JPH0426888Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-pressure output valve that outputs two high and low fluid pressures from one valve.

[Prior Art] In a fluid pressure actuator, it may be necessary to change the fluid pressure supplied to a pressure chamber depending on the magnitude of the load.

Conventionally, when switching fluid pressure between high pressure and low pressure,
As shown in Fig. 7, pressure reducing valves 4 and 5 with different set pressures are connected to the input ports 2 and 3 of the 3-port valve 1 through piping, and the output port 6 is switched to the input port 2 or 3 for communication. This outputs high-pressure or low-pressure pressure fluid, and this pressure fluid is supplied to and discharged from the pressure chamber of the fluid pressure cylinder 8 by the 5-port valve 7.

However, the two-pressure output mechanism has problems in that the three valves 1, 4, and 5 are connected by piping, which requires a large installation space and requires troublesome piping.

Another problem is that because the pressure fluid flows through two valves connected in series, resistance increases and losses increase.

On the other hand, a pressure regulating chamber between the freely displaceable pressure regulating member and the displacement member, a feedback chamber for output pressure on the displacing member side, and a pressure setting spring contracted in the pressure regulating chamber; A governor (two-port valve) having high pressure and low pressure setting members for regulating the sliding position of a pressure regulating member provided on a rotatable operation plate has been proposed, for example, in Japanese Utility Model Application No. 49-61146. .

However, since this valve is a two-port valve and does not have a discharge port, it is possible to increase the fluid pressure set at low pressure to high pressure, but unless the fluid pressure at the output port is lowered by other means, the high pressure There is a problem in that it is not possible to reduce the fluid pressure set to a low pressure. Furthermore, since the switching between low pressure and high pressure is performed by rotating the operation plate, the operation is troublesome and time-consuming.

[Problem to be Solved by the Invention] The problem to be solved by the invention is to provide a two-pressure output valve that can switch between high pressure and low pressure and can quickly switch.

[Means for Solving the Problems] In order to solve the above problems, the two-pressure output valve of the present invention has a supply valve seat provided in a passage that switches a pressure fluid output port between a supply port and a discharge port for communication. and a discharge valve seat, a supply valve body and a discharge valve body that open and close these valve seats, and an output section that sets the fluid pressure of the output port, and the fluid pressure of the feedback chamber to which the fluid of the output port is fed back. In the valve that opens and closes the valve seat by driving these valve bodies depending on the magnitude of the acting force of and the output from the output section, the output section is slidably provided within the main body of the output section. a pressure regulating member that outputs a force opposing the acting force of the feedback fluid pressure; a pressure regulating chamber on the feedback chamber side partitioned by the pressure regulating member;
A pressure setting chamber on the opposite side, a pressure setting spring contracted in the pressure regulating chamber, and high pressure and low pressure setting members provided in the main body so as to be movable in the axial direction and regulating the sliding end positions of the pressure regulating member. and a supply/discharge valve for supplying and discharging pressure fluid to and from the pressure setting chamber to move the pressure regulating member in a direction in which it comes into contact with the high pressure setting member and the low pressure setting member.

[Function] When pressure fluid is not supplied to the pressure setting chamber, the pressure regulating member comes into contact with the low pressure setting member due to the biasing force of the pressure setting spring, and the supply valve body opens the supply valve seat due to the output from the output section. The primary fluid in the supply port then flows out to the output port, and the fluid pressure on the output side is fed back to the feedback chamber.

When the biasing force of the pressure setting spring and the acting force of the output pressure of the feedback chamber become equal, the output from the output section stops, the supply valve body and the discharge valve body close the supply valve seat and the discharge valve seat, and the output port The fluid pressure is set to a low pressure according to the small biasing force of the pressure setting spring determined by the contact position of the pressure regulating member to the low pressure setting member.

