Large-flow compressed air foam fire fighting truck

Abstract

The utility model discloses a large-flow compressed air foam fire truck which comprises a chassis, a front box, a containing tank, a pump room, an auxiliary girder, a transmission system, a fire monitor and a compressed air foam system, and the compressed air foam system comprises an air compressor unit, a fire pump, a foam pump unit, a mixer and an electric control unit. An air compressor unit in the compressed air foam system is arranged in a front box to form a front box module, other parts, except the air compressor unit, in the compressed air foam system are arranged in a pump room, and a fire pump in the compressed air foam system is connected with a power takeoff of the chassis power system through a transmission system. The compressed air foam fire fighting truck provided by the utility model can realize large flow and large liquid carrying capacity, is strong in fire extinguishing capacity, and can meet the fighting requirements of heavy and extra-large petroleum, chemical and high-rise fire disasters, extra-high voltage converter transformer substations and other large-scale fire disasters.

Description

Technical Field

[0001] The utility model relates to a large-flow compressed air foam fire truck, belonging to the technical field of compressed air foam fire trucks. Background Art

[0002] A compressed air foam fire truck refers to a fire truck that uses compressed air foam for fire extinguishing. A fire truck is provided with a storage tank and a compressed air foam system. Among them, the storage tank includes an A-class foam tank storing A-class foam, a B-class foam tank storing B-class foam, and a water tank storing pure water. The compressed air foam system includes an air compressor unit, a fire pump, a foam pump unit, a mixer, and an electronic control unit. The air compressor unit includes an air compressor, an air compressor engine, and a fuel tank. The foam pump unit includes a foam pump and a foam pump power device. The storage tank, the air compressor unit, the fire pump, the foam pump unit, and the mixer are connected by pipelines. The electronic control unit is used to control the normal operation of the compressed air foam system. During operation, the water in the water tank enters the mixer through the pipeline under the action of the fire pump. The A-class foam in the A-class foam tank or the B-class foam in the B-class foam tank enters the mixer through the pipeline under the action of the foam pump. The compressed air generated by the air compressor unit enters the mixer through the pipeline. Water, foam, and compressed air are mixed in the mixer to form compressed air foam (i.e., CAF fire extinguishing agent). The formed compressed air foam is transported to an external ejector (such as a foam gun, a fire monitor, etc.) and ejected through the ejector for fire extinguishing.

[0003] For the existing compressed air foam fire trucks, the compressed air foam system is integrally installed in the pump room of the fire truck, resulting in limited layout space for the fire truck, making the power of the air compressor unit, the foam pump unit, etc. in the compressed air foam system relatively small, thus resulting in a small flow rate of the fire truck and limited fire extinguishing ability. It is only suitable for small fires. For large fires, multiple such compressed air foam fire trucks need to be configured simultaneously to extinguish the fire, having defects such as low fire fighting and rescue efficiency and high costs. Therefore, there is an urgent need in this field to develop a large-flow compressed air foam fire truck that can be directly applicable to large fires. Summary of the Utility Model

[0004] Aiming at the above problems and requirements existing in the prior art, the purpose of the utility model is to provide a large-flow compressed air foam fire truck that can be directly applicable to large fires.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A large-flow compressed air foam fire truck, comprising a chassis, a front box, a tank, a pump house, a secondary girder, a transmission system, a fire cannon and a compressed air foam system. The tank includes an A-class foam tank, a B-class foam tank and a water tank. The compressed air foam system includes an air compressor unit, a fire pump, a foam pump unit, a mixer and an electronic control unit for controlling the automatic operation of the compressed air foam system. The air compressor unit includes an air compressor, an air compressor engine and a fuel tank. The foam pump unit includes a foam pump and a foam pump power device. The compressed air outlet of the air compressor unit is connected to the air inlet of the mixer through a pipeline. The foam outlets of the A-class foam tank and the B-class foam tank are respectively connected to the inlets of the foam pumps through pipelines. The outlet of the foam pump is connected to the foam inlet of the mixer through a pipeline. The water outlet of the water tank is connected to the water inlet of the fire pump through a pipeline. The water outlet of the fire pump is connected to the water inlet of the mixer through a pipeline. The mixed liquid outlet of the mixer is connected to the fire cannon through a pipeline. The air compressor unit in the compressed air foam system is arranged in the front box to form a front box module, and the rest of the compressed air foam system except the air compressor unit is arranged in the pump house. The fire pump in the compressed air foam system is connected to the power take-off of the chassis power system through the transmission system.

