WO2018179190A1

WO2018179190A1 - Liquid-feed type gas compressor

Info

Publication number: WO2018179190A1
Application number: PCT/JP2017/013105
Authority: WO
Inventors: 謙次森田
Original assignee: 株式会社日立産機システム
Priority date: 2017-03-29
Filing date: 2017-03-29
Publication date: 2018-10-04
Also published as: EP3604808A1; US20200102950A1; EP3604808B1; JP6742509B2; WO2018181299A1; JPWO2018181299A1; TW201837311A; CN110462213B; EP3604808A4; TWI671467B; CN110462213A

Abstract

Provided is a liquid-feed type gas compressor capable of monitoring the liquid surface height inside a gas-liquid separator. The liquid-feed type gas compressor comprises: an oil separator 4 that separates and stores oil from compressed air discharged from a compressor main body 1; a sampling pipe 19 having the inlet side thereof connected to the oil separator 4 at a prescribed height position and causing fluid to flow from the prescribed height position of the oil separator 4 as a result of the pressure difference between the inlet side and the outlet side; a pressure sensor 20 that detects the pressure of fluid that flows through the sampling pipe 19; a control device 7 that determines whether the fluid that flows through the sampling pipe 19 is oil or gas, by determining whether or not the pressure detected by the pressure sensor 20 rises above a set value P1 or falls below a set value P2; and a display device 8 that makes notification of the determination results from the control device 7.

Description

Liquid supply type gas compressor

The present invention relates to a liquid supply type gas compressor provided with a gas / liquid separator, and more particularly to a liquid supply type gas compressor suitable for monitoring the liquid level in the gas / liquid separator.

An oil supply type air compressor that is one of liquid supply type gas compressors includes a compressor body, an oil separator, and an oil supply system (see, for example, Patent Document 1). The compressor body compresses air (gas) while injecting oil (liquid) into the compression chamber for the purpose of cooling the compression heat, lubricating the rotor, and sealing the compression chamber. The oil separator (gas-liquid separator) separates and stores oil from compressed air (compressed gas) discharged from the compressor body. The oil supply system (liquid supply system) supplies the oil stored in the oil separator to the compressor body.

JP 2009-85045 A

In the above-described oil supply type air compressor, if the oil storage amount in the oil separator is insufficient, that is, if the oil supply amount to the compressor main body is insufficient, the compression performance and the like are deteriorated. Therefore, it is necessary to monitor the oil level in the oil separator.

Therefore, if the difference between the air pressure in the oil separator and the oil pressure is large, a method of providing a detector for detecting the pressure at a predetermined height position in the oil separator can be considered. More specifically, in this method, for example, a threshold value that is intermediate between the air pressure and the oil pressure in the oil separator is set in advance, and it is determined whether or not the pressure detected by the detector exceeds the threshold value. It is determined whether the fluid existing at a predetermined height in the oil separator is air or oil. Thereby, it is detected whether the oil level in the oil separator is lower than a predetermined height position.

Alternatively, if the difference between the temperature of the air in the oil separator and the temperature of the oil is large, a method of providing a detector for detecting the temperature at a predetermined height position in the oil separator can be considered. More specifically, in this method, for example, a threshold value that is intermediate between the temperature of the air in the oil separator and the temperature of the oil is set in advance, and by determining whether the temperature detected by the detector exceeds the threshold value, It is determined whether the fluid existing at a predetermined height in the oil separator is air or oil. Thereby, it is detected whether the oil level in the oil separator is lower than a predetermined height position.

However, in reality, there is almost no difference between the air pressure and the oil pressure in the oil separator, and there is almost no difference between the air temperature and the oil temperature. Therefore, even if the oil surface height in the oil separator does not fluctuate, the detection value of the detector does not fluctuate. Therefore, the method described above cannot be employed.

As another method, it is conceivable to provide an optical detector for detecting the presence or absence of oil at a predetermined height position in the oil separator. However, the oil separated from the compressed air flows down in the oil separator. Also, the oil level in the oil separator may swell. Therefore, even when the oil level in the oil separator is lower than the predetermined height position, the detector may erroneously detect because the oil continuously passes or adheres to the detector. Therefore, this method cannot be adopted.

