CN215981992U

CN215981992U - Pressure retaining valve with novel piston

Info

Publication number: CN215981992U
Application number: CN202121708642.9U
Authority: CN
Inventors: 鲍凯; 蒋维; 虞丹红
Original assignee: Ningbo Sanan Valve Manufacture Co ltd
Current assignee: Ningbo Sanan Valve Manufacture Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2022-03-08
Anticipated expiration: 2031-07-26

Abstract

The application discloses pressure retaining valve with novel piston includes: the gas cylinder release passage is respectively communicated with the inlet and the gas outlet; the valve rod is connected in the valve body in a threaded manner; the piston is arranged in the valve body, the top end of the piston is connected with the bottom end of the valve rod in a matched mode, a first through hole is formed in the piston, an annular sealing groove is formed in the bottom end of the piston, a sealing gasket matched with the sealing groove is arranged in the sealing groove, and the sealing gasket is matched with the air inlet in a sealing mode to form a first valve; and the threaded sleeve is connected in the valve body in a threaded manner, penetrates through the first through hole and is opposite to the air outlet, a guide sleeve and a first spring are arranged in the threaded sleeve, and a sealing ring is arranged on the guide sleeve. This application can be suitable for the gas that the big latus rectum of bottle group and any gaseous demand used and have the pressure retaining valve of novel piston, its convenient assembling to container valve can open completely after the valve core action, and the safe smooth and easy of guarantee fire extinguishing agent is spouted and is put.

Description

Pressure retaining valve with novel piston

Technical Field

The application relates to the technical field of valves, in particular to a pressure retaining valve with a novel piston.

Background

A pressure retaining valve with a novel piston is a valve which can ensure that gas in a gas cylinder is pure and has certain pressure. In the prior art, a piston is arranged in a valve body, and a sealing gasket at the lower end of the piston is in sealing contact with the valve body; the piston is connected with the lower part of the valve rod, a hand wheel is arranged on the upper part of the valve rod, a hand wheel spring is arranged in the hand wheel, the hand wheel spring is tightly pressed on the valve rod through a hand wheel cover, the guide sleeve is arranged in the screw sleeve, the screw sleeve drives the guide sleeve to penetrate through the middle of the valve body and the piston and is connected with the air outlet of the valve body, the guide sleeve is propped against the valve body under the action of the guide sleeve spring, and the upper seal of the guide sleeve is in contact with the valve body to form the valve.

However, the pressure retaining valve with the novel piston for the gas with the structure has the following disadvantages:

(1) the sealed pad in the piston of pressure retaining valve among the prior art compresses tightly at the piston, and sealed pad and the valve body sealing contact through the bottom of piston form the valve, because sealed pad material is nonmetal, and big with piston area of contact, consequently, sealed pad is bloated easily when compressing tightly, and the valve opens and close the in-process many times at the during operation probably causes sealed pad in the piston to break away from, influences the normal work of pressure retaining valve.

(2) Because the sealing gasket material is non-metal, when the hand wheel is rotated to open the valve, namely gas in the bottle is discharged, high-pressure gas in the bottle flows to impact the surface of the sealing gasket, so that static electricity is easy to appear on the surface of the sealing gasket, and unsafe factors exist when inflammable and explosive gas exists, so that the safety problem exists.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a pressure retaining valve with a novel piston, which is suitable for a cylinder group and any gas required to be used in a large diameter. The assembly is convenient, and the valve of the container valve can be completely opened after the valve core acts, thereby ensuring the safe and smooth spraying of the fire extinguishing agent.

To achieve the above objects, the present application provides a pressure retaining valve with a novel piston, comprising:

the gas cylinder release passage is respectively communicated with the gas inlet and the gas outlet;

the valve rod is in threaded connection with the inside of the valve body, the top end of the valve rod is fixedly connected with a hand wheel, and the hand wheel extends out of the valve body;

the piston is arranged in the valve body, the top end of the piston is connected with the bottom end of the valve rod in a matched mode, a first through hole is formed in the piston, an annular sealing groove is formed in the bottom end of the piston, a sealing gasket matched with the sealing groove is arranged in the sealing groove, the sealing gasket is in sealing fit with the air inlet to form a first valve, the valve rod rotates to drive the valve rod to move so as to open and close the first valve, and the first valve controls the on-off of the air inlet and the air bottle release channel; and

the threaded sleeve is connected in the valve body in a threaded mode, penetrates through the first through hole and is opposite to the gas outlet, a guide sleeve and a first spring are arranged in the threaded sleeve, a sealing ring is arranged on the guide sleeve, the first spring abuts against the guide sleeve, so that the sealing ring and the valve body are in sealing fit to form a second valve, and the gas outlet and the gas cylinder release channel are controlled to be opened and closed by the second valve.