[0007] An implementation scheme, the compressed air foam system includes at least two foam pumps, and at least two foam pumps form a foam pump group. The foam outlets of the A-class foam tank and the B-class foam tank are respectively connected to the inlets of each foam pump in the foam pump group through pipelines.

[0008] An implementation scheme, an external suction pipeline for the foam pump is connected to the inlet of the foam pump group, and the foam pump group is externally connected to a foam source or a foam liquid barrel or other foam tanks through the external suction pipeline for the foam pump.

[0009] An implementation scheme, an external suction pipeline for the fire pump is connected to the water inlet of the fire pump, and the fire pump is externally connected to a water source through the external suction pipeline for the fire pump.

[0010] An implementation scheme, a return water pipeline is connected to the water outlet of the fire pump, and the water outlet of the fire pump is connected to the water tank through the return water pipeline.

[0011] An implementation scheme, a plurality of external pipelines for foam guns and a plurality of external pipelines for elevated platform fire cannons are connected to the mixed liquid outlet of the mixer.

[0012] An implementation scheme, the fire cannon includes a fire cannon body and a cannon head. The cannon head includes a water cannon head and a telescopic cannon head. The fire cannon body is installed outside the top of the tank at the tank location. The water cannon head and the telescopic cannon head are both detachable and can be installed on the fire cannon body interchangeably. The water inlet of the fire cannon is connected to the mixed liquid outlet of the mixer and the water outlet of the fire pump respectively through pipelines.

[0013] An implementation scheme, the interior of the front box has a chamber capable of accommodating an air compressor unit, and the top of the chamber is open; there are symmetrically arranged notches at the lower parts of the front and rear sides of the front box, and symmetrically arranged wheel arches at the lower parts of the left and right sides of the front box; a fuel filling port is provided at the left or right side of the air compressor box body, and the fuel filling port is communicated with the fuel tank filling port in the air compressor box body through an oil pipe. A hook ladder seat for hanging a hook ladder is fixedly provided at the side of the front box facing the fuel filling port; moreover, a detachable top cover is provided at the top of the front box, a detachable maintenance door is provided at the rear of the top cover, a maintenance access opening is provided at the position corresponding to the maintenance door at the top of the front box, and a maintenance chamber communicated with the chamber is provided at the rear of the front box.

[0014] A preferred scheme, an armrest is provided at the front side of the front box.

[0015] An implementation scheme, the front box includes a front box skeleton, a sealing plate and a skirt plate. The chamber and the maintenance chamber are arranged at the upper part of the front box skeleton, the notches and the wheel arches are arranged at the lower part of the front box skeleton, the sealing plate is arranged at the left and right sides of the maintenance chamber, and the skirt plate is arranged at the peripheral side of the lower part of the front box skeleton.

[0016] A preferred scheme, the left and right sides of the chamber are communicated with each other.

[0017] A preferred scheme, assembly gap shielding plates are provided on both the left and right sides of the chamber.

[0018] A preferred scheme, a plurality of lifting rings are provided at the top of the top cover.

[0019] An implementation scheme, fixing angle members are respectively provided at the four corners of the top cover.

[0020] An implementation scheme, parapets are provided at both the left and right ends of the top cover.

[0021] An implementation scheme, a connecting beam for connecting with the top cover is provided at the top of the front box skeleton.

[0022] An implementation scheme, fixing angle members are respectively provided at the four corners of the top of the front box skeleton.

