US20220252065A1 - Fluid Machine Device - Google Patents

Fluid Machine Device Download PDF

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Publication number
US20220252065A1
US20220252065A1 US17/626,031 US202017626031A US2022252065A1 US 20220252065 A1 US20220252065 A1 US 20220252065A1 US 202017626031 A US202017626031 A US 202017626031A US 2022252065 A1 US2022252065 A1 US 2022252065A1
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Prior art keywords
fluid machine
pressure
fluid
worn
control unit
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US17/626,031
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English (en)
Inventor
Akihiro Yamamoto
Yoshiyuki Kanemoto
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Assigned to HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. reassignment HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMOTO, AKIHIRO, KANEMOTO, YOSHIYUKI
Publication of US20220252065A1 publication Critical patent/US20220252065A1/en
Pending legal-status Critical Current

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    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • 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
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/08—Cylinder or housing parameters
    • F04B2201/0801—Temperature
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • 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
    • F04C2270/02—Power
    • 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
    • F04C2270/07—Electric current
    • 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
    • F04C2270/12—Vibration
    • 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
    • F04C2270/13—Noise
    • 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
    • F04C2270/18—Pressure
    • 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
    • F04C2270/19—Temperature
    • 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
    • F04C2270/80—Diagnostics

Definitions

  • the present invention relates to a fluid machine device.
  • a gas compressor has been known which generates compressed gas to be used as a power source of a production line or as an air source of a machine tool, a press machine, an air blower, or the like.
  • the gas compressor includes a compressor body that compresses gas in a compression chamber that a casing forms, and is configured to discharge the compressed gas from a discharge port to a gas tank via a discharge pipe.
  • Patent Document 1 A technique of Patent Document 1 has been known as a gas compressor.
  • a gas compressor when the temperature of a compressor body is higher than an upper limit temperature, no-load operation is performed to protect components from failure, deterioration, and the like caused by high temperature and to extend the life of the components, so that durability can be improved.
  • no-load operation is performed when high temperature is detected in a package.
  • the no-load operation has been described as an operation state in which a compression operation is not performed (refer to paragraph 0041).
  • a multi-compressor equipped with a plurality of compressor bodies is a fluid machine device that increases or decreases the number of the compressor bodies to be operated according to a compressed air usage amount of a user to generate required compressed air.
  • a fluid machine device when an abnormality occurs in one compressor body, the compressor body in which the abnormality has occurred undergoes no-load operation as in Patent Document 1, so that the compressor body can be protected.
  • An object of the present invention is to provide a fluid machine device capable of supplying required compressed air while protecting fluid machines.
  • a fluid machine device including: a plurality of fluid machines that discharge a fluid; a worn state detection unit that detects a worn state of the fluid machine; a pressure detection unit that measures a pressure from the fluid machines; and a control unit that controls the plurality of fluid machines.
  • the control unit determines whether or not there is the fluid machine that is worn, and performs control to start operation of the fluid machine that is not worn when the pressure is insufficient.
  • required compressed air can be supplied while protecting the fluid machines.
  • FIG. 1 is a cross-sectional view of a compressor body of a first embodiment.
  • FIG. 2 is an internal structure of a fluid machine device of the first embodiment.
  • FIG. 3 is a conceptual graph of an operation in which a fluid machine is stopped at an expected reach time taken to reach a stop pressure.
  • FIG. 4 is a conceptual graph of operations during normal operation and when wear of one compressor is detected in the first embodiment.
  • FIG. 5 is a schematic graph of a pressure transition in the case of lengthening an expected reach time taken to reach a stop pressure.
  • FIG. 6 is a conceptual diagram of a configuration of the fluid machine in the first embodiment.
  • FIG. 7 is a conceptual graph of an operation in which a stop pressure is lowered and the fluid machine is stopped.
  • FIG. 8 is a flowchart illustrating a flow of a stop determination to be performed on pressure machine bodies when wear of the compressor bodies is not determined.
  • FIG. 9 is a flowchart illustrating a flow of a stop determination to be performed on pressure machine bodies when it is determined whether or not there are compressor bodies that are worn.
  • FIG. 10 is a flowchart illustrating a flow of an operation start determination to be performed on pressure machine bodies when wear of the compressor bodies is not determined.
