Automatic closing device of pneumatic butterfly valve

Abstract

The utility model provides an automatic closing device for a pneumatic butterfly valve, which relates to the field of valves and comprises a valve body and an execution unit, a flow sensor is fixedly mounted above the valve body, a signal input end of the flow sensor is connected and communicated with a detection unit, the detection unit is arranged on one side of an inlet of the valve body, and the flow sensor is in control connection with the execution unit. The execution unit comprises a gear concentric with the valve body and the valve rod, the outer side of the gear is meshed with a single-face rack frame, and the side, provided with teeth, of the single-face rack frame is attached to the gear. According to the automatic closing device of the pneumatic butterfly valve, the external flow sensor is used for detecting the flow speed of fluid passing through the valve body, the preset flow speed threshold value is used for generating a signal for driving the electromagnetic reversing valve to work, and therefore the valve body can be closed through air pressure; the problem that a detection device is arranged in a valve body of an existing valve, and the corresponding flow speed is not easy to adjust is solved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an automatic shut-off device for a pneumatic butterfly valve. Background Technology

[0002] The pneumatic butterfly valve automatic closing device disclosed in Chinese patent CN209278506U includes a pneumatic actuator, a valve body, a valve stem, a butterfly plate, and an air inlet pipe. The pneumatic actuator is equipped with a solenoid valve, which is a three-way solenoid valve. One end of the air inlet pipe is connected to the inlet of the solenoid valve, and the other end is connected to a pipe inside the valve body. The air inlet pipe is equipped with a regulating valve for adjusting the flow rate of gas entering the pneumatic actuator through the air inlet pipe. The two outlets of the solenoid valve are respectively connected to the two air inlets of the pneumatic actuator to control the opening and closing of the pneumatic butterfly valve. A pressure sensor is installed on the inner wall of the valve body in front of the butterfly plate along the airflow direction during use. The pressure sensor is electrically connected to a controller, and the controller is electrically connected to the solenoid valve.

[0003] This pneumatic butterfly valve can automatically close in the event of an unexpected power outage in the processing equipment, and its opening and closing can be adjusted according to the airflow pressure in the pipeline. However, this technical solution places the pressure detection unit inside the valve body, making subsequent maintenance and adjustment of the detection threshold quite difficult. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an automatic shut-off device for a pneumatic butterfly valve, which solves the problems mentioned in the background art.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic closing device for a pneumatic butterfly valve, comprising a valve body and an execution unit. A flow sensor is fixedly installed on the top of the valve body. The signal input end of the flow sensor is connected to and passes through a detection unit, which is located on the inlet side of the valve body. The flow sensor is controlled and connected to the execution unit. The execution unit includes a gear concentric with the valve stem of the valve body. A single-sided rack frame meshes with the outer side of the gear. The toothed side of the single-sided rack frame is in contact with the gear. Pneumatic pistons are fixedly installed on both sides of the single-sided rack frame parallel to the tooth distribution. An air inlet pipe is connected to and passes through the ends of the pneumatic pistons that are far apart from each other. The two air inlet pipes are connected and pass through an electromagnetic reversing valve. An air supply pipe is connected to and passes through the air inlet end of the electromagnetic reversing valve. The signal input end of the flow sensor is controlled and connected to the control end of the electromagnetic reversing valve.

[0007] Furthermore, a gas storage cylinder is fixedly installed above the valve body. The capacity of the gas storage cylinder is at least twice the capacity of the pneumatic piston. The output end of the gas storage cylinder is connected to and passes through the gas supply pipe. The inlet end of the gas storage cylinder is located at the top. A one-way valve is connected to and passes through the inlet end of the gas storage cylinder. A sealing gasket is slidably connected inside the gas storage cylinder. A through hole is opened on the side of the gas storage cylinder away from the output end for inserting a device to push the sealing gasket to move.

[0008] Furthermore, an exhaust port is provided above the fixed end of the pneumatic piston, and a sliding sealing mechanism is provided inside the exhaust port. A connecting ring with a vent hole is sleeved on the outer surface of the sliding sealing mechanism. A baffle that obstructs ventilation is slidably connected in the middle of the connecting ring. The baffle and the connecting ring are fixedly connected by an air bladder and a return spring. The input end of the air bladder is connected and communicates with the air inlet end of the pneumatic piston on the other side.

[0009] Furthermore, the execution unit includes a housing, which is fixedly mounted on the outer surface of the valve body, a gear is rotatably connected inside the housing, a single-sided rack frame is slidably connected to the housing, and the fixed end of the pneumatic piston is fixedly connected to the housing.

[0010] Furthermore, a stepped lower fixing ring is fixedly installed on the outer surface of the connecting ring, an upper fixing ring is fixedly installed on the outer surface of the retaining sleeve, the airbag is located inside the return spring, and the control tube of the airbag extends out from below the return spring.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This pneumatic butterfly valve automatic closing device uses an external flow sensor to detect the fluid velocity passing through the valve body and generates a signal to drive the solenoid directional valve by setting a preset flow velocity threshold. This allows the valve body to be closed using air pressure, solving the problem that existing valves have the detection device inside the valve body, making it difficult to adjust the corresponding flow velocity.

