Main valve structure of high pressure pneumatic clearing device

Abstract

The utility model discloses a main valve structure of high pressure pneumatic cleaning device, including valve body, valve ball, left valve pipe spare, right valve pipe spare, the inside of valve body is provided with valve cavity, valve ball rotation is connected in the inside of valve cavity, the left side of valve body is fixedly connected with left valve pipe spare through flange spare, left valve pipe spare other end is connected with gas pressure system, be provided with pneumatic seal spare in left valve pipe spare, pneumatic seal spare and valve ball left side contact, the right side of valve body is fixedly connected with right valve pipe spare through flange spare, right valve pipe spare other end is connected with cleaning device, be provided with spring seal spare in right valve pipe spare, spring seal spare and valve ball right side contact. The utility model discloses a kind of main valve structures of reliable sealing, effectively improve service life and safety.

Description

Technical Field

[0001] The utility model relates to the technical field of gas valves, and particularly to a main valve structure of a high-pressure pneumatic bin cleaning device. Background Art

[0002] As a core component for industrial fluid control, high-pressure pneumatic valves are widely used in fields such as material transportation, energy chemical industry, and mine bin cleaning. In a bin cleaning device, the main valve needs to be frequently opened and closed to regulate the pulsed jet of high-pressure gas, which is used to break the arching or sticking and blocking of materials in the bin. Such working conditions pose severe requirements on the sealing performance, response speed, and durability of the valve: Challenge of sealing reliability: The working medium of the bin cleaning device often contains dust, moisture, or corrosive components, which are likely to erode the sealing interface. Traditional ball valves rely on a single soft seal (such as a PTFE seat) or a metal hard seal, and are prone to leakage due to particle embedding or material creep under high-pressure fluctuations, requiring frequent maintenance. Insufficient dynamic pressure adaptation: The air pressure during the bin cleaning process changes in a pulsed manner (such as the instantaneous impact of high-pressure pneumatic flow assistance). Existing pneumatic seals mostly rely on static pre-tightening force or passive compensation of the system pressure. When the pressure drops suddenly, the adhesion force of the sealing surface weakens, and when the pressure peak occurs, the sealing parts are prone to overloading and deformation. Life bottleneck under frequent operation: The valve can be opened and closed hundreds of times a day on average. The constant pre-tightening force of the traditional spring seal intensifies the friction loss between the valve ball and the sealing ring, resulting in scratches on the sealing surface or spring fatigue, and the average life is less than 50,000 times. Maintenance complexity: Replacing the sealing parts requires disassembling the pipeline flange, resulting in a long downtime. For example, when the valve supporting an air cannon fails, the bin cleaning operation needs to be interrupted, affecting the production continuity. Content of the Utility Model

[0003] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide a main valve structure with reliable sealing, effectively improving the service life and safety.

[0004] The technical solution adopted by this utility model to achieve the above-mentioned objectives is as follows: a main valve structure of a high-pressure pneumatic cleaning device, including a valve body, a valve ball, a left valve fitting, and a right valve fitting. The valve body has a valve cavity inside, and the valve ball is rotatably connected inside the valve cavity. A valve stem is also connected to the upper end of the valve ball, and the valve stem of the valve stem extends from the top of the valve body for connecting a handwheel or electric drive mechanism to achieve rotation control of the valve ball. The left valve fitting is fixedly connected to the left side of the valve body via a flange, and the other end of the left valve fitting is connected to a pneumatic system. A pneumatic seal is provided inside the left valve fitting to improve the sealing performance of the main valve structure after the valve is closed. The pneumatic seal contacts the left side of the valve ball. The right valve fitting is fixedly connected to the right side of the valve body via a flange, and the other end of the right valve fitting is connected to the cleaning device. A spring seal is provided inside the right valve fitting, and the spring seal contacts the right side of the valve ball, also for improving the sealing performance of the main valve structure after the valve is closed.

[0005] In the above technical solution, a sliding sleeve groove is provided in the valve port on the left side of the valve body. A sliding sleeve is installed in the sliding sleeve groove. One end of the sliding sleeve is in close contact with the valve ball, and a sealing gasket is provided between the valve ball and the sliding sleeve. The sealing gasket is embedded and fixedly connected to the sliding sleeve. An outer ring groove is provided at the other end of the sliding sleeve. A disc spring is provided in the outer ring groove. One end of the disc spring abuts against the left valve pipe.

