Electromagnetic stop valve of toxic gas pipeline

Abstract

The utility model provides an electromagnetic stop valve of a toxic gas pipeline, which belongs to the technical field of electromagnetic valves and comprises a valve body, a valve seat arranged in the valve body, a valve core matched with the valve seat, an electromagnetic driving mechanism for driving the valve core to act and a sealing component. The sealing assembly comprises a detachable main sealing ring and an auxiliary sealing ring, the main sealing ring is embedded in an annular clamping groove in the end of the valve element, internal threads are arranged on the groove wall of the annular clamping groove, and external threads matched with the internal threads are arranged on the outer side of the main sealing ring. The main sealing ring is of a sectional structure and is formed by splicing at least two arc-shaped sealing sections end to end, the splicing face of each arc-shaped sealing section is of an inclined face structure, and a sealing glue layer is arranged between the splicing faces of the adjacent arc-shaped sealing sections. A detachable anti-corrosion lining is arranged on the inner wall of the valve body; the problems that a traditional sealing structure is difficult to replace or clean quickly, high in maintenance cost and inconvenient to operate can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, and specifically relates to an electromagnetic shut-off valve for toxic gas pipelines. Background Technology

[0002] In industries such as chemical engineering, semiconductor manufacturing, and biopharmaceuticals, the safe transmission of toxic gases (such as chlorine, phosgene, and ammonia) places extremely high demands on valve sealing technology. Currently, most mainstream electromagnetic gate valves on the market employ traditional sealing structures. The sealing rings of these traditional gate valves are often integrally designed, fixed to the valve core via interference fit or adhesive bonding. This structure has revealed serious defects in practical use. For example, gate valves used in phosgene delivery systems employ integral fluororubber sealing rings, requiring replacement every 6 months. During disassembly and maintenance, it was found that 30% of the valve core surface was corroded or even scratched, requiring additional grinding and repair, significantly increasing maintenance time costs. Furthermore, current international standards are increasingly stringent regarding valve leakage rates (Class A standards require a leakage rate ≤1×10⁻⁶). -9 m 3 However, existing technologies cannot simultaneously meet the requirements of rapid maintenance (seal replacement within 30 minutes), low leakage rate, long service life (seal replacement cycle ≥ 1 year) and low cost (maintenance cost ≤ 15% of procurement cost); therefore, existing technologies have the problems of traditional sealing structures being difficult to replace or clean quickly, high maintenance costs and inconvenient operation. Utility Model Content

[0003] In view of this, the present invention provides an electromagnetic shut-off valve for toxic gas pipelines, which can solve the problems of traditional sealing structures being difficult to replace or clean quickly, having high maintenance costs, and being inconvenient to operate.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an electromagnetic shut-off valve for a toxic gas pipeline, including a valve body, a valve seat disposed in the valve body, a valve core cooperating with the valve seat, an electromagnetic drive mechanism for driving the valve core to move, and a sealing assembly. The sealing assembly includes a detachable first sealing ring and a second sealing ring. The first sealing ring is embedded in an annular groove at the end of the valve core. The groove wall of the annular groove is provided with an internal thread, and the outer side of the first sealing ring is provided with an external thread that cooperates with the internal thread.

[0006] The technical advantages of the electromagnetic shut-off valve for toxic gas pipelines provided by this utility model are as follows: By setting a detachable sealing component, the sealing ring and valve core can be separated non-destructively through threaded connection, which facilitates the replacement of easily damaged seals, reduces maintenance time, and the threaded structure can prevent the seals from sticking to the valve core due to corrosion, protect the valve core base, and extend service life. At the same time, the axial preload generated during the thread tightening process makes the sealing ring and valve seat fit more tightly, reducing the leakage rate.

[0007] Based on the above technical solution, the electromagnetic shut-off valve for a toxic gas pipeline of this utility model can be further improved as follows:

[0008] The first sealing ring adopts a segmented structure, which is composed of at least two arc-shaped sealing segments spliced ​​end to end. The splicing surface of each arc-shaped sealing segment is a sloping structure, and a sealing adhesive layer is provided between the splicing surfaces of adjacent arc-shaped sealing segments.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting up multi-part segmented arc-shaped sealing sections, it is convenient to replace and can automatically align under pressure by using inclined splicing, thus compensating for the coaxiality error between the valve core and the valve seat.

