A sealing structure for a low-temperature resistant solenoid valve used in industrial filtration

Abstract

This invention relates to the field of solenoid valve assembly technology, and more particularly to a sealing structure for a low-temperature resistant solenoid valve used in industrial filtration. The technical solution includes: a housing assembly, a sealing block fixedly installed inside the housing assembly, a main valve assembly fixedly installed inside the housing assembly, the main valve assembly and the sealing block being fitted together, a fixing sleeve fixedly installed on the top of the main valve assembly, and an auxiliary transmission frame installed inside the fixing sleeve. This invention utilizes high-pressure gas entering the outlet through the sealing seat. The pressure in the high-pressure chamber decreases sharply, creating a pressure difference between the high-pressure chamber and the inlet. Under the action of gas pressure, the main valve assembly overcomes elastic force, causing the main valve assembly and the sealing block to separate. Gas flows from the inlet to the outlet, thus completing the normal flow conversion. With this structure, the solenoid valve can withstand low temperatures and is safe and reliable, operating normally even in extreme temperature environments.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve assembly technology, and in particular to a sealing structure for a low-temperature resistant solenoid valve used in industrial filtration. Background Technology

[0002] The sealing structure of a solenoid valve ensures that the fluid (liquid or gas) flows along a set path during the opening and closing of the valve, preventing leakage or seepage into the surrounding environment from the valve's sealing points. This avoids media loss, environmental pollution, and potential safety hazards, such as leakage of flammable, explosive, or toxic media. In systems requiring precise control of fluid flow, pressure, or on / off states, a good sealing structure ensures that the solenoid valve completely blocks the fluid when closed and delivers fluid at the required flow and pressure when open, making system control more accurate and stable, and contributing to improved overall system performance and reliability.

[0003] Impurities and particles in the fluid may enter the solenoid valve, clogging the gaps between the sealing surfaces or scratching the sealing surfaces, thus affecting the sealing effect. At the same time, the flow of impurities inside the valve may also accelerate the wear of components such as the valve core and valve seat, causing the sealing performance to gradually decrease.

[0004] A solenoid valve sealing structure is disclosed in the publicly available patent document CN202510818U. This sealing structure includes a flow guide tube, a sealing gasket, a sealing gasket body, and a sealing gasket seat. The flow guide tube abuts against the sealing gasket, and the sealing gasket body is disposed between the sealing gasket and the sealing gasket seat. The contact surface between the sealing gasket body and the sealing gasket seat is spherical, thereby increasing the service life of the sealing gasket, allowing it to be used up to 1.5 million times at a suitable switching frequency.

[0005] While the sealing gasket used in the upper device has a spherical contact surface on one side, this contact surface still needs to work for a long time, resulting in a shorter overall service life and affecting the overall sealing performance of the device.

[0006] Therefore, this application proposes a low-temperature resistant solenoid valve sealing structure for industrial filtration, in order to address the above-mentioned devices during use. Summary of the Invention

[0007] The purpose of this invention is to address the problem in the prior art that existing sealing components have a low overall service life due to the need for long-term operation of the contact surface, which in turn affects the overall sealing performance of the equipment. The invention proposes a low-temperature resistant solenoid valve sealing structure for industrial filtration.

[0008] The technical solution of the present invention: a sealing structure for a low-temperature resistant solenoid valve for industrial filtration, comprising a housing assembly, characterized in that: a sealing block is fixedly installed inside the housing assembly; a main valve assembly is fixedly installed inside the housing assembly; the main valve assembly and the sealing block are fitted together; a fixing sleeve is fixedly installed on the top of the main valve assembly; an auxiliary transmission frame is installed inside the fixing sleeve; a sealing seat is fixedly installed on the top of the auxiliary transmission frame; the interior of the auxiliary transmission frame is a high-pressure chamber; a coil assembly is fixedly installed on the top of the housing assembly; a moving iron core is provided inside the coil assembly; a pilot valve is fixedly installed at the bottom of the moving iron core; and a transmission assembly is fixedly installed on one side of the housing assembly. The pilot valve includes a pusher frame disposed at the bottom of the moving iron core, an auxiliary positioning rod fixedly installed at the bottom of the pusher frame, a clamping arc block disposed at the bottom of the auxiliary positioning rod, and a sealing ball rotatably mounted at the bottom of the clamping arc block; The transmission component includes a transmission jacket, inside which a transmission inner sleeve for air intake is fixedly installed, and a filter screen is installed at the connection between the transmission component and the housing component.

