Hybrid power driving system and method with fire fighting function

Abstract

The invention discloses a hybrid power driving system and method with a fire fighting function. The system comprises a liquefied gas storage tank, a pressure reducing valve, a heater, a case, a storage battery and a ventilation pipeline set. A liquefied gas inflow pipe and a ventilation pipeline set are arranged at an inlet and an outlet of the liquefied gas storage tank respectively, the ventilation pipeline set comprises a first ventilation pipeline connected with the liquefied gas storage tank, and a pressure reducing valve and a heater are arranged on the first ventilation pipeline and used for changing liquefied gas into high-pressure flame-retardant gas. A dual-power motor is arranged in the machine box and comprises a pneumatic motor and an electric motor, the second ventilation pipeline is at least connected with a fire extinguishing pipeline set used for extinguishing fire, and a connector used for being connected into an external air pipe is arranged at the end, away from the second ventilation pipeline, of the fire extinguishing pipeline set. The generated high-pressure flame-retardant gas can be matched with the storage battery to achieve the hybrid power driving function, and the rapid fire extinguishing function can be achieved through the arranged fire extinguishing pipeline set in emergency.

Description

Technical Field

[0001] The present invention relates to the technical field of power engineering, and in particular to a hybrid power drive system and method that also takes fire-fighting function into consideration. Background Art

[0002] At present, hybrid vehicles need to use high-energy batteries, which can only store 260Wh per kilogram, and the storage energy density is low, so they need to be charged frequently. The charging time is long, and the battery and motor are at risk of thermal runaway during the charging process and the battery power supply process. Expensive thermal management systems have to be equipped, which increases the complexity of the system, the probability of failure and the difficulty of maintenance. In addition, due to the storage of compressed gas, the storage capacity of traditional cylinders is limited, and they need to be replaced or inflated frequently. The current compressed gas-powered locomotives use traditional high-pressure tanks and pneumatic motors. Pneumatic motors generally have higher efficiency in the range of 50% to 80% of the idling speed, so when the vehicle is traveling at a low speed, the efficiency is low. In addition, since the high-pressure tank stores less compressed gas and has a large weight, the battery life is short and the practicality is not high.

[0003] Therefore, it is urgent to propose a new solution to solve the above problems. Summary of the invention

[0004] The present invention provides a hybrid power driving system and method taking into account fire fighting function, so as to solve the problems of low utilization efficiency and short endurance time of compressed gas in the prior art.

[0005] The present invention provides a hybrid power drive system with fire-fighting function, including a liquefied gas storage tank, a pressure reducing valve, a heater, a chassis, a battery and a ventilation pipeline group;

[0006] A liquefied gas inflow pipe and a venting pipeline group are respectively provided at the inlet and outlet of the liquefied gas storage tank, the venting pipeline group includes a first venting pipeline connected to the liquefied gas storage tank, the pressure reducing valve and the heater are provided on the first venting pipeline, and the pressure reducing valve and the heater are used to convert the liquefied gas into a high-pressure flame-retardant gas;

[0007] A dual-power motor is arranged in the chassis, and the dual-power motor includes a pneumatic motor and an electric motor, the first ventilation pipeline is connected to the pneumatic motor through the second ventilation pipeline, the pneumatic motor is driven by the high-pressure flame-retardant gas, and the electric motor is driven by a battery;

[0008] The second ventilation pipeline is connected to at least one fire extinguishing pipeline group for extinguishing fire, and one end of the fire extinguishing pipeline group away from the second ventilation pipeline is provided with a connector for connecting to an external air pipe.

[0009] Furthermore, the chassis also includes a power recovery device, a power output shaft and a power bearing. The power recovery device is connected to the dual power motor through the power output shaft, and the power output shaft is supported by the power bearing.

[0010] Furthermore, a temperature sensor and a pressure sensor are provided in the liquefied gas storage tank, a circulating cooling system cooperating with the temperature sensor is provided on the liquefied gas storage tank, and a pressure relief valve electrically connected to the pressure sensor is provided on the top of the liquefied gas storage tank.

[0011] Furthermore, the circulating cooling system includes a cooling liquid tank, a cooling liquid inlet pipe, a cooling liquid outlet pipe and an in-tank cooling pipe, and the in-tank cooling pipe is used to circulate and cool the liquid in the liquefied gas storage tank.

