CN113431907A

CN113431907A - Fluid valve integrating opening, closing and pressure reducing functions

Info

Publication number: CN113431907A
Application number: CN202010209562.2A
Authority: CN
Inventors: 林庆辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-09-24
Anticipated expiration: 2040-03-23
Also published as: CN113431907B

Abstract

The invention provides a fluid valve integrating opening, closing and pressure reducing functions, wherein a cavity pressure body is arranged on an upper cavity of a valve body, a through seal is arranged on a lower cavity of the valve body, a side cavity is used for installing an external device, and the upper cavity, the lower cavity and the side cavity are respectively connected by through holes; the cavity pressure body is internally provided with a support pillar device, a sealing device and a blocking body thereof; the valve core is arranged in the through holes connected with the upper cavity and the lower cavity of the valve body and the upper cavity and the lower cavity of the valve body, the upper head is connected with the sealing device, and the lower head is arranged in the through sealing cavity. The invention can utilize gas pressure or spring force or gas and spring mixed pressure to realize the pressure reduction of the fluid, the pressure reducing operation can be executed by rotating the cavity pressure body downwards, and the valve is closed when the rotating cavity pressure body upwards; when the prop device is operated to prop against the sealing device, the whole valve is in a valve opening and closing state, and the rotary cavity pressure body can realize the valve opening and closing upwards or downwards.

Description

Fluid valve integrating opening, closing and pressure reducing functions

Technical Field

The invention relates to the technical field of valve machinery, in particular to a fluid valve integrating the functions of opening, closing and pressure reduction.

Background

Opening and closing valves and pressure reducing valves are widely used in various fields of industry and related industries due to their special functions.

Most products of an opening and closing valve and a pressure reducing valve in the prior art are respectively provided with own functions, for example, a household liquefied gas angle valve has a special opening and closing function, a pressure reducing valve connected to the angle valve is specially arranged for reducing the pressure of gas discharged by a liquefied gas cylinder, and the opening and closing valve and the pressure reducing valve are combined to form a complex structure, have larger size, are easy to damage and leak; for example, opening and closing valves are generally installed beside some pressure reducing valve systems in factories; for example, an opening and closing valve is required to be arranged beside a pressure reducing valve of a tap water pipeline. With the increase of the number of valves to be installed, problems in the installation, maintenance, leakage, and complexity of the system are greatly increased. In many valves, a valve which can combine two valve functional structures together, can reduce pressure while opening and can be safe, simple and convenient is not yet provided.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a valve which has a simple and safe structure and can directly perform pressure reduction operation while performing opening operation.

In order to solve the technical problems, the invention adopts the following scheme:

the cavity pressure body is arranged in an upper cavity of the valve body, a top column device is arranged in a hole of a central cylindrical boss of the cavity pressure body, a light hole is provided with a sealing and plugging device, and the baffle body is arranged in an internal thread hole below the light hole;

the valve core is provided with a hole in the center, and is erected in through holes connected with the upper cavity and the lower cavity of the valve body as well as the upper cavity and the lower cavity of the valve body, the upper head penetrates through the blocking body and is connected with the sealing plug, the lower head is arranged in the through sealing cavity, a damping channel is formed between the valve core and the blocking body and forms a channel for fluid to pass through with the valve body, and a large boss of the valve core is provided with a sealing gasket b;

a pressure source acting on the valve spool and synthesizing a downward force urging it from the bulk.

In order to further optimize the scheme, in the valve body a, a cavity pressing body is installed on an upper cavity of the valve body a, a through seal is installed on a lower cavity, a side cavity faces towards the upper cavity to facilitate connection and arrangement with an external device, the upper cavity is connected with the lower cavity and the upper cavity is connected with the side cavity through holes, and four-corner bosses which facilitate use of an angle valve wrench are arranged on the periphery of the middle of the valve body.

In order to further optimize the scheme, the valve body further comprises another type, the upper cavity of the valve body b is provided with a cavity pressing body, the lower cavity is provided with a through seal, the side cavity and the side cavity face each other to be favorable for being connected with an external device, and the upper cavity and the lower cavity, the upper cavity and the side cavity and the lower cavity and the side cavity are respectively provided with through holes for connection.

In order to further optimize the scheme, the cavity pressure body is installed in an upper cavity of the valve body through external thread connection, a sealing groove for containing a sealing ring b is arranged above the external thread, a circulation area which is matched with the valve body and is beneficial to fluid flow is arranged below the external thread, a tool withdrawal groove is arranged between a unthreaded hole of the cavity pressure body and an internal thread below the unthreaded hole, an open groove is arranged at the bottommost part of the cavity pressure body below the internal thread and communicated with the circulation area, a threaded hole is arranged at the upper part in a hole of a cylindrical boss in the center of the cavity pressure body and is used for being matched with a thread of a support pillar device, a hole which is matched with an optical axis surface of the support pillar device is arranged below the threaded hole and is arranged at the lower part in the hole, and a hand wheel which is beneficial to rotation of the cavity pressure body is arranged on the peripheral surface of the topmost part of the cavity pressure body.

In order to further optimize the scheme, the piston type sealing plug device is composed of a sealing plug, a sealing ring c and a sealing washer a, a threaded hole matched and connected with the valve core is formed in the center of the sealing plug, the sealing washer a is arranged between the valve core and the sealing plug when the valve core and the sealing plug are matched and connected for sealing, a sealing groove is formed in the outer cylindrical surface of the sealing plug, and the sealing ring c is arranged in the groove.

In order to further optimize the scheme, the plug device also comprises another type, the diaphragm type plug device consists of a plug and a sealing film, a threaded hole which is in matched connection with the valve core is formed in the center of the plug, a sealing groove is formed in the outer cylindrical surface of the plug, a sealing ring is not arranged in the groove, the sealing film is arranged below the plug, the outer edge of the sealing film is arranged in the tool withdrawal groove and is pressed on the cavity pressure body by the blocking ring which is screwed, a through hole is formed in the center of the sealing film, and the inner edge of the sealing film is pressed on the plug when the valve core is in matched connection with the plug.

