JP2534560Y2 - Gas pressure servo system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure servo system.

[0002]

2. Description of the Related Art Conventionally, as a fluid pressure servo system,
A hydraulic servo system having a large output and good dynamic characteristics is known, but in this system, there is a risk of contamination due to oil leakage and an increase in the capacity of the oil tank has limitations in disaster prevention. Therefore,
For example, as a fluid pressure servo system used for a ski simulator or the like, as shown in the system diagram of FIG. And a high-pressure chamber 05 having a relief valve 04 connected thereto via a pipe 03a into which a check valve 03 is inserted, and an air supply port 07 and an exhaust port 0 connected thereto via a pipe 06.
8. Servo valve 011 having load ports 09 and 010
And a gas pressure cylinder 0 in which an upper pressure chamber and a lower pressure chamber are connected to load ports 09 and 010 via piping, respectively.
There is known a gas pressure servo system composed of a piston 12 and a load 013 attached to an upper end of the piston rod. In order to operate the load 013 in this type of system, for example, to raise the load 013 in the figure, an electric signal is sent from the outside to the servo valve 011, and the gas of the air supply port 07 is supplied from the load port 010 by this action. Then, the gas in the lower pressure chamber of the gas pressure cylinder 012 is supplied to the gas pressure cylinder 012, and the gas in the upper pressure chamber of the gas pressure cylinder 012 is discharged to the atmosphere via the load port 09, the exhaust port 08, and the pipe 014.

However, in such a system,
It has the following disadvantages. (1) In order to improve the characteristic dynamic characteristics, the pressure on the high pressure side of the gas pressure cylinder 012 is increased, and the pressure on the low pressure side is increased by increasing the overlap of the spool of the servo valve 011. However, if these pressures are set too high, the effective differential pressure of the gas pressure cylinder 012 will decrease, and the power consumption of the system will increase. (2) When the pressure on the low pressure side of the gas pressure cylinder 012 increases due to the above (1), the throttle on the exhaust side of the spool exceeds the critical pressure and becomes a sonic flow, so that the flow resistance increases,
The non-linearity of the relationship between the spool valve opening and the flow rate increases, and the controllability of the system is reduced.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of such circumstances, and has good dynamic characteristics and low gas compression power, and therefore has excellent controllability and economical gas pressure. It is intended to provide a servo system.

[0005]

For this purpose, the present invention provides a gas pressure servo system for supplying gas pressurized by a compressor and stored in a high pressure chamber to a gas pressure cylinder via a servo valve. A low-pressure chamber inserted into a return pipe connecting the exhaust port of the compressor and the compressor, a check valve inserted into the return pipe downstream of the low-pressure chamber, and a first three-way valve for gas suction. A second three-way valve inserted into a downstream pipe of the compressor and a check valve inserted into a circulation pipe connecting the low-pressure chamber.

[0006]

According to such a configuration, the following operation is performed. Since a low-pressure chamber is provided at the return pipe connecting the servo valve exhaust port and the compressor, the pressure ratio on the exhaust side of the servo valve does not become excessive, so that the flow resistance is reduced and the gas compression is reduced. Power is reduced. In the return pipe, a check valve and a first three-way valve for gas suction inserted downstream of the low-pressure chamber, and a second three-way valve and low-pressure chamber inserted in a downstream pipe of the compressor are provided. And a check valve inserted into a circulation pipe connecting the pressure chambers, so that a single compressor can accumulate pressure in each of the high-pressure chamber and the low-pressure chamber.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described with reference to the drawings. The same reference numerals as in FIG. 2 denote the same members as those in FIG. 2, and in FIG. 1 system diagram, 1 denotes an exhaust port 08 of a servo valve 011. A return pipe connecting the suction port of the compressor 02,
2 is a low-pressure chamber having a relief valve 3 inserted into the return pipe 1; Is a three-way valve inserted immediately after the compressor 02 in the pipe 03a, and 7 is a check valve inserted in the circulation pipe 8 connecting the three-way valve 6 and the low-pressure chamber 2.

