JPS6018708Y2 - Poppet type 3 position directional control valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a three-position directional control valve.

(Prior Art) Conventional 3-position directional control valves, particularly check valve type 300 million-position directional control valves whose valve structure is composed of check valves, are connected to an actuator and when the actuator is stopped intermediately, the actuator If an impact is applied to the valve, the check valve in the neutral state that seals between each port will temporarily open, creating a risk that the intermediate stop function will be impaired.

In other words, since a check valve is used, it is not possible to maintain pressure balance, and the sealing state becomes unstable due to pressure fluctuations, resulting in the inconvenience that the actuator cannot be held in the intermediate position for a long time. It is.

(Purpose of the invention) Therefore, the present invention provides a poppet type 3-position directional control valve that can appropriately balance the valve body pressure, thereby making it possible to reliably maintain a sealing state without being affected by pressure fluctuations on the actuator side. The purpose of this invention is to perform intermediate stop control of actuators safely and appropriately.

(Structure and effect of the device) In order to achieve the above object, the poppet type three-position directional control valve of the present invention has the following features: (a) A supply passage, two consumer connection ports, and two discharge ports. A cylindrical sleeve 10.11, 12, 13.14 having a plurality of holes drilled through it into the through-hole 2 of the main body 1 and communicating with one of the five ports, and an annular valve seat between each cylindrical sleeve. 15at 15bt 15C? 1
(b) Exhaust side poppet valve body 16.17 having cylindrical portions 16b and 17b formed inside the cylindrical sleeve 13.14 and in contact with the annular valve seats 15a and 15d on one end side. (c) an annular valve seat 1 located within the cylindrical sleeve 10 and sandwiched between cylindrical sleeves 11 and 12 located on both sides thereof;
5b and 15c to form a valve portion.
20a, and the opposite end outer diameter portions 19b and 20b, which have subsequently contracted in diameter and expanded, are the exhaust side poppet valve body 16.17.
a supply-side poppet valve body 19.20 configured to fit within the thin-walled cylindrical portions 16b, 17b of the supply-side poppet valve body 19.20; ) is fitted through the center portions of the exhaust poppet valve bodies 16, 17 and the supply poppet valve bodies 19, 20, and is fitted between the exhaust poppet valve body 16 and the supply poppet valve body 19 and between the exhaust side poppet valve bodies 16, 17 and the supply side poppet valve bodies 19, 20. 17 and supply side poppet valve body 20
Valve mechanism action collars 22 a and 23 a protrude between each other.
and each valve body operating rod 22, 23 whose inner end surfaces, each having a through hole 22b, 23b which communicates the inside 1f of the valve body and each back chamber Igih along the longitudinal direction, can come into contact with each other. , (f) Piston 31 that presses the valve body operating rods 22 and 23.
(g) normally open type pilot valves 33, 34 for switching the fluid pressure that presses the pistons 31 and 32;
(7) Furthermore, each annular valve seat 15 a, 15 b,
15 c.

The inner diameter D□ of 15d, the inner diameter D2 of each thin-walled cylindrical portion 16b, 17b of the exhaust side poppet valve body 16, 17, and the outer diameter D3 of the supply side poppet valve body 19, 20 are configured to be approximately the same diameter. This is a poppet type 3 position directional control valve.

In particular, in the above configuration, the inner diameter D1 of the annular valve seat constituting the poppet valve structure, the outer diameter D3 of the supply poppet valve element, and the inner diameter D3 of the thin-walled cylindrical part of the exhaust poppet valve element are approximately the same diameter. By the supply side poppet valve body 19.2
The pressure receiving areas in the longitudinal direction of 0 are made almost equal, and the pressure from the supply port 5 is transferred to the through holes 22b of the valve body operating rods 22 and 23,
Back chamber 1g, 1 of poppet valve body 16.17 via 23b
h to balance the pressure on the valve body so that the sealing force of the poppet valve on the supply side to the annular valve seat does not change due to pressure fluctuations on the actuator side. be.

(Example) An example of the present invention will be described in detail based on the drawings. A through hole 2 is bored along the central longitudinal direction of the valve body 1, and grooves 1a are formed at regular distances within the through hole 2. lb, lc, ld, l
e, and each groove has a groove 1 perpendicular to the through hole 2.
Each opening 5, 6, 7, 8, 9 for each individual is bored so as to communicate with the outside.