[0023] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0024] The compressed air foam fire truck provided by the present utility model realizes large flow and large liquid loading capacity through the ingenious design of the structure and layout. The CAF fire extinguishing agent flow rate of the fire fighting cannon can reach more than 21,600 L / min, and the fire extinguishing ability is strong, which can directly meet the high-efficiency fire fighting requirements for large-scale fires such as heavy and super heavy oil, chemical industry, high-rise building fires, and ultra-high voltage converter substations, and the practical value is remarkable. Description of the Drawings

[0025] Figure 1 It is a structural schematic diagram of a large-flow compressed air foam fire truck provided by an embodiment of the present utility model;

[0026] Figure 2 It is a working principle block diagram of the large-flow compressed air foam fire truck described in the embodiment of the present utility model;

[0027] Figure 3 It is a structural schematic diagram of the fire cannon body described in the embodiment of the present utility model;

[0028] Figure 4 It is a state diagram when the muzzle of the fire cannon described in the embodiment of the present utility model is a water cannon muzzle;

[0029] Figure 5 It is a state diagram when the muzzle of the fire cannon described in the embodiment of the present utility model is a bamboo joint muzzle;

[0030] Figure 6 It is a structural schematic diagram of the front box module described in the embodiment of the present utility model, where the top cover, the sealing plate, and the assembly gap baffle are not shown in the figure;

[0031] Figure 7 It is a front view of the front box module described in the embodiment of the present utility model;

[0032] Figure 8 It is a three-dimensional structural schematic diagram of the front box frame described in the embodiment of the present utility model;

[0033] Figure 9 It is a structural schematic diagram of the air compressor unit described in the embodiment of the present utility model;

[0034] Figure 10 It is a structural schematic diagram of the top cover described in the embodiment of the present utility model;

[0035] Figure 11 It is a state diagram when the front box module is used in a large-flow compressed air foam fire truck in the embodiment of the present utility model;

[0036] Figure 12 It is a structural schematic diagram of an existing air compressor unit;

[0037] The reference numerals in the figure are indicated as follows:

[0038] 1. Chassis; 2. Front box; 21. Front box skeleton; 22. Sealing plate; 23. Skirt board; 2-1. Chamber; 2-2. Notch; 2-3. Wheel arch; 2-4. Hook ladder base; 2-5. Top cover; 2-51. Inspection door; 2-52. Hoisting ring; 2-53. Fixed angle piece on the top cover; 2-54. Parapet wall; 2-6. Inspection access; 2-7. Inspection room; 2-8. Handrail; 2-9. Assembly gap baffle; 2-10. Connecting beam; 2-11. Fixed angle piece on the front box skeleton; 3. Tank; 31. Class A foam tank; 32. Class B foam tank; 33. Water tank; 4. Pump room; 5. Sub-girder; 6. Transmission system; 7. Fire cannon; 71. Fire cannon body; 72. Water cannon head; 73. Telescopic cannon head; 8. Air compressor unit; 81. Air compressor box body; 82. Fuel tank; 821. Fuel tank filling port; 83. Filling port; 84. Oil pipe; 9. Fire pump; 10. Mixer; 11. Foam pump; 12. Power take-off of the chassis power system; 13. Hook ladder

[0039] 8'. Existing air compressor unit; 81'. Air compressor box body of the existing air compressor unit; 82'. Fuel tank of the existing air compressor unit; 83'. Existing filling port Detailed implementation mode

[0040] The technical solution of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. In addition, it should be noted that the terms used in the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. Unless otherwise defined, the technical terms or scientific terms used in the present utility model should be the generally understood meanings by those with ordinary skills in the art. The orientation or positional relationships indicated by the terms "inside", "outside", "above", "below", "top", "bottom", "front", "rear", "left", "right", etc. are all based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "set", "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should also be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there can also be an intermediate element

[0041] Embodiment

[0042] Please combine Figure 1 and Figure 2As shown: A large-flow compressed air foam fire truck provided in this embodiment includes a chassis 1, a front box 2, a storage tank 3, a pump house 4, a secondary girder 5, a transmission system 6, a fire cannon 7, and a compressed air foam system. The storage tank 3 includes an A-class foam tank 31, a B-class foam tank 32, and a water tank 33. The compressed air foam system includes an air compressor unit 8, a fire pump 9, a foam pump unit, a mixer 10, and an electronic control unit for controlling the automatic operation of the compressed air foam system (the electronic control unit belongs to well-known technology, Figure 1 and Figure 2 the electronic control unit is omitted in the text). The air compressor unit 8 includes an air compressor, an air compressor engine, and a fuel tank 82 (the air compressor and the air compressor engine belong to well-known technology, Figure 9 the air compressor and the air compressor engine are not shown in the text). The foam pump unit includes a foam pump 11 and a foam pump power device (the foam pump power device belongs to well-known technology, Figure 2 the foam pump power device is omitted in the text); The compressed air outlet of the air compressor unit 8 is connected to the air inlet of the mixer 10 through a pipeline. The foam outlets of the A-class foam tank 31 and the B-class foam tank 32 are respectively connected to the inlets of the foam pump 11 through pipelines. The outlet of the foam pump 11 is connected to the foam inlet of the mixer 10 through a pipeline. The water outlet of the water tank 33 is connected to the water inlet of the fire pump 9 through a pipeline. The water outlet of the fire pump 9 is connected to the water inlet of the mixer 10 through a pipeline. The mixed liquid outlet of the mixer 10 is connected to the fire cannon 7 through a pipeline. The air compressor unit 8 in the compressed air foam system is arranged in the front box 2 to form a front box module. The rest of the compressed air foam system except the air compressor unit 8 is arranged in the pump house 4. The fire pump 9 in the compressed air foam system is connected to the power take-off 12 (not shown in the figure) of the chassis power system through the transmission system.

