JPH0636378Y2 - Valve opening / closing mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention operates a toggle operating plate to move the valve body by using the magnetic force of a magnet that is brought into contact with and separated from the valve to open and close the valve. It is related to the mechanism.

[Conventional technology]

Conventionally, as a valve opening / closing mechanism of this type, there is a heat responsive type shown in FIG.

In the same figure, the temperature rise in the heat-sensitive section 10 increases the internal gas pressure, and the bellows 12 expands. In response to this, the first operating plate 13 is pushed by the bellows 12 and rotates counterclockwise. When the first actuating plate 13 is rotated beyond a predetermined position, the force acting from the toggle leaf spring 24 to the second actuating plate 22 in the counterclockwise direction is reversed, and the second actuating plate 22 is rotated. It rotates in the direction and moves from the two-dot broken line to the solid line. As a result, the magnet 23 fixed to the tip of the second operating plate 22 is separated from the cap 34. By separating the magnets 23, the ball valve body 32 opens the valve seat 33a inside the cap 34.

Then, when the temperature in the heat-sensitive section 10 decreases, the internal gas pressure is felt and the bellows 12 contracts, and the first operating plate 13 rotates clockwise by the tensile force of the tension spring 17. As a result, the direction of the force acting on the second operating plate 22 from the toggle leaf spring 24 is reversed, and the second operating plate 22 is rotated from the solid line state to the two-dot broken line state. This second operating plate
The rotation of 22 causes the magnet 23 to contact the cap 34,
The magnetic force attracts the piston 30 inside the cap 34 against the spring 35, raises the ball valve element 32 connected to the piston 30 and closes the valve seat 33a.

The cam plate 20 can adjust the relationship between the rotating operation of the second operating plate 22 and the expanding and contracting operation of the bellows 12. That is, when the cam plate 20 is rotated, the tension of the tension spring 17 changes. For example, if the tension is increased, the bellows
When the gas pressure inside 12 is higher than before, that is, when the temperature in the heat-sensitive part 10 is high, the toggle operation is performed and the valve is opened and closed.

Contrary to the above, if the tension of the tension spring 17 is weakened,
The opening and closing can be performed at a low temperature. That is, the external pressure applied to the bellows 12 by the tension spring 17 changes, and the relationship between the gas pressure in the bellows 12 and expansion and contraction is adjusted.

In addition, 36 and 37 are the inflow port and outflow port of the fluid with respect to the valve.

[Problems to be solved by the invention]

In the above-mentioned conventional valve opening / closing mechanism, the moving direction X of the magnet 23 fixed to the operating plate 22 coincides with the moving direction of the piston 30 by the action of the magnetic force F of the magnet 23 as shown in FIG. . Therefore, when the magnet 23 is moved in the direction away from the piston 30, it must be moved against 100% magnetic force, and a large force is required to move the magnet 23.

The force to move the operating plate 22 by the toggle operation is the leaf spring for toggle.
As described above, in order to move the operating plate 22 against the magnetic force of the magnet 23, the leaf spring 24
It is necessary to use one with a large reaction force.

By the way, when the leaf spring 24 having a large reaction force is used, a large force is required to deform and invert the leaf spring 24, and the differential becomes large, and the leaf spring 24 is inverted and the magnet 23 descends. At this time, the magnet 23 collides with a large force and bounces, causing chattering in the valve element 32, which causes a problem that the valve cannot be reliably opened and closed.

Therefore, if a magnet having a weak magnetic force is used, another problem arises in that the valve cannot be opened and closed under a large pressure difference.

Therefore, the present invention solves the above-mentioned problems of the related art, and when the toggle leaf spring moves beyond the dead point, the operating plate having the magnet attached thereto is rotated reversely, and the magnet is rotated by the reverse rotation of the operating plate. In the case of opening and closing the valve by moving it close to and away from the valve body, it is possible to use a magnet with a strong magnetic force without using a large leaf spring for toggle, so that the valve can be opened and closed surely and large. It is an object of the present invention to provide a valve opening / closing mechanism that can be operated even under a differential pressure.

[Means for solving problems]

In order to achieve the above object, the valve opening / closing mechanism according to the present invention reverses and rotates the actuating plate having the magnet attached when the toggle leaf spring moves beyond the dead point.
The magnet is brought into contact with and separated from the valve body by reversal rotation of the operating plate, a magnetic force is applied to the valve body by the approach of the magnet to the valve body, and the magnet is separated from the valve body by the separation of the magnet. In a valve opening / closing mechanism that eliminates the magnetic force of the magnet to the valve body and opens and closes the valve by moving the valve body depending on the presence or absence of the magnetic force of the magnet that acts on the valve body, the contact of the magnet to the valve body It is characterized in that the direction of separation and the direction in which the valve body moves due to the action of the magnetic force of the magnet are orthogonal to each other.

