Container valve and fire extinguishing system thereof

Abstract

The application relates to the fire-fighting technical field and particularly relates to a container valve and a fire extinguishing system thereof, which solve the problem of leakage of a self-sealing container valve during opening or closing of a self-pressure relief port of extinguishing agent. The application is provided with a pressure relief valve core assembly with a main core body and a secondary core body and a step-controlled pressure relief control mechanism. When the container valve is opened, the secondary core body is first controlled to descend to block the first flow channel (a communication inlet channel), and then the main core body is controlled to descend to open the pressure relief port. When the container valve is closed, the main core body is first controlled to ascend to block the pressure relief port, and then the secondary core body is controlled to ascend to open the first flow channel. The timing control mechanism completely avoids the problem of connection of the pressure relief gap caused by the temporary separation of the pressure relief piston from the sealing surface during the action conversion process, thereby eliminating the risk of accidental spraying of the extinguishing agent from the pressure relief port, significantly improving the sealing safety, and avoiding waste of the extinguishing agent and human body injury.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology, specifically to a container valve and its fire extinguishing system. Background Technology

[0002] Container valves are key components of pressure vessels (such as gas cylinders, reaction vessels, and fire extinguishing equipment), primarily used for sealing media, controlling media release, filling, and safety protection. In the field of fire protection technology, they are control valves installed at the outlet of storage cylinders, their function being to seal the cylinders under normal conditions and release extinguishing agents in case of fire.

[0003] Traditionally, the container valves installed on fire extinguisher cylinders are generally divided into diaphragm type and self-sealing type.

[0004] A diaphragm-type container valve, such as the manual container valve for driving gas cylinders in Chinese invention patent application CN106958679A, stores high-pressure gas inside the gas cylinder. A diaphragm is installed on an annular step between the inner cavity of the gas cylinder and the valve interface. The diaphragm is fixed by a clamping nut to seal the high-pressure gas inside the gas cylinder. A piercing needle is also installed inside the valve body. The upper end of the piercing needle extends out of the outer side of the valve body through a needle hole, with the needle tip facing the diaphragm. A pin is installed on the side wall of the part of the piercing needle that extends out of the needle hole to prevent the piercing needle from completely entering the valve body. A valve seat is also installed at the upper end of the valve body, and a pressure rod is hinged to the valve seat. The operator can first remove the pin, and then press the piercing needle down through the pressure rod to pierce the diaphragm with the needle tip. In this way, the high-pressure gas inside the gas cylinder can enter the valve cavity of the valve body, and then flow out from the gas outlet on the valve body to drive the relevant fire extinguisher to extinguish the fire. Diaphragm-type valves can only be opened once and cannot close automatically, causing all gas inside the tank to be released at once. They cannot be reused after a single reinstallation. Furthermore, after use, a professional technician must disassemble the valve and replace the diaphragm before it can be used again, a complex process. Also, the valve cannot be closed during use. Self-sealing container valves mainly consist of a piston, valve core, sealing surface, and control rod. Normally, the piston tightly seals against the valve seat sealing surface under the pressure difference between the medium and the back pressure chamber, blocking the flow of the medium. When opening is needed, the back pressure chamber pressure is quickly released through the operating mechanism (such as a handle or electric actuator), causing the piston to move upwards under the pressure of the medium, thus opening the passage. For example, Chinese invention patent application CN117588588A describes a reusable container valve. This application provides a reusable container valve with the following technical solution: A reusable container valve includes a valve body with an inlet channel and a discharge channel that are interconnected. A pressure chamber is provided within the valve body, and a main piston is slidably mounted within the pressure chamber. A first elastic unit is provided within the pressure chamber, which pushes the main piston to isolate the inlet channel from the discharge channel. The air pressure in the inlet channel exerts a force on the main piston to overcome the movement of the first elastic unit. A pressure relief port is provided on the valve body, and a control device is provided within the valve body. The control device controls the closure of the inlet channel and connects the pressure chamber to the pressure relief port, or controls the closure of the pressure relief port and connects the pressure chamber to the inlet channel. By adopting the above technical solution, the valve body is installed on a high-pressure gas tank, the inlet channel of the valve body is connected to the opening of the tank, and the discharge channel of the valve body is connected to a fire-fighting pipeline.When the control device connects the pressure chamber to the inlet channel, the air pressure in the pressure chamber is the same as that in the inlet channel. The air pressure in the pressure chamber, in conjunction with the first elastic unit, pushes the main piston, causing it to isolate the inlet channel from the discharge channel. At this time, the container valve is in the closed state. When the control device connects the pressure chamber to the pressure relief port, the pressure chamber is depressurized. The air pressure in the inlet channel pushes the main piston against the first elastic unit, connecting the inlet channel and the discharge channel. At this time, the container valve is in the open state. Through this method, the operator controls the connection between the pressure chamber and the pressure relief port or the inlet channel, thereby controlling the opening and closing of the valve body, achieving the effect of repeated valve opening. The operator can control the amount of extinguishing agent discharged according to the size of the fire source, reducing waste caused by excessive extinguishing agent discharge. Even if the fire reignites, the reignited fire can be extinguished by repeatedly opening the container valve. While this invention allows for repeated opening and closing, enabling the reuse of the extinguishing agent within the fire extinguisher, when the container valve needs to be opened, the electromagnet controls the pressure relief piston to move downwards, closing the first flow channel (connecting the inlet channel) and connecting the pressure chamber and the pressure relief port. The pressure chamber is depressurized, and the air pressure in the inlet channel pushes the main piston against the force of the first elastic element, connecting the inlet channel and the discharge channel. When the container valve is closed, the pressure relief piston is controlled to rise, closing the pressure relief port and connecting the pressure chamber and the inlet channel. When the pressure relief port is closed and the pressure chamber is connected to the inlet channel, the air pressure in the inlet channel, in conjunction with the pressure chamber and the first elastic unit, pushes the main piston to move, isolating the inlet channel and the discharge channel, thus closing the container valve. However, a pressure relief gap is left between the peripheral wall of the pressure relief piston and the inner wall of the pressure relief channel for pressure relief, and this gap is connected to the pressure chamber. When the container valve is opened or closed, the pressure relief piston will be in a state where it is not in contact with the second convex ring. This will cause the pressure relief gap on one side of the pressure relief piston to briefly connect the first flow channel (connecting the inlet channel) and the pressure relief port, resulting in the extinguishing agent being sprayed out from the pressure relief port and leaking. The leakage of extinguishing agent not only leads to the waste of extinguishing agent, but also the extinguishing agent sprayed at high pressure from the pressure relief port can easily spray onto the human body and cause harm. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a container valve and its fire extinguishing system, which solves the problem of fire extinguishing agent leakage from the self-sealing container valve described in the background art during opening or closing.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] A container valve includes a valve body, a valve cavity disposed within the valve body, and an inlet channel and an outlet channel respectively communicating with the valve cavity, and further includes:

[0008] A valve cover assembly is sealed to the upper opening of the valve body, and a first receiving cavity is formed at its lower part, with the opening of the first receiving cavity facing the outlet channel.