The present invention has been made in view of the above matters, and an object of the present invention is to monitor the liquid level in the gas-liquid separator.

In order to solve the above problems, the configuration described in the claims is applied. The present invention includes a plurality of means for solving the above-mentioned problems. For example, a compressor main body that compresses gas while injecting a liquid into a compression chamber, and a discharge from the compressor main body. In a liquid supply type gas compressor comprising: a gas-liquid separator that separates and stores a liquid from the compressed gas; and a liquid supply system that supplies the liquid stored in the gas-liquid separator to the compressor body. An inlet side is connected to a predetermined height position of the gas-liquid separator, a sampling pipe for flowing a fluid from the predetermined height position of the gas-liquid separator by a pressure difference between the inlet side and the outlet side, and the sampling pipe A detector for detecting the pressure or temperature of the flowing fluid, a determination whether the pressure or temperature detected by the detector may exceed a preset first set value, and the detector The pressure or temperature is By performing at least one of the determinations as to whether or not the second set value that is set to be smaller than the set value of 1 may be less, the fluid flowing through the sampling pipe is either gas or liquid A control device that determines whether or not the control device and a notification device that notifies the determination result of the control device.

In the present invention, when a liquid is supplied to the sampling pipe, the pressure or temperature of the liquid hardly pulsates (in other words, a large change that periodically increases and decreases), but when a gas is supplied to the sampling pipe, It is based on the knowledge that pulsation occurs in the pressure or temperature of gas, and it can be determined whether the fluid flowing through the sampling pipe is gas or liquid. Thereby, the liquid level height in the gas-liquid separator can be monitored.

In addition, problems, configurations and effects other than the above will be clarified by the following explanation.

It is the schematic showing the structure of the oil supply type air compressor in the 1st Embodiment of this invention, and shows the state with which the oil storage amount in an oil separator is satisfied. It is a figure which shows the state in which the oil storage amount in the oil separator in the 1st Embodiment of this invention is insufficient. It is a figure showing the time-dependent change of the detected value of the pressure sensor in the 1st Embodiment of this invention, and shows the case where oil flows into sampling piping. It is a figure showing the time-dependent change of the detected value of the pressure sensor in the 1st Embodiment of this invention, and shows the case where air flows into sampling piping. It is the schematic showing the structure of the oil supply type air compressor in the 2nd Embodiment of this invention, and shows the state with which the oil storage amount in an oil separator is satisfied. It is a figure which shows the state in which the oil storage amount in the oil separator in the 2nd Embodiment of this invention is insufficient. It is a figure showing the time-dependent change of the detected value of the temperature sensor in the 2nd Embodiment of this invention, and shows the case where oil flows into sampling piping. It is a figure showing the time-dependent change of the detected value of the temperature sensor in the 2nd Embodiment of this invention, and shows the case where air flows into sampling piping. It is the schematic showing the communication terminal in the modification of this invention.

Referring to the drawings, a first embodiment of the present invention will be described by taking an oil supply type air compressor as an example to which the present invention is applied.

FIG. 1 is a schematic diagram showing the configuration of an oil supply type air compressor in the present embodiment, and shows a state where the amount of oil stored in the oil separator is satisfied. FIG. 2 is a diagram illustrating a state where the amount of oil stored in the oil separator in the present embodiment is insufficient.

The oil supply type air compressor of this embodiment includes a compressor main body 1, a suction system 2 connected to the suction side of the compressor main body 1, and oil connected to the discharge side of the compressor main body 1 via a discharge pipe 3. The separator 4 (gas-liquid separator), the compressed air supply system 5 (compressed gas supply system) connected to the upper part of the oil separator 4, and the lower part of the oil separator 4 and the compressor body 1 are connected. An oil supply system 6 (liquid supply system), a control device 7 and a display device 8 are provided. The compressor body 1, the suction system 2, the discharge pipe 3, the oil separator 4, the compressed air supply system 5, the oil supply system 6, the control device 7, and the display device 8 are included in a package-type compressor unit 9. It is installed.

