阅读说明：本技术 压缩空气泡沫灭火系统用空气混合器及灭火系统 (Air mixer for compressed air foam fire extinguishing system and fire extinguishing system ) 是由 张佳庆 黄勇 周亦夫 李金忠 张晓东 程登峰 罗沙 洪清泉 过羿 沈旭钊 刘睿 于 2021-08-06 设计创作，主要内容包括：本发明公开一种压缩空气泡沫灭火系统用空气混合器,通过进液管和进气管分别输送泡沫液和压缩空气,压缩空气和泡沫液通过第一锥管到达直管时,由于第一锥管两端的截面不一,泡沫液和压缩空气到达第一锥管的输出端、路径变窄,处于压缩过程,在高压气流的作用下可充分混合泡沫液,混合后的泡沫液到达直管的多孔板,能够二次混合,通过第二锥管排出时,路径变宽,处于释放状态,在压缩与释放的过程中提高了泡沫液的混合质量,能够充分发挥泡沫液的灭火效果,通过缓冲机构和储能机构能够降低振动及气压变化带来的破坏力。(The invention discloses an air mixer for a compressed air foam fire extinguishing system, which is characterized in that foam liquid and compressed air are respectively conveyed through a liquid inlet pipe and an air inlet pipe, when the compressed air and the foam liquid reach a straight pipe through a first conical pipe, the sections of the two ends of the first conical pipe are different, the paths of the foam liquid and the compressed air reaching the output end of the first conical pipe are narrowed, the foam liquid can be fully mixed in the compression process under the action of high-pressure airflow, the mixed foam liquid reaches a perforated plate of the straight pipe and can be secondarily mixed, when the foam liquid is discharged through a second conical pipe, the paths are widened and are in a release state, the mixing quality of the foam liquid is improved in the compression and release processes, the fire extinguishing effect of the foam liquid can be fully exerted, and the destructive power caused by vibration and air pressure change can be reduced through a buffer mechanism and an energy storage mechanism.)

1. An air mixer for a compressed air foam fire extinguishing system is characterized by comprising a liquid inlet pipe (1), an air inlet pipe (2), a straight pipe (3), a first taper pipe (4), a second taper pipe (5), an energy storage mechanism (6) and a buffer mechanism (7); the first taper pipe (4) is a three-way pipe; according to the airflow direction, the air inlet pipe (2), the first conical pipe (4), the straight pipe (3) and the second conical pipe (5) are sequentially connected, and according to the foam liquid flow direction, the liquid inlet pipe (1), the first conical pipe (4), the straight pipe (3) and the second conical pipe (5) are sequentially connected; the small-caliber ends of the first conical pipe (4) and the second conical pipe (5) are respectively connected with the inlet end and the outlet end of the straight pipe (3);

the energy storage mechanism (6) comprises a blind pipe (61), a piston (62) and a pressure spring (63), an inlet of the blind pipe (61) is fixed with an opening on the pipe wall of the air inlet pipe (2) in a sealing mode, an inner cavity of the blind pipe (61) is communicated with an inner cavity of the air inlet pipe (2), the piston (62) is limited in the blind pipe (61), and the pressure spring (63) is limited between the piston (62) and a blind end of the blind pipe (61);

the buffer mechanism (7) comprises a positioning ring (71), a guide post (72), a guide sleeve (73) and a damping spring (74); a limiting groove is formed in the periphery of the positioning ring (71), the straight pipe (3) is limited in the limiting groove, the positioning ring (71) is fixed on the guide post (72), and the damping spring (74) is sleeved on the guide post (72); one end of the guide post (72) is limited in the guide sleeve (73) and is in sliding fit with the guide sleeve (73), and the damping spring (74) is limited between the positioning ring (71) and the guide sleeve (73); the guide sleeve (73) is fixed in position.

2. An air mixer for a compressed air foam fire extinguishing system according to claim 1, characterized in that the energy storage means (6) are two, one on the same side or on different sides of the air inlet pipe (2).

3. An air mixer for a compressed air foam fire extinguishing system according to claim 1, characterized in that the number of damping mechanisms (7) is two, one on the same side or on different sides of the straight pipe (3).

4. An air mixer for a compressed air foam fire extinguishing system according to any of claims 1-3, characterized in that a perforated plate 31 is also fixed inside the straight pipe (3).

