Fire fighting truck and power system thereof

Abstract

The utility model discloses a fire fighting truck and a power system thereof. Comprising a single engine with a first power output shaft, a chassis gearbox in transmission connection with a chassis of the fire fighting truck, a water pump for fire fighting, a motor with a second power output shaft, a generator with a mechanical energy input end and a first electric energy output end, an electricity storage device and a power takeoff with a third power output shaft. In the utility model, the power of the water pump is provided by the independent electricity storage device, the driving power of the chassis comes from the engine, and the two types of power are completely independent, so that when the fire fighting truck is under the driving fire-fighting working condition, the operation of the water pump is not influenced by the rotating speed of the engine, and the working stability of the water pump can be ensured; the rescue capability of the fire fighting truck under the driving fire fighting working condition is greatly improved; as long as the engine is in a working state, the power storage device can be charged through the power takeoff, sufficient power supply of the motor can be guaranteed, power failure is not prone to occurring, and the rescue capacity of the fire fighting truck is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fire trucks, in particular to a fire truck and a power system thereof. Background Art

[0002] A fire truck is a special vehicle that combines firefighting and rescuing lives. It is a special tool used to extinguish fires. It can be put into use in time when an accident or unexpected situation occurs to ensure people's safety and property from loss.

[0003] Parking firefighting conditions and driving firefighting conditions are the most basic working modes in fire trucks, and the driving scheme of fire trucks must be able to meet the working condition requirements. In the prior art, 202111157698.4 proposes a hybrid power + power distribution fire truck driving scheme, which includes a drive motor, an electric motor / generator, and a diesel engine. It adopts a hybrid power system and can support pure electric drive, hybrid drive, two driving charging, parking charging, driving firefighting, and parking firefighting, a total of seven working modes. However, the water pump (i.e., the upper pump in the patent) power and the drive axle power (providing power for chassis driving) in the patent are output by the same dedicated power transmission box. Due to the connection through the gear set, the water pump speed and the drive axle speed will be linearly related. The output result is that when the vehicle speed changes, the water pump speed will also change synchronously. This is also the pain point of the current domestic fire trucks carrying out firefighting operations while driving. It is difficult to ensure that the water pump operates stably under the rated working conditions, which greatly reduces the rescue effect of the fire truck under driving firefighting conditions. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fire truck and a power system thereof, which can ensure the working stability of the water pump and improve the rescue capability of the fire truck under driving fire fighting conditions.

[0005] In order to solve the above technical problems, the utility model discloses a power system for a fire truck in the first aspect, comprising a single engine with a first power output shaft, a chassis gearbox connected to the chassis of the fire truck, a water pump for fire fighting, a motor with a second power output shaft, a generator with a mechanical energy input end and a first electrical energy output end, a power storage device, and a power take-off with a third power output shaft;

[0006] The first power output shaft of the engine is connected to the chassis of the fire truck through the chassis gearbox to provide power for the driving of the fire truck;

[0007] The input end of the power take-off is drivingly connected to the first power output shaft to obtain part of the power of the engine and output the power through the third power output shaft of the power take-off;

[0008] The mechanical energy input end of the generator is drivingly connected to the third power output shaft of the power take-off; the first electric energy output end of the generator is electrically connected to the charging end of the energy storage device; the discharging end of the energy storage device is electrically connected to the first power input end of the motor;

[0009] The second power output shaft of the motor is drivingly connected to the impeller shaft of the water pump to provide power for the water outlet of the water pump.

[0010] As an optional implementation manner, the generator further has a second electric energy output end, and the motor further has a second power input end; the second electric energy output end of the generator is electrically connected to the second power input end of the motor; the electric energy input by the first power input end and the second power input end of the motor jointly powers the motor.

[0011] As another optional implementation manner, the power take-off is a sandwich type power take-off or a gearbox power take-off.

[0012] As another optional implementation manner, it further includes a water pump gearbox; the input end of the water pump gearbox is drivingly connected to the second power output shaft of the motor, and the output end of the water pump gearbox is drivingly connected to the impeller shaft.

[0013] As another optional implementation manner, the water pump gearbox is a speed increasing box or a speed reducing box.

[0014] As another optional implementation manner, the energy storage device is a power battery pack.

[0015] As another optional implementation manner, the engine is a fuel engine.

[0016] The second aspect of the present invention discloses a fire truck, including the power system described in the first aspect of the present invention.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0018] In the embodiments of the present invention, the power of the water pump is provided by an independent energy storage device (i.e., electric energy), while the power for the chassis to travel comes from the engine (i.e., mechanical energy). These two powers operate completely independently. Thus, when the fire truck is in the driving and fire fighting working condition, the operation of the water pump will not be affected by the engine speed, which can ensure the stability of the water pump operation, and further greatly improve the rescue ability of the fire truck in the driving and fire fighting working condition; as long as the engine is in the working state, the energy storage device can be charged through the power take-off, which can ensure sufficient power supply for the motor and is not prone to power failure, ensuring the rescue ability of the fire truck. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The utility model is a structural schematic diagram of a fire truck and its power system disclosed in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , the embodiment of the utility model discloses a power system for a fire truck, comprising a single engine 7 having a first power output shaft, a chassis gearbox 6 drivingly connected to the chassis of the fire truck, a water pump 4 for fire fighting, a motor 5 having a second power output shaft, a generator 3 having a mechanical energy input end and a first electric energy output end, a power storage device 2, and a power take-off 1 having a third power output shaft 11;

[0023] The first power output shaft of the engine 7 is connected to the chassis of the fire truck through the chassis gearbox 6 to provide power for the driving of the fire truck;

[0024] The input end of the power take-off 1 is drivingly connected to the first power output shaft to obtain part of the power of the engine 7 and output the power through the third power output shaft 11 of the power take-off 1;

[0025] The mechanical energy input end of the generator 3 is transmission-connected to the third power output shaft 11 of the power take-off 1, the first electric energy output end of the generator 3 is electrically connected to the charging end of the power storage device 2, and the discharge end of the power storage device 2 is electrically connected to the first power input end of the motor 5;

[0026] The second power output shaft of the motor 5 is drivingly connected to the impeller shaft of the water pump 4 to provide power for the water pump 4 to discharge water.

