WO2024252690A1 - 気体圧縮機 - Google Patents

気体圧縮機 Download PDF

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Publication number
WO2024252690A1
WO2024252690A1 PCT/JP2023/040140 JP2023040140W WO2024252690A1 WO 2024252690 A1 WO2024252690 A1 WO 2024252690A1 JP 2023040140 W JP2023040140 W JP 2023040140W WO 2024252690 A1 WO2024252690 A1 WO 2024252690A1
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WO
WIPO (PCT)
Prior art keywords
drain discharge
drain
pressure sensor
discharge path
gas
Prior art date
Application number
PCT/JP2023/040140
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English (en)
French (fr)
Japanese (ja)
Inventor
笙太郎 佐野
紘太郎 千葉
航平 酒井
将 二階堂
岳廣 松坂
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.)
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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 JP2025525929A priority Critical patent/JPWO2024252690A1/ja
Priority to CN202380090685.0A priority patent/CN120476258A/zh
Publication of WO2024252690A1 publication Critical patent/WO2024252690A1/ja

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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
    • 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
    • F04B39/16—Filtration; Moisture separation
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

  • the present invention relates to a gas compressor.
  • gas compressors in which gas compressed by the compressor body is cooled by a cooler, some are equipped with a mechanism for discharging drainage generated when the compressed gas is cooled. In such gas compressors, if drainage is not properly performed, the drainage will flow into the compressed gas path, causing a deterioration in the quality of the compressed gas.
  • a multi-stage gas compressor that has multiple compressor bodies and compresses gas in a first-stage compressor body and then further compresses it in a second-stage or later compressor body
  • the drainage generated when cooling the compressed gas in the first-stage compressor body is not properly discharged, the drainage will flow into the second-stage or later compressor bodies, causing problems such as damage to the second-stage or later compressor bodies.
  • Patent Document 1 describes a technology for detecting drain discharge failures in gas compressors. It describes that the drain discharge circuit of an air compressor is equipped with a strainer that removes foreign matter mixed into the drain, an on-off valve downstream of the strainer, and a pressure sensor that detects the pressure in the drain piping upstream of the strainer, and that if the pressure detection value detected by the pressure sensor when the on-off valve is open is not lower than the pressure detection value when the on-off valve is closed, it is determined that there is a discharge failure.
  • Patent Document 1 can detect when condensate cannot be discharged due to a blockage in the condensate discharge path downstream of the pressure sensor in the condensate discharge path, for example, in the strainer, on-off valve, or downstream piping, but it cannot determine at which point downstream of the pressure sensor the problem is occurring. Therefore, when a condensate discharge problem is detected, it is necessary to check all possible points that could be the cause.
  • Patent Document 1 does not determine the degree of clogging of the drain discharge path, such as whether the drain discharge path is completely clogged or whether there is a decrease but still space. Therefore, in cases where clogging gradually accumulates in the drain discharge path, it is not possible to address the cause before the drain discharge path becomes completely clogged.
  • the present invention was made in consideration of the above problems, and aims to provide technology that can detect the location and extent of drain discharge abnormalities.
  • one representative gas compressor of the present invention is a gas compressor including a compressor body that compresses gas, a compressed gas cooler that cools the compressed gas compressed by the compressor body, and a drain separator that separates drain from the compressed gas cooled by the compressed gas cooler, and is equipped with a drain discharge path that sends the drain separated by the drain separator to the outside of the gas compressor, a drain discharge valve that is provided in the drain discharge path and opens and closes at predetermined intervals to discharge the separated drain, a drain discharge path pressure sensor that is provided downstream of the drain discharge valve and measures the pressure in the drain discharge path, and a control unit that determines the location and degree of drain discharge abnormality based on the pressure measured by the drain discharge path pressure sensor.
  • the present invention makes it possible to detect the location and extent of drain discharge abnormalities.
  • FIG. 1 is a diagram illustrating an example of a configuration of a two-stage gas compressor according to a first embodiment.
  • FIG. 2 is a diagram showing an example of a detailed configuration of a drain discharge section A in FIG. 1 .
  • 13 is a diagram showing an example of a pressure measured by a drain discharge path pressure sensor when drain is normally discharged.
  • FIG. 13 is a diagram showing an example of a pressure measured by the drain discharge path pressure sensor when a blockage occurs in the drain discharge path upstream of the drain discharge path pressure sensor;
  • FIG. 13 is a diagram showing an example of the pressure measured by the drain discharge path pressure sensor when a complete blockage occurs in the drain discharge path upstream of the drain discharge path pressure sensor;
  • FIG. 11 is a diagram showing an example of a pressure measured by a drain discharge path pressure sensor when a drain discharge valve cannot be completely closed, etc. 13 is a diagram showing an example of pressure measured by the drain discharge path pressure sensor when a blockage occurs in the drain discharge path downstream of the drain discharge path pressure sensor.
  • FIG. 13 is a diagram showing an example of the pressure measured by the drain discharge path pressure sensor when a blockage that makes it difficult to sufficiently discharge occurs in the drain discharge path downstream of the drain discharge path pressure sensor.
