CN215059774U

CN215059774U - One-way valve

Info

Publication number: CN215059774U
Application number: CN202120485885.4U
Authority: CN
Inventors: 俞舟; 余远航; 康志军
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2021-03-08
Filing date: 2021-03-08
Publication date: 2021-12-07
Anticipated expiration: 2031-03-08

Abstract

The utility model relates to the technical field of valves, especially, relate to a check valve. The utility model provides a pair of check valve, including the casing, the valve pocket has in the casing, set up the import and export that communicate each other with the valve pocket on the casing, still be equipped with the valve port in the casing, be equipped with piston assembly in the valve pocket, piston assembly includes piston rod, first sealing member and second sealing member, and first sealing member overlaps respectively with the second sealing member and locates on the piston rod, and the hardness of first sealing member and second sealing member is different. Compared with the prior art, the utility model has the advantages of: the first sealing element and the second sealing element with different hardness are arranged, so that the sealing performance of the sealing element with low hardness can be enhanced when the valve cavity is in a low-pressure state; when the valve cavity is in a high-pressure state, the two sealing elements simultaneously participate in sealing, the sealing element with high hardness has the advantages of wear resistance, difficulty in aging and long service life, and more reliable sealing is realized.

Description

One-way valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a check valve.

Background

A check valve is a valve that prevents a liquid from flowing backward by allowing the liquid to flow only in one direction and suppressing the liquid from flowing in the opposite direction, and is provided in a hydraulic circuit or a pipe of a refrigeration cycle.

In the existing check valve, the first sealing element and the second sealing element are both made of sealing materials with the same hardness, if the first sealing element and the second sealing element are made of materials with smaller hardness, the valve cavity is poor in wear resistance under a low-pressure state, easy to age and short in service life, and if the first sealing element and the second sealing element are made of materials with larger hardness, the valve cavity is poor in sealing effect under a high-pressure state, internal leakage is easy to generate, and reliable sealing under the high-pressure state is difficult to achieve.

SUMMERY OF THE UTILITY MODEL

In view of this, to above-mentioned technical problem, the utility model provides a adapt to different pressure differentials and sealed reliable check valve.

In order to solve the technical problem, the utility model provides a following technical scheme:

a check valve comprises a shell, wherein a valve cavity is arranged in the shell, an inlet and an outlet which are mutually communicated with the valve cavity are formed in the shell, a valve port is further formed in the shell, a piston assembly is arranged in the valve cavity, and the piston assembly can reciprocate in the valve cavity to open and close the valve port; the piston assembly comprises a piston rod, a first sealing element and a second sealing element, the first sealing element and the second sealing element are respectively sleeved on the piston rod, the first sealing element is arranged close to the valve port relative to the second sealing element, and the hardness of the first sealing element is different from that of the second sealing element.

It can be understood that, the first sealing element and the second sealing element with different hardness are arranged, so that the sealing element with low hardness can realize soft sealing when the valve cavity is in a low-pressure state, and the sealing performance is enhanced; when the valve cavity is in a high-pressure state, the sealing element with high hardness and the sealing element with low hardness can participate in sealing simultaneously, and meanwhile, the sealing element with high hardness has the advantages of abrasion resistance, difficult aging and long service life, so that more reliable sealing can be realized no matter what pressure value the valve cavity is in.

In one embodiment, the first seal has a lower hardness than the second seal, and the first seal abuts the second seal.

It can be understood that when the pressure in the check valve is smaller than a certain value, the first sealing element is used as a first sealing pair to realize sealing, and when the pressure in the check valve is larger than a certain value, the second sealing element is used as a second sealing pair to also participate in sealing, and the two sealing pairs are simultaneously sealed to realize more reliable sealing.

In one embodiment, the first sealing element is a rubber element and the second sealing element is a teflon element.

