Selector valve of gas fire extinguishing system

Abstract

The invention relates to the technical field of gas fire extinguishing systems, in particular to a selector valve of a gas fire extinguishing system. The selector valve comprises a valve body and further comprises a movable pipe body, a piston ring is arranged on the outer side of the movable pipe body, a piston ring cavity matched with the piston ring is formed in the inner side of the valve body, one end of the movable pipe body is communicated with the input end of the valve body, and a blocking plate capable of blocking the other end of the movable pipe body is installed in the valve body. A movable pipe body reset spring is arranged between the movable pipe body and the valve body, when the other end of the movable pipe body is separated from the plugging plate, the other end of the movable pipe body is communicated with the output end of the valve body, and the valve body is provided with a first control gas circuit communicated with the input end of the valve body and a sixth control gas circuit communicated with the side, away from the input end of the valve body, of the piston ring cavity. And a gas path control structure is connected between the first control gas path and the sixth control gas path. The movement of the movable pipe body is controlled by using the pressure of system gas, the required external power is smaller, and an independent nitrogen cylinder group does not need to be used.

Description

Technical Field

[0001] The present invention relates to the technical field of gas fire extinguishing systems, and in particular to a selection valve for a gas fire extinguishing system. Background Art

[0002] Existing selector valves, such as Chinese patent CN205190765U, relate to a novel selector valve in the field of firefighting equipment technology. The selector valve comprises a valve body, a valve core, and a valve cover. A cavity is defined between the valve cover and the valve core. A connecting rod is located at the top of the valve core, extending through the valve cover. A pressure arm is provided on the valve cover, pressing against the end of the connecting rod. The pressure arm is controlled by a handle to switch between tightening and releasing the connecting rod. Seal rings are located between the connecting rod and the valve cover, and between the valve core and the valve cover, sealing the cavity.

[0003] The above technical solution has the following disadvantages: Its structure uses a pressure-arm activation mechanism, resulting in high activation force and relying on external high-pressure gas to open the selector valve. This selector valve requires an additional priming bottle (typically nitrogen). Once the nitrogen opens the selector valve, it must be connected to the fire extinguisher cylinder via copper tubing to activate the set. This cumbersome copper tubing connection on-site makes it difficult to clearly identify the set of activated fire extinguisher cylinders in the protected area, and the numerous connection points increase the risk of failure. The nitrogen priming bottle also increases ongoing maintenance costs. Summary of the Invention

[0004] The object of the present invention is to provide a gas fire extinguishing system selection valve to solve the above problems, which can use a gas circuit control structure with lower power and does not require a separate nitrogen cylinder group.

[0005] To achieve the above-mentioned objectives, the present invention discloses a selection valve for a gas fire extinguishing system, which includes a valve body and a movable tube body. The movable tube body has a piston ring on the outside, and the valve body has a piston ring cavity adapted to the piston ring on the inside. One end of the movable tube body is connected to the valve body input end, and a blocking plate capable of blocking the other end of the movable tube body is installed in the valve body. A movable tube body reset spring is arranged between the movable tube body and the valve body. When the other end of the movable tube body is separated from the blocking plate, the other end of the movable tube body is connected to the valve body output end. The valve body has a first control air path connected to the valve body input end and a sixth control air path connected to the side of the piston ring cavity away from the valve body input end. An air path control structure is connected between the first control air path and the sixth control air path.

[0006] When it does not need to be opened, the movable tube body is located on the side close to the output end of the valve body, the movable tube body is in contact with the blocking plate, and the blocking plate blocks the movable tube body. At this time, gas cannot pass through the movable tube body.

[0007] When it needs to be opened, the air circuit control structure is started, the first control air circuit is connected to the sixth control air circuit, and the gas enters the piston ring cavity away from the valve body input end through the first control air circuit and the sixth control air circuit, pushing the piston ring and the movable tube body to move toward the valve body input end, and the movable tube body is separated from the blockage of the blocking plate. At this time, the gas can pass through the movable tube body.

