Cylinder valve

Abstract

The utility model discloses a gas cylinder valve which comprises a valve body, a hand wheel assembly and a valve element assembly. The valve body is further provided with an air inlet channel and an air outlet channel, the valve element assembly comprises a valve element, a lower valve rod and a valve seat, and the valve seat is connected with the valve element in a buckled mode. The valve element assembly is further provided with an external leakage sealing structure. The external leakage sealing structure comprises a sealing ring, a diaphragm and a welding sealing connector. According to the diaphragm type gas cylinder valve, the valve seat and the valve element can be quickly mounted or dismounted through the buckling connection, the mounting steps are reduced, the production process is simplified, the production cost is reduced, meanwhile, the production efficiency of the gas cylinder valve is improved, and the batch production requirement of an existing diaphragm type gas cylinder valve is met; the external leakage sealing structure is arranged for achieving multiple sealing, the sealing performance and reliability of the external leakage sealing structure are improved, the external leakage prevention performance is improved, the use stability and safety are improved, the service life is prolonged, and the use requirements of an existing gas cylinder valve are met.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm gas cylinder valves, and particularly relates to a gas cylinder valve. Background Art

[0002] In the application of diaphragm gas cylinder valves in special gases such as electronic special gases, the media used often have high toxicity and strong corrosiveness, and higher requirements are imposed on internal and external leakage sealing. To improve safety, the external seal of existing diaphragm gas cylinder valves usually adopts a corrosion-resistant metal diaphragm seal, and the internal seal thereof adopts a soft seal material.

[0003] The internal seal structure of the existing diaphragm gas cylinder valve is to fix the valve seat of the internal seal on the valve core by means of circumferential welding; in the external seal processing, the external leakage metal diaphragm is usually welded and connected to the valve core by means of welding seal and pre-tightening force seal; the diaphragm gas cylinder valve with the above conventional structure has the following problems: 1. The valve seat and the valve core of the existing gas cylinder valve are fixed together by welding, which is non-detachable. The welding process is complex and has high requirements for the welding machine process. While increasing the production cost, the production efficiency of the gas cylinder valve is reduced, and the batch production demand of the existing diaphragm gas cylinder valve cannot be met; 2. The sealing performance and reliability of the external seal of the existing gas cylinder valve are poor. After long-term use, it may be offset or cracked, resulting in leakage, low safety performance, and short service life, which cannot meet the use requirements of the existing gas cylinder valve. Summary of the Utility Model

[0004] The present utility model aims at the deficiencies of the current technology and provides a gas cylinder valve, aiming to solve the technical problems of complex internal seal installation method, high cost, low external seal performance and reliability in the existing technology.

[0005] The technical solution adopted by the present utility model to achieve the above object is as follows:

[0006] A gas cylinder valve includes a valve body and a handwheel assembly. The valve body is provided with a cavity, the handwheel assembly is arranged on the cavity, and a valve core assembly is arranged between the handwheel assembly and the cavity; the valve body is further provided with an air inlet channel and an air outlet channel, and both the air inlet channel and the air outlet channel are connected and communicated with the cavity; a valve seat is arranged at the bottom of the valve core assembly, and a clamping connection is provided between the valve seat and the valve core assembly; the valve core assembly is further provided with an external leakage seal structure.

[0007] For further improvement, the cavity sequentially includes a first moving cavity, a second moving cavity and a third moving cavity from top to bottom; the third moving cavity is connected and communicated with the air inlet channel and the air outlet channel; the valve core assembly includes a lower valve rod and a valve core, the valve core is arranged below the lower valve rod, the external leakage seal structure is arranged between the valve core and the lower valve rod, and the valve core is arranged in the third moving cavity.

[0008] For further improvement, the lower valve stem is provided with a threaded hole, the valve core is provided with a screw rod, and the screw rod is threadedly connected to the threaded hole; the lower valve stem is provided with a groove, and the external leakage sealing structure includes a sealing ring and a diaphragm. The diaphragm is arranged on the valve core, and the sealing ring is arranged on the diaphragm and in the groove.

