A pump housing of a canned pump and the canned pump

Abstract

The present invention relates to a pump casing of a shielded pump and the shielded pump, the pump casing includes an isolation sleeve and a pump casing sleeve, the pump casing sleeve includes a sleeve body and a connecting portion connected to the sleeve body, the connecting portion includes a pin assembly, the pin assembly includes a pin seat and a pin inserted into the pin seat, the pin seat includes an inner pin seat and an outer pin seat, the sleeve body includes an inner sleeve and an outer sleeve fixed to each other, the inner sleeve is located in the inner cavity of the outer sleeve and is a coaxial cylinder with the outer sleeve, and the first sealing groove is an annular groove. The pump casing of the shielded pump of the present invention and the shielded pump are generally regular cylindrical in shape and the portion where the bottom is fixed to the bottom cover is regular annular, suitable for installing regular-shaped sealing rings such as O-rings that are easy to produce and obtain, and can greatly improve the production efficiency of the shielded pump.

Description

Technical Field

[0001] The invention belongs to the technical field of pumps, and in particular relates to a pump casing of a shielded pump and the shielded pump. Background Art

[0002] A canned motor pump is an absolutely leak-free pump that integrates the pump housing and the drive motor. At present, a miniature canned motor pump is commonly used in the coolant circulation system of electric vehicles. For a miniature canned motor pump whose pump housing is formed by integrating the pump housing sleeve and the isolation sleeve, such as Figure 1 As shown, the stator needs to be installed from the bottom of the pump casing sleeve. The lower end of the pump casing sleeve is open and fixed to the bottom cover of the shielded pump. Since the bottom cover is generally equipped with a circuit board, a power pin will be set at the lower end of the pump casing sleeve, one end of which is connected to the circuit board and the other end is used to connect to the external power supply. The pin seat (including the inner pin seat 2' and the outer pin seat 3') used to accommodate the power pin will occupy a certain space at the bottom of the pump casing sleeve, making the bottom of the pump casing sleeve as a whole irregular and the sealing groove 1' at the bottom for accommodating the sealing ring needs to be made into an irregular shape. This results in the bottom cover also needing to be made into an irregular shape, causing inconvenience in production, and the sealing ring used to seal and fix the bottom of the pump casing sleeve and the bottom cover needs to be a special-shaped ring. During the production process, the inconvenience of installing the special-shaped ring may cause failure problems, resulting in unreliable sealing; in addition, the installation of the special-shaped ring is relatively time-consuming, resulting in low production efficiency. Summary of the invention

[0003] Based on this, the purpose of the present invention is to provide a pump casing of a shielded pump, which solves the problem that the bottom of the original pump casing sleeve is irregularly shaped. The bottom and the part where the bottom cover is fixed are regular ring-shaped, which is suitable for installing rubber rings of regular shapes that are easy to produce and obtain, such as O-rings, which can greatly improve the production efficiency of the shielded pump.

[0004] A pump casing of a shielded pump, comprising an isolation sleeve and a pump casing sleeve, the top of the pump casing sleeve is fixed to the isolation sleeve, and the bottom end thereof is open, the pump casing sleeve comprises a sleeve body and a connecting portion connected to the sleeve body, the connecting portion is located at the bottom end of the pump casing sleeve, comprises a connecting portion body and a pin assembly, the connecting portion body is provided with a first sealing groove, the pin assembly comprises a pin seat and a pin inserted into the pin seat, the pin seat comprises an inner pin seat located on the inner side of the first sealing groove and an outer pin seat located on the outer side of the first sealing groove, characterized in that: the sleeve body comprises an inner sleeve and an outer sleeve fixed to each other, the inner sleeve is located in the inner cavity of the outer sleeve and is a coaxial cylinder with the outer sleeve, and the first sealing groove is an annular groove.