5. An air mixer for a compressed air foam fire extinguishing system according to claim 4, characterized in that the air mixer further comprises a housing (8), the straight pipe (3), the first taper pipe (4), the second taper pipe (5), the energy storage mechanism (6) and the buffer mechanism (7) are all located in the housing (8), the inlet ends of the liquid inlet pipe (1) and the air inlet pipe (2) are led out from the housing (8) to be connected with external equipment, and the outlet end of the straight pipe (3) is led out from the housing (8) to be connected with external equipment.

6. An air mixer for a compressed air foam fire extinguishing system according to claim 5, characterized in that the guide sleeve (73) is fixed inside the housing (8).

7. An air mixer for a compressed air foam fire extinguishing system according to claim 6, characterized in that the end of the guide post (72) remote from the guide sleeve (73) abuts against the inner wall of the housing (8), and a rubber pad (75) is fixed to the abutting surface of the guide post (72).

8. An air mixer for a compressed air foam fire extinguishing system according to any of claims 1 to 3, characterized in that a non-return valve (11) is also mounted on the liquid inlet pipe (1).

9. An air mixer for a compressed air foam fire extinguishing system according to any one of claims 1 to 3, characterized in that a digital air pressure gauge (21) and a digital hydraulic pressure gauge (12) are respectively installed on the air inlet pipe (2) and the liquid inlet pipe (1).

10. A compressed air foam fire suppression system comprising a foam concentrate supply system, a compressed air supply system, a foam injection system, and an air mixer as claimed in any one of claims 1 to 9; the outlet end of the foam liquid supply system is connected with the inlet end of the liquid inlet pipe (1), the outlet end of the compressed air supply system is connected with the inlet end of the air inlet pipe (2), and the inlet end of the foam injection system is connected with the outlet end of the second taper pipe (5).

Technical Field

The invention relates to the technical field of fire safety, in particular to an air mixer for a compressed air foam fire extinguishing system and the fire extinguishing system.

Background

The term "fire fighting" refers to eliminating hidden danger and preventing disasters, and the narrow meaning means that people know the meaning of extinguishing fire at the initial stage, and mainly includes rescue of personnel on the fire scene, rescue of important facility equipment and cultural relics, safety protection and rescue of important property, extinguishing fire and the like;

foam liquid is used for fire extinguishing in fire fighting, foam and water are directly and simply mixed and then are sprayed out through compressed air in the conventional compressed air foam fire extinguishing system, the mixing quality is poor, the fire extinguishing effect of the foam liquid cannot be fully exerted, and when compressed air is conveyed, the pipeline is easily damaged due to unstable air pressure.

When the system is started to work normally, water enters the system from the inlet of the pump, the pump can only pump water to fight fire like a common fire pump, and the low-pressure performance of the integrated full-automatic compressed air foam fire extinguishing system is completely the same as that of a common vehicle-mounted pump; if the valve of the B-type foam mixer on the fire pump is opened at the moment, the requirement of B-type fire fighting can be met; if the foam liquid supply system is opened at the moment, mixing the A-type foam stock solution with water with pressure pumped by a water pump to form foam mixed liquid, and if the pneumatic valve of the air supply pipeline is closed at the moment, pumping the water foam mixed liquid by the system; the pneumatic valve of the air supply system is opened, the water foam mixed liquid is mixed with the compressed air, and the water foam mixed liquid is changed into air foam which is shot by a foam gun or a gun, so that efficient and rapid fire extinguishing is realized; the dryness and humidity of the foam liquid can be controlled and adjusted by controlling the flow of injected compressed air; in addition, the waterway can be closed, and the system only provides compressed air flow to the outside. In the scheme, the air and the foam liquid are mixed while the foam mixed liquid is sprayed by compressed air. However, in the case where the gas pressure is unstable, the pipe is likely to be broken.

Disclosure of Invention

The invention aims to solve the technical problem that a pipeline is easy to break due to unstable air pressure of compressed air in a foam fire extinguisher, and provides an air mixer for a compressed air foam fire extinguishing system.

The invention solves the technical problems through the following technical means:

an air mixer for a compressed air foam fire extinguishing system comprises a liquid inlet pipe (1), an air inlet pipe (2), a straight pipe (3), a first taper pipe (4), a second taper pipe (5), an energy storage mechanism (6) and a buffer mechanism (7); the first taper pipe (4) is a three-way pipe; according to the airflow direction, the air inlet pipe (2), the first conical pipe (4), the straight pipe (3) and the second conical pipe (5) are sequentially connected, and according to the foam liquid flow direction, the liquid inlet pipe (1), the first conical pipe (4), the straight pipe (3) and the second conical pipe (5) are sequentially connected; the small-caliber ends of the first conical pipe (4) and the second conical pipe (5) are respectively connected with the inlet end and the outlet end of the straight pipe (3);

