Connecting structure for motor stator and pump body of submersible sewage pump

Abstract

The utility model provides a connecting structure for a motor stator and a pump body of a submersible sewage pump, which comprises a stator and a connecting seat, the stator and the connecting seat are sleeved on the outer side of a pump shaft, the stator, the connecting seat and the pump body are sequentially arranged from top to bottom, and a connecting flange is arranged on the outer side of the connecting seat. The lower end of the stator and the upper end of the pump body are fixedly connected with the connecting flange through screws, the connecting base comprises a first cavity and a second cavity which are vertically arranged in a spaced mode, the first cavity and the second cavity are separated through a partition plate, a motor lower bearing is installed in the first cavity, and machine oil is injected into the second cavity through an oil hole of the connecting base. The second cavity is provided with a double-end-face mechanical seal; the connecting base and the pump cover are arranged into a whole through the single flange, the machine shell is lengthened, the upper side of the single flange of the connecting base is enveloped by the machine shell, exposed screws are reduced, double-end-face mechanical sealing is introduced, the axial size is reduced, and the connecting base and the peripheral structure become compact.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage pumps, in particular to a connection structure between a motor stator and a pump body of a submersible sewage pump. Background Art

[0002] The existing submersible sewage pump is equipped with a connecting seat and a pump cover between the stator and the pump body. Figure 1 , Figure 1 The accompanying drawings are denoted as follows:

[0003] 1 bearing, 2 connecting seat, 3 single end mechanical seal, 4 lower screw, 5 pump body,

[0004] 6 single-end mechanical seal, 7 pump cover, 8 upper screws, 9 stator;

[0005] Among them, the stator 9, the connecting seat 2 and the pump cover 7 are fixedly connected by the upper screws 8, and the pump cover 7 and the pump body 5 are fixedly connected by the lower screws 4. The upper screws 8 and the lower screws 4 are both exposed structures, which makes the connecting seat 2 and the surrounding structure too redundant. In actual use, they occupy an unnecessarily large volume. Therefore, a compact motor stator and pump body connection structure is needed. Summary of the invention

[0006] The utility model aims to provide a connection structure between a motor stator and a pump body of a submersible sewage pump.

[0007] In order to achieve the above purpose, the technical solution of the utility model is:

[0008] A connection structure between a motor stator and a pump body of a submersible sewage pump, characterized in that it includes a stator and a connecting seat, wherein the stator and the connecting seat are both sleeved on the outer side of a pump shaft, the stator, the connecting seat and the pump body are arranged in sequence from top to bottom, a connecting flange is provided on the outer side of the connecting seat, the lower end of the stator and the upper end of the pump body are fixedly connected to the connecting flange by screws, the connecting seat includes a first cavity and a second cavity arranged at an interval up and down, the first cavity and the second cavity are separated by a partition, the first cavity is installed with a lower bearing of the motor, mechanical oil is injected into the second cavity through the oil hole of the connecting seat, and a double-end mechanical seal is installed in the second cavity.

[0009] Furthermore, a mechanical seal seat is provided between the lower end of the second cavity and the upper end of the pump body, the outer side of the mechanical seal seat is fixedly connected to the lower end of the second cavity by screws, and the inner side of the upper end of the mechanical seal seat is positioned in cooperation with the lower end of the double-end mechanical seal.

[0010] Furthermore, a third stop is provided on the inner wall of the lower end of the second cavity, and the front end of the machine seal seat cooperates with the third stop for positioning.

[0011] Furthermore, a groove is provided on the inner side of the lower end of the mechanical seal seat, and a skeleton oil seal is provided in the groove.

[0012] Furthermore, a first stop is provided at the upper end of the connecting flange, and the first stop is matched with the inner wall of the lower end of the stator for positioning.

[0013] Furthermore, a second stop is provided at the lower end of the connecting flange, and the second stop is positioned in cooperation with the inner wall of the upper end of the pump body.

[0014] Furthermore, the oil hole is arranged to penetrate the connecting flange in a radial direction.

[0015] The utility model integrates the connection seat and the pump cover through a single flange, extends the casing, and the upper side of the single flange of the connection seat is enveloped by the casing, reducing exposed screws, while introducing a double-end mechanical seal, reducing the axial size, and making the connection seat and the surrounding structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an assembly structure diagram of a prior art sewage pump motor stator and a pump body;

[0017] Figure 2 This is the assembly structure diagram of the utility model and the pump body;

[0018] Figure 3 It is a structural diagram of the connecting seat of the utility model.