[0005] The pump casing of the shielded pump of the present invention, on the one hand, through the double-layer design of the pump casing sleeve, compared with the conventional pump casing, makes it possible for the inner sleeve to contact the outer side of the stator, and there is a certain space between the inner sleeve and the outer sleeve directly below, which makes it possible for the inner needle seat at the bottom of the pump casing sleeve to be arranged on the inner side of the outer sleeve. Therefore, there is no need to perform special-shaped design on the bottom (i.e., the connecting portion) of the pump casing sleeve to accommodate the inner needle seat, so that the first sealing groove arranged on the connecting portion for connecting with the bottom cover of the shielded pump is annular, and the annular groove specifically refers to an annular groove of regular shape, including a circular ring, an elliptical ring and a square ring, etc., and the sealing ring used to seal and fix the pump casing sleeve and the bottom cover can be a sealing ring of regular shape, such as an O-ring, an elliptical ring or a square ring, etc., which is conducive to convenient production and improved production efficiency; on the other hand, the pump casing sleeve is designed as a double-layer structure of an inner sleeve and an outer sleeve, rather than integrating the two into one sleeve. For the pump casing sleeve manufactured by injection molding, it can effectively avoid defects such as injection shrinkage holes caused by thick wall thickness.

[0006] Furthermore, the pump housing sleeve also includes a sleeve connecting portion for connecting the inner sleeve and the outer sleeve, and the sleeve connecting portion, the inner sleeve and the outer sleeve together enclose a second annular groove, and the second annular groove opens upward or downward. The second annular groove can reduce weight and the injection molding defect rate on the one hand, and can also play a vibration reduction role when the shielded pump is running, and reduce noise at the same time; the opening of the second annular groove can be either upward or downward. If the opening is upward, it is convenient to inject coolant into the second annular groove for cooling the stator.

[0007] Furthermore, the pump casing sleeve further comprises a first reinforcing rib disposed in the second annular groove, wherein the first reinforcing rib connects the inner sleeve and the outer sleeve. The strength of the sleeve body can be improved by disposing the first reinforcing rib, which is preferably evenly distributed along the circumferential direction.

[0008] Furthermore, the inner pin seat is connected to and protrudes from the inner wall of the connecting part body; the pump housing sleeve also includes a first protrusion, which is fixed to the inner wall of the outer sleeve and connects the sleeve connecting part and the inner pin seat, and the minimum distance from the first protrusion to the axis is not greater than the minimum distance from the inner pin seat to the axis, and is not less than the inner diameter of the inner sleeve. For pump housings manufactured by injection molding, a demoulding method from top to bottom is generally adopted. Since the inner pin seat is located at the bottom of the pump housing sleeve and is protruding, if the first protrusion is not provided, demoulding will be impossible.

[0009] Furthermore, the outer wall of the pump casing sleeve is provided with a third groove, and the first protrusion and the third groove are respectively located at corresponding positions of the pump casing sleeve. Due to the setting of the first protrusion, the total thickness of the outer sleeve and the first protrusion is thicker. For the injection-molded pump casing, it is more likely to produce defects such as injection shrinkage holes here compared with other positions of the outer sleeve. Therefore, by setting the third groove, the injection thickness is uniformed, and the injection defects can be effectively eliminated. The third groove can be opened only on the outer sleeve; or it can be more concave inward from the outer wall surface of the outer sleeve. For example, the third groove can be concave from the outer side surface of the outer sleeve and penetrate the outer sleeve wall, and then extend to the first protrusion and concave. Preferably, the pump casing sleeve also includes a second reinforcing rib, which is protruding and fixed to the bottom surface of the third groove and connects the two opposite walls of the third groove. By setting the second reinforcing rib, the strength of the third groove is effectively increased.

[0010] Furthermore, the pump housing sleeve also includes a third reinforcing rib, the third reinforcing rib protrudes and is fixed to the bottom surface of the third groove and connects the other two wall surfaces opposite to the third groove, and the outer side surface of the second reinforcing rib is at a distance from the axis center greater than the outer diameter of the outer sleeve. The strength of the third groove can be further strengthened by the provision of the third reinforcing rib. In addition, since the shielded pump needs to be fixed to the mounting bracket (generally made of rubber) on the automobile when it is applied to the automobile, the outer side surface of the second reinforcing rib is at a distance from the axis center greater than the outer diameter of the outer sleeve, that is, the second reinforcing rib rubber protrudes from the outer sleeve, and a groove is correspondingly provided on the mounting bracket, so that the second reinforcing rib can be stuck in the groove, which is conducive to preventing the shielded pump from slipping in the circumferential direction relative to the mounting bracket.

