High-pressure water mist spray gun and backpack fire extinguisher with same

Abstract

The utility model relates to the technical field of forestry fire extinguishing devices, in particular to a high-pressure water mist spray gun and a backpack fire extinguisher with the high-pressure water mist spray gun. The utility model aims to solve the problems of large water consumption, poor portability, insufficient output jet intensity and the like of the existing small fire extinguisher for forests. The high-pressure water mist spray gun comprises a spray gun body and a water inlet pipeline, the spray gun body comprises a ducted fan, a Laval spray pipe, a mixed flow spray pipe and an atomizing nozzle, an air outlet of the ducted fan is communicated with an air inlet of the Laval spray pipe, and an air outlet of the Laval spray pipe is communicated with an air inlet of the mixed flow spray pipe. The atomizing nozzle is arranged on the inner side of the mixed flow spray pipe through a nozzle mounting frame; the mixed flow spray pipe is further provided with a through hole, and the water inlet pipeline is communicated with the atomizing nozzle through the through hole. The second purpose is to provide a backpack fire extinguisher which comprises a backpack water tank assembly and the high-pressure water mist spray gun.

Description

Technical Field

[0001] The utility model relates to the technical field of forestry fire extinguishing devices, and more specifically, to a high-pressure fine water mist spray gun and a backpack fire extinguisher equipped with the same. Background Art

[0002] For low-intensity forest fire fighting scenarios such as surface fires in the initial stage of forests and residual fire cleaning, portable Feng Shui dual-purpose fire extinguishers with water spraying functions are usually used, such as the portable Feng Shui fire extinguisher powered by a turbojet engine disclosed in the utility model patent number CN210170708U. However, due to the limitations of the water pipe structure and the air duct structure, the existing Feng Shui fire extinguishers have insufficient spray intensity and large water consumption, so they often need to be equipped with a larger water tank, which makes it difficult to truly achieve portability. With the development of technology, backpack high-pressure fine water mist fire extinguishers have been widely used due to their advantages such as low water consumption and efficient cooling. However, the existing backpack high-pressure fine water mist fire extinguishers still have the limitation of short range. For this reason, the latest backpack high-pressure fine water mist fire extinguisher group standard has strengthened indicators in aspects such as horizontal range and maximum water output.

[0003] In response to the urgent need for lightweight forest fire fighting equipment, it is necessary to improve the existing backpack high-pressure water mist fire extinguisher, so as to achieve a longer continuous spraying working time or a larger maximum water output under the same machine load. Utility Model Content

[0004] The utility model aims to overcome at least one defect of the above-mentioned prior art and provide a high-pressure fine water mist spray gun and a backpack fire extinguisher equipped with the same, which are used to solve the problems of large water consumption, poor portability, insufficient output jet intensity, etc.

[0005] The first object of the utility model is to provide a high-pressure fine water mist spray gun, comprising a spray gun body and a water inlet pipe, the spray gun body comprising a ducted fan, a Laval nozzle, a mixed flow nozzle and an atomizing nozzle; the ducted fan, the Laval nozzle and the mixed flow nozzle are arranged in sequence along the axial direction of the spray gun body, the air outlet of the ducted fan is connected to the air inlet of the Laval nozzle, the air outlet of the Laval nozzle is connected to the air inlet of the mixed flow nozzle, the atomizing nozzle is mounted on the inner side of the mixed flow nozzle through a nozzle mounting; the mixed flow nozzle is also provided with a through hole, and the water inlet pipe is connected to the atomizing nozzle through the through hole.

[0006] When the high-pressure fine water mist spray gun of this scheme is working, the water inlet port of the water inlet pipe is connected to a water source with a certain output pressure, and the water flows through the atomizing nozzle at the front end to spray out the atomized water flow. At the same time, the duct fan helps to output the initial airflow with a large thrust. The initial airflow is accelerated to become a high-speed airflow after passing through the Laval nozzle. The high-speed airflow is input into the mixed flow nozzle and applied to the atomized water flow. The high-speed airflow and the atomized water flow collide and mix inside the mixed flow nozzle, and then are ejected at a high speed from the output port of the mixed flow nozzle. In this way, the purpose of efficiently extinguishing low-intensity forest fires can be achieved. In addition, since this scheme adopts an atomizing nozzle to output water flow, it can significantly reduce the water consumption per unit time, prolong the operation time under the same water supply, and is easy to match with a miniaturized water tank to improve portability.

