Vertical axial mixed-flow pump with novel structure

Abstract

The invention relates to a vertical shaft mixed-flow pump with a novel structure. The vertical shaft mixed-flow pump comprises a stuffing box, a bearing body component, a pump shaft, a pump body, an impeller and a motor, a pump shaft is directly connected with a motor and an impeller, a bearing body part is located on the upper portion of a stuffing box, and the bearing body part is directly and rigidly connected with a pump body through a flange structure; the bearing body part comprises at least two groups of angular contact ball bearings which are arranged back to back; the motor is installed at the upper end of the bearing body component. The bearing body part is integrated on the upper portion of the water pump layer stuffing box, a traditional motor base structure is omitted, and the pump shaft is directly connected with the motor and the impeller. According to the design, the manufacturing cost is remarkably reduced, the axial installation size is shortened, meanwhile, the vibration of equipment is reduced by optimizing an axial force transmission path, and the device is particularly suitable for pump station transformation projects with limited space.

Description

Technical Field

[0001] The invention relates to a mixed flow pump, in particular to a new structure vertical axial mixed flow pump which reduces manufacturing cost, shortens axial installation size and reduces equipment vibration by optimizing axial force transmission path. Background Art

[0002] The traditional vertical shaft mixed flow pump adopts a layered structure design, in which the bearing body component that bears the axial force is arranged inside the motor seat of the motor layer and connected to the pump shaft through the transmission shaft. This structure has the following defects:

[0003] 1. It is necessary to set up a separate motor seat to support the bearing body, which increases manufacturing cost and installation complexity;

[0004] 2. Long drive shafts are prone to vibration and centering errors, reducing operational stability;

[0005] 3. The multi-layer structure makes maintenance difficult, and multiple components need to be disassembled for inspection. Summary of the invention

[0006] In view of the above problems, the main purpose of the present invention is to provide a new structure vertical axial mixed flow pump which reduces manufacturing costs, shortens axial installation dimensions, and reduces equipment vibration by optimizing the axial force transmission path.

[0007] The present invention solves the above technical problems through the following technical solutions: a new structure vertical axial mixed flow pump, the new structure vertical axial mixed flow pump comprises: a stuffing box, a bearing body component, a pump shaft, a pump body, an impeller, and a motor.

[0008] A pump shaft is used to directly connect the motor and the impeller. The bearing body component is located on the upper part of the stuffing box. The bearing body component is directly and rigidly connected to the pump body through a flange structure. The bearing body component includes at least two sets of angular contact ball bearings, which are arranged back to back. The motor is installed on the upper end of the bearing body component.

[0009] In a specific implementation example of the present invention, the matching surfaces of the pump body and the bearing body component are provided with axial positioning stops.

[0010] In a specific implementation example of the present invention, the coaxiality error between the pump body and the bearing body component is ≤0.05mm.

[0011] In a specific implementation example of the present invention, the motor is directly mounted on the upper end of the bearing body component through a flange.

[0012] In a specific implementation example of the present invention, the bearing body component adopts a double-row angular contact ball bearing group, and the preload adjustment range is ±15%.

[0013] The positive and progressive effect of the present invention is that the new structure vertical axial mixed flow pump provided by the present invention has the following advantages compared with the common technology:

[0014] 1. Simplified structure: The motor base and transmission shaft are eliminated, the number of components is reduced by more than 30%, and the material cost is reduced by 25%-40%.

[0015] 2. Improved stability: Removing the drive shaft design reduces the vibration amplitude by more than 50%, and shortening the axial force transmission path improves the centering accuracy by 2 levels.

[0016] 3. Easy maintenance: The integrated design reduces the time spent on key component maintenance by 60% and supports online maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of common similar technologies.

[0018] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0019] The following are the names corresponding to the labels in the present invention:

[0020] Stuffing box 1, bearing body component 2, pump shaft 3, pump body 5, impeller 6, motor 7. DETAILED DESCRIPTION

[0021] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention, as shown in Figure 1 As shown, the present invention proposes a new structure vertical axial mixed flow pump, which includes: a stuffing box 1, a bearing body component 2, a pump shaft 3, a pump body 5, an impeller 6, and a motor 7. The present invention adopts a pump shaft 3 to directly connect the motor 7 and the impeller 6, the bearing body component 2 is located at the upper part of the stuffing box 1, and the bearing body component 2 is directly rigidly connected to the pump body 5 through a flange structure; the bearing body component 2 includes at least two groups of angular contact ball bearings, which are arranged back to back, and the motor 7 is installed at the upper end of the bearing body component 2.

[0023] In the specific installation process, the matching surfaces of the pump body 5 and the bearing body component 2 in the present invention are provided with axial positioning stoppers, and the coaxiality error between the pump body 5 and the bearing body component 2 is ≤0.05mm.

[0024] In a specific installation process, the motor 7 is directly installed on the upper end of the bearing body component 2 through the flange.

[0025] When the bearing body component 2 adopts a double-row angular contact ball bearing group, the preload force adjustment range is ±15%.

[0026] The present invention reduces costs and improves operational stability through structural optimization.

[0027] The present invention eliminates the motor base and the transmission shaft, reduces the number of components by more than 30%, and reduces the material cost by 25%-40%.

[0028] The present invention improves stability, removes the transmission shaft design to reduce the vibration amplitude by more than 50%, shortens the axial force transmission path, and improves the centering accuracy by 2 levels.

[0029] The present invention is more convenient to maintain, and the integrated design reduces the time spent on key component maintenance by 60%, supporting online maintenance.

[0030] The present invention eliminates the transmission shaft 4 and adopts only one pump shaft, and the diameter runout tolerance is controlled within 0.02 mm.

[0031] The present invention integrates the bearing body component on the upper part of the water pump layer stuffing box, eliminates the traditional motor seat structure, and uses a pump shaft to directly connect the motor and the impeller. This design significantly reduces manufacturing costs and shortens the axial installation size by more than 40%. At the same time, by optimizing the axial force transmission path, the vibration of the equipment is reduced by 50%, which is particularly suitable for pump station reconstruction projects with limited space.

[0032] The present invention integrates the functions of the bearing body and the stuffing box to achieve direct bearing of the axial force at the water pump layer.

[0033] The present invention adopts a three-level rigid connection of a pump body, a bearing body and a motor to eliminate the vibration defect of a traditional elastic support.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A new structure vertical axial mixed flow pump, characterized by: The novel vertical axial mixed flow pump comprises: a stuffing box (1), a bearing body component (2), a pump shaft (3), a pump body (5), an impeller (6), and a motor (7); A pump shaft (3) is directly connected to a motor (7) and an impeller (6); a bearing body component (2) is located on the upper part of a stuffing box (1); the bearing body component (2) is directly rigidly connected to a pump body (5) via a flange structure; the bearing body component (2) includes at least two groups of angular contact ball bearings, which are arranged back to back; and the motor (7) is mounted on the upper end of the bearing body component (2).

2. The novel vertical axial mixed flow pump according to claim 1 is characterized in that: The matching surfaces of the pump body (5) and the bearing body component (2) are provided with axial positioning stops.

3. The novel vertical axial mixed flow pump according to claim 2 is characterized in that: The coaxiality error between the pump body (5) and the bearing body component (2) is ≤0.05 mm.

4. The novel vertical axial mixed flow pump according to claim 1 is characterized in that: The motor (7) is directly mounted on the upper end of the bearing body component (2) via a flange.

5. The novel vertical axial mixed flow pump according to claim 1 is characterized in that: The bearing body component (2) adopts a double-row angular contact ball bearing group, and the preload adjustment range is ±15%.

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