the energy storage mechanism (6) comprises a blind pipe (61), a piston (62) and a pressure spring (63), an inlet of the blind pipe (61) is fixed with an opening on the pipe wall of the air inlet pipe (2) in a sealing mode, an inner cavity of the blind pipe (61) is communicated with an inner cavity of the air inlet pipe (2), the piston (62) is limited in the blind pipe (61), and the pressure spring (63) is limited between the piston (62) and a blind end of the blind pipe (61);

the buffer mechanism (7) comprises a positioning ring (71), a guide post (72), a guide sleeve (73) and a damping spring (74); a limiting groove is formed in the periphery of the positioning ring (71), the straight pipe (3) is limited in the limiting groove, the positioning ring (71) is fixed on the guide post (72), and the damping spring (74) is sleeved on the guide post (72); one end of the guide post (72) is limited in the guide sleeve (73) and is in sliding fit with the guide sleeve (73), and the damping spring (74) is limited between the positioning ring (71) and the guide sleeve (73); the guide sleeve (73) is fixed in position.

The invention respectively conveys foam liquid and compressed air through the liquid inlet pipe and the air inlet pipe, when the compressed air and the foam liquid reach the straight pipe through the first conical pipe, because the sections at the two ends of the first conical pipe are different, the paths of the foam liquid and the compressed air reaching the output end of the first conical pipe are narrowed, the foam liquid can be fully mixed under the action of high-pressure airflow in the compression process, the mixed foam liquid reaches the porous plate of the straight pipe and can be secondarily mixed, when the foam liquid is discharged through the second conical pipe, the paths are widened and are in a release state, the mixing quality of the foam liquid is improved in the compression and release processes, the fire extinguishing effect of the foam liquid can be fully exerted, the guide sleeve can guide the guide post, the vibration damping spring can be limited through the guide post, the straight pipe can be supported through the vibration damping spring, the kinetic energy of the straight pipe can be absorbed, the straight pipe is not easy to vibrate when the foam liquid and the compressed air pass through the straight pipe, the stability is good.

Adopt energy storage spring supporting piston, can the energy storage, can lead to and spacing the piston through the energy storage pipe, when carrying compressed air through the intake pipe, atmospheric pressure is unstable, when leading to atmospheric pressure to rise steeply, gas can exert pressure to the piston, the piston receives pressure and can transmits pressure to energy storage spring, can compress energy storage spring, thereby can absorb the impact force that increases the atmospheric pressure steeply, can provide the buffering to the pipeline, the pipeline is difficult damaged, when the inside atmospheric pressure of intake pipe resumes to the ordinary pressure, can stop exerting pressure to the piston, energy storage spring can promote the piston and reset.

Furthermore, the number of the energy storage mechanisms (6) is two, and the two energy storage mechanisms are respectively positioned on the same side or different sides of the air inlet pipe (2).

Furthermore, the two buffer mechanisms (7) are respectively positioned at the same side or different sides of the straight pipe (3).

Furthermore, a perforated plate 31 is fixed in the straight pipe (3).

Further, the air mixer further comprises a shell (8), the straight pipe (3), the first taper pipe (4), the second taper pipe (5), the energy storage mechanism (6) and the buffer mechanism (7) are all located in the shell (8), the inlet ends of the liquid inlet pipe (1) and the air inlet pipe (2) are led out from the shell (8) to be connected with external equipment, and the outlet end of the straight pipe (3) is led out from the shell (8) to be connected with the external equipment.

Further, the guide sleeve (73) is fixed inside the shell (8).

Furthermore, one end of the guide post (72) far away from the guide sleeve (73) is abutted against the inner wall of the shell (8), and a rubber pad (75) is fixed on the abutting surface of the guide post (72).

Furthermore, a one-way valve (11) is also arranged on the liquid inlet pipe (1).

Furthermore, a digital display air pressure gauge (21) and a digital display hydraulic gauge (12) are respectively arranged on the air inlet pipe (2) and the liquid inlet pipe (1).

The invention also provides a compressed air foam fire extinguishing system, which comprises a foam concentrate supply system, a compressed air supply system, a foam injection system and the air mixer; the outlet end of the foam liquid supply system is connected with the inlet end of the liquid inlet pipe (1), the outlet end of the compressed air supply system is connected with the inlet end of the air inlet pipe (2), and the inlet end of the foam injection system is connected with the outlet end of the second taper pipe (5).

