CN220268511U - Liquid gas one-way valve - Google Patents

Abstract

The utility model discloses a liquid-gas one-way valve which comprises a valve body and two connectors respectively arranged at an inlet end and an outlet end of the valve body. Each interface comprises a cutting sleeve nut and a front clip. The positions of the end faces of the inlet end and the outlet end, which are close to the inner wall, are respectively provided with a conical surface I which is folded inwards and is in a horn shape. One end of the front clamp is fixed at the bottom of the clamping sleeve nut and is communicated with the clamping sleeve nut, a conical surface II which diverges outwards and is in a horn shape is arranged at the position, close to the outer wall, of the end face of the other end of the front clamp, and the conical surface II is used for being inserted into the inlet end or the outlet end to be statically sealed with the corresponding conical surface I. The front clamp and the outlet end of the outlet end valve body are provided with conical surfaces which incline outwards, and sealing is realized by adopting the conical openings. Therefore, a special lip-tongue structure is adopted between the valve body and the two connectors, so that leakage of liquid and gas can be prevented.

Description

Liquid gas one-way valve

Technical Field

The utility model relates to a one-way valve, in particular to a liquid-gas one-way valve which can prevent liquid from blocking or prevent corrosion resistance caused by over-high gas pressure.

Background

The one-way valve is a one-way valve which has the functions of corrosion resistance, strong acid and alkali resistance and the like, is used for preventing the reverse flow of liquid flow in a hydraulic system or preventing the reverse flow of compressed air in a gas pipeline system, and is characterized in that the fluid can only flow along a water inlet, but a water outlet medium cannot flow back, and is commonly called as a one-way valve. The check valve is generally designed as a split structure having an inlet end valve body and an outlet end valve body for easy installation of an internal check control assembly. The inlet end valve body and the outlet end valve body are internally provided with a hollow cavity, the inlet end valve body and the outlet end valve body are respectively provided with an air inlet and an air outlet which are communicated with the hollow cavity, the air inlet and the air outlet are respectively connected with different pipelines, and the spring of the unidirectional control assembly is controlled by the pressure difference of the inlet end and the outlet end to drive the sealing platform of the unidirectional control assembly to move, so that the sealing platform is driven to open or close the inlet, and the flow, the speed and the like of gas are controlled. When the air inlet is opened, the medium enters the intermediate chamber along the inlet, flows through the inside of the valve body along the intermediate chamber, and is discharged from the outlet. However, leakage of liquid or gas between the valve body and the two ports is extremely easy.

Disclosure of Invention

In view of the above, the present utility model provides a liquid-gas check valve to solve the technical problem that the leakage of liquid or gas is very easy to occur between the valve body and two connectors of the conventional check valve. A special lip-tongue structure is adopted between the valve body and each connector to prevent liquid and gas from leaking.

The utility model is realized by adopting the following technical scheme: a liquid-gas check valve, comprising:

the valve body comprises an inlet end and an outlet end communicated with the inlet end; and

two interfaces, which are respectively arranged on the inlet end and the outlet end, each interface comprises a clamping sleeve nut; one end of the inside of the clamping sleeve nut is provided with a first accommodating channel, and the other end of the inside of the clamping sleeve nut is provided with a second accommodating channel which is coaxial with and communicated with the first accommodating channel; the diameter of the second accommodating channel is longer than that of the first accommodating channel and is used for being fixedly inserted into the inlet end or the outlet end;

wherein: the positions of the end surfaces of the inlet end and the outlet end, which are close to the inner wall, are respectively provided with a conical surface I which is folded inwards and takes the shape of a horn;

each interface also includes a front card; the front card is accommodated in the accommodating channel II, and the accommodating channel I is communicated with the inlet end or the outlet end through the front card; one end of the front clamp is fixed at the bottom of the second accommodating channel and is communicated with the first accommodating channel, a conical surface II which diverges outwards and is in a horn shape is arranged at the position, close to the outer wall, of the end face of the other end of the front clamp, and the conical surface II is used for being inserted into the inlet end or the outlet end to be statically sealed with the corresponding conical surface I.

As a further improvement of the scheme, the clamping sleeve nut, the front clamp and the valve body are coaxially arranged.

As a further improvement of the above scheme, each interface further comprises a rear card, wherein the rear card is positioned in the second accommodating channel and between the front card and the bottom of the second accommodating channel; the rear card is fixed at the bottom of the second accommodating channel and communicated with the first accommodating channel, the other end of the rear card supports the front card, and the front card is communicated with the first accommodating channel through the rear card.

