JP2019073977A - Compressed air supply system, control system for compressed air supply system and control method for compressed air supply system - Google Patents

Abstract

To provide a compressed air supply system which provides an opportunity to timely detect abnormality such as air leakage from an air tank or piping and reduction in a discharge pressure of a compressor, a control system for the compressed air supply system and a control method for the compressed air supply system.SOLUTION: The present invention relates to a compressed air supply system comprising: a compressor; an air tank which is connected with the compressor by piping and in which compressed air from the compressor is held; and a control part by which operation of the compressor is started when a pressure in the air tank is reduced to a lower limit pressure, the operation of the compressor is stopped when the pressure in the air tank rises to an upper limit pressure, and a warning is issued in a case where an operation time from the operation start of the compressor to the operation stop of the compressor is equal to or longer than a discrimination time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressed air supply system, a control system of the compressed air supply system, and a control method of the compressed air supply system.

  Conventionally, in a compressed air supply system that supplies compressed air for starting an engine, operation control of a compressor that supplies compressed air to the air tank of the compressed air supply system is performed by detecting the air pressure of the air tank. It is For example, control is performed to start the operation of the compressor when the pressure in the air tank decreases to the lower limit pressure, and to stop the operation of the compressor when the pressure in the air tank increases to the upper limit pressure.

  In such a compressed air supply system, in order to prevent waste of energy and to reduce the risk of being unable to start the engine, etc., the discharge pressure drop of the compressor due to abnormal air leakage from the air tank or piping, age deterioration, etc. It is important to detect the problem, and it has conventionally been dealt with by performing regular maintenance by people.

Patent Document 1 discloses, for example, a configuration that outputs “fault information” when the discharge temperature deviates from a preset temperature range. Further, in the document, the discharge pressure of the compressor is detected by a discharge pressure sensor, the presence or absence of an abnormality sign is determined based on a change rate such as suction temperature, and the duration time of unloading operation of the compressor is predetermined. There is disclosed a configuration in which information prompting maintenance is transmitted to the user PC when the period during which operation is stopped due to exceeding the value is equal to or longer than a predetermined period. The same matter is disclosed in Patent Document 2 as well.
Patent Document 3 discloses a monitoring control system such as a compressor.

Unexamined-Japanese-Patent No. 2014-10685 gazette International Publication WO2014 / 003178A1 Unexamined-Japanese-Patent No. 2015-108887

  However, in the configurations disclosed in Patent Documents 1 to 3, there is insufficient opportunity to detect an abnormality of air leakage from an air tank, piping, etc. in a timely manner. Moreover, in order to detect the fall of the discharge pressure of a compressor, it becomes necessary to provide apparatuses, such as a discharge pressure sensor, and cost is increased.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a compressed air supply system, a control system for compressed air supply system, and compressed air supply which solve at least one of these problems. It is providing a control method of a system.

  According to one aspect of the present invention, when the pressure in the air tank is reduced to the lower limit pressure, the air tank connected by the compressor and the compressor and the piping and holding the compressed air from the compressor The operation of the compressor is started, and when the pressure in the air tank rises to the upper limit pressure, the operation of the compressor is stopped, and the operation time from the start of the operation of the compressor to the stop of the operation of the compressor is And a control unit that issues an alarm if the determination time is longer than the determination time.

  The determination time is set based on the time required for the pressure in the air tank to increase from the lower limit pressure to the upper limit pressure when there is no abnormality in the compressor, the pipe, and the air tank. Is desirable.

  Further, it is preferable that the alarm be an alarm at a level corresponding to the operation time.

  Further, the control unit is configured to execute at least one of the operation stop of the compressor and the issuance of an emergency alarm when the operation time of the compressor reaches a limit time before the operation stop of the compressor. Is desirable.

  According to another aspect of the present invention, a control system for controlling a compressed air supply system comprising: a compressor; and an air tank connected to the compressor and piping and holding compressed air from the compressor Operation of the compressor is started when the pressure in the air tank falls to the lower limit pressure, and operation of the compressor is stopped when the pressure in the air tank rises to the upper limit pressure, and A control system of a compressed air supply system is provided, including a control unit that issues an alarm if the operation time from the start of operation to the operation stop of the compressor is equal to or longer than the determination time.

  According to another aspect of the present invention, there is provided a control method of controlling a compressed air supply system comprising: a compressor; and an air tank connected to the compressor and piping and holding compressed air from the compressor. Operation of the compressor is started when the pressure in the air tank falls to the lower limit pressure, and operation of the compressor is stopped when the pressure in the air tank rises to the upper limit pressure, and A control method of a compressed air supply system is provided, which issues an alarm when the operation time from the start of operation to the operation stop of the compressor is equal to or longer than the determination time.

