JPH054009Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electro-hydraulic pressure regulator that can obtain an output pressure according to an input electrical signal.

[Prior art] Electrical technology that provides an output pressure according to an input electrical signal
Fluid pressure regulators are already known (see, for example, Japanese Utility Model Application No. 109209/1983).

In recent years, there has been an increasing need for compact fluid equipment in order to reduce the installation space. However, in a pilot-driven electric-hydraulic pressure regulator, the control section includes a pilot valve, a control board having a control circuit for the pilot valve, a pressure sensor, a feedback passage for feeding back output pressure to the pressure sensor, and the like. As a result, the control section becomes large, which is a problem in downsizing the electro-hydraulic pressure regulator.

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to provide a small electric-hydraulic pressure regulator by reducing the size of the control section.

[Means for solving the problem] In order to solve the above problem, the present invention has a main valve,
In the electro-hydraulic pressure regulator comprising a control section installed on the main valve, the control section is installed approximately perpendicularly to a pilot valve having a width narrower than the main valve and on one side in the width direction of the pilot valve. a control board having a control circuit for the pilot valve, a sensor spacer installed on the other side in the width direction, a pressure sensor installed approximately horizontally on the sensor spacer, and a flexible board that connects the pressure sensor and the control circuit. It is characterized by having a feedback flow path opened in the substrate and the sensor spacer for feeding back the output pressure to the pressure sensor.

Further, in order to solve the same problem, it is preferable to directly connect the pressure sensor mounted substantially perpendicularly to the sensor spacer and the control circuit of the control board through the terminal of the pressure sensor.

Furthermore, in order to solve the same problem, the pressure sensor and control board were installed almost horizontally on the pilot valve, and the terminals of the pressure sensor and the pilot valve were directly connected to the control circuit of the control board, so that no pressure could be applied to the pilot valve. It is preferable to provide a feedback flow path for feeding back the output pressure to the sensor.

[Operation and Effect] The space on the side of the pilot valve, which is narrower than the main valve, is effectively used to install the control board and sensor spacer in an approximately vertical position, and the pressure sensor is installed approximately horizontally on this sensor spacer. As a result, the control section can be made smaller, and thereby the electro-hydraulic pressure regulator can be made smaller.

In this case, the control circuit of the control board and the pressure sensor are connected using a flexible board, so even if they are installed in different orientations, no additional space is required for connection, and there is no feedback flow to the sensor spacer for mounting the pressure sensor. Since the passage is provided, the existing pilot valve can be used.

In addition, by arranging the pressure sensor and the control board in the same direction, the pressure sensor and control circuit can be directly connected through the terminals of the pressure sensor, making it easy to assemble both without increasing the number of parts. It can be made cheap.

Furthermore, by installing the pressure sensor directly on the pilot valve, which has a feedback flow path, almost horizontally, and installing the control board in the same direction, each terminal of the pressure sensor and pilot valve can be directly connected to the control circuit. In addition, the control section can be made even more compact.

[Embodiment] FIGS. 1 to 7 show a first embodiment of the present invention, and this electro-hydraulic pressure regulator includes a main valve 1, a control section 2, and a control section between the two, as shown in FIG. It is equipped with a spacer 3.

The valve body 5 of the main valve 1 includes a compressed air supply port P, an output port A, a discharge port R, a supply valve seat 6 in a flow path that communicates ports P and A, and a flow path that communicates ports A and R. Equipped with a discharge valve seat 7 in the road,
A supply valve body 8 and a discharge valve body 9, which open and close these valve seats 6 and 7, are slidably mounted on a valve stem 11 of a piston 10, and are attached to a large diameter portion 11 of the valve stem 11 by a valve spring.
It is biased in the direction of locking in a.

The valve body 5 has a pilot pressure chamber 12 partitioned by a piston 10, and a main valve feedback chamber 13 to which the fluid pressure of the output port A is fed back by a main valve feedback passage 14.
The valve bodies 8 and 9 are arranged such that when the fluid pressure in the pilot pressure chamber 12 is greater than the fluid pressure in the main valve feedback chamber 13, the valve element 8 opens the supply valve seat 6, and when it is smaller, the valve element 9 opens the discharge valve seat. Open room 7 and move to rooms 12 and 13.
When the fluid pressures are equal, both the valve seats 6 and 7 are closed, and the valve seats 6 and 7 and the valve seats behind the valve bodies 8 and 9 have approximately the same opening area.

The control unit 2 includes a base 20 on the spacer 3,
and a cover 21 that covers the base 20, and these are integrally attached to the valve body 5 by mounting screws, and a pilot valve 22 (see FIG. 1) which is narrower than the valve body 5 is attached to the base 20. A sensor spacer 23 is installed on the side of the pilot valve 22, and on the opposite side of the pilot valve from the sensor spacer,
A control board 24 provided with a control circuit for a pilot valve having integrated circuits 24a, . . . is installed substantially vertically.

