A locking device for a control valve for gas

Abstract

The present invention belongs to the technical field of gas control valves, and particularly relates to a locking device for a control valve for gas. A locking device for a control valve for gas includes an air pipe, a valve body, and a spherical valve body disposed in the valve body. A first air port and a corresponding main locking mechanism, a second air port and a corresponding secondary locking mechanism are sequentially arranged in the air pipe; a transmission shaft is provided at the upper end of the spherical valve body, and the main locking mechanism drives the transmission shaft to rotate to control the on-off of the first air port; the present invention can achieve hierarchical sealing of the pipeline, making the locking effect of the control valve on the pipeline better. At the same time, by utilizing the self-locking property of the worm and worm gear transmission mechanism, there is no need to set a limit stop post in the prior art, and the safety is higher; in addition, the linkage effect between the adjusting rod and the link assembly when the adjusting rod rotates can achieve the closing of the second air port, further improving the locking effect of the valve body on the pipeline and avoiding internal leakage of the spherical valve body.

Description

Technical Field

[0001] The invention belongs to the technical field of gas control valves, and particularly relates to a locking device for a control valve for gas. Background Art

[0002] The control valve for gas is a new type of safety supporting device for gas pipeline projects. It is used to cut off, connect, and regulate the gas in the pipeline, and has good control characteristics and closing and sealing performance. It is applicable to various gas medium pipelines such as city gas, liquefied petroleum gas, natural gas, and oxygen.

[0003] At present, the limit device of the traditional ball valve is to weld a limit stop column on the valve cover, and there is no locking device after limiting. A handle is installed on the valve stem. When the handle rotates, one end of the handle abuts against the limit stop to achieve the limit. After repeated operations like this, the limit column is prone to loosen and fall off. And in the absence of a position locking device, the handle is likely to change the opening and closing position of the ball valve due to accidental touch, which affects the accuracy of the opening and closing position of the ball valve and easily causes internal leakage of the ball valve (the ball valve returns after rotation); when non-operators accidentally operate the handwheel, accidents often occur; at the same time, most of the existing intelligent ball valves use some electronic control components to achieve pressure relief alarm and hierarchical sealing of the pipeline, but the electronic control components are easily damaged by external factors after long-term use, resulting in greater safety hazards for the control valve and being not conducive to practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a locking device for a control valve for gas to solve the problems raised in the above background art.

[0005] The present invention achieves the above purpose through the following technical solutions:

[0006] A locking device for a control valve for gas includes an air pipe, a valve body, and a ball valve body disposed in the valve body (2). A first air port and a corresponding main locking mechanism, a second air port and a corresponding secondary locking mechanism are sequentially arranged in the air pipe; a transmission shaft is provided at the upper end of the ball valve body. The main locking mechanism drives the transmission shaft to rotate to control the on-off of the first air port, and the transmission shaft controls the secondary locking mechanism through a connecting rod assembly, and the secondary locking mechanism is used to control the on-off of the second air port;

[0007] The main locking mechanism includes an adjusting rod that drives the transmission shaft to rotate,

[0008] The connecting rod assembly is rigidly connected to the adjusting rod through a telescopic coupling shaft;

[0009] The connecting rod assembly includes a limit seat, an L-shaped rod, and a connecting plate hinged to the end of the limit seat and rigidly connected to the shaft coupling member. Wherein, the end of the L-shaped rod is slidably inserted into the limit seat, and a spring member is provided between the end and the inner side wall of the limit seat; a connecting rod is hinged between the L-shaped rod and the connecting plate; a sealing cover body is provided on the end face of the L-shaped rod facing the second air port.

[0010] As a further optimized solution of the present invention, the main locking mechanism further includes a mounting seat, a worm wheel and a worm provided in the mounting seat and meshing with each other. The transmission shaft passes through the center of the worm wheel and supports the worm wheel. The end of the worm passes through the mounting seat and is fixedly connected with a driving wheel. The adjusting rod is rigidly connected to the side of the driving wheel to drive the driving wheel to rotate.

