Self-sealing civil defense gate valve

Abstract

The utility model discloses a self-sealing civil defense gate valve in the field of civil defense gate valves, which comprises a valve body, a gate and a hand wheel mechanism used for driving the gate to open or close, the valve body comprises a valve casing, a front pipeline and a rear pipeline, and a channel for the gate to move is arranged in the valve casing. The front pipeline and the rear pipeline are oppositely arranged at the bottom of the valve shell and communicate with the channel, connecting flanges are arranged at the outward ends of the front pipeline and the rear pipeline correspondingly, annular bosses are arranged at the inward ends of the front pipeline and the rear pipeline correspondingly, stepped grooves are formed in the end faces of the annular bosses, and the two oppositely-arranged stepped grooves form a first sealing groove capable of containing the edge of the inserting plate. An annular groove is formed in the side, facing the inserting plate, of the annular boss, an I-shaped sealing gasket is arranged in the annular groove, the top of the inserting plate is fixedly connected with the hand wheel mechanism and detachably connected with the valve shell through a sealing seat, and a second sealing groove is formed in the position, corresponding to the sealing seat, of the top of the valve shell. The pressure-resistant shock-wave-resistant valve has good pressure-resistant capacity and shock-wave-resistant capacity.

Description

Technical Field

[0001] This utility model belongs to the technical field of civil defense access valves, and specifically relates to a self-sealing civil defense access valve. Background Technology

[0002] A civil defense access valve is a ventilation control device specifically designed for civil defense projects (air defense projects). It is primarily used to regulate or cut off the flow of air, dust, and other media, ensuring the safe and reliable operation of ventilation systems in underground spaces (such as air-raid shelters, basements, and civil defense bunkers). Its core functions are protection and airtightness, guaranteeing a safe environment for personnel during wartime or emergencies.

[0003] Traditional air defense gate valves mainly rely on simple O-rings / flat gaskets as the main seal. Their drawback is that this type of seal is prone to failure, extrusion, or permanent deformation under high pressure, especially under alternating shock wave loads, resulting in low reliability. Utility Model Content

[0004] The purpose of this invention is to provide a self-sealing anti-slip valve with good pressure resistance, shock wave resistance and long service life, which solves the problem of poor reliability of the main seal.

[0005] The purpose of this utility model is achieved as follows: A self-sealing air-raid shelter slide valve includes a valve body, a slide plate, and a handwheel mechanism for driving the slide plate to open or close. The valve body includes a valve shell, a front pipe, and a rear pipe. The valve shell has a channel for the slide plate to move. The front pipe and the rear pipe are arranged opposite to each other at the bottom of the valve shell and communicate with the channel. The outward-facing ends of the front pipe and the rear pipe are each provided with a connecting flange, and the inward-facing ends are each provided with an annular boss. The end face of the annular boss has a stepped groove. Two opposite stepped grooves form a sealing groove one that can accommodate the edge of the slide plate. The side of the annular boss facing the slide plate has an annular groove. An I-shaped sealing gasket is provided in the annular groove. The top of the slide plate is fixedly connected to the handwheel mechanism and detachably connected to the valve shell through a sealing seat. The top of the valve shell has a sealing groove two corresponding to the sealing seat.

[0006] In use, this invention uses a handwheel mechanism to drive the slide plate and sealing seat downwards. When the slide plate closes, its edge sinks into the sealing groove to form the main sealing surface. When encountering high pressure or air waves, the air pressure in the pipeline acts on the slide plate, pushing it towards the I-shaped sealing gasket. This causes the I-shaped sealing gasket to undergo elastic deformation, filling the microscopic gaps in the main sealing surface and forming a tight contact. The higher the pressure, the greater the elastic deformation of the I-shaped sealing gasket, resulting in a greater sealing force and thus creating a "pressure self-tightening" effect. The slide plate and valve body are sealed through the sealing seat and sealing groove to prevent the medium from leaking from the top drive mechanism. Compared with the prior art, the beneficial effects of this utility model are as follows: It cleverly utilizes the pressure of the medium itself within the pipeline to enhance the sealing effect. Even if the initial pre-tightening force is insufficient, the medium pressure can dynamically compensate for the sealing force, preventing leakage. The stepped groove on the end face of the annular boss forms a sealing groove that can accommodate the edge of the slide plate, providing a physical barrier and support for the slide plate, enhancing its stability under pressure, preventing displacement and excessive deformation, and further improving the overall strength and sealing reliability of the valve under extreme pressure fluctuations. The annular boss not only serves to install the sealing components but also increases the strength at the connection between the pipeline and the valve body, improving the overall pressure-bearing capacity and deformation resistance of the valve. The channel provides good guidance for the slide plate, and combined with the support of the sealing groove for the slide plate edges, the slide plate operates smoothly and is subjected to uniform force during opening and closing, making it less prone to jamming or deformation.

