Motor shell for shield pump and shield pump

Abstract

The utility model discloses a motor shell for a shield pump and the shield pump, and belongs to the field of shield pumps. According to the motor shell, the wall surface of the top end is provided with the recessed cavity which is recessed towards the direction of the inner cavity of the motor shell, the shaft end installation cavity is formed in the area, corresponding to the recessed cavity, of the middle of the inner cavity of the motor shell, and the shaft end installation cavity is used for insertion and matched installation of the fixed end of the motor shaft. And the top surface of the shaft end mounting cavity is lower than the wall surface of the top end of the motor shell. According to the utility model, the structural rigidity of the motor shaft can be effectively increased, and the operation stability is improved, thereby reducing vibration and noise.

Description

Technical Field

[0001] This utility model relates to the field of shielded pump technology, and more specifically, to a motor housing for a shielded pump and a shielded pump. Background Technology

[0002] Currently, canned motor pumps are widely used in chemical, pharmaceutical, and nuclear industries due to their significant advantages such as compact structure and good sealing performance. However, in actual use, the operating performance of canned motor pumps is highly dependent on the installation quality and operational stability of the motor shaft: as the core component for power transmission, the installation strength and positional stability of the motor shaft directly affect the overall operating efficiency and reliability of the pump.

[0003] Due to inherent defects in the current motor shaft support structure, the motor shaft experiences significant axial movement during operation. This movement not only reduces the operational stability of the equipment but also exacerbates mechanical vibration, leading to increased noise and accelerated bearing wear. Particularly under prolonged continuous operation, the axial movement of the motor shaft intensifies, severely impacting the equipment's operating efficiency and lifespan, and potentially affecting its reliability in high-precision applications. Furthermore, excessive operating noise not only causes environmental pollution but may also mask early-stage fault characteristics, increasing the difficulty of equipment maintenance. Therefore, effectively suppressing the axial movement of the motor shaft, improving operational stability, and reducing noise levels have become crucial factors in enhancing the overall performance of canned motor pumps. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model

[0005] In view of the problems of unstable operation and high noise in existing canned motor pumps, this utility model aims to provide a motor housing and a canned motor pump for canned motor pumps. By optimizing the structure of the electrode housing, the installation stability of the motor shaft is improved and the noise level is reduced.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] This utility model discloses a motor housing for a shielded pump. The top of the motor housing is used for installation with a controller housing, and the inner cavity of the motor housing is used for installing motor components. A recessed cavity is provided on the top wall of the motor housing, which is recessed downward toward the inner cavity of the motor housing. A shaft end mounting cavity is formed in the middle of the inner cavity of the motor housing, corresponding to the position of the recessed cavity. The shaft end mounting cavity is used for inserting and installing the fixed end of the motor shaft, and the top surface of the shaft end mounting cavity is lower than the height of the top wall of the motor housing.

[0009] Furthermore, the ratio between the axial recess depth H2 of the recessed cavity and the axial length H1 of the motor housing is 0.15-0.45.

[0010] Furthermore, the bottom of the recessed cavity is provided with a boss protruding outward toward the inner cavity of the motor housing, and the inner wall of the boss forms a shaft end mounting cavity.

[0011] Furthermore, a limiting part protruding axially is provided around the side of the bottom wall of the recessed cavity facing the inner cavity of the motor housing, and the limiting part is coaxially surrounding the outer periphery of the shaft end mounting cavity.

[0012] Furthermore, the opening area of ​​the recessed cavity is smaller than the opening area of ​​the inner cavity of the motor housing, and the top of the recessed cavity is connected to the top edge of the motor housing through an outer end face, which is a flat part extending radially along the motor housing.

[0013] Furthermore, the recessed cavity is a conical cavity with a gradually decreasing opening area towards the inner cavity of the motor housing, and the distance between the circumferential wall of the recessed cavity and the inner wall of the motor housing gradually increases downward.

[0014] Furthermore, the top of the motor housing is also provided with a cable outlet adapter slot and a mounting post. The cable outlet adapter slot is connected to the inner cavity of the motor housing and is used for cable outlet connection with the controller box. The mounting post is used for fixed installation. Both the cable outlet adapter slot and the mounting post are distributed on the outer end face.

[0015] This utility model also provides a shielded pump, including the motor housing as described above. A motor shaft is installed in the inner cavity of the motor housing. The fixed end of the motor shaft is embedded in the shaft end mounting cavity for installation. The height of the fixed end of the motor shaft is lower than the height of the top wall of the motor housing.