[0008] Compared with the existing technology, the movement of the movable tube body is controlled by the pressure of the system gas itself, which requires less external power and can use a smaller power gas circuit control structure. There is no need to use a separate nitrogen cylinder group, which has a simpler structure, more convenient operation and lower cost.

[0009] Preferably, the air path control structure includes a block cavity connected to the first control air path, the block cavity is connected to the third control air cavity, the third control air cavity is connected to the sixth control air path, a block capable of blocking the third control air cavity is movably placed in the block cavity, a block return spring is provided between the block and the block cavity, the third control air cavity is connected to a push rod movable cavity, the push rod movable cavity is movably connected to a push rod capable of contacting the block and separating the block from the third control air cavity, and the push rod is connected to a driving device for driving its movement.

[0010] When it is not needed to be opened, the block blocks the third control air cavity under the action of the block return spring, and the gas cannot enter the sixth control air path through the third control air cavity. The movable tube body is located on the side close to the output end of the valve body, and the movable tube body is in contact with the blocking plate. The blocking plate blocks the movable tube body. At this time, the gas cannot pass through the movable tube body.

[0011] When it needs to be opened, the driving device is started to drive the push rod forward to push open the block, and the gas enters the piston ring cavity away from the side of the valve body input end through the third control air cavity and the sixth control air path, pushing the piston ring and the movable tube body toward the valve body input end, and the movable tube body is separated from the blockage of the blocking plate. At this time, the gas can pass through the movable tube body.

[0012] Compared with the existing technology, the driving device only needs to overcome the pressure of the block return spring to push the block open, and then use the pressure of the system gas itself to control the movement of the movable tube body. The required external power is smaller, and a smaller power gas circuit control structure can be used. There is no need to use a separate nitrogen cylinder group. The structure is simpler, the operation is more convenient, and the cost is lower.

[0013] Preferably, the air circuit control structure includes a control air circuit housing, a block return spring accommodating chamber for accommodating a block return spring is provided at the bottom inner side of the control air circuit housing, a third control air circuit connected to the first control air circuit is provided at the bottom of the block return spring accommodating chamber, a control air circuit core is installed on the inner side of the control air circuit housing, the block cavity and the third control air cavity are located on the control air circuit core, and the block cavity and the block return spring accommodating chamber are arranged opposite to each other.

[0014] By arranging the separate structure of the control gas path housing and the control gas path core, the processing of each structure is facilitated and the production cost is low.

[0015] Preferably, a fourth control air circuit communicating with the third control air cavity is provided on the control air circuit core, and a fifth control air circuit communicating with the fourth control air circuit and the sixth control air circuit is provided on the control air circuit housing.

[0016] When in use, the gas is connected through the third control gas cavity, the fourth control gas path, the fifth control gas path and the sixth control gas path, which facilitates the processing of each structure and reduces the production cost.

[0017] Preferably, a fourth control air cavity for connecting the fourth control air circuit and the fifth control air circuit is opened inside the control air circuit housing.

[0018] The provision of the fourth control air cavity facilitates the connection between the fourth control air path and the fifth control air path, reduces the requirements on machining accuracy, and reduces production costs.

[0019] Preferably, a control air circuit end cover is installed on the control air circuit housing, an end cover sealing ring is placed between the control air circuit housing and the control air circuit end cover, a push rod sealing ring is placed between the push rod and the side wall of the push rod movable cavity, a block sealing ring is placed between the block and the opening of the third control air cavity, and a core sealing ring is placed between the control air circuit core and the control air circuit housing.

[0020] The end cap seal is used to seal between the control air circuit housing and the control air circuit end cap. The push rod seal is used to seal between the push rod and the side wall of the push rod active cavity. The block seal is used to seal between the block and the opening of the third control air cavity. The core seal is used to seal between the control air circuit core and the control air circuit housing. This structure is simple and has good sealing effect.

[0021] Preferably, the end portion of the blocking block is smaller than the third control air cavity and extends into the third control air cavity.

