Actuators and valves

Abstract

The present invention discloses an actuator and a valve. The driving device includes a transmission unit and a motor (1) having an output shaft (11) connected to the transmission unit. The transmission unit includes a transmission part (2) that is fixed to the output shaft (11) or engaged to limit its position. The output shaft (11) rotates the transmission part (2). The transmission unit includes a magnetic element (3). The driving device includes a Hall element (4) corresponding to the magnetic element (3). The transmission part (2) includes a columnar portion (25) having a first hole (21). The first hole passage (21) includes a first opening (22) located on the outer wall of the columnar portion (25), and at least a portion of the magnetic element (3) penetrates through the first opening (22) and enters the first hole passage (21). The magnetic element (3) is fixed to the columnar portion (25), thereby reducing the resultant force on the magnetic element (3) during installation. After installation, the transmission part (2) envelops a portion of the magnetic element (3), thereby reducing the risk of damage to the magnetic element (3) during installation and use.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on January 18, 2021, bearing application number 2021100640987 and entitled "Driver," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of control technology, in particular to actuators and valves. [Background technology]

[0003] The transmission component is applied to various devices that require torque transmission, and by disposing a magnetic element on the output shaft of a motor, the rotation angle and operating state of the output shaft of the motor are determined by the magnetic field of the magnetic element. Since the base material of a magnetic element is generally fragile, how to reduce damage to the magnetic element when mounting the magnetic element to the shaft or during the operation of the motor, and how to improve product yield and reliability during use are currently problems to be solved. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to reduce the risk of damage to the magnetic element. [Means for solving the problem]

[0005] The present invention provides a drive device, comprising: a transmission unit; and a motor having an output shaft connected to the transmission unit; the transmission unit comprises a transmission part fixed to the output shaft or engaged to limit its position; the output shaft drives the transmission part to rotate; the transmission unit comprises a magnetic element; the drive device comprises a Hall element arranged in close proximity to the magnetic element; the transmission part comprises a columnar part; the columnar part has a first hole path including a first opening located on an outer wall of the columnar part; at least a portion of the magnetic element passes through the first opening and enters the first hole path; and the magnetic element is fixed to the columnar part.

[0006] The present invention further provides a valve, which includes a valve body and the above-mentioned driving device, wherein the transmission unit and the valve body are connected to transmit each other.

[0007] In the present invention, the transmission part includes a columnar portion having a first hole passage, and at least a portion of the magnetic element passes through the first opening and enters the first hole passage, thereby reducing the resultant force on the magnetic element when installed, and after installation, the transmission part encloses a portion of the magnetic element, reducing the risk of damage to the magnetic element during installation and use. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a partial structural view of a driving device provided by an embodiment of the present invention; [Figure 2] FIG. 2 is a three-dimensional structural view of a part of the drive device of FIG. [Figure 3] FIG. 3 is a cross-sectional view of the transmission component of FIG. 2. [Figure 4] FIG. 2 is an exploded structural view of a part of the drive device of FIG. [Figure 5] FIG. 5 is a plan view of a part of the drive unit of FIG. 4. [Figure 6] FIG. 6 is a cross-sectional structural view of the drive device of FIG. 5 taken along line AA. [Figure 7] 6 is a cross-sectional structural view of the drive device of FIG. 5 taken along line BB. [Figure 8]FIG. 10 is a three-dimensional structural view of a transmission unit according to another embodiment of the present invention. [Figure 9] FIG. 10 is a cross-sectional structural view of a transmission unit according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0010] As shown in FIG. 1, the drive device includes a motor 1 and a transmission unit, the motor 1 includes an output shaft 11 connected to the transmission unit, and the transmission unit includes a transmission part 2 fixed to the output shaft 11 or engaged to limit its position. For example, the transmission part 2 is injection molded integrally with the output shaft 11, or is press-fitted, or is engaged to limit its position by a connecting part such as a spline, and the output shaft 11 rotates the transmission part 2, and the transmission unit and the valve body of the valve are connected to transmit power, thereby controlling the rotation angle of the valve body. The drive device further includes a housing 6 to which the motor 1 is fixed.

[0011] As shown in FIGS. 1 to 3, the transmission component 2 includes a columnar portion 25. The columnar portion 25 has a first hole 21 with a first opening 22 located on the outer wall of the columnar portion 25 , and the transmission unit further includes a magnetic element 3 . At least a portion of the magnetic element 3 penetrates the first opening 22 and enters the first hole path 21 , and the magnetic element 3 is fixed to the columnar portion 25 . When mounting, the magnetic element 3 is directly pressed into the first hole 21 through the first opening 22, and after mounting, the inner wall portion corresponding to the first hole 21 and the outer wall portion of the magnetic element 3 are tightly fitted together, thereby fixing the magnetic element 3 and the transmission part 2. In another embodiment, the magnetic element 3 and the transmission part 2 may be fixed in an injection molded manner.