Further, the shape of the rear card is in a round table shape, the upper table is fixed at the bottom of the second accommodating channel, and the lower table supports the front card.

Still further, the outer diameter of the lower table is greater than the outer diameter of the front card.

As a further improvement of the scheme, an internal thread for the external pipeline to be screwed is arranged in the rear clamp.

As a further improvement of the scheme, the front card and the rear card are of an integrated structure.

As a further improvement of the scheme, one end of the second accommodating channel close to the first accommodating channel is a conical groove which is folded towards the first accommodating channel, the conical groove extends to the joint of the first accommodating channel and the second accommodating channel, the diameter of one end of the rear card close to the first accommodating channel is larger than that of the first accommodating channel, the rear card is fixed on the conical groove wall of the conical groove, and a connecting space is formed between the joint and the rear card.

As a further improvement of the scheme, the second accommodating channel is internally provided with internal threads for being in threaded connection with the inlet end or the outlet end.

As a further improvement of the scheme, the clamping sleeve nut, the rear clamp, the front clamp and the valve body are coaxially arranged.

Compared with the traditional one-way valve, the utility model has the main advantages that:

(1) The front clamp and the outlet end of the outlet end valve body are provided with conical surfaces inclining outwards, and sealing is realized by adopting conical ports. Therefore, a special lip-tongue structure is adopted between the valve body and the two connectors, so that leakage of liquid and gas can be prevented.

(2) The interface adopts a double-card sleeve form of a front card and a rear card, so that leakage at the interface is prevented.

Drawings

Fig. 1 is a cross-sectional view of a liquid-gas check valve provided in this embodiment.

Fig. 2 is an enlarged view of a portion of the lip structure of the liquid-gas check valve of fig. 1.

Fig. 3 is a cross-sectional view of the spring of the liquid-gas check valve of fig. 1.

Fig. 4 is an enlarged view of a portion of the unidirectional control assembly of the liquid-gas unidirectional valve of fig. 1.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Please refer to fig. 1, which is a cross-sectional view of a liquid-gas check valve according to an embodiment of the present utility model. The one-way valve comprises a valve body, two interfaces and a one-way control component. The two interfaces are arranged on the valve body and communicated with a valve path inside the valve body to provide inlet and outlet. The valve way is used for liquid or gas circulation, and the two interfaces are both used for being communicated with the external pipelines, and the connection between the two external pipelines is realized through the valve body.

In the utility model, the valve body is not a single component but is a separate component, and includes two components, namely an inlet-side valve body 8 and an outlet-side valve body 4. Therefore, in the embodiment, the valve body is of a split structure, so that equipment maintenance work such as installation, overhaul, replacement and the like is facilitated.

The input end of the inlet valve body 8 is cylindrical and is provided with external threads for screwing, and is used for screwing the external pipeline, and the input end of the inlet valve body 8 forms the inlet end 86 of the whole liquid-gas one-way valve. The output end of the inlet valve body 8 is provided with a communication groove 82 which is communicated with a valve path I81 in the inlet valve body 8. The communication groove 82, the valve path one 81 and the input end of the inlet end valve body 8 are communicated and can be coaxial. The first valve passage 81 is provided with a buffer groove 73 with a diameter larger than the inlet of the communicating groove 82 at the inlet of the communicating groove 82, namely, on the bottom wall of the communicating groove 82. The bottom wall of the communication groove 82 is provided with a buffer groove II 85 which is coaxial with the valve path I81, and the diameter of the buffer groove I73 is larger than that of the buffer groove II 85. The utility model solves the technical problem that a pipeline (namely a valve path II) is easy to be blocked when impurities exist in fluid by designing the buffer groove I73, and simultaneously can increase more buffer space through the buffer groove II 85, thereby reducing the probability of blocking caused by the existence of the impurities in the fluid.

A sealing ring 83 coaxial with the inlet valve body 8 may be provided on the end face of the outlet end of the inlet valve body 8. An annular step 84 coaxial with the inlet valve body 8 may be provided on the end face of the outlet end of the inlet valve body 8, and a seal ring 83 is fixed to the annular step 84. The sealing ring 83, the annular step 84, and the inlet end valve body 8 may be of an integrally formed construction.