When pressure fluid is supplied to the pressure setting chamber by the supply/discharge valve, the pressure regulating member compresses the pressure setting spring and comes into contact with the high pressure setting member, and the supply valve element opens the supply valve seat due to the output from the output section, and the low pressure By the same operation as in the above case, the fluid pressure of the output port is set to a high pressure corresponding to the large biasing force of the pressure setting spring determined by the contact position of the pressure regulating member to the high pressure setting member.

When the pressure fluid in the pressure setting chamber is discharged by the supply/discharge valve when the fluid pressure of the output port is set to high pressure, the pressure regulating member comes into contact with the low pressure setting member due to the biasing force of the pressure setting spring, causing the spring to close. The force decreases, and the discharge valve body opens the discharge valve seat due to the action of the fluid pressure in the feedback chamber, and the output pressure at the output port decreases. When the pressure at the output port decreases and its acting force becomes equal to the biasing force of the decreased pressure setting spring, the discharge of fluid from the discharge valve seat stops and
The fluid pressure at the output port is reset to a low pressure according to the small biasing force of the pressure setting spring.

Therefore, by supplying and discharging pressure fluid to the pressure setting chamber, two high and low fluid pressures can be output from one valve, and these fluid pressures can be adjusted by adjusting the positions of the high and low pressure setting members. By adjusting the biasing force of the pressure setting spring, the desired pressure can be set.

This dual-pressure output valve can output two high and low fluid pressures from one valve, so there is no need for piping, which reduces the installation space and is easy to install. Because it passes through
The loss can be reduced.

Furthermore, not only can switching between high pressure and low pressure be possible, but also switching can be done using a supply/discharge valve, so switching is quick and easy.

[Embodiment] FIGS. 1 and 2 show a first embodiment of the present invention in which a two-pressure output valve is a direct-acting type, and the valve body 1 of the main valve 10 is
1 is provided with a pressure fluid supply port P, an output port A, and a mounting hole for a retainer 12, and a supply valve seat 13 is formed in a passage that communicates the ports P and A, and a supply valve seat 13 is opened and closed. The valve body 14 airtightly slides on the discharge port R opened in the retainer 12 screwed into the mounting hole, and is closed to the valve seat 1 by a return spring 15.
3 is biased in the direction of closing.

A periphery of a diaphragm 18, which also serves as a displacement member and an output section, is fixed between the valve body 11 and a pressure regulating chamber body 17 attached to the valve body by appropriate means, and is partitioned by the diaphragm 18. The feedback chamber 19 communicates with the output port A through a feedback passage 20 formed in the valve body 11.

The supply valve body 14 is formed with a discharge valve seat 21 that communicates ports A and R, and the discharge valve body 22 that opens and closes the valve seat 21 has a shell screwed onto the tip extending into the feedback chamber 19. 23 etc., and the supply valve body 14 and the discharge valve body 22 are fixed to the supply valve seat 13 and the discharge valve seat when the diaphragm 18 is in the neutral position shown. 21.

The pressure regulating chamber main body 17 has a pressure regulating member 2 sliding therein.
5 into a pressure regulating chamber 26 on the diaphragm side and a pressure setting chamber 27 on the opposite side, and the pressure regulating member 2
A pressure setting spring 28 is compressed between the pressure regulating chamber 5 and the diaphragm, and the pressure regulating chamber 26 communicates with the outside through a port 29. A narrow cover 31 is attached to the upper part of the pressure regulating chamber main body 17.
The low pressure setting member 32 screwed into the enlarged diameter hole in the pressure regulating chamber 17 airtightly penetrates the upper wall of the pressure regulating chamber main body 17 and protrudes into the pressure setting chamber 27. Pressure setting chamber 2 by rotation
The protruding position into the cover 7 can be adjusted, and the position is fixed by a set screw 34 screwed into the cover 31 (see FIG. 2).

Further, the high pressure setting member 35 screwed onto the upper wall of the cover 31 passes through the low pressure setting member 32 and the pressure regulating member 25 in an airtight manner and protrudes into the pressure regulating chamber 26, and the pressure regulating member 25 engages with the tip thereof. It has an engaging part 36, and when the handle 37 outside the cover 31 is rotated, the pressure regulating chamber 26 is closed.
The inward protrusion position is adjustable, and the position is fixed by a nut 38.