[0011] As an implementation method, the isolation sleeve and the pump housing sleeve are integrally formed, and the minimum distance from the inner needle seat to the axis is smaller than the inner diameter of the outer sleeve, but not smaller than the inner diameter of the inner sleeve. The pump housing is integrally formed, which is convenient for manufacturing. In addition, since the minimum distance from the inner needle seat to the axis is smaller than the inner diameter of the outer sleeve, but not smaller than the inner diameter of the inner sleeve, the inner needle seat fully utilizes the radial space between the inner sleeve and the outer sleeve, so that the first sealing groove between the inner needle seat and the outer needle seat can be set into a ring shape without expanding its diameter. In addition, the above specific structural setting can also ensure that the stator can smoothly enter from the bottom of the pump housing sleeve to between the inner sleeve and the isolation sleeve when the shielded pump is assembled.

[0012] Furthermore, the connecting part body is annular, and the first sealing groove is located on the outside of the outer sleeve. The first sealing groove can be set below the outer sleeve or on the outside of the outer sleeve according to the thickness of the outer sleeve; when it is set on the outside of the outer sleeve, the pump housing sleeve has a certain radial expansion space outward, and the inner pin seat can be ensured to be located inside the first sealing groove while the wall thickness of the outer sleeve is reduced.

[0013] The present invention also provides a shielded pump, characterized in that it includes a pump cover, a bottom cover, a stator and the pump housing, the pump cover is fixed to one end of the pump housing, the bottom cover is fixed to the open end of the pump housing, and the stator is arranged between the isolation sleeve and the inner sleeve.

[0014] The shielded pump of the present invention has a specific structural setting of the pump casing, so that the connecting surface between the bottom cover and the pump casing is annular, and the production of the pump casing and the bottom cover is more convenient; and the sealing and fixing between them can use a regularly shaped sealing ring, such as an O-ring. The regularly shaped sealing ring is not only more conventional and easy to obtain, but also convenient for workers to install and operate, thereby greatly improving the production efficiency of the shielded pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a bottom view of a pump housing of the prior art;

[0016] Figure 2 is a cross-sectional view of a pump housing according to an embodiment of the present invention;

[0017] Figure 3 yes Figure 2 A top view of

[0018] Figure 4 yes Figure 2 Bottom view of

[0019] Figure 5 is a bottom view of a pump housing according to another embodiment of the present invention;

[0020] Figure 6 yes Figure 5 AA section view;

[0021] Figure 7 yes Figure 5 BB cross-section diagram;

[0022] Figure 8 It is a schematic diagram of the three-dimensional structure of a pump housing according to a preferred embodiment of Example 1 of the present invention;

[0023] Fig. 9 yes Figure 8 A schematic diagram of the three-dimensional structure of the pump housing from another perspective;

[0024] Fig.10 yes Figure 8 Schematic diagram of the pump housing and the mounting bracket on the car;

[0025] Fig.11 yes Fig.10 A cross-sectional schematic diagram of

[0026] Fig.12is a cross-sectional schematic diagram of the cooperation between the pump housing and the mounting bracket on the automobile in one implementation manner of Example 1 of the present invention;

[0027] Fig.13 is a cross-sectional view of a canned motor pump according to an implementation method in Example 2 of the present invention;

[0028] Fig.14 is a cross-sectional view of a canned motor pump according to another embodiment of the present invention;

[0029] In the figure:

[0030] 1′ sealing groove, 2′-inner needle seat, 3′-outer needle seat, 1-isolating sleeve, 2-pump casing sleeve, 21-sleeve body, 211-inner sleeve, 212-outer sleeve, 213-sleeve connecting part, 214-second annular groove, 215-first reinforcing rib, 22-connecting part, 221-connecting part body, 2211-first sealing groove, 222-inner needle seat, 223-outer needle seat, 224-pin, 23-first bump, 24-third groove, 25-second reinforcing rib, 26-third reinforcing rib, 231-first surface, 3-pump cover, 4-bottom cover, 5-O-ring, 6-stator, 7-mounting bracket, 71-groove. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] Example 1

[0034] like Figures 2 to 11As shown, the pump casing of the shielded pump of this embodiment includes an isolation sleeve 1 and a pump casing sleeve 2. The top of the pump casing sleeve 2 is fixed to the isolation sleeve 1, and its bottom end is open. The pump casing sleeve 2 includes a sleeve body 21 and a connecting portion 22 connected to the sleeve body 21. The connecting portion 22 is located at the bottom end of the pump casing sleeve 2, and includes a connecting portion body 221 and a pin assembly. The connecting portion body 221 is provided with a first sealing groove 2211. The pin assembly includes a pin seat and a pin 224 inserted into the pin seat. The pin seat includes an inner pin seat 222 located on the inner side of the first sealing groove 2211 and an outer pin seat 223 located on the outer side of the first sealing groove 2211. The sleeve body 21 includes an inner sleeve 211 and an outer sleeve 212 fixed to each other. The inner sleeve 211 is located in the inner cavity of the outer sleeve 212 and is a coaxial cylinder with the outer sleeve 212. The first sealing groove 2211 is an annular groove.