[0012] Furthermore, a first three-way valve is provided in the second ventilation pipeline, the third end of the first three-way valve is connected to the fourth ventilation pipeline, the outlet of the pneumatic motor is connected to the third ventilation pipeline, the third ventilation pipeline and the fourth ventilation pipeline are connected to the fifth ventilation pipeline via a third three-way valve arranged in the middle, and the end of the fifth ventilation pipeline away from the third three-way valve is provided with a first fire-fighting joint connected to an external air pipe.

[0013] Furthermore, a second three-way valve is provided in the second ventilation pipeline, the third end of the second three-way valve is connected to the sixth ventilation pipeline, the end of the sixth ventilation pipeline away from the second three-way valve is provided with a second fire-fighting joint connected to the external air pipe, and the sixth ventilation pipeline is provided with an electric on-off valve.

[0014] Furthermore, a filling valve and a one-way valve are provided on the liquefied gas inflow pipe.

[0015] The present invention provides a hybrid power driving method taking into account fire fighting function, comprising the following steps:

[0016] When the vehicle speed is ≤ V1, the dual-power motor is fully powered only by the battery;

[0017] When the vehicle speed is between V1 and V2, the pressure reduction ratio of the pressure reducing valve is set to N1, and the liquefied gas is gasified by the pressure reducing valve and the heater to become a high-pressure flame-retardant gas, which is discharged through the first ventilation pipeline, the second ventilation pipeline, the pneumatic motor, the third ventilation pipeline and the fifth ventilation pipeline in sequence. At this time, the battery provides part of the power for the dual-power motor;

[0018] When the vehicle speed is ≥ V2, the pressure reduction ratio of the pressure reducing valve is set to N2, wherein N2 < N1, and the dual-power motor is fully powered only by the high-pressure flame-retardant gas vaporized by the pressure reducing valve and the heater.

[0019] This embodiment also includes opening the pressure reducing valve and the heater when a fire occurs externally, and by adjusting the first three-way valve and the second three-way valve, part of the high-pressure flame-retardant gas is connected to the first fire-fighting joint through the fourth ventilation pipeline, the third three-way valve and the fifth ventilation pipeline in sequence, and the other part of the high-pressure flame-retardant gas is connected to the second fire-fighting joint through the second ventilation pipeline, the second three-way valve and the sixth ventilation pipeline in sequence, and then connected to the first fire-fighting joint and the second fire-fighting joint through the external air pipe for fire extinguishing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The hybrid power drive and fire extinguishing system of the present invention converts the liquefied gas in the liquefied gas storage tank into a gaseous high-pressure flame-retardant gas through a pressure reducing valve and a heater. The generated high-pressure flame-retardant gas can not only cooperate with the battery to realize the hybrid power drive function, but also can realize the rapid fire extinguishing function through the set fire extinguishing pipeline group in an emergency. In addition, the compressed liquefied gas absorbs heat and takes away the heat in the system, thereby realizing full utilization of energy;

[0022] 2. The hybrid driving and fire extinguishing method of the present invention converts the liquefied gas in the liquefied gas storage tank into a gaseous high-pressure flame-retardant gas through a pressure reducing valve and a heater. By combining with a battery, three power modes of pure electric driving, hybrid driving and pure high-pressure gas can be realized. Moreover, the battery is used for electric driving only at low speeds, which reduces the demand for battery capacity. It has the advantages of energy saving and environmental protection, high energy density, no need for a cooling system, and no reliance on batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a hybrid power drive and fire extinguishing system according to a first embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a hybrid power drive and fire extinguishing system according to a second embodiment of the present invention;

[0025] Figure 3 A schematic flow chart of a hybrid power driving method of the present invention that takes into account fire-fighting functions;

[0026] Figure 4 A schematic diagram of the relationship between power and pressure reduction ratio in the hybrid power driving method of the present invention taking into account the fire-fighting function;

[0027] Figure numerals: 1, liquefied gas storage tank; 11, pressure relief valve; 12, temperature sensor; 13, pressure sensor; 14, liquefied gas inlet pipe; 141, filling valve; 142, one-way valve; 21, pressure reducing valve; 22, heater; 31, first three-way valve; 32, second three-way valve; 33, third three-way valve; 4, chassis; 41, dual power motor; 42, power recovery device; 43, power output shaft; 44, power bearing; 5, circulating cooling system; 51, cooling liquid tank; 52, cooling liquid inlet pipe; 53, cooling liquid outlet pipe; 54, cooling pipe in the tank; 6, battery; 61, battery charging interface; 71, first fire connector; 72, second fire connector; 8, electric on-off valve; 9, ventilation pipeline group; 91, first ventilation pipeline; 92, second ventilation pipeline; 93, third ventilation pipeline; 94, fourth ventilation pipeline; 95, fifth ventilation pipeline; 96, sixth ventilation pipeline. DETAILED DESCRIPTION

[0028] In order to further understand the content, features and effects of the present invention, the following embodiments are given together with the attached Figures 1 to 3 The detailed instructions are as follows.

