JPS60201179A - Current-control type flow regulating valve - Google Patents

Abstract

PURPOSE:To unload a fluid pressure pump without a solenoid switch valve by providing a pressure compensation valve and a select valve for regulating the connection among a current-control type pressure control valve, a throttle valve, a return path and an inflow path. CONSTITUTION:When a solenoid 84 is not excited, pilot pressure does not work upon a current-control type pressure control valve 10, so that a throttle valve body 60 intercepts the connection between an IN port and an OUT port. Accordingly, as the fluid pressure in a pilot fluid chamber 150 of a select valve 12 is lowered, the fluid pressure in the other end valve chest 19 of a pressure compensation valve 6 comes to near zero, and a pressure compensation valve 18 is urged to the left by a spring 28, so that an inflow path 21 is unloaded to a return path 23. When an electric current is applied to the solenoid 84, the flow rate is adjusted according to the current value.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a current-controlled flow m regulating valve, and particularly to a current-controlled flow m regulating valve that can unload a pressure fluid inflow path when the supplied current value becomes below a certain value. Regarding regulating valves.

[Prior Art] Conventionally, in fluid devices, in order to prevent the temperature of the working fluid from rising and to reduce the pump power, for example, as shown in FIG. ] - It is customary to remove the boat via the electromagnetic switching valve 2 and unload the hydraulic pump 3. However, with this type of device, an extra electromagnetic switching valve is required, the installation space increases, the number of piping increases, etc.; It requires a signal, so the electric v4 control device connection is Jl! [Purpose of the Invention] The present invention was made as a blue stone under these circumstances, and the purpose of the present invention is to An object of the present invention is to provide a current-controlled flow rate regulating valve that can unload a fluid pressure pump without requiring an electromagnetic 9J valve or the like.

[Invention 4] This J: The gist of the present invention, which has been made to achieve the above object, is as follows: The communication between the II type pressure control valve and the inlet and outlet channels is established by moving the throttle valve body against the biasing force of the spring according to the set pressure of the pilot fluid.
The fluid pressure in the valve chamber at one end, the fluid pressure in the valve chamber at the other end, and the opposing action horn of the spring (= J force) are adjusted, and the pressure horn m is displaced by J-. a pressure compensating valve that adjusts communication between a return path communicating with the storage tank and an inflow path;
When adjusting the set pressure of the pilot fluid using the current-controlled pressure control valve, the -C selection valve body is moved by the pilot fluid against the biasing force of the spring, and the throttle valve throttles and communicates between the inflow path and the outflow path. The valve chamber at the other end of the pressure compensation valve is communicated with the outflow passage so as to compensate for a constant pressure before and after the throttle valve, and the throttle valve shuts off the gap between the inflow passage and the outflow passage [Pilot by E-controlled pressure control valve] When adjusting the set pressure of the fluid, the fluid in the inflow path is returned to the storage tank with almost no pressure, and the pressure compensating valve is provided with a selection valve that communicates the valve chamber at the other end with the storage tank.

[Example 1] An example of the present invention will be described below in detail based on the drawings.

As shown in Fig. 2, the current control type warm adjustment J? 'teeth,
Pressure compensation valve 6, throttle valve 8, Ti flow sub-control type pressure control valve 1
0 selection valve 12, pressure reducing valve 14, etc.
It is integrally attached by kj and is made up of 4f4.

The pressure compensation valve 6 has a pressure compensation valve body 18 slidably fitted into a fitting hole formed in the valve body 16, and the pressure compensation valve body 18
A valve chamber 17 at one end and a valve chamber 19 at the other end are formed on both ends of the fitting hole, and an annular groove formed in the inner periphery of the fitting hole is surrounded by the outer periphery of the pressure compensating valve body 18. Ring-shaped sky20.
22 are configured. The chamber 120 is connected to the IN boat through the inflow path 21 and is capable of supplying pressure horn fluid, and the chamber 22 is connected to the R boat through the return path 23 and has a storage tank (for storing working fluid). (not shown). Generally speaking, the chamber 20 is connected to an inlet 26 of the throttle valve 8 by an inlet 24 . A compression coil spring 28 is provided in the valve chamber 19 at the other end, and the chamber 2Q is communicated with the valve ff17 at one end through a small hole 3Q that overlaps the pressure compensating valve body 18 in stages. As a result, the pressure compensating valve body 18 is moved to the right in FIG. The pressure compensating valve element is displaced in response to a counteracting force with respect to the force in the direction, thereby establishing communication between the valve passage 23 communicating with the storage tank and the inflow passage 21. That is, the pressure compensating valve body, 18 slides left and right according to the differential pressure between the downstream side and the downstream side of the throttle, so that the differential pressure before and after the throttle can always be compensated at a constant level. A flow path 32 communicating with the OUT port 1- is connected to an outflow path 34 of the comparison valve 8.

