Pneumatic ball valve device

Abstract

The utility model provides a pneumatic ball valve device, which belongs to the technical field of pneumatic valves and comprises a valve body, a valve cover, a first valve seat, a connecting pipe and a flow guide structure, the valve cover is detachably mounted on one side of the valve body through a bolt, the first valve seat is connected with the valve body and inserted into one side of the valve cover, and the flow guide structure is fixed on one side of the valve body and arranged inside one side of the connecting pipe. And the pressure relief structure is arranged at the top end of the connecting pipe. According to the pressure relief device, the movable piston is pushed to move upwards through steam pressure to extrude air in the compression barrel, then the movable frame is pushed to move upwards through pressure elastic force of the force storage spring, compressed air is injected into the pneumatic actuator, and the pneumatic actuator is started emergently to rotate and open the ball to achieve emergency pressure relief. Therefore, the emergency pressure relief function of the device is achieved, emergency pressure relief can be automatically triggered when a sensor or a feedback mechanism fails, overpressure explosion of a steam pipeline is avoided, system safety is guaranteed, and buffer time is bought for complex control.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic valve technology, specifically to a pneumatic ball valve device. Background Technology

[0002] PCV pneumatic ball valves originate from the safety control requirements of boiler main steam pressure. They are generally installed on the steam pipeline at the outlet of the boiler superheater header. Their function is to automatically open and release pressure when the main steam pressure exceeds the limit. The set pressure is slightly lower than that of the safety valve, and it takes priority to reduce the number of times the safety valve opens. At the same time, it can also be operated remotely and manually, which can buy buffer time for complex controls such as quick opening of the turbine bypass. Although there is a loss of steam in the discharge, it is far less than the cost of restarting the boiler.

[0003] Chinese patent CN221824526U discloses a pneumatic ball valve, including a valve body, valve core, valve stem, pneumatic actuator, feedback shaft, and signal transmitter. The valve core is rotatably mounted within the valve cavity of the valve body. The valve body has a first mounting hole communicating with the valve cavity. The valve stem passes through the first mounting hole, and one end of the valve stem extending into the valve cavity is connected to the valve core. The output end of the pneumatic actuator is connected to the end of the valve stem away from the valve core. A second mounting hole communicating with the valve cavity is provided on the side of the valve body opposite to the first mounting hole. The second mounting hole is coaxial with the first mounting hole. The feedback shaft passes through the second mounting hole, and one end of the feedback shaft extending into the valve cavity is connected to the valve core. The input shaft of the signal transmitter is connected to the end of the feedback shaft away from the valve core. The valve core is directly connected to the signal transmitter indicating the on / off state, making the on / off state feedback of the valve core more accurate and timely; eliminating errors in valve core on / off state feedback caused by incorrect installation of components or damage to components or connectors.

[0004] The aforementioned patent still has the following shortcomings: The use of existing devices relies on manual monitoring in conjunction with boiler sensors. However, due to the continuous high temperature and pressure inside the boiler and the presence of steam, the sensors are prone to signal delays or false alarms due to corrosion and scale buildup. This makes it difficult for the feedback device to accurately reflect the boiler status. When the main steam pressure rises sharply, if the sensor or feedback mechanism is delayed or falsely alarms, the PCV valve cannot open in time to release pressure. The continuous accumulation of pressure will force the safety valve to operate frequently, and may even cause the steam pipeline to overpressure and burst, reducing the safety and reliability of the device. Utility Model Content

[0005] This invention provides a pneumatic ball valve device that solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] An embodiment of this utility model provides a pneumatic ball valve device, including a valve body, and further comprising:

[0008] The valve cover is detachably mounted on one side of the valve body by bolts, and a first valve seat connected to the valve body is inserted inside the side of the valve cover.

[0009] The second valve seat is slidably connected to one side of the valve body, and a ball is rotatably connected between the second valve seat and the first valve seat;

[0010] A pneumatic actuator is detachably mounted on the top of the valve body by bolts, and a connecting tee pipe is installed on one side of the top of the pneumatic actuator via a flange interface;

[0011] The valve stem is installed at the end of the output shaft of the pneumatic actuator;

[0012] A connecting pipe is fixed to one side of the valve body, and a flow guiding structure is provided inside one side of the connecting pipe;

[0013] A pressure relief structure is provided at the top of the connecting pipe. The pressure relief structure includes an air inlet pipe, which is threaded into the inside of the top of the connecting pipe. A compression barrel is fixed to the top of the air inlet pipe. An elastic diaphragm is detachably installed on the top of the compression barrel, and a clamp is fitted on the outer side of the elastic diaphragm. An exhaust pipe is fixed to the top of one side of the compression barrel. An air supply pipe is connected to one side of the exhaust pipe, and a one-way valve is installed in the middle of the air supply pipe.

