WO2018181299A1 - Liquid-feed type gas compressor - Google Patents

Liquid-feed type gas compressor Download PDF

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Publication number
WO2018181299A1
WO2018181299A1 PCT/JP2018/012412 JP2018012412W WO2018181299A1 WO 2018181299 A1 WO2018181299 A1 WO 2018181299A1 JP 2018012412 W JP2018012412 W JP 2018012412W WO 2018181299 A1 WO2018181299 A1 WO 2018181299A1
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WO
WIPO (PCT)
Prior art keywords
compressor
liquid
gas
liquid supply
pressure
Prior art date
Application number
PCT/JP2018/012412
Other languages
French (fr)
Japanese (ja)
Inventor
謙次 森田
Original Assignee
株式会社日立産機システム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Priority to US16/495,866 priority Critical patent/US20200102950A1/en
Priority to EP18777716.4A priority patent/EP3604808B1/en
Priority to JP2019509881A priority patent/JP6742509B2/en
Priority to CN201880019657.9A priority patent/CN110462213B/en
Publication of WO2018181299A1 publication Critical patent/WO2018181299A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0207—Lubrication with lubrication control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/021—Control systems for the circulation of the lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/24—Level of liquid, e.g. lubricant or cooling liquid

Definitions

  • 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 main body compresses air (gas) while injecting oil (liquid) into the compression chamber for the purpose of cooling compression heat, lubricating a compression member such as a rotor and a wrap, and sealing the compression chamber.
  • the oil separator gas-liquid separator
  • the oil supply system liquid supply system
  • 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.
  • 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.
  • an optical detector for detecting the presence or absence of oil at a predetermined height position in the oil separator.
  • the oil separated from the compressed air flows down in the oil separator.
  • 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.
  • the present invention includes a plurality of means for solving the above-mentioned problems.
  • a compressor main body that compresses gas while injecting a liquid into a compression chamber, and a discharge from the compressor main body.
  • 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.
  • 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
  • the liquid supply type gas compressor comprising a liquid supply system for supplying 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 a predetermined height position of the gas-liquid separator due to a pressure difference between the inlet side and the outlet side, and a downstream system connected to the outlet side of the sampling pipe on the liquid supply system A detector for detecting the pressure or temperature of the fluid flowing above, and determining whether or not the pressure or temperature detected by the detector may exceed a first preset value and detecting by the detector Pressure or temperature previously By performing at least one of the determination as to whether or not the second set value that is set to be smaller than the first set value may be reduced, the fluid flowing through the sampling pipe is out of gas and liquid.
  • 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.
  • 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
  • An oil supply system 6 liquid supply system
  • 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 the same base (base, pallet or tank).
  • the compressor unit 9 is configured by placing it on an air tank or the like.
  • the compressor unit 9 is configured as a casing having a peripheral surface and an upper surface surrounded by a panel plate.
  • 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.
  • 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 at any stage of the compression process, for example, immediately after the start of compression. It has become.
  • 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 disposed on the downstream side of the pressure regulating valve (check valve) 12, the pressure regulating valve 12, and cools the compressed air, and is disposed on the downstream side of the pressure regulating valve 12.
  • a control pressure sensor 14 that detects the pressure of the air (that is, the 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
  • the oil filter 18 is disposed downstream of the outlet (confluence) 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 in cooperation with a program, and a storage unit (for example, ROM, RAM) that stores the results of the program and arithmetic processing. is there.
  • arithmetic control unit for example, CPU
  • ROM read-only memory
  • RAM random access memory
  • 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. Then, 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.
  • 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 switched to the load operation of the compressor body 1. With the above operation switching, when the amount of compressed air used is reduced, the power consumption can be reduced.
  • the oil supply type air compressor has an inlet side corresponding to a predetermined height position H of the oil separator 4 (specifically, for example, a desired oil storage amount when the compressor is driven).
  • a sampling pipe 19 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. ).
  • 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, but the present invention is not limited to this.
  • 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) By determining whether the fluid flowing through the sampling pipe 19 is air or oil (or which is main). The determination is made, and the determination result is output to the display device 8. The display device 8 notifies the determination result of the control device 7.
  • the sampling pipe 19 Oil flows.
  • 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.
  • the display device 8 uses, for example, “alarm: insufficient lubricating oil” or “alarm: lubricating oil” as notification information based on the determination result. Please replenish "message. 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. In addition, these alerting
  • reporting methods may be various modes which combined sound, vibration, or these.
  • 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). By determining whether or not the value may exceed P1 and determining whether or not the value may be less than the set value P2, the fluid flowing through the sampling pipe 19 may be either air or oil (or which is the main).
  • 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.
  • 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 (or which is the main). Even in such a modification, the same effect as described above can be obtained.
  • 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. Even if it determines whether the fluid which flows into sampling piping 19 is one of air and oil (or which is the main) by performing one or both of the judgment of whether the frequency which falls below is more than a predetermined value Good. Even in such a modification, the same effect as described above can be obtained.
  • 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 You may determine whether the fluid which flows to 19 is air (or which is main) among air and oil. Even in such a modification, the same effect as described above can be obtained.
  • FIG. 5 is a schematic diagram showing the configuration of the oil-filled compressor in the present embodiment.
  • the main difference in configuration from the first embodiment is that the sampling pipe 19A in the second embodiment has an outlet side connected to the upstream side of the temperature control valve 17 on the oil supply system 6.
  • the pressure sensor 20 is arranged on the oil supply system 6 downstream from the outlet of the sampling pipe 19A (in the present embodiment, downstream from the outlet of the bypass pipe 16). That is, the second embodiment is characterized in that not the pressure pulsation of the sampling pipe 19A but the pressure pulsation generated in the oil supply system 6 by the sampling pipe 19A is detected.
  • the sampling pipe 19A is changed as in the first embodiment. Air flows into the oil supply system 6 through the air supply system 6. That is, air, oil, or a mixed fluid thereof flows through the bypass pipe 16 and pressure pulsation occurs. This change in pulsation is detected by the pressure sensor 20 as in the first embodiment, and the control device can detect the height of the oil level.
  • connection structure of the sampling pipe 19A may be the same as that of the first embodiment. .
  • the same effects as those of the first embodiment and its modifications can be obtained.
  • the size of the sampling pipe 19A is reduced, and it is possible to expect effects such as simplification of the pipe configuration and reduction of member costs.
  • FIG. 6 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. 7 is a diagram illustrating 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.
  • 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.
  • 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.
  • 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.
  • 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 performing both the determination of whether or not T1 may be exceeded and the determination of whether or not the set value T2 may be exceeded, the fluid flowing through the sampling pipe 19 may be either air or oil (or which is the main).
  • 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.
  • 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 (or which is the main). Even in such a modification, the same effect as described above can be obtained.
  • 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. Even if it determines whether the fluid which flows into sampling piping 19 is one of air and oil (or which is the main) by performing one or both of the judgment of whether the frequency which falls below is more than a predetermined value Good. Even in such a modification, the same effect as described above can be obtained.
