Pressure maintaining gas cylinder valve

Abstract

The utility model discloses a pressure maintaining gas cylinder valve, and mainly relates to the technical field of valves. Comprising a valve body, a longitudinal valve cavity and a transverse ventilation channel are formed in the valve body, a pressure maintaining device is arranged in the ventilation channel and comprises a spring seat, a valve rod is arranged in the valve cavity, a valve element is arranged at the bottom of the valve rod, an external thread is arranged on the outer wall of the top of the valve element, and the spring seat is arranged on the valve rod. The bottom of the valve rod is provided with a threaded hole matched with an external thread on the valve element, the spring seat is provided with a guide hole matched with the valve element, the guide hole vertically penetrates through the spring seat, the lower portion of the valve element is provided with a guide portion matched with the guide hole, and the valve element is arranged on the valve rod through matching of the guide portion and the guide hole. The valve core can only move up and down and cannot rotate; compared with the prior art, the size of the valve body is reduced, the weight is reduced, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pressure-maintaining gas cylinder valve. Background Art

[0002] At present, most of the valve core driving mechanisms of the existing pressure-maintaining gas cylinder valves adopt thread drive. For example, the existing patents with publication numbers: CN214946629U and CN217234419U both have external threads on the outer wall of the top of the valve core, and corresponding internal threads in the valve cavity of the valve body. A transmission mechanism is provided between the valve stem and the valve core (generally in the form of an inner and outer connection). The valve stem is rotated to drive the valve core to rotate, and the valve core is driven to move along the axis of the valve stem through the threaded cooperation between the valve core and the valve cavity. Since it is necessary to process the external threads in the valve cavity, a certain space must be reserved in the longitudinal direction of the valve body, resulting in a larger volume of the valve body and a larger total amount. At the same time, the production cost will be increased accordingly when the internal threads are processed inside the valve body. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art and provide a pressure-maintaining gas cylinder valve which is easy to manufacture and reduces the volume of the valve body, reduces the weight and saves the cost compared with the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical solutions:

[0005] A pressure-maintaining gas cylinder valve comprises a valve body, wherein a longitudinal valve cavity and a transverse ventilation channel are provided in the valve body, a pressure-maintaining device is provided in the ventilation channel, and the pressure-maintaining device comprises a spring seat, a valve stem is provided in the valve cavity, a valve core is provided at the bottom of the valve stem, an external thread is provided on the outer wall of the top of the valve core, a threaded hole adapted to the external thread on the valve core is provided at the bottom of the valve stem, a guide hole adapted to the valve core is provided on the spring seat, the guide hole vertically penetrates the spring seat, a guide portion adapted to the guide hole is provided at the lower part of the valve core, and the guide portion cooperates with the guide hole so that the valve core can only move up and down but cannot rotate.

[0006] Preferably, the guide hole is a square hole, and the guide portion is a column with a square cross section matching the square hole.

[0007] Preferably, the guide portion is a guide block arranged on the outer wall of the valve core, and the guide hole comprises a through hole adapted to the valve core and a guide groove arranged on the inner wall of the through hole and adapted to the guide block.

[0008] Preferably, a hand wheel is provided at one end of the valve stem extending upward from the valve body, the valve stem is mounted on the valve body via a pressure cap, and a sealing assembly is provided between the valve stem and the pressure cap.

[0009] Preferably, the valve stem is stepped, the bottom outer diameter of the valve stem is larger than the upper outer diameter, a stepped hole adapted to the valve stem is provided in the pressure cap, and a friction-reducing pad is provided between the valve stem and the top wall of the hole at the lower end of the stepped hole.

[0010] Preferably, an air inlet hole communicating with the valve cavity is provided at the bottom of the valve body, and the valve core is used to close the air inlet hole.

[0011] Preferably, a pressure cover detachably connected to the valve body is provided at one end of the ventilation channel, and an air outlet is provided at the other end.