  • FIG. 11 is a diagram showing an example of pressure measured by a drain discharge path pressure sensor when a high-pressure fluid enters the drain discharge path; FIG.
  • FIG. 13 is a diagram showing an example of the pressure measured by the drain discharge path pressure sensor when complete clogging occurs in the drain discharge path downstream of the drain discharge path pressure sensor;
  • FIG. 4 is a flowchart illustrating an example of an abnormality detection process executed by a control unit of the two-stage gas compressor.
  • 13 is a flowchart illustrating an example of an upstream recording process.
  • 13 is a flowchart illustrating an example of an upstream side determination process.
  • 13 is a flowchart illustrating an example of a downstream recording process.
  • 13 is a flowchart illustrating an example of a downstream side determination process.
  • FIG. 13 is a diagram showing an example of a yellow alert screen displayed on a monitor.
  • FIG. 13 is a diagram showing an example of a red alert screen displayed on a monitor.
  • FIG. 13 is a diagram showing an example of the pressure measured by the drain discharge path pressure sensor when clogging occurs in both the upstream and downstream sides of the drain discharge path pressure sensor;
  • FIG. 11 is a diagram showing an example of a pressure measured by the drain discharge path pressure sensor when a large amount of drain passes through the drain discharge path pressure sensor;
  • FIG. 11 is a diagram illustrating an example of the configuration of a two-stage gas compressor according to a third embodiment.
  • FIG. 13 is a diagram illustrating an example of the configuration of a two-stage gas compressor according to a fifth embodiment.
  • Example 1 a two-stage gas compressor equipped with two compressor bodies will be described as an example of a multi-stage gas compressor having multiple compressor bodies that compress gas.
  • FIG. 1 is a diagram showing an example of the configuration of a two-stage gas compressor according to the first embodiment.
  • the two-stage gas compressor 100 has an intake port 1 for introducing outside air from the outside, a first-stage low-pressure stage compressor body 3 that first compresses the gas introduced from the outside, a compressed gas cooler 5 that cools the gas compressed by the low-pressure stage compressor body 3, and a drain separator 7 that separates drain from the compressed gas cooled by the compressed gas cooler 5.
  • the two-stage gas compressor 100 also has an intake gas path 2 that sends the gas introduced from the intake port 1 to the low-pressure stage compressor body 3, a compressed gas path 41 that sends the gas compressed in the low-pressure stage compressor body 3 to the compressed gas cooler 5, and a compressed gas path 42 that sends the compressed gas cooled in the compressed gas cooler 5 to the drain separator 7.
  • the low-pressure stage compressor body 3 has, for example, two pairs of screw rotors housed inside a casing, and is an oil-free type that does not contain lubricating oil in the compressed gas path inside the casing, but is not limited to this.
  • the compressed gas cooler 5 is, for example, a water-cooled type that exchanges heat between cooling water and compressed gas, but it may also be cooled using air, etc.
  • the two-stage gas compressor 100 has a second-stage high-pressure stage compressor body 4 that further compresses the gas compressed in the first-stage low-pressure stage compressor body 3, a compressed gas cooler 6 that cools the gas compressed in the high-pressure stage compressor body 4, and a drain separator 8 that separates drain from the compressed gas cooled in the compressed gas cooler 6.
  • the two-stage gas compressor 100 has a compressed gas path 43 that sends the compressed gas from the drain separator 7 to the high-pressure stage compressor main body 4, a compressed gas path 44 that sends the gas compressed in the high-pressure stage compressor main body 4 to the compressed gas cooler 6, a compressed gas path 45 that sends the compressed gas cooled in the compressed gas cooler 6 to the drain separator 8, and a compressed gas path 46 that sends the compressed gas from the drain separator 8 to an outlet outside the gas compressor.
  • the two-stage gas compressor 100 has a drain discharge section A that discharges the drain separated in the drain separator 7 to the outside of the two-stage gas compressor 100, and a drain discharge section B that discharges the drain separated in the drain separator 8 to the outside of the two-stage gas compressor 100.
  • FIG. 2 shows an example of the detailed configuration of the drain discharge section A in FIG. 1.
  • the drain discharge section A has a strainer 65 that removes foreign matter mixed into the drain separated by the drain separator 7, a drain discharge valve 13 that opens and closes at predetermined intervals to discharge the drain from which the foreign matter has been removed by the strainer 65, and an orifice 69 that discharges the drain discharged from the drain discharge valve 13 to the outside of the two-stage gas compressor 100.
  • the drain discharge section A also includes a drain discharge path 71 that sends the drain from the drain separator 7 to the drain discharge valve 13, a drain discharge path 72 that discharges the drain from the drain discharge valve 13 to the outside of the two-stage gas compressor 100, a drain discharge path 75 that bypasses the drain discharge valve 13 from the drain discharge path 71 to the drain discharge path 72, a check valve 63 that is located in the drain discharge path 71 and prevents backflow to the drain separator 7, a three-way valve 64 that is located downstream of the check valve 63 in the drain discharge path 71 and opens one of the path to the drain discharge valve 13 and the path to the drain discharge path 75 and closes the other, and a drain discharge path pressure sensor 17 that is located downstream of the drain discharge valve 13 and measures the pressure in the drain discharge path 72.
