JP2008291836A - Multi-stage gas compressing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-stage gas compressing apparatus capable of reducing cost, and capable of enhancing safety, by simplifying an operation control system. <P>SOLUTION: This multi-stage gas compressing apparatus has at least one sub-gas compressor 3 for compressing and boosting pressurized gas compressed and boosted by a main gas compressor 1 to further high pressure, and has a detector 4 detecting delivery pressure of the pressurized gas delivered from the sub-gas compressor 3, and a control device 7 capable of simultaneously controlling operation and stopping of both the main gas compressor 1 and the sub-gas compressor 3 based on this detector 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas multi-stage pressure boosting device that compresses and pressurizes pressurized gas in stages with a plurality of gas compressors, and in particular, a gas designed to simplify operation control in a main gas compressor and a sub gas compressor. The present invention relates to a multistage booster.

  As shown in FIG. 5, a conventional gas multistage pressure increasing device includes a low-pressure main gas compressor (for example, a scroll compressor) 101 that compresses and pressurizes pressurized gas, and a pressure that is compressed and pressurized by the scroll compressor 101. A high-pressure sub-gas compressor (a booster compressor, for example, a reciprocating compressor) 102 for further compressing and boosting the gas, and the high-pressure pressurized gas compressed and boosted by the sub-gas compressor 102 is stored in the storage tank 103. It can be stored.

  When controlling such an apparatus, both the gas compressors 101 and 102 are provided with pressure sensors 104 and 105 in which an upper limit pressure and a lower limit pressure are set, and discharges detected by the pressure sensors 104 and 105 are detected. Based on the upper limit pressure or the lower limit pressure, the main gas compressor 101 and the sub gas compressor 102 are independently controlled to operate and stop with the respective control devices 106 and 107.

However, in order to control each gas compressor 101 and 102 independently, the said gas multistage pressure | voltage rise apparatus requires the two pressure sensors 104 and 105 and the control apparatuses 106 and 107, and the main gas compressor 101 It is necessary to adjust the load by providing an intermediate receiver tank 108 in the piping system between the secondary gas compressor 102 and the secondary gas compressor 102.
That is, when the main gas compressor 101 is stopped, only the sub gas compressor 102 is operated, so that there is a risk that the sub gas compressor 102 is heavily loaded and damaged.
On the other hand, when the sub gas compressor 102 is stopped, only the main gas compressor 101 is operated, so that there is a risk that the main gas compressor 101 is heavily loaded and damaged.
This not only complicates the entire apparatus but also increases the cost.

  An object of the present invention is to provide a gas multistage booster that can simplify the operation control system, reduce the cost, and increase the safety in view of the above-described present situation. .

The above-described problems are solved by the invention having the following configuration, as described in each claim in the section “Claims”.
(1) A gas multistage booster according to the present invention includes a main gas compressor that compresses gas,
A sub-gas compressor that is connected to the main gas compressor via a pipe and further compresses the gas compressed by the main gas compressor;
A storage tank connected to the sub-gas compressor and storing gas further compressed by the sub-gas compressor;
A detector connected to the storage tank for detecting a first upper limit specified pressure or a first lower limit specified pressure of a gas in the storage tank and generating a signal;
A control device connected to the detector, the main gas compressor and the sub gas compressor, and starting and stopping the main gas compressor and the sub gas compressor according to a signal sent from the detector; I have.

  (2) In the above item (1), the detector is a first pressure sensor.

(3) In the above item (1), a relief valve is provided in a pipe between the main gas compressor and the sub gas compressor, and the main gas compressor is discharged when the sub gas compressor does not operate. When the pressure exceeds the second upper limit specified pressure which is lower than the first lower limit specified pressure, the compressed gas is released through the relief valve.

  (4) In the above item (1), an intermediate control device is provided in a pipe between the main gas compressor and the sub gas compressor, and the intermediate control device includes a second pressure sensor and a microcomputer circuit. If the second pressure sensor detects the second upper limit specified pressure of the gas flowing through the pipe that is lower than the first lower limit specified pressure when the gas compressor does not operate, the main gas compressor is stopped by the microcomputer circuit. .

