Pressure-adjustable fire-fighting stop valve

Abstract

The pressure-adjustable fire-fighting stop valve comprises an upper valve body, an end cover is fixedly installed on the upper portion of the upper valve body, a butt joint pipe is fixedly installed on the side face of the upper valve body through a flange, a sealing valve block is installed in the middle of the interior of the upper valve body, and the purpose of opening and closing the valve is achieved by lifting and blocking a channel through the sealing valve block. A hollow cylindrical lower valve body is fixedly installed below the upper valve body, a piston plate which is in sliding fit with the lower valve body is installed at the upper end in the lower valve body, and a connecting rod is fixedly installed between the piston plate and the sealing valve block. According to the pressure-adjustable fire-fighting stop valve, when the valve is opened, an extrusion spring in the lower valve body is used for pushing an upper limiting plate to move upwards, so that the upper limiting plate drives a piston plate to synchronously move upwards, the piston plate is used for extruding an inner cavity of the lower valve body, pressure is applied to the interior of the upper valve body through a through hole, and the purpose of pressurization is achieved; and the pressurization degree can be adjusted through the adjusting mechanism, so that the purpose of adjusting the pressure is achieved.

Description

Technical Field

[0001] This invention relates to the field of fire shut-off valve technology, specifically an adjustable pressure fire shut-off valve. Background Technology

[0002] Fire shut-off valves are manually controlled valves installed in fire piping systems, such as fire hydrant systems and automatic sprinkler systems. Their core function is to manually shut off the water supply to a section of the building when it is necessary to repair or replace downstream fire equipment, without affecting the normal water supply to other fire-fighting areas of the building.

[0003] For example, Chinese patent application number CN201520277938.8 discloses a fire shut-off valve. The valve body has a valve body inlet and a valve body outlet. An upper valve stem is threaded into the valve body, and a handwheel is fixed to the upper end of the upper valve stem. The lower section of the upper valve stem is inserted into the upper section of the lower valve stem. A spring is provided between the upper and lower valve stems. A valve plate is fixed to the lower end of the lower valve stem. A limit pin is installed on the valve body, and a limit groove is formed on the upper valve stem. The valve body inlet and outlet are at a 90-degree angle, which can change the direction of medium flow and reduce the risk to personal safety. The opening and closing mechanism opens slowly, causing the pressure to rise gradually, reducing the sudden pressure increase at the moment of opening, thus protecting personal safety.

[0004] For example, in the prior art, Chinese patent application number CN201510540286.7 discloses a spring-loaded fire shut-off valve and a quick-opening and closing device. The spring-loaded fire shut-off valve includes a valve body, a bracket, an end cover, an upper valve stem, a spring, a lower valve stem, and a valve core. The quick-opening and closing device includes a spring clamp and a fire-fighting high-pressure water gun. The lower end of the upper valve stem and the upper end of the lower valve stem are respectively placed in the spring cavity in the bracket, and the two are subjected to the spring force. The upper end of the upper valve stem is located outside the spring cavity, and the lower end of the lower valve stem is connected to the valve core. The valve core plane presses against the valve body valve sealing plane to form the valve closed state. The spring clamp is fixedly installed on the upper part of the shut-off valve. The upper end of the upper valve stem passes through the bottom hole of the spring clamp and extends into the clamp. The fire-fighting high-pressure water gun is engaged in the spring clamp and presses against the top of the upper valve stem.

[0005] For example, in the prior art, Chinese patent application number CN202122345609.0 discloses a novel shut-off valve, including a shut-off valve body, an inlet and an outlet on the shut-off valve body, a sealing valve seat fixedly installed inside the shut-off valve body, a shut-off valve cover connected to the shut-off valve body by bolts, a shut-off valve adjusting rod provided on the shut-off valve cover, a first thread provided at the connection between the shut-off valve adjusting rod and the shut-off valve cover, and one end of the shut-off valve adjusting rod extending to the outside of the shut-off valve cover and the other end extending into the inside of the shut-off valve body.

