaped microchannels can be opened in the same flat tube, further increasing the heat exchange area and improving the heat exchange efficiency; however, in the above-mentioned published patent document, the flat tube (flat pipe) adopts a horizontal pipe form, and the path of the refrigerant inside the flat tube is short at the same horizontal distance, the heat exchange use time of the refrigerant is short, and the heat exchange effect is poor. Content of the Utility Model

[0004] The purpose of the utility model is to provide a microchannel heat exchanger to solve the problems raised in the background technique.

[0005] The embodiment of the present application provides a microchannel heat exchanger, including header one, header two and a plurality of flat tubes. The plurality of flat tubes are arranged between header one and header two, and the two ends of the flat tubes respectively penetrate and are in interference fit connection with the adjacent sides of header one and header two. The flat tubes are in a structure where a plurality of "S" shapes are connected end to end, and a plurality of air holes are formed on the flat tubes. A fin group is fixedly connected between every two flat tubes. The fin group is integrally formed by casting a plurality of vertical fins and a plurality of horizontal fins. The vertical fins are inside the air holes, and each horizontal fin is between two adjacent vertical fins.

[0006] By adopting the above technical solution, the path of the refrigerant inside the flat tube at the same horizontal distance can be increased, the heat exchange use time of the refrigerant can be increased, and the vertical fins can exchange heat between the air flow passing through the air holes and the refrigerant in the flat tube, and the horizontal fins can ensure that the air flow passing through the gap between two air holes can also exchange heat.

[0007] Optionally, flat holes are provided on the flat tubes. A stopper is fixedly connected to the middle of the first header. The stopper divides the interior of the first header into a first chamber and a second chamber. The upper flat tube communicates with the first chamber, and the lower flat tube communicates with the second chamber.

[0008] By adopting the above technical solution, the design of the flat holes can increase the contact area between the refrigerant and the flat tubes under the same volume, and enable the refrigerant to realize the reciprocating flow path of the first chamber, the second header and the second chamber, so that the refrigerant in a single trip can be utilized twice.

[0009] Optionally, two sets of reinforcement components are provided between the first header and the second header. Each set of reinforcement components includes a reinforcement rod, two first semi-circular rings and two second semi-circular rings. The two first semi-circular rings are respectively fixedly connected to both ends of the reinforcement rod. The second semi-circular ring and the first semi-circular ring form a circular hole that is adapted to both the first header and the second header. Ear parts one are fixedly connected to the front and rear sides of the first semi-circular ring, and ear parts two are fixedly connected to the front and rear sides of the second semi-circular ring. Bolts are passed through and threadedly connected to the ear parts one and the ear parts two.

[0010] By adopting the above technical solution, the first header and the second header are passed through the circular hole formed by the second semi-circular ring and the first semi-circular ring, and then the bolts are rotated for connection and fixation, which increases the lateral anti-extrusion ability of the microchannel heat exchanger.

[0011] Optionally, a liquid inlet pipe is communicated with the interior of the first chamber, and a liquid discharge pipe is communicated with the interior of the second chamber. The liquid inlet pipe is pipe-connected to the output end of the refrigerator, and the liquid discharge pipe is pipe-connected to the input end of the refrigerator.

[0012] By adopting the above technical solution, the refrigerator can be connected to the microchannel heat exchanger so that the refrigerant can circulate.

[0013] Optionally, a first one-way valve is provided on the liquid inlet pipe, and a second one-way valve is provided on the liquid discharge pipe. The direction of fluid flow of the first one-way valve is from left to right, and the direction of fluid flow of the second one-way valve is from right to left.

[0014] By adopting the above technical solution, the phenomenon of refrigerant backflow is prevented.

[0015] Optionally, matching pipe caps one are threadedly connected to the top and bottom of the first header, and matching pipe caps two are threadedly connected to the top and bottom of the second header.

[0016] By adopting the above technical solution, it is convenient to open the first header and the second header for maintenance.

[0017] Optionally, sealing rings are provided between the pipe cap one and the first header and between the pipe cap two and the second header.

[0018] By adopting the above technical solution, the sealing performance when the first pipe cap and the second pipe cap are closed is enhanced.

[0019] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0020] 1. By adopting flat tubes with a structure where multiple "S" shapes are connected end to end, the path of the refrigerant inside the flat tubes at the same lateral distance can be increased, the heat exchange time of the refrigerant can be prolonged, thereby enhancing the heat exchange effect. Moreover, the vertical fins can exchange heat between the air flow passing through the air holes and the refrigerant inside the flat tubes, and the horizontal fins can ensure that the air flow passing through the gap between two air holes can also exchange heat, resulting in a good heat exchange effect.