In the electromagnetic valve 40 attached to the pressure regulating chamber main body 17, the input port 41 and the output port 42 are communicated with each other by energizing the solenoid, and the discharge hole 43 is closed, and the output port 42 and the discharge port 43 are communicated with each other by de-energizing the solenoid. This is a well-known three-port solenoid valve whose input port 41 is closed when the input port 41 is closed.
They are connected to each other.

Reference numeral 45 in FIG. 2 is a pressure gauge that displays the fluid pressure of the output port A.

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

FIG. 1 shows a state in which the output pressure is set to a low pressure.

Before setting the low pressure, the pressure setting chamber 27 is connected to the output port 42 of the solenoid valve 40, the discharge port 43, and the pressure regulating chamber 2.
6, the pressure adjusting member 25 contacts the low pressure setting member 32 due to the biasing force of the pressure setting spring 28, and the diaphragm 18 is displaced downward in the figure, so that the supply valve body 14 becomes the supply valve. The seat 13 is released and the discharge valve body 22 closes the discharge valve seat 21.

When pressure fluid is supplied to the supply port P, this pressure fluid flows out to the output port A through the supply valve seat 13 and flows into the feedback chamber 19 through the feedback passage 20, and the fluid pressure in the feedback chamber 19 increases. When the acting force becomes equal to the small biasing force of the pressure setting spring 28, the diaphragm 18 stops at the neutral position and the valve body 14,
22 closes the valve seats 13, 21 and a low output pressure is set.

In this case, by rotating the handle 33, the low pressure setting member 32 is advanced or retreated to adjust the stopping position of the pressure regulating member 25, thereby adjusting the biasing force of the pressure setting spring 28, and adjusting the output pressure of the low pressure to the desired fluid. The low pressure setting member 32 is fixed by a set screw 34.

When the solenoid of the electromagnetic valve 40 is energized and pressure fluid from the supply port P is supplied to the pressure chamber 27 through the input port 41 and the output port 42, the pressure regulating member 25 compresses the pressure setting spring 28 and the high pressure setting member 35 , the biasing force of the pressure setting spring 28 increases and the supply valve element 14 opens the supply valve seat 13, and a high fluid pressure is set in the same manner as the low pressure setting.

Even when setting a high pressure, the high pressure output pressure can be set to a desired fluid pressure by moving the high pressure setting member 35 forward and backward by rotating the handle 37 and adjusting the biasing force of the pressure setting spring 28. 38 fixes the high pressure setting member 35. In this case, since the low pressure setting member 32 is fixed by the set screw 34, the low pressure setting does not change even if the high pressure setting member 35 is moved back and forth.

When the fluid pressure in the pressure setting chamber 27 is discharged, the pressure regulating member 25 comes into contact with the low pressure setting member 32 due to the biasing force of the pressure setting spring 28, and the biasing force of the spring 28 becomes smaller, and the diaphragm 18 moves into the feedback chamber 1.
As the discharge valve body 22 moves upward in the figure to open the discharge valve seat 21 due to the acting force of the fluid pressure at 9, the pressure fluid in the output port A flows out from the discharge port R, and the fluid pressure in the output port A is reduced. drops to the set low pressure.

Therefore, when the solenoid of the solenoid valve 40 is energized, the fluid pressure at the output port A becomes the high set pressure, and when the solenoid is de-energized, the fluid pressure becomes the low set pressure. From high to low 2
It is possible to output two fluid pressures.

FIGS. 3 and 4 show a second embodiment of the present invention in which a two-pressure output valve is pilot-driven. It is placed on 54.

The valve body 56 of the main valve 51 includes a supply passage 57 and an output passage 58 of the manifold block 54.
and a supply port P, an output port A, and a discharge port R each communicating with the discharge passage 59, and a supply valve seat 60 and a discharge valve seat 61 formed opposite to a through hole that communicates these ports, The supply valve body 62 and the discharge valve body 63 that open and close the valve seats 60 and 61 are provided with end plates 64a and 6 that close both ends of the through hole.
4b, and is urged by return springs 65, 65 in a direction to close the valve seats 60, 61.

