Overcurrent cut-off gas valve

Abstract

This utility model provides an overcurrent shut-off gas valve, belonging to the field of valve technology. It solves the problem of low gas flow rate caused by the need for overcurrent shut-off functionality. It includes a valve body and an overcurrent shut-off assembly disposed within the inlet end of the valve body. The overcurrent shut-off assembly includes a connecting seat, a shut-off core, and a spring. The shut-off core includes a rod and a sealing part. The connecting seat is a cylindrical shape with open ends and a straight inner bore. A guide post is provided inside the connecting seat, and several connecting rods are integrally fixed between the guide post and the connecting seat. The sealing part is connected to the rear end of the rod, and the front end of the rod passes through the guide post. The spring is sleeved on the guide post, with both ends abutting against the connecting rod and the sealing part, respectively. The sealing part is located outside the rear end of the connecting seat, and an installation groove is provided on its outer periphery. A sealing gasket is provided in the installation groove, extending out of the installation groove. The outer diameter of the sealing gasket is larger than the inner diameter of the connecting seat. It has the advantages of providing both overcurrent shut-off functionality and high gas flow rate.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to an overcurrent shut-off gas valve. Background Technology

[0002] With the widespread use of natural gas in households, fires caused by gas overflows and sudden increases in gas pressure leading to gas meter explosions are frequent. Therefore, a gas shut-off valve is typically installed between the gas stove and the gas cylinder. For example, the gas shut-off ball valve disclosed in patent application number 201620722076.X includes a valve body with a valve cavity, a ball, a valve stem, a knob, and a connector for connecting to the gas cylinder. The knob is located at the top of the valve body and rotates the ball via the valve stem. The ball is rotatably connected to the valve cavity of the valve body. The connector is connected to the side of the valve body and communicates with the valve cavity. A nozzle for connecting to a hose is located on the other side of the valve body. The ball valve also includes a gas shut-off device that cuts off the gas flow when the pressure at one end of the connector drops. This gas shut-off device is connected inside the connector and near one end of the ball. The overcurrent cut-off device includes a connecting seat, a movable push rod, a plug cap, and a spring. One end of the connecting seat is threaded into the end of the connector near the sphere, and the other end leads to the gas cylinder. The connecting seat has a radial guide plate with a guide hole at its center. The plug cap is located in the connector on the side of the guide plate facing the sphere. The plug cap includes a hollow column, a hollow spherical crown, and a push pin connected in sequence. The push pin is located on the spherical surface of the hollow spherical crown. The end of the connecting seat near the sphere has a snap-fit ​​hole for engaging with the hollow column. One end of the movable push rod is connected to the inner spherical surface of the hollow spherical crown, and the other end is slidably connected to the guide hole on the guide plate. The end of the movable push rod away from the plug cap has a baffle. The spring is sleeved on the movable push rod in the connector on the side of the guide plate near the gas cylinder, with one end of the spring abutting against the guide plate and the other end abutting against the baffle. A sealing ring is provided at the connection between the connecting seat and the connector, and a sealing groove is provided in the corresponding connector to engage with the sealing ring.

[0003] In use, connect the ball valve connector to the gas cylinder, and the nozzle to the gas stove via a flexible hose. When the hose malfunctions, the pressure at the nozzle drops instantly, causing a sudden increase in the pressure difference across the overcurrent cut-off device. The high-pressure gas cylinder pressure forces the movable push rod to slide the cap rapidly towards the ball, instantly locking the hollow cylinder into the locking hole of the connector, thus sealing the gas and preventing leakage. Once the hose issue is resolved, rotate the knob to turn the ball, using the spherical surface to push the push pin back. Simultaneously, the spring causes the movable push rod to return the cap to its initial position, restoring the ball valve to normal operation. At this point, opening the valve again allows gas from the cylinder to safely flow to the gas stove.