In such a system, the load 013
As shown in the figure, the low pressure chamber 2
Is pressurized by the compressor 02 and the high pressure chamber 05
After accumulating the gas, the gas is supplied to the upper pressure chamber of the gas pressure cylinder 012 via the air supply port 07 and the load port 09 of the servo valve 011 or to the gas pressure cylinder 012 via the load port 010 based on an external electric signal. The gas is supplied to the lower pressure chamber, and the gas from the lower pressure chamber and the load port 010 of the gas pressure cylinder 012 or the gas from the upper pressure chamber and the load port 09 is returned to the low-pressure chamber 2 via the exhaust port 08 and the return pipe 1. Also, gas pressure cylinder 012
In order to maintain the pressure of the gas in the low-pressure chamber 2 due to leakage from the like, the three-way valves 5 and 6 are turned in the directions indicated by arrows 9 and 10 in FIG. Pressurization is performed by supplying the low-pressure chamber 2 through the circulation pipe 8 and the like. Here, when considering the flow velocity on the exhaust side of the servo valve 011, the condition where the velocity becomes sonic flow is generally that when the gas is air, the pressure ratio between the high pressure side and the low pressure side is 1.9. Supply pressure 10
(Kgf / cm ² ) G, the equilibrium pressure between high pressure and low pressure when the gas pressure cylinder 012 is not loaded is slightly higher than the average of the supply pressure and the exhaust pressure which is the atmospheric pressure.
/ Cm ² ) G, and the pressure ratio at that time is 6-7. In this regard, in this embodiment, the supply pressure, that is, the high pressure chamber 0
By providing the low-pressure chamber 2 at a pressure of about 1/2 with respect to the pressure of 5, for example, the pressure of the high-pressure chamber 05 is set to 20 (kgf / cm ² ) G and the pressure of the low-pressure chamber 2 is set to 10 (kgf / cm ² ). Assuming that kgf / cm ² ) G, the equilibrium pressure of the gas pressure cylinder 012 is about 15 (kgf / cm ² ) G, and the pressure ratio on the exhaust side is at most about 1.5, so that there is no sonic flow. . Further, when considering the gas compression power, since this increases in proportion to the pressure ratio, the pressure ratio generally increases in a high-pressure compressor such as 20 to 50 (kgf / cm ² ) G, and therefore, in a known system, a large gas ratio is obtained. Although compression power is required, in this embodiment, the pressure ratio of the compressor 02 is (20 + 1) (kgf / c
m ² ) / (10 + 1) (kgf / cm ² ) = 1.9,
Since the pressure ratio is small, less gas compression power is required.

According to such a system of the embodiment,
The following effects can be obtained. (1) The return pipe connecting the compressor and the exhaust port of the servo valve is provided with a low-pressure chamber as appropriate, so that the pressure ratio on the exhaust side of the servo valve does not become excessive, and therefore the flow resistance is small, and the system The controllability of the gas is improved, the gas compression power is reduced, and the economy is improved. (2) In the return pipe, a check valve and a first three-way valve for gas suction inserted downstream of the low-pressure chamber, a second three-way valve inserted in a downstream pipe of the compressor, and the low-pressure chamber. And a check valve inserted in the circulating pipe that connects to the compressor, it is possible to accumulate pressure in each of the high-pressure chamber and the low-pressure chamber with a single compressor, thus making the system compact and reducing equipment costs. Reduce and improve economics.

[0010]

In summary, according to the present invention, in a gas pressure servo system for supplying gas pressurized by a compressor and stored in a high pressure chamber to a gas pressure cylinder via a servo valve, an exhaust port of the servo valve is provided. A low-pressure chamber of an appropriate pressure inserted in a return pipe connecting the compressor and the compressor, a check valve and a first three-way valve for gas suction inserted downstream of the low-pressure chamber in the return pipe,
By providing a second three-way valve inserted in the downstream pipe of the compressor and a check valve inserted in the circulation pipe connecting the low-pressure chamber, the dynamic characteristics are good and the gas compression power is small. Therefore, the present invention is extremely useful in industry because it provides a gas pressure servo system having excellent controllability and economy.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a system diagram showing a known gas pressure servo system.

[Explanation of symbols]

 1 return pipe 2 low pressure chamber 3 relief valve 4 check valve 5 three-way valve 6 three-way valve 7 check valve 8 circulation pipe 9 arrow 10 arrow 01 air 02 compressor 03 check valve 03a pipe 04 relief valve 05 high-pressure chamber 06 pipe 07 supply air 08 Exhaust port 09 Load port 010 Load port 011 Servo valve 012 Gas pressure cylinder 013 Load

Claims (1)

(57) [Scope of request for utility model registration] In a gas pressure servo system for supplying gas pressurized by a compressor and stored in a high pressure chamber to a gas pressure cylinder via a servo valve, an exhaust port of the servo valve is connected to the compressor. A low-pressure chamber inserted at an appropriate pressure inserted into the return pipe, a check valve and a first three-way valve for gas suction inserted downstream of the low-pressure chamber in the return pipe, and inserted into a downstream pipe of the compressor. And a check valve inserted in a circulation pipe connecting the second three-way valve and the low-pressure chamber.