Dust collection type dust-proof assembly for industrial pneumatic regulating valve

Abstract

The application discloses a dust collection type dustproof assembly for an industrial pneumatic regulating valve and relates to the technical field of pneumatic regulating valve rod protection. The application is characterized in that a relatively-slidable isolation protective cover and an isolation dust collection cover are arranged outside the valve rod in a penetrating mode, the isolation protective cover and the isolation dust collection cover form a zigzag sealing gap, the difficulty of dust invasion is greatly increased, efficient interception of the outer wall of the valve rod is realized, and on this basis, a semicircular baffle ring with an inner edge downward recessed oil collecting groove is arranged at the bottom of the isolation protective cover, when the isolation protective cover performs lifting movement, the semicircular baffle ring can forcibly scrape off the dust adhered to the surface of the isolation dust collection cover like a scraper, and dynamic self-cleaning is realized.

Description

Technical Field

[0001] This invention relates to the field of pneumatic control valve stem protection technology, specifically to a dust-collecting dustproof assembly for industrial pneumatic control valves. Background Technology

[0002] Pneumatic control valves are widely used actuators in industrial automation systems. They use pneumatic actuators to drive the valve stem, which in turn moves the valve core, enabling precise control of the flow, pressure, temperature, and level of pipeline media. Their applications cover many fields, including chemical, petroleum, metallurgy, power, and pharmaceutical industries. However, in high-dust industrial environments such as cement, coal chemical, mining, and synthetic hydrochloric acid production, the valve stem of pneumatic control valves is exposed to air rich in dust, sand, and corrosive gases for extended periods. Dust can easily enter the valve body through the tiny gap between the valve stem and the packing, accelerating the wear of the valve stem and sealing packing, shortening the valve's service life, and potentially causing valve stem jamming, malfunction, and serious production safety accidents.

[0003] Regarding valve stem protection structures, various valve stem protection design schemes have emerged in the prior art. For example, patent application CN222334512U proposes a low-noise pneumatic regulating valve, which mainly uses air inlet pipe filter cotton to filter dust and reduce compressed air transmission noise, but does not involve a physical dustproof structure outside the valve stem. Another example is patent application CN223609484U, which proposes a valve stem protection structure for a pneumatic regulating valve. This structure involves covering the corrosion-resistant valve stem with a rubber protective sleeve and securing it with upper and lower stainless steel straps to prevent external dust from accumulating on the valve stem surface. Although this scheme achieves dust interception to a certain extent, the rubber protective sleeve is prone to aging and damage during use, and over time, dust will still penetrate the sliding interface between the valve stem and the packing from the edge of the protective sleeve.

[0004] In summary, traditional pneumatic control valves have the following shortcomings in terms of valve stem dust prevention: First, most conventional dust prevention solutions adopt a passive sealing or static covering structure design, which cannot actively remove dust that has been attached to the sliding interface during valve stem movement. Dust will still cause jamming and wear after long-term accumulation between valve stem and packing.

[0005] Second, the dustproof structure and lubrication system are independent of each other, lacking a design concept that integrates dust removal and lubrication functions into one.

[0006] Third, automatic lubrication systems often rely on external air sources, solenoid valves, and control units, resulting in bulky structures, high energy consumption, and difficulty in direct integration into space-constrained valves.

[0007] Therefore, a dust-collecting dustproof assembly for industrial pneumatic control valves is proposed to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a dust-collecting dustproof assembly for industrial pneumatic control valves to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a dust-collecting and dustproof assembly for industrial pneumatic control valves, comprising:

[0010] A pneumatic valve assembly, wherein the pneumatic valve assembly is provided with a valve seat, a valve body and a valve cover from bottom to top, and a valve stem is provided through the three, and an isolation protective cover is fitted and fixed between the valve stem and the valve body;

[0011] An isolation dust collection cover is also fitted on the valve body and outside the valve stem, and one side of the isolation dust collection cover extends into the isolation protective cover. Together, the two form a dustproof cover on the outer wall of the valve stem to intercept the dust adhering to the outer wall of the valve stem.

[0012] The outer wall of the isolation dust collection hood and the bottom of the isolation protective cover are provided with a semi-circular retaining ring that is inserted in opposite directions. The part of the semi-circular retaining ring that contacts the isolation dust collection hood has an inner edge that is recessed to form an oil collection groove, which is used to isolate the dust adhering to the outer wall of the isolation dust collection hood and to accumulate lubricating oil.

[0013] Furthermore, a positioner for receiving control signals and precisely controlling the position of the valve core is fixed on the valve body via a bracket. A piston box is installed inside the positioner, and a lubrication cylinder for adding lubricating oil is fixed on the outer wall of the positioner.

