JPH0368268B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a closed center five-port valve, and more particularly to a three-position five-port valve having a poppet valve.

Prior Art and Problems As a closed center type 5-port valve, as shown in Fig. 3, a 5-port valve has four individually movable poppet valves, or a 5-port valve that is a combination of four 2-port valves. Valves are known. In FIG. 3, 51 is the valve body, 52 is the first poppet valve, 5
3 is the second poppet valve, 54 is the third poppet valve, 5
5 is the fourth poppet valve, P is the supply port, and A is the first poppet valve.
Output port, B is the second output port, R ₁ is the first discharge port, R ₂ is the second discharge port, PP ₁ is the first pilot supply port, PP ₂ is the second pilot supply port, PL ₁ is the first pilot port, PL ₂ is the second
It is a pilot port.

In the conventional 5-port valve, two poppet valves 53,
54 are arranged in adjacent central valve chambers 56, 57, and two other poppet valves 52, 55 are arranged in outer valve chambers 58, 59. Valve chamber 56,5
7, 58, and 59 require a large space to movably accommodate the poppet valve, and flow path chambers 60, in which the output port A or B opens between the valve chambers 58 and 56 and between the valve chambers 57 and 59; 61 may be in a narrow space. Therefore, the center distances between adjacent ports of the five ports R ₁ , A, P, B, and R ₂ have different lengths.

Unlike poppet valves, in 5-port spool valves, as shown in Figure 4, there is not much difference in the size of the chambers that each port opens, and the center distance between each of the 5 ports is the same length. I can do it. Therefore, the sub-base on which the 5-port spool valve is mounted has flow passage ports that can be connected to each port at equal intervals.

While spool valves can have the same port spacing, poppet valves have variable port spacing. Therefore, a sub-base for the poppet valve is required separately from the sub-base for the spool valve.

Poppet valves, which have superior structural characteristics such as drainage resistance, dust resistance, and durability, and spool valves, which are easy to operate, may be used interchangeably depending on the usage conditions or type of fluid. In cases like this, conventionally it is necessary to replace everything including the sub-base. Therefore, there were problems in that replacement parts were costly and replacement required time and effort.

The object of the present invention is to solve this problem and provide a poppet valve that is compatible with spool valves.

Means for Solving the Problems The present invention solves the above-mentioned problems by solving the above-mentioned problems. 2
A valve body having a third valve chamber with a first discharge port opened therein and a fourth valve chamber with a second discharge port opened on the outside thereof, and a central fluid in each valve chamber. The two inner poppet valves each have a stem that passes through the outer poppet valve. It has an outer piston connected by two outer pistons.
Each of the two poppet valves has an inner piston slidably supported by a piston connected to a penetrating stem, and each of the two outer pistons is slidably supported in a cylinder chamber provided in the valve body. Supply ports of two pilot valves are connected to the fluid chamber, and the output ports of the pilot valves are connected to one of the cylinder chambers on the outside of the outer piston and the other of the cylinder chambers on the inside of the outer piston. In this case, for one of the cylinder chambers, the output port of one of the pilot valves is connected to the outside of the outer piston, and the output port of the other pilot valve is connected to the inside of the outer piston, and the cylinder chamber is connected to the outside of the outer piston. The problem was solved by a 5-port valve characterized in that an inner portion of the outer piston communicates with a space between the outer piston and the inner piston through a passage provided in the outer piston.

Effect According to the present invention, in the valve body, the first valve chamber and the second valve chamber, and further the third valve chamber and the fourth valve chamber are arranged on the left and right with the fluid chamber at the center, so that the valve body becomes bilaterally symmetrical. can be formed. Therefore, it becomes easy to select equal intervals between the ports. The plurality of poppet valves are arranged coaxially and are formed so as to be pressed toward the fluid chamber to close their respective valve seats, and two pilot valves are connected to the fluid chamber with supply ports and are supplied with fluid from the fluid chamber. valves are provided, the output ports of the pilot valve being connected to one cylinder chamber on the outside of the outer piston and the other cylinder chamber on the inside of the outer piston; The output port of one pilot valve is connected to the outside of the outer piston, and the output port of the other pilot valve is connected to the inside of the outer piston, and the part of the cylinder chamber inside the outer piston is connected to the outer piston and the inner piston through a passage provided in the outer piston. By communicating with the space between them, the fluid pressure by the pilot valve can be applied to the outer piston and the inner piston from the left and right sides, and the action by the pilot valve can also be performed with a substantially symmetrical configuration. . With this configuration, the structure of the valve body can be configured to have substantially the same port arrangement as that of the spool valve even in the poppet valve, and compatibility with the spool valve can be obtained.

