Electric high-low pressure fire pump for fire fighting truck

Abstract

The invention relates to a fire pump for a fire truck, and provides an electric high-low pressure fire pump for a fire truck in order to solve the technical problems that an existing fire pump for the fire truck is large in noise, low in fire extinguishing efficiency and unstable in rotating speed and power matching, and the flow and pressure performance of the fire pump cannot be fully exerted. Comprising a driving motor, a water inlet pipe, a low-pressure impeller assembly, a high-pressure impeller assembly, a high-pressure water inlet section and a driving connecting section, a high-low pressure sealing support is arranged between the low-pressure impeller assembly and the high-pressure impeller assembly. A high-low pressure switching pipe is arranged between the input end of the low-pressure impeller assembly and the input end of the high-pressure water inlet section, and a high-low pressure switching valve is arranged in the middle of the high-low pressure switching pipe. A water throwing ring matched with the driving shaft in diameter is arranged between the driving connecting section and the high-pressure water inlet section; a mechanical sealing device matched with the high-pressure water inlet section is further arranged on the connecting end face of the high-pressure water inlet section and the driving shaft of the driving motor.

Description

Technical Field

[0001] The invention relates to a vehicle fire pump, in particular to an electric high- and low-pressure fire pump for a fire truck. Background Art

[0002] All existing fire trucks are equipped with fire pumps. As one of the core components of fire trucks, the technology of vehicle-mounted electric fire pumps is constantly innovating with the development of the times.

[0003] The main function of a fire pump for a fire truck is to provide sufficient water pressure and water volume to ensure that firefighting operations can be carried out quickly and effectively at the fire scene; existing vehicle fire pumps are usually driven by a diesel engine, and use the high-speed rotation of the impeller to transfer energy to the water flow, generating strong pressure, so that the water flow can overcome gravity and reach higher floors or farther distances; since existing vehicle fire pumps mainly rely on internal combustion engines to drive, this driving mode not only produces a lot of noise, but also has problems such as low fire extinguishing efficiency and unstable speed-power matching, and cannot fully exert the flow and pressure performance of the fire pump. Therefore, a fire-fighting equipment that can adapt to market demand and provide more environmentally friendly, efficient, stable and reliable firefighting equipment is needed. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of the existing driving mode of vehicle fire pumps, such as high noise, low fire extinguishing efficiency, unstable speed power matching, and inability to fully exert the flow and pressure performance of the fire pump, and to propose an electric high and low pressure fire pump for fire trucks.

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

[0006] An electric high- and low-pressure fire pump for a fire truck, which is special in that it comprises a driving motor and a water inlet pipe, a low-pressure impeller assembly, a high-pressure impeller assembly, a high-pressure water inlet section and a driving connection section which are coaxially arranged on a driving shaft of the driving motor in sequence; the driving connection section is located at one end close to the driving motor;

[0007] A high-low pressure sealing bracket is provided between the low-pressure impeller assembly and the high-pressure impeller assembly; the high-pressure impeller assembly is connected to the high-pressure water inlet section;

[0008] The low-pressure impeller assembly is connected to the input port 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 switching pipe to control the connection or disconnection between the low-pressure impeller assembly and the high-pressure impeller assembly;

[0009] A water-slinging ring adapted to the diameter of the drive shaft is provided between the drive connection section and the high-pressure water inlet section to prevent the liquid in the high-pressure water inlet section from entering the drive motor through the drive connection section;

[0010] A matching mechanical sealing device is provided on the connecting end surface of the high-pressure water inlet section and the driving shaft of the driving motor, and is used to form a seal for the high-pressure water inlet section.

[0011] Further, the low-pressure impeller assembly includes a low-pressure casing, a low-pressure impeller and a low-pressure check valve;

[0012] The low-pressure impeller is arranged in the low-pressure housing, and the low-pressure check valve is fixed at the upper end of the water outlet of the low-pressure housing;

[0013] One end of the high-low pressure switching pipe is connected to the lower end of the water outlet of the low-pressure shell.

[0014] Further, the high-pressure impeller assembly includes a high-pressure housing, a multi-stage high-pressure impeller and a high-pressure check valve;

[0015] The multi-stage high-pressure impeller is arranged in a high-pressure housing, and a high-pressure check valve is fixed on the upper end of the water outlet of the high-pressure housing.

[0016] Furthermore, the drive motor is a permanent magnet direct drive motor.