[0014] Furthermore, the piston box is equipped with air passage pipe one and air passage pipe two, and solenoid valves are installed on both sides of the pipes. Air passage pipe two on one side is connected to the lubrication cylinder, and air passage pipe one on the other side is connected to an air filter pressure reducing valve. One side of the lubrication cylinder is connected to the isolation protective cover through a pipe. The airflow guides the pressure inside the lubrication cylinder, forcing the lubricating oil into the isolation protective cover.

[0015] Furthermore, a drive shaft is movably connected inside the locator at the bottom of the piston box. The drive shaft passes through the locator on one side and is fixed with a connecting rod. A hanging rod is fixed on the side wall of the isolation protective cover. The protrusion on the side wall of the connecting rod engages with the groove on the hanging rod, and the drive shaft is rotated by the vertical movement of the hanging rod.

[0016] Furthermore, a cam is fixedly mounted on the drive shaft, and a piston rod extending from the bottom of the piston box abuts against the cam. The drive shaft rotates to drive the cam to contact the piston rod, compressing the air inside the piston box. This, along with the operation of the solenoid valve on the pipeline, enables directional and intermittent airflow delivery.

[0017] Furthermore, a quick-release valve is installed on the side wall of the piston box, and the lubrication cylinder is connected to the isolation protective cover by a hose, and the whole is loosely installed.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention significantly improves the protection and operational reliability of valve stems in harsh dusty environments by constructing a dynamic nested physical dust barrier and an integrated self-cleaning structure. By interlacing relatively sliding protective covers and dust collection covers around the valve stem, a tortuous sealing gap is formed, greatly increasing the difficulty of dust intrusion and achieving efficient interception of the valve stem's outer wall. Furthermore, an innovative semi-circular retaining ring with a recessed oil collection groove at the bottom of the protective cover is incorporated. When the protective cover moves up and down, the semi-circular retaining ring acts like a scraper, forcibly scraping away dust adhering to the surface of the dust collection cover, achieving dynamic self-cleaning. Simultaneously, its recessed oil collection groove accumulates excess lubricating oil, which is then evenly reapplied to the sliding interface when the protective cover moves in the opposite direction. This closed-loop mechanism of "scraping-accumulation-reapplying" fundamentally solves the problems of easy dust intrusion and dry friction jamming of the sliding surface in traditional structures, significantly extending the maintenance cycle, and is particularly suitable for high-dust industrial environments.

[0020] 2. This invention also utilizes the movement of the regulating valve itself and the power of the air source to construct an integrated pneumatic automatic lubrication system, achieving precise, timed, and quantitative lubrication. By installing a piston box and a lubrication cylinder inside the positioner, and using the hanging rod on the side wall of the isolation protective cover to drive the drive shaft and cam inside the positioner to rotate, the cam periodically pushes up the piston rod at the bottom of the piston box, thereby squeezing the air inside the box to generate a compressed air source. With the timing control of the solenoid valves on air pipe one and air pipe two, this compressed air source can be guided to the lubrication cylinder, squeezing the lubricating oil inside into the gap between the valve stem and each protective cover at a constant pressure and quantity. This system uses the mechanical movement of the valve stem itself as the power source, without the need for additional electrical or pneumatic components. The structure is highly integrated and energy-saving. By adjusting the frequency of the valve stem movement and the on / off sequence of the solenoid valves, the lubrication cycle can be flexibly set, avoiding the randomness or omission of manual lubrication, ensuring that key friction pairs are always in a good lubrication state, and improving the overall automation level and operational stability of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall installation of the dust collection and dustproof assembly of the industrial pneumatic regulating valve of the present invention.

[0022] Figure 2 This is a schematic diagram of the installation structure of the isolation protective cover and the isolation integrated cover on the valve stem of the present invention;

[0023] Figure 3 This is a schematic diagram of the mounting structure of the lubrication cylinder on the back side of the positioner of the present invention;

[0024] Figure 4 This is a schematic diagram showing the valve stem of the present invention positioned inside the isolation protective cover and the isolation dust collection cover;

[0025] Figure 5 This is a schematic diagram of the installation structure of the semi-circular retaining ring and the isolation dust collection hood of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure in which the cam on the drive shaft of the present invention abuts against the piston rod at the bottom of the piston box.

