Electric valve actuator

Abstract

The utility model discloses an electric valve actuator, which is characterized in that a main shell and a base of a motor are integrally formed and are not independently manufactured any more, the motor can be formed only by arranging a rotor, a stator and other components into the main shell and arranging a cover, and the main shell and the base do not need to be independently assembled. The assembly error caused by the fact that the main shell and the base need to be assembled in the prior art is eliminated, meanwhile, the main shell and the base are integrally formed and can be designed and manufactured in a unified mode, the error caused by independent design and manufacturing of one of the main shell and the base is eliminated, and on the basis, the parallelism between the output shaft of the motor and the wheel shaft of the gear set can be greatly improved; therefore, the driving resistance of the motor is reduced, and the phenomenon that the output shaft of the motor is stuck is avoided. In addition, as the main shell and the base are of an integrally formed structure, the bonding strength of the motor and the base can be improved, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valve control, in particular to an electric actuator for a valve. Background Art

[0002] An electric valve actuator is a control mechanism that uses electricity as its main energy source and is used to drive the valve to open and close. Existing electric valve actuators mainly include a housing and an actuator disposed in the housing. The actuator generally includes a base, a motor mounted on the base, a gear set, a control circuit board, and a rotating shaft. The base is generally made of metal (such as aluminum alloy). The motor forms a transmission connection with the rotating shaft through a gear set, so that the motor drives the rotating shaft to rotate through the gear set so that the rotating shaft drives the pivot shaft of the valve to rotate, thereby controlling the opening and closing of the valve.

[0003] Although the existing electric valve actuators can meet the basic requirements of use, they still have some shortcomings. For example, the motor is manufactured separately from the base, and then the motor casing is fixed to the base by screws. Due to the combined influence of the design errors and processing errors of the base and the motor and the assembly errors of the two, after assembly, there will be a large error in the parallelism between the motor output shaft (generally the rotor shaft of the motor) and the wheel axle of the gear set, which can easily increase the driving resistance of the motor and easily cause the output shaft of the motor to get stuck, which is not conducive to the smooth operation of the electric valve actuator. In addition, the motor and the base connected by screws have weak structural strength and high manufacturing cost. Utility Model Content

[0004] The main purpose of the utility model is to provide an electric valve actuator, aiming to ensure the running stability of the electric valve actuator, while improving the structural strength and reducing the manufacturing cost.

[0005] To achieve the above-mentioned purpose, the utility model proposes an electric valve actuator, including a shell and an actuator installed inside the shell, the actuator including a base and a motor, a gear set and a rotating shaft arranged on the base, the motor has an outer shell, the outer shell includes a main shell and a cover body, and the main shell and the base are integrally formed.

[0006] The technical solution of the utility model forms the main shell and the base of the motor in one piece, and no longer needs to be manufactured separately. It only needs to install the rotor, stator and other components into the main shell and install the cover to form the motor, and there is no need to assemble the main shell and the base separately, eliminating the assembly error caused by the prior art that requires the main shell and the base to be assembled. At the same time, the main shell and the base are formed in one piece, and can be designed and manufactured in a unified manner, eliminating the error of one party being designed and manufactured separately. Based on this, the application can greatly improve the parallelism between the output shaft of the motor and the axle of the gear set, thereby reducing the driving resistance of the motor and avoiding the phenomenon of the output shaft of the motor being stuck. In addition, since the main shell and the base are an integrated structure, the bonding strength between the motor and the base can be improved and the manufacturing cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0008] Figure 2 It is an exploded schematic diagram of the utility model;

[0009] Figure 3 It is a partial exploded schematic diagram of the base and the motor of the utility model;

[0010] Figure 4 Schematic diagram of the base plate and the main shell. DETAILED DESCRIPTION

[0011] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0012] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0013] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0014] The utility model provides an electric valve actuator.