[0022] When in use, the end of the block is located inside the third control air cavity, which makes it convenient for the ejector rod to control the block and facilitates the passage of gas.

[0023] Preferably, the valve body includes an intermediate tube body, an input tube body is installed at the input end of the intermediate tube body, a limit ring is installed inside the intermediate tube body, and the gap between the input tube body and the limit ring constitutes a piston ring cavity.

[0024] The gap between the input pipe body and the limiting ring forms a piston ring cavity. This structure is convenient for manufacturing and processing, and is conducive to reducing production costs.

[0025] Preferably, the first control air circuit is located on the side of the input tube body, a first control air cavity connected to the first control air circuit is opened on the inside of the intermediate tube body, the first control air cavity is connected to the second control air circuit, a second control air cavity connected to the second control air circuit is opened on the outside of the intermediate tube body, the second control air cavity is connected to the input end of the air circuit control structure, the sixth control air circuit is located on the side of the intermediate tube body, a fifth control air cavity connected to the sixth control air circuit is also opened on the outside of the intermediate tube body, the fifth control air cavity is connected to the output end of the air circuit control structure.

[0026] The valve body adopts a split structure, which facilitates the processing of the first control air path, the first control air cavity, the second control air path, etc., and is conducive to further reducing production costs.

[0027] Preferably, the output tube body is installed at the output end of the intermediate tube body, the blocking plate is located at one end of the output tube body close to the movable tube body, and a through hole is opened on the side of the output tube body.

[0028] The valve body adopts a split structure, which facilitates the processing and installation of the sealing plate and helps to further reduce production costs.

[0029] In summary, the beneficial effects of the present invention are: compared with the existing technology, the movement of the movable tube body is controlled by utilizing the pressure of the system gas itself, the external power required is smaller, a smaller power gas circuit control structure can be used, and there is no need to use a separate nitrogen cylinder group. The structure is simpler, the operation is more convenient, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a selector valve for a gas fire extinguishing system according to the present invention; Figure 2 This is a schematic structural diagram of a control gas circuit housing, a control gas circuit core, and a control gas circuit end cover in a selector valve for a gas fire extinguishing system according to the present invention; Figure 3 This is a schematic structural diagram of a control gas circuit housing, a control gas circuit core, and a control gas circuit end cover in a gas fire extinguishing system selector valve of the present invention in an exploded state; Figure 4 It is a structural schematic diagram of a gas fire extinguishing system selection valve in an open state according to the present invention.

[0031] Figure: 1, intermediate tube; 2, input tube; 3, output tube; 4, limiting ring; 5, movable tube; 6, piston ring; 7, piston ring cavity; 8, blocking plate; 9, through hole; 10, control air circuit housing; 11, first control air circuit; 12, first control air cavity; 13, second control air circuit; 14, second control air cavity; 15, third control air circuit; 16, block return spring accommodating cavity; 17, block return spring; 18, core seal Sealing ring; 19. Blocking block cavity; 20. Blocking block; 21. Blocking block sealing ring; 22. Third control air cavity; 23. Push rod movable cavity; 24. Push rod; 25. Push rod sealing ring; 26. Fourth control air path; 27. Fourth control air cavity; 28. Fifth control air path; 29. Control air path core; 30. Control air path end cover; 31. End cover sealing ring; 32. Fifth control air cavity; 33. Sixth control air path; 34. Movable tube body reset spring. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] like Figure 1As shown, a gas fire extinguishing system selection valve includes a valve body and a movable tube body 5. The outer side of the movable tube body 5 has a piston ring 6, and the inner side of the valve body has a piston ring cavity 7 adapted to the piston ring 6. One end of the movable tube body 5 is connected to the input end of the valve body. A sealing plate 8 capable of blocking the other end of the movable tube body 5 is installed in the valve body. A movable tube body reset spring 34 is provided between the movable tube body 5 and the valve body. When the other end of the movable tube body 5 is separated from the sealing plate 8, the other end of the movable tube body 5 is connected to the output end of the valve body. The valve body has a first control air circuit 11 connected to the input end of the valve body and a sixth control air circuit 33 connected to the side of the piston ring cavity 7 away from the input end of the valve body. An air circuit control structure is connected between the first control air circuit 11 and the sixth control air circuit 33. When it is not necessary to open, the movable tube body 5 is located on the side close to the output end of the valve body, and the movable tube body 5 contacts the sealing plate 8. The sealing plate 8 blocks the movable tube body 5. At this time, the gas cannot pass through the movable tube body 5. When it is necessary to open, as Figure 4 As shown, the air circuit control structure is activated, connecting the first control air circuit 11 with the sixth control air circuit 33. Gas enters the piston ring cavity 7 on the side away from the valve body input end through the first and sixth control air circuits 11 and 33, pushing the piston ring 6 and movable tube 5 toward the valve body input end. The movable tube 5 is freed from the blockage of the blocking plate 8, allowing gas to pass through the movable tube 5. Compared to existing technologies, this system utilizes the system gas's own pressure to control the movement of the movable tube 5, requiring less external power and allowing the use of a less powerful air circuit control structure. This eliminates the need for a separate nitrogen cylinder set, resulting in a simpler structure, more convenient operation, and lower costs.