Further, on the UtD end side of the fitting hole of the valve body 16, a relief valve body 36, a mounting member 38, and a valve body 40 are provided.
．． A relief valve consisting of a compression coil spring 42 and a relief pressure adjusting screw is removed so that the fluid pressure in the valve chamber 19 at the other end can be controlled in relief. The fluid that has passed between the relief valve body 36 and the seat portion flows through the flow path 48 to the R boat side.
It is like that. The other end of the valve chamber 19 is connected to the VE boat of the selection valve 12 through a flow path 52 having a fixed throttle 50 and through a flow path 53 in the throttle valve 8 . A flow path 54 branched from a flow path communicating with the IN boat of the pressure compensation valve 6 is
It is connected to the flow path 56 of the pressure reducing valve 14 through a flow path (not shown) provided in the throttle valve 8 and the selection valve 12 .

In the throttle valve 8, the throttle valve body 60 is inserted into the fitting hole formed in the valve body 58. The two chambers are movably connected to one another and surrounded by the annular groove on the inner periphery of the fitting hole and the outer periphery of the throttle valve body 60.
An inflow path 26 and an outflow path 34 are connected to each other. A notch 62 is provided in the land portion of the throttle valve body 600, and by sliding the throttle valve body 60, communication between the inlet passage 26 and the outlet passage 34 can be established at m1 nodes. A compression coil spring 66 is attached via a spring receiver 65 in a pilot fluid chamber 64 formed by sealing the large-diameter side front end of the fitting hole with a lid member 63. The throttle valve body 6 is moved in the direction of blocking the communication between the passages 34.
0 is always pressed. The pilot fluid chamber 64 is connected to the pilot flow path 69 in the selection valve 12 by a pilot flow path 68 and to the OR in the force compensation valve G via a flow path 72 having a constriction restriction 70. The OR boat is connected to a flow path 74 that communicates with the boat.The OR boat can communicate with the storage tank.In addition, the outflow 1134 is communicated with the flow path 76 through an annular chamber, and is further connected to the inside of the selection valve 12. The opening I on the other end side of the fitting hole]
The end is 'rJi! A pilot fluid chamber 81 surrounded by the I material 80 is connected to a pilot flow path 83 of the selection valve 12 via a pilot flow path 82 .

The current &lj type pressure control valve has a solenoid 84 on a lid member 80 attached to the side of the valve body 58.
A yoke 86 is fixed thereto, a mounting member 88 is disposed at one end of the inner hole of the yoke 8G, and a guide member into which a movable plansite 90 is slidably fitted is provided at the other end of the inner hole. 92 are arranged. The movable plunger 90 is provided with a poppet valve body part 93 at the tip M4, and can be seated in a part of the seat 1 formed at the open end of the right hole part U98 which is fixed to the lid part 4480. The pressing force of the poppet valve body part 93 against the seat part can be adjusted according to the current value supplied from the current 0101 part 94 to the solenoid 84. The pilot fluid pressure in the pilot fluid chamber 81 is applied to the poppet valve body 93 through the flow path in the perforated member 98, but the force pushing the poppet valve body 93 is caused by the solenoid 8.
The current value is changed to 1!7 according to the current value of 4, so the current value is 1Jl151! ! By spelling it out as possible,
The set pressure of the pilot fluid J>k in the pilot fluid chamber 81 is adjusted. 9G is a stopper device that covers i11!1 the retracted position of the movable plan seat 90 when the solenoid is not energized.

The throttle valve body 60 is compressed and moved to the left by the fluid pressure against the piston 66, and the inflow passage 26
The frontage of the notch 62 that communicates between the outflow path 34 is controlled in accordance with the set pressure, and the throttle communication between the inflow path 26 and the outflow path 34 is adjusted.

