Butterfly valve drive

Abstract

The utility model discloses a butterfly valve driver, including the valve plate drive shaft of rotation connection on the valve body and the fixed connection of drive ware casing on the valve body, the valve plate drive shaft is inserted into the drive ware casing, and the swing arm of being located in the drive ware casing and can drive the valve plate drive shaft rotation is equipped on the valve plate drive shaft, the drive ware casing is rotationally connected with the lead screw of can be connected with the drive power device, and the lead screw nut of being located in the drive ware casing and the swing arm swing of rotation lead screw can be driven through it of lead screw is screwed on the lead screw, and the guide mechanism of being equipped with for the sliding of lead screw nut along it on the drive ware casing. The utility model discloses simple structure, and the production cost is low.

Description

Technical Field

[0001] This utility model relates to a driving device that can drive a butterfly valve to open and close, specifically a butterfly valve actuator. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve. Butterfly valves are characterized by their simple structure, small size, light weight, low material consumption, small installation dimensions, rapid opening and closing, 90° reciprocating rotation, and low driving torque. They are used to cut off, connect, and regulate the medium in pipelines, and have excellent fluid control characteristics and sealing performance.

[0003] In operation, butterfly valves mostly employ a worm gear drive to rotate the valve plate drive shaft, which in turn rotates the valve plate to open and close the valve. The worm gear drive pair requires high machining precision and has a relatively complex manufacturing process. Furthermore, it demands high positional accuracy within the drive unit housing, resulting in high costs.

[0004] This invention addresses the high cost of the aforementioned worm gear drive device. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a butterfly valve actuator, which has the advantage of low operating cost compared with the traditional worm gear drive device.

[0006] To solve the above-mentioned technical problems, this utility model provides a butterfly valve actuator, including a valve plate drive shaft rotatably connected to the valve body and an actuator housing fixedly connected to the valve body. Its structural features are as follows: the valve plate drive shaft extends into the actuator housing, and a swing arm located within the actuator housing is mounted on the valve plate drive shaft, capable of driving the valve plate drive shaft to rotate; a lead screw rotatably connected to the actuator housing, capable of connecting to a driving power device, is screwed onto the lead screw, and a lead screw nut located within the actuator housing, through which rotating the lead screw can drive the swing arm to swing; the actuator housing is provided with a guide mechanism for the lead screw nut to slide along it. Depending on the application scenario, a handwheel can be mounted on the lead screw for manual drive, or the lead screw can be connected to a motor, pneumatic motor, or hydraulic motor to achieve electric, pneumatic, or hydraulic actuation.

[0007] The lead screw nut is provided with a drive column, and the swing arm is provided with an elongated hole. The drive column is inserted into the elongated hole to realize the rotation of the lead screw, which can drive the swing arm to swing through the lead screw nut; the guide mechanism is a sliding groove provided on the wall of the driver housing.

[0008] The elongated hole and the drive post are in a clearance fit in the width direction.

[0009] The drive column extends into the slide groove, and rotating the lead screw can drive the lead screw nut to slide along the slide groove.

[0010] The valve plate drive shaft has a non-circular section with a non-circular cross-sectional shape on the shaft section inside the driver housing; the swing arm has a non-circular hole that matches the non-circular section, and the swing arm is fitted onto the non-circular section through the non-circular hole so that the swing arm can drive the valve plate drive shaft to rotate.

[0011] The non-circular section has a square cross-sectional shape, and the non-circular hole is a square hole.

[0012] The driver housing is equipped with a limiting bracket to prevent the swing arm from detaching from the non-circular section.

[0013] The valve plate drive shaft extends out of the top surface of the driver housing, and an indicator plate that can indicate the opening and closing status of the butterfly valve is installed on the end of the valve plate drive shaft.

[0014] The valve plate drive shaft has an opening slot at its protruding end. The indicator is installed in the opening slot and is fixed to the drive shaft by bolts passing through the opening slot and the indicator.

[0015] The actuator housing contains a microswitch that is controlled to be on or off by touching its button with a lead screw nut.