[0035] The pump housing of this embodiment, on the one hand, through the double-layer design of the pump housing sleeve 2, compared with the conventional pump housing, the outer side of the stator can be in contact with the inner sleeve 211. Since there is a certain space between the inner sleeve 211 and the outer sleeve 212 directly below, it is possible to set the inner needle seat 222 at the bottom of the pump housing sleeve 2 on the inner side of the outer sleeve 212. Therefore, there is no need to design the bottom of the pump housing sleeve 2 (i.e., the connecting portion 22) with a special shape to accommodate the inner needle seat 222, so that the first sealing groove 2211 provided on the connecting portion 22 for connecting to the bottom cover of the shielded pump is annular, and an O-ring can be used as the sealing ring for sealing and fixing the pump housing sleeve 2 and the bottom cover, which is conducive to convenient production and improved production efficiency; on the other hand, the pump housing sleeve 2 is designed as a double-layer structure of the inner sleeve 211 and the outer sleeve 212, rather than integrating the two into one sleeve. For the pump housing sleeve 2 manufactured by injection molding, it can effectively avoid defects such as injection shrinkage holes caused by thick wall thickness.

[0036] As an embodiment, the pump housing sleeve 2 may also include a sleeve connecting portion 213 for connecting the inner sleeve 211 and the outer sleeve 212. The sleeve connecting portion 213, the inner sleeve 211 and the outer sleeve 212 together enclose a second annular groove 214, and the second annular groove opens upward or downward. The second annular groove can reduce weight and the injection molding defect rate on the one hand, and can also reduce vibration when the shielded pump is running, and reduce noise at the same time; the opening of the second annular groove can be either upward or downward. In one embodiment, Figures 2 to 4 As shown, the second annular groove 214 opens upward, and this opening form facilitates the injection of coolant into the second annular groove for cooling the stator; in another embodiment, as shown Figures 5 to 7As shown, the second annular groove 214 opens downward. As a preferred embodiment, the pump casing sleeve 2 may further include a first reinforcing rib 215 disposed in the second annular groove 214, and the first reinforcing rib 215 connects the inner sleeve 211 and the outer sleeve 212. The strength of the sleeve body 21 can be improved by disposing the first reinforcing rib 215. It is preferred to dispose a plurality of first reinforcing ribs 215 and evenly distribute them along the circumferential direction, such as Figure 3 , 5 shown.

