Gas compressor

Abstract

The present invention provides a technique for detecting the position and degree of a condensate water discharge abnormality. A two-stage gas compressor (100) is provided with: a low-pressure-stage compressor body (3) that compresses gas; a compressed gas cooler (5) for cooling the compressed gas compressed by the low-pressure-stage compressor main body (3); a condensate water separator (7) for separating condensate water from the compressed gas cooled by the compressed gas cooler (5); condensate water discharge paths (71, 72) for conveying the condensate water separated by the condensate water separator (7) to the outside of the secondary gas compressor (100); a condensed water discharge valve (13) that opens and closes at a predetermined interval and discharges the separated condensed water; a condensed water discharge path pressure sensor (17) which is provided downstream of the condensed water discharge valve (13) and measures the pressure in the condensed water discharge path (72); and a control unit (10) that determines the position and degree of discharge abnormality of the condensed water on the basis of the pressure measured by the condensed water discharge path pressure sensor (17).

Description

Technical Field

[0001] The present invention relates to a gas compressor. Background Art

[0002] Among gas compressors that use a cooler to cool gas compressed by a compressor body, some include a mechanism for discharging condensed water generated during cooling of the compressed gas. Such gas compressors have a problem: if condensed water cannot be properly discharged, the condensed water flows into the compressed gas passage, degrading the quality of the compressed gas.

[0003] In addition, especially in a multi-stage gas compressor having multiple compressor bodies, in which the gas compressed by the first-stage compressor body is further compressed by the second-stage and subsequent compressor bodies, when the condensed water generated when the first-stage compressor body cools the compressed gas cannot be discharged normally, the condensed water flows into the second-stage and subsequent compressor bodies, causing problems such as damage to the second-stage and subsequent compressor bodies.

[0004] Patent Document 1 describes a technique for detecting condensate discharge failure in a gas compressor. The technique describes a condensate discharge circuit for an air compressor comprising: a strainer that removes foreign matter from the condensate; an on-off valve located downstream of the strainer; and a pressure sensor located upstream of the strainer to detect the pressure within the condensate piping. A discharge failure is determined if the pressure value detected by the pressure sensor when the on-off valve is open does not decrease compared to the pressure value detected when the on-off valve is closed.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-145325 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] The technology of Patent Document 1 can detect condensate discharge failure due to blockage or other reasons at locations downstream of the pressure sensor in the condensate discharge path, such as a strainer, an on-off valve, or downstream piping. However, it cannot determine the location downstream of the pressure sensor where the problem has occurred. Therefore, when condensate discharge failure is detected, all possible locations that could be the cause must be identified.

[0010] Furthermore, the technology of Patent Document 1 does not determine the degree of blockage in the condensed water discharge path, such as whether the path is completely blocked or only slightly blocked but still has some space. Therefore, if the blockage in the condensed water discharge path gradually accumulates, it is impossible to take action to address the cause before the path becomes completely blocked.

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a technology capable of detecting the position and extent of abnormality in condensed water discharge.

[0012] Technical solutions to problems

[0013] In order to solve the above-mentioned problems, one of the representative gas compressors of the present invention includes: a compressor body for compressing gas; a compressed gas cooler for cooling the compressed gas compressed by the compressor body; and a condensate separator for separating condensate from the compressed gas cooled by the compressed gas cooler. In this gas compressor, it includes: a condensate discharge path, which transports the condensate separated by the condensate separator to the outside of the gas compressor; a condensate discharge valve, which is arranged in the condensate discharge path and opens and closes at predetermined intervals to discharge the separated condensate; a condensate discharge path pressure sensor, which measures the pressure in the condensate discharge path arranged downstream of the condensate discharge valve; and a control unit, which determines the location and degree of condensate discharge abnormality based on the pressure measured by the condensate discharge path pressure sensor.

[0014] Effects of the Invention

[0015] According to the present invention, the position and extent of condensed water discharge abnormality can be detected.

[0016] Other problems, structures, and effects than those described above will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing an example of the structure of the two-stage gas compressor of Example 1.

[0018] Figure 2 Yes Figure 1 FIG. 1 is a diagram showing an example of a detailed structure of a condensed water discharge portion A.

[0019] Figure 3 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water is discharged normally.

[0020] Figure 4 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water discharge path upstream of the condensed water discharge path pressure sensor is clogged.

[0021] Figure 5 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water discharge path on the upstream side of the condensed water discharge path pressure sensor is completely blocked.

[0022] Figure 6 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water discharge valve cannot be completely closed.

[0023] Figure 7 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor is clogged.

[0024] Figure 8 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when clogging occurs in the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor, making sufficient discharge difficult.

[0025] Figure 9 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when high-pressure fluid enters the condensed water discharge path.

[0026] Figure 10 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor is completely blocked.

[0027] Figure 11 This is a flowchart showing an example of abnormality detection processing executed by the control unit of the two-stage gas compressor.

[0028] Figure 12 This is a flowchart showing an example of upstream recording processing.

[0029] Figure 13 This is a flowchart showing an example of upstream-side determination processing.

