Anti-backflow structure, drainage device, heat exchanger and its electrical equipment

Abstract

The present invention provides a backflow prevention structure, a drainage device, a heat exchanger and an electrical device thereof, which relate to the technical field of evaporative coolers and solve the technical problem that the condensed water of the evaporator in the prior art does not have the function of backflow prevention. The backflow prevention structure includes a shell and a backflow prevention part arranged in the shell, and a liquid inlet and a liquid outlet are arranged on the shell. The backflow prevention part is installed at the liquid inlet and can move along the liquid flow direction under the action of the water pressure generated by the liquid flowing through the liquid inlet so that a water flow gap is formed between the backflow prevention part and the liquid inlet for liquid to pass through. The liquid flowing into the shell through the water flow gap can flow to the liquid outlet through the fluid channel between the inner wall of the shell and the backflow prevention part; at least part of the liquid that flows back into the shell through the liquid outlet can fall into the backflow prevention part, and the backflow prevention part can fall back to the liquid inlet under the action of its elastic force and the gravity of the liquid to seal the liquid inlet. The present invention is used to prevent the condensed water of the pump from flowing back into the evaporator.

Description

Technical Field

[0001] The invention relates to the technical field of evaporative coolers, and in particular to a backflow prevention structure, a drainage device, a heat exchanger and electrical equipment thereof. Background Art

[0002] The existing evaporator condensate does not have a backflow prevention function. When the water pump stops moving, the condensate remaining in the drain pipe will flow back into the evaporator due to gravity, causing rust, odor, bacteria and other problems in the evaporator, affecting the user experience and requiring frequent cleaning and sterilization. Summary of the invention

[0003] The purpose of the present invention is to provide a backflow prevention structure, a drainage device, a heat exchanger and an electrical device thereof, which solves the technical problem in the prior art that the condensed water in the evaporator does not have a backflow prevention function, and the condensed water in the drainage pipe will flow back into the evaporator when the water pump stops moving, causing the evaporator to rust and stink. The various technical effects that can be produced by the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The anti-backflow structure provided by the present invention comprises a shell and an anti-backflow portion arranged in the shell, wherein the shell is provided with a liquid inlet and a liquid outlet, wherein the anti-backflow portion is installed at the liquid inlet and can move along the liquid flow direction under the action of the water pressure generated by the liquid flowing through the liquid inlet so that a water flow gap for liquid to pass is formed between the anti-backflow portion and the liquid inlet, and the liquid flowing into the shell through the water flow gap can flow to the liquid outlet through the fluid channel between the inner wall of the shell and the anti-backflow portion; at least part of the liquid that flows back into the shell through the liquid outlet can fall into the anti-backflow portion, and the anti-backflow portion has an elastic element, and the anti-backflow portion can fall back to the liquid inlet under the action of its elastic force and the gravity of the liquid to seal the liquid inlet.

[0006] As a further improvement of the present invention, the anti-backflow portion includes a reflux liquid receiving portion, a telescopic portion and a sealing portion that can be opened by the water flow of the liquid inlet, the sealing portion is connected to the reflux liquid receiving portion, the reflux liquid receiving portion is connected to the telescopic portion, the telescopic portion is fixedly arranged in the shell, the sealing portion can be opened by the water flow of the liquid inlet and the telescopic portion can be adjusted to a retracted state through the reflux liquid receiving portion, and when no water flows into the shell at the liquid inlet, the telescopic portion is in a reset state and can drive the sealing portion to move to a position abutting the liquid inlet.

[0007] As a further improvement of the present invention, the telescopic part includes a limit column and an elastic element sleeved on the periphery of the limit column, the limit column is fixedly arranged in the shell, the reflux liquid receiving part and the sealing part are both sleeved on the limit column, one end of the elastic element is fixed on the limit column, and the other end is connected to the reflux liquid receiving part, the sealing part can move along the axis of the limit column in a direction away from the liquid inlet under the action of the water pressure at the liquid inlet and can drive the elastic element to compress, and the reflux liquid receiving part can drive the sealing part to fall back to a position abutting the liquid inlet under the action of the elastic force of the elastic element and the gravity of the reflux liquid.

[0008] As a further improvement of the present invention, the shell includes a shell body, a water inlet and a water outlet, the shell body is arranged between the water inlet and the water outlet, the water inlet is provided with the liquid inlet, the water outlet is provided with the liquid outlet, the anti-backflow part is arranged inside the shell body, and there is a fluid channel between the side wall of the shell body and the anti-backflow part that allows the liquid in the shell to flow through, and the inner diameter of the shell body gradually decreases in the direction from the liquid inlet to the liquid outlet.