The input end of the outlet end valve body 4 is provided with a plug-in groove 42 communicated with a valve path II 41 in the outlet end valve body 4, the plug-in groove 42 is used for fixedly plugging the output end of the inlet end valve body 8, and the output end of the inlet end valve body 8 can be fixedly plugged in the plug-in groove 42 in a threaded connection mode. The first valve passage 81 and the second valve passage 41 communicate with each other through a communication groove 82. When the inlet valve body 8 is inserted and fixed with the outlet valve body 4, the sealing ring 83 is inserted into the groove wall of the insertion groove 42. The sealing performance between the inlet valve body 8 and the outlet valve body 4 is improved through the sealing ring 83 embedded in the groove wall of the inserting groove 42, and particularly when the inlet valve body 8 and the outlet valve body 4 are inserted by threads, the service lives of the threads of the inlet valve body 8 and the outlet valve body 4 can be prolonged.

When the inlet valve body 8 and the outlet valve body 4 are fixedly connected in an inserting way, an annular tool retracting groove 43 is formed in the side wall of the inserting groove 42 at a position opposite to the annular step 84, and the tool retracting space is reserved for machining threads. The output end of the inlet valve body 8 is fixedly spliced with the input end of the outlet valve body 4 through threaded connection.

Referring to fig. 2, the output end of the outlet valve body 4 and the input end of the inlet valve body 8 may have the same design structure, or may be cylindrical and provided with external threads for screwing. The output end of the outlet end valve body 4 constitutes the outlet end 44 of the whole liquid-gas check valve. The insertion groove 42, the valve path two 41 and the input end of the outlet end valve body 4 are communicated and can be coaxial. The end surfaces of the inlet end 86 and the outlet end 44 are provided with inward-folded conical surfaces 45 which are adjacent to the inner wall.

Two interfaces are mounted on the inlet end 86 and the outlet end 44, respectively, each interface comprising a ferrule nut 1, a rear card 2, a front card 3. The clamping sleeve nut 1, the rear clamp 2, the front clamp 3 and the valve body are coaxially arranged, and the front clamp 3 and the rear clamp 2 can be of an integrated structure. . One end of the inside of the cutting sleeve nut 1 is provided with a first accommodating channel 11, and the other end of the inside is provided with a second accommodating channel 12 which is coaxial with and communicated with the first accommodating channel 11. The second receiving channel 12 is internally threaded for threaded connection with either the inlet end 86 or the outlet end 44. The diameter of the second receiving channel 12 is longer than that of the first receiving channel 11 for the insertion and fixation of the inlet end 86 or the outlet end 44.

The front card 3 is accommodated in the accommodating channel II 12, and the accommodating channel I11 is communicated with the inlet end 86 or the outlet end 44 through the front card 3. The front card 3 and the outlet end of the outlet end valve body 4 have conical surfaces (described below) inclined towards the outer side, and sealing is realized by adopting conical ports. One end of the front card 3 is fixed at the bottom of the second accommodating channel 12 and is communicated with the first accommodating channel 11, a second conical surface 31 which diverges outwards and is in a horn shape is arranged at the position, close to the outer wall, of the end face of the other end of the front card 3, and the second conical surface 31 is used for being inserted into the inlet end 86 or the outlet end 44 to be statically sealed with the corresponding first conical surface 45. The design of direct static seal of the first conical surface 45 and the second conical surface 31 at the outlet end 44 can effectively ensure that liquid or gas leaks from the valve body, and can also effectively prevent corrosion of threads connected between the interface and the valve body. Therefore, the valve bodies at the two ends of the valve body 8 at the inlet end and the valve body 4 at the outlet end are in threaded connection, and the static seal of the valve body is realized by adopting a special lip tongue structure.

The rear card 2 may be omitted, but is arranged as much as possible, so as to ensure the stability of the lip structures of the first 45 and second 31 conical surfaces designed between the front card 3 and the inlet end 86. The rear clip 2 is a split snap ring with internal threads. The rear card 2 is positioned in the second accommodating channel 12 and between the front card 3 and the bottom of the second accommodating channel 12, and an internal thread for the external pipeline to be screwed can be arranged in the rear card 2. The rear card 2 is fixed at the bottom of the second accommodating channel 12 and is communicated with the first accommodating channel 11, the other end of the rear card 2 supports the front card 3, and the front card 3 is communicated with the first accommodating channel 11 through the rear card 2. The shape of the rear card 2 can be a round table, the upper table is fixed at the bottom of the second accommodating channel 12, and the lower table supports the front card 3. The outer diameter of the lower platform is as large as possible than the outer diameter of the front card 3.