[0007] Furthermore, the ratio of the cross-sectional area of ​​the air inlet of the Laval nozzle to the cross-sectional area of ​​the narrowest part of the Laval nozzle is 5:1-10:1.

[0008] The Laval nozzle gradually decreases from the air inlet to the middle until it shrinks into a narrow throat, and then gradually increases from the narrow throat to the air outlet. When the low-speed airflow flows into the Laval nozzle from the air inlet, the speed of the low-speed airflow is inversely proportional to the cross-sectional area of ​​the pipe flowing through it, so the airflow is accelerated in the first half of the Laval nozzle. As long as the airflow is accelerated to the speed of sound when passing through the narrow throat, the speed of the sonic or supersonic airflow is proportional to the cross-sectional area of ​​the pipe flowing through it, so the sonic airflow can be accelerated to supersonic speed after passing through the second half of the Laval nozzle. Based on the cross-sectional area ratio setting of this scheme, it is only necessary to match a conventional small duct fan to obtain a supersonic airflow at the air outlet of the Laval nozzle, so that after interacting with the atomized water flow sprayed from the atomizing nozzle, a high-speed mixed jet flow is ejected from the output port of the mixed flow nozzle, achieving the purpose of efficiently extinguishing low-intensity forest fires. This also helps to miniaturize the high-pressure fine water mist spray gun, and then obtain a portable fire extinguisher when combined with a miniaturized water tank.

[0009] Furthermore, the ducted fan is an all-metal ducted fan.

[0010] The metal ducted fan of this solution has good structural strength and can improve the stability of the operation process.

[0011] In this solution, a miniaturized ducted fan is sufficient to meet the above parameters and is convenient for providing supersonic airflow in combination with a Laval nozzle. It can provide a mixed jet flow of sufficient intensity while meeting the requirements of miniaturization and portability.

[0012] Furthermore, the duct fan is provided with a variable frequency switch for adjusting the output power.

[0013] In this solution, since the duct fan can achieve variable frequency operation, it helps operators optimize the output airflow according to the fire points at different distances, improve work efficiency and reduce work intensity.

[0014] Furthermore, the air inlet of the ducted fan is provided with a protective cover.

[0015] This solution uses a protective cover to prevent large foreign objects from entering the duct fan, thereby extending the service life, reducing risks during use, and improving operational stability and reliability.

[0016] Furthermore, the nozzle mounting bracket includes a nozzle mounting seat and a plurality of support rods, the nozzle mounting seat is located in the middle of the cross-section of the mixed flow nozzle, the outer ends of the support rods are supported on the inner surface of the mixed flow nozzle, and the inner ends of the support rods are connected to the nozzle mounting seat.

[0017] The support rod of the present solution is sufficient to provide stable support for the nozzle mounting seat. At the same time, there is a larger hollow space between the support rod structure and the cross section of the mixed flow nozzle, which facilitates the supersonic airflow output from the Laval nozzle outlet to act efficiently and smoothly on the atomized water flow output by the atomizing nozzle. In addition, since the nozzle mounting seat is located in the middle of the cross section of the mixed flow nozzle, the atomized water flow can be relatively evenly diffused to the surroundings after being affected by the supersonic airflow, which helps to output a more stable mixed jet flow and improve the fire extinguishing efficiency.

[0018] Furthermore, the cross section of the mixed flow nozzle is circular, the nozzle mounting seat is arranged at the center of the cross section of the mixed flow nozzle, and the outer ends of the support rods are evenly distributed around the cross section of the mixed flow nozzle.