It can be understood that the sealing form realized by the first sealing element is soft sealing, and the sealing performance is enhanced under the low-pressure-difference working condition; the sealing form that the second sealing member realized is sealed for hard, improves the reliability under the high pressure difference operating mode, guarantees the low internal leakage index under the low pressure simultaneously.

In one embodiment, a valve port is disposed in the housing near the valve port, and the valve port has a first tapered surface, a perpendicular distance from the first tapered surface to the central axis of the housing gradually increases toward a direction away from the valve port, and both the first seal and the second seal can abut against the first tapered surface.

It can be appreciated that the sealing performance is further improved and the leakage rate is reduced by the line-face sealing of the first and second seals with the first tapered surface.

In one embodiment, the first seal has a diameter D₁The diameter of the second sealing element is D₂And satisfy the relationshipFormula (II): d₁≤D₂。

It will be appreciated that the first and second seals may be made to form a two-line face seal with the first tapered face, further enhancing the seal.

In one embodiment, the piston assembly further comprises a gasket abutting against a side surface of the first seal member near the valve port.

It will be appreciated that the shim serves to fix the position of the first and second seals on the piston rod.

In one embodiment, a guide post is further disposed in the valve cavity, and the piston rod is sleeved on the guide post and can move along an axis of the one-way valve relative to the guide post.

It will be appreciated that the guide post serves to guide the piston rod so that it moves smoothly within the valve chamber.

In one embodiment, the piston rod is provided with a guide hole, one end of the guide post penetrates through the guide hole, the guide post is provided with a balance hole, one end of the balance hole is communicated with the guide hole, and the other end of the balance hole is communicated with the outlet.

It will be appreciated that the resistance to the piston rod can be reduced, facilitating movement of the piston rod between the inlet and the outlet.

In one embodiment, the check valve further includes a valve seat disposed at one end of the housing close to the outlet, a positioning member is further disposed in the valve cavity, an outer side of the positioning member is connected to the valve seat, and an inner side of the positioning member is connected to one end of the guide post away from the piston rod.

It will be appreciated that the locating member serves to fix the position of the guide post within the valve chamber.

In one embodiment, a first connecting pipe is arranged at the inlet, a second connecting pipe is arranged at the outlet, and the first connecting pipe and the second connecting pipe are respectively connected to two ends of the shell and are communicated with the valve cavity.

Compared with the prior art, the one-way valve provided by the utility model has the advantages that by arranging the first sealing element and the second sealing element with different hardness, the sealing element with low hardness can realize soft sealing when the valve cavity is in a low-pressure state, so that the sealing performance is enhanced; when the valve cavity is in a high-pressure state, the sealing element with high hardness and the sealing element with low hardness can participate in sealing simultaneously, and meanwhile, the sealing element with high hardness has the advantages of abrasion resistance, difficult aging and long service life, so that more reliable sealing can be realized no matter what pressure value the valve cavity is in.

Drawings

Fig. 1 is a schematic structural view of a check valve provided by the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of the piston assembly provided by the present invention.

The symbols in the drawings represent the following meanings:

100. a one-way valve; 10. a housing; 11. a valve cavity; 12. an inlet; 121. a first adapter tube; 13. an outlet; 131. a second adapter tube; 14. a valve port; 15. a valve port portion; 151. a first tapered surface; 152. a second tapered surface; 20. a piston assembly; 21. a piston rod; 211. a connecting projection; 212. a guide hole; 22. a first seal member; 23. a second seal member; 24. a gasket; 30. a guide post; 31. a balance hole; 40. a valve seat; 50. a positioning member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, the present invention provides a check valve 100, in which the check valve 100 is applied to an air conditioner to prevent backflow of a refrigerant, and can also be used in a hydraulic system to prevent reverse flow of oil or in a pneumatic system to prevent reverse flow of compressed air.