In order to further optimize the scheme, the complicated jacking column device comprises a jacking column a, a jacking core, a sealing rubber gasket and a sealing ring a, wherein the jacking column a is provided with an external thread which is connected and matched with the cavity pressure body, an optical axis surface which is matched with the cavity pressure body is arranged below the external thread, the optical axis surface is provided with a sealing groove, the sealing ring a is arranged in the groove, an annular boss is arranged below the optical axis surface, the center of the jacking column a is provided with a vent hole, the upper surface of the vent hole is provided with a threaded hole, the threaded hole is provided with a vent groove, the vent groove is clamped by a spanner to rotate the top pillar a upwards so that the annular boss is pressed against the cylindrical boss of the cavity pressure body and downwards until the annular boss is pressed against the sealing and plugging device, the threaded hole is used for accommodating the top core and the sealing rubber gasket, the top core is connected with the sealing rubber gasket together, the top core is provided with a thread matched with the top pillar a, the top end face of the top cover is provided with a straight groove which is beneficial to rotating the top core, and the sealing rubber pad can be abutted against the vent hole of the top column a to seal the vent hole by rotating the top core through the straight groove.

In order to further optimize the scheme, the ejection column device also comprises another type, the simple ejection column device is composed of an ejection column b and a sealing gasket c, threads connected and matched with the cavity pressing body are arranged on the ejection column b, an optical axis surface matched with the cavity pressing body is arranged below the threads, an annular boss is arranged below the optical axis surface, the sealing gasket c is accommodated in the annular boss, a ventilation groove beneficial to ventilation is formed in the threads from the top end surface of the ejection column b to the upper side of the annular boss, a straight groove is formed in the top end surface of the ventilation groove, and the sealing gasket c can be abutted to the cylindrical boss of the cavity pressing body when the wrench clamps the straight groove to rotate the ejection column b upwards and can be abutted to the sealing device downwards.

In order to further optimize the scheme, the baffle body is provided with external threads matched with the cavity pressing body, the lower end face of the baffle body is provided with a slotted hole beneficial to wrench operation, the center of the baffle body is provided with a through hole, and the center of the upper end face of the baffle body is provided with an inner concave area.

In order to further optimize the scheme, the through seal is provided with an external thread connected with the valve body, the external thread is provided with a channel groove for fluid to pass through, the through seal is provided with a central hole for accommodating the valve core optical shaft section, the hole wall of the through seal is provided with a sealing groove for accommodating a sealing ring d, and the bottom of the through seal is provided with a straight groove beneficial to wrench operation.

In order to further optimize the solution, one of the pressure sources is a pressure generated by a gas which is placed in the chamber pressure chamber at the upper end of the valve element and in the area communicating therewith.

In order to further optimize the solution, the pressure source further comprises another elastic force generated by an elastic body, and the elastic body is arranged between the top column device and the sealing device.

The invention also relates to a fluid valve with combined opening and closing and pressure reducing functions, which regulates and controls the pressure of the pressure cavity of the valve cavity by connecting the charging, exhausting and pressure regulating connecting device to an external charging and pumping machine, and is characterized in that:

this combination formula is opened and close and fluid valve as an organic whole of decompression function possesses:

the fluid valve integrating the opening and closing functions and the pressure reducing functions of the scheme is characterized in that the air charging, exhausting and pressure regulating connecting device is arranged on the cavity pressure body; the pressure regulating rod mainly comprises a charging and discharging piece, a pressure regulating rod, a sealing ring e and a sealing ring d, wherein the charging and discharging piece is cylindrical, the sealing ring d is installed on the bottom end face of the charging and discharging piece, a boss is arranged at the center of the bottom end face, an external thread is arranged on the boss and used for being installed on a cavity pressure body, an upper hole and a lower hole are formed in the center of the charging and discharging piece, the two holes are communicated, the boss of the pressure regulating rod can be contained in the lower hole, a rod body of the pressure regulating rod is contained in the upper hole, a sealing groove is formed in the rod body of the pressure regulating rod and used for containing the sealing ring e, a straight head is arranged at the lower part of the pressure regulating rod, a threaded hole is formed in the outer cylindrical face of the charging and discharging piece, and the threaded hole is communicated with the lower hole in the center of the charging and discharging piece.

The fluid valve integrating the opening, closing and pressure reducing functions with the structure is different from the prior art that the purpose can be achieved only by installing the opening, closing and pressure reducing valve, but only by installing the fluid valve. For household liquefied gas, a fluid valve with a three-cavity structure is used, when liquefied gas is filled in a liquefied gas filling station, a worker only needs to screw down a cavity pressing body and screw down and tightly screw a prop device, filling operation can be carried out from a hole at the side part of a valve body, after the filling operation is finished, the screw-up cavity pressing body is screwed in a reverse direction, and finally the prop device is screwed in the reverse direction; when a user needs to start or close the fluid in the storage device, the user only needs to unscrew or unscrew the cavity pressure body, and the operation is the same as that of the prior art. The whole structure is simple and beautiful in appearance, damage is prevented, and the sealing protection effect is good; for valves with properties of factory pipelines or tap water pipelines, corresponding fluid valves with integrated opening, closing and pressure reducing functions can be selected according to needs, and only an air and pressure regulating device needs to be assembled and connected with an external pressure pipeline under the condition that pressure needs to be changed or regulated frequently, so that the pressure of a pressure source can be regulated.

The beneficial effects are that:

1. the fluid valve integrating the opening and closing functions with the pressure reducing valve and the opening and closing valve is integrated, so that the structure is simpler and firmer, the use is safer, and the manufacturing cost is reduced.

2. The adjustment of the outflow of fluid can be achieved using local atmospheric pressure as a medium. Atmospheric pressure varies from place to place, but the present invention can achieve a constant outflow of fluid at different atmospheric pressures.

3. The flow rate of the fluid flowing out can be controlled by means of the compression energy of the gas according to the preset gas pressure input.

4. The combination of local atmospheric pressure and a spring can be used as a medium to realize the flow regulation of the fluid outflow.

5. The adjustment of the flow rate of the fluid outflow can be realized by using the force of the spring as a medium.

6. When the liquefied gas rubber pipe is connected with a valve body, the liquefied gas rubber pipe is installed along the naturally drooping shape of the pipe, so that the probability of cracking of the pipe wall of the connecting part is reduced.

