JPH0535260Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric actuator that opens and closes a valve, in which the degree of opening of the valve can be easily confirmed.

[Prior Art] An electric operating machine that opens and closes a control valve used for air conditioning etc. adjusts the opening degree of the valve depending on a set temperature, etc. even when the valve is at an intermediate opening degree other than fully open or fully closed. In electric actuators used for such applications, the movement of the output shaft is small, so it is difficult to tell whether the electric actuator is working properly or not, and it is necessary to be able to check the opening degree of the valve from the outside.

For this reason, the present applicant filed the fourth patent application in Utility Model Application No.
We have devised and disclosed an automatic valve with an opening indicating structure shown in Figs. This involves installing a yoke 3 between the actuator 4 and the valve box 1, connecting the output shaft 6 of the actuator 4 and the valve stem 2 via a socket 8, and providing an indicator 7 in the socket 8 to control the yoke 3. Rotation is instructed on the valve box side flange 5.

In addition, in Utility Model Application No. 54-45426, a cylindrical rotating body is provided on the worm wheel shaft that opens and closes the valve, and a cover with a window is attached to surround this rotating body.
A valve opening/closing display device is disclosed in which a scale representing opening/closing of the valve is displayed on the rotating body so that opening/closing of the valve can be identified even from a distance.

[Problems to be solved by the invention] In the former of the above conventional techniques, an opening degree display is provided between the valve box 1 and the actuator 4, and the opening degree display is visible only from above the indicator 7. Because there is no
The actuator 4 at the top of the opening was an obstacle, making it difficult to confirm the exact opening degree. Furthermore, when used for air conditioning, hot water supply, etc., the valve box 1 is surrounded by a heat insulating material for heat insulation and dew prevention purposes, making it impossible to check the opening degree display provided on the valve box. Furthermore, valve box 1 and actuator 4
Since an open portion is provided between the actuator 4 and the opening degree to be displayed, there is a problem that dirt or water droplets may enter the inside of the actuator 4, causing corrosion or malfunction.

In addition, with the latter conventional technology, even if the opening degree can be confirmed from a certain distance, in a dimly lit place or at night, it is difficult to know whether the valve is operating to the open side or to the closed side. The problem is that it is difficult to identify. Even if lights were to be installed, this would require additional equipment, which would be inconvenient.

The present invention provides an opening display device for an electrically operated valve that solves the above problems.

[Means for Solving the Problems] The gist of the present invention is to provide an output shaft that opens and closes a valve using an electric motor or the like as a drive source, an interlocking shaft that rotates in conjunction with the output shaft, and an indication that indicates the degree of opening of the valve. Equipped with a scale,
A rotating drum attached to the interlocking shaft, a lamp that lights up while the output shaft rotates in the valve opening or closing direction, and a display window that allows you to confirm the display scale of the rotating drum and the lighting of the lamp from the outside. This is an opening degree display device for an electrically operated valve, characterized by comprising a cover.

[Operation] Since the present invention has the above-mentioned configuration, as the output shaft rotates, the disc-shaped rotary drum that displays the opening degree of the valve rotates, and the display scale of the rotary drum can be read from the outside through the display window of the cover. This allows you to check at a glance the opening degree of the valve during use.