[0037] As a preferred embodiment, the inner needle seat 222 is connected to and protrudes from the inner wall of the connecting body 221, and the pump housing sleeve 2 may also include a first protrusion 23, which is fixed to the inner wall of the outer sleeve 212, regardless of whether the second annular groove 214 opens upward (such as Figure 2 as shown) or with the opening facing downwards (as shown Figure 6 , 7 As shown in FIG. 2 , the first protrusion 23 connects the sleeve connecting portion 213 and the inner needle seat 222; the minimum distance from the first protrusion 23 to the axis is not greater than the minimum distance from the inner needle seat 222 to the axis, and is not less than the inner diameter of the inner sleeve 211. This preferred embodiment is very beneficial for pump housings manufactured by injection molding, because the injection molding generally adopts a demoulding method from top to bottom, and the inner needle seat 222 is located at the bottom of the pump housing sleeve 2 and is convex. If the first protrusion 23 is not provided, demoulding will be impossible. In a further preferred embodiment, as Figure 8 As shown, the outer wall of the pump casing sleeve 2 may be provided with a third groove 24, respectively referring to Figure 6 , 8 9. The first protrusion 23 and the third groove 24 are respectively located at corresponding positions of the pump casing sleeve 2. Due to the setting of the first protrusion 23, the total thickness of the outer sleeve 212 and the first protrusion 23 is thicker. For the injection-molded pump casing, the outer sleeve 212 and the first protrusion 23 are integrally molded. Compared with other positions of the outer sleeve 212, it is easier to produce defects such as injection shrinkage holes. By matching the third groove 24 with the first protrusion 23, the injection thickness is uniform, which can effectively eliminate injection defects. The third groove can be opened only on the outer sleeve; or it can be more recessed inward from the outer wall surface of the outer sleeve, such as Figure 6 , 8 As shown, the depth of the third groove 24 is greater than the thickness of the outer sleeve 212. It not only penetrates the outer sleeve wall, but also extends to the first protrusion 23 and is recessed. Figure 5 , 8As shown, the first protrusion 23 includes a first surface 231 facing the axis, and the first surface 231 and the bottom surface of the third groove 24 are both arc surfaces. On the other hand, as a preferred embodiment, since the provision of the third groove 24 may weaken the strength of the third groove 24, the pump casing sleeve 2 may also include a second reinforcing rib 25. The second reinforcing rib 25 is protruding and fixed to the bottom surface of the third groove 24 and connects the two opposite walls of the third groove 24. The provision of the second reinforcing rib 25 can effectively increase the strength of the third groove 24. In a further preferred embodiment, the pump casing sleeve 2 may also include a third reinforcing rib 26. The provision of the second reinforcing rib 26 can further strengthen the strength of the third groove 24. The third reinforcing rib 26 is protruding and fixed to the bottom surface of the third groove 24 and connects the other two opposite walls of the third groove 24. The third reinforcing rib 26 intersects with the second reinforcing rib 25. In a specific embodiment, the second reinforcing rib 25 extends along the axial direction of the sleeve body 21, and the second reinforcing rib 26 and the second reinforcing rib 25 are perpendicular to each other, such as Figure 8 As shown; the distance between the outer side surface of the second reinforcing rib 25 and the axis center is preferably greater than the outer diameter of the outer sleeve 212. Since the shielded pump needs to be fixed to the mounting bracket 7 on the car when it is used in the car, the distance between the outer side surface of the second reinforcing rib 25 and the axis center is greater than the outer diameter 212 of the outer sleeve, that is, the second reinforcing rib 25 protrudes from the outer sleeve, and a groove 71 is correspondingly provided on the mounting bracket 7, so that the second reinforcing rib 25 can be stuck in the groove 71, which is beneficial to prevent the shielded pump from slipping in the circumferential direction relative to the mounting bracket 7. Of course, there can be other corresponding matching structures between the second reinforcing rib and the mounting bracket, as long as it can prevent the shielded pump from slipping in the circumferential direction relative to the mounting bracket 7. For example, the outer side surface of the second reinforcing rib can be located on the same arc surface as the outer surface of the outer sleeve 212, or the second reinforcing rib can be completely arranged in the third groove 24. Accordingly, a protrusion protruding toward the third groove is provided on the mounting bracket 7, and then a groove for clamping the second reinforcing rib is provided on the protrusion, as shown in FIG. Fig.12 As shown. As an implementation method, the isolation sleeve 1 and the pump casing sleeve 2 can be integrally formed, and the minimum distance from the inner needle seat to the axis is smaller than the inner diameter of the outer sleeve, but not smaller than the inner diameter of the inner sleeve. The pump casing is integrally formed, which is convenient for manufacturing. In addition, since the minimum distance from the inner needle seat to the axis is smaller than the inner diameter of the outer sleeve, but not smaller than the inner diameter of the inner sleeve, the inner needle seat makes full use of the radial space between the inner sleeve and the outer sleeve, so that the first sealing groove between the inner needle seat and the outer needle seat can be set into a ring shape without expanding its diameter. In addition, the above specific structural setting can also ensure that the stator can smoothly enter from the bottom of the pump casing sleeve to between the inner sleeve and the isolation sleeve when the shielded pump is assembled.

[0038] As an embodiment, the connecting portion body 221 is annular, and the first sealing groove 2211 is located on the outer side of the outer sleeve 212. Figure 2 , 6 The first sealing groove 2211 can be arranged below the outer sleeve 212 or outside the outer sleeve 212 according to the thickness of the outer sleeve 212; when arranged below the outer sleeve 212, the wall thickness of the outer sleeve 212 needs to be thicker, which may cause poor injection molding; when arranged outside the outer sleeve 212, the pump housing sleeve 2 has a certain radial outward expansion space, which can ensure that the inner pin seat 222 is located inside the first sealing groove 2211 while reducing the wall thickness of the outer sleeve.