Although not shown in detail, the compressor body 1 has a pair of male and female screw rotors that mesh with each other and a casing that houses them, and a plurality of compression chambers are formed in the tooth grooves of the screw rotor. When the screw rotor rotates, the compression chamber moves in the axial direction of the rotor. The compression chamber sucks air (gas) from the suction system 2, compresses the air, and discharges the compressed air (compressed gas) to the discharge pipe 3. The compressor body 1 is configured to inject oil (liquid) into the compression chamber immediately after the start of compression, for the purpose of cooling the compression heat, lubricating the rotor, and sealing the compression chamber, for example.

The suction system 2 includes a suction filter 10 that removes impurities in the air, and a suction throttle valve 11 that is provided on the downstream side of the suction filter 10 and can close the suction side of the compressor body 1.

The oil separator 4 separates oil from the compressed air discharged from the compressor body 1 by using, for example, specific gravity separation and collision separation, and stores the separated oil in the lower part. The compressed air separated by the oil separator 4 is supplied to a use destination outside the unit via a compressed air supply system 5. The compressed air supply system 5 is provided on the downstream side of the pressure regulating valve (check valve) 12, the pressure regulating valve 12, and is provided on the downstream side of the pressure regulating valve 12 for cooling the compressed air. And a control pressure sensor 14 that detects pressure (that is, pressure that varies depending on the amount of compressed air used). The control pressure sensor 14 outputs the detected pressure to the control device 7.

The oil stored in the oil separator 4 is supplied to the compression chamber via the oil supply system 6 due to the pressure difference between the oil separator 4 and the compression chamber of the compressor body 1. The oil supply system 6 includes an oil cooler 15 that cools oil, a bypass pipe 16 that bypasses the oil cooler 15, a temperature control valve (three-way valve) 17 that is provided at the inlet (branch point) of the bypass pipe 16, a bypass An oil filter 18 is provided on the downstream side of the outlet (junction point) of the pipe 16 and removes impurities in the oil. The temperature control valve 17 detects the temperature of the oil and adjusts the ratio of the flow rate on the oil cooler 15 side and the flow rate on the bypass pipe 16 side according to the temperature of the oil. Thereby, the temperature of the oil supplied to the compressor body 1 is adjusted.

The control device 7 includes an arithmetic control unit (for example, CPU) that executes arithmetic processing and control processing based on a program, and a storage unit (for example, ROM, RAM) that stores the results of the program and arithmetic processing. As an operation control function, the control device 7 controls the open / close state of the suction throttle valve 11 according to the pressure detected by the control pressure sensor 14, thereby switching the operation state of the compressor body 1.

More specifically, the controller 7 unloads the pressure detected by the control pressure sensor 14 when the compressor main body 1 is loaded (in other words, when the suction throttle valve 11 is open). It is determined whether or not the pressure has increased until the starting pressure Pu is reached. When the pressure detected by the control pressure sensor 14 becomes the unload start pressure Pu, the suction throttle valve 11 is controlled to be closed, and the compressor main body 1 is switched to no-load operation.

When the compressor body 1 is in a no-load operation (in other words, when the suction throttle valve 11 is in a closed state), the control device 7 sets the pressure detected by the control pressure sensor 14 to a preset load return pressure Pd ( However, it is determined whether or not it has been lowered until Pd <Pu). Then, when the pressure detected by the control pressure sensor 14 becomes the load return pressure Pd, the suction throttle valve 11 is controlled to be in the open state, and the operation is switched to the load operation of the compressor body 1.

Here, as a major feature of the present embodiment, the oil supply type air compressor has a predetermined height position H of the oil separator 4 on the inlet side (specifically, for example, the height position of the oil level corresponding to a desired oil storage amount). ), The outlet side of which is connected to the upstream side of the oil filter 18 of the oil supply system 6, and a pressure sensor 20 (detector) for detecting the pressure of the fluid flowing through the sampling pipe 19. . For example, the sampling pipe 19 has a smaller cross-sectional area than the pipe of the oil supply system 6 so that the flow rate is smaller than that of the oil supply system 6. The pressure sensor 20 outputs the detected pressure to the control device 7.