The valve rod 66 that drives the valve bodies 62 and 63 is connected to the end plate 6
A driving piston 67 is fixed to the tip that protrudes into the spacer through airtightly penetrating the spacer 4b, and divides the inside of the spacer into a head chamber 68 and a rod chamber 69. It communicates with the output port A through a passage 70 and a gap between the discharge valve body 63 and the valve stem 66, and the valve body 62,
63 is associated to close the valve seats 60, 61 when the drive piston 67 is in the neutral position shown.

The pressure regulation chamber main body 17 in the output section 52 includes a piston 72 as a displacement member that partitions the feedback chamber 19, and a discharge port RP opened in the piston 72 communicates with the outside through the pressure regulation chamber 26 and the port 29. However, a feedback passage 20 is formed around the supply valve body 22.

The low pressure setting member 32 has a cup-shaped handle 73 screwed onto the outer periphery of the pressure regulating chamber main body 17, and the handle 73 has a circumferential groove 75 on the upper outer periphery, a radial locking groove 76 on the top wall, ... are formed respectively (see FIG. 4), and their positions are fixed by nuts 74.

The handle 78 of the high pressure setting member 35 has a center
A locking piece 80 that engages with the flat part at the tip of the high-pressure setting member and locks an engagement hole 79 that can move forward and backward with respect to the high-pressure setting member 35 and rotates together with the peripheral groove 75 at the lower end of the peripheral wall. A radial locking piece 8 is attached to the inner surface of the upper wall.
1, ..., respectively, and the locking piece 80 is in the circumferential groove 75.
In the state shown in FIG. 3 in which the handle 78 is locked to the handle 73, the lock grooves 76, . . . and the lock pieces 81, . When the circumferential groove 75 is released, the lock grooves 76, . . . and the lock pieces 81, .
(See Figure 4).

Therefore, by releasing the lock and rotating the handle 78, the high pressure setting member 35 can be moved forward or backward, and when the handle 78 is pressed, the high pressure setting member 35 is locked.

The other configuration and operation of the output section 52 in the second embodiment are the same as in the first embodiment except that high pressure or low pressure pilot fluid is output from the output port AP to the head chamber 68. The same reference numerals are given to the main parts, and detailed explanations are omitted.

In the main valve 51, when the driving piston 67 is driven by high pressure or low pressure pilot fluid supplied to the head chamber 68, the supply valve body 62 is moved to the supply valve seat 6.
0 is opened, the primary fluid in the supply port P flows out to the output port A, and the feedback passage 7
0 into the rod chamber 69, and enters the chambers 68, 69.
The acting forces of the fluid pressures become equal and the driving piston 6
7 stops at the neutral position, the valve seats 60 and 61 are closed, and the fluid pressure at the output port A is set to a high or low pressure depending on the high or low pilot fluid pressure.

A third embodiment of the present invention is shown in FIGS. 5 and 6, and this two-pressure output valve includes a main valve 51, an output section 52, and first and second electromagnetic valves 53 and 87.
The configuration of the main valve 51, the output section 52, and the solenoid valve 53 and the flow paths between them are the same as in the second embodiment except for the feedback passage of the main valve, which will be described later, so please refer to FIG. 3 for details. Explanation will be omitted.

As shown in FIG. 6, the second solenoid valve 87 communicates with an input port 88 that communicates with the supply port P of the main valve 51, an output port 89 that communicates with the rod chamber 69, and an output port A of the main valve. It has a discharge port 90, and when the solenoid is energized, the input port 88 and the output port 89 communicate with each other, and the discharge port 90 is closed, and when the solenoid is de-energized, the output port 89 and the discharge port 90 communicate with each other, and the input port 88 is closed. This is a well-known 3-port solenoid valve. In this case, since the rod chamber 69 communicates with the output port A via the output port 89 and the discharge port 90, the feedback passage 71 is not formed in the main valve 51.