  • 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 You may determine whether the fluid which flows to 19 is air (or which is main) among air and oil. Even in such a modification, the same effect as described above can be obtained.
  • the configuration of the second embodiment (FIG. 5) can also be applied to the third embodiment. That is, even if the pressure sensor 20 according to the second embodiment is replaced with the temperature sensor 21 according to the third embodiment, the same effect as that of the third embodiment can be obtained.
  • 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.
  • 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.
  • the notification device is separated from the compressor unit 9 and is based on information (specifically, based on the determination result of the control device 7 or 7 ⁇ / b> A received via the communication line 22.
  • the communication terminal 23 may display a message such as “alarm: insufficient lubricating oil” or “alarm: replenish lubricating oil”.
  • the communication terminal 23 may be configured to physically contact the compressor unit 9 as long as the communication terminal 23 is configured to be separated as a communication connection configuration.
  • the communication terminal 23 may be placed or suspended in any place of the compressor unit 9 and temporarily fixed so as to be separated.
  • the determination function of the control device 7 or 7A is provided in an external arithmetic device (server or the like) connected via the communication line 22, and the determination result is externally transmitted.
  • the configuration may be such that the communication terminal 23 is notified from the arithmetic device via the communication line 22.
  • the communication terminal 23 may be configured to have the determination function of the control device 7 or 7A.
  • the notification device may be, for example, an alarm lamp or an alarm buzzer mounted on the compressor unit 9.
  • 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.
  • the sampling pipe 19 (19A) has been described by taking an example in which the outlet side is connected to the upstream side of the oil filter 18 of the oil supply system 6, but the present invention is not limited thereto. Modifications can be made without departing from the spirit and technical idea of the present invention. That is, the sampling pipe is connected to a predetermined height position of the oil separator 4 on the inlet side, and from the predetermined height position of the oil separator 4 by the pressure difference between the inlet side (high pressure side) and the outlet side (low pressure side). What is necessary is just to be comprised so that a fluid may flow. 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.
  • 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.
  • 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 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, FIG. 5, or FIG. 6) for releasing air from the pressure valve 12 may be provided.
  • 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.
  • the discharge valve 24 is controlled to be closed, and the compressor body 1 is switched from the no-load operation to the load operation.
  • the oil supply type air compressor may include both the suction throttle valve 11 and the discharge valve 24.
  • the oil supply type air compressor may be configured not to switch the compressor main body 1 from the load operation to the 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.
  • a compressor main body that compresses air (gas) while injecting water (liquid) into a compression chamber
  • a water separator that separates and stores water from compressed air (compressed gas) discharged from the compressor main body
  • the present invention may be applied to a water supply type air compressor including a gas-liquid separator) and a water supply system (liquid supply system) that supplies water stored in the water separator to the compressor body.
  • the present invention is applied to this water supply type air compressor, the water surface height in the water separator can be monitored.
  • the compression mechanism of a so-called twin screw rotor composed of male and female screw rotors has been described as an example, but the present invention is not limited thereto.
  • various compression mechanisms such as a positive displacement type and a turbo type can be applied.
  • the positive displacement type includes a rotary type and a reciprocating type
  • the rotary type includes single, twin and multi screw rotors, single and multi scroll wraps, a vane type and a claw type.
  • the reciprocating type includes single and multiple reciprocating types.
  • the compressor main body is not limited to a single unit configuration, and can be applied to a multi-stage configuration composed of combinations of the same format or different formats.
  • 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, 19A ... Sampling piping, 20 ... Pressure sensor (detector), 21 ... Temperature sensor (detector), 22 ... Communication line, 23 ... Communication terminal (notification device), 24 ... Air release valve

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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 that separates and stores oil from compressed air discharged from a compressor main body 1; a sampling pipe having the inlet side thereof connected at a prescribed height position of the oil separator and causing fluid to flow from the prescribed height of the oil separator as a result of the pressure difference between the inlet side and the outlet side thereof; a pressure sensor that detects the pressure of fluid that flows into or has flowed into the sampling pipe; a control device that determines whether the fluid that flows through the sampling pipe is oil or gas, by determining whether or not the pressure detected by the pressure sensor rises above a set value P1 or falls below a set value P2; and a notification device that makes notification of the determination results of the control device.

Description

給液式気体圧縮機Liquid supply type gas compressor
　本発明は、気液分離器を備えた給液式気体圧縮機に係わり、特に、気液分離器内の液面高さを監視するのに好適な給液式気体圧縮機に関する。 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.
　給液式気体圧縮機の一つである給油式空気圧縮機は、圧縮機本体、油分離器、及び油供給系統を備える（例えば特許文献１参照）。圧縮機本体は、圧縮熱の冷却、ロータやラップ等の圧縮部材の潤滑、及び圧縮室のシールなどを目的として圧縮室に油（液体）を注入しつつ、空気（気体）を圧縮する。油分離器（気液分離器）は、圧縮機本体から吐出された圧縮空気（圧縮気体）から油を分離して貯留する。油供給系統（液体供給系統）は、油分離器で貯留された油を圧縮機本体へ供給する。 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 main body compresses air (gas) while injecting oil (liquid) into the compression chamber for the purpose of cooling compression heat, lubricating a compression member such as a rotor and a wrap, 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.
特開２００９－８５０４５号公報JP 2009-85045 A
　上述した給油式空気圧縮機では、油分離器内の貯油量が欠乏すれば、即ち圧縮機本体への給油量が欠乏すれば、圧縮性能等が低下する。そのため、油分離器内の油面高さを監視する必要がある。 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 deteriorate. Therefore, it is necessary to monitor the oil level in the oil separator.
　そこで、仮に、油分離器内の空気の圧力と油の圧力の差異が大きいのであれば、油分離器内の所定の高さ位置に、圧力を検出する検出器を設ける方法が考えられる。詳しく説明すると、この方法では、例えば油分離器内の空気の圧力と油の圧力の中間となる閾値を予め設定し、検出器で検出された圧力が閾値を超えるかどうかを判定することにより、油分離器内の所定の高さ位置に存在する流体が空気及び油のうちのいずれであるかを判定する。これにより、油分離器内の油面が所定の高さ位置より低いかどうかを検知する。 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.
　あるいは、仮に、油分離器内の空気の温度と油の温度の差異が大きいのであれば、油分離器内の所定の高さ位置に、温度を検出する検出器を設ける方法が考えられる。詳しく説明すると、この方法では、例えば油分離器内の空気の温度と油の温度の中間となる閾値を予め設定し、検出器で検出された温度が閾値を超えるかどうかを判定することにより、油分離器内の所定の高さ位置に存在する流体が空気及び油のうちのいずれであるかを判定する。これにより、油分離器内の油面が所定の高さ位置より低いかどうかを検知する。 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.
　しかし、実際には、油分離器内の空気の圧力と油の圧力の差異がほとんどなく、空気の温度と油の温度の差異もほとんどない。そのため、油分離器内の油面高さが変動してもしなくとも、検出器の検出値が変動しない。したがって、上述した方法を採用することができない。 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.
