Pneumatic quick-closing valve

Abstract

The utility model discloses a pneumatic quick-closing valve which comprises a valve seat, a valve lead screw, a driving hand wheel and a quick-closing handle structure, the valve lead screw capable of being driven by the driving hand wheel to rotate is arranged in the valve seat, and the valve seat is further provided with the quick-closing handle structure for controlling the valve lead screw to be quickly closed. The driving hand wheel and the valve lead screw are provided with a control valve lead screw through a reduction gearbox, the top of the reduction gearbox is provided with an air cylinder executing mechanism, and the output end of the air cylinder executing mechanism is provided with an executing shaft which penetrates through the interior of the valve lead screw and can move in the valve lead screw. According to the pneumatic quick-closing valve, the air cylinder executing mechanism is installed through the reduction gearbox, when the air cylinder executing mechanism is driven, related structures driven manually are in an empty stagnation state, air intake and exhaust of the air cylinder executing mechanism need to be smooth during manual driving, a plug pin structure is moved away through manual and pneumatic switching, and work of a quick-closing handle structure is not affected; remote pneumatic control on-off and on-site manual on-off can be achieved, and the quick-off function is further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of a quick-closing valve. Background Art

[0002] The quick-closing valve is usually composed of a valve body and a cylinder. Under normal circumstances, the opening of the valve is achieved by the oil pressure in the cylinder overcoming the spring force. When the oil pressure drops, the spring will quickly push the valve to close within a certain period of time. Manual quick-closing valves are widely used in important places where pipelines or other systems need to be quickly cut off, such as the main closing mechanism between the new steam network and the steam turbine, and the valve used to cut off the steam inlet of the steam turbine in an emergency.

[0003] The manual quick-closing valve needs to be operated manually and cannot have the functions of remote automatic switch, manual switch and on-site quick switch at the same time. In order to enable it to have the above three functions at the same time, adapt to more operating environments and meet greater market demand, it is necessary to propose a quick-closing valve that can be remotely pneumatically controlled and manually switched on-site, and also has a quick-closing function. Utility Model Content

[0004] The utility model aims to provide a pneumatic quick-closing valve to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A pneumatic quick-closing valve, comprising a valve seat, a valve screw, a driving hand wheel and a quick-closing handle structure, wherein a valve screw that can be driven to rotate by the driving hand wheel is located inside the valve seat, and the valve seat is also provided with a quick-closing handle structure for controlling the valve screw to quickly close the valve, the driving hand wheel is installed with the valve screw through a reduction box to control the valve screw, a cylinder actuator is provided on the top of the reduction box, and an actuator shaft that penetrates the inside of the valve screw and can move inside the valve screw is installed at the output end of the cylinder actuator;

[0007] The reduction box includes a housing, a worm wheel and a worm, wherein a worm wheel threadedly connected to the valve screw rod is rotatably installed in the housing, a worm engaged with the worm wheel is rotatably installed in the housing, and one end of the worm is fixedly installed with a driving hand wheel;

[0008] The valve screw rod and the actuator shaft are provided with pin holes, and the plug pin passes through the pin holes of the valve screw rod and the actuator shaft to fix the valve screw rod and the actuator shaft.

[0009] As a further solution of the utility model: the worm wheel is provided with a secondary wheel which is coaxial with the worm wheel and protrudes, and the secondary wheel is rotatably connected to the reduction box through a bearing.

[0010] As a further solution of the utility model: the cylinder actuator is provided with a pneumatic system;

[0011] The pneumatic system includes a main air pipe, an intake pipeline, an exhaust pipeline, an intake control valve and an exhaust control valve. The main air pipe is installed with two intake pipelines through the intake control valve. The two intake pipelines are respectively connected to the two air ports of the cylinder actuator. An exhaust pipeline is connected between the two intake pipelines, and an exhaust control valve is arranged on the exhaust pipeline.

[0012] As a further solution of the utility model: the cylinder actuator is a double-acting cylinder, the intake pipeline controls the single pipeline to intake air into the cylinder actuator through the intake control valve, and the other end of the cylinder actuator is controlled by the exhaust control valve to open the channel for exhaust.

[0013] As a further solution of the utility model: a main valve is arranged on the main air pipe.

[0014] As a further solution of the utility model: a power shaft that can slide up and down is installed at the bottom of the valve seat, and the power shaft is fixedly connected to the execution shaft.

[0015] As a further solution of the utility model: a threaded travel contact is installed on the valve screw rod, and a travel switch located below the travel contact is installed on the valve seat.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The pneumatic quick-closing valve is installed with a cylinder actuator through a reduction box, so that the cylinder actuator is manually driven and the related structure is in an air-delayed state when driven. When manually driven, the air intake and exhaust of the cylinder actuator need to be unobstructed. The switching between manual and pneumatic removes the latch structure without affecting the operation of the quick-closing handle structure, realizing remote pneumatic control switching and on-site manual switching, and also having the function of quick closing.

