JPS6263280A - Motor-operated valve - Google Patents

Abstract

PURPOSE:To enable the valve body of a valve to be opened and closed to the safety side during a power outage, by a method wherein the rotation force of a motor, with the aid of which the valve of the valve is opened and closed, is accumulated in a flat spiral spring. CONSTITUTION:An output from a reversible motor 3 is transferred through an internal gear 4, and gears 5, 7, 6, and 10 to a spiral flat spring 10. When the resilient restoring force of the spiral flat spring 10 is increased to a specified value, a shaft 8, supported to a crank 9 provided at both ends with gears 5 and 7 and secured integrally with an output shaft, is moved in a direction, in which an output shaft 2 is rotated, centering around the gear 6 serving as a fulcrum. In this case, even when the motor 3 is stopped, restoration of the spiral flat spring 10 is checked by a latchet mechanism 11. When, with this state, driving of the motor 3 is rendered ineffective due to a power outage, with the latchet mechanism released, the crank 9 secured to the output shaft 2 is reversed around a motor shaft 3 serving as a fulcrum through the restoration force of the spiral flat spring 10, and a valve body coupled to the output shaft 2 can be opened and closed to the safety side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric valve whose valve body is rotated by a reversible rotary motor to open and close the valve. This invention relates to an electric valve that has a built-in mechanism that automatically opens or closes the valve when the valve is opened or closed.

Conventionally, there are electric valves in which the valve body is rotated by a motor to open and close the valve.
In general, this type of electric valve uses a brake mechanism installed inside the motor to prevent the valve body from rotating due to the pressure of the fluid passing through the flow path when the motor is stopped. is configured to be fixed in a non-rotatable manner.

Therefore, if the motor is no longer energized due to a power outage or some other accident, and the valve cannot be opened/closed, the valve body remains in the same state as before dialysis. There was a risk that the tank would overflow if it became incapable of energizing in an open state. For this reason, in the past, supervisors manually closed the valves as soon as an accident occurred, but it was nearly impossible to control multiple valves in a short period of time, and it was not reliable as people sometimes forgot to close them. .

Therefore, a device was devised in which the valve was automatically closed by switching K using an electromagnetic clutch using the restoring force of a manually wound spiral spring.
This requires manually winding the spring spring in advance, which is not only time-consuming but also involves the risk of forgetting to wind it.Furthermore, it requires an expensive electromagnetic clutch.
It has the drawback of being extremely expensive to manufacture, and is currently not in practical use.

However, the present invention eliminates the above drawbacks and provides a practical electric valve with a built-in emergency closing device.
In an electric valve in which the output shaft 2 connected to the rotating shaft of the valve body of the valve 1 is rotated 90 degrees in the forward and reverse directions by the drive of the reversible rotary motor 3 to open and close the valve 1, the motor 3 An internal gear 4, which rotates independently of the output shaft 2 due to rotation, is pivotally supported on the output shaft 2, and a gear 5 meshing with the internal teeth 4□...4□ of the internal gear 4, and the output shaft 2 are connected to each other. A gear 6 that is pivotally supported on the square shaft 2 and rotates independently of the output shaft.
A shaft 8, which has a gear 7 fixed to both ends thereof, is rotatably inserted into a hole 91 formed in a part of a crank 9, which is fixed integrally to the output shaft 2, and the gear 6 rotates in one direction. The present invention is characterized in that it is provided with a spiral spring 10 that is wound by a spiral spring, a ratchet mechanism 11 that prevents reverse rotation of the spiral spring, and a solenoid 12 that releases the locking action of the ratchet mechanism.

Note that the spiral spring 10 is connected to a gear 101 that meshes with the gear 6.
The inner end piece is fitted into a slit bored in the shaft 102 that is integral with the valve 1, and the outer end piece is fixed to the flange portion of the valve 1 and fixed to a part of the casing A that covers the entire device. It is wound by 60 rotations, and multiple pieces are provided as necessary to increase the restoring force.

