Pressure reduction method for portable nitrogen fire extinguisher

Abstract

The invention discloses a pressure reduction method for a portable nitrogen fire extinguisher, and belongs to the technical field of fire extinguishers. The pressure reduction method comprises the following steps that S1, an operator checks whether the pressure of nitrogen in a fire extinguisher body is in a normal working state or not; s2, after the operator confirms that the state of the fire extinguisher is normal, the safety pin is pulled up, the fire extinguisher is stably held by one hand, it is ensured that the hand position of the operator is comfortable and stable, and the fire extinguisher can be flexibly operated in the fire extinguishing process; s3, an operator accurately controls the injection pressure and the injection distance of nitrogen by adjusting a valve assembly according to the type and the size of a fire source; the multi-layer throttling orifice plate is arranged, so that the gas flowing resistance is remarkably increased, the energy of nitrogen is further consumed, high-pressure gas impact can be effectively inhibited, the spraying pressure at the nozzle is accurately adjusted, the spraying counter-acting force is prevented from being too large, an operator can more stably hold the fire extinguisher, and the safety and reliability of fire extinguishing operation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishers, and particularly to a pressure reduction method for a portable nitrogen fire extinguisher. Background Art

[0002] Currently, there is a rich variety of portable fire extinguishers on the market. Different types of fire extinguishers have their own characteristics in terms of fire extinguishing principles and usage methods, but there are certain limitations. Taking the common portable carbon dioxide fire extinguisher as an example, its fire extinguishing principle is to use the pressure generated by the vaporization of liquid carbon dioxide to eject the fire extinguishing agent, and achieve fire extinguishing by reducing the oxygen concentration in the combustion area and absorbing heat.

[0003] However, in the actual use process, for fire extinguishers that store the fire extinguishing agent under high pressure, accurately controlling the injection pressure is a major problem. The existing control methods are difficult to meet the diverse requirements of injection pressure for different fire scenarios. Using a simple valve control method, during actual fire extinguishing operations, it is impossible to flexibly adjust the injection pressure according to factors such as the size of the fire source, the intensity of the fire, and the distance from the fire source, resulting in poor fire extinguishing effects. Moreover, when liquid carbon dioxide vaporizes, it absorbs a large amount of heat, resulting in local low-temperature phenomena in the nozzle and surrounding areas of the fire extinguisher. This not only poses a risk of frostbite to the operator but also may affect the normal use of the fire extinguisher, such as causing the valve to freeze, the nozzle to become brittle, etc., affecting the use effect and safety. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and a pressure reduction method for a portable nitrogen fire extinguisher is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A pressure reduction method for a portable nitrogen fire extinguisher includes the following steps:

[0007] S1: The operator checks whether the nitrogen pressure in the fire extinguisher body is in a normal working state;

[0008] S2: After the operator confirms that the fire extinguisher is in a normal state, pull out the safety pin, and firmly hold the fire extinguisher with one hand, ensuring that the position of the hand is comfortable and stable, so as to be able to operate the fire extinguisher flexibly during the fire extinguishing process;

[0009] S3: According to the type and size of the fire source, the operator precisely controls the injection pressure and injection distance of nitrogen by adjusting the valve assembly to meet the fire extinguishing requirements of different fire intensities. By adjusting the pressure and flow rate of nitrogen using the valve assembly, the nitrogen pressure is reduced and the flow rate is precisely adjusted;

[0010] S4: The operator aims the nozzle at the root of the fire source and adjusts the spraying angle and distance according to the size of the fire source, the intensity of the fire, and the distance from the fire source.

[0011] S5: After the operator finishes extinguishing the fire, turn off the fire extinguisher, put the fire extinguisher back to the designated position, and check it.