[0013] 2. The automatic closing device of this pneumatic butterfly valve has a gas storage cylinder fixedly installed on the top of the valve body. The capacity of the gas storage cylinder is at least twice the capacity of the pneumatic piston. The output end of the gas storage cylinder is connected to and passes through the gas supply pipe. The inlet end of the gas storage cylinder is located at the top and is connected to and passes through a one-way valve. A sealing gasket is slidably connected inside the gas storage cylinder. A through hole is opened on the side of the gas storage cylinder away from the output end for inserting the device to push the sealing gasket to move. By setting the gas storage cylinder, a certain amount of gas can be temporarily stored for manual operation to discharge the gas in the gas storage cylinder after the gas supply stops or the power is cut off, so as to achieve the effect of manual closing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection of the gas storage cylinder of this utility model;

[0016] Figure 3 This is a schematic diagram of the gear connection of this utility model;

[0017] Figure 4 This is a schematic diagram of the exhaust port connection of this utility model.

[0018] The components are as follows: 1. Valve body; 2. Actuation unit; 3. Flow sensor; 4. Detection unit; 201. Gear; 202. Single-sided rack frame; 203. Pneumatic piston; 204. Inlet pipe; 205. Solenoid directional valve; 206. Air supply pipe; 207. Housing; 5. Air storage cylinder; 6. One-way valve; 7. Sealing gasket; 8. Through hole; 9. Exhaust port; 10. Sliding sealing mechanism; 11. Connecting ring; 12. Sleeve; 13. Airbag; 14. Return spring; 15. Lower fixing ring; 16. Upper fixing ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figure 1-4 An automatic closing device for a pneumatic butterfly valve includes a valve body 1 and an actuator 2. A flow sensor 3 is fixedly installed on the top of the valve body 1. The signal input end of the flow sensor 3 is connected to and passes through a detection unit 4, which is located on the inlet side of the valve body 1. The flow sensor 3 is controlled and connected to the actuator 2. The actuator 2 includes a gear 201 concentric with the valve stem of the valve body 1. A single-sided rack frame 202 meshes with the outer side of the gear 201. The toothed side of the single-sided rack frame 202 is in contact with the gear 201. The two sides of the single-sided rack frame 202 parallel to the tooth distribution are fixed respectively. A pneumatic piston 203 is installed, with one end of the pneumatic piston 203 being connected to and passing through an air inlet pipe 204. The two air inlet pipes 204 are connected and passing through an electromagnetic reversing valve 205. The air inlet end of the electromagnetic reversing valve 205 is connected to and passing through an air supply pipe 206. The signal input end of the flow sensor 3 is connected to the control end of the electromagnetic reversing valve 205. An external flow sensor 3 is used to detect the fluid flow rate passing through the valve body 1. A preset flow rate threshold is used to generate a signal to drive the electromagnetic reversing valve 205 to work, thereby enabling the valve body 1 to be closed using air pressure.

[0021] A gas cylinder 5 is fixedly installed on the top of the valve body 1. The capacity of the gas cylinder 5 is at least twice the capacity of the pneumatic piston 203. The output end of the gas cylinder 5 is connected to and passes through the gas supply pipe 206. The inlet end of the gas cylinder 5 is located at the top. A one-way valve 6 is connected to and passes through the inlet end of the gas cylinder 5. A sealing gasket 7 is slidably connected inside the gas cylinder 5. A through hole 8 is opened on the side of the gas cylinder 5 away from the output end for inserting a device to push the sealing gasket 7 to move. By setting the gas cylinder 5, a certain amount of gas can be temporarily stored for manual operation to discharge the gas in the gas cylinder 5 after the gas supply stops or the power is cut off, so as to achieve the effect of manual closure.

[0022] An exhaust port 9 is provided above the fixed end of the pneumatic piston 203. A sliding sealing mechanism 10 is provided inside the exhaust port 9. The sliding sealing mechanism 10 consists of a sealing boss and a return spring 14. Under the action of air pressure, the boss is pushed up, and the exhaust port 9 is opened to exhaust air. A connecting ring 11 with a vent hole is sleeved on the outer surface of the sliding sealing mechanism 10. A baffle 12 that obstructs air passage is slidably connected in the middle of the connecting ring 11. The baffle 12 and the connecting ring 11 are fixedly connected by an air bag 13 and a return spring 14. The input end of the air bag 13 is connected and communicates with the air inlet end of the pneumatic piston 203 on the other side. When supplying air, the opposite air bag 13 is first filled, the baffle 12 moves up, the vent hole of the connecting ring 11 is opened, and the pneumatic piston 203 on the other side can exhaust air and contract, thus avoiding the valve plate from rotating automatically due to fluid impact.