[0010] Furthermore, the inner wall of the valve body is provided with a detachable anti-corrosion bushing, which is made of polytetrafluoroethylene material. The outer wall of the bushing has an annular protrusion, and the inner wall of the valve body has an annular groove that matches the annular protrusion.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a removable anti-corrosion bushing, toxic gases are isolated from the metal valve body, which facilitates replacement and maintenance and further improves the service life of the valve body.

[0012] Furthermore, a cleaning channel is provided between the valve seat and the valve body. One end of the cleaning channel is connected to the sealing surface between the valve seat and the valve core, and the other end extends to the outside of the valve body and is provided with a sealing plug.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting up a cleaning channel and injecting inert gas or cleaning fluid into the channel, cleaning can be completed without disassembling the valve, effectively shortening the maintenance cycle during use.

[0014] Furthermore, the cleaning channel includes a radial channel and an axial channel. The inner end of the radial channel is connected to the axial channel, and the outer end is provided with an internal thread interface. The sealing plug is threadedly connected to the internal thread interface.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are: by evenly distributing four outlets along the circumference of the valve seat through the axial channel, the cleaning fluid can be evenly covered on the sealing surface.

[0016] Furthermore, the electromagnetic drive mechanism includes an electromagnetic coil, a movable iron core, and a return spring. An isolation sleeve is fitted on the outside of the movable iron core. The isolation sleeve is made of corrosion-resistant metal material, and its two ends are sealed to the valve body and the outer shell of the electromagnetic coil, respectively.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are: by setting an isolation sleeve to isolate the coil from toxic gases, the durability of the coil is improved.

[0018] Furthermore, the inner wall of the isolation sleeve is provided with a nano-coating, which is composed of titanium dioxide nanoparticles and fluorocarbon resin, with a thickness of 10-20 μm.

[0019] Furthermore, the valve body is equipped with a quick-connect structure, which includes an outer sleeve, an inner sleeve, and a sealing gasket. The inner wall of the inner sleeve is provided with an annular retaining plate, and the inner wall of the outer sleeve is provided with a retaining groove that mates with the annular retaining plate. The inner sleeve and the outer sleeve are fixedly connected by a flange structure.

[0020] Furthermore, an O-ring is provided between the inner sleeve and the outer sleeve. The cross-sectional diameter of the O-ring is 3-5mm, and the compression rate is 15%-25%.

[0021] Furthermore, the valve core has a spiral guide groove on its stem, with a spiral angle of 30°-45° and a depth of 1-2mm.

[0022] The beneficial effect of adopting the above-mentioned improvement scheme is that the above design can reduce the wear of the sealing surface caused by fluid impact.

[0023] Compared with existing technologies, the advantages of the electromagnetic shut-off valve for toxic gas pipelines provided by this utility model are as follows: By setting a detachable sealing component, the sealing ring and valve core can be non-destructively separated through threaded connection, facilitating the replacement of easily damaged seals and reducing maintenance time. The threaded structure can prevent the seal from sticking to the valve core due to corrosion, protecting the valve core base and extending its service life. At the same time, the axial preload generated during thread tightening makes the sealing ring and valve seat fit more tightly, reducing the leakage rate. By setting a multi-part segmented arc-shaped sealing section, it is convenient to replace and can automatically align under pressure by using inclined splicing, compensating for the coaxiality error between the valve core and valve seat. By setting a detachable anti-corrosion bushing, toxic gas is isolated from the metal valve body, facilitating replacement and maintenance, and further improving the service life of the valve body. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an electromagnetic shut-off valve for a toxic gas pipeline;

[0026] Figure 2 Top view of the first sealing ring;

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 10. Valve body; 11. Valve seat; 12. Valve core; 13. Electromagnetic drive mechanism; 131. Electromagnetic coil; 132. Movable iron core; 1321. Isolation sleeve; 133. Return spring; 14. Sealing assembly; 141. First sealing ring; 1411. Arc-shaped sealing section; 142. Second sealing ring; 15. Corrosion-resistant bushing; 151. Annular protrusion; 152. Annular groove; 16. Cleaning channel; 161. Radial channel; 162. Axial channel; 17. Sealing plug; 18. Quick connection structure; 181. Outer sleeve; 182. Inner sleeve; 183. Sealing gasket. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0030] like Figure 1 Figure 2 shows an embodiment of an electromagnetic shut-off valve for a toxic gas pipeline provided by this utility model. In this embodiment, it includes a valve body 10, a valve seat 11 disposed in the valve body, a valve core 12 cooperating with the valve seat, an electromagnetic drive mechanism 13 for driving the valve core to move, and a sealing assembly 14. The sealing assembly includes a detachable first sealing ring 141 and a second sealing ring 142. The first sealing ring is embedded in an annular groove at the end of the valve core. The groove wall of the annular groove is provided with an internal thread, and the outer side of the first sealing ring is provided with an external thread that cooperates with the internal thread.