[0006] Based on the above information, it can be seen that the existing gate valves used in the water supply pipelines of fire protection systems have the following defects in actual use: the outlet pressure cannot be adjusted. Due to its design, the gate valve may not be able to provide a stable and adjustable output pressure during use. The valve design structure is usually optimized for the outlet of the flow channel, and when the required pressure changes, the outlet pressure may not be adjustable, resulting in the outlet pressure not changing with the fire situation. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable pressure fire shut-off valve to solve the problem of pressure inability to be adjusted mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an adjustable pressure fire shut-off valve, comprising an upper valve body with an end cap fixedly mounted on top, a connecting pipe fixedly mounted on the side of the upper valve body using a flange, a sealing valve block installed in the middle of the upper valve body, the valve opening and closing purpose achieved by the sealing valve block lifting and blocking the channel, a hollow cylindrical lower valve body fixedly mounted below the upper valve body, a piston plate mounted and slidingly fitted to the upper end of the lower valve body, a connecting rod fixedly mounted between the piston plate and the sealing valve block, and a through hole communicating with the lower valve body at the lower end of the upper valve body, the upper limit plate being pushed upward by a compression spring inside the lower valve body, thereby causing the upper limit plate to drive the piston plate to move upward synchronously, the piston plate compressing the internal cavity of the lower valve body, applying pressure to the interior of the upper valve body through the through hole, an adjustment mechanism being provided inside the lower valve body, the adjustment mechanism applying pressure to the piston plate to pressurize the interior of the upper valve body, a sealing ring being fixedly mounted on the outer surface of the sealing valve block, and an air blowing mechanism for blowing air into the sealing ring being provided on the upper surface of the sealing valve block.

[0009] Preferably, the adjusting mechanism includes an upper limit plate and a lower limit plate installed inside the lower valve body.

[0010] Preferably, the upper limit plate is fixedly installed at the lower end of the piston plate, and the lower limit plate and the lower valve body form an up-and-down sliding structure.

[0011] Preferably, a compression spring is fixedly installed between the upper limit plate and the lower limit plate, and an adjusting bolt for moving up and down is installed inside the lower limit plate by its internal thread. The adjusting bolt is rotatably connected to the lower valve body, and an adjusting knob located outside the lower valve body is fixedly installed at the lower end of the adjusting bolt. Rotating the adjusting knob at the lower end of the lower valve body causes the adjusting bolt to rotate, and the threaded connection between the adjusting bolt and the lower limit plate causes the lower limit plate to move upward, thereby compressing the compression spring. After compression, the spring's elasticity increases, increasing the compressive force on the piston plate.

[0012] Preferably, the lower limit plate has limit grooves on its left and right sides. The limit grooves are inserted and slide with the limit strip fixedly installed on the inner wall of the lower valve body. During the up and down movement of the lower limit plate, the limit grooves on its left and right sides slide relative to the limit strip inside the lower valve body. The lower limit plate is prevented from rotating by the cooperation between the limit grooves and the limit strip.

[0013] Preferably, a mounting base is fixedly installed on the upper surface of the connecting pipe, and a pressure valve for real-time monitoring of the internal pressure of the upper valve body is installed after the sealing plug in the mounting base is removed.