  • FIG. 11 is a flowchart illustrating a flow of an operation start determination to be performed on pressure machine bodies when it is determined whether or not there are compressor bodies that are worn.
  • a fluid machine device which is equipped with a plurality of scroll compressor bodies (fluid machines) in each of which a compression chamber is formed between a fixed scroll and an orbiting scroll and each of which undergoes orbital motion to compress air.
  • FIG. 1 is a cross-sectional view of a compressor body in a first embodiment.
  • power is transmitted from a motor including a stator 101 and a rotor 102 to a scroll compressor including an orbiting scroll 104 and a fixed scroll 105 via a shaft 103 .
  • Air compressed by the scroll compressor passes through a pipe from a discharge port 109 , and passes through a fluid machine device such as an aftercooler.
  • the rotational speed of the motor changes with the frequency of a voltage to be output from an inverter 107 .
  • Power is transmitted from the shaft 103 to a cooling fan 106 , and the cooling fan 106 sends generated cooling air to cooling fins of the orbiting scroll 104 and the fixed scroll 105 via a duct (not illustrated) to cool the compressor.
  • a temperature sensor 108 is disposed at a tip of the cooling fin of the fixed scroll 105 .
  • the temperature sensor 108 serves as a worn state detection unit that detects a worn state of the compressor using measured temperature.
  • the orbiting scroll 104 and the fixed scroll 105 slide against each other, thereby causing a tip seal disposed in tip portions thereof to wear.
  • the present embodiment can be one example of a case where whether or not the compressor body is worn is determined by temperature.
  • FIG. 2 illustrates a perspective view of a package type fluid machine device equipped with a plurality of scroll type compressor bodies, as one example of a fluid machine device 200 .
  • a plurality (here, three) of scroll compressor bodies 201 , 202 , and 203 are housed in one package, and the number of the compressor bodies to be operated is changed according to an air usage amount to deal with a change in air amount.
  • FIG. 6 is an overall conceptual diagram of the fluid machine device 200 of the first embodiment.
  • a package type gas compressor will be described as an example.
  • the package type gas compressor is a gas compressor which includes a motor that is a drive unit to drive a compressor body, and in which a single or a plurality of compressor bodies, a control circuit, an operation panel, and the like are integrally housed in a package to save space.
  • the package type gas compressor includes three stages of compression portions 4 a , 4 b , and 4 c .
  • An electrical wiring 9 is connected to inverters 2 a , 2 b , and 2 c for controlling the compressor bodies and a dryer 14 from a terminal 10 that takes in a power source from the outside.
  • the electrical wiring 9 is connected to motors 3 a , 3 b , and 3 c from the inverters or switches 2 a , 2 b , and 2 c .
  • the compression portions 4 a , 4 b , and 4 c are driven by the motors 3 a , 3 b , and 3 c , respectively.
  • Air 1 to be compressed is supplied through filters 5 a , 5 b , and 5 c , and passes through the compression portions 4 a , 4 b , and 4 c , check valves 6 a , 6 b , and 6 c , first aftercoolers 7 a , 7 b , and 7 c , and rubber hoses 8 a , 8 b , and 8 c , and then is collected in one air line.
  • the rubber hoses 8 a , 8 b , and 8 c are structured to be easily attachable and detachable.
  • a pressure sensor 16 that measures a pressure of compressed air is disposed in a pipe 17 that sends the collected air.
  • the air that has passed through the pipe 17 passes through a second aftercooler 12 , a third aftercooler 13 , and the dryer 14 , and is supplied to the outside as compressed air 90 .
  • the pressure sensor 16 is disposed in the pipe 17 , but it does not matter that the pressure sensor 16 is disposed in another place as long as being capable of measuring pressure in the air line that collects the air compressed by the compression portions 4 a , 4 b , and 4 c.
  • the fluid machine device 200 includes the control unit.
  • the control unit receives temperature and pressure signals from the temperature sensor that measures the temperature of each of the compression portions 4 a , 4 b , and 4 c , and the pressure sensor 16 .
  • the control unit controls the motor that drive the compressor body, or the switch based on information from the temperature sensor or the pressure sensor to control operation start or operation stop of the compressor body.
