Eccentric bushing and eccentric bushing assembly

Abstract

A shaft hole is formed in the eccentric sleeve, the shaft hole extends to the axial end of the eccentric sleeve to form an opening, a shoulder protruding in the radial direction is arranged outside the eccentric sleeve, the end, away from the opening, of the shoulder is a plane end, the end, where the opening is located, of the eccentric sleeve is a first inclined face end, and the other end, where the opening is located, of the eccentric sleeve is a second inclined face end. The end, back to the opening, of the eccentric sleeve is a second inclined face end, the first inclined face end is parallel to the second inclined face end, and the first inclined face end is not parallel to the plane where the plane end is located and is perpendicular to the shaft hole. The bottom end of the eccentric sleeve is arranged at the second inclined plane end parallel to the first inclined plane end, so that when the first inclined plane end is perpendicular to the motor shaft, the first inclined plane end and the second inclined plane end are both in a horizontal state, and a conventional vertical crimping head and a crimping method that the motor shaft faces upwards are adopted.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm pumps, in particular to an eccentric sleeve and an eccentric sleeve assembly. Background Art

[0002] With the development of the home appliance industry and the upgrading of electrical appliances, diaphragm pumps are needed in more and more places.

[0003] The eccentric sleeve is the core part of the diaphragm pump, and the eccentric assembly assembled by it determines the performance of the diaphragm pump. The eccentric assembly used in the diaphragm pump on the market currently has a unique eccentric structure, such as the eccentric sleeve disclosed in CN216589054U, whose two end faces are not parallel. When crimping with the motor, the motor shaft is placed upward and the shaft hole of the eccentric sleeve is aligned with the motor shaft. At this time, the upward side of the eccentric sleeve is tilted, so it is necessary to use a universal crimping head to align the end face of the eccentric sleeve for crimping. The equipment requirements are high, and the universal crimping head moves vertically downward during crimping. At this time, the inclination of the upper surface of the eccentric sleeve will cause the eccentric sleeve to have a component force in the horizontal direction, causing the eccentric sleeve to move horizontally. Therefore, the eccentric sleeve needs to be manually adjusted continuously during the crimping process. The entire crimping process is cumbersome and the efficiency is extremely low.

[0004] Therefore, it is necessary to design an eccentric sleeve structure that can be crimped in a simpler and more efficient manner. Utility Model Content

[0005] In order to solve the technical problems in the prior art such as easy horizontal deviation, high requirements for crimping equipment and low crimping efficiency when the eccentric sleeve is crimped with the motor, the utility model provides an eccentric sleeve and an eccentric sleeve assembly to solve the above problems.

[0006] The utility model proposes an eccentric sleeve, wherein the eccentric sleeve has an axial hole inside, the axial hole extends to one axial end of the eccentric sleeve to form an opening, the eccentric sleeve has a radially raised shoulder outside, the end of the shoulder away from the insertion port is a plane end, the end of the eccentric sleeve where the opening is located is a first bevel end, the end of the eccentric sleeve facing away from the opening is a second bevel end, the first bevel end is parallel to the second bevel end, the first bevel end is not parallel to the plane where the plane end is located and is arranged perpendicular to the axial hole.

[0007] Furthermore, the outer end surface of the bearing of the eccentric sleeve assembly is aligned with the lowest point or the highest point of the second bevel end or is located between the lowest point and the highest point of the second bevel end.

[0008] Furthermore, the end surface of the eccentric sleeve where the second bevel end is located is provided with a positioning structure that can cooperate with an external mounting fixture to keep the shaft hole vertical.

[0009] Furthermore, the positioning structure has an axial end face and a positioning side face, and the axial section where the highest point and the lowest point of the first bevel end are located is the first plane. The axial end face and / or the positioning side face can rotate the first bevel end around the normal of the first plane to a horizontal state.

[0010] Furthermore, the axial end surface is parallel to the plane end.

[0011] Furthermore, the positioning structure is a positioning groove recessed inwardly from the end surface of the eccentric sleeve or a positioning protrusion protruding from the end surface of the eccentric sleeve.

[0012] Furthermore, the eccentric sleeve includes a first shaft segment and a second shaft segment axially connected, the diameter of the first shaft segment is larger than the diameter of the second shaft segment, the opening and the first bevel end are located at one end of the first shaft segment, the plane end is located at the other end of the first shaft segment, and the positioning structure and the second bevel end are located at the end of the second shaft segment.