[0027] In this embodiment, the motor 5 converts the input electrical energy into mechanical energy for the rotation of the second power output shaft; the engine 7 converts the input electrical energy into mechanical energy for the rotation of the first power output shaft; the generator 3 converts the mechanical energy obtained by the power take-off 1 into electrical energy for charging the electricity storage device 2. Figure 1 In Figure 1 , B is a drive shaft for connecting to the chassis, which can transmit the mechanical kinetic energy output by the chassis transmission 6 to the chassis.

[0028] In this embodiment, the power of the water pump 4 is provided by an independent electricity storage device 2 (i.e., electrical energy), while the power for the chassis to travel comes from the engine 7 (i.e., mechanical energy). These two powers operate completely independently. Thus, when the fire truck is in the driving and fire-fighting working condition, the operation of the water pump 4 will not be affected by the rotational speed of the engine 7, which can ensure the stability of the operation of the water pump 4, and further greatly improve the rescue ability of the fire truck in the driving and fire-fighting working condition; as long as the engine 7 is in the working state, the electricity storage device 2 can be charged through the power take-off 1, which can ensure sufficient power supply for the motor 5 and is not prone to power outages, ensuring the rescue ability of the fire truck.

[0029] Optionally, the power output of the power take-off 1 can be controlled to adjust the rotational speed of the impeller of the water pump 4. For example, for the sandwich type power take-off 1, changing the clamping force on the engine 7 can change the output power.

[0030] In an alternative embodiment, the generator 3 further has a second electrical energy output terminal, and the motor 5 further has a second power input terminal; the second electrical energy output terminal of the generator 3 is electrically connected to the second power input terminal of the motor 5; the electrical energy input to the first power input terminal and the second power input terminal of the motor 5 jointly supply power to the motor 5. In this embodiment, by directly connecting the generator 3 to the motor 5, the generator 3 and the electricity storage device 2 jointly supply power to the motor 5, which can ensure that the motor 5 can receive sufficient electrical energy.

[0031] In yet another alternative embodiment, the power take-off 1 is a sandwich type power take-off 1 or a transmission power take-off 1.

[0032] In yet another alternative embodiment, it further includes a water pump 4 transmission; the input end of the water pump 4 transmission is in transmission connection with the second power output shaft of the motor 5, and the output end of the water pump 4 transmission is in transmission connection with the impeller shaft.

[0033] In yet another alternative embodiment, the water pump 4 transmission is a speed increasing box or a speed reducing box.

[0034] In yet another alternative embodiment, the electricity storage device 2 is a power battery pack.

[0035] In yet another alternative embodiment, the engine 7 is a fuel engine 7.

[0036] In yet another alternative embodiment, a controller 8 is further included for controlling the opening and closing of the motor 5.

[0037] Embodiment 2

[0038] An embodiment of the present utility model discloses a fire truck, including the power system as described in Embodiment 1.

[0039] What is disclosed in the content of the embodiments of the present utility model is only the preferred embodiments of the present utility model, and is only used to illustrate the technical solutions of the present utility model, rather than limiting it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A power system for a fire truck, characterized in that: It includes a single engine with a first power output shaft, a chassis gearbox connected to the chassis of the fire truck, a water pump for fire fighting, a motor with a second power output shaft, a generator with a mechanical energy input end and a first electrical energy output end, an electric storage device, and a power take-off with a third power output shaft; The first power output shaft of the engine is connected to the chassis of the fire truck through the chassis gearbox to provide power for the driving of the fire truck; The input end of the power take-off is drivingly connected to the first power output shaft to obtain part of the power of the engine and output the power through the third power output shaft of the power take-off; The mechanical energy input end of the generator is drivingly connected to the third power output shaft of the power take-off, the first electric energy output end of the generator is electrically connected to the charging end of the power storage device, and the discharging end of the power storage device is electrically connected to the first power input end of the motor; The second power output shaft of the motor is drivingly connected to the impeller shaft of the water pump to provide power for the water pump to discharge water.

2. The power system according to claim 1, characterized in that: The generator also has a second power output terminal, and the motor also has a second power input terminal; the second power output terminal of the generator is electrically connected to the second power input terminal of the motor; the power input from the first power input terminal and the second power input terminal of the motor jointly powers the motor.

3. The power system according to claim 1, characterized in that: The power take-off is a sandwich type power take-off or a gearbox power take-off.

4. The power system according to claim 1, characterized in that: It also includes a water pump gearbox; the input end of the water pump gearbox is drivingly connected to the second power output shaft of the motor, and the output end of the water pump gearbox is drivingly connected to the impeller shaft.

5. The power system according to claim 4, characterized in that: The water pump gearbox is a speed increasing box or a speed reducing box.

6. The power system according to claim 2, characterized in that: The power storage device is a power battery pack.

7. The power system according to claim 1, characterized in that: The engine is a fuel engine.

8. A fire truck, characterized in that: Comprising a power system as described in any one of claims 1-7.

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