[0016] Furthermore, a coaxially distributed shield is provided around the outer periphery of the motor shaft, which isolates the rotor assembly and stator assembly installed on the outside of the motor shaft; the top of the shield has a protrusion that fits into the shaft end mounting cavity, and the end of the shield is provided with a buffer pad around the outside of the protrusion, which is pressed between the end face of the shield and the bottom wall of the recessed cavity.

[0017] Furthermore, it also includes a controller housing, which is mounted on top of the motor housing.

[0018] Furthermore, it also includes a heat insulation plate, which is installed between the controller housing and the motor housing. The heat insulation plate is large enough to cover the opening of the recessed cavity and has a height gap with the recessed cavity.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0021] (1) The shielded pump of this utility model has a recessed cavity on the top wall of the motor housing, which can not only improve the structural strength of the motor housing, but also effectively shorten the overall length of the motor shaft installed inside, increase its structural rigidity, improve the running stability, thereby reducing vibration and noise.

[0022] (2) The shielded pump of this utility model utilizes the design of the recessed cavity, which greatly reduces the contact area between the top of the motor housing and the controller box, reduces heat transfer, and can utilize the ventilation and heat dissipation channel formed in the recessed cavity to accelerate the heat dissipation effect, effectively improve the heat dissipation effect, and reduce the adverse effects on the controller box.

[0023] (3) The shielded pump of this utility model has a conical cavity in the recessed cavity. While ensuring the depth space, it can provide sufficient installation space between the pump and the inner wall of the motor housing, so as to realize the installation of the stator assembly inside the motor housing, and the overall structural strength of the motor housing is also guaranteed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the motor housing structure in the embodiment;

[0025] Figure 2 This is a cross-sectional view of the motor housing in the embodiment;

[0026] Figure 3 This is a cross-sectional view of the assembly state of the motor housing and the controller housing in the embodiment.

[0027] Explanation of the labels in the diagram:

[0028] 100. Motor housing; 101. Outer end face; 102. Recessed cavity; 103. Boss; 104. Cable outlet groove; 105. Mounting post; 106. Heat dissipation fins; 107. Sloping wall; 108. Inner end face; 109. Limiting part; 120. Motor shaft; 130. Shielding cover; 140. Bearing; 150. Buffer pad;

[0029] 200, controller housing; 300, heat insulation board. Detailed Implementation

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0031] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. The terms "first," "second," "third," and "fourth" should also be interpreted broadly, merely distinguishing feature names and not indicating a specific sequential relationship. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The present invention will be further described below with reference to the embodiments.

[0034] Example

[0035] Combination Figures 1 to 3 As shown in the figure, this embodiment provides a motor housing for a canned motor pump. The top end of the motor housing 100 is used for mounting with a controller housing 200, and the inner cavity of the motor housing 100 is used for mounting motor components, such as a motor shaft 120, a rotor assembly (not shown in the figure), and a stator assembly (not shown in the figure). In this embodiment, "top end" refers only to the end of the motor housing 100 that is used for mounting with the controller housing 200 relative to the position in the figure. Specifically, the top wall of the motor housing 100 is provided with a recessed cavity 102 that is recessed downward toward the inner cavity of the motor housing 100. A shaft end mounting cavity 110 is formed in the middle of the inner cavity of the motor housing 100, corresponding to the position of the recessed cavity 102. The shaft end mounting cavity 110 is used for inserting and mounting the fixed end of the motor shaft 120, and the top surface height of the shaft end mounting cavity 110 is lower than the top wall height of the motor housing 100.

[0036] In practice, it is preferable that the shaft end mounting cavity 110 and the recessed cavity 102 are coaxially distributed with the inner cavity of the motor housing 100, and the opening size of the three cavities gradually increases. That is, the recessed cavity 102 is recessed downward along the middle area of ​​the top of the motor housing 100, and the shaft end mounting cavity 110 is located in the middle area of ​​the recessed cavity 102, so that the motor shaft 120 is centrally distributed in the inner cavity of the motor housing 100, and the shape is simple and beautiful.