7. Can be used as an opening and closing valve.

Drawings

FIG. 1 is a schematic structural view of a complicated prop device and a piston type plugging device of a three-chamber fluid valve in a fluid-free state according to the present invention;

FIG. 2 is a schematic structural diagram of the state of an open/close valve of a complex prop device and a piston type plugging device of a three-chamber fluid valve of the present invention;

FIG. 3 is a schematic view of the complex prop device and the piston type plugging device of the three-chamber fluid valve of the present invention in an open state;

FIG. 4 is a schematic structural diagram of a complex pillar jacking device and a piston type plugging device of a three-chamber fluid valve of the present invention in a closed state;

FIG. 5 is a schematic diagram of a complex pillar device and a diaphragm stopper device of a three-chamber fluid valve according to the present invention;

FIG. 6 is a schematic diagram of a simplified stem means and piston type plugging means of a three-chamber fluid valve of the present invention;

FIG. 7 is a schematic diagram of a three-chamber fluid valve of the present invention in a pure spring power state;

FIG. 8 is a schematic diagram of a closed-cavity pressure-loaded spring of a three-cavity fluid valve according to the present invention;

FIG. 9 is a schematic view of the overall appearance of the three-chamber fluid valve assembly inflation/deflation pressure regulating connection device of the present invention;

FIG. 10 is a top view of the valve body a of the present invention;

FIG. 11 is a bottom view of the chamber pressure body of the present invention;

FIG. 12 is a top view of the through seal of the present invention;

FIG. 13 is a bottom view of the baffle of the present invention;

FIG. 14 is a top view of a top post a of the present invention;

FIG. 15 is a top view of a top post b of the present invention;

FIG. 16 is a top view of the core of the present invention;

FIG. 17 is a cross-sectional view of a valve cartridge a of the present invention;

FIG. 18 is a cross-sectional view of a cartridge b of the present invention;

FIG. 19 is a cross-sectional view of a cartridge c of the present invention;

FIG. 20 is a cross-sectional view of a valve cartridge d of the present invention;

FIG. 21 is a schematic view of a complex stem device and a diaphragm stopper device of the multi-chamber fluid valve of the present invention;

FIG. 22 is a schematic view of the seal installation of the present invention;

FIG. 23 is a sectional view of the pressure regulating connection device;

FIG. 24 is a three-chamber vacuum fluid valve with integrated on/off and overflow functions;

FIG. 25 is a three-chamber piston vacuum fluid valve with integrated on/off and overflow functions;

FIG. 26 is a three-chamber pressurized fluid valve with integrated on/off and overflow functions;

FIG. 27 is a multi-chamber diaphragm fluid valve that integrates both on and off and overflow functions.

Description of reference numerals:

1-cavity pressure body, 101-unthreaded hole, 102-open slot, 103-cylindrical boss, 104-handwheel, 2-top core, 201-straight slot, 3-sealing rubber gasket, 4-sealing ring a, 5-top column a, 501-annular boss, 502-air vent, 503-vent slot, 6-sealing ring b, 7-sealing ring c, 8-sealing plug, 9-sealing gasket a, 10-baffle body, 1001-through hole, 10011-damping channel, 1002-concave area, 1003-slotted hole, 11-valve body a, 1101-annular groove, 1102-annular boss, 1103-through hole b, 1104-through hole a, 11041-channel, 1105-four corner boss, 12-b, 13-valve core a, 1301-inner hexagonal sealing gasket, 1302-optical axis segment, 1303-large boss, 1304-channel segment, 13041-channel segment boss, 1305-through hole, 14-sealing ring d, 15-through seal, 1501-channel groove, 1502-central hole, 1503-straight groove, 16-top column b, 1601-vent groove, 1602-straight groove, 1603-annular boss, 17-sealing washer c, 18-sealing washer, 19-spring a, 20-spring b, 21-pressure regulating rod, 2101-straight head, 2102-boss, 22-charging and discharging piece, 2201-boss, 23-sealing washer e, 24-sealing washer d, 25-valve body b, 26-sealing washer e, 27-end enclosure, 28-f, 29-air isolating ring and 30-sealing washer f, 31-spool b, 32-spool d.

Detailed Description

In order to explain technical contents, structural features, and objects and effects achieved by the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Example 1

Referring to fig. 1, a three-cavity fluid valve structure of a complex top pillar device and a piston type plugging device of a fluid valve with integrated opening, closing and pressure reducing functions mainly comprises a cavity pressure body 1, a top core 2, a sealing rubber gasket 3, a sealing ring a4, a top pillar a5, a sealing ring b6, a sealing ring c7, a plugging 8, a sealing washer a9, a stopper 10, a valve body a11, a sealing washer b12, a valve core a13, a sealing ring d14 and a through seal 15. The upper cavity of the valve body a11 is provided with a cavity pressure body 1, the cavity pressure body 1 can rotate in the upper cavity, and can move up and down by means of the thread matching with the valve body a11 during rotation, so that the valve mainly plays a role in driving related parts to close and open the valve and provides a storage space of a pressure source; the sealing ring b6 is arranged in the sealing groove of the cavity pressure body 1 to isolate the circulation of fluid and the external gas of the valve; the lower cavity of the valve body a11 is provided with a through seal 15, the through seal 15 is in threaded fit with the valve body a11 and is tightly fixed in the lower cavity, one function of the through seal 15 is to isolate the communication between the gas in the inner cavity of the through seal 15 and the fluid, and the other function is to provide a channel for the fluid to circulate; after the through seal 15 is installed, a section of internal thread is left on the valve body a11 below the through seal, and an external device can be installed, such as an external threaded gas cylinder and the like, and the external device can also be installed on the external thread of the valve body a13, such as the existing household liquefied gas steel cylinder; the side cavity faces to facilitate the connection arrangement with an external device, and a threaded hole connected with the external device is formed in the side cavity; the upper cavity is connected with the lower cavity through holes, and the upper cavity is connected with the side cavity through holes; one of the complicated jacking column devices is arranged in the hole of the cylindrical boss 103 in the center of the cavity pressure body 1, the complicated jacking column device can rotate in the hole of the cylindrical boss 103, one of the functions of the complicated jacking column device is that the jacking core 2 is rotated to separate or connect the inner cavity of the cavity pressure body 1 to be communicated with the gas outside the valve, and then the gas pressure in the inner cavity of the cavity pressure body 1 is used as a pressure source to set the pressure reduction capacity; secondly, when the rotating top pillar a5 is screwed down to abut against the sealing device, the whole valve state can also be used as a stop valve; thirdly, the amount of downward rotation of the top pillar a5 can be used as the fine adjustment function of the pressure source. One of the sealing devices is arranged in the unthreaded hole 101 of the cavity pressure body 1, namely a piston type sealing device, and the piston type sealing device moves up and down in the unthreaded hole 101 of the cavity pressure body under the influence of the pressure difference between an upper pressure source and a lower fluid pressure of the piston type sealing device; the volume of the pressure source storage space, the density of gas in the storage space, the diameter of the unthreaded hole 101, the diameter of the inner cavity of the through seal 15, the friction coefficient of a sealing ring of the through seal and other factors are directly related to the decompression range of the valve; a tool withdrawal groove is arranged below the unthreaded hole, and the baffle body 10 is arranged in an internal thread hole below the tool withdrawal groove and is fixed with the cavity pressure body 1 through threads. One of the functions of the device is to limit the downward stroke of the sealing device and to lift the sealing device upwards when the cavity pressure body 1 is upwards; secondly, a damping channel 10011 is formed between the damping channel and the valve core a 13; one kind of the valve core, the valve core a13 stands in the upper chamber and lower chamber of the valve body a11 and the through hole that its upper and lower chambers connect, the upper head connects with the screw thread of the plugging device, the lower head locates in the inner chamber of the through seal 15, contain the seal gasket b12 on the valve core a13 in order to guarantee the leakproofness when the valve closes, the valve core a13 moves up and down with the plugging device, move up and down and make the seal gasket b12 of the valve core a13 and annular boss 1102 on the valve body a change, the change of the degree of opening and closing controls the liquefied gas flow.