Note that when no current is supplied to the solenoid 84, the poppet valve body portion 93 is pushed back by the pilot fluid, and the pi[1]t fluid L[in the pilot fluid chamber 81 decreases. The liquid that has passed between the valve body part 93 and the seam part 1 passes through the flow path 100 to the pressure compensating valve 6.
The water passes through the flow path 74 and is led out to the OR boat.

In the selection valve 12, when both ends of the fitting hole penetrating the valve body 102 are sealed by one member 103 and 104, the selection valve body 106 having the through hole 105 in the fitting hole becomes slidable. It is fitted. A compression coil spring 110 is provided in the fluid chamber 108 formed at one end of the selection valve body 106 .
is always biased to the right. When the fluid set pressure in the pilot fluid chamber 81 is adjusted by the current 11211 type pressure control valve 10 so that the throttle valve 8 is cut off, the pressure in the pilot fluid chamber 81 is adjusted. ? Therefore, the pilot pressure in the pilot fluid chamber 1 trillion connected to the pilot fluid chamber 81 is also not J-r+L.

Therefore, as shown in FIG. The chamber 116 is connected to the conduction hole 105 by J. Therefore, the other end valve chamber 19 is communicated with the D1 valve 1~, and the fluid in the inflow passage 21.24 is returned to the storage tank with almost no pressure.

On the other hand, when the pilot pressure in the pyrower 1 and the fluid chamber 81 is set by the current-controlled pressure control valve 10 so that the throttle valve 8 throttles and communicates between the inflow path 26 and the outflow path 34, the pilot pressure is in the upper limit state, the pressure of the pylon 1 of the pilot fluid chamber 150 is also upper limit, the selection valve body 106 moves to the left against the biasing force of the spring 110, and the chamber 116 and the chamber 120 are separated. communication, resulting in an outflow channel 34
Pressure fluid is introduced into the other end valve chamber 19 of the pressure compensating valve 6, and the differential pressure across the throttle valve 8 is compensated to be constant as described above.

In the pressure reducing valve 14, the opening of the fitting hole provided in the valve body 122 is sealed by the lid part 124, and the fitting hole has a notched hole 12 in a bottomed circular hole part 134 formed at one end.
A pressure reducing valve body 130 having a diameter of 6.128 is slidably fitted. The pressure reducing valve body 130 is always biased toward the other end by a compression coil spring 132. IN
The flow path 56 communicating with the boat is connected to the chamber 136, and further connected to the chamber 138 through the notched hole 128, the bottomed circular hole 134, and the notched hole 126, and the chamber 138 has a fixed throttle 1'40 on both sides. .142 is connected to a branch channel 144 to the right, and both ends of the channel 144 are connected to a channel 146.
148 to the pilot fluid chamber 108 of the selection valve 12
．． 150. Depending on the secondary pressure, the pressure reducing valve body 130 moves to a position corresponding to the (=I force) of the spring 132, sequentially closes the notch hole 128 with the fitting hole circumferential wall, and adjusts the opening amount to control the branch flow. The pressure on the passage 144 side is reduced to a constant pressure.

FIG. 3 is a hydraulic circuit diagram showing the above embodiment using JI8 symbols. '158 is a relief valve provided within the valve body 16 of the pressure saw compensation valve 6.

The operation of the above embodiment will be explained below. solenoid 8
4 is de-energized, the force that moves the movable plunger 90 to the left is not moving, so the pilot pressure in the pyrower 1-fluid chamber 81 decreases and the throttle valve body 60 is in the position shown in FIG. , IN boat OU] and boat 1 are connected "" Ifll17i.

When the pilot pressure in the pyrofluid-fluid space 81 decreases, the fluid pressure in the pilot fluid chamber 150 of the selection valve 12 also decreases, so the selection valve body 106 is in the position shown in FIG.
The other end valve chamber 19 of the +li implant valve 6 is communicated with the DR bow 1. Therefore, the fluid pressure in the other end valve chamber 19 becomes close to zero,
The pressure compensation valve body 18 receives the spring 28 on the left side, and when the differential pressure before and after the throttle is set to 3 kgr/CI, the inflow path 21 becomes the return path with a fluid pressure of 3 kgf/α formula. 23 hair is unloaded.

