One-way valve for automobile air conditioner

Abstract

The one-way valve for the automobile air conditioner comprises a valve cover, a valve element pipe and a valve element, the valve element pipe is connected with one end of the valve cover, the valve element is located in the valve element pipe, the valve element is used for blocking the valve element pipe so that fluid can not flow from one end of the valve element pipe, a first ring groove is formed in the end, away from the valve cover, of the valve element pipe, and a first sealing ring is arranged in the first ring groove. A second annular groove is formed in the outer surface of the end, close to the valve element pipe, of the valve deck, a second sealing ring is arranged in the second annular groove, a third annular groove is formed in the outer surface of the middle of the valve deck, and a third sealing ring is arranged in the third annular groove. The sealing performance is good, and air leakage is prevented.

Description

Technical Field

[0001] The utility model relates to the field of check valves, in particular to a check valve for automotive air conditioners. Background Art

[0002] A check valve is a valve that allows fluid to flow only in the inlet direction, and the medium at the outlet cannot flow back, commonly known as a check valve. A check valve is also called a non-return valve or a reflux valve. It is used in hydraulic systems to prevent reverse oil flow or in pneumatic systems to prevent reverse flow of compressed air. There are two types of check valves: straight-through type and angle type. The straight-through check valve is installed on the pipeline by threaded connection. The angle check valve has three forms: threaded connection, plate connection, and flange connection.

[0003] In automotive air conditioners, check valves are also needed to prevent fluid from flowing back. Due to space limitations, the check valves used in automotive air conditioners need to be more convenient for installation and disassembly to facilitate maintenance. They also need to ensure good sealing performance after installation. Although the existing check valves for automotive air conditioners can already meet the basic requirements, how to improve the structure of the check valve to make it simple and have better sealing performance is the current research and development direction. In response to the above problems, a solution is proposed below. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a check valve for automotive air conditioners, which has the advantages of simple structure, convenient installation, and good sealing performance.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A check valve for automotive air conditioners includes a valve cover, a valve core tube, and a valve core. The valve core tube is connected to one end of the valve cover. The valve core is located inside the valve core tube and is used to block the valve core tube so that fluid cannot flow through one end of the valve core tube. A first annular groove is provided at the end of the valve core tube away from the valve cover, and a first sealing ring is provided in the first annular groove. A second annular groove is provided on the outer surface of the end of the valve cover close to the valve core tube, and a second sealing ring is provided in the second annular groove. A third annular groove is provided on the outer surface of the middle of the valve cover, and a third sealing ring is provided in the third annular groove.

[0007] Preferably, the valve cover includes a sealing part and a tail. The second annular groove and the third annular groove are both located on the sealing part. The sealing part is used to be inserted into an external pipeline, and the tail is located outside the external pipeline for connection with other structures inside the air conditioner.

[0008] Preferably, the diameter of the second annular groove is greater than the diameter of the first annular groove, the diameter of the third annular groove is greater than the diameter of the second annular groove, the groove spacing of the first annular groove is greater than the diameter of the first sealing ring, and the groove spacing of the second annular groove is greater than the diameter of the second sealing ring.

[0009] Preferably, a connecting annular groove is provided at one end of the valve cover. One end of the valve core tube is annular, and the annular end of the valve core tube is inserted into the connecting annular groove and is fixedly clamped with the connecting annular groove. A plurality of air outlet holes are formed in the side wall of the valve core tube, and an air inlet hole is formed at the end of the valve core tube far away from the valve cover. The valve core abuts against the air inlet hole of the valve core tube to block the valve core tube.

[0010] Preferably, the valve core includes a guiding valve core and a sealing head. A guiding cavity is provided in the valve cover. One end of the guiding valve core is inserted into the guiding cavity and is slidably connected with the guiding cavity. A connecting cavity is provided at one end of the guiding valve core. A spring is provided in the connecting cavity. The other end of the spring extends out of the connecting cavity and is fixedly connected with the end of the guiding cavity. The spring generates an elastic force on the guiding valve core to enable the guiding valve core to push the sealing head to tightly abut against the air inlet hole of the valve core tube.