[0031] In the above technical solution, the first sealing ring 141 adopts a segmented structure, which is formed by splicing at least two arc-shaped sealing segments 1411 end to end. The splicing surface of each arc-shaped sealing segment is a sloping structure, and a sealing adhesive layer is provided between the splicing surfaces of adjacent arc-shaped sealing segments.

[0032] Among them, the adjacent sealing sections fill the gap by compression deformation, forming a "pressure self-tightening" mechanism, which further reduces the probability of leakage compared with traditional sealing structures.

[0033] Furthermore, in the above technical solution, the inner wall of the valve body is provided with a detachable anti-corrosion bushing 15, which is made of polytetrafluoroethylene material. The outer wall of the bushing is provided with an annular protrusion 151, and the inner wall of the valve body is provided with an annular groove 152 that cooperates with the annular protrusion.

[0034] During installation, the temperature difference caused the bushing to form an interference fit with the valve body (interference amount 0.05-0.1mm), and pressure tests showed no media penetration at 10MPa.

[0035] Furthermore, in the above technical solution, a cleaning channel 16 is provided between the valve seat and the valve body. One end of the cleaning channel is connected to the sealing surface between the valve seat and the valve core, and the other end extends to the outside of the valve body and is provided with a sealing plug 17.

[0036] Furthermore, in the above technical solution, the cleaning channel 16 includes a radial channel 161 and an axial channel 162. The inner end of the radial channel is connected to the axial channel, and the outer end is provided with an internal thread interface. The sealing plug is threadedly connected to the internal thread interface.

[0037] Furthermore, in the above technical solution, the electromagnetic drive mechanism 13 includes an electromagnetic coil 131, a movable iron core 132, and a return spring 133. An isolation sleeve 1321 is provided on the outside of the movable iron core. The isolation sleeve is made of corrosion-resistant metal material, and its two ends are respectively sealed to the valve body and the outer shell of the electromagnetic coil.

[0038] The isolation sleeve uses Hastelloy with a thermal conductivity of 16 W / (m·K), which reduces the coil temperature rise by 25% and extends the coil life to more than 5 years. The material thickness is 1.5 mm (skin depth > 2 mm), ensuring that the electromagnetic force transmission efficiency loss is < 5%.

[0039] Furthermore, in the above technical solution, the inner wall of the isolation sleeve is provided with a nano-coating, which is composed of titanium dioxide nanoparticles and fluorocarbon resin, and has a thickness of 10-20μm.

[0040] Furthermore, in the above technical solution, the valve body is provided with a quick connection structure 18, which includes an outer sleeve 181, an inner sleeve 182, and a sealing gasket 183. The inner side wall of the inner sleeve is provided with an annular retaining plate, and the inner side wall of the outer sleeve is provided with a retaining groove that mates with the annular retaining plate. The inner sleeve and the outer sleeve are fixedly connected by a flange structure.

[0041] Furthermore, in the above technical solution, an O-ring is provided between the inner sleeve and the outer sleeve. The cross-sectional diameter of the O-ring is 3-5mm, and the compression rate is 15%-25%.

[0042] Furthermore, in the above technical solution, the valve core rod is provided with a spiral guide groove, the spiral angle of which is 30°-45° and the depth is 1-2mm.