Embodiments Details of the present invention will be explained based on embodiments shown in the drawings.

In FIG. 1, the valve body 1 has a supply port P, a first output port A, a second output port B, a first exhaust port R ₁ , and a second exhaust port R ₂ .

A first valve chamber 3, in which a first output port A opens, and a second valve chamber 4, in which a second output port B opens, are formed on the left and right sides of the figure, centering on the fluid chamber 2 in which the air supply port P opens, respectively. A third valve chamber 5, in which the first discharge port _R1 opens, is formed outside the first valve chamber 3 and adjacent to the left and right sides of the figure, and adjacent to the outside of the second valve chamber 4 and to the right side of the figure. A fourth valve chamber 6 is formed in which the second discharge port _R2 opens.

The first valve chamber 3 has a first poppet valve 7, the second valve chamber 4 has a second poppet valve 8, and the third valve chamber 5 has a third poppet valve.
A poppet valve 9 is disposed in the fourth valve chamber 6, and a fourth poppet valve 10 is disposed in the fourth valve chamber 6. Each poppet valve 7-10 is movably arranged on the same axis.

One of the inner poppet valves, the first poppet valve 7, is connected to the first outer piston 12 by a stem 11 which extends slidably through the third poppet valve 9. The first outer piston 12 is slidably guided in a first cylinder chamber 13 formed in the valve body 1 . The first cylinder chamber 13 can be formed integrally with the third valve chamber 5, but can also be separated by a partition wall if necessary. A first inner piston 14 is connected to the third poppet valve 9, which is one of the outer poppet valves, and the first inner piston 14 is slidably mounted inside the first outer piston 12.

One of the inner poppet valves, the second poppet valve 8, is connected to the second outer piston 16 by a stem 15 which extends slidably through the fourth poppet valve 10. The second outer piston 16 is slidably guided in a second cylinder chamber 17 formed in the valve body 1 . The second cylinder chamber 17 can be formed integrally with the fourth valve chamber 6 or separately.
A fourth poppet valve 10, which is one of the outer poppet valves.
is connected to a second inner piston 18 which is slidably guided within the second outer piston 16 .

The valve body 1 has a pilot supply port PP that opens into the fluid chamber 2, and a pilot supply port PP that opens into the first cylinder chamber 13.
A first opening on the outside of the outer piston 12
Pilot output port PA ₁ and second cylinder chamber 1
7, a second pilot output port PA ₂ that opens on the outside of the second outer piston 16; and a third pilot output port PB ₁ that opens on the inside of the first outer piston 12 in the first cylinder chamber 13;
A fourth pilot output port opens into the second cylinder chamber 17 on the inside of the second outer piston 16
PB ₂ is provided.

A through passage 19 is formed in each of the outer pistons 12 and 16, and a space 20 between the first outer piston 12 and the first inner piston 14 communicates with the third pilot output port _PB1 . A space 21 between the second inner piston 18 and the second inner piston 18 is configured to communicate with the fourth pilot output port _PB2 .

A seal portion 22 is formed in the first outer piston 12 to prevent the third pilot output port PB ₁ from communicating with the third valve chamber 5.
A seal portion 23 for preventing the fourth pilot output port PB ₂ from communicating with the fourth valve chamber 6 is formed in the fourth valve chamber 6 .

The pilot supply port PP is connected to a first pilot valve 25, for example a 3-port solenoid valve, by a flow path 24.
A second pilot valve 27, e.g.
The output port of the first pilot valve 25 is connected to the first pilot output port PA 1 through a passage 28 and to the fourth pilot output port PA ₁ through a passage 29.
Connected to output port PB ₂ , second pilot valve 2
The output port 7 is connected by a flow path 30 to the second pilot output port PA ₂ and by a flow path 31 to the third pilot output port PB ₁ .

