Connecting structure of machine shell and driving rear cover and electronic water pump

Abstract

The utility model relates to the technical field of water pumps, in particular to a connecting structure of a machine shell and a driving rear cover and an electronic water pump, which comprises the machine shell, the rear cover located at the rear end of the machine shell and a middle plate located between the machine shell and the rear cover and used for connecting the machine shell and the rear cover. The middle plate comprises a plate body and a protruding part protruding from the end face of the plate body to the rear cover, the plate body is attached to the inner wall of the machine shell and fixed through a first bolt, a first sealing piece is installed between the plate body and the inner wall of the machine shell, the protruding part is attached to the inner wall of the rear cover and fixed through a second bolt, and a second sealing piece is installed between the protruding part and the rear cover. According to the utility model, the plate body of the middle plate is connected with the casing, the protruding part is connected with the rear cover to fix the casing and the rear cover, the first bolt and the second bolt are screwed in along the radial direction, the length is shorter, interference with a circuit is avoided, and double sealing is realized through the first sealing ring and the second sealing ring, so that the sealing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a connection structure between a casing and a driving rear cover and an electronic water pump. Background Art

[0002] Chinese patent application number CN202223087775.6 discloses a centrifugal water pump with an integrated pump casing structure, which includes an integrated pump casing, a drive assembly and a back cover. The drive assembly includes a rotor assembly, a stator assembly, an impeller and a drive circuit board. The drive circuit board is electrically connected to the stator assembly. The back cover is closed at the opening of the integrated pump casing and covers the drive assembly. A back cover sealing ring is provided between the integrated pump casing and the back cover. In this application, the back cover and the integrated pump casing are fixed to each other by screw locking. The screws are screwed into the pump casing from the end face of the back cover. The required screw length is long and may interfere with the drive circuit board. There is only one seal between the pump casing and the back cover, and the sealing effect is poor. Utility Model Content

[0003] The technical problem to be solved by the present utility model is: in order to solve the problems in the prior art that the screws required for connecting the pump casing and the rear cover are long and may interfere with the driving circuit board, and there is only one seal between the pump casing and the rear cover, resulting in poor sealing effect, a connection structure between the casing and the driving rear cover and an electronic water pump are now provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a connection structure between a housing and a drive rear cover, comprising a housing, a rear cover located at the rear end of the housing, and an intermediate plate located between the housing and used to connect the two, wherein the housing and the intermediate plate enclose a first cavity for mounting a stator assembly, and the intermediate plate and the rear cover enclose a second cavity for mounting a circuit board;

[0005] The intermediate plate includes a plate body and a protrusion protruding from the end surface of the plate body toward the rear cover. The plate body is fitted with the inner wall of the housing, the two are fixed by a first bolt, and a first seal is installed between the two. The protrusion is fitted with the inner wall of the rear cover, the two are fixed by a second bolt, and a second seal is installed between the two.

[0006] Furthermore, the inner peripheral wall of the rear end of the housing is provided with a first abutting portion for abutting against the plate body to axially limit the intermediate plate, and the first abutting portion is provided with a first annular groove for installing a first sealing member.

[0007] Furthermore, the inner peripheral wall at the front end of the rear cover is provided with a second abutting portion for abutting against the protruding portion to axially limit the intermediate plate.

[0008] Furthermore, a connecting portion for connecting the protruding portion and the plate body is provided between the protruding portion and the plate body, the connecting portion is in contact with the inner wall of the rear cover and is provided with a second annular groove for installing a second sealing member.

[0009] Furthermore, the plate body protrudes toward the housing to form a convex ring, and a rear installation cavity for installing the rear end of the shaft is formed inside the convex ring. The front end of the housing is bent to form a front installation cavity for installing the front end of the shaft.

[0010] Furthermore, the outer peripheral wall of the convex ring is an avoidance conical surface that is smaller in the front and larger in the back.

[0011] Furthermore, there are a plurality of protrusions, and the protrusions are spaced apart along the circumference of the plate.

[0012] An electronic water pump comprises the connection structure between the casing and the driving rear cover.