[0016] This invention employs a lead screw and nut transmission pair to drive the valve plate drive shaft. Compared to the traditional butterfly valve actuator using a worm gear transmission pair, the lead screw and nut transmission pair has significantly lower requirements in terms of machining accuracy, ease of machining, and process complexity, thus significantly reducing manufacturing costs. Worm gear transmission pairs have high requirements for the assembly center distance: changes in the center distance may lead to poor meshing between the worm wheel and worm, causing vibration and noise during transmission, affecting the smoothness of transmission, and increasing friction during worm gear transmission. This necessitates improving the positional accuracy of the worm mounting hole and the valve plate drive shaft through hole on the actuator housing (the worm wheel needs to be mounted on the valve plate drive shaft), as well as the positioning accuracy of the actuator housing on the valve body. This also increases the machining accuracy of the actuator housing, thereby increasing the manufacturing cost of the worm gear butterfly valve actuator. This invention employs a lead screw and nut to drive a rocker arm mounted on the valve plate drive shaft, thereby rotating the valve plate drive shaft. The lead screw and nut are movably connected to the rocker arm, reducing the requirements for the positional accuracy of the lead screw mounting hole and drive shaft through hole on the actuator housing, as well as the positioning accuracy of the actuator housing on the valve body. This significantly reduces the processing cost of the actuator housing. Therefore, the manufacturing cost of this invention is significantly lower than that of traditional worm gear butterfly valve actuators. Furthermore, the opening and closing of the butterfly valve can be achieved through the cooperation of the lead screw and nut transmission pair and the rocker arm mounted on the valve plate drive shaft, thus this invention also has the advantage of simple structure. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the butterfly valve actuator mounted on the valve body; Figure 2 yes Figure 1 The diagram shown is a three-dimensional structural representation of the butterfly valve actuator with the top cover of the actuator housing removed, viewed from a perspective. Figure 3 yes Figure 1 The diagram shows a three-dimensional structure of the butterfly valve actuator with the top cover of the actuator housing removed, viewed from another perspective. Figure 4 This is a top view of the butterfly valve actuator without the top cover of the actuator housing and the mounting components located above the top cover of the actuator housing. Figure 5 It is along Figure 4 Sectional view of line AA in the middle; Figure 6 It is along Figure 4 Sectional view of the middle BB line; Figure 7 This is a three-dimensional structural diagram of the swing arm; Figure 8 This is a structural diagram of the assembly of the swing arm and the valve plate drive shaft. Detailed Implementation

[0018] Reference Figure 1-6 The butterfly valve actuator provided by this utility model includes a valve plate drive shaft 1 rotatably connected to a valve body 12 and an actuator housing 2 bolted to the top of the valve body 12. The bottom wall of the actuator housing 2 has a through hole 13 for the valve plate drive shaft 1 to pass through. The diameter of the through hole 13 is larger than the diameter of the valve plate drive shaft 1, so that the valve plate drive shaft 1 can easily pass into the actuator housing 2. The valve plate drive shaft 1 extends into the actuator housing 2, and a swing arm 3 is mounted on the shaft section of the valve plate drive shaft 1 located inside the actuator housing 2. The swing of the swing arm 3 can drive the valve plate drive shaft 1 to rotate, thereby opening and closing the butterfly valve. A lead screw 4 rotatably connected to the actuator housing 2 can be connected to a drive power device. The drive power device can be selected according to the usage scenario. For example, a handwheel can be mounted on the lead screw for manual drive, or the lead screw can be connected to a motor, pneumatic motor, or hydraulic motor to achieve electric, pneumatic, or hydraulic operation. The drive power device shown in the figure of this utility model is a handwheel 14 mounted on the lead screw 4. A screw nut 5 is screwed onto the lead screw 4 and located inside the drive housing 2. Rotating the lead screw can drive the screw nut 5 to move along the lead screw axis, and the movement of the screw nut 5 can drive the swing arm 3 to swing.

[0019] Reference Figure 1-6 And focus on referring to Figure 5 and Figure 6 For ease of description, let's use Figure 4 The orientation is defined based on the position on the drawing: the bottom of the drawing is front, the top of the drawing is back, the left side of the drawing is left, and the right side of the drawing is right. A front axle sleeve 15 and a rear axle sleeve 16 are fixedly mounted on the front and rear side walls of the drive housing 2, respectively. The front axle sleeve 15 and the rear axle sleeve 16 are made of iron-copper based powder metallurgy. After the lead screw 4 passes through the drive housing 2, its rear end is fitted into the rear axle sleeve 16 to form a rotational fit, and its front end shaft is located within the front axle sleeve 15 to form a rotational fit. The lead screw 4 is rotatably connected to the drive housing 2 through the rotational fit with the front axle sleeve 15 and the rear axle sleeve 16. The front end of the lead screw 4 is located outside the drive housing 2, and the handwheel 14 is mounted on the front end of the lead screw 4. To prevent the lead screw 4 from coming off, the lead screw 4 is equipped with an anti-disengagement device located inside the driver housing 2 and close to the front bushing 15. The anti-disengagement device can be a shaft spring retaining ring. In this utility model, the retaining ring 20 is fixed to the lead screw 4 by a pin. Of course, other anti-disengagement measures can also be used, such as a stop block, baffle, or other equivalent replacement method connected to the lead screw 4.