[0013] Furthermore, the cross section of the positioning groove or positioning protrusion is in the shape of a straight line.

[0014] Furthermore, the width of the positioning structure is 20%-40% of the outer diameter of the second shaft segment; the depth of the positioning structure is 40%-60% of the axial length of the second shaft segment.

[0015] The utility model also proposes an eccentric sleeve assembly, including a thrust ring, a gasket, a bearing, a diaphragm seat and the eccentric sleeve mentioned above, wherein the bearing axial limit is located between the diaphragm seat and the plane end, the inner bracket of the bearing is connected to the outer circumferential surface of the eccentric sleeve, the outer bracket of the bearing is connected to the diaphragm seat, and the thrust ring, gasket, bearing and diaphragm seat are axially connected and fixed in sequence.

[0016] The beneficial effects of the utility model are:

[0017] (1) In the utility model, a second bevel end is arranged at the bottom end of the eccentric sleeve and is parallel to the first bevel end. In this way, when the first bevel end is perpendicular to the motor shaft, the first bevel end and the second bevel end are both in a horizontal state, and a conventional vertical crimping head and a crimping method with the motor shaft facing upward can be adopted.

[0018] (2) The utility model is provided with a positioning structure on the second bevel end. The positioning structure can be used to adopt a crimping method in which the motor is eccentrically sleeved at the bottom and at the top. After the second bevel end and the positioning structure are combined, two assembly methods can be adopted, which has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 This is a front view of a specific implementation of the eccentric sleeve described in the utility model;

[0021] Figure 2 It is a stereoscopic diagram of a specific implementation of the eccentric sleeve described in the utility model (biased to the first inclined surface end perspective);

[0022] Figure 3 It is a stereoscopic diagram of a specific embodiment of the eccentric sleeve described in the utility model (biased to the second inclined surface end perspective);

[0023] Figure 4 It is an axial cross-sectional view of the eccentric sleeve assembly described in the utility model;

[0024] Figure 5 It is an exploded view of a specific implementation of the eccentric sleeve assembly described in the utility model;

[0025] Figure 6 It is an axial cross-sectional view of a specific implementation of the eccentric sleeve assembly described in the utility model (the mounting fixture is not assembled).

[0026] In the figure, 1, eccentric sleeve, 101, shaft hole, 102, opening, 103, plane end, 104, first bevel end, 105, second bevel end, 106, positioning structure, 2, mounting fixture, 201, limit portion, 202, bearing plate, 3, first plane, 4, axial end face, 5, positioning side face, 6, first shaft section, 7, second shaft section, 8, thrust ring, 9, gasket, 10, bearing, 11, diaphragm seat, 12, fastening screw, 13, carrier, 14, base, 15, eccentric sleeve assembly. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Embodiment 1

[0029] like Figure 1 and Figure 2As shown, an eccentric sleeve is provided with an axial hole 101 inside the eccentric sleeve 1, and the axial hole 101 extends to one axial end of the eccentric sleeve 1 to form an opening 102. When the eccentric sleeve assembly 15 is crimped with the motor, the motor shaft is inserted into the axial hole 101 from the opening 102. The outside of the eccentric sleeve 1 has a radially protruding shoulder, and the protruding shoulder makes the eccentric sleeve 1 form a stepped shaft structure. The shaft section with a smaller outer diameter is used to be fixed with the inner bracket of the bearing 10 of the eccentric sleeve assembly 15, and the flat end 103 is used to abut against the end face of the inner bracket of the bearing 10. The end of the shoulder away from the insertion port is the flat end 103, and the end of the eccentric sleeve 1 where the opening 102 is located is the first bevel end 104, and the end of the eccentric sleeve 1 facing away from the opening 102 is the second bevel end 105, the first bevel end 104 is parallel to the second bevel end 105, the first bevel end 104 is not parallel to the plane where the flat end 103 is located, and is arranged perpendicular to the axial hole 101.