[0011] As a further optimized solution of the present invention, the second air port includes an outer support and an inner sliding seat connected in a sliding manner, and a damping slide rail is provided at the sliding connection of the outer support and the inner sliding seat. An exhaust hole is provided on the side of the inner sliding seat, and a through port is provided in the direction of the inner sliding seat facing the sealing cover body.

[0012] As a further optimized solution of the present invention, both the main locking mechanism and the secondary locking mechanism are arranged in the upper valve seat on the valve body, and the upper valve seat is internally communicated with the trachea.

[0013] As a further optimized solution of the present invention, the shaft coupling member includes an L-shaped sliding rod and a limit plate member connected in a sliding manner. A limit column is fixedly provided at the sliding end of the L-shaped sliding rod, and a kidney-shaped hole for sliding with the limit column is provided on the limit plate member.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1) The present invention can achieve hierarchical sealing of the pipeline, making the locking effect of the control valve on the pipeline better. At the same time, taking advantage of the self-locking property of the worm and worm gear transmission mechanism, when the adjusting rod stops being toggled, the position of the ball valve body is locked, and there is no need to set a limit stop post in the prior art, which is safer; in addition, the linkage effect between the adjusting rod and the connecting rod assembly during rotation can achieve the closing of the second air port, further improving the locking effect of the valve body on the pipeline and avoiding internal leakage of the ball valve body.

[0016] 2) Compared with most existing intelligent ball valves that use some electronic control components to achieve pressure relief alarm and hierarchical sealing of the pipeline, this application uses a pure mechanical transmission structure to achieve hierarchical locking of the pipeline. It is not easily affected by external factors during long-term use, has a longer service life, lower cost, reduces potential safety hazards, and is obviously more conducive to practical applications. Description of the Drawings

[0017] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the sectional structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the internal structure of the mounting seat of the present invention;

[0020] Figure 4 It is a schematic diagram of the structure at the connection of the coupling shaft and the connecting rod assembly of the present invention;

[0021] Figure 5 It is a schematic diagram of the telescopic assembly of the present invention;

[0022] Figure 6 It is a schematic diagram of the coupling shaft member of the present invention.

[0023] In the figure: 1. Air pipe; 2. Valve body; 3. Upper valve seat; 4. Transmission shaft; 5. Ball valve body; 6. First air port; 7. Second air port; 31. Adjusting rod; 32. Mounting seat; 33. Worm; 34. Worm gear; 35. Driving wheel; 36. Coupling shaft member; 37. Connecting rod assembly; 71. Outer support; 72. Inner sliding seat; 73. Damping slide rail; 74. Exhaust hole; 75. Through port; 361. L-shaped slide rod; 362. Limiting plate member; 363. Waist-shaped hole; 364. Limiting column; 371. Limiting seat; 372. L-shaped rod member; 373. Spring member; 374. Connecting plate; 375. Connecting rod; 376. Sealing cover body. Detailed implementation manners

[0024] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0025] Embodiment 1

[0026] As Figures 1-5 shown, a locking device for a control valve for gas use includes an air pipe 1, a valve body 2, and a ball valve body 5 provided in the valve body 2. A first air port 6 and a corresponding main locking mechanism, and a second air port 7 and a corresponding secondary locking mechanism are sequentially provided in the air pipe 1; a transmission shaft 4 is provided at the upper end of the ball valve body 5. The main locking mechanism drives the transmission shaft 4 to rotate to control the on-off of the first air port 6, and the transmission shaft 4 drives the secondary locking mechanism through the connecting rod assembly 37. The secondary locking mechanism is used to control the on-off of the second air port 7;

[0027] The main locking mechanism includes an adjusting rod 31 that drives the transmission shaft 4 to rotate. During use, the adjusting rod 31 is rotated to drive the transmission shaft 4 to rotate, thereby driving the ball valve body 5 to rotate to control the on-off of the first air port 6;

[0028] The connecting rod assembly 37 is rigidly connected to the adjusting rod 31 through the telescopic coupling shaft 36. In this way, when the adjusting rod 31 rotates, the coupling shaft 36 also rotates simultaneously, which can drive the connecting rod assembly 37 to work.