[0009] Optionally, a second sealing ring is fixedly installed at the connection between the sealing block and the housing assembly, a first sealing ring is fixedly installed at the connection between the fixed sleeve and the auxiliary transmission frame, and a first spring is provided between the fixed sleeve and the auxiliary transmission frame.

[0010] Optionally, the pilot valve further includes a plurality of first positioning clamping blocks fixedly installed on the inner wall of the housing assembly, and the plurality of first positioning clamping blocks are arranged in a ring about the inner wall of the housing assembly.

[0011] Optionally, the first positioning clamping block is internally hinged with a first hinge rod, the bottom of the first hinge rod is hinged with an arc-shaped hinge rod, one side of the arc-shaped hinge rod is hinged with a second hinge rod, the side of the second hinge rod away from the inner wall of the housing assembly is hinged with a second positioning clamping block, and the second positioning clamping block is fixedly installed on the outer wall of the auxiliary positioning rod.

[0012] Optionally, the auxiliary positioning rod has a cavity inside, and a fixed base is fixedly installed inside the auxiliary positioning rod through the cavity. An elastic sheet is fixedly installed at the bottom of the fixed base.

[0013] Optionally, airbags are fixedly installed at the bottom of the plurality of elastic sheets, and the airbags are attached to the inner wall of the auxiliary positioning rod in normal condition.

[0014] Optionally, a clamping rod is fixedly installed at the bottom of the airbag, and the clamping rod is fixedly installed at the top of the clamping arc-shaped block.

[0015] Optionally, the inner wall of the transmission sleeve is slidably mounted with a sliding block via an auxiliary sliding groove, and a positioning block is fixedly mounted on the inner wall of the sliding block.

[0016] Optionally, the inner wall of the sliding block is provided with a rotating sleeve, the outer wall of the rotating sleeve is provided with an external thread, the positioning block is slidably installed inside the external thread, and a cleaning wheel is fixedly installed on one side of the rotating sleeve.

[0017] Optionally, a limiting sleeve is fixedly installed inside the transmission sleeve, and a vertical slide rail is provided on the inner wall of the limiting sleeve.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. High-pressure gas enters the outlet through the sealing seat, the pressure in the high-pressure chamber decreases sharply, and a pressure difference is formed between the high-pressure chamber and the inlet. Under the action of gas pressure, the main valve assembly overcomes the elastic force, causing the main valve assembly and the sealing block to separate. The gas flows from the inlet to the outlet, thus completing the normal flow conversion. Under this structure, the solenoid valve can withstand low temperatures and is safe and reliable, and can also work normally in extreme temperature working environments. 2. The arc-shaped hinge moves toward the inner wall of the housing assembly under the reverse push of the second hinge rod. The arc-shaped hinge exerts pressure on the inner wall of the housing assembly. Since the force is divided equally, the pressure of multiple arc-shaped hinges on the inner wall of the housing assembly is equal, causing the auxiliary positioning rod to be in the middle position, so that the sealing ball can fit into the transmission hole of the sealing seat, thereby improving the sealing accuracy. 3. The reaction force of the clamping arc block and the elastic force of the elastic sheet cause the airbag to be squeezed and expand outward. The airbag always fits against the inner wall cavity of the auxiliary positioning rod, preventing external dust and other objects from entering the cavity and damaging the internal components. It also provides a thrust for the sealing between the clamping arc block and the sealing seat, thus enhancing the sealing efficiency. 4. Due to the rolling friction between the positioning block and the external thread, the rotating sleeve rotates along the sliding block. The sliding block cleans the filter area where the transmission component and housing component are connected along the vertical slide rail. The cleaning wheel is equipped with a brush assembly, which agitates the dust in this area, thereby preventing the filter from clogging and extending its service life. At the same time, the cleaning wheel is easy to remove, which also facilitates later cleaning. Attached Figure Description