[0030] The utility model improves the traditional crimping surface (the end surface facing away from the shaft hole 101, i.e. the second bevel end 105 in the utility model) to be parallel to the first bevel end 104. During crimping, the motor is located at the bottom, and after the motor shaft is inserted into the shaft hole 101, the first bevel end 104 is horizontal (the first bevel end 104 is located at the bottom). At this time, the second bevel end 105 located at the top is also horizontal. Therefore, a conventional vertical crimping head can be used for crimping. There is no need to adjust the posture of the crimping head in real time during the crimping process, thereby improving the crimping efficiency.

[0031] In the preferred embodiment, the outer end face of the bearing 10 of the eccentric sleeve assembly 15 is aligned with the lowest point or the highest point of the second bevel end 105 or is located between the lowest point and the highest point of the second bevel end 105. When the eccentric sleeve assembly 15 is assembled, the shaft section where the second bevel end 105 is located is located at the inner ring of the bearing 10. In the traditional structure, the end face of the eccentric sleeve 1 facing away from the shaft hole 101 is parallel to the plane end 103 and is approximately aligned with the outer end face of the bearing 10. The second bevel end 105 in the utility model can be formed by cutting inwardly on the basis of the traditional end face of the eccentric sleeve 1. At this time, the lowest point of the second bevel end 105 is close to the outer end face of the bearing 10 (such as Figure 6 As shown); the second bevel end 105 can also be formed by filling the structure outward on the basis of the traditional eccentric sleeve 1 end face. In this case, the highest point of the second bevel end 105 is close to the outer end face of the bearing 10. The second bevel end 105 can also be partially located inside the bearing 10 and partially protrude outside the bearing 10, that is, the outer end face of the bearing 10 is located between the lowest point and the highest point of the second bevel end 105.

[0032] Embodiment 2

[0033] Based on the first embodiment, Figure 2-Figure 4As shown, the end face of the eccentric sleeve 1 where the second bevel end 105 is located is provided with a positioning structure 106 that can cooperate with the external mounting fixture 2 to keep the shaft hole 101 vertical; the mounting fixture 2 is matched with the eccentric sleeve 1, and its top has a limiting portion 201 that cooperates with the positioning structure 106 and a bearing plate 202 that abuts against the end face of the bearing 10 of the eccentric sleeve assembly 15. When the positioning structure 106 is assembled with the limiting portion 201, the shaft hole 101 is vertical. The bearing plate 202 plays a role in supporting the eccentric sleeve assembly 15 in the crimping method with the motor on top.

[0034] In this embodiment, a positioning structure 106 is added to the end of the eccentric sleeve 1 in the first embodiment, so that the crimping surface can be adjusted from the second bevel end 105 to the first bevel end 104. The pre-installed posture of the eccentric sleeve 1 is adjusted by cooperating with the positioning structure 106 and the limiting portion 201, and the first bevel end 104 is adjusted to a horizontal state, so that the crimping can be performed with the motor shaft facing downward. The press directly crimps the tail of the motor to keep the press, the motor, and the eccentric sleeve 1 on the same vertical line. This method does not require the use of a universal joint, and only a simpler vertical joint is required. The vertical joint does not need to adjust its position in real time (no horizontal displacement will occur), thereby improving the crimping efficiency and the crimping success rate.

[0035] After the second bevel end 105 is combined with the positioning structure 106 , the two assembly modes of crimping can be adopted, with the motor shaft facing upward or downward, which has better applicability.

[0036] When the plane end 103 is in a horizontal state, the first bevel end 104 is inclined. At this time, the first bevel end 104 has a highest point and a lowest point. An axial section is cut through the highest point and the lowest point on the eccentric sleeve 1 to obtain a first plane 3, that is, Figure 6 The plane where the shadow surface in the figure is located, the first bevel end 104 can be regarded as an inclined surface obtained by rotating around the normal of the plane. Therefore, if you want to adjust the first bevel end 104 to a horizontal state, the simplest way is to rotate the eccentric sleeve 1 as a whole in the opposite direction around the normal of the first plane 3. In a specific embodiment of the utility model, the positioning structure 106 has an axial end face 4 and a positioning side face 5. The axial end face 4 and / or the positioning side face 5 can rotate the first bevel end 104 around the normal of the first plane 3 to a horizontal state, that is, the two ends are made horizontal by raising the lowest point of the first bevel end 104 or sinking the highest point of the first bevel end 104. When the axial end face 4 abuts against the mounting fixture 2, the axial end face 4 can play an axial limiting role, and the positioning side face 5 is only used for radial limiting. The axial end face 4 and the positioning side face 5 cooperate to adjust the first bevel end 104 to a horizontal state. The first bevel end 104 can also be adjusted to be horizontal by positioning the structure of the side surface 5 itself (such as a curved surface design). At this time, the axial end surface 4 may not abut against the mounting fixture 2, and support can be achieved only by the contact between the bearing 10 and the bearing plate 202.