Compared with the prior art, the beneficial effect of this application lies in: the seal groove has been seted up to the bottom of piston, the seal groove is the annular, and sealed pad and seal groove adaptation, consequently sealed pad also is the annular, sealed pad has the elastic force, annular sealed pad when packing into annular seal groove, can close up under the effect of self shrink power, make sealed pad support tightly to set up in the seal groove, make sealed pad compress tightly in the seal groove, thereby make sealed pad more firm reliable, can effectively avoid sealed pad after long-time work to drop from the piston bottom, the finished product quality is improved, and the durability of sealed pad use.

As the improvement, the bottom of piston is equipped with the boss, the boss is located the inboard of seal groove, because the material of sealed pad is non-metal, when rotating the hand wheel and opening first valve and release gas in the bottle, the sealed surface of pad is strikeed under the high-pressure gas flow in the bottle, makes sealed pad surface static appears easily, and the boss sets up the inboard at the seal groove, can make gas flow in the gas cylinder produce static accessible boss guide outside the valve body at sealed pad department, guarantees to easily fire the safe handling of explosive gas, improves the security.

As an improvement, the air inlet is vertically arranged, the air inlet is located at the bottom end of the valve body, the air outlet is horizontally arranged, the piston is vertically arranged, the first through hole is transversely formed in the piston and is opposite to the air outlet, and through the improvement, the piston and the air inlet are vertically arranged, so that the piston is convenient to process, and meanwhile, the piston also corresponds to the opening directions of most air cylinders on the market, is suitable for air cylinders of most models, and improves the adaptability of the air cylinders.

As an improvement, the first through hole is rectangular, so that the threaded sleeve penetrates through two sides of the piston hole to form opposite sides, through the improvement, the rectangular first through hole can block the piston from rotating, the hand wheel rotating valve rod can drive the piston to move up and down in the valve body, and the threaded sleeve penetrates through two ends of the piston hole to form opposite sides, so that the piston hole is more convenient to machine, the machining cost is reduced, and the machining efficiency is improved.

As the improvement, be equipped with wheel cap and second spring on the hand wheel, hand wheel cap threaded connection in the top of valve rod, the hand wheel with pass through between the hand wheel cap the second spring supports, the hand wheel rotates and drives piston up-and-down motion through the aforesaid improvement for the hand wheel passes through the wheel cap and the second spring is connected more firmly with the valve rod, and the structure is more stable.

As the improvement, the improved structure comprises a pressing cap, wherein the pressing cap is fixedly connected with the valve body and is in sealing fit with the valve body, the valve rod is in threaded connection with the inside of the pressing cap, the sealing performance of the inside of the valve body can be improved by the aid of the improvement that the pressing cap is in sealing fit with the valve body, the valve rod is in threaded connection with the valve body through the pressing cap, the strength of a single part can be improved by adding the part of the pressing cap, the pressing cap is fixedly connected with the valve body, the pressing cap is in threaded connection with the valve rod, assembly is facilitated, and the strength of the whole structure is improved.

As an improvement, a stroke cavity is formed in the threaded sleeve, one end, far away from the gas outlet, of the guide sleeve is arranged in the stroke cavity in a sliding mode, the first spring abuts between the threaded sleeve and the guide sleeve, and through the improvement, one end, far away from the gas outlet, of the guide sleeve is arranged in the stroke cavity in a sliding mode, so that the guide sleeve can be guaranteed to be connected to the threaded sleeve in a sliding mode all the time, the limiting effect is achieved, and the motion path of the guide sleeve can be effectively planned.

As the improvement, a second through hole is formed in the guide sleeve and is respectively communicated with the stroke cavity and the air outlet, and the pressure maintaining effect can be achieved through the improvement.

As an improvement, an opening is formed in the bottom end of the valve rod, an internal thread is formed in the opening, an external thread meshed with the internal thread is formed in the top of the piston, and through the improvement, the threaded sleeve penetrates through the middle of the piston, so that when the piston is in threaded connection with the valve rod, the valve rod rotates to drive the piston to move up and down.

As an improvement, a friction reducing pad is arranged between the top end of the valve rod and the plane in the pressure cap, and through the improvement, the friction force between the top end of the piston and the pressure cap can be reduced, the durability of the use of the pressure cap is improved, and the service life of the pressure cap is prolonged.