[0009] The valve core body is slidably fitted in the first receiving cavity, and a first sealing structure is provided between its peripheral wall and the inner wall of the first receiving cavity. A first elastic element is connected between the valve core body and the top wall of the first receiving cavity, which is used to cooperate with the pressure of the valve cavity to drive the valve core body to close or open the outlet channel.

[0010] The second receiving cavity is located inside the valve cover assembly and above the first receiving cavity. Its bottom wall is provided with a first flow channel communicating with the valve cavity and a second flow channel communicating with the first receiving cavity, and its top is provided with a pressure relief port.

[0011] A pressure relief valve core assembly includes a main core and a secondary core. The main core is vertically slidably installed in a second receiving cavity and connected to the bottom wall of the second receiving cavity by a second elastic element. The secondary core is slidably embedded in a first sliding groove at the bottom of the main core. A vertical third elastic element is provided between the main core and the secondary core. A first control rod extends upward from the main core, and a second control rod extends upward from the secondary core. A pressure relief gap exists between the pressure relief valve core assembly and the side wall of the second receiving cavity.

[0012] The pressure relief control mechanism, linked to the first and second control levers, is used for step-by-step control of the container valve.

[0013] When starting: first drive the secondary core to move down and block the first flow channel, then drive the main core to move down and open the pressure relief port;

[0014] When shutting down: First, drive the main core to move upward to block the pressure relief port, then drive the secondary core to move upward to open the first flow channel.

[0015] Furthermore: the valve cavity is provided with a first flange surrounding the outlet channel, and the lower end of the valve core extends outward beyond the first flange to form a pressure-bearing surface.

[0016] Furthermore: the pressure relief control mechanism includes:

[0017] Rotatable support shaft;

[0018] The first disc cam and the second disc cam, fixed on the support shaft, are in contact with the first control lever and the second control lever, respectively;

[0019] The transmission mechanism is used to drive the support shaft to rotate in both directions.

[0020] Furthermore: the first disc cam has a first smooth section and a first downward section;

[0021] The second disc cam has a second downward pressing section and a second smoothing section;

[0022] Activation sequence: When the support shaft rotates forward, the second pressing section drives the sub-core to move down and block the first flow channel, while the first smoothing section keeps the main core blocking the pressure relief port. Subsequently, the second smoothing section keeps the sub-core blocking the first flow channel, while the first pressing section drives the main core to move down and open the pressure relief port.

[0023] Closure sequence: When the support shaft reverses, the first pressing section and the second elastic element drive the main core to move upward to block the pressure relief port, while the second smoothing section keeps the secondary core blocking the first flow channel. Subsequently, the second pressing section and the third elastic element drive the secondary core to move upward to open the first flow channel, while the first smoothing section keeps the main core blocking the pressure relief port.

[0024] Furthermore, the transmission mechanism includes a transmission gear fixedly connected to the supporting shaft and a transmission rack meshing with the drive gear.

[0025] Furthermore: the first control rod is provided with an axial through cavity, and a second slide groove is provided in the main core above the first slide groove. The second control rod of the sub-core extends out by passing through the first slide groove, the second slide groove and the axial through cavity in sequence.

[0026] Further:

[0027] The pressure relief port is provided with a second flange around it, and a second sealing gasket that seals with the second flange is embedded at the upper end of the main core.

[0028] The second receiving cavity has a third flange surrounding the first flow channel, and the lower end of the sub-core is fitted with a third sealing gasket that seals with the third flange.

[0029] Furthermore, the first elastic element, the second elastic element, and the third elastic element are all configured as spring elements, and the axis of the spring element is arranged coaxially with the movement direction of the corresponding core.

[0030] Furthermore, the sidewall of the second receiving cavity is provided with at least one vertically extending guide groove, and the sidewall of the main core is fixedly connected with a guide slider, which is slidably fitted into the guide groove to constrain the circumferential rotation of the main core and limit its axial movement trajectory.

[0031] A fire extinguishing system includes a fire extinguisher tank, wherein the outlet of the fire extinguisher tank is equipped with a container valve as described above.

[0032] The beneficial effects of this invention are:

[0033] 1. Effectively eliminates extinguishing agent leakage during pressure relief: By setting up a pressure relief valve core assembly with a main core and a secondary core, and a step-by-step pressure relief control mechanism, when opening the container valve, the secondary core is first controlled to descend and block the first flow channel (connecting the inlet channel), and then the main core is controlled to descend and open the pressure relief port; when closing, the main core is first controlled to rise and block the pressure relief port, and then the secondary core is controlled to rise and open the first flow channel. This timing control mechanism completely avoids the problem of pressure relief gap connection caused by the pressure relief piston briefly disengaging from the sealing surface during the action transition, thereby eliminating the risk of extinguishing agent accidentally spraying out from the pressure relief port, significantly improving sealing safety, and avoiding extinguishing agent waste and personal injury.

[0034] 2. Achieving reliable and repeatable opening and closing with precise flow control: The pressure relief valve core assembly, combined with a dual-disc cam timing control mechanism (the first disc cam drives the main core, and the second disc cam drives the auxiliary core), precisely regulates the action sequence and stroke of the main / auxiliary cores through the forward and reverse rotation of the support shaft. This structure ensures no crossflow or leakage during valve opening and closing, while allowing the operator to repeatedly start and stop the container valve according to the fire situation, flexibly adjusting the extinguishing agent release amount with each use, and avoiding resource waste caused by over-spraying.

[0035] 3. Optimized sealing design for improved long-term reliability: A second sealing gasket is installed at the upper end of the main core, which mates with the second flange of the pressure relief port, and a third sealing gasket is installed at the lower end of the auxiliary core, which mates with the third flange of the first flow channel. This dual-stage sealing design, combined with a resilient element reset mechanism, effectively isolates the high-pressure medium from the pressure relief channel, enhancing the valve's sealing durability under repeated opening and closing conditions and reducing maintenance frequency. 4. Simplified system structure for reduced operation and maintenance costs: The pressure relief valve core assembly adopts a nested sliding structure (the auxiliary core is placed within the first groove of the main core), resulting in high space utilization and a compact structure, facilitating mass production and integrated installation, and reducing production and maintenance costs. Attached Figure Description

[0036] Figure 1 This is the front view of the present invention;

[0037] Figure 2 This is a right view of the present invention;

[0038] Figure 3 This is a perspective view of the present invention;

[0039] Figure 4 For the present invention Figure 1 Sectional view along line AA;

[0040] Figure 5 For the present invention Figure 2 Sectional view along the BB direction;

[0041] Figure 6 For the present invention Figure 4 Enlarged view of the upper and middle sections;

[0042] Figure 7 This is a perspective view of the pressure relief valve core assembly and pressure relief control mechanism of the present invention;

[0043] Figure 8 for Figure 7 A 3D view with the control casing removed;

[0044] Figure 9 This is a structural diagram showing the fit between the cam and the pressure relief valve core assembly.

