A gas meter front valve device with emergency inert gas injection function

Abstract

The application provides a gas meter front valve device with emergency inert gas injection function, and relates to the field of gas meter front valve devices.The device comprises a valve body, the middle part of the valve body is provided with a spherical cavity, the middle part of the spherical cavity is provided with three first flow-through holes in an equidistant annular manner, and the first flow-through holes are communicated with the spherical cavity; a valve core is rotatably installed in the spherical cavity, the valve body is spherical, the middle part of the valve core is provided with a second flow-through hole, two ports of the second flow-through hole correspond to two first flow-through holes respectively, and a valve rod is fixedly installed on the top of the valve core; three groups of telescopic pipes are provided and correspond to the three first flow-through holes one by one.The application realizes the dilution displacement of residual gas and forms an inert protection atmosphere, achieves the integration of valve closing action and emergency inertization, effectively inhibits the risk of combustion and explosion, and solves the problem that the existing front valve only has a shutoff function and cannot integrate inert protection.

Description

Technical Field

[0001] This invention relates to the field of valve devices before gas meters, and more specifically, to a valve device before a gas meter with an emergency inert gas injection function. Background Technology

[0002] In gas transmission and distribution systems, the valve installed upstream of the gas meter is usually called the pre-meter valve, which is a key safety control component of indoor gas pipelines. A conventional pre-meter valve device mainly consists of a valve body, valve core, valve stem, and operating handle. The valve body has an inlet and an outlet port at both ends, which are directly and fixedly connected to the upstream and downstream gas pipelines through rigid connections such as threaded connections and flange connections. Under normal use, the operating handle controls the valve core to open, so that the gas can flow normally. When the gas meter is replaced, the equipment is repaired, or there is an abnormality in gas usage, the valve core can be closed by operating the handle to cut off the gas supply and play a role in isolation and protection. Pre-meter valves currently mostly adopt ball valves or plug valve structures to meet the basic requirements of pressure resistance, airtightness, and operational reliability. Their core function is focused on the on / off control of gas, and their structural form is relatively fixed.

[0003] However, in actual gas application scenarios, when pipeline rupture and leakage occur, or when fire or explosion risks arise due to accidents, simply cutting off the gas supply is insufficient to completely eliminate safety hazards. It is urgent to be able to quickly inject inert gases such as nitrogen and carbon dioxide into the pipeline and downstream equipment while closing the valve to dilute the residual gas concentration, displace air, or form an inert protective atmosphere, thereby suppressing the probability of combustion and explosion risks. However, existing in-meter valve devices only provide gas cut-off functions and do not integrate inert gas injection interfaces and related flow channels. In emergency situations, repair personnel can only rely on external gas injection equipment to connect from other reserved ports or by dismantling pipelines. The operation steps are cumbersome, the response is not timely, and it is difficult to achieve integrated and rapid linkage between valve action and emergency inertization. In addition, during the pipeline connection process of existing in-meter valves, it is usually necessary to use connectors such as unions or pipe sleeves to connect the connecting pipes at both ends of the valve body to the connecting pipes of the upstream and downstream pipelines respectively. During installation, both ends must be accurately aligned and tightened separately, which is cumbersome and reduces the disassembly and assembly efficiency of the in-meter valve.

[0004] Therefore, we have made improvements by proposing a gas meter inlet valve device with an emergency inert gas injection function. Summary of the Invention

[0005] The purpose of this invention is to address the problems of existing in-meter valves, which only have the function of cutting off gas when dealing with risks such as pipeline damage and leakage, fire, and explosion, and cannot achieve integrated emergency inertization linkage; as well as the problems of traditional pipeline connection methods, which require the use of fittings or pipe sleeves, and require precise alignment and separate tightening at both ends during installation, resulting in low disassembly and assembly efficiency.

[0006] To achieve the above-mentioned objectives, the present invention provides a gas meter front valve device with an emergency inert gas injection function to solve the above-mentioned problems.