[0004] The overcurrent cutoff is achieved by the engagement of the hollow column of the plug cap with the snap-fit ​​hole of the connector. The plug cap is located inside the connector, meaning that the overcurrent cutoff is achieved on the inner side of the connector (this is specified in the instruction manual). Figure 1 (It can also be seen without a doubt). Since the plug is located inside the connector, it means that the gas can only flow through the gap between the outer peripheral wall of the plug and the inner peripheral wall of the connector, which results in a very small actual gas flow rate. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an overflow shut-off gas valve, which solves the problem of low gas flow caused by the need for overflow shut-off function.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A gas valve with overcurrent shut-off includes a valve body with an outlet and an inlet at its front and rear ends, respectively; a ball core rotatably disposed within the valve body; and an overcurrent shut-off assembly disposed within the inlet end. The overcurrent shut-off assembly includes a connecting seat, a shut-off core disposed inside the connecting seat and movable in the front-rear direction, and a spring acting on the shut-off core. The shut-off core includes a rod and a sealing portion fixed to one end of the rod. The connecting seat is characterized by being cylindrical with openings at both ends, having a straight inner bore, and having a sealing portion disposed within the connecting seat along the front-rear direction. The guide post has several connecting rods integrally fixed between its outer peripheral wall and the inner peripheral wall of the connecting seat. The sealing part is connected to the rear end of the rod. The front end of the rod passes through the guide post. A spring is sleeved on the guide post, and both ends of the spring abut against the connecting rod and the sealing part, respectively. The front end of the rod is provided with a stop, which abuts against the front end face of the guide post. The sealing part is located outside the rear end of the connecting seat. The outer peripheral side of the sealing part is provided with a mounting groove. A sealing gasket is provided in the mounting groove. The sealing gasket extends out of the mounting groove, and the outer diameter of the sealing gasket is larger than the inner diameter of the connecting seat.

[0008] Under normal operating conditions, the ball core is in a state where the inlet and outlet ends are connected. At this time, the gas pressure is relatively low, and the cut-off core, under the elastic force of the spring, is in a state where the stop head abuts against the front face of the guide post and the sealing part is located outside the rear end of the connector. When the hose detaches, causing a sudden drop in pressure at the outlet end, the gas flow rate will suddenly increase, causing the pressure of the gas acting on the cut-off core to increase instantaneously. This pushes the cut-off core forward against the spring force. Since the connector is a cylindrical shape with open ends and the inner hole of the connector is a straight hole, and the outer diameter of the sealing gasket is larger than the inner diameter of the connector, the sealing gasket will abut against the rear end face of the connector as the cut-off core moves forward, thereby sealing the outer port of the connector's inner hole and achieving overcurrent cut-off. Then, the user controls the rotation of the ball core to close this overcurrent cut-off gas valve and reset the cut-off core. After the hose is reconnected, the user controls the rotation of the ball core again to reopen this overcurrent cut-off gas valve.

[0009] In this overcurrent shut-off gas valve, the connecting seat is designed as a cylindrical shape with open ends and a straight inner bore. A guide post is installed inside the connecting seat along the front-to-back direction. The rod of the cutting core passes through the guide post, allowing the cutting core and the connecting seat to be movably connected in the front-to-back direction. The sealing part of the cutting core is connected to the rear end of the rod and located outside the rear end of the connecting seat. The outer periphery of the sealing part is provided with a mounting groove, and a sealing gasket is provided in the mounting groove. The sealing gasket extends out of the mounting groove, and the outer diameter of the sealing gasket is larger than the inner diameter of the connecting seat. This changes the position on the connecting seat that cooperates with the cutting core to achieve overcurrent shut-off from the inner side of the connecting seat in the existing design to the rear end of the connecting seat. As a result, the inner bore of the connecting seat can be made directly as a straight bore without the need to provide a reduced bore diameter part inside the connecting seat to cooperate with the cutting core. Furthermore, the sealing part being located outside the rear end of the connecting seat means that the sealing part will not occupy the flow area for gas to pass through inside the connecting seat. Thus, this overcurrent shut-off gas valve can have both overcurrent shut-off function and a sufficiently large gas flow rate.