When a current is supplied to the solenoid 84, the valve part 1 to the valve body part 93 of the movable blank 90 are pressed with a pressing force corresponding to the current value, and the pilot valve in the pilot fluid chamber 81 is pressed. The pressure increases to a predetermined set pressure. Aperture jc (4 + 60 moves to the left corresponding to the set pressure or current (ifj, and I
To the N boat 1, the flow path between the OUT boat [2 1ff]
i is determined. When the fluid pressure in the fluid chamber 81 increases, the fluid pressure in the fluid chamber 150 of the selection valve 12 increases, and the selection valve body 106
is moved to the left and flows into the other end of the pressure compensation valve 6 into the valve chamber 19! Fluid pressure within fi 34 is applied. Therefore, the pressure compensating valve body 18 receives the fluid pressure in the other end valve chamber 19 and the biasing force of the spring 28, so that a constant pressure difference is maintained between the IN boat and the OUT boat. As a result, the throttle opening between the flow paths 26 and 34 is controlled in accordance with the current flow of the solenoid 84.
The flow rate will be adjusted according to the current value.

As described above, according to this embodiment, the inflow path can be unloaded by turning off the excitation current of the solenoid 84, so there is no need for a separate electromagnetic switching valve (61) as in the conventional example, and therefore the installation space is reduced. This reduces the hassle of piping installation, eliminates the need for control signals for electromagnetic switching valves, simplifies electrical control equipment, and helps reduce production costs.

Furthermore, when operating nine cylinders in sequence as shown in FIG. 4, it is possible to always compensate for the differential pressure before and after the throttle of the flow regulating valve 11 even if the load changes. 1' 6
0 indicates the electrically controlled J-type flowing mountain control valve of the above embodiment. Furthermore, when unloading, fluid resistance can be reduced, which helps save pump time.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment in any way, and may be implemented in various forms without departing from the gist of the present invention. ? Of course.

[Effects of the Invention] 1. According to the present invention, by adjusting the excitation current supplied to the solenoid of the current-controlled pressure 1-control valve, the inflow path of the pressure fluid is cut off, and
Since the inflow path can be unloaded, there is no need for a separate electromagnetic switching valve or the like in the conventional example, and the inflow path can be unloaded. Ru. As a result of 2, it is possible to reduce the amount of space required, eliminate the trouble of installing extra piping, and reduce costs. Eliminates unnecessary noise and simplifies electrical control equipment! 10.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram of a conventional example of an unload circuit in the non-negative direction. Fig. 2 is a sectional view showing one embodiment of the present invention, Fig. 3 is a hydraulic circuit diagram showing the same implementation (fluid f [circuit]), and Fig. 4 is a hydraulic circuit diagram of a hydraulic circuit to which the same embodiment is applied. Yes. 6... Pressure compensation valve 8... Throttle valve 10... Current controlled pressure control valve 12... Selection valve 14... Pressure reducing valve 16.58.102... Valve body 66.110 ... Compression coil spring 90 ... Movable plan seat 106 ... Selected valve body agent Patent attorney Tsutomu Adachi fa h'

Claims (1)

[Claims] A current-controlled pressure control valve that can adjust the set pressure of pilot fluid according to the supply current (IC1) of a solenoid, and a throttle valve that resists the biasing force of a spring according to the set pressure of the pilot fluid. A throttle valve whose body can be moved to adjust the communication between the inflow and outflow channels, fluid pressure in one chamber at one end and fluid pressure in the valve chamber at the other end) and pressure compensation by the counteracting force of the biasing force of a spring. A pressure compensating valve that displaces the valve body and adjusts the communication between the return path and the inflow path that communicate with the storage tank, and the spring ignition by the fluid to Byron 1.
When the selection valve body is moved against the force, the throttle valve throttles and communicates between the inflow path and the outflow path.
When adjusting the set pressure of pylon 1-fluid using the control valve, a pressure compensation valve is used to compensate for the differential pressure across the throttle valve at a constant level.
1; When adjusting the set pressure of the pilot fluid using the 13+1 type pressure control υII jr, the valve chamber is communicated with the outflow path, and the valve throttles the connection between the inflow and outflow paths.
A current-controlled flow adjustment valve is provided with a selection valve that communicates the valve chamber at the other end of the pressure compensating valve body with the storage tank so that the fluid in the inflow path is returned to the storage tank with almost no pressure.