A sewage pump motor

Abstract

This utility model provides a sewage pump motor, belonging to the field of mechanical technology. It solves the problem of inconvenient disassembly of existing motors. The sewage pump motor includes a lower bearing housing, a casing fixed to the lower bearing housing with screws, and a rotor shaft vertically disposed within the casing. The lower end of the rotor shaft passes through the lower bearing housing, and the two are rotatably engaged via the lower bearing. An upper bearing housing, coaxial with the rotor shaft, is integrally formed on the inner wall of the casing at the upper end. The upper bearing housing has a through-hole coaxial with the upper bearing housing. The upper end of the rotor shaft is inserted into the central hole, which contains a rolling bearing. The rolling bearing includes an inner ring and an outer ring, both of which are fixed to the inner wall of the central hole and the outer wall of the rotor shaft respectively by an interference fit. The outer diameter of the inner ring is smaller than the diameter of the central hole. A sealing plate is detachably fixed to the top of the casing to close the upper opening of the central hole. This sewage pump motor is easy to disassemble.

Description

Technical Field

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

[0002] A sewage pump is a fluid machine specifically designed for conveying sewage or waste liquid containing impurities such as solid particles and fibers. Its structure is as disclosed in the Chinese Patent Database for a lightweight high-strength submersible sewage pump (application number: 202221648860.2), which includes a motor housing, a motor top cover, and a pump body. A stator is installed inside the motor housing, and a rotor is installed inside the stator. The top of the rotor is installed on one side of the motor housing, and the pump body is installed on the other side of the motor housing. A mechanical seal structure and an impeller are installed on the outer side of the bottom of the rotor in an up-and-down arrangement. An oil chamber cover is installed inside the pump body, and the inner side of the oil chamber cover is fitted onto the outer side of the rotor.

[0003] During long-term operation, the motor of a sewage pump may fail, necessitating disassembly for repair. During disassembly, tools are used to pull out the top cover along with the motor housing. Because the top cover and motor rotor shaft are connected by bearings, and the friction between the bearings and both the top cover and rotor shaft is almost uniform, pulling the top cover can cause misalignment between the inner and outer rings of the bearings. This not only leads to relative displacement between the bearings and the top cover but also damages the bearings. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a sewage pump motor that is easy to disassemble and causes minimal damage.

[0005] The objective of this utility model can be achieved through the following technical solution: a sewage pump motor, comprising a lower bearing housing, a barrel fixed to the lower bearing housing by screws, and a rotor shaft vertically disposed inside the barrel. The lower end of the rotor shaft passes through the lower bearing housing, and the two are rotatably coupled through the lower bearing. The feature is that an upper bearing housing coaxial with the rotor shaft is integrally formed on the inner wall of the barrel at the upper port. The upper bearing housing has a through-hole coaxial with the upper bearing housing. The upper end of the rotor shaft is inserted into the central hole. A rolling bearing is disposed in the central hole. The rolling bearing includes an inner ring and an outer ring, and the outer ring and the inner ring are respectively fixed to the inner wall of the central hole and the outer wall of the rotor shaft by interference fit. The outer diameter of the inner ring is smaller than the diameter of the central hole. A sealing plate that closes the upper opening of the central hole is detachably fixed on the top of the barrel.

[0006] The outer diameter of the inner ring of the rolling bearing is set smaller than the diameter of the center hole. This way, after the sealing plate is removed, the inner ring is directly exposed, allowing the tool to directly press down on the inner ring to separate the barrel and rotor shaft. This not only facilitates disassembly but also reduces damage to the rolling bearing during disassembly.

[0007] In the aforementioned sewage pump motor, the upper bearing housing includes a base ring horizontally formed on the inner wall of the barrel and a connecting ring vertically formed on the bottom wall of the base ring, and the inner holes of the base ring and the connecting ring together form the aforementioned central hole; the rolling bearing is disposed inside the connecting ring, and the aforementioned sealing plate is horizontally disposed inside the upper port of the barrel and pressed against the base ring, so that the sealing plate is installed in place at one time, which facilitates assembly.

[0008] In the aforementioned sewage pump motor, the inner diameter of the connecting ring is larger than that of the base ring, making the central hole stepped. The top wall of the outer ring presses against the bottom wall of the base ring, and the outer wall of the rotor shaft has an annular shoulder surface for the bottom wall of the inner ring to press against. This design not only restricts the rolling bearings axially, improving the smoothness of rotor shaft operation, but also allows the rotor shaft to move smoothly and synchronously downwards along with the rolling bearings during disassembly, further facilitating disassembly.