[0014] The above technical solution involves introducing high-pressure gas through a pneumatic actuator, causing its output shaft to drive the valve stem to rotate. Simultaneously, the valve stem drives the ball to rotate between the first and second valve seats, thereby controlling the flow of steam. The sealing gasket and disc spring inside the valve body ensure that the second valve seat is tightly pressed against the ball, guaranteeing a sealing effect.

[0015] Furthermore, a locking nut is fixed to the bottom of the outer side of the valve stem, graphite packing is provided between the valve stem and the valve body, a sealing gasket is fixed to one side of the valve body, and a disc spring connected to the second valve seat is installed on one side of the sealing gasket.

[0016] The above technical solution prevents the valve stem from flying out by using the locking nut at the bottom of the outer side of the valve stem, ensuring safe use. The graphite packing between the valve stem and the valve body can effectively seal the valve. The deformation of the disc spring reduces the force on the inlet side of the ball, which helps to reduce the rotational resistance of the ball and reduce the rotational torque of the valve stem.

[0017] Furthermore, a movable piston is slidably connected to the bottom of the compression barrel, a storage spring is fixed to the top of the movable piston, a guide rod is inserted inside the storage spring, a top block is fixed to the top of the storage spring, a fixed frame is fixed inside the compression barrel, a second annular strong magnet is fixed inside the top of the fixed frame, a movable frame is slidably connected to the top of the compression barrel, a first annular strong magnet is fixed inside the bottom of the movable frame, a sealing baffle is installed inside one side of the movable frame, and a return spring connected to the movable piston is installed at the bottom of the fixed frame.

[0018] The above technical solution uses steam pressure to push the moving piston upward to compress the air inside the compression barrel. Then, the pressure force of the storage spring pushes the moving frame upward, injecting compressed air into the pneumatic actuator. This causes the pneumatic actuator to start in an emergency and rotate the valve stem, which in turn rotates the ball to open it and achieve emergency pressure relief.

[0019] Furthermore, the guide rod and the top block form a sliding structure, the first annular strong magnet and the second annular strong magnet are located on the same vertical center line, and the first annular strong magnet and the second annular strong magnet form a magnetic connection.

[0020] Through the above technical solution, the guide rod and the sliding structure of the top block ensure that the top block moves smoothly and avoids deviation from affecting the accuracy of the pressure relief action. The first ring strong magnet and the second ring strong magnet are magnetically connected to the vertical center line to form a stable magnetic constraint.

[0021] Furthermore, the elastic diaphragm is installed at the top of the compression barrel by a clamp, and the elastic diaphragm is made of elastic rubber.

[0022] Through the above technical solution, the elastic rubber diaphragm is installed with clamps to seal the top of the compression barrel. When under pressure, it expands and stores energy, and after the pressure is released, it elastically resets, which facilitates disassembly and maintenance and improves the reliability of the seal.

[0023] Furthermore, the flow guiding structure includes a support frame, which is fixed inside the connecting pipe. A rotating shaft is rotatably connected inside the support frame, and flow guiding plates are fixed to the outer side of the rotating shaft. Reinforcing sleeves are fixed to the outer side of the flow guiding plates.

[0024] The above technical solution uses steam to drive the guide plate to rotate, and the guide plate guides the steam to flow in a spiral, making the steam flow field in the connecting pipe more uniform, reducing flow velocity pulsation, and dispersing the impact force of the steam.

[0025] Furthermore, the guide plate has a spiral structure and is arranged in a ring at equal intervals on the outer wall of the rotating shaft.

[0026] Through the above technical solution, the guide plates are arranged in a spiral and annular pattern at equal intervals, which can guide the steam spiral flow, make the steam flow field uniform and the flow velocity stable, disperse the impact force, reduce flow velocity pulsation and eddy current loss, and reduce the impact on the pipe and internal parts.