Referring to fig. 1 and 10, further, an inner thread for installing the cavity pressure body 1 is disposed in the upper cavity of the valve body a11, an annular groove 1101 for fluid circulation is disposed below the inner thread, an unthreaded hole matched with the sealing ring b6 is disposed above the inner thread, an inner thread for installing the through seal 15 is disposed in the lower cavity, an outer thread connected with an external device (such as a liquefied gas tank) is disposed at the periphery of the lower cavity, the upper cavity is connected with the lower cavity through hole a1104, and an annular boss 1102 is disposed in the lower cavity of the valve body a11, and when the valve is closed, the annular boss 1102 is matched with the sealing ring b12 on the valve core a13 to ensure the sealing performance. The periphery of a valve body a11 at a through hole a1104 part is provided with a four-corner boss 1105 beneficial to an angle valve wrench, an internal thread connected with an external device (such as a hand wheel connected with a liquefied gas rubber hose) is arranged in a side cavity of the valve body a11, a cavity opening of the side cavity faces downwards for 0-60 degrees, and the orientation is along the naturally drooping posture of the liquefied gas rubber hose, so that the cracking at the back of a joint when the liquefied gas rubber hose is connected for a long time is facilitated, the liquefied gas hose is better protected, and the side cavity is connected with an upper cavity through hole b 1103.

Referring to fig. 1 and 11, further, the cavity pressure body 1 is installed in an upper cavity of the valve body a11 through external thread connection, a sealing groove for accommodating a sealing ring b6 is arranged above the external thread, an unthreaded hole 101 for accommodating a sealing device is arranged in an inner cavity of the cavity pressure body, a tool withdrawal groove is arranged below the unthreaded hole 101, an internal thread for installing a stopper 10 is arranged below the tool withdrawal groove, an open groove 102 facilitating liquefied gas circulation is arranged at the bottommost part of the cavity pressure body 1 below the internal thread, a cylindrical boss 103 is arranged in the center of the inner cavity of the cavity pressure body 1, a space around the cylindrical boss 103 is arranged as a storage pressure source, a threaded hole for installing a support pillar a5 is arranged in the center of the cylindrical boss 103, an unthreaded hole matched with the support pillar a5 and the sealing ring a4 is arranged below the threaded hole, and a handwheel 104 facilitating rotation of the cavity pressure body 1 is arranged on the peripheral surface of the uppermost part of the cavity pressure body 1.

Furthermore, one of the plug devices, the piston type plug device, is composed of a plug 8, a seal ring c7 and a seal washer a9, a threaded hole matched and connected with the valve core a13 is arranged in the center of the plug 8, the seal washer a9 is arranged between the valve core 13 and the plug 8 for sealing when the valve core and the plug 8 are matched and connected, a seal groove is arranged on the outer cylindrical surface of the plug 8, the seal ring c7 is arranged in the groove, and polytetrafluoroethylene with an extremely low friction rate is recommended to be used as the material of the seal ring c 7.

Referring to fig. 1, 14 and 16, a complicated prop device of the prop device is further composed of a prop a5, a core 2, a sealing rubber pad 3 and a sealing ring a4, wherein the prop a5 is provided with an external thread which is connected and matched with the cavity pressure body 1, an optical axis surface which is matched with the cavity pressure body 1 is arranged below the external thread, the optical axis surface is provided with a sealing groove, the sealing ring a4 is arranged in the groove, an annular boss 501 is arranged below the optical axis surface, a vent hole 502 is arranged in the center of the prop a5, a threaded hole is arranged above the vent hole, the threaded hole is provided with a vent groove 503, the vent groove 503 is clamped by a wrench to rotate the top pillar a5, the top core 2 and the sealing rubber gasket 3 are accommodated in the threaded hole, the top core 2 and the sealing rubber gasket 3 are connected together, the top core 2 is provided with a thread matched with the top pillar a5, the top end face of the top core is provided with a straight groove 201 which is beneficial to rotating the top core 2, and the sealing rubber pad 3 can be abutted against the vent hole 503 of the top column a5 to seal the vent hole 503 by rotating the top core 2 through the straight groove 201.

