JP3040270B2 - Electric valve with open / close indicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric valve with a so-called linear type open / close indicator, such as a diaphragm valve or a gate valve, which moves a valve body linearly by a rotating valve drive shaft.

[0002]

2. Description of the Related Art An electric valve with an open / close indicator of this kind is
The high-speed rotation of the electric motor is reduced and transmitted by a reduction mechanism consisting of a worm gear and a worm wheel to rotate the valve drive shaft, and the valve element screwed to the screw of the valve drive shaft is linearly inserted into the flow path in the valve box. The opening / closing state of the flow path is changed by moving in and out.

An open / close display for displaying the open / closed state of a valve or outputting information on the open / closed state to a remote control device or the like based on the rotation angle of a valve drive shaft for remote control and automation of valve open / close control. Increasing examples are provided.

[0004]

In the conventional electric valve with the open / close indicator having the above-mentioned structure, if the size is different, the valve element moving length required for fully opening and closing the flow path is different, and the necessary valve drive shaft is required. Are also different. Therefore, the open / close display that displays the open / close state of the flow path based on the rotation angle of the valve drive shaft also displays different open / close degrees for the same input rotation angle of the valve drive shaft depending on the size of the valve. By
It is configured to display the correct opening / closing degree.

However, the above-described configuration of the open / close display requires the provision of a different open / close display for each size, resulting in a problem that management is troublesome and a manufacturing cost is increased.
Also, when manually opening / closing at the time of a power failure or the like, it is necessary to make the judgment of the degree of opening / closing different for each size, and the judgment may be erroneous.

The present invention has been made to solve the above-mentioned problems of the prior art, and has an open / close display which can correctly display the open / closed state of a valve with the same open / close display even if the sizes are different. It is an object to provide an electric valve.

[0007]

SUMMARY OF THE INVENTION To this end, an electric valve with an on / off indicator according to the present invention includes an on / off indicator connected to a valve drive shaft, and transmits the rotation of the electric motor at a reduced speed to rotate the valve drive shaft. In a plurality of electric valves with an open / close indicator for allowing a valve element screwed to a screw of a valve drive shaft to enter and exit a flow path in a valve box, a screw of a valve drive shaft of each electric valve for screwing the valve element is a valve. It is an object of the present invention to achieve the above object by providing a screw lead for moving a valve element necessary for fully opening and closing a valve by the same angle rotation of a drive shaft.

[0008]

According to the above construction, the screw lead for screwing the valve body to the valve drive shaft of each electric valve fully opens and closes the flow path even if the electric valves are provided with open / close indicators of different sizes. Each of the electric valves is configured so that the movement of the valve element required for the rotation is performed by the rotation of the valve drive shaft at the same angle. If the rotation angle is input, the open / closed state of the valve can be correctly displayed.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric valve with an open / close indicator according to the present invention.

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a motor for driving a valve body. The high-speed rotation of the motor 1 is reduced to an intermediate speed by a speed reducer 2 that combines spur gears, and a reduction mechanism that combines a worm gear 3 and a worm wheel 4. The rotation of the valve drive shaft 5 is converted to a low-speed rotation and a high torque. A male screw is machined on the valve drive shaft 5, and a valve body (not shown) is screwed into the male screw. The valve body linearly moves into and out of the flow path of the valve box by the rotation of the valve drive shaft 5. The valve is opened and closed.

Reference numeral 6 denotes an open / close indicator for displaying the open / closed state of the valve, and a valve drive shaft 5 extending upward from the worm wheel 4.
A large gear (not shown) on the back surface of the opening display plate 8 is engaged with a small gear 7 attached to an extension shaft of the valve, and a pointer 9 indicates a rotation angle scale on the surface of the opening display plate 8, The open / close state can be read. Reference numeral 10 denotes a potentiometer which is connected to the rotation axis of the opening display plate 8 and electrically outputs information on the open / closed state of the valve.

The present embodiment is characterized in that the specifications of the male screw of the valve drive shaft 5 and the female screw of the valve element to be screwed thereto are the same type of electric valve with an open / close indicator.

For example, in the electric diaphragm valve with the open / close indicator of the present embodiment, the valve body stroke (fully closed / full open) of the valve size 25A is 12 mm, and the valve body stroke (fully closed / full open) of the valve size 50A is 27 mm. On the other hand, both valve sizes are 3
Valve stroke required by rotation (fully closed / fully open) 12
To move the valve body by 25 mm and 27 mm, the valve size 25A is a double screw, screw lead 4 mm
(Pitch 2mm) Valve size 50A is triple screw, screw lead 9mm
(Pitch: 3 mm).

With the above configuration, the high-speed rotation of the motor 1 is reduced to the intermediate speed by the speed reducer 2 combining spur gears,
The valve drive shaft 5 is rotated at a low speed and with a high torque by a reduction mechanism combining the worm gear 3 and the worm wheel 4.
And the valve body (not shown) screwed into the male screw of the valve drive shaft 5 linearly moves in and out of the flow path of the valve box to open and close the valve.

Then, the valve drive shaft 5 is connected to the worm wheel 4.
The rotation angle scale of the opening display plate 8 provided on the opening / closing display 6 extended and engaged above can be read to know the open / closed state of the valve, and connected to the rotation axis of the opening display plate 8. The information on the open / closed state of the valve can be electrically output from the potentiometer 10.

In addition, even if the size is different, the same display / output can be performed accurately by mounting the same open / close indicator 6.

[0017]

As described above, according to the present invention, the movement of the valve body required to fully open and close each valve is controlled by the valve drive shaft, even if the electric valves are provided with open / close indicators of different sizes. The screw lead for screwing the valve body to the valve drive shaft is configured so that the valve drive shaft can be rotated by the same angle of rotation. By inputting the rotation angle, the open / close status of the valve can be displayed correctly, and the valve can be opened / closed reliably.
In addition, a predetermined flow rate adjustment state can be set and maintained.

As described above, the same open / close display may be prepared even if the size is different, so that the management is simple and the manufacturing cost is reduced. It is also easy to correctly determine the open / closed state when manually opening / closing at the time of a power failure or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of one embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Reduction gear 3 Worm gear 4 Worm wheel 5 Valve drive shaft 6 Open / close indicator 7 Small gear 8 Opening display board 9 Pointer 10 Potentiometer

Claims (1)

(57) [Claims] An opening / closing indicator connected to a valve drive shaft;
In each of a plurality of electric valves for rotating the valve drive shaft by transmitting the rotation of the motor at a reduced speed and rotating the valve drive shaft, and allowing the valve body screwed to the screw of the valve drive shaft to enter and exit the flow path in the valve box, An electric valve with an open / close indicator, wherein a screw of a valve drive shaft of the electric valve has a screw lead for moving a valve element necessary for fully opening and closing the valve by the same angle rotation of the valve drive shaft. .