The control device 7 functions as an oil level height detection function during the load operation of the compressor body 1 (in other words, when the oil level in the oil separator 4 is lower than during the no-load operation of the compressor body 1). Determination of whether or not the pressure detected by the pressure sensor 20 may be outside the preset setting range (in other words, whether or not the preset pressure P1 may be exceeded) Is determined to determine whether the fluid flowing through the sampling pipe 19 is air or oil, and the result of the determination is determined. Is output to the display device 8. The display device 8 notifies the determination result of the control device 7.

More specifically, as shown in FIG. 1, when the oil level in the oil separator 4 is higher than a predetermined height position H (in other words, the position where the inlet side of the sampling pipe 19 is connected), the sampling pipe 19 Oil flows. In this case, as shown in FIG. 3, the oil pressure detected by the pressure sensor 20 does not pulsate and is within the set range (in other words, the set value P1 or less and the set value P2 or more). Therefore, the control device 7 determines that the fluid flowing through the sampling pipe 19 is oil. Thereby, it can be detected that the oil level in the oil separator 4 is higher than the predetermined height position H.

On the other hand, as shown in FIG. 2, when the oil level in the oil separator 4 is lower than the predetermined height position H, air flows through the sampling pipe 19. In this case, as shown in FIG. 4, the pressure of the air detected by the pressure sensor 20 pulsates and falls outside the set range (in other words, exceeds the set value P1 or falls below the set value P2). . Therefore, the control device 7 determines that the fluid flowing through the sampling pipe 19 is air. Thereby, it can be detected that the oil level in the oil separator 4 is lower than the predetermined height position H.

When the determination result that the fluid flowing through the sampling pipe 19 is air is input, the display device 8 supplies, for example, “alarm: insufficient lubricating oil” or “alarm: lubricating oil” as information based on the determination result. Please display "message etc. Further, the display device 8 may input a determination result that the fluid flowing through the sampling pipe 19 is oil, and displays, for example, a “lubricating oil sufficient” message as information based on the determination result. Also good.

As described above, in the present embodiment, when oil (liquid) flows through the sampling pipe 19, pulsation hardly occurs in the oil pressure, but when air (gas) flows through the sampling pipe 19, This is based on the knowledge that pulsation occurs in the pressure, and it can be determined whether the fluid flowing through the sampling pipe 19 is oil or air. Thereby, the oil level height in the oil separator 4 can be monitored.

In the first embodiment, the control device 7 determines whether or not the pressure detected by the pressure sensor 20 may be outside the set range (in other words, the pressure detected by the pressure sensor 20 is the set value). It is determined whether the fluid flowing through the sampling pipe 19 is either air or oil by performing both determination of whether or not the value may exceed P1 and determination of whether or not the value may be lower than the set value P2. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention.

As a first modification, the control device 7 is one of the determination of whether the pressure detected by the pressure sensor 20 may exceed the set value P1 and the determination of whether the pressure may be below the set value P2. It may be determined whether the fluid flowing through the sampling pipe 19 is air or oil. Even in such a modification, the same effect as described above can be obtained.

As a second modification, the control device 7 determines whether the frequency at which the pressure detected by the pressure sensor 20 exceeds the set value P1 is greater than a predetermined value and the pressure detected by the pressure sensor 20 sets the set value P2. It may be determined whether the fluid flowing through the sampling pipe 19 is air or oil by performing one or both of determinations as to whether the frequency of lowering is greater than a predetermined value. Even in such a modification, the same effect as described above can be obtained.

As a third modification, the control device 7 calculates a rate of change in pressure detected by the pressure sensor 20 (specifically, for example, the rate of change of pressure obtained at each detection time interval of the pressure sensor 20). Sampling piping by performing one or both of determining whether the rate of change may exceed a preset positive set value and determining whether the rate of change may be below a preset negative set value It may be determined whether the fluid flowing to 19 is air or oil. Even in such a modification, the same effect as described above can be obtained.

A second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 5 is a schematic diagram showing the configuration of the oil supply type air compressor in the present embodiment, and shows a state where the oil storage amount in the oil separator 4 is satisfied. FIG. 6 is a diagram showing a state where the amount of oil stored in the oil separator 4 in the present embodiment is insufficient.