[0019] Figure 1 A schematic diagram of the sealing structure of the solenoid valve of the present invention is provided; Figure 2 This is a schematic diagram of the sealing seat of the present invention; Figure 3 for Figure 2 Enlarged view of region A in the middle; Figure 4 for Figure 2 Enlarged view of region B in the middle; Figure 5 This is a schematic diagram of the auxiliary positioning rod of the present invention; Figure 6 for Figure 5 Enlarged view of the central C region; Figure 7 This is a schematic diagram of the transmission inner sleeve of the present invention; Figure 8 for Figure 7 Enlarged view of the central D region; Figure 9 This is a schematic diagram of the structure of the housing assembly of the present invention; Figure 10 for Figure 9 Enlarged view of the central E region.

[0020] Reference numerals: 1. Housing assembly; 2. Sealing block; 3. Main valve assembly; 4. Fixing sleeve; 5. Auxiliary transmission frame; 6. Sealing seat; 7. Pilot valve; 701. Pushing frame; 702. First positioning clamping block; 703. First hinge rod; 704. Arc-shaped hinge rod; 705. Second positioning clamping block; 706. Second hinge rod; 707. Auxiliary positioning rod; 708. Sealing ball; 709. Clamping arc-shaped block; 710. Fixed base; 711. 712. Elastic sheet; 713. Airbag; 714. Clamping rod; 8. Moving iron core; 9. Coil assembly; 10. First sealing ring; 11. Second sealing ring; 12. First spring; 13. Transmission assembly; 1301. Transmission outer sleeve; 1302. Transmission inner sleeve; 1303. Rotary sliding sleeve; 1304. External thread; 1305. Positioning block; 1306. Sliding block; 1307. Cleaning wheel; 1308. Limiting sliding sleeve; 1309. Vertical slide rail. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] The present invention proposes a sealing structure for a low-temperature resistant solenoid valve for industrial filtration, comprising a housing assembly 1, a sealing block 2 fixedly installed inside the housing assembly 1, a main valve assembly 3 fixedly installed inside the housing assembly 1, the main valve assembly 3 and the sealing block 2 being fitted together, a fixing sleeve 4 fixedly installed on the top of the main valve assembly 3, an auxiliary transmission frame 5 installed inside the fixing sleeve 4, a sealing seat 6 fixedly installed on the top of the auxiliary transmission frame 5, the interior of the auxiliary transmission frame 5 being a high-pressure chamber, a coil assembly 9 fixedly installed on the top of the housing assembly 1, a moving iron core 8 disposed inside the coil assembly 9, a pilot valve 7 fixedly installed on the bottom of the moving iron core 8, and a transmission assembly 13 fixedly installed on one side of the housing assembly 1; A second sealing ring 11 is fixedly installed at the connection between the sealing block 2 and the housing assembly 1; a first sealing ring 10 is fixedly installed at the connection between the fixing sleeve 4 and the auxiliary transmission frame 5; a first spring 12 is provided between the fixing sleeve 4 and the auxiliary transmission frame 5. This product is a pilot-operated two-position two-way solenoid valve, and the medium is inert gases such as compressed air and ammonia. Figures 9-10 As shown, when the solenoid valve is not energized, gas enters from the inlet and enters the main valve assembly 3 through the pilot hole. Filter screens are installed at the connection points between the transmission assembly 13 and the housing assembly 1 to filter out smaller impurities and prevent impurities from clogging the pilot hole, which would cause the solenoid valve to fail. The main valve assembly 3, under the action of the elastic force and air pressure of the first sealing ring 10 and the second sealing ring 11, comes into close contact with the sealing block 2 and seals it. The higher the pressure, the better the sealing performance.