[0010] In the aforementioned overcurrent shut-off gas valve, the mounting groove is located near the rear end of the sealing part, and the sealing part located in front of the mounting groove is a frustum-shaped part with an outer diameter that gradually decreases from back to front. The outer diameter of the sealing gasket is greater than the maximum outer diameter of the sealing part located in front of the mounting groove.

[0011] Under normal conditions, the cut-off core may remain completely stationary or move slightly forward. When slightly forward, the sealing portion located in front of the mounting groove will be positioned inside the rear end of the connector. This overcurrent shut-off gas valve designs the sealing portion in front of the mounting groove as a frustum-shaped section with an outer diameter that gradually decreases from back to front. This means that the cross-sectional area of ​​this sealing portion is smaller towards the front, thus minimizing its impact on the gas flow rate.

[0012] In the aforementioned overcurrent shut-off gas valve, the sealing part located behind the mounting groove is in the shape of a circular plate, and the outer diameter of the sealing part located behind the mounting groove is greater than or equal to the outer diameter of the sealing gasket.

[0013] In the overcurrent shut-off state, the sealing gasket abuts against the rear end of the connecting seat to form a seal, and the abutment between the sealing gasket and the connecting seat resists the forward pushing force of the shut-off core. This overcurrent shut-off gas valve sets the sealing part located on the rear side of the mounting groove into a circular plate shape, and sets the outer diameter of this sealing part to be greater than or equal to the outer diameter of the sealing gasket. This ensures that the entire rear side of the sealing gasket is abutted, thereby supporting the sealing gasket and preventing the sealing gasket from deforming due to prolonged exposure to high gas pressure, which could lead to failure of the overcurrent shut-off function.

[0014] In the aforementioned overcurrent shut-off gas valve, the rear end face of the sealing part is provided with a groove in the central area, and a columnar lifting part is provided protruding from the central area of ​​the bottom wall of the groove.

[0015] The sealing part is located outside the rear end of the connector, and even in the overcurrent cut-off state, the sealing part abuts against the rear end of the connector; that is, the sealing part is never completely inside the connector under any circumstances. Furthermore, a groove is provided in the center region of the rear end of the sealing part, and a columnar lifting part protrudes from the center region of the bottom wall of the groove. This allows the user to remove the overcurrent cut-off gas valve from the gas pipeline and then use a tool to clamp the lifting part and pull it backward to open it when the valve fails to reset by rotating the ball core.

[0016] In the aforementioned overcurrent shut-off gas valve, the stop head is conical, and the shut-off core is provided with a strip groove extending from the front end of the stop head to the rod.

[0017] The conical shape allows the user to smoothly generate a backward pushing force on the cutting core when rotating the ball core in the overcurrent cutting state. The cutting core has a strip groove extending from the front end of the stop head to the rod, and the presence of the strip groove allows the stop head to pass through the guide post by retraction.

[0018] In the aforementioned overcurrent shut-off gas valve, the valve body includes a main body and a connector with its front end threadedly connected to the rear end of the main body. A positioning step is provided in the front port of the connector, and a rear sealing valve seat is abutted in the positioning step. The rear sealing valve seat abuts against one side of the ball core. An abutting step is provided behind the positioning step in the connector. An annular shoulder is integrally provided on the outer periphery of the front end of the connecting seat. The annular shoulder abuts against the abutting step, and the rear sealing valve seat abuts against the annular shoulder.

[0019] In existing technologies, connectors are typically positioned using threaded connections within the joint. Threaded connections carry the risk of loosening; excessive loosening can lead to detachment, causing the overcurrent shut-off function to fail or even obstructing the normal flow of gas. This overcurrent shut-off gas valve, however, features an abutment step behind the positioning step within the joint, and an integrally formed annular shoulder on the outer circumference of the front end of the connector. The annular shoulder abuts against the abutment step, and the rear sealing valve seat rests against the annular shoulder, securing the connector within the joint. This connection method ensures the connector is firmly positioned within the joint without the risk of loosening or detachment, thus improving structural reliability.