[0014] Preferably, the air-blowing mechanism includes a rubber diaphragm flap fixedly installed at the middle position of the upper surface of the sealing valve block. The rubber diaphragm flap is made of self-rebounding elastic rubber. The sealing valve block has an internal cavity for storing air, which is connected to the rubber diaphragm flap. The side of the sealing valve block has a connecting hole corresponding to the sealing ring, which is connected to the internal cavity through the connecting hole. The position of the sealing valve block corresponds vertically to the position of the opening and closing valve rod. A compression block for squeezing the rubber diaphragm flap is fixedly installed at the lower end of the opening and closing valve rod. When the rubber diaphragm flap is squeezed, it applies pressure to the internal cavity. The compression block squeezes the rubber diaphragm flap on the upper surface of the sealing valve block, and the deformation of the sealing diaphragm flap squeezes it into the internal cavity, allowing the air in the internal cavity to enter the sealing ring through the connecting hole. The sealing ring is a hollow rubber structure that can expand and deform. At this time, the sealing ring expands and deforms, achieving a better sealing effect.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the adjustable pressure fire shut-off valve adopts a novel structural design, the specific details of which are as follows: 1. When the valve is opened, the compression spring inside the lower valve body pushes the upper limit plate to move upward, which in turn causes the upper limit plate to drive the piston plate to move upward synchronously. The piston plate compresses the internal cavity of the lower valve body and applies pressure to the inside of the upper valve body through the through hole, thereby achieving the purpose of pressurization. The degree of pressurization can be adjusted by the adjustment mechanism to achieve the purpose of adjusting the pressure. Furthermore, by rotating the adjustment knob at the lower end of the lower valve body, the adjustment knob drives the adjustment bolt to rotate, and the threaded connection between the adjustment bolt and the lower limit plate drives the lower limit plate to move upward, thereby compressing the compression spring. After the compression spring is compressed, its elasticity increases, increasing the compression force on the piston plate, thereby adjusting the pressure applied to the upper valve body and ultimately achieving the purpose of adjusting the outlet pressure. Furthermore, during the up-and-down movement of the lower limit plate, the limiting grooves on its left and right sides slide relative to the limiting strip inside the lower valve body, using the cooperation between the limiting grooves and the limiting strip to limit the movement and prevent the lower limit plate from rotating.

[0016] 2. When closing the valve, the valve stem moves the extrusion block downwards, and the extrusion block eventually moves the sealing valve block downwards to achieve the purpose of sealing and closing. At this time, the extrusion block squeezes the rubber diaphragm on the upper surface of the sealing valve block, and uses the deformation of the sealing diaphragm to squeeze into the inner cavity, so that the air in the inner cavity enters the sealing ring through the connecting hole. The sealing ring is a hollow rubber structure that can expand and deform. At this time, the sealing ring expands and deforms to achieve a better sealing effect. Furthermore, the sealing ring is a hollow, deformable structure that expands when sealed, whereas traditional solid sealing rings suffer from elastic fatigue over long-term use, affecting the sealing effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the sealing valve block in the closed state of the present invention; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the internal structure of the valve body of the present invention; Figure 6 This is a schematic diagram of the piston plate structure of the present invention; Figure 7 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the internal structure of the sealing valve block of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C.

[0018] In the diagram: 1. Upper valve body; 2. End cap; 3. Connecting pipe; 4. Opening / closing valve stem; 5. Extrusion block; 6. Sealing valve block; 7. Lower valve body; 8. Connecting rod; 9. Piston plate; 10. Through hole; 11. Upper limit plate; 12. Lower limit plate; 13. Extrusion spring; 14. Adjusting bolt; 15. Adjusting knob; 16. Limiting groove; 17. Limiting strip; 18. Sealing ring; 19. Inner cavity; 20. Connecting hole; 21. Rubber diaphragm flap; 22. Mounting base. Detailed Implementation

[0019] 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.

[0020] Example 1: Please refer to Figures 1-7 To achieve the purpose of regulating outlet pressure, this embodiment provides the following technical solution, specifically: an upper valve body 1 with an end cap 2 fixedly installed on top; a connecting pipe 3 fixedly installed on the side of the upper valve body 1 using a flange; a sealing valve block 6 installed in the middle of the upper valve body 1; the valve opening and closing purpose is achieved by the sealing valve block 6 lifting and lowering to block the channel; a hollow cylindrical lower valve body 7 fixedly installed below the upper valve body 1; a piston plate 9 that slides and fits against the upper end of the lower valve body 7; a connecting rod 8 fixedly installed between the piston plate 9 and the sealing valve block 6; and a through hole 10 communicating with the lower valve body 7 at the lower end of the upper valve body 1; an adjusting mechanism is provided inside the lower valve body 7; the adjusting mechanism applies pressure to the piston plate 9, causing the piston plate 9 to pressurize the upper valve body 1; the adjusting mechanism includes components installed inside the lower valve body 7. The upper limit plate 11 and lower limit plate 12 of the valve body are fixedly installed. The upper limit plate 11 is fixedly installed at the lower end of the piston plate 9. The lower limit plate 12 and the lower valve body 7 form an up-and-down sliding structure. A compression spring 13 is fixedly installed between the upper limit plate 11 and the lower limit plate 12. An adjusting bolt 14 for driving its up-and-down movement is installed inside the lower limit plate 12. The adjusting bolt 14 is rotatably connected to the lower valve body 7. An adjusting knob 15 located outside the lower valve body 7 is fixedly installed at the lower end of the adjusting bolt 14. Limiting grooves 16 are opened on the left and right sides of the lower limit plate 12. The limiting grooves 16 are embedded and slid with the limiting strip 17 fixedly installed on the inner wall of the lower valve body 7. An installation seat 22 is fixedly installed on the upper surface of the connecting pipe 3. After removing the sealing plug in the installation seat 22, a pressure valve for real-time monitoring of the internal pressure of the upper valve body 1 is installed.