[0019] Since the air outlet of the Laval nozzle is usually circular, the mixed flow nozzle of the present scheme is easy to be connected with the Laval nozzle. At the same time, the support rod of the present scheme can support and fix the nozzle mounting seat arranged at the center of the circle from all sides, thereby improving the installation strength of the nozzle mounting seat, so that the atomizing nozzle installed on the nozzle mounting seat can withstand the supersonic airflow output by the Laval tube, which helps the mixed flow nozzle to output a stable and high-speed mixed jet flow.

[0020] Furthermore, a handle component is provided, and the handle component is connected to the upper part of the spray gun body.

[0021] Preferably, the handle component includes a rear handle and a front handle, the rear handle is arranged on the upper surface of the ducted fan, and the front handle is arranged on the upper surface of the Laval nozzle.

[0022] Since the ducted fan and Laval nozzle are the main weight components, the rear handle and the front handle can help the operator stably control the high-pressure water mist spray gun and optimize the controllability.

[0023] Furthermore, an infrared detection component is provided, and the infrared detection component is installed on the spray gun body.

[0024] Preferably, the infrared detection assembly comprises an infrared probe and an infrared display screen, the infrared probe is arranged on the mixed flow nozzle, and the infrared display screen is hinged to the mixed flow nozzle.

[0025] Another object of the utility model is to provide a backpack fire extinguisher, comprising a backpack water tank assembly and the high-pressure fine water mist spray gun, wherein the backpack water tank assembly is provided with a water outlet pipe, and the water outlet pipe is used to connect the water inlet pipe.

[0026] Furthermore, the backpack water tank assembly includes a backpack water tank, an air supply component and a power supply component. The surface of the backpack water tank is concave to form an air supply component installation cavity and a power supply component installation cavity. A water outlet is provided at the lower portion of the backpack water tank. The water outlet, the air supply component and the water outlet pipe are connected through a three-way needle valve. The power supply component is provided with a power supply line, and the power supply line is used to be electrically connected to the ducted fan.

[0027] In this solution, the air supply component provides output pressure for the stored water in the backpack water tank, so that the stored water can output an atomized water flow with a certain initial velocity through the atomizing nozzle. The power supply component provided on the backpack water tank assembly provides power to the duct fan, thereby avoiding increasing the size and weight of the spray gun when the power supply component is provided on the spray gun body. This helps to improve the controllability of the high-pressure fine water mist spray gun and reduce the labor intensity of the operator.

[0028] Furthermore, a pressure reducing valve is provided between the air supply component and the three-way needle valve.

[0029] This solution makes it easy for operators to adjust the air supply pressure of the air supply component through the pressure reducing valve, thereby controlling the output state of the atomized water flow and the mixed jet flow.

[0030] Optionally, the gas supply component is a high-pressure gas cylinder.

[0031] Furthermore, the backpack water tank is provided with an ergonomic backrest.

[0032] Furthermore, the power supply component is a rechargeable lithium-ion power battery.

[0033] The lithium-ion power battery of this solution can provide higher energy density, reduce the weight and volume of the battery at the same power, and promote the miniaturization and portability of the backpack fire extinguisher.

[0034] Compared with the prior art, the utility model has the following beneficial effects: providing a battery-powered backpack high-pressure water mist fire extinguisher, which uses a relatively high energy density rechargeable lithium-ion power battery as a power drive, can reduce the design weight of the whole machine or achieve a larger water carrying capacity. In addition, based on the core structure of the spray gun of the Laval nozzle structure and the frequency conversion principle of the ducted fan, the dynamic optimization of the water mist spray distance can be achieved, the working efficiency of firefighting professionals can be improved, and the working intensity can be reduced. Through the coupling of the infrared emitting device and the infrared real-time display screen, intelligent remote monitoring of the fire extinguishing process can be achieved, the temperature of the fire scene can be sensed in real time and dynamically, and the safety of firefighting professionals can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The structure of the high pressure water mist spray gun of Example 1 Figure 1 .

[0036] Figure 2 The structure of the high pressure water mist spray gun of Example 1 Figure 2 .

