Bottle valve with self-tuning and pressure-reducing functions

Abstract

The invention discloses a bottle head valve with a self-tuning pressure reduction function, which comprises a valve body, an air inlet channel, an air outlet channel, a main cavity and a valve rod arranged in the valve body in a sliding fit manner are formed on the valve body, one end of the valve rod is positioned in the main cavity and is connected with a main piston arranged in the main cavity in a sliding fit manner, and the bottle head valve also comprises an end cover covering the end part of the valve body, the gas taking assembly is used for extracting the high-pressure medium from the gas inlet channel and conveying the high-pressure medium to the upper end of the main cavity; the gas taking assembly at least comprises a gas taking channel and a gas supply channel which are communicated with each other, the other end of the gas taking channel is communicated with the gas inlet channel, the other end of the gas supply channel is communicated with the upper end of the main cavity, and a first valve element and a second valve element which are opposite in closing direction are arranged in the gas taking channel in series at intervals. The first valve element is opened by force applied by the starting ejector rod so that the air inlet channel can communicate with the air supply channel. After the first valve element is opened, when the pressure in the gas taking channel is lower than or equal to the pressure in the gas supply channel, the second valve element is closed so that the current pressure in the main cavity can be kept.

Description

Technical Field

[0001] This application relates to the field of fire protection equipment technology, specifically to a bottle head valve with self-tuning pressure reduction function. Background Technology

[0002] Bottle valves (also called container valves) are typically used to connect to high-pressure containers containing extinguishing agents. When in use, the valve is opened by a driving gas. The extinguishing agent is depressurized and stabilized through the valve before being released into the protected area via pipelines and nozzles. In existing container valve technology, opening typically involves introducing high-pressure gas into the cavity through a gas pipe interface on the pressure cap, pushing a piston and displacing the valve stem to open the valve. Since the external gas source directly drives the piston, it is necessary to overcome the spring force and the thrust of the extinguishing agent inside the high-pressure container on the valve stem to open the valve. Therefore, high-pressure gas must be used as the driving gas source, resulting in high requirements for the gas cylinders storing the opening gas, the gas delivery pipelines, and the control system, leading to high costs. Furthermore, the driving gas source cannot be interrupted during valve opening; otherwise, the valve may automatically close, interrupting firefighting operations. Further research and development are necessary. Summary of the Invention

[0003] The purpose of this application is to provide a bottle head valve with a self-tuning pressure reducing function to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: a bottle head valve with self-tuning pressure reduction function, comprising a valve body 1, wherein the valve body 1 has an inlet channel 2, an outlet channel 3, an open main cavity 16, and a valve stem 4 slidably disposed within the valve body 1 for connecting or disconnecting the inlet channel 2 and the outlet channel 3, one end of the valve stem 4 being located within the main cavity 16 and connected to a main piston 5 slidably disposed within the main cavity 16; further comprising an end cap 6 covering the end of the valve body 1 for closing the open end of the main cavity 16; and further comprising a gas extraction assembly 8 for extracting high-pressure medium from the inlet channel 2 and conveying it to the upper end of the main cavity 16, thereby pushing the main piston 5 and the valve stem 4 to move to connect the inlet channel 2 and the outlet channel 3; the gas extraction assembly 8 includes at least an air intake channel 801 and an air supply channel 804 that are interconnected. The other end of the air intake channel 801 is connected to the air intake channel 2, and the other end of the air supply channel 804 is connected to the upper end of the main cavity 16. A first valve core 805 and a second valve core 806 with opposite closing directions are arranged in series in the air intake channel 801. The first valve core 805 is opened by the actuating push rod 11 to connect the air intake channel 2 and the air supply channel 804. After the first valve core 805 is opened, when the pressure in the air intake channel 801 is lower than or equal to the pressure in the air supply channel 804, the second valve core 806 is closed to maintain the current pressure in the main cavity 16, so as to maintain the valve stem 4 continuously connecting the air intake channel 2 and the air outlet channel 3.