The ratchet mechanism 11 also includes a ratchet gear 112 that is integral with a gear 111 that meshes with the gear 6, and a ratchet pawl 11 that meshes with the ratchet gear 112. And this is always ratchet gear 1
12, and a spring 114 that urges the ratchet pawl 11.12 in the direction of engagement with the ratchet pawl 11. is configured to be rotated in the engagement release direction via the rotating shaft 16. Further, the lower end of the output shaft 2 is fitted into a hole at the upper end of a rotating shaft (not shown) of the valve body of the valve 1, so that the rotating shaft of the valve body rotates together with the output shaft 20 rotations. A cam 14 fixed near the lower end of the output shaft 2 and a stopper 15 facing inward from the outside of the lower end of the casing are configured to allow forward and reverse rotation within a range of 90 degrees. In the figure,
Reference numeral 16 denotes a limit switch that detects the rotation of the output shaft 2 and sends an electrical signal indicating whether the valve 1 is open or closed. The contact is set to turn ON and OFF. Also, 6. is a toothed wheel integrated with the rotating shaft of the motor 3, which meshes with the outer peripheral teeth 41...42 of the internal gear 4, and rotates the internal gear 4 by driving the motor 3, and constitutes a reduction mechanism. There is.

Next, in accordance with the above configuration of the present invention, the specific usage, operation, and effects of the electric valve of the present invention will be explained with reference to the illustrated embodiments.
The case where the valve is closed during a power outage will be explained.

That is, in the energized state in which the valve 1 can be controlled by the motor 6, the excitation coil of the solenoid 12 is always energized, and the extended end of the plunger 12z protrudes, so that the ratchet pawl 11 engages with the ratchet gear 118. However, the ratchet gear 112, that is, the gear 6, is in a state where rotation in only one direction is allowed. In this state, when the motor 3 is driven so that the motor 6 rotates in the direction in which the valve body of the valve 1 is closed, the internal gear 4 is rotated in the direction of the arrow by the rotation of the gear 61 that is integrated with the rotating shaft. Since the integrated gear 7 rotates in the direction of the arrow via the gear 5 and shaft 8 that mesh with the inner circumference 1li14□-4□ of the thread,
The gear 6 and the gear 10 □ meshing with the gear 7 also rotate integrally, and the spiral spring 10 begins to be wound.
When the torque of □, that is, the torque of the gear 6 increases, the gear 7 that meshes with it will perform a so-called planetary motion in which it revolves around the gear 6 while rotating on its own axis. When pushed, the crank 9 turns in the direction of the arrow, and the output shaft 2 integrated with the crank 9 rotates, so that the valve body of the valve 1 rotates in the opening direction. When the valve body opens and closes due to this rotation, further rotation is prevented by the action of the stopper 15, and at the same time, the power to the motor 3 is cut off by the action of the limit switch 160, and the motor 3 is stopped. When the contacts of another switch connected in parallel are closed and the motor 3 is energized, the output shaft 2 is in a fixed state where it cannot rotate any further in the closing direction, so the rotation of the gear 61 of the motor 6 is stopped. That is, the internal gear rotates 40 times, causing the gear 5 or gear 7 to rotate again.
In order to rotate the gear 6, it is further wound around the spiral spring 10. When the mainspring spring 10 is fully wound, the motor 6
When the power is cut off and the motor 3 is stopped, the ratchet mechanism 11 prevents the spiral spring 10 from unwinding, so the spiral spring 10 is held in the pressure-accumulating state.

In this pressure accumulation state, the gear 6 is in a fixed state, so when the motor 6 is energized in the opposite direction and the gear 6 is rotated in the reverse direction, the internal gear 4 and the gears 5, 7
rotates in the opposite direction, and the gear 7 rotates in a planetary manner in the opposite direction to the above-mentioned direction to rotate the crank 9 in the opposite direction, so that the output shaft 2 rotates 90 degrees and opens the valve body of the valve 1. Simultaneously with the opening of the valve body, the motor 3 is activated by the action of the limit switch 160.
The energization is cut off, and the motor 6 stops. Thereafter, the above-mentioned operation is repeated by driving the motor 3 to open and close the valve 1.