[0012] Since the transmission part 2 is made of a non-ferromagnetic material, for example plastic, the transmission part 2 does not affect the magnetic field of the magnetic element 3 . Since the hardness of the transmission part 2 is less than that of the magnetic element 3, the risk of the magnetic element 3 being broken or damaged during the process of press-fitting the magnetic element 3 into the first hole 21 is reduced. Furthermore, during the pressing process, the radial force of the corresponding inner wall portion of the first hole passage 21 on the magnetic element 3 points from the periphery of the outer wall portion of the magnetic element 3 to the center of the magnetic element, i.e., the resultant radial force of the inner wall portion of the first hole passage 21 on the magnetic element 3 is small, reducing the risk of breakage of the magnetic element 3. Whereas the magnetic element surrounds the motor output shaft, is press-fitted to the motor output shaft, and is exposed to the outside of the motor output shaft, in an embodiment of the present invention, the magnetic element 3 is press-fitted into the first hole 21, thereby reducing the risk of breakage of the magnetic element 3. In this embodiment, the magnetic element 3 is cylindrical, and the cross section of the first hole 21 is circular, so that the magnetic element 3 can be easily inserted into the transmission part 2 .

[0013] As shown in FIGS. 1 to 4, the power transmission part 2 rotates around the axial direction of the output shaft 11, and XX is the rotation center line of the power transmission part 2. The center line of the first hole 21 intersects with the rotation center line XX of the transmission part 2, and preferably, the center line of the first hole 21 is perpendicular to the rotation center line XX of the transmission part 2, thereby reducing the deviation of the center of gravity of the transmission part 2 from the rotation center line XX. Furthermore, the transmission component 2 includes a second hole passage 26, the center line of which overlaps with the rotation center line of the transmission component 2, and at least a portion of the output shaft 11 enters the second hole passage 26.

[0014] As shown in FIGS. 5 to 7, the magnetic element 3 is strip-shaped, and both ends in the axial direction thereof are a north (N) pole and a south (S) pole, respectively. The drive device further includes a Hall element 4 disposed in proximity to the circuit board 5 and the magnetic element 3 . The Hall element 4 is fixed to a circuit board 5 . When the transmission part 2 rotates, the north and south poles of the magnetic element 3 alternately approach the Hall element 4 , and the Hall element 4 senses the magnetic field of the magnetic element 3 . The motor 1 is a DC motor, and the Hall element 4 is part of a switching-type Hall sensor. The switching-type Hall sensor outputs the detected magnetic field as a square-wave electrical signal to a controller to obtain information such as the rotational speed of the transmission part 2, and controls the position of the valve element driven by the drive device. The magnetic element 3 is arranged axially symmetrically with respect to the axis of the output shaft 11, i.e., the magnetic element 3 is symmetrical with respect to the central axis of the output shaft 11, and when the output shaft 11 and the rotation axis of the transmission part 2 are arranged coaxially, the magnetic element 3 is arranged axially symmetrically with respect to the rotation axis of the transmission part 2, so that the magnetic field lines outside the transmission part 2 are distributed symmetrically in a rotational manner, and the Hall sensor generates an electric signal with a uniform frequency, which reduces the vibration caused by the transmission part 2 due to eccentricity. The magnetic element 3 is made of a rare earth permanent magnet material, such as a neodymium magnet, and has a strong magnetic field, allowing for a large return differential, which improves the anti-interference capability of the Hall sensor during detection. In this embodiment, only one magnetic element 3 needs to be installed, and the north and south poles of the magnetic element are used simultaneously, achieving a large return difference, ensuring the interference resistance of the Hall element 4, and simplifying the magnetic element 3 and its installation structure. Compared to ordinary switching type Hall sensors, the larger the magnetic field return difference, the stronger the Hall sensor's ability to resist interference. The shortest distance between the Hall element 4 and the magnetic element 3 is 6 mm or less, which improves the interference resistance capability of the Hall element 4 in detection.

[0015] Furthermore, by arranging the magnetic element 3 in the transmission part 2 that is directly connected to the output shaft 11 of the motor 1, rather than arranging the magnetic element 3 in the transmission part that is indirectly connected to the output shaft 11, the rotational frequency of the motor 1 is recorded more accurately, improving the control accuracy of the drive device with respect to the valve body position. In this embodiment, only one magnetic element 3 is required to be installed, and when the transmission ratio of the transmission unit is 50 or more, detecting the magnetic element 3 ensures high valve body rotation control accuracy, and limits the valve body rotation control accuracy to within ±5 degrees.