[0037] Figure 3 This is a cross-sectional view of the high-pressure fine water mist spray gun of Example 1.

[0038] Figure 4 This is a partial structural diagram of the high-pressure fine water mist spray gun of Example 1.

[0039] Figure 5 The structure of the backpack fire extinguisher of Example 2 Figure 1 .

[0040] Figure 6 The structure of the backpack fire extinguisher of Example 2 Figure 2 .

[0041] Figure numerals: high-pressure fine water mist spray gun 100, water inlet pipe 110, duct fan 120, frequency conversion switch 121, Laval nozzle 130, narrow throat 131, mixed flow nozzle 140, through hole 141, atomizing nozzle 150, nozzle mounting bracket 160, nozzle mounting seat 161, support rod 162, protective cover 170, handle component 180, rear handle 181, front handle 182, infrared detection component 190, infrared probe 191, infrared display screen 192, backpack water tank assembly 200, backpack water tank 210, installation cavity 211, water outlet 212, sealing cover 213, air supply component 220, power supply component 230, three-way needle valve 240, power supply line 250, protective sleeve 260, pressure reducing valve 270, ergonomic backrest 280, water outlet pipe 290. DETAILED DESCRIPTION

[0042] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0043] Example 1

[0044] like Figure 1-4 As shown, this embodiment provides a high-pressure fine water mist spray gun, including a spray gun body and a water inlet pipe 110, the spray gun body includes a ducted fan 120, a Laval nozzle 130, a mixed flow nozzle 140 and an atomizing nozzle 150; the ducted fan 120, the Laval nozzle 130, and the mixed flow nozzle 140 are arranged in sequence along the axial direction of the spray gun body, the air outlet of the ducted fan 120 is connected to the air inlet of the Laval nozzle 130, the air outlet of the Laval nozzle 130 is connected to the air inlet of the mixed flow nozzle 140, and the atomizing nozzle 150 is arranged on the inner side of the mixed flow nozzle 140 through a nozzle mounting bracket 160; the mixed flow nozzle 140 is also provided with a through hole 141, and the water inlet pipe 110 is connected to the atomizing nozzle 150 through the through hole 141. During specific implementation, in order to avoid obstruction to the air flow inside the spray gun body, the water inlet pipe 110 is arranged on the outer surface of the spray gun body. Specifically, a metal pipe or other hard material pipe can be used. The water inlet pipe 110 and the surface of the spray gun body can be fixed by welding or other means to avoid violent shaking during the water supply process, so as to improve the stability of water delivery to the atomizing nozzle 150.

[0045] refer to Figure 2-3 , the working principle of the Laval nozzle 130 is explained: the Laval nozzle 130 gradually decreases from the air inlet to the middle until it shrinks into a narrow throat 131, and then gradually increases from the narrow throat 131 to the air outlet. When the low-speed airflow flows into the Laval nozzle 130 from the air inlet, the speed of the low-speed airflow is inversely proportional to the cross-sectional area of ​​the pipe flowing through it, so the airflow is accelerated in the first half of the Laval nozzle 130. As long as the airflow is accelerated to the speed of sound when passing through the narrow throat 131, since the speed of the sonic or supersonic airflow is proportional to the cross-sectional area of ​​the pipe flowing through it, the sonic airflow can be accelerated to the supersonic speed after flowing through the second half of the Laval nozzle 130.