[0009] As a further improvement of the present invention, a limiting groove recessed away from the shell body is formed on the end of the water inlet part close to the shell body, the limiting column is fixedly arranged in the limiting groove and the sealing part located in the limiting groove can seal the liquid inlet.

[0010] As a further improvement of the present invention, the liquid inlet includes a water outlet pipe connecting section and a water inlet hole, the water outlet pipe connecting section is a groove opened on the water inlet part, the opening of the groove passes through the end surface of the water inlet part away from the shell body, the water outlet pipe of the water pump can be installed inside the groove through the opening of the groove, a plurality of openings are arranged at the bottom of the groove, a plurality of water inlet holes corresponding to the positions of the openings are opened on the limiting groove, and the openings and the corresponding water inlet holes are connected to each other.

[0011] As a further improvement of the present invention, a detachable connection is formed between the side wall of the groove and the water outlet pipe of the water pump by means of threads.

[0012] As a further improvement of the present invention, a blocking portion is provided at the free end of the limiting column, and the two ends of the elastic element are respectively connected to the blocking portion and the reflux liquid receiving portion, and the blocking portion can prevent the reflux liquid receiving portion moving along the axial direction of the limiting column from sliding out of the limiting column.

[0013] As a further improvement of the present invention, the shell body has a conical structure, the water outlet and the water inlet are both cylindrical structures, the water outlet is provided with a liquid outlet running through the axial direction thereof, and the inner diameter of the liquid outlet is equal to the inner diameter of the end of the shell body away from the water inlet.

[0014] As a further improvement of the present invention, a first through hole is provided on the end of the reflux liquid receiving part close to the sealing part, a second through hole is provided on the end of the sealing part close to the reflux liquid receiving part, a reflux liquid inlet is provided on the end surface of the reflux liquid receiving part facing away from the sealing part and the reflux liquid inlet is arranged toward the liquid outlet, a sealing plate for sealing the liquid inlet is provided on the end of the sealing part facing the liquid inlet, a socket is provided on the sealing plate for the limit column to pass through, and the limit column passes through the reflux liquid inlet, the first through hole, the second through hole and the socket in sequence and then is fixed to the limit groove.

[0015] As a further improvement of the present invention, the reflux liquid inlet is arranged directly below the liquid outlet and the inner diameter of the reflux liquid inlet is equal to the inner diameter of the liquid outlet.

[0016] As a further improvement of the present invention, a sealing structure is provided between the first through hole and the limiting column, and between the second through hole and the limiting column.

[0017] As a further improvement of the present invention, an inner side wall of the first through hole and an inner side wall of the second through hole are each provided with an annular mounting groove arranged along the circumferential direction thereof, and the sealing structure is provided in the annular mounting groove.

[0018] As a further improvement of the present invention, the sealing structure is made of rubber material.

[0019] As a further improvement of the present invention, the reflux liquid receiving portion and the sealing portion are both hollow hemispherical bodies and are connected to form a gourd-shaped structure.

[0020] A drainage device comprises a water pump, a water outlet pipe and the anti-backflow structure, wherein the liquid outlet of the water pump is connected to the water outlet pipe, and the water outlet pipe is connected to the anti-backflow structure.

[0021] A heat exchanger comprises the anti-backflow structure.

[0022] As a further improvement of the present invention, the heat exchanger is an evaporator, which includes a water pump, an evaporator body and the anti-backflow structure. The liquid outlet of the water pump is connected to the anti-backflow structure through a water outlet pipe, and the water inlet of the water pump is connected to the evaporator body through a connecting pipe.

[0023] An electrical device comprises the heat exchanger.

[0024] As a further improvement of the present invention, the electrical equipment is an air conditioner.