[0020] Furthermore, since existing connectors are threaded into the joint, a sealing ring is required on the outside of the connector to prevent leakage between the connector and the joint. However, in this overcurrent shut-off gas valve, the rear sealing seat abutting against the annular shoulder already forms a seal, thus eliminating the need for a sealing ring on the outside of the connector.

[0021] Compared with the prior art, this overcurrent shut-off gas valve has a guide post arranged in the front-to-back direction inside the connecting seat. The rod of the cut-off core passes through the guide post, and the sealing part of the cut-off core is connected to the rear end of the rod and located outside the rear end of the connecting seat. The outer periphery of the sealing part is provided with a mounting groove, and a sealing gasket is provided in the mounting groove. The sealing gasket extends out of the mounting groove and its outer diameter is larger than the inner diameter of the connecting seat. This changes the position on the connecting seat used to cooperate with the cut-off core to achieve overcurrent shut-off from the inside of the connecting seat to the rear end of the connecting seat. As a result, the inner hole of the connecting seat can be made into a straight hole without the need to set a reduced diameter part in the connecting seat to cooperate with the cut-off core. Furthermore, the sealing part being located outside the rear end of the connecting seat means that the sealing part will not occupy the flow area for gas to pass through in the connecting seat. Thus, this overcurrent shut-off gas valve can have a sufficiently large gas flow rate while having an overcurrent shut-off function. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the overcurrent shut-off gas valve.

[0023] Figure 2 yes Figure 1 Enlarged view of the joint.

[0024] Figure 3 This is a three-dimensional diagram showing the cut core.

[0025] In the diagram, 1. Valve body; 2. Ball core; 2a. Through hole; 3. Valve stem; 4. Handle; 5. Overflow cut-off assembly; 6. Connector; 7. Connecting seat; 7a. Guide post; 7b. Connecting rod; 7c. Annular shoulder; 8. Cut-off core; 8a. Stem; 8b. Sealing part; 8b1. Mounting groove; 8b2. Groove; 8c. Stop; 8d. Strip groove; 8e. Lifting part; 9. Spring; 10. Sealing gasket; 11. Body; 12. Connector; 12a. Positioning step; 12b. Abutment step; 13. Front sealing seat; 14. Rear sealing seat. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 As shown, the overcurrent shut-off gas valve includes a valve body 1 with an outlet and an inlet at its front and rear ends, respectively. A ball core 2 and a valve stem 3 are rotatably mounted inside the valve body 1. The ball core 2 has a through hole 2a, which allows the inlet and outlet ends to connect through the through hole 2a. The valve stem 3 extends out of the valve body 1 and is connected to a handle 4. An overcurrent shut-off assembly 5 is located inside the inlet end of the valve body 1, and a connector 6, which can be threaded onto a flexible hose, is connected to the outlet end of the valve body 1. In use, the inlet end of the valve body 1 is connected to a gas cylinder, and the connector 6 is connected to the gas stove via a flexible hose.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, the overcurrent cut-off assembly 5 includes a connecting seat 7, a cutting core 8 disposed inside the connecting seat 7 and movable in the front-rear direction, and a spring 9 acting on the cutting core 8. The cutting core 8 includes a rod portion 8a and a sealing portion 8b fixedly connected to one end of the rod portion 8a. The connecting seat 7 is a cylindrical shape with openings at both ends. The inner hole of the connecting seat 7 is a straight hole. A guide post 7a is provided inside the connecting seat 7 in the front-rear direction. Several connecting rods 7b are integrally fixed between the outer peripheral wall of the guide post 7a and the inner peripheral wall of the connecting seat 7. The sealing portion 8b is connected to the rear end of the rod portion 8a. The front end of the rod portion 8a passes through the guide post 7a. The spring 9 is sleeved on the guide post 7a. The two ends of the spring 9 abut against the connecting rod 7b and the sealing portion 8b, respectively. A stop head 8c is provided at the front end of the rod portion 8a. The stop head 8c is conical. A strip groove 8d is provided on the cutting core 8, extending from the front end of the stop head 8c to the rod portion 8a. The stop head 8c abuts against the front end face of the guide post 7a. The sealing part 8b is located outside the rear end of the connecting seat 7. An installation groove 8b1 is provided on the outer periphery of the sealing part 8b. A sealing gasket 10 is provided inside the installation groove 8b1, extending beyond the installation groove 8b1. The outer diameter of the sealing gasket 10 is larger than the inner diameter of the connecting seat 7. Specifically, the installation groove 8b1 is located near the rear end of the sealing part 8b. The sealing part 8b located in front of the installation groove 8b1 is a frustum-shaped section with its outer diameter gradually decreasing from rear to front. The outer diameter of the sealing gasket 10 is larger than the maximum outer diameter of the sealing part 8b located in front of the installation groove 8b1. The sealing part 8b located behind the installation groove 8b1 is plate-shaped, and its outer diameter is greater than or equal to the outer diameter of the sealing gasket 10. A groove 8b2 is provided in the central area of ​​the rear end face of the sealing part 8b. A columnar lifting part 8e protrudes from the central area of ​​the bottom wall of the groove 8b2.

