Diaphragm pump eccentric wheel motor assembly and diaphragm pump

Abstract

The utility model discloses a diaphragm pump eccentric wheel motor assembly which comprises a motor and an eccentric wheel, the motor is provided with a front bearing capable of bearing axial force, the front bearing is arranged in a front bearing seat of the motor, a bearing outer ring of the front bearing is axially fixed, and a receding hole is formed in the side, close to the eccentric wheel, of the front bearing seat. A protruding supporting part is arranged at the bottom of the eccentric wheel, penetrates through the receding hole and abuts against an inner ring of a front bearing of the motor through the supporting face, and the supporting part does not make contact with an outer ring of the front bearing. In addition, the position of the eccentric wheel in the axial direction does not need to be fixed through friction force between the eccentric wheel and the motor shaft, the magnitude of interference on the eccentric wheel and the motor shaft can be reduced, and therefore the press-fitting force during press-fitting of the eccentric wheel is reduced, and the possibility that the bearing is damaged in the process is reduced. And the bearing life is prolonged.

Description

Technical Field

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

[0002] In the prior art, the power generated by the motor of a micro diaphragm pump is generally transmitted to a rubber airbag through an eccentric wheel, a steel needle and a support frame. During installation and operation, due to the elastic force of the rubber airbag, the eccentric wheel always bears an axial force.

[0003] Since a conventional motor tries to reduce the gap between the end cover and the shaft to reduce foreign object intrusion and improve the bearing life, the bottom of a conventional eccentric wheel is also a plane larger than the bearing. If the eccentric wheel is pressed against the motor end cover, the eccentric wheel will be damaged. Therefore, there is a certain distance left between the eccentric wheel and the motor in the existing design.

[0004] The existing eccentric wheels of micro diaphragm pumps are all fixed on the motor shaft by press-fitting. The specific installation operation is as follows: after installing the base of the pump body on the motor, the press-fitting position of the eccentric wheel is controlled by controlling the distance between the eccentric wheel press-fitting positioning surface of the base and the top plane of the eccentric wheel.

[0005] The bearings of the motor shaft of the diaphragm pump adopt rolling bearings or sliding bearings. Since the inner rings of the existing diaphragm pump bearings are basically not axially fixed, the bearings basically do not bear axial force, and the axial force is transmitted to the motor rear cover through the motor shaft and supported by the motor rear cover. After long-term operation, serious wear of the motor rear cover will cause the motor shaft to sink, affecting the performance of the diaphragm pump and further affecting the service life of the diaphragm pump.

[0006] Some manufacturers limit the relative position between the bearing and the shaft by using glue or adding a shaft sleeve to enable the bearing to bear axial force. However, because a large interference fit is required to ensure the relative position between the eccentric wheel and the shaft, the press-fitting force of the eccentric wheel is large. The glue or adding a shaft sleeve solution will cause damage to the rolling bearing during the press-fitting process, shortening the service life of the rolling bearing itself, and it will also heat up and melt the eccentric wheel after severe wear, and the effect of life improvement is also limited. Summary of the Utility Model

[0007] The purpose of the utility model is to provide an eccentric wheel motor assembly to enable the bearing to bear axial load.

[0008] The utility model provides a diaphragm pump eccentric wheel motor assembly, which includes a motor and an eccentric wheel. The motor has a front bearing capable of withstanding axial force. The front bearing is arranged in the front bearing seat of the motor, and the outer ring of the front bearing is axially fixed. A relief hole is provided on one side of the front bearing seat close to the eccentric wheel. The bottom of the eccentric wheel has a protruding support portion. The support portion passes through the relief hole and abuts against the inner ring of the front bearing of the motor through a support surface, and the support portion does not contact the outer ring of the front bearing.

[0009] Optionally, the front bearing is a deep groove ball bearing, the support surface is circular, the diameter of the support surface is smaller than the inner diameter of the outer ring of the front bearing, the diameter of the support surface is larger than the outer diameter of the inner ring of the front bearing, and the support portion does not contact the front end cover of the motor.

[0010] Optionally, the opening of the front bearing seat faces away from the eccentric wheel; the front end cover of the motor is integrally formed with the housing.

[0011] Optionally, the relative position between the outer ring of the front bearing and the inner cylindrical surface of the front bearing seat is fixed by interference fit.

[0012] Optionally, the eccentric wheel and the motor shaft are in interference fit, and one end of the motor shaft away from the eccentric wheel abuts against the rear cover of the motor.

[0013] Optionally, the rear cover includes a wear-resistant plate, and contacts the motor shaft through the wear-resistant plate.

[0014] Optionally, the material of the wear-resistant plate is PE EK or graphite nylon; the material of the eccentric wheel is plastic.

[0015] Optionally, a base is located between the motor and the eccentric wheel. A motor through hole is provided on the base. The motor shaft of the motor passes through the motor through hole of the base. The base is installed on the motor, and the outer cylindrical surface of the front bearing seat has a clearance fit with the motor through hole of the base.

