KR101375218B1 - Drive circuit for pneumatic actuator reusing exhaust gas - Google Patents

Abstract

One embodiment of the present invention relates to a drive circuit of a pneumatic actuator, comprising: a first solenoid valve having a supply port into which a compressor body is introduced; A second solenoid valve connected to the first solenoid valve while forming a first flow path and a second flow path together with the first solenoid valve; A pneumatic actuator driven when in communication with the first flow passage and the second flow passage; And a power supply connected to energize the first solenoid valve and the second solenoid valve, thereby exhausting the compressor body and reusing a part, thereby reducing the energy used during compression.

Description

DRIVE CIRCUIT FOR PNEUMATIC ACTUATOR REUSING EXHAUST GAS}

One embodiment of the present invention relates to a drive circuit of a pneumatic actuator for reusing exhaust, and more particularly, to reduce the energy used during compression by exhausting the compressor body, such as compressed air, to the outside atmosphere, without reusing it completely. It relates to a drive circuit of a pneumatic actuator that can be.

In general, a pneumatic actuator is a device that converts the pressure energy of the compressor body into mechanical energy and performs mechanical work such as linear motion and rotational motion. In order to drive such a pneumatic actuator, a driving circuit is required, which includes, for example, a compressor that sucks and compresses air in the atmosphere to generate a compressor body, a tank connected to an outlet of the compressor to store the compressor body, and a flow of the compressor body. A direction control valve for controlling the direction, a speed control valve for controlling the speed of the pneumatic actuator by adjusting the flow rate of the compressor body, and a flow path for communicating each port of the tank or valve. In addition, the drive circuit may further include a filter, an oil controller, an air dryer, etc. for removing dust, oil mist, moisture, etc. in the compressor body to make a clean compressor body.

Since the pneumatic actuator reciprocates in structure, the next operation can be performed by exhausting the internal compressor body. At this time, the evacuated compressor body is not reused unless it is provided with a separate storage means. Therefore, in the above-described driving circuit, since the compressor body exhausted from the pneumatic actuator is discharged to the outside atmosphere, the consumption of the compressor body increases, and there is a problem that the energy consumed in a large amount and the power required increase.

Accordingly, an embodiment of the present invention is to provide a driving circuit of a pneumatic actuator that can reduce the energy used during compression by exhausting the compressor body, such as compressed air, etc. to the outside to completely consume without reuse. have.

A drive circuit of the pneumatic actuator according to an embodiment of the present invention, the first solenoid valve having a supply port through which the compressor body is introduced; A second solenoid valve connected to the first solenoid valve while forming a first flow path and a second flow path together with the first solenoid valve; A pneumatic actuator driven when in communication with the first passage and the second passage; And a power source connected to energize the first solenoid valve and the second solenoid valve.

According to the present invention as described above, it is possible to reduce the energy used during compression by exhausting the compressor body but reusing a part, and because it does not have to be provided with a separate storage means, the cost of the circuit configuration is simplified And there is an effect to reduce the process.

1 is a configuration diagram schematically showing a driving circuit of a pneumatic actuator according to an embodiment of the present invention.
2 is a configuration diagram sequentially showing the operation sequence of the driving circuit of the pneumatic actuator according to an embodiment of the present invention.
3 is a cross-sectional view showing in more detail the second solenoid valve provided in the driving circuit of the pneumatic actuator according to an embodiment of the present invention.
4 is a cross-sectional view showing an example of a state in which the second solenoid valve shown in FIG. 3 operates.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear.

1 is a configuration diagram schematically showing a driving circuit of a pneumatic actuator according to an embodiment of the present invention. As shown in the drawing, the driving circuit of the pneumatic actuator according to the present invention includes a first solenoid valve 10 having a supply port P into which the compressor body is introduced; A second solenoid valve 20 connected to the first solenoid valve 10 while forming a first flow passage A1 and a second flow passage B2 together with the first solenoid valve 10; A pneumatic actuator 30 extending or contracting when communicating with the first passage A1 and the second passage B2; And a power source 40 connected to energize the first solenoid valve 10 and the second solenoid valve 20.

