阅读说明：本技术 一种液氮/二氧化碳混合喷射的灭火装置及灭火方法 (Fire extinguishing device and fire extinguishing method for mixed injection of liquid nitrogen and carbon dioxide ) 是由 于志金 张志鹏 徐澜 杨淞 谷雨 樊世星 陈霜霜 于 2021-01-27 设计创作，主要内容包括：本发明公开了一种液氮/二氧化碳混合喷射的灭火装置,包括液态CO-2瓶以及并排固定倒置的液氮瓶,液态CO-2瓶的顶部出口连接有液态CO-2导管并设置液态CO-2出液阀,液态CO-2导管的末端连接有液态CO-2喷枪并设置液态CO-2手柄开关,液氮瓶的顶部出口连接有液氮导管并设置液氮出液阀,液氮导管的末端连接有液氮喷枪并设置液氮手柄开关,液态CO-2喷枪与液氮喷枪的喷嘴相对且呈倾斜设置；本发明还公开了一种液氮/二氧化碳混合喷射的灭火装置的灭火方法,通过液态CO-2和液氮喷射形成干冰颗粒进行灭火。本发明通过对原料存储介质、输出喷射结构的设置,将液态CO-2转化成干冰,提高了整体灭火性能；本发明的灭火方法提高了灭火效率。(The invention discloses a fire extinguishing device with mixed injection of liquid nitrogen and carbon dioxide, which comprises liquid CO 2 Bottle and liquid nitrogen bottle, liquid CO fixed and inverted side by side 2 The outlet at the top of the bottle is connected with liquid CO 2 Conduit and disposing liquid CO 2 Liquid outlet valve, liquid CO 2 The tail end of the conduit is connected with liquid CO 2 Spray gun and liquid CO 2 A handle switch, a liquid nitrogen guide tube connected with the top outlet of the liquid nitrogen bottle and provided with a liquid nitrogen outlet valve, a liquid nitrogen spray gun connected with the tail end of the liquid nitrogen guide tube and provided with a liquid nitrogen handle switch, and liquid CO 2 The spray gun is opposite to the nozzle of the liquid nitrogen spray gun and is obliquely arranged; the invention also discloses a fire extinguishing method of the fire extinguishing device by mixed injection of liquid nitrogen/carbon dioxide, which is implemented by liquid CO 2 And liquid nitrogen is sprayed to form dry ice particles for extinguishing fire. The invention arranges the raw material storage medium and the output injection structure to inject the liquid CO 2 The fire extinguishing agent is converted into dry ice, so that the overall fire extinguishing performance is improved; the fire extinguishing method improves the fire extinguishing efficiency.)

1. A fire extinguishing device with mixed injection of liquid nitrogen and carbon dioxide is characterized in that,comprising liquid CO₂Bottle (1) and with liquid CO₂The bottles (1) are fixed side by side and placed and inverted liquid nitrogen bottles (2), and the liquid CO is₂The outlet at the top of the bottle (1) is connected with liquid CO₂A conduit (5) with liquid CO at the joint₂A liquid outlet valve (3), the liquid CO₂The tail end of the conduit (5) is connected with liquid CO₂Spray gun (10), said liquid CO₂The connecting pipeline of the spray gun (10) is provided with liquid CO₂Handle switch (7), the top exit linkage of liquid nitrogen bottle (2) has liquid nitrogen pipe (6), and the junction is provided with liquid nitrogen and goes out liquid valve (4), and the end-to-end connection of liquid nitrogen pipe (6) has liquid nitrogen spray gun (11), be provided with liquid nitrogen handle switch (8) on the connecting tube of liquid nitrogen spray gun (11), liquid CO handle switch (8) are gone up to liquid CO₂The spray gun (10) is opposite to the nozzle of the liquid nitrogen spray gun (11) and is arranged in an inclined way.

2. Fire extinguishing apparatus with mixed injection of liquid nitrogen/carbon dioxide according to claim 1, characterized in that the liquid CO is₂The bottle (1) and the inverted liquid nitrogen bottle (2) are both fixed on a back support (12), and a strap (13) is arranged on the back support (12).

3. Fire extinguishing apparatus with mixed injection of liquid nitrogen/carbon dioxide according to claim 1, characterized in that the nozzle of the liquid nitrogen lance (11) is connected with liquid CO₂The inclination angle alpha between the nozzles of the spray gun (10) is 15-45 degrees.