[0029] Furthermore, such as Figure 1 and Figure 2 As shown, the valve body 1 includes a body 11 and a connector 12. The front end of the connector 12 is threaded into the rear end of the body 11. A front sealing valve seat 13 is abutted inside the body 11. A positioning step 12a is provided inside the front port of the connector 12. A rear sealing valve seat 14 is abutted inside the positioning step 12a. The front sealing valve seat 13 and the rear sealing valve seat 14 abut against the front and rear sides of the ball core 2. An abutting step 12b is provided behind the positioning step 12a inside the connector 12. An annular shoulder 7c is integrally provided on the outer periphery of the front end of the connecting seat 7. The annular shoulder 7c abuts against the abutting step 12b, and the rear sealing valve seat 14 abuts against the annular shoulder 7c.

[0030] Under normal operating conditions, the ball core 2 is in the state where the through hole 2a connects the inlet and outlet ends. At this time, the gas pressure is relatively low, and the cut-off core 8, under the elastic force of the spring 9, is in the state where the stop 8c abuts against the front end of the guide post 7a and the sealing part 8b is located outside the rear end of the connecting seat 7. When the hose detaches, causing a sudden drop in pressure at the outlet end, the gas flow rate will suddenly increase, causing the pressure of the gas acting on the cut-off core 8 to increase instantaneously. This pushes the cut-off core 8 to move forward against the spring 9, thereby causing the sealing gasket 10 to abut against the rear end face of the connecting seat 7 to form a seal and achieve the function of overcurrent cut-off, preventing gas from leaking directly to the outside. In this state, the front end of the cut-off core 8, that is, the front end of the stop 8c, is located in the rear end opening of the through hole 2a on the ball core 2. Next, the user first drives the ball core 2 to rotate via the handle 4 to close this overcurrent cut-off gas valve. Since the stop 8c is conical, it will squeeze the stop 8c during the rotation of the ball core 2, pushing the cut-off core 8 to reset. After the hose is reconnected, the user can then use the handle 4 to rotate the ball core 2 to reopen the gas shut-off valve.