　さらに別の方法として、油分離器内の所定の高さ位置に、油の有無を検出する光学式の検出器を設けることが考えられる。しかし、油分離器内では圧縮空気から分離した油が流下する。また、油分離器内の油面がうねることがある。そのため、油分離器内の油面が所定の高さ位置より低い場合でも、検出器に対して油が連続的に通過するか若しくは付着して、検出器が誤検出する可能性がある。したがって、この方法を採用することができない。 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.
　本発明は、上記事柄に鑑みてなされたものであり、気液分離器内の液面高さを監視することを課題の一つとするものである。 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.
　上記課題を解決するために、請求の範囲に記載の構成を適用する。本発明は、上記課題を解決するための手段を複数含んでいるが、その一例を挙げるならば、圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、前記サンプリング配管に流れる流体の圧力又は温度を検出する検出器と、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるかどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、前記制御装置の判定結果を報知する報知装置とを備える。 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.
　また、他の例を挙げるならば、圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、前記液体供給系統上で、前記サンプリング配管の出口側と接続する下流側の系統上に流れる流体の圧力又は温度を検出する検出器と、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるかどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、前記制御装置の判定結果を報知する報知装置とを備える。 As another example, a compressor main body that compresses gas while injecting liquid into the compression chamber, and a gas-liquid separator that separates and stores liquid from the compressed gas discharged from the compressor main body, In the liquid supply type gas compressor comprising a liquid supply system for supplying 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 a predetermined height position of the gas-liquid separator due to a pressure difference between the inlet side and the outlet side, and a downstream system connected to the outlet side of the sampling pipe on the liquid supply system A detector for detecting the pressure or temperature of the fluid flowing above, and determining whether or not the pressure or temperature detected by the detector may exceed a first preset value and detecting by the detector Pressure or temperature previously By performing at least one of the determination as to whether or not the second set value that is set to be smaller than the first set value may be reduced, the fluid flowing through the sampling pipe is out of gas and liquid. A control device that determines which one is included, and a notification device that notifies the determination result of the control device.
　本発明は、サンプリング配管に液体を流した場合にその液体の圧力又は温度に脈動（言い換えれば、周期的に増減を繰り返す大きな変化）がほとんど生じないものの、サンプリング配管に気体を流した場合にその気体の圧力又は温度に脈動が生じるという知見に基づくものであり、サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定することができる。これにより、気液分離器内の液面高さを監視することができる。 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.
　なお、上記以外の課題、構成及び効果は、以下の説明により明らかにされる。 In addition, problems, configurations and effects other than the above will be clarified by the following explanation.
本発明の第１の実施形態における給油式空気圧縮機の構成を表す概略図であり、油分離器内の貯油量が充足している状態を示す。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. 本発明の第１の実施形態における油分離器内の貯油量が不足している状態を示す図である。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. 本発明の第１の実施形態における圧力センサの検出値の経時変化を表す図であり、サンプリング配管に油が流れた場合を示す。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. 本発明の第１の実施形態における圧力センサの検出値の経時変化を表す図であり、サンプリング配管に空気が流れた場合を示す。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. 本発明の第２の実施形態における給油式空気圧縮機の構成を表す概略図であり、油分離器内の貯油量が充足している状態を示す。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. 本発明の第３の実施形態における給油式空気圧縮機の構成を表す概略図であり、油分離器内の貯油量が充足している状態を示す。It is the schematic showing the structure of the oil supply type air compressor in the 3rd Embodiment of this invention, and shows the state with which the oil storage amount in an oil separator is satisfied. 本発明の第３の実施形態における油分離器内の貯油量が不足している状態を示す図である。It is a figure which shows the state in which the oil storage amount in the oil separator in the 3rd Embodiment of this invention is insufficient. 本発明の第３の実施形態における温度センサの検出値の経時変化を表す図であり、サンプリング配管に油が流れた場合を示す。It is a figure showing the time-dependent change of the detected value of the temperature sensor in the 3rd Embodiment of this invention, and shows the case where oil flows into sampling piping. 本発明の第３の実施形態における温度センサの検出値の経時変化を表す図であり、サンプリング配管に空気が流れた場合を示す。It is a figure showing the time-dependent change of the detected value of the temperature sensor in the 3rd Embodiment of this invention, and shows the case where air flows into sampling piping. 本発明の変形例における通信端末を表す概略図である。It is the schematic showing the communication terminal in the modification of this invention.
　本発明の適用対象として給油式空気圧縮機を例にとり、本発明の第１の実施形態を、図面を参照しつつ説明する。 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.
　図１は、本実施形態における給油式空気圧縮機の構成を表す概略図であり、油分離器内の貯油量が充足している状態を示す。図２は、本実施形態における油分離器内の貯油量が不足している状態を示す図である。 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.
　本実施形態の給油式空気圧縮機は、圧縮機本体１と、圧縮機本体１の吸入側に接続された吸入系統２と、圧縮機本体１の吐出側に吐出配管３を介し接続された油分離器４（気液分離器）と、油分離器４の上部に接続された圧縮空気供給系統５（圧縮気体供給系統）と、油分離器４の下部と圧縮機本体１の間で接続された油供給系統６（液体供給系統）と、制御装置７と、表示装置８とを備える。なお、これら圧縮機本体１、吸入系統２、吐出配管３、油分離器４、圧縮空気供給系統５、油供給系統６、制御装置７及び表示装置８は、同一基台（ベース、パレット又はタンクマウント式であれば空気槽等）上に配置して圧縮機ユニット９を構成する。特に、本実施形態では、周面及び上面をパネル板で囲んだ筐体として圧縮機ユニット９を構成するものとする。 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 the same base (base, pallet or tank). If it is a mount type, the compressor unit 9 is configured by placing it on an air tank or the like. In particular, in the present embodiment, the compressor unit 9 is configured as a casing having a peripheral surface and an upper surface surrounded by a panel plate.
　圧縮機本体１は、詳細を図示しないものの、互いに噛み合う雌雄一対のスクリューロータと、それらを収納するケーシングとを有しており、スクリューロータの歯溝に複数の圧縮室が形成されている。スクリューロータが回転すると、圧縮室がロータの軸方向に移動する。圧縮室は、吸入系統２から空気（気体）を吸入し、空気を圧縮し、圧縮空気（圧縮気体）を吐出配管３に吐出する。圧縮機本体１は、圧縮熱の冷却、ロータの潤滑及び圧縮室のシールなどを目的として、例えば圧縮開始直後を始め圧縮過程の何れかの段階で圧縮室に油（液体）を注入するようになっている。 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. For the purpose of cooling the compression heat, lubricating the rotor, and sealing the compression chamber, the compressor body 1 is configured to inject oil (liquid) into the compression chamber at any stage of the compression process, for example, immediately after the start of compression. It has become.
　吸入系統２は、空気中の不純物を除去する吸込みフィルタ１０と、吸込みフィルタ１０の下流側に設けられ、圧縮機本体１の吸入側を閉止可能な吸込み絞り弁１１とを有している。 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.