[0023] When the solenoid valve is energized, the coil assembly 9 generates magnetic force, which in turn generates attraction force on the moving iron core 8. The moving iron core 8 drives the pilot valve 7 to separate from the sealing seat 6. High-pressure gas enters the outlet through the sealing seat 6, and the pressure in the high-pressure chamber decreases sharply. A pressure difference is formed between the high-pressure chamber and the inlet. The main valve assembly 3 overcomes the elastic force under the action of gas pressure, causing the main valve assembly 3 and the sealing block 2 to separate. Gas flows from the inlet to the outlet, thus completing the normal flow conversion of the airflow.

[0024] With this structure, the solenoid valve can withstand low temperatures and is safe and reliable, operating normally in a working environment of -55℃.

[0025] Furthermore, the coil of this solenoid valve can be removed and replaced without disassembling the valve assembly to adapt to different voltage, resistance, and temperature rise requirements.

[0026] like Figure 1 , Figure 2 As shown, the pilot valve 7 also includes a plurality of first positioning clamping blocks 702 fixedly installed on the inner wall of the housing assembly 1, and the plurality of first positioning clamping blocks 702 are arranged in a ring about the inner wall of the housing assembly 1. A first hinge rod 703 is hinged inside the first positioning clamping block 702, an arc-shaped hinge rod 704 is hinged at the bottom of the first hinge rod 703, a second hinge rod 706 is hinged on one side of the arc-shaped hinge rod 704, and a second hinge rod 706 is hinged on the side of the second hinge rod 706 away from the inner wall of the housing assembly 1. The second positioning clamping block 705 is fixedly installed on the outer wall of the auxiliary positioning rod 707. The pilot valve 7 includes a pusher frame 701 set at the bottom of the moving iron core 8. The bottom of the pusher frame 701 is fixedly installed with the auxiliary positioning rod 707. The bottom of the auxiliary positioning rod 707 is provided with a clamping arc block 709. The bottom of the clamping arc block 709 is rotatably installed with a sealing ball 708. This product is a pilot-operated two-position two-way solenoid valve. The medium is compressed air and inert gases such as ammonia. Long-term use, high temperature, chemical corrosion, and frequent switching operations can cause sealing materials such as sealing rings and gaskets to age, harden, become brittle, wear, or crack, leading to a decline in sealing performance and leakage. Furthermore, impurities and particles in the fluid may enter the solenoid valve, clogging the gaps between sealing surfaces or scratching the sealing surface, affecting the sealing effect. Therefore, the sealing ball 708 is designed as a spherical mechanism, which can precisely fit the orifice of the sealing seat 6. When a gap is created between the sealing ball 708 and the sealing seat 6, it may rotate along the clamping arc block 709 when subjected to gas impact. After the sealing ball 708 rotates, the surface that was originally in contact with the sealing seat 6 will be replaced by another surface, resulting in a longer service life for the sealing ball 708, making it more durable than traditional sealing rings and gaskets.

[0027] The auxiliary positioning rod 707 has an internal cavity, through which a fixed base 710 is fixedly installed. An elastic piece 711 is fixedly installed at the bottom of the fixed base 710. Figures 1-3 When the pusher 701 moves the auxiliary positioning rod 707 upward, during this process, high-pressure gas enters the main valve assembly 3 from the housing assembly 1. At this time, the second positioning clamping block 705 deflects, and the arc-shaped hinge rod 704 moves towards the auxiliary positioning rod 707 under the guidance of the first hinge rod 703 and the second hinge rod 706. The arc-shaped hinge rod 704 generates a clamping force on the pusher 701, thereby reducing the vibration that occurs when the high-pressure gas impacts the auxiliary positioning rod 707 and preventing the sealing ball 708 from shifting later and causing leakage. When the auxiliary positioning rod 707 moves downward, the second hinge rod 706 deflects in the opposite direction. At this time, the arc-shaped hinge rod 704 moves towards the inner wall of the housing assembly 1 under the reverse push of the second hinge rod 706. The arc-shaped hinge rod 704 exerts pressure on the inner wall of the housing assembly 1. Since the force is evenly distributed, the pressure of multiple arc-shaped hinge rods 704 on the inner wall of the housing assembly 1 is equal, causing the auxiliary positioning rod 707 to be in the middle position, so that the sealing ball 708 can fit into the transmission hole of the sealing seat 6, thereby improving the sealing accuracy.