[0013] The beneficial effects of the present invention are as follows: the present invention utilizes the plate body of the middle plate to connect with the casing, and the protrusion to connect with the rear cover to fix the casing and the rear cover, and the first bolt and the second bolt are both screwed in radially, with a short length, and will not interfere with the circuit, and double sealing is achieved by the first sealing ring and the second sealing ring, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is the main view of the utility model;

[0017] Figure 3 It is a cross-sectional view of the utility model;

[0018] Figure 4 yes Figure 3 A partial enlarged view of part A;

[0019] Figure 5 It is a three-dimensional schematic diagram of the middle plate from the first perspective;

[0020] Figure 6 It is a three-dimensional schematic diagram of the middle plate from the second perspective;

[0021] Figure 7 It is a side view of the middle plate.

[0022] In the picture:

[0023] 1. Casing; 101. First abutment portion; 102. First annular groove; 2. Rear cover; 201. Second abutment portion; 3. Intermediate plate; 301. Plate body; 302. Protrusion; 303. Protruding ring; 304. Connecting portion; 305. Second annular groove; 306. Connecting hole; 4. Stator assembly; 5. First chamber; 6. Second chamber; 7. First sealing member; 8. Second sealing member; 9. First bolt; 10. Second bolt; 11. Circuit board; 12. Rotating shaft. DETAILED DESCRIPTION

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0025] like Figure 1-Figure 3 As shown, a connection structure between a casing and a driving rear cover comprises a casing 1, a rear cover 2 located at the rear end of the casing 1 and an intermediate plate 3 located between the two and used to connect the two. The rear end face of the casing 1 is fitted with the front end face of the rear cover 2 to enclose a cavity. The intermediate plate 3 is located in the cavity, and the casing 1 and the intermediate plate 3 enclose a first chamber 5 for installing a stator assembly 4. The intermediate plate 3 and the rear cover 2 enclose a second chamber 6 for installing a circuit board 11. The outer wall of the rear cover 3 is provided with heat dissipation ribs, and the inner wall protrudes with a plurality of connecting columns for threaded connection with the circuit board. The number of connecting columns can be but is not limited to two, three or four, etc. The intermediate plate 3 is provided with a connecting hole for connecting the first chamber 5 with the second chamber 6.

[0026] The middle plate 3 includes a plate body 301 and a protrusion 302 protruding from the end surface of the plate body 301 toward the rear cover 2. The plate body 301 is fitted against the inner wall of the casing 1, and the two are fixed by a first bolt 9 with a first seal 7 installed therebetween. The protrusion 302 is fitted against the inner wall of the rear cover 2, and the two are fixed by a second bolt 10 with a second seal 8 installed therebetween. The first seal 7 and the second seal 8 can be, but are not limited to, O-rings. The positions and quantities of the first bolt 9 and the second bolt 10 correspond to each other, and both are screwed in radially, and are short in length so as not to interfere with the circuit board in the second chamber. In addition, the first seal ring and the second seal ring achieve double sealing, which improves the sealing effect and reduces the probability of failure of the internal circuit board or stator assembly due to moisture.

[0027] In some examples, such as Figure 3 and Figure 4As shown, the inner circumferential wall at the rear end of the casing 1 is provided with a first abutting portion 101 for abutting against the plate body 301 to axially limit the intermediate plate 3. The first abutting portion 101 is formed by a recess in the inner circumferential wall of the casing 1. During installation, the plate body 301 is sent into the inner cavity of the casing 1. When the plate body 301 abuts against the first abutting portion 101, it is installed in place. Then the two can be fixed by the first bolt 9. The first abutting portion 101 is provided with a first annular groove 102 for installing the first sealing member 7. The first sealing member 7 is installed between the first abutting portion 101 and the end face of the plate body 301. The first sealing member 7 is located at the front end of the first bolt 9.

[0028] In some examples, such as Figure 3 and Figure 4 As shown, the inner peripheral wall of the front end of the rear cover 2 is provided with a second abutting portion 201 for abutting against the protrusion 302 to axially limit the intermediate plate 3. The second abutting portion 201 is formed by a recess in the inner wall of the rear cover 2. During installation, the protrusion 302 is allowed to enter the inner cavity of the rear cover 2. When the protrusion 302 is in contact with the second abutting portion 201, the protrusion 302 is installed in place, and then the two can be fixed by the second bolt 10.

