Liquid discharge structure and heat exchanger

Abstract

This application relates to a liquid drainage structure and a heat exchanger. The liquid drainage structure includes a first manifold, a liquid suction pipe, and an air outlet pipe. The first manifold is arranged along the vertical direction. The air outlet pipe is arranged between the top and the bottom of the first manifold and communicates with the first manifold. Along the air outlet direction of the air outlet pipe, the inner diameter of the air outlet pipe shows a trend of gradually decreasing first and then gradually increasing. One end of the liquid suction pipe is arranged inside the first manifold and extends along the vertical direction to the bottom of the first manifold, and the other end of the liquid suction pipe extends to the position where the inner diameter of the air outlet pipe is the smallest and communicates with the air outlet pipe. The liquid drainage structure and the heat exchanger provided by this application solve the problem that the existing liquid drainage method causes the volume of the heat exchanger to increase, thereby affecting the installation of the heat exchanger.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and particularly to a liquid discharge structure and a heat exchanger. Background Art

[0002] Generally, a refrigerant is used as a heat exchange medium in a heat exchanger. When it is necessary to replace the refrigerant inside the heat exchanger, a liquid discharge pipeline is usually provided at the lowest part of the heat exchanger. However, the setting of the liquid discharge pipeline will increase the volume of the heat exchanger, thereby affecting the installation of the heat exchanger in a vehicle. Summary of the Invention

[0003] Based on this, it is necessary to provide a liquid discharge structure and a heat exchanger to solve the problem that the existing liquid discharge method causes an increase in the volume of the heat exchanger, thereby affecting the installation of the heat exchanger.

[0004] The liquid discharge structure provided by the present application includes a first manifold, a liquid suction pipe, and an air outlet pipe. The first manifold is arranged along the vertical direction. The air outlet pipe is arranged between the top and the bottom of the first manifold and communicates with the first manifold. Along the air outlet direction of the air outlet pipe, the inner diameter of the air outlet pipe shows a trend of gradually decreasing first and then gradually increasing. One end of the liquid suction pipe is arranged inside the first manifold and extends along the vertical direction to the bottom of the first manifold, and the other end of the liquid suction pipe extends to the position where the inner diameter of the air outlet pipe is the smallest and communicates with the air outlet pipe.

[0005] In one embodiment, a spiral groove is provided on the inner wall of the liquid suction pipe so that gas can be spirally introduced into the air outlet pipe along the spiral groove. With this arrangement, the discharge rate of the liquid in the first manifold is increased.

[0006] In one embodiment, spiral protrusions are provided on the inner wall of the liquid suction pipe, and a spiral groove is formed by enclosing the adjacent spiral protrusions and the inner wall of the liquid suction pipe. With this arrangement, the processing difficulty of the spiral groove is greatly reduced.

[0007] In one embodiment, the end of the liquid suction pipe extending to the bottom of the first manifold is provided with a stop inclined surface, and a stop head is correspondingly provided at the bottom of the first manifold for the stop inclined surface. The stop head stops at both ends of the stop inclined surface along the circumferential direction of the liquid suction pipe to prevent the liquid suction pipe from rotating around its own axis. In this way, the rotation of the liquid suction pipe around its own axis can be prevented, and the assembly firmness of the liquid discharge structure is greatly improved.

[0008] In one embodiment, the stop head is provided with a mating inclined surface corresponding to the stop inclined surface, and the stop head is correspondingly attached to the stop inclined surface through the mating inclined surface. In this way, the mating tightness between the stop head and the liquid suction pipe is improved.

[0009] In one embodiment, the stopper is provided with a communication groove. The communication groove includes a first opening provided at the top of the stopper and a second opening provided at the side of the stopper. The communication groove communicates with the liquid suction pipe through the first opening, and the communication groove communicates with the first manifold through the second opening. In this way, the stopper is prevented from affecting the liquid suction pipe from sucking the liquid in the first manifold.

[0010] In one embodiment, the liquid discharge structure further includes a plurality of buckles. One end of each buckle is detachably connected to the inner wall of the first manifold, and the other end is clamped to the outer wall of the liquid suction pipe. The plurality of buckles are arranged at intervals along the extending direction of the liquid suction pipe. In this way, the liquid suction pipe is prevented from shaking in the first manifold, and the stability of the liquid discharge structure is improved.

[0011] In one embodiment, a plurality of clamping rings are provided on the outer wall of the liquid suction pipe. The plurality of clamping rings stop on both sides of the buckle along the extending direction of the liquid suction pipe. In this way, the liquid suction pipe can be prevented from moving up and down in the first manifold.