  An opportunity is provided to detect anomalies in a timely manner.

The schematic block diagram of a compressed air supply system. An example of the table which matched the judgment time, the limit time, and the driving | operation time which were set to the process part 12, and a warning level. The flowchart which shows an example of the processing operation of a compressed air supply system.

  Hereinafter, embodiments according to the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic block diagram of a compressed air supply system. The compressed air supply system supplies compressed air to a compressed air supply target, and in the following, the compressed air supply target is an engine for driving a drainage pump installed in a drainage station (a drainage pump engine 1) I assume.

  The compressed air supply system includes a compressor 2, an air tank 3, and a control unit 4, and supplies compressed air to the drainage pump engine 1.

  The compressor 2 and the air tank 3 are connected by a pipe 21, and it is desirable that the pipe 21 be provided with a check valve 21 a. Further, the drainage pump engine 1 is provided with a starting valve 1a, and the air tank 3 and the drainage pump engine 1 are connected by a pipe 22 via the starting valve 1a.

  The drainage pump engine 1 is provided with a start valve 1a. The start valve 1a is normally closed. When the start-up valve 1a is opened, the drainage pump engine 1 is configured to be started upon receiving the supply of compressed air from the air tank 3. The drainage pump engine 1 requires compressed air only when the drainage pump engine 1 is started. Therefore, the start valve 1a is opened only when the drainage pump engine 1 is started.

  The compressor 2 compresses air during operation. As a result, compressed air of about several MPa is transferred to the air tank 3 by the pipe 21. Naturally, energy is consumed while the compressor 2 is operating. Therefore, it is necessary to make the operating time of the compressor 2 as short as possible.

  The air tank 3 holds the compressed air supplied from the compressor 2 via the pipe 21. When the start-up valve 1 a of the drainage pump engine 1 is opened, the air tank 3 supplies compressed air to the drainage pump engine 1 through the pipe 22. While the engine 1 for drainage pumps starts by this, the pressure in the air tank 3 falls. In general, the compressor 2 can hold compressed air that can start the drainage pump engine 1 multiple times.

  The control unit 4 controls the operation / stop of the compressor 2 according to the pressure in the air tank 3 and issues an alarm as required. Specifically, the control unit 4 includes the pressure switch 11 and the processing unit 12. The pressure switch 11 and the processing unit 12 may be spatially separated.

The pressure switch 11 comprises a pressure sensor and a switch. The pressure switch 11 can set the lower limit pressure and the upper limit pressure, and the pressure sensor detects the pressure and turns on the switch when the pressure drops to the lower limit pressure and turns the switch off when the pressure rises to the upper limit pressure .
The pressure switch 11 in the present embodiment is arranged such that the pressure sensor detects the pressure in the air tank 3, and the switch is configured to switch the operation / stop of the compressor 2. More specifically, when the pressure sensor detects that the pressure in the air tank 3 has dropped to the lower limit pressure, the switch is turned on to start the operation of the compressor 2 and the pressure in the air tank 3 rises to the upper limit pressure When the pressure sensor detects that it has done, the switch is turned off to stop the operation of the compressor 2. The pressure sensor and the switch may be operated mechanically or electrically.
The lower limit pressure is preset based on the pressure required for starting the drainage pump engine 1 and the like. The upper limit pressure is preset based on the pressure resistance of the air tank 3 and the like.

  The processing unit 12 is configured to detect ON (start of operation of the compressor 2) and OFF (stop of operation of the compressor 2) of the switch in the pressure switch 11. Note that, instead of the processing unit 12 detecting the on (start of operation of the compressor 2) and the off (stop of operation of the compressor 2) of the switch in the pressure switch 11, the processing unit 12 directly detects The driving situation may be monitored.

  The processing unit 12 can set a table in which the determination time, the limit time, the operation time, and the alarm level are associated. The processing unit 12 detects the start of the operation of the compressor 2 and the stop of the operation of the compressor 2 and measures the operation time from the start of the operation of the compressor 2 to the stop of the operation of the compressor 2. When the operating time is equal to or longer than the determination time, the processing unit 12 issues an alarm.

  When issuing the alarm, the processing unit 12 is configured to issue an alarm of the alarm level corresponding to the measured operation time with reference to a table in which the operation time and the alarm level are associated. It is desirable that the processing unit 12 issue a highly urgent alert if the alert level is high.

  The processing unit 12 stops the operation of the compressor 2 and issues an emergency alert when the operation time of the compressor 2 reaches the limit time before the operation of the compressor 2 is stopped. The emergency alert may be the same as the alert, but a more urgent alert is desirable.