[0005] Furthermore, the air intake assembly 8 also includes a sleeve 807. The air intake channel 801 has a receiving cavity 8011 formed within it to accommodate the sleeve 807. The sleeve 807 has a first sliding cavity 8071 and a second sliding cavity 8074 formed by axial inward concavity at both ends, and a connecting hole 8072 axially connecting the first sliding cavity 8071 and the second sliding cavity 8074. The opening of the first sliding cavity 8071 faces the air intake channel 2. The inner diameter of the connecting hole 8072 is smaller than that of the first sliding cavity 8071 and the second sliding cavity 8074, so that valve seats are formed at the bottom of the first sliding cavity 8071 and the second sliding cavity 8074, respectively. A radially opening is provided on the sleeve 807 for the actuating push rod 11 to penetrate into the connecting hole. The through hole 8072 has a second transverse hole 8073; the first valve core 805 and the second valve core 806 are respectively slidably fitted in the first sliding cavity 8071 and the second sliding cavity 8074; the first valve core 805 and the second valve core 806 each include a sliding part 811 and a front guide shaft 810 that are integrated together, the sliding part 811 is movably fitted with the first sliding cavity 8071 or the second sliding cavity 8074; there is a sealing part between the sliding part 811 and the front guide shaft 810 that cooperates with the valve seat; the front guide shaft 810 is movably inserted into the through hole 8072, and the front end of the front guide shaft 810 of the first valve core 805 is exposed in the second transverse hole 8073, and the front guide shaft 810 of the second valve core 806 is away from the second transverse hole 8073.

[0006] Furthermore, the bottle head valve with self-tuning pressure reduction function also includes an actuator 7. The actuator 7 includes at least a housing 701 connected to the valve body 1, an actuator slidably disposed in the housing 701 and connected to the actuating rod 11, which causes the actuating rod 11 to enter or exit the second transverse hole 8073. The movement trajectory of the actuating rod 11 intersects with the movement trajectory of the first valve core 805. When the actuating rod 11 enters the connecting hole 8072, it is used to open the first valve core 805.

[0007] Furthermore, a push rod 12 is slidably mounted on the housing 701. The axis of the push rod 12 is parallel to the axis of the actuator. One end of the push rod 12 located inside the housing 701 is connected to the actuator. The other end of the push rod 12 protruding outside the housing 701 is provided with a handle. The push rod 12 is used to generate thrust to make the actuator push the starter rod 11 toward the first valve core 805.

[0008] Furthermore, the starter 7 is a pneumatic starter, the actuator is a starter piston 703, and the housing 701 is provided with an air inlet 702 for inputting compressed gas to generate thrust so that the starter piston 703 pushes the starter rod 11 toward the first valve core 805.

[0009] Furthermore, the starter 7 is an electric starter, the actuator is an iron core 705, and a coil 706 is provided inside the housing 701 to generate electromagnetic thrust so that the iron core 705 pushes the starter rod 11 toward the first valve core 805.

[0010] Furthermore, a second return spring 704 is also installed inside the housing 701. The force of the second return spring 704 is directed to move the actuator away from the first valve core 805, so that the starting push rod 11 exits the communicating hole 8072 after the thrust is eliminated, thereby closing the first valve core 805.

[0011] Furthermore, a hollow threaded sleeve 809 is screwed onto the port of the first sliding cavity 8071, and a third return spring 808 is installed inside the first sliding cavity 8071. Both ends of the spring abut against the threaded sleeve 809 and the sliding part 811 end face of the first valve core 805, respectively, to keep the first valve core 805 in a closed state.

[0012] Furthermore, the end cap 6 has an annular groove 802 with an opening on its end face facing the main cavity 16. The opening of the annular groove 802 at any circumferential position of the end cap 6 is connected to the port of the second sliding cavity 8074. The air supply channel 804 is opened on the end cap 6 and faces the main cavity 16. A relay channel 803 is provided between the annular groove 802 and the air supply channel 804 for communication.

[0013] Furthermore, the end cap 6 has an exhaust chamber 601 that opens into the main cavity 16 and an exhaust hole 603 that communicates with the bottom of the exhaust chamber 601 and extends out of the outer end face of the end cap 6. The third valve core 10 is movably mounted in the exhaust chamber 601. A retaining ring groove 602 is provided on the inner wall of one end of the exhaust chamber 601 facing the main cavity 16 for mounting a retaining ring 17. The retaining ring 17 is used to allow the third valve core 10 to have a set stroke in the exhaust chamber 601. When the thrust generated by the medium discharged through the exhaust chamber 601 and the exhaust hole 603 is greater than the weight of the third valve core 10, the third valve core 10 blocks the exhaust hole 603.