[0012] In one embodiment, the vertical height h of the air outlet pipe and the total vertical height H of the first manifold satisfy 0.4H < h < 0.5H. With such a setting, the rate of the liquid suction pipe discharging the liquid in the first manifold is greatly enhanced.

[0013] The present application also provides a heat exchanger, which includes an air inlet pipe, a second manifold, a core body, and the liquid discharge structure as described in any one of the above embodiments. The air inlet pipe is provided between the top and the bottom of the second manifold and communicates with the second manifold. The core body is provided between the first manifold and the second manifold and communicates with the first manifold and the second manifold.

[0014] Compared with the prior art, for the liquid discharge structure and the heat exchanger provided by the present application, since the inner diameter of the air outlet pipe gradually decreases first and then gradually increases along the air outlet direction of the air outlet pipe, when the gas enters the air outlet pipe from the first manifold and flows along the air outlet direction of the air outlet pipe, the flow rate of the gas first increases and then decreases. And at the position where the inner diameter of the air outlet pipe is the smallest, the flow rate of the gas reaches the maximum. According to the Venturi effect, a low pressure will be generated near the high-speed flowing fluid, thereby generating an adsorption effect. In this way, by providing the liquid suction pipe, the liquid located at the bottom of the first manifold can be sucked into the air outlet pipe through the liquid suction pipe and carried away by the gas in the air outlet pipe. Since one end of the liquid suction pipe is provided in the first manifold and the other end is provided in the air outlet pipe, setting the liquid suction pipe will not increase the volume of the liquid discharge structure or even the entire heat exchanger. In this way, not only can the liquid in the heat exchanger be effectively discharged, but also the difficulty of installing the heat exchanger due to its too large volume can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of a heat exchanger according to an embodiment provided by the present application;

[0017] Figure 2 Exploded view of a heat exchanger according to an embodiment provided by the present application;

[0018] Figure 3 Partial structural schematic diagram of a liquid discharge structure according to an embodiment provided by the present application;

[0019] Figure 4 is Figure 3 Enlarged view of the position marked as A shown in;

[0020] Figure 5 is Figure 3 Enlarged view of the position marked as B shown in;

[0021] Figure 6 Cross-sectional view of the liquid discharge structure at the gas outlet pipe according to an embodiment provided by the present application;

[0022] Figure 7 Partial cross-sectional view of a liquid discharge structure according to an embodiment provided by the present application.

[0023] Reference numerals: 100, first manifold; 200, liquid suction pipe; 210, anti-rotation inclined surface; 220, snap ring; 300, gas outlet pipe; 310, contraction section; 311, card slot; 320, expansion section; 330, first straight pipe section; 340, second straight pipe section; 350, third straight pipe section; 400, stop head; 410, communication groove; 500, buckle; 600, air inlet pipe; 700, second manifold; 800, core body. Detailed implementation manners

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0026] In the present application, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Generally, a refrigerant is used as the heat exchange medium in a heat exchanger. When it is necessary to replace the refrigerant inside the heat exchanger, a drain pipe is usually provided at the lowest part of the heat exchanger. However, the setting of the drain pipe will increase the volume of the heat exchanger, thereby affecting the installation of the heat exchanger in the vehicle.

[0031] Please refer to Figures 1-7 , to solve the problem that the existing drainage method causes the volume of the heat exchanger to increase, thereby affecting the installation of the heat exchanger, this application provides a drainage structure, which includes a first manifold 100, a liquid suction pipe 200 and an air outlet pipe 300. The first manifold 100 is arranged along the vertical direction. The air outlet pipe 300 is arranged between the top and the bottom of the first manifold 100 and communicates with the first manifold 100. Along the air outlet direction of the air outlet pipe 300, the inner diameter of the air outlet pipe 300 first gradually decreases and then gradually increases. One end of the liquid suction pipe 200 is arranged inside the first manifold 100 and extends along the vertical direction to the bottom of the first manifold 100. The other end of the liquid suction pipe 200 extends to the position where the inner diameter of the air outlet pipe 300 is the smallest and communicates with the air outlet pipe 300.