[0027] In the diagram: 1. Pneumatic valve assembly; 101. Valve body; 102. Valve seat; 103. Valve cover; 104. Valve stem; 2. Isolation protective cover; 3. Semi-circular retaining ring; 4. Hanging rod; 5. Isolation dust collection cover; 6. Positioner; 7. Piston box; 8. Drive shaft; 9. Cam; 10. Air pipe one; 11. Air pipe two; 12. Lubrication cylinder. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-6 The present invention provides a technical solution:

[0030] Example 1: This invention proposes a dust-collecting dustproof component for industrial pneumatic control valves. Through a modular protective structure design, a relatively sliding isolation protective cover 2 and an isolation dust collection cover 5 are interspersed on the outside of the valve stem 104 of the pneumatic valve assembly 1. Together, they form a dynamic physical dustproof barrier. Combined with the scraping and oil collection functions of the bottom semi-circular retaining ring 3, the problem of dust intruding into the interior of the pneumatic valve assembly 1 along the outer wall of the valve stem 104 is fundamentally solved. At the same time, the lubricant is enriched and reapplied, which significantly improves the operational stability and lifespan of the valve stem 104 under harsh working conditions.

[0031] In specific operations, such as Figure 1 and Figure 2As shown, the pneumatic valve assembly 1 is arranged from bottom to top as follows: valve seat 102, valve body 101, and valve cover 103. Valve stem 104 runs through the three. Inside the valve body 101, an isolation protective cover 2 is fitted and fixed on the valve stem 104. At the same time, an isolation dust collection cover 5 is fitted on the valve body 101 and outside the valve stem 104. One side of the isolation dust collection cover 5 extends upward and is inserted into the interior of the isolation protective cover 2. When the pneumatic regulating valve is working, the valve stem 104 drives the isolation protective cover 2 to move vertically up and down together, while the isolation dust collection cover 5 remains relatively stationary. This nested structure makes it so that any dust that attempts to seep down from the outside along the valve stem 104 must pass through the tortuous gap between the isolation protective cover 2 and the isolation dust collection cover 5, greatly increasing the difficulty of dust intrusion and achieving efficient interception.

[0032] like Figure 4 and Figure 5 As shown, in order to further remove dust that may adhere to the outer wall of the isolation dust collection cover 5, a semi-circular retaining ring 3 is fixedly installed at the bottom of the isolation protective cover 2. The semi-circular retaining ring 3 is inserted and engaged with the outer wall of the isolation dust collection cover 5 in the opposite direction. When the isolation protective cover 2 moves downward, the inner edge of the semi-circular retaining ring 3 will act like a scraper to forcibly scrape off the dust particles attached to the surface of the isolation dust collection cover 5, thereby achieving dynamic self-cleaning.

[0033] Specifically, the contact portion between the semi-circular retaining ring 3 and the isolation dust collection cover 5 is designed with an inner concave edge to form an annular oil collection groove. When the automatic lubrication system injects lubricating oil into the valve stem 104 area, the excess lubricating oil will flow down due to gravity and accumulate in this oil collection groove. When the isolation protective cover 2 moves upward again, the accumulated lubricating oil will be evenly coated back onto the outer wall of the isolation dust collection cover 5, ensuring continuous lubrication of key sliding surfaces while preventing dust, and avoiding jamming or increased wear caused by dry friction.

[0034] Example 2: For active, timed and quantitative lubrication supply, an integrated automatic lubrication system is cleverly constructed by utilizing the movement of the pneumatic regulating valve itself and the air source of the positioner 6. It can achieve precise lubrication without the need for additional electrical control or power components.

[0035] like Figure 3 and Figure 6 As shown, a positioner 6 is fixed on the valve body 101 by a bracket. A piston box 7 is installed inside the positioner 6. A lubrication cylinder 12 for storing lubricating oil is fixed on its outer wall. A hanging rod 4 is fixedly connected to the side wall of the isolation protective cover 2. Inside the positioner 6, a drive shaft 8 is movably connected. One end of the drive shaft 8 passes through the positioner 6 and is fixed with a connecting rod.

[0036] The protrusion on the side wall of the connecting rod engages with the vertical groove on the hanging rod 4. When the isolation protective cover 2 drives the hanging rod 4 to move vertically, the hanging rod 4 converts the linear motion into the rotational motion of the connecting rod through the cooperation of the groove and the protrusion, thereby driving the drive shaft 8 to rotate.

[0037] A cam 9 is fixedly mounted on the drive shaft 8. A piston rod extends from the bottom of the piston box 7. The end of the piston rod always abuts against the contour surface of the cam 9. When the valve rod 104 moves up and down, driving the drive shaft 8 and the cam 9 to rotate back and forth, the cam 9 will periodically push up the piston rod, thereby squeezing the air inside the piston box 7. The piston box 7 is equipped with an air pipe 10 and an air pipe 21, and solenoid valves are installed on both sides of the pipes. The air pipe 21 is connected to the lubrication cylinder 12, while the air pipe 10 is connected to the air filter pressure reducing valve of the factory air source. One side of the lubrication cylinder 12 is connected to the internal cavity of the isolation protective cover 2 through a hose.