[0014] The beneficial technical effects of this application are as follows: The self-tuning pressure-reducing cylinder valve provided in this application, by setting up an air intake component, extracts high-pressure medium from the air inlet channel and delivers it to the upper end of the main cavity, thereby pushing the main piston and valve stem to move and connect the air inlet channel and the air outlet channel, thus realizing the opening action of the cylinder valve. In other words, the air intake component realizes the continuous opening of the cylinder valve by utilizing the high-pressure fire-fighting medium in the cylinder connected to the cylinder valve itself, thereby avoiding the use of an additional high-pressure air source to open the cylinder valve, significantly reducing the pressure requirements of the driving air source, and having the advantages of good safety performance, effectively reducing the requirements of related driving air source components, and cost reduction and efficiency improvement; at the same time, through the locking function of the second valve core, on the one hand, the cylinder valve can be opened After opening, it can achieve self-locking to maintain a stable and continuous opening, thereby ensuring the continuous output of fire-fighting medium. On the other hand, since the pressure of the medium entering the main cavity is the initial pressure in the air inlet channel (that is, the initial pressure in the cylinder), after the cylinder head valve is initially opened, the pressure in the air inlet channel gradually decreases with the output of fire-fighting medium, while the pressure in the main cavity remains unchanged. Therefore, it will push the valve stem down, causing the opening of the cylinder head valve to increase synchronously, thereby stabilizing the output pressure of the air outlet channel. Therefore, it also has the advantage of good pressure reduction and stabilization effect. Thirdly, after the cylinder head valve is opened, even after the external force driving the first valve core to open disappears, the cylinder head valve can still maintain the open state and stably output fire-fighting medium, which has the advantage of good reliability. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the bottle head valve with self-tuning pressure reduction function of this application; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 for Figure 1 Enlarged view of a section at point B in the middle; Figure 4 This is a schematic diagram of another example of the starter structure of the bottle head valve with self-tuning pressure reduction function of this application; Figure 5 This is a schematic diagram of the first and second valve cores of the bottle head valve with self-tuning pressure reduction function of this application. Figure 6 This is a perspective view of the bottle head valve with self-tuning pressure reduction function according to this application.

[0016] In the diagram: 1. Valve body; 2. Inlet channel; 3. Outlet channel; 4. Valve stem; 5. Main piston; 6. End cap; 7. Starter; 701. Housing; 702. Air inlet; 703. Starting piston; 704. Second return spring; 705. Iron core; 706. Coil; 8. Air intake assembly; 801. Air intake channel; 8011. Receiving cavity; 802. Annular groove; 803. Relay channel; 804. Air supply channel; 805. First valve core; 8051. Passive surface; 806. Second valve core; 807. Sleeve; 8071. First sliding cavity; 8072. 8073. Connecting hole; 8074. Second transverse hole; 8075. Second sliding cavity; 808. Third return spring; 809. Screw sleeve; 810. Front guide shaft; 811. Sliding part; 812. Notch; 813. Flow passage; 9. First return spring; 10. Third valve core; 11. Starting push rod; 1101. First rod part; 1102. Second rod part; 1103. Driving surface; 12. Push rod; 13. First transverse hole; 14. Boss; 15. Sealing ring; 16. Main cavity; 17. Retaining ring; 601. Exhaust cavity; 602. Retaining ring groove; 603. Exhaust hole. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Please see Figures 1 to 6A bottle head valve with self-tuning pressure reduction function includes a valve body 1, on which an air inlet channel 2, an air outlet channel 3, an open main cavity 16 are formed, and a valve stem 4 is slidably disposed within the valve body 1 to connect or disconnect the air inlet channel 2 and the air outlet channel 3 (i.e., to open or close the bottle head valve). One end of the valve stem 4 is located within the main cavity 16 and is connected to a main piston 5 slidably disposed within the main cavity 16. The valve body 1 also includes an end cap 6 covering the end of the valve body 1 to close the open portion of the main cavity 16, and an air intake assembly 8 for extracting high-pressure medium from the air inlet channel 2 and conveying it to the upper end of the main cavity 16, thereby pushing the main piston 5 and the valve stem 4 to move and connect the air inlet channel 2 and the air outlet channel 3. The air intake assembly 8 includes at least interconnected air intake components. The gas intake channel 801 and the gas supply channel 804 are connected at one end to the intake channel 2, and at the other end to the upper end of the main cavity 16. A first valve core 805 and a second valve core 806 with opposite closing directions are connected in series within the intake channel 801. Both valve cores are normally closed. The first valve core 805 is opened by the actuating rod 11 to connect the intake channel 2 and the gas supply channel 804. After the first valve core 805 is opened, the high-pressure medium flowing through it causes the second valve core 806 to open towards the gas supply channel 2. As the high-pressure medium is continuously injected into the main cavity 16, the main piston 5 moves downward, pushing the valve rod 4 forward to open the cylinder valve. The high-pressure medium inside the cylinder, acting as the extinguishing agent, then flows out. The medium is output through the inlet channel 2 and the outlet channel 3, causing the pressure in the inlet channel 2 and the intake channel 801 to continuously decrease. When the pressure in the intake channel 801 is lower than or equal to the pressure in the supply channel 804, the second valve core 806 descends and closes under its own weight and the pressure of the medium in the supply channel 804, so that the current pressure in the main cavity 16 is maintained, thus keeping the valve stem 4 continuously connected to the inlet channel 2 and the outlet channel 3. In this embodiment, the cross-sectional area of ​​the main piston 5 is larger than the cross-sectional area of ​​the sealing structure on the stem valve 4 used to disconnect the inlet channel 2 and the outlet channel 3. Thus, when the high-pressure medium in the inlet channel 2 is introduced into the main cavity 16 through the intake assembly 8, the pressure on the main piston 5 pushes the valve stem 4 downward. The thrust (opening force of the cylinder head valve) is greater than the sum of the upward thrust of the high-pressure medium in the inlet channel 2 on the valve stem 4 and the elastic force generated by the first return spring 9 (closing force of the cylinder head valve). Here, it can be understood that the first return spring 9 is installed at the lower end of the main cavity 16 and is used to make the valve stem 4 rise after the pressure in the main cavity 16 is eliminated, thereby disconnecting the inlet channel 2 and the outlet channel 3, that is, closing the cylinder head valve. When the cylinder connected to the cylinder head valve is filled with high-pressure fire extinguishing medium, the upward thrust it generates on the valve stem 4 and the elastic force of the first return spring 9 are superimposed to complete the stable closing of the cylinder head valve. The first return spring 9, the valve stem 4, and the sealing structure of the valve stem 4 for disconnecting the inlet channel 2 and the outlet channel 3 can adopt existing technology.