[0037] In practice, the structure of the shaft end mounting cavity 110 has multiple implementations, as shown in the reference. Figure 1 and Figure 2 As shown, the bottom of the recessed cavity 102 has a boss 103 protruding outward toward the inner cavity of the motor housing 100, and the inner walls of the boss 103 form a shaft end mounting cavity 110. Figure 2 As shown, the recessed cavity 102 has a boss 103 at its center, which protrudes towards the recessed cavity 102, forming an assembly area for the fixed end of the motor shaft 120 at the center of the inner cavity of the motor housing 100. The motor shaft 120 can be inserted inward, facilitating the positioning and installation of the motor shaft 120 and helping to suppress the movement of the motor shaft 120. Alternatively, a limiting ring wall protruding towards the inner cavity of the motor housing 100 can be provided around the bottom wall of the recessed cavity 102, forming a shaft end mounting cavity 110. Alternatively, the shaft end mounting cavity 110 can be formed in the thickness region at the bottom of the recessed cavity 102, etc.

[0038] In this embodiment, by setting a downwardly recessed cavity 102, the ratio between the axial recess depth H2 of the recessed cavity 102 and the axial length H1 of the motor housing 100 is preferably controlled to be 0.15-0.45, such as 0.15, 0.2, 0.25, 0.3, 0.45, etc. in practice. This effectively controls the depth range of the recessed cavity 102, which not only improves the structural strength of the motor housing 100, but also significantly reduces the height of the middle part of the inner cavity of the motor housing 100, that is, significantly reduces the installation height corresponding to the motor shaft 120. This allows for a reduction in the length of the motor shaft 120 and meets the installation space requirements of the stator and rotor assemblies inside the housing. In traditional designs, the motor housing 100 is generally arranged close to a plane, and the extension length of the motor shaft 120 is basically the same as the length of the motor housing 100. A longer motor shaft 120 not only reduces rigidity but also makes it more prone to operational instability and increased equipment noise. In this embodiment, by using a recessed cavity 102, the length of the motor shaft 120 can be effectively shortened, its structural rigidity increased, and its operational stability improved, thereby reducing vibration and noise.

[0039] Secondly, in practical applications, the motor housing 100 needs to be installed in conjunction with the controller housing 200. In traditional designs, the motor housing 100 is directly installed in contact with the plane of the controller housing 200. The large amount of heat inside the motor can easily be transferred into the controller housing 200, resulting in poor heat dissipation and potentially affecting the lifespan of the controller housing 200. However, this embodiment utilizes the recessed cavity 102 design, which significantly reduces the contact area between the top of the motor housing 100 and the controller housing 200, and increases the spatial distance between the recessed cavity 102 and the controller housing 200, effectively reducing heat transfer. Furthermore, the recessed cavity 102 forms a ventilation and heat dissipation channel, accelerating heat dissipation and effectively improving the cooling effect while minimizing adverse effects on the controller housing 200. To further improve heat dissipation, multiple sets of spaced-apart heat dissipation fins 106 can also be arranged around the outer wall of the motor housing 100, with heat dissipation channels formed between adjacent fins 106 to accelerate heat dissipation.

[0040] This embodiment employs a boss 103 design, which not only forms a shaft end mounting cavity 110, but also enhances the structural strength of the boss 103 and the recessed cavity 102, ensuring the stability of the motor shaft 120 installation. Furthermore, the boss 103 extends inside the recessed cavity 102, without occupying additional space within the cavity of the recessed cavity 102, and can effectively control the height of the shaft end mounting cavity 110, ensuring sufficient installation space for the motor shaft 120 and guaranteeing installation stability.

[0041] Preferably, a limiting portion 109 protruding axially is provided around the bottom wall of the recessed cavity 102 on the side facing the inner cavity of the motor housing 100, and the limiting portion 109 coaxially surrounds the outer periphery of the shaft end mounting cavity 110. More specifically, in conjunction with Figure 2 As shown, the side of the bottom wall of the recessed cavity 102 facing the inner cavity of the motor housing 100 is the inner end face 108. The shaft end mounting cavity 110 is formed by protruding upward in the middle of the inner end face 108. The limiting part 109 surrounds the edge of the inner end face 108 and can limit the internal area of ​​the inner end face 108.

[0042] Preferably, in practice, the opening area of ​​the recessed cavity 102 is smaller than the opening area of ​​the inner cavity of the motor housing 100, and the top of the recessed cavity 102 is connected to the top edge of the motor housing 100 through an outer end face 101, which is a flat portion extending radially along the motor housing 100. When installed with the controller housing 200, the outer end face 101 is used as the installation mating area, which not only reduces the installation contact area, but also helps to ensure installation stability by using a flat installation.