4. A fire extinguishing apparatus with mixed injection of liquid nitrogen/carbon dioxide according to claim 1, characterized in that a pressure boosting device is connected to the liquid nitrogen bottle (2).

5. Fire extinguishing device with mixed injection of liquid nitrogen/carbon dioxide according to claim 1, characterized in that the liquid nitrogen conduit (6), liquid CO₂A conduit (5), a liquid nitrogen spray gun (11) and liquid CO₂The outer surfaces of the spray guns (10) are all coated with heat insulation materials.

6. According to claim 1The fire extinguishing device with mixed injection of liquid nitrogen and carbon dioxide is characterized in that the liquid nitrogen spray gun (11) is close to a liquid nitrogen handle switch (8) and is connected with liquid CO₂Near the liquid CO on the lance (10)₂The handle switch (7) is fixedly connected with the connecting piece (9).

7. Fire extinguishing device with mixed injection of liquid nitrogen/carbon dioxide according to claim 1, characterized by the fact that the liquid nitrogen hand switch (8) and the liquid CO₂The handle switches (7) are all push type handle switches.

8. A fire extinguishing method using a liquid nitrogen/carbon dioxide mixed jet fire extinguishing apparatus according to any one of claims 1 to 7, characterized by comprising the steps of:

step one, spraying liquid CO in a fire extinguishing device by mixing liquid nitrogen/carbon dioxide₂Liquid CO is filled into the bottle (1) and the liquid nitrogen bottle (2) correspondingly₂And liquid nitrogen, then inverting the liquid nitrogen bottle (2) and mixing with liquid CO₂The bottles (1) are fixedly placed side by side and then connected with other structural components to obtain the assembled fire extinguishing device;

step two, transferring the fire extinguishing device assembled in the step one to a fire area, and then opening liquid CO₂A liquid outlet valve (3) for discharging liquid CO₂The lance (10) and the liquid nitrogen lance (11) are aligned to the flame and liquid CO is turned on₂A handle switch (7) is used for rapidly and sequentially opening a liquid nitrogen outlet valve (4) and a liquid nitrogen handle switch (8) to ensure that liquid CO is in a liquid state₂Spraying liquid nitrogen to form dry ice particles for fire extinguishing;

step three, finishing the fire extinguishing operation or liquid CO₂After the liquid nitrogen is exhausted, the liquid nitrogen outlet valve (4) is closed in time, and then the liquid CO is slowly closed₂The liquid outlet valve (3) is closed, and then liquid CO is closed₂A handle switch (7) and a liquid nitrogen handle switch (8) for disassembling or reassembling the fire extinguishing device.

Technical Field

The invention belongs to the technical field of fire extinguishing, and particularly relates to a fire extinguishing device and a fire extinguishing method for mixed injection of liquid nitrogen and carbon dioxide.

Background

At present, under the frequent trend of small fire in dense building groups, the traditional fire extinguishing technology is increasingly difficult to meet the fire extinguishing demand of people, if the small fire is difficult to control in the initial stage of fire, the consequence that the fire is difficult to estimate is caused after the fire expands and spreads into big fire, and therefore the fire extinguishing needs to be fast and sufficient. At present, the conventional fire extinguishing methods mainly comprise chemical foam, dry powder, carbon dioxide and water-based fire extinguishers, but the time, place and type of fire occurrence are difficult to predict, the general fire extinguishing method has large limitation, and the fire area is difficult to extinguish efficiently and quickly. Therefore, the development of the fire extinguishing device with wide applicability, long fire extinguishing time and good carrying capacity has important significance for improving the fire extinguishing capacity of urban fires.