In the operation of the third embodiment, when the solenoid of the second solenoid valve 87 is de-energized, the fluid pressure of the output port A flows into the rod chamber 69 through the discharge port 90 and the output port 89 of the solenoid valve 87. It is the same as the second embodiment except for the feedback, and the output port A of the main valve 51 is activated or de-energized by the solenoid of the solenoid valve 53.
Two high and low fluid pressures are output.

When the solenoid of the solenoid valve 53 is de-energized and the solenoid of the solenoid valve 87 is energized, the solenoid of the solenoid valve 87
The input port 88 and the output port 89 communicate with each other to form a discharge port 90.
is closed, primary fluid is supplied from the supply port P to the rod chamber 69, and low pressure fluid is supplied to the rod chamber 68 by de-energizing the solenoid of the solenoid valve 53, so that the drive piston 67 is In the figure, the discharge valve body 63 opens the discharge valve seat 61 by moving to the left, and the pressure fluid of the output port A is transferred to the discharge port R.
is discharged from.

[Effect of the invention] The two-pressure output valve of the invention changes the biasing force of the pressure setting spring by sliding the pressure regulating member when the pressure fluid is supplied and discharged from the pressure setting chamber by the supply and discharge valve. Since two high and low fluid pressures are output from the valve, the installation space is reduced, and not only the trouble of piping can be omitted, but also the loss can be reduced.

Further, since the two high and low pressure setting members that regulate the sliding position of the pressure regulating member are adjustable in position, the two high and low set pressures can be set to a desired fluid pressure.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part of the first embodiment of the present invention, Fig. 2 is a plan view of the upper half of the same, Fig. 3 is a longitudinal sectional front view of the main part of the second embodiment of the invention, and Fig. 4 is a longitudinal sectional front view of the main part of the first embodiment of the invention. 5 is a side view of the third embodiment of the present invention, FIG. 6 is a longitudinal sectional front view of the main part of the same, and FIG. 7 is a schematic configuration diagram of a conventional two-pressure output valve. It is. 10, 51... Main valve, 13, 60... Supply valve seat, 14, 62... Supply valve body, 18... Diaphragm, 19... Feedback chamber, 21, 61...
...Discharge valve seat, 22, 63...Discharge valve body, 25...
Pressure regulating member, 26... Pressure regulating chamber, 27... Pressure setting chamber, 28... Pressure setting spring, 32... Low pressure setting member, 35... High pressure setting member, 40, 53, 87...
... Solenoid valve, 52 ... Output section, 72 ... Piston,
P... Supply port, A... Output port, R... Discharge port.

Claims (1)

[Scope of Claim for Utility Model Registration] A supply valve seat and a discharge valve seat provided in a passage that switches a pressure fluid output port into a supply port and a discharge port for communication, a supply valve body that opens and closes these valve seats, and It is equipped with a discharge valve body and an output part that sets the fluid pressure of the output port, and depending on the magnitude of the acting force of the fluid pressure of the feedback chamber to which the fluid of the output port is fed back and the output from the output part, In a valve that opens and closes a valve seat by driving these valve bodies, the output section is slidably provided in the main body of the output section and outputs a force that counteracts the acting force of the feedback fluid pressure. A member, a pressure regulating chamber on the feedback chamber side partitioned by the pressure regulating member, a pressure setting chamber on the opposite side, a pressure setting spring contracted in the pressure regulating chamber, and a pressure regulating chamber that can move forward and backward in the axial direction of the main body. A high pressure setting member and a low pressure setting member are provided to regulate the sliding end positions of the pressure regulating member, and a direction in which pressure fluid is supplied to and discharged from the pressure setting chamber to bring the pressure regulating member into contact with the high pressure setting member and the low pressure setting member. A two-pressure output valve characterized by comprising: a supply/discharge valve that moves the valve to the valve;