[0039] Example 2

[0040] like Figures 13-14 As shown, the shielded pump of this embodiment includes a pump cover 3, a bottom cover 4, a stator 6 and a pump housing of the present invention. The isolation sleeve 1 is used to accommodate the rotor assembly. The pump cover 3 is fixed to one end of the pump housing, and the bottom cover 4 is fixed to the connecting portion 22 at the open end of the pump housing. When the bottom cover 4 is sealed and fixed to the pump housing, the O-ring 5 is arranged in the first sealing groove 2211, and the stator 6 is arranged between the isolation sleeve 1 and the inner sleeve 211. Fig.12 , which is a cross-sectional view of the canned motor pump when the second annular groove 214 opens upward; Fig.13 It is a cross-sectional view of the canned motor pump when the second annular groove 214 opens downward.

[0041] The shielded pump of this embodiment has a specific structural setting of the pump casing, so that the connecting surface between the bottom cover and the pump casing is annular, and the production of the pump casing and the bottom cover is more convenient; and the sealing and fixing between them can use a regularly shaped sealing ring, such as an O-ring. The regularly shaped sealing ring is not only more common and easy to obtain, but also convenient for the workers' installation operation, which greatly improves the production efficiency of the shielded pump.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the description of the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A pump housing of a shielded pump, comprising an isolation sleeve and a pump housing sleeve, wherein the top of the pump housing sleeve is fixed to the isolation sleeve and the bottom is open, the pump housing sleeve comprises a sleeve body and a connecting portion connected to the sleeve body, the connecting portion is located at the bottom end of the pump housing sleeve, comprises a connecting portion body and a pin assembly, the connecting portion body is provided with a first sealing groove, the pin assembly comprises a pin seat and a pin inserted into the pin seat, the pin seat comprises an inner pin seat located inside the first sealing groove and an outer pin seat located outside the first sealing groove, characterized in that: The sleeve body includes an inner sleeve and an outer sleeve fixed to each other, the inner sleeve is located in the inner cavity of the outer sleeve and is a coaxial cylinder with the outer sleeve, and the first sealing groove is an annular groove; the pump casing sleeve also includes a sleeve connecting portion for connecting the inner sleeve and the outer sleeve; the inner needle seat is connected to and protrudes from the inner wall of the connecting portion body; the pump casing sleeve also includes a first protrusion, the first protrusion is fixed to the inner wall of the outer sleeve, and connects the sleeve connecting portion and the inner needle seat, the minimum distance from the first protrusion to the axis center is not greater than the minimum distance from the inner needle seat to the axis center, and is not less than the inner diameter of the inner sleeve.

2. The pump housing of the canned motor pump according to claim 1, characterized in that: The sleeve connecting portion, the inner sleeve and the outer sleeve together enclose a second annular groove, and the second annular groove opens upward or downward; the pump casing sleeve also includes a first reinforcing rib arranged in the second annular groove, and the first reinforcing rib connects the inner sleeve and the outer sleeve.

3. The pump housing of the canned motor pump according to claim 1, characterized in that: A third groove is formed on the outer wall of the pump casing sleeve, and the first protrusion and the third groove are respectively located at corresponding positions of the pump casing sleeve.

4. The pump housing of the canned motor pump according to claim 3, characterized in that: The pump casing sleeve further comprises a second reinforcing rib, wherein the second reinforcing rib protrusion is fixed to the bottom surface of the third groove and connects two opposite wall surfaces of the third groove.

5. The pump housing of the canned motor pump according to claim 4, characterized in that: The pump casing sleeve also includes a third reinforcing rib, which is protruded and fixed to the bottom surface of the third groove and connects the other two opposite walls of the third groove. The distance between the outer side surface of the second reinforcing rib and the axis is greater than the outer diameter of the outer sleeve.

6. The pump housing of the canned motor pump according to claim 1, characterized in that: The isolation sleeve and the pump housing sleeve are integrally formed, and the minimum distance from the inner needle seat to the axis is smaller than the inner diameter of the outer sleeve, but not smaller than the inner diameter of the inner sleeve.

7. The pump housing of the canned motor pump according to claim 1, characterized in that: The connecting portion body is annular, and the first sealing groove is located on the outside of the outer sleeve.

8. A canned motor pump, characterized in that: It comprises a pump cover, a bottom cover, a stator and a pump casing as described in any one of claims 1 to 7, wherein the pump cover is fixed to one end of the pump casing, the bottom cover is fixed to the open end of the pump casing sleeve, and the stator is arranged between the isolation sleeve and the inner sleeve.

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