Dry type sewage pump

Abstract

The utility model provides a kind of dry type sewage pump, belong to water pump technical field.It solves the problem of existing sewage pump influence motor life.This dry type sewage pump includes the pump body of inside for pump cavity and motor vertically arranged on pump body, motor includes with the lower bearing seat of pump body solid connection and the rotor shaft of being passed in lower bearing seat, lower bearing seat and pump body between form a cavity, pump body top wall is the bottom wall of cavity, pump body top has the through-hole for the lower end of rotor shaft to extend into pump cavity, mechanical seal and impeller being solidly connected with rotor shaft are equipped in pump cavity, mechanical seal is sleeved on rotor shaft, the static ring of mechanical seal is arranged in through-hole, baffle sleeve is equipped in cavity, baffle sleeve is sleeved on rotor shaft, interference fit is formed between baffle sleeve inner wall and rotor shaft outer side wall, through-hole is opposite baffle sleeve inner wall setting.This dry type sewage pump can prolong motor life.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and relates to a sewage pump, particularly a dry sewage pump. Background Technology

[0002] A sewage pump is a power-driven device used to transport sewage containing particles, fibers, and other liquids. It is mainly used in industrial wastewater discharge, urban sewage treatment, building drainage systems, and farmland irrigation.

[0003] Existing sewage pumps, such as the dry sewage pump disclosed in the Chinese Patent Database (application number: 202111597174.7), include a motor assembly, an upper bearing assembly, a fan, an upper cover, a lower bearing assembly, an impeller, fixing bolts, a volute, an outlet flange, and an inlet base. The motor assembly includes a rotating shaft, a rotor, a motor housing, and a stator. The fan, the upper bearing assembly, the rotor, the lower bearing assembly, and the mechanical seal are respectively fitted onto the upper end of the rotating shaft from top to bottom and can rotate with the rotating shaft. The upper cover is connected to the motor housing, and the motor housing is connected to the upper end of the lower bearing assembly. The bearing seat is supported above the volute, and its lower end is embedded inside the volute. The lower end of the rotating shaft is inserted into the volute until... The lower end of the lower bearing assembly is supported and connected to the bearing seat. The impeller is installed on the lower end of the rotating shaft by the fixing bolt and is located inside the volute. The water outlet flange and the water inlet base are respectively located on the periphery and bottom end of the volute. The lower end of the rotating shaft is tapered. The impeller mounting hole is a straight hole design. The sewage pump also includes an impeller tapered sleeve and a sealing gasket. The impeller tapered sleeve is fitted onto the tapered part of the lower end of the rotating shaft. After the fixing bolt passes through the sealing gasket and the impeller tapered sleeve, it fixes the impeller to the tapered part of the lower end of the rotating shaft. The impeller tapered sleeve has expansion locking slits evenly spaced, so that when the impeller is locked to the tapered part of the lower end of the rotating shaft, it can move up and down in the axial direction of the rotating shaft to allow larger particles to pass through.

[0004] In actual use, mechanical seals are easily damaged by mud and sand. Once damaged, the high-pressure fluid inside the volute can penetrate the mechanical seal and impact the lower bearing housing at high speed, eventually causing water to enter and damage the motor. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a dry sewage pump that can extend the life of the motor.

[0006] The objective of this utility model can be achieved through the following technical solution: A dry sewage pump includes a pump body with an internal pump cavity and a motor vertically mounted on the pump body. The motor includes a lower bearing housing fixedly connected to the pump body and a rotor shaft passing through the lower bearing housing. A cavity is formed between the lower bearing housing and the pump body, and the top wall of the pump body is the bottom wall of the cavity. The top of the pump body has a through hole for the lower end of the rotor shaft to extend into the pump cavity. A mechanical seal and an impeller fixedly connected to the rotor shaft are provided in the pump cavity. The mechanical seal is fitted on the rotor shaft, and the stationary ring of the mechanical seal is disposed in the through hole. The feature is that a retaining sleeve is provided in the cavity, the retaining sleeve is fitted on the rotor shaft, and an interference fit is formed between the inner wall of the retaining sleeve and the outer wall of the rotor shaft. The through hole is positioned directly opposite the inner wall of the retaining sleeve.

[0007] When the mechanical seal is damaged, the high-pressure fluid in the pump chamber will be sprayed upwards into the cavity through the mechanical seal and blocked and depressurized by the retaining sleeve. This effectively prevents the high-pressure fluid from rushing into the bearing housing and causing water to enter the motor, thus extending the motor's life.

[0008] In the aforementioned dry sewage pump, an annular limiting seat is formed on the outer wall of the rotor shaft. The limiting seat and the rotor shaft are coaxially arranged, and the top wall of the retaining sleeve presses against the limiting seat. The limiting seat is provided to restrict the upward movement of the retaining sleeve. This facilitates the assembly of the retaining sleeve and prevents it from shifting due to impact, ensuring its stable pressure relief function and achieving the goal of extending the motor's lifespan.