The sensor part 26 of the pressure sensor 25 is mounted approximately horizontally on the sensor spacer 23 with screws 28, and the sensor board 27 is approximately mounted on the sensor part 26 by terminals 26a, . . . of the sensor part 28. It is installed horizontally, and the control circuit of the control board 24 and the sensor board 27 are electrically connected by the circuit of the flexible board 29.

The above control circuit, an example of which is shown in FIG. 7, uses the output signal of the pressure sensor 25 as a feedback signal.
The magnitude of the input electrical signal is compared with that, and if the input electrical signal is large, an on/off signal is output to the solenoid section of the pilot valve 22 (described later) to supply pilot air to the pilot pressure chamber 12, and if the input electrical signal is small, It is configured to discharge air from the pilot pressure chamber 12 to the outside.

The pilot valve 22 is connected to a control circuit by a lead wire 30, and the control circuit is connected to an external lead wire 31 inserted through the base 20, and connects the air pressure in the pilot pressure chamber 12 to the sensor section 26 through the sensor spacer 23. A feedback channel 32 for feedback is provided. Although not shown, the feedback flow path 32 connects to the main valve feedback chamber 13 via a throttle.
It may be communicated with.

Reference numeral 33 in FIG. 1 is an elastic body that supports the lower end of the control board 24.

The pilot valve 22 shown in detail in FIG. 5 includes a pilot valve section 40 and a solenoid section 41.
A supply valve seat 43 in a flow path that communicates between ports 40b and 40b and a discharge valve seat 44 in a flow path that communicates ports 40b and 40c are provided, and a supply valve body 45 that opens and closes the supply valve seat 43 is attached to a movable iron core to be described later. The discharge valve body 46 which opens and closes the discharge valve seat 44 is attached to a support 47 having a plurality of legs.
is biased by a spring 48 in the direction of closing the valve seat 44.

On the other hand, the solenoid section 41 includes a coil 52 wound around a bobbin 51, a fixed iron core 53, and a movable iron core 5.
4, a magnetic frame 55 that covers these, and a movable iron core 54
A recess 53a and a protrusion 54a that loosely fit into the recess are formed on the opposing surfaces of the iron cores 53 and 54, and these uneven parts reduce the sensitivity of the suction force, thereby reducing wear. The decrease in the level of suction force due to the increase in the distance between the iron cores based on this can be reduced, thereby preventing malfunctions due to wear, thereby improving the durability of the pilot valve 22. Also. The movable core 54 is provided with an elastic member 56 that penetrates through the central portion, the valve seat 43 side of the elastic member 56 constitutes the supply valve body 45, and the protrusion on the fixed core side serves as a buffer for mitigating the collision between the cores 53 and 54. It makes up the department. However, the supply valve body and the buffer portion may be separately provided on both end faces of the movable core.

The movable core 54 is guided by a guide member 57 made of a wear-resistant material.
Breathing holes 58, . . . are formed in the bobbin 51 in the axial direction (see FIG. 6). Reference numeral 59 in FIG. 5 is a manual operation button.

As shown in FIG. 4, the input port 40a and the discharge port 40c of the pilot valve 22 are connected to the supply channel 6
The output port 40b is connected to the supply port P and the discharge port R of the main valve individually through the output port 40b and the discharge passage 62.
communicates with the pilot pressure chamber 12 through an output passage 63, and the feedback passage 32 opens into the pilot pressure chamber 12.

In the electro-hydraulic pressure regulator of the first embodiment, when an input signal for obtaining a certain set pressure is input to the control circuit, if the feedback signal from the pressure sensor 25 is smaller than the input signal, the pilot valve 2
Pilot air is output from the output port 40b of the pilot valve 22, and if the feedback signal from the pressure sensor 25 is larger than the input signal, the ports 40b and 40c of the pilot valve 22 communicate with each other and the pilot air is discharged. Pilot pressure chamber 1
The air pressure of No. 2 is set to a predetermined pressure determined by an input signal.

Subsequently, if the air pressure in the pilot pressure chamber 12 is greater than the air pressure in the feedback chamber 13, the piston 10 will move downward in the figure, and the flow path between ports P and A of the main valve 1 will communicate with each other, and the output port A will open. Air pressure increases. When the air pressure in the feedback chamber 13 increases due to the increase in the air pressure at the output port A, the piston 10 rises in the figure, and the main valve 1
The flow path between ports A and R of is communicated with each other, and the output pressure decreases.

Therefore, the air pressure at the output port A is set to the air pressure in the pilot chamber 12, in other words, to a predetermined pressure determined according to the input electrical signal.

The first embodiment takes advantage of the fact that the width of the pilot valve 22 is narrower than the width of the main valve 1, and installs the control board 24 substantially vertically on one side in the width direction, and installs the sensor on the other side. By installing the spacer 23 and further providing the pressure sensor 25 substantially horizontally on the sensor spacer 23, the control unit 2 can be made smaller, and therefore the electric-hydraulic pressure regulator can be made smaller. can.