[0043] To ensure the effective installation of the motor assembly within the motor housing 100, the recessed cavity 102 is further designed as a tapered cavity with a gradually decreasing opening area towards the inner cavity of the motor housing 100. This results in the distance between the circumferential wall of the recessed cavity 102 and the inner wall of the motor housing 100 gradually increasing downwards. Specifically, the axial annular wall of the recessed cavity 102 is a sloping wall 107 that gradually moves downwards away from the inner wall of the motor housing 100. This tapered cavity design ensures sufficient depth space for the recessed cavity 102 while providing ample installation space between the sloping wall 107 and the inner wall of the motor housing 100, thereby enabling the installation of the stator assembly inside the motor housing 100. Furthermore, the overall structural strength of the motor housing 100 is also guaranteed.

[0044] Furthermore, to facilitate installation with the controller housing 200, the top of the motor housing 100 is provided with a cable transfer groove 104 and a mounting post 105. The cable transfer groove 104 is a through groove that connects to the inner cavity of the motor housing 100 and is used for cable transfer with the controller housing 200 to achieve circuit connection. The mounting post 105 is used for fixed installation and may have a threaded hole inside. Both the cable transfer groove 104 and the mounting post 105 are distributed on the outer end face 101, that is, in the planar area, which facilitates stable installation.

[0045] This embodiment also provides a canned motor pump, including the motor housing 100 as described above. A motor shaft 120 is installed in the inner cavity of the motor housing 100. The fixed end of the motor shaft 120 is embedded in the shaft end mounting cavity 110 and fixedly installed by a bearing 140. The height of the fixed end of the motor shaft 120 is lower than the height of the top wall of the motor housing 100. This effectively shortens the length of the motor shaft 120, improves its rigidity, reduces operating noise, and ensures stable operation.

[0046] More specifically, in combination Figure 3As shown, a coaxially distributed shield 130 is also provided around the outer periphery of the motor shaft 120. The rotor assembly is installed in the area enclosed between the motor shaft 120 and the shield 130, and the stator assembly is installed in the area enclosed between the shield 130 and the motor housing 100. The shield 130 seals and isolates the rotor assembly and the stator assembly. Corresponding to the boss portion 103, the top of the shield 130 has a protrusion that fits into the shaft end mounting cavity 110. The bearing 140 is installed between the fixed end of the motor shaft 120 and the protrusion of the shield 130 to ensure the flexible rotation of the motor shaft 120. Furthermore, a buffer pad 150 is provided around the outer side of the protrusion at the end of the shield 130. The buffer pad 150 is pressed between the end face of the shield 130 and the bottom wall of the recessed cavity 102, that is, the buffer pad 150 is pressed between the top face of the shield 130 and the inner end face 108. This can effectively buffer vibration, ensure smooth operation, and reduce noise. The buffer pad 150 is located in the internal space enclosed by the limiting part 109. The limiting part 109 can effectively limit the installation of the buffer pad 150.

[0047] In practice, the canned motor pump also includes a controller housing 200. The top of the motor housing 100 is detachably connected to the controller housing 200. Specifically, it can be bolted on by the mounting post 105 on the outer end face 101, and the circuit is connected using the outgoing wire adapter groove 104. This not only ensures stable installation and significantly reduces the contact area, thus reducing heat transfer, but the outward protrusion of the mounting post 105 also creates a certain flow channel gap between the controller housing 200 and the outer end face 101. Combined with the internal recessed cavity 102, this forms a sufficient heat dissipation channel to accelerate heat dissipation.

[0048] To further improve heat dissipation, a preferred design is to install a heat insulation plate 300 between the bottom wall of the controller housing 200 and the top surface of the motor housing 100. The heat insulation plate 300 is large enough to cover the opening of the recessed cavity 102 and has a height gap with the recessed cavity 102. (Specifically combined...) Figure 3 As shown, the bottom wall of the controller housing 200 and the motor housing 100 are generally made of metal, while the heat insulation plate 300 is made of plastic material and can be integrally injection molded. This effectively blocks the heat transfer between the controller housing 200 and the motor housing 100, and the contact area between the heat insulation plate 300 and the motor housing 100 is also greatly reduced, further reducing the heat transfer from the motor to the controller housing 200. At this time, the heat insulation plate 300 and the motor housing 100 are connected by bolts through the mounting post 105, and a heat dissipation channel is also formed to accelerate heat dissipation. The heat insulation plate 300 and the controller housing 200 can also be connected by bolts. The outgoing wire adapter module passes through the heat insulation plate 300 and enters the outgoing wire adapter groove 104 to be electrically connected to the stator assembly.