[0025] The anti-backflow structure provided by the present invention comprises a shell and an anti-backflow part arranged in the shell, a liquid inlet and a liquid outlet are arranged on the shell, and the anti-backflow part is installed at the liquid inlet. When liquid enters the inner cavity of the shell through the liquid inlet of the shell through the water outlet pipe of the water pump, the anti-backflow part is moved upward by the pressure generated by the liquid flowing through the liquid inlet, so that a water flow gap for liquid to pass is formed between the anti-backflow part and the liquid inlet, and the liquid can flow to the inner cavity of the shell through the liquid inlet, and then flow to the liquid outlet through the fluid channel between the inner wall of the shell and the anti-backflow part; on the contrary, when no liquid enters the inner cavity of the shell, the anti-backflow part can fall back to the liquid inlet under the action of its own elastic force, and when the liquid at the liquid outlet flows back to the anti-backflow part, the anti-backflow part is affected by the gravity of the liquid, so that the anti-backflow part can fall back to the liquid inlet faster under the dual action of its elastic force and the gravity of the liquid, thereby improving the sealing of the liquid inlet and making the anti-backflow part fit more closely to the liquid inlet, that is, achieving the purpose of anti-backflow.

[0026] Compared with the prior art, the anti-backflow structure provided by the present invention has the advantage of anti-backflow by arranging an anti-backflow portion inside the shell, thereby preventing condensed water pumped out of the water pump from flowing back into the evaporator and causing problems such as rust, odor, and bacteria in the evaporator, thereby improving user experience and ensuring the normal use of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic diagram of the internal structure of the anti-backflow structure provided by an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the sealing part and the limiting groove provided by an embodiment of the present invention;

[0030] Figure 3 It is a structural schematic diagram of a sealing portion disengaging from a limiting groove provided by an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the shell and the limiting column provided by an embodiment of the present invention;

[0032] Figure 5 This is a first structural schematic diagram of the cooperation between the reflux liquid receiving portion and the sealing portion provided in an embodiment of the present invention;

[0033] Figure 6 It is a second structural schematic diagram of the cooperation between the reflux liquid receiving portion and the sealing portion provided in an embodiment of the present invention;

[0034] Figure 7 is a bottom view of the backflow prevention structure provided by an embodiment of the present invention;

[0035] Figure 8 is a top view of the backflow prevention structure provided by an embodiment of the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of the drainage device provided in an embodiment of the present invention.

[0037] Figure numerals: 1. shell; 11. shell body; 12. water inlet; 13. water outlet; 2. anti-backflow part; 21. reflux liquid receiving part; 211. first perforation; 212. reflux liquid inlet; 22. telescopic part; 221. limiting column; 222. elastic element; 23. sealing part; 231. sealing plate; 232. jack; 3. liquid outlet; 4. liquid inlet; 41. water outlet pipe connecting section; 42. water inlet hole; 5. limiting groove; 6. blocking part; 7. sealing structure; 8. water pump; 9. water outlet pipe; 10. evaporator body. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0039] See also Figure 1-Figure 8 The present invention provides an anti-backflow structure, comprising a shell 1 and an anti-backflow portion 2 arranged in the shell 1, wherein a liquid inlet 4 and a liquid outlet 3 are arranged on the shell 1, wherein the anti-backflow portion 2 is installed at the liquid inlet 4 and can move along the liquid flow direction under the action of the water pressure generated by the liquid flowing through the liquid inlet 4 so that a water flow gap for liquid to pass is formed between the anti-backflow portion 2 and the liquid inlet 4, and the liquid flowing into the shell 1 through the water flow gap can flow to the liquid outlet 3 through the fluid channel between the inner wall of the shell 1 and the anti-backflow portion 2; part of the liquid that flows back into the shell 1 through the liquid outlet 3 can fall into the anti-backflow portion 2, and the anti-backflow portion 2 can fall back to the liquid inlet 4 under the action of its elastic force and the gravity of the liquid to seal the liquid inlet 4.

[0040] Specifically, the anti-backflow portion 2 includes a reflux liquid receiving portion 21, a telescopic portion 22 and a sealing portion 23 that can be opened by the water flow from the liquid inlet 4. The sealing portion 23 is connected to the reflux liquid receiving portion 21, the reflux liquid receiving portion 21 is connected to the telescopic portion 22, the telescopic portion 22 is fixedly arranged in the shell 1, the sealing portion 23 can be opened by the water flow from the liquid inlet 4 and the telescopic portion 22 can be adjusted to a retracted state through the reflux liquid receiving portion 21. When no water flows into the shell 1 at the liquid inlet 4, the telescopic portion 22 is in a reset state and can drive the sealing portion 23 to move to a position abutting against the liquid inlet 4.