[0009] In the aforementioned sewage pump motor, the sealing plate and the base ring are detachably fixed together.

[0010] In the aforementioned sewage pump motor, the sealing plate is detachably fixed to the base ring by a ring of vertically arranged bolts, with the bolt heads facing upwards to facilitate the installation and removal of the sealing plate.

[0011] In the aforementioned sewage pump motor, the top wall of the base ring is provided with threaded holes that mate with bolts, and a ring of protruding posts is vertically formed on the bottom wall of the base ring. The number of threaded holes, bolts, and protruding posts are the same and their positions correspond one-to-one. The lower end of the threaded hole extends to the corresponding protruding post.

[0012] In the aforementioned sewage pump motor, one side of the protruding post extends to the outer wall of the connecting ring.

[0013] The protruding post can extend the length of the threaded hole, increase the positioning strength of the sealing plate, and also form a reinforcing rib-like function to enhance the strength of the connecting ring and better support the limiting rolling bearing.

[0014] In the aforementioned sewage pump motor, an annular groove coaxial with the base ring is formed on the top surface of the base ring, and the bolt is located outside the annular groove; a rubber ring is provided inside the annular groove, and the two ends of the rubber ring contact and seal with the bottom wall of the annular groove and the sealing plate, respectively. The rubber ring is provided to enhance the sealing effect of the upper port of the central hole.

[0015] In the aforementioned sewage pump motor, the bottom wall of the sealing plate extends downward to form a guide ring that matches the inner hole of the base ring. The guide ring is inserted into the inner hole of the base ring to guide the installation of the sealing plate, further facilitating the assembly and disassembly of the sealing plate.

[0016] In the aforementioned sewage pump motor, the axial cross-section of the annular groove is L-shaped, and the inner wall of the rubber ring contacts and seals with the outer wall of the guide ring to increase the sealing path formed between the sealing plate and the base ring, thereby further enhancing the effect of sealing the upper port of the central hole.

[0017] As an alternative, in the aforementioned sewage pump motor, the sealing plate is threaded into the upper port of the barrel.

[0018] Compared with existing technologies, the motor of this sewage pump has the following advantages:

[0019] 1. Set the outer diameter of the inner ring of the rolling bearing to be smaller than the diameter of the center hole. This way, after removing the sealing plate, the inner ring is directly exposed, allowing the tool to directly press down on the inner ring to separate the barrel and rotor shaft. This not only facilitates disassembly but also reduces damage to the rolling bearing during disassembly.

[0020] 2. Setting a protruding post can not only extend the length of the threaded hole and increase the positioning strength of the sealing plate, but also form a function similar to a reinforcing rib to enhance the strength of the connecting ring and better support the limiting rolling bearing. Attached Figure Description

[0021] Figure 1 This is a 3D schematic diagram of the motor of this sewage pump.

[0022] Figure 2 This is a cross-sectional schematic diagram of the motor of this sewage pump.

[0023] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0024] Figure 4 This is a three-dimensional schematic diagram of the barrel.

[0025] Figure 5 It is a three-dimensional schematic diagram of the barrel in another direction.

[0026] Figure 6 This is a schematic diagram of a sewage pump.

[0027] In the diagram, 1. Lower bearing housing; 2. Machine barrel; 2a. Upper bearing housing; 2b. Center hole; 2c. Base ring; 2d. Connecting ring; 2e. Threaded hole; 2f. Protrusion; 3. Rotor shaft; 3a. Shaft shoulder surface; 4. Lower bearing; 5. Rolling bearing; 5a. Inner ring; 5b. Outer ring; 6. Sealing plate; 6a. Guide ring; 7. Bolt; 8. Rubber ring. Detailed Implementation

[0028] 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.

[0029] Example 1: As Figure 1 , Figure 2 and Figure 6 As shown, the sewage pump motor includes a lower bearing housing 1, a barrel 2, a stator assembly, and a rotor assembly.

[0030] in,

[0031] The barrel 2 is vertically positioned and open at both ends. The lower end of the barrel 2 presses against the lower bearing seat 1, and the barrel 2 is fixed to the lower bearing seat 1 by a ring of vertically positioned screws.

[0032] Both the stator assembly and the rotor assembly are housed within the casing 2. The stator assembly is fixed to the inner wall of the casing 2, and the rotor assembly includes a vertically arranged rotor shaft 3. The lower end of the rotor shaft 3 passes through the lower bearing housing 1, and the two are rotatably engaged by the lower bearing 4. The installation methods of the stator assembly, rotor assembly, and lower bearing 4 are all existing conventional technologies and will not be described in detail here.

