JPH07788Y2 - Pilot type valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pilot type valve that operates by pilot fluid pressure.

[Prior Art] A valve body having a plurality of ports through which pressurized fluid flows is provided with a main valve body that switches a communication state between these ports and a piston that drives the main valve body, and the piston is used as a pilot. A pilot type valve that is driven by fluid pressure to switch the main valve body is already known.

However, in the known pilot type valve of this type, since the piston chamber into which the piston is slidably inserted is directly formed in the valve box, the piston chamber must always be formed of the same material as the valve box. It has been impossible to form only the piston chamber using another material suitable for sliding the seal packing in order to improve the slidability of the piston.

Further, the valve box has a cross-sectional shape in which the length in the longitudinal direction along the opening direction of the port is longer than the length in the lateral direction due to the relation that ports are provided on the upper and lower surfaces. Since the chamber and piston are usually circular in cross-section, they cannot be made too large due to the lateral length of the valve box, which makes it difficult to enlarge the piston and increase the driving force. Met.

[Problem to be Solved by the Invention] The problem to be solved by the present invention depends on the material of the valve box by forming the piston chamber using a material suitable for sliding of the seal packing different from the valve box. (EN) Provided is a pilot type valve capable of improving the slidability of a piston without being restricted, and increasing the driving force by enlarging the piston without enlarging the valve box. Especially.

[Means for Solving the Problems] In order to solve the above problems, the present invention is provided with a plurality of ports through which a pressure fluid flows, and the cross-sectional shape in which the longitudinal length along the opening direction of the ports is longer than the lateral length. In the valve box with
A main valve provided with a main valve body for switching the communication state between each port and a piston for driving the main valve body; a pilot valve for switching the main valve body by driving the piston with pilot fluid pressure; In a pilot type valve equipped with
A guide cylinder, which is made of a synthetic resin material suitable for sliding a seal packing provided on the piston and has a hollow portion for slidably accommodating the piston, is fitted into a valve box, and the guide cylinder is It is characterized in that the hollow portion and the piston have a cross-sectional shape in which the length in the vertical direction is longer than the length in the horizontal direction.

[Operation] A hollow guide cylinder is formed of a synthetic resin material suitable for sliding the seal packing, the guide cylinder is fitted in the valve box, and the piston is slidably accommodated in the hollow part. Therefore, it is possible to improve the slidability of the piston and prevent wear of the seal packing without being restricted by the material of the valve box.

In addition, according to the cross-sectional shape of the valve box in which the length in the vertical direction along the opening direction of the port is longer than the length in the horizontal direction, the hollow portion of the guide cylinder and the piston are longer in the lengthwise direction than the length in the horizontal direction. Since the cross-sectional shape is used, the pressure receiving area of the piston can be increased as much as the length in the vertical direction is increased and the driving force can be increased as compared with the conventional circular piston.

[Embodiment] FIGS. 1 to 3 show an embodiment of a pilot type valve of the present invention. The pilot type valve includes a main valve 1 and a pilot solenoid valve 2.

The valve box 5 of the main valve 1 has a through hole 6 provided in the axial direction.
And a mounting hole 8 formed at one end of the through hole 6 for fitting a guide cylinder 7 to be described later, and both ends of the valve box 5 are closed by end plates 9 and a holding plate 10. ing. Further, in the valve box 5, the pressure fluid input port P and discharge ports EA, EB, and output ports A, B are arranged in the vertical direction in FIG.
Are formed so as to open in the through holes 6, respectively, and by forming these ports, the cross-sectional shape of the valve box 5 is such that the height in the vertical direction (port opening direction) in FIG. 1 is orthogonal to this. It is longer than the width in the horizontal direction.

The mounting hole 8 has a length in the vertical direction longer than the length in the horizontal direction in accordance with the shape of the valve box 5 in which the height in the port opening direction is longer than the width in the horizontal direction orthogonal thereto. The guide cylinder 7 mounted in the mounting hole 8 is also formed into a substantially rectangular shape with four corners being arcs, and a hollow portion that forms a piston chamber inside the guide cylinder 7. 7a is
It is divided into a pressurizing chamber 13 and an atmospheric chamber 14 by a piston 12 that slides inside, the pilot fluid is supplied from the pilot solenoid valve 2 to the pressurizing chamber 13, and the atmospheric chamber 14 communicates with the outside by a breathing port 15. There is.

The guide cylinder 7 is integrally formed of a synthetic resin suitable for sliding the seal packing 20 as a whole, and has a hollow portion 7a inside the guide cylinder 7 and a piston 12 that slides inside the hollow portion 7a.
Is formed in a substantially rectangular cross section similar to the mounting hole 8 and the guide cylinder 7. Therefore, as compared with a known circular piston whose diameter cannot be made too large due to the restriction of the lateral length of the valve box, the length in the longitudinal direction can be increased, so that the pressure receiving area of the piston 12 is increased. In other words, compared with the case where a known circular piston is used, even if the lateral length of the valve box 5 is reduced and the main valve is downsized, the pressure receiving area of the piston 12 does not decrease. There is no decrease in force or deterioration in fluid flow performance. Further, even if the hollow portion 7a and the piston 12 are formed into a substantially rectangular shape, they can be easily formed of synthetic resin or the like, and the guide cylinder 7 and the hollow portion 7a can be easily processed.

However, the mounting hole 8, the hollow portion 7a and the piston 12 are
The shape is not limited to the illustrated shape, and may be, for example, a long ellipse in which the major axis is oriented in the vertical direction, which is the opening direction of the port, and the minor axis is oriented in the lateral direction orthogonal to this.