[0015] In the embodiment of the utility model, Figures 1 to 4 As shown, the electric valve actuator includes a housing 1 and an actuator installed inside the housing 1, wherein the actuator includes a base 2 and components such as a motor 3, a gear set 5 and a rotating shaft 4 installed on the base 2. Specifically, the base 2 can be made of high-strength materials such as aluminum alloy, cast iron or stainless steel to ensure structural strength, preferably aluminum alloy. The motor 3 has a shell 31, and components such as a rotor 32 and a stator 33 installed in the shell 31. The shell 31 includes a main shell 311 and a cover body 312. The main shell 311 and the base 2 are integrally formed. The upper end of the main shell 311 is open, and the cover body 312 covers the upper end of the main shell 311 and closes the upper end of the main shell 311, and together with the main shell 311, it forms a storage space for accommodating components such as the stator 33 and the rotor 32. The base 2 is located in the area of ​​the main shell 311. The area is provided with a pivot hole 21 for the output shaft of the rotor 32 (that is, the output shaft of the motor, not shown) to pass through. After passing through the pivot hole, the output shaft forms a transmission match with the rotating shaft 4 through the gear set 5. When the shaft rotates, the rotating shaft 4 is driven to rotate through the gear set 5 to control the opening and closing of the valve (not shown). The electric valve actuator of the utility model forms the main housing 311 of the motor and the base 2 in one piece, and no longer needs to be manufactured separately. It only needs to install the rotor 32, stator 33 and other components into the main housing 311 and install the cover body to form the motor, and there is no need to assemble the main housing 311 and the base 2 separately, eliminating the assembly error caused by the prior art that requires the main housing 311 and the base 2 to be assembled. At the same time, the main housing 311 and the base 2 are formed in one piece, and can be uniformly designed and manufactured, eliminating the error of one party being designed and manufactured separately. Based on this, the application can greatly improve the parallelism between the output shaft of the motor and the wheel axle of the gear set 5, thereby reducing the driving resistance of the motor 3 and avoiding the phenomenon that the output shaft of the motor 3 is stuck. In addition, since the main housing and the base 2 are an integrated structure, the bonding strength between the motor and the base 2 can be improved and the manufacturing cost can be reduced.

[0016] Specifically, a circular enclosure extends integrally from the surface of the base 2, and the enclosure and the base 2 form the main shell 311. The shell and the base 2 are die-cast or integrally formed by machining (such as CNC machine tool machining). The cover 312 is detachably fixedly connected to the main shell 311 by screws or a snap-fit ​​structure.

[0017] It can be understood that the structure of the base 2 has many embodiments, such as a frame-like or plate-like structure. In one embodiment of the present utility model, Figures 2 to 4 As shown, the base 2 is plate-shaped, a support platform 121 is formed inside the shell 1, and the base 2 is placed on the support platform 121 and fixedly connected to the support platform 121, specifically, it can be detachably connected by a snap-on structure or screws.

[0018] It can be understood that the gear set 5 includes a plurality of gears 50 meshing with each other, the bottom surface of the base 2 is formed with a plurality of first pivot grooves (not shown) for pivoting one end of the axle of the gear 50, and the inner wall of the housing 1 is formed with a plurality of second pivot grooves 122 for pivoting the other end of the axle of the gear 50, so that each gear can rotate under the drive of the output shaft. Further, in order to ensure smooth rotation of the gear and reduce the wear of the axle of the gear 50, bearings (not shown) can be installed at both ends of the axle of the gear, and each bearing is installed in the corresponding first pivot groove and second pivot groove 122.

[0019] Specifically, the rotating shaft 4 can be pivotally mounted on the base 2, and the end of the rotating shaft 4 is exposed on the bottom surface of the housing 1 to facilitate connection with the pivot shaft of the valve (not shown). When the output shaft of the motor 3 rotates, the rotating shaft 4 can be driven by the gear set 5 to drive the pivot shaft of the valve to rotate, thereby controlling the opening and closing of the valve.

[0020] The housing 1 is provided with a through hole 15 above one of the gears of the gear set 5. The axle 51 of the gear 50 passes upward through the base 2 and extends to approach or extend out of the through hole 15. The top of the axle 51 is provided with a control part 52. The control part can be a non-circular countersunk hole (such as a square countersunk hole or a hexagonal countersunk hole, etc.) provided on the top surface of the axle 51, or a handle provided on the top of the axle 51 (not shown when the pivot shaft extends out of the housing), so that the user can drive the axle 51 to rotate the gear by tools (such as a hexagonal wrench or a square wrench, etc., not shown) or by hand, so that the rotating shaft 4 can be manually driven to rotate in the case of power failure or motor 3 failure to control the opening and closing of the valve. It can be understood that a sealing structure is provided between the axle 51 and the through hole 15 to prevent water or dust from entering the interior of the housing.

[0021] In the embodiment of the utility model, the top surface of the base 2 is installed with upper and lower micro switches 61 and 62, and the rotating shaft 4 has an extension 41 extending upward from the base 2, and the extension 41 is provided with two upper cams 71 and lower cams 72 respectively matched with the upper and lower micro switches 61 and 62. When the valve needs to be opened, the control system (such as the control circuit) drives the motor 3 to rotate according to the instruction, and when the motor 3 drives the rotating shaft 4 to rotate to the position of opening the valve, the upper cam 71 rotates with the rotating shaft 4 to the position of triggering the upper micro switch 61, and at this time, the control system controls the motor to stop rotating according to the signal fed back by the upper micro switch 61, so as to realize the opening operation of the valve. When the valve needs to be closed, the control system (such as the control circuit) drives the motor 3 to rotate according to the instruction, and when the motor 3 drives the rotating shaft 4 to rotate to the position of closing the valve, the lower cam 72 rotates with the rotating shaft 4 to the position of triggering the lower micro switch 62, and at this time, the control system controls the motor to stop rotating according to the signal fed back by the lower micro switch 62, so as to realize the closing operation of the valve.

