Heat exchanger

Abstract

The utility model belongs to the technical field of heat exchange, and discloses a heat exchanger which comprises a first collecting pipe, a flow equalizing pipe, a second collecting pipe and a plurality of flat pipes, a partition plate in the first collecting pipe divides the interior of the first collecting pipe into a liquid inlet cavity and a liquid outlet cavity, the flow equalizing pipe is arranged in the liquid inlet cavity, the flow equalizing pipe is arranged in the extending direction of the first collecting pipe, and the flat pipes are arranged in the liquid inlet cavity. A plurality of liquid inlet holes and a plurality of liquid outlet holes are formed in the side wall of the flow equalizing pipe, and the liquid inlet holes and the liquid outlet holes are evenly distributed in the flow equalizing pipe. And the second collecting pipe and the first collecting pipe are arranged at an interval. The flat pipes are arranged at intervals and are communicated between the first collecting pipe and the second collecting pipe. The flow equalizing pipe can prolong the retention time of the refrigerant in the liquid inlet cavity, namely prolong the heat exchange participation time of the refrigerant, so that the refrigerant can exchange heat with the outside of the heat exchanger more sufficiently, the temperature difference between the inside and the outside of the heat exchanger is reduced, the surface frosting probability of the heat exchanger is reduced, and the heat exchange performance of the heat exchanger is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange technical field especially relates to a heat exchanger. BACKGROUND

[0002] With the development of automobile technology, the possession rate of electric vehicles in vehicles is higher and higher, and electric vehicle heat pump air conditioning technology is also more and more researched and applied, compared with the extra heat energy needed by ordinary air conditioner when the engine works, the heat pump air conditioner is more suitable for electric vehicles with less engine heat. And the heat exchanger as a key component in the air conditioning system, its technology promotion is very important.

[0003] When the heat exchanger runs in the air with low temperature, such as air source heat pump in winter heating operation, the fin surface temperature is lower than 0 DEG C, and the water vapor in the air is easy to frost on the fin surface, and the frost continues to proceed with the operation of the heat exchanger. After a period of time, the fin surface forms a thick ice layer. Ice layer not only causes the heat transfer performance of heat exchanger to decline, but also increases the resistance of air passing through the heat exchanger, which leads to the decrease of heat exchanger efficiency. The ice layer must be treated to eliminate its harm.

[0004] Therefore, a heat exchanger is needed to solve the above problems. INVENTION CONTENTS

[0005] The utility model discloses a heat exchanger, which can improve the heat exchange efficiency of refrigerant, reduce the temperature difference between the inside and outside of the heat exchanger, reduce the frosting of the heat exchanger, and improve the performance of the heat exchanger.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] A heat exchanger is provided, comprising:

[0008] A first header pipe is provided with a partition plate inside, which divides the first header pipe into a liquid inlet cavity and a liquid outlet cavity;

[0009] A flow equalizing pipe is arranged in the liquid inlet cavity, and the flow equalizing pipe is arranged along the extension direction of the first header pipe. A plurality of liquid inlet holes and a plurality of liquid outlet holes are arranged on the side wall of the flow equalizing pipe, and the plurality of liquid inlet holes and the plurality of liquid outlet holes are uniformly distributed on the flow equalizing pipe;

[0010] A second header pipe is arranged at intervals with the first header pipe;

[0011] A plurality of flat tubes are arranged at intervals and connected between the first header pipe and the second header pipe.

[0012] As an alternative solution of the heat exchanger, the heat exchanger comprises two said flow equalizing pipes, and another said flow equalizing pipe is arranged in the liquid outlet cavity.

[0013] As an alternative solution of the heat exchanger, the heat exchanger further comprises a plurality of fin assembly groups, and the fin assembly groups are connected between two adjacent said flat tubes.

[0014] As an alternative solution of the heat exchanger, the fin assembly comprises a plurality of fin monomers connected in sequence, the fin monomer comprises a connecting portion and a plurality of blades, the connecting portion is connected between two adjacent said flat tubes, the plurality of blades are spaced apart and connected to the connecting portion at an angle, and a ventilation hole is arranged between two adjacent said blades on the connecting portion.

[0015] As an alternative solution of the heat exchanger, the angle between the blade and the connecting portion is 20°-40°.

[0016] As an alternative solution of the heat exchanger, the plurality of blades are symmetrically arranged on the connecting portion.

[0017] As an alternative solution of the heat exchanger, the heat exchanger further comprises a flow resistance structure arranged in the second flow collecting pipe, and the flow resistance structure comprises a flow resistance plate arranged at an angle with respect to the liquid flow direction in the second flow collecting pipe.

