JPH031670Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a discontinuously operated pilot relay that provides discontinuous output necessary for discontinuous shutoff valves and the like.

(Prior Art) As a conventional discontinuous pilot relay, there is one described, for example, in Japanese Patent Publication No. 49-5140. FIG. 4 is a sectional view of the structure of the above-mentioned conventional example. The diaphragm 1 partitions an input pressure chamber 2 and an output pressure chamber 3, and a rod 4 is fixed to the center thereof and contacts a valve 5. Further, an exhaust seat 6 is raised in the center of the output pressure chamber 3 and is opposed to the diaphragm 1 as shown. The valve 5 is pushed up by a spring 7 and is pressed against the air supply seat 8. A valve passage 28 is provided at an intermediate portion between the exhaust seat 6 and the air supply seat 8, and an output extraction passage 9 is installed in the middle of the valve passage 28. Further, one end of the output pressure chamber 3 communicates with the atmosphere through a vent 10.
Furthermore, a spring 11 is fitted around the exhaust seat 6 to push up the diaphragm 1. The input pressure chamber 2 also has an input intake passage 12 and a discontinuous actuation plate 13. FIG. 5 shows details of the discontinuous operation plate 13.a
is a front view, and b is a plan view. The central part 14 of the discontinuous actuating plate is fixed to the extension of the rod 4, and both ends are fixed to the body 15. The discontinuous actuation plate has a tanzag-shaped slit 17 in the center of the base plate 16, and a leaf spring 18 is fixed at both ends with a certain gap d between the slits 17, but there is no straight line between the fixed parts. The distance is configured to be shorter than the length of the actual bending portion of the leaf spring 18.

(Problem to be solved by the invention) However, this discontinuously actuated pilot relay requires a discontinuously actuated plate, and it is required to accurately fix the board and leaf spring to keep the gap d constant. The drawbacks were that it took time to assemble and the mechanism was complicated.

The present invention solves the above-mentioned drawbacks and aims to provide a discontinuously operated pilot relay that has a simple structure and is easy to assemble.

(Means for solving the problem) The present invention that achieves this purpose is based on input pressure Pi.
An input pressure chamber 2 to which Po is applied, an output pressure chamber 3 to which output pressure Po is applied, and a diaphragm 1 that partitions the input pressure chamber and the output pressure chamber and has buckling characteristics.
and an air supply chamber 21 to which the supply pressure Ps is supplied, and a spherical valve 5 connected to the diaphragm through the rod 4 and located at the boundary between the output pressure chamber and the air supply chamber.
A plate spring 7 is provided on the air supply chamber side in pressure contact with the valve via an adjustment screw 20 to determine the pressure difference between the input pressure and the output pressure at which the diaphragm buckles.

The valve is characterized in that the distance between the leaf spring and the valve is adjusted by the adjustment screw to adjust the pressure difference that causes the diaphragm to turn on and off.

<Function> Each component of the present invention has the following functions. The diaphragm opens and closes the valve depending on the input pressure, making the output pressure either atmospheric pressure or supply pressure. The leaf spring provides a restoring force to the valve, providing a closing force to the valve so that the output pressure is atmospheric pressure. The adjustment screw adjusts the magnitude of the restoring force of the leaf spring, thus facilitating adjustment of the buckling pressure of the diaphragm.

(Example) The present invention will be explained below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention. The spring 7 is a leaf spring and is fixed to the body 15 using screws 19. The force with which the spring 7 pushes up the valve 5 is adjusted using an adjusting screw 20.
The air supply chamber 21 is provided on the spring 7 side of the valve 5, and is provided with air supply pressure.
Ps is acting. The diaphragm 1 has an edge 2
2, and a protrusion 24 provided around the part for fixing the rod 24.
An inner circular portion 25 is provided inside the ridge 24 , and an outer circular portion 26 is provided between the convex portion 24 and the rising portion 23 . Since the rising portion 23 applies a compressive force to the outer circular portion 26, the outer circular portion 26 is initially curved in a convex shape. The convex portion 24 is provided to enable the inner circular portion 25 to deform independently of the outer circular portion 26 when a predetermined pressure is applied to the diaphragm 1. The inner circular part 25 is the spring 1
It collides with 1. Edge portion 22 of diaphragm 1
is held between the body 15 which is divided into two parts with an annular gasket 27 interposed therebetween.

The operation of the device configured in this manner will be described next. When the input pressure Pi applied from the input intake passage 12 to the input pressure chamber 2 is low, the diaphragm 1 is curved in a convex shape, so the force of the spring 7 causes the valve 5 to move toward the air supply seat 8.
is in contact with Therefore, the supply pressure Ps is the output pressure chamber 3
The output pressure Po is atmospheric pressure.

