JP3106359U - Electric valve opening / closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the priority of a required speed because the power of an electric motor is too high, and accordingly the rotational force increases, and as a result, an abnormality occurs in the valve body, the switch is caused to become unrecyclable, or the speed reducer It is an object to regenerate the entire system quickly and inexpensively by exchanging the destructive part, instead of leaving the weakest part of the system undestructively destroyed.
In the present invention, a manual valve opening / closing joint is manufactured by cast aluminum or resin, and a valve opening / closing drive shaft is connected to a valve opening / closing drive shaft from an electric motor. The shape of the valve opening / closing joint should be determined in advance so that it will be destroyed with the required maximum torque that can be set for the size and type of valve. If there is an abnormality on the valve side, the valve opening / closing joint is destroyed before the maximum torque from the motor is transmitted to the drive shaft, so that the valve opening / closing part and the speed reduction mechanism transmitted from the motor are not damaged significantly.
[Selection] Figure 1

Description

  The present invention relates to an electric valve opening / closing mechanism that closes, opens, or branches a fluid flow in a chemical plant or a fluid piping facility.

  The electric valve opening / closing mechanism has a drive shaft that transmits the driving rotational force of the electric motor via a speed reduction mechanism and a joint mechanism that transmits the opening / closing shaft that opens and closes the valve. The joint mechanism also serves as a manual valve opening / closing joint. Oh. An electric valve having a release button for releasing the power of the motor and releasing a part of the speed reduction mechanism of the motor, and also having a manual valve opening / closing mechanism that can manually open and close the ball valve while pressing the release button. An opening / closing mechanism is known.

  However, it has a joint mechanism that continues the valve opening and closing shaft for opening and closing the valve and the drive shaft that transmits the driving force of the motor, and the joint mechanism has a release button that releases a part of the speed reduction mechanism of the motor. It is known that there is also a manual valve opening / closing function that can manually open and close the ball valve while holding down the release button and manually opening and closing the ball valve. Insert and move a metal rod in the through hole or a hole opened halfway in the opening and closing shaft for opening and closing, or connect the opening and closing shaft for opening and closing the valve and the drive shaft of the motor with a joint to become an arm on the outer part A shape is placed and driven. Even if the joint is made of metal or resin casting, it is connected and the arm is protruded from the outer portion, and the arm portion is used as a manual operation power point. The strength of the open / close joint was strong and the driving force of the electric motor was great, and the joint was not broken.

  Even if the strength of the open / close joint is strong and the driving force of the motor is strong, it has not been destroyed. If a foreign object such as stone or dust gets caught on the valve side, the driving force of the motor will slow down. As a result of increasing the mechanism, the driving force is transmitted until the opening and closing of the valve cannot be regenerated. As a result, it was necessary to replace parts of the opening / closing valve of the plant and to replace the drive unit.

Jinshin Sho 63-184272 In order to improve this, we propose a device that protects the driving force mechanism by the opening / closing valve, motor, and speed reducer by creating a part of the joint where the transmission torque is destroyed at the minimum necessary level.

  The problem to be solved is that in the electric valve opening / closing device, when stones / dust etc. enters the opening / closing valve and falls into an abnormal opening / closing state, the motor power is too high and the speed is reduced with priority on the required speed. As a result, the rotational force increases, resulting in the valve switch becoming unrecyclable or leaving the weakest part of the speed reducer unrecoverably destroyed. The purpose is to easily regenerate the entire system by replacing the destroyed part.

  In the present invention, a manual valve opening / closing joint is manufactured by casting a metal aluminum or resin, and a valve opening / closing shaft and an electric motor are connected to a valve opening / closing drive shaft. The shape of the valve opening / closing joint should be determined in advance so that it will be destroyed with the required maximum torque that can be set for the size and type of valve. If there is an abnormality on the valve side, the valve opening / closing joint is destroyed before the maximum torque from the motor is transmitted to the drive shaft, so that the valve opening / closing part and the speed reduction mechanism transmitted from the motor are not damaged significantly.

  The electric valve switch of the present invention is used in valve opening and closing devices that close and open the flow of fluid in chemical plants to be used and piping equipment for transporting fluids and gases. When foreign matter such as dust is mixed in, the cause can be determined and eliminated, and the normal state can be restored. However, the entire system can be recovered by replacing the valve opening / closing joint at a low cost.

  The best mode for carrying out the present invention will be described below with reference to FIG.