Specifically, the utility model provides a check valve 100 includes casing 10, has valve pocket 11 in the casing 10, offers import 12 and export 13 with valve pocket 11 intercommunication on the casing 10, still is equipped with valve port 14 in the casing 10, is equipped with piston assembly 20 in the valve pocket 11, and piston assembly 20 can be in the valve pocket 11 back and forth movement in order to open and close valve port 14; the piston assembly 20 includes a piston rod 21, a first sealing element 22 and a second sealing element 23, the first sealing element 22 and the second sealing element 23 are respectively sleeved on the piston rod 21, the first sealing element 22 is disposed close to the valve port 14 relative to the second sealing element 23, and the first sealing element 22 and the second sealing element 23 have different hardness.

It should be noted that, in the conventional check valve, the first sealing element and the second sealing element are made of sealing materials with the same hardness, if both sealing elements are made of materials with lower hardness, the valve cavity has poor wear resistance under a low-pressure state, is easy to age and has a short service life, and if both sealing elements are made of materials with higher hardness, the valve cavity has poor sealing effect under a high-pressure state, is easy to leak, and is difficult to realize reliable sealing under the high-pressure state. In the embodiment, the first sealing piece 22 and the second sealing piece 23 with different hardness are arranged, so that the sealing piece with low hardness can realize soft sealing when the valve cavity 11 is in a low-pressure state, and the sealing performance is enhanced; the sealing element with high hardness and the sealing element with low hardness can participate in sealing simultaneously when the valve cavity 11 is in a high-pressure state, and meanwhile, the sealing element with high hardness has the advantages of abrasion resistance, difficult aging and long service life, so that more reliable sealing can be realized no matter what pressure value is in the valve cavity.

As shown in fig. 1, a first connection pipe 121 and a second connection pipe 131 are further respectively disposed at two ends of the housing 10, the first connection pipe 121 is disposed at the inlet 12, the second connection pipe 131 is disposed at the outlet 13, and the first connection pipe 121 and the second connection pipe 131 are respectively connected to two ends of the housing 10, and are communicated with the valve cavity 11, so as to connect pipelines in the air conditioning system.

Specifically, the diameters of the first and

second nipples

121 and 131 are each smaller than the diameter of the housing 10; the housing 10, the first connection pipe 121, and the second connection pipe 131 may be integrally formed or may be separately connected, and are not limited herein.

Preferably, the housing 10 is a long cylinder and is formed as a hollow structure, in this embodiment, the housing 10 is made of cast copper; of course, in other embodiments, the housing 10 may be made of other materials such as cast iron, and is not limited herein.

As shown in fig. 2, in the present embodiment, the hardness of the first seal 22 is lower than that of the second seal 23, and the first seal 22 abuts against the second seal 23. Assuming that a pressure constant value P exists inside the valve cavity 11, when the pressure value inside the valve cavity 11 is smaller than P at a certain time point, the first sealing element 22 only needs to be used as a first sealing pair to realize sealing at this time, and the hardness of the first sealing element 22 is lower, so that the sealing at this time can reach the sealing standard; when the pressure value in the valve cavity 11 at a certain time point is greater than P, the second sealing element 23 is required to be used as a second sealing pair to participate in sealing, the hardness of the second sealing element 23 is higher, so that the internal pressure of the valve cavity 11 with high strength can be borne, the advantages of wear resistance, aging resistance and long service life are also achieved, meanwhile, the two sealing pairs are simultaneously sealed, a better sealing effect can be achieved on the basis of meeting the structural strength, and more reliable sealing is achieved. For example, the value of P may be 0.8MPa, 1MPa, etc., and the specific value may vary depending on the hardness of the first seal 22 and the second seal 23.

Preferably, in the present embodiment, the first sealing element 22 is a rubber element, and the second sealing element 23 is a teflon element, so that the sealing form of the first sealing element 22 is soft sealing, and the sealing performance is enhanced under the low pressure difference working condition; the sealing form that second sealing member 23 realized is hard seal, improves the reliability under the high pressure difference operating mode, guarantees the low internal leakage index under the low pressure simultaneously. Of course, in other embodiments, the first sealing element 22 and the second sealing element 23 may be made of other types of materials according to different application scenarios, and are not limited herein.