[0027] The above-described solution of this utility model has at least the following beneficial effects:

[0028] This invention utilizes steam pressure to push a moving piston upwards, compressing the air inside the compression barrel. Then, the pressure force of a storage spring pushes a moving frame upwards, injecting compressed air into the pneumatic actuator. The pneumatic actuator then activates in an emergency, rotating the sphere to release pressure. This achieves the device's emergency pressure relief function, automatically triggering emergency pressure relief when sensors or feedback mechanisms fail, preventing steam pipes from overpressure bursting, ensuring system safety, and providing buffer time for complex control operations.

[0029] This invention reduces the force on the inlet side of the ball by deforming the disc spring, which helps to reduce the rotational resistance of the ball and lower the rotational torque of the valve stem. This achieves the rotational resistance reduction function of the device, making valve operation easier and effectively preventing valve stem jamming or damage caused by excessive torque, thus extending the service life of the valve.

[0030] This invention utilizes steam to drive the guide plate to rotate, while the guide plate guides the steam to flow in a spiral pattern, making the steam flow field within the connecting pipe more uniform. This achieves the steam guiding function of the device, reduces steam velocity pulsation, disperses steam impact force, reduces impact wear on pipes and internal parts, enhances equipment operational stability, and extends service life. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0033] Figure 3 A three-dimensional cross-sectional structural diagram of the pressure relief structure provided by this utility model;

[0034] Figure 4 A three-dimensional cross-sectional structural diagram of the flow guiding structure provided by this utility model;

[0035] Figure 5 Provided by this utility model Figure 2 Enlarged cross-sectional view of a portion of point A in the middle section;

[0036] Figure 6 Provided by this utility model Figure 2 Enlarged cross-sectional view of section B in the middle.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Valve body; 2. Valve cover; 3. Connecting tee pipe; 4. Pressure relief structure; 401. Gas supply pipe; 402. One-way valve; 403. Elastic diaphragm; 404. Clamp; 405. Compression tank; 406. Moving frame; 407. Fixed frame; 408. Top block; 409. Moving piston; 410. Inlet pipe; 411. Exhaust pipe; 412. Sealing baffle; 413. First annular strong magnet; 414. Second 415. Ring-shaped strong magnet; 416. Storage spring; 417. Guide rod; 418. Return spring; 5. Flow guiding structure; 501. Reinforcing sleeve; 502. Flow guide plate; 503. Support frame; 504. Rotating shaft; 6. Connecting pipe; 7. Pneumatic actuator; 8. Ball; 9. First valve seat; 10. Locking nut; 11. Graphite packing; 12. Valve stem; 13. Second valve seat; 14. Disc spring; 15. Sealing gasket. Detailed Implementation

[0039] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0040] like Figures 1 to 6 As shown, an embodiment of this utility model provides a pneumatic ball valve device, including a valve body 1, and further comprising:

[0041] The valve cover 2 is detachably mounted on one side of the valve body 1 by bolts, and a first valve seat 9 connected to the valve body 1 is inserted inside one side of the valve cover 2.

[0042] The second valve seat 13 is slidably connected to one side inside the valve body 1, and a ball 8 is rotatably connected between the second valve seat 13 and the first valve seat 9.

[0043] The pneumatic actuator 7 is detachably mounted on the top of the valve body 1 by bolts, and a connecting tee pipe 3 is installed on one side of the top of the pneumatic actuator 7 via a flange interface; it should be added that a check valve is installed at the connection between the connecting tee pipe 3 and the pneumatic actuator 7, and the check valve is used to prevent air leakage.

[0044] Valve stem 12 is installed at the end of the output shaft of pneumatic actuator 7;

[0045] The connecting pipe 6 is fixed to one side of the valve body 1, and a flow guiding structure 5 is provided inside one side of the connecting pipe 6;

[0046] The pressure relief structure 4 is set at the top of the connecting pipe 6. The pressure relief structure 4 includes an air inlet pipe 410, which is threaded to the inside of the top of the connecting pipe 6. A compression barrel 405 is fixed at the top of the air inlet pipe 410. An elastic diaphragm 403 is detachably installed at the top of the compression barrel 405, and a clamp 404 is sleeved on the outside of the elastic diaphragm 403. An exhaust pipe 411 is fixed at the top of one side of the compression barrel 405. An air supply pipe 401 is connected to one side of the exhaust pipe 411. A one-way valve 402 is installed at the middle position of the air supply pipe 401.