[0012] Preferably, the fire extinguisher body includes a storage tank, a valve assembly, a handle, a connecting hose, and a nozzle. The valve assembly is fixedly arranged on the upper side of the storage tank. An inlet communicating with the storage tank is opened at the bottom of the valve assembly. An outlet is opened on the upper side of the valve assembly. The outlet is communicated with the connecting hose. The nozzle is connected to one end of the connecting hose far away from the storage tank. The handle is fixedly arranged on the top of the valve assembly.

[0013] Preferably, the valve assembly includes a valve body, an adjusting part arranged in the valve body for adjusting the nitrogen pressure and flow rate, and a driving part arranged outside the valve body for driving the adjusting part to act. The inlet and the outlet are respectively arranged at both ends of the valve body. A lower cavity communicating with the inlet is opened on the valve body. An upper cavity communicating with the outlet is opened on the valve body. A communication groove is opened on the valve body between the upper cavity and the lower cavity.

[0014] Preferably, the adjusting part includes an adjusting pipe slidably connected to the valve body. The adjusting pipe is sequentially provided with a first throttle orifice plate, a second throttle orifice plate, a third throttle orifice plate, and a valve block from top to bottom. Air holes are opened on the first throttle orifice plate, the second throttle orifice plate, and the third throttle orifice plate. The pore diameters of the air holes on the first throttle orifice plate, the second throttle orifice plate, and the third throttle orifice plate gradually decrease in sequence. The diameters of the first throttle orifice plate, the second throttle orifice plate, the third throttle orifice plate, and the valve block are all the same as the pore diameter of the communication groove.

[0015] Preferably, the driving part includes a housing fixedly arranged on the top of the valve body. A fixed rod is fixedly connected in the housing. One end of the fixed rod far away from the inner wall of the housing passes through the valve body and extends into the adjusting pipe. A first elastic element is sleeved outside the fixed rod. One end of the first elastic element is fixedly connected to the inner wall of the housing. The end of the first elastic element far away from the inner wall of the housing is connected with an annular plate rotatably connected to the top of the adjusting pipe. A spiral groove is opened on the fixed rod. A positioning rod matched with the spiral groove is opened on the inner side wall of the adjusting pipe.

[0016] Preferably, positioning holes are opened on both the adjusting pipe and the fixed rod. The safety pin is movably connected between the two positioning holes. The adjusting pipe includes a rotating pipe and a sliding pipe which are rotatably connected to each other. The positioning rod is fixedly connected to the rotating pipe. The sliding pipe is slidably connected to the valve body. A sealing telescopic pipe is fixedly arranged between the sliding pipe and the inner wall of the valve body. The sealing telescopic pipe is sleeved outside the sliding pipe.

[0017] Preferably, a triangular seat is fixedly provided on the outer side of the shell, a triangular track groove is opened on the triangular seat, the triangular track groove is opened with concave holes connected with the inside of the shell at three corners, a limiting groove is opened on the inner side wall of the triangular track groove, a slider is movably connected in the limiting groove, a push rod plugged into the concave hole is slidably connected to the slider, a second elastic element is sleeved on the push rod, two ends of the second elastic element are respectively connected with the end of the push rod and the outer wall of the slider, and a toggle plate that movably abuts against the end of the push rod is fixed on the adjusting tube.

[0018] Preferably, the valve body is provided with a main throttling orifice plate at the material inlet, and the valve body is provided with a secondary throttling orifice plate at the material outlet.

[0019] Preferably, the valve body includes a main seat body and a lower seat body and an upper seat body arranged at both ends of the main seat body, the lower seat body and the upper seat body are both threadedly connected to the main seat body, the main throttling orifice plate is placed between the lower seat body and the main seat body, the auxiliary throttling orifice plate is placed between the upper seat body and the main seat body, and sealing gaskets are provided on the lower seat body and the upper seat body.

[0020] Preferably, a pressure gauge is fixedly provided on the outside of the valve body, and the pressure gauge is connected to a pressure sensor placed in the storage tank through wiring.