The oil supply type air compression of this embodiment includes a temperature sensor 21 (detector) that detects the temperature of the fluid flowing through the sampling pipe 19 in place of the pressure sensor 20. The temperature sensor 21 outputs the detected temperature to the control device 7A.

As a function of detecting the oil level, the control device 7A determines whether the temperature detected by the temperature sensor 21 may fall outside the preset setting range during the load operation of the compressor body 1 (in other words, Sampling by performing a determination as to whether or not the preset set value T1 may be exceeded and a preset set value T2 (however, whether or not the preset value T2 may be less than T1) may be sampled. It is determined whether the fluid flowing through the pipe 19 is air or oil, and the determination result is output to the display device 8.

More specifically, as shown in FIG. 5, when the oil level in the oil separator 4 is higher than a predetermined height position H, oil flows into the sampling pipe 19. In this case, as shown in FIG. 7, the temperature of the oil detected by the temperature sensor 21 does not pulsate and is within the set range (in other words, the set value T1 or less and the set value T2 or more). Therefore, the control device 7A determines that the fluid flowing through the sampling pipe 19 is oil. Thereby, it can be detected that the oil level in the oil separator 4 is higher than the predetermined height position H.

On the other hand, as shown in FIG. 6, when the oil level in the oil separator 4 is lower than the predetermined height position H, air flows through the sampling pipe 19. In this case, as shown in FIG. 8, the temperature of the air detected by the temperature sensor 21 pulsates and falls outside the set range (in other words, exceeds the set value T1 or falls below the set value T2). is there. Therefore, the control device 7A determines that the fluid flowing through the sampling pipe 19 is air. Thereby, it can be detected that the oil level in the oil separator 4 is lower than the predetermined height position H.

As described above, in the present embodiment, when oil (liquid) flows through the sampling pipe 19, pulsation hardly occurs in the temperature of the oil, but when air (gas) flows through the sampling pipe 19, This is based on the knowledge that pulsation occurs in temperature, and it can be determined whether the fluid flowing through the sampling pipe 19 is oil or air. Thereby, the oil level height in the oil separator 4 can be monitored.

In the second embodiment, the control device 7A determines whether or not the temperature detected by the temperature sensor 21 may be outside the set range (in other words, the temperature detected by the temperature sensor 21 is the set value). By determining whether or not the value may exceed T1 and whether or not the value may be below the set value T2, it is determined whether the fluid flowing through the sampling pipe 19 is air or oil. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention.

As a fourth modification, the control device 7A includes one of determination of whether the temperature detected by the temperature sensor 21 may exceed the set value T1 and determination of whether the temperature may be below the set value T2. It may be determined whether the fluid flowing through the sampling pipe 19 is air or oil. Even in such a modification, the same effect as described above can be obtained.

As a fifth modified example, the control device 7A determines whether or not the frequency detected by the temperature sensor 21 exceeds the set value T1 more frequently than the predetermined value, and the temperature detected by the temperature sensor 21 sets the set value T2. It may be determined whether the fluid flowing through the sampling pipe 19 is air or oil by performing one or both of determinations as to whether the frequency of lowering is greater than a predetermined value. Even in such a modification, the same effect as described above can be obtained.

As a sixth modification, the control device 7A calculates a rate of change in temperature detected by the temperature sensor 21 (specifically, for example, the rate of change of temperature obtained at each detection time interval of the temperature sensor 21). Sampling piping by performing one or both of determining whether the rate of change may exceed a preset positive set value and determining whether the rate of change may be below a preset negative set value It may be determined whether the fluid flowing to 19 is air or oil. Even in such a modification, the same effect as described above can be obtained.

In the first and second embodiments and the above-described modification, the notification device that notifies the determination result of the

control device

7 or 7A is mounted on the compressor unit 9 and is based on the determination result of the

control device

7 or 7A. Although the case where the display device 8 displays information has been described as an example, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention. As in the seventh modification shown in FIG. 9, for example, the notification device is separated from the compressor unit 9 and is based on the determination result (in detail, the

control device

7 or 7A received via the communication line 22). For example, the communication terminal 23 may display a message such as “alarm: insufficient lubricating oil” or “alarm: replenish lubricating oil”. Alternatively, although not shown, the notification device may be, for example, an alarm lamp or an alarm buzzer mounted on the compressor unit 9. And the

control apparatus

7 or 7A may drive an alarm lamp or an alarm buzzer, when it determines with the fluid which flows into the sampling piping 19 being air. In these modified examples, the same effect as described above can be obtained.