Therefore, if an accident such as a power outage occurs in which the valve 1 is opened and the motor 3 cannot be energized, the energization to the solenoid 12 will naturally be cut off, so the magnet will be attracted to the excitation coil. The extended end of the plunger 12 □, which had been pushed back, is moved back by the restoring force of a strong spring installed inside the solenoid, and the ratchet pawl 111 is rotated in the direction of the arrow to release the engagement with the ratchet gear 112. The gear 6 becomes free. When the gear 6 becomes free, the gear 6 rotates in the direction opposite to the direction in which the spiral spring is wound due to the restoring force, that is, the unwinding force, of the spiral spring 10, that is, in the direction of the dotted arrow. However, when the motor 6 is stopped, the rotation shaft of the motor 30, that is, the gear 31 is in a fixed state, and the internal gear 4 is also in a fixed state, so the gear 5 is rotated in the internal direction. Zhou fit41...41
The crank 9, that is, the output shaft 2, is pushed by the shaft 8 and rotates in the direction of the solid line arrow, that is, in the direction of opening and closing the valve 10 mentioned above, and the valve body is automatically locked (e). .

If the shaft 102 that winds the mainspring spring 10 rotates in the unwinding direction, it can be detected and a signal will be emitted, and this signal can be used to display that the mainspring spring needs to be wound after the power is restarted, or when the power is restarted. Afterwards, the motor 6 can automatically wind the spiral spring.

As described above, according to the electric valve according to the present invention, the spiral spring is wound using the motor that controls opening and closing of the valve, and the spiral spring is turned off when it becomes impossible to control the energization of the motor, such as during a power outage. Since it is designed to unwind the valve body to open 18 chains, it does not require the troublesome work of manually winding a spring spring, and does not require an expensive electromagnetic clutch, so it can be used in emergency situations at a very low cost. , it is possible to provide an electric valve with a built-in closing device.

In this embodiment, the case where the valve is closed in an emergency such as a power outage has been described, but when used as a sprinkler valve, the valve may be opened when the energization cannot be controlled such as during a power outage. If t'L is not necessary, the mounting position of the stopper cam may be changed so that the spring is wound when the valve is opened.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a side view of the electric valve of the present invention, FIG. 2 is a vertical #i side view of the drive section of the electric valve, and FIG. It is a perspective view showing a mechanism. DESCRIPTION OF SYMBOLS 1...Valve, 2...Output shaft, 6...Reversible synchronous motor, 4...Internal gear, 5.6.7...Gear, 8...Shaft, 9... Crank, 10 River spring spring, 11...Ratchet mechanism, 12...Nlenoid Applicant: Kawaden Equipment Manufacturing Co., Ltd. Figure 2, Figure N3

Claims (1)

[Claims] In an electric valve in which the output shaft 2 connected to the rotating shaft of the valve body of the valve 1 is rotated 90 degrees in the forward and reverse directions by the drive of the reversible rotary motor 3 to open and close the valve 1, the motor 3 An internal gear 4, which rotates independently of the output shaft 2 due to rotation, is pivotally supported on the output shaft 2, and a gear 5 meshes with the internal teeth 4_1...4_1 of the internal gear 4, and the output shaft 2. A shaft 8, which has gears 7 fixed to both ends that mesh with a gear 6 which is pivotally supported by the output shaft and rotates independently of the output shaft, is attached to a hole 9 drilled in a part of a crank 9 which is integrally fixed to the output shaft 2.
A spiral spring 10 is rotatably inserted into the gear 6 and wound by rotation of the gear 6 in one direction, and a ratchet mechanism 11 prevents reverse rotation of the spiral spring, and a solenoid 12 releases the locking action of the ratchet mechanism.
An electric valve characterized by being provided with.