The compressor body is produced, for example, via a compressor (not shown) that sucks and compresses air in the atmosphere. Either upstream or downstream of such a compressor may further include a dehumidifier or air dryer for removing moisture from the air, a filter for removing foreign substances such as dust in the air, an oil controller for removing oil mist, and the like. The compressor is preferably driven by a constant speed or variable speed electric motor to maintain approximately constant air pressure, and may be connected to a tank or the like configured to store the compressor body.

The first solenoid valve 10 communicates with the compressor and has a pair of input / output ports A and B to which a supply port P, a first flow passage A1, and a second flow passage B2 are connected, respectively. ), A normally open two-position five-port valve having a pair of exhaust ports R ₁ and R ₂ for exhaust and a pair of solenoids 11a and 11b. Since the first solenoid valve 10 having such a configuration can be purchased as a variety of products on the market, a detailed description thereof will be omitted.

However, to briefly describe only the operation, the first solenoid valve 10 is held in the position after the operation when the solenoids 11a and 11b are turned off together and is not returned. By turning solenoid 11a or 11b on by the electricity supplied, making input / output ports A and B communicate with one of supply port P and discharge port R ₁ , R ₂ , respectively. At the same time the remaining discharge ports R ₂ or R ₁ are intended to be closed.

The second solenoid valve 20 constituting the main aspect of the present invention includes a first input / output port 1 connected to the first flow path A1 and a second input / output port 2 connected to the second flow path B2. A third I / O port 3 in communication with the first port 31 of the pneumatic actuator 30, a fourth I / O port 4 in communication with the second port 32 of the pneumatic actuator 30, and It consists of a 3 position 4 port double type valve provided with a pair of solenoid 21a, 21b. The second solenoid valve 20 is in a neutral position when the solenoids 21a and 21b are turned off together, and the first input / output port 1 and the third input / output port 3 communicate with each other. The second input / output port 2 and the fourth input / output port 4 are in communication with each other. In addition, the second solenoid valve 20 turns on the solenoids 21a or 21b so that the third input / output port 3 and the fourth input / output port 4 communicate with each other, and the first input / output port ( 1) and the second input / output port 2 are closed.

At this time, the first port 31 and the second solenoid valve 20 of the pneumatic actuator 30 are not discharged to the outside by the reciprocating motion of the pneumatic actuator 30 alternately discharged from the cylinder tube 33 to the outside. The flow path between the third input / output port 3 of the second channel, the flow path between the third input / output port 3 and the fourth input / output port 4 of the second solenoid valve 20, and the second solenoid valve 20. It is maintained in the flow path between the 4 input-output port 4 and the second port 32 of the pneumatic actuator 30. This compressor body is subsequently mixed with the high pressure compressor body flowing from the compressor and recycled cyclically. Therefore, compared to the prior art that the compressor body is discharged to the outside every time it operates reversely, it is possible to drive the pneumatic actuator 30 with the power consumption of the electric motor approximately half, thereby saving energy. Will be.

3 is a cross-sectional view showing in more detail the second solenoid valve provided in the driving circuit of the pneumatic actuator according to an embodiment of the present invention, Figure 4 is an example of a state in which the second solenoid valve shown in FIG. It is sectional drawing which shows.

As shown in the drawing, the second solenoid valve 20 includes a first hollow portion 221 formed in a longitudinal direction at the center thereof, and a pair of second hollow portions formed to communicate with both ends of the first hollow portion 221. 222a and 222b formed at opposite sides of the first hollow portion 221 in the second hollow portions 222a and 222b to the second hollow portions 222a and 222b through the through holes 224a and 224b. A pair of third hollow portions 223a and 223b formed in communication, a third input / output port 3 and a fourth input / output port 4 communicating with the first hollow portion 221 on one side, and a first hollow on the other side, respectively. A substantially tubular shape provided with a first input / output port 1 and a second input / output port 2 communicating with the third hollow portion 223a and 223b through the pressurizing flow passages 225a and 225b while communicating with the part 221. Main body 22; A spool 23 installed slidably in the first hollow portion 221 and controlling the flow of the compressor body according to the movement position; A pair of solenoids 21a and 21b installed at both ends of the main body 22 and operating by electricity applied from the power source 40; They are installed in the plungers 211a and 211b of the solenoids 21a and 21b, respectively, and are inserted through the third hollow portions 223a and 223b, and the through holes 224a and 224b are moved as the plungers 211a and 211b move. A pair of actuating valves 24a and 24b configured to open and close; A pair of sliders 25a and 25b installed in the second hollow portions 222a and 222b to be slidably axially and controlling the position of the spool 23 according to the movement; And a spring 26 interposed between the spool 23 and each of the sliders 25a and 25b in the second hollow portions 222a and 222b.

In addition, the spool 23 includes a plurality of enlarged diameter portions 231 arranged at regular intervals in the axial direction, shaft diameter portions 232 between adjacent enlarged diameter portions 231, and tips and ends of each enlarged diameter portion 231. The sealing part 233, such as an O-ring, interposed between the inner peripheral surfaces of the one hollow part 221 is provided. Moreover, the sliders 25a and 25b are formed in substantially T-shape, and the exhaust hole 251 of the micro diameter is provided in the axial direction.

The operation principle of the second solenoid valve 20 of this configuration is that the plunger 211a or 211b is drawn into the solenoid 21a or 21b by electricity applied to one of the pair of solenoids 21a and 21b. Will be pulled. For example, when the solenoid 21b on the right side of the drawing is operated as shown in FIG. 4, the actuating valve 24b moves together with the plunger 211b to open the through hole 224b. Subsequently, the pressure gas is transferred to the third hollow portion 223b through the pressurized flow passage 225b communicated with the second input / output port 2, and the pressure gas passes through the through hole 224b to form the second hollow hole. The slider 25b is pushed toward the spool 23 in the portion 222b. The slider 25b pushes the spool 23 further, and eventually the spool 23 is positioned to be deflected to the left as the spool 23 comes into contact with the opposite slider 25a.

Here, when the spool 23 is pushed to the opposite slider 25a, the gas in the second hollow portion 222a where the opposite slider 25a is positioned is exhausted through the exhaust hole 251 and the through hole of the opposite slider 25a. After passing through 224a, the operation valve 24a is pushed out. To this end, a spring 241 may be interposed between the plunger 211a and the operation valve 24a.

When the enlarged diameter portion 231 is moved to the left side as shown in FIG. 4 due to the deflection of the spool 23, the third input / output port 3 and the fourth along the shaft diameter portion 232 between the enlarged diameter portions 231. A flow path through which the input / output port 4 communicates is formed, and the first input / output port 1 and the second input / output port 2 are closed. The same flow path is formed even when the spool 23 moves in the reverse direction.

On the other hand, when the solenoids 21a and 21b are turned off, the springs 26 installed in the respective second hollow portions 222a and 222b are shot to return the spool 23 and the corresponding slider 25b to their original positions. Let's do it. Of course, the plunger 211b in the solenoid 21b is also pushed back to its original position by the spring force of the spring 212, and the operation valve 24b moves to close the through hole 224b.

When the second solenoid valve 20 is in the neutral position as shown in FIG. 3, that is, the enlarged diameter portion 231 in the center of the spool 23 is connected to the third input / output port 3 and the fourth input / output port ( 4), the first I / O port 1 and the third I / O port 3 are formed along the periphery of the shaft diameter portion 232 of the spool 23, and at the same time, the second I / O port is formed. A flow path through which (2) and the fourth input / output port 4 communicate is formed.