The valve body 1 is formed by penetrating a single through hole 4 that communicates with the groove 1c of the central opening 5 between the side ends in a state parallel to the longitudinal direction.

Here, opening 5 is used as a supply port, and openings 6 and 7 are each used as a supply port.
The openings 8 and 9 are respectively discharge ports.

In the through hole 2 of the valve body 1, there is a hole 10 around the cylindrical periphery.
Cylindrical sleeves 10, 11, 12, 13, each having a plurality of holes a, lla, 12a, 13a, and 14a perforated therethrough.
14 to the corresponding holes 10a, 11a, 12a, 13av 1
4a is the groove 1c in sequence.

lb, ld, la, and le, and an annular valve seat 15a made of an elastic material is fitted between the sleeves.
, 15b, 15c, and 15d, respectively.

Among the cylindrical sleeves fitted in the valve body 1, an annular valve seat 15a is provided inside the cylindrical sleeves 13 and 14 on one end side.
, 15d, and a thin cylindrical portion 16b having end surfaces 16a and 17a that come into contact with the end faces 16a and 17a.

An exhaust side poppet valve body 16.17, which is similar to 17b, is fitted in an axially slidable position.

Further, outer diameter portions 19a, 20a located inside the cylindrical sleeve 10 and abut against the annular valve seats 15b, 15c sandwiched between the cylindrical sleeves 11, 1 and 2 located on both sides of the cylindrical sleeve 10 to form a poppet valve. and an outer diameter portion 19b that is fitted into the thin-walled cylindrical portions 16b and 17b of the exhaust side poppet valve bodies 16 and 17 at the longitudinal end portion that is subsequently expanded with a reduced diameter.
, 20b is mounted in a tensioned state by a spring 26 so that its normal outer diameter portions 19a, 20a abut respective annular valve seats 15b, 15c.

Further, valve element operating rods 22 and 23 are fitted through the inner centers of the exhaust side poppet valve elements 16 and 17 and the supply side poppet valve elements 19 and 20, with their inner end surfaces abutting each other.

The intermediate position of the valve element operating rod 22° 23, that is, the position between the exhaust side poppet valve element 16 and the supply side poppet valve element 19 and between the exhaust side poppet valve element 17 and the supply side poppet valve element 20 is as follows.
A valve body operating collar 22a*23a is provided.

Small diameter holes 27a, 2 with the same axis are provided at both ends of the valve body 1.
8 and an intermediate body 27 having large diameter holes 27b and 28b.
, 28 are respectively assembled, and the small diameter holes 27aw28a of the intermediate bodies 27, 2B are provided with packings 29.
30 is interposed and pistons 31 and 32 are slidably received therein.

Slit grooves 31b and 32b are formed on the end surface of the piston 31, 32 on the valve body operating rod pressing side.

Furthermore, supply ports 33a, 34a communicating with the through hole 4 of the valve body 1 are provided inside one end surface of each of the intermediate bodies 27, 2B.
and connecting ports 33b, 34b for pressing the pistons 31, 32 of the intermediate bodies 27, 2B with pressurized air from the supply port 33a134, and an exhaust port 33ct34c for discharging the pressurized air to the outside by reverse operation. The normally open type pilot valves 33 and 34 are integrally assembled to constitute an integral directional control valve as a whole.

In addition, in FIG. 1, the valve body operating rod 22t23 has through holes 22b, 23b in the longitudinal direction, and is configured so that the pressure 3 from the supply port 5 is also applied to the back chambers 1g, 1h of the exhaust side poppet valve body 16.17. ing.

In the drawings, 18.21, 24, 25, and 29.30 indicate sealing members such as O-rings.

To explain the operation of the present invention, the supply port 5 is connected to an air pressure supply source, and each outlet port 6, 7 is connected to the actuator 3.
When pressurized air is supplied from the supply port 5 as shown in FIG. 1 after connecting to 19.20 are pressure-sealed to the elastic annular valve seats 15b and 15c by the spring 26, so that
It does not flow out to other openings other than the supply port 5.

Of course, the pressurized sealing force at this time is aided by the supplied pressurized air.

At the same time, the pressurized air supplied from the supply port 5 flows into the back chamber 1g1h of the exhaust side poppet valve body 16.17 through the central through holes 22b and 23b of the valve body operation rods 22 and 23, and flows into the back chamber 1g1h of the exhaust side poppet valve body 16.17. The bodies 16 and 17 are elastic bodies and an annular valve seat 15d.