Generally, the occurrence of fire is closely related to temperature and oxygen concentration, and the key to management is to isolate oxygen and remove heat. Research shows that carbon dioxide forms dry ice below the triple point (-56.6 ℃), the dry ice absorbs a large amount of heat in a fire area in the sublimation process to cause the temperature of the fire area to be reduced, and along with the generation of a large amount of gaseous carbon dioxide, oxygen in the fire area is effectively isolated, the extinguishing of a fire source is accelerated, and the dry ice is undoubtedly a fire extinguishing material with great development prospect if the dry ice can be attached to the fire source point. However, the carbon dioxide is unstable in nature and difficult to store in the form of dry ice and extinguish fire, and liquid carbon dioxide is only formed by a small amount of dry ice during spraying, so that the fire extinguishing performance is poor, and therefore, a device method for extinguishing fire by reusing carbon dioxide is still needed to be further researched.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a fire extinguishing device for mixed injection of liquid nitrogen and carbon dioxide, aiming at the defects of the prior art. The device is used for treating raw material liquid CO₂And the arrangement of a liquid nitrogen storage medium, an output structure and an injection structure realizes the liquid CO in the liquid nitrogen₂Is sufficiently cooled to make liquid CO₂The dry ice particles are converted into the dry ice particles to be sprayed into a fire area, the dry ice particles are cooled and oxygen-isolated, the dry ice sublimation performance is used for isolating oxygen and retarding fire, and the liquid nitrogen is used for cooling and isolating oxygen to achieve positive dual fire extinguishing effects and improving the overall fire extinguishing performance.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a fire extinguishing device with mixed injection of liquid nitrogen and carbon dioxide is characterized by comprising liquid CO₂Bottle and with liquid CO₂Liquid nitrogen bottles with bottles fixed side by side and placed and inverted, wherein the liquid CO is₂The outlet at the top of the bottle is connected with liquid CO₂A conduit with liquid CO at the joint₂Liquid outlet valve, said liquid CO₂The tail end of the conduit is connected with liquid CO₂Spray gun of said liquid CO₂The connecting pipeline of the spray gun is provided with liquid CO₂The handle switch, the top exit linkage of liquid nitrogen bottle has the liquid nitrogen pipe, and the junction is provided with liquid nitrogen and goes out the liquid valve, and the end-to-end connection of liquid nitrogen pipe has the liquid nitrogen spray gun, be provided with liquid nitrogen handle switch on the connecting tube of liquid nitrogen spray gun, liquid CO is liquid₂The spray gun is opposite to the nozzle of the liquid nitrogen spray gun and is obliquely arranged.

The fire extinguishing device adopting mixed injection of liquid nitrogen and carbon dioxide is characterized in that the liquid CO is sprayed into the fire extinguishing device₂The bottle and the inverted liquid nitrogen bottle are both fixed on a back support, and a back belt is arranged on the back support.

The fire extinguishing device adopting mixed injection of liquid nitrogen and carbon dioxide is characterized in that a nozzle of a liquid nitrogen spray gun and liquid CO are arranged₂Nozzle of spray gunThe angle of inclination between alpha and alpha is 15-45 deg.

The fire extinguishing device for mixed injection of liquid nitrogen and carbon dioxide is characterized in that a pressurizing device is connected to a liquid nitrogen bottle.

The fire extinguishing device adopting mixed injection of liquid nitrogen and carbon dioxide is characterized in that a liquid nitrogen conduit and liquid CO are arranged₂Conduit, liquid nitrogen lance and liquid CO₂The outer surface of the spray gun is coated with heat insulation materials.

The fire extinguishing device for mixed injection of liquid nitrogen/carbon dioxide is characterized in that the liquid nitrogen spray gun is close to a liquid nitrogen handle switch and is connected with liquid CO₂Near liquid CO on the lance₂The handle switch is fixedly connected through a connecting piece.

The fire extinguishing device adopting mixed injection of liquid nitrogen and carbon dioxide is characterized in that a liquid nitrogen handle switch and liquid CO are arranged₂The handle switch is a push type handle switch.

In addition, the invention also provides a fire extinguishing method of the fire extinguishing device with the mixed injection of liquid nitrogen and carbon dioxide, which is characterized by comprising the following steps:

step one, spraying liquid CO in a fire extinguishing device by mixing liquid nitrogen/carbon dioxide₂Liquid CO is filled into the bottle and the liquid nitrogen bottle correspondingly₂And liquid nitrogen, then inverting the liquid nitrogen bottle and mixing with liquid CO₂The bottles are fixedly placed side by side and then connected with other structural components to obtain the assembled fire extinguishing device;

step two, transferring the fire extinguishing device assembled in the step one to a fire area, and then opening liquid CO₂A liquid outlet valve for discharging liquid CO₂The lance and the liquid nitrogen lance are aligned to the flame and liquid CO is turned on₂A handle switch is used for rapidly and sequentially opening the liquid nitrogen outlet valve and the liquid nitrogen handle switch to ensure that liquid CO is in a liquid state₂Spraying liquid nitrogen to form dry ice particles for fire extinguishing;

step three, finishing the fire extinguishing operation or liquid CO₂After the liquid nitrogen is exhausted, the liquid nitrogen outlet valve is closed in time, and then the liquid CO is slowly closed₂Liquid outlet valve, then liquid CO is closed₂The handle switch and the liquid nitrogen handle switch are used for disassembling or reassembling the fire extinguishing device.