[0032] Since the inner diameter of the air outlet pipe 300 first gradually decreases and then gradually increases along the air outlet direction of the air outlet pipe 300, when the gas enters the air outlet pipe 300 from the first manifold 100 and flows along the air outlet direction of the air outlet pipe 300, the flow rate of the gas first increases and then decreases. And at the position where the inner diameter of the air outlet pipe 300 is the smallest, the flow rate of the gas reaches the maximum. According to the Venturi effect, a low pressure will be generated near the high-speed flowing fluid, thus generating an adsorption effect. In this way, by setting the liquid suction pipe 200, the liquid located at the bottom of the first manifold 100 can be sucked into the air outlet pipe 300 through the liquid suction pipe 200 and carried away by the gas in the air outlet pipe 300. Since one end of the liquid suction pipe 200 is arranged in the first manifold 100 and the other end is arranged in the air outlet pipe 300, setting the liquid suction pipe 200 will not increase the volume of the liquid drainage structure or even the entire heat exchanger. In this way, not only can the liquid in the heat exchanger be effectively discharged, but also the difficulty of installing the heat exchanger due to its too large volume can be avoided.

[0033] It should be emphasized that in this application document, the fluid includes but is not limited to gas.

[0034] Specifically, in one embodiment, the liquid suction pipe 200 is integrally L-shaped.

[0035] In one embodiment, as Figure 6 shown, the air outlet pipe 300 includes a contraction section 310 and an expansion section 320 that are sequentially connected along the air outlet direction. And along the air outlet direction of the air outlet pipe 300, the inner diameter of the contraction section 310 gradually decreases, and the inner diameter of the expansion section 320 gradually increases. The inclination degree of the inner wall of the contraction section 310 relative to the axis of the air outlet pipe 300 is greater than the inclination degree of the inner wall of the expansion section 320 relative to the axis of the air outlet pipe 300.

[0036] It should be noted that the inclination degree of the inner wall of the contraction section 310 relative to the axis of the air outlet pipe 300 being greater than the inclination degree of the inner wall of the expansion section 320 relative to the axis of the air outlet pipe 300 means that the contraction amplitude of the inner diameter of the contraction section 310 is more intense, and the expansion amplitude of the inner diameter of the expansion section 320 is more gentle.

[0037] With such a setting, the length of the contraction section 310 can be reduced, thereby reducing the length of the entire air outlet pipe 300, and further reducing the volume of the liquid drainage structure. And with such a setting, it can be avoided that the gas forms a reflux vortex at the expansion section 320, resulting in turbulent flow in the air outlet pipe 300.

[0038] Specifically, in one embodiment, along the air outlet direction of the air outlet pipe 300, the inner wall of the contraction section 310 can extend linearly or curvilinearly. Similarly, along the air outlet direction of the air outlet pipe 300, the inner wall of the expansion section 320 can extend linearly or curvilinearly.

[0039] In one embodiment, asFigure 6 and Figure 7 As shown, a clamping groove 311 is provided on the inner wall of the air outlet pipe 300. One end of the liquid suction pipe 200 extending into the air outlet pipe 300 is partially clamped into the clamping groove 311. Moreover, the axis of the end of the liquid suction pipe 200 extending into the air outlet pipe 300 is the tangent of the inner wall at the connection of the contraction section 310 and the expansion section 320.

[0040] The suction force is the strongest at the inner wall at the connection of the contraction section 310 and the expansion section 320. Therefore, with such a setting, the liquid in the first manifold 100 can be sucked into the air outlet pipe 300 more quickly. And by providing the clamping groove 311, the liquid suction pipe 200 can be prevented from rotating in the air outlet pipe 300, improving the stability of the liquid discharge structure.

[0041] Further, in one embodiment, as Figure 7 shown, the clamping groove 311 is provided at the bottom of the air outlet pipe 300.

[0042] In this way, the volume occupied by the liquid suction pipe 200 in the air outlet pipe 300 can be minimized, avoiding interference with the flow of gas in the air outlet pipe 300 by the liquid suction pipe 200. And with such a setting, it can be avoided that the liquid continues to sink in the air outlet pipe 300 and causes the liquid to flow back into the first manifold 100.

[0043] Further, in one embodiment, as Figure 6 shown, the air outlet pipe 300 further includes a first straight pipe section 330, a second straight pipe section 340 and a third straight pipe section 350. Moreover, the first manifold 100, the first straight pipe section 330, the contraction section 310, the third straight pipe section 350, the expansion section 320 and the second straight pipe section 340 are connected in sequence along the liquid outlet direction.

[0044] In this way, the air outlet pipe 300 can be assembled to the first manifold 100 through the first straight pipe section 330, and the air outlet pipe 300 can be assembled to the external pipeline through the second straight pipe section 340. With such a setting, the assembly difficulty of the liquid discharge structure is reduced.

