Lightweight permanent magnet synchronous axial flow pump

Abstract

The utility model provides a lightweight permanent magnet synchronous axial flow pump which comprises a motor casing with a built-in permanent magnet synchronous motor, a water inlet flange with a water inlet channel and a pump casing with a water outlet which are sequentially arranged from bottom to top, the motor casing is fixedly connected with the water inlet flange, and the water inlet flange is fixedly connected with the pump casing. A rotating shaft of the permanent magnet synchronous motor is connected with an impeller, the impeller is located in an inner cavity of the pump shell, the water inlet channel is formed by the space between the impeller and the water inlet flange with the impeller as the boundary, the water outlet channel is formed by the space between the impeller and the water outlet, and the sealing cone is fixedly connected to the end, close to the impeller, of the motor shell. An inner cavity space of the sealing cone accommodates the rotating shaft as well as an engine oil seal structure and a water seal structure which are arranged on the rotating shaft in a sleeving manner, and the height of the sealing cone is required to be not in contact with the impeller after the sealing cone is mounted in place. The light-weight permanent magnet synchronous axial flow pump is light in weight and large in lift, and meets use requirements.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet flood control and drainage pump technology, and in particular to a lightweight permanent magnet synchronous axial flow pump. Background Technology

[0002] An axial flow pump is a pump that uses the force generated by the blades of a rotating impeller to transport liquid along its axis. An axial flow pump includes, from bottom to top, a motor housing containing a built-in permanent magnet synchronous motor, an inlet flange with a water inlet channel, and a pump housing with an outlet. The motor housing and the inlet flange are fixedly connected, as are the inlet flange and the pump housing. An impeller is connected to the end of the permanent magnet synchronous motor shaft, which is located inside the pump housing. The space between the impeller and the inlet flange forms the water inlet channel, and the space between the impeller and the outlet forms the water outlet channel. A filter screen is installed around the inlet flange. Because the axial flow pump is submerged in water during operation, the permanent magnet synchronous motor shaft needs to be sealed within the cylindrical motor housing using a sealing structure. This significantly increases the length and weight of the motor housing. See the patent for a floating permanent magnet synchronous axial flow pump, patent number 202121595028.6. Furthermore, the pump casing with the outlet is also cylindrical, resulting in a short head that cannot meet the requirements for high head applications. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a lightweight permanent magnet synchronous axial flow pump, which can reduce the weight of the axial flow pump, and the improved structure of the space between the impeller and the outlet significantly increases the head of the water.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A lightweight permanent magnet synchronous axial flow pump includes, from bottom to top, a motor housing with a built-in permanent magnet synchronous motor, an inlet flange with an inlet channel, and a pump housing with an outlet. The motor housing and the inlet flange are fixedly connected, and the inlet flange and the pump housing are fixedly connected. The shaft of the permanent magnet synchronous motor is connected to an impeller, which is located inside the pump housing cavity. The space between the impeller and the inlet flange forms the inlet channel, and the space between the impeller and the outlet forms the outlet channel. The pump housing also includes a sealing cone, which is fixedly connected to the end of the motor housing near the impeller. The inner cavity of the sealing cone accommodates the shaft and an oil seal structure and a water seal structure sleeved on the shaft. The height of the sealing cone is required to ensure that it does not contact the impeller after installation.

[0006] In one possible implementation, the cross-sectional area of ​​the water outlet channel formed by the space between the pump casing cavity, the impeller and the outlet gradually decreases.

[0007] In one possible implementation, the space between the pump casing cavity, the impeller and the outlet forms the axial cross-section of the outlet channel, which is divided into two axisymmetric left and right segments, each of which is a curved segment.

[0008] In one possible implementation, the curved segment is divided into a first straight segment, a second straight segment, and a third straight segment from the furthest point from the outlet end, with smooth transitions between each straight segment.

[0009] In one possible implementation, the curved segment is divided into a first elliptical segment or a first circular arc segment, a second circular arc segment or a second straight line segment, and a third circular arc segment or a third quadratic curve segment, starting from the furthest point from the outlet end, with smooth transitions between each segment.

[0010] In one possible implementation, the taper of the sealing cone is 5°-15°.