[0030] Figure 14 This is a flowchart showing an example of downstream recording processing.

[0031] Figure 15 This is a flowchart showing an example of downstream side determination processing.

[0032] Figure 16 This is a diagram showing an example of a yellow alarm screen displayed on a monitor.

[0033] Figure 17 This is a diagram showing an example of a red alert screen displayed on a monitor.

[0034] Figure 18This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when both the condensed water discharge paths upstream and downstream of the condensed water discharge path pressure sensor are clogged.

[0035] Figure 19 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor when a large amount of condensed water passes through the condensed water discharge path pressure sensor.

[0036] Figure 20 This is a diagram showing an example of the structure of a two-stage gas compressor according to the third embodiment.

[0037] Figure 21 This is a diagram showing an example of the structure of a two-stage gas compressor of Example 5. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments will be described using the drawings.

[0039] Example 1

[0040] In the first embodiment, a two-stage gas compressor including two compressor bodies among a multi-stage gas compressor having a plurality of compressor bodies for compressing gas will be described as an example.

[0041] Figure 1 This is a diagram showing an example of the structure of the two-stage gas compressor of Example 1.

[0042] The two-stage gas compressor 100 comprises: an intake port 1 for introducing external air from the outside; a first-stage low-pressure 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 compressor body 3; and a condensed water separator 7 that separates condensed water from the compressed gas cooled by the compressed gas cooler 5.

[0043] In addition, the two-stage gas compressor 100 has: an intake gas path 2 that transports the gas introduced from the intake port 1 to the low-pressure stage compressor body 3; a compressed gas path 41 that transports the gas compressed by the low-pressure stage compressor body 3 to the compressed gas cooler 5; and a compressed gas path 42 that transports the compressed gas cooled by the compressed gas cooler 5 to the condensate separator 7.

[0044] The low-pressure stage compressor body 3 includes, for example, two pairs of screw rotors housed in a casing and has an oil-free structure in which the compressed gas path in the casing does not contain lubricating oil, but is not limited thereto.

[0045] The compressed gas cooler 5 is, for example, a water-cooled cooler that performs heat exchange between cooling water and compressed gas, but may also be a cooler utilizing air or the like.

[0046] Furthermore, the two-stage gas compressor 100 also has: a second-stage high-pressure compressor body 4 that further compresses the gas compressed by the first-stage low-pressure compressor body 3; a compressed gas cooler 6 that cools the gas compressed by the high-pressure compressor body 4; and a condensed water separator 8 that separates condensed water from the compressed gas cooled by the compressed gas cooler 6.

[0047] Furthermore, the two-stage gas compressor 100 also has: a compressed gas path 43 for transporting compressed gas from the condensate separator 7 to the high-pressure stage compressor body 4; a compressed gas path 44 for transporting the gas compressed by the high-pressure stage compressor body 4 to the compressed gas cooler 6; a compressed gas path 45 for transporting the compressed gas cooled by the compressed gas cooler 6 to the condensate separator 8; and a compressed gas path 46 for transporting the compressed gas from the condensate separator 8 to an outlet outside the gas compressor.

[0048] Furthermore, the two-stage gas compressor 100 further includes: a condensed water discharge portion A for discharging the condensed water separated by the condensed water separator 7 to the outside of the two-stage gas compressor 100; and a condensed water discharge portion B for discharging the condensed water separated by the condensed water separator 8 to the outside of the two-stage gas compressor 100.

[0049] Figure 2 Yes Figure 1 FIG. 1 is a diagram showing an example of a detailed structure of a condensed water discharge portion A.

[0050] The condensed water discharge section A includes: a coarse filter 65 for removing foreign matter mixed in the condensed water separated by the condensed water separator 7; a condensed water discharge valve 13 that opens and closes at predetermined intervals to discharge the condensed water from which foreign matter has been removed by the coarse filter 65; and an orifice (throttling hole) 69 that discharges the condensed water discharged from the condensed water discharge valve 13 to the outside of the secondary gas compressor 100.

[0051] In addition, the condensate discharge part A has: a condensate discharge path 71 that transports condensate from the condensate separator 7 to the condensate discharge valve 13; a condensate discharge path 72 that discharges condensate from the condensate discharge valve 13 to the outside of the two-stage gas compressor 100; a condensate discharge path 75 that is a path from the condensate discharge path 71 to the condensate discharge path 72 that bypasses the condensate discharge valve 13; a check valve 63 located in the condensate discharge path 71 to prevent backflow to the condensate separator 7; a three-way valve 64 that is arranged at a position downstream of the check valve 63 in the condensate discharge path 71 and opens one of the paths to the condensate discharge valve 13 and the path to the condensate discharge path 75 and closes the other; and a condensate discharge path pressure sensor 17 that is arranged at a position downstream of the condensate discharge valve 13 and measures the pressure in the condensate discharge path 72.

[0052] The condensed water discharge path pressure sensor 17 displays a value other than atmospheric pressure when the three-way valve 64 opens the path to the condensed water discharge valve 13 and the condensed water discharge valve 13 is open. Otherwise, it displays a value of atmospheric pressure.