[0018] 2. The pneumatic quick-closing valve controls the air flow into the designated air chamber of the cylinder actuator or discharges it from the designated air path by switching the air intake control valve and the exhaust control valve, thereby driving the cylinder actuator to work reciprocatingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural stereogram of a pneumatic quick-closing valve;

[0020] Figure 2 This is a structural front view of a pneumatic quick-closing valve;

[0021] Figure 3 It is a structural cross-sectional diagram of a pneumatic quick-closing valve;

[0022] Figure 4The figure is a schematic diagram of the structure of a reduction gearbox in a pneumatic quick-closing valve.

[0023] Figure 5 This is a diagram of the pneumatic system in a pneumatic quick-closing valve.

[0024] In the figure: 1. Cylinder actuator; 2. Reducer; 201. Housing; 202. Bearing; 203. Worm gear; 204. Auxiliary gear; 205. Worm; 3. Valve screw; 4. Power shaft; 5. Exhaust control valve; 6. Intake control valve; 7. Driving hand wheel; 8. Travel switch; 9. Main valve; 10. Actuator shaft; 11. Exhaust pipeline; 12. Quick-closing handle structure; 13. Intake pipeline. DETAILED DESCRIPTION

[0025] See also Figures 1 to 4 In the embodiment of the utility model, a pneumatic quick-closing valve includes a valve seat, a valve screw rod 3, a driving hand wheel 7 and a quick-closing handle structure 12. The valve seat is provided with a valve screw rod 3 that can be driven to rotate by the driving hand wheel 7. The valve seat is also provided with a quick-closing handle structure 12 for controlling the valve screw rod 3 to quickly close the valve. The driving hand wheel 7 is installed with the valve screw rod 3 through a reduction box 2 to control the valve screw rod 3. A cylinder actuator 1 is provided on the top of the reduction box 2. An actuator shaft 10 that penetrates through the valve screw rod 3 and can move in the valve screw rod 3 is installed at the output end of the cylinder actuator 1. The valve seat, valve screw rod 3, driving hand wheel 7 and quick-closing handle structure 12 of the quick-closing valve are all prior art, which is the existing structure of the existing quick-closing valve. On its basis, a cylinder actuator 1 is added for remote driving. The gas source can use the steam pressure on site to reduce construction costs.

[0026] The reduction box 2 includes a housing 201, a worm wheel 203 and a worm 205. The housing 201 is rotatably provided with a worm wheel 203 threadedly connected to the valve screw 3. The housing 201 is rotatably provided with a worm 205 meshing with the worm wheel 203. One end of the worm 205 is fixedly installed with a driving hand wheel 7. When the cylinder actuator 1 is driven, in order to retain the manual function of the original site, a reduction box 2 is added on its basis. The reduction box 2 has two functions. One function is to leave enough installation space for the cylinder actuator 1 to meet the design requirements of the cylinder actuator 1. The second function is that the structure of the worm wheel and worm has a self-locking function. During operation, the worm 205 drives the worm wheel 203 to rotate, and the rotation of the worm wheel 203 drives the valve screw 3 connected with the internal thread to move up and down.

[0027] Pin holes are provided on the valve screw rod 3 and the actuator shaft 10, and the pin passes through the pin holes of the valve screw rod 3 and the actuator shaft 10 to fix the valve screw rod 3 and the actuator shaft 10. When the pin is not fixed, the cylinder actuator 1 directly drives the actuator shaft 10 to operate, and the reduction box 2 is in a stagnant state and does not affect each other. When manual operation is required, the air valve of the cylinder actuator 1 is opened, and the pin passes through the pin hole of the valve screw rod 3 and the actuator shaft 10 to fix the valve screw rod 3 and the actuator shaft 10. At this time, the valve screw rod 3 cannot rotate. Under the condition of the rotation of the worm gear 203, the valve screw rod 3 drives the actuator shaft 10 to move, thereby realizing remote pneumatic control switching and on-site manual switching, and also has the function of quick closing.

[0028] As a further solution of the utility model: a secondary wheel 204 is provided on the worm wheel 203, which is cocentric with the worm wheel 203 and protrudes. The secondary wheel 204 is rotatably connected to the reduction box 2 through a bearing 202. The worm wheel 203 is a core component of the reduction box 2 and needs to rotate smoothly. Therefore, the secondary wheel 204 is provided on the top or bottom or both the top and the bottom of the worm wheel 203, and the secondary wheel 204 is assembled through the bearing 202, which can effectively improve its stability during operation.