[0016] As shown in Figures 2, 3 and 6, the transmission component 2 includes a toothed portion 24, which is arranged coaxially with the columnar portion 25 and aligned along the axial direction of the columnar portion 25 and the transmission component 2. The outer surface of the columnar portion 25 is relatively flat, and the toothed portion 24 meshes with another gear. Since the columnar portion 25 is spaced apart from the output shaft 11 relative to the toothed portion 24, the magnetic element 3 attached to the columnar portion 25 is relatively spaced apart from the output shaft 11, preventing the magnetic element 3 from interfering with the output shaft 11. The first hole path 21 has two first openings 22, and the length of the magnetic element 3 is equal to or greater than the length of the first hole path 21. In this embodiment, most of the magnetic element 3 is located inside the transmission part 2, so that the transmission part 2 protects the magnetic element 3 and reduces the risk of damage to the magnetic element 3.

[0017] In this embodiment, the toothed portion 24 is in the form of a worm. In other embodiments, the toothing 24 may be a straight tooth, an oblique tooth, or a conical tooth form. As shown in FIG. 8, in another embodiment of the transmission part, the toothed portion 24 is a straight toothed form.

[0018] In another embodiment, as shown in FIGS. 6 and 9, there are at least two magnetic elements 3, there are at least two first hole paths 21, the first hole paths 21 are blind holes, and the first hole paths 21 are axially symmetrically distributed in the columnar portion 25 with respect to the rotation axis of the transmission part 2; In this case, the length of the magnetic element 3 is equal to or greater than the length of the first hole path 21 . This reduces the distance between the magnetic element 3 and the Hall element 4, improving the detection accuracy of the Hall element 4 with respect to the rotation angle of the transmission part 2. As shown in FIG. 9, four magnetic elements 3 are distributed in the transmission component, and the center line of the first hole 21 intersects with the rotation center line of the transmission component, for example, the center line of the first hole 21 is perpendicular to the rotation center line of the transmission component, and the N poles and S poles of the magnetic elements 3 are arranged alternately along the outer circumferential direction of the columnar portion 25. The number of magnetic elements 3 and first hole paths 21 can be set according to needs, for example, there may be two magnetic elements 3 and two first hole paths 21, or there may be four magnetic elements 3 and four first hole paths 21, or there may be three magnetic elements 3 and three first hole paths 21.

[0019] As shown in Figures 3 and 6, the transmission part 2 includes a first end face portion 291 and a second end face portion 292 located on both sides in the axial direction, and the first end face portion 291 and the second end face portion 292 are both perpendicular to the output shaft 11, the toothed portion 24 and the columnar portion 25 are both located between the first end face portion 291 and the second end face portion 292, the first end face portion 291 is located on the side of the columnar portion 25 away from the toothed portion 24, or is the end face portion of the columnar portion 25, and the second end face portion 292 is located on the side of the toothed portion 24 away from the columnar portion 25, or is the end face portion of the toothed portion 24. The transmission component 2 includes a first boss portion 281 that protrudes from a first end face portion 291 in the axial direction, and a second boss portion 282 that protrudes from a second end face portion 292 in the axial direction. The first boss portion 281 and the second boss portion 282 both extend along the axial direction of the transmission part 2, the cross section of the first boss portion 281 is circular and its diameter is smaller than the diameter of the columnar portion 25, and the cross section of the second boss portion 282 is circular and its diameter is smaller than the outer diameter of the toothed portion 24.

[0020] As shown in Figures 4 to 6, the housing 6 includes an inner wall portion 65, the transmission unit is located on one side of the inner wall portion 65 in the height direction, and the housing 6 further includes a first position limiting portion 61 and a second position limiting portion 63 protruding from the inner wall portion 65. The first position limiting portion 61 has a first groove 62 extending from its tip into the interior of the first position limiting portion 61, and the second position limiting portion 63 has a second groove 64 extending from its tip into the interior of the second position limiting portion 63, and the cross sections of the first groove 62 and the second groove 64 are both arc-shaped. At least a portion of the first boss portion 281 is located in the first groove 62, and at least a portion of the second boss portion 282 is located in the second groove 64, and the corresponding inner wall of the first groove 62 and the side wall portion of the first boss portion 281 are slidably fitted together, and the corresponding inner wall of the second groove 64 and the side wall portion of the second boss portion 282 are slidably fitted together. The first position limiting portion 61 and the second position limiting portion 62 support the power transmission component 2 in the radial direction, thereby reducing vibration of the power transmission component 2 in the radial direction.