The carbon dioxide is present in different forms under different circumstances. From the three-phase diagram of carbon dioxide in FIG. 1, liquid CO is shown₂During the spraying process, the temperature is also greatly reduced due to the sharp reduction of the pressure, and the generation of the dry ice is accompanied, but the cold energy is quickly dissipated during the spraying process, so that the quantity of the dry ice is small overall.

The temperature of liquid nitrogen under standard atmospheric pressure is generally-196 ℃, and the invention utilizes the triphase transition property of carbon dioxide and the low-temperature performance of liquid nitrogen to carry out CO conversion in liquid state₂The spraying process of (1) adopts liquid nitrogen for spraying and cooling, and liquid CO is used for spraying and cooling₂Continuous instantaneous impact collision with liquid nitrogen to make liquid CO₂The dry ice particles are rapidly cooled to the temperature below-56.6 ℃ of the phase transition point, so that a large amount of dry ice particles are continuously generated for fire extinguishing operation, the generation amount of the dry ice particles is effectively increased, and the fire extinguishing efficiency is improved; the dry ice sublimes fast after meeting fire inflation, has absorbed a large amount of heats in the fire district, can reach high efficiency, spray abundant fire extinguishing effect, and dry ice granule and liquid nitrogen compound in coordination have strengthened fire extinguishing effect.

Compared with the prior art, the invention has the following advantages:

1. the fire extinguishing device for mixed injection of liquid nitrogen/carbon dioxide is used for extinguishing raw material liquid CO₂And the arrangement of a liquid nitrogen storage medium, an output structure and an injection structure realizes the liquid CO in the liquid nitrogen₂Is sufficiently cooled to make liquid CO₂The dry ice particles are converted into the dry ice particles to be sprayed into a fire area, the dry ice particles are cooled and oxygen-isolated, the dry ice sublimation performance is used for isolating oxygen and retarding fire, and the liquid nitrogen is used for cooling and isolating oxygen to achieve positive dual fire extinguishing effects and improving the overall fire extinguishing performance.

2. The fire extinguishing device for mixed injection of liquid nitrogen/carbon dioxide increases raw material CO by arranging the back support and the braces₂And the loading capacity of liquid nitrogen, the overall fire extinguishing performance is improved, meanwhile, the device is convenient to carry and use by operators, flexible and mobile, and the fire extinguishing efficiency is improved.

3. Liquid nitrogen/dioxygen of the inventionThe fire extinguishing device for the mixed injection of carbon dioxide controls the nozzle of a liquid nitrogen spray gun and liquid CO₂The inclination angle between the nozzles of the spray gun effectively strengthens the liquid nitrogen and the secondary liquid CO₂Thereby improving the effect of liquid nitrogen on liquid CO₂The cooling effect and the cooling efficiency of (2) and the generation amount of the dry ice particles are improved.

4. The fire extinguishing device for mixed injection of liquid nitrogen/carbon dioxide is provided with a liquid nitrogen handle switch and liquid CO₂The handle switch is used for respectively controlling the liquid nitrogen and the liquid CO₂The spraying flow rate and the spraying speed effectively control the generation amount and the generation speed of the dry ice particles.

5. The fire extinguishing device with the mixed injection of the liquid nitrogen and the carbon dioxide can extinguish fires of general A, B, C, E and the like, overcomes the defects of the traditional fire extinguishing device, and has wide application range and high application value.

6. The invention utilizes the triphase transition property of carbon dioxide and the low-temperature performance of liquid nitrogen to carry out CO conversion in liquid state₂The spraying process in adopt liquid nitrogen to spray the cooling, effectively increased the formation volume of dry ice granule to improve fire extinguishing efficiency, reach quick high efficiency, spray abundant fire extinguishing effect.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a three-phase diagram of carbon dioxide.

FIG. 2 is a front view of the fire extinguishing unit with mixed liquid nitrogen/carbon dioxide injection according to the present invention.

FIG. 3 is a left side view of the fire suppression apparatus for mixed liquid nitrogen/carbon dioxide injection of the present invention.