The operation of this device will be explained.

Both pilot valves 25 and 27 are in a fluid supply state in the normal OFF state, and pilot fluid is supplied to all pilot output poppets PA ₁ , PA ₂ , PB ₁ , PB ₂ , and the pressure receiving area of each piston is connected to the corresponding poppet valve. Since each piston 12, 14, 16, 18 receives a pressing force from the pilot fluid pressure, each poppet valve 7,
8, 9, and 10 are pressed toward the central fluid chamber 2 to close between the valve chambers or between the valve chamber and the fluid chamber. That is, the first poppet valve 7 is seated on the valve seat 32 between the fluid chamber 2 and the first valve chamber 3, the second poppet valve 8 is seated on the valve seat 33 between the fluid chamber 2, and the third poppet valve 8 is seated on the valve seat 33 between the fluid chamber 2 and the first valve chamber 3. The valve 9 is seated on a valve seat 34 between the first valve chamber 3 and the third valve chamber 5, and the fourth poppet valve 10 is seated between the second valve chamber 4 and the fourth valve chamber 5.
Since it is seated on the valve seat 35 between the valve chamber 6, the output ports A and B and the discharge ports R and _R2 are both closed, forming a closed center type in a 5-port 3-position switching valve, and the switching Indicates center position.

When the first pilot valve 25 is turned on, the first pilot output port PA ₁ and the fourth pilot output port PB ₂ are in the discharge state, so the force acting on the first outer piston 12 is reduced, and the first poppet valve 7
The force acting on the valve moves the first poppet valve 7 and the first outer piston 12 to the left in the figure, causing the valve seat 32 to move to the left in the figure.
to open. At the same time, the force acting on the second inner piston 18 becomes lower, so that the fourth poppet valve 10 as well as the second inner piston 18 are moved to the right in the figure.
Open the valve seat 35. In this way, the liquid is supplied from the supply port P to the first output port A, and the second output port B communicates with the second discharge port _R2 to be in the discharge state. That is, it shows the 3rd position of the 3-position switching valve.

As shown in FIG. 2, the first pilot valve 25
When the second pilot valve 27 is turned OFF and turned ON, the second pilot output port PA ₂ and the third pilot output port PB ₁ enter the discharge state. Therefore, the second
The forces acting on the outer piston 16 and the first inner piston 14 are reduced, and the second poppet valve 8 is moved closer to the valve seat 33.
, and the third poppet valve 9 opens the valve seat 34. As a result, fluid is supplied from the supply port P to the second output port B, and the first output port A communicates with the first discharge port _R1 . That is, it shows the 3rd position of the 3-position switching valve. Here, the first pilot valve
ON, and when the second pilot valve 27 turns OFF, the first pilot output port PA ₁ and the fourth pilot output port PB ₂ are in the exhaust state, and the second pilot output port PA ₂ and the third pilot output port PB ₁ are in the supply state. , the first outer piston 12 is moved to the left side of the figure, the first inner piston 14 is moved to the right side of the figure in opposite directions, and similarly the second outer piston 16 is moved to the left side of the figure, and the second inner piston 14 is moved to the left side of the figure. Moved in opposite directions to the right in the figure, the open poppet valves 8, 9 are closed and the closed poppet valves 7, 10 are opened. At this time, due to the difference in area between the pistons 12 and 14, the first outer piston 12 takes time to exhaust air, and the first inner piston 14 moves immediately, so the third poppet valve closes and the first poppet valve opens. . Also, the area difference and the second outer piston 16 and the second
The movement of the second inner piston 18 is suppressed by the cushioning action of the fluid between it and the inner piston 18, and after the movement of the second outer piston 16 closes the second poppet valve, the second inner piston 18 moves and the second poppet valve is closed. The four-poppet valve 10 opens. Therefore, direct communication between supply port P and output ports A and B can be avoided.