[0046] like Figure 4As shown, in a specific implementation, the nozzle mounting bracket 160 includes a nozzle mounting seat 161 and a plurality of support rods 162. The nozzle mounting seat 161 is located in the middle of the cross section of the mixed flow nozzle 140. The outer ends of the support rods 162 are all supported and arranged on the inner surface of the mixed flow nozzle 140, and the inner ends of the support rods 162 are all connected to the nozzle mounting seat 161. It can be understood that the support rods 162 are sufficient to provide a stable support for the nozzle mounting seat 161. At the same time, there is a larger hollow space between the support rod 162 structure and the cross section of the mixed flow nozzle 140, which is convenient for the high-speed airflow output from the air outlet of the Laval nozzle 130 to act efficiently and smoothly on the atomized water flow output by the atomizing nozzle 150. In addition, since the nozzle mounting seat 161 is located in the middle of the cross section of the mixed flow nozzle 140, the atomized water flow can be relatively evenly diffused to the surroundings after being affected by the supersonic airflow, which is helpful to output a more stable mixed jet flow and improve the fire extinguishing efficiency. In order to improve the installation stability of the atomizing nozzle 150, the atomizing nozzle 150 and the nozzle mounting seat 161 can be connected by thread, so that it is easy to disassemble and replace the atomizing nozzle 150. Specifically, the atomizing nozzle 150 can select a 1-point 1B type spray hole with a size of 0.79 mm, and a solid cone nozzle is used to improve the structural strength.

[0047] Preferably, refer to Figure 1 , Figure 4 , the cross section of the mixed flow nozzle 140 is circular, the nozzle mounting seat 161 is arranged at the center of the cross section of the mixed flow nozzle 140, and the outer ends of the support rods 162 are evenly distributed in the circumference of the cross section of the mixed flow nozzle 140. It can be understood that since the air outlet of the Laval nozzle 130 is usually circular, the mixed flow nozzle 140 with a circular cross section is convenient for docking with the Laval nozzle 130. At the same time, the support rods 162 of this scheme can support and fix the nozzle mounting seat 161 arranged at the center of the circle from all sides, improve the installation strength of the nozzle mounting seat 161, so that the atomizing nozzle 150 installed on the nozzle mounting seat 161 is sufficient to withstand the high-speed airflow output by the Laval tube, which helps the mixed flow nozzle 140 to output a stable and high-speed mixed jet. Specifically, 6 support rods 162 are provided, and the outer ends of the 6 support rods 162 are evenly fixed along the inner surface of the mixed flow nozzle 140 by bolt connection, thereby forming a six-claw type stable support for the nozzle mounting seat 161.

[0048] During operation, the water inlet port of the water inlet pipe 110 can be connected to a water source with a certain output pressure, and the water flow is sprayed out as atomized water flow through the atomizing nozzle 150 at the front end. At the same time, the duct fan 120 helps to output an initial airflow with a large thrust. The initial airflow is accelerated to become a high-speed airflow after passing through the Laval nozzle 130. The high-speed airflow is input into the mixed flow nozzle 140 and applied to the atomized water flow. The high-speed airflow and the atomized water flow collide and mix inside the mixed flow nozzle 140 and then are ejected at a high speed from the output port of the mixed flow nozzle 140. In this way, the purpose of efficiently extinguishing low-intensity forest fires can be achieved. In addition, since the present solution adopts the atomizing nozzle 150 to output water flow, the water consumption per unit time can be significantly reduced, the operation time under the same water supply can be extended, and it is easy to match with a miniaturized water tank to improve portability.

[0049] In some embodiments, the ratio of the cross-sectional area of ​​the air inlet of the Laval nozzle 130 to the cross-sectional area of ​​the narrowest part of the Laval nozzle 130 is 5:1-10:1. Specifically, it can be set to 9:1. In this way, the air flow velocity output at the narrow throat 131 of the Laval nozzle 130 can reach 9 times the initial input velocity. During actual assembly, it is found that when this setting is adopted, it is only necessary to match it with a conventional small duct fan 120 to obtain a supersonic airflow at the air outlet of the Laval nozzle 130, so that after interacting with the atomized water flow sprayed from the atomizing nozzle 150, a high-speed mixed jet flow is ejected from the output port of the mixed flow nozzle 140, thereby achieving the purpose of efficiently extinguishing low-intensity forest fires. At the same time, it also helps to realize the miniaturization of high-pressure fine water mist spray guns, and then to obtain a portable fire extinguisher when matched with a miniaturized water tank.