The invention has the advantages that:

the invention provides an air mixer for a compressed air foam fire extinguishing system, which respectively conveys foam concentrate and compressed air through a liquid inlet pipe and an air inlet pipe, when the compressed air and the foam concentrate reach a straight pipe through a first conical pipe, the foam concentrate and the compressed air reach the output end of the first conical pipe and the path becomes narrow due to different sections at two ends of the first conical pipe, the foam concentrate and the compressed air can be fully mixed under the action of high-pressure airflow in the compression process, the mixed foam concentrate reaches a porous plate of the straight pipe and can be secondarily mixed, when the foam concentrate is discharged through a second conical pipe, the path becomes wide and is in a release state, the mixing quality of the foam concentrate is improved in the compression and release processes, the fire extinguishing effect of the foam concentrate can be fully exerted, a guide pillar can be guided through a guide sleeve, a vibration damping spring can be limited through the guide pillar, the straight pipe can be supported through the vibration damping spring, and the kinetic energy of the straight pipe can be absorbed, when the foam liquid and the compressed air pass through the straight pipe, the straight pipe is not easy to vibrate and has good stability.

The invention provides an air mixer for a compressed air foam fire extinguishing system, which adopts an energy storage spring to support a piston and store energy, wherein the piston can be guided and limited through an energy storage pipe, when compressed air is conveyed through an air inlet pipe, air can exert pressure on the piston when the air pressure is unstable and rises steeply, the piston can transmit the pressure to the energy storage spring under the pressure, the energy storage spring can be compressed, so that the impact force of the steeply increased air pressure can be absorbed, a pipeline can be buffered, the pipeline is not easy to damage, the pressure application on the piston can be stopped when the air pressure in the air inlet pipe returns to normal pressure, and the energy storage spring can push the piston to reset.

The damping spring cooperates the rubber block to work together, further reduce the vibration influence.

Drawings

FIG. 1 is a schematic diagram of an air mixer for a compressed air foam fire suppression system in an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the energy storage mechanism of FIG. 1;

FIG. 3 is an enlarged schematic view of the damping mechanism of FIG. 1;

FIG. 4 is a schematic diagram of an embodiment of the present invention in which an air mixer for a compressed air foam fire suppression system includes a housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment discloses an air mixer for a compressed air foam fire extinguishing system, which comprises a liquid inlet pipe 1, an air inlet pipe 2, a straight pipe 3, a first taper pipe 4, a second taper pipe 5, an energy storage mechanism 6 and a buffer mechanism 7, wherein the straight pipe 3 is connected with the first taper pipe 4; the first taper pipe 4 is a three-way pipe, and is provided with a large-caliber end and a small-caliber end respectively, and an opening is arranged on the pipe wall of the first taper pipe 4. According to the airflow direction, an air inlet pipe 2, a first conical pipe 4, a straight pipe 3 and a second conical pipe 5 are connected in sequence; according to the flow direction of the foam liquid, a liquid inlet pipe 1, a first conical pipe 4, a straight pipe 3 and a second conical pipe 5 are connected in sequence; the small-caliber ends of the first conical pipe 4 and the second conical pipe 5 are respectively connected with the inlet end and the outlet end of the straight pipe 3.

As shown in fig. 2, the energy storage mechanism 6 includes a blind pipe 61, a piston 62, a pressure spring 63, and an opening on the pipe wall of the air inlet pipe 2, an inlet of the blind pipe 61 is fixed with the opening in a sealing manner, an inner cavity of the blind pipe 61 is communicated with an inner cavity of the air inlet pipe 2, the piston 62 is limited in the blind pipe 61, and the pressure spring 63 is limited between the piston 62 and the bottom wall of the blind pipe 61; in this embodiment, the compression spring 63 is generally a spring.

As shown in fig. 3, the buffer mechanism 7 includes a positioning ring 71, a guide post 72, a guide sleeve 73, and a damper spring 74; the periphery of the positioning ring 71 is provided with a limiting groove, the straight pipe 3 is limited in the limiting groove, the positioning ring 71 is fixed on the guide post 72, and the guide post 72 is sleeved with the damping spring 74; one end of the guide post 72 is limited in the guide sleeve 73 and is in sliding fit with the guide sleeve 73, and the damping spring 74 is limited between the positioning ring 71 and the guide sleeve 73; the guide sleeve 73 is fixed in position.

In this embodiment, the two energy storage mechanisms 6 are respectively located on the same side or different sides of the air inlet pipe 2, so as to improve the pressure variation capability of the strain gas.

In this embodiment, two buffering mechanisms 7 are respectively located on the same side or different sides of the straight pipe 3 to ensure the buffering effect.