  • the drain discharge path pressure sensor 17 indicates a value other than atmospheric pressure when the three-way valve 64 opens the path to the drain discharge valve 13 and the drain discharge valve 13 is open, and indicates the value of atmospheric pressure in other cases.
  • the drain discharge section B has a strainer 68 that removes foreign matter mixed into the drain separated by the drain separator 8, a drain discharge valve 14 that opens and closes at predetermined intervals to discharge the drain from which the foreign matter has been removed by the strainer 68, and an orifice 70 that discharges the drain discharged from the drain discharge valve 14 to the outside of the two-stage gas compressor 100.
  • the drain discharge section B also has a drain discharge path 73 that sends the drain from the drain separator 8 to the drain discharge valve 14, a drain discharge path 74 that discharges the drain from the drain discharge valve 14 to the outside of the two-stage gas compressor 100, a drain discharge path 76 that bypasses the drain discharge valve 14 from the drain discharge path 73 to the drain discharge path 74, a check valve 66 that is in the drain discharge path 73 and prevents backflow to the drain separator 8, a three-way valve 67 that is provided downstream of the check valve 66 in the drain discharge path 73 and opens one of the paths to the drain discharge valve 14 and the drain discharge path 76 and closes the other, and a drain discharge path pressure sensor 18 that is provided downstream of the drain discharge valve 14 and measures the pressure in the drain discharge path 74.
  • the drain discharge path pressure sensor 18 indicates a value other than atmospheric pressure when the three-way valve 67 opens the path to the drain discharge valve 14 and the drain discharge valve 14 is open, and indicates the value of atmospheric pressure in other cases.
  • the two-stage gas compressor 100 has a compressed gas path pressure sensor 19 that measures the pressure in the compressed gas path 43 through which the compressed gas compressed in the low-pressure stage compressor main body 3 passes, a compressed gas path pressure sensor 20 that measures the pressure in the compressed gas path 46 through which the compressed gas compressed in the high-pressure stage compressor main body 4 passes, and an electric motor 9 that receives control commands from the control unit 10 and drives the low-pressure stage compressor main body 3 and the high-pressure stage compressor main body 4.
  • the two-stage gas compressor 100 has a power transmission unit 12 that transmits the power of the electric motor 9 to the low-pressure stage compressor main body 3 and the high-pressure stage compressor main body 4, and a control unit 10 that controls the electric motor 9 and collects data from the drain discharge path pressure sensor 17, the drain discharge path pressure sensor 18, the compressed gas path pressure sensor 19, and the compressed gas path pressure sensor 20.
  • the electric motor 9 is driven by a command from the control unit 10, and power is transmitted from the power transmission unit 12 to the low-pressure stage compressor main body 3 and the high-pressure stage compressor main body 4, and gas is sucked into the two-stage gas compressor 100 from the suction port 1 through the suction gas path 2 and compressed by the low-pressure stage compressor main body 3.
  • the compressed gas passes through the compressed gas path 41 and is sent to the compressed gas cooler 5.
  • the compressed gas becomes hot and is cooled by the compressed gas cooler 5.
  • Cooling causes the water vapor contained in the compressed gas to condense, generating drainage. Therefore, after cooling in the compressed gas cooler 5, the compressed gas and drainage are mixed together. If the compressed gas is supplied downstream in this mixed state, there is a risk of the equipment at the receiving end breaking down, so the drain separator 7 separates the drainage from the compressed gas cooled in the compressed gas cooler 5. By passing through the drain separator 7, the compressed gas is supplied to the high-pressure stage compressor main body 4 with a low moisture content, and the drainage passes through the drain discharge path 72 and is discharged from the drain discharge valve 13.
  • the gas further compressed in the high-pressure stage compressor main body 4 becomes hot, so it is cooled in the compressed gas cooler 6.
  • the compressed gas cooled in the compressed gas cooler 6 is separated into drains by the drain separator 8 and supplied downstream from the compressed gas path 46, and the drains are discharged from the drain discharge valve 14.
  • the drain separator 7 may be of a type that separates the compressed gas and drain through a filter, or a type that separates the compressed gas and drain by centrifugal separation.
  • the drain discharge valves 13 and 14 are controlled to open and close by the control unit 10, and the drain is pushed out by the compressed gas and discharged when the drain discharge valves 13 and 14 are opened.
  • drain discharge valve 13 and the drain discharge valve 14 may be controlled by the control unit 10 to open and close simultaneously, or may be controlled to open and close individually.
  • Possible causes of drainage failure in the compressed gas cooler 5 include clogged strainer 65, malfunction of drainage valve 13, clogged orifice 69, improper construction of drain piping, etc., which can cause drainage to not be discharged properly.