[0021] When using the device, it is connected to the fire pipeline using a flange structure. To open the valve, the valve stem 4 is rotated. Because the valve stem 4 is threadedly connected to the end cover 2, rotating the valve stem 4 causes it to move upwards, releasing the limit on the sealing valve block 6. At this time, the sealing valve block 6 moves upwards under the elastic push of the compression spring 13, opening the internal passage of the upper valve body 1, thus opening the valve. Simultaneously, the compression spring 13 pushes the piston plate 9 upwards via the upper limit plate 11. The space above the piston plate 9 is connected to the interior of the upper valve body 1 through the through hole 10, so the upward movement of the piston plate 9 pressurizes the interior of the upper valve body 1. The sealing plug in the mounting seat 22 on the upper surface of the connecting pipe 3 is removed, and a pressure valve is installed in the mounting seat 22 using a threaded structure. The pressure valve monitors the pressure value in the pipeline in real time. When it is necessary to adjust the outlet pressure of the upper valve body 1, the valve is opened. The bottom cover of the lower valve body 7 is rotated using a tool. The adjustment knob 15 at the bottom is rotated, which causes the adjustment bolt 14 to rotate relative to the lower valve body 7. Since the adjustment bolt 14 is threadedly connected to the lower limit plate 12, the rotation of the adjustment bolt 14 causes the lower limit plate 12 to move upward. When the lower limit plate 12 moves upward, the limiting grooves 16 on its left and right sides cooperate with the limiting strips 17 on the inner wall of the lower valve body 7 to prevent the lower limit plate 12 from rotating. The upward movement of the lower limit plate 12 compresses the compression spring 13. After the compression spring 13 is compressed, its elasticity increases, so the pressure it applies to the piston plate 9 increases. Finally, the pressure of the piston plate 9 on the space above it increases, increasing the pressure inside the upper valve body 1, thus achieving the purpose of adjusting the internal pressure of the valve body. In this way, the pressure inside the valve body is adjusted by changing the compression amount of the compression spring 13.

[0022] Example 2: Please refer to Figures 8-9 In order to improve the sealing effect, this embodiment provides the following technical solution, which specifically discloses: a sealing ring 18 is fixedly installed on the outer surface of the sealing valve block 6, and an air blowing mechanism for blowing air into the sealing ring 18 is provided on the upper surface of the sealing valve block 6. The air blowing mechanism includes a rubber diaphragm flap 21 fixedly installed in the middle position of the upper surface of the sealing valve block 6. The rubber diaphragm flap 21 is made of self-rebound elastic rubber. An inner cavity 19 for storing air is opened inside the sealing valve block 6. The inner cavity 19 is connected to the rubber diaphragm flap 21. A connecting hole 20 corresponding to the sealing ring 18 is opened on the side of the sealing valve block 6. The sealing ring 18 is connected to the inner cavity 19 through the connecting hole 20. The position of the sealing valve block 6 corresponds vertically to the position of the opening and closing valve rod 4. A squeezing block 5 for squeezing the rubber diaphragm flap 21 is fixedly installed at the lower end of the opening and closing valve rod 4. When the rubber diaphragm flap 21 is squeezed, pressure is applied to the inner cavity 19.