[0029] like Figure 1 As shown, the hybrid power drive system of the present invention with fire-fighting function includes a liquefied gas storage tank 1, a pressure reducing valve 21, a heater 22, a chassis 4, a battery 6 and a ventilation pipeline group 9, wherein the liquefied gas storage tank 1 may contain flame-retardant liquefied gas such as N2, which is low in price and does not pollute the environment;

[0030] A liquefied gas inflow pipe 14 and a venting pipeline group 9 are respectively provided at the inlet and outlet of the liquefied gas storage tank 1. The material of the liquefied gas storage tank 1 is a Dewar flask. The venting pipeline group 9 includes a first venting pipeline 91 connected to the liquefied gas storage tank 1. The pressure reducing valve 21 and the heater 22 are provided on the first venting pipeline 91. The pressure reducing valve 21 and the heater 22 are used to convert the liquefied gas into a high-pressure flame-retardant gas, wherein the pressure reducing valve 21 is an adjustable pressure reducing valve, and the pressure reducing ratio can be controlled;

[0031] A dual-power motor 41 is arranged in the chassis 4, and the dual-power motor 41 includes a pneumatic motor and an electric motor. The first ventilation pipeline 91 is connected to the pneumatic motor through the second ventilation pipeline 92. The pneumatic motor is driven by the high-pressure flame-retardant gas, and the electric motor is driven by the battery 6.

[0032] At least one fire extinguishing pipeline group for extinguishing fire is connected to the second ventilation pipeline 92 , and a connector for connecting to an external air pipe is provided at one end of the fire extinguishing pipeline group away from the second ventilation pipeline 92 .

[0033] The hybrid power drive and fire extinguishing system of the present invention converts the liquefied gas in the liquefied gas storage tank into a gaseous high-pressure flame-retardant gas through a pressure reducing valve and a heater. The generated high-pressure flame-retardant gas can not only cooperate with the battery to realize the hybrid power drive function, but also can realize the rapid fire extinguishing function through the set fire extinguishing pipeline group in an emergency. In addition, the heat in the system is taken away by absorbing heat through the compressed liquefied gas, thereby realizing full utilization of energy.

[0034] As a preferred embodiment, Figure 1 As shown, the chassis 4 also includes a power recovery device 42 , a power output shaft 43 and a power bearing 44 . The power recovery device 42 is connected to the dual power motor 41 via the power output shaft 43 , and the power output shaft 43 is supported by the power bearing 44 .

[0035] As a preferred embodiment, Figure 1 As shown, a temperature sensor 12 and a pressure sensor 13 are provided in the liquefied gas storage tank 1, a circulating cooling system 5 cooperating with the temperature sensor 12 is provided on the liquefied gas storage tank 1, and a pressure relief valve 11 electrically connected to the pressure sensor 13 is provided on the top of the liquefied gas storage tank 1.

[0036] As a preferred embodiment, Figure 1 As shown, the circulating cooling system 5 includes a cooling liquid tank 51, a cooling liquid inlet pipe 52, a cooling liquid outlet pipe 53 and an in-tank cooling pipe 54, and the in-tank cooling pipe 54 is used to circulate and cool the liquid in the liquefied gas storage tank 1.

[0037] As a first embodiment, Figure 1 As shown, the second ventilation pipeline 92 is provided with a first three-way valve 31, the third end of the first three-way valve 31 is connected to the fourth ventilation pipeline 94, the outlet of the pneumatic motor is connected to the third ventilation pipeline 93, the third ventilation pipeline 93 and the fourth ventilation pipeline 94 are connected to the fifth ventilation pipeline 95 through the third three-way valve 33 arranged in the middle, and the end of the fifth ventilation pipeline 95 away from the third three-way valve 33 is provided with a first fire-fighting joint 71 connected to an external air pipe. The above-mentioned fire-extinguishing pipeline group includes a first fire-extinguishing pipeline group consisting of the first three-way valve 31, the fourth ventilation pipeline 94 and the fifth ventilation pipeline 95.