[0006] In the above technical solution, sealing gaskets are provided at the connection between the left valve fitting and the valve body, and at the connection between the right valve fitting and the valve body.

[0007] In the above technical solution, the pneumatic sealing component includes a first sealing seat, a push-pull rod, a first piston block, a connecting pipe, a piston cylinder, a second piston block, a telescopic rod, and a helical spring. A sliding groove is provided at one end of the left valve fitting on one side of the valve body. The first sealing seat is slidably connected within the sliding groove. One side of the first sealing seat is in close contact with the valve ball. Several push-pull rods are fixedly connected to the other side of the first sealing seat. Several sliding sleeve holes are opened in the sliding groove on the opposite side of the push-pull rod. The push-pull rod is slidably connected within the sliding sleeve holes. Several sliding sleeve cavities are provided in the inner wall of the left valve fitting. One end of each sliding sleeve cavity communicates with a sliding sleeve hole. One end of the push-pull rod passes through the sliding sleeve cavity and is fixedly connected to the first piston block. A piston block moves within a sliding sleeve cavity. An annular cavity is formed inside a left valve fitting on one side of the sliding sleeve cavity. One end of the sliding sleeve cavity is connected to the annular cavity. A connecting pipe is fixedly connected to the outer wall of the left valve fitting. One end of the connecting pipe is connected to the annular cavity, and the other end is connected to the piston cylinder. The piston cylinder is fixedly connected to the outer wall of the left valve fitting, and the interior of the left valve fitting is connected to the bottom of the piston cylinder. A second piston block moves within the piston cylinder. A telescopic rod is fixedly connected to the upper end of the second piston block. The other end of the telescopic rod is fixedly connected to the top of the piston cylinder. A helical spring is sleeved around the outer circumference of the telescopic rod, and both ends of the helical spring are connected to the second piston block and the inner wall of the piston cylinder, respectively.

[0008] In the above technical solution, the spring seal includes a second sealing seat, a sealing ring, an inner sleeve, a retaining ring, and a pressure spring. An assembly hole is provided in the right valve fitting on one side of the valve body. The inner sleeve is slidably connected to the assembly hole, and a gap is left between the inner sleeve and the inner wall of the conversion hole. The pressure spring and the inner sleeve are sequentially slidably connected to the assembly hole, and the pressure spring is sleeved to the outer wall of the inner sleeve. A retaining ring is fixedly connected to the outer wall of the inner sleeve, and the retaining ring is also slidably connected to the assembly hole. One end of the pressure spring abuts against the inner side of the conversion hole, and the other end of the pressure spring abuts against the retaining ring. One end of the second sealing seat is inserted into the annular groove formed between the retaining ring and the inner sleeve, and the other end of the second sealing seat contacts the valve ball. A sealing ring is provided between the retaining ring and the second sealing seat.

[0009] The beneficial effects of this utility model are: 1. This utility model significantly improves the sealing reliability of valves under high-pressure conditions through the dual combination of pneumatic and spring seals. The two sealing mechanisms are independent of each other and can work together to ensure that the system can still maintain an effective seal even if a single seal fails.

[0010] 2. Pneumatic seals utilize the system's own pressure to automatically enhance sealing force. When the medium pressure increases, the piston assembly structure converts the pressure into additional sealing pressure, forming a pressure-self-tightening seal that effectively copes with high-pressure fluctuations.

[0011] 3. The spring seal provides a continuous initial preload, ensuring good sealing performance of the valve even under low or zero pressure conditions. Its spring compensation mechanism automatically compensates for wear on the sealing surface, maintaining stable sealing contact.

[0012] 4. The combination of the sliding assembly and disc spring provides bidirectional preload and pressure relief functions. It enhances the seal when closed, absorbs thermal stress, and automatically relieves pressure when the cavity is overpressurized, thus improving safety.

[0013] 5. The modular sealing design allows key sealing elements (such as the second sealing seat and inner sleeve) to be disassembled and replaced individually, which greatly simplifies the maintenance process, reduces maintenance costs and time, and improves equipment availability.

[0014] 6. The overall structure adopts a full-bore design and corrosion-resistant materials, which significantly reduces fluid resistance and enhances the valve's wear resistance and erosion resistance in gas-solid two-phase flow media, thus extending its service life.