  (5) In the above item (1), an intermediate control device is provided in a pipe between the main gas compressor and the sub gas compressor, and the intermediate control device includes a second pressure sensor and a microcomputer circuit. If the second pressure sensor detects a second lower limit specified pressure of the gas flowing through the pipe that is lower than the first lower limit specified pressure when the gas compressor does not operate, the sub gas compressor is stopped by the microcomputer circuit.

According to the present invention, the following effects can be achieved.
According to the invention of claim 1, since the operation control of both the main gas compressor and the sub gas compressor can be performed simultaneously by detecting the discharge pressure in the sub gas compressor, one pressure sensor, One operation control device with one control device can be provided, so that the operation control system can be simplified and the cost can be reduced.
In addition, since the main gas compressor and the sub gas compressor are operated or stopped at the same time, the intermediate pressure between the main gas compressor and the sub gas compressor can always be kept constant. There are no fluctuations and no temperature changes, which can improve safety and improve the service life.

  According to the second aspect of the present invention, since the pressure sensor is provided, detection is facilitated.

According to the invention described in claim 3, the discharge pressure of the pressurized gas in the main gas compressor is regulated to the specified pressure in the piping system between the main gas compressor and the sub gas compressor when the sub gas compressor is stopped. Since the relief valve is provided to discharge the pressurized gas to the outside when the pressure rises further, damage to the main gas compressor can be effectively prevented.

  According to invention of Claim 4, the intermediate control apparatus which consists of a pressure sensor and a microcomputer circuit is provided in the piping system between a main gas compressor and a sub gas compressor, and this sub control apparatus of a sub gas compressor is provided with this intermediate control apparatus. Since the main gas compressor can be stopped when the upper limit specified pressure is reached along with the stop, the main gas compressor can be effectively prevented from being damaged.

  According to the invention described in claim 5, an intermediate control device comprising a pressure sensor and a microcomputer circuit is provided in the piping system between the main gas compressor and the sub gas compressor, and this intermediate control device allows the main gas compressor to be Since the sub-gas compressor can be stopped when the lower limit specified pressure is reached along with the stop, the sub-gas compressor can be effectively prevented from being damaged.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram schematically showing a gas multistage booster according to a first embodiment of the present invention.

As shown in FIG. 1, the gas multistage pressure booster of the present invention includes a main gas compressor 1 composed of a low-pressure scroll compressor that compresses and pressurizes pressurized gas, and pressurization compressed and pressurized by the main gas compressor 1. And a sub-gas compressor 3 composed of a high-pressure reciprocating compressor connected to the pipe 2 by further compressing and boosting the gas.
The high-pressure pressurized gas compressed and pressurized by the auxiliary gas compressor 3 can be stored in the storage tank 5 connected by the pipe 4.

The storage tank 5 is provided with a pressure sensor 6 that detects the discharge pressure of the high-pressure pressurized gas that has been compressed and pressurized by the sub-gas compressor 3, and this pressure sensor 6 is OFF at an upper limit specified pressure of 1.0 MPa, for example. It is set to be ON at the lower limit specified pressure of 0.8 MPa.
When the pressure sensor 6 detects the upper limit specified pressure, the control device 7 that has received the OFF signal sends a stop signal to the main gas compressor 1 and the sub gas compressor 3 to stop them simultaneously.
The air in the storage tank 5 is consumed and the pressure sensor 6 detects the lower limit specified pressure. An ON signal is sent from the pressure sensor 6 to the control device 7, and a start signal is sent to the main gas compressor 1 and the sub gas compressor 3 to start them simultaneously.

  FIG. 2 is a block diagram schematically showing a gas multistage booster according to a second embodiment of the present invention.

  A relief valve 11 is provided in the pipe 10 between the main gas compressor 8 and the sub gas compressor 9. If the secondary gas compressor 9 fails, the main gas compressor 8 must compress the gas to approximately the same pressure that the secondary gas compressor 9 can do. Therefore, the main gas compressor 8 is overloaded and damaged. In order to avoid such a state, when the gas pressure reaches an upper limit specified pressure such as 0.75 MPa, the gas flowing through the pipe 10 opens the relief valve 11 and is released to the outside air.