Next, when the input pressure Pi increases slightly, the force acting on diaphragm 1 increases;
Due to its own stiffness and the stiffness of the spring 11, the rod 4
hardly moves. Therefore, there is almost no gap created in the air supply seat 8, and the output pressure Po is approximately equal to atmospheric pressure.

Next, the input pressure Pi becomes higher and the predetermined pressure Pis
, the diaphragm 1 buckles due to the compressive force exerted on the outer circular portion 26 by the rising edge 23 and the pressure exerted by the input pressure Pi, and the outer circular portion 26 rapidly curves into a concave shape at the rising edge 23. . Here, due to the action of the convex portion 24 provided on the diaphragm 1, the force of the spring 11 and the force of the outer circular portion 26 are balanced via the inner circular portion 25, so that no unreasonable stress concentration occurs on the diaphragm 1. When the diaphragm 1 curves into a concave shape, the rod 4 moves downward and opens the valve 5.
The inner circular portion 25 closely contacts the exhaust seat 6 and blocks communication between the output outlet path 9 and the vent 10. Therefore, the output pressure Po
becomes equal to the supply pressure Ps. FIG. 2 shows this state.

If the input pressure decreases from this state, the state shown in FIG. 1 is returned to by performing the operation opposite to that described above.

FIG. 3 shows the relationship between the input pressure Pi and the output pressure Po of the discontinuously operated pilot relay according to this embodiment. At a predetermined pressure Pis at which the diaphragm 1 transitions from convex to concave, so-called ON-OFF
It is understood that it is working. This ON-
The value of the predetermined pressure Pis for OFF operation is determined by adjusting screw 2.
Adjusted by 0.

In the above embodiment, the outer circular portion 26 of the diaphragm 1 is deformed into a concave shape, and a convex portion is provided in order to prevent excessive stress from being generated on the diaphragm 1 when the inner circular portion 25 contacts the exhaust seat 6. Although 24 is provided, the present invention is not limited to this, and 24 may be formed with a recessed portion, a waveform, or the like, or may be omitted. Further, in the case of a flat plate diaphragm having no upright portion 23, a convex portion, a concave portion, a corrugated portion, etc. may be provided on the circumferential portion of the exhaust seat 6, and the inner portion of the diaphragm may have buckling characteristics.

Alternatively, if the exhaust seat 6 is omitted and a high pressure is applied to the diaphragm 1, the spring contracts and the wires forming the spring come into contact with each other, cutting off communication between the outlet passage 9 and the vent 10. good.

(Effects of the Invention) As explained above, according to the present invention, the buckling function of the diaphragm is used to realize the on/off operation of the relay, resulting in a simple configuration.
In addition, since the pressure difference at which the diaphragm buckles can be adjusted using the adjustment screw, the operating pressure can be continuously adjusted and set to a pressure difference suitable for various devices, and each relay can absorb variations in the diaphragm and leaf spring. Can be adjusted to operate with uniform pressure difference.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention;
Fig. 2 is a cross-sectional view of the configuration for explaining an example of operation, Fig. 3 is a curve diagram showing the relationship between input pressure and output pressure of the discontinuously operated pilot relay according to the present invention, and Fig. 4 is a diagram of the conventional example. FIG. 5 is a configuration diagram of a conventional discontinuous actuating plate, in which a is a front view and b is a plan view. 1...Diaphragm, 2...Input pressure chamber, 3...
Output pressure chamber, 5... Valve, 6... Exhaust seat, 7... Spring, 8... Air supply seat, 9... Output extraction path, 10...
Ventilation port, 11... Spring, 12... Input intake path, 1
5...Body, 28...Valve passage.

Claims (1)

[Claims for Utility Model Registration] Input pressure chamber 2 to which input pressure Pi is applied, and output pressure
An output pressure chamber 3 that outputs Po, a diaphragm 1 that partitions the input pressure chamber and the output pressure chamber and has buckling characteristics, an air supply chamber 21 that is supplied with supply pressure Ps, and the diaphragm and rod 4 a spherical valve 5 located at the boundary between the output pressure chamber and the air supply chamber; and an input that is in pressure contact with the valve through an adjustment screw 20 on the air supply chamber side and causes the diaphragm to buckle. A leaf spring 7 that determines the pressure difference between the pressure and the output pressure, and the adjustment screw adjusts the distance between the leaf spring and the valve to adjust the pressure difference that causes the diaphragm to turn on and off. Discontinuously operated pilot relay.