[0045] Figure 10 This is a structural diagram of the pressure relief valve core assembly of the present invention (the secondary core body descends a certain distance).

[0046] Figure 11 The diagram shows the structure of the opening and closing process of this invention (where a is the initial state where the pressure relief port is closed and the first flow channel is open, b is the state where the sub-core descends to block the first flow channel and the pressure relief port is blocked, c is the state where the first flow channel is blocked and the pressure relief port is open, and d is the state where the first flow channel is closed and the pressure relief port is closed).

[0047] Figure 12 This section introduces the existing explosion-proof structures and pressure gauge structures.

[0048] Figure 13 for Figure 5 Enlarged view of section C;

[0049] Figure 14 This is a schematic diagram of a double cross-section of the first flow channel and the second flow channel for the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] Valve body 1, valve chamber 10, inlet channel 11, outlet channel 12, first flange 13;

[0052] Valve cover assembly 2, first receiving cavity 21, second receiving cavity 22, first flow channel 221, second flow channel 222, pressure relief port 223, second flange 224, third flange 225, pressure relief gap 226;

[0053] Valve core body 3, first sealing structure 31, first elastic element 32, pressure bearing surface 33, first sealing gasket 34; valve core screw 35;

[0054] Pressure relief valve core assembly 4, main core 41, first slide groove 411, first control rod 412, axial through cavity 4121, second slide groove 413, second sealing gasket 414, guide slider 415, auxiliary core 42, second control rod 421, third sealing gasket 422, second elastic element 43, third elastic element 44.

[0055] Pressure relief control mechanism 5, support shaft 51, first disc cam 52, first smooth section 521, first pressing section 522, second disc cam 53, second pressing section 531, second smooth section 532, transmission mechanism 54, transmission gear 541, transmission rack 542, sliding guide groove 543, sliding guide rod 544, sliding guide block 545, electromagnetic push rod 55, control housing 56;

[0056] Explosion-proof structure 6, explosion-proof channel 61, annular mounting platform 62, copper ring 63, rupture disc 64, pressure relief bolt 65, pressure relief channel 66; pressure gauge structure 7, connecting cylinder 71, air inlet 72, air inlet 73, locking nut 74, countersunk groove 75, pressure gauge annular gasket 76, through hole 77. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0058] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0059] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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. Unless otherwise stated, these directional terms 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 on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0060] It should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0061] For ease of description, the orientation in this invention is... Figure 5 As shown in the description, the X-axis is defined as horizontal and the Y-axis is defined as vertical.

[0062] As one embodiment, this invention discloses a container valve installed at the nozzle of a fire extinguisher bottle in a fire extinguishing system. When the container valve opens, the high pressure inside the fire extinguisher propels the extinguishing agent out of the container valve. This container valve is particularly suitable for gaseous fire extinguishing systems, such as perfluorohexanone (PFH)-based clean gas fire extinguishing systems. PFH is a general term for fire extinguishing agents with perfluorohexanone or perfluorohexanone as the main component and additives. A PPH clean gas fire extinguishing system is a clean gas fire extinguishing system with perfluorohexanone or perfluorohexanone as the main component and additives, consisting of extinguishing agent cylinders, a drive device, and discharge components.

[0063] The container valve has a valve body 1, a valve cavity 10 disposed within the valve body 1, and an inlet channel 11 and an outlet channel 12 respectively connected to the valve cavity 10. Figure 5 As shown, the inlet channel 11 is located on the transverse side wall of the valve body 1, and the outlet channel is located at the bottom of the valve body 1. The inlet channel 11 is connected to the siphon tube inside the extinguishing agent tank. During fire extinguishing, the extinguishing agent is sprayed out from the siphon tube, the inlet channel 11, the valve cavity 10, and the outlet channel 12. The valve cavity 10 extends upward to form an upper opening. The container valve also has a valve cover assembly 2, which is sealed to the upper opening of the valve body 1. The lower part of the valve cover assembly 2 extends downward into the valve cavity 10, forming a first receiving cavity 21 with an open lower end. The lower end of the first receiving cavity 21 faces the outlet channel 12 located at the lower end. A pressure relief port is provided at the top of the valve cover assembly 2. Preferably, the intruded part of the valve cover assembly 2 and the valve cavity 10 are threaded together.

[0064] In the structure of the above-mentioned container valve, the lower intrusion section of the valve cover assembly 2 serves as an internal reinforcing skeleton, forming an annular support structure with the inner wall of the valve body 1, jointly resisting the radial expansion force generated by the high-pressure medium in the valve cavity 10.

[0065] The container valve also has a valve core 3, which is slidably fitted within a first receiving cavity 21 at the lower part of the valve cover assembly 2. A first sealing structure 31 is provided between the peripheral wall of the valve core 3 and the inner wall of the first receiving cavity 21. The first sealing structure 31 consists of an annular groove surrounding the peripheral wall of the valve core 3 and a sealing ring disposed within the annular groove. The sealing ring is in a state of being squeezed by the valve core 3 and the inner wall of the first receiving cavity 21 to form a seal. Under radial compression, the sealing ring in the annular groove of the peripheral wall of the valve core 3 forms a dynamic radial seal with the inner wall of the first receiving cavity 21, blocking the axial flow of the high-pressure medium. A first elastic element 32 is connected between the upper end of the valve core 3 and the upper end of the first receiving cavity 21. Preferably, the first elastic element 32 is a spring, which provides elastic force to make the valve core 3 move toward the outlet channel 12 and press against the outlet channel 12. To improve the sealing effect, a first sealing gasket 34 is embedded in the lower end of the valve core body 3. The first sealing gasket 34 is pressed into the center of the valve core body 3 by a valve core screw 35, which is smaller than the outlet channel 12 and can enter the outlet channel 12. A first flange 13 is provided in the valve cavity 10, surrounding the outlet channel 12. The first sealing gasket 34 presses on the first flange 13 to form a sealing mechanism. The lower end face of the valve core body 3 extends outward beyond the first flange 13 to form a pressure-bearing surface 33. The first flange 13 is provided so that the lower end face of the valve core body 3 is spaced from the bottom of the valve cavity 10. In particular, when the pressure-bearing surface 33 formed by the outwardly extending part of the lower end face of the valve core body 3 is spaced from the bottom of the valve cavity 10, the high pressure in the valve cavity 10 can be effectively applied to the pressure-bearing surface 33 of the valve core body. When the container valve opens, the high pressure inside the valve chamber 10 applies pressure to the pressure-bearing surface 33, overcoming the pressure of the first elastic element 32, forcing the valve core 3 to rise and open the outlet channel 12, allowing the extinguishing agent to be ejected at high pressure from the outlet channel 12. In this embodiment, a flange and a sealing gasket are used in conjunction. For example, the first flange 13 serves as a ring-shaped rigid support base, forming a "hard-soft composite sealing pair" with the soft sealing surface of the first sealing gasket 34. When the valve core 3 is pushed by the first elastic element 32, the first sealing gasket 34 undergoes axial compression deformation, fully filling the microscopic unevenness of the flange surface. The chamfered design of the first flange 13 guides the deformation direction of the sealing gasket, avoiding edge stress concentration.

