A motor housing with a plastic-steel composite for submersible sewage pumps

Abstract

A motor casing with plastic-steel composite material for submersible sewage pump, comprising an inner steel casing and an outer plastic casing sleeved outside the inner steel casing. The inner steel casing comprises an inner steel casing body made of stainless steel material and a plurality of mounting holes uniformly arranged on the side walls of both ends of the inner steel casing body. The inner steel casing body is used to improve the overall strength of the motor casing. The outer plastic casing comprises an outer plastic casing body sleeved outside the inner steel casing body, a plurality of mounting protrusions uniformly arranged on the side walls of both ends of the outer plastic casing body, and two connecting ends respectively located at both ends of the outer casing body. The outer plastic casing body is made of plastic material. The mounting protrusions and the mounting holes are correspondingly arranged to relatively fix the inner steel casing body on the outer steel casing body. The outer plastic casing body is used to improve the corrosion resistance of the submersible sewage pump in liquid medium, thereby improving the service life of the submersible sewage pump.

Description

Technical Field

[0001] This utility model belongs to the field of motor housing parts manufacturing technology, and in particular, it is a motor housing with plastic steel composite material for submersible sewage pumps. Background Technology

[0002] Submersible sewage pumps are submersible sewage pumps, particularly suitable for conveying liquids containing hard solids, fibrous materials, and especially dirty, viscous, or slippery liquids. Compared to horizontal or vertical sewage pumps, submersible sewage pumps have advantages such as compact structure, small footprint, and convenient installation and maintenance, playing a vital role in various industries including municipal engineering, industry, hospitals, construction, catering, and water conservancy projects.

[0003] Existing submersible sewage pumps, especially their housings, are primarily made of a single material such as cast iron, stainless steel, or plastic. However, cast iron housings are prone to contaminating the medium, stainless steel housings are expensive, and plastic housings have low strength; none of them adequately meet the needs of actual production.

[0004] For example, in the utility model patent with publication number CN208123082U, the motor housing of the submersible sewage pump is formed by one-time casting of stainless steel. The manufacturing cost of the motor housing made entirely of stainless steel is high, which leads to high manufacturing costs for enterprises and is not conducive to improving the economic benefits of enterprises. Summary of the Invention

[0005] In view of this, the present invention provides a motor housing with a plastic-steel composite material for a submersible sewage pump to solve the above problems.

[0006] A motor housing for a submersible sewage pump, comprising a plastic-steel composite material, includes an inner steel shell and an outer plastic shell fitted over the inner steel shell. The inner steel shell includes a body made of stainless steel and a plurality of mounting holes evenly distributed on the sidewalls at both ends of the inner steel shell body. The outer plastic shell includes a body made of plastic fitted over the inner steel shell body and a plurality of mounting protrusions evenly distributed on the sidewalls at both ends of the outer plastic shell body and corresponding to the mounting holes.

[0007] Furthermore, the inner steel shell body is a hollow cylindrical shell with openings at both ends.

[0008] Furthermore, the mounting holes are located on the outer side wall of the inner steel shell body, and a plurality of the mounting holes located at the same end of the inner steel shell body are evenly spaced around the axis of the inner steel shell body.

[0009] Furthermore, the outer plastic shell also includes two connecting ends located at both ends of the outer plastic shell body, and the two connecting ends are respectively used to connect the motor end cover and the connecting seat.

[0010] Furthermore, the outer plastic shell is integrally formed by injection molding.

[0011] Furthermore, the outer plastic shell body is a hollow cylindrical shell with openings at both ends, and the radius of the inner diameter of the outer plastic shell body is approximately the same as the radius of the outer diameter of the inner steel shell body.

[0012] Furthermore, the mounting protrusions are located on the inner sidewalls at both ends of the outer plastic shell body.