[0009] For further improvement, the diaphragm and the valve core are welded and sealed; the diaphragm is provided with a pre-tightening force sealing structure, and the pre-tightening force sealing structure is arranged between the second moving cavity and the third moving cavity;

[0010] The pre-tightening force sealing structure includes a first elastic arc-shaped protrusion and a second elastic arc-shaped protrusion.

[0011] For further improvement, the handwheel assembly includes a valve cover, an upper valve stem and a handwheel. The valve cover is arranged in the first moving cavity; the valve cover is provided with a first sliding cavity, and the upper valve stem is connected to the lower valve stem and arranged in the first sliding cavity; there is a steel ball between the upper valve stem and the lower valve stem.

[0012] For further improvement, the valve cover is provided with a first sealing ring, and the first sealing ring fits with the inner wall of the first moving cavity; the upper valve stem is provided with a second sealing ring, and the second sealing ring fits with the top inner wall of the first sliding cavity; the lower valve stem is provided with a third sealing ring, and the third sealing ring fits with the lower inner wall of the first sliding cavity.

[0013] For further improvement, the detaining connection includes an annular buckle groove and an annular buckle block. The annular buckle groove is arranged at the bottom of the valve core, and the annular buckle block is arranged on the valve seat.

[0014] For further improvement, the upper valve stem is provided with a stepped connection part, the handwheel is arranged on the stepped connection part, and the handwheel and the stepped connection part are threadedly connected.

[0015] For further improvement, there are threaded connection structures between the valve cover and the first moving cavity and between the upper valve stem and the first sliding cavity.

[0016] For further improvement, a gasket is arranged between the diaphragm and the bottom of the valve cover; the diaphragm is a metal anti-corrosion elastic diaphragm.

[0017] Compared with the prior art, one or more of the above technical solutions in the gas cylinder valve provided by the embodiment of the present invention have at least one of the following technical effects:

[0018] 1. The utility model realizes quick installation or disassembly between the valve seat and the valve core by providing a clamping connection therebetween. The clamping connection includes an annular clamping groove and an annular clamping block. The annular clamping groove is arranged at the bottom of the valve core, and the annular clamping block is arranged on the valve seat. The clamping connection realizes quick installation or disassembly between the valve seat and the valve core, reduces the installation steps, simplifies the production process, reduces the production cost, improves the production efficiency of the gas cylinder valve, and meets the mass production requirements of the existing diaphragm type gas cylinder valves.

[0019] 2. By providing an external leakage sealing structure composed of a diaphragm, a welded sealing connection, a sealing ring and a pre-tightening force sealing structure to achieve multiple seals, the sealing performance and reliability of the external leakage sealing structure are improved, the external leakage prevention performance is improved, the use stability and safety are improved, the service life is extended, and the use requirements of the existing gas cylinder valves are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of the overall structure of the gas cylinder valve of this embodiment;

[0022] Figure 2 is a schematic diagram of the structure of the valve core assembly of this embodiment;

[0023] Figure 3 is Figure 2 an enlarged schematic diagram of A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following is only a preferred embodiment of the present utility model, and does not limit the protection scope of the present invention accordingly.

[0025] Embodiment, see the attached Figures 1 to 3, a gas cylinder valve 1 includes a valve body 2 and a handwheel assembly 3. The valve body 2 is provided with a cavity 20, the handwheel assembly 3 is arranged on the cavity 20, and a valve core assembly 4 is arranged between the handwheel assembly 3 and the cavity 20; the valve body 2 is further provided with an air inlet passage 21 and an air outlet passage 22, and both the air inlet passage 21 and the air outlet passage 22 are connected and communicated with the cavity 20; a valve seat 40 is arranged at the bottom of the valve core assembly 4, and a clamping connection 5 is provided between the valve seat 40 and the valve core assembly 4. The clamping connection 5 includes an annular clamping groove and an annular clamping block. The annular clamping groove is arranged at the bottom of the valve core 42, and the annular clamping block is arranged on the valve seat 40; the clamping connection 5 is used to reduce steps and greatly simplify the production process; the valve core assembly 4 is further provided with an external leakage sealing structure 6.