[0018] As an alternative solution of the heat exchanger, the flow resistance structure comprises a connecting piece and a plurality of said flow resistance plates, the plurality of flow resistance plates are arranged at intervals, and the connecting piece connects all said flow resistance plates.

[0019] As an alternative solution of the heat exchanger, a protective layer is arranged outside the flat tube.

[0020] As an alternative solution of the heat exchanger, a plurality of channels are arranged in the flat tube, and each said channel is communicated with the first flow collecting pipe and the second flow collecting pipe.

[0021] The beneficial effects of the utility model are as follows:

[0022] The utility model provides a kind of heat exchanger, and flow equalizing pipe is arranged in liquid inlet cavity, refrigerant enters liquid inlet cavity, enters flow equalizing pipe by liquid inlet hole, after refrigerant fills flow equalizing pipe, it can flow out from the evenly distributed liquid outlet hole, and evenly flows into flat tube communicated with first flow collecting pipe, guarantee the uniformity of refrigerant flow in multiple flat tubes, reduce the temperature difference between multiple flat tubes, improve heat exchange performance. By flow equalizing pipe in liquid inlet cavity, refrigerant can be divided, the time that refrigerant stays in liquid inlet cavity is extended, i.e. the time that refrigerant participates heat exchange is extended, so that refrigerant is fully exchanged with heat exchanger outside, reduce the temperature difference between heat exchanger inside and outside, and then reduce the probability of frost on the surface of heat exchanger, improve the heat exchange performance of heat exchanger. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the heat exchanger provided by this utility model;

[0024] Figure 2 This is a schematic diagram of the inside of the first manifold of the heat exchanger provided by this utility model;

[0025] Figure 3 This is a schematic diagram of the interior of the second manifold of the heat exchanger provided by this utility model;

[0026] Figure 4 This is a schematic diagram of the fin assembly of the heat exchanger provided by this utility model;

[0027] Figure 5 yes Figure 4 Sectional view at AA.

[0028] In the picture:

[0029] 100. First manifold; 110. Baffle plate; 120. Liquid inlet chamber; 130. Liquid outlet chamber; 140. Liquid inlet; 150. Liquid outlet;

[0030] 200, flow equalization tube; 210, liquid inlet; 220, liquid outlet;

[0031] 300. Second manifold;

[0032] 400. Flat tube;

[0033] 500. Fin assembly; 510. Connector; 520. Blade;

[0034] 600. Flow-blocking structure; 610. Flow-blocking plate; 620. Connecting parts. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0038] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0039] As Figures 1 to 5 As shown in the figure, the heat exchanger of the embodiment includes a first header 100, a flow equalizing pipe 200, a second header 300 and a plurality of flat tubes 400, a partition 110 is arranged in the first header 100, the partition 110 divides the first header 100 into a liquid inlet cavity 120 and a liquid outlet cavity 130, on the first header 100, one end of the liquid inlet cavity 120 is provided with a liquid inlet 140, and one end of the liquid outlet cavity 130 is provided with a liquid outlet 150.The flow equalizing pipe 200 is arranged in the liquid inlet cavity 120, and the flow equalizing pipe 200 is arranged along the extension direction of the first header 100, a plurality of liquid inlet holes 210 and a plurality of liquid outlet holes 220 are arranged on the side wall of the flow equalizing pipe 200, and the plurality of liquid inlet holes 210 and the plurality of liquid outlet holes 220 are uniformly distributed on the flow equalizing pipe 200.The second header 300 is arranged at intervals with the first header 100.A plurality of flat tubes 400 are spaced apart and communicated between the first header 100 and the second header 300.

[0040] Based on the above design, the heat exchanger provided in the embodiment, by setting the flow equalizing pipe 200 in the liquid inlet cavity 120, so that the refrigerant enters the liquid inlet cavity 120 through the liquid inlet 140, enters the flow equalizing pipe 200 through the liquid inlet hole 210, and after the flow equalizing pipe 200 is filled with refrigerant, the refrigerant can flow out of the uniformly distributed liquid outlet hole 220 and flow into the flat tube 400 connected with the first header 100, ensuring the uniformity of the refrigerant flow in the plurality of flat tubes 400, reducing the temperature difference between the plurality of flat tubes, and improving the heat exchange performance of the heat exchanger. By controlling the flow in the liquid inlet cavity through the flow equalizing pipe 200, the time of the refrigerant staying in the liquid inlet cavity 120 can be prolonged, that is, the time of the refrigerant participating in heat exchange can be prolonged, so that the refrigerant can be more fully exchanged with the outside of the heat exchanger, the temperature difference between the inside and outside of the heat exchanger is reduced, thereby reducing the probability of frost on the surface of the heat exchanger, and improving the heat exchange performance of the heat exchanger.