[0017] Furthermore, the mechanical seal device is a dry wear resistant container-type mechanical seal.

[0018] Furthermore, the water-slinging ring is made of polytetrafluoroethylene material.

[0019] Furthermore, the thickness of the water-slinging ring is 4mm-5mm.

[0020] Furthermore, the dry wear resistant containerized mechanical seal device has a dry wear resistant time of 170s-180s.

[0021] Furthermore, the water inlet end of the low-pressure impeller in the low-pressure housing is located on a side away from the drive motor, and the water inlet ends of the multi-stage high-pressure impellers in the high-pressure housing are all located on a side close to the drive motor.

[0022] Beneficial effects of the present invention:

[0023] [1] The electric high and low pressure fire pump for fire trucks of the present invention has a simple structure, is easy to disassemble and assemble, and is easy to perform daily maintenance, which greatly saves manpower and material costs, and has strong reliability and practicality. By coaxially arranging various components on the driving shaft of the driving motor, the pump body noise and system axial force can be effectively reduced, the service life of the device is increased, and the flow performance and pressure performance of the fire pump are fully utilized, thereby ensuring the stable and safe operation of the fire pump and improving the fire extinguishing efficiency of the fire pump.

[0024] [2] The present invention arranges the water inlet end of the low-pressure impeller in the low-pressure casing on the side away from the driving motor, and the water inlet ends of the multi-stage high-pressure impellers in the high-pressure casing are arranged on the side close to the driving motor. This can effectively reduce the axial force between the various components, avoid device seal failure due to excessive axial force, effectively reduce the system failure rate, and can also flexibly adjust the rotation speed according to the actual application scenario, thereby greatly improving the fire extinguishing efficiency.

[0025] [3] The present invention can effectively prevent the liquid in the high-pressure water inlet section from entering the drive motor through the drive connection section by arranging a water-slinging ring between the drive connection section and the high-pressure water inlet section, thereby preventing the liquid in the pump chamber from leaking into the drive motor, effectively reducing the damage rate of the drive motor, improving the safety and reliability of the fire pump, and extending its service life.

[0026] [4] The present invention forms an effective seal on the high-pressure water inlet section by arranging a mechanical sealing device on the connecting end surface between the high-pressure water inlet section and the driving shaft of the driving motor, thereby preventing liquid from flowing out of the high-pressure water inlet section and causing damage to the device, thereby improving the overall sealing performance of the electric high and low pressure fire pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment of an electric high and low pressure fire pump for a fire truck of the present invention;

[0028] Figure 2 Schematic diagram of the installation position of the mechanical sealing device in the embodiment of the present invention;

[0029] Reference numerals:

[0030] 1-water inlet pipe, 2-low-pressure casing, 3-low-pressure impeller, 4-high- and low-pressure sealing bracket, 5-low-pressure check valve, 6-low-pressure impeller assembly, 7-high- and low-pressure switching pipe, 8-high- and low-pressure switching valve, 9-high-pressure impeller assembly, 10-mechanical sealing device, 11-high-pressure check valve, 12-high-pressure water inlet section, 13-drive connecting section, 14-water throwing ring, 15-drive motor, 16-high-pressure casing, 17-high-pressure impeller, 18-shaft holding screw, 19-fixing screw high-pressure check valve. DETAILED DESCRIPTION