[0016] The utility model also provides a diaphragm pump including the above-mentioned diaphragm pump eccentric wheel motor assembly.

[0017] Specifically, the diaphragm pump further includes a diaphragm airbag, a support frame and a steel needle. A central hole and an eccentric hole are provided on the eccentric wheel. The motor shaft is inserted into the central hole. One end of the steel needle is inserted into the eccentric hole, and the other end of the steel needle is fixed to the support frame, and the diaphragm airbag is driven through the support frame.

[0018] The beneficial effects of the utility model are:

[0019] By providing a support portion at the bottom of the eccentric wheel and forming a relief hole on the motor, the support portion of the eccentric wheel directly abuts against the inner ring of the motor bearing, enabling the bearing to bear axial load. Moreover, since there is no need to rely on the frictional force between the eccentric wheel and the motor shaft to fix the axial position of the eccentric wheel, the interference amount between the eccentric wheel and the motor shaft can be reduced, thereby reducing the press-fitting force when the eccentric wheel is press-fitted and decreasing the possibility of damage to the bearing during the process, and further improving the bearing life. Compared with the solutions of using glue and adding bushings, the number of processes can be reduced and the cost can be lowered. Brief Description of the Drawings

[0020] Figure 1 Schematic cross-sectional structure diagram of an eccentric wheel motor assembly of a diaphragm pump provided by the present utility model

[0021] Figure 2 Schematic structure diagram of the eccentric wheel of an eccentric wheel motor assembly of a diaphragm pump provided by the present utility model

[0022] Figure 3 Partial cross-sectional structure diagram of the motor of an eccentric wheel motor assembly of a diaphragm pump provided by the present utility model

[0023] Reference Numeral Description

[0024] 1. Motor; 11. Motor shaft; 12. Front bearing; 13. Front bearing seat; 14. Rear cover; 141. Wear-resistant plate; 2. Eccentric wheel; 21. Support portion; 211. Support surface; 3. Base; 4. Diaphragm airbag; 5. Support frame; 6. Steel needle; Detailed Embodiment

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0029] The present utility model provides a diaphragm pump eccentric wheel motor assembly, which includes a motor 1 and an eccentric wheel 2. The motor 1 has a front bearing 12 that can bear axial force. The front bearing 12 is arranged in the front bearing seat 13 of the motor 1, and the outer ring of the front bearing 12 is axially fixed. A relief hole is provided on one side of the front bearing seat 13 close to the eccentric wheel 2. The bottom of the eccentric wheel 2 has a protruding support portion 21. The support portion 21 passes through the relief hole and abuts against the inner ring of the front bearing 12 of the motor 1 through the support surface 211, and the support portion 21 does not contact the outer ring of the front bearing 12.

[0030] As an optional implementation manner, the front bearing 12 is a deep groove ball bearing.

[0031] As another optional implementation manner, the front bearing 12 is an angular contact ball bearing.

[0032] As an optional implementation manner, the support surface 211 is circular, the diameter of the support surface 211 is smaller than the inner diameter of the outer ring of the front bearing 12, the diameter of the support surface 211 is larger than the outer diameter of the inner ring of the front bearing 12, and the support portion 21 does not contact the front end cover of the motor 1.

[0033] As another optional implementation manner, the support surface 211 is a regular polygon, the circumscribed circle diameter of the support surface 211 is smaller than the inner diameter of the outer ring of the front bearing 12, the circumscribed circle diameter of the support surface 211 is larger than the outer diameter of the inner ring of the front bearing 12, and the support portion 21 does not contact the front end cover of the motor 1.

[0034] As an optional implementation manner, the opening of the front bearing seat 13 faces away from the eccentric wheel 2; as another optional implementation manner, the opening of the front bearing seat 13 faces away from the side where the stator and rotor of the motor 1 are arranged.

[0035] As an optional implementation manner, the front end cover of the motor 1 is integrally formed with the housing.

[0036] As an alternative embodiment, the outer ring of the front bearing 12 is fixed in relative position with the inner cylindrical surface of the front bearing housing 13 by interference fit.

[0037] As another alternative embodiment, the outer ring of the front bearing 12 is fixed to the bearing housing 13 by a bearing cover plate.

[0038] As an alternative embodiment, the front bearing housing 13 has a steel sleeve, and the outer ring of the front bearing 12 is fitted with the steel sleeve.

[0039] As another alternative embodiment, the front bearing housing 13 has a copper sleeve, and the outer ring of the front bearing 12 is fitted with the copper sleeve.

[0040] As an alternative embodiment, the eccentric wheel 2 and the motor shaft 11 are in interference fit, and one end of the motor shaft 11 away from the eccentric wheel 2 abuts against the rear cover 14 of the motor 1.