[0007] The application is as follows: A gas meter inlet valve device with emergency inert gas injection function includes: The valve body has a spherical cavity in the middle, and three first flow holes are equidistantly arranged in a ring in the middle of the spherical cavity, and the first flow holes are connected to the spherical cavity. The valve core is rotatably mounted within the spherical cavity. The valve body is spherical, and a second flow hole is provided in the center of the valve core. The two ports of the second flow hole correspond to two of the first flow holes. A valve stem is fixedly installed on the top of the valve core, and the top end of the valve stem extends out of the valve body and is equipped with a handle; The telescopic fitting is provided with three sets, each corresponding to one of the three first flow holes. The telescopic fitting includes a sleeve fixedly installed on the side of the valve core and communicating with the corresponding first flow hole. A slide tube is slidably installed inside the sleeve, and the outer end of the slide tube is slidably connected to the valve body.

[0008] As a preferred technical solution of this application, the valve body includes an upper shell and a lower shell. The upper shell and the lower shell are each provided with a hemispherical arc-shaped valve cavity in the middle. The side of the arc-shaped valve cavity is provided with three hemispherical first flow slots at equal intervals in an annular shape. Two arc-shaped valve cavities are joined together to form the spherical cavity, and two corresponding first flow slots are joined together to form the first flow hole.

[0009] As a preferred technical solution of this application, three support seats are arranged in an annular shape at equal intervals inside both the upper housing and the lower housing. The top of each support seat is provided with a semi-circular through groove. The inner end of the through groove is connected to the first flow groove opening, and the outer end of the through groove is connected to the valve body that passes through it.

[0010] As a preferred technical solution of this application, the inner diameter of the through groove at the inner end of the support is larger than its outer diameter at the outer end of the support. The sleeve is fixed at the inner end of the through groove, the slide tube is slidably disposed at the outer end of the through groove and its inner end is slidably connected to the inner wall of the sleeve through a piston ring. The outer end of the slide tube is also integrally connected to a connecting pipe.

[0011] As a preferred technical solution of this application, the diameter of the inner end port of the sleeve is larger than the diameter of the first flow hole, and the inner end port of the sleeve is in close contact with the outer shell of the spherical cavity.

[0012] As a preferred technical solution of this application, it also includes an adjustment structure. The adjustment mechanism includes a connecting rod fixed on the slide tube. An adjustment ring coaxial with the valve stem is rotatably mounted on the upper housing. An adjustment groove is provided on the adjustment ring. The adjustment groove is an arc-shaped groove. The inner end and the outer end of the arc-shaped groove are coaxial. The top end of the connecting rod is slidably connected to the arc-shaped groove.

[0013] As a preferred technical solution of this application, a movable slot is provided on the support seat of the upper housing for the connecting rod to pass through and move linearly, and the adjusting ring is rotatably installed on the top of the upper housing.

[0014] As a preferred technical solution of this application, the adjusting mechanism further includes an inner ratchet mechanism installed between the adjusting ring and the valve stem. The inner side of the adjusting ring has a connecting ring coaxial with the valve stem. The inner ratchet mechanism includes a ratchet fixed to the inner wall of the connecting ring. A ratchet tooth groove is formed on the ratchet along its circumferential direction. A pawl disc is fixed on the valve stem. Multiple pawls are annularly hinged on the outer side of the pawl disc. An elastic reset member is installed on the inner side of the pawl disc, which abuts against the inner side of the active pawl. The outer end of the pawl is adapted to the ratchet tooth groove.

[0015] As a preferred technical solution of this application, the included angle between the two ends of the adjustment groove is 60°, and there are two adjustment grooves corresponding to each connecting rod, which are arranged symmetrically, and the two adjustment grooves corresponding to two adjacent connecting rods are smoothly connected.