[0011] Preferably, a fourth annular groove is provided on the sealing head, and a fourth sealing ring is provided in the fourth annular groove. The fourth annular groove divides the sealing head into a front end portion and a rear end portion. The end far away from the guiding valve core in the fourth annular groove is the front end portion, and the end close to the guiding valve core in the fourth annular groove is the rear end portion. The front end portion is frustum-shaped, and the rear end portion is flat cylindrical. The diameter of the side of the front end portion far away from the rear end portion is smaller, and the diameter at the maximum diameter of the front end portion is smaller than the diameter of the rear end portion. The diameter of the air inlet hole is larger than the maximum diameter of the front end portion and smaller than the diameter of the rear end portion.

[0012] Preferably, the position of the air inlet hole close to the valve cover is an inclined hole. One end of the inclined hole is connected with the air inlet hole, and the inner diameter of the end of the inclined hole far away from the air inlet hole gradually increases. The diameter at the maximum of the inclined hole is larger than the diameter of the rear end portion. The diameter at the minimum of the inclined hole is smaller than the overall diameter of the fourth annular groove and the fourth sealing ring. The overall diameter of the fourth annular groove and the fourth sealing ring is smaller than the diameter of the rear end portion.

[0013] The beneficial effects of the present utility model are as follows: The one-way valve is integrally connected by a plug-in method. And three sealing rings are provided on the outer side of the one-way valve. The first sealing ring and the second sealing ring are respectively arranged on both sides of the air outlet hole of the valve core tube, so that the fluid flowing out of the air outlet hole of the valve core tube cannot leak from the outer side of the one-way valve. The third sealing ring further plays a sealing role to prevent the fluid from flowing out from the position where the valve cover is located when the second sealing ring is damaged. This design has a simple structure and good sealing performance, and can change the sizes of the valve cover and the valve core tube according to the actual connection environment, so that it can be applicable to various environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the embodiment;

[0015] Figure 2 Schematic cross-sectional structure diagram of the embodiment;

[0016] Figure 3 Schematic cross-sectional structure diagram of the embodiment after removing the valve core.

[0017] Reference numerals: 1, valve cover; 2, valve core tube; 3, valve core; 4, first sealing ring; 5, second sealing ring; 6, third sealing ring; 7, sealing part; 8, tail; 9, connecting ring groove; 10, air outlet hole; 11, air inlet hole; 12, guiding tube core; 13, sealing head; 14, guiding cavity; 15, spring; 16, fourth sealing ring; 17, inclined hole. Specific implementation manner

[0018] The following description is only the preferred implementation manner of the present invention, and the protection scope is not limited to this embodiment. All technical solutions falling within the idea of the present invention shall belong to the protection scope of the present invention. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0019] As Figures 1 to 3 shown, a one-way valve for an automotive air conditioner includes a valve cover 1, a valve core tube 2 and a valve core 3. The valve cover 1 includes a sealing part 7 and a tail 8. A second ring groove and a third ring groove are provided on the sealing part 7. A second sealing ring 5 is provided in the second ring groove, and a third sealing ring 6 is provided in the third ring groove. The second sealing ring 5 and the third sealing ring 6 can increase the sealing performance when the valve cover 1 is connected to an external structure. In order to adapt to the connection structure of the one-way valve in this design, in this application, the diameter of the third ring groove is larger than that of the second ring groove. The tail 8 of the valve cover 1 is connected to other structures, mainly to keep the one-way valve stable.

[0020] A connecting ring groove 9 is provided at one end of the valve cover 1. One end of the valve core tube 2 is annular, and the annular end of the valve core tube 2 is inserted into the connecting ring groove 9. In order to increase the connection reliability between the valve core tube 2 and the valve cover 1, a clamping structure or adhesive fixation can also be provided in the connecting ring groove 9 for reinforcement. A first ring groove is provided at the end of the valve core tube 2 away from the valve cover 1, and a first sealing ring 4 is provided in the first ring groove. The first sealing ring 4 can increase the sealing performance between the outer surface of the valve core tube 2 and an external structure.