  • drain is generated in the compressed gas cooler 6 as in the compressed gas cooler 5. If drain discharge failure occurs here, it will not directly affect the equipment in the two-stage gas compressor 100, but it will affect downstream equipment connected to the compressed gas path 46. For this reason, a drain discharge section B similar to the drain discharge section A of the compressed gas cooler 5 is provided, but with regard to the drain discharge path of the compressed gas cooler 6, the drain discharge path pressure sensor 18 and the drain discharge abnormality detection process using this, described below, are not necessary if the only purpose is to prevent malfunctions in the two-stage gas compressor 100.
  • the upper graph shows the pressure measured by the drain discharge path pressure sensor 17 with a solid line, and the pressure measured by the compressed gas path pressure sensor 19 with a dotted line.
  • the lower graph shows the timing when the drain discharge valve 13 opens.
  • Figure 3 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when the drain is being discharged normally.
  • the drain discharge valve 13 repeatedly opens and closes.
  • the pressure at the drain discharge path pressure sensor 17 rises to a value below the pressure at the compressed gas path pressure sensor 19 when the drain discharge valve 13 opens, and returns to atmospheric pressure when the drain discharge valve 13 closes.
  • the slope of the waveform of the drain discharge path pressure sensor 17 becomes gentler as it approaches the pressure of the compressed gas path pressure sensor 19, so it can be clearly seen that the time during which the pressure of the drain discharge path pressure sensor 17 is sufficiently close to the pressure of the compressed gas path pressure sensor 19 is shorter than the time during which the drain discharge valve 13 is open (e.g., 2 seconds).
  • the ratio of the value of the drain discharge path pressure sensor 17 to the value of the compressed gas path pressure sensor 19 is within the range when drain is being discharged normally. How close the value of the drain discharge path pressure sensor 17 is to the value of the compressed gas path pressure sensor 19 varies depending on the orifice diameter of the orifice 69, the configuration of the drain discharge path outside the two-stage gas compressor 100, the amount of drain generated, etc.
  • Figure 4 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when a blockage occurs in the drain discharge path upstream of the drain discharge path pressure sensor 17.
  • Figure 5 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when the drain discharge path upstream of the drain discharge path pressure sensor 17 is completely clogged.
  • drain discharge path upstream of the drain discharge path pressure sensor 17 is completely clogged.
  • a complete blockage of the drain discharge path upstream of the drain discharge path pressure sensor 17 would occur, for example, when the drain discharge valve 13 cannot be opened or when the strainer 65 is completely clogged.
  • Figure 6 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when the drain discharge valve 13 does not close completely.
  • Figure 7 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when a blockage occurs in the drain discharge path downstream of the drain discharge path pressure sensor 17.
  • Figure 8 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when a blockage that makes it difficult to sufficiently discharge has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17.
  • Figure 9 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when high-pressure fluid enters the drain discharge path.
  • Figure 10 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when the drain discharge path downstream of the drain discharge path pressure sensor 17 is completely clogged.
  • the value of the drain discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19 regardless of whether the drain discharge valve is open or closed.
  • FIG. 11 is a flowchart showing an example of an abnormality detection process executed by the control unit 10 of the two-stage gas compressor 100.
  • the process in FIG. 11 begins after a predetermined number of seconds have passed since the start of operation of the two-stage gas compressor 100 and drainage has begun to occur, and the process of collecting data, performing calculations, and determining whether drainage has failed in steps S102 to S107 is repeated at specified intervals.
  • the specified intervals are set in advance to be shorter than the time that the drainage valve 13 is open.
  • control unit 10 acquires the pressure values measured by the drain discharge path pressure sensor 17 and the compressed gas path pressure sensor 19 (step S102), and inputs the value of the drain discharge path pressure sensor 17 into variable N1 and the value of the compressed gas path pressure sensor 19 into variable M1 (step S103).
  • step S104 an upstream recording process is executed (step S104) to collect data on the upstream blockage of the drain discharge path pressure sensor 17, and then an upstream determination process is executed (step S105) to determine the presence and extent of blockage of the upstream side of the drain discharge path pressure sensor 17 based on the data collected in step S104.
  • step S106 a downstream recording process is executed (step S106) to collect data on clogging downstream of the drain discharge path pressure sensor 17, and then a downstream determination process is executed (step S107) to determine the presence or absence and the degree of clogging downstream of the drain discharge path pressure sensor 17 based on the data collected in step S106, and the process returns to step S102.
  • upstream processing of steps S104 and S105 may be performed.
  • variables U1, U2, U3, D1, D2, D3, and D4 are used, all with an initial value of 0. These variables act as counters that increment the variables by 1 when certain conditions are met, and reset the values to 0 when certain conditions are met.
  • the variables U1, U2, U3, D1, D2, and D3 may be incremented each time, which indicates that a certain state is continuing.
  • a yellow alert is output when the drain discharge path is clogged but the two-stage gas compressor 100 is operable, and a red alert is output when the operation of the two-stage gas compressor 100 is stopped due to an abnormality in the drain discharge path.
  • FIG. 12 is a flowchart showing an example of the upstream recording process in step S104 of FIG. 11, and FIG. 13 is a flowchart showing an example of the upstream determination process in step S105 of FIG. 11.
  • the processing in Figures 12 and 13 is used to determine whether there is a malfunction upstream of the drain discharge path pressure sensor 17 (the drain discharge path 71 side).