[0015] 7. The multi-seal design (ball seal, flange gasket, stem seal) completely eliminates the possibility of internal and external leakage, enabling the valve to meet strict international sealing standards and is suitable for harsh working conditions such as flammable and explosive environments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 for Figure 2 Detailed structural diagram of part A1 in the middle; Figure 4 for Figure 2 Detailed structural diagram of part A2 in the middle.

[0017] In the diagram: 1 Valve body, 2 Valve ball, 3 Left valve fitting, 4 Right valve fitting, 7 Sliding sleeve, 8 Sealing gasket, 9 Disc spring, 10 Sealing gasket, 11 First sealing seat, 12 Push-pull rod, 13 First piston block, 14 Connecting pipe, 15 Piston cylinder, 16 Second piston block, 17 Telescopic rod, 18 Helical spring, 19 Sliding sleeve cavity, 20 Annular cavity, 21 Second sealing seat, 22 Sealing ring, 23 Inner sleeve, 24 Slotted ring, 25 Pressure spring. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-4 A main valve structure for a high-pressure pneumatic cleaning device includes a valve body 1, a valve ball 2, a left valve fitting 3, and a right valve fitting 4. The valve body 1 has an internal valve cavity, and the valve ball 2 is rotatably connected inside the valve cavity. The valve ball 2 acts as the shut-off core, connected to an external actuator via a valve stem to achieve 90° rotation control of fluid flow. The internal flow channel of the valve body 1 must meet the full-bore design requirements to reduce pressure loss and comply with the low-resistance requirements of high-pressure systems. A valve stem is also connected to the upper end of the valve ball 2, with its stem extending from the top of the valve body 1 and used to connect to a handwheel or electric drive mechanism to control the rotation of the valve ball 2. The left valve fitting 3 is fixedly connected to the left side of the valve body 1 via a flange. The other end of the left valve fitting 3 is connected to the pneumatic system. A pneumatic seal is installed inside the left valve fitting 3 to improve the sealing performance of the main valve structure after valve closure. The seal contacts the left side of the valve ball 2. The right valve fitting 4 is fixedly connected to the right side of the valve body 1 via a flange. The other end of the right valve fitting 4 is connected to the cleaning device. A spring seal is installed inside the right valve fitting 4. The spring seal contacts the right side of the valve ball 2 and is also used to improve the sealing performance of the main valve structure after the valve is closed. Sealing gaskets 10 are installed at the connection between the left valve fitting 3 and the valve body 1, and at the connection between the right valve fitting 4 and the valve body 1, to eliminate the risk of interface leakage and improve the overall sealing performance of the valve body 1.

[0020] In the above technical solution, a sliding sleeve groove is provided in the valve port on the left side of the valve body 1. A sliding sleeve 7 is installed in the sliding sleeve groove. A sealing ring is provided between the sliding sleeve groove and the sliding sleeve 7 to enhance the sealing between the structures. One end of the sliding sleeve 7 is in close contact with the valve ball 2, and a sealing gasket 8 is provided between the valve ball 2 and the sliding sleeve 7. The sealing gasket 8 is embedded and fixedly connected to the sliding sleeve 7. An outer ring groove is provided at the other end of the sliding sleeve 7. A disc spring 9 is provided in the outer ring groove. One end of the disc spring 9 abuts against the left valve fitting 3. The sliding sleeve 7 in the sliding sleeve groove on the left side of the valve body 1 abuts against the left valve fitting 3 through the disc spring 9, forming an initial preload. When the valve ball 2 is closed, the elastic force of the disc spring 9 pushes the sliding sleeve 7 to squeeze towards the valve ball 2, enhancing the fit between the sealing gasket 8 and the valve ball 2, thereby enhancing the airtightness of the valve after it is closed.