[0037] When the axial end face 4 is used for axial positioning, the axial end face 4 is preferably parallel to the plane end 103. During installation, the axial end face 4 is tilted in the opposite direction to the first bevel end 104 to make the originally tilted first bevel end 104 reach a horizontal state.

[0038] The positioning structure 106 can be a positioning groove recessed inwardly from the end surface of the eccentric sleeve 1 or a positioning protrusion protruding from the end surface of the eccentric sleeve 1. Specifically, the positioning structure 106 can be only a positioning groove, or only a positioning protrusion, or a combination of a positioning groove and a positioning protrusion. Usually, only a positioning groove or a positioning protrusion needs to be designed separately. When a positioning groove is used, the inner side surface of the positioning groove is the positioning side surface 5, and when a positioning protrusion is used, the outer side surface of the positioning protrusion is the positioning side surface 5.

[0039] Regarding the shape of the positioning structure 106 , taking the positioning groove as an example (the same applies to the positioning boss), the positioning groove can have a non-circular cross section or a circular cross section, such as a semicircular, polygonal, straight, etc.

[0040] In the specific implementation of the present utility model, the positioning structure 106 is a straight-line positioning groove, such as Figure 3 and Figure 6 As shown, the length direction of the positioning groove is the direction in which the axial end face 4 needs to be inclined during installation, and the two ends of the positioning groove in the length direction are connected, and the two ends in the width direction form positioning side faces 5. The positioning side faces 5 can be a plane or a curved surface. When the positioning side faces 5 are curved surfaces, the positioning side faces 5 may have a certain slope with the axial end face 4. When the positioning side faces 5 are planes, the positioning side faces 5 can be perpendicular to the axial end face 4 for easy processing.

[0041] The eccentric sleeve 1 can adopt the following structure: Figure 2 and Figure 3 As shown, it includes a first shaft segment 6 and a second shaft segment 7 connected axially, the diameter of the first shaft segment 6 is larger than the diameter of the second shaft segment 7, the opening 102 and the first bevel end 104 are located at one end of the first shaft segment 6, the plane end 103 is located at the other end of the first shaft segment 6, and the positioning structure 106 and the second bevel end 105 are located at the end of the second shaft segment 7. The shaft hole 101 extends from the first shaft segment 6 to the second shaft segment 7, but does not penetrate the second shaft segment 7. The first shaft segment 6 and the second shaft segment 7 can be made separately and then welded and fixed, or can be integrally formed.

[0042] The positioning structure 106 added to the eccentric sleeve 1 will have a certain impact on the structural strength of the eccentric sleeve 1 and the installation position of the eccentric sleeve 1 in the diaphragm pump. In order to ensure the structural strength of the eccentric sleeve 1 while avoiding installation interference, when the positioning structure 106 is in a straight line structure, the width of the positioning structure 106 is 20%-40% of the outer diameter of the second shaft segment 7; the depth of the positioning structure 106 is 40%-60% of the axial length of the second shaft segment 7.

[0043] Embodiment 3

[0044] An eccentric sleeve assembly 15, such as Figure 5 and Figure 6 As shown, it includes a thrust ring 8, a gasket 9, a bearing 10, a diaphragm seat 11 and the eccentric sleeve 1 mentioned above, the bearing 10 is axially limited between the diaphragm seat 11 and the flat end 103, the inner bracket of the bearing 10 is connected to the outer peripheral surface of the eccentric sleeve 1, the outer bracket of the bearing 10 is connected to the diaphragm seat 11, and the thrust ring 8, gasket 9, bearing 10 and diaphragm seat 11 are axially connected and fixed in sequence. Figure 6 As shown, the diaphragm seat 11 is provided with a screw hole, and the fastening screw 12 passes through the thrust ring 8 and is fixed to the diaphragm seat 11. The gasket 9 is pressed on the end of the outer bracket of the bearing 10, and the thrust ring 8 presses the gasket 9. The diaphragm seat 11 is annular, so that the positioning groove of the eccentric sleeve 1 is exposed. When the crimping method with the motor shaft on top is used, the installation fixture 2 can pass through the center of the diaphragm seat 11 and cooperate with the positioning groove.

