CN210106519U

CN210106519U - Motor gear for valve electric actuator

Info

Publication number: CN210106519U
Application number: CN201920602543.9U
Authority: CN
Inventors: 庞鸿飞; 赵冶; 申朝朝
Original assignee: TIANJIN TURK ACTUATORS Co Ltd
Current assignee: TIANJIN TURK ACTUATORS Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-02-21
Anticipated expiration: 2029-04-29

Abstract

The utility model discloses a motor gear for valve electric actuator, including outer metal gear and insulating isolator, the insulating isolator is connected in the inside of outer metal gear, be equipped with the centre bore on the insulating isolator, the centre bore is with the axle center with outer metal gear. The utility model discloses a set up insulating isolator between motor shaft and outer metal gear, make the holistic withstand voltage of executor reach the standard and be greater than or equal to 2Ui +1000V, simple structure is reliable, has prolonged life.

Description

Motor gear for valve electric actuator

Technical Field

The utility model belongs to the technical field of the gear, in particular to a motor gear for valve electric actuator.

Background

The direct current motor comprises a brush direct current motor and a direct current brushless motor, and is small in size and high in efficiency, so that the direct current motor is more and more widely applied to the field of valve electric actuators (hereinafter referred to as actuators).

The common working voltage of the direct current motor is less than DC60V, and the direct current motor mainly comprises DC24V, DC12V, DC5V and the like. According to the standard of JBT 8528 common valve electric device, the insulation withstand voltage between the motor shell and the coil or between the built-in driving plate and the shell is more than or equal to 500V, namely the standard is met, and the withstand voltage standard is also achieved by the motor.

The common structure of the actuator is a direct current motor, a speed reducer and a control board, wherein the control board is divided into a high-voltage part (the voltage is more than 60V) and a low-voltage part (the voltage is less than 60V), and the metal parts of the common actuator mainly comprise a motor gear, a speed reducer, an output shaft, a shell or a base and the like.

Common working voltages of the actuator are AC95-265V, AC/DC24V and DC 12V.

The structure of the actuator is easy to achieve the standard of withstand voltage for the operating voltage of the actuator < DC 60V.

However, in the actuator which is used in large quantities daily, the working voltage is mostly in the range of AC95-265V, according to the insulation withstand voltage standard, the integral withstand voltage requirement of the product is more than or equal to 2Ui +1000V, the withstand voltage of the metal part of the actuator and the high-voltage part of the control board is required to reach 2Ui +1000V, the withstand voltage of the metal part of the actuator and the low-voltage part of the control board is required to reach 2Ui +1000V, and the high-voltage part and the low-voltage part are controlled to reach 2Ui + 1000V.

The high-voltage part and the low-voltage part of the control board are very easy to realize the insulation and voltage resistance of 2Ui +1000V from the technical angle, and the metal part of the actuator and the high-voltage part of the control board are also easy to realize the insulation and voltage resistance of 2Ui + 1000V.

How the pressure resistance between the metal part of the actuator and the low-pressure part of the control plate meets the pressure resistance requirement:

firstly, the insulation voltage resistance of the motor refers to the insulation voltage resistance between a metal part and a coil of the motor, 500V is very easy to achieve in the prior art, and the coil of the motor is connected with a low-voltage driving electric appliance of a control board. The metal part of the motor and the low voltage part of the control board have only a dielectric strength of 500V. In order to meet the requirement that the withstand voltage of an actuator metal part and a low-voltage part of a control board is 2Ui +1000V, the motor metal part and the actuator metal part must be insulated and isolated, and the motor and the actuator metal part are connected through a non-conductive insulating support, so that the electrical isolation of a motor shell and the actuator metal part is realized.

For the isolation of the motor shaft from the metal part of the actuator, the following methods can be adopted:

1. the motor gear is a plastic gear, so that a motor shaft is isolated from the metal transmission gear, and simultaneously, the motor shaft is isolated from the metal part of the actuator in an insulating way, thereby meeting the integral insulating and voltage-withstanding requirement.

2. The motor gear adopts a metal gear, the gear meshed with the metal gear adopts a plastic gear, and meanwhile, the motor gear and the metal part of the actuator are insulated and isolated, so that the requirement of integral insulation and voltage resistance is met.

The two methods adopt plastic gears, and can be used in the occasions with low motor torque, but under the condition of larger motor torque, the plastic gears have the defects of low strength, poor wear resistance and the like, so that the plastic gears cannot meet the service life of an actuator under larger load, only the gears made of metal materials can be used, and the whole pressure resistance of the product cannot meet the standard requirement between the metal gears.