[0037] Specifically, if Figures 1 to 3As shown, the air path control structure includes a block cavity 19 connected to the first control air path 11, the block cavity 19 is connected to the third control air cavity 22, and the third control air cavity 22 is connected to the sixth control air path 33. A block 20 capable of blocking the third control air cavity 22 is movably placed in the block cavity 19. The size of the block 20 is smaller than that of the block cavity 19. A block return spring 17 is provided between the block 20 and the block cavity 19. The third control air cavity 22 is connected to a push rod movable cavity 23. A push rod 24 is movably connected in the push rod movable cavity 23, which can contact the block 20 and separate the block 20 from the third control air cavity 22. The push rod 24 is connected to a driving device that drives its movement. Specifically, the driving device can be an electric structure or a hydraulic structure. How to drive the push rod 24 to move adopts existing technology and will not be described in detail here. When opening is not required, the block 20 blocks the third control air chamber 22 under the action of the block return spring 17, and gas cannot enter the sixth control air path 33 through the third control air chamber 22. The movable tube body 5 is located on the side close to the valve body output end, and the movable tube body 5 contacts the blocking plate 8. The blocking plate 8 blocks the movable tube body 5. At this time, gas cannot pass through the movable tube body 5. When opening is required, the driving device is started, driving the push rod 24 forward, pushing the block 20 open, and gas enters the side of the piston ring cavity 7 away from the valve body input end through the third control air chamber 22 and the sixth control air path 33, pushing the piston ring 6 and the movable tube body 5 toward the valve body input end. The movable tube body 5 is freed from the blockage of the blocking plate 8, and gas can now pass through the movable tube body 5. Compared with the existing technology, the driving device only needs to overcome the pressure of the block return spring 17 to push the block 20 open, and then use the pressure of the system gas itself to control the movement of the movable tube body 5. The required external power is smaller, and a smaller power gas circuit control structure can be used. There is no need to use a separate nitrogen cylinder group. The structure is simpler, the operation is more convenient, and the cost is lower.

[0038] Specifically, the air circuit control structure includes a control air circuit housing 10. A block return spring accommodating chamber 16 for accommodating a block return spring 17 is defined at the bottom of the inner side of the control air circuit housing 10. A third control air circuit 15 connected to the first control air circuit 11 is defined at the bottom of the block return spring accommodating chamber 16. A control air circuit core 29 is mounted on the inner side of the control air circuit housing 10. The block cavity 19 and the third control air cavity 22 are located on the control air circuit core 29, and the block cavity 19 and the block return spring accommodating chamber 16 are positioned opposite each other. By providing a separate structure for the control air circuit housing 10 and the control air circuit core 29, the processing of each structure is facilitated, and production costs are reduced. A fourth control air circuit 26 connected to the third control air cavity 22 is defined on the control air circuit core 29. A fifth control air circuit 28 connected to the fourth control air circuit 26 and the sixth control air circuit 33 is defined on the control air circuit housing 10. During operation, gas flows through the third control air cavity 22, the fourth control air path 26, the fifth control air path 28, and the sixth control air path 33, facilitating the processing of various components and reducing production costs. A fourth control air cavity 27 is defined within the control air path housing 10 to connect the fourth control air path 26 and the fifth control air path 28. The provision of the fourth control air cavity 27 facilitates the connection between the fourth and fifth control air paths 26, 28, reduces the requirements for processing precision, and reduces production costs.

