JPS639786A - Motor-driven valve - Google Patents

Abstract

PURPOSE:To reduce holding electric power while still maintaining a fail-safe condition by directly holding the output shaft of an electric motor by means of a valve opening holding means for holding a valve disc position on receipt of an electric signal. CONSTITUTION:In a valve closed condition, a valve spindle 14 is energized by the force of a spring 4 in the closing direction, and a valve spindle stopper 17 abuts against a fixing stopper 16, and so a valve disc 3 is in the fully closed position. When a switch 9 is on, a power source is input in a electromagnet 7, a moving iron 31 is adsorbed downward thereto the engaging protrusion 30 of a locking means 8 consisting of laminated spring members is locked with the projecting part 28 of the output shaft 6 of an electric motor, and the rotation of the output shaft 6 is regulated. Accordingly, a valve opening condition is held and electric power consumption is limited to that of only a electromagnet.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric valve for controlling water, air, oil, steam, and various other fluids, and in particular to an emergency shutoff valve in which the valve body returns to a safe position in the event of a power outage. This invention relates to an electric valve with the function of a valve or an emergency release valve, and is used as a safe and fail-safe process control valve in the automatic control field.

[Conventional technology]

Conventional electric valves, as disclosed in Japanese Patent Publication No. 53-12692, generally control the opening and closing of a valve element that opens and closes a fluid flow path using the output torque of an electric motor. If a power outage occurred while the valve body was being driven, the valve would stop at an intermediate opening, making it impossible to achieve fail-safe process control.

To solve this problem, an electric valve has been proposed that is equipped with a spring that urges the valve body to a safe position and a valve opening holding means that maintains the opening of the valve against the force of the spring. However, there was a problem with the durability of the locking member of the valve opening holding means. In other words, conventional locking members were constructed with ratchets or the like for the reduction means (gears, etc.) of the electric motor, so the rotational torque was large, and the ratchet and ratchet gear deteriorated quickly.In order to improve durability, it was necessary to This has the drawback of increasing the size, making it expensive.

In addition, since the electric input to the motor and the electric valve opening holding means was switched using two switches, if one switch malfunctioned, for example, the electric input to the motor and the electric valve opening holding means was changed. Inputs are performed simultaneously, which has the drawback of causing overheating and burning of the electric motor or damage to the locking member.

[Problem that the invention seeks to solve]

The present invention was proposed in order to improve these conventional drawbacks, and its purpose is to provide a fail-safe, small-sized, and compact motor-operated valve that requires less power and is durable. be.

A second object is to provide an electric valve that, in addition to the above-mentioned object, can selectively input electricity to the electric motor and the electric valve opening holding means, thereby preventing an accident of simultaneous energization of both. .

[Means for solving problems]

In order to achieve the above object, the present invention includes an electric motor 1 that receives electrical input and generates rotational force, a deceleration means 2 that reduces the rotational speed of the output shaft of the electric motor and increases output torque, and A valve body 3 that is fixed to the output shaft and controls the opening and closing of the fluid flow path, a spring 4 that always biases the valve body to a safe position, and a valve opening that maintains the opening degree of the valve against the force of the spring. In the motor-operated valve equipped with a holding means, the valve opening holding means 5, which receives an electric signal and holds the valve body position, is configured to directly hold the output shaft 6 of the electric motor. Further, the second invention further has the additional feature that electrical input to the valve opening degree holding means and the electric motor can be selectively performed by a single switch 9.

[Effect]

The deceleration means increases the output torque of the electric motor and transmits the rotating torque of the valve body, and the valve body is always urged to the safe position by the spring, but the valve opening holding means resists the force of the spring. It maintains the opening at a constant position and receives an electrical signal to directly hold the output shaft of the motor. Further, the switch 9 provides electrical input to either the electric motor or the valve opening holding means.

〔Example〕

An embodiment of the present invention will be explained with reference to FIGS. 1 to 7.
A fluid passage communicating from the fluid inlet 11 to the fluid outlet 12 passes through the inside of the valve body IO, and a pole-shaped valve body 3 for controlling opening and closing of the fluid passage is arranged to be slidable on the valve seat 13. This constitutes a pole valve. The valve stem 14 fixed to the valve body 3 is rotatably arranged with respect to the valve body 1o and the actuator body 15, and is always urged to a safe position by the spring 4 and is pressed against the fixed stopper 16. Then, the valve stem stopper 17 comes into contact and stops at the safe position.

In the case of an emergency shutoff valve, the safe position is closed, and the safe position of an emergency release valve is fully open.
The valve is shown in the fully closed position. On the other hand, the fourth gear 18 fixed to the valve stem 14 meshes with the first gear 21 fixed to the output shaft 6 of the electric motor 1 via the third gear 18 and the second gear 20. The third gear 13 is made up of a large gear 22 and a small gear 23 and is arranged rotatably about a gear shaft 24, and the second gear 20 is made up of a large gear 25 and a small gear 2B that are integrated. The gear shaft 27 is arranged so as to be rotatable about the gear shaft 27. 1st
Gear 21. Second gear 20, third gear 19. Fourth gear 18
is disclosed as an embodiment of the speed reduction means 2, which reduces the rotational speed of the output shaft 6 of the electric motor 1 to increase the rotating torque acting on the valve stem 14, and includes a chain belt, a pulley,
It can be replaced with a worm gear, etc.