Referring to fig. 1 and 17, further, the top of the valve core a13 is a thread matching with the sealing plug 8, a tool withdrawal groove is arranged below the thread, the tool withdrawal groove can accommodate a sealing gasket a9, a channel section 1304 is arranged below the tool withdrawal groove, the channel section 1304 includes a channel section boss 13041 at the lower end (the channel section boss 13041 is arranged and suitable for gas-like fluid), the channel section boss 13041 is in clearance fit with a through hole a1104, gas can flow out from the clearance, the channel section 1304 and the channel section boss 13041 thereof are matched with the through hole a1104 to form a channel 11041 for fluid to pass through, an annular large boss 1303 is arranged below the channel section boss 13041, an annular groove is arranged on the large boss 1303, a sealing gasket b12 is arranged in the groove, an optical axis section 1302 matched with the through seal 15 is arranged below the large boss 1303, and the optical axis section 1302 is in clearance fit with an inner cavity of the through hole a1104, which is beneficial to reducing the effect of fluid pressure on the valve core a 13. The valve core a13 is provided with a through hole 1305 in the center, the through hole 1305 is communicated with the inner hexagonal socket 1301 below the through hole, and the air pressure of the cavity on the sealing device and the air pressure of the cavity of the seal 15 are the same under the through hole.

Referring to fig. 17, 18, 19 and 20, the four valve cores are provided, besides the above-mentioned valve core a13 structure, there are also b, c and d structures of the valve core, and the difference between the b structure of the valve core and the valve core a13 is that the channel boss 13041 is reduced, which is suitable for large displacement places. The valve core c structure is that the center of the valve core a13 structure is not through hole, the valve core d structure is that the center of the valve core b structure is not through hole, under the condition of not through hole, the pressure of the pressure source is different from the air pressure of the inner cavity of the through seal 15, the air in the inner cavity of the through seal 15 is compressed during assembly, and the compressed air pushes the valve core c or the valve core d; if the cavity of the through seal 15 is vacuum during assembly, the valve core c or the valve core d will be sucked down under the vacuum condition.

Referring to fig. 1 and 13, further, the blocking body 10 is provided with a thread engaged with the cavity pressure body 1, a slot 1003 facilitating wrench operation is provided on a lower end surface of the blocking body 10, a through hole 1001 is provided in a center of the blocking body 10, a damping channel 10011 is formed between the through hole 1001 and the valve core 13, and an inner concave area 1002 is provided in a center of an upper end surface of the blocking body 10 to facilitate the pressure of liquefied gas to quickly and comprehensively affect the plugging device.

Referring to fig. 1 and 12, further, the through seal 15 is provided with an external thread connected to the valve body a11, the external thread is provided with a channel groove 1501 for fluid to pass through, the center of the through seal 15 is provided with a central hole 1502 for accommodating the optical axis segment 1302 of the valve core a, the hole wall of the central hole 1502 is provided with a sealing groove and accommodates a sealing ring d14, and the sealing ring d14 is preferably made of ptfe with extremely low friction rate and good sealing performance. The bottom of the through seal 15 is provided with a straight slot 1503 for facilitating wrench operation.

During assembly in this embodiment, the top core 2 and the sealing rubber gasket 3 which are connected together are firstly installed into a threaded hole in the center of the top pillar a5, then the sealing ring a4 is sleeved into a sealing groove of the top pillar a5, and then the assembled complicated top pillar device is installed into a threaded hole of the central cylindrical boss 103 of the cavity pressure body 1; then, a sealing ring c7 is sleeved in a sealing groove of the sealing plug 8 and then is arranged in the cavity pressure body unthreaded hole 101; then, the blocking body 10 is arranged in a threaded hole below the cavity pressure body unthreaded hole 101 and is screwed tightly; then the ejection column a5 is screwed down until the sealing plug 8 is tightly ejected; then, the sealing ring b6 is sleeved into the sealing groove corresponding to the cavity pressure body 1, and then the assembled cavity pressure body is installed into the upper cavity of the valve body a11 and screwed tightly. Then, a sealing washer a9 is arranged in a tool withdrawal groove below the thread of the valve core a13, a sealing washer b12 is arranged on an annular groove of the valve core big boss 1303, after the sealing washer is completed, the assembled valve core is arranged in a lower cavity of the valve body a11, the valve core a13 passes through a valve body through hole a1104 and then passes through a through hole 1001 of the baffle body 10 to be connected with a threaded hole in the center of the sealing plug 8, and the inner hexagon 1301 is rotated by a wrench until the sealing washer is screwed. The sealing ring d14 is placed into a sealing groove in the inner cavity of the through seal 15, the whole through seal 15 is placed into a threaded hole in the lower cavity of the valve body a11 after the sealing ring d14 is assembled, a wrench clamps the straight groove 1503 to be screwed, attention is paid to the fact that the optical axis segment 1302 of the valve core a13 is aligned to and placed in the central hole 1502 of the through seal 15 during screwing, at the moment, the whole fluid valve integrating the opening and closing functions and the pressure reducing function is assembled in the first embodiment, and finally the four-corner boss 1105 of the valve body a11 is buckled by the wrench to install the valve on a gas cylinder or other devices.

Fig. 2, 3 and 4 show various operating states of fig. 1, the use of which is as follows:

referring to fig. 2, the chamber pressure body 1 is rotated down to contact the bottom of the upper chamber of the valve body a11, and then the ventilation slot 503 of the top pillar a5 is locked by a wrench and rotated down until the sealing plug 8 is tightly pressed. The valve core a13 moves downwards along with the sealing plug 8, and the sealing washer b12 is separated from the contact with the annular boss 1102 and forms an opening and closing port through which fluid can pass. The valve core is directly driven to move upwards or downwards through the rotation of the cavity pressure body, and the valve is opened and closed at the moment. The external device is connected to the side cavity of the valve body a11, and the fluid is filled from the side cavity. Fluid enters an annular groove 1101 in the upper cavity from a through hole b1103 of the side cavity, enters a channel 11041 through a cavity pressure body opening groove 102, enters a channel groove 1501 through an opening and closing port, and then enters a gas cylinder or other devices, if liquefied gas is filled, the cavity pressure body 1 is rotated upwards to be screwed, and then the top column a5 is rotated upwards to be screwed, so that the filling operation is completed.