[0019] Reference numerals:

[0020] 10 motor lower bearing, 11 stator, 12 double end mechanical seal, 13 screw,

[0021] 14 pump body, 15 machine seal seat, 16 skeleton oil seal, 17 connecting seat,

[0022] 18 first cavity, 19 first stopper, 20 flange, 21 second stopper,

[0023] 22 the third stopper, 23 the second cavity, 24 the oil hole. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model discloses a connection structure between a motor stator and a pump body of a submersible sewage pump. Figure 2As shown, it includes a stator 11 and a connecting seat 17, both of which are sleeved on the outside of the pump shaft. The stator 11, the connecting seat 17 and the pump body 14 are arranged in sequence from top to bottom. A connecting flange 20 is provided on the outside of the connecting seat 17. The lower end of the stator 11 and the upper end of the pump body 14 are fixedly connected to the connecting flange 20 by screws 13, and the upper end of the connecting flange 20 is completely enveloped by the stator 11 shell.

[0026] A first stop 19 is provided at the upper end of the connecting flange 20 , and the first stop 19 is positioned in cooperation with the inner wall of the lower end of the stator 11 . A second stop 21 is provided at the lower end of the connecting flange 20 , and the second stop 21 is positioned in cooperation with the inner wall of the upper end of the pump body 14 .

[0027] like Figure 3 As shown, the connecting seat 17 includes a first cavity 18 and a second cavity 23 which are spaced apart from each other. The first cavity 18 and the second cavity 23 are separated by a partition. The first cavity 18 is installed with the lower bearing 10 of the motor, and the second cavity 23 is installed with the double-end mechanical seal 12. Mechanical oil is injected into the second cavity 23 through the oil hole 24 of the connecting seat 17. The oil hole 24 is arranged to radially penetrate the connecting flange 20. The mechanical oil injected into the oil hole 24 is used to lubricate the double-end mechanical seal 12 and cool part of the temperature rise conducted by the pump shaft.

[0028] A machine seal seat 15 is provided between the lower end of the second cavity 23 and the upper end of the pump body 14. The outer side of the machine seal seat 15 is fixedly connected to the lower end of the second cavity 23 by screws. The inner wall of the lower end of the second cavity 23 is provided with a third stop 22. The front end of the machine seal seat 15 is positioned in cooperation with the third stop 22, and the inner side of the upper end of the machine seal seat 15 is positioned in cooperation with the lower end of the double-end mechanical seal 12.

[0029] A groove is provided on the inner side of the lower end of the mechanical seal seat 15 , and a skeleton oil seal 16 is provided in the groove. The skeleton oil seal 16 is used to prevent mud and sand from entering the tiny space between the double-end mechanical seal 12 and the pump shaft, thereby extending the service life of the double-end mechanical seal 12 .

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A connection structure between a submersible sewage pump motor stator and a pump body, characterized in that: It includes a stator and a connecting seat, both of which are sleeved on the outside of the pump shaft, and the stator, the connecting seat and the pump body are arranged in sequence from top to bottom. A connecting flange is provided on the outside of the connecting seat, and the lower end of the stator and the upper end of the pump body are fixedly connected to the connecting flange by screws. The connecting seat includes a first cavity and a second cavity arranged at an interval from top to bottom, and the first cavity and the second cavity are separated by a partition. The first cavity is installed with a lower bearing of the motor, and mechanical oil is injected into the second cavity through the oil hole of the connecting seat, and a double-end mechanical seal is installed in the second cavity.

2. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 1, characterized in that: A mechanical seal seat is provided between the lower end of the second cavity and the upper end of the pump body. The outer side of the mechanical seal seat is fixedly connected to the lower end of the second cavity by screws, and the inner side of the upper end of the mechanical seal seat is positioned in cooperation with the lower end of the double-end mechanical seal.

3. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 2, characterized in that: The inner wall of the lower end of the second cavity is provided with a third stopper, and the front end of the machine seal seat cooperates with the third stopper for positioning.

4. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 2, characterized in that: A groove is arranged on the inner side of the lower end of the mechanical seal seat, and a skeleton oil seal is arranged in the groove.

5. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 1, characterized in that: The upper end of the connecting flange is provided with a first stopper, and the first stopper cooperates with the inner wall of the lower end of the stator for positioning.

6. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 1, characterized in that: The lower end of the connecting flange is provided with a second stopper, and the second stopper cooperates with the inner wall of the upper end of the pump body for positioning.

7. The connection structure between the motor stator and the pump body of a submersible sewage pump according to claim 1, characterized in that: The oil hole is arranged to penetrate the connecting flange in a radial direction.

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