[0013] Compared with existing technologies, the motor housing of the submersible sewage pump provided by this utility model, which uses stainless steel for the inner steel shell to ensure the strength of the motor housing, and uses a plastic outer shell to improve the overall corrosion resistance of the motor housing, thereby increasing the service life of the submersible sewage pump (not shown) while maintaining its overall economic efficiency. Furthermore, the tight fit between the mounting holes and the mounting protrusions limits the circumferential and axial movement of the inner steel shell on the outer plastic shell 20. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the motor housing with plastic-steel composite material for a submersible sewage pump provided by this utility model.

[0015] Figure 2 for Figure 1 An exploded structural diagram of a motor housing made of plastic-steel composite material used in submersible sewage pumps.

[0016] Figure 3 for Figure 1 A cross-sectional structural diagram of a motor housing made of plastic-steel composite material used for submersible sewage pumps.

[0017] Figure 4 for Figure 3 A cross-sectional exploded view of the motor housing made of plastic-steel composite material used in submersible sewage pumps. Detailed Implementation

[0018] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0019] like Figures 1 to 4The diagram shows a structural schematic of a motor housing with a plastic-steel composite material for a submersible sewage pump, provided by this utility model. The motor housing with a plastic-steel composite material for the submersible sewage pump includes an inner steel shell 10 and an outer plastic shell 20 fitted over the inner steel shell 10. The motor housing with a plastic-steel composite material for the submersible sewage pump also includes other functional modules, such as assembly components for installing the motor housing, etc., which should be known to those skilled in the art and will not be described in detail here.

[0020] like Figure 1 As shown, the inner steel shell 10 is used to assemble the motor stator (not shown). The inner steel shell 10 includes an inner steel shell body 11 and a plurality of mounting holes 12 evenly arranged on the side walls at both ends of the inner steel shell body 11. The inner steel shell 10 is made of stainless steel, which gives it high load-bearing strength and thus meets the structural requirements of the submersible sewage pump as a whole (not shown).

[0021] The inner steel shell body 11 is used to assemble the motor stator (not shown in the figure), which is a hollow cylindrical shell with openings at both ends. The inner steel shell body 11 is made of stainless steel, thereby giving it better load-bearing strength to support the motor stator (not shown in the figure).

[0022] The mounting holes 12 are used to mate with the mounting protrusions 22 described below to install and fix the outer plastic shell 20 onto the inner steel shell 10. The mounting holes 12 are located on the outer side walls at both ends of the inner steel shell body 11 and are evenly spaced. The number of mounting holes 12 located at the same end of the inner steel shell body 11 can be set according to actual needs. In this embodiment, each end of the inner steel shell body 11 is provided with four mounting holes 12, and the four mounting holes 12 are evenly spaced around the axis of the inner steel shell body 11.

[0023] like Figure 2 As shown, the outer plastic shell 20 is used to protect the inner steel shell 10. The outer plastic shell 20 includes an outer plastic shell body 21 sleeved on the inner steel shell body 11, a plurality of mounting protrusions 22 evenly arranged on the side walls at both ends of the outer plastic shell body 21, and two connecting ends 23 respectively located at both ends of the outer plastic shell body 21.

[0024] The outer plastic shell 20 is made of plastic and is integrally molded using an injection molding process. The outer plastic shell 20 is used to improve the corrosion resistance of the submersible sewage pump (not shown) in liquid media, thereby increasing the service life of the submersible sewage pump (not shown).

[0025] like Figure 3As shown, the outer plastic shell body 21 protects the inner steel shell body 11, and is a hollow cylindrical shell open at both ends. The outer plastic shell body 21 is made of plastic, giving it not only good corrosion resistance but also good elasticity, allowing it to fit tightly against the inner steel shell body 11. The radius of the inner diameter of the outer plastic shell body 21 is approximately the same as the radius of the outer diameter of the inner steel shell body 11.

[0026] like Figure 4 As shown, the mounting protrusions 22 are used to mount and fix the outer plastic shell body 21 onto the inner steel shell body 11. The mounting protrusions 22 are located on the inner sidewalls at both ends of the outer plastic shell body 21 and are evenly spaced, opposite to the mounting holes 12. The size and shape of the mounting protrusions 22 and the mounting holes 12 are compatible. The number of mounting protrusions 22 is determined by the number of mounting holes 12, and the number of mounting protrusions 22 is equal to the number of mounting holes 12. In this embodiment, each end of the outer plastic shell 21 is provided with four mounting protrusions 22, and these four mounting protrusions 22 are evenly spaced around the axis of the outer plastic shell body 21.