  • the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined first constant smaller than 1, and determines whether the value of N1 is smaller than the value obtained by multiplying the value of M1 by the first constant (step S121).
  • the first constant is set in order to determine whether the value of the drain discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19. "Sufficiently close” means that, as explained in FIG. 3, the ratio of the value of the drain discharge path pressure sensor 17 to the value of the compressed gas path pressure sensor 19 is within the range when the drain is being normally discharged.
  • step S121 If in step S121 the value of N1 is smaller than the value of M1 multiplied by the first constant, 1 is added to variable U1 (step S122) and the process proceeds to step S124. On the other hand, if in step S121 the value of N1 is equal to or greater than the value of M1 multiplied by the first constant, variable U1 is set to 0 (step S123) and the process proceeds to step S124. As a result, if variable U1 is added when drain discharge valve 13 is closed, and the value of drain discharge path pressure sensor 17 rises sufficiently when drain discharge valve 13 opens, it will not be determined as an abnormality.
  • control unit 10 compares the value of N1 with the maximum value of the measurement error of the drain discharge path pressure sensor 17, and determines whether the value of N1 is smaller than the maximum value of the measurement error of the drain discharge path pressure sensor 17 (step S124).
  • the waveform of the drain discharge line pressure sensor 17 will not rise above atmospheric pressure or will rise only slightly, and it can be inferred that a complete blockage has occurred in the drain discharge line upstream of the drain discharge line pressure sensor 17.
  • step S124 If, in step S124, the value of N1 is less than the maximum value of the measurement error of the drain discharge path pressure sensor 17, 1 is added to the variable U2 (step S125), and the process proceeds to step S127. On the other hand, if, in step S124, the value of N1 is greater than or equal to the maximum value of the measurement error of the drain discharge path pressure sensor 17, the variable U2 is set to 0 (step S126), and the process proceeds to step S127.
  • the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a second predetermined constant smaller than 1, and determines whether the value of N1 is greater than the value obtained by multiplying the value of M1 by a second predetermined constant smaller than 1 (step S127).
  • the second constant is set to a value smaller than 1 and higher than 0 so that the value obtained by multiplying the value of M1 by the second constant is greater than the atmospheric pressure.
  • step S127 If, in step S127, the value of N1 is greater than the value of M1 multiplied by the second constant, 1 is added to variable U3 (step S128), and the process ends. On the other hand, if, in step S127, the value of N1 is equal to or less than the value of M1 multiplied by the second constant, variable U3 is set to 0 (step S129), and the process ends.
  • control unit 10 determines whether the value of the variable U1 exceeds a specified number of times (step S132).
  • the specified number of times is set to a value that is at least greater than the number of times the process of FIG. 11 is repeated between the opening of the drain discharge valve 13 and the next opening of the drain discharge valve 13.
  • step S132 If the value of variable U1 exceeds the specified number of times in step S132, as shown in FIG. 4, it is determined that the value of the drain discharge path pressure sensor 17 is not sufficiently close to the value of the compressed gas path pressure sensor 19 when the drain discharge valve 13 opens, and there is a blockage in the drain discharge path upstream of the drain discharge path pressure sensor 17, and a yellow alert is output (step S133), and the process proceeds to step S134. On the other hand, if the value of variable U1 exceeds the specified number of times in step S132, the process proceeds to step S134.
  • control unit 10 determines whether the value of variable U2 exceeds a specified number of times (step S134).
  • step S134 the value of variable U2 exceeds the specified number of times, as shown in FIG. 5, the waveform of the drain discharge path pressure sensor 17 shows no or very little increase from atmospheric pressure, and it is determined that there is a complete blockage in the drain discharge path upstream of the drain discharge path pressure sensor 17, a red alert is output (step S135), and the process proceeds to step S136.
  • step S134 the value of variable U2 does not exceed the specified number of times, the process proceeds to step S136.
  • control unit 10 determines whether the value of variable U3 exceeds a specified number of times (step S136).
  • variable U3 exceeds the specified number of times in step S136, as shown in FIG. 6, regardless of whether drain discharge valve 13 is open or closed, the waveform of drain discharge path pressure sensor 17 always exceeds atmospheric pressure, it is determined that drain discharge valve 13 is not completely closed, a yellow alert is output (step S137), and the process ends. On the other hand, if the value of variable U3 does not exceed the specified number of times in step S136, the process ends.
  • step S137 In order to distinguish from downstream discharge abnormalities determined in step S157 of FIG. 15 described later, it is preferable that the specified number of times of step S137 is sufficiently longer than the specified number of times of step S157.
  • drain discharge path upstream of the drain discharge path pressure sensor 17 If the drain discharge path upstream of the drain discharge path pressure sensor 17 is completely clogged, it is not possible to determine whether the downstream drain discharge path is normal or not. Therefore, if a red alert is output indicating complete clog on the upstream side, the downstream side is also checked for clogs.
  • FIG. 14 is a flowchart showing an example of the downstream recording process in step S106 of FIG. 11, and FIG. 15 is a flowchart showing an example of the downstream determination process in step S107 of FIG. 11.