[0019] According to the structure provided in this embodiment, the self-tuning pressure-reducing cylinder valve provided in this application, by setting an air intake component, can extract high-pressure medium from the cylinder through the air intake channel 2 and transport it to the upper end of the main cavity 16 after the cylinder valve is installed on the cylinder, thereby pushing the main piston 5 and valve stem 4 to move to connect the air intake channel 2 and the air outlet channel 3, thus realizing the opening action of the cylinder valve. In other words, the air intake component 8 realizes the continuous opening of the cylinder valve by utilizing the high-pressure fire-fighting medium in the cylinder connected to the cylinder valve itself, thereby avoiding the use of an additional high-pressure air source to open the cylinder valve, significantly reducing the pressure requirements of the driving air source, and having the advantages of good safety performance, effectively reducing the requirements of related driving air source supporting components, and cost reduction and efficiency improvement; at the same time, through the locking function of the second valve core 806, one side Firstly, the cylinder head valve can self-lock after opening to maintain a stable and continuous opening, thereby ensuring the continuous output of fire-fighting media. Secondly, since the pressure of the medium entering the main cavity 16 is the initial pressure in the air inlet channel 2 (that is, the initial pressure in the cylinder), after the cylinder head valve is initially opened, the pressure in the air inlet channel 2 gradually decreases as the fire-fighting media is output, while the pressure in the main cavity 16 remains unchanged. Therefore, it will push the valve stem 4 downward, causing the opening of the cylinder head valve to increase synchronously, reducing the throttling effect, and thus stabilizing the output pressure of the air outlet channel 3. Therefore, it also has the advantage of good pressure reduction and stabilization effect. Thirdly, after the cylinder head valve is opened, even after the external force driving the first valve core 805 to open disappears, the cylinder head valve can still maintain the open state and stably output the fire-fighting media, which has the advantage of good reliability.