[0029] See also Figures 1 to 5 , in the embodiment of the utility model, as a further solution of the utility model: the cylinder actuator 1 is provided with a pneumatic system;

[0030] The pneumatic system includes a main air pipe, an air intake pipeline 13, an exhaust pipeline 11, an air intake control valve 6 and an exhaust control valve 5. Two air intake pipelines 13 are installed on the main air pipe through the air intake control valve 6. The two air intake pipelines 13 are respectively connected to the two air ports of the cylinder actuator 1. An exhaust pipeline 11 is connected between the two air intake pipelines 13. The exhaust pipeline 11 is provided with an exhaust control valve 5. The pneumatic system is the key to driving the cylinder actuator 1. The main air pipe is connected to the air source. A main valve 9 is provided on the main air pipe. The input of the air source is controlled by the main valve 9. The air intake control valve 6 distributes it. The air intake control valve 6 is remotely driven to enable it to send the air flow into the double-acting cylinder. The other side needs to be exhausted to release the compressed air pressure, which is controlled by the exhaust control valve 5 for exhaust. During manual driving, the exhaust control valve 5 is fully opened and the air intake control valve 6 is closed.

[0031] As a further solution of the utility model: the cylinder actuator 1 is a double-acting cylinder, the intake pipeline 13 controls the single pipeline to intake air into the cylinder actuator 1 through the intake control valve 6, and the other end of the cylinder actuator 1 controls the opening of the channel for exhaust through the exhaust control valve 5. The reciprocating motion operation of the cylinder actuator 1 is realized by switching the intake control valve 6 and the exhaust control valve 5.

[0032] As a further solution of the utility model: a power shaft 4 which can slide up and down is installed at the bottom of the valve seat, the power shaft 4 is fixedly connected to the actuator shaft 10, and the power shaft 4 is connected to the valve body, which is relatively convenient during maintenance and switching, and can be directly replaced, thereby improving maintenance efficiency.

[0033] As a further solution of the utility model: a threaded travel contact is installed on the valve screw rod 3, and a travel switch 8 located below the travel contact is installed on the valve seat. Usually, the driving stroke of the cylinder actuator 1 does not match the stroke of the valve switch, resulting in the valve core colliding with the pipe wall. Therefore, adding the travel switch 8 can effectively increase the operating distance of the cylinder actuator 1, even if the main valve 9, the intake control valve 6 and the exhaust control valve 5 are closed or switched.

[0034] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference can be made to the description in other embodiments.

[0035] The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A pneumatic quick-closing valve, comprising a valve seat, a valve screw (3), a driving hand wheel (7) and a quick-closing handle structure (12), wherein the valve seat has a valve screw (3) which can be driven to rotate by the driving hand wheel (7), and the valve seat is also provided with a quick-closing handle structure (12) for controlling the valve screw (3) to quickly close the valve, characterized in that: The driving hand wheel (7) is installed to control the valve screw (3) through the reduction box (2) and the valve screw (3); a cylinder actuator (1) is arranged on the top of the reduction box (2); an actuator shaft (10) is installed at the output end of the cylinder actuator (1) and passes through the inside of the valve screw (3) and is movable in the valve screw (3); The reduction box (2) comprises a housing (201), a worm wheel (203) and a worm (205); the housing (201) has a worm wheel (203) threadedly connected to the valve screw (3) rotatably mounted therein; the housing (201) has a worm wheel (205) meshing with the worm wheel (203) rotatably mounted therein; one end of the worm wheel (205) is fixedly mounted to a driving hand wheel (7); The valve screw rod (3) and the actuator shaft (10) are provided with pin holes, and the plug pin passes through the pin holes of the valve screw rod (3) and the actuator shaft (10) to fix the valve screw rod (3) and the actuator shaft (10).

2. A pneumatic quick closing valve according to claim 1, characterized in that: The worm wheel (203) is provided with a secondary wheel (204) which is coaxial with the worm wheel (203) and protrudes, and the secondary wheel (204) is rotatably connected to the reduction box (2) via a bearing (202).

3. A pneumatic quick closing valve according to claim 1, characterized in that: The cylinder actuator (1) is provided with a pneumatic system; The pneumatic system comprises a main air pipe, an air intake pipeline (13), an exhaust pipeline (11), an air intake control valve (6) and an exhaust control valve (5); the main air pipe is provided with two air intake pipelines (13) via the air intake control valve (6); the two air intake pipelines (13) are respectively connected to two air ports of a cylinder actuator (1); an exhaust pipeline (11) is connected between the two air intake pipelines (13); and the exhaust pipeline (11) is provided with an exhaust control valve (5).

4. A pneumatic quick closing valve according to claim 3, characterized in that: The cylinder actuator (1) is a double-acting cylinder. The air intake pipeline (13) controls a single pipeline to intake air into the cylinder actuator (1) through an air intake control valve (6). The other end of the cylinder actuator (1) is controlled by an exhaust control valve (5) to open a channel for exhaust.

5. The pneumatic quick closing valve according to claim 3, characterized in that: The main air pipe is provided with a main valve (9).

6. A pneumatic quick closing valve according to any one of claims 1 to 5, characterized in that: A power shaft (4) that can slide up and down is installed at the bottom of the valve seat, and the power shaft (4) is fixedly connected to the actuator shaft (10).

7. The pneumatic quick closing valve according to claim 1, characterized in that: A threaded travel contact is mounted on the valve screw rod (3), and a travel switch (8) located below the travel contact is mounted on the valve seat.

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