JPH09329260A - Cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the output of an electric motor to opening/closing of a flow passage opening/closing valve with a small loss without being not under the influence of stroke of the flow passage opening/closing valve, when rotary motion is converted into rectilinear motion, and miniaturize a device by transferring rotation of the electric motor to the flow passage opening/closing means without contact. SOLUTION: When a motor 20 is rotated by an outer signal, a permanent magnet 19 directly connected to the motor 20 is rotated, and also a permanent magnet 17 arranged opposing to the permanent magnet 19 is rotated. As a result, a valve shaft 11 is pushed by an eccentric cam 16, and thereby, a valve element 12 is in an opening condition by being superior to energizing of a spring 13. Since a flow passage opening/closing valve is opened/closed utilizing rotation of an electric motor, the output of the electric motor makes independent of stroke of the opening/closing valve, and the stroke is enlarged easily. It is thus possible to reduce the diameter of a main valve, and it is also possible to miniaturize the whole of a cutoff valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutoff valve built in a gas meter for controlling the opening and closing of the flow of gas fluid flowing in a flow path.

[0002]

2. Description of the Related Art A conventional shut-off valve of this type is disclosed in Japanese Unexamined Patent Publication No. 1-17.
There was one as shown in Japanese Patent No. 6876. The configuration will be described below with reference to FIGS. 7, 8 and 9. In the figure, a main valve 4 biased by a spring 3 against a main valve seat 2 is provided in a passage 1. A pilot valve 5 is provided at the center of the main valve 4. An inner plunger 7 operated by an electromagnetic force generated by a coil 6 is in contact with the pilot valve 5.
The outer plunger 8 is connected to the main valve 4. Figure 7
In order to open the main valve 4 in the closed state as described above, the coil 6 is energized to pull up the inner plunger 7 from the pilot valve 5 as shown in FIG. At this time, the pressure difference between the upstream side and the downstream side of the main valve 4 becomes small. In this state, the outer plunger 8 is pulled up and the main valve 4 is opened as shown in FIG.

[0003]

However, the conventional shutoff valve has a problem in that the size of the main valve becomes large, resulting in an increase in the size of the entire shutoff valve. That is, in the prior art, a dry battery is used to energize the coil to move the plunger in the same direction as the main valve by electromagnetic force to open and close the main valve, and in order to increase the suction force of the plunger, The stroke was shortened to obtain suction power. However, as a result, the pressure loss of the main valve was increased, and in order to solve it, the diameter of the main valve was increased.

As a method of reducing the diameter of the main valve in the conventional example, there is a method of increasing the stroke of the plunger and increasing the opening degree of the main valve. For this purpose, it is necessary to increase the suction force of the plunger. Therefore, the number of turns of the coil is increased. As a result, there is a problem in that the coil portion that is the drive source becomes large, and eventually the shutoff valve becomes large in size.

[0005]

In order to solve the above problems, the present invention is configured to transmit the rotation of an electric motor to the flow path opening / closing means in a non-contact manner. According to the above invention, when the rotary motion is converted into the linear motion, the output of the electric motor can be transmitted to the opening / closing of the flow passage opening / closing valve without being affected by the stroke of the flow passage opening / closing valve.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a gas flow path for flowing a gas fluid, a flow path opening / closing means for opening / closing the gas flow path, an electric motor provided outside the gas flow path, and an operation of the electric motor. Is transmitted in a non-contact manner as the opening / closing operation of the flow path opening / closing means. Since the rotation of the electric motor is used to open and close the flow path opening / closing valve, a constant electric motor output displacement can be obtained regardless of the stroke of the valve. Moreover, since the output of the electric motor is transmitted in a non-contact manner, the transmission loss can be reduced.

Further, the drive transmission means transmits the operation of the electric motor to the flow passage opening / closing means in a non-contact manner by the attraction force of the magnet provided on the electric motor side and the magnet provided on the flow passage opening / closing means side. It was done. Since the attraction force between the magnets is used, the rotation of the electric motor can be transmitted to the opening / closing of the flow path opening / closing valve with a low-cost means.