[0020] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The air intake assembly 8 also includes a sleeve 807. A receiving cavity 8011 for accommodating the sleeve 807 is formed within the air intake channel 801. In this embodiment, the receiving cavity 8011 also has an opening and is located on the same side of the valve body 1 as the opening of the main cavity 16 to facilitate the loading and unloading of the sleeve 807. The end cap 6 can axially limit the sleeve 807 while closing the opening of the main cavity 16. The sleeve 807 has a first sliding cavity 8071 and a second sliding cavity 8074 formed by axial indentation at both ends, and a connecting hole 8072 axially connecting the first sliding cavity 8071 and the second sliding cavity 8074. The opening of the first sliding cavity 8071 faces the air intake channel 2. The inner diameter of the connecting hole 8072 is smaller than that of the first sliding cavity 8071 and the second sliding cavity 8074, respectively, to facilitate loading and unloading of the sleeve 8077. A valve seat is formed at the bottom of the two sliding cavities 8074; a second transverse hole 8073 is radially provided on the sleeve 807 for the starting push rod 11 to enter the connecting hole 8072; the first valve core 805 and the second valve core 806 are respectively slidably fitted in the first sliding cavity 8071 and the second sliding cavity 8074; the first valve core 805 and the second valve core 806 each include a sliding part 811 and a front guide shaft 810 that are integrated together, the sliding part 811 is movably engaged with the first sliding cavity 8071 or the second sliding cavity 8074; there is a sealing part between the sliding part 811 and the front guide shaft 810 that engages with the valve seat; the front guide shaft 810 is movably inserted into the connecting hole 8072, and the front end of the front guide shaft 810 of the first valve core 805 is exposed in the second transverse hole 8073, while the front guide shaft 810 of the second valve core 806 is away from the second transverse hole 8073.

[0021] As a preferred embodiment, please refer to the following: Figures 1 to 6 The outer circumferential surface of the sliding part 811 has at least one longitudinally penetrating notch 812. This notch 812 forms a flow channel 813 with the inner wall of the first sliding cavity 8071 or the second sliding cavity 8074. The sealing part is fixedly fitted with a sealing ring 15 for sealing. Thus, when the sealing ring 15 moves away from the corresponding valve seat along with the first valve core 805 or the second valve core 806, the first valve core 805 or the second valve core 806 is in the open state, and the high-pressure medium flows through the air inlet channel 2. The air intake channel 801, the flow passage 813 in the first sliding cavity 8071, the connecting hole 8072, the flow passage 813 in the second sliding cavity 8074, and the air supply channel 804 reach the main cavity 16. When the sealing ring 15 abuts and seals with the valve seat, the first valve core 805 or the second valve core 806 is in the closed state, thereby realizing the connection and disconnection of the air intake channel 801 and the air supply channel 804, and thus realizing the controllable air intake of the air intake channel 2 to control the action of the main piston 5.

[0022] As a preferred embodiment, please refer to the following: Figures 1 to 6The starting rod 11 includes a first rod portion 1101 and a second rod portion 1102 coaxially arranged, wherein the diameter of the second rod portion 1102 is smaller than the diameter of the first rod portion 1101 and the diameter of the second transverse hole 8073. The first rod portion 1101 is sealed and slidably supported by the valve body 1. The front end of the second rod portion 1102 forms a driving surface 1103, which can be configured as a tapered surface, arc surface, or inclined surface that gradually tapers towards the end face of the second rod portion 1102. The corresponding end face of the front guide shaft 810 of the first valve core 805 is configured to be adapted to the driving surface 1103. The moving surface 8051, and the passive surface 8051 can also be set as a conical surface, an arc surface or an inclined surface. In this way, when the second rod part 1102 passes through the second transverse hole 8073 and enters the connecting hole 8072, the driving surface 1103 contacts the passive surface 8051, pushing the first valve core 805 forward so that its sealing part is away from the valve seat of the first sliding cavity 8071, realizing the opening action of the first valve core 805. Due to the above structure of the driving surface 1103, the opening force of the first valve core 805 can be effectively reduced, thus the force used to push the starting rod 11 can be effectively reduced.

[0023] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The self-tuning pressure-reducing bottle valve also includes an actuator 7. The actuator 7 includes at least a housing 701 connected to the valve body 1, an actuator slidably disposed in the housing 701 and connected to the starting rod 11, which causes the starting rod 11 to enter or exit the second transverse hole 8073. The movement trajectory of the starting rod 11 intersects with the movement trajectory of the first valve core 805. When the starting rod 11 enters the connecting hole 8072, it is used to open the first valve core 805. In this embodiment, a boss 14 is formed on the valve body 1. The boss 14 has a coaxial first transverse hole 13 and a threaded hole. The threaded hole is located at the outer end of the boss 14 and is used to screw into the external thread section of the housing 701, thereby threading the housing 701 and the valve body 1 together. The first transverse hole 13 and the second transverse hole 8073 are coaxial. The first rod portion 1101 slides with the first transverse hole 13. In this way, the actuator 7 can be set as a modular component, which is convenient for installation and use.