[0011] In one possible implementation, a filter screen cover is also included, comprising a left cover and a right cover, which are symmetrical about left and right and are fixed together by screws to surround the water inlet flange.

[0012] The beneficial effects of this utility model are:

[0013] Compared with existing technologies, the lightweight permanent magnet synchronous axial flow pump of this invention also includes a sealing cone, fixedly connected to the motor housing near the impeller end. The inner cavity of the sealing cone accommodates the rotating shaft and the oil seal and water seal structures sleeved on the rotating shaft, thereby shortening the cylindrical length of the motor housing and reducing its weight. Furthermore, by changing the original cylindrical shape of the pump housing, the space between the impeller and the outlet within the pump housing cavity forms a water outlet channel with a gradually decreasing cross-sectional area. The cross-sectional area is designed to gradually decrease according to the actual power of the motor and the required head, meeting the requirements for increased head. The axial cross-sectional outline of the water outlet channel within the pump housing cavity, between the impeller and the outlet, is divided into two axisymmetric segments, each a curved segment. These curved segments, starting from the furthest point from the outlet end, are sequentially divided into a first straight segment, a second straight segment, and a third straight segment. The transitions between these straight segments are smooth, simplifying manufacturing and resulting in relatively low cost.

[0014] Compared with existing technologies, the lightweight permanent magnet synchronous axial flow pump of this invention is lightweight and has a large head, which meets the requirements for use. Attached Figure Description

[0015] Figure 1 This is a perspective view of the lightweight permanent magnet synchronous axial flow pump of Example 1;

[0016] Figure 2 yes Figure 1 A front view of a lightweight permanent magnet synchronous axial flow pump;

[0017] Figure 3 yes Figure 2 A cross-sectional view of a lightweight permanent magnet synchronous axial flow pump (AA section).

[0018] Figure 4 This is a perspective view of the lightweight permanent magnet synchronous axial flow pump of Example 2;

[0019] Figure 5 yes Figure 4 A front view of a lightweight permanent magnet synchronous axial flow pump;

[0020] Figure 6 yes Figure 5 BB cross-sectional view of a lightweight permanent magnet synchronous axial flow pump.

[0021] Among them, 1-motor housing, 11-permanent magnet synchronous motor, 12-motor cable connector, 13-shaft, 14-motor base bearing, 15-motor mounting bearing, 2-inlet flange, 21-inlet channel, 3-pump housing, 31-outlet, 32-impeller, 33-outlet channel, 331-first elliptical segment of the axial section of the outlet channel, 332-second arc segment of the axial section of the outlet channel, 333-third arc segment of the axial section of the outlet channel, 331a-maximum cross-section of the outlet channel, 331b-minimum cross-section of the outlet channel (i.e., 31-outlet), 4-sealing cone, 40-bolt and nut, 41-oil seal, 42-water seal. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Example 1

[0024] Please see Figures 1 to 3This utility model provides a lightweight permanent magnet synchronous axial flow pump, comprising, from bottom to top, a motor housing with a built-in permanent magnet synchronous motor, an inlet flange with a water inlet channel, and a pump housing with a water outlet. The motor housing and the inlet flange are sealed and fixedly connected, and the inlet flange and the pump housing are fixedly connected. In this embodiment, they are integrally designed and molded. The shaft of the permanent magnet synchronous motor is connected to an impeller, which is located inside the pump housing cavity. The space between the impeller and the inlet flange forms the water inlet channel, and the space between the impeller and the water outlet forms the water outlet channel. It also includes a sealing cone. The motor housing has an opening at its upper end for mounting a sealing cone. This cone is securely connected to the motor housing near the impeller (upper end) using bolts and nuts. The diameter of the end of the sealing cone connecting to the motor housing is larger than the diameter of the other end. The inner cavity of the sealing cone accommodates the rotating shaft and the oil seal and water seal structures fitted onto it. The height of the sealing cone is required to ensure it does not contact the impeller after installation. The taper of the sealing cone is 5°-15°, and in this embodiment, it is 10°. The motor has a power of 22 kW and a head of 10 meters. The pump housing is cylindrical with a diameter of 8 inches, meaning the outlet diameter is 8 inches. Compared to a design without a motor housing, the cylindrical length is shorter, resulting in a weight reduction of approximately 10%.