[0050] In some embodiments, in order to improve the structural strength, the ducted fan 120 adopts an all-metal ducted fan, which also helps to maintain stable operation for a longer period of time. Specifically, the duct of the all-metal ducted fan adopts an all-metal JP duct.

[0051] In specific implementation, the ducted fan 120 can generate a thrust of 7 kg, and the Kv value is 875 rpm / V. For the above parameters, a miniaturized ducted fan 120 can be realized, which is convenient for providing supersonic airflow after cooperating with the Laval nozzle 130, and can provide a mixed jet flow of sufficient strength, and can also promote miniaturization and portability.

[0052] like Figure 2 As shown, in order to improve operability, the duct fan 120 is provided with a frequency conversion switch 121 for adjusting the output power. In actual use, by controlling the frequency conversion switch 121, the operator can optimize the output airflow size according to the fire points at different distances, avoid frequent movement, and help improve work efficiency and reduce work intensity.

[0053] like Figure 1-3As shown, in order to prevent large foreign objects from entering the ducted fan 120, a protective cover 170 is provided at the air inlet of the ducted fan 120. Specifically, a threaded connection method can be adopted to facilitate disassembly and maintenance while ensuring good connection strength. By providing the protective cover 170, the service life of the ducted fan 120 can be extended and the operating stability and reliability can be improved.

[0054] like Figure 1 , Figure 3 As shown, a handle component 180 is also provided, and the handle component 180 is connected to the upper part of the spray gun body. In specific implementation, the handle component 180 includes a rear handle 181 and a front handle 182. The rear handle 181 is arranged on the upper surface of the ducted fan 120, and the front handle 182 is arranged on the upper surface of the Laval nozzle 130. It is easy to understand that the ducted fan 120 and the Laval nozzle 130 are the main weight components. The cooperation of the rear handle 181 and the front handle 182 can enable the operator to stably control the high-pressure fine water mist spray gun and optimize the controllability.

[0055] like Figure 1-2 As shown, an infrared detection component 190 is also provided, and the infrared detection component 190 is installed on the spray gun body. In specific implementation, the infrared detection component 190 includes an infrared probe 191 and an infrared display screen 192. In order to facilitate detection, the infrared probe 191 is arranged on the upper surface of the mixed flow nozzle 140, and can be specifically installed in a snap-on manner. In order to improve the flexibility of use, the infrared display screen 192 is movably connected to the outer surface of the mixed flow nozzle 140 by a hinge. When in use, the infrared display screen 192 is flipped to form an angle of nearly 90° with the axis of the spray gun body, which is convenient for operators to check. When shut down, the infrared display screen 192 can be flipped to be close to the surface of the mixed flow nozzle 140, which reduces the occupied space and also protects the infrared display screen 192.

[0056] In addition, in order to simplify the control method, a frequency conversion switch 121 can be set to be electrically connected to the infrared probe 191 and the infrared display screen 192. In this way, the opening and closing of the duct fan 120, the infrared probe 191 and the infrared display screen 192 can be simultaneously controlled by the frequency conversion switch 121.

[0057] During implementation, in order to obtain better detection effect, the infrared probe 191 is required to meet the medium-wave infrared detection within the range of 3.0 to 5.0 μm, and specifically a 3.0 to 4.5 μm infrared probe 191 can be selected.

[0058] During implementation, in order to meet the display requirements, the infrared display screen 192 must satisfy the digital display of the temperature of the infrared probe 191 with a delay of less than 1s, and a digital display screen with a synchronization delay of 100ms can be specifically selected.

[0059] Example 2

[0060] like Figure 5-6 As shown, this embodiment provides a backpack fire extinguisher, including a backpack water tank 210 assembly 200 and the high-pressure fine water mist spray gun 100 of Example 1. The backpack water tank 210 assembly 200 is provided with a water outlet pipe 290, and the water outlet pipe 290 is used to connect to the water inlet pipe 110.