[0007] As a further improvement of this utility model, the sealing seat has an inverted convex shape, with a through groove in the center to allow the insert plate to pass through, and an annular sealing gasket at the bottom.

[0008] As a further improvement of this utility model, the connecting flange, valve body, front pipe and rear pipe are connected as one unit by welding.

[0009] As a further improvement of this utility model, the sealing seat is provided with a number of fasteners, and the valve body is provided with fixing holes corresponding to the fasteners.

[0010] As a further improvement of this utility model, the fastener includes a fastening screw and a fastening nut, wherein the fastening screw passes through a fixing hole and is threadedly connected to the fastening nut to lock the sealing seat onto the valve body.

[0011] As a further improvement of this utility model, several reinforcing plates are provided on both sides of the valve body.

[0012] As a further improvement of this utility model, the handwheel mechanism includes a threaded valve stem, with a handwheel at the upper end of the threaded valve stem and the lower end rotatably mounted on a sealing seat via a bearing.

[0013] As a further improvement of this utility model, the handwheel mechanism is supported on the valve body by a support base. The support base includes two rectangular plates arranged symmetrically to each other. An inclined plate is provided on the side of the rectangular plate along its diagonal. Several triangular plates are arranged sequentially from top to bottom on both sides of the inclined plate. A mounting platform is provided on the top of the two rectangular plates. An internal thread that mates with the threaded valve stem is provided in the mounting platform. Attached Figure Description

[0014] Figure 1 This is the front view of the present invention.

[0015] Figure 2 This is a side view of the present invention.

[0016] Figure 3 for Figure 1 Sectional view at point AA.

[0017] Figure 4 for Figure 2 Sectional view at point BB.

[0018] Figure 5 for Figure 3 A magnified view of point C in the middle.

[0019] The components are as follows: 1. Insert plate; 2. Valve body; 3. Front pipe; 4. Rear pipe; 5. Reinforcing plate; 6. Connecting flange; 7. Annular boss; 8. Stepped groove; 9. Sealing groove one; 10. Annular groove; 11. I-shaped sealing gasket; 12. Sealing seat; 13. Sealing groove two; 14. Threaded valve stem; 15. Handwheel; 16. Rectangular plate; 17. Inclined plate; 18. Triangular plate; 19. Mounting platform; 20. Annular sealing gasket; 21. Fastening screw; 22. Fastening nut. Detailed Implementation

[0020] like Figure 1-5 As shown, a self-sealing air-raid shelter slide valve includes a valve body, a slide 1, and a handwheel mechanism for driving the slide 1 to open or close. The valve body includes a valve shell 2, a front pipe 3, and a rear pipe 4. Two reinforcing plates 5 are provided on both sides of the valve shell 2, and a channel for the slide 1 to move is opened inside the valve shell 2. The front pipe 3 and the rear pipe 4 are arranged opposite to each other at the bottom of the valve shell 2 and communicate with the channel. A connecting flange 6 is provided at the outward end of the front pipe 3 and the rear pipe 4, and an annular boss 7 is provided at the inward end. A stepped groove 8 is opened on the end face of the annular boss 7. The two opposite stepped grooves 8 form a sealing groove 9 that can accommodate the edge of the slide 1. An annular groove 10 is opened on the side of the stepped groove 8 facing the slide 1. An I-shaped sealing gasket 11 is provided in the annular groove 10. The top of the slide 1 is fixedly connected to the handwheel mechanism and detachably connected to the valve shell 2 through a sealing seat 12. A sealing groove 13 is opened on the top of the valve shell 2 corresponding to the sealing seat 12.

[0021] The handwheel mechanism includes a threaded valve stem 14, with a handwheel 15 mounted on its upper end and a bearing rotatably mounted on a sealing seat 12 at its lower end. The handwheel mechanism is supported on the valve body by a support base, which includes two symmetrically arranged rectangular plates 16. Inclined plates 17 are arranged along the diagonals of the sides of each rectangular plate 16. Two triangular plates 18 are arranged sequentially from top to bottom on both sides of the inclined plates 17. A mounting platform 19 is mounted on the top of the two rectangular plates 16, and the mounting platform 19 has internal threads that mate with the threaded valve stem 14. The inclined plates 17 effectively distribute and transfer the force borne by the mounting platform 19 (mainly the axial force transmitted by the valve stem thread) to a wider area of ​​the two rectangular plates 16 and the valve body. The design of the inclined plates 17 also alters the force flow path of the support base, making it more similar to a truss structure, greatly improving the structure's resistance to bending and torsional deformation.

[0022] The sealing seat 12 has an inverted U-shaped structure with a through groove in the center that allows the insert plate 1 to pass through, and an annular sealing gasket 20 at the bottom. The outer wall of the bottom flange of the sealing seat 12 is tightly fitted with the inner wall of the sealing groove 13 of the valve body 2, forming the first barrier to prevent the leakage of the medium or the entry of external contaminants into the cavity of the valve body 2.

[0023] To resist impact and high pressure and ensure the valve's survivability under extreme civil defense conditions, welding is used to connect the connecting flange 6, valve body 2, front pipe 3, and rear pipe 4 into one unit.

[0024] The sealing seat 12 is provided with eight fasteners, and the valve body 2 has corresponding fixing holes for the fasteners. The fasteners include a fastening screw 21 and a fastening nut 22. The fastening screw 21 passes through the fixing hole and is threaded to the fastening nut 22, locking the sealing seat 12 onto the valve body 2. This provides an adjustable and powerful axial force, ensuring the reliability of the seal and resistance to pressure and impact.

[0025] In use, rotating the handwheel 15 drives the threaded valve stem 14 to rotate, pushing the sealing seat 12 and the slide plate 1 downwards. The edge of the slide plate 1 inserts into the sealing groove 9 of the annular bosses 7 on both sides. The edge of the slide plate 1 presses against the double-lip structure of the I-shaped sealing ring, forming a basic seal. When the pressure of the medium in the pipeline acts on the slide plate 1, it pushes the slide plate 1 to press tightly against the sealing lip and the groove wall. The higher the pressure, the stronger the sealing performance. The inverted U-shaped top flange of the sealing seat 12 presses against the sealing groove 13 of the valve body 2, forming a double seal. Reversing the handwheel 15, the threaded valve stem 14 drives the slide plate 1 to be fully lifted to the top of the channel. The edge of the slide plate 1 disengages from the bottom sealing groove 9, and the medium can freely pass through the front and rear pipelines 4. When the valve stem rotates, the lower bearing causes the sealing seat 12 to move only in a linear motion. The advantages of this invention are: it maintains zero leakage under explosive impact and biological and chemical pollution, and meets the requirements of wartime protection, rapid response, and maintenance-free operation throughout the entire process.

[0026] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A self-sealing civil defense flapper valve comprising a valve body, a flapper, and a hand wheel mechanism for driving the flapper to open or close, characterized in that, The valve body includes a valve shell, a front pipe, and a rear pipe. The valve shell has a channel for the movement of a slide plate. The front pipe and the rear pipe are positioned opposite each other at the bottom of the valve shell and communicate with the channel. Each of the front pipe and the rear pipe has a connecting flange at its outward end and an annular boss at its inward end. The annular boss has a stepped groove on its end face. Two opposite stepped grooves form a sealing groove I that can accommodate the edge of the slide plate. The annular boss has an annular groove on the side facing the slide plate, and an I-shaped sealing gasket is placed in the annular groove. The top of the slide plate is fixedly connected to a handwheel mechanism and detachably connected to the valve shell through a sealing seat. The top of the valve shell has a sealing groove II corresponding to the sealing seat.

2. The self-sealing anti-slip valve according to claim 1, characterized in that, The sealing seat has an inverted U-shaped structure with a through groove in the center that allows the insert plate to pass through, and an annular sealing gasket at the bottom.

3. The self-sealing civil defense panel valve of claim 1, wherein, The connecting flange, valve body, front pipe, and rear pipe are connected as one unit by welding.

4. The self-sealing civil defense insert panel valve of claim 1, wherein, The sealing seat is provided with several fasteners, and the valve body has fixing holes corresponding to the fasteners.

5. The self-sealing civil defense panel valve according to claim 4, wherein, The fastener includes a fastening screw and a fastening nut. The fastening screw passes through a fixing hole and is threadedly connected to the fastening nut to lock the sealing seat onto the valve body.

6. The self-sealing civil defense panel valve of claim 1, wherein, Several reinforcing plates are provided on both sides of the valve body.

7. The self-sealing civil defense panel valve of claim 1, wherein, The handwheel mechanism includes a threaded valve stem, with a handwheel at the upper end and the lower end rotatably mounted on a sealing seat via a bearing.

8. A self-sealing anti-slip valve according to claim 7, characterized in that, The handwheel mechanism is supported on the valve body by a support base. The support base includes two rectangular plates arranged symmetrically to each other. An inclined plate is provided on the side of the rectangular plate along its diagonal. Several triangular plates are arranged sequentially from top to bottom on both sides of the inclined plate. A mounting platform is provided on the top of the two rectangular plates. An internal thread that mates with the threaded valve stem is provided in the mounting platform.

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