JPH0537111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a worm gear type actuator that drives a rotary valve such as a butterfly valve or a ball valve. Concerning indicators.

[Conventional technology]

The conventional butterfly valve, as shown in Figure 4,
By rotating the valve stem, a valve body 2 attached to the valve stem is rotated within the main body (valve body) 1 to open and close the valve, and FIG. 4 shows the fully closed state. The valve stem is inserted into the boss portion of the valve body 2 and the screw 2
It is fixed at a.

The valve stem extends through the upper part of the valve body 1, and as shown in FIG. 6, is configured to engage a worm 3a rotated by the handle 3 with a worm wheel 3b coupled to the upper part of the valve stem. The worm gear type actuator 4 is connected to the worm gear type actuator 4.

As shown in FIG. 3, an indicator (pointer) 5 is attached to the top surface of the actuator 4 to indicate the rotation angle of the valve stem.The indicator 5 is located at the SHUT (closed) position on the display panel 6. It shows.

[The problem that the idea attempts to solve]

In the conventional butterfly valve worm gear type actuator 4 described above, the opening degree of the valve body can be determined only when viewed from the direction A (upward direction) shown in FIG. However, in actual piping, depending on the state of the piping, the state of the scaffolding at the installation location, etc., the operator may have to read the indicator 5 from the B direction (lateral direction).

In this case, it is impossible for the operator to accurately read the opening degree, and in particular, the operator must rely only on the operating force of the handle 3 to confirm the fully closed position.

On the other hand, when the torque characteristic of the butterfly valve is close to fully closed, the operating force of the handle 3 becomes heavy due to the repulsive force of the seat ring 7, but as shown in FIG. Since the seat ring 7 begins to sink in from the front side 2a, the steering force becomes heavy even if the valve body 2 is not in the fully closed position 2b.

Further, when the valve body is closed to the fully closed position, as shown in FIG. 6, the worm wheel 3b comes into contact with the stopper bolt 8, so that the handle operation force becomes heavy and the handle becomes difficult to turn.

Therefore, an operator who relies only on the handle operating force as a criterion for determining the valve opening degree cannot accurately determine the opening degree. Therefore, there were problems in that leakage occurred because the valve was not closed, and that even though the worm gear 3b was in contact with the stopper bolt 8, an excessive operating force was applied and the actuator was destroyed.

The present invention solves the problems of the prior art described above, and makes it possible to check the valve opening, especially the fully closed position, not only from above the indicator that indicates the valve opening, but also from the side. The purpose is to provide a worm gear type actuator.

[Means to solve the problem]

In order to achieve the above object, the present invention attaches a bendable plate-shaped actuating piece made of an elastic body with one free end to the indicator that displays the opening degree of the valve body. A chevron-shaped latch is provided in front of the closed position to abut the free end of the actuating piece, and a sounding piece is provided behind the fully closed position to be struck by the actuating piece. Thus, the sounding piece is struck by the accumulated energy of the actuating piece which has been bent and deformed.

The shape and location of the latch are such that when the indicator reaches the fully closed position, the free end of the operating piece passes over the latch and strikes the sounding piece.

[Effect]

Since the present invention is constructed as described above, when the valve is closed, the worm of the actuator is rotated from the outside by a handle, etc., and the worm gear meshing with the worm is rotated, thereby rotating the valve stem connected to the worm gear. As the valve body is rotated in the closing direction,
An indicator provided on the top surface of the actuator rotates from a fully open position to a fully closed position. Accordingly, the elastic actuation piece also moves together with the indicator.

After the free end of the actuating piece comes into contact with a protruding object such as a latch provided in front of the fully closed position, the actuating piece further rotates in the fully closed direction while elastically deforming (curving). When the valve body and therefore the indicator reach the fully closed position, the free end of the actuating piece climbs over a protruding object such as a latch, the elastic force of the deformed actuating piece is released, and the reaction force causes the sounding piece to move. The valve body makes a sound when struck to notify the outside that the valve body is fully closed.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a top plan view of an actuator showing an embodiment of the present invention, and FIG. 2 is a top view of the actuator shown in FIG.
It is a side view seen from the direction, and FIGS. 3 and 6 in the figure
The same reference numerals as those shown in the figures indicate the same or similar parts.

In the figure, an indicator 5 is rotatably attached to a display panel 6 attached to the top surface of an actuator 4 that has a built-in worm wheel. A plate-shaped actuating piece 10 having a length of 10 is attached with only its base fixed and its tip left as a free end.