[0038] As a second embodiment, Figure 2As shown, compared with the first embodiment, a second three-way valve 32 is further provided in the second ventilation pipeline 92, and the third end of the second three-way valve 32 is connected to the sixth ventilation pipeline 96, and the end of the sixth ventilation pipeline 96 away from the second three-way valve 32 is provided with a second fire-fighting connector 72 connected to the external air pipe, and the sixth ventilation pipeline 96 is provided with an electric on-off valve 8. By providing two fire-fighting connectors, it is convenient to extinguish the two fire-fighting points generated at the same time, thereby improving the fire-fighting efficiency. In addition to the first fire-fighting pipeline group, the fire-fighting pipeline group also includes a second fire-fighting pipeline group consisting of the second three-way valve 32, the sixth ventilation pipeline 96 and the electric on-off valve 8.

[0039] In this embodiment, a filling valve 141 and a one-way valve 142 are provided on the liquefied gas inlet pipe 14, wherein the one-way valve 142 is used to prevent the liquid from flowing back.

[0040] like Figure 3 and 4 As shown, the present invention also provides a hybrid power driving method taking into account the fire fighting function, comprising the following steps:

[0041] S1, when the vehicle speed is ≤ V1, the dual-power motor 41 is fully powered only by the battery 6, and the pressure reduction ratio of the pressure reducing valve 21 is set to 0;

[0042] S2. When the vehicle speed is between V1 and V2, the pressure reduction ratio of the pressure reducing valve 21 is set to N1. The liquefied gas undergoes a phase change through the pressure reducing valve 21 and the heater 22, absorbs the heat of the drive system, and becomes a high-pressure flame-retardant gas after gasification. The gas is discharged through the first ventilation pipeline 91, the second ventilation pipeline 92, the pneumatic motor, the third ventilation pipeline 93, and the fifth ventilation pipeline 95 in sequence. At this time, the battery 6 provides part of the power for the dual-power motor 41.

[0043] S3. When the vehicle speed is ≥ V2, the pressure reduction ratio of the pressure reducing valve 21 is set to N2, wherein N2<N1, and the dual-power motor 41 is fully powered only by the high-pressure flame-retardant gas vaporized by the pressure reducing valve 21 and the heater 22.

[0044] The hybrid driving and fire extinguishing method of the present invention converts the liquefied gas in the liquefied gas storage tank into a gaseous high-pressure flame-retardant gas through a pressure reducing valve and a heater. Through combination with a battery, three power modes of pure electric driving, hybrid driving and pure high-pressure gas can be realized. Moreover, the battery is used for electric driving only at low speeds, which reduces the demand for battery capacity. It has the advantages of energy saving and environmental protection, high energy density, no need to be equipped with a cooling system, and no dependence on batteries.

[0045] The hybrid driving method of the present invention taking into account the fire-fighting function also includes: when a fire occurs externally, opening the pressure reducing valve 21 and the heater 22, and by adjusting the first three-way valve 31 and the second three-way valve 32, part of the high-pressure flame-retardant gas is connected to the first fire-fighting connector 71 through the fourth ventilation pipeline 94, the third three-way valve 33 and the fifth ventilation pipeline 95 in sequence, and another part of the high-pressure flame-retardant gas is connected to the second fire-fighting connector 72 through the second ventilation pipeline 92, the second three-way valve 32 and the sixth ventilation pipeline 96 in sequence, and then connected to the first fire-fighting connector 71 and the second fire-fighting connector 72 through the external air pipe for fire extinguishing, thereby achieving the purpose of taking into account the fire-fighting function.

[0046] The invention described above only expresses the implementation methods of the embodiments of the present invention, and cannot be understood as limiting the scope of the invention patent, nor does it impose any form of limitation on the structure of the embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, several changes and improvements can be made without departing from the concept of the embodiments of the present invention, which all belong to the protection scope of the embodiments of the present invention.

Claims

1. A hybrid power drive system with fire-fighting function, characterized in that: It comprises a liquefied gas storage tank (1), a pressure reducing valve (21), a heater (22), a chassis (4), a storage battery (6) and a ventilation pipeline group (9); A liquefied gas inflow pipe (14) and a venting pipeline group (9) are respectively arranged at the inlet and outlet of the liquefied gas storage tank (1); the venting pipeline group (9) comprises a first venting pipeline (91) connected to the liquefied gas storage tank (1); the pressure reducing valve (21) and the heater (22) are arranged on the first venting pipeline (91); the pressure reducing valve (21) and the heater (22) are used to convert the liquefied gas into a high-pressure flame-retardant gas; A dual-power motor (41) is arranged in the chassis (4), the dual-power motor (41) comprising a pneumatic motor and an electric motor, the first ventilation pipeline (91) is connected to the pneumatic motor via a second ventilation pipeline (92), the pneumatic motor is driven by the high-pressure flame-retardant gas, and the electric motor is driven by a storage battery (6); At least one fire extinguishing pipeline group for extinguishing fire is connected to the second ventilation pipeline (92), and a connector for connecting to an external air pipe is provided at one end of the fire extinguishing pipeline group away from the second ventilation pipeline (92).