  FIG. 1 is a cross-sectional view of an embodiment in which the present invention is applied to an electric valve opening / closing mechanism. Reference numeral 1 denotes an electric valve opening / closing device. The valve can be opened and closed with two manual valve opening and closing arms while the motor is turned off and the release button 7 is pressed.

  FIG. 2 shows a manual valve switching joint according to the present invention. The characteristics will be described. The arm 2 serves as an operating point for transmitting a rotational force when the motor drive power is turned off and the release button 7 is pressed to manually open and close the valve. The valve joint 8 positions the valve opening / closing shaft 4 and the drive shaft 3 so that the two-plane cuts face each other, and is inserted so as to cover the outer diameter of the bearing housing 9 of the drive shaft, and is manually opened / closed on the drive shaft 3 side. The arm 2 which becomes a power point at the time of is configured. Thicken the joint on the drive shaft side slightly thicker than the outer diameter of the drive shaft. The joint wall thickness on the open / close shaft side is made thinner than the drive shaft side wall thickness, and determines the ability to transmit rotational force. The failure of the joint at the time of abnormality starts from the intersection of the two balanced surfaces and the outer diameter of the drive shaft.

  The opening / closing shaft and the drive shaft are connected by a joint with a slight gap in the longitudinal direction. Breakage progresses and the drive shaft bisects part of the joint to complete the breakage, and rotational torque cannot be transmitted.

  When the destruction is completed in such a way that the drive shaft bisects part of the joint, no further load is applied, and the valve opening / closing part and the drive function of the motor are protected.

As a motor used for valve opening / closing drive, a multi-pole permanent magnet type synchronous motor with a built-in speed reducer is used. These permanent magnet type synchronous motors, which are easily available on the market, are designed to have a strength that can sufficiently transmit torque by slowing the opening / closing operation speed by adding a further reduction gear. In order for the valve to change from the open state to the closed state, the valve becomes 0 degrees from the open state and then closes at 90 degrees and repeats its reciprocating motion. The opening / closing operation time is generally completed in about 30 seconds.
The reason for providing the release mechanism as part of the reduction mechanism is that the overall reduction ratio from the motor to the drive shaft is about 1/500, and the motor coking torque acts as a braking force at this reduction ratio, and the valve is manually opened and closed. Therefore, a rotational force that cannot be driven by human power is required. A release button is attached to a part of the speed reducer to release the transmission so that the valve can be opened and closed manually.

  This system has great utility in plant facilities that perform synthesis by moving gas, fluid, powder, and the like.

It is sectional drawing of one Example which applied this invention to the electric valve opening / closing mechanism. The manual valve switching joint of the present invention is shown. An electric valve opening / closing drive part is shown. A conventional electric valve opening / closing machine with a manually operated valve opening / closing function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric valve opening / closing machine 2 Manual operation arm 3 Drive shaft 4 Valve opening / closing shaft 5 Ball valve 6 Valve body 7 Release button 8 Valve opening / closing joint 9 Drive shaft bearing box 11 Drive mechanism 12 Electric motor

Claims (2)

A valve opening and closing mechanism that opens and closes the valve using the power source of the motor.
Has a reduction mechanism that increases the rotational force of the motor and reduces the rotation speed, and has a button that releases a release mechanism that slides and releases part of the connection of the reduction mechanism by meshing the gear, and opens and closes the valve Has a valve coupling mechanism that transmits the driven shaft and the driving force of the electric motor,
Have a release button near the valve joint mechanism,
The valve joint mechanism has a manually operated opening / closing arm that can manually open and close the valve while pressing the release button,
The valve joint mechanism is made of metal or resin casting,
When an abnormal force is applied, a part of the valve joint mechanism is destroyed and the driving force cannot be transmitted to the valve opening / closing shaft, thereby protecting the entire valve switch mechanism.
An electric valve opening / closing mechanism characterized in that the valve opening / closing function can be recovered by replacing the manual opening / closing joint.   The drive shaft and the valve opening / closing shaft of the electric valve opening / closing mechanism according to claim 1 are round shafts, and the tip of the round shaft has a shape having two parallel cuts, and the inner diameter shape of the manual opening / closing joint is: The drive shaft and valve opening / closing shaft can be fitted, and the drive shaft has a bearing part and the outer shape of the drive shaft.The drive shaft insertion part is a concentric space radially connected to the outer periphery by a plurality of ribs. It has an arm-shaped protrusion on the outer periphery, while the insertion part of the valve opening / closing shaft has a shape with two cuts parallel to the inner diameter, and its outer shape is thin and has a round bar shape. A valve opening and closing mechanism.