JPS6120372Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an electric valve that opens and closes the valve by rotating the rotating shaft for opening and closing the valve by driving a motor, and automatically opens the valve when a power outage occurs. This invention relates to an emergency closing device for an electric valve.

Generally, in this type of electric valve, when the motor is stopped, a brake mechanism installed inside the motor prevents the valve vanes from rotating due to the pressure of the fluid passing through the flow path. The rotating shaft of the rotating shaft is 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 or closed, the valve remains in the state it was in before the energization was cut off, so there is no risk of overflow. The sex was hot. For this reason, in the past, lifeguards manually closed the valves as soon as an accident occurred, but it is nearly impossible to control multiple valves in a short period of time, and there is a risk of forgetting to close them and causing an overflow. The disadvantage was that several observers had to be stationed at all times.

However, in order to eliminate and solve the above-mentioned drawbacks, the present invention provides an electric valve including a rotating shaft 2 for controlling the opening and closing of the valve A in a casing 1 and a motor 3 for driving the rotating shaft. A gear 4 that rotates by the drive of the motor 3 is fitted loosely into the gear 4, and gears ₅ ... ₅ that mesh with the gear and rotate are pivoted to a flange ₂₁ provided in the middle of the rotating shaft 2, A ring provided with teeth 6 ₁ ... 6 ₁ on the inner circumference that mesh with the gears 5 ... 5 and teeth _{6 2} ... 6 ₂ on the outer circumference that mesh with the worm gear 7 extending in a direction perpendicular to the rotating shaft 2. A spiral gear 6 is fitted with the gears 5...5 so that the gears 5...5 are fitted therein, and a spiral spring 8 provides a driving force to the rotating shaft ₇₁ of the worm gear 7 to rotate the valve A in the direction in which the valve A is closed. The rotating shaft ₇₁ is clamped and fixed to prevent its rotation, and is characterized by a structure in which an electric clutch 9 is provided which releases this rotation blocking action when the power supply is cut off.

In the figure, reference numeral ₃₁ denotes a gear integral with the rotating shaft of the motor 3, which meshes with the gear 41, which is integral with the gear ₄ , to transmit the rotational force of the motor 3 to the gear 4. 8 ₁ is a handle for winding the mainspring spring 8 .

Next, in accordance with the above configuration of the present invention, the specific usage, operation, and effects of the present device will be explained with respect to the illustrated embodiment.

That is, in a normal state, when the motor 3 is energized and driven, the gear ₄₁ that meshes with the gear 3 that is integrated with the rotating shaft of the motor 3 rotates, and the gear 4 that is integrated with this rotates. Therefore, gears 5...5 that mesh with this gear 4 begin to rotate, but this gear 5...
5 is in mesh with the teeth 6 1 ... 6 ₁ on the inner peripheral surface of the gear 6, which is prevented from rotating by meshing with the teeth 6 _. . . 6 ₂ on the outer peripheral surface of the worm gear 7. Therefore, the rotating shaft 2, which is integral with the pivot parts 5 ₁ ... 5 ₁ , rotates while rotating around the pivot parts 5 ₁ ... 5 ₁ . Thus, the vane of valve A opens and closes.

Therefore, if the motor 3 becomes unable to be energized due to an accident such as a power outage, the rotating shaft of the motor 3 will be unable to rotate due to the brake mechanism inside the motor.
At the same time that electricity is no longer applied, the electric clutch 9 releases the clamping fixation of the rotating shaft ₇₁ of the worm gear 7, and the rotating shaft ₇ is rotated by the restoring force of the spiral spring 8 that has been wound by rotating the handle 81 in advance. ₁ , that is, the worm gear 7 begins to rotate. As the worm gear 7 rotates, the gear 6 that meshes with the teeth 6 ₂ ... 6 ₂ on the outer peripheral surface rotates, and at the same time, the gears 5 ... 5 that mesh with the teeth 6 ₁ ... 6 ₁ on the inner peripheral surface begin to rotate. Since the gear 4 that meshes with the motor 3 is in a non-rotatable state as described above, the gears 5...5 revolve around the outer periphery of the gear 4 while rotating, and the rotating shaft 2 is connected to the motor 3.
It rotates independently of the valve A and closes the vane of valve A.

After energization is resumed, the rotating shaft ₇₁ of the worm gear 7 is prevented from rotating by the electric clutch 9, so the spiral spring 8 is wound by rotating the handle ₈₁ in preparation for the next time the energization is disabled.

As described above, according to the electric valve emergency closing device according to the present invention, normal valve opening/closing control is performed by driving the motor, and when electricity cannot be supplied due to a power outage etc., the restoring force of the spring spring is stored in advance. The worm gear is rotated by the worm gear, and the shaft of the valve is rotated so that the valve closes independently of the motor, so the valve automatically closes as soon as the power is cut off during a power outage. Therefore, in the event of a power outage, it is possible to temporarily shut off the entire flow path to prevent overflow, and there is no need for workers to close the valves one by one, unlike in the past, and there is no need to forget to close them. This completely prevents accidents such as overflow.

In this embodiment, the spiral spring is wound manually, but if a motor and a timer are combined and the winding is driven by the motor after the power is restarted, the worker can wind the spiral spring after the power is restarted. This saves time and effort and can be managed completely automatically.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a front view of an electric valve equipped with the proposed device, FIG. 2 is a side view of the same, FIG. 3 is a vertical side view of the same, and FIG. FIG. 1... Casing, 2... Rotating shaft, 3... Motor, 4, 5, 6... Gear, 7... Worm gear,
8... Spring spring, 9... Electric clutch.

Claims (1)

[Scope of utility model registration request] In an electric valve that includes a rotating shaft 2 for controlling the opening and closing of a valve A in a casing 1 and a motor 3 for driving the rotating shaft, a gear 4 that is rotated by the drive of a motor 3 is loosely fitted onto the rotating shaft 2. , gears 5...5 that rotate in mesh with the same gears are pivoted to a flange ₂₁ provided in the middle of the rotating shaft 2, and teeth ₆ that mesh with the gears ₅ ...5 are provided on the inner circumferential surface. ₁ ...6 ₁ , and a ring-shaped gear 6 provided with teeth 6, ₂ ...6 _{, 2} on the outer peripheral surface that mesh with the worm gear 7 extending perpendicularly to the rotating shaft 2, respectively, so as to incorporate the gears 5...5. A spiral spring 8 is fitted and applies a driving force to the rotary shaft ₇₁ of the worm gear 7 to rotate the valve A in the direction in which the valve A is closed, and a spiral spring 8 prevents rotation of the rotary shaft ₇₁ when energized, and when the energization is cut off. An electric clutch 9 that releases this rotation blocking effect
An electric valve emergency closing device comprising: