A coaxial double-suction electric pump set

Abstract

This invention relates to a coaxial double-suction electric pump set, comprising a double-suction water pump, a three-phase motor, and a rigid common base. The three-phase motor has an extended main shaft that extends directly into the pump body of the double-suction water pump. The double-suction water pump includes a pump casing, an impeller installed inside the pump casing, and a single mechanical seal. The impeller is fixedly mounted on the extended main shaft and is directly supported and driven to rotate by the extended main shaft. The mechanical seal is located at the junction of the double-suction water pump and the three-phase motor. There is no coupling between the double-suction water pump and the three-phase motor; both are integrally fixed on the rigid common base. This invention adopts an integrated layout with the extended main shaft of the three-phase motor and the water pump coaxial, resulting in a compact structure, fewer parts, and less installation space. The overall coaxiality is high, requiring no additional centering during assembly, resulting in low operating vibration and noise, and good overall stability and reliability, making it suitable for various water supply and drainage conditions.

Description

Technical Field

[0001] This invention relates to the field of water supply and drainage pump equipment technology, and in particular to a coaxial double-suction electric pump set. Background Technology

[0002] The structure of a traditional electric pump set is as follows: Figure 1 As shown, the system includes a water pump 1 and a motor 2, which are separate units connected by a coupling 3. The motor 2 transmits power to the pump shaft 4 of the water pump 1 via the coupling 3, driving the impeller 5 mounted on it to rotate synchronously. The rotor of the water pump 1 is supported by bearing housings 6 located at both ends of the water pump 1. Each end of the water pump 1 is equipped with a mechanical seal 7 to achieve sealing between the internal medium of the pump body and the external structure.

[0003] Existing traditional split-type electric pump sets have many parts, large axial dimensions, and high manufacturing costs. During installation, the coupling 3 needs to be repeatedly aligned and adjusted, which is cumbersome and prone to concentricity deviation. The equipment operates with large vibration and high noise, and the overall working stability and reliability are poor. Summary of the Invention

[0004] This invention provides a coaxial double-suction electric pump set to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention provides a coaxial double-suction electric pump set, including a double-suction water pump, a three-phase motor, and a rigid common base.

[0006] The three-phase motor is equipped with an extended main shaft, which extends directly into the pump body of the double-suction water pump.

[0007] The double-suction water pump includes a pump casing, an impeller installed inside the pump casing, and a single mechanical seal; the impeller is fixedly mounted on the extended main shaft, and is directly supported and driven to rotate by the extended main shaft; the mechanical seal is located at the connection point between the double-suction water pump and the three-phase motor;

[0008] The double-suction water pump and the three-phase motor are not connected by a coupling; both are fixedly mounted on the rigid common base.

[0009] Preferably, the extended spindle is an integrally formed through shaft, which simultaneously constitutes the rotating spindle of the three-phase motor and the working spindle of the double-suction water pump.

[0010] Preferably, the extended spindle is formed by integral forging or rolling.

[0011] Preferably, the double-suction water pump is a horizontal split-case double-suction structure.

[0012] Preferably, the pump casing has an axial mounting opening on the side near the three-phase motor, and the extended main shaft extends into the pump body of the double-suction water pump from the axial mounting opening.

[0013] Preferably, the mechanical seal is installed at the axial assembly opening.

[0014] Preferably, the rigid common base is integrally cast or welded from steel plates.

[0015] Preferably, the pump body feet of the double-suction water pump and the motor feet of the three-phase motor are respectively locked and fixed to the mounting surface of the rigid common base.

[0016] Compared with the prior art, the coaxial double-suction electric pump set provided by the present invention has the following advantages:

[0017] 1. This invention adopts an integrated coaxial structure with good coaxiality, stable unit operation, low vibration and noise, and high overall operational stability and reliability;

[0018] 2. The present invention has a high degree of integration, a compact structure, and a small number of parts, which effectively saves installation space and can be adapted to a variety of application scenarios;

[0019] 3. The assembly process of this invention is simple, requiring no additional centering and self-aligning operations. At the same time, the sealing and shaft system structure is reasonably designed, facilitating daily inspection and maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an existing electric pump unit;

[0021] Figure 2 This is a schematic diagram of the structure of a coaxial double-suction electric pump unit in a specific embodiment of the present invention.

[0022] Figure 1 In the middle: 1-Water pump, 2-Motor, 3-Coupling, 4-Pump shaft, 5-Impeller, 6-Bearing housing, 7-Mechanical seal;

[0023] Figure 2 In the middle: 10-Double suction water pump, 11-Pump casing, 12-Impeller, 13-Mechanical seal, 20-Three-phase motor, 21-Extended main shaft, 30-Rigid common base. Detailed Implementation

[0024] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and not to limit the scope of the invention.

[0025] The coaxial double-suction electric pump set provided by this invention, such as Figure 2As shown, the system includes a double-suction water pump 10, a three-phase motor 20, and a rigid common base 30. The three-phase motor 20 is equipped with an extended main shaft 21, which extends directly into the interior of the double-suction water pump 10. The double-suction water pump 10 includes a pump casing 11, an impeller 12 installed inside the pump casing 11, and a single mechanical seal 13. The impeller 12 is fixedly mounted on the extended main shaft 21 and is directly supported and driven to rotate by the extended main shaft 21. The integrated shaft system structure ensures the coaxiality of the entire machine. The mechanical seal 13 is located at the junction of the double-suction water pump 10 and the three-phase motor 20, with concentrated sealing points and a simple and reliable structure. There is no coupling between the double-suction water pump 10 and the three-phase motor 20; both are integrally fixed on the rigid common base 30. This integrated layout makes the overall structure more compact and significantly reduces the space occupied.

[0026] In some embodiments, the extended main shaft 21 is a one-piece molded through shaft, which simultaneously constitutes the rotating main shaft of the three-phase motor 20 and the working main shaft of the double-suction water pump 10. The entire shaft has no segmented splicing structure, strong transmission continuity, and further improves the stability and transmission efficiency of the unit operation.

[0027] In some embodiments, the extended main shaft 21 can be integrally forged or rolled, and the main shaft has high overall structural strength and uniform mechanical properties, which can stably withstand various loads generated when the impeller 12 is working, thus extending the overall service life of the equipment.

[0028] In some embodiments, the double-suction water pump 10 has a horizontal split double-suction structure, which ensures smooth water flow and high water delivery efficiency, and can meet the needs of large-flow transportation in water supply and drainage scenarios.

[0029] In some embodiments, the pump casing 11 has an axial assembly opening on the side near the three-phase motor 20, through which the extended main shaft 21 extends into the pump body of the double-suction water pump 10. This opening structure matches the shaft assembly path, simplifying assembly and facilitating component assembly. In some embodiments, the mechanical seal 13 is installed at the axial assembly opening, with the sealing position matching the assembly structure. This reliably prevents media leakage and facilitates subsequent inspection and replacement of the sealing components, resulting in convenient operation and maintenance.

[0030] In some embodiments, the rigid common base 30 is integrally cast or welded from steel plates, which has high rigidity and can effectively constrain the deformation generated during unit operation, ensuring the stability of the overall installation posture.

[0031] In some embodiments, the pump body feet of the double-suction water pump 10 and the motor feet of the three-phase motor 20 are respectively locked and fixed on the mounting surface of the rigid common base 30. By using a unified reference surface for installation and coaxial structure, no additional centering and self-aligning is required during assembly, simplifying the installation process and improving on-site assembly efficiency.

[0032] In summary, the coaxial dual-suction electric pump set provided by this invention adopts a coaxial integrated structure design, with simplified component configuration and compact layout. It has the advantages of stable operation, easy assembly and maintenance, and can be widely used in various water supply and drainage conditions.

[0033] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A coaxial double-suction electric pump set, characterized in that, Includes a double-suction water pump, a three-phase motor, and a rigid common base. The three-phase motor is equipped with an extended main shaft, which extends directly into the pump body of the double-suction water pump; The double-suction water pump includes a pump casing, an impeller installed inside the pump casing, and a single mechanical seal; the impeller is fixedly mounted on the extended main shaft, and is directly supported and driven to rotate by the extended main shaft; the mechanical seal is located at the connection point between the double-suction water pump and the three-phase motor; The double-suction water pump and the three-phase motor are not connected by a coupling; both are integrally fixed on the rigid common base.

2. The coaxial double-suction electric pump set as described in claim 1, characterized in that, The extended main shaft is a one-piece molded through shaft, which simultaneously constitutes the rotating main shaft of the three-phase motor and the working main shaft of the double-suction water pump.

3. The coaxial double-suction electric pump set as described in claim 2, characterized in that, The extended spindle is formed by integral forging or rolling.

4. The coaxial double-suction electric pump set as described in claim 1, characterized in that, The double-suction water pump is a horizontal, split-opening, double-suction structure.

5. The coaxial double-suction electric pump set as described in claim 1, characterized in that, The pump casing has an axial mounting opening on the side near the three-phase motor, and the extended main shaft extends into the pump body of the double-suction water pump from the axial mounting opening.

6. The coaxial double-suction electric pump set as described in claim 5, characterized in that, The mechanical seal is installed at the axial assembly opening.

7. The coaxial double-suction electric pump set as described in claim 1, characterized in that, The rigid common base is formed by integral casting or by welding of steel plates.

8. The coaxial double-suction electric pump set as described in claim 7, characterized in that, The pump body feet of the double-suction water pump and the motor feet of the three-phase motor are respectively locked and fixed to the mounting surface of the rigid common base.

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