[0021] In the above technical solution, the pneumatic sealing component includes a first sealing seat 11, a push-pull rod 12, a first piston block 13, a connecting pipe 14, a piston cylinder 15, a second piston block 16, a telescopic rod 17, and a helical spring 18. A sliding groove is provided at one end of the left valve fitting 3 on one side of the valve body 1. The first sealing seat 11 is slidably connected within the sliding groove. One side of the first sealing seat 11 is in close contact with the valve ball 2. Several push-pull rods 12 are fixedly connected to the other side of the first sealing seat 11. Several sliding sleeve holes are opened in the sliding groove on the opposite side of the push-pull rod 12. The push-pull rod 12 is slidably connected within the sliding sleeve holes. Several sliding sleeve cavities are provided in the inner wall of the left valve fitting 3. 19. One end of the sliding sleeve cavity 19 is connected to the sliding sleeve hole. One end of the push-pull rod 12 passes through the sliding sleeve cavity 19 and is fixedly connected to the first piston block 13. The first piston block 13 moves in the sliding sleeve cavity 19. An annular cavity 20 is opened in the left valve fitting 3 on one side of the sliding sleeve cavity 19. One end of the sliding sleeve cavity 19 is connected to the annular cavity 20. A connecting pipe 14 is fixedly connected to the outer wall of the left valve fitting 3. One end of the connecting pipe 14 is connected to the annular cavity 20, and the other end of the connecting pipe 14 is connected to the piston cylinder 15. The piston cylinder 15 is fixedly connected to the outer wall of the left valve fitting 3, and the inside of the left valve fitting 3 is connected to the bottom of the piston cylinder 15. The second piston block 16 moves in the sliding sleeve cavity 19. The piston moves inside the piston cylinder 15. A telescopic rod 17 is fixedly connected to the upper end of the second piston block 16. The other end of the telescopic rod 17 is fixedly connected to the top of the piston cylinder 15. A helical spring 18 is sleeved around the outer periphery of the telescopic rod 17. The two ends of the helical spring 18 are respectively connected to the second piston block 16 and the inner wall of the piston cylinder 15. When the valve body 1 is closed, the air pressure in the left valve fitting 3 increases, thereby pushing the second piston block 16 inside the piston cylinder 15 to slide upward. The air above the second piston block 16 is injected into the annular cavity 20 through the connecting pipe 14, and then distributed by the annular cavity 20 to the sliding sleeve cavity 19, thereby pushing the first piston in the sliding sleeve cavity 19. The plug 13 moves toward the valve ball 2. The first piston block 13 pushes the first sealing seat 11 toward the valve ball 2 through the push-pull rod 12, thereby further enhancing the airtightness of both ends of the valve body 1 after it is closed. When the valve body 1 is closed, the air pressure in the left valve fitting 3 is released from the valve body 1 to the right valve fitting 4, thereby reducing the pressure in the left valve fitting 3. At this time, under the elastic force of the helical spring 18, the second piston block 16 is pushed to move downward, reducing the air pressure above the second piston block 16, and thus driving the first sealing seat 11 away from the valve ball 2. When the valve is closed, the friction between the first sealing seat 11 and the valve ball 2 can be reduced.

[0022] In the above technical solution, the spring seal includes a second sealing seat 21, a sealing ring 22, an inner sleeve 23, a retaining ring 24, and a pressure spring 25. An assembly hole is provided in the right valve fitting 4 on one side of the valve body 1. The inner sleeve 23 is slidably connected to the assembly hole, with a gap between the inner sleeve 23 and the inner wall of the assembly hole. The pressure spring 25 and the inner sleeve 23 are sequentially slidably connected to the assembly hole, and the pressure spring 25 is sleeved to the outer wall of the inner sleeve 23. A retaining ring 24 is fixedly connected to the outer wall of the inner sleeve 23, and the retaining ring 24 is also slidably connected to the assembly hole. One end of the pressure spring 25 abuts against the inner side of the adapter hole, and the other end of the pressure spring 25 abuts against the retaining ring 24. One end of the second sealing seat 21 is inserted into the annular groove formed between the retaining ring 24 and the inner sleeve 23, and the other end of the second sealing seat 21 contacts the valve ball 2. A sealing ring 22 is provided between the retaining ring 24 and the second sealing seat 21. In use, under the elastic force of the pressure spring, the second sealing seat 21 is always pressed towards the valve ball 2, thereby improving the fit with the valve ball 2 and further improving the airtightness after the valve is closed.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A main valve structure for a high-pressure pneumatic cleaning device, comprising a valve body (1), a valve ball (2), a left valve fitting (3), and a right valve fitting (4), characterized in that: The valve body (1) has a valve cavity inside, and the valve ball (2) is rotatably connected inside the valve cavity. The left side of the valve body (1) is fixedly connected to the left valve fitting (3) through a flange. The other end of the left valve fitting (3) is connected to the pneumatic system. The left valve fitting (3) is provided with a pneumatic seal. The pneumatic seal is in contact with the left side of the valve ball (2). The right side of the valve body (1) is fixedly connected to the right valve fitting (4) through a flange. The other end of the right valve fitting (4) is connected to the cleaning device. The right valve fitting (4) is provided with a spring seal. The spring seal is in contact with the right side of the valve ball (2).