[0021] The axes of the circuit board 5 and the output shaft 11 are both parallel to the inner wall portion 65, the Hall element 4 is located between the columnar portion 25 and the inner wall portion 65, and the first position limiting portion 61 and the second position limiting portion 62 can prevent the transmission part 2 from being too close to the Hall element 4. By positioning the Hall element 4 between the first position limiting portion 61 and the second position limiting portion 63 along the axial direction of the output shaft 11, the occupation of the Hall element 4 in the internal space of the drive device is reduced, making the structure of the drive device more compact.

[0022] Herein, relational terms such as "first," "second," etc. are intended to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or ordering between those entities or operations. The above examples are for illustrating the present invention, not for limiting the present invention, and the present specification may make amendments or equivalent substitutions to the present invention, and all improvements that do not deviate from the spirit and scope of the present invention fall within the scope of the present invention.

Claims

1. A drive device including a transmission unit and a motor having an output shaft connected to the transmission unit, the transmission unit includes a transmission part fixed to or engaged with the output shaft so as to limit its position; The output shaft drives the transmission component to rotate, the transmission unit further includes a magnetic element; the driving device includes a Hall element disposed in proximity to the magnetic element; the transmission component includes a columnar portion having a first hole; the first passage includes a first opening located in an outer wall of the columnar portion; At least a portion of the magnetic element passes through the first opening and enters the first passage, the magnetic element is fixed to the columnar portion; The drive device further includes a circuit board; the Hall element is fixed to the circuit board; the magnetic element is in the form of a strip; the north pole and south pole of the magnetic element are located on end faces of the magnetic element in the axial direction, the Hall element faces an outer wall of the columnar portion and is located between the columnar portion and the circuit board; When the transmission part rotates, the north pole and the south pole of the magnetic element alternately approach the Hall element, and the Hall element senses the magnetic field of the magnetic element; a center line of the first hole intersects with a rotation center line of the transmission component; The number of the first holes is at least two, the first hole is a blind hole, The first holes are distributed axially symmetrically in the columnar portion with respect to the rotation axis of the transmission part, the length of the magnetic element is equal to or greater than the length of the first hole; the transmission component includes a toothed portion arranged coaxially with the columnar portion, The transmission component includes a second hole, a center line of the second hole overlaps with a rotation center line of the transmission component; At least a portion of the output shaft enters the second hole passage, the columnar portion is spaced apart from the output shaft relative to the toothed portion, The transmission component includes a first end surface portion and a second end surface portion located on both sides in the axial direction, the first end surface portion is located on a side of the column portion away from the tooth portion, the second end surface portion is located on a side of the tooth portion away from the column portion, the transmission component includes a first boss portion protruding from a first end surface portion in the axial direction and a second boss portion protruding from the second end surface portion in the axial direction, a cross section of the first boss portion is circular, and the diameter thereof is smaller than the diameter of the columnar portion; The cross section of the second boss portion is circular, and the diameter thereof is smaller than the diameter of the toothed portion, the drive device includes a housing; The motor is fixed to the housing, the housing includes an inner wall portion and a first position limiting portion and a second position limiting portion protruding from the inner wall portion; the first position limiting portion has a first groove, the second position limiting portion has a second recessed groove, the corresponding inner wall of the first recessed groove and the side wall of the first boss portion are in sliding engagement with each other; The drive device is characterized in that the corresponding inner wall portion of the second recessed groove and the side wall portion of the second boss portion are slidably fitted together.

2. 2. The drive device according to claim 1, wherein the cross section of the first hole is circular.

3. the hardness of the transmission part is less than that of the magnetic element; The transmission parts are made of plastic material; The magnetic element is made of a rare earth permanent magnet material, 2. The drive device according to claim 1, wherein the corresponding inner wall of the first hole and the outer wall of the magnetic element are tightly fitted together.

4. 2. The drive device according to claim 1, wherein the toothed portion is a straight toothed portion or a worm toothed portion.

5. the Hall element is located between the first position limiting portion and the second position limiting portion, the circuit board and the output shaft are both parallel to the inner wall portion; 2. The drive device according to claim 1, wherein the Hall element is located between the columnar portion and the inner wall portion.

6. 6. The drive device according to claim 1, wherein the shortest distance between the Hall element and the magnetic element is 6 mm or less.

7. The driving device includes a switching type Hall sensor; 6. The drive device according to claim 1, wherein the switching type Hall sensor includes the Hall element.

8. the driving device includes one of the magnetic elements, 6. The drive device according to claim 1, wherein the transmission ratio of the transmission unit is 50 or more.

9. A valve, a valve body and the drive device according to any one of claims 1 to 8, The valve is characterized in that the transmission unit and the valve body are connected to transmit power.

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