[0009] In the aforementioned dry sewage pump, an integrally formed pipe extends upward from the top wall of the pump body. The axial cross-section of the pipe is inverted L-shaped, and the inner bore of the pipe is the aforementioned through hole. The protruding pipe on the pump body is used to install the mechanical seal, thus reducing the pump chamber volume and lowering costs.

[0010] In the aforementioned dry sewage pump, the lower end of the baffle sleeve is fitted over the upper end of the pipe, and there is an annular gap between the baffle sleeve and the pipe that is coaxial with the baffle sleeve, so as to form a more effective barrier.

[0011] In the aforementioned dry sewage pump, the baffle consists of a sleeve and a retaining ring formed on the outer wall of the sleeve. The axial cross-section of the retaining ring is inverted L-shaped, with the lower end of the retaining ring fitting outside the sleeve. An interference fit is formed between the inner wall of the sleeve and the outer wall of the rotor shaft. This design simultaneously increases the depth of the baffle's inner bore and the contact area between the baffle and the rotor shaft, thus better preventing high-pressure fluid from flowing through it.

[0012] In the aforementioned dry sewage pump, a ring of ribs is formed on the inner side of the top wall of the baffle. The ring of ribs is evenly distributed around the circumference of the baffle, and the two ends of the ribs extend to the outer wall of the sleeve and the inner wall of the retaining ring, respectively, to enhance the overall strength of the baffle.

[0013] Compared with existing technologies, this dry sewage pump has the following advantages:

[0014] 1. During use, when the mechanical seal is damaged, the high-pressure fluid in the pump chamber will be sprayed upward into the cavity through the mechanical seal and blocked and depressurized by the retaining sleeve, which effectively prevents the high-pressure fluid from rushing into the bearing housing and causing water to enter the motor, thus extending the motor's life.

[0015] 2. A limit seat is set to restrict the upward movement of the retaining sleeve. This not only facilitates the assembly of the retaining sleeve, but also prevents the retaining sleeve from being displaced by impact, so that it can stably perform its pressure relief function and achieve the goal of extending the motor life. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of this dry sewage pump.

[0017] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 This is a 3D schematic diagram of the gear cover.

[0019] In the diagram, 1 is the pump body; 1a is the pump chamber; 1b is the pipe section; 2 is the motor; 3 is the lower bearing housing; 4 is the rotor shaft; 4a is the limit seat; 5 is the oil seal; 6 is the cavity; 7 is the mechanical seal; 7a is the stationary ring; 7b is the rotating ring; 8 is the impeller; 9 is the retaining sleeve; 9a is the sleeve; 9b is the retaining ring; and 9c is the rib. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] like Figure 1 As shown, this dry sewage pump includes a pump body 1 with an internal pump chamber 1a and a motor 2 vertically mounted on the pump body 1. The pump body 1 has an inlet at its bottom and an outlet on its side, both of which are connected to the pump chamber 1a.

[0022] Specifically

[0023] Motor 2 is a standard three-phase motor, comprising a lower bearing housing 3 fixedly connected to the pump body 1 and a rotor shaft 4 passing through the lower bearing housing 3. The upper end of the lower bearing housing 3 is rotatably fitted to the rotor shaft 4 via a bearing, and the lower end of the lower bearing housing 3 is sealed to the rotor shaft 4 via an oil seal 5. A cavity 6 is formed between the lower bearing housing 3 and the pump body 1, with the top wall of the pump body 1 serving as the bottom wall of the cavity 6. Figure 1 and Figure 2As shown, the pump body 1 has a through hole at its top for the lower end of the rotor shaft 4 to extend into the pump chamber 1a. The pump chamber 1a contains a mechanical seal 7 and an impeller 8 fixedly connected to the rotor shaft 4, with the mechanical seal 7 mounted on the rotor shaft 4. The mechanical seal 7 is an existing product, and in this embodiment, a single-end mechanical seal 7 is used. This mechanical seal 7 includes a stationary ring 7a and a rotating ring 7b. The stationary ring 7a is disposed within the through hole, and the rotating ring 7b is fixedly connected to the rotor shaft 4 so that the rotating ring 7b rotates with the rotor shaft 4. Preferably, the end of the rotating ring 7b furthest from the stationary ring 7a presses against the impeller 8.

[0024] like Figures 1 to 3 As shown, a retaining sleeve 9 is provided inside the cavity 6, and the retaining sleeve 9 and the rotor shaft 4 are coaxially arranged. The retaining sleeve 9 is fitted onto the rotor shaft 4, and an interference fit is formed between the inner wall of the retaining sleeve 9 and the outer wall of the rotor shaft 4. The aforementioned through hole is positioned directly opposite the inner wall of the retaining sleeve 9. In use, when the mechanical seal 7 is damaged, the high-pressure fluid in the pump chamber 1a is sprayed upward into the cavity 6 through the mechanical seal 7 and is blocked and depressurized by the retaining sleeve 9, effectively preventing the high-pressure fluid from rushing towards the bearing housing and causing water to enter the motor 2, thus extending the service life of the motor 2.