[0066] The container valve also includes a valve cover assembly 2, and a sealing ring is provided at the connection between the valve cover assembly 2 and the valve body 1. The valve cover assembly 2 has a second receiving cavity 22 located above the first receiving cavity 21. A first flow channel 221 is provided at the center of the bottom wall of the second receiving cavity 22, and the first flow channel 221 connects to the valve cavity 10 below. A second flow channel 222 is also provided on the bottom wall of the second receiving cavity 22, and the second flow channel 222 connects to the first receiving cavity 21 above the valve core 3. A pressure relief port 223 is provided at the top of the second receiving cavity 22. When the pressure relief port 223 is closed and the first flow channel 221 and the second flow channel 222 are opened, the high-pressure medium in the inlet channel 11 enters the first receiving cavity 21 through the valve cavity 10, the first flow channel 221, the second receiving cavity 22, and the second flow channel 222, making the pressure in the valve cavity 10 and the first receiving cavity 21 the same. Then, the upper end of the valve core 3 is subjected to high pressure and the downward pressure of the first elastic element 32, and the pressure-bearing surface 33 at the lower end of the valve core 3 is subjected to upward pressure. At this time, the downward pressure is greater than the upward pressure (the area of ​​the pressure-bearing surface at the upper end of the valve core 3 is set to be greater than the area of ​​the pressure-bearing surface 33 at its lower end, so that the valve core 3 is subjected to the downward pressure of the first elastic element 32 and the pressure difference at the same time, thus sealing it more firmly on the outlet channel 12). The valve core 3 is pressed on the outlet channel 12, thus sealing the outlet channel 12, the container valve is closed, and the extinguishing agent cannot be sprayed out.

[0067] A pressure relief valve core assembly 4 is disposed within the second receiving cavity 22. This assembly includes a main core 41 and a secondary core 42. The main core 41 has a first groove 411 at its bottom and a second groove 413 with a smaller diameter at its upper end. The secondary core 42 is vertically slidably connected within the first groove 411. When the secondary core is pulled upwards by a third elastic member 44, its upper end abuts against the upper wall of the first groove 411 due to the smaller diameter of the second groove 413. To prevent gas leakage, a second sealing structure is provided between the secondary core 42 and the first groove 411. An annular groove is provided around the outer wall of the secondary core 42, and a sealing ring within this groove forms a seal. A second elastic member 43, preferably a spring, is connected between the bottom of the main core 41 and the bottom wall of the second receiving cavity 22. The second elastic member 43 applies elastic force to cause the main core 41 to close the pressure relief port 223 upwards. A third elastic element 44, preferably a spring, is connected within the second slide groove 413. The other end of the third elastic element 44 is connected to the secondary core 42. The third elastic element 44 applies tension to keep the secondary core 42 within the first slide groove 411 of the main core 41. The projected area of ​​the secondary core 42 from top to bottom is within the projected area of ​​the main core 41. A pressure relief gap 226 exists between the main core 41 and the sidewall of the second receiving cavity 22. The second receiving cavity 22 can communicate with the outside atmosphere through the first receiving cavity 21, the pressure relief gap 226, and the pressure relief port 223. A vertical first control rod 412 is fixed at the center of the upper surface of the main core 41. This first control rod 412 has a through axial cavity 4121. A second control rod 421 is located at the upper end of the secondary valve core, and the second control rod 421 is placed within the second slide groove 413 and extends through the axial cavity 4121 of the first control rod 412. In this embodiment, both the first control rod 412 and the second control rod 421 extend upwards through the pressure relief port, and there is a certain gap between the first control rod 412 and the peripheral wall of the pressure relief port for pressure relief. The first control rod 412 is used to control the main core 41 to move downwards against the elastic force of the second elastic member 43 to open the pressure relief port 223, and the second control rod 421 is used to control the secondary core 42 to block the first flow channel 221 downwards against the pulling force of the third elastic member 44.

[0068] In the structure of the aforementioned pressure relief valve core assembly 4, a small groove is coaxially arranged on the large groove at the bottom of the main core 41, allowing the secondary core 42 to slide up and down within the large groove without dislodging—this mechanical limiting is both simple and reliable. The spring tension of the third elastic element 44 keeps the secondary core normally upright, while the spring of the second elastic element 43 is stronger, ensuring that the main core 41 preferentially seals the pressure relief port. The second control rod 421 of the secondary core 42 passes through the axial cavity of the main core 41, with the two rods moving independently yet physically isolated. In this way, a single pressure relief control mechanism can operate the two valve cores separately, eliminating the need for a complex transmission structure. As an intelligent switch connecting the valve chamber 10 (high-pressure zone) and the pressure relief port 223 (low-pressure zone), the flow path of the high-pressure medium is precisely controlled through the stepwise actions of the main and secondary cores. By controlling the opening and closing of the first flow channel 221, it is determined whether the high-pressure medium enters the first receiving cavity 21, thereby affecting the opening and closing of the valve core 3 (pressure difference drive principle). The dual-valve-core nested design and independent sealing structure maintain at least one sealing barrier during operation switching, preventing accidental leakage of high-pressure media. The dual valve cores are nested within a single cavity, reducing space requirements. At least one seal is always present during the operation transition, achieving "zero-leakage switching" (especially for highly permeable media such as perfluorohexanone).