　油分離器４は、例えば比重分離及び衝突分離を利用して、圧縮機本体１から吐出された圧縮空気から油を分離し、分離した油を下部に貯留する。油分離器４で分離された圧縮空気は、圧縮空気供給系統５を介しユニット外部の使用先へ供給される。圧縮空気供給系統５は、調圧弁（逆止弁）１２と、調圧弁１２の下流側に配置して、圧縮空気を冷却するアフタークーラ１３と、調圧弁１２の下流側に配置して、圧縮空気の圧力（即ち圧縮空気の使用量によって変動する圧力）を検出する制御圧センサ１４とを有している。制御圧センサ１４は、検出圧力を制御装置７に出力する。 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 disposed on the downstream side of the pressure regulating valve (check valve) 12, the pressure regulating valve 12, and cools the compressed air, and is disposed on the downstream side of the pressure regulating valve 12. And a control pressure sensor 14 that detects the pressure of the air (that is, the 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.
　油分離器４で貯留された油は、油分離器４と圧縮機本体１の圧縮室との圧力差によって、油供給系統６を介し圧縮室へ供給される。油供給系統６は、油を冷却するオイルクーラ１５と、オイルクーラ１５をバイパスするバイパス配管１６と、バイパス配管１６の入口（分岐点）に設けられた温度調節弁（三方弁）１７と、バイパス配管１６の出口（合流点）より下流側に配置して、油中の不純物を除去するオイルフィルタ１８とを有する。温度調節弁１７は、油の温度を検知するとともに、油の温度に応じてオイルクーラ１５側の流量とバイパス配管１６側の流量の割合を調節する。これにより、圧縮機本体１へ供給する油の温度を調整する。 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 The oil filter 18 is disposed downstream of the outlet (confluence) 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.
　制御装置７は、プログラムとの協働により演算処理や制御処理を実行する演算制御部（例えばＣＰＵ）と、プログラムや演算処理の結果を記憶する記憶部（例えばＲＯＭ、ＲＡＭ）等を有するものである。制御装置７は、運転制御機能として、制御圧センサ１４で検出された圧力に応じて吸込み絞り弁１１の開閉状態を制御し、これによって圧縮機本体１の運転状態を切り替えるようになっている。なお、制御装置７全部又は一部をアナログ回路構成とすることも可能である。 The control device 7 includes an arithmetic control unit (for example, CPU) that executes arithmetic processing and control processing in cooperation with a program, and a storage unit (for example, ROM, RAM) that stores the results of the program and arithmetic processing. is there. 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. Note that all or part of the control device 7 may have an analog circuit configuration.
　詳しく説明すると、制御装置７は、圧縮機本体１の負荷運転時に（言い換えれば、吸込み絞り弁１１が開状態である場合に）、制御圧センサ１４で検出された圧力が予め設定されたアンロード開始圧力Ｐｕとなるまで上昇したかどうかを判定する。そして、制御圧センサ１４で検出された圧力がアンロード開始圧力Ｐｕとなる場合に、吸込み絞り弁１１を閉状態に制御して、圧縮機本体１の無負荷運転に切り替える。 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. Then, 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.
　制御装置７は、圧縮機本体１の無負荷運転時に（言い換えれば、吸込み絞り弁１１が閉状態である場合に）、制御圧センサ１４で検出された圧力が予め設定されたロード復帰圧力Ｐｄ（但し、Ｐｄ＜Ｐｕ）となるまで下降したかどうかを判定する。そして、制御圧センサ１４で検出された圧力がロード復帰圧力Ｐｄとなる場合に、吸込み絞り弁１１を開状態に制御して、圧縮機本体１の負荷運転に切り替える。以上の運転切り替えにより、圧縮空気使用量が低下した際に、消費動力の低減を図ることができるようになっている。 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 switched to the load operation of the compressor body 1. With the above operation switching, when the amount of compressed air used is reduced, the power consumption can be reduced.
　ここで、本実施形態の特徴の一つとして、給油式空気圧縮機は、入口側が油分離器４の所定の高さ位置Ｈ（詳細には、例えば圧縮機駆動時に所望の貯油量に対応する油面の高さ位置）に接続され、出口側が油供給系統６のオイルフィルタ１８の上流側に接続されたサンプリング配管１９と、サンプリング配管１９に流れる流体の圧力を検出する圧力センサ２０（検出器）とを備える。なお、本実施例ではサンプリング配管１９は、油供給系統６より流量が小さくなるように、例えば油供給系統６の配管より断面積が小さくなっているが、これに限定するものではない。圧力センサ２０は、検出圧力を制御装置７に出力する。 Here, as one of the features of this embodiment, the oil supply type air compressor has an inlet side corresponding to a predetermined height position H of the oil separator 4 (specifically, for example, a desired oil storage amount when the compressor is driven). A sampling pipe 19 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. ). In this embodiment, 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, but the present invention is not limited to this. The pressure sensor 20 outputs the detected pressure to the control device 7.
　制御装置７は、油面高さ検知機能として、圧縮機本体１の負荷運転時に（言い換えれば、圧縮機本体１の無負荷運転時より、油分離器４内の油面が低くなる場合に）、圧力センサ２０で検出された圧力が予め設定された設定範囲外となることがあるかどうかの判定（言い換えれば、予め設定された設定値Ｐ１を上回ることがあるかどうかの判定と予め設定された設定値Ｐ２（但し、Ｐ２＜Ｐ１）を下回ることがあるかどうかの判定）を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定し、その判定結果を表示装置８に出力する。表示装置８は、制御装置７の判定結果を報知するようになっている。 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) By determining whether the fluid flowing through the sampling pipe 19 is air or oil (or which is main). The determination is made, and the determination result is output to the display device 8. The display device 8 notifies the determination result of the control device 7.
　詳しく説明すると、図１で示すように、油分離器４内の油面が所定の高さ位置Ｈ（言い換えれば、サンプリング配管１９の入口側が接続された位置）より高い場合は、サンプリング配管１９に油が流れる。この場合、図３で示すように、圧力センサ２０で検出された油の圧力は脈動が生じず、設定範囲内（言い換えれば、設定値Ｐ１以下かつ設定値Ｐ２以上）にある。そのため、制御装置７は、サンプリング配管１９に流れる流体が油であると判定する。これにより、油分離器４内の油面が所定の高さ位置Ｈより高いことを検知することができる。 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.
　一方、図２で示すように、油分離器４内の油面が所定の高さ位置Ｈより低い場合は、サンプリング配管１９に空気が流れる。この場合、図４で示すように、圧力センサ２０で検出された空気の圧力は脈動が生じ、設定範囲外となる（言い換えれば、設定値Ｐ１を上回るか若しくは設定値Ｐ２を下回る）ことがある。そのため、制御装置７は、サンプリング配管１９に流れる流体が空気であると判定する。これにより、油分離器４内の油面が所定の高さ位置Ｈより低いことを検知することができる。 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.