2. The main valve structure of the high-pressure pneumatic cleaning device according to claim 1, characterized in that: A sliding sleeve groove is provided in the valve port on the left side of the valve body (1). A sliding sleeve (7) is installed in the sliding sleeve groove. One end of the sliding sleeve (7) is in close contact with the valve ball (2). A sealing gasket (8) is provided between the valve ball (2) and the sliding sleeve (7). The sealing gasket (8) is embedded in the sliding sleeve (7). An outer ring groove is provided at the other end of the sliding sleeve (7). A disc spring (9) is provided in the outer ring groove. One end of the disc spring (9) abuts against the left valve fitting (3).

3. The main valve structure of the high-pressure pneumatic cleaning device according to claim 1, characterized in that: Sealing gaskets (10) are provided at the connection between the left valve fitting (3) and the valve body (1) and at the connection between the right valve fitting (4) and the valve body (1).

4. The main valve structure of the high-pressure pneumatic cleaning device according to claim 1, characterized in that: The pneumatic sealing component includes a first sealing seat (11), a push-pull rod (12), a first piston block (13), a connecting pipe (14), a piston cylinder (15), a second piston block (16), a telescopic rod (17), and a helical spring (18). A sliding groove is provided at one end of the left valve fitting (3) on one side of the valve body (1). The first sealing seat (11) is slidably connected within the sliding groove. One side of the first sealing seat (11) is in close contact with the valve ball (2). On the other side, several push-pull rods (12) are fixedly connected. Several sliding sleeve holes are opened in the sliding groove on the opposite side of the push-pull rods (12). The push-pull rods (12) are slidably connected in the sliding sleeve holes. Several sliding sleeve cavities (19) are provided in the inner wall of the left valve fitting (3). One end of the sliding sleeve cavity (19) is connected to the sliding sleeve hole. One end of the push-pull rod (12) passes through the sliding sleeve cavity (19) and is fixedly connected to the first piston block (13). The first piston block (13) is in the sliding sleeve cavity (19). 9) Piston movement, an annular cavity (20) is provided in the left valve fitting (3) on one side of the sliding sleeve cavity (19), one end of the sliding sleeve cavity (19) is connected to the annular cavity (20), a connecting pipe (14) is fixedly connected to the outer wall of the left valve fitting (3), one end of the connecting pipe (14) is connected to the annular cavity (20), and the other end of the connecting pipe (14) is connected to the piston cylinder (15), the piston cylinder (15) is fixedly connected to the outer wall of the left valve fitting (3), and the left valve fitting... The interior of component (3) is connected to the bottom of piston cylinder (15). The second piston block (16) moves within piston cylinder (15). A telescopic rod (17) is fixedly connected to the upper end of the second piston block (16). The other end of the telescopic rod (17) is fixedly connected to the top of piston cylinder (15). A helical spring (18) is sleeved around the outer periphery of the telescopic rod (17). The two ends of the helical spring (18) are respectively connected to the inner wall of the second piston block (16) and piston cylinder (15).

5. The main valve structure of the high-pressure pneumatic cleaning device according to claim 1, characterized in that: The spring seal includes a second sealing seat (21), a sealing ring (22), an inner sleeve (23), a retaining ring (24), and a pressure spring (25). An assembly hole is provided in the right valve fitting (4) on one side of the valve body (1). The inner sleeve (23) is slidably connected to the assembly hole. A gap is left between the inner sleeve (23) and the inner wall of the assembly hole. The pressure spring (25) and the inner sleeve (23) are sequentially slidably connected in the assembly hole, and the pressure spring (25) is sleeved and connected to the outer wall of the inner sleeve (23). A retaining ring (24) is fixedly connected, and the retaining ring (24) is also slidably connected in the assembly hole. One end of the pressure spring (25) abuts against the inner side of the conversion hole, and the other end of the pressure spring (25) abuts against the retaining ring (24). One end of the second sealing seat (21) is inserted into the annular groove formed between the retaining ring (24) and the inner sleeve (23). The other end of the second sealing seat (21) is in contact with the valve ball (2). A sealing ring (22) is provided between the retaining ring (24) and the second sealing seat (21).

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