FIG. 4 shows the liquid nitrogen spray gun and liquid CO in the fire extinguishing apparatus with mixed injection of liquid nitrogen/carbon dioxide according to the present invention₂The structure of the spray gun is shown schematically.

Description of reference numerals:

1-liquid CO₂A bottle; 2-liquid nitrogen bottle; 3-liquid CO₂A liquid outlet valve;

4-liquid nitrogen outlet valve; 5-liquid CO₂A conduit; 6-liquid nitrogen conduit;

7-liquid CO₂A handle switch; 8-liquid nitrogen handle switch; 9-a connecting piece;

10-liquid CO₂A spray gun; 11-liquid nitrogen spray gun; 12-backing;

13-carrying strap.

Detailed Description

The fire extinguishing apparatus with mixed injection of liquid nitrogen/carbon dioxide according to the present invention is described in detail by example 1.

Example 1

As shown in FIGS. 2 and 3, the fire extinguishing apparatus of the mixed injection of liquid nitrogen/carbon dioxide of the present embodiment includes liquid CO₂Bottle 1 and with liquid CO₂Bottle 1 is a liquid nitrogen bottle 2 which is fixed side by side and placed and inverted, and the liquid CO is₂The top outlet of the bottle 1 is connected with liquid CO₂A conduit 5 with liquid CO at the joint₂Outlet valve 3, said liquid CO₂The end of the conduit 5 is connected with liquid CO₂Spray gun 10, said liquid CO₂The connecting pipe of the spray gun 10 is provided with liquid CO₂Handle switch 7, the top exit linkage of liquid nitrogen bottle 2 has liquid nitrogen pipe 6, and the junction is provided with liquid nitrogen and goes out liquid valve 4, and the end-to-end connection of liquid nitrogen pipe 6 has liquid nitrogen spray gun 11, be provided with liquid nitrogen handle switch 8 on liquid nitrogen spray gun 11's the connecting tube, liquid CO₂The lance 10 is arranged opposite to the nozzle of the liquid nitrogen lance 11 and is inclined.

The fire extinguishing device for mixed injection of liquid nitrogen/carbon dioxide of the embodiment is provided with the liquid CO which is fixedly arranged side by side₂Bottle 1 and inverted liquid nitrogen bottle 2 for storing liquid CO respectively₂Bottle and liquid nitrogen due to liquid CO₂Liquid CO in bottle₂The liquid CO has the pressure of 2-3 MPa, and the liquid nitrogen has no additional pressure, so that the liquid CO is mixed with the gas₂The liquid nitrogen bottle 2 is arranged in an inverted state with the bottle 1 arranged in a positive position, which is beneficial to the smooth outflow of liquid nitrogen and simultaneously ensures the liquid CO₂And the safety of use of liquid nitrogen;

by in liquid CO₂The bottom outlet of the bottle 1 is connected with liquid CO₂Catheter tube5. In liquid CO₂The end of the conduit 5 is connected with liquid CO₂Spray gun 10 for ensuring liquid CO₂Liquid CO in bottle 1₂By liquid CO₂The conduit 5 flows out and delivers to liquid CO₂The spray gun 10 sprays out and simultaneously liquid CO is arranged₂Liquid outlet valve 3 for controlling liquid CO₂Opening and closing of the bottle 1 to control or prevent liquid CO₂Combined with liquid CO₂The handle switch 7 controls the liquid CO₂From liquid CO₂The ejection flow rate and ejection rate in the spray gun 10;

the outlet at the top of the liquid nitrogen bottle 2 is connected with a liquid nitrogen guide pipe 6, the tail end of the liquid nitrogen guide pipe 6 is connected with a liquid nitrogen spray gun 11, so that liquid nitrogen in the liquid nitrogen bottle 2 flows out through the liquid nitrogen guide pipe 6 and is conveyed to the liquid nitrogen spray gun 11 to be sprayed out, meanwhile, the opening and closing of the liquid nitrogen bottle 2 are controlled by arranging a liquid nitrogen outlet valve 4 to control or prevent the liquid nitrogen from flowing out, and the spraying flow and the spraying speed of the liquid nitrogen from the liquid nitrogen spray gun 11 are controlled by combining a liquid nitrogen handle switch 8;