[0021] Compared with the prior art, the present invention provides a portable nitrogen fire extinguisher decompression method, which has the following features:

[0022] Beneficial effects:

[0023] 1. The portable nitrogen fire extinguisher decompression method significantly increases the resistance to gas flow by setting up a multi-layer throttling orifice plate, further consumes the energy of nitrogen, can effectively suppress the impact of high-pressure gas, accurately adjust the spray pressure at the nozzle, prevent the spray reaction force from being too large, and enable the operator to hold the fire extinguisher more stably, thereby improving the safety and reliability of the fire extinguishing operation.

[0024] 2. The portable nitrogen fire extinguisher decompression method uses a driving part to drive the adjusting part to achieve height adjustment of the first throttling orifice plate, the second throttling orifice plate, the third throttling orifice plate and the valve block, thereby achieving different degrees of pressure reduction and flow limiting of high-pressure nitrogen, and replacing the need for the pressing force of the pliers handle. There is no need to adjust the valve opening and closing in the way of pressing the pliers handle on a traditional fire extinguisher, thereby avoiding the different degrees of valve opening and closing due to the inability of the hand to continuously apply the same force to the pliers handle in actual application, resulting in unstable displacement between multiple layers of throttling orifices, affecting the continuous, stable and effective discharge of nitrogen during fire extinguishing.

[0025] 3. The portable nitrogen fire extinguisher decompression method reduces the pressure bearing capacity of the connecting hose by setting a secondary throttling orifice plate. It can fine-tune the nitrogen after throttling by the valve assembly. The main throttling orifice plate can be set to initially reduce the pressure of the high-pressure nitrogen in the storage tank and reduce the pressure bearing capacity of the valve assembly. The throttling orifices at different parts have clear division of labor. The multiple throttling orifices on the regulating pipe are responsible for the overall pressure reduction fine adjustment, the throttling orifice at the outlet is responsible for fine adjustment and pressure stability, and the throttling orifice at the inlet is responsible for initial pressure reduction, which together ensure the stability and reliability of the fire extinguisher injection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the fire extinguisher body of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the valve assembly of the present invention;

[0028] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the middle part A;

[0029] Figure 4 It is a schematic cross-sectional structure diagram of the valve body of the present invention;

[0030] Figure 5 For the present invention Figure 4 The enlarged structural diagram of the middle B part;

[0031] Figure 6 For the present invention Figure 4 The enlarged structural diagram of the middle C part;

[0032] Figure 7 It is a schematic diagram of the cross-sectional structure of the housing of the present invention;

[0033] Figure 8 It is a schematic diagram of the cross-sectional structure of the rotating tube of the present invention.

[0034] In the figure: 1. Fire extinguisher body; 101. Storage tank; 102. Valve assembly; 1021. Inlet; 1022. Outlet; 103. Handle; 104. Connecting hose; 105. Nozzle; 2. Safety pin; 3. Valve body; 301. Lower cavity; 302. Upper cavity; 303. Communication groove; 4. Adjusting pipe; 401. First orifice plate; 402. Second orifice plate; 403. Third orifice plate; 404. Valve block; 405. Positioning rod; 406. Dialing plate; 5. Outer shell; 501. Fixed rod; 5011. Spiral groove; 502. First elastic element; 503. Annular plate; 6. Positioning hole; 7. Triangular seat; 701. Triangular track groove; 702. Concave hole; 8. Limit groove; 801. Slide block; 802. Push rod; 803. Second elastic element; 9. Main orifice plate; 10. Auxiliary orifice plate; 11. Main seat body; 111. Lower seat body; 112. Upper seat body; 113. Sealing gasket; 12. Pressure gauge; 13. Rotating pipe; 14. Sliding pipe; 141. Sealing telescopic pipe. Detailed implementation mode

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements; for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Example: Refer to Figure 1 and Figure 2, A method for reducing the pressure of a portable nitrogen fire extinguisher, comprising the following steps:

[0039] S1: The operator checks whether the nitrogen pressure in the fire extinguisher body 1 is in a normal working state;