　表示装置８は、サンプリング配管１９に流れる流体が空気であるとの判定結果を入力した場合に、その判定結果に基づいた報知情報として、例えば「警報：潤滑油不足」又は「警報：潤滑油を補給してください」のメッセージ等を表示する。また、表示装置８は、サンプリング配管１９に流れる流体が油であるとの判定結果を入力してもよく、その判定結果に基づいた情報として、例えば「潤滑油充足」のメッセージ等を表示してもよい。なお、これらの報知方法は音や振動或いはこれらも組み合わせた種々の態様であってもよい。 When the determination result that the fluid flowing through the sampling pipe 19 is air is input, the display device 8 uses, for example, “alarm: insufficient lubricating oil” or “alarm: lubricating oil” as notification information based on the determination result. Please replenish "message. 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. In addition, these alerting | reporting methods may be various modes which combined sound, vibration, or these.
　以上のように本実施形態は、サンプリング配管１９に油（液体）が流れた場合にその油の圧力に脈動がほとんど生じないものの、サンプリング配管１９に空気（気体）が流れた場合にその空気の圧力に脈動が生じるという知見に基づくものであり、サンプリング配管１９に流れる流体が油及び空気のうちのいずれ（或いはいずれが主）であるかを判定することができる。これにより、油分離器４内の油面高さを精度よく監視することができる。 As described above, according to 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, It 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 main). Thereby, the oil level height in the oil separator 4 can be accurately monitored.
　なお、第１の実施形態において、制御装置７は、圧力センサ２０で検出された圧力が設定範囲外となることがあるかどうかの判定（言い換えれば、圧力センサ２０で検出された圧力が設定値Ｐ１を上回ることがあるかどうかの判定と設定値Ｐ２を下回ることがあるかどうかの判定の両方）を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定する場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。 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). By determining whether or not the value may exceed P1 and determining whether or not the value may be less than the set value P2, the fluid flowing through the sampling pipe 19 may be either air or oil (or which is the main). 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.
　第１の変形例として、制御装置７は、圧力センサ２０で検出された圧力が設定値Ｐ１を上回ることがあるかどうかの判定と設定値Ｐ２を下回ることがあるかどうかの判定のうちの一方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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 (or which is the main). Even in such a modification, the same effect as described above can be obtained.
　第２の変形例として、制御装置７は、圧力センサ２０で検出された圧力が設定値Ｐ１を上回る頻度が所定値より多いかどうかの判定と圧力センサ２０で検出された圧力が設定値Ｐ２を下回る頻度が所定値より多いかどうかの判定のうちの一方若しくは両方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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. Even if it determines whether the fluid which flows into sampling piping 19 is one of air and oil (or which is the main) by performing one or both of the judgment of whether the frequency which falls below is more than a predetermined value Good. Even in such a modification, the same effect as described above can be obtained.
　第３の変形例として、制御装置７は、圧力センサ２０で検出された圧力における変化率（詳細には、例えば圧力センサ２０の検出時間間隔毎に得られる圧力の変化率）を演算し、この変化率が予め設定された正の設定値を上回ることがあるどうかの判定と予め設定された負の設定値を下回ることがあるかどうかの判定のうちの一方若しくは両方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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 You may determine whether the fluid which flows to 19 is air (or which is main) among air and oil. Even in such a modification, the same effect as described above can be obtained.
　本発明の第２の実施形態を、図面を参照しつつ説明する。なお、本実施形態において、第１の実施形態と同一の部分は同一の符号を付し、適宜、説明を省略する。 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.
　図５は、本実施形態における給油式圧縮機の構成を表す概略図である。第１の実施形態との構成上の主な相違点は、第２の実施形態におけるサンプリング配管１９Ａは、その出口側が、油供給系統６上で温度調節弁１７よりも上流側と接続する構成である点と、圧力センサ２０が、油供給系統６上でサンプリング配管１９Ａの出口より下流側（本実施形態では、バイパス配管１６の出口よりも下流側）に配置する点である。即ち第２の実施形態は、サンプリング配管１９Ａの圧力脈動ではなく、サンプリング配管１９Ａによって油供給系統６に生ずる圧力脈動を検出する点を特徴の一つとする。 FIG. 5 is a schematic diagram showing the configuration of the oil-filled compressor in the present embodiment. The main difference in configuration from the first embodiment is that the sampling pipe 19A in the second embodiment has an outlet side connected to the upstream side of the temperature control valve 17 on the oil supply system 6. There is a point that the pressure sensor 20 is arranged on the oil supply system 6 downstream from the outlet of the sampling pipe 19A (in the present embodiment, downstream from the outlet of the bypass pipe 16). That is, the second embodiment is characterized in that not the pressure pulsation of the sampling pipe 19A but the pressure pulsation generated in the oil supply system 6 by the sampling pipe 19A is detected.
　詳細に説明すると、例えば圧縮機が負荷運転時にある場合、油分離器４内の油面位置がサンプリング配管１９Ａの入口側位置より低下すれば、第１の実施形態と同様に、サンプリング配管１９Ａを介して油供給系統６に空気が流れる。即ちバイパス配管１６には空気又は油或いはこれらの混在流体が流れ、圧力脈動が発生する。この脈動の変化を、第１の実施形態と同様に、圧力センサ２０によって検出し、制御装置が油面の高さを検出することができるようになっている。 More specifically, for example, when the compressor is in a load operation, if the oil level position in the oil separator 4 is lower than the inlet side position of the sampling pipe 19A, the sampling pipe 19A is changed as in the first embodiment. Air flows into the oil supply system 6 through the air supply system 6. That is, air, oil, or a mixed fluid thereof flows through the bypass pipe 16 and pressure pulsation occurs. This change in pulsation is detected by the pressure sensor 20 as in the first embodiment, and the control device can detect the height of the oil level.
　なお、圧力センサ２０が、油供給系統６上でサンプリング配管１９Ａの出口側接続部より下流側であれば、サンプリング配管１９Ａの接続構成を第１の実施形態と同様とする構成であってもよい。 If the pressure sensor 20 is on the downstream side of the outlet side connection portion of the sampling pipe 19A on the oil supply system 6, the connection structure of the sampling pipe 19A may be the same as that of the first embodiment. .
　このような第２の実施形態であっても、第１の実施形態及びその変形例と同様な効果をえることができる。特に、本実施形態であれば、サンプリング配管１９Ａのサイズが小となり、配管構成の簡素化と、部材コストの低減といった効果を期待することもできる。 Even in such a second embodiment, the same effects as those of the first embodiment and its modifications can be obtained. In particular, according to the present embodiment, the size of the sampling pipe 19A is reduced, and it is possible to expect effects such as simplification of the pipe configuration and reduction of member costs.
　本発明の第３の実施形態を、図面を参照しつつ説明する。なお、本実施形態において、第１や第２の実施形態と同一の部分は同一の符号を付し、適宜、説明を省略する。 A third 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 and second embodiments are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
　図６は、本実施形態における給油式空気圧縮機の構成を表す概略図であり、油分離器４内の貯油量が充足している状態を示す。図７は、本実施形態における油分離器４内の貯油量が不足している状態を示す図である。 FIG. 6 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. 7 is a diagram illustrating a state where the amount of oil stored in the oil separator 4 in the present embodiment is insufficient.
　本実施形態の給油式空気圧縮は、圧力センサ２０に代えて、サンプリング配管１９に流れる流体の温度を検出する温度センサ２１（検出器）を備えている。温度センサ２１は、検出温度を制御装置７Ａに出力する。 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.