Further, a valve port portion 15 is disposed in the housing 10 near the valve port 14, the valve port portion 15 has a first tapered surface 151 facing the valve port 14, the first tapered surface 151 is located at one end of the valve port 14 near the outlet 13, a vertical distance from the first tapered surface 151 to a central axis of the housing 10 gradually increases toward a direction near the outlet 13, and both the first sealing element 22 and the second sealing element 23 can abut against the first tapered surface 151.

It should be noted that, in this embodiment, the first sealing member 22 and the second sealing member 23 are both in a disk shape, so when the first sealing member 22 and the second sealing member 23 abut against the first tapered surface 151, a line-surface seal is formed, and the sealing performance is further improved, and the leakage rate is reduced.

Specifically, the diameter of the first seal 22 is D₁The diameter of the second seal 23 is D₂And satisfies the relation: d₁≤D₂. When the diameter D of the first seal member 22₁Smaller than the diameter D of the second seal 23₂When the first and

second sealing members

22 and 23 are formed in two with the first tapered surface 151The road line surface is sealed, and the sealing performance is further enhanced.

Further, the valve port portion 15 has a second tapered surface 152 facing the valve port 14, the second tapered surface 152 is located at one end of the valve port 14 close to the inlet 12, that is, the first tapered surface 151 and the second tapered surface 152 are located at two sides of the valve port 14, respectively, a vertical distance from the second tapered surface 152 to a central axis of the housing 10 gradually increases toward a direction close to the inlet 12, and the second tapered surface 152 guides the refrigerant flowing into the valve chamber 11 from the inlet 12, so that the refrigerant flows more smoothly.

As shown in fig. 3, the piston assembly 20 further includes a gasket 24, the gasket 24 abuts against the side of the first sealing element 22 close to the valve port 14, and the gasket 24 is used for fixing the positions of the first sealing element 22 and the second sealing element 23 on the piston rod 21. The end of the piston rod 21 close to the valve port 14 is provided with a connecting protrusion 211, the first sealing element 22, the second sealing element 23 and the gasket 24 are all sleeved on the connecting protrusion 211, and by providing the connecting protrusion 211, a connecting structure can be provided for the first sealing element 22, the second sealing element 23 and the gasket 24, so that the first sealing element 22, the second sealing element 23 and the gasket 24 can be conveniently arranged at the end of the piston rod 21.

Further, a guide post 30 is fixedly disposed in the valve cavity 11, the piston rod 21 is sleeved on the guide post 30 and can move along the axis of the check valve 100 relative to the guide post 30, and the guide post 30 is used for guiding the piston rod 21, so that the piston rod 21 can move stably in the valve cavity 11.

Further, a guide hole 212 is formed in the piston rod 21, one end of the guide post 30 penetrates through the guide hole 212, a balance hole 31 is formed in the guide post 30, one end of the balance hole 31 is communicated with the guide hole 212, the other end of the balance hole 31 is communicated with the outlet 13, the guide hole 212 can be communicated with the outlet 13 by utilizing the balance hole 31 in the guide post 30, the outlet 13 is a low-pressure side, and further the interior of the guide hole 212 is low-pressure, so that resistance to the piston rod 21 can be reduced, the piston rod 21 can conveniently move between the inlet 12 and the outlet 13, and normal operation of the check valve 100 is guaranteed.

Furthermore, the valve seat 40 is further disposed at one end of the housing 10 close to the outlet 13, the positioning member 50 is further disposed in the valve cavity 11, an outer side of the positioning member 50 is connected to the valve seat 40, an inner side of the positioning member 50 is connected to one end of the guide post 30 far away from the piston rod 21, and the positioning member 50 is disposed to facilitate fixing the guide post 30 in the valve cavity 11.

Specifically, in the present embodiment, the positioning element 50 is a supporting baffle, and the guiding column 30 and the positioning element 50 may be connected by riveting or welding, which is not limited herein.