[0043] Please refer to Figure 1 and Figure 2 shown, the usage method of the large-flow compressed air foam fire truck of the present utility model is as follows:

[0044] Drive the fire truck to the fire site where fire extinguishing is required, turn on the power supply of the superstructure, adjust the chassis engine to idle speed, then turn on the electronic control unit of the compressed air foam system, open the tank outlet valve, engage the power take-off, and hold the throttle button to adjust the speed of the fire pump, so that the water in the water tank 33 enters the mixer 10 through the pipeline under the action of the fire pump 9 at an appropriate pressure and flow rate; Class A foam in the Class A foam tank 31 or Class B foam in the Class B foam tank 32 enters the mixer 10 through the pipeline under the action of the foam pump 11; Start the air compressor, and the compressed air generated by the air compressor in the air compressor unit 8 enters the mixer 10 through the pipeline; Water, foam, and compressed air are mixed in the mixer 10 to form compressed air foam (i.e., CAF fire extinguishing agent), adjust the foam ratio, and the compressed air foam of the required ratio is transported to the fire monitor 7 and sprayed out through the fire monitor 7 for fire extinguishing; During use, select the foam in the corresponding type of foam tank according to the type of fire; When the fire is a Class A fire, Class A foam in the Class A foam tank 31 enters the mixer 10 through the pipeline under the action of the foam pump 11; When the fire is a Class B fire, Class B foam in the Class B foam tank 32 enters the mixer 10 through the pipeline under the action of the foam pump 11; In this way, the fire truck can meet the fire extinguishing requirements for Class A / B fires;

[0045] In addition, according to the actual situation of the fire, water or compressed air foam liquid can also be selected for fire extinguishing. Specifically: When extinguishing the fire with water, turn off the foam pump unit and the air compressor unit 8, so that the water in the water tank 33 enters the mixer 10 through the pipeline under the action of the fire pump 9 and is finally sprayed out through the fire monitor 7 for water fire extinguishing; When extinguishing the fire with compressed air foam liquid, start the air compressor unit 8, the compressed air generated by the air compressor in the air compressor unit 8 enters the mixer 10 through the pipeline, the water in the water tank 33 enters the mixer 10 through the pipeline under the action of the fire pump 9, Class A foam in the Class A foam tank 31 or Class B foam in the Class B foam tank 32 enters the mixer 10 through the pipeline under the action of the foam pump 11, and compressed air, water, and Class A / B foam are mixed in the mixer 10 to form compressed air foam liquid, which is finally sprayed out through the fire monitor 7 for foam fire extinguishing.