　制御装置７Ａは、油面高さ検知機能として、圧縮機本体１の負荷運転時に、温度センサ２１で検出された温度が予め設定された設定範囲外となることがあるかどうかの判定（言い換えれば、予め設定された設定値Ｔ１を上回ることがあるかどうかの判定と予め設定された設定値Ｔ２（但し、Ｔ２＜Ｔ１）を下回ることがあるかどうかの判定の両方）を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれであるかを判定し、その判定結果を表示装置８に出力するようになっている。 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.
　詳しく説明すると、図６で示すように、油分離器４内の油面が所定の高さ位置Ｈより高い場合は、サンプリング配管１９に油が流れる。この場合、図８で示すように、温度センサ２１で検出された油の温度は脈動が生じず、設定範囲内（言い換えれば、設定値Ｔ１以下かつ設定値Ｔ２以上）にある。そのため、制御装置７Ａは、サンプリング配管１９に流れる流体が油であると判定する。これにより、油分離器４内の油面が所定の高さ位置Ｈより高いことを検知することができる。 More specifically, as shown in FIG. 6, 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. 8, 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.
　一方、図７で示すように、油分離器４内の油面が所定の高さ位置Ｈより低い場合は、サンプリング配管１９に空気が流れる。この場合、図９で示すように、温度センサ２１で検出された空気の温度は脈動が生じ、設定範囲外となる（言い換えれば、設定値Ｔ１を上回るか、若しくは設定値Ｔ２を下回る）ことがある。そのため、制御装置７Ａは、サンプリング配管１９に流れる流体が空気であると判定する。これにより、油分離器４内の油面が所定の高さ位置Ｈより低いことを検知することができる。 On the other hand, as shown in FIG. 7, 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. 9, 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.
　表示装置８は、サンプリング配管１９に流れる流体が空気であるとの判定結果を入力した場合に、その判定結果に基づいた情報として、例えば「警報：潤滑油不足」又は「警報：潤滑油を補給してください」のメッセージ等を表示する。また、表示装置８は、サンプリング配管１９に流れる流体が油であるとの判定結果を入力してもよく、その判定結果に基づいた情報として、例えば「潤滑油充足」のメッセージ等を表示してもよい。 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.
　以上のように本実施形態は、サンプリング配管１９に油（液体）を流した場合にその油の温度に脈動がほとんど生じないものの、サンプリング配管１９に空気（気体）を流した場合にその空気の温度に脈動が生じるという知見に基づくものであり、サンプリング配管１９に流れる流体が油及び空気のうちのいずれ（或いはいずれが主）であるかを判定することができる。これにより、油分離器４内の油面高さを監視することができる。 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 the temperature, and it can be determined whether the fluid flowing through the sampling pipe 19 is oil (or the main). Thereby, the oil level height in the oil separator 4 can be monitored.
　なお、第３の実施形態において、制御装置７Ａは、温度センサ２１で検出された温度が設定範囲外となることがあるかどうかの判定（言い換えれば、温度センサ２１で検出された温度が設定値Ｔ１を上回ることがあるかどうかの判定と設定値Ｔ２を下回ることがあるかどうかの判定の両方）を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定する場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。 In the third 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 performing both the determination of whether or not T1 may be exceeded and the determination of whether or not the set value T2 may be exceeded, the fluid flowing through the sampling pipe 19 may be either air or oil (or which is the main). 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.
　第４の変形例として、制御装置７Ａは、温度センサ２１で検出された温度が設定値Ｔ１を上回ることがあるかどうかの判定と設定値Ｔ２を下回ることがあるかどうかの判定のうちの一方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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 (or which is the main). Even in such a modification, the same effect as described above can be obtained.
　第５の変形例として、制御装置７Ａは、温度センサ２１で検出された温度が設定値Ｔ１を上回る頻度が所定値より多いかどうかの判定と温度センサ２１で検出された温度が設定値Ｔ２を下回る頻度が所定値より多いかどうかの判定のうちの一方若しくは両方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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. Even if it determines whether the fluid which flows into sampling piping 19 is one of air and oil (or which is the main) by performing one or both of the judgment of whether the frequency which falls below is more than a predetermined value Good. Even in such a modification, the same effect as described above can be obtained.
　第６の変形例として、制御装置７Ａは、温度センサ２１で検出された温度における変化率（詳細には、例えば温度センサ２１の検出時間間隔毎に得られる温度の変化率）を演算し、この変化率が予め設定された正の設定値を上回ることがあるどうかの判定と予め設定された負の設定値を下回ることがあるかどうかの判定のうちの一方若しくは両方を行うことにより、サンプリング配管１９に流れる流体が空気及び油のうちのいずれ（或いはいずれが主）であるかを判定してもよい。このような変形例でも、上記同様の効果を得ることができる。 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 You may determine whether the fluid which flows to 19 is air (or which is main) among air and oil. Even in such a modification, the same effect as described above can be obtained.
　なお、第２の実施形態の構成（図５）を、第３の実施形態に適用することも当然に可能である。即ち第２の実施形態による圧力センサ２０を、第３の実施形態による温度センサ２１に置換しても第３の実施形態と同様の効果を得ることができる。 Of course, the configuration of the second embodiment (FIG. 5) can also be applied to the third embodiment. That is, even if the pressure sensor 20 according to the second embodiment is replaced with the temperature sensor 21 according to the third embodiment, the same effect as that of the third embodiment can be obtained.
　また、第１から第３の実施形態並びに上記変形例において、制御装置７又は７Ａの判定結果を報知する報知装置は、圧縮機ユニット９に搭載され、制御装置７又は７Ａの判定結果に基づいた情報を表示する表示装置８である場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。図１０で示す第７の変形例のように、報知装置は、例えば、圧縮機ユニット９から離間され、通信回線２２を介し受信した制御装置７又は７Ａの判定結果に基づいた情報（詳細には、例えば「警報：潤滑油不足」又は「警報：潤滑油を補給してください」のメッセージ等）を表示する通信端末２３であってもよい。なお、通信端末２３は、通信接続の構成として離間する構成であれば、圧縮機ユニット９と物理的に接触する構成であってもよい。例えば、圧縮機ユニット９の何れかの場所に通信端末２３を載置や懸止させ、離間可能に一次的に固定する構成であってもよい。 In the first to third 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. 10, for example, the notification device is separated from the compressor unit 9 and is based on information (specifically, based on the determination result of the control device 7 or 7 </ b> A 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”. Note that the communication terminal 23 may be configured to physically contact the compressor unit 9 as long as the communication terminal 23 is configured to be separated as a communication connection configuration. For example, the communication terminal 23 may be placed or suspended in any place of the compressor unit 9 and temporarily fixed so as to be separated.