Further, in the first and second embodiments, the sampling pipe 19 has been described by taking the case where the outlet side is connected to the upstream side of the oil filter 18 of the oil supply system 6 as an example. However, the present invention is not limited to this. Modifications are possible without departing from the spirit and technical idea of the present invention. In other words, the sampling pipe is connected to a predetermined height position of the oil separator 4 on the inlet side, and from a predetermined height position of the oil separator 4 due to a pressure difference between the inlet side (high pressure side) and the outlet side (low pressure side). It suffices if it is configured to flow the fluid. Therefore, the part to which the outlet side of the sampling pipe is connected may be at a pressure lower than the pressure in the oil separator 4 by at least the pressure loss of the sampling pipe.

In the first and second embodiments, the oil supply type air compressor includes a suction throttle valve 11 that closes the suction side of the compressor body 1 in order to switch the compressor body 1 from the load operation to the no-load operation. The case where it is provided has been described as an example. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention.

In order to switch the compressor main body 1 from the load operation to the no-load operation, the oil supply type air compressor replaces the suction throttle valve 11 and discharges the compressor main body 1 (specifically, the adjustment of the compressed air supply system 5). An air release valve 24 (indicated by a dotted line in FIG. 1 or FIG. 5) for releasing air from the upstream side of the pressure valve 12 may be provided. Then, when the pressure detected by the control pressure sensor 14 becomes the unload start pressure Pu, the

control device

7 or 7A controls the air release valve 24 to be in an open state so that the compressor body 1 is not operated from the load operation. Switch to load operation. Further, when the pressure detected by the control pressure sensor 14 becomes the load return pressure Pd, the air release valve 24 is controlled to be closed, and the compressor body 1 is switched from the no-load operation to the load operation.

Alternatively, the oil supply type air compressor may be provided with both the suction throttle valve 11 and the discharge valve 24. Moreover, you may comprise the oil supply type air compressor so that the compressor main body 1 may not be switched from load operation to no-load operation. That is, the suction throttle valve 11 or the discharge valve 24 is not provided, and the

control device

7 or 7A may not have the above-described operation control function. In these modified examples, the same effect as described above can be obtained.

In addition, in the above, although the case where this invention was applied to the oil supply type air compressor was demonstrated as an example, it is not restricted to this. That is, for example, a compressor main body that compresses air (gas) while injecting water (liquid) into the compression chamber, and water separation that separates and stores water from the compressed air (compressed gas) discharged from the compressor main body Even if the present invention is applied to a water supply type air compressor provided with a separator (gas-liquid separator) and a water supply system (liquid supply system) for supplying water stored in the water separator to the compressor body Good. When the present invention is applied to this water supply type air compressor, the water surface height in the water separator can be monitored. Moreover, you may apply this invention to the compressor which compresses gas other than air.

DESCRIPTION OF SYMBOLS 1 ... Compressor body, 4 ... Oil separator (gas-liquid separator), 6 ... Oil supply system (liquid supply system), 7, 7A ... Control device, 8 ... Display device (notification device), 9 ... Compressor unit , 11 ... Suction throttle valve, 19 ... Sampling piping, 20 ... Pressure sensor (detector), 21 ... Temperature sensor (detector), 22 ... Communication line, 23 ... Communication terminal (notification device), 24 ... Air release valve