[0046] According to the utility model, the air compressor unit 8 in the compressed air foam system is separately arranged in the front box 2 to form a front box module, and the rest of the compressed air foam system except the air compressor unit 8 (including the fire pump 9, the foam pump unit, the mixer 10 and the electronic control unit) are all arranged in the pump room 4. This design can make full use of the vehicle space of the fire truck and the layout is more reasonable. The air compressor unit 8 is an independent module, so that the related equipment in the air compressor unit 8 (air compressor, air compressor engine, etc.) can all use large-volume and high-power equipment, so that the air compressor unit 8 can achieve sufficient power and can generate a large flow of compressed air; in addition, the fire pump 9 is connected to the power take-off 12 of the chassis power system through the transmission system, so that the power take-off 12 of the chassis power system of the fire truck can provide the fire pump 9 separately. Power, so that the fire pump 9 can achieve sufficient power. At the same time, by configuring a high-power foam pump power system, the foam pump unit can achieve sufficient power, so that the fire pump 9 and the foam pump unit can respectively deliver a large flow of water and foam to the mixer 10, and finally the compressed air foam system can produce a large flow of compressed air foam. When extinguishing a fire, a large flow of compressed air foam is delivered to the fire monitor 7, so that the CAF fire extinguishing agent flow of the fire monitor 7 can reach more than 21600L / min (when a mixed liquid is used for fire extinguishing, the mixed liquid flow can reach more than 3600L / min). The fire extinguishing ability is strong, so there is no need to dispatch multiple small compressed air foam vehicles, and the needs of fighting large-scale fires such as major petroleum, chemical, high-rise fires, and ultra-high voltage converter substations can be met, and the practical value is significant.

[0047] In this embodiment, the compressed air foam system includes at least two foam pumps 11, and at least two foam pumps 11 form a foam pump group. The foam outlets of the class A foam tank 31 and the class B foam tank 32 are respectively connected to the inlet of each foam pump 11 in the foam pump group through pipelines. The number of foam pumps 11 can be adjusted according to actual usage. In this embodiment, Figure 2 As shown, four foam pumps 11 are provided, and the four foam pumps 11 constitute a foam pump group. When in use, the Class A foam in the Class A foam tank 31 or the Class B foam in the Class B foam tank 32 enters the mixer 10 through the pipeline under the action of the foam pump group, so that the foam liquid delivery flow is large, thereby enabling the fire truck to achieve a large flow and a large liquid load.

[0048] In this embodiment, see Figure 2 As shown, the inlet of the foam pump group is connected to a foam pump external suction pipeline, and the foam pump group is connected to an external foam source or a foam liquid barrel or other foam tank through the foam pump external suction pipeline. When the Class A foam in the Class A foam tank 31 or the Class B foam in the Class B foam tank 32 in the fire truck is insufficient, the corresponding foam source can be sucked out through the foam pump external suction pipeline to supplement the foam.

[0049] In this embodiment, see Figure 2As shown, the water inlet of the fire pump 9 is connected to an external suction pipeline of the fire pump, and the fire pump 9 is externally connected to a water source through the external suction pipeline of the fire pump. When the water in the water tank 33 of the fire truck is insufficient, water can be sucked through the external suction pipeline of the fire pump to supplement the fire-fighting water.

[0050] In this embodiment, please refer to Figure 2 As shown, the water outlet of the fire pump 9 is connected to a return water pipeline, and the water outlet of the fire pump 9 is connected to the water tank 33 through the return water pipeline for return water operation.

[0051] In this embodiment, please refer to Figure 2 As shown, the mixed liquid outlet of the mixer 10 is connected to a number of external pipelines for foam guns and a number of external pipelines for elevated platform fire monitors of fire trucks. The number of external pipelines for foam guns and external pipelines for elevated platform fire monitors of fire trucks can be adjusted according to the usage requirements. For example, four external pipelines for foam guns and four external pipelines for elevated platform fire monitors of fire trucks are respectively provided, which can be used to externally connect four foam guns and four elevated platform fire monitors of fire trucks. By externally connecting a foam gun through the external pipeline for the foam gun, the fire truck can select a foam gun to spray fire-fighting liquid according to the actual fire situation. By externally connecting an elevated platform fire monitor of a fire truck through the external pipeline for the elevated platform fire monitor of a fire truck, the fire truck can cooperate with other elevated platform fire trucks for fire fighting, thereby effectively improving the applicable range of fire fighting. Specifically: in case of a normal fire, the fire monitor 7 is used for fire fighting; in case of a small fire, the fire monitor 7 is closed, and the corresponding foam gun is connected through the external pipeline for the foam gun, and the fire is extinguished by the foam gun; in case of a fire in a high-rise building or a large power grid, a large oil storage tank, etc., the fire monitor 7 is closed, and an elevated platform fire monitor of a fire truck is externally connected through the external pipeline for the elevated platform fire monitor of a fire truck, and the elevated platform fire monitor of a fire truck is used for high-rise fire fighting operations.