[0028] like Figure 1 and Figure 3 As shown, an airbag 712 is fixedly installed at the bottom of the elastic sheet 711. In its normal state, the airbag 712 adheres to the inner wall of the auxiliary positioning rod 707. A clamping rod 713 is fixedly installed at the bottom of the airbag 712, and the clamping rod 713 is fixedly installed at the top of the clamping arc-shaped block 709. It should be noted that the interior of the auxiliary positioning rod 707 is relatively thin, with a diameter of approximately 3 mm. Therefore, both the airbag 712 and the elastic sheet 711 are components with a diameter less than 3 mm. Figures 4-6Because the sealing ball 708 is exposed to a highly corrosive and other adverse environment for a long time, its overall volume will be damaged when it is corroded. The elastic sheet 711 is normally in a compressed state. As the sealing ball 708 corrodes, the elastic sheet 711 further drives the airbag 712 and the clamping rod 713 to move downward through its elastic force. The clamping rod 713 clamps the arc-shaped block 709, which keeps the sealing ball 708 in contact with the opening of the sealing seat 6, thus ensuring good sealing performance. Due to the reaction force of the clamping arc-shaped block 709 and the elastic force of the elastic sheet 711, the airbag 712 is squeezed and expands outward. The airbag 712 is always in contact with the inner cavity of the auxiliary positioning rod 707, preventing external dust and other objects from entering the cavity and damaging the internal components. It also provides a thrust for the sealing between the clamping arc-shaped block 709 and the sealing seat 6, enhancing the sealing efficiency.

[0029] In this embodiment, the transmission component 13 includes a transmission outer sleeve 1301, an inner transmission sleeve 1302 for air intake is fixedly installed inside the transmission outer sleeve 1301, a sliding block 1306 is slidably installed on the inner wall of the inner transmission sleeve 1302 via an auxiliary sliding groove, a positioning block 1305 is fixedly installed on the inner wall of the sliding block 1306, a rotating sleeve 1303 is provided on the inner wall of the sliding block 1306, an external thread 1304 is provided on the outer wall of the rotating sleeve 1303, the positioning block 1305 is slidably installed inside the external thread 1304, a cleaning wheel 1307 is fixedly installed on one side of the rotating sleeve 1303, a limiting sleeve 1308 is fixedly installed inside the transmission inner sleeve 1302, and a vertical slide rail 1309 is provided on the inner wall of the limiting sleeve 1308. Figures 7-8 When gas enters through the inlet of the inner sleeve 1302, due to the high pressure of the airflow, the lighter rotating sleeve 1303 slides along the sliding block 1306. The side of the sliding block 1306 is blocked by the limiting sleeve 1308. At this time, due to the rolling friction between the positioning block 1305 and the external thread 1304, the rotating sleeve 1303 rotates along the sliding block 1306. The sliding block 1306 cleans the filter area connecting the transmission component 13 and the housing component 1 along the vertical slide rail 1309. The cleaning wheel 1307 is equipped with a brush assembly. As the cleaning wheel 1307 moves, it breaks up the dust in this area, thereby preventing the filter from clogging and extending its service life. At the same time, the cleaning wheel 1307 is easy to remove and facilitates later cleaning. Furthermore, as the gas enters the pilot valve 7 from the transmission component 13, it is first filtered by a filter screen to prevent impurities in the gas from causing wear on the sealing ball 708, which serves as a sealing component. The cleaning wheel 1307 in the transmission component 13 cleans the impurities on the filter screen, enabling the continuous use of the filter screen and preventing it from becoming clogged. Therefore, the anti-clogging and anti-wear effects of the transmission component 13 on the filter screen, combined with the elastic compensation and spherical rotation design of the transmission component 13 during the sealing process, jointly solve the problem of short sealing life in industrial filtration scenarios.

