Electric fire pump system for fire fighting truck

Abstract

The invention relates to a fire pump driving system, and provides an electric fire pump system for a fire fighting truck in order to solve the problems of complex structure, poor heat dissipation performance and safety performance and the like of an existing fire pump system, the electric fire pump system for the fire fighting truck comprises a high-low pressure fire pump head, a permanent magnet direct drive motor, a cooling device and a system control device; the high-low pressure fire pump head is coaxially mounted on a driving shaft of the permanent magnet direct drive motor; the cooling device is provided with a cooling liquid inlet end and a cooling liquid outlet end, the cooling liquid outlet end is connected with a cooling water inlet of the permanent magnet direct drive motor through a guide pipe, and the cooling liquid inlet end is connected with a cooling water outlet of the permanent magnet direct drive motor through a guide pipe. Cooling liquid sequentially flows through a cooling water inlet of the permanent magnet direct drive motor and a cooling water outlet of the permanent magnet direct drive motor from the cooling liquid outlet end and then flows back into the cooling device from the cooling liquid inlet end, cooling liquid circulation is formed between the cooling device and the permanent magnet direct drive motor, and the system control device is connected with a junction box of the permanent magnet direct drive motor through a cable.

Description

Technical Field

[0001] The invention relates to a fire pump driving system, in particular to an electric fire pump system for a fire truck. Background Art

[0002] The fire pump system drives the pump shaft through the motor to rotate the impeller inside the pump, thereby sucking water from the water source and pressurizing it to be transported to the fire pipe network. The main components of the existing fire pump system include diesel engines and fire pumps. The diesel engine generates high-temperature and high-pressure gas by burning diesel, driving the piston to reciprocate, thereby driving the crankshaft to rotate and provide power for the fire pump; the fire pump uses this power to suck liquid into the pump body, and through the action of components such as impellers or gears, the liquid is pressurized and transported to the fire pipe network or directly sprayed to the fire source.

[0003] However, during the use of the existing internal combustion engine driven fire pump system, the transmission route structure in the rear gear box is complex and the heat dissipation performance is poor. Due to the large kinetic energy consumed by its transmission, the heat generated by the fire pump also increases, which undoubtedly increases the workload of the fire pump. If it runs continuously for a long time, it is very likely to "break down". In addition, the internal combustion engine driven fire pump used is very likely to pose a threat to the personal safety of firefighters during high-load operation, seriously affecting the smooth implementation of fire fighting and rescue activities, and has poor safety performance. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of the existing internal combustion engine driven fire pump system, such as complex transmission line structure, poor heat dissipation performance and safety performance, and to propose an electric fire pump system for fire trucks.

[0005] To achieve the above-mentioned purpose, the technical solution proposed by the present invention is:

[0006] An electric fire pump system for a fire truck, which is special in that it includes a high-pressure and low-pressure fire pump head, a permanent magnet direct-drive motor, a cooling device and a system control device;

[0007] The high and low pressure fire pump heads are coaxially mounted on the driving shaft of the permanent magnet direct drive motor, and the driving shaft of the permanent magnet direct drive motor is used to drive the high and low pressure fire pump heads to work;

[0008] The cooling device is provided with a coolant inlet and a coolant outlet, the coolant outlet is connected to the cooling water inlet of the permanent magnet direct drive motor through a conduit, the coolant inlet is connected to the cooling water outlet of the permanent magnet direct drive motor through a conduit, the coolant flows from the coolant outlet through the cooling water inlet of the permanent magnet direct drive motor and the cooling water outlet of the permanent magnet direct drive motor in sequence, and then flows back into the cooling device from the coolant inlet, thereby forming a coolant circulation between the cooling device and the permanent magnet direct drive motor, which is used to take away excess heat in the permanent magnet direct drive motor;

[0009] The system control device is connected to the junction box of the permanent magnet direct drive motor through a cable, and is used to control and adjust the output voltage and output speed of the permanent magnet direct drive motor.

[0010] Furthermore, the cooling device comprises a cooling box, a supercharging device and a cooling fan, the cooling box is provided with a coolant, and the coolant inlet and the coolant outlet are provided on the cooling box;

[0011] The air outlet of the cooling fan is arranged on one side of the cooling box, and is used to cool the cooling box;

[0012] The booster device is used to drive the coolant in the cooling box to flow out from the coolant outlet end of the cooling box, and then flow back into the cooling box from the coolant inlet end of the cooling box.

[0013] Furthermore, a water-slinging ring is provided between the driving end of the permanent magnet direct-drive motor and the connecting end surface of the high- and low-pressure fire pump head to prevent the liquid in the high- and low-pressure fire pump head from leaking into the permanent magnet direct-drive motor.

[0014] Furthermore, the high and low pressure fire pump head includes a low pressure centrifugal pump, a multi-stage high pressure centrifugal pump and a high pressure water inlet section which are coaxially sleeved on the driving shaft of the permanent magnet direct drive motor in sequence, and a high and low pressure sealing bracket is arranged between the low pressure centrifugal pump and the multi-stage high pressure centrifugal pump to separate the low pressure centrifugal pump and the multi-stage high pressure centrifugal pump and realize separate sealing of the two.

[0015] Furthermore, the cooling water outlet of the low-pressure centrifugal pump is connected to the water inlet of the high-pressure water inlet section through a high-low pressure switching pipe, and a high-low pressure switching valve is provided in the middle of the high-low pressure connecting pipe to control the connection or disconnection between the low-pressure centrifugal pump and the multi-stage high-pressure centrifugal pump.

[0016] Furthermore, a temperature sensor is provided inside the permanent magnet direct drive motor for real-time monitoring of the internal temperature of the permanent magnet direct drive motor;

[0017] The output end of the temperature sensor is connected to the system control device.

[0018] Furthermore, the conduit is a rubber hose.

[0019] Furthermore, the coolant is ethylene glycol antifreeze or clean water at room temperature.

[0020] Beneficial effects of the present invention:

[0021] [1] The electric fire pump system for a fire truck of the present invention can effectively reduce the temperature of the permanent magnet direct drive motor, so that the electric fire pump system can work for a long time, greatly improving the working capacity and stability of the fire truck; the coolant in the cooling device forms a coolant circulation between the permanent magnet direct drive motor through the conduit, which can directly take away a large amount of excess heat in the permanent magnet direct drive motor, and then cool the cooling box through the cooling fan on the cooling device, which can achieve long-term rapid cooling of the permanent magnet direct drive motor, and enable the electric high and low pressure fire pumps to operate stably and reliably for a long time, effectively improving the heat dissipation, safety and reliability of the electric fire pump system.

[0022] [2] The present invention coaxially installs the high and low pressure fire pump heads on the driving shaft of the permanent magnet direct drive motor, which can effectively reduce the energy consumption of the system, reduce the waste of transmission energy, improve the overall driving performance of the system, and enable the high and low pressure fire pump heads to exert good flow and pressure performance.

[0023] [3] The present invention controls and adjusts the output voltage and output speed of the permanent magnet direct-drive motor through a system control device, which can meet the needs of different usage scenarios, provide different working voltages, and flexibly control the flow output and pressure output of high and low pressure fire pump heads, thereby saving energy resources and extending the service life of the system.

[0024] [4] The present invention can effectively improve the waterproof performance of the system by arranging a water-slinging ring between the driving end of the permanent magnet direct-drive motor and the connecting end face of the high and low pressure fire pump head, thereby preventing the pump chamber liquid from entering the permanent magnet direct-drive motor due to mechanical seal failure, causing damage to the permanent magnet direct-drive motor, affecting the normal operation of the system, causing property losses, and interfering with the rescue progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of an electric fire pump system for a fire truck of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a cooling device according to an embodiment of the present invention; (the cooling liquid outlet is not shown)

[0027] Figure 3 This is a schematic diagram of the installation position of the water-slinging ring in an embodiment of the present invention;

[0028] Reference numerals:

[0029] 1-high and low pressure fire pump head, 2-permanent magnet direct drive motor, 3-system control device, 4-cooling device, 5-cooling box, 6-boosting device, 7-cooling fan, 8-cooling liquid inlet, 9-cooling liquid outlet, 10-cooling water inlet, 11-cooling water outlet, 12-conduit, 13-cable, 14-water ring, 15-low pressure centrifugal pump, 16-high pressure centrifugal pump, 17-high and low pressure sealing bracket, 18-high and low pressure connecting pipes, 19-high pressure water inlet section. DETAILED DESCRIPTION

[0030] like Figure 1 As shown, an electric fire pump system for a fire truck includes a high-pressure and low-pressure fire pump head 1, a permanent magnet direct-drive motor 2, a cooling device 4 and a system control device 3;

[0031] The high and low pressure fire pump head 1 is coaxially mounted on the driving shaft of the permanent magnet direct drive motor 2, and the driving shaft of the permanent magnet direct drive motor 2 is used to drive the high and low pressure fire pump head 1 to work; Figure 3 As shown, a water-slinging ring 14 is arranged between the driving end of the permanent magnet direct-drive motor 2 and the connecting end surface of the high-low pressure fire pump head 1, which is used to prevent the liquid in the high-low pressure fire pump head 1 from leaking into the permanent magnet direct-drive motor 2; the high-low pressure fire pump head 1 includes a low-pressure centrifugal pump 15, a multi-stage high-pressure centrifugal pump 16 and a high-pressure water inlet section 19 which are coaxially sleeved on the driving shaft of the permanent magnet direct-drive motor in sequence, and a high-low pressure sealing bracket 17 is arranged between the low-pressure centrifugal pump 15 and the multi-stage high-pressure centrifugal pump 16, which is used to separate the low-pressure centrifugal pump 15 and the multi-stage high-pressure centrifugal pump 16 and realize the separate sealing of the two; the cooling water outlet of the low-pressure centrifugal pump 15 passes through the high-low pressure switching pipe 18 and the water inlet of the high-pressure water inlet section 19, and a high-low pressure switching valve is arranged in the middle of the high-low pressure connecting pipe 18, which is used to control the connection or disconnection between the low-pressure centrifugal pump 15 and the multi-stage high-pressure centrifugal pump 16.

[0032] A temperature sensor is provided inside the permanent magnet direct drive motor 2, and an output end of the temperature sensor is connected to the system control device 3 for real-time monitoring of the internal temperature of the permanent magnet direct drive motor 2;

[0033] like Figure 2 As shown, the cooling device 4 includes a cooling box 5, a supercharging device 6 and a cooling fan 7. The cooling box 5 is provided with a coolant, which is ethylene glycol antifreeze or normal temperature water. The cooling box 5 is provided with a coolant inlet 8 and a coolant outlet 9; the air outlet of the cooling fan 7 is provided on one side of the cooling box 5, for cooling the cooling box 5;

[0034] The coolant outlet end 9 is connected to the cooling water inlet 10 of the permanent magnet direct drive motor 2 through a conduit 12, which is a rubber hose. The coolant inlet end 8 is connected to the cooling water outlet 11 of the permanent magnet direct drive motor 2 through the conduit 12. The supercharging device 6 drives the coolant in the cooling box 5 to flow from the coolant outlet end 9 through the cooling water inlet 10 of the permanent magnet direct drive motor 2 and the cooling water outlet 11 of the permanent magnet direct drive motor 2 in sequence, and then flows back to the cooling box 5 from the coolant inlet end 8, thereby forming a coolant circulation between the cooling box 5 and the permanent magnet direct drive motor 2 to take away the excess heat in the permanent magnet direct drive motor 2;

[0035] The system control device 3 is connected to the junction box of the permanent magnet direct drive motor 2 via a cable 13 , and is used to control and adjust the output voltage and output speed of the permanent magnet direct drive motor 2 .