Further, a gas passage for flowing a gas fluid, passage opening / closing means for opening / closing the gas passage, an electric motor provided outside the gas passage, a magnet provided at an output end of the electric motor, and an electric motor. And a flow path opening / closing means for opening / closing the flow path opening / closing means, and a magnet provided at an input end of the speed reducing means and facing a magnet provided at an output end of the electric motor in a non-contact manner. It is composed. Further, by providing the speed reducing means, a large output can be obtained with the small electric motor. Further, the output end of the electric motor and the input end of the speed reduction means have a low transmission force, and the magnet can be miniaturized.

Further, the speed reducing means is provided in the gas passage. And, since the speed reducing means is in the gas flow path, only the motor part projects outside the housing,
It can be easily built into a gas meter.

Further, an opening / closing state detecting means for the flow path opening / closing means is provided. Further, by providing the opening / closing detection means, the opening / closing control of the flow path opening / closing means can be performed in an arbitrary state.

Further, the electric motor has a storm control structure. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a shutoff valve according to Embodiment 1 of the present invention when the valve is closed. FIG. 2 is a sectional view when the valve is open. In FIG. 1, 9 is a housing. Inside the housing 9, a gas flow path 10 through which a gas fluid flows is formed. In the gas flow passage 10, a valve body 12 which is a flow passage opening / closing means having a valve shaft 11 is biased by a spring 13 toward a valve seat 14. Reference numeral 15 is a bearing portion of the valve shaft 11. The eccentric cam 1 is installed in the gas passage 10 from which the valve shaft 11 is projected.
6. The rotating shaft 18 to which the permanent magnet 17 is fixed is configured. Further, a motor 20 having a permanent magnet 19 facing the permanent magnet 17 is attached to the housing 9 by a fixture 21 outside the housing 9. Eccentric cam 1
6, the permanent magnets 17 and 19 constitute drive transmission means.

Next, the operation will be described. In the state of FIG. 1, when the motor 20 rotates by an external signal (not shown), the permanent magnet 19 directly connected to the motor 20 rotates. At the same time, the permanent magnet 17 provided so as to face the permanent magnet 19 also rotates. As a result, the eccentric cam 16 pushes the valve shaft 11, and the valve body 12 overcomes the urging force of the spring 13 to be in the open state as shown in FIG. When the present invention is incorporated in a gas meter (not shown), the housing 9 is
It constitutes a part of the gas meter body. And
The motor 20 is provided at a position other than the gas flow path of the gas meter, but is housed inside the gas meter main body and does not project to the outside thereof. 22 and 23 show an inlet and an outlet.

(Embodiment 2) FIG. 3 is a sectional view of a shutoff valve according to Embodiment 2 of the present invention when the valve is closed. FIG. 4 is a sectional view when the valve is open. The difference from the first embodiment is that a deceleration means 24 having a gear (not shown) built therein is provided in the gas flow passage 10 in the housing 9. In the figure, 25 is a permanent magnet provided so as to face the permanent magnet 19. Two
Reference numeral 6 denotes an eccentric cam provided on the output side of the speed reducer 23. The components having the same reference numerals as those in the first embodiment have the same structure, and description thereof will be omitted.

Next, the operation and action will be described with reference to FIG.
In this state, the motor 2 is driven by an external signal (not shown).
When 0 rotates, the permanent magnet 19 directly connected to the motor 20 rotates. At the same time, the permanent magnet 25 provided so as to face the permanent magnet 19 also rotates. The rotation of the permanent magnet 25 is decelerated by a gear (not shown) of the speed reduction means 24, and the output torque is expanded, so that the eccentric cam 26 rotates with a large torque. Then, when the eccentric cam 26 pushes the valve shaft 11, the valve body 11 overcomes the biasing force of the spring 13 to be in the open state as shown in FIG.

(Third Embodiment) FIG. 5 is a sectional view of a shutoff valve according to a third embodiment of the present invention when the valve is open. The difference from Example 2 is that
The permanent magnet 28 is fixed to the end of the motor 20, and a magnetic detection switch that is opened and closed by the permanent magnet 28 is provided outside the housing 9. The same reference numerals as those in the second embodiment have the same structure, and the description thereof will be omitted.

Next, the operation and action will be described with reference to FIG.
In this state, the motor 2 is driven by an external signal (not shown).
0 means that the motor 20 is provided at a position other than the gas flow path of the gas meter, but when the gas rotates, the rotation of the motor 20 is transmitted from the permanent magnets 19 and 25 to the speed reducer 24.
The eccentric cam 26 is rotated to move the valve body 12 in the valve closing direction. When the valve body 12 moves upward in the drawing and comes into contact with the valve seat 14, the magnetic detection switch 26 is activated and the motor 20 is stopped.