[0041] The telescopic part 22 in this embodiment includes a limiting column 221 and an elastic element 222 sleeved on the periphery of the limiting column 221. The elastic element 222 can be a spring. The limiting column 221 is fixedly arranged inside the shell 1. The reflux liquid receiving part 21 and the sealing part 23 are both sleeved on the limiting column 221, and the sealing part 23 is located below the reflux liquid receiving part 21. The reflux liquid receiving part 21 is located below the liquid outlet 3. The liquid outlet 3 and the liquid inlet 4 on the shell 1 are arranged opposite to each other. One end of the elastic element 222 is fixed on the limiting column 221, and the other end is connected to the reflux liquid receiving part 21. The sealing part 23 can move along the axis of the limiting column 221 in the direction away from the liquid inlet 4 under the action of the water pressure at the liquid inlet 4 and can drive the elastic element 222 to compress. That is to say, the elastic element 222 is in a retracted state at this time. Figure 3 When the water pump 8 stops working, the condensed water will fall into the reflux liquid receiving portion when it falls back, and the reflux liquid receiving portion 21 can drive the sealing portion 23 to fall back to the position abutting against the liquid inlet 4 under the elastic force of the elastic element 222 and the gravity of the reflux liquid, as shown in FIG. Figure 2 shown.

[0042] like Figure 4 As shown, the shell 1 includes a shell body 11, a water inlet 12 and a water outlet 13, the shell body 11 is fixedly arranged between the water inlet 12 and the water outlet 13, wherein a liquid inlet 4 is arranged on the water inlet 12, a liquid outlet 3 is arranged on the water outlet 13, and the anti-backflow portion 2 is fixedly arranged inside the shell body 11, and there is a fluid channel between the side wall of the shell body 11 and the anti-backflow portion 2 to allow the liquid in the shell 1 to flow through, thereby ensuring the drainage space and accelerating the smooth discharge of condensed water. In addition, the inner diameter of the shell body 11 gradually decreases from the liquid inlet 4 to the liquid outlet 3. The shell body 11 in this embodiment is a conical structure, the water outlet 13 and the water inlet 12 are both cylindrical structures, and the water outlet 13 is provided with a liquid outlet 3 that runs through its axial direction.

[0043] That is to say, the inner diameter of the shell body 11 in the direction close to the liquid outlet 3 is smaller, so that while ensuring that the reflux liquid receiving part 21 and the sealing part 23 can slide up and down smoothly on the limiting column 221, it is conducive to the condensed water being better caught by the reflux liquid receiving part 21 when it falls back. At the same time, the inner diameter of the liquid outlet 3 is designed to be equal to the inner diameter of the end of the shell body 11 away from the water inlet 12, in order to allow more refluxed condensed water to fall into the reflux liquid receiving part 21, thereby triggering the action of the anti-reflux part 2 faster, mainly to make the reflux liquid receiving part 21 drive the sealing part 23 to fall back to the position of abutting the liquid inlet 4 faster under the elastic force of the elastic element 222 and the gravity of the reflux liquid, and through the gravity of the reflux liquid, the sealing part 23 and the liquid inlet 4 are more closely fitted, so as to better achieve the anti-reflux effect.

[0044] In order to further improve the anti-backflow sealing effect, as an optional implementation method of the embodiment of the present invention, a limiting groove 5 is formed on the end of the water inlet 12 close to the shell body 11, which is recessed in the direction away from the shell body 11. The limiting column 221 is fixedly arranged in the limiting groove 5 and the sealing part 23 located in the limiting groove 5 can seal the liquid inlet 4. The design of the limiting groove 5 plays a limiting role on the sealing part 23, so that the sealing part 23 and the liquid inlet 4 are better matched. If the refluxed condensed water is large, some of the condensed water may not be received by the reflux liquid receiving part 21. The condensed water that cannot be received by the reflux liquid receiving part 21 will flow into the inner cavity of the shell 1, but because the sealing part 23 covers the liquid inlet 4 in the limiting groove 5, it is difficult for the condensed water in the shell 1 to flow back into the evaporator body 10.

[0045] The liquid inlet 4 includes a water outlet pipe connection section 41 and a water inlet hole 42. The water outlet pipe connection section 41 is a groove formed on the water inlet portion 12. The opening of the groove penetrates the end surface of the water inlet portion 12 away from the shell body 11. The water outlet pipe 9 of the water pump 8 can be installed in the groove through the opening of the groove. The bottom of the groove is provided with a plurality of openings, such as Figure 7 The limiting groove 5 is provided with a plurality of water inlet holes 42 corresponding to the opening positions, and the openings and the corresponding water inlet holes 42 are interconnected to ensure that a large upward impact force is formed, which is sufficient to push the sealing part 23 upward, so that the extracted condensed water can flow into the housing 1 through the liquid inlet 4.