[0029] In some examples, such as Figure 5-Figure 7 As shown, a connecting portion 304 for connecting the protrusion 302 and the plate body 301 is provided between the protrusion 302 and the plate body 301, and the connecting portion 304 is in contact with the inner wall of the rear cover 2. The outer diameters of the connecting portion 304 and the protrusion 302 are smaller than the outer diameter of the plate body 301, that is, the plate body 301 protrudes radially from the connecting portion 304 and the protrusion 302 to form a first step surface, and the inner wall of the casing 1 and the inner wall of the rear cover 2 form a second step surface, and the first step surface abuts the second step surface, and the connecting portion 304 is provided with a second annular groove 305 for installing the second seal 8, and the second seal 8 is located at the front end of the second bolt 10.

[0030] In some examples, the plate body 301 protrudes toward the direction of the casing 1 to form a convex ring 303, and a rear installation cavity for installing the rear end of the rotating shaft 12 is formed on the inner side of the convex ring 303. A rear bearing is installed between the walls of the rear installation cavity of the rotating shaft 12. The front end of the casing 1 is bent to form a front installation cavity for installing the front end of the rotating shaft 12. A front bearing is installed between the rotating shaft 12 and the wall of the front installation cavity, and a stator assembly 4 is installed in the middle of the rotating shaft 12.

[0031] In some examples, the outer peripheral wall of the protruding ring 303 is a conical surface that is smaller in the front and larger in the back, so as to avoid the stator assembly 4 .

[0032] In some examples, there are multiple protrusions 302 , and the multiple protrusions 302 are spaced apart along the circumference of the plate 301 . The number of protrusions 302 may be, but is not limited to, two, three, or four, etc., which is not limited in this embodiment.

[0033] In some examples, an electronic water pump includes the connection structure between the above-mentioned casing and the drive rear cover, the casing is provided with a water inlet and a water outlet, and a rotating shaft is installed inside the casing, a stator assembly is installed in the middle of the rotating shaft, and an impeller is installed at the end of the rotating shaft.

[0034] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A connection structure between a housing and a drive rear cover, characterized in that: The invention comprises a housing (1), a rear cover (2) located at the rear end of the housing (1), and an intermediate plate (3) located between the housing and used to connect the two, wherein the housing (1) and the intermediate plate (3) enclose a first chamber (5) for installing a stator assembly (4), and the intermediate plate (3) and the rear cover (2) enclose a second chamber (6) for installing a circuit board (11); The intermediate plate (3) comprises a plate body (301) and a protruding portion (302) protruding from an end surface of the plate body (301) in a direction toward the rear cover (2); the plate body (301) is in contact with the inner wall of the housing (1); the two are fixed by a first bolt (9) and a first sealing member (7) is installed between the two; the protruding portion (302) is in contact with the inner wall of the rear cover (2); the two are fixed by a second bolt (10) and a second sealing member (8) is installed between the two.

2. The connection structure between the housing and the drive rear cover according to claim 1, characterized in that: The inner peripheral wall at the rear end of the housing (1) is provided with a first abutting portion (101) for abutting against the plate body (301) to axially limit the intermediate plate (3), and the first abutting portion (101) is provided with a first annular groove (102) for installing a first sealing member (7).

3. The connection structure between the housing and the drive rear cover according to claim 1, characterized in that: The inner peripheral wall at the front end of the rear cover (2) is provided with a second abutting portion (201) for abutting against the protruding portion (302) to axially limit the intermediate plate (3).

4. The connection structure between the housing and the drive rear cover according to claim 1, characterized in that: A connecting portion (304) for connecting the protruding portion (302) and the plate body (301) is provided between the protruding portion (302) and the plate body (301). The connecting portion (304) is in contact with the inner wall of the rear cover (2) and is provided with a second annular groove (305) for installing a second sealing member (8).

5. The connection structure between the housing and the drive rear cover according to claim 1, characterized in that: The plate body (301) protrudes toward the housing (1) to form a convex ring (303), and a rear installation cavity for installing the rear end of the rotating shaft (12) is formed inside the convex ring (303). The front end of the housing (1) is bent to form a front installation cavity for installing the front end of the rotating shaft (12).

6. The connection structure between the housing and the driving rear cover according to claim 5, characterized in that: The outer peripheral wall of the convex ring (303) is a conical surface that is smaller in the front and larger in the back.

7. The connection structure between the housing and the driving rear cover according to claim 1, characterized in that: There are a plurality of protrusions (302), and the protrusions (302) are distributed at intervals along the circumference of the plate body (301).

8. An electronic water pump, characterized in that: It comprises the connection structure between the housing and the drive rear cover as described in any one of claims 1 to 7.

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