In this case, even if the substrates 24 and 27 are installed in different orientations, since they are connected by the flexible substrate 29, the connection is easy and the space for the connection does not increase. Further, by providing the feedback passage 32 in the sensor spacer 23, an existing pilot valve can be used as is.

FIG. 8 shows a second embodiment of the present invention, in which a pressure sensor 71 in a control section 70 of the second embodiment is mounted substantially perpendicularly to a sensor spacer 72, and is mounted substantially perpendicularly to one side of a pilot valve 22. The control circuit of the installed control board 73 and the pressure sensor 71 are directly connected through terminals 74, . . . of the sensor 71.

In the second embodiment, since a flexible board is not required, the number of parts is reduced and the cost can be reduced. These parts are easy to assemble.

The other configurations and operations of the second embodiment are the same as those of the first embodiment, so the same reference numerals are given to the main parts in the drawings, and detailed explanations will be omitted.

9 to 11 show a third embodiment of the present invention, in which a pilot valve 81 in a control section 80 of the third embodiment is provided with a feedback passage 82, and a pressure sensor 83 is provided with a feedback passage 82 on the pilot valve 81. The control board 84 is directly installed substantially horizontally at the opening position of the flow path 82, and is mounted on the pressure sensor 83 to the pilot valve 81 and the base 20 by mounting screws 86, 86 passing through spacers 85, 85. , the control circuit of the control board 84 and the pressure sensor 8
3, and the control circuit of the control board 84 and the pilot valve 81 are connected to the terminals 87, . . . of the pressure sensor 83, respectively.
. . , and the terminals 88 of the pilot valve 81, .

The other configurations and operations of the third embodiment are the same as those of the first embodiment, so the same reference numerals are given to the main parts in the drawings, and detailed explanations will be omitted.

Since the third embodiment does not have a flexible substrate and a sensor spacer, the configuration is simplified and the control section 80 is further reduced in size, making it possible to make the regulator even more compact. Since the terminals 88, . . . are directly connected, assembly is easy.

Note that the directions "up", "down", "vertical", and "horizontal" in the specification refer to the directions in the state shown in FIG. 4, and are unrelated to the installation orientation of the electro-hydraulic pressure regulator.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical side view showing the main parts of the first embodiment, FIG. 2 is a front view of the same without the cover, FIG. 3 is a plan view of the same, and FIG. 5 is a longitudinal sectional view showing an example of the pilot valve, and FIG. 6 is a longitudinal sectional view showing an example of the pilot valve.
A sectional view, FIG. 7 is a circuit diagram showing an example of a control circuit, FIG. 8 is a longitudinal side view showing the main parts of the second embodiment, and FIG. 9 is a longitudinal front view showing the main parts of the third embodiment. , FIG. 10 is a side view of the same, and FIG. 11 is a plan view of the same. 1... Main valve, 2, 70, 80... Control section, 2
2,81...Pilot valve, 23,72...Sensor spacer, 24,73,84...Control board, 2
5, 71, 83...Pressure sensor, 29...Flexible board, 32, 82...Feedback channel, 74, 87...Terminal.

Claims (1)

[Claims for Utility Model Registration] 1. An electro-hydraulic pressure regulator comprising a main valve and a control unit installed on the main valve, wherein the control unit includes a pilot valve having a width narrower than that of the main valve, and a control unit installed on the main valve. A control board with a control circuit for the pilot valve installed approximately vertically on one side of the pilot valve in the width direction, a sensor spacer installed on the other side in the width direction, and a pressure sensor installed approximately horizontally on the sensor spacer. An electro-hydraulic pressure regulator comprising: a sensor; a flexible substrate for connecting the pressure sensor and a control circuit; and a feedback passage provided in a sensor spacer for feeding back output pressure to the pressure sensor. . 2. In an electro-hydraulic pressure regulator comprising a main valve and a control unit installed on the main valve, the control unit includes a pilot valve narrower than the main valve and one side in the width direction of the pilot valve. A control board with a control circuit for a pilot valve installed approximately perpendicular to the sensor spacer, a sensor spacer installed on the other side in the width direction, and a control circuit for the pilot valve installed approximately perpendicular to the sensor spacer, directly connected to the control circuit. a pressure sensor having a terminal for the pressure sensor, and a feedback flow path opened in the sensor spacer for feeding back the output pressure to the pressure sensor. An electro-hydraulic pressure regulator comprising: 3. In an electro-hydraulic pressure regulator comprising a main valve and a control unit installed on the main valve, the control unit includes a pilot valve having a width narrower than the main valve, and a pilot valve directly on the pilot valve approximately horizontally. A pressure sensor installed, a control board installed on the pressure sensor in the same direction as the control board and having a control circuit for the pilot valve, terminals of the pressure sensor and the pilot valve that are directly connected to the control circuit, and the pilot valve. An electric-hydraulic pressure regulator, characterized in that it is equipped with a feedback flow path for feeding back output pressure to a pressure sensor, which is opened in the above.