[0046] Furthermore, the side wall of the groove and the water outlet pipe 9 of the water pump 8 form a detachable connection by means of threads. Specifically, an internal thread is provided on the inner surface of the side wall of the groove, and an external thread matching the internal thread is provided at the end of the water outlet pipe 9 of the water pump 8 connected to the anti-backflow structure, so as to facilitate disassembly and assembly.

[0047] During the process that the reflux liquid receiving part 21 and the sealing part 23 move along the axial direction of the limiting column 221, considering that the water pressure generated by the liquid inlet 4 is too large, the reflux liquid receiving part 21 and the sealing part 23 may slide off from the limiting column 221, as an optional implementation method of the embodiment of the present invention, a blocking part 6 is provided at the free end of the limiting column 221, and the two ends of the elastic element 222 are respectively connected to the blocking part 6 and the reflux liquid receiving part 21, and the blocking part 6 can prevent the reflux liquid receiving part 21 moving along the axial direction of the limiting column 221 from sliding out of the limiting column 221, thereby ensuring the normal use of the anti-backflow structure.

[0048] Combination Figure 5 and Figure 6 In this embodiment, the reflux liquid receiving portion 21 and the sealing portion 23 are both hollow hemispherical bodies and are connected to form a gourd-shaped structure, and the refluxed condensed water can fall back into the sealing portion 23 through the reflux liquid receiving portion 21. The gourd-shaped structure is integrally sleeved on the limiting column 221 and can move on the limiting column 221. The design of the gourd-shaped structure minimizes the area occupied by the anti-reflux portion 2 during drainage, making drainage smoother.

[0049] like Figure 8 The reflux liquid receiving portion 21 shown is provided with a first through hole 211 at the end near the sealing portion 23, and the sealing portion 23 is provided with a second through hole at the end near the reflux liquid receiving portion 21. The end surface of the reflux liquid receiving portion 21 facing away from the sealing portion 23 is provided with a reflux liquid inlet 212, and the reflux liquid inlet 212 is arranged toward the liquid outlet 3. A sealing plate 231 for sealing the liquid inlet 4 is provided at the end of the sealing portion 23 facing the liquid inlet 4. The sealing plate 231 is provided with a socket 232 for the limiting column 221 to pass through. The limiting column 221 passes through the reflux liquid inlet 212, the first through hole 211, the second through hole, and the socket 232 in sequence and is fixed to the limiting groove 5. The reflux liquid inlet 212 is arranged directly below the liquid outlet 3 and the inner diameter of the reflux liquid inlet 212 is equal to the inner diameter of the liquid outlet 3, so that the reflux liquid receiving part 21 can receive more refluxed condensed water, thereby triggering the reflux liquid receiving part 21 more quickly to drive the sealing part 23 to fall back to the position abutting against the liquid inlet 4 faster under the action of the elastic force of the elastic element 222 and the gravity of the reflux liquid, and through the gravity of the reflux liquid, the sealing part 23 and the liquid inlet 4 are more closely matched.

[0050] A sealing structure 7 is provided between the first through hole 211 and the limiting column 221, and between the second through hole and the limiting column 221. Specifically, an annular mounting groove arranged along the circumferential direction is provided on the inner side wall of the first through hole 211 and the inner side wall of the second through hole, and a sealing structure 7 is provided in the annular mounting groove. The sealing structure 7 is made of rubber material and can be a sealing rubber ring to prevent a large amount of condensed water from penetrating and flowing back.

[0051] The anti-backflow structure provided by the present invention prevents the condensed water pumped out of the water pump 8 from flowing back into the evaporator body 10 through the backflow sealing effect of the gourd-shaped structure under the action of the gravity of the backflowing condensed water and the elastic force of the spring.

[0052] The present invention further provides a drainage device, comprising a water pump 8, a water outlet pipe 9 and the above-mentioned anti-backflow structure, wherein the liquid outlet 3 of the water pump 8 is connected to the water outlet pipe 9, and the water outlet pipe 9 is connected to the anti-backflow structure.