[0040] S2: After the operator confirms that the fire extinguisher is in a normal state, pull out the safety pin 2, and firmly hold the fire extinguisher with one hand to ensure that the position of the hand is comfortable and stable, so as to be able to operate the fire extinguisher flexibly during the fire extinguishing process;

[0041] S3: According to the type and size of the fire source, the operator precisely controls the injection pressure and injection distance of nitrogen by adjusting the valve assembly 102 to meet the fire extinguishing requirements of different fire intensities. By adjusting the pressure and flow rate of nitrogen using the valve assembly 102, the nitrogen pressure is reduced and the flow rate is precisely adjusted;

[0042] S4: The operator aims the nozzle 105 at the root of the fire source and adjusts the injection angle and distance according to the size of the fire source, the intensity of the fire, and the distance from the fire source;

[0043] S5: After the operator finishes extinguishing the fire, turn off the fire extinguisher, put the fire extinguisher back to the designated position, and check it.

[0044] Referring to Figure 1 and Figure 2 , As a preferred technical solution of the present invention, the fire extinguisher body 1 includes a storage tank 101, a valve assembly 102, a handle 103, a connecting hose 104, and a nozzle 105. The valve assembly 102 is fixedly arranged on the upper side of the storage tank 101. An inlet 1021 communicating with the storage tank 101 is opened at the bottom of the valve assembly 102, and an outlet 1022 is opened on the upper side of the valve assembly 102. The outlet 1022 is communicated with the connecting hose 104. The nozzle 105 is connected to one end of the connecting hose 104 away from the storage tank 101, and the handle 103 is fixedly arranged on the top of the valve assembly 102.

[0045] Specifically, the storage tank 101 is made of high-pressure resistant alloy steel. A handle 103 is firmly installed above the valve assembly 102 through bolts to form an integral stable structure, ensuring stable holding and no separation risk during the operation process. The connecting hose 104 is made of high-pressure resistant stainless steel corrugated material, and the nozzle 105 is fixedly installed at the end through bolts. The valve assembly 102 is integrated at the outlet of the storage tank 101. Through the combination of these components and their functions, the fire extinguisher body 1 has the following characteristics: the fire extinguisher is small and flexible, has a compact and stable structure, is easy to operate, has strong adaptability; its structure is easy to maintain.

[0046] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 ,Figure 5 , Figure 6 , Figure 7 and Figure 8 , as a preferred technical solution of the present invention, the valve assembly 102 includes a valve body 3, an adjusting part arranged in the valve body 3 for adjusting the nitrogen pressure and flow rate, and a driving part arranged outside the valve body 3 for driving the adjusting part to act. The feeding port 1021 and the discharging port 1022 are respectively arranged at both ends of the valve body 3. A lower cavity 301 communicating with the feeding port 1021 and an upper cavity 302 communicating with the discharging port 1022 are formed on the valve body 3. A communicating groove 303 is formed in the valve body 3 between the upper cavity 302 and the lower cavity 301.

[0047] Furthermore, the adjusting part includes an adjusting pipe 4 slidably connected to the valve body 3. The adjusting pipe 4 is successively provided with a first throttle orifice plate 401, a second throttle orifice plate 402, a third throttle orifice plate 403 and a valve block 404 from top to bottom. Air holes are formed on the first throttle orifice plate 401, the second throttle orifice plate 402 and the third throttle orifice plate 403. The pore diameters of the air holes on the first throttle orifice plate 401, the second throttle orifice plate 402 and the third throttle orifice plate 403 gradually decrease in sequence. The diameters of the first throttle orifice plate 401, the second throttle orifice plate 402, the third throttle orifice plate 403 and the valve block 404 are all the same as the pore diameter of the communicating groove 303.