[0045] In order to improve the discharge rate of the liquid in the first manifold 100, in one embodiment, the vertical height h of the air outlet pipe 300 and the total vertical height H of the first manifold 100 satisfy 0.4H < h < 0.5H.

[0046] Due to the existence of gravity, the descending speed of the gas in the first manifold 100 is greater than the ascending speed of the gas in the first manifold 100. Through a large number of simulation experiments, it is obtained that the intersection point of the descending gas and the ascending gas in the first manifold 100 is between two-fifths and one-half of the height of the first manifold 100. And when the descending gas and the ascending gas meet and immediately enter the intake pipe 600, the kinetic energy loss of the gas in the first manifold 100 is the smallest. That is to say, setting the vertical height of the outlet pipe 300 between two-fifths and one-half of the height of the first manifold 100 can minimize the kinetic energy loss of the gas in the first manifold 100, that is, the gas in the outlet pipe 300 can obtain the maximum flow rate. On the contrary, if the descending gas and the ascending gas cannot immediately enter the outlet pipe 300 after meeting, the gas after meeting needs to continue to rise or fall. In this way, the gas after meeting will continue to collide with the ascending gas or the descending gas before entering the outlet pipe 300. At this time, the kinetic energy of the gas in the first manifold 100 will be further dissipated. In summary, such a setting can maximize the flow rate of the gas in the outlet pipe 300, that is, it can maximize the pressure difference between the liquid at the bottom of the first manifold 100 and the fluid at the minimum inner diameter of the intake pipe 600, that is, greatly enhance the rate of the liquid discharged from the first manifold 100 by the liquid suction pipe 200.

[0047] Further, in an embodiment, h = 0.45H.

[0048] In order to further improve the discharge rate of the liquid in the first manifold 100, in an embodiment, the inner wall of the liquid suction pipe 200 is provided with a spiral groove (not shown in the figure) so that the gas can spiral into the outlet pipe 300 along the spiral groove.

[0049] Under the action of the Coriolis force, after the liquid enters the liquid suction pipe 200 from one end close to the bottom of the first manifold 100, it will form a vortex along the spiral groove. If in the Northern Hemisphere, the vortex rotates counterclockwise under the action of the Coriolis force. If in the Southern Hemisphere, the vortex rotates clockwise under the action of the Coriolis force. Therefore, with such a setting, the Coriolis force will enhance the liquid vortex in the liquid suction pipe 200, thereby increasing the flow rate of the liquid in the liquid suction pipe 200, and further improving the discharge rate of the liquid in the first manifold 100.

[0050] Specifically, in an embodiment, the inner wall of the liquid suction pipe 200 is provided with spiral protrusions (not shown in the figure), and the adjacent spiral protrusions and the inner wall of the liquid suction pipe 200 enclose to form a spiral groove.

[0051] In this way, the processing difficulty of the spiral groove is greatly reduced.

[0052] In an embodiment, asFigure 4 As shown, one end of the liquid suction pipe 200 extending to the bottom of the first manifold 100 is provided with an anti-rotation inclined surface 210. A stop head 400 is provided at the bottom of the first manifold 100 corresponding to the anti-rotation inclined surface 210. The stop head 400 circumferentially stops at both ends of the anti-rotation inclined surface 210 along the liquid suction pipe 200 to prevent the liquid suction pipe 200 from rotating around its own axis.

[0053] In this way, the rotation of the liquid suction pipe 200 around its own axis can be prevented, greatly improving the assembly firmness of the liquid discharge structure.

[0054] Specifically, in one embodiment, the stop head 400 is provided with a mating inclined surface (not shown in the figure) corresponding to the anti-rotation inclined surface 210, and the stop head 400 is correspondingly attached to the anti-rotation inclined surface 210 through the mating inclined surface.

[0055] In this way, the mating tightness between the stop head 400 and the liquid suction pipe 200 is improved.

[0056] Furthermore, in one embodiment, as Figure 4 shown, the stop head 400 is provided with a communication groove 410. The communication groove 410 includes a first opening provided at the top of the stop head 400 and a second opening provided at the side of the stop head 400. The communication groove 410 communicates with the liquid suction pipe 200 through the first opening, and the communication groove 410 communicates with the first manifold 100 through the second opening.

[0057] In this way, the influence of the stop head 400 on the liquid suction pipe 200 sucking the liquid in the first manifold 100 is avoided.

[0058] In one embodiment, as Figure 3 and Figure 5 shown, the liquid discharge structure further includes a plurality of buckles 500. One end of the buckle 500 is detachably connected to the inner wall of the first manifold 100, and the other end is clamped to the outer wall of the liquid suction pipe 200, and the plurality of buckles 500 are arranged at intervals along the extension direction of the liquid suction pipe 200.