[0027] When the outer plastic shell body 21 is fitted onto the inner steel shell body 11, and the mounting protrusion 22 is inserted into the mounting hole 12, the inner steel shell body 11 is relatively fixed to the outer plastic shell body 21, thereby preventing the inner steel shell body 11 from rotating circumferentially or moving axially relative to the outer plastic shell body 21 during the movement of the motor stator (not shown). Furthermore, since the outer plastic shell body 21 is made of plastic, its inherent elasticity allows the inner wall of the outer plastic shell body 21 to tightly conform to the outer wall of the inner steel shell body 11, further limiting the relative movement of the inner steel shell body 11.

[0028] The two connecting ends 23 are respectively used to connect the motor end cover (not shown) and the connecting seat (not shown) to form a submersible sewage pump assembly (not shown) with the motor housing. When the submersible sewage pump assembly (not shown) is immersed in liquid medium, the outer plastic shell 20 is made of plastic material, which has good corrosion resistance. Therefore, the outer wall of the outer plastic shell 20 can resist the erosion of the submersible sewage pump assembly (not shown) by acid and alkali corrosive media, thereby improving the service life of the submersible sewage pump assembly.

[0029] The motor end cover (not shown in the figure) refers to a rear cover installed behind the motor housing to improve the overall sealing of the motor. It should be an existing technology and will not be described in detail here.

[0030] The connecting seat (not shown in the figure) is a component used to connect the equipment to form a submersible sewage pump together with the motor housing. This should be well known to those skilled in the art, and will not be described in detail here.

[0031] Compared with the prior art, the motor housing of the submersible sewage pump provided by this utility model, which uses a stainless steel inner steel shell 10 to ensure the strength of the motor housing, and an outer plastic shell 20 made of plastic to improve the overall corrosion resistance of the motor housing, thereby improving the overall service life of the submersible sewage pump (not shown) while maintaining its overall economic efficiency. Furthermore, the tight fit between the mounting hole 12 and the mounting protrusion 22 limits the circumferential movement and axial movement of the inner steel shell 10 on the outer plastic shell 20.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A motor housing made of plastic-steel composite material for a submersible sewage pump, characterized in that: The motor housing of the submersible sewage pump with plastic-steel composite material includes an inner steel shell and an outer plastic shell fitted over the inner steel shell. The inner steel shell includes an inner steel shell body made of stainless steel and a plurality of mounting holes evenly arranged on the side walls at both ends of the inner steel shell body. The outer plastic shell includes an outer plastic shell body fitted over the inner steel shell body and made of plastic, and a plurality of mounting protrusions evenly arranged on the side walls at both ends of the outer plastic shell body and corresponding to the mounting holes. The mounting holes and the mounting protrusions are adapted to each other in size and shape.

2. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 1, characterized in that: The inner steel shell body is a hollow cylindrical shell with openings at both ends.

3. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 2, characterized in that: The mounting holes are located on the outer side wall of the inner steel shell body, and a plurality of the mounting holes located at the same end of the inner steel shell body are evenly spaced around the axis of the inner steel shell body.

4. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 1, characterized in that: The outer plastic shell also includes two connecting ends located at both ends of the outer plastic shell body, and the two connecting ends are used to connect the motor end cover and the connecting seat, respectively.

5. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 1, characterized in that: The outer plastic shell is integrally formed by injection molding.

6. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 2, characterized in that: The outer plastic shell body is a hollow cylindrical shell with openings at both ends, and the radius of the inner diameter of the outer plastic shell body is approximately the same as the radius of the outer diameter of the inner steel shell body.

7. The motor housing with plastic-steel composite material for a submersible sewage pump as described in claim 6, characterized in that: The mounting protrusions are located on the inner sidewalls at both ends of the outer plastic shell body.

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