[0024] In another preferred embodiment, sealing rings 15 are also provided between the outer wall of the sleeve 807 and the inner wall of the receiving cavity 8011, as well as on the first rod portion 1101. The sealing rings 15 provided between the outer wall of the sleeve 807 and the inner wall of the receiving cavity 8011 can prevent leakage between the sleeve 807 and the receiving cavity 8011. The sealing rings 15 fitted on the first rod portion 1101 can seal the first rod portion 1101 when it moves in the first transverse hole 13, further improving the reliability of the bottle head valve provided in this application.

[0025] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6A push rod 12 is slidably mounted on the housing 701. The axis of the push rod 12 is parallel to the axis of the actuator. One end of the push rod 12 inside the housing 701 is connected to the actuator, and the other end of the push rod 12 outside the housing 701 is provided with a handle. The push rod 12 is used to generate thrust to make the actuator push the starting rod 11 toward the first valve core 805. In this way, in an emergency, the push rod 12 can be manually pushed to drive the actuator to move the starting rod 11 forward and open the first valve core 805. It has good safety redundancy. The handle is used to increase the contact area with the hand and make operation easier.

[0026] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The starter 7 is a pneumatic starter, and the actuator is the starter piston 703. The housing 701 is provided with an air inlet 702 for inputting compressed gas to generate thrust so that the starter piston 703 pushes the starter rod 11 toward the first valve core 805. On the one hand, the input of compressed gas can be controlled by a solenoid valve-like component to realize the remote opening of the bottle head valve and improve the intelligence level of the bottle head valve. On the other hand, since the first valve core 805 has a small diameter, the closing pressure generated by the high-pressure medium from the air inlet channel 2 is small, and the aforementioned inclined push force-increasing structure of the drive surface 1103 can open the first valve core 805 with a small force. At the same time, the housing 701 has a starter piston 703, whose diameter is larger than the diameter of the first valve core 805. In this way, a low-pressure drive air source can be used to open the bottle head valve, which completely solves the technical problems existing in the high-pressure drive air source in the background art.

[0027] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The starter 7 is an electric starter, and the actuator is an iron core 705. A coil 706 is installed in the housing 701 to generate electromagnetic thrust so that the iron core 705 pushes the starter rod 11 toward the first valve core 805. In this way, the coil 706 can be connected to the electrical signal of the fire control system to directly drive the opening of the bottle head valve, further simplifying the structure, realizing the remote opening of the bottle head valve, and improving the intelligence level of the bottle head valve.

[0028] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 The housing 701 is also equipped with a second reset spring 704. The force of the second reset spring 704 is directed to move the actuator away from the first valve core 805. This is used to make the starting rod 11 exit the connecting hole 8072 after the above-mentioned thrust is eliminated, so that the first valve core 805 is closed. In this way, the automatic reset function of each component is realized, malfunctions are avoided, and the reliability of the bottle head valve is further guaranteed during fire duty and fire fighting.

[0029] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6A hollow threaded sleeve 809 is screwed onto the port of the first sliding cavity 8071. A third return spring 808 is installed inside the first sliding cavity 8071, with its two ends abutting against the threaded sleeve 809 and the sliding part 811 end face of the first valve core 805, respectively. This is used to keep the first valve core 805 in a closed state, i.e., normally closed. This helps to prevent the high-pressure medium in the air intake channel 2 from leaking into the main cavity 16 and avoids the bottle head valve from opening accidentally. It is understood that the above structure can also be used on the second valve core 806 to ensure the normally closed sensitivity and normally closed effect of the second valve core 806 and avoid the bottle head valve from closing accidentally while it is open. This further ensures the reliability of the bottle head valve during fire duty and fire fighting.

[0030] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6 An annular groove 802 with an opening is formed on the end face of the end cap 6 facing the main cavity 16. The opening of the annular groove 802 at any circumferential position of the end cap 6 is connected to the port of the second sliding cavity 8074. The air supply channel 804 is opened on the end cap 6 and faces the main cavity 16. A relay channel 803 is provided between the annular groove 802 and the air supply channel 804 for connection. In this way, during installation, the high pressure medium output from the second sliding cavity 8074 can be introduced into the main cavity 16 simply by tightening the end cap 6 onto the valve body 1. This helps to reduce the processing difficulty of the end cap 6 and facilitates installation.