In order to ensure sufficient mixing of the foam concentrate, a perforated plate 31 is also fixed in the straight pipe 3. After entering the straight pipe 3, the foam liquid is further dispersed and mixed through the porous plate 31, so that the mixing effect is improved.

As shown in fig. 4, in order to make the structure of the air mixer more stable and reliable, the present embodiment is further provided with a housing 8, the housing 8 can be made by welding stainless steel plates, and is generally of a cubic structure, and a protection door 81 is opened at the front side, so as to facilitate checking and maintaining the condition of each component located in the housing 8. Straight tube 3, first taper pipe 4, second taper pipe 5, energy storage mechanism 6, buffer gear 7 all are located shell 8, and the entrance point of feed liquor pipe 1, intake pipe 2 is drawn forth from 8 diapalls of shell and is connected with external equipment, and the exit end of straight tube 3 is drawn forth from 8 roof of shell, is connected with external equipment, generally with the pipe connection of foam spray gun. The guide sleeve 73 is fixed inside the housing 8. The end of the guide post 72 away from the guide sleeve 73 is abutted against the inner wall of the housing 8, and a rubber pad 75 is fixed on the abutting surface to reduce vibration noise. For the convenience of quick connection, this embodiment is located the outside mouth of pipe of shell 8 at feed liquor pipe 1, intake pipe 2, straight tube 3 and installs quick-operation joint 9, can realize being connected with external equipment fast.

In this embodiment, a check valve 11 is further installed on the liquid inlet pipe 1, and the check valve 11 is arranged in the shell 8. The air inlet pipe 2 and the liquid inlet pipe 1 are respectively provided with a digital display air pressure gauge 21 and a digital display hydraulic gauge 12, and the digital display air pressure gauge 21 and the digital display hydraulic gauge 12 are positioned outside the shell 8 and are convenient to check in real time.

Example 2

The embodiment discloses a compressed air foam fire extinguishing system, which comprises a foam concentrate supply system, a compressed air supply system, a foam injection system and the air mixer in the embodiment 1; the outlet end of the foam liquid supply system is connected with the inlet end of the liquid inlet pipe 1, the outlet end of the compressed air supply system is connected with the inlet end of the air inlet pipe 2, and the inlet end of the foam injection system is connected with the outlet end of the second taper pipe 5.

The working principle is as follows:

the foam liquid and the compressed air are respectively conveyed by a worker through the liquid inlet pipe 1 and the air inlet pipe 2, when the compressed air and the foam liquid reach the straight pipe 3 through the first conical pipe 4, the foam liquid and the compressed air reach the output end of the first conical pipe 4 and the path becomes narrow due to different sections of two ends of the first conical pipe 4, the foam liquid and the compressed air are in a compression process and can be fully mixed under the action of high-pressure airflow, and the foam liquid can be prevented from being refilled by the check valve 11 between the guide pipe and the liquid inlet pipe 1;

the mixed foam liquid reaches the perforated plate 31 of the straight pipe 3, can be mixed secondarily through the plate holes of the perforated plate 31, and is discharged through the second conical pipe 5, the path is widened and is in a release state, so that the mixing quality of the foam liquid can be improved in the compression and release processes;

when foam liquid and compressed air pass through straight tube 3, damping spring 74 can support straight tube 3, and damping spring 74 cooperates the combined work of block rubber 9, can absorb the kinetic energy of straight tube 3, and straight tube 3 is difficult for vibrating, and stability is good, can lead to guide pillar 72 through guide pin bushing 73, can be spacing damping spring 74 through guide pillar 72.

The energy storage spring is adopted to support the piston 62 and store energy, when compressed air is conveyed through the air inlet pipe 2, air can exert pressure on the piston 62 when the air pressure is unstable and increases steeply, the piston 62 can transmit the pressure to the energy storage spring under the pressure, and the energy storage spring can be compressed, so that the impact force of the steeply increased air pressure can be absorbed, and the pipeline can be buffered;

when the air pressure in the air inlet pipe 2 is recovered to the normal pressure, the pressure applied to the piston 62 can be stopped, the energy storage spring pushes the piston 62 to reset, in the process, the energy storage pipe can guide and limit the piston 62, and the piston 62 is not prone to tilting;

the staff opens digital display hydraulic pressure gauge 12 switch and digital display barometer 21 switch respectively, can monitor the inside hydraulic pressure of feed liquor pipe 1 and the inside atmospheric pressure of intake pipe 2 respectively through digital display hydraulic pressure gauge 12 and digital display barometer 21.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.