[0048] Furthermore, the driving part includes a housing 5 fixedly arranged on the top of the valve body 3. A fixed rod 501 is fixedly connected inside the housing 5. One end of the fixed rod 501 away from the inner wall of the housing 5 passes through the valve body 3 and extends into the adjusting pipe 4. A first elastic element 502 is sleeved outside the fixed rod 501. One end of the first elastic element 502 is fixedly connected to the inner wall of the housing 5. The end of the first elastic element 502 away from the inner wall of the housing 5 is connected with an annular plate 503 rotatably connected to the top of the adjusting pipe 4. A spiral groove 5011 is formed on the fixed rod 501. A positioning rod 405 matched with the spiral groove 5011 is formed on the inner side wall of the adjusting pipe 4.

[0049] Furthermore, positioning holes 6 are formed on both the adjusting pipe 4 and the fixed rod 501. The safety pin 2 is movably connected between the two positioning holes 6. The adjusting pipe 4 includes a rotating pipe 13 and a sliding pipe 14 which are rotatably connected to each other. The positioning rod 405 is fixedly connected to the rotating pipe 13. The sliding pipe 14 is slidably connected to the valve body 3. A sealing telescopic pipe 141 is fixedly arranged between the sliding pipe 14 and the inner wall of the valve body 3. The sealing telescopic pipe 141 is sleeved outside the sliding pipe 14.

[0050] Furthermore, a triangular seat 7 is fixedly provided on the outer side of the shell 5, and a triangular track groove 701 is opened on the triangular seat 7. The triangular track groove 701 is provided with concave holes 702 connected with the inside of the shell 5 at three corners. A limiting groove 8 is opened on the inner wall of the triangular track groove 701. A slider 801 is movably connected in the limiting groove 8. A push rod 802 inserted into the concave hole 702 is slidably connected to the slider 801. A second elastic element 803 is sleeved on the push rod 802. The two ends of the second elastic element 803 are respectively connected to the end of the push rod 802 and the outer wall of the slider 801. A toggle plate 406 that movably abuts against the end of the push rod 802 is fixed on the adjusting tube 4.