　また、図１０に示す通信回線を利用する他の構成としては、制御装置７又は７Ａの判定機能を通信回線２２を介して接続された外部演算装置（サーバ等）に備え、その判定結果を外部演算装置から通信回線２２を介して通信端末２３に報知させる構成であってもよい。更には、通信端末２３に、制御装置７又は７Ａの判定機能を備える構成としてもよい。 As another configuration using the communication line shown in FIG. 10, the determination function of the control device 7 or 7A is provided in an external arithmetic device (server or the like) connected via the communication line 22, and the determination result is externally transmitted. The configuration may be such that the communication terminal 23 is notified from the arithmetic device via the communication line 22. Furthermore, the communication terminal 23 may be configured to have the determination function of the control device 7 or 7A.
　なお、図示しないものの、報知装置は、例えば圧縮機ユニット９に搭載された警報ランプ又は警報ブザーであってもよい。そして、制御装置７又は７Ａは、サンプリング配管１９に流れる流体が空気であると判定した場合に、警報ランプ又は警報ブザーを駆動してもよい。これらの変形例においても、上記同様の効果を得ることができる。 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.
　また、第１から第３の実施形態において、サンプリング配管１９（１９Ａ）は、その出口側が油供給系統６のオイルフィルタ１８の上流側に接続された場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。即ちサンプリング配管が、入口側が油分離器４の所定の高さ位置に接続し、入口側（高圧側）と出口側（低圧側）の圧力差によって油分離器４の所定の高さ位置からの流体を流すように構成されていればよい。そのため、サンプリング配管の出口側が接続される部位は、油分離器４内の圧力より、少なくともサンプリング配管の圧力損失のぶんだけ低圧であればよい。 Further, in the first to third embodiments, the sampling pipe 19 (19A) has been described by taking an example in which the outlet side is connected to the upstream side of the oil filter 18 of the oil supply system 6, but the present invention is not limited thereto. Modifications can be made without departing from the spirit and technical idea of the present invention. That is, the sampling pipe is connected to a predetermined height position of the oil separator 4 on the inlet side, and from the predetermined height position of the oil separator 4 by the pressure difference between the inlet side (high pressure side) and the outlet side (low pressure side). What is necessary is just to be comprised so that a fluid may flow. 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.
　また、第１から第３の実施形態において、給油式空気圧縮機は、圧縮機本体１を負荷運転から無負荷運転に切り替えるために、圧縮機本体１の吸入側を閉止する吸込み絞り弁１１を設けた場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。 In the first to third 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.
　給油式空気圧縮機は、圧縮機本体１を負荷運転から無負荷運転に切り替えるために、吸込み絞り弁１１に代えて、圧縮機本体１の吐出側（詳細には、圧縮空気供給系統５の調圧弁１２より上流側）を放気する放気弁２４（図１、図５又は図６中点線で示す）を備えるもよい。そして、制御装置７又は７Ａは、制御圧センサ１４で検出された圧力がアンロード開始圧力Ｐｕとなる場合に、放気弁２４を開状態に制御して、圧縮機本体１を負荷運転から無負荷運転に切り替える。また、制御圧センサ１４で検出された圧力がロード復帰圧力Ｐｄとなる場合に、放気弁２４を閉状態に制御して、圧縮機本体１を無負荷運転から負荷運転に切り替える。 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, FIG. 5, or FIG. 6) for releasing air from 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 discharge valve 24 is controlled to be closed, and the compressor body 1 is switched from the no-load operation to the load operation.
　あるいは、給油式空気圧縮機は、吸込み絞り弁１１と放気弁２４の両方を備えてもよい。また、給油式空気圧縮機は、圧縮機本体１を負荷運転から無負荷運転に切り替えないように構成してもよい。即ち吸込み絞り弁１１又は放気弁２４を備えず、制御装置７又は７Ａが上述した運転制御機能を有しなくともよい。これらの変形例においても、上記同様の効果を得ることができる。 Alternatively, the oil supply type air compressor may include both the suction throttle valve 11 and the discharge valve 24. The oil supply type air compressor may be configured not to switch the compressor main body 1 from the load operation to the 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.
　なお、以上においては、給油式空気圧縮機に本発明を適用した場合を例にとって説明したが、これに限られない。例えば、圧縮室に水（液体）を注入しつつ空気（気体）を圧縮する圧縮機本体と、圧縮機本体から吐出された圧縮空気（圧縮気体）から水を分離して貯留する水分離器（気液分離器）と、水分離器で貯留された水を圧縮機本体へ供給する水供給系統（液体供給系統）とを備えた給水式空気圧縮機に、本発明を適用してもよい。この給水式空気圧縮機に本発明を適用した場合は、水分離器内の水面高さを監視することができる。また、空気以外の気体を圧縮する圧縮機に、本発明を適用してもよい。 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. For example, a compressor main body that compresses air (gas) while injecting water (liquid) into a compression chamber, and a water separator that separates and stores water from compressed air (compressed gas) discharged from the compressor main body ( The present invention may be applied to a water supply type air compressor including a gas-liquid separator) and a water supply system (liquid supply system) that supplies water stored in the water separator to the compressor body. 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.
　また、以上では、雄雌スクリューロータからなる所謂ツインスクリューロータの圧縮機構を例にとって説明したが、これに限られない。例えば、容積型やターボ型といった種々の圧縮機構を適用することもできる。容積型であれば回転式や往復動式等であり、回転式としてはシングル、ツイン及びマルチのスクリューロータや、シングル及びマルチのスクロールラップや、ベーン式や、クロー式等を含む。往復動式としては、シングル及びマルチのレシプロ式等を含む。更に、圧縮機本体も１台構成に限らず、同形式或いは異なる形式による組み合わせからなる多段構成であっても適用することができる。 In the above description, the compression mechanism of a so-called twin screw rotor composed of male and female screw rotors has been described as an example, but the present invention is not limited thereto. For example, various compression mechanisms such as a positive displacement type and a turbo type can be applied. The positive displacement type includes a rotary type and a reciprocating type, and the rotary type includes single, twin and multi screw rotors, single and multi scroll wraps, a vane type and a claw type. The reciprocating type includes single and multiple reciprocating types. Furthermore, the compressor main body is not limited to a single unit configuration, and can be applied to a multi-stage configuration composed of combinations of the same format or different formats.
　１…圧縮機本体、４…油分離器（気液分離器）、６…油供給系統（液体供給系統）、７，７Ａ…制御装置、８…表示装置（報知装置）、９…圧縮機ユニット、１１…吸込み絞り弁、１９，１９Ａ…サンプリング配管、２０…圧力センサ（検出器）、２１…温度センサ（検出器）、２２…通信回線、２３…通信端末（報知装置）、２４…放気弁 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, 19A ... Sampling piping, 20 ... Pressure sensor (detector), 21 ... Temperature sensor (detector), 22 ... Communication line, 23 ... Communication terminal (notification device), 24 ... Air release valve

Claims (14)

  1. 　圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、
    　入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、
    　前記サンプリング配管に流れる流体の圧力又は温度を検出する検出器と、
    　前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるかどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、
    　前記制御装置の判定結果を報知する報知装置とを備える給液式気体圧縮機。     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.
  2. 　請求項１に記載の給液式気体圧縮機において、
    　前記制御装置が、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定の両方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定するものである給液式気体圧縮機。     The liquid supply type gas compressor according to claim 1,
    The control device determines 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 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.
