JPH045871B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pilot valve operated by pilot fluid pressure.

[Prior art] In recent years, there has been a growing need for small valves in order to reduce the installation space.Especially when multiple valves are installed in series on a manifold base for centralized control, the length of the manifold base has to be shortened. Therefore, a small valve is required.

However, the conventionally known pilot type valve is
The main valve body is driven by a pressure receiving body with a circular pressure receiving surface, so if the valve is made smaller, the pressure receiving area of the pressure receiving body decreases, and the driving force decreases proportionally, so the main valve body becomes smaller in diameter. There is a problem in that the fluid circulation ability is suppressed.

[Problems to be Solved by the Invention] The present invention aims to solve the problem by focusing on the fact that in a main valve having a plurality of ports, the length in the port opening direction is longer than the length in the direction orthogonal thereto. The problem is to provide a pilot-type valve that is small and has good fluid flow capacity.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a main valve having a plurality of ports opened substantially parallel to a plane including the axis of the main valve body, and a pilot valve, A pilot type valve in which the main valve body is driven by pilot fluid pressure applied to the pressure receiving body, characterized in that the pressure receiving surface of the pressure receiving body is non-circular, with the opening direction of the port being longer than the direction perpendicular thereto. It is said that

[Function] A main valve having multiple ports makes effective use of the characteristic that the length in the port opening direction is longer than the length in the direction perpendicular to this, and the pressure receiving surface of the pressure receiving body is By making this a non-circular shape that is longer than the orthogonal direction, even if the main valve is made smaller, the pressure-receiving area of the pressure-receiving body, in other words, the driving force of the main valve, does not decrease. The decline can be prevented.

[Embodiment] Figures 1 to 5 show a first embodiment of the present invention, and this pilot type valve includes a main valve 1 and a pilot solenoid valve 2, and as shown in Figure 3, a manifold base 3. It can be installed on top.

The valve box 5 of the main valve body 1 includes an axial through hole 6, a piston storage box 7 that closes both ends of the through hole 6, and an end plate 8. 10 into a pressurizing chamber 11 and an atmospheric chamber 12, the pressurizing chamber 11 is supplied with pilot fluid from the pilot solenoid valve 2,
The atmospheric chamber 12 communicates with the outside through a breathing port 13.

In the valve box 5, in the vertical direction in FIG. According to the valve box 5
The height in the vertical direction (port opening direction) in the figure is larger than the width in the direction perpendicular to this (see FIG. 2). The main valves 1, ... are as follows:
When installed on the manifold base 3 (see Figure 3), each port P, EA, EB is connected to the input passage 14 and discharge passage 15 opened on the manifold base 3.
A and 15B so as to communicate with each other individually.

The main valve body 16 slidably inserted into the through hole 6 is
When the pilot fluid is supplied to the pressurizing chamber 11, it is pressed by the piston 10, and the flow paths between the input port P and the output port A, and between the output port B and the discharge port EB are communicated, and the pilot fluid in the pressurizing chamber 11 is discharged. Then, due to the urging force of the return spring 17 and the acting force of the fluid pressure in the return chamber 18, the flow paths between the input port P and the output port B, and between the output port A and the discharge port EA are communicated with each other as shown in FIG. return to the state.

However, the main valve of the present invention is not limited to a 5-port valve, and may be driven by two pilot solenoid valves.

As shown in FIG. 4 and FIG. 6A, the guide tube portion 9 has a long length L in the port opening direction, a short length l in the direction perpendicular to this direction, and has four arcuate corners. It has a substantially rectangular cross section, and an opening 19 for supplying pilot fluid and a conduction groove 20 for pilot fluid are formed on the bottom surface of the piston storage box 7.
The piston 10, which is integrally formed of synthetic resin, has a similar shape to the guide cylinder part 9, and a seal packing 21 is installed between the guide cylinder part 9 and the groove 10a on the outer circumferential surface (see Fig. 1), and the main valve A pressing portion 10b for pressing the body 16 is provided.

The guide cylinder portion 9 and the piston 10 are not limited to the shapes shown in FIGS. 4 to 6A, as long as the opening direction of the port is longer than the direction perpendicular thereto, and, for example, the shape shown in FIG. 6B A shape with a semicircular short side as shown in Figure C, an ellipse as shown in Figure C, or an arc R with no straight line and at least three radii of curvature as shown in Figure D
1, R2, and R3 can be made into a continuous shape, and in any case, the pressure receiving area is larger than that of the known pressure receiving body 24 shown by the two-dot chain line, so the driving force of the pressure receiving body can be increased. can.