Referring to fig. 3, in the usage scenario of the domestic liquid gas storage tank, the cavity pressure body 1 is rotated down to contact the bottom of the upper cavity of the valve body a 11. After the valve is opened, high-pressure gas in a gas cylinder or other storage devices flows through the sealing channel groove 1501, then flows through the opening and closing port, then flows through the channel 11041, then enters the lower part of the baffle 10, and flows into the cavity below the sealing plug 8 through the damping channel 10011, the sealing plug 8 is pushed upwards as the air pressure of the cavity below the sealing plug 8 is increased, the sealing plug 8 is upwards, the space of the upper sealed cavity of the sealing plug 8 is compressed to be equal to air, the valve core a13 is driven upwards to enable the opening and closing port to be gradually reduced, the opening and closing degree is reduced, the flow rate is reduced, when the air pressure of liquefied gas below the sealing plug 8 is smaller than the air pressure of the gas above the sealing plug 8, the sealing plug 8 is downwards, the valve core a13 is driven downwards to enable the opening and closing port to be increased, the flow rate is increased, the reciprocating operation is carried out until the constant liquefied gas output is finally achieved, the constant gas enters the cavity pressure opening groove 102 and then enters the annular groove 1101, then enters the through hole b1103 of the side cavity and finally flows out of the hand wheel and the rubber air pipe matched with the hand wheel. When the pipeline gas of the gas transmission pipe is cut off, the pressure of the liquefied gas below the sealing plug 8 is increased, at the moment, the sealing plug 8 is upwards due to the pressure difference between the upper part and the lower part, and the opening and closing port is finally reduced and closed through a series of linkage, so that the pressure reduction protection effect is achieved.

Referring to fig. 4, the closing operation can be achieved by rotating the cavity pressure body 1 up to the screwing position. At this time, the stopper 10 connected to the chamber pressure body 1 lifts the piston type plugging device upward, and the valve core a13 moves upward, so that the opening and closing port is completely closed, thereby achieving the purpose of closing the valve.

Compared with household liquefied gas, because the air pressure of each area is different, a pressure source matched with the local area is sometimes used, at the moment, the wrench is clamped in the straight groove 201 in the state that the valve is closed, the top core 2 is rotated upwards, at the moment, external air enters the vent hole 502 through the vent groove 503 of the top column a5 and finally reaches the inner cavity of the upper part of the sealing plug 8, and then the top core 2 is rotated reversely until the sealing rubber pad 3 is abutted against the vent hole 502, so that the inner cavity above the sealing plug 8 becomes a closed inner cavity. This step is intended to be taken with the local atmospheric pressure as the pressure source, a step that is only required upon first use.

Example 2

Referring to fig. 5, in example 2, a sealing ring c7 and a sealing ring a9 are replaced with a sealing film 18 on the basis of example 1, so that a plug 8 and the sealing film 18 constitute another type of plug device, which is called a diaphragm type plug device. The sealing plug 8 is in clearance fit with the unthreaded hole 101 originally, and the gas in the clearance flows smoothly, so that the sealing film 18 is smooth when being blown.

When the diaphragm type sealing plug device is assembled, the sealing plug 8 is firstly placed into the unthreaded hole 101, then the sealing film 18 is placed under the unthreaded hole 101, then the blocking body 10 is installed and screwed, after the blocking body 10 is installed, the outer edge of the sealing film 18 is ensured to be tightly pressed on the wall edge surface of the tool withdrawal groove under the unthreaded hole 101, and after the valve core a13 is matched with the sealing plug 8, the inner hole of the sealing film 18 is ensured to be tightly pressed on the wall edge surface of the tool withdrawal groove of the valve core a 13. The other assembly steps are the same as in example 1 and will not be described in detail. The diaphragm type and piston type sealing and plugging devices are different in application occasions and are configured according to actual requirements.

Example 3

Referring to fig. 6 and 15, in example 3, the top core 2, the sealing rubber mat 3, the sealing ring a4 and the top pillar a5 are replaced by a top pillar b16 and a sealing washer c17 on the basis of example 1, so that the top pillar b16 and the sealing washer c17 constitute another type of top pillar device, which is called a simple type top pillar device. An external thread connected and matched with the cavity pressure body 1 is arranged on the top pillar b16, a ventilation groove 1601 beneficial to ventilation is arranged from the top end face of the top pillar b16 to the upper side of the annular boss 1603, a straight groove 1602 beneficial to wrench rotation is arranged on the top end face of the top pillar b16, the straight groove 1602 can be connected with the ventilation groove 1601, and a sealing washer c17 is arranged on the annular boss 1603. When the simple type top pillar b16 descends until the sealing washer c17 is separated from the cylindrical boss 103 of the cavity pressure body, external air enters the inner cavity of the cavity pressure body 1 through the vent groove 1601, and when the simple type top pillar b16 ascends until the sealing washer c17 abuts against the cylindrical boss 103, the vent groove 1601 is cut off, so that the inner cavity is in a closed state.

Before the simple type support pillar device is assembled into the cavity pressure body 1, only the sealing washer c17 is placed on the annular boss 1603 and then is installed towards the threaded hole of the cylindrical boss 103, and other assembling steps are the same as those in embodiment 1. When the fluid valve of the simple top pillar device is used, the procedure is the same as in example 1. The difference between the complex and simple type of the top pillar device is that the rotation of the top pillar b16 of the simple type top pillar device can make the closed space communicate with the gas outside the valve; while the complicated jack-post device can finely adjust the size of the pressure source by rotating the jack-post a 5.

Example 4

Referring to fig. 7, further, the pressure source further includes another elastic pressure generated by an elastic body, in this embodiment 4, the elastic body means a spring, in embodiment 4, based on embodiment 1, a spring a19 is installed between the top pillar device and the plugging device, a spring b20 is installed between the valve core a13 and the through seal 15, and the spring b20 can be installed or not according to requirements. When the top core 2 is rotated upwards until the sealing rubber pad 3 is separated from the vent hole 502, the external air can be communicated with the air in the cavity of the cavity pressure body, and the pressure source of the valve is supported by the spring force at the moment.

Referring to fig. 8, when the top core 2 is rotated downward until the sealing rubber pad 3 is pressed against the vent hole 502, the external air and the air in the sealed cavity are separated, and the pressure source is composed of the spring force and the air pressure in the sealed cavity.

In the assembly sequence, the spring a19 is only required to be placed after the top column device is installed, and then the sealing and plugging device is placed; the spring b20 is installed after the valve core a13 is installed, and then the through seal 15 is installed after the valve core is placed in the hole of the valve core 13. Spring b20 may be installed as appropriate as required, and spring b20 functions to push valve element a13 upward.