[0043] Specifically, the principle of this invention is as follows: When the main sealing ring needs to be replaced, first cut off the gas supply. Disassemble the valve seat, insert a tool into the operating hole at the end of the valve core, and rotate the valve core counterclockwise to loosen the threaded connection between the main sealing ring and the annular groove. Because the main sealing ring adopts a segmented structure, the sealing adhesive layer between each arc-shaped sealing segment separates under the action of rotational force, and the arc-shaped sealing segments can be removed one by one. The disassembled main sealing ring can be immersed in cleaning solution for ultrasonic cleaning. During installation, the arc-shaped sealing segments are inserted into the annular groove in sequence, and the valve core is rotated clockwise to make each sealing segment tightly spliced ​​through threaded engagement. The beveled splicing surface ensures automatic alignment during rotation, and the sealing adhesive layer reforms the seal under pressure. The auxiliary sealing ring adopts a lip structure. When the valve core and valve seat are closed, the medium pressure causes the lip to expand outward, forming a secondary seal with the inner wall of the valve body. This structure can maintain good sealing performance in a pressure range of 0.5-10MPa, and experimental data show that the leakage rate is less than 0.01%. The PTFE bushing on the inner wall of the valve body is installed using the principle of thermal expansion and contraction. Before installation, the bushing is cooled to -196°C in liquid nitrogen, causing it to shrink and be easily inserted into the valve body. After the temperature rises, the bushing expands and fits tightly against the inner wall of the valve body, with the annular protrusion embedding into the annular groove to form a sealing structure, effectively preventing media penetration.

[0044] When cleaning of the sealing surfaces is required, close the valve, open the sealing plug, and inject inert gas or cleaning fluid into the cleaning channel through the radial channel. The medium reaches the sealing surfaces of the valve seat and valve core along the axial channel, carrying away any residual toxic substances. After cleaning, purge the cleaning channel by introducing dry nitrogen gas.

Claims

1. An electromagnetic shut-off valve for a toxic gas pipeline, comprising a valve body, a valve seat disposed within the valve body, a valve core cooperating with the valve seat, an electromagnetic drive mechanism for driving the valve core, and a sealing assembly, characterized in that, The sealing assembly includes a detachable first sealing ring and a second sealing ring. The first sealing ring is embedded in an annular groove at the end of the valve core. The groove wall of the annular groove is provided with an internal thread, and the outer side of the first sealing ring is provided with an external thread that mates with the internal thread.

2. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 1, characterized in that, The first sealing ring adopts a segmented structure, which is composed of at least two arc-shaped sealing segments spliced ​​end to end. The splicing surface of each arc-shaped sealing segment is a sloping structure, and a sealing adhesive layer is provided between the splicing surfaces of adjacent arc-shaped sealing segments.

3. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 2, characterized in that, The inner wall of the valve body is provided with a detachable anti-corrosion bushing. The anti-corrosion bushing is made of polytetrafluoroethylene material. The outer wall of the bushing is provided with an annular protrusion, and the inner wall of the valve body is provided with an annular groove that matches the annular protrusion.

4. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 3, characterized in that, A cleaning channel is provided between the valve seat and the valve body. One end of the cleaning channel is connected to the sealing surface between the valve seat and the valve core, and the other end extends to the outside of the valve body and is provided with a sealing plug.

5. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 4, characterized in that, The cleaning channel includes a radial channel and an axial channel. The inner end of the radial channel is connected to the axial channel, and the outer end is provided with an internal thread interface. The sealing plug is threadedly connected to the internal thread interface.

6. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 5, characterized in that, The electromagnetic drive mechanism includes an electromagnetic coil, a movable iron core, and a return spring. An isolation sleeve is fitted on the outside of the movable iron core. The isolation sleeve is made of corrosion-resistant metal material, and its two ends are sealed to the valve body and the outer shell of the electromagnetic coil, respectively.

7. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 6, characterized in that, The inner wall of the isolation sleeve is coated with a nano-coating, which is composed of titanium dioxide nanoparticles and fluorocarbon resin, with a thickness of 10-20 μm.

8. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 7, characterized in that, The valve body is equipped with a quick-connect structure, which includes an outer sleeve, an inner sleeve, and a sealing gasket. The inner wall of the inner sleeve is provided with an annular retaining plate, and the inner wall of the outer sleeve is provided with a retaining groove that mates with the annular retaining plate. The inner sleeve and the outer sleeve are fixedly connected by a flange structure.

9. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 8, characterized in that, An O-ring is provided between the inner sleeve and the outer sleeve. The cross-sectional diameter of the O-ring is 3-5mm, and the compression rate is 15%-25%.

10. The electromagnetic shut-off valve for a toxic gas pipeline according to claim 9, characterized in that, The valve core has a spiral guide groove on its stem, with a spiral angle of 30°-45° and a depth of 1-2mm.

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