[0041] It can be understood that in the embodiment, the first header 100 and the second header 300 are made of welded aluminum pipes or extruded seamless aluminum pipes, and the length of the first header 100 and the second header 300 can be adjusted according to actual conditions, which is beneficial to batch production of products. The surface of the first header 100 and the second header 300 is also provided with a composite material layer, which is beneficial to aluminum furnace brazing. Optionally, the thickness of the pipe wall of the first header 100 and the second header 300 is controlled to be 1.0mm-2.0mm, which can not only ensure the structural strength, but also has good corrosion resistance.

[0042] Optionally, the flat tube 400 is provided with a plurality of channels, each channel being communicated with the first header 100 and the second header 300, which can increase the flow of refrigerant in the flat tube 400 and improve the heat exchange effect of the flat tube 400.

[0043] It should be noted that the flat tube 400 is formed by a mold, and the process is mature and easy to produce. As a preferred embodiment, the width of the flat tube 400 is controlled to be 12mm-30mm, and the thickness is controlled to be 1.2mm-1.8mm, which can not only ensure the structural strength of the flat tube 400, but also avoid excessive use of materials and waste production costs.

[0044] As a preferred embodiment, the flat tube 400 is provided with a protective layer, and the protective layer is a zinc layer of a corrosion-resistant material sprayed on the surface of the flat tube 400, which is used to improve the corrosion resistance of the flat tube 400 and prolong the service life of the heat exchanger.

[0045] Further, the heat exchanger further comprises a flow resistance structure 600, and the flow resistance structure 600 is arranged in the second header 300. The flow resistance structure 600 comprises a flow resistance plate 610, and the flow resistance plate 610 is arranged at an angle with respect to the liquid flow direction in the second header 300.

[0046] By setting the flow blocking plate 610, the flow of the refrigerant in the second header 300 is increased, the flow speed of the refrigerant is slowed down, the flow time of the refrigerant in the second header 300 is prolonged, the heat exchanger is fully heat-exchanged with the outside, the risk of frosting is further reduced, and the heat exchange efficiency of the refrigerant is improved. In addition, by installing flow blocking plates 610 of different sizes and shapes, the flow can be controlled to meet the flow blocking needs of heat exchangers of different space sizes and different heat exchange capacities. In addition, the flow blocking plate 610 can change the flow direction of the refrigerant, and by changing the angle of the flow blocking plate 610, the flow direction of the refrigerant in the second header 300 can be controlled, so that the refrigerant can uniformly flow to multiple flat tubes 400 when flowing back from the second header 300 to the flat tube 400, further ensuring the temperature uniformity of different flat tubes 400, reducing the temperature difference between different flat tubes 400, and improving the heat exchange efficiency.

[0047] Optionally, the flow blocking structure 600 includes a connecting piece 620 and a plurality of flow blocking plates 610, the plurality of flow blocking plates 610 are arranged at intervals, and the connecting piece 620 connects all the flow blocking plates 610, so that the plurality of flow blocking plates 610 form an integral structure, facilitating the installation of the flow blocking structure 600. In this embodiment, the connecting piece 620 is a connecting rod, which is arranged in the plurality of flow blocking plates 610, and has a simple structure and is easy to install.

[0048] Further, the heat exchanger includes two flow equalizing pipes 200, and the other flow equalizing pipe 200 is arranged in the liquid outlet cavity 130, so that the refrigerant flows into the liquid outlet cavity 130 from the flat tube 400, enters and fills the flow equalizing pipe 200 through the liquid inlet hole 210, and then flows out from the liquid outlet hole 220, and finally flows out of the heat exchanger from the liquid outlet 150, thereby prolonging the flow time of the refrigerant in the liquid outlet cavity 130 and further improving the heat dissipation effect of the heat exchanger.

[0049] In this embodiment, the plurality of liquid inlet holes 210 and the plurality of liquid outlet holes 220 are arranged in two rows and symmetrically arranged on the side wall of the flow equalizing pipe 200, which has a simple structure and is easy to produce. It can be understood that the shape, size and number of the liquid inlet hole 210 and the liquid outlet hole 220 can be adjusted according to actual use requirements, which will not be repeated here.