[0031] In this overcurrent shut-off gas valve, the connecting seat 7 is cylindrical with open ends and a straight inner bore. A guide post 7a is provided inside the connecting seat 7 along the front-to-back direction. The rod portion 8a of the cutting core 8 passes through the guide post 7a, allowing the cutting core 8 to be movably connected to the connecting seat 7 along the front-to-back direction. The sealing portion 8b of the cutting core 8 is connected to the rear end of the rod portion 8a and located outside the rear end of the connecting seat 7. An installation groove 8b1 is provided on the outer periphery of the sealing portion 8b. A sealing gasket 10 is provided inside the installation groove 8b1, extending out of the installation groove 8b1. The outer diameter of the sealing gasket 10 is larger than that of the connecting seat 7. The inner diameter of the connector 7 is adjusted so that the position on the connector 7 used to cooperate with the cut-off core 8 to achieve overcurrent cut-off is changed from the inner side of the connector 7 in the existing case to the rear end of the connector 7. This allows the inner hole of the connector 7 to be made into a straight hole without the need to set a reduced diameter part in the connector 7 to cooperate with the cut-off core 8. Furthermore, the sealing part 8b is located outside the rear end of the connector 7, which means that the sealing part 8b will not occupy the flow area of ​​the gas supply in the connector 7. Thus, the overcurrent cut-off assembly 5 can have a sufficiently large gas flow rate while having an overcurrent cut-off function.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A gas valve with overcurrent shut-off, comprising a valve body (1) with an outlet and an inlet at its front and rear ends respectively, a ball core (2) rotatably disposed within the valve body (1), and an overcurrent shut-off assembly (5) disposed within the inlet end, wherein the overcurrent shut-off assembly (5) comprises a connecting seat (7), a shut-off core (8) disposed inside the connecting seat (7) and movable in the front-rear direction, and a spring (9) acting on the shut-off core (8), wherein the shut-off core (8) comprises a rod (8a) and a sealing portion (8b) fixedly connected to one end of the rod (8a), characterized in that, The connecting seat (7) is a cylindrical shape with openings at both ends. The inner hole of the connecting seat (7) is a straight hole. A guide post (7a) is provided in the connecting seat (7) along the front-rear direction. Several connecting rods (7b) are integrally fixed between the outer peripheral wall of the guide post (7a) and the inner peripheral wall of the connecting seat (7). The sealing part (8b) is connected to the rear end of the rod (8a). The front end of the rod (8a) passes through the guide post (7a). The spring (9) is sleeved on the guide post (7a). The two ends of the spring (9) abut against the connecting post (7a). On the rod (7b) and the sealing part (8b), the front end of the rod (8a) is provided with a stop (8c), the stop (8c) abuts against the front end face of the guide post (7a), the sealing part (8b) is located outside the rear end of the connecting seat (7), the outer periphery of the sealing part (8b) is provided with a mounting groove (8b1), a sealing gasket (10) is provided in the mounting groove (8b1), the sealing gasket (10) extends out of the mounting groove (8b1), and the outer diameter of the sealing gasket (10) is larger than the inner diameter of the connecting seat (7).

2. The overcurrent shut-off gas valve according to claim 1, characterized in that, The mounting groove (8b1) is located near the rear end of the sealing part (8b). The sealing part (8b) located in front of the mounting groove (8b1) is a frustum-shaped part with an outer diameter that gradually decreases from back to front. The outer diameter of the sealing gasket (10) is greater than the maximum outer diameter of the sealing part (8b) located in front of the mounting groove (8b1).

3. The overcurrent shut-off gas valve according to claim 2, characterized in that, The sealing part (8b) located behind the mounting groove (8b1) is in the shape of a circular plate, and the outer diameter of the sealing part (8b) located behind the mounting groove (8b1) is greater than or equal to the outer diameter of the sealing gasket (10).

4. The overcurrent shut-off gas valve according to claim 3, characterized in that, The sealing part (8b) has a groove (8b2) in the center of the rear end face, and a columnar lifting part (8e) is provided in the center of the bottom wall of the groove (8b2).

5. The overcurrent shut-off gas valve according to claim 1, 2, 3, or 4, characterized in that, The stop (8c) is conical, and the cut-off core (8) is provided with a strip groove (8d) extending from the front end of the stop (8c) to the rod (8a).

6. The overcurrent shut-off gas valve according to claim 1, 2, 3, or 4, characterized in that, The valve body (1) includes a main body (11) and a connector (12) with its front end threadedly connected to the rear end of the main body (11). The connector (12) has a positioning step (12a) in its front port. A rear sealing valve seat (14) is abutted in the positioning step (12a). The rear sealing valve seat (14) abuts against one side of the ball core (2). The connector (12) has an abutting step (12b) behind the positioning step (12a). The front end of the connecting seat (7) has an annular shoulder (7c) integrally provided on its outer periphery. The annular shoulder (7c) abuts against the abutting step (12b) and the rear sealing valve seat (14) abuts against the annular shoulder (7c).

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