In addition, although there is a method for improving the dielectric strength of the motor, namely, the voltage of the motor reaches 2Ui +1000V, the cost is very high even if the dielectric strength can be satisfied due to the structure of the direct current motor, and thus the necessity of using the motor in the field of valve electric actuators is lost.

Therefore, if the withstand voltage between the motor gear and the motor shaft can be solved, the above-mentioned problem can be perfectly solved.

SUMMERY OF THE UTILITY MODEL

To the technical problem who exists among the prior art, the utility model provides a motor gear for valve electric actuator has satisfied the withstand voltage standard requirement that reaches of whole insulation of executor.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the utility model provides a motor gear for valve electric actuator, includes outer metal gear and insulating isolator, the insulating isolator is connected inside outer metal gear, be equipped with the centre bore on the insulating isolator, the centre bore is with the axle center with outer metal gear.

Preferably, the insulating insulator is fixedly connected with the outer metal gear.

Preferably, the insulating separator is made of a non-conductive non-metallic material and can be obtained by injection molding and machining.

Preferably, the insulation isolator is an injection molding piece, and the insulation isolator is fixedly connected with the outer metal gear through injection molding.

Preferably, the insulating insulator is fixedly connected with the outer metal gear through bonding.

Preferably, the insulating insulator is fixedly connected with the outer metal gear through extrusion wedging.

Preferably, the insulation isolator is fixedly connected with the outer metal gear through one, two or three of injection molding, bonding or extrusion wedging.

Preferably, the cross-sectional shape of the central hole of the insulating spacer is circular or non-circular.

Preferably, the non-circular central hole of the insulating spacer has a cross-sectional shape of D-shape, knurled shape, or polygonal shape.

Preferably, one or more concave-convex structures are arranged between the outer wall of the insulating isolation body and the inner wall of the outer metal gear, so that the reliable fixed connection between the insulating isolation body and the metal gear is ensured.

Preferably, the insulating insulator is coupled with the outer metal gear by a key or teeth.

Preferably, the insulation insulator is connected to the outer metal gear by a key or a tooth by machining a concave-convex groove on the inner and outer surfaces of the insulation insulator and wedging the inner and outer metal gears in correspondence to the inner surface of the outer metal gear.

Compared with the prior art, the utility model discloses the beneficial effect who has is: the utility model discloses a set up insulating isolator between motor shaft and outer metal gear, make the holistic withstand voltage of executor reach the standard and be greater than or equal to 2Ui +1000V, simple structure is reliable, has prolonged life.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art actuator;

fig. 2 is a schematic top view of an outer metal gear of a motor gear for an electric actuator of a valve according to the present invention;

fig. 3 is a schematic cross-sectional structural view of an outer metal gear of a motor gear for an electric actuator of a valve according to the present invention;

fig. 4 is a schematic top view of an insulating spacer for a motor gear of an electric actuator of a valve according to the present invention;

fig. 5 is a schematic cross-sectional view of an insulating spacer for a motor gear of an electric actuator of a valve according to the present invention;

fig. 6 is a schematic view of an assembled cross-sectional structure of a motor gear for an electric actuator of a valve according to the present invention;

fig. 7 is a schematic structural view of a D-shaped central hole of an insulation spacer for a motor gear of an electric actuator of a valve according to the present invention;

fig. 8 is a schematic structural view of a knurled central hole of an insulation isolator for a motor gear of an electric actuator of a valve according to the present invention;

fig. 9 is a schematic structural view of a polygonal center hole of an insulation spacer for a motor gear of an electric actuator of a valve according to the present invention.

In the figure, 1. a mechanical operation part; 2. a drive plate; 3. an upper gear; 4. a lower gear; 5. a motor shaft; 6. a motor gear; 61. an outer metal gear; 62. a groove; 63. an insulating spacer; 64. a protrusion; 7. a control main board; 71. low pressure part; 72. a high pressure section; 8. and a speed reducer.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2 to 6, the embodiment of the present invention discloses a motor gear for a valve electric actuator, which includes an outer metal gear 61 and an insulating spacer 63, wherein the insulating spacer 63 is connected inside the outer metal gear 61, and the insulating spacer 63 is provided with a central hole, and the central hole is coaxial with the outer metal gear 61. The insulation withstand voltage standard between the outer metal gear 61 and the motor shaft 5 is achieved by the insulating action of the insulator-spacer 63.

In this embodiment, the insulating spacer 63 is fixedly connected to the outer metal gear 61.