[0016] As a preferred technical solution of this application, a damping pad is installed between the ratchet disk and the upper housing.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the scheme of this application: 1. By setting three first flow holes in a ring at equal intervals in the valve body, and installing three sets of telescopic fittings composed of sleeves and slides, two sets are connected to the gas inlet pipe and the gas outlet pipe respectively, and the third set serves as the inert gas injection interface and internal flow channel; the valve core is spherical and has a second flow hole in the middle. Under normal gas supply conditions, the second flow hole connects the two first flow holes corresponding to the gas inlet end and the gas outlet end, so as to realize the normal flow of gas; when emergency inerting is required, the valve core is rotated by the handle and valve stem, so that the second flow hole connects the two first flow holes corresponding to the inert gas injection end and the gas outlet end, and at the same time cuts off the gas inlet channel. At this time, nitrogen or carbon dioxide and other inert gases can be quickly injected into the pipeline and downstream equipment through the inert gas interface in the telescopic fitting to dilute and displace the residual gas and form an inert protective atmosphere, so as to achieve the integrated and rapid linkage of valve closing action and emergency inerting, effectively suppressing the risk of combustion and explosion, and solving the problem that the existing front valve only has the shut-off function and cannot integrate inerting protection. 2. By setting the fittings of each interface of the valve body as an axially telescopic sleeve structure composed of a sleeve and a slide tube, the slide tube is slidably installed in the sleeve, and its outer end extends out of the valve body and is integrally connected to the connecting pipe; an adjusting ring coaxial with the valve stem is rotatably installed on the top of the upper housing, and an arc-shaped adjusting groove is opened on the adjusting ring. The top end of the connecting rod fixed on the slide tube passes through the adjusting groove; when the adjusting ring is rotated, the arc-shaped groove drives the connecting rod to make linear movement along the radial direction of the valve body, thereby driving the slide tube to extend or retract relative to the sleeve; when installing or disassembling the valve, all connecting pipes can be retracted first, so that the valve body can be easily put into or removed from the installation position. After the valve body is in place, the adjusting ring is rotated in the opposite direction to push out each connecting pipe synchronously, so as to connect with the external pipeline. This greatly reduces the difficulty of aligning multiple pipelines synchronously and significantly improves the efficiency of disassembly and assembly of the valve before the meter. 3. By setting an internal ratchet mechanism between the valve stem and the adjusting ring, when the handle is rotated in the first direction, the internal ratchet is in a slipping state, driving only the valve core to rotate independently, which is used to switch between two working modes: gas direct flow and emergency inertia. At this time, the adjusting ring and the telescopic pipe remain stationary. When the handle is continuously rotated in the opposite single direction, the internal ratchet engages and drives the adjusting ring to rotate synchronously. The adjusting ring has two symmetrically distributed and smoothly connected closed adjusting grooves for each set of telescopic pipes. The adjusting grooves corresponding to adjacent connecting rods are also smoothly connected. The top of the connecting rod fixed to the slide pipe slides cyclically in the closed annular groove. By using the radial displacement difference formed by the 60° included angle between the two ends of the adjusting groove, the three sets of telescopic pipes are driven to complete the "extend-retract" cyclic reciprocating motion synchronously. That is, continuous unidirectional rotation can realize the sequential extension and retraction of the telescopic pipes. The two directions of the valve stem are used to control the state of the valve core and the telescopic pipes respectively. The structure is compact and the operation is simple and convenient. Attached Figure Description

[0018] Figure 1A schematic diagram of the overall structure of the valve device before the gas meter with emergency inert gas injection function provided in this application; Figure 2 A schematic diagram of the upper and lower housings of the gas meter front valve device with emergency inert gas injection function provided in this application; Figure 3 A schematic diagram of the structure of the gas meter with emergency inert gas injection function provided in this application, showing the damping pad of the front valve device being separated from the upper housing; Figure 4 A schematic diagram of the internal ratchet mechanism and upper housing of the front valve device of the gas meter with emergency inert gas injection function provided in this application; Figure 5 A schematic diagram of the connecting rod and movable slot of the front valve device of the gas meter with emergency inert gas injection function provided in this application; Figure 6 A schematic diagram of the connection between the connecting rod and the regulating groove of the front valve device of the gas meter with emergency inert gas injection function provided in this application; Figure 7 A schematic diagram of the connection between the valve core and the lower housing of the gas meter front valve device with emergency inert gas injection function provided in this application; Figure 8 A schematic diagram of the valve core of the gas meter front valve device with emergency inert gas injection function provided in this application.