[0025] To further explain, an annular limiting seat 4a is formed on the outer wall of the rotor shaft 4. The limiting seat 4a is coaxially arranged with the rotor shaft 4, and the top wall of the retaining sleeve 9 presses against the limiting seat 4a. The limiting seat 4a is set to restrict the upward movement of the retaining sleeve 9. This not only facilitates the assembly of the retaining sleeve 9, but also prevents the retaining sleeve 9 from being displaced by impact, so that it can stably perform its pressure relief function and stably achieve the purpose of extending the service life of the motor 2.

[0026] In this embodiment,

[0027] The through-hole forming method is as follows: A tube 1b is integrally formed by extending upwards from the top wall of the pump body 1. The axial cross-section of the tube 1b is inverted L-shaped, and the inner hole of the tube 1b is the aforementioned through-hole. A protruding tube 1b is provided on the pump body 1 to install the mechanical seal 7, thus reducing the volume of the pump chamber 1a and lowering costs. At this time, the lower end of the retaining sleeve 9 is fitted over the upper end of the tube 1b, and an annular gap coaxial with the retaining sleeve 9 exists between the retaining sleeve 9 and the tube 1b to form a more effective barrier.

[0028] like Figure 2 and Figure 3As shown, the specific structure of the retaining sleeve 9 is as follows: The retaining sleeve 9 is an integral structure, consisting of a sleeve 9a and a retaining ring 9b formed on the outer wall of the sleeve 9a. The axial cross-section of the retaining ring 9b is inverted L-shaped. The lower end of the retaining ring 9b fits over the tube 1b, and an interference fit is formed between the inner wall of the sleeve 9a and the outer wall of the rotor shaft 4. This design simultaneously increases the inner depth of the retaining sleeve 9 and the contact area between the retaining sleeve 9 and the rotor shaft 4, thus better blocking high-pressure fluid. Preferably, a ring of ribs 9c is formed on the inner side of the top wall of the retaining sleeve 9. The ring of ribs 9c is evenly distributed around the circumference of the retaining sleeve 9, and both ends of the ribs 9c extend to the outer wall of the sleeve 9a and the inner wall of the retaining ring 9b, respectively, to enhance the overall strength of the retaining sleeve 9.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A dry sewage pump, comprising a pump body (1) with an internal pump chamber (1a) and a motor (2) vertically mounted on the pump body (1), the motor (2) comprising a lower bearing housing (3) fixedly connected to the pump body (1) and a rotor shaft (4) passing through the lower bearing housing (3), a cavity (6) being formed between the lower bearing housing (3) and the pump body (1), and the top wall of the pump body (1) being the bottom wall of the cavity (6), the top of the pump body (1) having a through hole for the lower end of the rotor shaft (4) to extend into the pump chamber (1a), a mechanical seal (7) and an impeller (8) fixedly connected to the rotor shaft (4) being provided in the pump chamber (1a), the mechanical seal (7) being fitted on the rotor shaft (4), and the stationary ring (7a) of the mechanical seal (7) being disposed in the through hole, characterized in that, A retaining sleeve (9) is provided inside the cavity (6). The retaining sleeve (9) is fitted on the rotor shaft (4), and an interference fit is formed between the inner wall of the retaining sleeve (9) and the outer wall of the rotor shaft (4). The aforementioned through hole is set directly opposite the inner wall of the retaining sleeve (9).

2. The dry sewage pump according to claim 1, characterized in that, The outer wall of the rotor shaft (4) is formed with an annular limiting seat (4a). The limiting seat (4a) and the rotor shaft (4) are coaxially arranged, and the top wall of the retaining sleeve (9) presses against the limiting seat (4a).

3. The dry sewage pump according to claim 1 or 2, characterized in that, The pump body (1) has an integrally formed tube (1b) extending upward from the top wall. The axial cross section of the tube (1b) is inverted L-shaped, and the inner hole of the tube (1b) is the aforementioned through hole.

4. The dry sewage pump according to claim 3, characterized in that, The lower end of the retainer (9) is fitted over the upper end of the tube (1b), and there is an annular gap between the retainer (9) and the tube (1b) that is coaxial with the retainer (9).

5. The dry sewage pump according to claim 4, characterized in that, The retaining sleeve (9) consists of a sleeve (9a) and a retaining ring (9b) formed on the outer side wall of the sleeve (9a). The axial cross section of the retaining ring (9b) is inverted L-shaped. The lower end of the retaining ring (9b) is sleeved outside the tube (1b). An interference fit is formed between the inner side wall of the sleeve (9a) and the outer side wall of the rotor shaft (4).

6. The dry sewage pump according to claim 5, characterized in that, A ring of ribs (9c) is formed on the inner side of the top wall of the retainer (9). The ring of ribs (9c) is evenly distributed around the circumference of the retainer (9), and the two ends of the ribs (9c) extend to the outer wall of the sleeve (9a) and the inner wall of the retaining ring (9b), respectively.

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