The end of the second accommodating channel 12, which is close to the first accommodating channel 11, is a conical groove 13 which is folded towards the first accommodating channel 11, the conical groove 13 extends to the joint of the first accommodating channel 11 and the second accommodating channel 12, the diameter of the end of the rear card 2, which is close to the first accommodating channel 11, is larger than that of the first accommodating channel 11, and the end of the rear card is fixed on the conical groove wall of the conical groove 13, and a joint space 14 is formed between the joint and the rear card 2.

The unidirectional control assembly comprises a sealing table 7, a spring 5 and a hollowed-out gasket 6 which are assembled in a communication groove 82. The diameter of the sealing table 7 is smaller than that of the communicating groove 82, two ends of the spring 5 are abutted between the sealing table 7 and the bottom wall of the inserting groove 42, and the sealing surface 71 of the sealing table 7 is driven to seal the valve path one 81 to the inlet of the communicating groove 82 due to being in a stressed state. In this embodiment, the sealing table 7 is a polytetrafluoroethylene sealing member, and is in contact with the bottom of the inlet valve body 8 to form a face seal. The spring 5 is forced to further compress by increasing the pressure of the valve passage one 81, so that the spring 5 drives the seal surface 71 to unseal the inlet of the valve passage one 81 to the communication groove 82.

Referring to fig. 3, the outer surface of the spring 5 is covered with a corrosion-proof sleeve 51, the sleeve 51 is covered on the outer portion of the spring 5, and then the covered pipes at the two ends of the spring are sealed. According to the utility model, the anti-corrosion sleeve 51 is coated on the outer surface of the spring 5, so that the spring 5 is prevented from being corroded, and the service life of the spring 5 is prolonged. In this embodiment, the spring 5 is a metal inner core, and the composite spring coated with PTFE, such as the sleeve 51, is a layer of 0.3-0.5mn PTFE tubing. When the spring 5 is compressed, the sleeve 51 keeps the spring 5 permanently isolated from the highly corrosive material, thereby protecting the spring 5. When the spring 5 is compressed, the sleeve makes the spring 5 permanently isolated from the highly corrosive material, thereby playing a role in protecting the spring 5. The problem of scaling and blocking of a gap between the material and the spring 5 is also solved by the smoothness of the PTFE pipe and the non-adhesiveness of the PTFE material. All parts of the liquid-gas check valve can be in gas (liquid) contact with the valve body, and special high-purity polytetrafluoroethylene materials can be adopted, so that the valve is acid-resistant, alkali-resistant and corrosion-resistant, and can withstand high temperature of 200 ℃.

Referring to fig. 4, the sealing table 7 is provided with a projection 72 in the shape of a "convex" on the side facing the spring 5. The hollowed-out gasket 6 is positioned and assembled on the protrusion 72 in a mode of being sleeved on the protrusion 721 of the protrusion 72, and a circulation space 61 is formed between the hollowed-out gasket 6 and the sealing table 7. The two ends of the spring 5 are propped between the hollowed-out gasket 6 and the bottom wall of the inserting groove 42. The pre-tightening force of the spring 5 acts on the hollow gasket 6, the hollow gasket presses the sealing table 7 tightly, and when the pressure difference between the inlet and the outlet is smaller than the pre-tightening force of the spring 5, the sealing table 7 is tightly attached to the inside of the valve body 8 at the inlet to form a closed state. When the pressure difference between the inlet and the outlet is larger than the pretightening force of the spring 5, the sealing table 7 is pushed, the valve port is opened, and gas or liquid flows in through the inlet and flows out of the outlet to form unidirectional conduction. The reverse direction forms a seal under the combined action of the spring force and the medium acting force. Therefore, the utility model also outlines the circulation space for the spring 5 to flow into the valve path two 41 after coming out by arranging the hollowed-out gasket 6 and the convex-shaped bulge 72, and by designing the circulation space, even if the spring 5 is formed into a cylinder shape due to compression, a closed space is not formed between the spring 5 and the sealing table 7, so that the problem of liquid blockage or the problem of over-strong gas pressure is thoroughly solved. The sealing table 7 and the protrusion 72 can be in an integrated structure, and the protrusion 72 and the hollow gasket 6 can also be in an integrated structure.