[0050] Optionally, the thickness of the wall of the flow equalizing pipe 200 is 0.3-0.5 mm, and exemplarily can be set to 0.3 mm, 0.4 mm, 0.5 mm, etc., that is, the internal volume size requirement of the flow equalizing pipe 200 can be guaranteed, and the overall structure of the flow equalizing pipe 200 has a certain strength.

[0051] Further, the heat exchanger further includes a plurality of fin assemblies 500, and the fin assembly 500 is connected between two adjacent flat tubes 400. The refrigerant transfers heat to the flat tube 400, and then to the fin assembly 500, which can increase the heat exchange area of the heat exchanger and improve the heat exchange efficiency.

[0052] Optionally, the fin assembly 500 comprises a plurality of fin units connected in sequence, that is, the fin assembly 500 is connected in S-shaped structure between two flat tubes 400, which meets the requirements of drainage of the heat exchanger in heat pump state, is easy to clean and decontaminate in later period, and meets the use requirements in harsh environment.

[0053] Specifically, the fin unit comprises a connecting portion 510 and a blade 520, the connecting portion 510 is connected between two adjacent flat tubes 400, and a plurality of blades 520 are spaced apart and connected to the connecting portion 510 at an angle, and a ventilation hole is arranged between two adjacent blades 520 on the connecting portion 510. By arranging the blade 520 and the ventilation hole, the flow direction of the wind in the wind field can be changed, the heat exchange effect of the air is improved, and thus the heat exchange effect of the heat exchanger is improved.

[0054] Optionally, the angle between the blade 520 and the connecting portion 510 is 20°-40°, and exemplarily, the angle between the blade 520 and the connecting portion 510 can be set to 20°, 25°, 30°, 40°, etc., which can ensure good ventilation effect and avoid reducing the structural strength due to too large angle.

[0055] In the embodiment, the ventilation hole and the blade 520 are formed at the same time by stamping the fin unit, which simplifies the production process and reduces the production cost. Optionally, a plurality of blades 520 are symmetrically arranged on the connecting portion 510, which increases the air flow channels in different directions and further improves the heat exchange efficiency.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement, etc. made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A heat exchanger, characterized in that, include: A first manifold (100) is provided with a partition (110) inside the first manifold (100), the partition (110) dividing the first manifold (100) into an inlet chamber (120) and an outlet chamber (130); A flow equalization tube (200) is disposed in the liquid inlet chamber (120). The flow equalization tube (200) is disposed along the extension direction of the first flow collector (100). A plurality of liquid inlet holes (210) and a plurality of liquid outlet holes (220) are disposed on the side wall of the flow equalization tube (200). The plurality of liquid inlet holes (210) and the plurality of liquid outlet holes (220) are evenly distributed on the flow equalization tube (200). The second manifold (300) is spaced apart from the first manifold (100); Multiple flat tubes (400) are spaced apart from each other and connected between the first manifold (100) and the second manifold (300).

2. The heat exchanger according to claim 1, characterized in that, The heat exchanger includes two flow equalization tubes (200), with the other flow equalization tube (200) disposed within the liquid outlet chamber (130).

3. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes multiple fin assemblies (500) connected between two adjacent flat tubes (400).

4. The heat exchanger according to claim 3, characterized in that, The fin assembly (500) includes a plurality of fin units connected in sequence. Each fin unit includes a connecting part (510) and blades (520). The connecting part (510) is connected between two adjacent flat tubes (400). The plurality of blades (520) are spaced apart from each other and connected at an angle to the connecting part (510). On the connecting part (510), a ventilation hole is provided between two adjacent blades (520).

5. The heat exchanger according to claim 4, characterized in that, The included angle between the blade (520) and the connecting part (510) is 20°-40°.

6. The heat exchanger according to claim 4, characterized in that, Multiple blades (520) are symmetrically arranged on the connecting portion (510).

7. The heat exchanger according to claim 1, characterized in that, The heat exchanger further includes a flow-blocking structure (600), which is disposed inside the second manifold (300). The flow-blocking structure (600) includes a flow-blocking plate (610), which is set at an angle to the liquid flow direction inside the second manifold (300).

8. The heat exchanger according to claim 7, characterized in that, The flow-blocking structure (600) includes a connector (620) and a plurality of flow-blocking plates (610), the plurality of flow-blocking plates (610) being spaced apart from each other, and the connector (620) connecting all the flow-blocking plates (610).

9. The heat exchanger according to claim 1, characterized in that, The flat tube (400) is provided with a protective layer.

10. The heat exchanger according to claim 1, characterized in that, The flat tube (400) is provided with multiple channels, each of which is connected to the first manifold (100) and the second manifold (300).

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