[0052] In this embodiment, please combine with Figures 3 to 5As shown in the figure, the fire monitor 7 includes a fire monitor body 71 and a nozzle head. The nozzle head includes a water monitor nozzle head 72 and a telescopic nozzle head 73. The fire monitor body 71 is installed outside the top of the tank 3 at the container tank. The water monitor nozzle head 72 and the telescopic nozzle head 73 are both detachable and can be installed on the fire monitor body 71 interchangeably. The water inlet of the fire monitor 7 is connected to the mixed liquid outlet of the mixer 10 and the water outlet of the fire pump 9 through pipelines. Currently, large compressed air foam fire trucks usually adopt a dual-fire-monitor design. One is a fire monitor for pure water, and the other is a fire monitor for foam. Generally, such dual-fire-monitors are equipped with a lifting arm, and the fire monitor is installed at the end of the lifting arm. The boom of the lifting arm, the attached hydraulic system and the support legs take up a large amount of vehicle space, resulting in a significant reduction in the liquid loading capacity of the liquid tank 3 of the fire truck, so that the fire truck cannot meet the requirements of large liquid loading capacity and large flow rate, and cannot directly meet the needs of extinguishing large-scale fires. In this embodiment, since the water monitor nozzle head 72 and the telescopic nozzle head 73 can be used interchangeably, according to the type of actual fire, only the corresponding nozzle head needs to be selected. Specifically, when a fire requires pure water extinguishing, the water monitor nozzle head 72 is installed on the fire monitor body 71 to form a water monitor for pure water to extinguish the fire; when a fire requires foam (foam liquid or compressed air foam) extinguishing, the telescopic nozzle head 73 is installed on the fire monitor body 71 to form a foam monitor for foam extinguishing. Thus, in this embodiment, only a single fire monitor 7 has the dual functions of a pure water fire monitor and a foam fire monitor. It not only has a wide range of applications, but also can effectively reduce the occupied space of the fire monitor compared with the traditional dual-fire-monitor design, thereby effectively increasing the liquid loading capacity of the fire truck, enabling the fire truck to achieve large liquid loading capacity and large flow rate.

[0053] In this embodiment, please refer to Figures 6 to 11 As shown in the figure, the interior of the front box 2 has a chamber 2-1 capable of accommodating the air compressor unit 8. The top of the chamber 2-1 is open. The lower parts of the front and rear sides of the front box 2 are symmetrically provided with notches 2-2, and the lower parts of the left and right sides of the front box 2 are symmetrically provided with wheel arches 2-3; an oil filling port 83 is provided on the left or right side of the air compressor box body 81. The oil filling port 83 is connected to the fuel tank oil filling port 821 inside the air compressor box body 81 through an oil pipe 84. A hook ladder seat 2-4 for hanging the hook ladder 13 is fixedly provided on the side of the front box 2 facing the oil filling port 83; and, a detachable top cover 2-5 is provided on the top of the front box 2. A detachable inspection door 2-51 is provided at the rear of the top cover 2-5. An inspection access port 2-6 is provided at a position corresponding to the inspection door 2-51 on the top of the front box 2. An inspection chamber 2-7 communicating with the chamber 2-1 is provided at the rear of the front box 2.

[0054] The front box 2 includes a front box frame 21, a sealing plate 22 and a skirt plate 23. The chamber 2-1 and the maintenance room 2-7 are arranged at the upper part of the front box frame 21. The notch 2-2 and the wheel arch 2-3 are arranged at the lower part of the front box frame 21. The sealing plate 22 is arranged on the left and right sides of the maintenance room 2-7. The skirt plate 23 is arranged on the peripheral side of the lower part of the front box frame 21.

[0055] The usage method of the front box module in this embodiment is as follows:

[0056] Please refer to Figure 11 As shown, the notches 2-2 on the front and rear sides of the front box 2 are clamped and installed on the auxiliary girder 5 of the fire truck. Then, the air compressor unit 8 is hoisted into the chamber 2-1 through the opening at the top of the front box 2, and then the top cover 2-5 is installed.