in addition, by separately providing a liquid nitrogen conduit 6 and liquid CO₂The guide pipe 5 and the spray gun correspondingly connected with the guide pipe avoid liquid nitrogen and liquid CO₂Premixing to generate dry ice to block a pipeline; by introducing liquid CO₂The nozzle of the lance 10 is arranged opposite to and inclined with respect to the nozzle of the liquid nitrogen lance 11 so that the liquid nitrogen sprayed from the nozzle of the liquid nitrogen lance 11 and the liquid CO are injected from the liquid₂Liquid CO sprayed from the nozzle of the lance 10₂The liquid CO is collided and rapidly mixed by continuous impact at a certain angle, and the low-temperature property of the liquid nitrogen is utilized to mix the liquid CO₂Rapidly cooling to a temperature below-56.6 ℃ of phase transition point to continuously generate a large amount of dry ice particles, driving the dry ice to continuously spray into a fire area by liquid nitrogen, effectively cooling and isolating oxygen due to good adhesion of the dry ice particles to effectively adhere to the surface of a combustion object in the fire area, playing a fire extinguishing role, and then rapidly subliming the dry ice when the dry ice is heated in the fire and converting the dry ice into gaseous CO₂The dry ice can absorb a large amount of heat generated by the combustion object in the sublimation process, so that the combustion temperature of the combustion object is continuously reduced, and the combustion is prevented from proceeding; at the same time, due to CO₂The nature of the heavy gas, i.e. the density, is greater than that of air, gaseous CO₂Covered on the burnerA protective layer is formed on the surface of the burning object, so that oxygen is effectively isolated, the burning object is further prevented from being continuously burnt, and the aim of quickly extinguishing the fire is fulfilled; in addition, the liquid nitrogen also has the functions of temperature reduction and oxygen insulation after being sprayed into a fire area, and also has the functions of fire extinguishing and flame retarding.

In conclusion, the fire extinguishing device for mixed injection of liquid nitrogen and carbon dioxide in the embodiment adopts the way of spraying liquid CO on the raw material₂And the arrangement of a liquid nitrogen storage medium, an output structure and an injection structure realizes the liquid CO in the liquid nitrogen₂Is sufficiently cooled to make liquid CO₂The dry ice particles are converted into the dry ice particles to be sprayed into a fire area, the dry ice particles are cooled and oxygen-isolated, the dry ice sublimation performance is used for isolating oxygen and retarding fire, and the liquid nitrogen is used for cooling and isolating oxygen to achieve positive dual fire extinguishing effects and improving the overall fire extinguishing performance.

Preferably, the liquid CO is present in this embodiment₂The bottle 1 and the inverted liquid nitrogen bottle 2 are both fixed on a back support 12, and a back belt 13 is arranged on the back support 12. By this arrangement, liquid CO is increased₂The volumes of the bottle 1 and the liquid nitrogen bottle 2 are increased, and further the raw material CO is added₂And the loading capacity of liquid nitrogen, the overall fire extinguishing performance is improved; simultaneously, it is more to compare the fire extinguishing medium that hand fire extinguisher formed, and the time of putting out a fire is longer, compares large-scale extinguishing device, portable, transportation more to make things convenient for the operator to bear and in the regional operation of putting out a fire of scene of a fire, nimble flexible, improved fire extinguishing efficiency.

As shown in FIG. 4, preferably, the nozzle of the liquid nitrogen lance 11 and the liquid CO are arranged in the present embodiment₂The angle of inclination α between the nozzles of the lance 10 is 15 ° to 45 °. The inclination angle is the central line of the nozzle of the liquid nitrogen spray gun 11 and the liquid CO₂The angle of the centre line of the nozzle of lance 10, by virtue of the preferred angle of inclination, further enhances the mixing of the liquid nitrogen sprayed from the nozzle of liquid nitrogen lance 8 with the liquid CO₂Liquid CO sprayed from the nozzle of the lance 10₂The continuous impact effect enhances the micro-mixing effect, strengthens the mixing outside the direct impact area, and avoids the existence of dead areas, thereby improving the effect of liquid nitrogen on liquid CO₂The cooling effect and the cooling efficiency of (2) and the generation amount of the dry ice particles are improved.

Preferably, a pressurizing device is connected to the liquid nitrogen bottle 2 in the embodiment. The liquid nitrogen can flow out through the pressurizing device, the flow speed of the liquid nitrogen is effectively increased, the liquid nitrogen can be smoothly sprayed out from the liquid nitrogen spray gun 11, and the liquid nitrogen cannot be blocked easily.

