Fire-fighting special motor

Abstract

The invention provides a fire-fighting special motor which comprises a shell, the shell is provided with a lower water inlet and an upper water outlet, and a water flow channel is formed between the lower water inlet and the upper water outlet; a sealing cavity is formed in the shell, a driving motor is connected into the sealing cavity, and a working impeller is arranged in a water flow channel outside the sealing cavity; the output end of the driving motor is in transmission connection with the working impeller through a non-contact transmission mechanism; the driving motor drives the working impeller to rotate and pump liquid. The driving motor is completely isolated from an external water flow channel through the sealing cavity, the driving motor achieves power transmission through the non-contact transmission mechanism, the sealing performance is guaranteed, and it is ensured that the fire-fighting motor can reliably operate when starting is needed in the case of sudden fire under the working conditions of long-term standby and little operation. And the working impeller and the motor are integrated in the shell, so that the overall size and weight are reduced, and installation and deployment in space-limited scenes such as fire-fighting vehicles and narrow corridors are more convenient.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and specifically relates to a fire-fighting motor. Background Technology

[0002] Fire pumps are the core power equipment in fire protection systems, and their reliability directly affects safety. Traditional fire pump systems typically employ an asynchronous motor and centrifugal pump structure. This structure requires the pump shaft to pass through the pump casing to connect the motor and impeller, which creates dynamic sealing issues. Although mechanical seals or packing seals are commonly used, under conditions of long-term standby and infrequent operation, the seals are prone to aging and drying out and failing. Once started, high-pressure water can easily leak from the shaft seal, leading to pump failure and even motor damage. Furthermore, the asynchronous motor and centrifugal pump structure results in a large, heavy unit that is complex to install and maintain. Misalignment in the asynchronous motor and centrifugal pump can lead to abnormal wear of the bearings and mechanical seals, generating vibration and noise.

[0003] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0004] Purpose of the invention: To overcome the above shortcomings, this invention provides a fire-fighting dedicated motor that integrates the drive motor and pump impeller within a housing, employing non-contact transmission technology to avoid shaft seal leakage. Furthermore, this invention features a reasonable structure, good cooling effect, and stable operation, making it an integrated motor suitable for fire-fighting applications.

[0005] Technical Solution: To achieve the above objectives, this invention provides a fire-fighting dedicated motor, including a housing with a lower inlet and an upper outlet, forming a water flow channel between them. A sealed cavity is provided inside the housing, and a drive motor is connected within the sealed cavity. A working impeller is located within the water flow channel outside the sealed cavity. The output end of the drive motor is connected to the working impeller via a non-contact transmission mechanism. The drive motor drives the working impeller to rotate and pump liquid. This invention completely isolates the drive motor from the external water flow channel through the sealed cavity, effectively solving the leakage problem caused by shaft seal wear and aging in traditional fire pumps. The output end of the drive motor and the working impeller achieve power transmission through a non-contact transmission mechanism, achieving torque transmission without mechanical connection, ensuring sealing performance. This ensures that the sealing structure maintains good integrity even under long-term standby and infrequent operation conditions, thus enabling reliable operation when a sudden fire requires startup, avoiding pump failure due to leakage. Furthermore, this invention integrates the impeller and motor within the housing, shortening the transmission distance between the motor and the pump body, reducing the overall size and weight, and facilitating installation and deployment in space-constrained environments such as fire trucks and narrow corridors. The integrated design reduces connecting components, minimizing vibration and noise issues caused by misalignment, and improving operational stability.

[0006] Furthermore, in the aforementioned fire-fighting motor, the sealed chamber is composed of a sealing sleeve. The upper and lower ends of the sealing sleeve are sealed to the housing, encapsulating the drive motor within it. This sealing sleeve is made of non-magnetic material, ensuring effective penetration of magnetic lines of force while withstanding certain water pressure and corrosion. The sealing sleeve's upper and lower ends are sealed to the housing, encapsulating the drive motor within it, forming a reliable static seal structure. This completely eliminates the risk of dynamic seal failure, ensuring no leakage occurs during long-term use.

[0007] Furthermore, in the aforementioned fire-fighting motor, the non-contact transmission mechanism is a magnetic coupler. The magnetic coupler transmits torque through the magnetic force between permanent magnets, achieving a completely sealed power transmission. This transmission method not only solves the leakage problem but also has a certain overload protection function; when the impeller jams, the magnetic coupler will automatically slip, preventing the motor from burning out.