[0031] like Figure 1As shown, an electric high- and low-pressure fire pump for a fire truck comprises a driving motor 15 and a water inlet pipe 1, a low-pressure impeller assembly 6, a high-pressure impeller assembly 9, a high-pressure water inlet section 12 and a driving connection section 13 which are coaxially arranged on the driving shaft of the driving motor 15 in sequence; the driving motor 15 is a permanent magnet direct drive motor, the water inlet pipe 1 is located at an end away from the driving motor 15, and the driving connection section 13 is located at an end close to the driving motor 15; wherein the low-pressure impeller assembly 6 and the high-pressure impeller assembly 9 are installed in series on the driving shaft; a high- and low-pressure sealing bracket 4 is arranged between the low-pressure impeller assembly 6 and the high-pressure impeller assembly 9; the high-pressure impeller assembly 9 is connected to the high-pressure water inlet section 12, and the low-pressure impeller assembly 6 comprises a low-pressure casing 2, a low-pressure impeller 3 and a low-pressure check valve 5; the low-pressure impeller 3 is provided with Placed in the low-pressure shell 2, the low-pressure check valve 5 is fixed at the upper end of the water outlet of the low-pressure shell 2; one end of the high-low pressure switching pipe 7 is connected to the lower end of the water outlet of the low-pressure shell 2, and the other end is connected to the water inlet of the high-pressure water inlet section 12. A high-low pressure switching valve 8 is arranged in the middle of the high-low pressure switching pipe 7 to control the connection or disconnection between the low-pressure impeller assembly 6 and the high-pressure impeller assembly 9; the water inlet end of the low-pressure impeller 3 in the low-pressure impeller assembly 6 is located on the side away from the drive motor 15, and the water inlet ends of the multi-stage high-pressure impeller 17 in the high-pressure impeller assembly 9 are all located on the side close to the drive motor 15. The low-pressure impeller 3 and the multi-stage high-pressure impeller 17 are arranged in an axially symmetrical manner, which can well balance the axial force of the fire pump, thereby improving its service life and increasing the reliability of the device.

[0032] The other end of the low-pressure check valve 5 is connected to a low-pressure water outlet pipeline, and a low-pressure water outlet ball valve is arranged on the low-pressure water outlet pipeline;

[0033] The high-pressure impeller assembly 9 includes a high-pressure housing 16, a multi-stage high-pressure impeller 17 and a high-pressure check valve 11;

[0034] The multi-stage high-pressure impeller 17 is arranged in the high-pressure housing 16, and the high-pressure check valve 11 is fixed to the upper end of the water outlet of the high-pressure housing 16; the other end of the high-pressure check valve 11 is connected to a high-pressure water outlet pipeline, and a high-pressure water outlet ball valve is arranged on the high-pressure water outlet pipeline;

[0035] A high-low pressure switching valve 8 is arranged on the middle pipeline of the high-low pressure switching pipe 7. By controlling the high-low pressure switching valve 8, the low-pressure impeller assembly 6 and the high-pressure impeller assembly 9 can be operated in series or individually.

[0036] like Figure 2 As shown, a water-slinging ring 14 matched with the diameter of the driving shaft is arranged between the driving connection section 13 and the high-pressure water inlet section 12, so as to prevent the liquid in the mechanical sealing device 10 on the high-pressure water inlet section 12 from leaking into the driving motor 15 after failure. The water-slinging ring 14 is made of polytetrafluoroethylene material with a thickness of 4mm-5mm.

[0037] A mechanical sealing device 10 adapted to the high-pressure water inlet section 12 and the connecting end surface of the driving shaft of the driving motor 15 is also provided. The mechanical sealing device 10 is connected to the driving shaft of the driving motor 15 through a shaft clamping screw 18, and is connected to the high-pressure water inlet section 12 through a fixing screw 19, so as to form a seal for the high-pressure water inlet section 12; the mechanical sealing device 10 is a dry-wear resistant containerized mechanical sealing device, and the dry-wear resistant time of the dry-wear resistant containerized mechanical sealing device is: 170s-180s.

[0038] The working principle of the high and low pressure fire pump in this embodiment is as follows:

[0039] When starting the fire pump, water needs to be injected into the fire pump through the water inlet pipe 1;

[0040] When operating under low-pressure conditions, open the low-pressure water outlet ball valve on the low-pressure water outlet pipe, close the high-pressure and low-pressure switching valve 8, close the high-pressure water outlet ball valve on the high-pressure water outlet pipe, adjust the speed of the fire pump to the rated speed, the low-pressure outlet pressure to the rated pressure of 1MPa, and the rated flow rate to 120L / s. The water in the water inlet pipe 1 enters the low-pressure impeller assembly 6, and the low-pressure impeller 3 rotates to drive the water flow through the low-pressure check valve 5 and is thrown out through the low-pressure water outlet pipe;

[0041] When operating under high-pressure conditions, close the low-pressure water outlet ball valve on the low-pressure water outlet pipeline, open the high-low pressure switching valve 8 and the high-pressure water outlet ball valve on the high-pressure water outlet pipeline, adjust the pump speed to the rated speed, the high-pressure outlet pressure to the rated pressure of 4MPa, and the rated flow rate to 30L / s. The water in the water inlet pipe 1 enters the high-pressure impeller assembly 9, and the multi-stage high-pressure impeller 17 rotates to drive the water flow through the high-pressure check valve 11 and is thrown out through the high-pressure water outlet pipeline;