[0069] The container valve also includes a pressure relief control mechanism 5, which is linked with the first control lever 412 and the second control lever 421 to control the container valve in steps. When the container valve is opened: the second control lever 421 first drives the auxiliary core 42 to move down and block the first flow channel 221 (the first flow channel 221 connects to the valve chamber 10, thus sealing the valve chamber 10 and the first receiving chamber 21), so that the high-pressure medium in the inlet channel 11 cannot continue to connect to the second receiving chamber 22. At this time, the pressure relief port 223 is still closed by the main core 41 to prevent the high-pressure gas in the fire extinguisher from being sprayed out of the pressure relief port 223 when the pressure relief port 223 is opened. Then, the first control lever 412 drives the main core 42 to move down and block the first flow channel 221 (connecting to the valve chamber 10, thus sealing the valve chamber 10 and the first receiving chamber 21). When the core 41 moves downwards, it opens the pressure relief port 223. At this time, the first flow channel 221 is closed, and the high-pressure extinguishing gas in the fire extinguisher container will not be ejected from the pressure relief port 223. The first receiving cavity 21 is connected to the outside through the second receiving cavity 22, the pressure relief gap 226 and the pressure relief port 223. As a result, the pressure in the first receiving cavity 21 is depressurized, which causes the high pressure in the valve cavity 10 to push the pressure bearing surface 33 at the lower end of the valve core 3 to overcome the pressure of the first elastic element 32 and move upwards, thereby opening the outlet channel 12. The extinguishing agent is ejected from the outlet channel 12. When the container valve needs to be closed, under the upward elastic force of the second elastic element 43, the pressure relief control mechanism 5 and the second elastic element 43 control the main core 41 to move upward to close the pressure relief port 223. During this process, the first flow channel 221 is still blocked, so that the high-pressure gas in the fire extinguisher canister will not be ejected from the pressure relief port 223. Then, the upward pulling force of the third elastic element 44 and the pressure relief control mechanism 5 control the auxiliary core 42 to move upward to open the first flow channel 221, so that the high-pressure gas in the fire extinguisher canister enters the first receiving cavity 21 through the valve cavity 10, the first flow channel 221, the second receiving cavity 22, and the second flow channel 222. Under the pressure of the first receiving cavity 21 on the upper end face of the valve core 3 and the downward elastic force of the first elastic element 32 on the valve core 3, the pressure of the lower end pressure bearing surface 33 of the valve core 3 is overcome, so that the valve core 3 moves downward to block the outlet channel 12, and the container valve is closed.

[0070] In a preferred embodiment of the pressure relief control mechanism 5, the pressure relief control mechanism 5 includes a control housing 56 with a through-cavity for mounting a support shaft 51 and a disc cam. The control housing 56 is detachably fixed to the top of the valve cover assembly 2 by bolts. A horizontally placed support shaft 51 is rotatably mounted within the control housing 56. A first disc cam 52 and a second disc cam 53 are fitted onto the support shaft 51. A transmission mechanism 54 is also included, which drives the support shaft 51 to rotate forward and backward. A power mechanism is also included; in this embodiment, an electromagnetic push rod 55 is selected as the power mechanism. The power mechanism provides power to the transmission mechanism 54 to drive the support shaft 51 to rotate forward and backward. The outer edge of the first disc cam 52 abuts against the top of the first control rod 412, and the outer edge of the second disc cam 53 abuts against the top of the second control rod 421. The first disc cam 52 has a first smooth section 521 and a first downward section 522 connected thereto. The second disc cam 53 has a second downward section 531 and a second smooth section 532 connected thereto. The smooth section is an arc equidistant from the center of rotation, and the downward section is a slope or arc surface with a gradually changing distance from the center of rotation. When the container valve needs to be opened: the support shaft 51 rotates clockwise, the second downward section 531 drives the secondary core 42 to move downward to block the first flow channel 221, while the first smooth section 521 keeps the main core 41 blocking the pressure relief port 223. Subsequently, the second smooth section 532 keeps the secondary core 42 blocking the first flow channel 221, while the first downward section 522 drives the main core 41 to move downward to open the pressure relief port 223. During the downward movement of the secondary core 42, the pressure relief port 223 is still blocked by the main core 41, so that the high-pressure gas in the fire extinguisher canister will not escape from the pressure relief port 223. When the main core 41 begins to move downward and open the pressure relief port 223, the first flow channel 221 has been blocked by the secondary core 42, so that the high-pressure gas in the fire extinguisher canister will not be leaked. When the first flow channel 221 is blocked and the pressure relief port 223 is opened, the first receiving cavity 21 cannot connect to the valve cavity 10 and connects to the pressure relief port 223 through the second receiving cavity 22, causing a loss of pressure. This causes the pressure-bearing surface 33 of the valve core 3 to be subjected to high pressure, overcome the pressure of the first elastic element 32, and open the outlet channel 12 upward. The extinguishing agent is sprayed out from the outlet channel 12.When the container valve needs to be closed: the support shaft 51 reverses, and the contact point between the first pressing section 522 and the first control lever 412 gradually moves towards the direction closer to the rotation center, causing the contact point to move away from the control lever. Driven by the second elastic element 43, the main core 41 moves upward to block the pressure relief port 223. At the same time, the second stabilizing section 532 keeps the secondary core 42 blocking the first flow channel 221. During this process, the secondary core 42 always blocks the first flow channel 221 to prevent the high-pressure gas in the fire extinguisher canister from being ejected. Subsequently, the contact point between the second pressing section 531 and the third elastic element 44 moves towards the direction closer to the rotation center, causing the contact point to move away from the control lever. The control lever moves in a direction, and under the tension of the third elastic element 44, it drives the secondary core 42 to move upward and open the first flow channel 221. At the same time, the first stable section 521 keeps the main core 41 blocking the pressure relief port 223. During the process of the secondary core 42 opening the first flow channel 221, the main core 41 always blocks the pressure relief port 223 to prevent the extinguishing agent from leaking. When the container valve is closed, the high pressure in the valve cavity 10 enters the first receiving cavity 21 through the first flow channel 221, the second receiving cavity 22, and the second flow channel 222. Under the pressure of the high pressure and the pressure of the first elastic element 32, the valve core 3 overcomes the pressure of its lower end bearing surface 33 and moves downward to block the inlet channel 11, and the extinguishing agent stops spraying.

[0071] In the aforementioned pressure relief control mechanism 5, the dual-valve-core linkage logic is transformed into the rotational motion of a single shaft. The cam profile precisely controls the sequence and timing of the actions of the main and auxiliary cores. Traditional solenoid valves directly drive the valve core, causing it to rise or fall as a whole. For a brief period, the valve chamber is directly connected to the pressure relief port, leading to leakage of high-pressure extinguishing agent. This mechanism uses a mechanical cam to force step-by-step separation, completely eliminating transient leakage during opening and closing. When opening: Auxiliary core 42 blocks the flow channel (isolates high pressure) → Main core 41 opens the pressure relief port (safe pressure relief). When closing: Main core 41 seals the pressure relief port (isolates from the outside) → Auxiliary core 42 opens the flow channel (restores pressure). At least one sealing barrier is always present during the switching process (see...). Figure 11 (AD process verification). The cam depressor section provides mechanical interference force to ensure the sealing pair is fully compressed. The cam smoothing section locks the valve core position during non-operational phases to prevent unexpected operation caused by vibration / pressure fluctuations.

[0072] Since the elastic force of the second elastic element 43 is greater than that of the third elastic element 44, and there is high pressure in the second receiving cavity 22 during the container valve closing process, the main valve core is sealed on the pressure relief port 223 under the elastic force of the second elastic element 43 and the high pressure when the pressure relief port 223 is blocked, making the sealing of the pressure relief port 223 more reliable. Furthermore, when the secondary core 42 moves downward to block the first flow channel 221, the main core 41 cannot be pulled down under the pulling force of the third elastic element 44, ensuring the reliability of the sealing of the main core 41.