  In addition, there is no restriction | limiting in particular in the aspect of the warning from the process part 12, For example, you may notify to the terminal which an operator and an operator which have a distant place via networks, such as the internet. Such an alarm makes it possible to early recognize that some abnormality has occurred.

  FIG. 2 illustrates an example of a table in which the determination time, the limit time, and the operation time set in the processing unit 12 are associated with the alarm level. In FIG. 2, the processing unit 12 associates the alarm level 1 with the operating time of 50 minutes or more and less than 70 minutes as the judgment time of 50 minutes as the judgment time, and the alarm level 2 of 70 minutes or more of operating time less than 100 minutes. Each table is set. As described above, in the table in which the driving time and the alarm level are associated with each other, it is preferable that the appropriate alarm level be set manually or automatically for the driving time which is not less than the judgment time and less than the limit time. There are no particular restrictions on the level of the alarm level, and only one level or three or more levels may be used.

Here, setting of a table in which the determination time, the limit time, the operation time, and the alarm level are associated will be described.
When an air leak from the air tank 3, piping 21 to 22 or the like is abnormal or the discharge pressure of the compressor 2 is reduced, the compressor 2 raises the pressure in the air tank 3 from the lower limit pressure to the upper limit pressure. It takes a long time to operate. As the degree of air leakage and the degree of decrease in discharge pressure increase, the operating time of the compressor 2 becomes longer. Therefore, the table in which the judgment time, the limit time and the operation time are associated with the alarm level is based on the operation time of the compressor 2 in the normal state of the compressor supply system, and an abnormality or discharge pressure decrease It is desirable to back calculate from the degree of and set appropriately.

  For example, in a compressed air supply system that supplies compressed air for starting the drainage pump engine 1 installed at a drainage station, the compressor supply system is in a normal state when it is only necessary to know the maintenance time. If the average of the operation time of 2 (that is, the operation time of the compressor 2 required for the pressure in the air tank 3 to increase from the lower limit pressure to the upper limit pressure) is about 40 minutes, the determination time is 50 minutes It is conceivable.

  As described above, the judgment time is slightly longer than the operation time of the compressor 2 required for the pressure in the air tank 3 to increase from the lower limit pressure to the upper limit pressure in the normal state of the compressor supply system. It is better to set the time as the limit time.

  FIG. 3 is a flowchart showing an example of the processing operation of the compressed air supply system. Note that, initially, the pressure in the air tank 3 is between the lower limit pressure and the upper limit pressure set in the pressure switch 11, and the compressor 2 is not in operation. In addition, it is assumed that the table in which the determination time, the limit time, the operation time, and the alarm level are associated with each other is set to the content shown in FIG.

  The pressure sensor in the pressure switch 11 monitors the pressure in the air tank 3 (step S1).

  When the pressure sensor in the pressure switch 11 detects that the pressure in the air tank 3 has decreased to the lower limit pressure (YES in step S2), the pressure switch 11 turns on the switch and starts the operation of the compressor 2. The processing unit 12 detects the start of the operation of the compressor 2 and starts measurement of the operation time (step S3). If the pressure sensor detects that the pressure in the air tank 3 has increased to the upper limit pressure (YES in step S5) while the operating time has not reached 100 minutes which is the limit time (YES in step S4), The pressure switch 11 turns off the switch to stop the operation of the compressor 2, and the processing unit 12 detects the stop of the operation of the compressor 2 and stops the measurement of the operation time (step S6).

  If the operation time is less than the determination time (NO in step S7), the processing unit 12 returns no alarm and the pressure sensor returns to the state of monitoring the pressure in the air tank 3 (step S1). The above is the compressor supply system processing operation in the normal state of the compressor supply system.

  If the operating time is equal to or longer than the determination time (YES in step S7), the processing unit 12 issues an alarm at a level according to the operating time (step S8). Specifically, the processing unit 12 refers to a table in which the operating time and the alarm level are associated, and when the measured operating time is 50 minutes or more and less than 70 minutes, issues a level 1 alarm and is measured. If the operation time is 70 minutes or more and less than 100 minutes, a level 2 alarm is issued. And a pressure sensor returns to the state which monitors the pressure in the air tank 3 (step S1).

  On the other hand, before detecting the stop of the operation of the compressor 2, the processing unit 12 issues an emergency alert when the operation time reaches 100 minutes which is the limit time (NO in step S4). The operation is stopped (step S9). The processing unit 12 may perform only one of the issuance of an emergency alert and the shutdown of the compressor 2.