[0047] A locking nut 10 is fixed to the bottom of the outer side of the valve stem 12. A graphite packing 11 is provided between the valve stem 12 and the valve body 1. A sealing gasket 15 is fixed to one side inside the valve body 1. A disc spring 14 connected to the second valve seat 13 is installed on one side of the sealing gasket 15.

[0048] In this embodiment of the utility model, the three-way pipe 3 is connected to the air inlet end of the pneumatic actuator 7. During use, the three-way pipe 3 is connected to the air source pipeline, and high-pressure gas is introduced into the pneumatic actuator 7 through the three-way pipe 3, causing its output shaft to drive the valve stem 12 to rotate. At the same time, the valve stem 12 drives the ball 8 to rotate between the first valve seat 9 and the second valve seat 13, thereby controlling the flow of steam. The sealing gasket 15 and the disc spring 14 inside the valve body 1 make the second valve seat 13 fit tightly against the ball 8, ensuring a sealing effect. The deformation of the disc spring 14 reduces the force on the inlet side of the ball 8, which helps to reduce the rotational resistance of the ball 8 and reduce the rotational torque of the valve stem 12.

[0049] like Figures 1 to 6 As shown, a movable piston 409 is slidably connected to the bottom of the compression barrel 405. A storage spring 415 is fixed to the top of the movable piston 409. A guide rod 416 is inserted inside the storage spring 415. A top block 408 is fixed to the top of the storage spring 415. A fixing frame 407 is fixed inside the compression barrel 405. A second annular strong magnet 414 is fixed inside the top of the fixing frame 407. A movable frame 406 is slidably connected to the top of the compression barrel 405. A first annular strong magnet 413 is fixed inside the bottom of the movable frame 406. A sealing baffle 412 is installed inside one side of the movable frame 406. A return spring 417 connected to the movable piston 409 is installed at the bottom of the fixed frame 407. A sliding structure is formed between the guide rod 416 and the top block 408. The first annular strong magnet 413 and the second annular strong magnet 414 are located on the same vertical center line and are magnetically connected. The elastic diaphragm 403 is installed at the top of the compression barrel 405 by a clamp 404. The elastic diaphragm 403 is made of elastic rubber.

[0050] In this embodiment of the invention, when the steam inside the connecting pipe 6 enters the compression barrel 405 through the air inlet pipe 410, the steam pressure overcomes the initial pressure of the return spring 417, pushing the moving piston 409 upward. Simultaneously, the upward movement of the moving piston 409 compresses the storage spring 415, causing the top block 408 to move upward and press against the moving frame 406. As the steam pressure continues to increase, the moving piston 409 moves further upward. While the storage spring 415 is compressed, the moving piston 409 squeezes the air inside the compression barrel 405, causing the elastic diaphragm 403 to expand and store pressure. When the moving piston 409 moves to the designated area at the top of the compression barrel 405, the accumulated elastic force of the storage spring 415 is sufficient to overcome the first annular strong magnet 413 and the second... The magnetic force between the ring-shaped strong magnets 414 causes the top block 408 to push the moving frame 406 upward. Then, the sealing baffle 412 is misaligned with the exhaust pipe 411, opening the exhaust pipe 411. Compressed air from the top of the compression tank 405 is injected into the pneumatic actuator 7 through the exhaust pipe 411, the air supply pipe 401, and the connecting tee pipe 3. This causes the pneumatic actuator 7 to start in an emergency and drive the valve stem 12 to rotate, opening the ball 8 to achieve emergency pressure relief. When the steam pressure decreases, the clamp bolt 404 can be loosened counterclockwise with a wrench to remove the clamp 404, allowing the elastic diaphragm 403 to be removed for replacement and maintenance. This allows gas to re-enter the compression tank 405 and the sealing baffle 412 to be reinstalled and reset.

[0051] like Figure 4 As shown, the flow guiding structure 5 includes a support frame 503, which is fixed inside the connecting pipe 6. A rotating shaft 504 is rotatably connected inside the support frame 503. Flow guiding plates 502 are fixed on the outer side of the rotating shaft 504. Reinforcing sleeves 501 are fixed on the outer side of the flow guiding plates 502. The flow guiding plates 502 are spiral in shape and are arranged in a ring at equal intervals on the outer side wall of the rotating shaft 504.

