WO2022217757A1

WO2022217757A1 - Valve

Info

Publication number: WO2022217757A1
Application number: PCT/CN2021/103573
Authority: WO
Inventors: 吴京祥
Original assignee: 多立恒（北京）能源技术股份公司
Priority date: 2021-04-16
Filing date: 2021-06-30
Publication date: 2022-10-20
Also published as: DE212021000561U1

Abstract

A valve, comprising a valve body (1), wherein a through hole extending in an axial direction is provided in the valve body (1), a first valve port (I) is formed at the lower end of the through hole, and a second valve port (O) in communication with the through hole is provided in an inner wall of the valve body (1). An inner side wall of the valve body (1) is provided with a first sealing face on an upper side of the second valve port (O); and further comprised are a first sealing member (2) which is fixedly supported on the first sealing face, and a corrugated pipe sealing member, which is mounted at the upper end inside the valve body (1). The corrugated pipe sealing member comprises an inner core (3) and a corrugated pipe (4) sleeved on the inner core (3), wherein the inner core (3) can move in the axial direction of the valve body (1), so as to seal or open the first valve port (I). The axial lower end of the corrugated pipe (4) is fixedly connected to the inner core (3), and the upper end is hermetically connected to the first sealing member (2). The valve changes the sealing manner, uses static sealing, improves the service life of the sealing member, and increases the sealing reliability.

Description

a valve

This application claims the priority of the Chinese patent application with the application number 202110411409.2 and the invention name "a valve" filed with the China Patent Office on April 16, 2021, and the application number 202120790140.9 and the invention name "a valve" The priority of the Chinese patent application of , the entire contents of which are incorporated by reference in this application.

technical field

The invention relates to the technical field of liquefied petroleum gas storage, in particular to a valve.

Background technique

Liquefied petroleum gas is a flammable substance. When the content in the air reaches a certain concentration range, it will explode in case of an open flame. In preventing the leakage of liquefied petroleum gas, the liquefied petroleum gas valve plays a vital role.

As shown in FIG. 1, the valve of the liquefied petroleum gas cylinder of the prior art includes a valve body 01, the valve body 01 is communicated axially, and the lower end forms a first valve port A, the side wall is provided with a second valve port B, and also includes a valve body 01. The valve body 02 movably installed inside the valve body 01 has a rubber sealing ring 03 between the valve body 02 and the inner cavity of the valve body 01 to realize the sealing along the axial direction of the valve body 01 .

In the process of opening or closing the valve, that is, the valve body 02 moves up and down along the axis of the valve body 01, the rubber sealing ring 03 and the inner side wall of the valve body 01 will rub against each other, which is easy to cause the wear of the rubber sealing ring 03, and, Liquefied petroleum gas is often mixed with highly corrosive dimethyl ether, which will affect the service life of the sealing ring. At the same time, impurities in the liquefied gas will also accumulate here, affecting the sealing reliability.

Usually the life of the rubber sealing ring 03 is about 5 years, the design life of the LPG cylinder is 8 years, and the design life of the new LPG fiber bottle is 12 years, that is, the original valve does not match the life of the LPG cylinder.

Therefore, it is necessary to design a valve with long life and high sealing reliability.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a valve.

The valve includes a valve body, the valve body is provided with a through hole extending in the axial direction, a first valve port is formed at the lower end of the through hole, and a second valve port communicated with the through hole is provided on the inner wall of the valve body , the valve body side wall is provided with a first sealing surface on the upper side of the second valve port, and also includes a first sealing member fixedly supported on the first sealing surface, and a bellows seal installed on the inner upper end of the valve body The bellows seal includes an inner core and a bellows sleeved on the inner core, the inner core can move in the axial direction of the valve body to seal or open the first valve port, the bellows The axial lower end is fixedly connected with the inner core, and the upper end is sealedly connected with the first sealing member.

Optionally, the cap nut installed at the opening of the upper end of the valve body is threadedly connected with the valve stem, the lower end of the valve stem is connected with the inner core and can be rotated relatively, and the upper end is fixedly connected with the handwheel.

Optionally, a limiting step is provided on the peripheral wall of the valve stem to limit the maximum upward displacement of the inner core.

Optionally, the upper end of the bellows is provided with an outwardly extending flange, and further includes an annular pressing member for pressing the flange and the first sealing member against the first sealing member. Sealing surface.

Optionally, the side wall of the valve body is further provided with a second sealing surface on the lower side of the first sealing surface, the bottom wall of the inner core is provided with an annular installation groove at a predetermined position, and further includes a second sealing member, The second sealing member is installed inside the annular installation groove, the inner core moves along the axial direction of the valve body, and the second sealing member can compress or loosen the second sealing surface to seal or loosen the second sealing member. Open the first valve port.

Optionally, the materials of the first sealing member and the second sealing member are both polytetrafluoroethylene.

Optionally, the second sealing surface is provided with an annular groove or an annular protrusion at a position in contact with the second sealing member.

Optionally, in the axial section of the valve body, the shape of the annular groove is a sharp angle or an arc.

Optionally, the bottom wall of the annular installation groove is further provided with at least one groove.

Owing to adopting the above-mentioned technical scheme, the beneficial effects of the present invention are:

The valve improves the structure of the valve body and the valve body. Specifically, a first sealing surface is added on the upper end of the second valve port, and the first sealing member is fixedly supported on the first sealing surface; at the same time, the bellows sealing member is inside A bellows is added to the outer circumference of the core. Due to the elasticity of the bellows, during the axial movement of the inner core along the valve body, the fixed end of the bellows and the inner core can expand and contract in the axial direction with the movement of the inner core, while the other end is always It is sealingly connected with the first sealing member, fixedly supported on the first sealing surface, and plays a sealing role, so that when the first valve port is opened, the liquefied petroleum gas can only be discharged through the second valve port.

It can be seen from the above that the first sealing member adopts static sealing, which is more reliable in sealing and has a longer service life.

Description of drawings

Fig. 1 is the structural representation of prior art valve;

2 is a schematic structural diagram of a specific embodiment of the valve provided by the present invention;

Fig. 3 is a partial schematic diagram of the valve of Fig. 2;

4 is a schematic structural diagram of the first embodiment of the annular groove provided on the second sealing surface;

5 is a schematic structural diagram of the second embodiment of the annular groove provided on the second sealing surface;

6 is a schematic structural diagram of a third embodiment of the annular groove provided on the second sealing surface;

Fig. 7 is the structural representation of the first embodiment of the bellows seal in the valve of Fig. 2;

8 is a schematic structural diagram of the second embodiment of the bellows seal in the valve of FIG. 2;

Wherein, the reference numerals in FIG. 1 are described as follows:

01-valve body; 02-valve body; 03-rubber sealing ring; A-first valve port; B-second valve port;

Wherein, the reference numerals in Fig. 2 to Fig. 8 are described as follows:

1-valve body; 2-first seal; 3-inner core; 4-bellows; 5-valve stem; 6-handwheel; 7-cap nut; 8-pressing piece; 9-limiting step; 010-Second seal;

I-first valve port; O-second valve port; a-annular groove; b-groove.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The terms "first" and "second" mentioned in this document are only for the convenience of describing two or more structures or components with the same or similar structures and/or functions, and do not indicate any order and/or importance. some kind of special restriction.

As shown in FIG. 2, the present invention provides a valve, comprising a valve body 1, the valve body 1 is provided with a through hole extending in the axial direction, the lower end of the through hole forms a first valve port I, and the inner wall of the valve body 1 is provided with a through hole The second valve port O communicated;

The inner side wall of the valve body 1 is provided with a first sealing surface on the upper side of the second valve port O, and also includes a first sealing member 2 fixedly supported on the first sealing surface, and a bellows sealing member installed on the inner upper end of the valve body 1 , the bellows seal includes an inner core 3, and a bellows 4 that sets the inner core 3. The inner core 3 can move along the axial direction of the valve body 1 to seal or open the first valve port I, and the axial lower end of the bellows 4 is connected to The inner core 3 is fixedly connected, and the upper end is sealed with the first sealing member 2 .

The valve improves the structure of the valve body and the valve body. Specifically, a first sealing surface is added to the upper end of the second valve port O, and the first sealing member 2 is fixedly supported on the first sealing surface; at the same time, the bellows sealing member A bellows 4 is added on the outer circumference of the inner core 3. Since the bellows 4 has elasticity, during the axial movement of the inner core 3 along the valve body 1, the fixed lower end of the bellows 4 and the inner core 3 can follow the inner core 3. The movement is axially stretched, and the upper end is always sealed with the first seal 2, fixedly supported on the first sealing surface, and plays a sealing role, so that when the first valve port 1 is opened, the liquefied petroleum gas can only pass through the second seal. Valve port O is discharged.

It can be seen from the above that the first sealing member 2 adopts static sealing, which is more reliable in sealing and has a longer service life.

As shown in Figures 7 and 8, in this embodiment, the corrugated pipe 4 is made of stainless steel, which is fixedly connected to the inner core 3 by welding, and its folds can be arc-shaped or sharp-angled; the structure of the corrugated pipe 4 is not Not limited to the above form, the material can also be a non-metallic material with elasticity.

In this embodiment, the valve also includes a cap nut 7 installed at the opening of the upper end of the valve body 1. The cap nut 7 is threadedly connected to the valve stem 5, and the lower end of the valve stem 5 is connected to the inner core 3 and can be rotated relatively. The handwheel 6 is fixedly connected, and the valve stem 5 is rotated through the handwheel 6 to push the inner core 3 to move up and down, so as to realize the opening and closing of the valve.

Please refer to FIG. 3 , the peripheral wall of the valve stem 5 is further provided with a limiting step 9 to limit the maximum upward displacement of the inner core 3 and prevent the bellows 4 from being over-compressed. Please continue to refer to FIG. 2 , in this embodiment, the upper end of the bellows 4 is provided with a flange extending outward, and also includes an annular pressing member 8 for pressing the flange and the first sealing member 2 on the first sealing surface.