  In the third embodiment of the present invention shown in FIG. 3, an upper limit composed of a pressure sensor 13 and a microcomputer control circuit 14 is used instead of the relief valve 11 in the piping system of the main gas compressor 8 and the sub gas compressor 9. And an intermediate control device 12 in which a specified lower limit pressure is set. Instead of the pressure sensor 13, a pressure switch may be provided. The pressure sensor 13 detects the pressure of the gas flowing through the pipe 10 and activates the microcomputer circuit 14 electrically connected to the pressure sensor 13.

  In FIG. 3, when the sub gas compressor 9 fails, the main gas compressor 8 compresses the gas to the same extent as the sub gas compressor 9 performs compression. The main gas compressor 8 is overloaded and damaged. In order to avoid such a state, when the pressure sensor 13 detects an upper limit specified pressure such as 0.75 MPa, the microcomputer circuit 14 issues a signal to the main gas compressor 8 to stop it.

In FIG. 4, when the main gas compressor 8 fails, an excessive load is applied to the sub gas compressor 9 and it is damaged. In order to avoid such a state, when the pressure sensor 13 detects a lower limit specified pressure such as 0.5 MPa, the microcomputer circuit 14 issues a signal to the sub gas compressor 9 to stop it.

  The range between the upper limit specified pressure and the lower limit specified pressure detected by the relief valve 11 or the intermediate control device 12 is between the upper limit specified pressure and the lower limit specified pressure detected by the pressure sensor 5 attached to the storage tank 6. It is set to be lower than the range. Otherwise, there is a high possibility that either the main gas compressor or the sub gas compressor will fail.

  The above description merely shows the embodiment of the present invention, and various changes and modifications can be made by those skilled in the art without departing from the scope of the claims.

1 is a block diagram schematically showing a gas multistage booster in a first embodiment of the present invention. It is a block diagram which shows 2nd Embodiment of this invention roughly. FIG. 4 is a block diagram when the main gas compressor is operating, according to a third embodiment of the present invention. FIG. 6 is a block diagram when the main gas compressor is not operating, according to the third embodiment of the present invention. It is a block diagram which shows the conventional gas multistage pressure | voltage rise apparatus roughly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main gas compressor 2 Piping 3 Subgas compressor 4 Piping 5 Storage tank 6 Pressure sensor 7 Control equipment 8 Main gas compressor 9 Subgas compressor 10 Piping 11 Relief valve 12 Intermediate control device 13 Pressure sensor 14 Microcomputer circuit

Claims (5)

A main gas compressor for compressing the gas;
A sub-gas compressor that is connected to the main gas compressor via a pipe and further compresses the gas compressed by the main gas compressor;
A storage tank connected to the sub-gas compressor and storing gas further compressed by the sub-gas compressor;
A detector connected to the storage tank for detecting a first upper limit specified pressure or a first lower limit specified pressure of a gas in the storage tank and generating a signal;
A control device connected to the detector, the main gas compressor and the sub gas compressor, and simultaneously starting and stopping the main gas compressor and the sub gas compressor by a signal sent from the detector; A multistage gas pressure booster.   The gas multistage booster according to claim 1, wherein the detector is a first pressure sensor. A pipe between the main gas compressor and the sub gas compressor is provided with a relief valve, and when the sub gas compressor does not operate, the discharge pressure from the main gas compressor is higher than the first lower limit specified pressure. The gas multistage pressure | voltage rise apparatus of Claim 1 in which compressed gas is discharged | emitted via the said relief valve when the low 2nd upper limit regulation pressure is exceeded.   An intermediate control device is provided in a pipe between the main gas compressor and the sub gas compressor, and the intermediate control device includes a second pressure sensor and a microcomputer circuit, and when the sub gas compressor does not operate, 2. The gas multistage booster according to claim 1, wherein the main gas compressor is stopped by the microcomputer circuit when the second pressure sensor detects a second upper limit specified pressure of the gas flowing through the pipe that is lower than the first lower limit specified pressure.     An intermediate control device is provided in a pipe between the main gas compressor and the sub gas compressor, and this intermediate control device is composed of a second pressure sensor and a microcomputer circuit. When the main gas compressor does not operate, the first control device is provided. 2. The gas multistage boost according to claim 1, wherein when the second pressure sensor detects a pressure lower than the lower limit specified pressure and lower than the second lower limit specified pressure of the gas flowing through the pipe, the sub-gas compressor is stopped by the microcomputer circuit. apparatus.

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