During the operation of the check valve 100, when the refrigerant flows from the inlet 12 through the valve chamber 11 to the outlet 13, the piston assembly 20 moves away from the valve port 14 toward the outlet 13, and the refrigerant circulates; when refrigerant flows through the valve cavity 11 from the outlet 13 and then flows to the inlet 12, the piston assembly 20 moves towards the valve port 14 and abuts against the valve port 15, at the moment, the first sealing element 22 and the second sealing element 23 abut against the first conical surface 151 respectively, when the pressure value inside the valve cavity 11 is low, the first sealing element 22 is extruded on the first conical surface 151 to form a first seal, when the pressure value inside the valve cavity 11 is high, the second sealing element 23 is extruded on the first conical surface 151 to form a second seal, and the two seal pairs are sealed simultaneously, so that a better sealing effect can be achieved on the basis of meeting structural strength and wear resistance, and more reliable sealing is achieved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A one-way valve comprises a shell (10), wherein a valve cavity (11) is formed in the shell (10), an inlet (12) and an outlet (13) which are communicated with the valve cavity (11) are formed in the shell (10), a valve port (14) is further formed in the shell (10), a piston assembly (20) is arranged in the valve cavity (11), and the piston assembly (20) can move back and forth in the valve cavity (11) to open and close the valve port (14);

the piston assembly (20) is characterized by comprising a piston rod (21), a first sealing element (22) and a second sealing element (23), wherein the first sealing element (22) and the second sealing element (23) are respectively sleeved on the piston rod (21), the first sealing element (22) is arranged close to the valve port (14) relative to the second sealing element (23), and the first sealing element (22) and the second sealing element (23) are different in hardness.

2. The non-return valve according to claim 1, characterized in that the first seal (22) has a lower hardness than the second seal (23) and in that the first seal (22) abuts the second seal (23).

3. A non-return valve according to claim 1, characterised in that the first seal (22) is a rubber piece and the second seal (23) is a teflon piece.

4. The non-return valve according to claim 1, characterized in that a valve mouth (15) is provided in the housing (10) near the valve port (14), and the valve mouth (15) has a first conical surface (151), the perpendicular distance from the first conical surface (151) to the central axis of the housing (10) gradually increases towards the direction away from the valve port (14), and both the first seal (22) and the second seal (23) can abut against the first conical surface (151).

5. Non-return valve according to claim 1, characterised in that the diameter of the first seal (22) is D₁The diameter of the second sealing element (23) is D₂And satisfy the condition of closingIs represented by the following formula: d₁≤D₂。

6. The check valve of claim 1, wherein the piston assembly (20) further comprises a gasket (24), the gasket (24) abutting a side of the first seal (22) proximate the valve port (14).

7. The check valve according to claim 1, characterized in that a guide post (30) is further disposed in the valve chamber (11), and the piston rod (21) is sleeved on the guide post (30) and can move along the axis of the check valve relative to the guide post (30).

8. The check valve according to claim 7, wherein a guide hole (212) is formed in the piston rod (21), one end of the guide post (30) is inserted into the guide hole (212), a balance hole (31) is formed in the guide post (30), one end of the balance hole (31) is communicated with the guide hole (212), and the other end of the balance hole (31) is communicated with the outlet (13).

9. The check valve according to claim 8, further comprising a valve seat (40), wherein the valve seat (40) is disposed at an end of the housing (10) close to the outlet (13), a positioning member (50) is further disposed in the valve cavity (11), an outer side of the positioning member (50) is connected to the valve seat (40), and an inner side of the positioning member (50) is connected to an end of the guide post (30) far away from the piston rod (21).

10. The check valve of claim 1, wherein a first connection pipe (121) is disposed at the inlet (12), a second connection pipe (131) is disposed at the outlet (13), and the first connection pipe (121) and the second connection pipe (131) are respectively connected to both ends of the housing (10) and communicate with the valve chamber (11).