[0033] like Figure 2 and Figure 3 As shown, an upper bearing seat 2a, coaxial with the rotor shaft 3, is integrally formed on the inner wall of the barrel 2 at the upper port. The upper bearing seat 2a has a through-hole 2b coaxial with the upper bearing seat 2a. The upper end of the rotor shaft 3 is inserted into the central hole 2b, and a rolling bearing 5 is provided in the central hole 2b. The rolling bearing 5 is an existing product, which includes an inner ring 5a fixedly connected to the rotor shaft 3 and an outer ring 5b fixedly connected to the inner wall of the central hole 2b. The outer diameter of the inner ring 5a is smaller than the diameter of the central hole 2b. In the actual product, the inner ring 5a and the outer ring 5b are fixedly connected to the outer wall of the rotor shaft 3 and the inner wall of the central hole 2b respectively by interference fit. A sealing plate 6 is detachably fixed to the top of the barrel 2 to close the upper opening of the central hole 2b.

[0034] The outer diameter of the inner ring 5a of the rolling bearing 5 is set smaller than the diameter of the center hole 2b. This way, after the sealing plate 6 is removed, the inner ring 5a is directly exposed, allowing the tool to directly press down on the inner ring 5a to separate the barrel 2 and the rotor shaft 3. This not only facilitates disassembly but also reduces damage to the rolling bearing 5 during disassembly.

[0035] In this embodiment,

[0036] like Figures 2 to 5 As shown, the specific structure of the upper bearing housing 2a is as follows: it includes a base ring 2c horizontally formed on the inner wall of the barrel 2 and a connecting ring 2d vertically formed on the bottom wall of the base ring 2c. The base ring 2c and the connecting ring 2d are coaxially arranged, and the inner holes of the base ring 2c and the connecting ring 2d together form the aforementioned central hole 2b. At this time, the rolling bearing 5 is set inside the connecting ring 2d, and the sealing plate 6 is horizontally set inside the upper port of the barrel 2 and pressed on the base ring 2c, so that the sealing plate 6 can be installed in place at one time, which is convenient for assembly.

[0037] To further explain, the inner diameter of the connecting ring 2d is larger than the inner diameter of the base ring 2c, making the aforementioned central hole 2b stepped. In this case, the diameter of the central hole 2b is smaller at the top and larger at the bottom, and the outer diameter of the inner ring 5a is smaller than the inner diameter of the base ring 2c. The top wall of the outer ring 5b presses against the bottom wall of the base ring 2c, and the outer wall of the rotor shaft 3 has an annular shoulder surface 3a for the bottom wall of the inner ring 5a to press against. This not only restricts the rolling bearing 5 axially, improving the smoothness of the rotor shaft 3's operation, but also allows the rotor shaft 3 to move smoothly and synchronously downwards with the rolling bearing 5 during disassembly, further facilitating disassembly.

[0038] like Figure 2 , Figure 3 and Figure 4 As shown, the sealing plate 6 and the base ring 2c are detachably fixed together. Preferably, the sealing plate 6 is detachably fixed to the base ring 2c by a ring of vertically arranged bolts 7, with the bolt heads facing upwards, to facilitate the assembly and disassembly of the sealing plate 6. Specifically, a ring of through holes runs vertically through the sealing plate 6, and the top wall of the base ring 2c has threaded holes 2e that mate with the bolts 7. The number of through holes, threaded holes 2e, and bolts 7 are the same, and their positions correspond one-to-one. Each through hole contains a bolt 7, the shank of which is screwed into the corresponding threaded hole 2e, and the head of the bolt 7 presses against the upper side of the sealing plate 6. Further, a ring of protruding posts 2f is vertically formed on the bottom wall of the base ring 2c. The number of threaded holes 2e, bolts 7, and protruding posts 2f are the same, and their positions correspond one-to-one. The lower end of the threaded hole 2e extends to the corresponding protruding post 2f, and one side of the protruding post 2f extends to the outer wall of the connecting ring 2d. The protruding post 2f extends the length of the threaded hole 2e, increases the positioning strength of the sealing plate 6, and also forms a reinforcing rib-like function to enhance the strength of the connecting ring 2d, thereby better supporting the limiting rolling bearing 5.

[0039] Furthermore, the bottom wall of the sealing plate 6 extends downward to form a guide ring 6a that matches the inner hole of the base ring 2c, and the guide ring 6a is inserted into the inner hole of the base ring 2c for guiding the installation of the sealing plate 6, which further facilitates the assembly and disassembly of the sealing plate 6.