Example 5

Referring to fig. 21, the multi-chamber fluid valve integrating opening and closing functions with pressure reduction is obtained by replacing the valve body a11 with the valve body b25 in the embodiment 2. Compared with a three-cavity fluid valve, the multi-cavity fluid valve is different from a three-cavity fluid valve in that the valve body is changed from three cavities into multiple cavities, the upper cavity of the valve body b25 is communicated with the lower cavity and the side cavity, the side cavity is communicated with the lower cavity, and threads connected with an external device are arranged in the side cavity and the side cavity. The side cavity can be provided in plurality according to the requirement, and the description is not repeated. The multi-chamber structure also allows for a substantial increase in fluid flow through the valve body due to the additional side chambers as compared to the three-chamber structure.

Example 6

Referring to fig. 22, in embodiment 6, on the basis of embodiment 5, the seal head 27 with the sealing gasket e26 is arranged in the lower cavity, and the main purpose is to separate the cavity opening, and the seal head 27 with the sealing gasket e26 can be arranged in the lower cavity or a side cavity as required. Shown in a position disposed in the lower chamber. The sealing head 27 is provided with an external thread matched with the internal thread of the lower cavity, and the lower end surface of the sealing head is provided with an internal hexagonal hole beneficial to wrench operation.

Example 7

Referring to fig. 20 and 24, in embodiment 7, a three-chamber vacuum fluid valve integrating opening, closing and overflowing functions is obtained by replacing the stopper 10 with an air isolating ring 29, placing a sealing washer f28 and a sealing washer f30 on the air isolating ring, and replacing the valve core a13 with a valve core d32 without a sealing washer c7 and a sealing washer a9 on the basis of embodiment 1. The other components were the same as in example 1. The overflow valve mainly uses a vacuum pumping closed cavity as a medium to implement overflow operation.

Example 8

Referring to fig. 25, in a three-chamber vacuum piston fluid valve with integrated opening and closing and overflow functions, in example 8, a sealing ring c7 is disposed on a sealing plug 8 based on example 7, and other parts are the same as those in example 1. The overflow valve mainly uses the vacuum of the pumping closed cavity as the medium to implement the overflow operation, and the effective work of the vacuum is higher than that of the embodiment 7.

Example 9

Referring to fig. 18 and 26, in a three-chamber pressurized fluid valve with integrated opening and closing and overflow functions, in embodiment 8, a valve element d32 is replaced by a valve element b31 on the basis of embodiment 7, and other parts are the same as those in embodiment 7. The overflow valve is mainly used for performing overflow operation by taking high pressure as a medium after a sealed cavity is inflated.

Example 10

Referring to fig. 27, in a multi-chamber vacuum diaphragm type fluid sealing valve integrating opening, closing and overflowing functions, in example 10, a sealing gasket f28 is replaced by a sealing film 18 on the basis of example 7, the outer edge of the sealing film 18 is tightly pressed and attached to the wall edge surface of the tool withdrawal groove below the cavity pressure body unthreaded hole 101 by an air isolating ring 29, after a valve core d32 is matched with a sealing plug 8, the inner hole of the sealing film 18 is also tightly pressed and attached to the wall edge surface of the tool withdrawal groove of a valve core d32, and the rest parts are the same as those in example 7.

The biggest difference between the structure of the pressure reducing valve and the structure of the overflow valve lies in the difference of the functions of the baffle ring 10 and the air isolating ring 29, when the fluid valve integrating the opening function and the overflow function is operated, when the fluid pressure is greater than the pressure of the closed cavity, the valve core is pushed downwards, the fluid flows out, and when the fluid pressure is less than the vacuum pressure of the closed cavity, the valve core is upwards, and the valve is closed.

Example 11

Referring to fig. 9 and 23, the present invention further provides a fluid valve with integrated opening and closing and pressure reducing functions, wherein the inflation, deflation and pressure regulating connecting device is installed on the cavity pressure body of the fluid valve, and the inflation, deflation and pressure regulating connecting device mainly comprises a pressure regulating rod 21, an inflation and deflation element 22, a sealing ring e23 and a sealing ring d 24. Fill and fill piece 22 and be cylindrical, its bottom face is connected with seal ring d24, bottom face center sets up boss 2201, the boss is provided with the external screw thread that is used for installing on the chamber pressure body, fill and fill piece 22 center and set up two holes from top to bottom, two holes communicate with each other, the boss 2102 of pressure regulating pole can be held to the lower hole, the body of rod of pressure regulating pole is held to the upper hole, be provided with the seal groove on the pressure regulating pole 21, be used for holding seal ring e23, the pressure regulating pole bottommost is provided with a word head 2101 and is used for cooperating the word groove 201 of top core or the word groove 1602 of top post b to connect, it fills the face of cylinder of piece and opens and has a screw hole, the screw hole is used for connecting outside inflation joint, the screw hole communicates with each other with the lower hole of centre bore.

A charging, exhausting and pressure regulating connecting device is generally used in occasions needing pressure regulation. Before the inflation, exhaust and pressure regulation device is used, the inflation, exhaust and pressure regulation connecting device is completely installed with an external inflation pipe connector, then, only the boss 2201 of the inflation and exhaust part needs to be aligned with the threaded hole of the cylindrical boss 103 of the cavity pressure body and is installed and screwed, then the pressure regulation rod 21 is pressed down and rotated to enable the closed cavity of the pressure source of the fluid valve to be in an open state, then, the inflation and exhaust operation is carried out on the closed cavity, when the preset pressure value is reached, the pressure regulation rod 21 is rotated reversely to enable the pressure source cavity of the pressure source to be in a closed state, then, the inflation and exhaust part 22 is rotated reversely to enable the inflation and exhaust part to be separated from the cavity pressure body, and the inflation and exhaust operation is finished. If the pressure source needs to be changed frequently, the charging and discharging component can be directly arranged on the cavity pressure body for a long time.

In the above embodiments, the components may be interchanged and recombined as required.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and similar parts between the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an open and close and fluid valve as an organic whole of decompression function which characterized in that:

2. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein:

one kind of valve body, valve body a, its upper chamber installation chamber pressure body, the cavity of resorption installation leads to sealedly, and the side chamber orientation sets up in order being favorable to being connected with external device, and the epicoele respectively has the through-hole to be connected with cavity of resorption, epicoele and side chamber, and valve body middle part periphery sets up the four corners boss that does benefit to angle valve spanner and use.

3. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein:

the valve body also comprises another valve body b, wherein a cavity pressing body is arranged in an upper cavity of the valve body b, a through seal is arranged in a lower cavity of the valve body b, the side cavity and the side cavity face to be favorable for being connected with an external device, and the upper cavity and the lower cavity, the upper cavity and the side cavity and the lower cavity and the side cavity are respectively connected through holes.

4. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the cavity pressure body is installed in an upper cavity of the valve body through external thread connection, a sealing groove for containing a sealing ring b is arranged above the external thread, a circulation area which is matched with the valve body and is beneficial to fluid flow is arranged below the external thread, a tool withdrawal groove is arranged between a unthreaded hole of the cavity pressure body and an internal thread below the unthreaded hole, the bottommost part of the cavity pressure body below the internal thread is provided with an open groove and communicated with the circulation area, the upper part in a hole of a central cylindrical boss of the cavity pressure body is a threaded hole for matching with a thread of a support pillar device, the lower part in the threaded hole, namely the lower part in the hole, is a hole matched with an optical axis surface of the support pillar device, and a hand wheel which is beneficial to rotating the cavity pressure body is arranged on the peripheral surface of the uppermost part of the cavity pressure body.

5. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the piston type sealing plug device is composed of a sealing plug, a sealing ring c and a sealing washer a, a threaded hole which is connected with a valve core in a matched mode is formed in the center of the sealing plug, the sealing washer a is arranged between the valve core and the sealing plug in the matched mode for sealing, a sealing groove is formed in the outer cylindrical surface of the sealing plug, and the sealing ring c is arranged in the groove.

6. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the sealing plug device also comprises another sealing plug device, the diaphragm type sealing plug device is composed of a sealing plug and a sealing film, a threaded hole which is connected with the valve core in a matched mode is formed in the center of the sealing plug, a sealing groove is formed in the outer cylindrical surface of the sealing plug, a sealing ring is not arranged in the groove, the sealing film is arranged below the sealing plug, the outer edge of the sealing film is arranged in a tool withdrawal groove and pressed on a cavity pressure body by the blocking ring which is screwed, a through hole is formed in the center of the sealing film, and the inner edge of the sealing film is pressed on the sealing plug when the valve core is connected with the sealing plug in a matched mode.

7. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: one of the jack-post devices is a complicated jack-post device which comprises a jack-post a, a jack core, a sealing rubber gasket and a sealing ring a, wherein the jack-post a is provided with an external thread which is connected and matched with a cavity pressure body, an optical axis surface which is matched with the cavity pressure body is arranged below the external thread, the optical axis surface is provided with a sealing groove, the sealing ring a is arranged in the groove, an annular boss is arranged below the optical axis surface, the center of the jack-post a is provided with a vent hole, the upper surface of the vent hole is provided with a threaded hole, the threaded hole is provided with a vent groove, the vent groove is clamped by a spanner to rotate the top pillar a upwards so that the annular boss is pressed against the cylindrical boss of the cavity pressure body and downwards until the annular boss is pressed against the sealing and plugging device, the threaded hole is used for accommodating the top core and the sealing rubber gasket, the top core is connected with the sealing rubber gasket together, the top core is provided with a thread matched with the top pillar a, the top end face of the top cover is provided with a straight groove which is beneficial to rotating the top core, and the sealing rubber pad can be abutted against the vent hole of the top column a to seal the vent hole by rotating the top core through the straight groove.

8. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the top column device also comprises another type, the simple type top column device is composed of a top column b and a sealing washer c, a thread which is connected and matched with the cavity pressing body is arranged on the top column b, an optical axis surface which is matched with the cavity pressing body is arranged below the thread, an annular boss is arranged below the optical axis surface, the sealing washer c is arranged in the annular boss, a vent groove which is beneficial to ventilation is formed from the top end surface of the top column b to the thread above the annular boss, a straight groove is arranged on the top end surface of the vent groove, and a wrench clamps the straight groove to rotate the top column b to enable the sealing washer c to be abutted against the cylindrical boss of the cavity pressing body upwards and can be abutted against the sealing device downwards.

9. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the baffle body is provided with external threads matched with the cavity pressing body, the lower end face of the baffle body is provided with a slotted hole beneficial to wrench operation, the center of the baffle body is provided with a through hole, and the center of the upper end face of the baffle body is provided with an inner concave area.

10. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the through seal is provided with an external thread connected with the valve body, the external thread is provided with a channel groove for fluid to pass through, the through seal is provided with a center hole for accommodating the valve core optical shaft section, the hole wall of the through seal is provided with a sealing groove for accommodating a sealing ring d, and the bottom of the through seal is provided with a straight groove beneficial to wrench operation.

11. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein:

one of the pressure sources is a pressure generated by a gas disposed in a cavity pressure chamber at the upper end of the valve core and an area communicating therewith.

12. The fluid valve integrating opening and closing functions with pressure reduction as claimed in claim 1, wherein: the pressure source may further comprise a resilient force generated by an elastomer mounted between the top post means and the obturating means.

13. A combined opening and closing and pressure reducing fluid valve is characterized in that a pressure regulating and controlling device is connected to an external pump and charger to regulate and control the pressure of a pressure cavity of a valve cavity, and the combined opening and closing and pressure reducing fluid valve integrates the functions of opening and closing the valve cavity, and comprises:

the fluid valve of any one of claims 1 to 12, wherein the connecting device for opening/closing and pressure-reducing functions is installed on the cavity pressure member, and comprises a cylindrical charging/discharging member, a pressure-regulating rod, a sealing ring e, and a sealing ring d, wherein the charging/discharging member has a bottom end surface provided with the sealing ring d, a boss is disposed at the center of the bottom end surface, the boss has an external thread for being installed on the cavity pressure member, the charging/discharging member has a center provided with an upper hole and a lower hole, the two holes are communicated, the lower hole can accommodate the boss of the pressure-regulating rod, the upper hole accommodates the rod body of the pressure-regulating rod, the rod body of the pressure-regulating rod is provided with a sealing groove for accommodating the sealing ring e, the lower portion of the pressure-regulating rod is provided with a straight head, and the outer cylindrical surface of the charging/discharging member has a threaded hole, and the threaded hole is communicated with the lower hole at the center of the charging/discharging member.