[0020] Reference Figure 1-8 To facilitate the installation of the swing arm 3 and ensure that the swing of the swing arm 3 can drive the valve plate drive shaft 1 to rotate, a non-circular section 16 with a non-circular cross-sectional shape is provided on the shaft section of the valve plate drive shaft 1 located inside the driver housing 2; the swing arm 3 is provided with a non-circular hole adapted to the non-circular section, and the swing arm 3 is fitted onto the non-circular section through the non-circular hole so that the swing of the swing arm 3 can drive the valve plate drive shaft 1 to rotate. After the swing arm 3 is fitted onto the non-circular section through the non-circular hole, the swing arm 3 rests on the step transitioning between the non-circular section and the main body of the valve plate drive shaft 1. (Refer to...) Figure 7 and Figure 8 , Figure 8 The assembly relationship between the rocker arm 3 and the valve plate drive shaft 1 is shown. Figure 8 The non-circular section 16 shown has a square cross-sectional shape, and the non-circular hole on the swing arm 3 is a square hole 19. The swing arm 3 also has an elongated hole 7. The cross-sectional shape of the non-circular section 16 can also be triangular, pentagonal, hexagonal, elliptical, etc. The non-circular hole on the swing arm 3 should be designed to match the cross-sectional shape of the non-circular section. The general principle is that after the swing arm 3 is fitted onto the valve plate drive shaft 1 through its non-circular hole, there should be no relative rotation between the two. Further reference... Figure 5 and Figure 6The lead screw nut 5 is provided with a drive post 6, which is inserted into the elongated hole 7 on the swing arm 3 so that rotating the lead screw can drive the swing arm 3 to swing. To prevent the lead screw nut 5 from swaying during movement, a guide mechanism is required to guide the lead screw nut 5. The guide mechanism is a groove 8 provided on the lower wall of the driver housing 2. The lower end of the drive post 6 extends into the groove 8, and rotating the lead screw can drive the lead screw nut 5 to slide along the groove 8. Of course, the guide mechanism can be provided with a slider on the lead screw nut 5 and a slide rail on the driver housing 2, or it can be provided with a guide post on the lead screw nut 5 and a guide groove on the driver housing 2 that can cooperate with the guide post, as well as other equivalent alternatives. Considering the principles of simple and compact structure, low manufacturing cost, and easy installation, the guide method of the present invention, in which the guide post 6 extends into the groove 8, is preferred. To prevent jamming that might occur if the lead screw nut 5 moves to its limit position and then moves in the opposite direction, the elongated hole 7 is fitted with the drive column 6 with clearance in its width direction. That is, the width of the elongated hole 7 is slightly larger than the outline of the drive column 6 inserted therein. Typically, the drive column 6 is cylindrical, and the width of the elongated hole 7 is slightly larger than the diameter of the drive column 6.

[0021] Reference Figure 1 and Figure 6 To facilitate observation of the valve's opening and closing status, the valve plate drive shaft 1 extends through the top surface of the actuator housing 2. An indicator plate 10, indicating the butterfly valve's opening and closing status, is mounted on the protruding end of the valve plate drive shaft 1. An opening groove is provided at the protruding end of the valve plate drive shaft, and the indicator plate 10 is installed within this groove. Bolt holes are provided on the groove wall and the indicator plate, and the indicator plate is fixed to the drive shaft by bolts passing through the bolt holes in the opening groove and the indicator plate. An upper bushing 17 is mounted on the top wall of the actuator housing 2. The valve plate drive shaft 1 passes through the upper bushing 17 and then extends through the top surface of the actuator housing 2. The valve plate drive shaft 1 and the upper bushing 17 form a rotational fit. A sealing ring, fitted onto the valve plate drive shaft 1, is provided between the valve plate drive shaft 1 and the upper bushing 17, which maintains the stability of the valve plate drive shaft 1's rotation and provides dust and water protection. Generally speaking, when the indicator 10 is perpendicular to the axis of the fluid passage inside the valve body, the valve is in a fully closed state; when the indicator 10 is parallel to the axis of the fluid passage inside the valve body, the valve is in a fully open state. Correspondingly, on / off indicators that cooperate with the indicator 10 can be set on the top surface of the actuator housing 2.

[0022] Reference Figure 2-4 and Figure 6Generally, after the rocker arm 3 is mounted on the valve plate drive shaft 1, it will not easily detach upwards. To prevent the rocker arm 3 from detaching from the non-circular section, a limit bracket 9 is installed inside the drive housing 2. A bent portion 18 protrudes upwards from the limit bracket 9 and is located above the rocker arm 3, preventing the rocker arm 3 from detaching upwards from the non-circular section. To facilitate remote display of whether the butterfly valve is in a fully closed state, a micro switch 11 is installed inside the drive housing 2 on the limit bracket 9. When the lead screw nut 5 moves into position and presses the button of the micro switch 11, the micro switch 11 is activated, and the butterfly valve can be displayed as closed at the remote control end. The drive housing 2 is provided with a wiring hole for the micro switch 11. A normally open micro switch is used, which closes when the lead screw nut 5 moves into position and presses its button; a normally closed micro switch is used, which opens when the lead screw nut 5 moves into position and presses its button. The choice between normally closed and normally open micro switches depends on the specific application requirements. The number of microswitches 11 can be determined according to the usage requirements. The figure shows two microswitches 11.