Claims

1. An electric fire pump system for a fire truck, characterized in that: It comprises a high- and low-pressure fire pump head (1), a permanent magnet direct-drive motor (2), a cooling device (4) and a system control device (3); The high- and low-pressure fire pump heads (1) are coaxially mounted on a drive shaft of a permanent magnet direct-drive motor (2), and the drive shaft of the permanent magnet direct-drive motor (2) is used to drive the high- and low-pressure fire pump heads (1) to operate; The cooling device (4) is provided with a cooling liquid inlet end (8) and a cooling liquid outlet end (9); the cooling liquid outlet end (9) is connected to a cooling water inlet (10) of the permanent magnet direct drive motor (2) via a conduit (12); the cooling liquid inlet end (8) is connected to a cooling water outlet (11) of the permanent magnet direct drive motor (2) via a conduit (12); the cooling liquid flows from the cooling liquid outlet end (9) through the cooling water inlet (10) of the permanent magnet direct drive motor (2) and the cooling water outlet (11) of the permanent magnet direct drive motor (2) in sequence, and then flows back into the cooling device (4) from the cooling liquid inlet end (8), thereby forming a cooling liquid circulation between the cooling device (4) and the permanent magnet direct drive motor (2), and is used to remove excess heat in the permanent magnet direct drive motor (2); The system control device (3) is connected to the junction box of the permanent magnet direct drive motor (2) via a cable (13) and is used to control and adjust the output voltage and output speed of the permanent magnet direct drive motor (2).

2. The electric fire pump system for a fire truck according to claim 1, characterized in that: The cooling device (4) comprises a cooling box (5), a supercharging device (6) and a cooling fan (7); a cooling liquid is arranged in the cooling box (5); and the cooling liquid inlet end (8) and the cooling liquid outlet end (9) are arranged on the cooling box (5); The air outlet of the cooling fan (7) is arranged on one side of the cooling box (5) and is used to cool the cooling box (5); The booster device (6) is used to drive the coolant in the cooling box (5) to flow out from the coolant outlet end (9) of the cooling box (5), and then flow back into the cooling box (5) from the coolant inlet end (8) of the cooling box (5).

3. The electric fire pump system for a fire truck according to claim 2, characterized in that: A water slinger (14) is provided between the driving end of the permanent magnet direct drive motor (2) and the connecting end surface of the high and low pressure fire pump head (1) to prevent the liquid in the high and low pressure fire pump head (1) from leaking into the permanent magnet direct drive motor (2).

4. The electric fire pump system for a fire truck according to claim 3, characterized in that: The high- and low-pressure fire pump head (1) comprises a low-pressure centrifugal pump (15), a multi-stage high-pressure centrifugal pump (16) and a high-pressure water inlet section (19) which are coaxially sleeved on a permanent magnet direct-drive motor drive shaft in sequence, and a high- and low-pressure sealing bracket (17) is provided between the low-pressure centrifugal pump (15) and the multi-stage high-pressure centrifugal pump (16) for separating the low-pressure centrifugal pump (15) from the multi-stage high-pressure centrifugal pump (16) and achieving separate sealing of the two.

5. The electric fire pump system for a fire truck according to claim 4, characterized in that: The cooling water outlet of the low-pressure centrifugal pump (15) is connected to the water inlet of the high-pressure water inlet section (19) via a high-low pressure switching pipe (18), and a high-low pressure switching valve is provided in the middle of the high-low pressure connecting pipe (18) for controlling the connection or disconnection between the low-pressure centrifugal pump (15) and the multi-stage high-pressure centrifugal pump (16).

6. The electric fire pump system for a fire truck according to claim 5, characterized in that: A temperature sensor is provided inside the permanent magnet direct drive motor (2) for real-time monitoring of the internal temperature of the permanent magnet direct drive motor (2); The output end of the temperature sensor is connected to the system control device (3).

7. The electric fire pump system for a fire truck according to claim 6, characterized in that: The conduit (12) is a rubber hose.

8. The electric fire pump system for a fire truck according to claim 7, characterized in that: The coolant is ethylene glycol antifreeze or normal temperature water.

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