[0040] To enhance the sealing strength between the sealing plate 6 and the base ring 2c, such as Figure 2 and Figure 3 As shown, this application also provides an annular groove coaxial with the base ring 2c on the top surface, with the bolt 7 positioned outside the annular groove. A rubber ring 8 is provided within the annular groove, with its two end faces contacting and sealing the bottom wall of the annular groove and the sealing plate 6, respectively. The rubber ring 8 is provided to enhance the sealing effect on the upper port of the central hole 2b. Preferably, the axial cross-section of the annular groove is L-shaped, and the inner wall of the rubber ring 8 contacts and seals the outer wall of the guide ring 6a, thereby increasing the sealing path formed between the sealing plate 6 and the base ring 2c, further strengthening the sealing effect on the upper port of the central hole 2b.

[0041] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that the sealing plate 6 is threaded into the upper port of the barrel 2.

[0042] 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 sewage pump motor, comprising a lower bearing housing (1), a casing (2) fixed to the lower bearing housing (1) by screws, and a rotor shaft (3) vertically disposed within the casing (2), wherein the lower end of the rotor shaft (3) passes through the lower bearing housing (1) and the two are rotatably coupled via a lower bearing (4), characterized in that, The inner wall of the barrel (2) at the upper port is integrally formed with an upper bearing seat (2a) coaxial with the rotor shaft (3). The upper bearing seat (2a) has a through-hole (2b) coaxial with the upper bearing seat (2a). The upper end of the rotor shaft (3) is inserted into the central hole (2b). A rolling bearing (5) is provided in the central hole (2b). The rolling bearing (5) includes an inner ring (5a) and an outer ring (5b). The outer ring (5b) and the inner ring (5a) are fixed to the inner wall of the central hole (2b) and the outer wall of the rotor shaft (3) respectively by interference fit. The outer diameter of the inner ring (5a) is smaller than the diameter of the central hole (2b). A sealing plate (6) is detachably fixed on the top of the barrel (2) to close the upper opening of the central hole (2b).

2. The waste pump motor of claim 1, wherein, The upper bearing housing (2a) includes a base ring (2c) horizontally formed on the inner wall of the barrel (2) and a connecting ring (2d) vertically formed on the bottom wall of the base ring (2c), and the inner holes of the base ring (2c) and the connecting ring (2d) together form the aforementioned central hole (2b); the rolling bearing (5) is disposed inside the connecting ring (2d), and the aforementioned sealing plate (6) is horizontally disposed inside the upper port of the barrel (2) and pressed on the base ring (2c).

3. The waste pump motor of claim 2, wherein, The inner diameter of the connecting ring (2d) is larger than the inner diameter of the base ring (2c) so that the center hole (2b) is stepped. The top wall of the outer ring (5b) presses against the bottom wall of the base ring (2c), and the outer wall of the rotor shaft (3) has a ring-shaped shoulder surface (3a) for the bottom wall of the inner ring (5a) to press against.

4. The sewage pump motor according to claim 2 or 3, characterized in that, The sealing plate (6) and the base ring (2c) are detachably fixed together.

5. The waste pump motor of claim 4, wherein, The sealing plate (6) is detachably fixed to the base ring (2c) by a ring of vertically arranged bolts (7), with the head of the bolts (7) facing upward.

6. The waste pump motor of claim 5, wherein, The top wall of the base ring (2c) is provided with a threaded hole (2e) that mates with the bolt (7). A ring of protrusions (2f) is vertically formed on the bottom wall of the base ring (2c). The number of threaded holes (2e), bolts (7) and protrusions (2f) are the same and their positions correspond one to one. The lower end of the threaded hole (2e) extends to the corresponding protrusion (2f).

7. The waste pump motor of claim 6, wherein, The protruding post (2f) extends to the outer wall of the connecting ring (2d) on one side.

8. The waste pump motor of claim 2, wherein, An annular groove coaxial with the base ring (2c) is provided on the top surface of the base ring (2c), and the bolt (7) is located outside the annular groove; a rubber ring (8) is provided inside the annular groove, and the two ends of the rubber ring (8) are in contact with the bottom wall of the annular groove and the sealing plate (6) respectively for sealing.

9. The waste pump motor of claim 8, wherein, The bottom wall of the sealing plate (6) extends downward to form a guide ring (6a) that matches the inner hole of the base ring (2c), and the guide ring (6a) is inserted into the inner hole of the base ring (2c).

10. The waste pump motor of claim 9, wherein, The axial cross section of the above-mentioned annular groove is L-shaped, and the inner wall of the rubber ring (8) is in contact with the outer wall of the guide ring (6a) for sealing.

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