Drawings

FIG. 1 is a cross-sectional view of the overall construction of a pressure retention valve with a novel piston of the present invention;

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

fig. 3 is a cross-sectional view of the overall structure of a prior art pressure retaining valve with a novel piston.

In the figure: 1. a valve body; 11. an air inlet; 12. an air outlet; 13. a gas cylinder release passage; 2. a hand wheel; 21. a wheel cover; 22. a second spring; 3. a valve stem; 4. a piston; 41. a sealing groove; 411. a gasket; 42. a first through hole; 5. a threaded sleeve; 51. a stroke chamber; 6. pressing the cap; 71. a guide sleeve; 711. a seal ring; 712. a second through hole; 72. a first spring; 8. a friction reducing pad.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the orientation words, such as the terms "central", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The application provides a pressure retaining valve with a novel piston, as shown in fig. 1-3, a valve body 1 is provided with an air inlet 11 and an air outlet 12 on the valve body 1, an air bottle release channel 13 is arranged in the valve body 1, and the air bottle release channel 13 is respectively communicated with the air inlet 11 and the air outlet 12;

the valve rod 3 is in threaded connection with the inside of the valve body 1, the top end of the valve rod 3 is fixedly connected with the hand wheel 2, and the hand wheel 2 extends out of the valve body 1;

the piston 4 is arranged in the valve body 1, the top end of the piston 4 is connected with the bottom end of the valve rod 3 in a matched mode, a first through hole 42 is formed in the piston 4, an annular sealing groove 41 is formed in the bottom end of the piston 4, a sealing gasket 411 matched with the sealing groove 41 is arranged in the sealing groove 41, the sealing gasket 411 is matched with the air inlet 11 in a sealing mode to form a first valve, the valve rod 3 rotates to drive the valve rod 3 to move so as to open and close the first valve, and the first valve controls the air inlet 11 and the air bottle release channel 13 to be opened and closed; and

the screw sleeve 5 is connected in the valve body 1 in a threaded manner, the screw sleeve 5 penetrates through the first through hole 42 to be opposite to the gas outlet 12, a guide sleeve 71 and a first spring 72 are arranged in the screw sleeve 5, a sealing ring 711 is arranged on the guide sleeve 71, the first spring 72 is tightly abutted against the guide sleeve 71, so that the sealing ring 711 and the valve body 1 are in sealing fit to form a second valve, and the opening and closing of the second valve control the connection and disconnection of the gas outlet 12 and the gas cylinder release channel 13.

It should be noted that, the sealing fit in the present application may be a sealing contact manner, and sealing is completed by a pressing manner.

Specifically, as shown in fig. 1, a boss 412 is provided at the bottom end of piston 4, and boss 412 is located inside seal groove 41.

In a specific embodiment, the boss 412 may be formed in the middle of the seal groove 41 by forming an annular seal groove 41 at the bottom end of the piston 4.

In another particular embodiment, boss 412 may protrude downward below seal groove 41.

Specifically, as shown in fig. 1, the air inlet 11 is vertically disposed, the air inlet 11 is located at the bottom end of the valve body 1, the air outlet 12 is horizontally disposed, the piston 4 is vertically disposed, the first through hole 42 is transversely disposed on the piston 4, and the first through hole 42 is opposite to the air outlet 12.

Specifically, as shown in fig. 1, the first through hole 42 is rectangular so that two sides of the screw sleeve 5 passing through the hole of the piston 4 are opposite.

Specifically, as shown in fig. 1, a wheel cover 21 and a second spring 22 are arranged on the hand wheel 2, the second spring 22 provides tension, the hand wheel 2 cover is connected to the top end of the valve rod 3 in a threaded manner, the hand wheel 2 and the hand wheel 2 cover are supported by the second spring 22, and the hand wheel 2 rotates to drive the piston 4 to move up and down.

Specifically, as shown in fig. 1, the valve further comprises a pressing cap 6, the pressing cap 6 is fixedly connected with the valve body 1, the pressing cap 6 is in sealing fit with the valve body 1, and the valve rod 3 is in threaded connection with the inside of the pressing cap 6.

Specifically, as shown in fig. 1, a stroke cavity 51 is formed in the screw sleeve 5, one end of the guide sleeve 71 away from the air outlet 12 is slidably disposed in the stroke cavity 51, the first spring 72 abuts between the screw sleeve 5 and the guide sleeve 71, and the first spring 72 provides tension.