[0042] When operating in high- and low-pressure combined operation, open the low-pressure water outlet ball valve, the high- and low-pressure switching valve 8 on the low-pressure water outlet pipeline and the high-pressure water outlet ball valve on the high-pressure water outlet pipeline, adjust the pump speed to the rated speed, make the high-pressure outlet pressure reach the rated pressure of 5MPa and the flow rate of 25L / s, and the low-pressure outlet pressure reach the rated pressure of 1MPa and the flow rate of 50L / s. The water in the water inlet pipe 1 flows through the low-pressure impeller 3, the high- and low-pressure switching pipe 7, the high-pressure water inlet section 12 and the high-pressure impeller assembly 9, and is then thrown out through the high-pressure water outlet pipeline through the high-pressure check valve 11.

Claims

1. An electric high and low pressure fire pump for a fire truck, characterized in that: It comprises a driving motor (15), and a water inlet pipe (1), a low-pressure impeller assembly (6), a high-pressure impeller assembly (9), a high-pressure water inlet section (12), and a driving connection section (13) which are coaxially arranged on a driving shaft of the driving motor (15) in sequence; the driving connection section (13) is located at one end close to the driving motor (15); A high-low pressure sealing bracket (4) is provided between the low-pressure impeller assembly (6) and the high-pressure impeller assembly (9); the high-pressure impeller assembly (9) is in communication with the high-pressure water inlet section (12); The low-pressure impeller assembly (6) is connected to the input port of the high-pressure water inlet section (12) via a high-low pressure switching pipe (7), and a high-low pressure switching valve (8) is provided in the middle of the high-low pressure switching pipe (7) for controlling the connection or disconnection between the low-pressure impeller assembly (6) and the high-pressure impeller assembly (9); A water slinger (14) adapted to the diameter of the drive shaft is provided between the drive connection section (13) and the high-pressure water inlet section (12) to prevent the liquid in the high-pressure water inlet section (12) from leaking into the drive motor (15); A mechanical sealing device (10) adapted to the high-pressure water inlet section (12) and the driving shaft of the driving motor (15) is provided on the connecting end surface thereof, and is used to form a seal for the high-pressure water inlet section (12).

2. According to claim 1, an electric high and low pressure fire pump for a fire truck is characterized in that: The low-pressure impeller assembly (6) comprises a low-pressure casing (2), a low-pressure impeller (3) and a low-pressure check valve (5); The low-pressure impeller (3) is arranged in the low-pressure housing (2), and the low-pressure check valve (5) is fixed at the upper end of the water outlet of the low-pressure housing (2); One end of the high-low pressure switching tube (7) is connected to the lower end of the water outlet of the low-pressure housing (2).

3. According to claim 2, an electric high and low pressure fire pump for a fire truck is characterized in that: The high-pressure impeller assembly (9) comprises a high-pressure housing (16), a multi-stage high-pressure impeller (17) and a high-pressure check valve (11); The multi-stage high-pressure impeller (17) is arranged in the high-pressure housing (16), and the high-pressure check valve (11) is fixed to the upper end of the water outlet of the high-pressure housing (16).

4. According to claim 3, an electric high and low pressure fire pump for a fire truck is characterized in that: The drive motor (15) is a permanent magnet direct drive motor.

5. The electric high and low pressure fire pump for a fire truck according to claim 4, characterized in that: The mechanical sealing device (10) is a dry wear resistant container-type mechanical sealing device.

6. The electric high and low pressure fire pump for a fire truck according to claim 5, characterized in that: The water-slinging ring (14) is made of polytetrafluoroethylene material.

7. The electric high and low pressure fire pump for a fire truck according to claim 6, characterized in that: The thickness of the water-slinging ring (14) is 4 mm to 5 mm.

8. The electric high and low pressure fire pump for a fire truck according to claim 7, characterized in that: The dry wear resistant containerized mechanical seal device has a dry wear resistant time of 170s-180s.

9. The electric high and low pressure fire pump for a fire truck according to claim 8, characterized in that: The water inlet end of the low-pressure impeller (3) in the low-pressure housing (2) is located on a side away from the drive motor (15), and the water inlet ends of the multi-stage high-pressure impeller (17) in the high-pressure housing (16) are all located on a side close to the drive motor (15).

Images