[0057] When refueling the fuel tank 82 of the air compressor unit 8, since the fuel filling port 83 is arranged on the left or right side of the air compressor box body 81 (in this embodiment, the left side is taken as an example in the figure, but it can be the right side), and the fuel filling port 83 is communicated with the fuel tank filling port 821 in the air compressor box body 81 through a fuel pipe 84 (please refer to Figure 9 As shown), and at the same time, a hook ladder seat 2-4 for hanging the hook ladder 13 is fixedly arranged on the side of the front box 2 facing the fuel filling port 83. Therefore, the fireman only needs to connect the hook ladder 13 with the hook ladder seat 2-4, and then climb onto the hook ladder 13 to refuel the fuel tank 82 located in the air compressor box body 81, without having to flip the cab and enter the front box for refueling operation. When refueling is completed, the hook ladder 13 is removed and hung on the rear of the fire truck, which has the advantages of convenient refueling and good safety;

[0058] When maintenance operations need to be carried out on the air compressor unit 8, since there is an openable maintenance door 2-51 on the top cover 2-5, a maintenance access port 2-6 is arranged at the position corresponding to the maintenance door 2-51 on the top of the front box 2, and a maintenance room 2-7 communicating with the chamber 2-1 is arranged at the rear of the front box 2. Therefore, the fireman does not need to remove the top cover 2-5 as a whole. Only need to open the maintenance door 2-51 on the top cover 2-5 and enter the maintenance room 2-7 through the maintenance access port 2-6 to carry out maintenance operations on the air compressor unit 8, which has the advantages of convenient maintenance, large operation space and good safety.

[0059] In the existing air compressor unit 8', since the fuel tank 82' is installed inside the air compressor box body 81', the fuel filling port of the fuel tank 82' itself is the fuel filling port 83' of the air compressor unit, resulting in the fuel filling port 83' of the air compressor unit being arranged inside the air compressor box body 81' (please refer to Figure 12As shown in the figure, when refueling the fuel tank 82' of the air compressor unit 8' inside the front compartment, the firefighters must tilt the cab of the chassis 1 to perform the refueling operation. Tipping the cab and retracting the cab both delay the fire fighting operation time. Moreover, after getting on and off the cab, the firefighters are prone to standing unsteadily, which not only makes refueling inconvenient but also poses a safety hazard. In addition, for the existing compressed air foam fire truck, the front compartment is provided with a maintenance cabin at the front, and the top cover of the front compartment is integrated. When performing daily maintenance, the entire top cover needs to be removed to enter the maintenance cabin of the front compartment, and the top cover needs to be reinstalled after the maintenance is completed, which has the defect of time-consuming and laborious maintenance.

[0060] As a preferred solution, a handrail 2-8 is provided on the front side of the front compartment 2. In this way, when the firefighters perform the refueling operation, by grasping the handrail 2-8, it is convenient to stand on a high place for the refueling operation, which can enhance safety.

[0061] As a preferred solution, the left and right sides of the chamber 2-1 are through, which is beneficial to the heat dissipation of the air compressor unit 8.

[0062] As a preferred solution, on the left and right sides of the chamber 2-1, there are respectively provided detachable assembly gap baffle plates 2-9 for covering the assembly gap between the air compressor unit 8 and the front compartment 2 (please refer to Figure 7 the figure shown) to make the overall appearance of the front compartment beautiful.

[0063] In addition, please refer to Figure 10 the figure shown. In this embodiment, several lifting rings 2-52 are provided on the top of the top cover 2-5. Through the lifting rings 2-52, it is convenient to assemble the top cover 2-5 on the top of the front compartment 2 by means of hoisting; fixed angle members 2-53 are respectively provided at the four corners of the top cover 2-5. In this way, when assembling, the fasteners (for example, screws) are passed through the mounting holes on the fixed angle members 2-53, and the top cover 2-5 can be detachably installed on the top of the front compartment 2; parapets 2-54 are provided at the left and right ends of the top cover 2-5.

[0064] In addition, please refer to Figure 8 the figure shown. In this embodiment, a connecting beam 2-10 for connecting with the top cover 2-5 is provided on the top of the front compartment frame 11. The connecting beam 2-10 is beneficial to the stable connection between the top cover 2-5 and the front compartment frame 11. In this way, when assembling, the connecting beam 2-10 is directly detachably installed on the top of the front compartment frame 11 through fasteners (for example, screws); fixed angle members 2-11 are respectively provided at the four corners of the top of the front compartment frame 11. Through the fixed angle members 2-11 combined with fasteners, the detachable connection between the front compartment frame 11 and the connecting beam 2-10 can be realized.