Referring to FIG. 1, the power source 40 is connected in parallel with the first solenoid valve 10 and the second solenoid valve 20, and in particular, the first solenoid valve 10 and the second solenoid valve 20 The solenoids 11a, 21a or 11b, 21b are connected to simultaneously apply electricity.

The pneumatic actuator 30 is preferably a double-acting cylinder in which the compressor body is alternately supplied to both sides to reciprocate the piston 34 in a forward or backward motion. The pneumatic actuator 30 has a first port 31 which can communicate with the first passage A1 and a second port 32 which can communicate with the second passage B2 in the cylinder tube 33. . If intake is made at one of these ports 31, 32, the exhaust is reversed at the other.

Now, the operation of the driving circuit of the pneumatic actuator according to an embodiment of the present invention will be described.

2 is a configuration diagram sequentially showing the operation sequence of the driving circuit of the pneumatic actuator according to an embodiment of the present invention.

First, in the state of FIG. 1, the first solenoid valve 10 and the second solenoid valve 20 are off together, and the supply port P of the first solenoid valve 10 is, for example, one side input / output port ( While communicating with A), the other input / output port B communicates with the discharge port R ₂ . The remaining discharge port R ₁ is closed. In addition, one input / output port A of the first solenoid valve 10 communicates with the first input / output port 1 of the second solenoid valve 20 to form a first flow path A1, while the other input / output port A B) communicates with the second input / output port 2 to form a second flow path B2. In addition, the second solenoid valve 20 is in a neutral position, and the first input / output port 1 and the third input / output port 3 communicate with each other, and the second input / output port 2 and the fourth input / output port 4 You will be in communication. The third input / output port 3 of the second solenoid valve 20 communicates with the first port 31 of the pneumatic actuator 30, and the fourth input / output port 4 communicates with the second port 32. In the case of FIG. 1, the first passage A1 constitutes an intake path, and the second passage B2 constitutes an exhaust path.

When a compressor (not shown) is driven by an electric motor in such a state, the compressor sucks air from the atmosphere and compresses it to generate a compressor body. The compressor body has a supply port P of the first solenoid valve 10 and one input / output port A, a first flow path A1, and a first input / output port 1 and a third of the second solenoid valve 20. It is supplied to one side in the cylinder tube 33 through the input / output port 3 and the first port 31 of the pneumatic actuator 30.

The discharge port R ₂ of the first solenoid valve 10 and the other input / output port B, the second flow path B2, the second input / output port 2 and the fourth input / output port (2) of the second solenoid valve 20 ( 4) and the second port 32 of the pneumatic actuator 30 are at atmospheric pressure together.

Accordingly, the pneumatic actuator 30 is stopped at the required position, for example, the retracted position.

As shown in (a) of FIG. 2, a command signal is applied by a switch or the like installed in a control room (not shown) to apply electricity from the power supply 40 to provide a corresponding solenoid of the first solenoid valve 10 and the second solenoid valve 20. (11b, 21b) is turned on at the same time (on) and the woman (여자).

In this case, as shown in FIG. 2B, the first solenoid valve 10 and the second solenoid valve 20 are driven.

In the first solenoid valve 10, the input / output port B communicates with the supply port P, and the input / output port A is switched to communicate with the discharge port R ₁ . While the compressor body is supplied to the second flow path B2, the compressor body in the first flow path A1 is discharged into the atmosphere through the input / output port A and the discharge port R ₁ . The remaining discharge port R ₂ is closed.

In addition, since the compressor body is supplied to the second flow path B2, the compressor body is transferred from the second solenoid valve 20 to the second input / output port 2. As described with reference to FIG. 4, the pressure gas is sent to the third hollow portion 223b through the pressure passage 225b communicating with the second input / output port 2, and the pressure gas passes through the hole. The slider 25b is pushed toward the spool 23 in the second hollow portion 222b through the 224b. As a result, the slider 25b pushes the spool 23 into contact with the opposite slider 25a so that the spool 23 is positioned to be deflected to one side (left side in FIG. 4). As the enlarged diameter portion 231 in the spool 23 is moved, a flow path through which the third input / output port 3 and the fourth input / output port 4 communicate with each other along the shaft diameter portion 232 between the enlarged diameter portions 231. Is formed, and the first I / O port 1 and the second I / O port 2 are closed.