[0021] 2. Through the design of flat holes, the contact area between the refrigerant and the flat tubes under the same volume can be increased, improving the utilization rate of the refrigerant. Additionally, it enables the refrigerant to achieve a reciprocating flow path among the first chamber, the second header, and the second chamber, allowing the refrigerant in a single pass to be utilized twice, further enhancing the utilization rate of the refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objectives, and advantages of the present utility model will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 It is a schematic structural diagram of the present utility model;

[0024] Figure 2 It is a partial structural diagram of two flat tubes and a fin group of the present utility model;

[0025] Figure 3 It is a front sectional view of the first header of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of a set of reinforcement components of the present utility model;

[0027] Figure 5 For the present utility model Figure 4 An enlarged view of A.

[0028] In the figure: 1. First header; 2. Second header; 3. Flat tube; 4. Fin group; 5. Reinforcement rod; 6. Liquid inlet pipe; 7. Liquid discharge pipe; 8. First check valve; 9. Second check valve; 10. First pipe cap; 11. Second pipe cap; 12. Flat hole; 13. Air hole; 14. Vertical fin; 15. Horizontal fin; 16. Block; 17. First chamber; 18. Second chamber; 19. First semi-circular ring; 20. Second semi-circular ring; 21. First ear piece; 22. Second ear piece; 23. Bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0030] Please refer to Figure 1-2 , the present utility model provides a technical solution: including header one 1, header two 2 and a plurality of flat tubes 3. The plurality of flat tubes 3 are arranged between header one 1 and header two 2, and both ends of the flat tubes 3 respectively penetrate and are in interference fit connection with the adjacent sides of header one 1 and header two 2. The flat tubes 3 are in a structure where a plurality of "S" - shaped figures are connected end to end, and a plurality of air holes 13 are formed on the flat tubes 3. A fin group 4 is fixedly connected between every two flat tubes 3. The fin group 4 is integrally formed by casting a plurality of vertical fins 14 and a plurality of horizontal fins 15. The vertical fins 14 are inside the air holes 13, and each horizontal fin 15 is between two adjacent vertical fins 14;

[0031] In this technical solution, by adopting the flat tubes 3 with a structure where a plurality of "S" - shaped figures are connected end to end, the path of the refrigerant inside the flat tubes 3 at the same horizontal distance can be increased, the heat exchange time of the refrigerant can be increased, thereby increasing the heat exchange effect. Moreover, the vertical fins 14 can exchange heat between the air flow passing through the air holes 13 and the refrigerant inside the flat tubes 3, and the horizontal fins 15 can ensure that the air flow passing through the gap between two air holes 13 can also exchange heat, with good heat exchange effect.

[0032] In some technical solutions, as Figure 1-3 shown, flat holes 12 are opened on the flat tubes 3. A block 16 is fixedly connected to the middle of header one 1. The block 16 divides the interior of header one 1 into chamber one 17 and chamber two 18. The upper flat tubes 3 are communicated with chamber one 17, and the lower flat tubes 3 are communicated with chamber two 18.

[0033] During use, the design of the flat holes 12 can increase the contact area between the refrigerant and the flat tubes 3 under the same volume, increase the utilization rate of the refrigerant, and enable the refrigerant to realize the reciprocating flow path among chamber one 17, header two 2 and chamber two 18, so that the single - trip refrigerant can be utilized twice, further increasing the utilization rate of the refrigerant.

[0034] In some technical solutions, as Figure 1 , Figure 4 and Figure 5As shown in the figure, there are two sets of reinforcement components arranged between header one 1 and header two 2. Each set of reinforcement components includes a reinforcement rod 5, two semi-circular rings one 19 and two semi-circular rings two 20. The two semi-circular rings one 19 are respectively fixedly connected to both ends of the reinforcement rod 5. The semi-circular ring two 20 and the semi-circular ring one 19 form a circular hole that is adapted to both header one 1 and header two 2. On the front and back sides of the semi-circular ring one 19, there are respectively fixedly connected ear pieces one 21. On the front and back sides of the semi-circular ring two 20, there are respectively fixedly connected ear pieces two 22. A bolt 23 passes through and is threadedly connected to the ear piece one 21 and the ear piece two 22.

[0035] During use, by passing header one 1 and header two 2 through the circular hole formed by the semi-circular ring two 20 and the semi-circular ring one 19, and then rotating the bolt 23 to connect and fix the ear piece one 21 and the ear piece two 22, the reinforcement components can be fixed between header one 1 and header two 2, increasing the lateral anti-extrusion ability of this microchannel heat exchanger.

[0036] In some technical solutions, such as Figure 1 and Figure 3 As shown in the figure, a liquid inlet pipe 6 is internally connected to chamber one 17, and a liquid discharge pipe 7 is internally connected to chamber two 18. The liquid inlet pipe 6 is pipe-connected to the output end of the refrigerator, and the liquid discharge pipe 7 is pipe-connected to the input end of the refrigerator.

[0037] During use, the refrigerator can be connected to this microchannel heat exchanger through the liquid inlet pipe 6 and the liquid discharge pipe 7 so that the refrigerant can circulate.

[0038] In some technical solutions, such as Figure 1 As shown in the figure, a check valve one 8 is arranged on the liquid inlet pipe 6, and a check valve two 9 is arranged on the liquid discharge pipe 7. The direction of fluid flow of the check valve one 8 is from left to right, and the direction of fluid flow of the check valve two 9 is from right to left.