[0073] As a preferred example of the top of the first control lever 412 and the second control lever 421, both of their tops are dome-shaped, which facilitates their cooperation with the disc cam.

[0074] As one embodiment of the transmission mechanism 54 in the pressure relief control mechanism 5, it has a transmission rack 542. A vertical sliding guide groove 543 is provided in the control housing 56. A vertical sliding guide rod 544 is fixed in the sliding guide groove 543. A sliding guide block 545 is fixed to the back of the transmission rack 542 and is vertically slidably connected in the sliding guide groove 543. The center hole of the sliding guide block 545 is slidably sleeved in the sliding guide rod 544. The sliding guide groove 543, the sliding guide rod 544, and the sliding guide block 545 restrict the transmission rack 542 to move only vertically, forcibly restricting the transmission rack 542 to move only vertically, avoiding the rack from deviating, tilting, or rotating during movement, ensuring that the transmission rack 542 and the transmission gear 541 always maintain stable meshing, and ensuring the accuracy of power transmission. When installing the fire extinguishing system, an electromagnetic push rod 55 is installed on the top of the upper valve cover. The free end of the electromagnetic push rod 55 is connected to the transmission rack 542 to drive the transmission rack 542 to move up and down. The transmission rack 542 meshes with a transmission gear 541 that is fixed to the support shaft 51. The up-and-down movement of the transmission rack 542 drives the transmission gear 541 to rotate the support shaft 51 in both directions. Of course, the electromagnetic actuator can also be replaced with other linear actuators, such as electric actuators.

[0075] In the aforementioned pressure relief control mechanism 5, the meshing transmission of the rack and pinion has high transmission accuracy. Combined with the strict limiting of the rack by the guide structure, the rotation angle of the supporting shaft 51 can be precisely controlled, allowing the disc cam to push the control rod along a preset trajectory. This precision ensures the sequential action of the main and auxiliary cores (e.g., sealing the flow channel before opening the pressure relief port when opening), completely avoiding the transient leakage problem caused by poor synchronization of actions when directly driven by traditional solenoid valves (the document mentions the defect of "direct connection between the valve cavity and the pressure relief port for a short period of time" in traditional structures). The combination of the sliding guide groove, guide rod, and guide block forms a rigid guiding constraint, effectively resisting the influence of high pressure in the valve cavity or external vibration on the transmission rack, ensuring that the rack and pinion are always stably meshed, and avoiding malfunctions of the container valve due to transmission failure (e.g., accidental opening or closing). At the same time, this structure reduces transmission errors caused by component wear during long-term use, extending the service life of the equipment. For highly penetrating extinguishing agents such as perfluorohexanone, the sealing requirements are extremely high. This transmission mechanism ensures that "at least one sealing barrier always exists" during the opening and closing of the container valve by precisely controlling the action sequence of the main and auxiliary cores, effectively preventing accidental leakage of high-pressure media and adapting to the special application scenarios of gas extinguishing systems (especially clean gas extinguishing systems).

[0076] As a third sealing structure for the pressure relief port 223 and the first flow channel 221 within the second receiving cavity 22, the outlet of the first flow channel 221 within the second receiving cavity 22 is located at the center of the bottom wall of the second receiving cavity 22. A third flange 225 is provided around the first flow channel 221 within the second receiving cavity 22. A groove is formed at the lower end of the sub-core 42, in which a third sealing gasket 422 is fixed. The third sealing gasket 422 can completely cover the third flange 225 to seal the first flow channel 221 within the third flange 225. The third flange 225 allows for better cooperation with the third sealing gasket 422 to seal the first flow channel 221, and the third flange 225 enables the third sealing gasket 422 to... The third flange, positioned at the bottom of the second receiving cavity 22, prevents it from blocking the second flow channel 222, ensuring unobstructed flow between the first receiving cavity 21 and the second receiving cavity 22. This mechanism effectively improves the sealing performance of the first flow channel 221, preventing high-pressure media from entering the first receiving cavity 21 through the first flow channel 221 when the container valve is closed. This avoids accidental opening of the valve core 3 and enhances the stability and reliability of the container valve in its closed state. Furthermore, it prevents the third sealing gasket 422 from blocking the second flow channel 222, ensuring the normal operation of the gas flow path within the entire container valve. This allows the gas to flow along the designed path under different operating conditions, achieving normal opening and closing functions. The pressure relief port 223 is located at the center of the top wall of the second receiving cavity 22. A second flange 224 is located within the second receiving cavity 22 and surrounds the pressure relief port 223. A groove is located at the upper end of the main core 41, and a second sealing gasket 414 is embedded in the groove. The second sealing gasket 414 cooperates with the second flange 224 to seal the pressure relief port 223. This second flange mechanism greatly improves the sealing performance of the pressure relief port 223. When the container valve is closed, it ensures that the high-pressure gas inside the fire extinguisher tank will not be ejected from the pressure relief port 223, preventing extinguishing agent leakage and pressure loss. It also prevents outside air from entering, ensuring the safety and effectiveness of the fire extinguishing system. During the opening and closing of the container valve, it maintains stable internal system pressure, preventing pressure fluctuations caused by a poor seal of the pressure relief port 223, which could affect the normal operation of the valve core 3 and the overall performance of the container valve.

[0077] As an embodiment that restricts the main core 41 to move only vertically and not rotate, two sets of symmetrically arranged and vertically extending guide grooves are provided on the side wall of the second receiving cavity 22. A guide slider 415, which slides in cooperation with the guide grooves, is fixed to the side wall of the main core 41 to constrain the axial rotation of the main core 41 and limit its axial movement trajectory. By mechanically limiting the movement of the main core 41, it is forced to move only vertically (axially), completely blocking the possibility of rotation around its own axis, ensuring that the movement trajectory of the main core 41 strictly conforms to the design expectation. The first control rod 412 connected to the upper end of the main core 41 needs to continuously contact and cooperate with the first disc cam 52 in the pressure relief control mechanism 5. The stability of their relative position directly affects the accuracy of motion control. By restricting the rotation of the main core 41, the first control rod 412 can be prevented from shifting due to the rotation of the main core, ensuring that the disc cam and the control rod always maintain a preset contact relationship, guaranteeing the accuracy of power transmission and motion control. This ensures that the opening and closing action of the pressure relief port is precise and in place, avoiding high-pressure medium leakage due to seal misalignment.

[0078] As a general description of the use of a container valve in this invention, the container valve is installed on the fire extinguisher tank and the inlet channel 11 is connected to the siphon tube of the fire extinguisher.

