A standpipe gas safety valve

Abstract

The utility model is specifically related to a kind of vertical pipe gas safety valve, including valve body, valve core, driving mechanism, the driving mechanism includes driver, transmission screw rod and screw rod cover, the screw rod cover center is connected with transmission screw rod outer periphery cooperation and cooperation, the screw rod cover outer periphery one position place ring is equipped with coupling recess, the shaft connecting portion upper end is equipped with the connecting groove of shape adaptation with screw rod cover, the connecting groove inner periphery corresponds the protruding portion of the limit in coupling recess at coupling recess, swing clearance exists between the limit protruding portion and coupling recess, the driver drives transmission screw rod rotation makes screw rod cover and valve core move along valve cavity axial direction.When valve core moves to first closed position, core body part will be self-adapting compensation seal according to the position of valve seat part, to calibrate the error caused by processing or use wear, realize the close cooperation of valve core and valve seat part, improve the reliability of the device used.

Description

Technical Field

[0001] This utility model relates to the field of gas valve technology, specifically to a riser gas safety valve. Background Technology

[0002] A gas safety valve is a device used for gas metering and control. It is typically used in conjunction with a gas meter to achieve accurate measurement and safe control of gas flow. An electric valve, driven by an internal motor, can open or close the gas flow path, thereby controlling the gas supply.

[0003] Gas safety valves are widely used in residential, commercial, and industrial gas metering systems, especially in applications requiring remote control or automated management. For example, smart gas meter systems often integrate motorized valves to facilitate remote meter reading, billing, control, and safety monitoring.

[0004] Existing conventional gas safety valves typically include an actuator, a drive screw and a screw sleeve, and a valve core. The screw sleeve and valve core are fixedly fitted together. The actuator drives the drive screw to rotate, causing the screw sleeve and valve core to rise and fall along it, thereby opening and closing the gas flow path. However, over a long period of time, wear between the valve seat and the valve core can cause insufficient sealing between the valve core and the valve seat, making it impossible to adaptively adjust the sealing position between the valve core and the valve seat. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a riser gas safety valve.

[0006] The technical solution adopted by this utility model is as follows: A riser gas safety valve includes a valve body, a valve core, and a drive mechanism. The valve body is provided with a valve cavity and an inlet and an outlet communicating with the valve cavity. A valve seat is provided on the inner wall of the valve body into the valve cavity, and the valve seat is located between the inlet and the outlet. The valve core includes a shaft connecting part and a core part that cooperates with the valve seat. The drive mechanism includes a driver, a transmission screw, and a screw sleeve. The center of the screw sleeve is connected to the outer periphery of the transmission screw. A connecting groove is provided around the outer periphery of the screw sleeve. A connecting groove adapted to the shape of the screw sleeve is provided at the upper end of the shaft connecting part. A limiting protrusion is provided on the inner periphery of the connecting groove corresponding to the connecting groove, and a swing gap exists between the limiting protrusion and the connecting groove. The driver drives the transmission screw to rotate, causing the screw sleeve and valve core to move axially along the valve cavity. The axial movement of the valve core relative to the valve seat has a first closed position where the core part and the valve seat are sealed together, and a first open position where there is an open space between the core part and the valve seat.

[0007] Preferably, the valve seat portion divides the valve cavity into an inner cavity portion and an outer cavity portion, and the air inlet and air outlet are respectively connected to the inner cavity portion and the outer cavity portion.

[0008] Preferably, a gas leak sensor for detecting the external cavity is provided inside the external cavity.

[0009] Preferably, a position sensing element is provided at a position on the outer periphery of the valve core. When the valve core is in the first closed position and the first open position, the position sensing element is located at the first sensing position and the second sensing position. A first position sensor and a second position sensor are respectively provided in the valve cavity at the first sensing position and the second sensing position.

[0010] Preferably, the valve seat includes a connecting bottom integrally formed in the valve body and an elastic sealing element embedded in the upper end of the connecting bottom. When the valve core is in the first closed position, the core part and the elastic sealing element are tightly fitted together.

[0011] Preferably, the upper end of the elastic seal has an upwardly protruding convex arc surface that matches the core portion.

[0012] Preferably, the lower end of the elastic seal has a deformation groove with an inverted V-shaped cross-section.

[0013] Preferably, the drive mechanism further includes a first gear connected to the drive end of the driver, a second gear connected to the transmission lead screw, and a reduction gear set connected between the first gear and the second gear, wherein the diameter of the second gear is larger than that of the first gear.

[0014] Preferably, the reduction gear set includes at least four different gear shafts, each gear shaft including a large gear portion and a small gear portion, and each gear shaft meshes sequentially between a first gear and a second gear to form a reduction transmission.

[0015] The beneficial effects of this utility model are as follows: the valve core and the lead screw sleeve form an axial movement linkage during the process of the drive screw rotating. At the same time, through the swing gap between the limiting protrusion and the connecting groove, when the valve core moves to the first closed position, the core part will adaptively compensate for the seal according to the position of the valve seat part to calibrate the error caused by processing or wear, so as to achieve a tight fit between the valve core and the valve seat part and improve the reliability of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a front sectional view of an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle; Figure 3 for Figure 2 Enlarged view of the structure at point B in the middle; Figure 4 for Figure 2 Enlarged view of the structure at point C; Figure 5 This is a partial three-dimensional view of an embodiment of the present utility model; In the diagram, 1 is the valve body; 2 is the valve core; 3 is the actuator; 4 is the transmission screw; 5 is the screw sleeve; 6 is the gas leak sensor; 11 is the inner cavity; 12 is the outer cavity; 13 is the valve seat; 21 is the shaft connection; 22 is the core; 23 is the position sensing element; 51 is the connecting groove; 71 is the first position sensor; 72 is the second position sensor; 81 is the first gear; 82 is the second gear; 83 is the gear shaft; 101 is the air inlet; 102 is the air inlet; 131 is the connecting bottom; 132 is the elastic seal; 211 is the connecting groove; 212 is the limiting protrusion; 1321 is the convex arc surface; 1322 is the deformation groove. Detailed Implementation

[0018] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0020] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] like Figures 1 to 5As shown in the illustration, a riser gas safety valve according to an embodiment of this utility model includes a valve body 1, a valve core 2, and a drive mechanism. The valve body 1 has a valve cavity and an inlet 101 and an outlet 102 communicating with the valve cavity. A valve seat 13 is provided on the inner wall of the valve body 1 into the valve cavity, and the valve seat 13 is located between the inlet 101 and the outlet 102. The valve core 2 includes a shaft connecting part 21 and a core part 22 that cooperates with the valve seat 13. The drive mechanism includes a driver 3, a transmission screw 4, and a screw sleeve 5. The center of the screw sleeve 5 is connected to the outer periphery of the transmission screw 4. A connecting groove 51 is provided around the outer periphery of the screw sleeve 5. A connecting groove 211 adapted to the shape of the screw sleeve 5 is provided at the upper end of the shaft connecting part 21. A limiting protrusion 212 is provided on the inner periphery of the connecting groove 211 corresponding to the connecting groove 51, and a swing gap exists between the limiting protrusion 212 and the connecting groove 51. The driver 3 drives the transmission screw 4 to rotate, causing the screw sleeve 5 and the valve core 2 to move axially along the valve cavity. The valve core 2 moves axially relative to the valve seat 13 to have a first closed position where the core part 22 and the valve seat 13 are sealed together, and a first open position where there is an open space between the core part 22 and the valve seat 13.

[0022] This design allows the valve core and lead screw sleeve to move axially in linkage during the rotation of the transmission lead screw driven by the actuator. Simultaneously, through the swing gap between the limiting protrusion and the connecting groove, when the valve core moves to the first closed position, the core body adaptively compensates for the seal based on the position of the valve seat, correcting errors caused by machining or wear. This achieves a tight fit between the valve core and the valve seat, improving the reliability of the device. The actuator is a rotary actuator, such as a motor or rotary cylinder.

[0023] The valve seat portion 13 divides the valve cavity into an inner cavity portion 11 and an outer cavity portion 12, and the air inlet 101 and the air outlet 102 are respectively connected to the inner cavity portion 11 and the outer cavity portion 12.

[0024] This design helps to reduce the overall size of the device, while also improving the stability of the fit between the valve seat and the valve core. In this embodiment, the air inlet and outlet are positioned opposite each other.

[0025] A gas leak sensor 6 is installed inside the outer cavity 12 to detect gas leaks in the outer cavity 12.

[0026] With this setting, the gas leak sensor can detect whether there is gas leakage in the outer cavity when the valve core is in the first closed position, thereby confirming whether the valve core and valve seat are completely sealed.

[0027] In this embodiment, the gas leak sensor is connected to the PLC control unit and transmits the detection signal to the PLC control unit. Specifically, the PLC control unit can also be connected to an alarm device to remind the user when a gas leak occurs.

[0028] A position sensing element 23 is provided at the outer periphery of the valve core 2. When the valve core 2 is in the first closed position and the first open position, the position sensing element 23 is in the first sensing position and the second sensing position. A first position sensor 71 and a second position sensor 72 are respectively provided in the valve cavity at the first sensing position and the second sensing position.

[0029] This setting confirms the opening and closing position of the valve core, further improving the safety and reliability of the device. In this embodiment, both the first and second position sensors are connected to the PLC control unit.

[0030] The valve seat portion 13 includes a connecting bottom 131 integrally formed in the valve body 1 and an elastic sealing element 132 embedded in the upper end of the connecting bottom 131. When the valve core 2 is in the first closed position, the core portion 22 and the elastic sealing element 132 are tightly fitted together.