[0012] Preferably, a mounting hole is provided at one end of the spring seat close to the air outlet, and a spring and a valve core are sequentially provided in the mounting hole from the inside to the outside, and the valve core cooperates with the valve seat in the air outlet.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model is an improvement on the existing pressure-maintaining valve, and adopts the method of matching the valve stem and the valve core thread to drive the movement of the valve core. Compared with the existing technology, it can reduce the processing amount in the valve body, reduce the volume of the valve body, reduce the weight of the valve body, and save costs; at the same time, processing the thread on the valve stem can also reduce the production cost compared with processing the thread in the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 AA section view;

[0017] Figure 3 It is a schematic diagram of the matching structure of the valve core and the spring seat.

[0018] Numbers in the attached drawings: 1, valve body; 2, valve cavity; 3, ventilation channel; 4, spring seat; 41, guide hole; 42, through hole; 43, guide groove; 44, mounting hole; 45, spring; 46, valve core; 5, valve stem; 51, threaded hole; 6, valve core; 61, guide part; 62, guide block; 7, hand wheel; 8, pressure cap; 9, friction reducing pad; 10, air inlet; 11, pressure cover; 12, air outlet; DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0020] Example: As attached Figure 1-3 As shown, the utility model is a pressure-maintaining gas cylinder valve, which mainly improves the driving mechanism of the valve core 6 on the basis of the existing pressure-maintaining valve, including a valve body 1, wherein the valve body 1 is provided with a longitudinal valve cavity 2 and a transverse ventilation channel 3, wherein the ventilation channel 3 is provided with a pressure-maintaining device, wherein the pressure-maintaining device includes a spring seat 4, wherein the valve cavity 2 is provided with a valve stem 5, wherein the bottom of the valve stem 5 is provided with a valve core 6, except for the connection structure between the valve stem 5 and the valve core 6, the other structures of the utility model can refer to the pressure-maintaining gas cylinder valve in the prior art, such as the valve structure disclosed in the existing patents with publication numbers: CN214946629U and CN217234419U.

[0021] An external thread is provided on the outer wall of the top of the valve core 6, and a threaded hole 51 adapted to the external thread on the valve core 6 is provided at the bottom of the valve stem 5. The top of the valve core 6 is screwed into the threaded hole 51. A guide hole 41 adapted to the valve core 6 is provided on the spring seat 4. The guide hole 41 vertically penetrates the spring seat 4. A guide portion 61 adapted to the guide hole 41 is provided at the lower part of the valve core 6. Through the cooperation of the guide portion 61 and the guide hole 41, the valve core 6 can only move up and down but cannot rotate. When the valve stem 5 is rotated, since the valve core 6 can only move up and down but cannot rotate, the valve core 6 moves up or down under the action of the thread pair.

[0022] Preferably, as attached Figure 2 As shown, the guide hole 41 is a square hole, the guide portion 61 is a column with a square cross section that matches the square hole, and the valve core 6 is composed of, from top to bottom, an external threaded portion that matches the threaded hole 51, a columnar guide portion 61 with a square cross section, and a sealing portion that matches the valve seat at the top of the air inlet hole 10, and a sealing member is provided at the sealing portion.

[0023] Preferably, as attached Figure 3 As shown, the guide portion 61 can also be a guide block 62 arranged on the outer wall of the valve core 6, the cross-section of the guide block 62 can be semicircular, the valve core 6 is a rotating body, and the guide hole 41 includes a through hole 42 adapted to the valve core 6 and a guide groove 43 arranged on the inner wall of the through hole 42 and adapted to the guide block 62. Through the cooperation between the guide block 62 and the guide groove 43, the valve core 6 can only move up and down but cannot rotate.

[0024] Preferably, a handwheel 7 is provided at one end of the valve stem 5 extending upward from the valve body 1, and the handwheel 7 is locked on the valve stem 5 by a nut. The valve stem 5 is installed on the valve body 1 through a pressure cap 8, and the pressure cap 8 and the valve body 1 are threadedly connected, and a sealing assembly is provided between the valve stem 5 and the pressure cap 8.