[0051] Specifically, when the fire extinguisher body 1 is not in use, the safety pin 2 is inserted into the positioning hole 6 of the regulating tube 4 and the fixing rod 501 to position the regulating tube 4, and at this time, the valve block 404 is placed in the connecting groove 303 to block the lower side of the valve body 3, and one end of the push rod 802 is in the triangular track groove 701 and does not pass through the concave hole 702; when the fire extinguisher body 1 needs to be used to extinguish a fire, the safety pin 2 is first pulled out of the positioning hole 6 to release the restriction on the regulating tube 4, and then the staff moves the push rod 802 according to the type and size of the fire source, so that the push rod 802 drives the slider 801 to slide along the triangular track groove 701, so that the push rod 802 directly moves to the first gear, the second gear or the third gear. When it moves to the first gear, the push rod 802 is placed in the concave hole 702 on the left side of the lower side of the triangular seat 7. At this time, the push rod 802 is farthest from the fixed rod 501 in a straight line. The push rod 802 passes through the concave hole 702 and pushes the toggle plate 406 on the outer side of the regulating tube 4. The toggle plate 406 drives the rotating tube 13 of the regulating tube 4 to rotate relative to the fixed rod 501. Under the cooperation of the positioning rod 405 and the spiral groove 5011, the rotating tube 13 rotates and drives the sliding tube 14 to move downward. At this time, the sliding tube 14 drives the third throttling orifice plate 403 to be placed in the connecting groove 303; when the push rod 802 is placed in the concave hole 702, the push rod 802 is placed in the concave hole 702 and pushes the toggle plate 406 on the outer side of the regulating tube 4. The toggle plate 406 drives the rotating tube 13 of the regulating tube 4 to rotate relative to the fixed rod 501. Under the cooperation of the positioning rod 405 and the spiral groove 5011, the rotating tube 13 rotates and drives the sliding tube 14 to move downward. At this time, the sliding tube 14 drives the third throttling orifice plate 403 to be placed in the connecting groove 303. When the concave hole 702 on the upper side of the triangular seat 7 is in position, the push rod 802 pushes the toggle plate 406 to a greater deflection angle, and at this time the slide tube 14 drives the second throttling orifice plate 402 to be placed in the connecting groove 303; when the push rod 802 is in position of the concave hole 702 on the lower side of the triangular seat 7, the push rod 802 pushes the toggle plate 406 to a maximum deflection angle, and at this time the slide tube 14 drives the first throttling orifice plate 401 to be placed in the connecting groove 303, and the apertures of the first throttling orifice plate 401, the second throttling orifice plate 402 and the third throttling orifice plate 403 gradually increase, and the nitrogen passes through the third throttling orifice plate 403, the second throttling orifice plate 402 and the first throttling orifice plate 401 in sequence. When the pressure is gradually reduced, the flow rate is further precisely adjusted. Each time a layer of throttling orifice plate is passed, the energy of the nitrogen is further consumed. The multi-layer throttling orifice plates are assembled by precise positioning and connection to ensure that the spacing between the layers is uniform. The nitrogen can smoothly pass through the throttling holes of each layer in turn. The multi-layer throttling orifice plate structure significantly increases the resistance to gas flow, further consumes the energy of nitrogen, can effectively suppress the impact of high-pressure gas, accurately adjust the ejection pressure at the nozzle 105, prevent the ejection reaction force from being too large, and enable the operator to hold the fire extinguisher more stably, thereby improving the safety and reliability of the fire extinguishing operation.By controlling the nitrogen flow rate regulated by the valve assembly 102, the pressure and flow rate of the nitrogen are dynamically adjusted to ensure that the fire extinguishing agent is always sprayed onto the fire source in the best state to achieve efficient fire extinguishing. The regulating part is driven by the driving part to achieve the height adjustment of the first throttling orifice 401, the second throttling orifice 402, the third throttling orifice 403 and the valve block 404, so as to achieve different degrees of pressure reduction and flow limiting of high-pressure nitrogen, and replace the requirement for the pressing force of the clamp handle. It is not necessary to adjust the valve opening and closing in the way of pressing the clamp handle on the traditional fire extinguisher, so as to avoid different valve opening and closing degrees due to the inability of the hand to continuously apply the same force to the clamp handle in actual application, resulting in unstable displacement between the multi-layer throttling orifices, which affects the continuous, stable and effective discharge of nitrogen during fire extinguishing. It should be noted that the sealing telescopic tube 141 can block and seal the connection between the slide tube 14 and the valve body 3 to avoid gas leakage at the connection between the slide tube 14 and the valve body 3. ;

[0052] Reference Figure 4 and Figure 6 As a preferred technical solution of the present invention, the valve body 3 is provided with a main throttling orifice plate 9 at the inlet 1021 , and the valve body 3 is provided with a secondary throttling orifice plate 10 at the outlet 1022 .

[0053] Furthermore, the valve body 3 includes a main seat body 11 and a lower seat body 111 and an upper seat body 112 arranged at both ends of the main seat body 11, the lower seat body 111 and the upper seat body 112 are both threadedly connected to the main seat body 11, the main throttling orifice plate 9 is placed between the lower seat body 111 and the main seat body 11, the auxiliary throttling orifice plate 10 is placed between the upper seat body 112 and the main seat body 11, and sealing gaskets 113 are provided on the lower seat body 111 and the upper seat body 112.