At the same time, a lamp is lit while the output shaft is rotating, for example, a green lamp is lit when the output shaft is rotating toward the closing side of the valve, and a green lamp is lit while the output shaft is rotating toward the opening side. When the valve is in operation, a red lamp lights up, so you can see at a glance whether the valve is open or closed, even from a distance or at night.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a developed cross-section showing one embodiment of the present invention, in which an output shaft 10 is rotated from a drive shaft 21 of an electric motor 20 through gears 1 to 6 at a torque and rotation speed suitable for opening and closing a valve, and a lower part The valve stem of a fixed valve (not shown) is driven. Dog 1 is attached to the output shaft 10.
1 and 12 are attached, and when the valve is fully open or fully closed, the dog operates limit switches 13 and 14 to stop the electric motor 20. A gear 7 is attached to the output shaft 10, and a drum 31 attached to the interlocking shaft 30 rotates via the gear 7. An opening degree display scale 32 corresponding to the opening degree of the valve of the output shaft 10 is displayed on the outer peripheral surface of the drum 31. Further, a potentiometer or rotary encoder 33 connected to an interlocking shaft 30 is mounted on a plate substrate 40 on the upper part of the drum 31, and is interlocked with the rotation of the drum 31. This potentiometer 33 serves to electrically detect the opening degree of the valve and send an electrical signal to the control section of the circuit configured on the printed circuit board 40, so that the opening degree of the valve is adjusted to the opening degree set by the control section. The electric motor 20 is driven until the Reference numeral 50 denotes a cover that surrounds the entire electric operating machine and prevents dirt and water droplets from entering the electric operating machine and protects it from the outside. The drum 31 is installed at a corner of the out-of-plane shape formed by the cover 50, as shown in FIG.
The display scale 32 of the drum is positioned equidistantly from 1,502. In addition, window frames are pre-formed at two locations on the cover surfaces 501 and 502 near the display scale 32 of the cover 50, and since it may be difficult to see depending on the location of the valve piping, display using the window frame in the optimal direction. A window 51 is formed. The other window frames are usually closed and the display window 51 is opened using this.
When changing the display window by 90 degrees, the direction of the display window can be changed by 90 degrees by simply changing the drum 31 by 90 degrees. The display window 51 is formed by a transparent plate 52 as shown in FIG.
The drum 31 is covered with a lid so that the display scale 32 displayed on the drum 31 can be easily checked from the outside. Also, an electric motor 2 is installed between the display scale 32 of the drum and the display window 51.
There are two lamps 41 on the left and right sides of the display window 51 that light up while the output shaft 10 is rotating.When the output shaft 10 rotates to the valve closing side, the green lamp 411 lights up, and when the output shaft 10 rotates to the valve opening side, the red lamp 411 lights up. A lamp 412 is arranged to be lit. Therefore, during operation, it is possible to check at a glance whether the output shaft is operating to open or close the valve, and what the opening degree of the valve is.
Also, depending on the location of the piping, the display window can be placed in the optimal position for confirmation.

In this embodiment, the gear ratio is selected so that the drum 31 and potentiometer 33 rotate 180 degrees as the output shaft 10 is rotated 90 degrees from fully open to fully closed, and the interlocking shaft 30 is provided. 31 and potentiometer 33 are installed, but the electric motor 2
For example, if the rotation of the gear 5 shown in FIG. 1 among the gear trains 1 to 5 that drive the output shaft 10 from 0 is within 360 degrees, the shaft 9 of the gear 5 interlocked with the output shaft 10 is A drum 31 may be attached to display the opening degree of the valve.

[Effects] As explained above, the electrically operated valve opening display device of the present invention has a valve opening display on the operating device itself, so it can be attached to any valve to display the valve opening and valve opening. The operating direction (open or closed) can be easily and accurately confirmed. Therefore, the valve can be insulated without any problems, maintenance is easy, and it can be used with peace of mind.

[Brief explanation of the drawing]

FIG. 1 is a developed cross-sectional view showing an embodiment of the present invention, FIG. 2 is a front view showing the display part of the cover 50 shown in FIG. 1, and FIG. 3 is a plan cross-sectional view showing the installation position of the drum 31 shown in FIG. 4 is a front view showing a conventional example, and FIG. 5 is a view taken along the line A-A' in FIG. 4. 10... Output shaft, 20... Electric motor, 21... Drive machine, 30... Interlocking shaft, 31... Drum, 32...
...Display scale, 33...Potentiometer, 41...
... Lamp, 50 ... Cover, 51 ... Display window, 5
2...Transparent plate.

Claims (1)

[Claims for Utility Model Registration] 1. An output shaft that opens and closes a valve using an electric motor or the like as a driving source, an interlocking shaft that rotates in conjunction with the output shaft, and a display scale that indicates the degree of opening of the valve, A rotating drum attached to a shaft, a lamp that lights up while the output shaft rotates in the valve opening or closing direction, and a cover provided with a display window that allows you to check the display scale of the rotating drum and the lighting of the lamp from the outside. An opening display device for an electrically operated valve, characterized in that: 2. In the scope of claim 1 of the utility model registration, the cover is approximately cubic or rectangular;
The display windows are provided on both planes forming the corner portions of the cover, the interlocking shaft to which the rotating drum is mounted is provided on the corner portions of the cover, and the display scale of the rotating drum is provided on both planes forming the corner portions. An opening display device for an electrically operated valve, characterized in that it can be checked from any direction.