[0079] The opening and closing process is as follows Figure 11 As shown, in the initial state, the container valve is in the closed state. At this time, the main valve core blocks the pressure relief port 223, and the first flow channel 221 and the second flow channel 222 are fully opened, so that the high-pressure gas in the fire extinguisher canister enters the valve chamber 10 through the inlet channel 11. At this time, the pressure in the valve chamber 10, the first flow channel 221, the second receiving chamber 22, the second flow channel 222 and the first receiving chamber 21 are the same. Under the pressure and the elastic force of the first elastic element 32, the upper end of the valve core 3 blocks the outlet channel 12, and the extinguishing agent cannot be sprayed out.

[0080] When the fire extinguisher needs to be opened, the electromagnetic push rod 55 pushes the transmission rack 542 downward. The transmission rack 542, through the transmission gear 541, drives the support shaft 51 to rotate clockwise. The support shaft 51 then drives the first disc cam 52 and the second disc cam 53 to rotate simultaneously. Figure 11As shown in diagram a, at this time, the first smooth section 521 of the first disc cam 52 abuts against the first control lever 412, and the second downward pressing section 531 of the second disc cam 53 abuts against the second control lever 421. During the rotation of the support shaft 51, because the first smooth section 521 abuts against the first control lever 412, the first control lever 412 and the main valve core connected to it maintain their current height and continue to block the pressure relief port 223 to prevent the extinguishing agent under high pressure from leaking from the pressure relief port 223. Because the second downward pressing section 531 abuts against the second control lever 421, as it rotates, the second downward pressing section 531 gradually presses down on the second control lever 421 and the auxiliary core 42 connected to it, moving downwards until the auxiliary core 42 blocks the first flow channel 221 (as shown in diagram a). Figure 11 (As shown in b). After the secondary core 42 blocks the first flow channel 221, it cuts off the connection between the valve chamber 10 and the second receiving chamber 22. The support shaft 51 continues to rotate, the first pressing section 522 contacts the first control rod 412, and the second stabilizing section 532 contacts the second control rod 421. The first pressing section 522 gradually presses down on the first control rod 412 and the main core 41 connected to it, opening the pressure relief port 223 (as shown in b). Figure 11 (As shown in c). During this process, the second stable section 532 controls the auxiliary core 42 to keep the first flow channel 221 blocked. After the pressure relief port 223 is opened (at this time, the first flow channel 221 is closed, so the valve cavity 10 and the second receiving cavity 22 are not connected), the pressure in the first receiving cavity 21 is released outward from the second flow channel 222, the second receiving cavity 22, the pressure relief gap 226 and the pressure relief port 223, so that the pressure in the first receiving cavity 21 is depressurized. Then, the pressure bearing surface 33 at the bottom of the valve core 3 pushes the valve core 3 against the elastic force of the first elastic element 32 and moves upward under the high pressure in the valve cavity 10, thereby opening the outlet channel 12. At this point, the extinguishing agent is sprayed out from the outlet channel 12.

[0081] When the fire extinguisher needs to be shut off, the electromagnetic push rod 55 pulls the transmission rack 542 upward. The transmission rack 542, through the transmission gear 541, drives the support shaft 51 to rotate in reverse. The support shaft 51 drives the first disc cam 52 and the second disc cam 53 to rotate simultaneously. At this time, the first downward section 522 of the first disc cam 52 abuts against the first control rod 412, and the second stable section 532 of the second disc cam 53 abuts against the second control rod 421. During the rotation of the support shaft, because the second stable section 532 abuts against the second control rod 421, the second control rod 421 and the auxiliary core 42 connected to it maintain their current height and continue to block the first flow channel 221 to prevent the extinguishing agent in the fire extinguisher from leaking. Because the first downward section 522 abuts against the second control rod 421, as the first downward section 522 rotates in reverse away from the first control rod 412, the main core 41 moves upward under the elastic force of the second elastic element 43 until it blocks the pressure relief port 223 (e.g., Figure 11As shown in d), after the pressure relief port 223 is blocked, the secondary core 42 will not leak when it moves upward. When the support shaft 51 continues to reverse, the first stable section 521 abuts against the first control rod 412, so that the main core 41 maintains its current height and continues to block the pressure relief port 223. The second downward pressure section 531 abuts against the second control rod 421. In the reverse situation, the second downward pressure section 531 gradually rotates away from the second control rod 421. Under the pulling force of the third elastic element 44, the secondary core 42 opens the first flow channel 221 upward. After the first flow channel 221 is opened, the high pressure in the fire extinguisher tank enters the second receiving cavity 22 through the first flow channel 221, and then enters the first receiving cavity 21 through the second flow channel 222. Then, under the pressure of the high pressure in the first receiving cavity 21 and the pressure of the first elastic element 32, it overcomes the pressure of the pressure bearing surface 33 at the bottom of the valve core 3 and moves downward to block the outlet channel 12 (as shown in d). Figure 11 As shown in a), the fire extinguisher stopped spraying extinguishing agent.

[0082] As an embodiment of the container valve of the present invention, the container valve in the prior art generally has an explosion-proof structure 6 and a pressure gauge structure 7. The above structures are all prior art. The following is only a certain introduction to the prior art and is not intended to be within the scope of protection of the present invention.

[0083] One type of explosion-proof structure 6 for container valves, such as Figure 12 As shown, an explosion-proof channel 61 is provided on one side of the peripheral wall of the valve body 1, communicating with the valve cavity 10. An outward-facing annular mounting platform 62 is located within the explosion-proof channel 61. A copper ring 63 is attached to the mounting platform, and a rupture disc 64 is attached to the outside of the copper ring 63. A pressure relief bolt 65 is threaded into the explosion-proof channel 61, which securely presses the rupture disc 64 and the copper gasket onto the annular mounting platform 62. The pressure relief bolt 65 has a pressure relief channel 66 facing the valve body opening, which connects to the outside atmosphere from the bolt head. Before the gas pressure inside the fire extinguisher canister rises to the critical explosion pressure, the rupture disc 64 will break due to the increased pressure inside the canister, allowing the gas inside the canister to be discharged promptly through the pressure relief channel 66, reducing the probability of the fire extinguisher canister exploding due to increased pressure during a fire.

[0084] One type of pressure gauge structure 7 for container valves, such as Figure 12As shown, a connecting cylinder 71 communicating with the inlet channel 11 is provided on one side of the valve body 1. An air inlet 72 is inserted into the connecting cylinder 71. The air inlet 72 has an air inlet channel 73 that opens outward and closes inward. Part of the air inlet 72 is located outside the connecting cylinder 71 and is used to connect a pressure gauge. A locking nut 74 is fitted over the air inlet 72 and is threaded onto the connecting cylinder 71, limiting one end of the air inlet 72 to be inside the connecting cylinder 71. A groove 75 for communicating with the pressure gauge is provided at the end of the air inlet 72 away from the valve body 1. A pressure gauge annular gasket 76 for sealing is fitted to the end face of the groove 75, and the pressure gauge is connected to the annular gasket. A through hole 77 communicating with the air inlet channel 73 is provided on the outer circular surface of the end of the air inlet 72 facing the valve cavity 10. A sealing ring is provided between the outer circular surface of the air inlet 72 and the connecting cylinder 71 between the through hole 77 and the groove 75 for sealing. An inner conical surface is provided inside the inflation channel 73, and an outer conical surface is provided at the inner end of the inflation nozzle 72. The outer conical surface is pressed against the inner conical surface under the pressure of the locking nut 74, thereby achieving the sealing effect on the inflation nozzle 72.

[0085] When the operator needs to check the pressure inside the tank, they loosen the locking nut 74. Under the pressure of the inlet channel 11, the inflation nozzle 72 is pushed open, allowing the pressure from the inlet channel 11 to pass through the through hole 77 and the inflation channel 73 to the pressure gauge, thus enabling monitoring of the tank's internal pressure. When inflation is needed, the pressure gauge is removed, and the inflation device is connected for inflation.

[0086] As an embodiment of the present invention, the present invention also provides a fire extinguishing system, which includes a fire extinguishing tank, the outlet of which is equipped with the container valve described in the above embodiment. When the fire extinguishing system equipped with the container valve is used, its fire extinguishing tank can be reused after a one-time refill, and leakage of extinguishing agent from the pressure relief port 223 is prevented. Especially when using a portable fire extinguisher, the high-pressure gas in the fire extinguisher cylinder equipped with the container valve of the present invention will not leak from the pressure relief port 223 at the top of the container valve during the opening of the container valve, thus avoiding injury to the operator.

Claims

1. A container valve, comprising a valve body (1), a valve cavity (10) disposed within the valve body (1), and an inlet channel (11) and an outlet channel (12) respectively communicating with the valve cavity (10), characterized in that, Also includes: The valve cover assembly (2) is sealed to the upper opening of the valve body (1), and a first receiving cavity (21) is formed at its lower part. The opening of the first receiving cavity (21) faces the outlet channel (12). The valve core (3) is slidably fitted in the first receiving cavity (21), and a first sealing structure (31) is provided between its peripheral wall and the inner wall of the first receiving cavity (21). A first elastic element (32) is connected between the valve core (3) and the top wall of the first receiving cavity (21) for pressure cooperation with the valve cavity to drive the valve core (3) to close or open the outlet channel (12). The second receiving cavity (22) is located inside the valve cover assembly (2) and above the first receiving cavity (21). Its bottom wall is provided with a first flow channel (221) connecting the valve cavity (10) and a second flow channel (222) connecting the first receiving cavity (21). The top is provided with a pressure relief port (223). The pressure relief valve core assembly (4) includes a main core (41) and a secondary core (42). The main core (41) is vertically slidably installed in the second receiving cavity (22) and connected to the bottom wall of the second receiving cavity (22) by a second elastic element (43). The secondary core (42) is slidably embedded in the first sliding groove (411) at the bottom of the main core (41). A vertical third elastic element (44) is provided between the main core (41) and the secondary core (42). The main core (41) extends upward to form a first control rod (412), and the secondary core (42) extends upward to form a second control rod (421). The pressure relief valve core assembly (4) has a pressure relief gap (226) between it and the side wall of the second receiving cavity (22). The pressure relief control mechanism (5), linked with the first control lever (412) and the second control lever (421), is used for step-by-step control of the container valve: When it is turned on: first drive the sub-core (42) to move down to block the first flow channel (221), then drive the main core (41) to move down to open the pressure relief port (223); When closed: first drive the main core (41) to move upward to block the pressure relief port (223), then drive the auxiliary core (42) to move upward to open the first flow channel (221). The pressure relief control mechanism (5) includes: Rotatable support shaft (51); The first disc cam (52) and the second disc cam (53), which are fixed on the support shaft (51), are in contact with the first control lever (412) and the second control lever (421), respectively. Transmission mechanism (54) is used to drive the support shaft (51) to rotate in both directions; The first disc cam (52) has a first smooth section (521) and a first pressing section (522); The second disc cam (53) has a second pressing section (531) and a second smoothing section (532).

2. The container valve according to claim 1, characterized in that: The valve cavity (10) is provided with a first flange (13) surrounding the outlet channel (12), and the lower end of the valve core (3) extends outward beyond the first flange (13) to form a pressure bearing surface (33).

3. The container valve according to claim 1, characterized in that: Opening sequence: When the support shaft (51) rotates forward, the second pressing section (531) drives the sub-core (42) to move down and block the first flow channel (221), while the first stable section (521) keeps the main core (41) blocking the pressure relief port (223). Then the second stable section (532) keeps the sub-core (42) blocking the first flow channel (221), while the first pressing section (522) drives the main core (41) to move down and open the pressure relief port (223). Closing sequence: When the support shaft (51) reverses, the first pressing section (522) and the second elastic element (43) drive the main core (41) to move upward to block the pressure relief port (223), while the second smoothing section (532) keeps the secondary core (42) blocking the first flow channel (221). Subsequently, the second pressing section (531) and the third elastic element (44) drive the secondary core (42) to move upward to open the first flow channel (221), while the first smoothing section (521) keeps the main core (41) blocking the pressure relief port (223).

4. The container valve according to claim 1, characterized in that: The transmission mechanism (54) includes a transmission gear (541) fixedly connected to the support shaft (51) and a transmission rack (542) meshing with the drive gear (541).

5. The container valve according to claim 1, characterized in that: The first control rod (412) is provided with an axial cavity (4121), and a second slide groove (413) is provided above the first slide groove (411) and is located in the main core (41). The second control rod (421) of the sub-core (42) extends out through the first slide groove (411), the second slide groove (413) and the axial cavity (4121) in sequence.

6. The container valve according to claim 1, characterized in that: The pressure relief port (223) is provided with a second flange (224) around it, and the upper end of the main core (41) is fitted with a second sealing gasket (414) that seals with the second flange (224). The first flow channel (221) in the second receiving cavity (22) is provided with a third flange (225) surrounding it, and the lower end of the sub-core (42) is embedded with a third sealing gasket (422) that seals with the third flange (225).

7. The container valve according to claim 1, characterized in that: The first elastic element (32), the second elastic element (43) and the third elastic element (44) are all configured as spring elements, and the axis of the spring element is arranged coaxially with the movement direction of the corresponding core.

8. The container valve according to claim 1, characterized in that: The second receiving cavity (22) has at least one guide groove extending vertically on its side wall. The main core (41) has a guide slider (415) fixedly connected to its side wall. The guide slider (415) is slidably fitted into the guide groove to constrain the circumferential rotation of the main core (41) and limit its axial movement trajectory.

9. A fire extinguishing system, comprising a fire extinguisher tank, characterized in that: The outlet of the fire extinguisher tank is equipped with a container valve as described in any one of claims 1-8.

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