Claims

A compressor main body that compresses gas while injecting liquid into the compression chamber, a gas-liquid separator that separates and stores liquid from the compressed gas discharged from the compressor main body, and the gas-liquid separator. In a liquid supply type gas compressor provided with a liquid supply system for supplying liquid to the compressor body,
A sampling pipe connected at an inlet side to a predetermined height position of the gas-liquid separator, and for flowing a fluid from the predetermined height position of the gas-liquid separator by a pressure difference between the inlet side and the outlet side;
A detector for detecting the pressure or temperature of the fluid flowing through the sampling pipe;
Judgment whether the pressure or temperature detected by the detector may exceed a preset first set value and the pressure or temperature detected by the detector are smaller than the first set value in advance It is determined whether the fluid flowing through the sampling pipe is a gas or a liquid by performing at least one of the determinations as to whether or not the second set value may be set to be lower A control device;
A liquid supply type gas compressor comprising: a notification device that notifies a determination result of the control device.
The liquid supply type gas compressor according to claim 1,
The control device determines whether or not the pressure or temperature detected by the detector may exceed a preset first set value and the pressure or temperature detected by the detector in advance. It is determined whether the fluid flowing through the sampling pipe is a gas or a liquid by performing both of the determination as to whether or not the second setting value that is set to be smaller than the setting value may occur. A liquid supply type gas compressor characterized by:
The liquid supply type gas compressor according to claim 1,
In order to switch from the load operation of the compressor body to the no-load operation, at least one of a suction throttle valve that closes the suction side of the compressor body and an air discharge valve that discharges the discharge side of the compressor body Prepared,
The control device determines whether or not the pressure or temperature detected by the detector may exceed a preset first set value during the load operation of the compressor body, and is detected by the detector. By performing at least one of the determination as to whether the pressure or temperature may be lower than the second set value that is set in advance to be smaller than the first set value, the fluid flowing through the sampling pipe A liquid supply type gas compressor characterized by determining which of a gas and a liquid is used.
The liquid supply type gas compressor according to claim 1,
An outlet side of the sampling pipe is connected to the liquid supply system.
The liquid supply type gas compressor according to claim 1,
The compressor main body, the gas-liquid separator, and the liquid supply system are mounted on a compressor unit,
The informing device is a display device that is mounted on the compressor unit and displays information based on a determination result of the control device.
The liquid supply type gas compressor according to claim 1,
The compressor main body, the gas-liquid separator, and the liquid supply system are mounted on a compressor unit,
The liquid supply type gas compressor, wherein the notification device is a communication terminal that is separated from the compressor unit and displays information based on a determination result of the control device received via a communication line.
A compressor main body that compresses gas while injecting liquid into the compression chamber, a gas-liquid separator that separates and stores liquid from the compressed gas discharged from the compressor main body, and the gas-liquid separator. In a liquid supply type gas compressor provided with a liquid supply system for supplying liquid to the compressor body,
A sampling pipe connected at an inlet side to a predetermined height position of the gas-liquid separator, and for flowing a fluid from the predetermined height position of the gas-liquid separator by a pressure difference between the inlet side and the outlet side;
A detector for detecting the pressure or temperature of the fluid flowing through the sampling pipe;
It is determined whether the frequency at which the pressure or temperature detected by the detector exceeds a preset first set value is greater than a predetermined value, and the pressure or temperature detected by the detector is set in advance in the first setting. By performing at least one of the determination as to whether or not the frequency that falls below the second set value set to be smaller than the value is greater than the predetermined value, the fluid flowing through the sampling pipe is either gas or liquid A control device for determining whether or not
A liquid supply type gas compressor, comprising: a notification device that notifies a determination result of the control device.
A compressor main body that compresses gas while injecting liquid into the compression chamber, a gas-liquid separator that separates and stores liquid from the compressed gas discharged from the compressor main body, and the gas-liquid separator. In a liquid supply type gas compressor provided with a liquid supply system for supplying liquid to the compressor body,
A sampling pipe connected at an inlet side to a predetermined height position of the gas-liquid separator, and for flowing a fluid from the predetermined height position of the gas-liquid separator by a pressure difference between the inlet side and the outlet side;
A detector for detecting the pressure or temperature of the fluid flowing through the sampling pipe;
Calculate the rate of change in pressure or temperature detected by the detector, determine whether the rate of change may exceed a preset positive set value, and set a negative set value where the rate of change is preset A control device for determining whether the fluid flowing in the sampling pipe is a gas or a liquid by performing at least one of the determination of whether or not the
A liquid supply type gas compressor comprising: a notification device that notifies a determination result of the control device.