[0039] During use, the check valve one 8 and the check valve two 9 are used to prevent the refrigerant from flowing back.

[0040] In some technical solutions, such as Figure 1 and Figure 3 As shown in the figure, pipe caps one 10 that match each other are threadedly connected to the top and bottom of header one 1, and pipe caps two 11 that match each other are threadedly connected to the top and bottom of header two 2.

[0041] During use, the pipe caps one 10 and the pipe caps two 11 facilitate the opening of header one 1 and header two 2 for maintenance and repair.

[0042] In some technical solutions, such as Figure 1 As shown in the figure, sealing rings are arranged between the pipe cap one 10 and header one 1 and between the pipe cap two 11 and header two 2.

[0043] During use, the sealing performance when the pipe cap one 10 and the pipe cap two 11 are closed is increased.

[0044] Working principle: During use, the refrigerant enters chamber 17 through the liquid inlet pipe 6, then enters header 2 through the upper flat tube 3, then enters chamber 18 through the lower flat tube 3, and finally is discharged through the liquid discharge pipe 7. During this process, the design of the flat holes 12 can increase the contact area between the refrigerant and the flat tube 3 under the same volume, increase the utilization rate of the refrigerant, and enable the refrigerant to achieve a reciprocating flow path in chamber 17, header 2, and chamber 18, so that a single trip of the refrigerant can be utilized twice. Moreover, by adopting the flat tube 3 with a structure in which multiple "S" shapes are connected end to end, the path of the refrigerant inside the flat tube 3 can be increased for the same horizontal distance. The vertical fins 14 can exchange heat between the air flow passing through the air holes 13 and the refrigerant in the flat tube 3, and the horizontal fins 15 can ensure that the air flow passing through the gap between the two air holes 13 can also exchange heat.

[0045] The above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microchannel heat exchanger, comprising a header first (1), a header second (2) and a plurality of flat tubes (3), characterized in that: A plurality of the flat tubes (3) are arranged between the first header (1) and the second header (2), and the two ends of the flat tubes (3) respectively penetrate and are connected to the adjacent sides of the first header (1) and the second header (2) by interference fit. The flat tubes (3) are in the form of a plurality of "S"-shaped end-to-end structures, and a plurality of air holes (13) are formed on the flat tubes (3). A fin group (4) is fixedly connected between every two of the flat tubes (3). The fin group (4) is integrally formed by casting a plurality of vertical fins (14) and a plurality of transverse fins (15). The vertical fins (14) are located inside the air holes (13), and each of the transverse fins (15) is located between two adjacent vertical fins (14).

2. The microchannel heat exchanger according to claim 1, characterized in that: A flat hole (12) is provided on the flat tube (3), and a stopper (16) is fixedly connected in the middle of the header pipe (1). The stopper (16) divides the interior of the header pipe (1) into chamber one (17) and chamber two (18). The upper flat tube (3) is connected to chamber one (17), and the lower flat tube (3) is connected to chamber two (18).

3. The microchannel heat exchanger according to claim 1, characterized in that: Two groups of reinforcement components are arranged between the first manifold (1) and the second manifold (2), each group of the reinforcement components comprises a reinforcement rod (5), two semicircular rings (19) and two semicircular rings (20), the two semicircular rings (19) are respectively fixedly connected to the two ends of the reinforcement rod (5), the semicircular rings (20) and the first manifold (19) form circular holes that are compatible with the first manifold (1) and the second manifold (2), the front and rear sides of the semicircular rings (19) are fixedly connected to the first ear piece (21), the front and rear sides of the semicircular rings (20) are fixedly connected to the second ear piece (22), and bolts (23) are passed through and threadedly connected to the first ear piece (21) and the second ear piece (22).

4. The microchannel heat exchanger according to claim 2, characterized in that: The interior of the chamber 1 (17) is connected to a liquid inlet pipe (6), and the interior of the chamber 2 (18) is connected to a liquid discharge pipe (7). The liquid inlet pipe (6) is connected to the output end of the refrigerator, and the liquid discharge pipe (7) is connected to the input end of the refrigerator.

5. The microchannel heat exchanger according to claim 4, characterized in that: The liquid inlet pipe (6) is provided with a one-way valve 1 (8), and the liquid discharge pipe (7) is provided with a one-way valve 2 (9). The direction of fluid flow of the one-way valve 1 (8) is from left to right, and the direction of fluid flow of the one-way valve 2 (9) is from right to left.

6. The microchannel heat exchanger according to claim 1, characterized in that: The top and bottom of the first manifold (1) are both threadedly connected with a matching pipe cover (10), and the top and bottom of the second manifold (2) are both threadedly connected with a matching pipe cover (11).

7. The microchannel heat exchanger according to claim 6, characterized in that: Sealing rings are provided between the pipe cover 1 (10) and the header pipe 1 (1) and between the pipe cover 2 (11) and the header pipe 2 (2).

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