[0039] A control air circuit end cap 30 is mounted on the control air circuit housing 10. An end cap seal 31 is placed between the control air circuit housing 10 and the end cap 30. A push rod seal 25 is placed between the push rod 24 and the sidewall of the push rod active cavity 23. A block seal 21 is placed between the block 20 and the opening of the third control air cavity 22. A core seal 18 is placed between the control air circuit core 29 and the control air circuit housing 10. The end cap seal 31 is used to seal between the control air circuit housing 10 and the end cap 30. The push rod seal 25 is used to seal between the push rod 24 and the sidewall of the push rod active cavity 23. The block seal 21 is used to seal between the block 20 and the opening of the third control air cavity 22. The core seal 18 is used to seal between the control air circuit core 29 and the control air circuit housing 10. This structure is simple and provides excellent sealing effect. The end of the block 20 is smaller than the size of the third control air cavity 22 and extends into the third control air cavity 22. When in use, the end of the blocking block 20 is located inside the third control air cavity 22, which makes it easier for the ejector rod 24 to control the blocking block 20 and facilitates the passage of gas.

[0040] Specifically, the valve body includes an intermediate tube body 1, with an input tube body 2 mounted on the input end thereof. A limit ring 4 is mounted inside the intermediate tube body 1, and the gap between the input tube body 2 and the limit ring 4 forms a piston ring chamber 7. This gap between the input tube body 2 and the limit ring 4 forms the piston ring chamber 7. This structure facilitates manufacturing and processing, helping to reduce production costs. A first control air path 11 is located on the side of the input tube body 2. A first control air cavity 12 is defined inside the intermediate tube body 1 and communicates with the first control air path 11. The first control air cavity 12 is connected to a second control air path 13. A second control air cavity 14 is defined outside the intermediate tube body 1 and communicates with the second control air path 13. The second control air cavity 14 is connected to the input end of the air path control structure. A sixth control air path 33 is located on the side of the intermediate tube body 1. A fifth control air cavity 32 is defined outside the intermediate tube body 1 and communicates with the sixth control air path 33. The fifth control air cavity 32 is connected to the output end of the air path control structure. The valve body adopts a split structure, facilitating the processing of the first control air path 11, the first control air cavity 12, and the second control air path 13, further reducing production costs. The output end of the intermediate tube 1 is mounted with the output tube 3. A blocking plate 8 is located at the end of the output tube 3 near the movable tube 5. A through hole 9 is formed in the side of the output tube 3. The split structure of the valve body facilitates the processing and installation of the blocking plate 8, further reducing production costs.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A gas fire extinguishing system selector valve, comprising a valve body, characterized in that: The invention also includes a movable tube body (5), the outer side of the movable tube body (5) has a piston ring (6), the inner side of the valve body has a piston ring cavity (7) adapted to the piston ring (6), one end of the movable tube body (5) is connected to the valve body input end, a blocking plate (8) capable of blocking the other end of the movable tube body (5) is installed in the valve body, a movable tube body reset spring (34) is provided between the movable tube body (5) and the valve body, when the other end of the movable tube body (5) is separated from the blocking plate (8), the other end of the movable tube body (5) is connected to the valve body output end, the valve body has a first control air path (11) connected to the valve body input end and a sixth control air path (33) connected to the side of the piston ring cavity (7) away from the valve body input end, and an air path control structure is connected between the first control air path (11) and the sixth control air path (33).