The main valve body 16 in which the through hole 6 is slidably inserted is pressed by the piston 12 when the pilot fluid is supplied to the pressurizing chamber 13, and is pressed between the input port P and the output port A, and between the output port B and the discharge port EB. When the flow path between them is made to communicate with each other and the pilot fluid in the pressurizing chamber 13 is discharged, the urging force of the return spring 17 and the acting force of the fluid pressure acting on the return chamber 18 return to the state shown in FIG. The flow paths are connected between the input port P and the output port B, and between the output port A and the discharge port EA. However, the main valve of the present invention is not limited to the 5-port valve, and may be driven by two pilot solenoid valves.

On the other hand, the pilot solenoid valve 2 supplies the pilot fluid supplied from the input port P through the pilot passage 19 to the pressurizing chamber 13 by exciting the solenoid, and shuts off the supply of the pilot fluid by deenergizing the solenoid. At the same time, the pressurizing chamber 13 is constituted by a well-known 3-port solenoid valve. However, the pilot valve of the present invention is not limited to the solenoid valve, and may be operated by fluid pressure, for example.

The reference numerals 21, ... In FIG. 2 denote screw holes for attaching the holding plate provided in the valve box 5.

Next, the operation of the pilot type valve of the above embodiment will be described.

When the solenoid of the pilot solenoid valve 2 is excited in the state shown in FIG. 1, the pilot fluid pressure is supplied to the pressurizing chamber 13, and the piston 12 and the main valve body 16 are biased by the return spring 17 and the fluid in the return chamber 18. Since it moves to the left in the figure against the acting force of the pressure, the flow paths between the ports P and A and between B and EB communicate with each other.

In this case, since the hollow portion 7a of the guide cylinder 7 and the piston 12 are formed in a substantially rectangular shape whose length in the port opening direction is longer than the lateral length orthogonal to this, the pressure receiving area is increased and the valve Since the driving force does not decrease even if the size is reduced, it is possible to prevent the fluid flow performance from being deteriorated due to the size reduction.

Further, the guide cylinder 7 is formed of synthetic resin separately from the valve box 5, and is attached to the valve box 5 to form the piston chamber by the hollow portion 7a. Valve box 5
It is possible to form a synthetic resin material suitable for sliding of the seal packing 20 irrespective of the material constituting the above, which can improve the slidability of the piston, and the molding and sealing surface of the synthetic resin. Precision processing can also be easily performed.

When the solenoid is de-energized, the piston 12 and main valve disc
16 is returned to the state shown in FIG. 1 by the urging force of the return spring 17 and the acting force of the fluid pressure in the return chamber 18, and the flow paths between the ports P and B and between A and EA communicate.

FIG. 4 shows a guide cylinder having a hollow portion for forming a piston chamber.
2 shows a second embodiment of the present invention in which 25 and the holding plate 26 are integrally formed.

According to the second embodiment, by mounting the guide cylinder 25 in the mounting hole 8, the pressing plate 26 can be automatically attached to a predetermined position of the valve box 5, so that the assembly is easy. .

Since the other structure and operation of the second embodiment are the same as those of the first embodiment, detailed description will be omitted.

[Advantage of the Invention] According to the pilot type valve of the present invention, a hollow guide cylinder is formed of a synthetic resin material suitable for sliding the seal packing, and the guide cylinder is fitted into the valve box and the hollow Since the piston is slidably accommodated in the portion, it is possible to improve the slidability of the piston and prevent wear of the seal packing without being restricted by the material of the valve box.

In addition, according to the cross-sectional shape of the valve box whose longitudinal length along the opening direction of the port is longer than its lateral length, the hollow part of the guide cylinder and the piston should have a cross section whose longitudinal length is longer than its lateral length. Since the shape is adopted, the pressure receiving area of the piston can be increased and the driving force can be increased as compared with the conventional circular piston due to the non-circular shape and the longer length in the vertical direction.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional front view of a main portion of a pilot type valve according to a first embodiment of the present invention, FIG. 2 is a perspective view of a main portion of a valve box of the pilot type valve of FIG. 1, and FIG. Same as above, FIG. 4 is a perspective view of a guide cylinder, and FIG. 4 is a perspective view of essential parts showing a guide cylinder and a holding plate in the pilot type valve of the second embodiment. 1 …… Main valve, 2 …… Pilot solenoid valve 5 …… Valve box, 7,25 …… Guide cylinder 7a …… Hollow part, 12 …… Piston 16 …… Main valve body, 20 …… Seal packing P, A, B, EA, EB ... Port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Ishikawa 6-19-1 Inari, Soka-shi, Saitama SMC Co., Ltd. grass processing plant (72) Inventor Yoshio Aso 6-19-1 Inari, Soka-shi, Saitama SMC Inside the grass processing plant (56) References Actual development Sho-49-114358 (JP, U) Actual development Sho-52-143591 (JP, U) Japanese Patent Sho-48-4970 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A valve box having a plurality of ports through which a pressure fluid flows and having a cross-sectional shape in which the length in the longitudinal direction along the opening direction of the ports is longer than the length in the lateral direction, the communication state between the ports is switched. A pilot-type valve comprising: a main valve having a main valve body and a piston for driving the main valve body; and a pilot valve for driving the piston with pilot fluid pressure to switch the main valve body. A guide cylinder body made of a synthetic resin material suitable for sliding a seal packing provided on the piston and having a hollow portion for slidably accommodating the piston inside is fitted into a valve box; A pilot type valve characterized in that the hollow portion and the piston have a cross-sectional shape in which the length in the vertical direction is longer than the length in the horizontal direction.