[0052] In this embodiment of the invention, when steam flows through the connecting pipe 6, the steam enters the guide structure 5 and drives the guide plate 502 to rotate. At the same time, the spiral shape of the guide plate 502 guides the steam to flow in a spiral manner. The spiral flow makes the flow field of steam in the connecting pipe 6 more uniform, reduces flow velocity pulsation, and disperses the impact force of steam. The strength of the guide plate 502 is enhanced by the reinforcing sleeve 501, and the rotating shaft 504 is supported by the support frame 503.

[0053] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A pneumatic ball valve device comprising a valve body (1), characterized in that, Also includes: The valve cover (2) is detachably mounted on one side of the valve body (1) by bolts, and a first valve seat (9) connected to the valve body (1) is inserted inside one side of the valve cover (2); The second valve seat (13) is slidably connected to one side inside the valve body (1), and a ball (8) is rotatably connected between the second valve seat (13) and the first valve seat (9); The pneumatic actuator (7) is detachably mounted on the top of the valve body (1) by bolts, and a connecting tee pipe (3) is installed on one side of the top of the pneumatic actuator (7) through a flange interface; Valve stem (12) is installed at the end of the output shaft of pneumatic actuator (7); A connecting pipe (6) is fixed to one side of the valve body (1), and a flow guiding structure (5) is provided inside one side of the connecting pipe (6); A pressure relief structure (4) is provided at the top of the connecting pipe (6). The pressure relief structure (4) includes an air inlet pipe (410), which is threaded to the inside of the top of the connecting pipe (6). A compression barrel (405) is fixed at the top of the air inlet pipe (410). An elastic diaphragm (403) is detachably installed at the top of the compression barrel (405), and a clamp (404) is sleeved on the outside of the elastic diaphragm (403). An exhaust pipe (411) is fixed at the top of one side of the compression barrel (405). An air supply pipe (401) is connected to one side of the exhaust pipe (411). A one-way valve (402) is installed at the middle position of the air supply pipe (401).

2. A pneumatic ball valve apparatus as defined in claim 1, wherein, A locking nut (10) is fixed at the bottom of the outer side of the valve stem (12). Graphite packing (11) is provided between the valve stem (12) and the valve body (1). A sealing gasket (15) is fixed on one side inside the valve body (1). A disc spring (14) connected to the second valve seat (13) is installed on one side of the sealing gasket (15).

3. A pneumatic ball valve apparatus as defined in claim 1, wherein, A movable piston (409) is slidably connected to the bottom of the compression barrel (405). A storage spring (415) is fixed to the top of the movable piston (409). A guide rod (416) is inserted inside the storage spring (415). A top block (408) is fixed to the top of the storage spring (415). A fixed frame (407) is fixed inside the compression barrel (405). A second annular strong magnet (414) is fixed inside the top of the fixed frame (407). A movable frame (406) is slidably connected to the top of the compression barrel (405). A first annular strong magnet (413) is fixed inside the bottom of the movable frame (406). A sealing baffle (412) is installed inside one side of the movable frame (406). A reset spring (417) connected to the movable piston (409) is installed at the bottom of the fixed frame (407).

4. A pneumatic ball valve apparatus as defined in claim 3, wherein, The guide rod (416) and the top block (408) form a sliding structure. The first annular strong magnet (413) and the second annular strong magnet (414) are located on the same vertical center line, and the first annular strong magnet (413) and the second annular strong magnet (414) form a magnetic connection.

5. A pneumatic ball valve apparatus as defined in claim 4, wherein, The elastic diaphragm (403) is installed on the top of the compression barrel (405) by a clamp (404), and the elastic diaphragm (403) is made of elastic rubber.

6. A pneumatic ball valve apparatus as defined in claim 1, wherein, The flow guiding structure (5) includes a support frame (503), which is fixed inside the connecting pipe (6). A rotating shaft (504) is rotatably connected inside the support frame (503). Flow guiding plates (502) are fixed to the outer side of the rotating shaft (504), and a reinforcing sleeve (501) is fixed to the outer side of the flow guiding plate (502).

7. A pneumatic ball valve apparatus as defined in claim 6, wherein, The guide plate (502) has a spiral structure and is arranged in a ring at equal intervals on the outer side wall of the rotating shaft (504).

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