15a to seal the take-out lower and the discharge port 9 and the take-out port 6 and the discharge port 8.

Therefore, the left and right chambers of the actuator do not communicate with the atmosphere.

Next, when the pilot valve 33 is turned ON, the pressure air supplied from the supply port 5 is transferred to the pilot valve 33 as shown in FIG.
and the large diameter hole 27b of the intermediate body 27 via the connection port 33b.
At the same time, the piston 31 slides the valve body operating rod 22 to the left and supplies it with the flange 22a provided on the valve body operating rod 22. While hooking the side poppet valve body 19, the supply side poppet valve body 19 is slid to the left to separate the supply side poppet valve body outer diameter portion 19a and the elastic annular valve seat 15c.

At the same time, other valve body operating rods 23 that are in contact with the inner end surface of the valve body operating rod 22 are also common, so the exhaust side poppet valve body 17 is simultaneously moved to the left by the flange 23a of the valve body operating rod 23. The end surface 17a of the exhaust side poppet valve body 17
and the elastic annular valve seat 15a are separated.

By switching the valve, the pressurized air supplied from the supply port 5 flows into the extraction lower through the hole 12a of the cylindrical sleeve 12.

At the same time, the pressurized air from the outlet 6 passes through the hole 11a of the cylindrical sleeve 11 and the hole 13a of the cylindrical sleeve 13, and is discharged to the atmosphere from the outlet 8.

Therefore, the actuator 3 moves to the left.

Next, when the pilot valve 33 is turned OFF and the pilot valve 34 is turned ON, as shown in FIG.
It is discharged into the atmosphere through the pilot valve 33 and the exhaust port 33c.

At the same time, the pressurized air supplied from the supply port 5 flows into the large diameter hole 28b of the intermediate body 28 via the pilot valve 34 and the connection port 34b, presses the piston 32 and slides to the right, and at the same time, the piston Reference numeral 32 denotes a flange portion 23 provided on the valve body operation rod 23 for slidingly moving the valve body operation rod 23 from side to side.
While hooking the supply side poppet valve body 20 at point a, the supply side poppet valve body outer diameter portion 20a and the elastic annular valve seat 15b are separated.

At the same time, the other valve body operating rod 22 that is in contact with the inner end surface of the valve body operating rod 23 also moves together, so that the exhaust side poppet valve body 16 is simultaneously moved to the right by the flange 22a of the valve body operating rod 22. The end face 16a of the exhaust side poppet valve body 16
and the elastic annular valve seat 15d are separated.

Pressure air supplied from the supply port 5 by switching the valve is supplied to the hole IL of the cylindrical sleeve 11.

It flows into the outlet 6 through the.

At the same time, the pressurized air from the take-out lower is discharged to the atmosphere from the exhaust port 9 through the holes 12a of the cylindrical sleeve 12 and the holes 14a of the cylindrical sleeve 14.

Therefore, the actuator 3 moves to the right.

To perform intermediate stop control of the actuator, turn on the pilot valve 33, move the actuator 3 forward (to the left in the figure) as shown in Fig. 2, and turn off the pilot valve 33 in the middle of the stroke. It is something.

In this case, since both the pilot valves 33 and 34 are in the OFF state, the pilot valve 33 is passed from the supply port 5 through the through hole 4.
．． The pressurized air leading to 34 is closed and the intermediate bodies 27, 2
The pressurized air flowing into the piston 31.32 and pressing the piston 31.32 is discharged into the atmosphere from the exhaust port 33C934c of the pilot valve 33, 34, so the inward pressing force of the piston 31.32 is released. .

Therefore, from the supply port 5 to the through holes 22b, 23 of the valve body operating rod.
1g in the end chamber of the exhaust side poppet valve body 16.17 via b
, lh, the pressurized air flows through the exhaust side poppet valve body 16.
, 17, the end surfaces 16a, 17a of the annular valve seats 15a, 15d
the exhaust side poppet valve body 16.
．． 17 toward the center.

At the same time, the supply side poppet valve bodies 19 and 20 are
6 causes the outer diameter portions 19a and 20a to respectively open the annular valve seat
5b, 15c, and the valve body operating rods 22, 23 are also moved outward until they come into contact with the valve body operating flange 22a,
23a are moved by being pushed by the exhaust side poppet valve body 17 and the supply side poppet valve body 19, respectively, and return to the position shown in FIG. 1.