[0008] Furthermore, in the aforementioned fire-fighting motors, the drive motor is an external rotor motor. External rotor motors are characterized by their compact structure, large moment of inertia, and high output torque, making them particularly suitable for use with magnetic coupling structures. The external rotor structure facilitates the installation of the magnetic coupler, allowing magnets to be directly mounted on the outer surface of the external rotor.

[0009] Furthermore, in the aforementioned fire-fighting motor, the drive motor includes a fixed shaft fixedly connected within the housing; an inner stator fixedly sleeved on the outside of the fixed shaft; and an outer rotor rotatably mounted on the outside of the inner stator via bearings connected to the outer circumference of the fixed shaft. The fixed shaft, as the core support structure of the entire motor, provides a precise positioning reference for the inner stator and bearings. Sealed bearings are used to ensure that no maintenance is required during the lifespan of the drive motor.

[0010] Furthermore, in the aforementioned fire-fighting motor, the magnetic coupler includes a first magnet portion fixed to the outer wall of the outer rotor, and a second magnet portion fixed to the inner wall of the working impeller and disposed opposite to the first magnet portion; the first magnet portion and the second magnet portion constitute magnetic coupling. Both the first magnet portion and the second magnet portion use high-performance permanent magnet materials to ensure torque transmission while minimizing eddy current losses.

[0011] Furthermore, in the aforementioned fire-fighting motor, the impeller is a spiral pump blade, which can be a single-head or multi-head spiral structure. Spiral pump blades offer advantages such as stable flow rate, low pressure pulsation, and minimal disturbance to the medium, making them particularly suitable for fire-fighting water supply requirements. Depending on different flow rate and head requirements, spiral structures with varying numbers of heads can be selected.

[0012] Furthermore, in the aforementioned fire-fighting motor, the outer rotor includes a rotating shell and a permanent magnet fixed inside the rotating shell. The permanent magnet is a surface-mount magnet. Surface-mount structure has a simple manufacturing process and high magnetic field strength, which is beneficial for improving the power density and efficiency of the drive motor. The permanent magnet is optimized using a segmented skewed pole configuration to reduce cogging torque and torque ripple.

[0013] Furthermore, in the aforementioned fire-fighting motor, the water flow channel is constructed as an annular space that flows in from below and surrounds the sealed chamber, then flows out from above. This flow channel design allows the pumped medium to fully contact the outer wall of the sealing sleeve, effectively carrying away the heat generated during the operation of the drive motor and achieving efficient cooling. This provides a highly efficient cooling effect for the drive motor within the sealed chamber, ensuring that the drive motor will not be damaged by overheating during prolonged high-load fire-fighting operations, thus guaranteeing its continuous and reliable operation in emergency situations. Simultaneously, the annular flow channel structure helps reduce flow resistance and improve pump efficiency.

[0014] As can be seen from the above technical solution, the present invention has the following beneficial effects: ① The fire-fighting motor of this invention eliminates all dynamic sealing links. The drive motor is completely sealed in a sealed cavity formed by a sealing sleeve, which is completely physically isolated from the pumping medium, eliminating the hidden danger of leakage of traditional shaft seals.

[0015] ② This invention integrates the motor, magnetic coupler and pump blade into a single housing, eliminating intermediate components such as couplings and bearing seats, simplifying the system structure, reducing the overall size and weight, and facilitating installation and layout in space-constrained fire-fighting equipment.

[0016] ③ This invention employs magnetic drive, which has buffering and vibration reduction characteristics, effectively absorbing the impact of the motor and load. Combined with the stable flow characteristics of the spiral pump impeller itself, the entire unit operates smoothly, with significantly lower noise and vibration compared to traditional split-type pump sets.

[0017] ④ This invention eliminates dynamic seals, and the main transmission components operate in a non-contact manner, resulting in minimal wear and extended maintenance cycles. It is suitable for long-term standby and infrequent operation conditions.

[0018] ⑤ The annular water flow channel designed in this invention enables the pumped liquid to continuously and uniformly cool the sealing sleeve and the internal motor, ensuring that the motor can run at maximum power for a long time, thus improving the reliability and overload capacity of the equipment.

[0019] ⑥ The present invention has no dynamic seal and the spiral pump blades are designed to handle media containing a small amount of solid particles, and is more adaptable to fire water sources. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the fire-fighting motor of the present invention; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 for Figure 1 A magnified view of a portion of the image.