2. A hybrid power drive system with fire-fighting function according to claim 1, characterized in that: The chassis (4) also includes a power recovery device (42), a power output shaft (43) and a power bearing (44); the power recovery device (42) is connected to the dual power motor (41) via the power output shaft (43); and the power output shaft (43) is supported by the power bearing (44).

3. The hybrid power drive system with fire-fighting function according to claim 1, characterized in that: The liquefied gas storage tank (1) is provided with a temperature sensor (12) and a pressure sensor (13); the liquefied gas storage tank (1) is provided with a circulating cooling system (5) coordinated with the temperature sensor (12); and the top of the liquefied gas storage tank (1) is provided with a pressure relief valve (11) electrically connected to the pressure sensor (13).

4. A hybrid power drive system with fire-fighting function according to claim 3, characterized in that: The circulating cooling system (5) comprises a cooling liquid tank (51), a cooling liquid inlet pipe (52), a cooling liquid outlet pipe (53) and an in-tank cooling pipe (54), and the in-tank cooling pipe (54) is used to circulate and cool the liquid in the liquefied gas storage tank (1).

5. The hybrid power drive system with fire-fighting function according to claim 1, characterized in that: The second ventilation pipeline (92) is also provided with a first three-way valve (31); the third end of the first three-way valve (31) is connected to a fourth ventilation pipeline (94); the outlet of the pneumatic motor is connected to a third ventilation pipeline (93); the third ventilation pipeline (93) and the fourth ventilation pipeline (94) are connected to a fifth ventilation pipeline (95) via a third three-way valve (33) arranged in the middle; the end of the fifth ventilation pipeline (95) away from the third three-way valve (33) is provided with a first fire-fighting joint (71) connected to an external air pipe.

6. The hybrid power drive system with fire-fighting function according to claim 5, characterized in that: A second three-way valve (32) is also provided in the second ventilation pipeline (92); the third end of the second three-way valve (32) is connected to a sixth ventilation pipeline (96); an end of the sixth ventilation pipeline (96) away from the second three-way valve (32) is provided with a second fire-fighting connector (72) connected to an external air pipe; and an electric on-off valve (8) is provided on the sixth ventilation pipeline (96).

7. The hybrid power drive system with fire-fighting function according to claim 1, characterized in that: The liquefied gas inflow pipe (14) is provided with a liquid filling valve (141) and a one-way valve (142).

8. A hybrid power driving method taking into account fire fighting function, characterized in that: The following steps are involved: When the vehicle speed is ≤ V1, the dual power motor (41) is fully powered only by the battery (6); When the vehicle speed is between V1 and V2, the pressure reduction ratio of the pressure reducing valve (21) is set to N1, and the liquefied gas is gasified by the pressure reducing valve (21) and the heater (22) to become a high-pressure flame-retardant gas, and is discharged in sequence through the first ventilation pipeline (91), the second ventilation pipeline (92), the pneumatic motor, the third ventilation pipeline (93) and the fifth ventilation pipeline (95). At this time, the storage battery (6) provides part of the power for the dual-power motor (41); When the vehicle speed is ≥ V2, the pressure reduction ratio of the pressure reducing valve (21) is set to N2, wherein N2 < N1, and the dual-power motor (41) is provided with full power only by the high-pressure flame-retardant gas vaporized by the pressure reducing valve (21) and the heater (22).

9. The hybrid power driving method with fire-fighting function according to claim 8, characterized in that: The method also includes opening the pressure reducing valve (21) and the heater (22) when a fire occurs outside, adjusting the first three-way valve (31) and the second three-way valve (32), so that part of the high-pressure flame-retardant gas is connected to the first fire-fighting joint (71) through the fourth ventilation pipeline (94), the third three-way valve (33) and the fifth ventilation pipeline (95) in sequence, and another part of the high-pressure flame-retardant gas is connected to the second fire-fighting joint (72) through the second ventilation pipeline (92), the second three-way valve (32) and the sixth ventilation pipeline (96) in sequence, and then connected to the first fire-fighting joint (71) and the second fire-fighting joint (72) through the external air pipe to extinguish the fire.

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