[0045] like Figure 4 As shown, the mounting fixture 2 is divided into a carrier 13 located at the top and a base 14 located at the bottom. The carrier 13 is used to place the eccentric sleeve assembly 15. The first inclined surface end 104 is horizontal through the cooperation of the limiting portion 201 on the carrier 13 and the positioning structure 106. The base 14 can be fixed normally. The carrier 13 can be designed according to the structure of the eccentric sleeve 1. When the size and model of the eccentric sleeve 1 changes, it is sufficient to replace the carrier 13 accordingly.

[0046] In the description of the present invention, it should be understood that the terms "center", "up", "down", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0048] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0049] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An eccentric sleeve, characterized in that: The eccentric sleeve (1) has an axial hole (101) inside, and the axial hole (101) extends to one axial end of the eccentric sleeve (1) to form an opening (102). The eccentric sleeve (1) has a radially protruding shoulder on the outside, and the end of the shoulder away from the opening (102) is a plane end (103). The end of the eccentric sleeve (1) where the opening (102) is located is a first bevel end (104), and the end of the eccentric sleeve (1) facing away from the opening (102) is a second bevel end (105). The first bevel end (104) is parallel to the second bevel end (105), and the first bevel end (104) is not parallel to the plane where the plane end (103) is located and is arranged perpendicular to the axial hole (101).

2. The eccentric sleeve according to claim 1, characterized in that: The outer end surface of the bearing (10) of the eccentric sleeve assembly is aligned with the lowest point or the highest point of the second bevel end (105) or is located between the lowest point and the highest point of the second bevel end (105).

3. The eccentric sleeve according to claim 1 or 2, characterized in that: The end surface of the eccentric sleeve (1) where the second bevel end (105) is located is provided with a positioning structure (106) capable of cooperating with an external mounting fixture (2) to keep the shaft hole (101) vertical.

4. The eccentric sleeve according to claim 3, characterized in that: The positioning structure (106) has an axial end surface (4) and a positioning side surface (5), and the axial section where the highest point and the lowest point of the first bevel end (104) are located is the first plane (3). The axial end surface (4) and / or the positioning side surface (5) can rotate the first bevel end (104) around the normal of the first plane (3) to a horizontal state.

5. The eccentric sleeve according to claim 4, characterized in that: The axial end surface (4) is parallel to the plane end (103).

6. The eccentric sleeve according to claim 3, characterized in that: The positioning structure (106) is a positioning groove recessed inwardly from the end surface of the eccentric sleeve (1) or a positioning protrusion protruding from the end surface of the eccentric sleeve (1).

7. The eccentric sleeve according to claim 6, characterized in that: The eccentric sleeve (1) comprises a first shaft section (6) and a second shaft section (7) which are axially connected, the diameter of the first shaft section (6) being larger than the diameter of the second shaft section (7), the opening (102) and the first bevel end (104) being located at one end of the first shaft section (6), the plane end (103) being located at the other end of the first shaft section (6), and the positioning structure (106) and the second bevel end (105) being located at the end of the second shaft section (7).

8. The eccentric sleeve according to claim 6, characterized in that: The cross section of the positioning groove or positioning protrusion is in the shape of a straight line.

9. The eccentric sleeve according to claim 8, characterized in that: The width of the positioning structure (106) is 20%-40% of the outer diameter of the second shaft segment (7); the depth of the positioning structure (106) is 40%-60% of the axial length of the second shaft segment (7).

10. An eccentric sleeve assembly, characterized in that: It comprises a thrust ring (8), a gasket (9), a bearing (10), a diaphragm seat (11), and an eccentric sleeve (1) as claimed in any one of claims 1 to 8, wherein the bearing (10) is axially limited between the diaphragm seat (11) and the plane end (103), the inner bracket of the bearing (10) is connected to the outer peripheral surface of the eccentric sleeve (1), the outer bracket of the bearing (10) is connected to the diaphragm seat (11), and the thrust ring (8), the gasket (9), the bearing (10) and the diaphragm seat (11) are axially connected and fixed in sequence.

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