Please continue to refer to FIG. 2, the inner side wall of the valve body 1 is further provided with a second sealing surface on the lower side of the first sealing surface, the bottom wall of the inner core 3 is provided with an annular installation groove at a predetermined position, and also includes a second sealing member 010, the first The second sealing member 010 is installed inside the annular installation groove, the inner core 3 moves along the axial direction of the valve body 1, and the second sealing member 010 can compress or loosen the second sealing surface to seal or open the first valve port 1.

The annular installation groove is used to install the second seal 010, therefore, its shape is not limited, and the side wall of the annular installation groove may be a plane surface or an arc surface.

The materials of the first sealing member 2 and the second sealing member 010 are both corrosion-resistant polytetrafluoroethylene, which can improve the service life and sealing reliability of the valve of the present invention. The material of the seal includes, but is not limited to, Teflon.

Please continue to refer to FIGS. 4 to 6. FIG. 4 is a schematic structural diagram of the first embodiment of the second sealing surface with annular grooves; FIG. 5 is a structural schematic diagram of the second embodiment of the second sealing surface with annular grooves; FIG. 6 is a schematic structural diagram of the third embodiment of the annular groove provided on the second sealing surface.

In this embodiment, the second sealing surface is further provided with an annular groove a at the part that is in contact with the second sealing member 010 to realize double-ring sealing. The width of the annular groove a is not limited and can be smaller than the second sealing surface and the second sealing surface. The width of the contact area of the sealing member 010 is equal to the width of the contact area between the second sealing surface and the second sealing member 010; the specific shape of the annular groove a is also not limited, and can be an arc shape, or a sharp angle shape, etc.; of course, In practical applications, it is also feasible to provide annular protrusions.

Further, at least one groove b is also provided on the bottom wall of the annular mounting groove on the bottom wall of the inner core 3 for mounting the second sealing member 010 .

The second sealing member 010 is press-fitted inside the annular installation groove. At the same time, since the sealing member will creep after years of use, in order to prevent the second sealing member 010 from falling off after long-term use, at the bottom wall of the annular installation groove, at least For a groove b, the second sealing member 010 will slowly enter the reserved groove b after being deformed, and the sealing can still be well achieved.

In this embodiment, the bottom wall of the annular installation groove is provided with two grooves b. In practical application, the number and shape of the grooves b are not limited.

In order to prevent the second sealing member 010 from falling off, an inwardly folded limit portion may also be provided at the open end of the annular installation groove to limit the second sealing member 010 .

The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A valve, comprising a valve body (1), the valve body (1) is provided with a through hole extending in the axial direction, the lower end of the through hole forms a first valve port (I), and the inner wall of the valve body (1) A second valve port (O) communicating with the through hole is provided, characterized in that,

The inner side wall of the valve body (1) is provided with a first sealing surface on the upper side of the second valve port (O), and further comprises a first sealing member (2) fixedly supported on the first sealing surface, and A bellows seal installed on the inner upper end of the valve body (1), the bellows seal includes an inner core (3), and a bellows (4) sleeved on the inner core (3), the inner core (3) (3) Can move along the axial direction of the valve body (1) to seal or open the first valve port (I), and the axial lower end of the bellows (4) is fixed to the inner core (3) connected, and the upper end is sealingly connected with the first sealing member (2).
The valve according to claim 1, characterized in that the cap nut (7) installed at the opening of the upper end of the valve body (1) is threadedly connected with the valve stem (5), and the lower end of the valve stem (5) is connected to the valve stem (5). The inner core (3) is connected and can rotate relatively, and the upper end is fixedly connected with the hand wheel (6).
The valve according to claim 2, characterized in that a limiting step (9) is provided on the peripheral wall of the valve stem (5) to limit the maximum upward displacement of the inner core (3).
The valve according to claim 1, characterized in that the upper end of the bellows (4) is provided with an outwardly extending flange, and further comprises an annular pressing member (8) for pressing the flange and the first sealing member (2) is pressed against the first sealing surface.
The valve according to any one of claims 1-4, characterized in that, the inner side wall of the valve body (1) is further provided with a second sealing surface on the lower side of the first sealing surface, and the inner core (3) ) is provided with an annular installation groove at a predetermined position on the bottom wall of the With the axial movement of the valve body (1), the second sealing member (010) can press or loosen the second sealing surface, so as to seal or open the first valve port (I).
The valve according to claim 5, characterized in that, the materials of the first sealing member (2) and the second sealing member (010) are both polytetrafluoroethylene.
The valve according to claim 5, characterized in that, the second sealing surface is provided with an annular groove (a) or an annular protrusion at a position in contact with the second sealing member (010).
The valve according to claim 7, characterized in that, in the axial section of the valve body (1), the shape of the annular groove (a) is a sharp angle or an arc.
The valve according to claim 5, characterized in that, the bottom wall of the annular installation groove is further provided with at least one groove (b).