[0038] When the cam 9 pushes up the piston rod, compressed air is generated in the piston box 7. At this time, if the solenoid valve on the control air pipe 10 is closed and the solenoid valve on the control air pipe 21 is opened, the compressed air will enter the lubrication cylinder 12 through the control air pipe 21, pressurize the lubricating oil inside, and force the lubricating oil to be squeezed into the gap between the isolation protective cover 2, the isolation dust collection cover 5 and the valve rod 104 in a metered manner along the hose, so as to achieve active lubrication.

[0039] When the cam 9 returns and the piston rod resets, the quick pressure relief valve on the side wall of the piston box 7 can be opened to release the residual pressure and prevent continuous oil supply. By adjusting the movement frequency of the valve rod 104 and the on / off sequence of the solenoid valve, precise lubrication can be achieved on a regular and quantitative basis. At the same time, the lubrication cylinder 12 and the isolation protective cover 2 are connected by a loosely installed hose to avoid interference to the normal movement of the isolation protective cover 2 caused by the hard connection.

[0040] This invention combines mechanical self-cleaning with pneumatic automatic lubrication to solve the problems of dust contamination and lubrication difficulties in traditional pneumatic regulating valve stems 104, thereby extending maintenance cycles and reducing failure rates. It has advantages such as compact structure, high reliability, and strong adaptability.

[0041] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dust-collecting dustproof assembly for industrial pneumatic control valves, characterized in that, include: The pneumatic valve assembly (1) is provided with a valve seat (102), a valve body (101) and a valve cover (103) from bottom to top, and a valve stem (104) is provided through the three. An isolation protective cover (2) is sleeved and fixed between the valve stem (104) and the valve body (101). An isolation dust collection cover (5) is also provided on the valve body (101) and outside the valve stem (104), and one side of the isolation dust collection cover (5) extends into the isolation protective cover (2). The two together form a dust cover on the outer wall of the valve stem (104) to intercept the dust adhering to the outer wall of the valve stem (104). The outer wall of the isolation dust collection hood (5) and the bottom of the isolation protective cover (2) are provided with a semi-circular retaining ring (3) that is inserted in opposite directions. The contact part between the semi-circular retaining ring (3) and the isolation dust collection hood (5) is recessed along the inner edge to form an oil collection groove, which is used to isolate the dust adhering to the outer wall of the isolation dust collection hood (5) and to accumulate lubricating oil.

2. The dust-collecting dustproof assembly for industrial pneumatic control valves according to claim 1, characterized in that, The valve body (101) is fixed with a positioner (6) that receives control signals and precisely controls the position of the valve core by a bracket. A piston box (7) is installed inside the positioner (6), and a lubrication cylinder (12) for adding lubricating oil is fixed on the outer wall of the positioner (6).

3. The dust-collecting dustproof assembly for industrial pneumatic control valves according to claim 2, characterized in that, The piston box (7) is provided with an air passage pipe 1 (10) and an air passage pipe 2 (11), and solenoid valves are installed on both sides of the pipes. The air passage pipe 2 (11) on one side is connected to the lubrication cylinder (12), and the air passage pipe 1 (10) on the other side is connected to an air filter pressure reducing valve. One side of the lubrication cylinder (12) is connected to the isolation protective cover (2) through a pipe. The lubrication cylinder (12) is pressurized by airflow guidance, and the lubricating oil is squeezed into the isolation protective cover (2).

4. The dust-collecting dustproof assembly for industrial pneumatic control valves according to claim 3, characterized in that, The piston box (7) has a drive shaft (8) movably connected inside the locator (6) at the bottom. The drive shaft (8) passes through the locator (6) on one side and is fixed with a connecting rod. A hanging rod (4) is fixed on the side wall of the isolation protective cover (2). The protrusion on the side wall of the connecting rod engages with the groove on the hanging rod (4) and drives the drive shaft (8) to rotate by vertically moving the hanging rod (4).

5. The dust-collecting dustproof assembly for industrial pneumatic control valves according to claim 4, characterized in that, A cam (9) is fixedly mounted on the drive shaft (8). The piston rod extending from the bottom of the piston box (7) abuts against the cam (9). The drive shaft (8) rotates to drive the cam (9) to contact the piston rod, squeezing the air in the piston box (7). Accompanied by the operation of the solenoid valve on the pipeline, the airflow is delivered in a directional and intermittent manner.

6. The dust-collecting dustproof assembly for industrial pneumatic control valves according to claim 5, characterized in that, The piston box (7) is also equipped with a quick pressure relief valve on its side wall. The lubrication cylinder (12) is connected to the isolation protective cover (2) by a hose and is installed loosely as a whole.

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