  • FIG. 3 illustrates an operation example of a fluid machine device equipped with three scroll type compressor bodies A, B, and C.
  • the fluid machine device including a plurality of compressor bodies changes the number of the compressor bodies to be operated based on a transition of a pressure change to be generated by a change in air usage amount.
  • the control unit of the fluid machine device performs control to reduce the number of the compressor bodies to be operated when the air usage amount is small, or to increase the number of the compressor bodies to be operated when the air usage amount is large.
  • the control unit is configured to include a CPU or a microcomputer.
  • the control unit may be formed of a field-programmable gate array (FPGA).
  • FPGA field-programmable gate array
  • an interval from a determination time to the expected reach time Td 304 the lower limit pressure 302 is reached is calculated from a gradient of a pressure change between a measured pressure P(k- 1 ) at one second earlier than the determination time and a measured pressure P(k) at the determination time.
  • an interval from a determination time to the expected reach time Tu 303 the stop pressure 301 is reached is calculated from a gradient of a pressure change between a measured pressure P(k- 1 ) at one second earlier than the determination time and a measured pressure P(k) at the determination time.
  • FIG. 4 is a graph illustrating an example 401 in a normal state and an example 402 in which it is determined that one compressor body A is in a worn state in terms of a pressure transition and operation of three compressor bodies A, B, and C. In a normal state, the three compressor bodies operate in rotation according to a transition of pressure.
  • the control unit receives data on the temperature sent from the temperature sensor 108 , and when the temperature is more than a threshold value, the control unit determines that the compressor body A is worn, and controls the compressor body A to be stopped, and operation is continued with the other compressor bodies.
  • the compressor body A of which wear is detected is stopped, and is set as a spare machine.
  • a rotation is made to change an operating compressor, and the compressor bodies other than the compressor body A operate.
  • the compressor body A at stop is operated as indicated by reference sign 404 , and when the air consumption amount is reduced and pressure rises, the compressor body A having a large wear is first stopped as indicated by reference sign 405 .
  • wear of a compressor body is detected, an alarm is issued, and a user of the compressor body is notified of the wear to prompt maintenance of the compressor body.
  • a stop pressure of the compressor body is set to a pressure 403 lower than those of the other compressor bodies to stop preferentially the compressor body and to reduce a load caused by high pressure, so that operation is continued while reducing a further wear of the compressor body.
  • FIG. 5 is a schematic graph of a pressure transition in the case of lengthening an expected reach time taken to reach a stop pressure at which a stop determination is performed on a compressor body.
  • FIG. 5 is a schematic graph of a pressure transition in the case of lengthening a time Tu to determine that a stop pressure is reached, instead of lowering the stop pressure of a compressor body.
  • the compressor body that is worn can also be stopped in a low pressure state by setting an expected stop pressure reach time Tu′ 501 obtained by lengthening a time to perform a stop determination on the compressor body instead of lowering the stop pressure of the compressor body.
  • FIG. 7 is a conceptual graph of an operation.
  • FIG. 7 illustrates an example in which instead of lengthening an expected reach time taken to reach a stop pressure at which a stop determination is performed as in FIG. 5 , control is performed such that a stop pressure of a compressor body that is worn is lowered more than a stop pressure of a compressor body that is not worn. Since a determination on the stop of the compression body that is worn is performed at a lower pressure than the compressor body that is not worn, temperature to be added to the compressor body can be lowered, and deterioration can be reduced.
  • FIG. 8 is a flowchart illustrating a flow of a stop determination to be performed on pressure machine bodies when wear of the compressor bodies is not determined.
  • the pressure sensor 16 measures pressure at regular intervals, and sends measured pressure data to the control unit, and the control unit acquires a change over time in pressure (step S 81 ).
  • the control unit calculates Tu based on the change over time in pressure, and compares Tu with a threshold value that is determined (step S 82 ).
  • Tu is an expected stop pressure reach time from a reference time (including the time of determination) to when the pressure reaches a stop pressure.
  • step S 82 When Tu calculated in step S 82 is less than the threshold value, the control unit executes control to stop one compressor body having a longest operation time (step S 83 ).