  • the processing in Figures 14 and 15 is used to determine whether there is a malfunction downstream of the drain discharge path pressure sensor 17 (the drain discharge path 72 side).
  • control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a third constant that is greater than 1, and determines whether the value of N1 is greater than the value obtained by multiplying the value of M1 by the third constant (step S140).
  • the third constant is set to a value greater than 1 so that it can be determined that the value of N1 is clearly greater than the value of M2.
  • the pressure measured by the drain discharge path pressure sensor 17 when the drain discharge valve 13 is open is clearly higher than the pressure measured by the compressed gas path pressure sensor 19, and it can be inferred that high-pressure fluid is flowing back into the drain discharge path 72 from a path external to the two-stage gas compressor 100 that has a higher pressure than the pressure of the drain discharge path pressure sensor 17.
  • step S140 If, in step S140, the value of N1 is greater than the value of M1 multiplied by the third constant, 1 is added to variable D1 (step S141) and the process proceeds to step S143. On the other hand, if, in step S140, the value of N1 is less than or equal to the value of M1 multiplied by the third constant, variable D1 is set to 0 (step S142) and the process proceeds to step S143.
  • control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined first constant that is smaller than 1, and determines whether the value of N1 is greater than the value obtained by multiplying the value of M1 by a predetermined first constant that is smaller than 1 (step S143).
  • the value of the drain discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19, and it can be inferred that a complete blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17.
  • step S143 If, in step S143, the value of N1 is greater than the value obtained by multiplying the value of M1 by a first predetermined constant that is less than 1, 1 is added to variable D2 (step S144) and the process proceeds to step S146. On the other hand, if, in step S143, the value of N1 is equal to or less than the value obtained by multiplying the value of M1 by a first predetermined constant that is less than 1, variable D2 is set to 0 (step S145) and the process proceeds to step S148.
  • control unit 10 determines whether the variable D2 is equal to a specified number of times (step S146). This specified number of times is set to a value that is less than the number of times the process of FIG. 11 is repeated while the drain discharge valve 13 is open, and that will not cause the variable D2 to reach the specified number of times while the drain is being discharged normally.
  • step S146 If, in step S146, variable D2 is equal to the specified number of times, 1 is added to variable D4 (step S147), and the process proceeds to step S148. On the other hand, if, in step S146, variable D2 is not equal to the specified number of times, the process proceeds to step S148.
  • variable D2 is equal to the specified number of times. If the state in which variable D2 is equal to the specified number of times continues, as shown in FIG. 7, the time during which the value of the drain discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 is long, approaching the time during which the drain discharge valve 13 is open, and it can be inferred that a blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17.
  • This process is performed to detect a state in which the pressure at the drain discharge path pressure sensor 17 increases suddenly due to a narrowing of the drain discharge path downstream of the drain discharge path pressure sensor 17, but when the drain discharge valve 13 closes, the pressure starts to decrease.
  • Clogs in the drain discharge path upstream of the drain discharge path pressure sensor 17 can be determined by observing for a specified period of time that the value of the drain discharge path pressure sensor 17 is lower than normal.
  • the waveform of the drain discharge path pressure sensor 17 rises sharply when the drain discharge valve 13 opens, and returns to near atmospheric pressure when the drain discharge valve 13 closes, so it is necessary to observe the sudden rise in the value of the drain discharge path pressure sensor 17 multiple times. For this reason, it is appropriate to use the variable D4 as described above, and add 1 to variable D4 only when variable D2 has reached a specified number of times.
  • variable D4 may not be used and a yellow alert may be output when D2 exceeds a specified number of times.
  • the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a second constant that is smaller than 1 and is determined in advance, and determines whether the value of N1 is greater than the value obtained by multiplying the value of M1 by the second constant (step S148).
  • the second constant is set to a value smaller than 1 and higher than 0 so that the value obtained by multiplying the value of M1 by the second constant is greater than the atmospheric pressure.
  • variable D2 is equal to the specified number of times
  • the value of N1 is greater than the value of M1 multiplied by a predetermined second constant smaller than 1
  • the value of the drain discharge path pressure sensor 17 has been sufficiently close to the value of the compressed gas path pressure sensor 19 for a long time, approaching the time when the drain discharge valve 13 is open, and the value of the drain discharge path pressure sensor 17 always exceeds atmospheric pressure regardless of whether the drain discharge valve 13 is open or closed, and it can be inferred that a blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17 that makes it difficult to sufficiently discharge the drain.
  • step S148 If, in step S148, the value of N1 is greater than the value of M1 multiplied by the second constant, 1 is added to variable D3 (step S149), and the process ends. On the other hand, if, in step S148, the value of N1 is equal to or less than the value of M1 multiplied by the second constant, variable D3 is set to 0 (step S150), and the process ends.
  • control unit 10 determines whether the value of variable D1 exceeds 1 (step S153).