[0026] The cavity 20 sequentially includes a first movable cavity 200, a second movable cavity 201, and a third movable cavity 202 from top to bottom. The third movable cavity 202 is connected and communicated with the air inlet passage 21 and the air outlet passage 22; the valve core assembly 4 includes a lower valve rod 41 and a valve core 42. The valve core 42 is arranged below the lower valve rod 41. The external leakage sealing structure 6 is arranged between the valve core 42 and the lower valve rod 41, and the valve core 42 is arranged in the third movable cavity 202.

[0027] The lower valve rod 41 is provided with a threaded hole, the valve core 42 is provided with a screw rod, and the screw rod is threadedly connected with the threaded hole; the lower valve rod 41 is provided with a groove. The external leakage sealing structure 6 includes a sealing ring 60 and a diaphragm 61. The diaphragm 61 is arranged on the valve core 42, and the sealing ring 60 is arranged on the diaphragm 61 and arranged in the groove; the diaphragm 61 is a metal corrosion-resistant elastic diaphragm.

[0028] A welded sealing connection 62 is provided between the diaphragm 61 and the valve core 42; the diaphragm 61 is provided with a pre-tightening force sealing structure 9. The pre-tightening force sealing structure 9 is arranged between the second movable cavity 201 and the third movable cavity 202; the pre-tightening force sealing structure 9 includes a first elastic arc-shaped protrusion 90 and a second elastic arc-shaped protrusion 91; a washer 10 is arranged between the diaphragm 61 and the bottom of the valve cover 30. The diaphragm 61, the welded sealing connection 62, the sealing ring 60, and the pre-tightening force sealing structure 9 are used to achieve multiple seals, thereby improving the reliability of the external leakage sealing structure 6, improving the anti-external leakage performance, and improving the use stability and safety.

[0029] The handwheel assembly 3 includes a valve cover 30, an upper valve rod 31, and a handwheel 32. The valve cover 30 is arranged in the first movable cavity 200; the valve cover 30 is provided with a first sliding cavity 300. The upper valve rod 31 is connected with the lower valve rod 41 and arranged in the first sliding cavity 300; a steel ball 33 is arranged between the upper valve rod 31 and the lower valve rod 41.

[0030] The valve cover 30 is provided with a first sealing ring 301, and the first sealing ring 301 is attached to the inner wall of the first movable cavity 200; the upper valve stem 31 is provided with a second sealing ring 311, and the second sealing ring 311 is attached to the top inner wall of the first sliding cavity 300; the lower valve stem 41 is provided with a third sealing ring 411, and the third sealing ring 411 is attached to the lower inner wall of the first sliding cavity 300. The first sealing ring 301, the second sealing ring 311 and the third sealing ring 411 are used to ensure the connection tightness between various components, thereby preventing the leakage of the medium and improving safety.

[0031] The upper valve stem 31 is provided with a stepped connection portion, and both the stepped connection portion and the handwheel 32 are provided with mating planes. The handwheel 32 is arranged on the stepped connection portion, and the handwheel 32 is threadedly connected to the stepped connection portion. The handwheel 32 is used to operate to open or close the valve core 42.

[0032] A threaded connection structure is provided between the valve cover 30 and the first movable cavity 200, and between the upper valve stem 31 and the first sliding cavity 300. The threaded connection structure includes an internal thread and an external thread, and the threaded connection structure is respectively used for installation, disassembly, or controlling opening and closing.

[0033] In the present utility model, a clamping connection is provided between the valve seat and the valve core. The clamping connection includes an annular clamping groove and an annular clamping block. The annular clamping groove is arranged at the bottom of the valve core, and the annular clamping block is arranged on the valve seat; the clamping connection realizes the rapid installation or disassembly between the valve seat and the valve core, reduces the installation steps, simplifies the production process, reduces the production cost, and improves the production efficiency of the gas cylinder valve while meeting the batch production requirements of the existing diaphragm type gas cylinder valve; by providing an external leakage sealing structure composed of a diaphragm, a welded seal connection, a sealing ring, and a pre-tightening force sealing structure to achieve multiple seals, improve the tightness and reliability of the external leakage sealing structure, improve the anti-external leakage performance, improve the use stability and safety, extend the service life, and meet the use requirements of the existing gas cylinder valves.