[0031] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 6The end cap 6 has an exhaust chamber 601 opening into the main cavity 16 and an exhaust hole 603 communicating with the bottom of the exhaust chamber 601 and extending out of the outer end face of the end cap 6. The third valve core 10 is movably mounted in the exhaust chamber 601. A retaining ring groove 602 is provided on the inner wall of the end of the exhaust chamber 601 facing the main cavity 16 for mounting a retaining ring 17. The retaining ring 17 is used to allow the third valve core 10 to have a set stroke in the exhaust chamber 601. When the medium discharged through the exhaust chamber 601 and the exhaust hole 603 generates When the thrust is greater than the weight of the third valve core 10, the third valve core 10 will block the exhaust port 603. In this embodiment, the third valve core 10 can adopt the same structure as the first valve core 805. In this way, there is also a flow passage 813 between the sliding part of the third valve core 10 and the exhaust chamber 601. During fire duty, the third valve core 10 drops due to its own weight, causing its sealing part to leave the bottom of the exhaust chamber 601, that is, the opening of the exhaust port 603 at the bottom of the exhaust chamber 601 is opened, thus achieving the normally open state. According to the structure provided in this embodiment, when the first valve core 805 leaks, the medium leaking into the main cavity 16 is discharged to the atmosphere through the third valve core 10, ensuring that the main cavity 16 is under low pressure, thereby ensuring that the cylinder head valve is reliably closed during fire duty. When the first valve core 805 opens, a large amount of high-pressure medium enters the main cavity 16. At this time, the flow rate of the medium discharged from the third valve core 10 increases instantaneously, causing the third valve core 10 to move upward, so that its sealing part contacts the bottom seal of the exhaust chamber 601, thereby blocking and keeping the exhaust hole 603 closed. In this way, the pressure in the main cavity 16 is maintained, thereby opening the cylinder head valve. When a fire-fighting operation is completed and the cylinder head valve needs to be reused, a rod-shaped tool is simply inserted into the exhaust hole to push the third valve core 10 against the retaining ring 17. After opening the third valve core 10 and reducing the pressure in the main cavity 16 to low pressure, the valve stem 4 can be reset under the action of the first return spring 9. The operation is simple, convenient, and reliable.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bottle head valve with self-tuning pressure reduction function, comprising a valve body (1), wherein an air inlet channel (2), an air outlet channel (3), an open main cavity (16) are formed on the valve body (1), and a valve stem (4) slidably disposed within the valve body (1) for connecting or disconnecting the air inlet channel (2) and the air outlet channel (3), one end of the valve stem (4) being located within the main cavity (16) and connected to a main piston (5) slidably disposed within the main cavity (16), and further comprising an end cap (6) covering the end of the valve body (1) for closing the openness of the main cavity (16), characterized in that: It also includes a gas intake assembly (8) for extracting high-pressure medium from the intake channel (2) and delivering it to the upper end of the main cavity (16) to push the main piston (5) and the valve stem (4) to move and connect the intake channel (2) and the outlet channel (3); the gas intake assembly (8) includes at least a gas intake channel (801) and a gas supply channel (804) that are interconnected, wherein the other end of the gas intake channel (801) is connected to the intake channel (2), and the other end of the gas supply channel (804) is connected to the upper end of the main cavity (16), and the gas intake channel (801) is spaced apart. The system includes a first valve core (805) and a second valve core (806) with opposite closing directions. The first valve core (805) is opened by the actuating push rod (11) to connect the air intake channel (2) and the air supply channel (804). After the first valve core (805) is opened, when the pressure in the air intake channel (801) is lower than or equal to the pressure in the air supply channel (804), the second valve core (806) is closed to maintain the current pressure in the main cavity (16) and to maintain the valve stem (4) continuously connecting the air intake channel (2) and the air outlet channel (3).