  • step S153 If the value of variable D1 exceeds 1 in step S153, as shown in FIG. 9, the pressure measured by drain discharge path pressure sensor 17 when drain discharge valve 13 is opened is clearly higher than the pressure measured by compressed gas path pressure sensor 19, and it is determined that high-pressure fluid is flowing back into drain discharge path 72 from a path outside two-stage gas compressor 100 having a higher pressure than the pressure of drain discharge path pressure sensor 17, and a red alert is output (step S154), and the process proceeds to step S155. On the other hand, if the value of variable D1 does not exceed 1 in step S153, the process proceeds to step S155.
  • control unit 10 determines whether the value of variable D4 exceeds a specified number of times (step S155). This specified number of times is set to a value of 2 or more.
  • step S155 If the value of variable D4 exceeds the specified number of times in step S155, as shown in FIG. 7, the time during which the value of the drain discharge path pressure sensor 17 has been sufficiently close to the value of the compressed gas path pressure sensor 19 is long, and the time during which the drain discharge valve 13 is close to being open is approaching, and it is determined that a blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17, a yellow alert is output (step S156), and the process proceeds to step S157. On the other hand, if the value of variable D4 does not exceed the specified number of times in step S155, the process proceeds to step S159.
  • step S157 the control unit 10 determines whether the value of the variable D3 exceeds a specified number of times. This specified number of times is set to a value that is at least greater than the number of times the process in FIG. 11 is repeated between the opening of the drain discharge valve 13 and the next opening of the drain discharge valve 13.
  • step S157 If the value of variable D3 exceeds the specified number of times in step S157, as shown in FIG. 8, the time during which the value of the drain discharge path pressure sensor 17 has been sufficiently close to the value of the compressed gas path pressure sensor 19 has been long, and is approaching the time during which the drain discharge valve 13 is open. In addition, regardless of whether the drain discharge valve 13 is open or closed, the value of the drain discharge path pressure sensor 17 always exceeds atmospheric pressure. It is determined that a blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17 that makes it difficult to sufficiently discharge the drain, a red alert is output (step S158), and the process proceeds to step S159. On the other hand, if the value of variable D3 does not exceed the specified number of times in step S157, the process proceeds to step S159.
  • step S159 the control unit 10 determines whether the value of variable D2 exceeds a specified number of times.
  • step S159 If the value of variable D2 exceeds the specified number of times in step S159, as shown in FIG. 10, it is determined that the value of the drain discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19 regardless of whether the drain discharge valve is open or closed, and a complete blockage has occurred in the drain discharge path downstream of the drain discharge path pressure sensor 17, a red alert is output (step S160), and the process ends. On the other hand, if the value of variable D2 exceeds the specified number of times in step S159, the process ends.
  • FIG. 16 shows an example of a yellow alert screen displayed on monitor 98
  • FIG. 17 shows an example of a red alert screen displayed on monitor 98.
  • the yellow alert in Figure 16 is output when the drain discharge path is clogged but the two-stage gas compressor 100 is operable.
  • the yellow alert shows the location where the clog has occurred.
  • the red alert in FIG. 17 is output when the operation of the two-stage gas compressor 100 is stopped due to an abnormality in the drain discharge path.
  • the red alert the location of the blockage and the fact that drain cannot be discharged are clearly displayed on the monitor, and the control unit 10 stops the operation of the two-stage gas compressor 100.
  • the drain discharge valve 13 opens and closes at a predetermined interval, and the control unit 10 determines the location and extent of the drain discharge abnormality based on the waveform of the drain discharge path pressure sensor 17 that measures the pressure in the drain discharge path 72, thereby making it possible to detect the location and extent of the drain discharge abnormality.
  • Example 2 The configuration of the two-stage gas compressor in Example 2 is the same as that in Example 1.
  • Example 2 the waveform of the drain discharge path pressure sensor 17 shown in Figures 3 to 10 is displayed on the monitor 98, allowing the operator to check in detail the location and extent of the blockage in the drain discharge path.
  • Example 1 if a yellow alert is output due to a blockage upstream of the drain discharge path pressure sensor 17, there are two possible cases where the detailed state of the drain discharge path cannot be determined using the abnormality detection process in FIG. 11. In Example 2, this can be confirmed from the waveform of the drain discharge path pressure sensor 17 displayed on the monitor 98.
  • the first pattern is when both the upstream and downstream of the drain discharge path pressure sensor 17 are clogged, but the fluid can pass through the piping.
  • a yellow alert is output, indicating that there is a clog in the drain discharge path upstream of the drain discharge path pressure sensor 17.
  • a waveform like that shown in FIG. 18 is displayed on the monitor 98.
  • FIG. 18 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when blockages occur in both the upstream and downstream drain discharge paths of the drain discharge path pressure sensor 17.
  • the value of the drain discharge path pressure sensor 17 does not increase until it is determined that the drain is being normally discharged. Also, the pressure of the drain discharge path pressure sensor 17 and the pressure of the compressed gas path pressure sensor 19 are sufficiently close to each other for a long time.
  • the second pattern is when the drain discharge path is not clogged, but a large amount of drain passes through the drain discharge path pressure sensor 17.
  • a large amount of drain passes through the drain discharge path pressure sensor 17.
  • a waveform like that shown in FIG. 19 is displayed on the monitor 98.