[0022] In the embodiment of the utility model, the upper cam 71 and the lower cam 72 can be an integral structure formed in one piece, or can be two independent split structures, and the upper cam 71 and the lower cam 72 are fixed to the extension portion 41. The split structure is preferred.

[0023] Specifically, the free end of the swing arm of the upper micro switch 61 can be pivotally provided with a first roller 63, and the free end of the swing arm of the lower micro switch 62 can be pivotally provided with a second roller 64. When the upper cam 71 or the lower cam 72 swings with the rotation of the extension part 41, the end of the upper cam 71 or the lower cam 72 away from the extension part 41 can achieve rolling cooperation with the wheel surface of the first roller 63 or the second roller 64 to force the swing arm to press the button of the upper micro switch 61 or the lower micro switch 62.

[0024] Specifically, the two micro switches 61 and 62 are stacked and arranged on the top surface of the substrate.

[0025] Specifically, the housing 11 includes an upper shell 11 and a lower shell 12, which are butt-jointed and connected by fastening screws (not shown) or a snap-fit ​​structure (not shown) to enclose a space for accommodating the actuator.

[0026] Specifically, a cap body 42 with an open mark and a closed mark is fixedly provided on the upper end of the extension portion 41, and the cap body 42 can rotate with the extension portion 41. The shell 1 is provided with a transparent or partially transparent cover body 13 at a position corresponding to the cap body 42. The working status of the electric valve actuator can be obtained by observing the marked position of the cap body 42 through the transparent area of ​​the cover body 13.

[0027] Furthermore, a sealing structure (not shown) is provided at the joint of the rotating shaft 4 and the housing 11 to prevent dust or liquid from entering the housing 1. Specifically, the sealing structure is a sealing ring (not shown), and a groove is provided on the peripheral wall of the rotating shaft 4 and the sealing ring (not shown) is installed.

[0028] It can be understood that the utility model electric valve actuator can also include components such as a control circuit (not shown) and a wiring terminal 8 arranged on the base 2. The control circuit is used to connect the external circuit and the motor 3 and the upper and lower micro switches 61, 62 inside the housing 1. The wiring terminal 8 is used to transfer the conductive wire. As for how to connect, it belongs to the existing technology and will not be repeated here. Of course, the control circuit can also be arranged in an external control system.

[0029] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An electric valve actuator, comprising a housing and an actuator installed inside the housing, wherein the actuator comprises a base and a motor, a gear set and a rotating shaft arranged on the base, the motor has a housing, and the housing comprises a main housing and a cover, characterized in that: The main shell and the base are formed in one piece.

2. The electric valve actuator according to claim 1, characterized in that: A circular enclosure extends integrally from the surface of the base, and the enclosure and the base form the main shell.

3. The electric valve actuator according to claim 1, characterized in that: The shell and the base are integrally die-cast.

4. The electric valve actuator according to claim 1, characterized in that: The base is in the shape of a plate, a support platform is formed inside the shell, the base is placed on the support platform, and is fixedly connected to the support platform.

5. The electric valve actuator according to claim 1, characterized in that: The gear set includes a plurality of gears meshing with each other. The bottom surface of the base is formed with a plurality of first pivot grooves for pivoting one end of the axle of the gear, and the inner wall of the shell is formed with a plurality of second pivot grooves for pivoting the other end of the axle of the gear.

6. The electric valve actuator according to claim 5, characterized in that: Bearings are installed at both ends of the wheel shaft of the gear, and each bearing is installed in the corresponding first pivot groove and second pivot groove.

7. The electric valve actuator according to claim 5, characterized in that: The shell is provided with a through hole above one of the gears in the gear set. The axle of the gear passes upward through the base and extends to approach or extend out of the through hole. A control part is provided on the top of the axle. The control part is a non-circular countersunk hole provided on the top surface of the axle, or a handle provided on the top of the axle.

8. The electric valve actuator according to claim 1, characterized in that: The top surface of the base is provided with upper and lower micro switches, the rotating shaft has an extension portion extending upward from the base, and the extension portion is provided with an upper cam and a lower cam respectively matched with the upper and lower micro switches.

9. The electric valve actuator according to claim 8, characterized in that: The free end of the swing arm of the upper micro switch can be pivotally provided with a first roller, and the free end of the swing arm of the lower micro switch can be pivotally provided with a second roller. When the upper cam or the lower cam swings with the rotation of the extension part, the end of the upper cam or the lower cam away from the extension part can achieve rolling cooperation with the wheel surface of the first roller or the second roller to force the swing arm to press the button of the upper micro switch or the lower micro switch.

10. The electric valve actuator according to claim 8, characterized in that: A cap body with an opening mark and a closing mark is fixedly provided on the upper end of the extension part, and the cap body can rotate with the extension part. A transparent or partially transparent cover body is provided at a position of the shell corresponding to the cap body.

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