[0054] Specifically, by setting the auxiliary throttling orifice 10, the pressure bearing capacity of the connecting hose 104 is reduced, and it can fine-tune the nitrogen after throttling through the valve assembly 102 again. The main throttling orifice 9 can be set to initially reduce the pressure of the high-pressure nitrogen in the storage tank 101 and reduce the pressure bearing capacity of the valve assembly 102. The throttling orifices at different parts have clear division of labor. The multiple throttling orifices on the regulating tube 4 are responsible for the overall pressure reduction fine adjustment, the auxiliary throttling orifice 10 at the outlet is responsible for fine adjustment and pressure stability, and the main throttling orifice 9 at the inlet is responsible for initial pressure reduction, which jointly ensure the stability and reliability of the fire extinguisher injection system; the valve body 3 is composed of three parts, which is convenient for the installation of the main throttling orifice 9 and the auxiliary throttling orifice 10, and a sealing gasket 113 is set at the connection to ensure the good sealing performance of the valve body 3.

[0055] Reference Figure 1 As a preferred technical solution of the present invention, a pressure gauge 12 is fixedly provided on the outside of the valve body 3, and the pressure gauge 12 is connected to a pressure sensor placed in the storage tank 101 through wiring.

[0056] Specifically, the pressure sensor is embedded in the inner wall of the storage tank 101 to monitor the change of nitrogen pressure in the tank in real time. The signal is transmitted to the pressure gauge 12 through a wire. The pressure gauge 12 is installed at the side end of the valve body 3 and has the functions of low-pressure and over-pressure acoustic and optical alarms to intelligently detect the nitrogen pressure in the storage tank 101.

[0057] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A pressure reduction method for a portable nitrogen fire extinguisher, characterized in that, It includes the following steps: S1: The operator checks whether the nitrogen pressure in the fire extinguisher body (1) is in a normal working state; S2: After the operator confirms that the fire extinguisher is in a normal state, pull out the safety pin (2), and firmly hold the fire extinguisher with one hand to ensure that the hand position is comfortable and stable, so that the fire extinguisher can be operated flexibly during the fire extinguishing process; S3: According to the type and size of the fire source, the operator precisely controls the injection pressure and injection distance of nitrogen by adjusting the valve assembly (102) to meet the fire extinguishing requirements of different fire intensities. By adjusting the pressure and flow rate of nitrogen using the valve assembly (102), the nitrogen pressure is reduced and the flow rate is precisely adjusted; S4: The operator aims the nozzle (105) at the root of the fire source and adjusts the injection angle and distance according to the size of the fire source, the intensity of the fire, and the distance from the fire source; S5: After the operator finishes extinguishing the fire, turn off the fire extinguisher, put the fire extinguisher back to the designated position, and check it.

2. The decompression method of a portable nitrogen fire extinguisher according to claim 1, characterized in that, The fire extinguisher body (1) includes a storage tank (101), a valve assembly (102), a handle (103), a connecting hose (104), and a nozzle (105). The valve assembly (102) is fixedly arranged on the upper side of the storage tank (101). An inlet (1021) communicating with the storage tank (101) is opened at the bottom of the valve assembly (102), an outlet (1022) is opened at the upper side of the valve assembly (102), the outlet (1022) is communicated with the connecting hose (104), the nozzle (105) is connected to one end of the connecting hose (104) far away from the storage tank (101), and the handle (103) is fixedly arranged on the top of the valve assembly (102).

3. A decompression method for a portable nitrogen fire extinguisher according to claim 2, characterized in that, The valve assembly (102) includes a valve body (3), an adjusting part arranged in the valve body (3) for adjusting the nitrogen pressure and flow rate, and a driving part arranged outside the valve body (3) for driving the adjusting part to act. The inlet (1021) and the outlet (1022) are respectively arranged at both ends of the valve body (3). A lower cavity (301) communicating with the inlet (1021) and an upper cavity (302) communicating with the outlet (1022) are opened on the valve body (3). A communication groove (303) is opened on the valve body (3) between the upper cavity (302) and the lower cavity (301).