  • Figure 19 shows an example of the pressure measured by the drain discharge path pressure sensor 17 when a large amount of drain passes through the drain discharge path pressure sensor 17.
  • the second pattern occurs when, for example, the surroundings of the two-stage gas compressor 100 are hot and humid, resulting in the generation of a large amount of drain.
  • the drain discharge valve 13 may be open for a short period of time, and this can be addressed by changing the setting to lengthen this time.
  • the waveform of the drain discharge path pressure sensor 17 is displayed on the monitor 98, allowing the operator to check in detail the location and extent of the blockage in the drain discharge path.
  • Example 3 is similar to Example 1 in that it executes the anomaly detection process shown in FIG. 11.
  • FIG. 20 is a diagram showing an example of the configuration of a two-stage gas compressor 100 according to the third embodiment.
  • the two-stage gas compressor 100 in FIG. 20 differs from FIG. 1 only in that it has a temperature sensor 77 and a humidity sensor 78 in the intake port 1 through which outside air is introduced.
  • the same components as in FIG. 1 are given the same reference numerals and their explanations are omitted.
  • the temperature sensor 77 and humidity sensor 78 measure the temperature and humidity, respectively, of the outside air introduced from outside through the air intake 1.
  • the first constant used in the abnormality detection process is made variable depending on the values measured by the temperature sensor 77 and the humidity sensor 78.
  • the amount of drainage generated can be estimated from the temperature and humidity of the outside air introduced from the outside, and the constant used to determine the state of the drainage discharge path is changed according to the behavior when a large amount of drainage is generated and the behavior when very little drainage is generated. For example, when the outside air is hot and humid, it is estimated that a large amount of drain will flow, and in this case, the value of the drain discharge path pressure sensor 17 may not increase more than usual. Therefore, by lowering the first constant used when determining whether there is a blockage on the upstream side of the drain discharge path pressure sensor 17, it is possible to prevent a false determination that there is a blockage on the upstream side.
  • the third embodiment by changing the constants used in the abnormality detection process based on the outside air temperature and humidity, it becomes possible to judge drain discharge abnormalities according to the amount of drain generated, thereby reducing the occurrence rate of erroneous judgments
  • Example 4 is similar to Example 1 in that the location and extent of the blockage in the drain discharge path is determined from the waveform of the drain discharge path pressure sensor 17, but the abnormality detection process of FIG. 11 is not executed. Instead, the location and extent of the blockage is determined from the waveform of the drain discharge path pressure sensor 17 displayed on the monitor 98 by waveform judgment using machine learning, and an alert is displayed on the monitor 98 according to the settings.
  • This waveform determination does not need to be performed constantly; it can be performed based on the waveform shape at set time intervals, or at any timing.
  • the location and degree of drain discharge abnormality can be detected from the complex waveform pattern of the drain discharge path pressure sensor 17 without the need for operator confirmation.
  • Example 5 is similar to Example 1 in that it executes the anomaly detection process shown in FIG. 11.
  • FIG. 21 is a diagram showing an example of the configuration of a two-stage gas compressor 100 according to a fifth embodiment.
  • the two-stage gas compressor 100 in FIG. 21 differs from FIG. 1 only in that it has an antenna 99 that allows communication from the control unit 10 to the outside.
  • the same components as in FIG. 1 are given the same reference numerals and their explanations are omitted.
  • the results of the abnormality detection process in FIG. 11 that is detected as an abnormality in the drain discharge path are transmitted to an external device via an antenna 99. This allows the person in charge of maintenance of the two-stage gas compressor 100 to be notified of the abnormality in the drain discharge path and to take immediate action.
  • the two-stage gas compressor 100 has a function of notifying the outside of the location and the degree of the drain discharge abnormality, so that the location and the degree of the drain discharge abnormality can be notified to an operator at an early stage. This makes it possible to prepare the necessary measures and parts to be replaced earlier depending on the location and the degree of the drain discharge abnormality, and to deal with the drain discharge abnormality.
  • the present invention is not limited to the above-described embodiments, but includes various modified examples.
  • the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
PCT/JP2023/040140 2023-06-07 2023-11-08 気体圧縮機 WO2024252690A1 (ja)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097444A (ja) * 2001-09-20 2003-04-03 Hitachi Ltd 凝縮水排出装置及びそれを備えた油冷式圧縮機
JP2009041459A (ja) * 2007-08-09 2009-02-26 Orion Mach Co Ltd ドレン排出異常の検出装置および圧縮空気除湿装置
JP2014145325A (ja) 2013-01-30 2014-08-14 Hitachi Industrial Equipment Systems Co Ltd 空気圧縮機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097444A (ja) * 2001-09-20 2003-04-03 Hitachi Ltd 凝縮水排出装置及びそれを備えた油冷式圧縮機
JP2009041459A (ja) * 2007-08-09 2009-02-26 Orion Mach Co Ltd ドレン排出異常の検出装置および圧縮空気除湿装置
JP2014145325A (ja) 2013-01-30 2014-08-14 Hitachi Industrial Equipment Systems Co Ltd 空気圧縮機

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