[0023] The limiting bracket 9 of this utility model serves two purposes: it not only restricts the swing arm 3 from detaching upward from the non-circular section, but also serves as a mounting bracket for the micro switch 11. Of course, the mounting bracket for the micro switch 11 can be set separately, but in terms of compact structure and ease of installation, the dual-purpose bracket is the most preferred option.

[0024] Reference Figure 1-6 The method of using this utility model is as follows: Rotating the handwheel 14 drives the lead screw 4 to rotate, the rotation of the lead screw 4 drives the lead screw nut 5 to move, and during the movement of the lead screw nut 5, the drive column 6 on it drives the swing arm 3 to swing, the swing arm 3 drives the valve plate drive shaft 1 to rotate, and then drives the valve plate connected to it to rotate. When the lead screw nut 5 moves to the limit position, the lead screw nut 5 touches the micro switch 11 button, the micro switch 11 sends a signal to the remote control terminal to display that the valve is closed. At this time, the butterfly valve is in the closed state, and the indicator 10 is in a state perpendicular to the axis of the fluid channel in the body. Rotating the handwheel 14 in the opposite direction, the lead screw nut 5 moves back, and during the back movement of the lead screw nut 5, the drive column 6 on it drives the swing arm 3 to swing back, the swing arm 3 drives the valve plate drive shaft 1 to reverse, and then drives the valve plate connected to it to reverse. When the lead screw nut 5 moves back to the limit position, the indicator 10 is in a state parallel to the axis of the fluid channel in the body. At this time, the butterfly valve is in the unobstructed state.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve actuator, comprising a valve plate drive shaft (1) rotatably connected to a valve body and an actuator housing (2) fixedly connected to the valve body, characterized in that: The valve plate drive shaft (1) extends into the driver housing (2). The valve plate drive shaft (1) is equipped with a swing arm (3) located inside the driver housing (2) and capable of driving the valve plate drive shaft (1) to rotate. The driver housing (2) is rotatably connected to a lead screw (4) that can be connected to a drive power device. The lead screw (4) is screwed with a lead screw nut (5) located inside the driver housing (2) and the rotation of the lead screw can drive the swing arm (3) to swing. The driver housing (2) is provided with a guide mechanism for the lead screw nut (5) to slide along it.

2. The butterfly valve actuator according to claim 1, characterized in that: The lead screw nut (5) is provided with a drive column (6), and the swing arm (3) is provided with a long hole (7). The drive column (6) is inserted into the long hole (7) to realize the rotation of the lead screw, which can drive the swing arm (3) to swing through the lead screw nut (5); the guide mechanism is a groove (8) provided on the wall of the driver housing (2).

3. The butterfly valve actuator according to claim 2, characterized in that: The elongated hole (7) has a clearance fit with the drive post (6) in its width direction.

4. The butterfly valve actuator according to claim 2, characterized in that: The drive column (6) extends into the slide groove (8), and rotating the lead screw can drive the lead screw nut (5) to slide along the slide groove (8).

5. The butterfly valve actuator according to claim 1, characterized in that: The valve plate drive shaft (1) is located in the drive housing (2) and has a non-circular section with a non-circular cross-section. The swing arm (3) has a non-circular hole that matches the non-circular section. The swing arm (3) is fitted onto the non-circular section through the non-circular hole so that the swing arm (3) can drive the valve plate drive shaft (1) to rotate.

6. The butterfly valve actuator according to claim 5, characterized in that: The non-circular section has a square cross-sectional shape, and the non-circular hole is a square hole.

7. The butterfly valve actuator according to claim 5, characterized in that: The drive housing (2) is connected to a limit bracket (9) to prevent the swing arm (3) from dislodging from the non-circular section.

8. The butterfly valve actuator according to any one of claims 1-7, characterized in that: The valve plate drive shaft (1) extends through the top surface of the driver housing (2), and an indicator plate (10) that can indicate the opening and closing status of the butterfly valve is installed on the end of the valve plate drive shaft (1).

9. The butterfly valve actuator according to claim 8, characterized in that: The valve plate drive shaft (1) has an opening groove at its protruding end. The indicator (10) is installed in the opening groove and is fixed to the drive shaft (1) by bolts passing through the opening groove and the indicator (10).

10. The butterfly valve actuator according to any one of claims 1-7, characterized in that: The actuator housing (2) contains a micro switch (11) that is controlled to be turned on or off by touching its button with a lead screw nut (5).

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