[0061] like Figure 5 As shown, the backpack water tank 210 assembly 200 includes a backpack water tank 210, an air supply component 220 and a power supply component 230. The surface of the backpack water tank 210 is concave to form an air supply component 220 installation cavity 211 and a power supply component 230 installation cavity 211. A water outlet 212 is provided at the lower part of the backpack water tank 210. The water outlet 212, the air supply component 220 and the water outlet pipe 290 are connected through a three-way needle valve 240. The power supply component 230 is provided with a power supply line 250. The power supply line 250 is used to be electrically connected to the duct fan 120. In addition, the power supply line 250 is also electrically connected to the infrared probe 191 and the infrared display screen 192 at the same time. During actual assembly, in order to avoid wear, the outer cover of the water outlet pipe and the power supply line 250 connected between the backpack water tank 210 assembly 200 and the high-pressure fine water mist spray gun 100 is provided with a protective sleeve 260, refer to Figure 5-6 The water outlet pipe 290 is hidden in the protective sleeve 260 .

[0062] In specific implementation, the air supply component 220 can be a high-pressure gas cylinder. In a preferred embodiment, in order to maintain a certain working time and avoid the weight and volume of the backpack water tank 210 assembly 200 being too large, the high-pressure gas cylinder can be a 4L aluminum alloy handwheel water bottle with a maximum pressure of 15Mpa. During actual operation, the output pressure of the high-pressure gas cylinder can be maintained at about 0.6Mpa by adjusting the pressure reducing valve 270. In this way, the ducted fan 120 in Example 1 can be used to enable the mixed flow nozzle 140 to spray a gas-liquid mixed jet flow with sufficient intensity and coverage area.

[0063] In specific implementation, the power supply component 230 is a rechargeable lithium-ion power battery. Since the lithium-ion power battery has a high energy density, it can effectively reduce the weight and volume of the battery, and promote the miniaturization and portability of the backpack fire extinguisher. In specific implementation, in order to improve practicality, the rechargeable lithium-ion power battery is required to provide the high-pressure fine water mist spray gun 100 with at least 30 minutes of power output endurance.

[0064] refer to Figure 6In order to facilitate the connection layout, the water outlet 212 and the three-way needle valve 240, as well as the air supply component 220 and the three-way needle valve 240 are connected by pipes, wherein a pressure reducing valve 270 is also provided between the air supply component 220 and the three-way needle valve 240. In actual use, the operator adjusts the air supply pressure of the air supply component 220 through the pressure reducing valve 270, and then adjusts the water flow rate input to the atomizing nozzle 150 through the water outlet pipe 290 and the water inlet pipe 110.

[0065] refer to Figure 5-6 Since the high-pressure gas cylinder has a certain weight, in order to evenly distribute the overall weight, a mounting cavity 211 for the high-pressure gas cylinder and the rechargeable lithium-ion power battery is formed by recessing the middle of the backpack water tank 210. Specifically, the high-pressure gas cylinder can be placed in the mounting cavity 211 in a horizontal manner, and the rechargeable lithium-ion power battery is placed at the bottom of the high-pressure gas cylinder. Keeping the gas supply end away from the high-pressure gas cylinder can reduce the risk of damage to the battery. In addition, in order to reduce the loss of gas supply pressure, the gas supply end of the high-pressure gas cylinder is located on the same side as the three-way needle valve 240, the water outlet 212, and the water outlet pipe 290, thereby shortening the necessary pipe length. For example, if they are all located on the right side of the backpack water tank 210, the water outlet pipe 290 is connected to the water inlet pipe 110 on the high-pressure fine water mist spray gun 100 from the right side, which can be adapted to the operation mode with the right hand as the dominant hand; at this time, refer to Figure 5 The rechargeable lithium-ion power battery is relatively located on the left side of the backpack water tank 210. The power supply line 250 led out from the rechargeable lithium-ion power battery is routed and extended into the protective sleeve 260 from the right side of the backpack water tank 210, and then further electrically connected to the duct fan 120, infrared probe 191, and infrared display screen 192 of the high-pressure fine water mist spray gun 100.