[0059] In this way, the liquid suction pipe 200 is prevented from shaking in the first manifold 100, improving the stability of the liquid discharge structure.

[0060] Furthermore, in one embodiment, as Figure 5 shown, the outer wall of the liquid suction pipe 200 is provided with a plurality of clamping rings 220. The plurality of clamping rings 220 stop at both sides of the buckle 500 along the extension direction of the liquid suction pipe 200.

[0061] In this way, the liquid suction pipe 200 can be prevented from moving up and down in the first manifold 100.

[0062] In this embodiment, the buckle 500 can also cooperate with the stop head 400 to limit the up and down movement of the liquid suction pipe 200.

[0063] Please refer to Figure 1 and Figure 2 Furthermore, the present application also provides a heat exchanger, which includes an inlet pipe 600, a second header 700, a core body 800, and a liquid drainage structure as described in the above embodiments. The inlet pipe 600 is disposed between the top and bottom of the second header 700 and is in communication with the second header 700. The core body 800 is disposed between the first header 100 and the second header 700 and is in communication with the first header 100 and the second header 700.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0065] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A liquid discharging structure, characterized in that, It includes a first manifold (100), a liquid suction pipe (200) and an air outlet pipe (300). The first manifold (100) is arranged along the vertical direction. The air outlet pipe (300) is arranged between the top and the bottom of the first manifold (100) and communicates with the first manifold (100). Along the air outlet direction of the air outlet pipe (300), the inner diameter of the air outlet pipe (300) first gradually decreases and then gradually increases. One end of the liquid suction pipe (200) is arranged inside the first manifold (100) and extends along the vertical direction to the bottom of the first manifold (100). The other end of the liquid suction pipe (200) extends to the position where the inner diameter of the air outlet pipe (300) is the smallest and communicates with the air outlet pipe (300). The inner wall of the liquid suction pipe (200) is provided with a spiral groove so that gas can spiral into the air outlet pipe (300) along the spiral groove. One end of the liquid suction pipe (200) extending to the bottom of the first manifold (100) is provided with a rotation prevention inclined surface (210). A stop head (400) is provided at the bottom of the first manifold (100) corresponding to the rotation prevention inclined surface (210). The stop head (400) circumferentially stops at both ends of the rotation prevention inclined surface (210) along the liquid suction pipe (200) to prevent the liquid suction pipe (200) from rotating around its own axis. The stop head (400) is provided with a communication groove (410). The communication groove (410) includes a first opening provided at the top of the stop head (400) and a second opening provided at the side of the stop head (400). The communication groove (410) communicates with the liquid suction pipe (200) through the first opening, and the communication groove (410) communicates with the first manifold (100) through the second opening.

2. The liquid discharge structure according to claim 1, characterized in that, The inner wall of the liquid suction pipe (200) is provided with spiral protrusions. The adjacent spiral protrusions and the inner wall of the liquid suction pipe (200) enclose to form the spiral groove.

3. The liquid discharge structure according to claim 1, wherein The stop head (400) is provided with a mating inclined surface corresponding to the rotation prevention inclined surface (210). The stop head (400) correspondingly fits the rotation prevention inclined surface (210) through the mating inclined surface.

4. The liquid discharge structure according to claim 1, wherein It further includes a plurality of buckles (500). One end of the buckle (500) is detachably connected to the inner wall of the first manifold (100), and the other end is clamped to the outer wall of the liquid suction pipe (200). The plurality of buckles (500) are arranged at intervals along the extension direction of the liquid suction pipe (200).

5. The liquid discharge structure according to claim 4, wherein The outer wall of the liquid suction pipe (200) is provided with a plurality of clamping rings (220). The plurality of clamping rings (220) stop at both sides of the buckle (500) along the extension direction of the liquid suction pipe (200).

6. The liquid discharge structure according to claim 1, characterized in that, The vertical height h of the air outlet pipe (300) and the total vertical height H of the first manifold (100) satisfy 0.4H < h < 0.5H.

7. A heat exchanger, characterized in that, It includes an intake pipe (600), a second manifold (700), a core body (800), and a liquid discharge structure as described in any one of claims 1 to 6. The intake pipe (600) is provided between the top and the bottom of the second manifold (700) and communicates with the second manifold (700). The core body (800) is provided between the first manifold (100) and the second manifold (700) and communicates with the first manifold (100) and the second manifold (700).

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