  3. 　請求項１に記載の給液式気体圧縮機において、
    　前記圧縮機本体の負荷運転から無負荷運転に切り替えるために、前記圧縮機本体の吸入側を閉止する吸込み絞り弁と前記圧縮機本体の吐出側を放気する放気弁のうちの少なくとも一方を備え、
    　前記制御装置が、前記圧縮機本体の負荷運転時に、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定するものである給液式気体圧縮機。     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,
    In the load operation of the compressor body, the control device determines whether the pressure or temperature detected by the detector may exceed a preset first set value 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 for determining whether a gas or a liquid is used.
  4. 　請求項１に記載の給液式気体圧縮機において、
    　前記サンプリング配管の出口側が、前記液体供給系統に接続するものである給液式気体圧縮機。     The liquid supply type gas compressor according to claim 1,
    A liquid supply type gas compressor in which an outlet side of the sampling pipe is connected to the liquid supply system.
  5. 　請求項１に記載の給液式気体圧縮機において、
    　前記圧縮機本体、前記気液分離器及び前記液体供給系統が、同一ベース上に配置する圧縮機ユニットを構成するものであり、
    　前記報知装置が、前記圧縮機ユニットに搭載され、前記制御装置の判定結果に基づいた情報を表示する表示装置である給液式気体圧縮機。     The liquid supply type gas compressor according to claim 1,
    The compressor body, the gas-liquid separator and the liquid supply system constitute a compressor unit disposed on the same base,
    A liquid supply type gas compressor, wherein the notification device is a display device that is mounted on the compressor unit and displays information based on a determination result of the control device.
  6. 　請求項１に記載の給液式気体圧縮機において、
    　前記圧縮機本体、前記気液分離器及び前記液体供給系統が、同一ベース上に配置する圧縮機ユニットを構成するものであり、
    　前記報知装置が、前記圧縮機ユニットから離間し、通信回線を介し受信した前記制御装置の判定結果に基づいた情報を表示する通信端末である給液式気体圧縮機。     The liquid supply type gas compressor according to claim 1,
    The compressor body, the gas-liquid separator and the liquid supply system constitute a compressor unit disposed on the same base,
    The liquid supply-type gas compressor which is a communication terminal which displays the information based on the determination result of the said control apparatus which the said alerting | reporting apparatus separated from the said compressor unit and received via the communication line.
  7. 　圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、
    　入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、
    　前記液体供給系統上で、前記サンプリング配管の出口側と接続する下流側の系統上に流れる流体の圧力又は温度を検出する検出器と、
    　前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるかどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、
    　前記制御装置の判定結果を報知する報知装置とを備える給液式気体圧縮機。     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;
    On the liquid supply system, a detector for detecting the pressure or temperature of the fluid flowing on the downstream system connected to the outlet side of 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.
  8. 　請求項７に記載の給液式気体圧縮機において、
    　前記制御装置が、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定の両方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定するものである給液式気体圧縮機。     In the liquid supply type gas compressor according to claim 7,
    The control device determines 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 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.
  9. 　請求項７に記載の給液式気体圧縮機において、
    　前記圧縮機本体の負荷運転から無負荷運転に切り替えるために、前記圧縮機本体の吸入側を閉止する吸込み絞り弁と前記圧縮機本体の吐出側を放気する放気弁のうちの少なくとも一方を備え、
    　前記制御装置が、前記圧縮機本体の負荷運転時に、前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回ることがあるどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定するものである給液式気体圧縮機。     In the liquid supply type gas compressor according to claim 7,
    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,
    In the load operation of the compressor body, the control device determines whether the pressure or temperature detected by the detector may exceed a preset first set value 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 for determining whether a gas or a liquid is used.
  10. 　請求項７に記載の給液式気体圧縮機において、
    　前記サンプリング配管の出口側が、前記液体供給系統に接続するものである給液式気体圧縮機。     In the liquid supply type gas compressor according to claim 7,
    A liquid supply type gas compressor in which an outlet side of the sampling pipe is connected to the liquid supply system.
  11. 　請求項７に記載の給液式気体圧縮機において、
    　前記圧縮機本体、前記気液分離器及び前記液体供給系統が、同一ベース上に配置する圧縮機ユニットを構成するものであり、
    　前記報知装置が、前記圧縮機ユニットに搭載され、前記制御装置の判定結果に基づいた情報を表示する表示装置である給液式気体圧縮機。     In the liquid supply type gas compressor according to claim 7,
    The compressor body, the gas-liquid separator and the liquid supply system constitute a compressor unit disposed on the same base,
    A liquid supply type gas compressor, wherein the notification device is a display device that is mounted on the compressor unit and displays information based on a determination result of the control device.
  12. 　請求項７に記載の給液式気体圧縮機において、
    　前記圧縮機本体、前記気液分離器及び前記液体供給系統が、同一ベース上に配置する圧縮機ユニットを構成するものであり、
    　前記報知装置が、前記圧縮機ユニットから離間し、通信回線を介し受信した前記制御装置の判定結果に基づいた情報を報知する通信端末である給液式気体圧縮機。     In the liquid supply type gas compressor according to claim 7,
    The compressor body, the gas-liquid separator and the liquid supply system constitute a compressor unit disposed on the same base,
    The liquid supply type gas compressor which is a communication terminal which notifies the information based on the determination result of the said control apparatus which the said alerting | reporting apparatus separated from the said compressor unit and received via the communication line.
  13. 　圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、
    　入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、
    　前記サンプリング配管に流れる或いは前記サンプリング配管を流れた流体の圧力又は温度を検出する検出器と、
    　前記検出器で検出された圧力又は温度が予め設定された第１の設定値を上回る頻度が所定値より多いかどうかの判定と前記検出器で検出された圧力又は温度が予め前記第１の設定値より小さくなるように設定された第２の設定値を下回る頻度が所定値より多いかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、
    　前記制御装置の判定結果を報知する報知装置とを備える給液式気体圧縮機。     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 or 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.
  14. 　圧縮室に液体を注入しつつ気体を圧縮する圧縮機本体と、前記圧縮機本体から吐出された圧縮気体から液体を分離して貯留する気液分離器と、前記気液分離器で貯留された液体を前記圧縮機本体へ供給する液体供給系統とを備えた給液式気体圧縮機において、
    　入口側が前記気液分離器の所定の高さ位置に接続され、入口側と出口側の圧力差によって前記気液分離器の所定の高さ位置からの流体を流すサンプリング配管と、
    　前記サンプリング配管に流れる或いは前記サンプリング配管を流れた流体の圧力又は温度を検出する検出器と、
    　前記検出器で検出された圧力又は温度における変化率を演算し、前記変化率が予め設定された正の設定値を上回ることがあるどうかの判定と前記変化率が予め設定された負の設定値を下回ることがあるかどうかの判定のうちの少なくとも一方を行うことにより、前記サンプリング配管に流れる流体が気体及び液体のうちのいずれであるかを判定する制御装置と、
    　前記制御装置の判定結果を報知する報知装置とを備える給液式気体圧縮機。     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 or 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.
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