[0066] like Figure 6 As shown, the backpack water tank 210 is provided with an ergonomic backrest 280, which can relieve the back fatigue of the operator during the backpack operation. Specifically, a water inlet is provided at the upper part of the water tank, and the water inlet is sealed by a sealing cover 213. In order to improve the sealing performance, the sealing cover 213 and the water inlet are connected by a thread. In specific implementation, the maximum volume of the water tank in this embodiment is 18L.

[0067] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A high-pressure water mist spray gun, comprising a spray gun body and a water inlet pipe, characterized in that: The spray gun body includes a ducted fan, a Laval nozzle, a mixed flow nozzle and an atomizing nozzle; The ducted fan, the Laval nozzle, and the mixed flow nozzle are sequentially arranged along the axial direction of the spray gun body, the air outlet of the ducted fan is connected to the air inlet of the Laval nozzle, the air outlet of the Laval nozzle is connected to the air inlet of the mixed flow nozzle, and the atomizing nozzle is mounted on the inner side of the mixed flow nozzle through a nozzle mounting; The mixed flow nozzle is also provided with a through hole, and the water inlet pipe is connected with the atomizing nozzle through the through hole.

2. The high-pressure water mist spray gun according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the air inlet of the Laval nozzle to the cross-sectional area of ​​the narrowest part of the Laval nozzle is 5:1-10:

1.

3. The high-pressure water mist spray gun according to claim 1, characterized in that: The ducted fan is an all-metal ducted fan; and / or, the ducted fan is provided with a frequency conversion switch for adjusting the output power; and / or, the air inlet of the ducted fan is provided with a protective cover.

4. The high-pressure water mist spray gun according to any one of claims 1 to 3, characterized in that: The nozzle mounting frame includes a nozzle mounting seat and a plurality of support rods, the nozzle mounting seat is located in the middle of the cross section of the mixed flow nozzle, the outer ends of the support rods are supported on the inner surface of the mixed flow nozzle, and the inner ends of the support rods are connected to the nozzle mounting seat.

5. The high pressure water mist spray gun according to claim 4, characterized in that: The cross section of the mixed flow nozzle is circular, the nozzle mounting seat is arranged at the center of the cross section of the mixed flow nozzle, and the outer ends of the support rods are evenly distributed around the cross section of the mixed flow nozzle.

6. The high-pressure water mist spray gun according to any one of claims 1 to 3, characterized in that: A handle component is also provided, and the handle component is connected to the upper part of the spray gun body; and / or an infrared detection component is also provided, and the infrared detection component is installed on the spray gun body.

7. The high-pressure water mist spray gun according to claim 6, characterized in that: The handle component includes a rear handle and a front handle, the rear handle is arranged on the upper surface of the ducted fan, and the front handle is arranged on the upper surface of the Laval nozzle; and / or, the infrared detection component includes an infrared probe and an infrared display screen, the infrared probe is arranged on the mixed flow nozzle, and the infrared display screen is hinged to the mixed flow nozzle.

8. A backpack fire extinguisher, characterized in that: It comprises a backpack water tank assembly and the high-pressure fine water mist spray gun according to any one of claims 1-3, 5 and 7, wherein the backpack water tank assembly is provided with a water outlet pipe, and the water outlet pipe is used to connect to the water inlet pipe.

9. The backpack fire extinguisher according to claim 8, characterized in that: The backpack water tank assembly comprises a backpack water tank, an air supply component and a power supply component, wherein the surface of the backpack water tank is concave to form an air supply component installation cavity and a power supply component installation cavity; A water outlet is provided at the lower part of the backpack water tank, and the water outlet, the air supply component and the water outlet pipe are connected through a three-way needle valve; The power supply component is provided with a power supply line, and the power supply line is used to be electrically connected to the duct fan.

10. The backpack fire extinguisher according to claim 9, characterized in that: A pressure reducing valve is provided between the air supply component and the three-way needle valve; and / or, the backpack water tank is provided with an ergonomic backrest; and / or, the power supply component is a rechargeable lithium-ion power battery; and / or, the air supply component is a high-pressure gas cylinder.

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