2. The bottle head valve with self-tuning pressure reduction function according to claim 1, characterized in that: The air intake assembly (8) further includes a sleeve (807). A receiving cavity (8011) for accommodating the sleeve (807) is formed within the air intake channel (801). The sleeve (807) has a first sliding cavity (8071) and a second sliding cavity (8074) formed by axial indentation at both ends, and a connecting hole (8072) axially connecting the first sliding cavity (8071) and the second sliding cavity (8074). The opening end of the first sliding cavity (8071) faces the air intake channel (2). The inner diameter of the connecting hole (8072) is smaller than that of the first sliding cavity (8071) and the second sliding cavity (8074) to form valve seats at the bottom of the first sliding cavity (8071) and the second sliding cavity (8074), respectively. A radially opening is provided on the sleeve (807) for the opening... The moving push rod (11) penetrates the second transverse hole (8073) of the connecting hole (8072); the first valve core (805) and the second valve core (806) are respectively slidably fitted in the first sliding cavity (8071) and the second sliding cavity (8074); the first valve core (805) and the second valve core (806) each include a sliding part (811) and a front guide shaft (810) that are connected as one piece, the sliding part (811) is movably fitted with the first sliding cavity (8071) or the second sliding cavity (8074); there is a sealing part between the sliding part (811) and the front guide shaft (810) that fits with the valve seat; the front guide shaft (810) is movably inserted into the connecting hole (8072), and the front end of the front guide shaft (810) of the first valve core (805) is exposed in the second transverse hole (8073).

3. The bottle head valve with self-tuning pressure reduction function according to claim 2, characterized in that: It also includes an actuator (7), which includes at least a housing (701) connected to the valve body (1), an actuator that is slidably disposed in the housing (701) and connected to the start rod (11) and causes the start rod (11) to enter or exit the second transverse hole (8073), the movement trajectory of the start rod (11) intersects with the movement trajectory of the first valve core (805), and is used to open the first valve core (805) when the start rod (11) enters the connecting hole (8072).

4. The bottle head valve with self-tuning pressure reduction function according to claim 3, characterized in that: A push rod (12) is slidably mounted on the housing (701). The axis of the push rod (12) is parallel to the axis of the actuator. One end of the push rod (12) located inside the housing (701) is connected to the actuator. The end of the push rod (12) protruding outside the housing (701) is provided with a handle. The push rod (12) is used to generate thrust to make the actuator push the starter rod (11) to move toward the first valve core (805).

5. The bottle head valve with self-tuning pressure reduction function according to claim 3, characterized in that: The starter (7) is a pneumatic starter, the actuator is a starter piston (703), and the housing (701) is provided with an air inlet (702) for inputting compressed gas to generate thrust so that the starter piston (703) pushes the starter rod (11) toward the first valve core (805).

6. The bottle head valve with self-tuning pressure reduction function according to claim 3, characterized in that: The starter (7) is an electric starter, the actuator is an iron core (705), and a coil (706) is provided in the housing (701) to generate electromagnetic thrust so that the iron core (705) pushes the starter rod (11) toward the first valve core (805).

7. The bottle head valve with self-tuning pressure reduction function according to any one of claims 4 to 6, characterized in that: The housing (701) is also equipped with a second return spring (704). The force of the second return spring (704) is directed to make the actuator move away from the first valve core (805), so that the starting rod (11) will exit the connecting hole (8072) after the thrust is eliminated, so that the first valve core (805) will be closed.

8. The bottle head valve with self-tuning pressure reduction function according to claim 2, characterized in that: A hollow threaded sleeve (809) is screwed onto the port of the first sliding cavity (8071). A third return spring (808) is installed inside the first sliding cavity (8071). Both ends of the spring abut against the end face of the threaded sleeve (809) and the sliding part (811) of the first valve core (805), respectively, to keep the first valve core (805) in a closed state.

9. The bottle head valve with self-tuning pressure reduction function according to claim 2, characterized in that: The end cap (6) has an open annular groove (802) on its end face facing the main cavity (16). The opening of the annular groove (802) at any circumferential position of the end cap (6) is connected to the port of the second sliding cavity (8074). The air supply channel (804) is opened on the end cap (6) and faces the main cavity (16). A relay channel (803) is provided between the annular groove (802) and the air supply channel (804) for communication.

10. The bottle head valve with self-tuning pressure reduction function according to claim 1, characterized in that: The end cap (6) has an exhaust chamber (601) that opens into the main cavity (16) and an exhaust hole (603) that communicates with the bottom of the exhaust chamber (601) and extends out of the outer end face of the end cap (6). The third valve core (10) is movably mounted in the exhaust chamber (601). The inner wall of the exhaust chamber (601) facing the main cavity (16) has a retaining ring groove (602) for mounting a retaining ring (17). The retaining ring (17) is used to make the third valve core (10) have a set stroke in the exhaust chamber (601). When the thrust generated by the medium discharged through the exhaust chamber (601) and the exhaust hole (603) is greater than the weight of the third valve core (10), the third valve core (10) blocks the exhaust hole (603).

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