  • FIG. 9 is a flowchart illustrating a flow of a stop determination to be performed on pressure machine bodies when it is determined whether or not there are compressor bodies that are worn.
  • the pressure sensor 16 measures pressure at regular intervals, and sends measured pressure data to the control unit, and the control unit acquires a change over time in pressure (step S 91 ).
  • the control unit calculates Tu based on the change over time in pressure, and compares Tu with a threshold value that is determined (step S 92 ).
  • step S 92 When Tu calculated in step S 92 is less than the threshold value (when pressure is sufficient), the control unit checks whether compressor bodies that are worn are in operation or at stop (step S 93 ).
  • step S 93 When in step S 93 , it is confirmed that the compressor bodies that are worn are in operation, the control unit performs control to stop the operation of the compressor bodies that are worn (step S 94 ).
  • step S 93 When in step S 93 , it is confirmed that all compressor bodies that are worn are at stop, the control unit executes control to stop one compressor body that is not worn and has a longest operation time (step S 95 ).
  • FIG. 10 is a flowchart illustrating a flow of an operation start determination to be performed on pressure machine bodies when wear of the compressor bodies is not determined.
  • the pressure sensor 16 measures pressure at regular intervals, and sends measured pressure data to the control unit, and the control unit acquires a change over time in pressure (step S 101 ).
  • the control unit calculates Td based on the change over time in pressure, and compares Td with a threshold value that is determined (step S 102 ).
  • Td is an expected lower limit pressure reach time from a reference time (including the time of determination) to when the pressure reaches a lower limit pressure.
  • step S 103 the control unit checks whether or not there are compressor bodies at stop.
  • step S 104 the control unit executes control to start operation of a compressor body having a shortest operation time.
  • FIG. 11 is a flowchart illustrating a flow in which the control unit determines operation start of pressure machine bodies when it is determined whether or not there are compressor bodies that are worn.
  • the pressure sensor 16 measures pressure at regular intervals, and sends measured pressure data to the control unit, and the control unit acquires a change over time in pressure (step S 111 ).
  • the control unit obtains Td based on the change over time in pressure, and compares Td with a threshold value that is determined (step S 112 ).
  • step S 112 When Td calculated in step S 112 is less than a threshold value (when pressure is insufficient), it is checked whether or not there are compressor bodies at stop (step S 113 ). When there are the compressor bodies at stop, the control unit checks whether or not the compressor bodies at stop include the compressor bodies that are worn, based on temperature information from the temperature sensor (step S 114 ).
  • control unit executes control to start operation of one compressor body having a shortest operation time among the compressor bodies that are not worn (step S 115 ).
  • step S 114 When in step S 114 , it is confirmed that there is no compressor body at stop other than the compressor bodies that are worn, the control unit executes control to start operation of a compressor body that is worn (step S 116 ).
  • step S 114 When in step S 114 , it is confirmed that only the compressor bodies that are not worn are stopped, similarly to step S 104 of FIG. 10 , the control unit executes control to operate one compressor body having a shortest operation time among the compressor bodies at stop that are not worn.
  • the control unit stores the number of times of determination of the compressor bodies detected as being worn, and when the number of times of determination is more than the specified number of times that is a threshold value for determining wear that is determined, the compressor body is stopped as a failure. In that case, even when a decrease in pressure or the like is detected because of insufficiency of the air supply amount, the compressor body is controlled not to operate. In such a manner, the compressor body is not allowed to stand by as a spare machine, but obtains an opportunity for repair or replacement, so that an abnormality having a large adverse effect such as the compressor body becoming inoperable can be avoided.
  • a compressor body that is detected as being worn among a plurality of compressor bodies is protected. Further, since normally there is a compressor body at stop that is not worn, the operation of the compressor body that is not worn is preferentially started. Therefore, the fluid machine device can be realized which supplies required compressed air to a user.
  • compressor bodies that are worn are compressor bodies at stop, and pressure is insufficient, the operation of the compressor bodies that are worn can be started to supply air of a required pressure to a user.