[0019] The image shows: 1. Valve body; 2. Valve core; 3. Second flow hole; 4. Valve stem; 5. Handle; 6. Sleeve; 7. Slide tube; 8. Upper housing; 9. Lower housing; 10. Arc-shaped valve cavity; 11. First flow groove; 12. Support seat; 13. Through groove; 14. Connecting pipe; 15. Connecting rod; 16. Adjusting ring; 17. Adjusting groove; 18. Movable groove; 19. Connecting ring; 20. Ratchet; 21. Ratchet groove; 22. Pad disc; 23. Pad; 24. Elastic reset element; 25. Damping pad. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example: Refer to Figures 1 to 8 As shown in the figure, this embodiment provides a gas meter inlet valve device with emergency inert gas injection function, which aims to solve the problems of existing inlet valves only having gas cut-off function when dealing with risks such as pipeline damage and leakage or fire and explosion, and being unable to achieve integrated emergency inertization linkage, as well as the problems of traditional pipeline connection methods requiring the use of fittings or pipe sleeves, requiring precise alignment and separate tightening at both ends during installation, and low disassembly and assembly efficiency.

[0023] In this embodiment, the valve body 1 is composed of an upper shell 8 and a lower shell 9 joined together. Both the upper shell 8 and the lower shell 9 have a hemispherical arc-shaped valve cavity 10 in their middle sections. The two arc-shaped valve cavities 10, when joined together, form a complete spherical cavity. Three support seats 12 are arranged equidistantly in an annular pattern inside both the upper shell 8 and the lower shell 9. Each support seat 12 has a hemispherical through groove 13 at its top. The inner end of the through groove 13 communicates with a first flow slot 11 located on the side of the arc-shaped valve cavity 10. Two corresponding first flow slots 11 are joined together to form… The first flow hole, and the three first flow holes are respectively connected to the spherical cavity; the three first flow holes are equally distributed at 120° on the circumference of the spherical cavity, corresponding to the gas inlet end, the gas outlet end and the inert gas injection end respectively. This makes the valve device not only have conventional gas inlet and outlet channels, but also integrate an inert gas injection interface and internal flow channel, providing a structural basis for the subsequent integrated linkage of gas cut-off and emergency inertization, and solving the problem that the existing front valve only has the cut-off function and cannot integrate inertization protection.

[0024] Furthermore, it also includes a valve core 2, which is spherical and rotatably installed in the spherical cavity. A second flow hole 3 is provided in the middle of the valve core 2. The two ports of the second flow hole 3 can correspond to any two of the three first flow holes, thereby achieving selective communication. Preferably, the outer wall of the valve core 2 and the inner wall of the spherical cavity form an airtight seal by means of a precision fit clearance and a grease film. It also includes a valve stem 4, which is fixedly installed on the top of the valve core 2. The top of the valve stem 4 extends out of the upper housing 8 and is equipped with a handle 5 for the operator to hold and rotate.

[0025] Under normal operating conditions, the second flow hole 3 of the valve core 2 connects the two first flow holes corresponding to the gas inlet end and the gas outlet end. The gas enters the spherical cavity through the gas inlet end telescopic fitting of the valve body 1, and flows out from the gas outlet end telescopic fitting after passing through the second flow hole 3, realizing the normal supply of gas to the meter and downstream equipment. At this time, the first flow hole corresponding to the inert gas injection end is blocked by the spherical outer wall of the valve core 2. The airtight seal formed by the precision fit clearance and the grease film between the outer wall of the valve core 2 and the inner wall of the spherical cavity ensures that the flow channel of the inert gas injection end is reliably cut off, preventing the inert gas from accidentally entering the downstream pipeline in non-emergency situations.

[0026] Considering that existing in-meter valves require the use of connectors such as unions or sleeves when connecting to pipelines, and that both ends need to be precisely aligned and tightened during installation, resulting in low disassembly and assembly efficiency, this embodiment is provided with three sets of telescopic fittings, each corresponding to one of the three first flow holes; among them, two sets of telescopic fittings corresponding to the gas inlet end and the gas outlet end are used to connect the upstream gas pipeline and the downstream meter, respectively, and one set of telescopic fittings corresponding to the inert gas injection end is used to connect the inert gas supply pipeline; each set of telescopic fittings includes a sleeve 6 fixedly installed at the inner end of the through groove 13 of the support base 12, and a slide pipe 7 slidably installed in the sleeve 6. The outer end of the slide pipe 7 is also integrally connected to a connecting pipe 14 for docking with an external gas pipeline or inert gas supply pipeline.