At this time, the compressor body is communicated with the fourth input / output port 4 and the fourth input / output port 4 from the third input / output port 3 of the second solenoid valve 20 in communication with the first port 31 of the pneumatic actuator 30. It will flow into the two port (32).

As a result, the gas pressures on both sides of the piston 34 in the cylinder tube 33 of the pneumatic actuator 30 are equal, so that the piston 34 stops at an intermediate position.

According to the present invention, the compressor body discharged from the cylinder tube 33 due to the movement of the piston 34 in the pneumatic actuator 30 is not discharged to the outside, but rather becomes a low pressure state through the second solenoid valve 20. Recovered to the pneumatic actuator 30. This compressor body is subsequently communicated with the first flow passage A1 or the second flow passage B2 and mixed with the high pressure compressor body flowing from the compressor and recycled cyclically. Therefore, the power consumption of the electric motor can be approximately half, and this has the advantage of saving energy.

After a predetermined time, which is pre-programmed in the control room, if the electricity applied from the power source 40 is cut off as shown in FIG. 2C, the first solenoid valve 10 is maintained at the operated position and does not return.

However, as described with reference to FIG. 4, the second solenoid valve 20 has springs 26 installed in each of the second hollow portions 222a and 222b, and the spool 23 and the corresponding slider 25b are opened. Return to home position. In this way, when the second solenoid valve 20 is in the neutral position, that is, when the enlarged diameter portion 231 in the center of the spool 23 moves to the center, the second solenoid valve 20 moves around the shaft diameter portion 232 of the spool 23. A flow path through which the first input / output port 1 and the third input / output port 3 communicate with each other is formed, and a flow path through which the second input / output port 2 and the fourth input / output port 4 communicate with each other is formed.

As a result, in FIG. 2C, the first solenoid valve 10 and the second solenoid valve 20 are turned off together, and the supply port P of the first solenoid valve 10 is, for example, the other input / output. While communicating with the port B, one input / output port A communicates with the discharge port R ₁ . The remaining discharge port R ₂ is still closed. In addition, one input / output port A of the first solenoid valve 10 communicates with the first input / output port 1 of the second solenoid valve 20 to form a first flow path A1. A1) is an exhaust path. On the other hand, the other input / output port B communicates with the second input / output port 2 to form a second flow path B2, which is the intake path. In addition, the second solenoid valve 20 is in a neutral position, and the first input / output port 1 and the third input / output port 3 communicate with each other, and the second input / output port 2 and the fourth input / output port 4 You will be in communication. The third input / output port 3 of the second solenoid valve 20 communicates with the first port 31 of the pneumatic actuator 30, and the fourth input / output port 4 communicates with the second port 32.

The compressor body includes the supply port P of the first solenoid valve 10 and the other input / output port B, the second flow path B2, and the second input / output port 2 and the fourth input / output of the second solenoid valve 20. It is supplied to the other side in the cylinder tube 33 through the port 4 and the second port 32 of the pneumatic actuator 30.

The discharge port R ₁ of the first solenoid valve 10 and the one input / output port A, the first flow path A1, and the first input / output port 1 and the third input / output port of the second solenoid valve 20 ( 3) and the first port 31 of the pneumatic actuator 30 together become atmospheric pressure.

Accordingly, the pneumatic actuator 30 is stopped at another position, for example, the extended position.

Thereafter, when the pneumatic actuator 30 is to be driven to the oppositely retracted position, only the direction is reversed and the operation sequence is the same, so the detailed description thereof is omitted.