[0041] At the same time, the axial force is jointly borne by the front bearing 12 and the rear cover 14, which can slow down the wear of the bearing and the rear cover 14, reduce the heat generation of the bearing and the rear cover 14, and improve the service life of the motor 1.

[0042] As an alternative embodiment, the rear cover 14 includes a wear-resistant plate 141, and the wear-resistant plate 141 contacts the motor shaft 11.

[0043] As an alternative embodiment, the material of the wear-resistant plate 141 is PEEK or graphite nylon.

[0044] As an alternative embodiment, the material of the eccentric wheel 2 is plastic.

[0045] Specifically, the material of the eccentric wheel is PA6T.

[0046] As an alternative embodiment, the base 3 is located between the motor 1 and the eccentric wheel 2. A motor through-hole is provided on the base 3, the motor shaft 11 of the motor 1 passes through the motor through-hole of the base 3, the base 3 is mounted on the motor 1, and the outer cylindrical surface of the front bearing housing 13 is in clearance fit with the motor through-hole of the base 3.

[0047] The present utility model further provides a diaphragm pump including the above-described embodiment. In addition, the diaphragm pump further includes a diaphragm airbag 4, a support frame 5, and a steel needle 6. A central hole and an eccentric hole are provided on the eccentric wheel 2. The motor shaft 11 is inserted into the central hole, one end of the steel needle 6 is inserted into the eccentric hole, and the other end of the steel needle 6 is fixed to the support frame 5, and the diaphragm airbag 4 is driven by the support frame 5.

[0048] Those skilled in the art should understand that the diaphragm airbag 4 can be used not only for gas media but also for liquid media.

[0049] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A diaphragm pump eccentric motor assembly, characterized in that: The invention comprises a motor (1) and an eccentric wheel (2), wherein the motor (1) has a front bearing (12) capable of bearing axial force, the front bearing (12) being arranged in a front bearing seat (13) of the motor (1), and the outer ring of the bearing of the front bearing (12) being axially fixed; a clearance hole is provided on a side of the front bearing seat (13) close to the eccentric wheel (2); the bottom of the eccentric wheel (2) has a protruding support portion (21), the support portion (21) passes through the clearance hole and abuts against the inner ring of the front bearing (12) of the motor (1) through a support surface (211), and the support portion (21) does not contact the outer ring of the front bearing (12).

2. A diaphragm pump eccentric motor assembly as claimed in claim 1, characterized in that: The front bearing (12) is a deep groove ball bearing, the support surface (211) is circular, the diameter of the support surface (211) is smaller than the inner diameter of the outer ring of the front bearing (12), the diameter of the support surface (211) is larger than the outer diameter of the inner ring of the front bearing (12), and the support portion (21) does not contact the front end cover of the motor (1).

3. A diaphragm pump eccentric motor assembly as claimed in claim 1, characterized in that: The opening of the front bearing seat (13) faces the side away from the eccentric wheel (2); the front end cover of the motor (1) is integrally formed with the casing.

4. A diaphragm pump eccentric motor assembly as claimed in claim 1, characterized in that: The outer ring of the front bearing (12) is fixed in relative position with the inner cylindrical surface of the front bearing seat (13) by means of interference fit.

5. A diaphragm pump eccentric motor assembly as claimed in claim 1, characterized in that: The eccentric wheel (2) and the motor shaft (11) are interference-fitted, and one end of the motor shaft (11) away from the eccentric wheel (2) abuts against the rear cover (14) of the motor (1).

6. A diaphragm pump eccentric motor assembly as claimed in claim 5, characterized in that: The rear cover (14) comprises a wear-resistant plate (141) and is in contact with the motor shaft (11) via the wear-resistant plate (141).

7. A diaphragm pump eccentric motor assembly as claimed in claim 6, characterized in that: The wear-resistant plate (141) is made of PEEK or graphite nylon; the eccentric wheel (2) is made of plastic.

8. A diaphragm pump eccentric motor assembly as claimed in claim 1, characterized in that: The base (3) is located between the motor (1) and the eccentric wheel (2), and a motor through hole is opened on the base (3). The motor shaft (11) of the motor (1) passes through the motor through hole of the base (3). The base (3) is installed on the motor (1), and the outer cylindrical surface of the front bearing seat (13) is clearance-matched with the motor through hole of the base (3).

9. A diaphragm pump, characterized in that: The invention comprises a diaphragm pump eccentric motor assembly as claimed in any one of claims 1 to 8.

10. A diaphragm pump according to claim 9, characterized in that: It also includes a diaphragm airbag (4), a support frame (5) and a steel needle (6); the eccentric wheel (2) is provided with a center hole and an eccentric hole; the motor shaft (11) is inserted into the center hole; one end of the steel needle (6) is inserted into the eccentric hole; the other end of the steel needle (6) is fixed to the support frame (5); and the diaphragm airbag (4) is driven by the support frame (5).

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