[0025] Example 2

[0026] Please see Figures 4 to 6 Based on Example 1, the space between the impeller and the outlet in the pump casing cavity forms a water outlet channel with a gradually decreasing cross-sectional area. This space extends from the upper end face of the impeller to the end face of the outlet. Specifically, the axial cross-sectional outline of the water outlet channel formed by the space between the impeller and the outlet in the pump casing cavity is divided into two axisymmetric segments, each a curved segment. In this example, the curved segments, starting from the furthest point from the outlet end, are sequentially divided into a first elliptical segment, a second circular arc segment, and a third circular arc segment, with smooth transitions between each segment. The structure of the water outlet channel with a gradually decreasing cross-sectional area in the space between the impeller and the outlet in the pump casing cavity is designed according to the actual power of the motor and the required head, meeting the requirements for increased head. In this embodiment, the motor has a power of 45-55 kilowatts and a head of 45 meters. The cross-sectional area of ​​the water outlet channel formed by the space between the impeller and the outlet in the pump casing gradually decreases from large to small. The maximum diameter of the water outlet channel is 12 inches, and the diameter of the outlet is 6 inches.

[0027] In another embodiment, the segments are sequentially divided into a first circular arc segment, a second straight line segment, and a third quadratic curve segment, with smooth transitions between each segment. In another embodiment, the curve segment is sequentially divided into a first straight line segment, a second straight line segment, and a third straight line segment from the furthest point from the outlet end, with smooth transitions between each straight line segment.

[0028] Example 3

[0029] Based on Embodiment 2, the present invention provides a lightweight permanent magnet synchronous axial flow pump, which further includes a filter screen cover. The filter screen cover includes a left cover and a right cover, which are symmetrical and fixed together by screws to surround the water inlet flange. The upper and lower ends of the left cover and the right cover are respectively connected to the filter screen cover.

[0030] The lightweight permanent magnet synchronous axial flow pump provided by the embodiments of this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solution disclosed by this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A lightweight permanent magnet synchronous axial flow pump, comprising, from bottom to top, a motor housing with a built-in permanent magnet synchronous motor, an inlet flange with an inlet channel, and a pump housing with an outlet, wherein the motor housing and the inlet flange are fixedly connected, the inlet flange and the pump housing are fixedly connected, the shaft of the permanent magnet synchronous motor is connected to an impeller, the impeller is located in the inner cavity of the pump housing, the space between the impeller and the inlet flange forms the inlet channel, and the space between the impeller and the outlet forms the outlet channel, characterized in that: It also includes a sealing cone, which is fixedly connected to one end of the motor housing near the impeller. The inner cavity of the sealing cone accommodates the rotating shaft and the oil seal structure and water seal structure sleeved on the rotating shaft. The height of the sealing cone is required to not contact the impeller after it is installed in place.

2. The lightweight permanent magnet synchronous axial flow pump according to claim 1, characterized in that: The cross-sectional area of ​​the water outlet channel formed by the space between the impeller and the pump casing cavity gradually decreases from large to small.

3. A lightweight permanent magnet synchronous axial flow pump according to claim 2, characterized in that: The inner cavity of the pump casing, the space between the impeller and the outlet forms the axial cross-section of the outlet channel, which is divided into two axisymmetric left and right segments, each of which is a curved segment.

4. A lightweight permanent magnet synchronous axial flow pump according to claim 3, characterized in that: The curved segment is divided into a first straight segment, a second straight segment, and a third straight segment from the furthest point from the outlet end, with smooth transitions between each straight segment.

5. A lightweight permanent magnet synchronous axial flow pump according to claim 3, characterized in that: The curved segment is divided into a first elliptical segment or a first circular arc segment, a second circular arc segment or a second straight line segment, and a third circular arc segment or a third quadratic curve segment, starting from the furthest point from the outlet end, with smooth transitions between each segment.

6. A lightweight permanent magnet synchronous axial flow pump according to claim 1, characterized in that: The taper of the sealing cone is 5°-15°.

7. A lightweight permanent magnet synchronous axial flow pump according to claim 1 or 2, characterized in that: It also includes a filter screen, which consists of a left cover and a right cover. The left cover and the right cover are symmetrical and are fixed together by screws to surround the water inlet flange.

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