[0030] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "including," "Include" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A low temperature resistant solenoid valve seal structure for industrial filtration comprising a housing assembly, characterized by: A sealing block is fixedly installed inside the housing assembly. A main valve assembly is fixedly installed inside the housing assembly. The main valve assembly and the sealing block are fitted together. A fixing sleeve is fixedly installed on the top of the main valve assembly. An auxiliary transmission frame is installed inside the fixing sleeve. A sealing seat is fixedly installed on the top of the auxiliary transmission frame. The interior of the auxiliary transmission frame is a high-pressure chamber. A coil assembly is fixedly installed on the top of the housing assembly. A moving iron core is provided inside the coil assembly. A pilot valve is fixedly installed at the bottom of the moving iron core. A transmission assembly is fixedly installed on one side of the housing assembly. The pilot valve includes a pusher frame disposed at the bottom of the moving iron core, an auxiliary positioning rod fixedly installed at the bottom of the pusher frame, a clamping arc block disposed at the bottom of the auxiliary positioning rod, and a sealing ball rotatably mounted at the bottom of the clamping arc block; The transmission component includes a transmission jacket, inside which a transmission inner sleeve for air intake is fixedly installed, and a filter screen is installed at the connection between the transmission component and the housing component.

2. The low-temperature-resistant electromagnetic valve sealing structure for industrial filtration according to claim 1, characterized in that, A second sealing ring is fixedly installed at the connection between the sealing block and the housing assembly, a first sealing ring is fixedly installed at the connection between the fixed sleeve and the auxiliary transmission frame, and a first spring is provided between the fixed sleeve and the auxiliary transmission frame.

3. The low-temperature-resistant electromagnetic valve sealing structure for industrial filtration according to claim 2, characterized in that, The pilot valve also includes a plurality of first positioning clamping blocks fixedly installed on the inner wall of the housing assembly, and the plurality of first positioning clamping blocks are arranged in a ring about the inner wall of the housing assembly.

4. The low-temperature-resistant electromagnetic valve seal structure for industrial filtration according to claim 3, characterized in that, The first positioning clamping block has a first hinge rod hinged inside, the bottom of the first hinge rod is hinged to an arc-shaped hinge rod, one side of the arc-shaped hinge rod is hinged to a second hinge rod, the side of the second hinge rod away from the inner wall of the housing assembly is hinged to a second positioning clamping block, and the second positioning clamping block is fixedly installed on the outer wall of the auxiliary positioning rod.

5. The low-temperature-resistant electromagnetic valve seal structure for industrial filtration according to claim 4, characterized in that, The auxiliary positioning rod has a cavity inside, and a fixed base is fixedly installed inside the auxiliary positioning rod through the cavity. An elastic sheet is fixedly installed at the bottom of the fixed base.

6. The low-temperature-resistant electromagnetic valve seal structure for industrial filtration according to claim 5, characterized in that, An airbag is fixedly installed at the bottom of each of the elastic sheets, and the airbag is attached to the inner wall of the auxiliary positioning rod in normal condition.

7. The low-temperature-resistant electromagnetic valve seal structure for industrial filtration according to claim 6, characterized in that, A clamping rod is fixedly installed at the bottom of the airbag, and the clamping rod is fixedly installed at the top of the clamping arc-shaped block.

8. The sealing structure of a low-temperature resistant solenoid valve for industrial filtration according to claim 1, characterized in that, The inner wall of the transmission sleeve is slidably fitted with a sliding block via an auxiliary sliding groove, and a positioning block is fixedly installed on the inner wall of the sliding block.

9. The sealing structure of a low-temperature resistant solenoid valve for industrial filtration according to claim 8, characterized in that, The inner wall of the sliding block is provided with a rotating sleeve, the outer wall of the rotating sleeve is provided with an external thread, the positioning block is slidably installed inside the external thread, and a cleaning wheel is fixedly installed on one side of the rotating sleeve.

10. The sealing structure of a low-temperature resistant solenoid valve for industrial filtration according to claim 9, characterized in that, The transmission sleeve is fixedly installed inside, and the inner wall of the limiting sleeve is provided with a vertical slide rail.

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