The spring 5 has a certain compression amount at the beginning, the compression force acts on the sealing table 7, the hollowed-out gasket 6 acts on the sealing table 7 with a certain compression force, the force enables the other surface of the sealing table 7 to be tightly attached to the inlet in the inlet valve body 8 to form surface sealing, so that reverse gas and liquid cannot circulate, and a certain amount of reverse pressure difference can be born reversely; in the forward direction, under the condition that the inlet pressure is greater than the pressure of the outlet, the force acts on the sealing table 7, and when the force is greater than the pretightening force of the spring 5, the spring 5 moves leftwards, so that the sealing table 7 is separated from the valve body, namely the valve body 8 at the inlet end, gas or liquid flows in from the inlet, flows through a gap between the sealing table 7 and the hollowed-out gasket 6, flows out from the outlet in the valve body 8 at the inlet end, and the opening and closing of a valve body flow passage are realized through pressure difference. The clamping sleeve nut 1, the rear clamp 2 and the front clamp 3 form a double-clamping sleeve structure, and an inlet 9 and an outlet 10 which are combined on the valve body are connected with a pipeline; the clamping sleeve nut 1 is connected with the valve body through threads.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. A liquid-gas check valve, comprising:

a valve body including an inlet end (86) and an outlet end (44) in communication with the inlet end (86); and

two interfaces mounted on the inlet end (86) and the outlet end (44), respectively, each interface comprising a ferrule nut (1); one end of the inside of the cutting sleeve nut (1) is provided with a first accommodating channel (11), and the other end of the inside is provided with a second accommodating channel (12) which is coaxial with and communicated with the first accommodating channel (11); the diameter of the second accommodating channel (12) is longer than that of the first accommodating channel (11) and is used for being inserted and fixed by the inlet end (86) or the outlet end (44);

the method is characterized in that: the positions, close to the inner wall, of the end faces of the inlet end (86) and the outlet end (44) are provided with conical surfaces I (45) which are folded inwards and are in a horn shape;

each interface also comprises a front card (3); the front card (3) is accommodated in the accommodating channel II (12), and the accommodating channel I (11) is communicated with the inlet end (86) or the outlet end (44) through the front card (3); one end of the front card (3) is fixed at the bottom of the second accommodating channel (12) and is communicated with the first accommodating channel (11), a conical surface II (31) which diverges outwards and is in a horn shape is arranged at the position, close to the outer wall, of the end face of the other end of the front card (3), and the conical surface II (31) is used for being inserted into the inlet end (86) or the outlet end (44) to be statically sealed with the corresponding conical surface I (45).

2. The liquid-gas check valve of claim 1, wherein: the clamping sleeve nut (1), the front clamp (3) and the valve body are coaxially arranged.

3. The liquid-gas check valve of claim 1, wherein: each interface also comprises a rear card (2), and the rear card (2) is positioned in the second accommodating channel (12) and is positioned between the front card (3) and the bottom of the second accommodating channel (12); the rear card (2) is fixed at the bottom of the second accommodating channel (12) and is communicated with the first accommodating channel (11), the other end of the rear card (2) supports the front card (3), and the front card (3) is communicated with the first accommodating channel (11) through the rear card (2).

4. A liquid-gas check valve according to claim 3, wherein: the shape of the rear card (2) is in a round table shape, the upper table is fixed at the bottom of the second accommodating channel (12), and the lower table supports the front card (3).

5. The liquid-gas check valve of claim 4, wherein: the outer diameter of the lower table is larger than that of the front card (3).

6. A liquid-gas check valve according to claim 3, wherein: an internal thread for the external pipeline to be screwed is arranged in the rear clamp (2).

7. A liquid-gas check valve according to claim 3, wherein: the front card (3) and the rear card (2) are of an integrated structure.

8. A liquid-gas check valve according to claim 3, wherein: one end of the accommodating channel II (12) close to the accommodating channel I (11) is a conical groove (13) which is folded towards the accommodating channel I (11), the conical groove (13) extends to the interface of the accommodating channel I (11) and the accommodating channel II (12), the diameter of one end of the rear card (2) close to the accommodating channel I (11) is larger than that of the accommodating channel I (11), and the rear card is fixed on the conical groove wall of the conical groove (13), and a connecting space is formed between the interface and the rear card (2).

9. A liquid-gas check valve according to claim 3, wherein: the second receiving passage (12) is internally provided with internal threads for threaded connection with the inlet end (86) or the outlet end (44).

10. A liquid-gas check valve according to claim 3, wherein: the clamping sleeve nut (1), the rear clamp (2), the front clamp (3) and the valve body are coaxially arranged.