[0021] The groove pitch of the first annular groove is greater than the diameter of the first sealing ring 4, and the groove pitch of the second annular groove is greater than the diameter of the second sealing ring 5. After installation, the first sealing ring 4 and the second sealing ring 5 will be compressed and deformed. The larger groove pitch allows the first sealing ring 4 and the second sealing ring 5 to have sufficient space for deformation, which can not only ensure the sealing performance but also extend their service life.

[0022] A plurality of air outlet holes 10 are provided on the side wall of the valve core tube 2. The positions where the air outlet holes 10 are located are between the first sealing ring 4 and the second sealing ring 5, so that the fluid flowing out from the air outlet holes 10 cannot flow out from the valve cover 1 or the valve core tube 2, ensuring the sealing performance of the one-way valve.

[0023] An air inlet hole 11 is also provided at the end of the valve core tube 2. The valve core 3 is arranged in the inner cavities of the valve core tube 2 and the valve cover 1. One end of the valve core 3 is used to block the air inlet hole 11 so that the fluid cannot flow through.

[0024] The valve core 3 includes a guiding core tube 12 and a sealing head 13. A guiding cavity 14 is provided in the valve cover 1. One end of the guiding core tube 12 is inserted into the guiding cavity 14 and is slidably connected to the guiding cavity 14. A connecting cavity is provided at one end of the guiding core tube 12, and a spring 15 is provided in the connecting cavity. The other end of the spring 15 is fixedly connected to the end of the guiding cavity 14. In the initial state, the spring 15 is in a compressed state, which will generate a thrust on the guiding core tube 12, making the guiding core tube 12 tend to move towards the valve core tube 2, so that the sealing head 13 can tightly press against the air inlet hole 11.

[0025] A fourth annular groove is provided on the sealing head 13. The other parts of the sealing head 13 are divided into two parts by the fourth annular groove, namely the front end part far from one end of the guiding core tube 12 and the rear end part close to one end of the guiding core tube 12. The front end part is frustum-shaped, and the rear end part is flat cylindrical. The diameter of the frustum-shaped front end part is smaller, which can guide the sealing head 13 into the air inlet hole 11. In order to cooperate with it, an inclined hole 17 is provided at the position of one end of the air inlet hole 11 close to the valve cover 1. The diameter of the end of the inclined hole 17 far from the air inlet hole 11 is larger, which is convenient for the sealing head 13 to enter.

[0026] A fourth sealing ring 16 is provided in the fourth annular groove. When the fourth sealing ring 16 is not compressed, the outer diameter when it surrounds the fourth sealing ring 16 is called the overall diameter of the fourth annular groove and the fourth sealing ring 16. In this design, the overall diameter of the fourth annular groove and the fourth sealing ring 16 is smaller than the diameter of the rear end part. The diameter of the side of the front end part far from the rear end part is smaller, and the diameter at the maximum diameter of the front end part is smaller than the overall diameter of the fourth annular groove and the fourth sealing ring 16. The maximum diameter of the inclined hole 17 is larger than the diameter of the rear end part, and the minimum diameter of the inclined hole 17 is smaller than the overall diameter of the fourth annular groove and the fourth sealing ring 16.

[0027] When the sealing head 13 moves into the inclined hole 17 under the action of thrust, the fourth sealing ring 16 will be compressed to a certain extent and deformed, so that the fourth sealing ring 16 blocks the inclined hole 17, thereby realizing the sealing of the air inlet hole 11. When the external fluid flows from the valve core tube 2 towards the valve cover 1, when the pressure generated by the fluid on the sealing head 13 is greater than the thrust of the spring 15, the fluid can push the sealing head 13 towards the direction of the valve cover 1, so that the fluid enters the valve core tube 2 and finally flows out from a plurality of air outlet holes 10.