The pilot solenoid valve 2 supplies the pilot fluid supplied from the input port P through the pilot passage 22 to the pressurizing chamber 11 from the opening 19 by energizing the solenoid, and stops the supply of pilot fluid by de-energizing the solenoid. Along with blocking the
It is composed of a well-known three-port solenoid valve that communicates the pressurized chamber 11 with the outside. However, the pilot valve of the present invention is not limited to a solenoid valve, but may be operated by fluid pressure, for example.

Reference numerals 23, . . . in FIG. 4 indicate the piston storage box 7.
This is the mounting hole.

Next, the operation of the first embodiment will be described.

When the solenoid of the pilot solenoid valve 2 is energized in the state shown in FIG. It moves to the left in the figure against the acting force of , so the flow paths between ports P and A and between ports B and EB communicate with each other.

In this case, by making the piston 10 non-circular so that the length in the port opening direction is longer than in the direction perpendicular to this, the pressure receiving area is larger than that of a known pilot type valve, and even if the valve is made small, the driving force can be reduced. Since this does not reduce the fluid flow capacity, it is possible to prevent the fluid flow ability from decreasing due to downsizing.

When the solenoid is de-energized, the pressurizing chamber 11 is connected to the outside, so the piston 10 and the main valve body 1
6 is returned to the illustrated state by applying the urging force of the return spring 17 to the fluid pressure of the return chamber 18, and the flow paths between the ports P and B and between the ports A and EA are communicated.

FIG. 7 shows a modification of the piston, and the piston 26 in FIG. 7A has conduction grooves 26b, . Each has a notch 26c, which is open at one end, and thereby pressurizes the seal gasket (see FIG. 1) attached to the outer circumferential groove 26a to seal the space between it and the guide tube 9. The piston 27 of B is connected to the pressurizing chamber 1 for the same purpose.
Pressure introduction hole 27 opening to outer circumferential groove 27a on side 1
b, 27b, and cutouts 27c, . . . on the long sides and corners.
Each is equipped with

FIG. 8 shows a modification of the first embodiment, in which the valve box 32 of the main valve 31 has an output port (not shown) opened on the same surface as the input port P and the discharge ports EA, EB. The output port of
The output ports 34, . . . are individually connected to output ports 34, . The other configurations and operations of the above modification are the same as those of the first embodiment, so the same reference numerals are given to the main parts in the drawings, and detailed explanations will be omitted.

FIG. 9 shows an embodiment, in which a piston storage box 42 attached to a main valve 41 in the second embodiment includes a guide cylinder part 43 whose inner peripheral surface has the same shape as in the first embodiment, and a cover that closes one end of the guide cylinder part 43. 44, the pressure receiving body is composed of a piston 45 and a diaphragm 46, and the diaphragm 46, which partitions the pressurizing chamber 11 and the atmospheric chamber 12, has an outer peripheral edge sandwiched between the cylindrical portion 43 and the cover 44, and an inner The peripheral edge is fixed to the outer peripheral surface of the piston 45.

The other configurations and operations of the second embodiment are the same as those of the first embodiment, so the same reference numerals are given to the main parts in the drawings, and detailed explanations will be omitted.

[Effects of the Invention] In the pilot-type valve of the present invention, the pressure-receiving surface of the pressure-receiving element that drives the main valve element is made into a non-circular shape whose length in the port opening direction is longer than the direction orthogonal to this, thereby making the valve compact. However, since there is no reduction in the pressure-receiving area of the pressure-receiving body, there is no reduction in the driving force, and therefore, it is possible to prevent a reduction in fluid circulation ability.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the main part of the first embodiment of the present invention, Fig. 2 is a top side view of the same, Fig. 3 is a perspective view showing the state in which the valve is arranged on the manifold, and Fig. 4 is a piston storage. A perspective view of the box, FIG. 5 is a perspective view of the piston, FIGS. 6 A to D are views showing the shape of the guide cylinder, FIGS. 7 A and B are perspective views of modified examples of the piston, and FIG. 8 is a perspective view of the main piston. FIG. 9 is a perspective view of a modified example showing a state in which the valve is arranged in series on a manifold, and FIG. 9 is a longitudinal sectional front view of the main part of the second embodiment of the present invention. 1, 31, 41... Main valve, 2... Pilot solenoid valve, 10, 26, 27, 45... Piston, 16...
Main valve body, 46...Diaphragm, P, A, B, EA,
EB…Port.

Claims (1)

[Scope of Claims] 1. A main valve having a plurality of ports opened substantially parallel to a plane including the axis of the main valve body, and a pilot valve. A pilot-type valve for driving a valve body, characterized in that the pressure-receiving surface of the pressure-receiving body has a non-circular shape in which the opening direction of the port is longer than the direction orthogonal to the pressure-receiving surface.