[0027] The inner diameter of the through groove 13 at its inner end is larger than the outer diameter at its outer end. The sleeve 6 is fixed at the inner end, and the slide tube 7 is slidably disposed at the outer end. At least one piston ring is embedded in the outer circumference of the inner end of the slide tube 7. The outer edge of the piston ring elastically abuts against the inner wall of the sleeve 6. During the axial sliding of the slide tube 7 relative to the sleeve 6, it always maintains airtight contact to prevent the gas or inert gas in the tube from leaking outward through the gap between the sleeve and the slide tube. The diameter of the inner end port of the sleeve 6 is larger than the diameter of the first flow hole and is in close contact with the outer shell of the spherical cavity to ensure reliable sealing of the flow channel.

[0028] By setting the fittings of each interface of the valve body 1 as an axially expandable sleeve structure consisting of a sleeve 6 and a slide tube 7, two of the three sets of expansion fittings are used to connect the gas inlet pipe and the gas outlet pipe, while the third set serves as an inert gas injection interface and internal flow channel, thus realizing the integration of interface functions.

[0029] In case of emergencies such as pipeline rupture and leakage, fire or explosion risk, the operator holds the handle 5 and rotates it in the first direction. The valve core 2 rotates accordingly, and its second flow hole 3 connects the two first flow holes corresponding to the inert gas injection end and the gas outlet end, while cutting off the gas inlet passage. Under normal gas supply conditions, the connecting pipe 14 of the telescopic fitting corresponding to the inert gas injection end is always connected to the external inert gas supply pipeline, and the inert gas source of the pipeline is in a standby state.

[0030] When valve core 2 rotates to the emergency inertization position, the second flow hole 3 directly connects the first flow hole at the inert gas injection end with the first flow hole at the gas outlet end. Nitrogen or carbon dioxide in the inert gas supply pipeline is quickly injected into the downstream pipeline and equipment through the corresponding telescopic fittings, the first flow hole, the second flow hole 3, and the telescopic fitting at the outlet end. This dilutes and displaces the residual gas and forms an inert protective atmosphere, achieving integrated and rapid linkage between valve closing action and emergency inertization, effectively suppressing the risk of combustion and explosion.

[0031] To drive the three sets of telescopic pipes to extend and retract synchronously, this embodiment also includes an adjustment mechanism. The adjustment mechanism includes a connecting rod 15 fixed on each slide pipe 7 and an adjustment ring 16 rotatably mounted on the top of the upper housing 8. The adjustment ring 16 is coaxially arranged with the valve stem 4. An adjustment groove 17 is provided on the adjustment ring 16. The adjustment groove 17 is an arc-shaped groove, with its inner and outer ends coaxial but in different radial positions. The support seat 12 of the upper housing 8 has a movable slot 18 through which the connecting rod 15 can pass and move linearly. The top end of the connecting rod 15 passes into the adjustment groove 17 and is slidably connected to it.

[0032] When the adjusting ring 16 rotates, the arc-shaped contour of the adjusting groove 17 drives the connecting rod 15 to make radial linear movement along the movable groove 18, thereby driving the slide tube 7 to extend or retract relative to the sleeve 6, realizing the connection or disconnection of the connecting pipe 14 with the external pipeline. When installing or disassembling the valve, all connecting pipes 14 can be retracted first, so that the valve body 1 can be easily put into or removed from the installation position. After the valve body 1 is in place, each connecting pipe 14 is pushed out synchronously to be connected with the external pipeline, which greatly reduces the difficulty of aligning multiple pipelines synchronously and significantly improves the efficiency of disassembly and assembly of the valve before the meter.