[0025] Preferably, the valve stem 5 is stepped, and the valve stem 5 is respectively a first column and a second column from bottom to top, and the outer diameter of the first column is larger than the outer diameter of the second column, a stepped hole adapted to the valve stem 5 is provided in the pressure cap 8, and a friction-reducing pad 9 is provided between the top end of the first column and the top wall of the hole at the bottom end of the stepped hole.

[0026] Preferably, the bottom of the valve body 1 is provided with an air inlet hole 10 connected to the valve cavity 2, and the top of the air inlet hole 10 is provided with a valve seat adapted to the valve core 6. The valve core 6 is used to close the air inlet hole 10, and the closing or opening of the air inlet hole 10 is achieved by the fitting or separation of the valve core 6 and the valve seat.

[0027] Preferably, a gland 11 detachably connected to the valve body 1 is provided at one end of the ventilation channel 3 , and an air outlet 12 is provided at the other end. A conical hole is provided in front of the air outlet 12 to form a valve seat adapted to the valve core 46 .

[0028] Preferably, a mounting hole 44 is provided at one end of the spring seat 4 close to the air outlet 12, and a spring 45 and a valve core 46 are provided in the mounting hole 44 from the inside to the outside. The valve core 46 cooperates with the valve seat in the air outlet 12, and the valve core 46 is slidably connected to the mounting hole 44.

Claims

1. A pressure-maintaining gas cylinder valve, comprising a valve body (1), wherein a longitudinal valve cavity (2) and a transverse ventilation channel (3) are provided in the valve body (1), a pressure-maintaining device is provided in the ventilation channel (3), the pressure-maintaining device comprises a spring seat (4), a valve stem (5) is provided in the valve cavity (2), a valve core (6) is provided at the bottom of the valve stem (5), and the characteristics are: The outer wall at the top of the valve core (6) is provided with an external thread, the bottom of the valve stem (5) is provided with a threaded hole (51) adapted to the external thread on the valve core (6), the spring seat (4) is provided with a guide hole (41) adapted to the valve core (6), the guide hole (41) vertically penetrates the spring seat (4), the lower part of the valve core (6) is provided with a guide portion (61) adapted to the guide hole (41), and through the cooperation between the guide portion (61) and the guide hole (41), the valve core (6) can only move up and down but cannot rotate.

2. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The guide hole (41) is a square hole, and the guide portion (61) is a column with a square cross section that matches the square hole.

3. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The guide portion (61) is a guide block (62) arranged on the outer wall of the valve core (6), and the guide hole (41) comprises a through hole (42) adapted to the valve core (6) and a guide groove (43) arranged on the inner wall of the through hole (42) and adapted to the guide block (62).

4. A pressure-maintaining gas cylinder valve according to claim 1, characterized in that: A hand wheel (7) is provided at one end of the valve stem (5) extending upward from the valve body (1); the valve stem (5) is mounted on the valve body (1) via a pressure cap (8), and a sealing assembly is provided between the valve stem (5) and the pressure cap (8).

5. A pressure-maintaining gas cylinder valve according to claim 4, characterized in that: The valve stem (5) is in a stepped shape, the outer diameter of the bottom of the valve stem (5) is larger than the outer diameter of the top, a stepped hole adapted to the valve stem (5) is provided in the pressure cap (8), and a friction reducing pad (9) is provided between the valve stem (5) and the top wall of the hole at the bottom end of the stepped hole.

6. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: The bottom of the valve body (1) is provided with an air inlet hole (10) which is in communication with the valve cavity (2), and the valve core (6) is used to close the air inlet hole (10).

7. The pressure-maintaining gas cylinder valve according to claim 1, characterized in that: One end of the ventilation channel (3) is provided with a pressure cover (11) detachably connected to the valve body (1), and the other end is provided with an air outlet (12).

8. A pressure-maintaining gas cylinder valve according to claim 7, characterized in that: A mounting hole (44) is provided at one end of the spring seat (4) close to the air outlet (12), and a spring (45) and a valve core (46) are arranged in sequence from the inside to the outside of the mounting hole (44), and the valve core (46) cooperates with the valve seat in the air outlet (12).

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