On the other hand, there is a point 6 on the display panel 6 indicating the fully closed position.
As shown in FIG. 2, a chevron-shaped latch 11 is provided at the front in the rotational direction of a, so that the free end of the operating piece 10 comes into contact with the latch 11, and further behind the fully closed position, A sounding piece 12 that emits a sound when struck by the actuating piece 10 is attached. The shape and location of the latch 11 are such that when the valve body is fully closed and the indicator reaches the fully closed position 6a, the free end of the actuating piece 10 climbs over the latch 11 and strikes the sounding piece 12. is set to .

Next, the effect will be explained.

When the valve is closed, the worm 3a (FIG. 6) of the actuator 4 is rotated from the outside by the handle 3 (FIG. 3) to drive the worm wheel 3b that meshes with the worm wheel 3b, and the valve (not shown) attached to the worm wheel is rotated. As the rod is rotated and the valve body 2 (FIG. 4) is rotated in the closing direction, the indicator 5 provided on the top surface of the actuator 4 is rotated from the fully open position 6b toward the fully closed position 6a. ,
The elastic actuation piece 10 also rotates together with the indicator 5.

After the free end of the actuating piece 10 comes into contact with the latch 11 provided in front of the fully closed position, it further rotates in the fully closed direction while resisting elasticity and curving as shown by the dotted line in FIG. When the indicator 5 reaches the fully closed position 6a, the free end of the actuating piece 10 passes over the top of the chevron-shaped latch 10. At this time,
The elastic force of the actuating piece 10 is released, and the accumulated elastic energy becomes a reaction force and hits the sounding piece 12 to emit a sound, thereby informing the outside that the valve body is fully closed.

Furthermore, when the valve is opened, the indicator 5 is rotated counterclockwise from the fully closed position 6a to the fully open position 6b by operating the actuator 4 in the opposite direction to that described above. 10 curves over the latch 11 from the opposite side and eventually reaches the fully open position 6b.

According to this embodiment, the elastic actuating piece 10 is bent by the latch 11 provided before the fully closed position, and the stored energy due to the bending is utilized, so that the structure is simple, and Smooth operation can be achieved without requiring special operations not only when the valve is closed but also when the valve is opened.

Furthermore, the actuator of the present invention can of course be applied to rotary valves other than butterfly valves.

[Effect of idea]

As explained above, according to the present invention, a plate-shaped actuating piece made of an elastic body with one free end is attached to the indicator that displays the opening degree of the valve body in a bendable manner, and the indicator is placed in the fully closed position on the display panel. The elastic actuating piece is bent by a latch provided in front of the valve, and the accumulated energy from the bending is used to hit the sounding piece.The structure is simple, and the operator can use the indicator when operating the valve. Even if the display panel is located in the horizontal direction, it is possible to know the exact fully closed position, and therefore it is possible to prevent valve leakage due to insufficient shutoff and damage to the actuator due to overtorque. .

Furthermore, since the latch is formed into a chevron shape, it can be smoothly engaged with and disengaged from the free end of the actuating piece.

[Brief explanation of drawings]

FIG. 1 is a plan view of an actuator showing an embodiment of the present invention, FIG. 2 is a side view seen from direction C in FIG. 1, FIGS. 3 to 6 show conventional examples, and FIG.
The figure is a plan view of a butterfly valve equipped with an actuator, Figure 4 is a front view, Figure 5 is an explanatory diagram of the main parts, and Figure 6 is a front view.
The figure is an explanatory diagram showing the inside of the actuator. DESCRIPTION OF SYMBOLS 1... Main body, 2... Valve body, 4... Actuator, 5... Indicator, 6... Display panel, 10...
...Actuation piece, 11...Latch, 12...Sounding piece.

Claims (1)

[Scope of utility model registration request] In a rotary valve in which the valve body is opened and closed by a worm gear type actuator, a plate-shaped actuating piece made of an elastic body with one free end is attached in a bendable manner to the indicator that displays the degree of opening of the valve body. In front of the fully closed position on the panel, a chevron-shaped latch is provided which abuts the free end of the actuating piece, and at the rear of the fully closed position, a sounding piece is provided which is struck by the actuating piece. A worm gear type actuator having a sounding piece, characterized in that the sounding piece is struck by the accumulated energy of the actuating piece that is curved and deformed by the latch.