[0033] Considering that the use of the same handle for daily gas on / off operation and pipeline disassembly / installation operation is prone to malfunction, it is necessary to achieve independent control of the two operations. In this embodiment, an internal ratchet mechanism is also provided between the regulating ring 16 and the valve stem 4. Specifically, the inner side of the adjusting ring 16 has a connecting ring 19 coaxial with the valve stem 4. A ratchet 20 is fixed to the inner wall of the connecting ring 19, and a ratchet groove 21 is formed on the ratchet 20 along its circumferential direction. A pawl disc 22 is fixed on the valve stem 4. Multiple pawls 23 are hinged in an annular shape on the outer side of the pawl disc 22. The outer end of the pawl 23 is adapted to the ratchet groove 21. An elastic reset member 24 is installed on the inner side of the pawl disc 22, which abuts against the inner side of each pawl 23, so as to keep the pawl 23 tending to open outward. A damping pad 25 is also installed between the pawl disc 22 and the upper housing 8. The damping pad 25 applies a certain frictional resistance to the pawl disc 22 to prevent the handle 5 from freely deflecting due to pipeline vibration or gravity when there is no external force, ensuring that the valve core 2 is stably positioned at the set working angle, while providing the operator with a moderate rotational damping feel.

[0034] Based on the aforementioned internal ratchet mechanism and combined with the contour design of the adjusting groove on the adjusting ring, this device enables time-sharing control of valve core channel switching and reciprocating motion of telescopic components by rotating the handle in one direction. Specifically, the adjusting groove 17 on the adjusting ring 16 adopts a closed ring design, with an included angle of 60° at both ends of the adjusting groove 17. Two symmetrically distributed and smoothly connected arc-shaped groove segments are provided for each set of telescopic components, and the adjusting grooves corresponding to adjacent connecting rods 15 also maintain smooth communication.

[0035] In the above-mentioned emergency inertization operation, when the operator holds the handle 5 and rotates it in the first direction, the inner ratchet mechanism is in a slipping state, the pawl 23 slides along the ratchet groove 21, the valve stem 4 only drives the valve core 2 to rotate independently, and the adjusting ring 16 and the telescopic fitting remain stationary, thereby ensuring that the operation of switching the gas channel will not accidentally trigger the loosening of the pipeline interface.

[0036] When it is necessary to install or disassemble the valve device, the operator holds the handle 5 and rotates it continuously in the second direction opposite to the first direction. At this time, the inner ratchet mechanism is engaged, the pawl 23 is engaged in the ratchet groove 21, and the valve stem 4 drives the adjusting ring 16 to rotate synchronously. The top of the connecting rod 15, which is fixed to the slide tube 7, slides in a closed annular groove. By utilizing the radial displacement difference formed by the 60° included angle between the two ends of the adjusting groove, the three sets of telescopic pipe fittings are driven to complete the cyclic reciprocating motion of pushing out and retracting synchronously. Taking one of the connecting rods 15 as a reference, when its top end slides from the inner end to the outer end along the first adjusting groove under the action of the adjusting ring 16, the slide tube 7 changes from the retracted state to the extended state. The adjusting ring 16 continues to rotate in the same direction, and the top end of the connecting rod 15 transitions to the second symmetrical adjusting groove through a smooth connecting section. Under the constraint of this adjusting groove, it slides back from the outer end to the inner end, and the slide tube 7 retracts from the extended state to the retracted state. When installing the valve body 1, all connecting pipes 14 can be retracted by rotating the handle 5 in one direction first, and the valve body 1 can be easily placed into the installation position without the need for precise alignment of the upstream and downstream pipelines. After the valve body 1 is in place, continue to rotate the handle 5 in the same direction to push out each connecting pipe 14 simultaneously, completing the connection with the external pipeline. When disassembling the valve body 1, simply continue to rotate the handle 5 in the same direction, and the connecting pipes 14 will retract sequentially, allowing the valve body 1 to easily detach from the installation position. The entire disassembly and assembly process can be completed by simply rotating the handle in one direction continuously.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A valve device before a gas meter with an emergency inert gas injection function, characterized in that, include: The valve body (1) has a spherical cavity in the middle, and three first flow holes are equidistantly arranged in a ring in the middle of the spherical cavity. The first flow holes are connected to the spherical cavity. The valve core (2) is rotatably installed in the spherical cavity. The valve body (1) is spherical. A second flow hole (3) is provided in the middle of the valve core (2). The two ports of the second flow hole (3) correspond to two of the first flow holes. The valve stem (4) is fixedly installed on the top of the valve core (2), and the top end of the valve stem (4) extends out of the valve body (1) and is equipped with a handle (5). The telescopic fitting is provided with three sets, each corresponding to one of the three first flow holes. The telescopic fitting includes a sleeve (6) fixedly installed on the side of the valve core (2) and communicating with the corresponding first flow hole. A slide tube (7) is slidably installed inside the sleeve (6). The outer end of the slide tube (7) is slidably connected to the valve body (1).

2. The gas meter inlet valve device with emergency inert gas injection function according to claim 1, characterized in that, The valve body (1) includes an upper shell (8) and a lower shell (9). Both the upper shell (8) and the lower shell (9) are provided with a hemispherical arc-shaped valve cavity (10) in the middle. The side of the arc-shaped valve cavity (10) is provided with three hemispherical first flow slots (11) at equal intervals. Two arc-shaped valve cavities (10) are joined together to form the spherical cavity, and two corresponding first flow slots (11) are joined together to form the first flow hole.

3. The gas meter inlet valve device with emergency inert gas injection function according to claim 2, characterized in that, The upper housing (8) and the lower housing (9) are each provided with three support seats (12) arranged in a ring at equal intervals. The top of each support seat (12) is provided with a semi-arc-shaped through groove (13). The inner end of the through groove (13) is connected to the first flow groove (11), and the outer end of the through groove (13) is connected to the valve body (1) that is connected through it.

4. The gas meter inlet valve device with emergency inert gas injection function according to claim 3, characterized in that, The inner diameter of the through groove (13) at the inner end of the support base (12) is larger than its outer diameter at the outer end of the support base (12). The sleeve (6) is fixed at the inner end of the through groove (13). The slide tube (7) is slidably disposed at the outer end of the through groove (13) and its inner end is slidably connected to the inner wall of the sleeve (6) through a piston ring. The outer end of the slide tube (7) is also integrally connected to a connecting pipe (14).

5. A gas meter inlet valve device with emergency inert gas injection function according to claim 4, characterized in that, The inner end port diameter of the sleeve (6) is larger than the diameter of the first flow hole, and the inner end port of the sleeve (6) is in close contact with the outer shell of the spherical cavity.

6. A gas meter inlet valve device with emergency inert gas injection function according to claim 5, characterized in that, It also includes an adjustment structure, the adjustment mechanism including a connecting rod (15) fixed on the slide tube (7), an adjustment ring (16) coaxial with the valve stem (4) is rotatably mounted on the upper housing (8), the adjustment ring (16) is provided with an adjustment groove (17), the adjustment groove (17) is an arc groove, the inner end and the outer end of the arc groove are coaxial, and the top end of the connecting rod (15) is slidably connected to the arc groove.

7. A gas meter inlet valve device with emergency inert gas injection function according to claim 6, characterized in that, An active slot (18) is provided on the support base (12) of the upper housing (8) for the connecting rod (15) to pass through and make linear movements, and the adjusting ring (16) is rotatably installed on the top of the upper housing (8).

8. A gas meter inlet valve device with emergency inert gas injection function according to claim 7, characterized in that, The adjustment mechanism also includes an inner ratchet mechanism installed between the adjustment ring (16) and the valve stem (4). The inner side of the adjustment ring (16) has a connecting ring (19) coaxial with the valve stem (4). The inner ratchet mechanism includes a ratchet (20) fixed to the inner wall of the connecting ring (19). The ratchet (20) has a ratchet groove (21) along its circumferential direction. The valve stem (4) is fixed with a pawl disc (22). The outer side of the pawl disc (22) is hinged with multiple pawls (23) in an annular shape. The inner side of the pawl disc (22) is equipped with an elastic reset member (24) that abuts against the inner side of the active pawl (23). The outer end of the pawl (23) is adapted to the ratchet groove (21).

9. A gas meter inlet valve device with emergency inert gas injection function according to claim 8, characterized in that, The included angle between the two ends of the adjustment groove (17) is 60°. Each connecting rod (15) has two adjustment grooves (17) arranged symmetrically. The two adjustment grooves (17) corresponding to two adjacent connecting rods (15) are smoothly connected.

10. A gas meter inlet valve device with emergency inert gas injection function according to claim 9, characterized in that, A damping pad (25) is installed between the ratchet disc (22) and the upper housing (8).

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