Therefore, the pneumatic actuator 30 reciprocates by the operation of the first solenoid valve 10 and the second solenoid valve 20.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied otherwise without departing from the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10: first solenoid valve
20: second solenoid valve
30: pneumatic actuator
40: Power supply

Claims (10)

A first solenoid valve having a supply port into which the compressor body is introduced;
A second solenoid valve connected to the first solenoid valve while forming a first flow path and a second flow path together with the first solenoid valve;
A pneumatic actuator driven when in communication with the first passage and the second passage; And
A power source connected to energize the first solenoid valve and the second solenoid valve
≪ / RTI >
The first solenoid valve includes a supply port through which the compressor body is introduced, a pair of input / output ports to which the first flow path and the second flow path are respectively connected, a pair of discharge ports for exhausting, and a pair of solenoids A drive circuit for a pneumatic actuator that is a two-position five-port valve having a. delete The method of claim 1,
And the first solenoid valve is held in the operated position when it is turned off. The method of claim 1,
The second solenoid valve may include a first input / output port connected to the first channel, a second input / output port connected to the second channel, a third input / output port communicating with a first port of the pneumatic actuator, and the pneumatic actuator. A drive circuit for a pneumatic actuator, which is a three-position four-port valve having a fourth input / output port communicating with a second port, and a pair of solenoids. 5. The method of claim 4,
The second solenoid valve is in a neutral position when it is turned off, the first input and output port and the third input and output port is in communication with the second input and output port and the fourth input and output port is in communication,
The second solenoid valve is turned on so that the third input / output port and the fourth input / output port communicate with each other, and the first input / output port and the second input / output port are closed. A first solenoid valve having a supply port into which the compressor body is introduced;
A second solenoid valve connected to the first solenoid valve while forming a first flow path and a second flow path together with the first solenoid valve;
A pneumatic actuator driven when in communication with the first passage and the second passage; And
A power source connected to energize the first solenoid valve and the second solenoid valve
≪ / RTI >
The second solenoid valve is,
A first hollow portion formed in a longitudinal direction at a center thereof, a pair of second hollow portions formed in communication with both ends of the first hollow portion, and formed on opposite sides of the first hollow portion at the second hollow portion to form a through hole; A pair of third hollow portions formed in communication with the second hollow portion, a third input and output port and a fourth input and output port communicating with the first hollow portion at one side, and a pressurized flow passage communicating with the first hollow portion at the other side, respectively; A main body provided with a first input / output port and a second input / output port communicating with the third hollow portion through;
A spool installed slidably in the first hollow portion and controlling a flow of the compressor body according to a moving position;
A pair of solenoids installed at both ends of the main body and operated by electricity applied from the power source;
A pair of operation valves installed in the plungers of the solenoid and inserted through the third hollow part to open and close the through holes according to the movement of the plunger;
A pair of sliders slidably installed in the second hollow portion and controlling the position of the spool according to the movement; And
A spring interposed between the spool and the slider in the second hollow portion
Drive circuit of the pneumatic actuator comprising a. The method according to claim 6,
The spool has a pneumatic pressure including a plurality of enlarged diameter portions arranged at regular intervals in the axial direction, shaft diameter portions between the adjacent enlarged diameter portions, and a sealing portion interposed between the distal end of each of the enlarged diameter portions and the inner circumferential surface of the first hollow portion. Actuator drive circuit. The method according to claim 6,
The slider is a drive circuit of the pneumatic actuator provided with the exhaust hole in the axial direction. The method according to claim 6,
The second solenoid valve is in a neutral position when it is turned off, the first input and output port and the third input and output port is in communication with the second input and output port and the fourth input and output port is in communication,
When the second solenoid valve is turned on, the spool is biased so that the third input / output port and the fourth input / output port communicate with each other, and the pneumatic actuator closes the first input / output port and the second input / output port. Driving circuit. 10. The method of claim 9,
And a driving circuit of the pneumatic actuator in which the spool is returned to the neutral position by the spring force of the spring when the second solenoid valve is turned off.

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