A disc portion 29 having a protrusion 28 on the circumference is integrally formed on the output shaft 6 of the electric motor 1, and the locking means 8 of the valve opening holding means 5 is arranged in correspondence with the protrusion 28. ing. In the embodiment, the locking means 8 is made of a plate spring member, and has an engaging protrusion 30 arranged on a part of the circumference.

Further, an electromagnet 7 is disposed above the locking means 8, and the movable core 31 is always pressed upward by the leaf spring force of the locking means 8. The switch 9 fixed to the actuator main body 15 is turned on and off according to the rotation of the valve stem 14, that is, the open/closed state of the valve body 3 (in the embodiment, a notch 32 is arranged in a part of the valve stem 3). . The electric motor 1 and the electromagnet 7 are connected to the power source 3 via a double contact operation switch 33 and a switch 9.
4 is connected and wired.

The operation of the embodiment will be explained with reference to FIGS. 1 and 2.

FIG. 3 shows the valve closed state with the operating switch 33 open, and FIGS. 4, 5, 6, and 7 show the valve open state with the operating switch 33 closed. Operation switch 33
When it is open, the valve stem 14 is urged in the closing direction by the force of the spring 4, and the valve stem stopper 17 abuts against the fixed stopper tS, so that the valve body 3 is in the fully closed position. When the operation switch 33 is closed, power is input only to the electric motor and the valve stem 14
rotates in the direction of arrow A in FIG. When the roller of the switch 9 enters the notch 32 as shown in FIG. 4, power is input to the electromagnet 7 as shown in FIG. The engagement projection 30 of the locking means 8 is locked with the projection 28 of the output shaft 6 of the electric motor, and rotation of the output shaft 6 is restricted, so that the valve is maintained in the open state. In this state, the power consumption is only for the electromagnet, and the large power consumption of the electric motor is not required, so it is possible to provide an electric valve with low holding power.

Next, when the operation switch 33 is opened or when a power outage occurs, the power supply to the electromagnet 7 is cut off, and the movable iron core 31 also moves upward by the leaf spring force of the locking means 8, and the engagement protrusion 30 engages with the protrusion 28. is disengaged, the valve stem 14 is rotated in the direction of arrow B in FIG. 4 by the force of the spring 4, the valve returns to the closed state, and the switch 9 also switches its contact to the electric motor side. Therefore, a fail-safe emergency shutoff valve is provided, and since the switch 9 selectively energizes the electric motor and the electromagnet, there is no risk of overheating or damage to the locking means.

Further, since the engaging means is arranged to directly engage the output shaft of the electric motor, only the smallest rotational torque acts on the reducing means, allowing for a smaller size and improved durability. In addition, in the embodiment, the valve opening degree holding means is particularly made compact using a leaf spring member and an electromagnet.

It can be provided at a low cost, and the switch 9 is also inexpensive with only one piece.

Note that the present invention is not limited to the ball valves of the embodiments, but can be applied to butterfly valves, disc valves, diaphragm valves, swing valves, and the like.

〔Effect of the invention〕

INDUSTRIAL APPLICABILITY The present invention enables the realization of a small, inexpensive electric valve that is fail-safe, has low power consumption, is excellent in durability, and has particularly excellent effects in reducing the size of the locking means and improving durability. Further, the accident of simultaneous energization of the electric motor and the electric locking means is completely prevented, and there is an effect that burnout accidents and accidents of damage to the engaging means do not occur.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the electric valve of the present invention, FIGS. 2 and 4 are explanatory diagrams showing the operating state of the switch 9 shown in FIG. 1, and FIGS. Operation circuit diagram in Figure 1, Figure 6,
FIG. 7 is an explanatory diagram showing the operating state of the engaging means shown in FIG. 1. 111. electric motor, 290. Reduction means, 301. Valve body, 418. Spring, 506. Valve opening holding means,
619. Output shaft, 700. Electromagnet, 899. locking means, 900. switch. Voice 7 G Mezf) /$men8 N3/27]ζr'-.

Claims (3)

[Claims] (1) An electric motor that generates rotational force in response to electrical input, a deceleration means that reduces the rotational speed of the output shaft of the motor and increases the output torque, and a deceleration means that is fixed to the output shaft of the deceleration means and that creates a fluid flow path. In a motor-operated valve equipped with a valve body that controls opening and closing, a spring that constantly urges the valve body to a safe position, and a valve opening degree holding means that maintains the valve opening degree against the spring, an electric signal is transmitted. The valve opening holding means for holding the valve body position is an electric valve that directly holds the output shaft of an electric motor. (2) The electromagnetic valve according to claim 1, wherein the valve opening holding means includes an electromagnet and a locking means made of a plate spring member. (3) an electric motor that generates rotational force in response to electrical input; a deceleration means that reduces the rotational speed of the output shaft of the motor and increases output torque; In a motor-operated valve equipped with a valve body that controls opening and closing, a spring that constantly urges the valve body to a safe position, and a valve opening degree holding means that maintains the valve opening degree against the spring, an electric signal is transmitted. The valve opening degree holding means for holding the valve body position directly holds the output shaft of the electric motor, and the electric motor is operated by selectively inputting electricity to the valve opening degree holding means and the electric motor with a single switch. valve.