In this way, the outlet ports 6, 7 and the outlet ports 8, 9 are sealed,
The actuator 3 can be stopped mid-stroke.

Here, to explain the means for balancing the pressure of the valve body, Fig. 4 is an enlarged view of one side of the exhaust side and supply side poppet valve parts when the actuator 3 is stopped in the middle, and this state is shown in Fig. 4. , the inner diameter D2 of the thin-walled cylindrical portion 16b of the exhaust-side poppet valve body 16, the outer diameter D3 of the supply-side poppet valve body outer-diameter portion 19b fitted into this thin-walled cylindrical portion, and the inner diameter D□ of the annular valve seats 15c and 15d. Di respectively
The cape D2 #D is configured to be approximately equal to the pressure receiving area in the longitudinal direction of the supply side poppet valve body 19, and the annular shape of the supply side poppet valve body 19 is Sealing to valve seat 15C
It has been devised so that the force does not fluctuate.

In other words, even if the pressure on the actuator 3 side fluctuates, the force applied in the longitudinal direction of the supply poppet valve element 19 is balanced, so that the supply poppet valve element does not move in the longitudinal direction. 19 annular valve seat 15c
This is so that it does not affect the sealing force to the

Although FIG. 4 shows only one side of the poppet valve, the opposite side is constructed in the same manner.

(Effects of the invention) Since the present invention has the above-described configuration, it is possible to reliably maintain a sealed state without being affected by pressure fluctuations on the actuator side, and enables safe and appropriate intermediate stop control of the actuator. It is something.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of this embodiment, Fig. 2 is a front sectional view of the embodiment in one direction, Fig. 3 is a front sectional view of the embodiment in the opposite direction from Fig. A partially enlarged sectional view of FIG. 1 is shown. Explanation of symbols: 1... Valve body, 3... Actuator, 10, 11, 12, 13, 14...
...Cylindrical sleeve, 15a, 15b, 15c, 15d
=Annular valve seat, 16.17... Exhaust side poppet valve element, 19.20... Supply side poppet valve element, 22
, 23... Valve body operating rod, 26... Spring, 27.28... Intermediate body, 31, 32...
... Zestone, 33, 34... Pilot valve.

Claims (1)

[Claims for Utility Model Registration] (a) A plurality of holes communicating with one of the five ports into the through hole 2 of the main body 1 having a supply passage, two consumer connection ports and two discharge ports. The cylindrical sleeves 10, 11, 12, 13.14 having holes formed therethrough are fitted between the respective cylindrical sleeves with annular valve seats 15a, t5b, 15c, 15d interposed therebetween; Inside the sleeve 13.14, a cylindrical part 16b, 17b abuts on one end with the annular valve seat 15a, 15d.
(c) An annular valve located within the cylindrical sleeve 10 and sandwiched between the cylindrical sleeves 11.12 located on both sides of the cylindrical sleeve 10. seat 1
an outer diameter portion 19a that contacts 5b and 15c to form a valve portion;
20a, and the opposite end outer diameter portions 19b and 20b, which have subsequently contracted in diameter and expanded, are the exhaust side poppet valve body 16.17.
a supply-side poppet valve body 19.20 configured to fit within the thin-walled cylindrical portions 16b, 17b of the supply-side poppet valve body 19.20; ) is fitted through the center portions of the exhaust poppet valve bodies 16, 17 and the supply poppet valve bodies 19, 20, and is fitted between the exhaust poppet valve body 16 and the supply poppet valve body 19 and between the exhaust side poppet valve bodies 16, 17 and the supply side poppet valve bodies 19, 20. 17 and supply side poppet valve body 20
An inner end surface is provided with through holes 22b and 23b, respectively, which form valve actuating collars 22a and 23a that protrude between them, and which communicate the inside 1f of the valve body with the back chambers Ig and lh along the longitudinal direction. Each valve body operation 22 that can come into contact with each other,
23, and (f) a piston 31 that presses the valve body operating rod 22.23.
(g) normally open type pilot valves 33, 34 for switching the fluid pressure that presses the pistons 31 and 32;
(force) Further, each annular valve seat 15 at 15 by
15 Inner diameter D1 of C915d and exhaust side poppet valve body 1
6.17 A poppet type three-position directional control valve in which the inner diameter D2 of each thin-walled cylindrical portion 16b, 17b and the outer diameter D3 of the supply side poppet valve bodies 19, 20 are configured to be approximately the same diameter.