[0053] In addition, the present invention also provides a heat exchanger, comprising the above-mentioned anti-backflow structure. Preferably, the heat exchanger is an evaporator, see Fig. 9 The evaporator includes a water pump 8, an evaporator body 10 and an anti-backflow structure. The liquid outlet of the water pump 8 is connected to the anti-backflow structure through a water outlet pipe 9, and the water inlet of the water pump 8 is connected to the evaporator body 10 through a connecting pipeline.

[0054] like Fig. 9 As shown, the anti-backflow structure is installed at the water outlet of the water pump 8. When the water pump 8 is working, the condensed water in the evaporator body 10 generates a certain water pressure through the liquid inlet 4 on the shell 1. Under the action of the water pressure, the lower end surface of the sealing part 23 will be forced to push up and slowly break away from the limiting groove 5 of the drainage cavity. The spring will also be forced to be compressed upward, and the condensed water in the evaporator body 10 will be discharged from the shell 1 from bottom to top through the fluid channel between the inner wall of the shell 1 and the anti-backflow part 2 through the liquid outlet 3; when the water pump 8 stops working, the condensed water at the liquid outlet 3 falls back into the reflux liquid receiving part 21 through the reflux liquid inlet 212. At the same time, under the action of the spring elastic force, the lower end surface of the sealing part 23 falls into the limiting groove 5 to seal the water inlet hole 42 on the liquid inlet 4. At the same time, the sealing rubber ring prevents the refluxed condensed water from flowing back along the limiting column 221, thereby preventing the condensed water extracted from the water pump 8 from flowing back into the cavity of the evaporator body 10.

[0055] In addition, the present invention also provides an electrical device, including the above-mentioned heat exchanger. When the electrical device is an air conditioner, the water inlet of the water pump 8 is connected to the evaporator body 10 of the air conditioner through a connecting pipe. The above-mentioned drainage device is provided with an anti-backflow structure on the water outlet pipe 9 of the water pump 8, and the return water flow causes the anti-backflow part 2 to seal the liquid inlet 4, effectively preventing the condensed water pumped out by the water pump 8 from flowing back into the drainage pump 8, or even flowing back into the cavity of the evaporator body 10, so as not to pollute the inside of the evaporator body 10, avoid rust, odor, and bacteria, reduce the number of cleaning and sterilization, and improve the user experience.

[0056] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A backflow prevention structure, characterized in that: It comprises a shell and a backflow prevention part arranged in the shell, and the shell is provided with a liquid inlet and a liquid outlet, wherein: The backflow prevention part is installed at the liquid inlet and can move along the liquid flow direction under the action of the water pressure generated by the liquid flowing through the liquid inlet so that a water flow gap for liquid to pass through is formed between the backflow prevention part and the liquid inlet, and the liquid flowing into the shell through the water flow gap can flow to the liquid outlet through the fluid channel between the inner wall of the shell and the backflow prevention part; at least part of the liquid flowing back into the shell through the liquid outlet can fall into the backflow prevention part, and the backflow prevention part has an elastic element, and the backflow prevention part can fall back to the liquid inlet under the action of its elastic force and the gravity of the liquid to seal the liquid inlet; The anti-backflow part includes a backflow liquid receiving part, a telescopic part, and a sealing part that can be opened by the water flow of the liquid inlet, the sealing part is connected to the backflow liquid receiving part, the backflow liquid receiving part is connected to the telescopic part, the telescopic part is fixedly arranged in the shell, the sealing part can be opened by the water flow of the liquid inlet and the telescopic part can be adjusted to a retracted state through the backflow liquid receiving part, and when no water flow enters the shell at the liquid inlet, the telescopic part is in a reset state and can drive the sealing part to move to a position abutting against the liquid inlet; The reflux liquid receiving portion and the sealing portion are both hollow hemispherical bodies and are connected to form a gourd-shaped structure.

2. The backflow prevention structure according to claim 1, characterized in that: The telescopic part includes a limit column and an elastic element sleeved on the periphery of the limit column, the limit column is fixedly arranged in the shell, the reflux liquid receiving part and the sealing part are both sleeved on the limit column, one end of the elastic element is fixed on the limit column, and the other end is connected to the reflux liquid receiving part, the sealing part can move along the axis of the limit column in the direction away from the liquid inlet under the action of the water pressure at the liquid inlet and can drive the elastic element to be compressed, and the reflux liquid receiving part can drive the sealing part to fall back to a position abutting the liquid inlet under the action of the elastic force of the elastic element and the gravity of the reflux liquid.