[Action]

With the above configuration, since the direction of contact and separation of the magnet with respect to the valve body and the direction of movement of the valve body due to the action of the magnetic force of the magnet are orthogonal to each other, the magnet is separated from the valve body even if the magnetic force of the magnet is large. The force to move in the direction may be small but good.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a heat-actuated valve opening / closing mechanism according to an embodiment of the present invention. In the drawings, 40 is a heat-sensing portion, and 41 is a member that expands and contracts according to increase / decrease in internal gas pressure. The bellows 41 is connected to the heat sensitive portion 40 via a pipe 42. Reference numeral 43 denotes an L-shaped first actuating plate, which is rotatably supported by a side plate 44 at a portion 43a near the bent portion. A clockwise rotation force is applied to the first operating plate 43 by a tension spring 47 suspended between the first operating plate 43 and an adjusting plate 45 via a screw 46, and an upper protrusion 43b thereof elastically contacts the lower end surface of the bellows 41. Has been held. Therefore, by the expansion and contraction operation of the bellows 41, the first operation plate 43 is rotated according to or against the biasing force of the spring 47.

Reference numeral 48 denotes a cam plate which is rotated by a rotating shaft 49, and an adjusting plate 45 is pressed against the cam plate. The rotating operation of the rotating shaft 49 causes the cam plate 48 to rotate and the adjusting plate 45 to swing. By doing so, the tension of the tension spring 47 is adjusted.

Reference numeral 50 denotes a second actuating plate, one end side portion of which is rotatably supported by the side plate 44, and a toggle leaf spring 51 is contracted between the first actuating plate 43 and the side plate 44. The other end of the second operating plate 50 is engaged with a holder portion 52a holding a magnet 52.

As described above, the first and second actuating plates 43, 50 are separately rotatable. For example, when the first actuating plate 43 is rotated clockwise in FIG. 1, the leaf spring 51 has one end 51a. The other end 51b moves counterclockwise with the fulcrum as a fulcrum, and accordingly, it is further bent. And the other end 51b of the leaf spring 51
When moves beyond the dead point, the force that had been working to rotate the second actuating plate 50 in the clockwise direction until then becomes to act in the opposite direction, and the second actuating plate 50 causes the leaf spring 51 to repel. A toggle operation of receiving a force and rotating counterclockwise is performed.

In this state, when the first actuating plate 43 is then rotated clockwise, the same action as the leaf spring 51 causes the second actuating plate 43 to rotate.
50 Turn clockwise to return to the state shown.

As described above, the first operating plate 43, the second operating plate 50, and the leaf spring
Reference numeral 51 constitutes a toggle mechanism having the first operating plate 43 as an input portion and the second operating plate 50 as an output portion.

Reference numeral 53 is an auxiliary spring that applies a counterclockwise biasing force to the second operating plate 50, and the auxiliary spring is mounted in a compressed state on a projection 54a formed integrally with the frame 54. 55 is the second operating plate 50
With the contact actuating shaft fixed to one end of the contact, the toggle spring 56 is reversed by the displacement of the actuating shaft 55 to open and close the contacts 57a, 57b.

The holder 52a holding the magnet 52 is a frame 54
It is housed in a channel 54b formed in and is guided so as to move linearly. Therefore, the holder 52a and the second operating plate 5 are guided.
The engagement with 0 is performed so that the holder 52a can be moved along the channel 54b by the rotation of the second operating plate 50.

As shown in FIG. 2, a valve body 60 is attached to the frame body 54, and the valve body 60 is made of a magnetic material such as a piston 60a.
The valve ball 60b is fixedly attached to the valve seat 60c, and the piston 60a is moved downward or upward to bring the valve ball 60b into and out of contact with the valve seat 60c. Piston 60a is the valve body 60
If a non-magnetic material is placed on the upper part of the cap 60d, a compression spring 60e inscribed in the cap 60d constantly urges the valve ball 60b in the direction of contacting the valve seat 60c, but the magnet 52 faces the cap 60d. Then, the magnet 52 is attracted and moved against the compression spring 60e, the valve ball 60b is separated from the valve seat 60c, and the valve is opened.
That is, the magnet 52, the piston 60a, the compression spring 6
The valve mechanism includes 0d, the valve ball 60b, and the like. 6
1,62 are an inlet and an outlet.