Specifically, as shown in fig. 1, a second through hole 712 is formed in the guide sleeve 71, the second through hole 712 is respectively communicated with the stroke cavity 51 and the air outlet 12, and the guide sleeve 71 plays a role of pressure maintaining through the second through hole 712, which is a common technical means in the field, and therefore, detailed description is not repeated in this application.

Preferably, the bottom end of the valve rod 3 is provided with an opening, an internal thread is arranged in the opening, and the top of the piston 4 is provided with an external thread meshed with the internal thread.

Specifically, a friction reducing pad 8 is arranged between the top end of the valve rod 3 and the plane in the pressure cap 6.

The working principle of the application is as follows: the gas cylinder is suitable for being communicated with the gas inlet 11, and the first valve and the second valve are closed under the normal condition, namely the gas inlet 11 and the gas outlet 12 are in a normally closed state; when the gas in the gas cylinder needs to be released, the hand wheel 2 is rotated (anticlockwise), the hand wheel 2 drives the valve rod 3 to rotate, so that the piston 4 moves upwards, so that the first valve is opened, and the gas in the gas cylinder flows from the gas inlet 11 to the valve body 1, since the pressure inside the valve body 1 is higher than the pressure at the gas outlet 12, the gas pressure acts on the guide sleeve 71 and causes the guide sleeve 71 to compress the first spring 72 to move rightward under the pressure of the gas inside the valve body 1, thereby opening the second valve, so that the gas flows out of the gas outlet 12 from the gas inlet 11 through the inner part of the valve body 1, when the gas flows out of the bottle body to reduce the pressure in the valve to a preset value, the guide sleeve 71 moves leftwards under the action of the elastic force of the first spring 72 until the sealing ring 711 on the guide sleeve 71 is in sealing fit with the valve body 1, the second valve is closed, so that pressure difference is formed between the inside and the outside of the valve body 1 and the gas cylinder, and the gas pressure in the valve and the gas cylinder is ensured; when the gas is inflated, the high-pressure gas impacts the guide sleeve 71 from the gas outlet 12, so that the high-pressure gas opens the second valve, the high-pressure gas flows into the gas cylinder from the second valve to the first valve, after the gas is restarted, the hand wheel 2 is rotated (clockwise rotation is adopted) to close the first valve, the inflating device is removed, when other pressure at the gas outlet 12 is reduced to a certain value, the second valve is automatically closed under the action of the first spring 72, the circulation of the gas inside and outside the valve body 1 is blocked, and the purity of the gas in the valve is ensured.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims

1. A pressure retaining valve with a novel piston, comprising:

2. The pressure retaining valve with the novel piston of claim 1, wherein: the bottom end of the piston is provided with a boss, and the boss is located on the inner side of the sealing groove.

3. The pressure retaining valve with the novel piston of claim 1, wherein: the air inlet is vertically arranged, the air inlet is located at the bottom end of the valve body, the air outlet is horizontally arranged, the piston is vertically arranged, the first through hole is transversely arranged on the piston, and the first through hole is opposite to the air outlet.

4. The pressure retaining valve with the novel piston of claim 2, wherein: the first through hole is rectangular, so that two sides of the threaded sleeve penetrating through the piston hole are opposite.

5. The pressure retaining valve with the novel piston of claim 1, wherein: be equipped with wheel cap and second spring on the hand wheel, hand wheel cap threaded connection in the top of valve rod, the hand wheel with pass through between the hand wheel cap the second spring supports, the hand wheel rotates and drives the piston up-and-down motion.

6. The pressure retaining valve with the novel piston of claim 1, wherein: the valve body is fixedly connected with the valve body, the valve rod is in threaded connection with the inside of the pressure cap, and the pressure cap is fixedly connected with the valve body in a sealing mode.

7. The pressure retaining valve with the novel piston of claim 1, wherein: a stroke cavity is formed in the threaded sleeve, one end, far away from the air outlet, of the guide sleeve is arranged in the stroke cavity in a sliding mode, and the first spring abuts between the threaded sleeve and the guide sleeve.

8. The pressure retaining valve with the novel piston of claim 7, wherein: and a second through hole is formed in the guide sleeve and is respectively communicated with the stroke cavity and the air outlet.

9. The pressure retaining valve with the novel piston of claim 1, wherein: the bottom end of the valve rod is provided with an opening, an internal thread is arranged in the opening, and an external thread meshed with the internal thread is arranged at the top of the piston.

10. The pressure retaining valve with the novel piston of claim 6, wherein: and a friction reducing pad is arranged between the top end of the valve rod and the plane in the pressure cap.