In this embodiment, the insulating spacer 63 is made of a non-conductive non-metallic material, and can be obtained by injection molding and machining. The insulating isolation body 63 is an injection molding piece, and the insulating isolation body 63 and the outer metal gear 61 are fixedly connected through injection molding. The insulating spacer 63 may be fixedly connected to the outer metal gear 61 by adhesion, or fixedly connected to the outer metal gear 61 by extrusion wedging, or the insulating spacer 63 may be fixedly connected to the outer metal gear 61 by one, two or three of injection molding, adhesion or extrusion wedging.

In the present embodiment, the cross-sectional shape of the central hole of the insulating spacer 63 is circular or non-circular, for example, the cross-sectional shape of the non-circular central hole of the insulating spacer 63 is D-shaped, knurled or polygonal, see fig. 7, 8 and 9 in particular.

In this embodiment, as shown in fig. 2 to 5, in order to prevent the relative sliding between the outer metal gear 61 and the insulating spacer 63, one or more concave-convex structures are provided between the outer wall of the insulating spacer 63 and the inner wall of the outer metal gear 61, so as to ensure the reliable fixed connection between the insulating spacer 63 and the outer metal gear 61. For example, two ends of the inner wall of the outer metal gear 61 are respectively provided with a groove 62, two ends of the outer wall of the insulating spacer 63 are respectively provided with a protrusion 64 which is mutually matched and inserted with the groove 62, and the protrusion 64 is clamped in the groove 62, so that the relative sliding between the outer metal gear 61 and the insulating spacer 63 can be further prevented. Of course, it is also possible to provide a protrusion 64 at each end of the inner wall of the outer metal gear 61, and a groove 62 (not shown) for inserting the protrusion 64 into each end of the outer wall of the insulating spacer 63.

In the present embodiment, the insulating spacer 63 and the outer metal gear 61 are connected by a key or tooth (not shown in the drawings, and may be a known spline connection) by machining a concave-convex groove on the inner and outer surfaces of the insulating spacer 63 and wedging the inner and outer metal gears 61 into a wedge shape corresponding to the inner surface of the outer metal gear 61.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.

Claims

1. The utility model provides a motor gear for valve electric actuator which characterized in that, includes outer metal gear and insulating isolator, the insulating isolator is connected in the inside of outer metal gear, be equipped with the centre bore on the insulating isolator, the centre bore is with the axle center with outer metal gear.

2. The motor gear for the electric actuator of the valve as claimed in claim 1, wherein the insulating insulator is fixedly connected with the outer metal gear.

3. The motor gear for the electric actuator of the valve as claimed in claim 1 or 2, wherein the insulating isolator is made of a non-conductive non-metallic material and can be obtained by injection molding and machining.

4. The motor gear for the electric actuator of the valve according to claim 3, wherein the insulating isolator is an injection molding piece, and the insulating isolator is fixedly connected with the outer metal gear through injection molding.

5. The motor gear for the electric actuator of the valve as claimed in claim 3, wherein the insulating insulator is fixedly connected with the outer metal gear by bonding.

6. The motor gear for the electric actuator of the valve as claimed in claim 3, wherein the insulating spacer is fixedly connected with the outer metal gear by means of compression wedging.

7. The motor gear for the electric actuator of the valve according to claim 3, wherein the insulating isolator is fixedly connected with the outer metal gear by one, two or three of injection molding, bonding or extrusion wedging.

8. The motor gear for an electric actuator of a valve as claimed in claim 1, wherein the cross-sectional shape of the central hole of the insulating spacer is circular or non-circular.

9. The motor gear for the electric actuator of the valve as claimed in claim 8, wherein the non-circular central hole of the insulating isolator has a cross-sectional shape of D-shape, knurled shape or polygonal shape.

10. The motor gear for the electric actuator of the valve as claimed in claim 1, wherein one or more concave-convex structures are arranged between the outer wall of the insulating isolation body and the inner wall of the outer metal gear to ensure the reliable fixed connection between the insulating isolation body and the outer metal gear.

11. The motor gear for the electric actuator of the valve as claimed in claim 1, wherein the insulating insulator is coupled with the outer metal gear by a key or teeth.

12. The motor gear for the electric actuator of the valve as claimed in claim 11, wherein the insulating insulator is coupled with the outer metal gear by means of a key or teeth by processing a concave-convex groove on the inner and outer surfaces of the insulating insulator and wedging the concave-convex groove and the inner surface of the outer metal gear correspondingly.