(Embodiment 4) FIG. 6 is a sectional view of a shutoff valve of Embodiment 4 of the present invention when the valve is open. The difference from Example 2 is that
That is, the motor 20 is molded with the fixture 21. The same reference numerals as those in the second embodiment have the same structure, and the operation is also the same, and the description thereof will be omitted.

[0019]

As is apparent from the above description, according to the shutoff valve of the present invention, the following effects can be obtained.

Since the passage opening / closing valve is opened / closed by utilizing the rotation of the electric motor, the output of the electric motor has no relation to the stroke of the opening / closing valve, and the stroke can be easily increased.
As a result, the diameter of the main valve can be reduced, and the size of the shutoff valve as a whole can be reduced.

Also, by transmitting the output of the electric motor in a non-contact manner, the transmission loss of the output of the electric motor can be reduced.

Further, the main valve can be opened and closed with a large output by opening and closing the main valve of the output of the electric motor through the speed reducing means, and the shut-off valve of the present invention can be applied to gas meters of various sizes. . By constructing magnets at the output end of the electric motor and the input side of the speed reducing means, the force is transmitted at the place where the rotational torque is the smallest in the speed reducing means, and it is possible to realize with a compact and low-cost magnet. it can.

Further, by providing the speed reducing means in the gas flow path, only the motor portion projects to the outside of the housing, so that dust can be prevented from entering the speed reducing means and the reliability is improved. At the same time, only the motor goes out of the gas flow path, and this motor can be easily incorporated in the casing of the gas meter.

Further, by providing the function of detecting the position of the main valve, it is possible to secure a constant opening and closing performance.

[Brief description of drawings]

FIG. 1 is a sectional view of a shutoff valve according to a first embodiment of the present invention when the valve is closed.

FIG. 2 is a sectional view of the shutoff valve when the valve is open.

FIG. 3 is a sectional view of a shutoff valve according to a second embodiment of the present invention when the valve is closed.

FIG. 4 is a sectional view of the shutoff valve when the valve is open.

FIG. 5 is a sectional view of the shutoff valve according to the third embodiment of the present invention when the valve is open.

FIG. 6 is a sectional view of a shutoff valve according to a fourth embodiment of the present invention when the valve is open.

FIG. 7 is a sectional view of a conventional shutoff valve when the valve is closed.

FIG. 8 is a sectional view of the shutoff valve in operation.

FIG. 9 is a sectional view of the shutoff valve when the valve is open.

[Explanation of symbols]

 10 Gas Flow Path 12 Flow Opening / Closing Means 16 Drive Transmission Means (Eccentric Cam) 17, 19 Drive Transmission Means (Permanent Magnet) 20 Electric Motor (Motor)

Claims (6)

[Claims] 1. A gas flow path for flowing a gas fluid, a flow path opening / closing means for opening / closing the gas flow path, an electric motor provided outside the gas flow path, and an operation of the electric motor in a non-contact manner. A shutoff valve comprising a drive transmission means for transmitting the opening / closing operation of the road opening / closing means. 2. The drive transmission means transmits the operation of the electric motor to the flow passage opening / closing means in a non-contact manner by the attraction force of a magnet provided on the electric motor side and a magnet provided on the flow passage opening / closing means side. The shutoff valve according to claim 1. 3. A gas passage for flowing a gas fluid, passage opening / closing means for opening / closing the gas passage, an electric motor provided outside the gas passage, and a magnet provided at an output end of the electric motor. And a deceleration means of the electric motor provided between the electric motor and the flow passage opening / closing means for opening / closing the flow passage opening / closing means, and a magnet provided at an input end of the deceleration means and provided at an output end of the electric motor. A shut-off valve consisting of a magnet that is in non-contact with the magnet. 4. A shutoff valve according to claim 3, wherein the speed reducing means is provided in the gas flow path. 5. The shutoff valve according to claim 1, further comprising opening / closing state detecting means for the flow path opening / closing means. 6. The shutoff valve according to claim 1, wherein the motor has a storm control structure.