[0031] With this setting, when the gas safety valve is closed, the elastic restoring force of the elastic seal will make the fit between the valve core and the valve seat more stable, further improving safety.

[0032] The upper end of the elastic seal 132 has an upwardly protruding convex arc surface 1321 that cooperates with the core part 22.

[0033] This setting further improves the tightness of the fit between the valve core and the valve seat.

[0034] The lower end of the elastic seal 132 has a deformation groove 1322 with an inverted V-shaped cross section.

[0035] With this setting, during the downward pressing of the valve core, the lower end of the elastic seal can deform with the deformation groove, further improving the tightness of the fit between the valve core and the valve seat.

[0036] The drive mechanism also includes a first gear 81 connected to the drive end of the driver 3, a second gear 82 connected to the transmission screw 4, and a reduction gear set connected between the first gear 81 and the second gear 82, wherein the diameter of the second gear 82 is larger than that of the first gear 81.

[0037] This setting improves the accuracy of the opening and closing fit between the valve core and the valve seat, thereby amplifying the torque.

[0038] The reduction gear set includes at least four different gear shafts 83, each gear shaft 83 including a large gear section and a small gear section, and each gear shaft 83 meshes sequentially between a first gear 81 and a second gear 82 to form a reduction transmission.

[0039] This setting further improves the valve's accuracy and makes the valve's opening and closing process smoother, reducing wear on the sealing surface caused by excessive opening and closing speed and extending the valve's service life.

[0040] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A riser gas safety valve, comprising a valve body (1), a valve core (2), and a drive mechanism, wherein the valve body (1) is provided with a valve cavity and an inlet (101) and an outlet (102) communicating with the valve cavity, and a valve seat (13) is provided on the inner wall of the valve body (1) into the valve cavity, the valve seat (13) being located between the inlet (101) and the outlet (102), the valve core (2) comprising a shaft connection portion (21) and a core portion (22) forming a cooperation with the valve seat portion (13), and the drive mechanism comprising a driver (3), a transmission screw (4), and a screw sleeve (5), wherein the center of the screw sleeve (5) is connected and cooperated with the outer periphery of the transmission screw (4), characterized in that: The lead screw sleeve (5) has a connecting groove (51) around its outer circumference. The upper end of the shaft connection part (21) has a connecting groove (211) that matches the shape of the lead screw sleeve (5). The inner circumference of the connecting groove (211) has a limiting protrusion (212) corresponding to the connecting groove (51) and located within the connecting groove (51). There is a swing gap between the limiting protrusion (212) and the connecting groove (51). The driver (3) drives the transmission screw (4) to rotate, causing the screw sleeve (5) and the valve core (2) to move axially along the valve cavity. The valve core (2) moves axially relative to the valve seat (13) to have a first closed position where the core part (22) and the valve seat (13) are sealed together, and a first open position where there is an open space between the core part (22) and the valve seat (13).

2. A riser gas safety valve according to claim 1, characterized in that: The valve seat (13) divides the valve cavity into an inner cavity (11) and an outer cavity (12), and the air inlet (101) and air outlet (102) are respectively connected to the inner cavity (11) and the outer cavity (12).

3. A riser gas safety valve according to claim 2, characterized in that: A gas leak sensor (6) for detecting the external cavity (12) is provided inside the external cavity (12).

4. A riser gas safety valve according to claim 1, characterized in that: A position sensing element (23) is provided at the outer periphery of the valve core (2). When the valve core (2) is in the first closed position and the first open position, the position sensing element (23) is in the first sensing position and the second sensing position. A first position sensor (71) and a second position sensor (72) are respectively provided in the valve cavity at the first sensing position and the second sensing position.

5. A riser gas safety valve according to claim 1, characterized in that: The valve seat (13) includes a connecting bottom (131) integrally formed in the valve body (1) and an elastic sealing element (132) embedded in the upper end of the connecting bottom (131). When the valve core (2) is in the first closed position, the core part (22) and the elastic sealing element (132) are tightly fitted together.

6. A riser gas safety valve according to claim 5, characterized in that: The upper end of the elastic seal (132) has a convex arc surface (1321) that protrudes upward and forms a fit with the core part (22).

7. A riser gas safety valve according to claim 5, characterized in that: The lower end of the elastic seal (132) has a deformation groove (1322) with an inverted V-shaped cross section.

8. A riser gas safety valve according to claim 1, characterized in that: The drive mechanism also includes a first gear (81) connected to the drive end of the driver (3), a second gear (82) connected to the transmission screw (4), and a reduction gear set connected between the first gear (81) and the second gear (82), wherein the diameter of the second gear (82) is larger than that of the first gear (81).

9. A riser gas safety valve according to claim 8, characterized in that: The reduction gear set includes at least four different gear shafts (83), each gear shaft (83) including a large gear section and a small gear section, and each gear shaft (83) meshes sequentially between a first gear (81) and a second gear (82) to form a reduction transmission.

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