2. The gas fire extinguishing system selector valve according to claim 1, characterized in that: The air path control structure includes a block cavity (19) connected to the first control air path (11), the block cavity (19) is connected to the third control air cavity (22), the third control air cavity (22) is connected to the sixth control air path (33), a block (20) capable of blocking the third control air cavity (22) is movably placed in the block cavity (19), a block return spring (17) is provided between the block (20) and the block cavity (19), the third control air cavity (22) is connected to a push rod movable cavity (23), a push rod (24) is movably connected in the push rod movable cavity (23) to be able to contact the block (20) and make the block (20) separate from the third control air cavity (22), and the push rod (24) is connected to a driving device for driving its movement.

3. The gas fire extinguishing system selector valve according to claim 2, characterized in that: The air circuit control structure includes an air circuit control housing (10), a block return spring accommodating chamber (16) for accommodating a block return spring (17) is provided at the bottom of the inner side of the air circuit control housing (10), a third air circuit (15) connected to the first air circuit (11) is provided at the bottom of the block return spring accommodating chamber (16), a control air circuit core (29) is installed on the inner side of the air circuit control housing (10), the block cavity (19) and the third control air cavity (22) are located on the control air circuit core (29), and the block cavity (19) and the block return spring accommodating chamber (16) are arranged opposite to each other.

4. The gas fire extinguishing system selector valve according to claim 3, characterized in that: A fourth control air path (26) communicating with the third control air cavity (22) is provided on the control air path core (29), and a fifth control air path (28) communicating with the fourth control air path (26) and the sixth control air path (33) is provided on the control air path housing (10).

5. The gas fire extinguishing system selector valve according to claim 4, characterized in that: A fourth control air cavity (27) for connecting the fourth control air path (26) and the fifth control air path (28) is provided on the inner side of the control air path housing (10).

6. The gas fire extinguishing system selector valve according to claim 3, characterized in that: A control air circuit end cover (30) is installed on the control air circuit housing (10), an end cover sealing ring (31) is placed between the control air circuit housing (10) and the control air circuit end cover (30), a push rod sealing ring (25) is placed between the push rod (24) and the side wall of the push rod movable cavity (23), a block sealing ring (21) is placed between the block (20) and the opening of the third control air cavity (22), and a core sealing ring (18) is placed between the control air circuit core (29) and the control air circuit housing (10).

7. The gas fire extinguishing system selector valve according to claim 2, characterized in that: The end of the blocking block (20) is smaller than the third control air cavity (22) and extends into the third control air cavity (22).

8. The gas fire extinguishing system selector valve according to any one of claims 1 to 7, characterized in that: The valve body comprises an intermediate tube body (1), an input tube body (2) is installed at the input end of the intermediate tube body (1), a limiting ring (4) is installed inside the intermediate tube body (1), and a gap between the input tube body (2) and the limiting ring (4) constitutes a piston ring cavity (7).

9. The gas fire extinguishing system selector valve according to claim 8, characterized in that: The first control air path (11) is located at the side of the input tube body (2); a first control air cavity (12) connected to the first control air path (11) is opened on the inner side of the intermediate tube body (1); the first control air cavity (12) is connected to the second control air path (13); a second control air cavity (14) connected to the second control air path (13) is opened on the outer side of the intermediate tube body (1); the second control air cavity (14) is connected to the input end of the air path control structure; a sixth control air path (33) is located at the side of the intermediate tube body (1); a fifth control air cavity (32) connected to the sixth control air path (33) is further opened on the outer side of the intermediate tube body (1); the fifth control air cavity (32) is connected to the output end of the air path control structure.

10. The gas fire extinguishing system selector valve according to claim 8, characterized in that: The output end of the intermediate tube body (1) is equipped with an output tube body (3), a blocking plate (8) is located at one end of the output tube body (3) close to the movable tube body (5), and a through hole (9) is provided on the side of the output tube body (3).

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