[0034] The present utility model is not limited to the above embodiments. Other gas cylinder valves obtained by adopting the same or similar structures or devices as those of the above embodiments of the present utility model are all within the protection scope of the present utility model.

Claims

1. A gas cylinder valve, characterized in that: The gas cylinder valve includes a valve body and a handwheel assembly. The valve body is provided with a cavity, the handwheel assembly is arranged on the cavity, and a valve core assembly is arranged between the handwheel assembly and the cavity. The valve body is further provided with an air inlet channel and an air outlet channel, and both the air inlet channel and the air outlet channel are connected and communicated with the cavity. A valve seat is arranged at the bottom of the valve core assembly, and the valve seat and the valve core assembly are in a clamping connection. The valve core assembly is further provided with an external leakage sealing structure.

2. The gas cylinder valve according to claim 1, wherein: The cavity sequentially includes a first movable cavity, a second movable cavity and a third movable cavity from top to bottom. The third movable cavity is connected and communicated with the air inlet channel and the air outlet channel. The valve core assembly includes a lower valve stem and a valve core. The valve core is arranged below the lower valve stem. The external leakage sealing structure is arranged between the valve core and the lower valve stem, and the valve core is arranged in the third movable cavity.

3. The gas cylinder valve according to claim 2, characterized in that: The lower valve stem is provided with a threaded hole, the valve core is provided with a screw rod, and the screw rod is in threaded connection with the threaded hole. The lower valve stem is provided with a groove. The external leakage sealing structure includes a sealing ring and a diaphragm. The diaphragm is arranged on the valve core, and the sealing ring is arranged on the diaphragm and in the groove.

4. The gas cylinder valve according to claim 3, characterized in that: The diaphragm and the valve core are in a welded and sealed connection. The diaphragm is provided with a pre-tightening force sealing structure, and the pre-tightening force sealing structure is arranged between the second movable cavity and the third movable cavity. The pre-tightening force sealing structure includes a first elastic arc-shaped protrusion and a second elastic arc-shaped protrusion.

5. The gas cylinder valve according to claim 4, characterized in that: The handwheel assembly includes a valve cover, an upper valve stem and a handwheel. The valve cover is arranged in the first movable cavity. The valve cover is provided with a first sliding cavity. The upper valve stem is connected to the lower valve stem and arranged in the first sliding cavity. A steel ball is arranged between the upper valve stem and the lower valve stem.

6. The gas cylinder valve according to claim 5, characterized in that: The valve cover is provided with a first sealing ring, and the first sealing ring is in contact with the inner wall of the first movable cavity. The upper valve stem is provided with a second sealing ring, and the second sealing ring is in contact with the top inner wall of the first sliding cavity. The lower valve stem is provided with a third sealing ring, and the third sealing ring is in contact with the lower inner wall of the first sliding cavity.

7. The gas cylinder valve according to claim 6, wherein: The clamping connection includes an annular clamping groove and an annular clamping block. The annular clamping groove is arranged at the bottom of the valve core, and the annular clamping block is arranged on the valve seat.

8. The gas cylinder valve according to claim 7, characterized in that: The upper valve stem is provided with a stepped connection portion, the handwheel is arranged on the stepped connection portion, and the handwheel and the stepped connection portion are in a threaded connection.

9. The gas cylinder valve according to claim 8, characterized in that: Threaded connection structures are arranged between the valve cover and the first movable cavity and between the upper valve stem and the first sliding cavity.

10. The gas cylinder valve according to claim 9, characterized in that: A washer is arranged between the diaphragm and the bottom of the valve cover. The diaphragm is a metal anti-corrosion elastic diaphragm.

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