4. A decompression method for a portable nitrogen fire extinguisher according to claim 3, characterized in that, The regulating part comprises a regulating tube (4) slidably connected to the valve body (3); the regulating tube (4) is provided with a first throttling orifice plate (401), a second throttling orifice plate (402), a third throttling orifice plate (403) and a valve block (404) in sequence from top to bottom; the first throttling orifice plate (401), the second throttling orifice plate (402) and the third throttling orifice plate (403) are all provided with air holes; the air hole diameters of the first throttling orifice plate (401), the second throttling orifice plate (402) and the third throttling orifice plate (403) are gradually reduced in sequence; the diameters of the first throttling orifice plate (401), the second throttling orifice plate (402), the third throttling orifice plate (403) and the valve block (404) are all the same as the hole diameter of the connecting groove (303).

5. A decompression method for a portable nitrogen fire extinguisher according to claim 4, characterized in that, The driving part comprises a shell (5) fixedly mounted on the top of the valve body (3), a fixing rod (501) being fixedly connected inside the shell (5), an end of the fixing rod (501) away from the inner wall of the shell (5) passing through the valve body (3) and extending into the regulating tube (4), a first elastic element (502) being sleeved on the outer side of the fixing rod (501), one end of the first elastic element (502) being fixedly connected to the inner wall of the shell (5), an end of the first elastic element (502) away from the inner wall of the shell (5) being connected to an annular plate (503) rotatably connected to the top of the regulating tube (4), a spiral groove (5011) being provided on the fixing rod (501), and a positioning rod (405) matching the spiral groove (5011) being provided on the inner wall of the regulating tube (4).

6. A method for decompressing a portable nitrogen fire extinguisher according to claim 5, characterized in that, The regulating tube (4) and the fixing rod (501) are both provided with positioning holes (6), the safety pin (2) is movably connected between the two positioning holes (6), the regulating tube (4) comprises a rotating tube (13) and a sliding tube (14) which are rotatably connected to each other, the positioning rod (405) is fixedly connected to the rotating tube (13), the sliding tube (14) is slidably connected to the valve body (3), a sealing telescopic tube (141) is fixedly provided between the sliding tube (14) and the inner wall of the valve body (3), and the sealing telescopic tube (141) is sleeved on the outer side of the sliding tube (14).

7. A method for decompressing a portable nitrogen fire extinguisher according to claim 6, characterized in that A triangular seat (7) is fixedly provided on the outer side of the shell (5), and a triangular track groove (701) is provided on the triangular seat (7). The triangular track groove (701) is provided with concave holes (702) connected to the inside of the shell (5) at three corners. A limiting groove (8) is provided on the inner side wall of the triangular track groove (701). A slider (801) is movably connected in the limiting groove (8). A push rod (802) plugged into the concave hole (702) is slidably connected to the slider (801). A second elastic element (803) is sleeved on the push rod (802), and two ends of the second elastic element (803) are respectively connected to the end of the push rod (802) and the outer wall of the slider (801). A toggle plate (406) movably abuts against the end of the push rod (802) is fixedly provided on the regulating tube (4).

8. A decompression method for a portable nitrogen fire extinguisher according to claim 7, characterized in that, The valve body (3) is provided with a main throttle orifice plate (9) at the inlet (1021), and the valve body (3) is provided with a secondary throttle orifice plate (10) at the outlet (1022).

9. A method for reducing the pressure of a portable nitrogen fire extinguisher according to claim 8, characterized in that, The valve body (3) includes a main seat body (11) and a lower seat body (111) and an upper seat body (112) provided at both ends of the main seat body (11). The lower seat body (111) and the upper seat body (112) are both threadedly connected to the main seat body (11). The main throttle orifice plate (9) is placed between the lower seat body (111) and the main seat body (11), and the secondary throttle orifice plate (10) is placed between the upper seat body (112) and the main seat body (11). Sealing gaskets (113) are provided on both the lower seat body (111) and the upper seat body (112).

10. A decompression method for a portable nitrogen fire extinguisher according to claim 9, characterized in that, A pressure gauge (12) is fixedly provided on the outside of the valve body (3), and the pressure gauge (12) is connected by wiring to a pressure sensor placed inside the storage tank (101).

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