  • a second embodiment is different from the first embodiment in that the worn state detection unit is a current detector that measures a current of a motor. Namely, regarding a determination of wear, the current detector measures a current value of a motor that drives each compressor body, and when the measured current value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is a current detector that measures a current of a motor. Namely, regarding a determination of wear, the current detector measures a current value of a motor that drives each compressor body, and when the measured current value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the current detector that measures a current of a motor is already provided, there is no need to set a sensor such as a temperature sensor for each compressor body.
  • a third embodiment is different from the first embodiment in that the worn state detection unit is an electric power detector that measures an electric power of a motor. Namely, regarding a determination of wear, the electric power detector measures an input electric power of a motor that drives each compressor body, and when a measured electric power value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is an electric power detector that measures an electric power of a motor. Namely, regarding a determination of wear, the electric power detector measures an input electric power of a motor that drives each compressor body, and when a measured electric power value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the electric power detector that measures an electric power of a motor is already provided, there is no need to set a sensor such as a temperature sensor for each compressor body.
  • a fourth embodiment is different from the first embodiment in that the worn state detection unit is a vibration detector that measures vibration of a compressor body. Namely, regarding a determination of wear, the vibration detector measures vibration of each compressor body, and when a measured vibration value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is a vibration detector that measures vibration of a compressor body. Namely, regarding a determination of wear, the vibration detector measures vibration of each compressor body, and when a measured vibration value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the vibration detector that measures vibration of a compressor is already provided, there is no need to set a sensor such as a temperature sensor for each compressor body.
  • a fifth embodiment is different from the first embodiment in that the worn state detection unit is an air amount detector that measures an amount of a compressor body. Namely, regarding a determination of wear, the air amount detector measures a discharge air amount of each compressor body, and when a measured air amount value is less than a determination value that is determined, it is determined that the air amount is insufficient, and the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is an air amount detector that measures an amount of a compressor body. Namely, regarding a determination of wear, the air amount detector measures a discharge air amount of each compressor body, and when a measured air amount value is less than a determination value that is determined, it is determined that the air amount is insufficient, and the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the air amount detector that measures an air amount of a compressor body is already provided, there is no need to set a sensor such as a temperature sensor for each compressor body.
  • a sixth embodiment is different from the first embodiment in that the worn state detection unit is a noise detector that measures noise of a compressor body. Namely, regarding a determination of wear, the noise detector measures noise of each compressor body, and when a measured noise value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is a noise detector that measures noise of a compressor body. Namely, regarding a determination of wear, the noise detector measures noise of each compressor body, and when a measured noise value is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • the noise detector that measures a noise value of a compressor body is already provided, there is no need to set a sensor such as a temperature sensor for each compressor body.
  • a seventh embodiment is different from the first embodiment in that the worn state detection unit is an operation time detector that measures an operation time of a compressor body. Namely, regarding a determination of wear, the noise detector measures an operation time of each compressor body, and when a measured operation time is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • the worn state detection unit is an operation time detector that measures an operation time of a compressor body. Namely, regarding a determination of wear, the noise detector measures an operation time of each compressor body, and when a measured operation time is more than a determination value that is determined, the control unit performs control to set the compressor body as a spare machine and to stop the compressor body.
  • control unit performs control to operate a compressor body that is determined as being in a worn state only when air amount insufficiency is generated.
  • a compression body that is worn may be set as a spare machine, and operated when the air amount is insufficient. However, the compressor body may be determined as a failure.
  • a second threshold value is provided which is a level that is higher than a first threshold value for determining wear which is determined by temperature, current, input electric power, or the like as described in the first to seventh embodiments, or that can be determined as a failure.
  • the control unit determines that there is an abnormality due to a failure, stops the compressor body as a failure, and performs control not to operate the compressor body even when a decrease in pressure or the like is detected because of insufficiency of the air supply amount.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US17/626,031 2019-10-01 2020-08-27 Fluid Machine Device Pending US20220252065A1 (en)

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JP2019181202A JP2021055648A (ja) 2019-10-01 2019-10-01 流体機械装置
JP2019-181202 2019-10-01
PCT/JP2020/032420 WO2021065266A1 (ja) 2019-10-01 2020-08-27 流体機械装置

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JP2021055648A (ja) 2021-04-08
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CN114127422B (zh) 2023-06-16
EP4039978A4 (en) 2023-09-06

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