With the above configuration, when the internal gas pressure increases due to the temperature rise in the heat sensitive section 40, the bellows 41 expands, and the first operating plate 43 is pushed by this bellows 41 and rotates counterclockwise in FIG. When the first operating plate 43 is rotated beyond a predetermined position, the direction of the reaction force acting on the second operating plate 50 from the leaf spring 51 is reversed and the second operating plate 50 is moved clockwise. The magnet 52 is rotated, whereby the magnet 52 is moved to face the cap 60d as illustrated.

In this state, the magnetic force of the magnet 52 acts on the piston 60a via the cap 60d, causing the piston 60a to move to the spring 60.
Move against e. This movement of the piston 60a separates the valve ball 60b from the valve seat 60c and opens the valve.

In the illustrated state, the leaf spring 51 urges the second operating plate 50 counterclockwise, but when the temperature of the heat-sensitive portion 40 drops,
The gas pressure in the interior decreases and the bellows 41 contracts, and the projection 43b is elastically contacted with the lower end surface of the bellows 41.
Is rotated clockwise in FIG. 1 by the tensile force of the tension spring 47, and the leaf spring 51 is compressed. And the first
When the rotation of the operating plate 43 progresses, the tip of the first operating plate 43 and the second operating plate 50 come to the same position, and when the rotation further proceeds, the leaf spring 51.
The direction of the reaction force due to is reversed, and the second operating plate 50 is biased in the counterclockwise direction.

The reaction force of the leaf spring 51 is combined with the force of the auxiliary spring 53 acting on the second actuation plate 50 to rotate the second actuation plate 50 counterclockwise so that the second actuation plate 50 moves. Holder that is engaged at the tip
The magnet 52 is moved in the direction of the arrow along the channel 54b via the channel 52a. This movement of the magnet 52 causes the magnetic force to act on the piston 60a as shown in FIG.
The force is required to move the magnet 52 in the direction X'that is orthogonal to the moving direction F'of 0a, and the force required to move the magnet 52 may be smaller than that in the case where the direction of movement of the piston due to the magnetic force coincides.

In addition, when there is no force applied to the second actuation plate 50 by the auxiliary spring 53, the force for moving the magnet 52 is set to the leaf spring.
Since only 51 must bear, a large reaction force must be used for leaf spring 51.
By providing 53, it is possible to use a leaf spring with a small reaction force. In addition, the auxiliary spring 53 consisting of a coil spring
Alternatively, a similar effect can be obtained by using a plate-shaped spring having one end fixed to the second actuation plate 50.

When the magnet 52 moves away from the cap 60d, the piston 60a
Is returned by the spring 60e and the valve ball 60b
It is pressed against c and the valve is closed.

In the above-described embodiment, the valve is opened with the magnet 52 facing the cap 60d, but the valve can be closed by changing the position of the valve ball 60b.

Further, in the example of the drawing, the magnet 52 is linearly moved along the channel 54b, but the same effect can be obtained by directly fixing the magnet 52 to the tip of the second operating plate 50 and moving it in an arc. .

[Effect of device]

As described above, according to the present invention, even if the magnetic force of the magnet is large, the force for moving the magnet in the direction of separating from the valve body may be smaller than that of the conventional one. Since a magnet having a strong magnetic force can be used without using a leaf spring for a toggle having a large force, the valve can be opened and closed reliably and under a large differential pressure.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a side sectional view, FIG. 2 is a partially cutaway view taken along line II-II in FIG. 1, and FIG. 3 is a bottom view. 4, FIG. 4 is a side sectional view of a conventional example, and FIG. 6 is a main portion explanatory view of the example of FIG. 50: first actuating plate, 51: toggle leaf spring, 52: magnet, 60: valve body, 60a: piston, 60b: valve ball.

Claims (1)

[Scope of utility model registration request] 1. When a toggle leaf spring moves beyond a dead point, an operating plate having a magnet attached thereto is rotated reversely, and the magnet is brought into contact with and separated from a valve body by the reverse rotation of the operating plate. The magnet acting on the valve body by causing the magnet to approach the valve body to exert a magnetic force on the valve body, and by separating the magnet from the valve body to eliminate the action of the magnetic force of the magnet on the valve body. In the valve opening / closing mechanism that opens and closes the valve by moving the valve body depending on the presence or absence of the magnetic force of the magnet, A valve opening / closing mechanism characterized by being orthogonal.