JPH0537108Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a controller such as a control valve used to control the flow rate and pressure of liquid or gas, especially a valve stem screwed into a valve body. This invention relates to an improvement in a mechanism for displaying the valve opening of a controller that adjusts the valve opening by rotating the valve stem.

[Conventional technology]

With conventional control valves, the amount of valve stem operation, that is, the valve opening cannot be directly determined, but can only be determined indirectly using a flow meter, pressure gauge, etc. That is, the operator:
Normally, the handle is operated while visually checking a meter such as a flow meter. In addition, in the case of a skilled person, it is possible to operate the valve opening degree accurately to a certain extent without visually checking the instrument, but ultimately confirmation using the instrument is required.

In addition, in order to directly display the valve opening degree, a small gear is fixed to the upper end of the valve shaft, and a large gear that meshes with the small gear is supported by a support shaft parallel to the valve shaft. Therefore, a device that directly displays the valve opening degree has been developed (such as Utility Model Application No. 173884/1984). However, all conventional controllers with a valve opening display function have extremely large display mechanisms, making it difficult to downsize the controller.

[The problem that the idea aims to solve]

This invention enables valve opening control by handle operation.
It is an object of the present invention to provide a controller that can be easily and accurately operated without visually checking a pressure gauge or other gauge, and has an extremely compact valve opening display mechanism.

[Means to solve the problem]

The present invention provides a controller in which a valve stem is screwed into a valve body and the valve opening degree is adjusted by rotating the valve stem, and a valve operating handle that is rotatably disposed relative to the valve stem. A rotation force transmission mechanism is provided between the valve stem and the valve stem to transmit the rotational operating force of the handle to the valve stem, and further,
A counting mechanism for counting the amount of rotation of the valve stem is incorporated into the inside of the handle, and the handle is formed into a cylindrical shape with a display window on the top surface and an operating gear on the inner peripheral surface of the lower part, and is eccentric to the valve stem. The handle is rotatably fitted and supported on the outer circumferential surface of a cylindrical support fitted to the valve body so as to be slidable in the axial direction of the valve stem, and the rotational force transmission mechanism is mounted below the handle. The counting mechanism is formed of an operating gear formed on the inner circumferential surface of the part, and an operating gear that meshes with the operating gear and is fitted onto the valve stem, and the counting mechanism is inserted through a non-meshing part between the operating gear and the operating gear. a frame body that protrudes upward and has its lower end fixed to the upper surface of a support; a two-stage gear that is pivotally supported by the frame body and is rotationally driven by meshing with a meshing portion of the operating gear; and a display body that is rotatably driven by the two-stage gear, and the display body is displayed from the handle display window, so that the amount of rotation of the valve stem can be visually detected. This is the basic structure of the idea.

[Effect]

When the handle is rotated, the valve stem is rotated via the rotational force transmission mechanism.

At this time, the amount of rotation of the valve stem is displayed on the display window of the handle by the display section of the counting mechanism.

Therefore, the valve opening degree can be controlled accurately without using a meter such as a flow meter.

〔Example〕

Hereinafter, the structure of the present invention will be specifically explained based on the embodiments shown in FIGS. 1 to 4. This embodiment relates to an example in which the present invention is applied to a needle type control valve.

In the control valve as a controller shown in FIG. 1, 1 is a valve box, 2 is a valve operating handle, 3 is a valve stem that is instructed to be screwed into the valve box 1, and 4 is an intervening device between the handle 2 and the valve stem 3. The rotational force transmission mechanism 5 is a counting mechanism built into the handle 2.

As shown in FIG. 1, the valve body 1 has a valve stem support cylinder 1a erected through which the valve stem 3 is inserted and supported, and a nut-shaped lid 6 is screwed onto the valve stem support cylinder 1a. ing. A support body 7 is fitted and held in the lid body 6 by spline means or the like so as to be slidable in the axial direction of the valve stem 3 and not relatively rotatable. The peripheral surface of this support body 7 is as shown in FIG.
It is formed into a cylindrical shape that is eccentric by a predetermined amount e with respect to the valve stem 3.

As shown in FIGS. 1 and 3, the rotational force transmission mechanism 4 includes an operating gear 8 fitted onto the valve stem 3 and an operating gear 9 which is an internal gear and internally meshes with the operating gear 8. A support body 7 is connected to the lower end of the operating gear 8 so as to be relatively rotatable and immovable in the axial direction.
As shown in FIGS. 1 and 4, the operating gear 9 has a sphere 10 (not shown in FIG. 4) in annular grooves 7a and 9a formed on the opposing peripheral surfaces of the support 7 and the operating gear 9. ), the support 7
It is externally fitted and supported so as to be relatively rotatable and immovable in the axial direction. A valve operating handle 2 is fixed to the operating gear 9. Therefore, the handle 2 is rotatably supported in a state eccentric by a predetermined amount e with respect to the valve stem 3, and by rotating the handle 2, the valve stem 3 can be rotated via the gears 8 and 9. It's becoming like that.