[0023] When closing the valve, the valve stem 4 is rotated in the opposite direction. At this time, the valve stem 4 moves downward and uses the squeezing block 5 at its lower end to squeeze the sealing valve block 6, eventually pushing the sealing valve block 6 downward to the sealing position, thus achieving the purpose of closing the valve. At this time, the squeezing block 5 simultaneously squeezes the rubber diaphragm flap 21 on the upper surface of the sealing valve block 6. The deformation of the rubber diaphragm flap 21 pressurizes the inner cavity 19. At this time, some of the air in the inner cavity 19 is squeezed into the sealing ring 18 through the connecting hole 20. The filling of gas causes the sealing ring 18 to expand, improving the sealing effect of the sealing ring 18.

[0024] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-adjustable fire shut-off valve, comprising an upper valve body (1) with an end cap (2) fixedly mounted on its top, and a connecting pipe (3) fixedly mounted on the side of the upper valve body (1) using a flange, characterized in that, Also includes: A sealing valve block (6) is installed in the middle of the upper valve body (1). The valve can be opened and closed by the sealing valve block (6) lifting and blocking the channel. A hollow cylindrical lower valve body (7) is fixedly installed below the upper valve body (1). A piston plate (9) is installed inside the upper end of the lower valve body (7) and slides against it. A connecting rod (8) is fixedly installed between the piston plate (9) and the sealing valve block (6). A through hole (10) communicating with the lower valve body (7) is opened at the lower end of the upper valve body (1). An adjustment mechanism is provided inside the lower valve body (7). The adjustment mechanism applies pressure to the piston plate (9) so that the piston plate (9) pressurizes the upper valve body (1). A sealing ring (18) is fixedly installed on the outer surface of the sealing valve block (6), and an air blowing mechanism for blowing air into the sealing ring (18) is provided on the upper surface of the sealing valve block (6).

2. The adjustable pressure fire shut-off valve according to claim 1, characterized in that: The adjustment mechanism includes an upper limit plate (11) and a lower limit plate (12) installed inside the lower valve body (7).

3. The adjustable pressure fire shut-off valve according to claim 2, characterized in that: The upper limit plate (11) is fixedly installed at the lower end of the piston plate (9), and the lower limit plate (12) and the lower valve body (7) form an up-and-down sliding structure.

4. The adjustable pressure fire shut-off valve according to claim 3, characterized in that: A compression spring (13) is fixedly installed between the upper limit plate (11) and the lower limit plate (12), and an adjusting bolt (14) for driving it to move up and down is installed inside the lower limit plate (12). The adjusting bolt (14) is rotatably connected to the lower valve body (7), and an adjusting knob (15) located outside the lower valve body (7) is fixedly installed at the lower end of the adjusting bolt (14).

5. The adjustable pressure fire shut-off valve according to claim 4, characterized in that: The lower limit plate (12) has limit grooves (16) on its left and right sides, and the limit grooves (16) are embedded and slide with the limit strip (17) fixedly installed on the inner wall of the lower valve body (7).

6. The adjustable pressure fire shut-off valve according to claim 1, characterized in that: The upper surface of the connecting pipe (3) is fixedly installed with a mounting base (22). After removing the sealing plug in the mounting base (22), a pressure valve for real-time monitoring of the internal pressure of the upper valve body (1) is installed.

7. The adjustable pressure fire shut-off valve according to claim 1, characterized in that: The air-blowing mechanism includes a rubber diaphragm flap (21) fixedly installed at the middle position on the upper surface of the sealing valve block (6). The rubber diaphragm flap (21) is made of self-rebounding elastic rubber material.

8. The adjustable pressure fire shut-off valve according to claim 7, characterized in that: The sealing valve block (6) has an inner cavity (19) for storing air, and the inner cavity (19) is connected to the rubber diaphragm flap (21).

9. The adjustable pressure fire shut-off valve according to claim 8, characterized in that: The sealing valve block (6) has a connecting hole (20) on its side that corresponds to the sealing ring (18). The sealing ring (18) is connected to the inner cavity (19) through the connecting hole (20).

10. The adjustable pressure fire shut-off valve according to claim 9, characterized in that: The position of the sealing valve block (6) corresponds vertically to the position of the opening and closing valve rod (4). The lower end of the opening and closing valve rod (4) is fixedly equipped with a squeezing block (5) for squeezing the rubber diaphragm flap (21). When the rubber diaphragm flap (21) is squeezed, it applies pressure to the inner cavity (19).

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