3. The backflow prevention structure according to claim 2, characterized in that: The shell includes a shell body, a water inlet and a water outlet, the shell body is arranged between the water inlet and the water outlet, the water inlet is provided with the liquid inlet, the water outlet is provided with the liquid outlet, the anti-backflow part is arranged inside the shell body, and the fluid channel allowing the liquid in the shell to flow through exists between the side wall of the shell body and the anti-backflow part, and the inner diameter of the shell body gradually decreases from the liquid inlet to the liquid outlet.

4. The backflow prevention structure according to claim 3, characterized in that: A limiting groove recessed away from the shell body is formed on the water inlet portion at the end portion close to the shell body, the limiting column is fixedly arranged in the limiting groove, and the sealing portion located in the limiting groove can seal the liquid inlet.

5. The backflow prevention structure according to claim 4, characterized in that: The liquid inlet includes a water outlet pipe connecting section and a water inlet hole. The water outlet pipe connecting section is a groove opened on the water inlet part. The opening of the groove passes through the end surface of the water inlet part away from the shell body. The water outlet pipe of the water pump can be installed in the inside of the groove through the opening of the groove. A plurality of openings are arranged at the bottom of the groove. A plurality of water inlet holes corresponding to the positions of the openings are opened on the limiting groove. The openings are connected to the corresponding water inlet holes.

6. The backflow prevention structure according to claim 5, characterized in that: The side wall of the groove and the water outlet pipe of the water pump are detachably connected by means of threads.

7. The backflow prevention structure according to claim 2 or 4, characterized in that: The free end of the limiting column is provided with a blocking part, and the two ends of the elastic element are respectively connected to the blocking part and the reflux liquid receiving part, and the blocking part can prevent the reflux liquid receiving part moving along the axial direction of the limiting column from sliding out of the limiting column.

8. The backflow prevention structure according to claim 3, characterized in that: The shell body is of a conical structure, the water outlet and the water inlet are both of cylindrical structure, the water outlet is provided with a liquid outlet that runs through the axial direction thereof, and the inner diameter of the liquid outlet is equal to the inner diameter of the end of the shell body away from the water inlet.

9. The backflow prevention structure according to claim 4, characterized in that: A first through hole is provided on the end of the reflux liquid receiving part close to the sealing part, a second through hole is provided on the end of the sealing part close to the reflux liquid receiving part, a reflux liquid inlet is provided on the end surface of the reflux liquid receiving part facing away from the sealing part and the reflux liquid inlet is arranged toward the liquid outlet, a sealing plate for sealing the liquid inlet is provided on the end of the sealing part facing the liquid inlet, a plug hole is provided on the sealing plate for the limit column to pass through, and the limit column passes through the reflux liquid inlet, the first through hole, the second through hole and the plug hole in sequence and then is fixed to the limit groove.

10. The backflow prevention structure according to claim 9, characterized in that: The reflux liquid inlet is arranged directly below the liquid outlet and the inner diameter of the reflux liquid inlet is equal to the inner diameter of the liquid outlet.

11. The backflow prevention structure according to claim 10, characterized in that: A sealing structure is provided between the first through hole and the limiting column, and between the second through hole and the limiting column.

12. The backflow prevention structure according to claim 11, characterized in that: An annular mounting groove arranged along the circumferential direction thereof is respectively provided on the inner side wall of the first through hole and the inner side wall of the second through hole, and the sealing structure is provided in the annular mounting groove.

13. The backflow prevention structure according to claim 11, characterized in that: The sealing structure is made of rubber material.

14. A drainage device, characterized in that: It comprises a water pump, a water outlet pipe and the anti-backflow structure according to any one of claims 1 to 13, wherein the liquid outlet of the water pump is connected to the water outlet pipe, and the water outlet pipe is connected to the anti-backflow structure.

15. A heat exchanger, characterized in that: The invention comprises the anti-backflow structure according to any one of claims 1 to 13.

16. The heat exchanger according to claim 15, characterized in that The heat exchanger is an evaporator, which includes a water pump, an evaporator body and the anti-backflow structure. The liquid outlet of the water pump is connected to the anti-backflow structure through a water outlet pipe, and the water inlet of the water pump is connected to the evaporator body through a connecting pipeline.

17. An electrical device, characterized in that: A heat exchanger comprising any one of claims 15 to 16.

18. The electrical device according to claim 17, characterized in that: The electrical equipment is an air conditioner.

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