Preferably, in this embodiment the liquid nitrogen conduit 6, liquid CO₂Conduit 5, liquid nitrogen lance 11 and liquid CO₂The outer surface of the spray gun 10 is coated with a thermal insulation material. Due to liquid nitrogen and liquid CO₂Due to the low temperature characteristics of the liquid nitrogen, the liquid nitrogen guide pipe 6, the liquid nitrogen spray gun 11 and the liquid CO can flow through₂Conduit 5 and liquid CO₂The surface temperature of the spray gun 10 is reduced, and the operator is prevented from being hurt by frostbite caused by contacting each conduit and the spray gun in the using process by coating the heat insulation material.

Preferably, the liquid nitrogen spray gun 11 of the embodiment is close to the liquid nitrogen handle switch 8 and is connected with liquid CO₂Near liquid CO on lance 10₂The handle switch 7 is fixedly connected with the connecting piece 9. By the arrangement, the liquid nitrogen spray gun 11 and liquid CO are enabled to be communicated₂The spray gun 10 is fixedly connected, forms a fixed inclination angle and has a certain distance, and effectively improves liquid nitrogen and liquid CO₂The impact process of (2) further increasing the generation amount of dry ice particles; meanwhile, the two spray guns are convenient to hold, fix and use, and an operator can easily carry out liquid nitrogen handle switch 8 and liquid CO₂The handle switch 7 is used for adjusting and controlling the injection flow and the injection rate.

Preferably, in this embodiment, the liquid nitrogen hand switch 8 and the liquid CO₂The handle switch 7 is a push type handle switch. The optimized switch is convenient to operate and easy to control liquid nitrogen and liquid CO₂The spraying from the corresponding spray gun is easy to realize and the cost is lower.

The fire extinguishing method of the fire extinguishing apparatus by mixed injection of liquid nitrogen/carbon dioxide of the present invention is described in detail by example 2.

Example 2

The fire extinguishing method of the fire extinguishing device with mixed injection of liquid nitrogen and carbon dioxide in the embodiment comprises the following steps:

step one, mixing liquid nitrogen/carbon dioxideLiquid CO in a sprayed fire extinguishing device₂Liquid CO is filled into the bottle 1 and the liquid nitrogen bottle 2 correspondingly₂And liquid nitrogen, then inverting the liquid nitrogen bottle 2 and mixing with liquid CO₂Bottles 1 are fixed side by side and sequentially placed in liquid CO₂The top outlet of the bottle 1 is connected with a liquid nitrogen conduit 6 and a liquid nitrogen spray gun 11, a liquid nitrogen outlet valve 4 is arranged at the outlet connection part of the liquid nitrogen bottle 2, a liquid nitrogen handle switch 8 is arranged on the liquid nitrogen spray gun 11, and liquid CO is sequentially filled in the liquid nitrogen spray gun₂The bottom outlet of the bottle 1 is connected with liquid CO₂Conduit 5 and liquid CO₂Spray gun 10 and in liquid CO₂The outlet connection of the bottle 1 is provided with liquid CO₂A liquid outlet valve 3 for discharging CO in liquid state₂Liquid CO is mounted on the spray gun 10₂A handle switch 7 to obtain an assembled fire extinguishing apparatus;

step two, transferring the fire extinguishing device assembled in the step one to a fire area, and then opening liquid CO₂A liquid outlet valve 3 for discharging liquid CO₂Spray gun 10 and liquid nitrogen spray gun 11 are aligned to the flame and liquid CO is turned on₂A handle switch 7 is used for rapidly and sequentially opening a liquid nitrogen outlet valve 4 and a liquid nitrogen handle switch 8, so that liquid CO is obtained₂Spraying liquid nitrogen to form dry ice particles for extinguishing fire, and regulating liquid CO according to fire intensity in fire area₂The liquid CO is regulated by a handle switch 7 and a liquid nitrogen handle switch 8₂And the ejection flow rate of liquid nitrogen, thereby controlling the generation amount of dry ice particles;

step three, finishing the fire extinguishing operation or liquid CO₂After the liquid nitrogen is exhausted, the liquid nitrogen outlet valve 4 is closed in time, and then the liquid CO is slowly closed₂The liquid outlet valve 3 is closed, and then liquid CO is closed₂A handle switch 7 and a liquid nitrogen handle switch 8 for disassembling or reassembling the fire extinguishing device.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.