[0023] The actuator 2 includes a housing 207, which is fixedly installed on the outer surface of the valve body 1. A gear 201 is rotatably connected inside the housing 207. A single-sided rack frame 202 is slidably connected to the housing 207. The fixed end of the pneumatic piston 203 is fixedly connected to the housing 207. The exhaust port 9 extends to the outside of the housing 207, and the exhaust port 9 can be separated from the pneumatic piston 203 by external force. With this configuration, manual adjustment and closure can be achieved by destroying the exhaust port 9.

[0024] A stepped lower fixing ring 15 is fixedly installed on the outer surface of the connecting ring 11, and an upper fixing ring 16 is fixedly installed on the outer surface of the retaining sleeve 12. The airbag 13 is located inside the reset spring 14, and the control tube of the airbag 13 extends from below the reset spring 14. This arrangement enables the airbag 13 to achieve automatic reset.

[0025] In use, an external flow sensor 3 is set to detect the fluid flow rate through the valve body 1, and a preset flow rate threshold is used to generate a signal to drive the solenoid directional valve 205 to work, so that the valve body 1 can be closed by air pressure.

[0026] Gas is supplied to the gas cylinder 5 through the gas supply mechanism, and part of the gas is temporarily stored. The remaining gas enters the interior of the pneumatic piston 203 through the air inlet pipe 204 and the solenoid reversing valve 205. When the flow direction sensor detects a threshold signal that it needs to be automatically closed, it sends a signal to the solenoid reversing valve 205. The solenoid reversing valve 205 switches the gas supply direction and supplies gas to the pneumatic piston 203 on the other side. At the same time, it supplies gas to the air bag 13 on the other side. After the air bag 13 is supplied with gas, it expands and drives the baffle 12 to move upward. At this time, the connecting ring 11 can exhaust gas. At the same time, the pneumatic piston 203 on the other side unfolds and drives the single-sided rack frame 202 to move, thereby driving the valve body 1 to close.

[0027] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pneumatically operated butterfly valve automatic closing device, comprising a valve body (1) and an execution unit (2), characterized in that: The upper side of the valve body (1) is fixedly installed with a flow sensor (3), the signal input end of the flow sensor (3) is connected and penetrates a detection unit (4), the detection unit (4) is arranged on the inlet side of the valve body (1), and the flow sensor (3) is in control connection with an execution unit (2); The execution unit (2) comprises a gear (201) concentric with the valve stem of the valve body (1), the outer side of the gear (201) is engaged with a single-sided rack frame (202), one side of the single-sided rack frame (202) with teeth is attached to the gear (201), and the two sides of the single-sided rack frame (202) parallel to the tooth distribution are fixedly installed with pneumatic pistons (203), respectively. The ends of the pneumatic pistons (203) away from each other are connected and penetrated by an air inlet pipe (204), the two air inlet pipes (204) are connected and penetrated by an electromagnetic reversing valve (205), the air inlet end of the electromagnetic reversing valve (205) is connected and penetrated by a gas supply pipe (206), and the signal input end of the flow sensor (3) is in control connection with the control end of the electromagnetic reversing valve (205).

2. The automatic closure device for a pneumatic butterfly valve according to claim 1, characterized in that: The upper side of the valve body (1) is fixedly installed with a flow sensor (3), the signal input end of the flow sensor (3) is connected and penetrates a detection unit (4), the detection unit (4) is arranged on the inlet side of the valve body (1), and the flow sensor (3) is in control connection with an execution unit (2); 3. The automatic closure device for a pneumatic butterfly valve according to claim 1, characterized in that: The fixed end of the pneumatic piston (203) is provided with an exhaust port (9), the inside of the exhaust port (9) is provided with a sliding sealing mechanism (10), the outer surface of the sliding sealing mechanism (10) is sleeved with a connecting ring (11) with a vent hole, the middle part of the connecting ring (11) is slidingly connected with a blocking sleeve (12) which blocks the vent, and the blocking sleeve (12) and the connecting ring (11) are fixedly connected through an air bag (13) and a reset spring (14). The input end of the air bag (13) is connected and penetrated with the air inlet end of the pneumatic piston (203) on the other side.

4. The automatic closure device for a pneumatic butterfly valve according to claim 1, wherein: The execution unit (2) comprises an outer shell (207), the outer shell (207) is fixedly installed on the outer surface of the valve body (1), the gear (201) is rotatably connected in the inner part of the outer shell (207), the single-sided rack frame (202) is slidingly connected with the outer shell (207), and the fixed end of the pneumatic piston (203) is fixedly connected with the outer shell (207).

5. The automatic closure device for a pneumatic butterfly valve according to claim 3, characterized in that: The outer surface of the connecting ring (11) is fixedly installed with a stepped lower fixed ring (15), the outer surface of the blocking sleeve (12) is fixedly installed with an upper fixed ring (16), the air bag (13) is located on the inner side of the reset spring (14), and the control pipe of the air bag (13) extends from the lower side of the reset spring (14).

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