[0028] In the specific embodiments described above, the technical problems solved by the present invention, the technical solutions and the beneficial effects have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A one-way valve for automobile air conditioning, comprising a valve cover (1), a valve core tube (2) and a valve core (3), characterized in that: The valve core tube (2) is connected to one end of the valve cover (1), and the valve core (3) is located in the valve core tube (2). The valve core (3) is used to block the valve core tube (2) so that the fluid cannot flow from one end of the valve core tube (2). The end of the valve core tube (2) away from the valve cover (1) is provided with a first annular groove, and a first sealing ring (4) is provided in the first annular groove. The outer surface of the end of the valve cover (1) close to the valve core tube (2) is provided with a second annular groove, and a second sealing ring (5) is provided in the second annular groove. The outer surface of the middle part of the valve cover (1) is provided with a third annular groove, and a third sealing ring (6) is provided in the third annular groove.

2. A one-way valve for automobile air conditioning according to claim 1, characterized in that: The valve cover (1) comprises a sealing portion (7) and a tail portion (8), the second annular groove and the third annular groove are both located on the sealing portion (7), the sealing portion (7) is used to be inserted into an external pipe, and the tail portion (8) is located outside the external pipe so as to be connected to other structures in the air conditioner.

3. A one-way valve for automobile air conditioning according to claim 2, characterized in that: The diameter of the second annular groove is greater than the diameter of the first annular groove, the diameter of the third annular groove is greater than the diameter of the second annular groove, the groove spacing of the first annular groove is greater than the diameter of the first sealing ring (4), and the groove spacing of the second annular groove is greater than the diameter of the second sealing ring (5).

4. A one-way valve for automobile air conditioning according to claim 1, characterized in that: A connecting annular groove (9) is provided at one end of the valve cover (1); one end of the valve core tube (2) is annular, and the annular end of the valve core tube (2) is inserted into the connecting annular groove (9) and is fixedly connected to the connecting annular groove (9); a plurality of air outlet holes (10) are provided on the side wall of the valve core tube (2); an air inlet hole (11) is provided at the end of the valve core tube (2) away from the valve cover (1); the valve core (3) abuts against the air inlet hole (11) of the valve core tube (2) to seal the valve core tube (2).

5. A one-way valve for automobile air conditioning according to claim 4, characterized in that: The valve core (3) comprises a guide tube core (12) and a sealing head (13); a guide cavity (14) is provided in the valve cover (1); one end of the guide tube core (12) is inserted into the guide cavity (14) and is slidably connected to the guide cavity (14); one end of the guide tube core (12) is provided with a connecting cavity; a spring (15) is provided in the connecting cavity; the other end of the spring (15) extends to the outside of the connecting cavity and is fixedly connected to the end of the guide cavity (14); the spring (15) generates elastic force on the guide tube core (12) so that the guide tube core (12) pushes the sealing head (13) to press against the air inlet (11) of the valve core tube (2).

6. A one-way valve for automobile air conditioning according to claim 5, characterized in that: The sealing head (13) is provided with a fourth annular groove, and a fourth sealing ring (16) is provided in the fourth annular groove. The fourth annular groove divides the sealing head (13) into a front end and a rear end. The end of the fourth annular groove away from the guide tube core (12) is the front end, and the end of the fourth annular groove close to the guide tube core (12) is the rear end. The front end is in a truncated cone shape, and the rear end is in a flat cylindrical shape. The diameter of the side of the front end away from the rear end is smaller, and the diameter of the front end at the maximum diameter is smaller than the diameter of the rear end. The diameter of the air inlet (11) is larger than the maximum diameter of the front end and smaller than the diameter of the rear end.

7. A one-way valve for automobile air conditioning according to claim 6, characterized in that: The position of one end of the air inlet hole (11) close to the valve cover (1) is a bevel hole (17), one end of the bevel hole (17) is connected to the air inlet hole (11), the inner diameter of the end of the bevel hole (17) away from the air inlet hole (11) gradually increases, the diameter of the bevel hole (17) at the maximum point is larger than the diameter of the rear end, the diameter of the bevel hole (17) at the minimum point is smaller than the overall diameter of the fourth annular groove and the fourth sealing ring (16), and the overall diameter of the fourth annular groove and the fourth sealing ring (16) is smaller than the diameter of the rear end.

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