[0021] In the diagram: 1. Housing, 11. Lower inlet, 12. Upper outlet, 13. Sealing sleeve, 2. Drive motor, 21. Inner stator, 22. Outer rotor, 221. Rotating shell, 222. Permanent magnet, 223. Bearing, 224. First magnet section, 3. Working impeller, 31. Second magnet section, 4. Fixed shaft. Detailed Implementation Example

[0022] like Figure 1 The fire-fighting motor shown includes a housing 1, which has a lower inlet 11 and an upper outlet 12, forming a water flow channel between them. A sealed cavity is provided inside the housing 1, and a drive motor 2 is connected within the sealed cavity. A working impeller 3 is located in the water flow channel outside the sealed cavity. The output end of the drive motor 2 is connected to the working impeller 3 via a non-contact transmission mechanism. The drive motor 2 drives the working impeller 3 to rotate and pump liquid. The housing 1 is cylindrical and consists of an upper cover, a middle cover, and a lower cover. The upper cover, middle cover, and lower cover are all made of high-strength, corrosion-resistant cast iron or stainless steel. They are fixedly connected by bolts, and sealing grooves are provided at the connection points of each cover, with sealing rings inside to ensure airtightness.

[0023] like Figure 2 The fire-fighting motor shown has a sealed chamber composed of a sealing sleeve 13. The upper and lower ends of the sealing sleeve 13 are sealed to the housing 1, encapsulating the drive motor 2 within it. The sealing sleeve 13 is made of a non-magnetic material, ensuring effective penetration of magnetic lines of force while withstanding certain water pressure and corrosion. Flanges are provided at both the upper and lower ends of the sealing sleeve 1, connecting to mounting grooves on the housing 1 (upper and lower covers). A sealing gasket is placed within the mounting groove to ensure a tight seal. The sealing sleeve 13 uses a high-strength, low-conductivity non-magnetic material, such as 304 stainless steel, to ensure efficient penetration of magnetic lines of force while possessing sufficient strength and pressure resistance. The sealing sleeve 13 encapsulates the drive motor 2, forming a reliable static seal structure and eliminating the risk of dynamic seal failure.

[0024] In this embodiment, the non-contact transmission mechanism is a magnetic coupler. The magnetic coupler transmits torque through the magnetic force between permanent magnets, achieving a completely sealed power transmission. This transmission method not only solves the leakage problem but also has a certain overload protection function. When the impeller jams, the magnetic coupler will automatically slip, preventing the motor from burning out.

[0025] In this embodiment, the drive motor 2 is configured as an external rotor motor. External rotor motors are characterized by their compact structure, large moment of inertia, and high output torque, making them particularly suitable for use with magnetic coupling structures. The external rotor structure facilitates the installation of the magnetic coupler, allowing magnets to be directly mounted on the outer surface of the external rotor.

[0026] In this embodiment, the drive motor 2 includes a fixed shaft 4 fixedly connected inside the housing 1; an inner stator 21 fixedly sleeved on the outside of the fixed shaft 4; and an outer rotor 22 rotatably disposed on the outside of the inner stator 21 via bearings 223 connected to the outer periphery of the fixed shaft 4. The fixed shaft 4 is an alloy steel shaft, and its upper and lower ends are fixed to the upper and lower housing covers of the housing 1. The fixed shaft 4 serves as the core support structure of the entire motor, providing a precise positioning reference for the inner stator 21 and the bearings 223.

[0027] like Figure 3 The fire-fighting motor shown includes a magnetic coupler comprising a first magnet portion 224 fixed to the outer wall of the outer rotor 22, and a second magnet portion 31 fixed to the inner wall of the working impeller 3 and disposed opposite to the first magnet portion 224; the first magnet portion 224 and the second magnet portion 31 constitute a magnetic coupling. Both the first magnet portion 224 and the second magnet portion 31 are made of high-performance permanent magnet material. The number of pole pairs of the second magnet portion 31 is exactly the same as that of the first magnet portion 224, and they are precisely aligned with each other in the axial and radial directions. The two are separated only by the thin wall of the sealing sleeve 13, forming a strong magnetic coupling pair.

[0028] In this embodiment, the working impeller 3 is configured as a spiral pump blade, and the spiral pump blade is configured as a single-head spiral or a multi-head spiral structure.