Effects According to the present invention, the first valve chamber and the second valve chamber, as well as the third valve chamber and the fourth valve chamber, can be formed symmetrically around the fluid chamber, and the pistons that drive each poppet valve can all be formed symmetrically. , the supply port P, the output ports A and B, and the discharge ports R ₁ and R ₂ can be arranged outside the piston, and since the inner small piston is coaxially arranged inside the outer piston, the piston part can be Since the fluid passages at both ends of the valve can be concentrated in the center of the valve, it has become possible to concentrate the five ports in the center and arrange them at equal intervals _l1 and with the minimum pitch.

According to the present invention, the pilot valve applies fluid pressure to the left and right pistons in an almost symmetrical manner, so it is only necessary to control the two pilot valves alternately on and off, so the structure is almost symmetrical and simple, and the control is simple and easy. I got a good answer. As a result, a pilot type poppet valve with the same flow path arrangement as a pilot type spool valve can be formed, and the sub-base of the spool valve and poppet valve can be shared, and the spool valve and poppet valve can be adjusted according to the usage condition. exchange became possible. When used as a manifold type multiple valve, it has become easy to provide poppet valves only in frequently used parts.

According to the invention, when switching the pilot valve,
In the valve body, an outer piston and an inner piston that are slidably mounted to each other move in opposite directions, or one moves and the other remains stationary.
When one of the two poppet valves connected to the corresponding outer piston and inner piston is open, the outer piston and inner piston move in opposite directions, so the pressure receiving area difference between the outer piston and the inner piston and the Due to the cushioning action of the fluid between the pistons, the poppet valve that closes moves first, and the poppet valve that opens moves later. Therefore, direct communication between the output port and the exhaust port is prevented, and even though it is a poppet valve, it is possible to have an overlap seal function that prevents communication between the output port and the exhaust port, similar to a spool valve.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a 5-port poppet valve according to the present invention, FIG. 2 is a sectional view showing one switching state of the valve in FIG. 1, and FIG. 3 is a sectional view of a conventional closed center type 5
A sectional view of a port poppet valve. FIG. 4 is a sectional view of a conventional closed center type five-port spool valve. 1...Valve body, 2...Fluid chamber, 3, 4, 5, 6
... Valve chamber, 7, 8 ... Inner poppet valve, 9, 1
0...Outer poppet valve, 12,16...Outer piston, 14,18...Inner piston, 32,3
3, 34, 35... Valve seat, P... Supply port, A
...First output port, B...Second output port,
R ₁ ...First discharge port, _R2 ...Second discharge port,
PP……Pilot supply port, PA ₁ , PA ₂ ,
PB ₁ , PB ₂ ...Pilot output port.

Claims (1)

[Claims] 1 5 ports and 4 for switching between the ports
In a closed center type five-port valve having two individually movable poppet valves and a pilot valve that controls the poppet valves, the first output port opens to the left and right of the fluid chamber in which the supply port opens, respectively. A first valve chamber and a second valve chamber in which the second output port opens are formed, and a third valve chamber in which the first discharge port opens and a fourth valve chamber in which the second discharge port opens are formed on the outside thereof, respectively. one valve body and one valve seat each so as to seal the valve seat between the valve chambers or between the valve chamber and the fluid chamber by pressing the valve body toward the fluid chamber in the center of each valve chamber. movably coaxially disposed poppet valves, each of the two inner poppet valves having an outer piston connected by a stem passing through the outer poppet valve; an inner piston is slidably supported by the outer piston, the two outer pistons are each slidably guided in a cylinder chamber provided in the valve body, and two pilot valve supply ports are provided in the fluid chamber. connected,
The output port of the pilot valve is connected to one of the cylinder chambers on the outside of the outer piston, and the other cylinder chamber is connected on the inside of the outer piston, with one of the pilot valves being connected to one of the cylinder chambers on the inside of the outer piston. The output port of the valve is connected to the outside of the outer piston, and the output port of the other pilot valve is connected to the inside of the outer piston, and the cylinder chamber is connected to a through passage provided in the outer piston. A closed center type five-port valve, characterized in that the valve communicates with a space between the outer piston and the inner piston through the valve.