[0065] Finally, it is necessary to point out here that the above description is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A large-flow compressed air foam fire truck, comprising a chassis, a front box, a container, a pump room, a secondary beam, a transmission system, a fire monitor and a compressed air foam system, wherein the container comprises a Class A foam tank, a Class B foam tank and a water tank, the compressed air foam system comprises an air compressor unit, a fire pump, a foam pump unit, a mixer and an electronic control unit for controlling the automatic operation of the compressed air foam system, the air compressor unit comprises an air compressor, an air compressor engine and a fuel tank, the foam pump unit comprises a foam pump and a foam pump power device, the compressed air outlet of the air compressor unit is connected to the air inlet of the mixer through a pipeline, the foam outlets of the Class A foam tank and the Class B foam tank are respectively connected to the inlet of the foam pump through pipelines, the outlet of the foam pump is connected to the foam inlet of the mixer through a pipeline, the water outlet of the water tank is connected to the water inlet of the fire pump through a pipeline, the water outlet of the fire pump is connected to the water inlet of the mixer through a pipeline, and the mixed liquid outlet of the mixer is connected to the fire monitor through a pipeline; characterized in that: The air compressor unit in the compressed air foam system is arranged in the front box to form a front box module. The remaining parts of the compressed air foam system except the air compressor unit are arranged in the pump room. The fire pump in the compressed air foam system is connected to the power take-off of the chassis power system through a transmission system.

2. The large-flow compressed air foam fire truck according to claim 1 is characterized in that: The compressed air foam system includes at least two foam pumps, which form a foam pump group. The foam outlets of the Class A foam tank and the Class B foam tank are respectively connected to the inlet of each foam pump in the foam pump group through pipelines.

3. The large flow compressed air foam fire truck according to claim 1, characterized in that: The mixed liquid outlet of the mixer is connected with a plurality of foam gun external pipes and a plurality of aerial vehicle fire monitor external pipes.

4. The large-flow compressed air foam fire truck according to claim 1, characterized in that: The fire monitor includes a fire monitor body and a monitor head, and the monitor head includes a water monitor head and a bamboo monitor head. The fire monitor body is installed on the outside of the tank top at the container tank, and the water monitor head and the bamboo monitor head are both detachable and can be installed on the fire monitor body replaceably. The water inlet of the fire monitor is respectively connected to the mixed liquid outlet of the mixer and the water outlet of the fire pump through a pipeline.

5. The large flow compressed air foam fire truck according to claim 1, characterized in that: The interior of the front box has a chamber that can accommodate an air compressor unit, and the top of the chamber is open; notches are symmetrically provided at the lower front and rear sides of the front box, and wheel eyebrows are symmetrically provided at the lower left and right sides of the front box; a refueling port is provided on the left or right side of the air compressor front box, and the refueling port is connected with the oil tank refueling port in the air compressor front box through an oil pipe, and a hook ladder seat for hanging a hook ladder is fixedly provided on the side of the front box facing the refueling port; and a detachably connected top cover is provided on the top of the front box, an openable and closable maintenance door is provided at the rear of the top cover, a maintenance entrance is provided at a position corresponding to the maintenance door on the top of the front box, and a maintenance room communicating with the chamber is provided at the rear of the front box.

6. The large-flow compressed air foam fire truck according to claim 5, characterized in that: An armrest is provided on the front side of the front box.

7. The large-flow compressed air foam fire truck according to claim 5, characterized in that: The front box includes a front box frame, a sealing plate and a skirt plate, the chamber and the inspection room are arranged at the upper part of the front box frame, the notch and the wheel arch are arranged at the lower part of the front box frame, the sealing plate is arranged on the left and right sides of the inspection room, and the skirt plate is arranged on the lower peripheral side of the front box frame.

8. The large flow compressed air foam fire fighting vehicle according to claim 5 or 7, characterized in that: The left and right sides of the chamber are interconnected.

9. The large-flow compressed air foam fire truck according to claim 8, characterized in that: The left and right sides of the chamber are both provided with assembly gap shielding plates.

10. The large-flow compressed air foam fire truck according to claim 7, characterized in that: A connecting beam for connecting with the top cover is arranged on the top of the front box frame.

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