[0029] In this embodiment, the outer rotor 22 includes a rotating shell 221 and a permanent magnet 222 fixed inside the rotating shell 221. The permanent magnet 222 is a surface-mount magnet. The magnet 222 is made of high-performance neodymium iron boron material and is optimized using a segmented skewed pole configuration.

[0030] In this embodiment, the water flow channel is constructed as an annular space that flows in from below and surrounds the sealed chamber, then flows out from above. This flow channel design allows the pumping medium to fully contact the outer wall of the sealing sleeve, effectively carrying away the heat generated by the drive motor 2 during operation, achieving efficient cooling. This provides a highly efficient cooling effect for the drive motor 2 within the sealed chamber, ensuring that the drive motor 2 will not be damaged by overheating during prolonged high-load firefighting operations, and guaranteeing its continuous and reliable operation in emergency situations. Simultaneously, the annular flow channel structure helps reduce flow resistance and improve pump efficiency.

[0031] The working principle of this invention is as follows: When alternating current is applied to the three-phase windings 212 of the inner stator 21, a rotating magnetic field is generated, driving the outer rotor 22 to rotate. The outer rotor 22 drives the first magnet section 224 to rotate synchronously, and drives the second magnet section 31 and the working impeller 3 to rotate through magnetic coupling force. Water is drawn in from the lower inlet 11 and enters the water flow channel. Under the rotation of the working impeller 3, it flows upward along the channel and makes full contact with the outer wall of the sealing sleeve 13, absorbing the heat generated by the operation of the drive motor 2. Finally, it is discharged from the upper outlet 12, completing the fire-fighting water supply operation.

[0032] Example 2 Based on Example 1, this example adds a status monitoring device. A temperature sensor is installed inside the sealed chamber to monitor the temperature rise inside the motor in real time, preventing the motor from overheating and burning out due to overload or poor cooling. The temperature signal is led out to an external controller via a lead wire. When the temperature exceeds a set threshold, the controller will issue an alarm or automatically reduce the output power, further enhancing the intelligence and safety of the equipment.

[0033] The above embodiments are exemplary and are intended to illustrate the technical concept and features of the present invention, so that those skilled in the art can understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fire service specific electric motor characterized in that: The utility model provides a kind of water pump, including shell (1), the shell (1) is equipped with lower water inlet (11) and upper water outlet (12), and water flow passage is formed between the lower water inlet (11) and upper water outlet (12);Sealing cavity is equipped in the shell (1), and driving motor (2) is connected in the sealing cavity, and working impeller (3) is equipped in the water flow passage outside the sealing cavity;The output end of the driving motor (2) is driven working impeller (3) and is connected by non-contact transmission mechanism transmission;Driving motor (2) drives working impeller (3) to rotate and pump liquid.

2. The fire service specific electric machine of claim 1, characterized in that: The sealing cavity is composed of sealing sleeve (13), and the upper and lower ends of the sealing sleeve (13) are sealingly connected with the shell (1), and the driving motor (2) is encapsulated therein.

3. The fire service specific electric machine of claim 1, wherein: The non-contact transmission mechanism is a magnetic coupler.

4. The fire service specific electric machine of claim 3, wherein: The driving motor (2) is an external rotor motor.

5. The fire service specific electric machine of claim 4, wherein: The driving motor (2) includes a fixed shaft (4) fixedly connected in the shell (1), an inner stator (21) fixedly sleeved on the outer side of the fixed shaft (4), and an outer rotor (22) rotatably arranged on the outer side of the inner stator (21) through a bearing (223), wherein the bearing (223) is connected to the outer periphery of the fixed shaft (4).

6. The fire service duty motor according to claim 5, characterized in that: The magnetic coupler includes a first magnet portion (224) fixed to the outer side wall of the outer rotor (22), and a second magnet portion (31) fixed to the inner side wall of the working impeller (3) and oppositely arranged with the first magnet portion (224); the first magnet portion (224) and the second magnet portion (31) constitute a magnetic coupling.

7. The fire service specific electric machine of claim 1, wherein: The working impeller (3) is a spiral pump blade, which is a single-head spiral or multi-head spiral structure.

8. The fire service rated electric machine of claim 5, wherein: The outer rotor (22) includes a rotating shell (221), and a permanent magnet (222) fixed to the inner side of the rotating shell (221), wherein the permanent magnet (222) is a surface-mounted magnet.

9. The fire service specific electric machine of claim 8, wherein: The water flow passage is configured to flow in from below and surround the annular space of the sealing cavity, and then flow out from above.

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