  In the present embodiment, the operation time of the compressor 2 becomes longer if abnormality in air leakage from the air tank 3 or the pipes 21 to 22 or the like or a decrease in discharge pressure of the compressor 2 due to age deterioration occurs. It is possible to know that such an abnormality or aged deterioration has occurred by issuing an alarm, implement maintenance and repair in a timely manner, and detect and improve abnormal air leaks and aged deterioration. As a result, it is possible to suppress the waste of energy and to reduce the risk that the drainage pump engine can not be started.

  As described above, in the present embodiment, since an alarm is issued when the operation time of the compressor 2 becomes long, the discharge pressure of the compressor 2 due to the abnormality of the air leak from the air tank 3 or the pipes 21 to 22 or the aged deterioration. An opportunity is provided to detect drop anomalies in a timely manner. Further, in this embodiment, by issuing an alarm at a level according to the operation time, it becomes possible to grasp the degree of abnormality or aged deterioration, and it becomes possible to predict the emergency degree of maintenance or repair .

  Further, in the present embodiment, when the operation time of the compressor 2 reaches the limit time, an emergency alarm is issued and the operation of the compressor 2 is stopped, so that the unnecessary operation of the compressor 2 can be avoided. This makes it possible to grasp the need for emergency maintenance and repair, and to suppress the waste of energy due to the compressor 2 continuing to operate.

In the present embodiment, the pressure switch 11 is composed of a pressure sensor and a switch, but the switch is turned on when the pressure falls to the lower limit pressure, and the switch is turned off when the pressure rises to the upper limit pressure. A configuration may be adopted.
Further, in the present embodiment, the control unit 4 includes the pressure switch 11. However, instead of the pressure switch 11, the control unit 4 includes a pressure sensor for detecting the pressure in the air tank 3, and the control unit 4 When the pressure in the air tank 3 decreases to the lower limit pressure based on a signal indicating the pressure in the air tank 3, operation of the compressor 2 is started, and when the pressure in the air tank 3 increases to the upper pressure, The operation is stopped, and the operation time from the start of the operation of the compressor 2 to the stop of the operation of the compressor 2 is measured, and when the operation time is more than the determination time, an alarm of a level according to the operation time is issued. Or any other appropriate configuration may be adopted.

  In the present embodiment, the determination time and the limit time are set. However, only the limit time may be set. In this case, steps S7 and S8 in FIG. 3 may be omitted.

  All the embodiments described above are intended to enable those skilled in the art to which the present invention pertains to practice the present invention. Various modifications of the above-described embodiment can naturally be made by those skilled in the art, and the technical idea of the present invention can also be applied to other embodiments. Therefore, the present invention should not be limited to the described embodiments, but should be the broadest scope in accordance with the technical idea defined by the claims.

1 drain pump engine 1a start valve 2 compressor 3 air tank 4 control unit 11 pressure switch 12 processing unit 21-22 piping 21a check valve

Claims (6)

A compressor,
An air tank connected to the compressor by a pipe and holding compressed air from the compressor;
When the pressure in the air tank decreases to the lower limit pressure, the operation of the compressor is started, and when the pressure in the air tank increases to the upper limit pressure, the operation of the compressor is stopped, and the operation of the compressor starts. A control unit that issues an alarm if the operation time until the operation stop of the compressor is equal to or longer than the determination time;
A compressed air supply system comprising: The determination time is set based on the time required for the pressure in the air tank to increase from the lower limit pressure to the upper limit pressure when there is no abnormality in the compressor, the pipe, and the air tank.
The compressed air supply system according to claim 1. The alarm is an alarm at a level corresponding to the driving time.
The compressed air supply system according to claim 1 or 2. The control unit executes at least one of the operation stop of the compressor and the issuance of an emergency alarm when the operation time of the compressor reaches a limit time before the operation stop of the compressor.
The compressed air supply system according to any one of claims 1 to 3. A compressor,
An air tank connected to the compressor by a pipe and holding compressed air from the compressor;
A control system for controlling a compressed air supply system comprising:
When the pressure in the air tank decreases to the lower limit pressure, the operation of the compressor is started, and when the pressure in the air tank increases to the upper limit pressure, the operation of the compressor is stopped, and the operation of the compressor starts. A control unit is provided that issues an alarm if the operation time until the operation stop of the compressor is equal to or longer than the determination time.
Control system of compressed air supply system. A compressor,
An air tank connected to the compressor by a pipe and holding compressed air from the compressor;
A control method for controlling a compressed air supply system comprising:
When the pressure in the air tank decreases to the lower limit pressure, the operation of the compressor is started, and when the pressure in the air tank increases to the upper limit pressure, the operation of the compressor is stopped, and the operation of the compressor starts. An alarm is issued if the operation time until the operation stop of the compressor is equal to or more than the determination time,
Control method of compressed air supply system.