JPH043186Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pilot valve operated by pilot fluid pressure.

[Prior Art] Pilot-type valves that drive a main valve body by applying pilot fluid pressure to a piston that slides on a guide cylinder are already known.

However, since the known pilot type valve is composed of a main valve, a piston storage box provided with a guide tube, and a pilot valve, the overall structure of the valve is complicated and assembly is troublesome.

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to provide a pilot type valve that has a simple structure and is easy to assemble.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a main valve having a plurality of ports and a pilot valve, and controls the pilot fluid pressure to act on the piston sliding on the guide cylinder. Therefore, in a pilot type valve that drives a main valve body, the pilot valve box of the pilot valve includes the guide cylinder part, a pilot discharge valve seat opening into the guide cylinder part, and a plurality of guide convex parts, The plurality of guide protrusions include a first guide surface that guides the piston in cooperation with a guide surface of the piston, and a second guide surface that guides a discharge valve element that opens and closes the pilot discharge valve seat. It is characterized by the presence of

[Function] Since the pilot valve box includes a piston guide tube and a pilot discharge valve seat that opens into the guide tube, the piston storage box can be omitted.
The valve has a simple configuration and is easy to assemble.

Furthermore, the plurality of guide protrusions provided on the pilot valve box are provided with a first guide surface that guides the piston together with the guide surface of the piston, and a second guide surface that guides the discharge valve body. The piston slides smoothly without tilting, and the discharge valve body reliably seals the valve seat, thereby preventing seal failure.

[Example] Figures 1 to 3 show examples of the present invention,
This pilot type valve includes a main valve 1 and a pilot solenoid valve 2.

The valve box 5 of the main valve 1 is provided with an axial through hole 6,
Its both ends are closed by a pilot valve box 7 and an end plate 8, and a bottomed guide cylinder portion 9 formed in the pilot valve box 7 is connected to a pressurizing chamber 11 on the bottom side and a pressurizing chamber 11 on the bottom side by a piston 10. The pressurized chamber 1 is divided into atmospheric chambers 12 and
1 is supplied with pilot fluid from the pilot solenoid valve 2, and the atmospheric chamber 12 communicates with the outside through a breathing port 13.

Further, the valve box 5 is arranged in the vertical direction in FIG.
Pressure fluid input ports P, discharge ports EA, EB, and output ports A, B are opened, and the tips of the pressure fluids open into the through holes 6, respectively. port opening direction)
The height is greater than the width in the direction perpendicular to the height.

Main valve body 16 slidably inserted into the through hole 6
When the pilot fluid is supplied to the pressurized chamber 11,
Pressed by the piston 10, the input port P and the output port A, and the output port B and the discharge port
When the flow path between EB is connected and the pilot fluid in the pressurizing chamber 11 is discharged, the input port P is
and output port B, and output port A and discharge port
The flow paths between the EAs are brought into communication and the state shown in FIG. 1 is restored.

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

As shown in FIG. 2, 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 a substantially rectangular cross section with four arcuate corners. , an opening 19 for pilot fluid supply (see Fig. 1), a discharge valve seat 20, and a plurality of guide convex portions 21 surrounding the discharge valve seat 20 are formed on the bottom surface of the pilot fluid supply. Pilot fluid introduction passages 22, . . . are formed between the portions 21, .

On the other hand, the piston 10 is integrally formed of synthetic resin.
has a similar external shape to the guide cylinder part 9, and the pressurizing chamber 1
A seal packing 2 is provided with a guide surface 10a on the first side and seals between the groove 10b on the outer circumferential surface and the guide cylinder part 9.
3 is attached (see Figure 1). The guide surface 10a has an inner surface similar to the outer shape of the piston, and the first guide surface 2 of the guide protrusion 21, which guides the piston 10 in cooperation with the guide surface 10a.
1a, . . . are arranged to face the four corners of the guide surface 10a.

However, the guide tube portion 9, the piston 10, and the guide surface 10a are not limited to the shapes shown in FIGS. 2 and 3, and may be used as long as the length in the port opening direction is longer than the direction orthogonal thereto. As a result, the pressure receiving area becomes larger than that of a known circular piston whose diameter is the short side of the rectangle, so the driving force of the piston can be increased.