As shown in FIGS. 1 to 3, the counting mechanism 5 includes a frame 11 attached to the upper surface of the support 7.
, a two-stage gear 12 pivotally supported on the frame 11 and a first
- third display bodies 13-15. Frame body 11
The cross-sectional shape is approximately a crescent shape corresponding to the opposing gap between the gears 8 and 9, and the lower end portion that is likely to interfere with the gears 8 and 9 is located within the gap, and the upper end portion that is free from such risk. Support portions 11b, 11b are formed that extend in opposite directions. Therefore, the frame body 11 does not hinder the rotation of the handle 2 and the valve stem 3 in any way, and the handle 2 does not interfere with the vertical movement of the handle 2.
However, it is not rotated by the rotational movement, but is held at a fixed position. The two-stage gear 12 meshes with a gear portion 8b formed on the upper surface of the operating gear 8 and a gear portion 13b formed on the first display body 13, and is interlocked with a gear portion 13b formed on the first display body 13 in conjunction with the rotation of the valve stem 3. It is designed so that it can be rotated. The display bodies 13 to 15 each display numbers 1 to 10 at equal intervals on the display parts 13a to 15a, which are peripheral surfaces, and are circular displays with the display parts 13a to 15a opened on the top surface of the handle 2. It faces window 2a. Note that a transparent plate 16 such as a convex lens is attached to the display window 2a, and on the upper surface of the frame 11,
A display board 17 having a window hole for exposing only one character in each of the display sections 13a to 15a is fixed. Although not shown, an intermittent rotation mechanism similar to that in a clock mechanism is provided between the display bodies 13 to 15, and when the first display body 13 rotates once, the second display body 14 is rotated by 1/10, and when the second display body 14 is rotated by one rotation, the third display body 15 is rotated by 1/10.

Therefore, according to the counting mechanism 5, the amount of rotation of the valve stem 3 is displayed in each display section 13a to 1 in the display window 2a.
It is digitally displayed by the number 5a. By appropriately setting the number of teeth of the two-stage gear 12, etc., this display can of course be made to display a value that matches the amount of rotation of the valve stem 3. It is also possible to display a value having a proportional relationship, for example, a value corresponding to a valve opening degree or a controlled amount.

In the control valve configured as described above, when the handle 2 is rotated, the rotational force transmission mechanism 4
The valve stem 3 is rotated in the same direction, and as a result, the valve stem 3 is threaded upward or downward to perform the desired valve operation.

At this time, the amount of rotation of the valve stem 3 is determined by each display body 13 to
15, the information is digitally displayed on the display window 2a of the handle 2. Therefore, it is possible to accurately control the flow rate and the like by manipulating the valve opening and operating the handle while viewing this display. Furthermore, if the counting mechanism 5 is attached to the support 7 as in the above embodiment, the display will be held at a constant position regardless of the rotation of the handle 2, making it easy to confirm the display and reliably avoid erroneous operations. can.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the design of the rotational force transmission mechanism 4 and the counting mechanism 5 can be changed as appropriate, and the valve stem 3 can be freely slidable in the axial direction on the valve body 1. The support body is constructed by connecting a valve body side portion which is supported non-rotatably and a handle side portion which is rotatably supported by the valve body 1 but not movable in the axial direction so as to be relatively threadable in the axial direction. 7 may be fixed to the lid 6 or configured integrally therewith. Furthermore, it goes without saying that the control valve to which the present invention is applied is not limited to the needle type.

[Effect of idea]

Since the controller of the present invention displays the amount of rotation of the valve stem on the handle surface, even an unskilled person can control the valve opening and therefore the flow rate by operating the handle using a flowmeter, etc. This can be done easily and accurately without using a meter, and its practical value is extremely great.

In addition, in the present invention, the cylindrical valve operating handle is supported by using a cylindrical support fitted to the valve body in an eccentric state with respect to the valve stem and slidable in the axial direction of the valve stem. In addition, since the rotational force transmission mechanism and the counting mechanism are housed in the internal space, the valve opening degree display mechanism becomes small and compact, and the controller can be significantly downsized.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the controller according to the present invention, with Figure 1 being a longitudinal sectional front view (the cross section is taken along line I-I in Figure 3), and Figure 2 being A plan view of the valve operating handle, FIG. 3 is a cross-sectional bottom view taken along the - line in FIG. 1, and FIG. 4 is a cross-sectional plan view taken along the - line in FIG. 1. 1...Valve box, 2...Valve operation handle, 2a...
Display window, 3... Valve stem, 4... Rotational force transmission mechanism, 5
... Counting mechanism, 13, 14, 15 ... Display body, 1
3a, 14a, 15a...Display section.

Claims (1)

[Scope of utility model registration request] In a controller in which a valve stem 3 is screwed into a valve body 1 and the valve opening degree is adjusted by rotation of the valve stem 3, a valve operating handle 2 is rotatably arranged with respect to the valve stem 3. and the valve stem 3, a rotational force transmission mechanism 4 for transmitting the rotational operating force of the handle 2 to the valve stem 3 is interposed,
Furthermore, a counting mechanism 5 for counting the amount of rotation of the valve stem 3 is incorporated inside the handle 2, and the handle 2
is formed into a cylindrical shape with a display window 2a on the upper surface and an operating gear 9 on the inner circumferential surface of the lower part, and is fitted into the valve body 1 in an eccentric state with respect to the valve stem 3 and in a state in which it can freely slide in the direction of the valve stem axis. The handle 2 is rotatably fitted and supported on the outer peripheral surface of the cylindrical support body 7, and the rotational force transmission mechanism 4 is connected to an operating gear 9 formed on the inner peripheral surface of the lower part of the handle 2. an operating gear 8 meshing with the operating gear 9 and fitted onto the valve stem 3; furthermore, the counting mechanism 5 is inserted through a non-meshing portion between the operating gear 9 and the operating gear 8 and protrudes upward; A frame 11 whose lower end is fixed to the upper surface of the support 7
and a two-stage gear 1 which is pivotally supported by the frame 11 and is rotationally driven by meshing with the meshing portion 8b of the operating gear 8.
2 and a display body 13 that is pivotally supported by the frame body 11 and rotationally driven by the two-stage gear 12, and the rotation amount of the valve stem 3 can be determined by displaying the display body 13 from the handle display window 2a. A controller characterized in that it can be visually detected.