[0029] The connecting rod assembly 37 includes a limit seat 371, an L-shaped rod 372, and a connecting plate 374 hinged to the end of the limit seat 371 and rigidly connected to the coupling shaft 36. Among them, the end of the L-shaped rod 372 is slidably inserted into the limit seat 371, and a spring member 373 is provided between the end and the inner side wall of the limit seat 371; a connecting rod 375 is hinged between the L-shaped rod 372 and the connecting plate 374; a sealing cover 376 is provided on the end face of the L-shaped rod 372 facing the second air port 7.

[0030] As Figure 4 shown, when the connecting rod assembly 37 works, the downward pressure of the adjusting rod 31 drives the left end of the telescopic coupling shaft 36 to rotate along its radial direction. The connecting plate 374 also rotates clockwise under the rotation of the coupling shaft 36. Thus, under the action of the connecting rod 375, the L-shaped rod 372 will slide to the right to compress the spring member 373, so as to realize the pressing of the sealing cover 376 on the second air port 7, realize the on-off control of the second air port 7, and can realize the hierarchical sealing of the pipeline, making the locking effect of the control valve on the pipeline better.

[0031] Specifically, the main locking mechanism further includes a mounting seat 32, a worm gear 34 and a worm 33 meshing with each other in the mounting seat 32. The transmission shaft 4 passes through the center of the worm gear 34 and supports the worm gear 34. The end of the worm 33 passes through the mounting seat 32 and is fixedly connected with a driving wheel 35. The adjusting rod 31 is rigidly connected to the side of the driving wheel 35 to drive the driving wheel 35 to rotate.

[0032] At present, the limiting device of the traditional ball valve is to weld a limiting stop column on the valve cover, and there is no locking device after limiting. A handle is installed on the valve stem. When the handle rotates, one end of the handle abuts against the limiting stop to achieve limiting. After repeated operations like this, the limiting column is easy to loosen and fall off. And in the case of lack of a position locking device, the handle is easy to change the opening and closing position of the ball valve due to accidental touching. These all affect the accuracy of the opening and closing position of the ball valve and are likely to cause internal leakage of the ball valve (the ball valve rotates and then resets); when non-operators accidentally operate the handwheel, accidents often occur. In view of the above defects, when the adjusting rod 31 is rotated to control, the driving wheel 35 is driven to rotate. Since the worm 33 and the driving wheel 35 are integrally arranged, when the worm 33 rotates, the meshing worm gear 34 also rotates. Based on the concentric setting of the worm gear 34 and the transmission shaft 4, when the adjusting rod 31 is toggled, the transmission shaft 4 can also rotate synchronously. Here, the self-locking property of the worm and worm gear transmission mechanism is utilized in this application. When the adjustment of the adjusting rod 31 stops, the position of the ball valve body 5 is locked. Compared with the prior art, there is no need to set a limiting stop column, and the safety is higher.

[0033] Furthermore, when the pipeline needs to be cut off in this application, toggling the adjusting rod 31 drives the above-mentioned main locking mechanism to work, that is, the closing of the first air port 6 is realized. At the same time, when the adjusting rod 31 rotates, due to the linkage effect of the above-mentioned connecting rod assembly 37, the closing of the second air port 7 can be realized, which further improves the locking effect of the valve body on the pipeline and avoids internal leakage of the spherical valve body 5.

[0034] Specifically, the second air port 7 includes an outer support 71 and an inner sliding seat 72 that are slidably connected. A damping slide rail 73 is provided at the sliding connection of the outer support 71 and the inner sliding seat 72. An exhaust hole 74 is provided on the side of the inner sliding seat 72, and a through port 75 is provided in the direction of the inner sliding seat 72 facing the sealing cover body 376.

[0035] In this application, the through port 75 is the main gas passage of the second air port 7. When the sealing cover body 376 presses on the second air port 7, the inner sliding seat 72 will slide along the outer support 71. Due to the setting of the damping slide rail 73, it can play a certain buffering role in the pressing process of the second air port 7. At the same time, due to the setting of the exhaust hole 74, while the inner sliding seat 72 slides slowly, since the sealing cover body 376 has pressed on the through port 75, the exhaust hole 74 can assist in ventilation. The on-off state of the above-mentioned second air port 7 is applied when the pipeline needs to be semi-opened.

[0036] Specifically, both the main locking mechanism and the secondary locking mechanism are arranged in the upper valve seat 3 on the valve body 2, and the upper valve seat 3 is internally communicated with the trachea 1.

[0037] Specifically, the coupling member 36 includes an L-shaped slide rod 361 and a limit plate member 362 that are slidably connected. A limit post 364 is fixedly provided at the sliding end of the L-shaped slide rod 361, and a waist-shaped hole 363 for the limit post 364 to slide is provided on the limit plate member 362. When the connecting rod assembly 37 works, the left end of the telescopic coupling member 36 is driven to rotate radially by the downward pressure of the adjusting rod 31. During this process, the limit post 364 slides in the waist-shaped hole 363.

[0038] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A locking device for a control valve for gas, comprising an air pipe (1), a valve body (2), and a spherical valve body (5) disposed within the valve body (2). Characterized in that: A first air port (6) and a corresponding main locking mechanism, a second air port (7) and a corresponding secondary locking mechanism are sequentially provided within the air pipe (1); a transmission shaft (4) is provided at the upper end of the spherical valve body (5), the main locking mechanism drives the transmission shaft (4) to rotate to control the on / off of the first air port (6), the transmission shaft (4) controls the secondary locking mechanism through a link assembly (37), and the secondary locking mechanism is used to control the on / off of the second air port (7); The main locking mechanism includes an adjusting rod (31) that drives the transmission shaft (4) to rotate. The link assembly (37) is rigidly connected to the adjusting rod (31) through a telescopic coupling member (36). The link assembly (37) includes a limit seat (371), an L-shaped rod member (372), and a connecting plate (374) hinged to the end of the limit seat (371) and rigidly connected to the coupling member (36). Among them, the end of the L-shaped rod member (372) is slidably inserted into the limit seat (371), and a spring member (373) is provided between the end and the inner side wall of the limit seat (371); a connecting rod (375) is hinged between the L-shaped rod member (372) and the connecting plate (374); a sealing cover body (376) is provided on the end face of the L-shaped rod member (372) facing the second air port (7). The second air port (7) includes an outer support (71) and an inner sliding seat (72) that are slidably connected, and a damping slide rail (73) is provided at the sliding connection of the outer support (71) and the inner sliding seat (72). An exhaust hole (74) is provided on the side of the inner sliding seat (72), and a through port (75) is provided on the inner sliding seat (72) in the direction facing the sealing cover body (376).

2. The locking device for a control valve for gas according to claim 1, Characterized in that: The main locking mechanism further includes a mounting seat (32), a worm gear (34) and a worm (33) disposed within the mounting seat (32) and meshing with each other. The transmission shaft (4) passes through the center of the worm gear (34) and supports the worm gear (34). The end of the worm (33) passes through the mounting seat (32) and is fixedly connected to a driving wheel (35). The adjusting rod (31) is rigidly connected to the side of the driving wheel (35) to drive the driving wheel (35) to rotate.

3. The locking device for a control valve for gas according to claim 1, Characterized in that: Both the main locking mechanism and the secondary locking mechanism are disposed within an upper valve seat (3) on the valve body (2), and the upper valve seat (3) is internally connected to the air pipe (1).

4. The locking device for a control valve for gas according to claim 1, Characterized in that: The coupling member (36) includes an L-shaped sliding rod (361) and a limiting plate member (362) that are slidably connected. A limiting post (364) is fixedly provided at the sliding end of the L-shaped sliding rod (361), and a waist-shaped hole (363) for slidingly engaging with the limiting post (364) is formed in the limiting plate member (362).

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