The pilot solenoid valve 2 includes a solenoid 26 attached to the pilot valve box 7 and a pilot supply valve seat 2.
7. The pilot discharge valve seat 20, the supply valve body 28 and the discharge valve body 2 that open and close these valve seats 27, 20.
9, and a valve body return spring 30, the supply valve seat 27
communicates with the input port P through a pilot passage 31, and the discharge valve body 29 is made movable together with the supply valve body 28 by a push rod or the like (not shown), and the guide convex portions 21,... It is guided by the second guide surface 21b, formed on the center side of..., and is biased in the direction of opening the pilot discharge valve seat 20 by the spring 32, which has a stronger biasing force than the valve body return spring 30. Forced.

In the pilot solenoid valve 2, when the solenoid 26 is energized, the supply valve body 28 opens the supply valve seat 27 and the discharge valve body 29 closes the discharge valve seat 20, and when the solenoid 26 is de-energized, the spring 3
The supply valve body 28 is pushed against the supply valve seat 27 by the biasing force of 2.
The discharge valve body 29 closes the discharge valve seat 20.
to open.

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

In the state shown in FIG.
When excited, the supply valve body 28 opens the supply valve seat 27 and the discharge valve body 29 closes the discharge valve seat 20, so that pilot fluid is supplied to the pressurizing chamber 11.
Since the piston 10 and the main valve body 16 move to the left in the figure against the urging force of the return spring 17 and the acting force of the fluid pressure in the return chamber 18, ports P, A, B, and EB
The flow path between them communicates with each other. Furthermore, when the solenoid 26 is de-energized, the supply valve body 28 closes the supply valve seat 27 and the discharge valve body 29 opens the discharge valve seat 20, so that the pressurizing chamber 11 communicates with the outside. The main valve body 16 is returned to the illustrated state by the action of the return spring 17 and the fluid pressure of the return chamber 18, and the flow paths between ports P and B and A and EA are communicated.

In this case, by making the pressure-receiving surface of the piston 10 non-circular, the length of which is longer in the port opening direction than in the direction perpendicular to this, the pressure-receiving area is larger than that of a known pilot-type valve, and the valve can be made smaller. However, since the driving force does not decrease, it is possible to prevent the fluid flow ability from decreasing due to downsizing.

Moreover, since the piston 10 is guided by the guide surface 10a and the first guide surface 21a, . . . , the piston 10 is not tilted even if it is non-circular, and the pressing force is made uniform, so that it slides smoothly. . Therefore, wear of the seal packing 23 and the like is reduced, and the life of the valve can be extended.

Further, the discharge valve body 29 is connected to the second guide surface 20
Since the valve body 29 is guided by b, .

[Effects of the invention] The pilot valve of the invention has a pilot valve box equipped with a guide tube for the piston and a pilot discharge valve seat that opens into the guide tube. Since there is no need to provide a valve, the configuration of the valve is simple and easy to assemble, and the axial length of the entire valve can be shortened.

Further, the plurality of guide protrusions provided on the pilot valve box are provided with a first guide surface that guides the piston in cooperation with the guide surface of the piston, and a second guide surface that guides the discharge valve body. As a result, the piston slides smoothly without being tilted and wear on the sliding portion is reduced, thereby extending the life of the main valve and preventing seal failures due to the tilt of the discharge valve body.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the main part, and FIGS. 2 and 3 are perspective views of a pilot valve box and a piston. DESCRIPTION OF SYMBOLS 1... Main valve, 2... Pilot valve, 7... Pilot valve box, 9... Guide cylinder part, 10... Piston, 10a, 21a, 21b... Guide surface, 16...
...Main valve body, 20...Pilot discharge valve seat, 21...
...Guiding convex portion, 29...Discharge valve body, P, A, B,
EA, EB...Port.

Claims (1)

[Claims for Utility Model Registration] A pilot-type valve comprising a main valve having a plurality of ports and a pilot valve, in which the main valve body is driven by pilot fluid pressure applied to a piston sliding on a guide cylinder. , the pilot valve box of the pilot valve includes the guide cylinder part, a pilot discharge valve seat opening in the guide cylinder part, and a plurality of guide protrusions, and the plurality of guide protrusions are arranged on the guide surface of the piston. A pilot-type valve comprising: a first guide surface that guides a piston in cooperation with the pilot discharge valve seat; and a second guide surface that guides a discharge valve element that opens and closes the pilot discharge valve seat.