[0049] The shielded pump in this embodiment, through structural optimization of the motor housing 100, not only improves the strength and installation stability of the motor shaft 120, which is beneficial for vibration reduction and noise reduction, but also enhances heat dissipation performance, ensuring sufficient heat dissipation. Moreover, it has a simple structure and concise shape, and helps to ensure the overall strength of the motor housing 100, which has outstanding practical significance.

[0050] The scope of protection of this utility model is defined only by the claims. Thanks to the teachings of this utility model, those skilled in the art will readily recognize that alternative structures to the disclosed structure can be used as feasible alternative implementations, and that the disclosed implementations can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A motor housing for a canned motor pump, wherein the top end of the motor housing (100) is used for mounting with a controller housing (200), and the inner cavity of the motor housing (100) is used for mounting a motor assembly; characterized in that: The top wall of the motor housing (100) is provided with a recessed cavity (102) that is recessed downward toward the inner cavity of the motor housing (100). A shaft end mounting cavity (110) is formed in the middle of the inner cavity of the motor housing (100) in a region corresponding to the position of the recessed cavity (102). The shaft end mounting cavity (110) is used for inserting and fitting the fixed end of the motor shaft (120) for installation. The top surface height of the shaft end mounting cavity (110) is lower than the top wall height of the motor housing (100).

2. The motor housing for a canned pump according to claim 1, characterized in that: The ratio between the axial recess depth H2 of the recessed cavity (102) and the axial length H1 of the motor housing (100) is 0.15-0.

45.

3. The motor housing for a canned pump according to claim 1, characterized in that: The bottom of the recessed cavity (102) is provided with a boss (103) protruding outward toward the inner cavity of the motor housing (100), and the inner walls of the boss (103) form a shaft end mounting cavity (110); or / and, the bottom wall of the recessed cavity (102) facing the inner cavity of the motor housing (100) is provided with a limiting part (109) protruding axially, and the limiting part (109) is coaxially surrounding the outer periphery of the shaft end mounting cavity (110).

4. The motor housing for a canned pump according to claim 1, characterized in that: The opening area of ​​the recessed cavity (102) is smaller than the opening area of ​​the inner cavity of the motor housing (100), and the top of the recessed cavity (102) is connected to the top edge of the motor housing (100) through an outer end face (101), which is a planar part extending radially along the motor housing (100).

5. The motor housing for a canned pump according to claim 1, characterized in that: The recessed cavity (102) is a conical cavity with a gradually decreasing opening area towards the inner cavity of the motor housing (100), and the distance between the circumferential wall of the recessed cavity (102) and the inner cavity wall of the motor housing (100) gradually increases downward.

6. The motor housing for a canned pump according to claim 4, characterized in that: The top of the motor housing (100) is also provided with a wire connection slot (104) and a mounting post (105). The wire connection slot (104) is connected to the inner cavity of the motor housing (100) for wire connection with the controller box (200). The mounting post (105) is used for fixed installation. The wire connection slot (104) and the mounting post (105) are both distributed on the outer end face (101).

7. A canned motor pump, characterized in that: The motor housing (100) as described in any one of claims 1-6 is included. A motor shaft (120) is installed in the inner cavity of the motor housing (100). The fixed end of the motor shaft (120) is embedded in the shaft end mounting cavity (110) for installation. The height of the fixed end of the motor shaft (120) is lower than the height of the top wall surface of the motor housing (100).

8. A canned pump according to claim 7, characterized in that: The outer periphery of the motor shaft (120) is also surrounded by a coaxially distributed shield (130), which isolates the rotor assembly and stator assembly installed on the outside of the motor shaft (120). The top of the shield (130) has a protrusion that fits into the shaft end mounting cavity (110), and the end of the shield (130) is surrounded by a buffer pad (150) on the outside of the protrusion. The buffer pad (150) is pressed between the end face of the shield (130) and the bottom wall of the recessed cavity (102).

9. A canned pump according to claim 7, characterized in that: It also includes a controller housing (200), which is mounted on top of the motor housing (100).

10. A canned pump according to claim 9, characterized in that: It also includes a heat insulation plate (300), which is installed between the bottom wall of the controller housing (200) and the top wall of the motor housing (100). The heat insulation plate (300) is large enough to cover the opening of the recessed cavity (102) and has a height gap with the recessed cavity (102).

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