[0053] return Figure 1 The condensed water discharge portion B includes: a coarse filter 68 for removing foreign matter mixed in the condensed water separated by the condensed water separator 8; a condensed water discharge valve 14 that opens and closes at predetermined intervals to discharge the condensed water from which foreign matter has been removed by the coarse filter 68; and an orifice 70 for discharging the condensed water discharged from the condensed water discharge valve 14 to the outside of the secondary gas compressor 100.

[0054] In addition, the condensate discharge part B has: a condensate discharge path 73 that transports condensate from the condensate separator 8 to the condensate discharge valve 14; a condensate discharge path 74 that discharges condensate from the condensate discharge valve 14 to the outside of the two-stage gas compressor 100; a condensate discharge path 76 that is a path from the condensate discharge path 73 to the condensate discharge path 74 that bypasses the condensate discharge valve 14; a check valve 66 located in the condensate discharge path 73 to prevent backflow to the condensate separator 8; a three-way valve 67 that is arranged at a position downstream of the check valve 66 in the condensate discharge path 73 to open one of the paths to the condensate discharge valve 14 and the path to the condensate discharge path 76 and close the other; and a condensate discharge path pressure sensor 18 that is arranged at a position downstream of the condensate discharge valve 14 to measure the pressure in the condensate discharge path 74.

[0055] The condensed water discharge path pressure sensor 18 displays a value other than atmospheric pressure when the three-way valve 67 opens the path to the condensed water discharge valve 14 and the condensed water discharge valve 14 is open. Otherwise, it displays a value of atmospheric pressure.

[0056] Furthermore, the two-stage gas compressor 100 also has: a compressed gas path pressure sensor 19 for measuring the pressure in the compressed gas path 43 through which the compressed gas compressed by the low-pressure stage compressor body 3 passes; a compressed gas path pressure sensor 20 for measuring the pressure in the compressed gas path 46 through which the compressed gas compressed by the high-pressure stage compressor body 4 passes; and an electric motor 9 for driving the low-pressure stage compressor body 3 and the high-pressure stage compressor body 4 by receiving control instructions from the control unit 10.

[0057] Furthermore, the two-stage gas compressor 100 also has: a power transmission unit 12 that transmits the power of the motor 9 to the low-pressure stage compressor body 3 and the high-pressure stage compressor body 4; and a control unit 10 that controls the motor 9 and collects data from the condensate discharge path pressure sensor 17, the condensate discharge path pressure sensor 18, the compressed gas path pressure sensor 19 and the compressed gas path pressure sensor 20.

[0058] use Figure 1 An example of the flow from gas compression to condensed water discharge in the two-stage gas compressor 100 will be described.

[0059] When the two-stage gas compressor 100 begins operating, the motor 9 is driven according to a command from the control unit 10. Power is transmitted from the power transmission unit 12 to the low-pressure stage compressor body 3 and the high-pressure stage compressor body 4. Gas is drawn 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 body 3. The compressed gas is then transported to the compressed gas cooler 5 via the compressed gas path 41. The compressed gas reaches a high temperature and is therefore cooled by the compressed gas cooler 5.

[0060] During cooling, water vapor contained in the compressed gas condenses, producing condensed water. Therefore, after being cooled by the compressed gas cooler 5, compressed gas and condensed water coexist. Supplying the compressed gas downstream while maintaining these coexistences can cause equipment failure at the destination. Therefore, the condensed water separator 7 separates the condensed water from the compressed gas cooled by the compressed gas cooler 5. Passing through the condensed water separator 7, the compressed gas is supplied to the high-pressure stage compressor body 4 with a reduced water content. The condensed water is then discharged from the condensed water discharge valve 13 via the condensed water discharge path 72.

[0061] The temperature of the gas further compressed by the high-pressure stage compressor body 4 increases, so it is cooled by the compressed gas cooler 6. The compressed gas cooled by the compressed gas cooler 6 passes through the condensed water separator 8 to separate the condensed water in the compressed gas, and is supplied to the downstream side through the compressed gas path 46. The condensed water is discharged from the condensed water discharge valve 14.

[0062] Condensate separator 7 can be a method for separating compressed gas and condensed water using a filter or a method for separating compressed gas and condensed water using centrifugal separation. Condensate discharge valves 13 and 14 are controlled by control unit 10 for opening and closing. When condensed water discharge valves 13 and 14 are open, condensed water is squeezed out by the compressed gas and discharged.

[0063] Here, the condensed water discharge valve 13 and the condensed water discharge valve 14 may be controlled by the control unit 10 so as to be opened and closed simultaneously, or may be controlled so as to be opened and closed independently.

[0064] In the above-described configuration, for example, if condensed water generated in the compressed gas cooler 5 is poorly discharged, the condensed water generated in the compressed gas cooler 5 is drawn into the high-pressure stage compressor body 4 along with the compressed gas. When the condensed water flows into the high-pressure stage compressor body 4, it promotes rust formation within the high-pressure stage compressor body 4. This rust increases the possibility of causing a problem in the high-pressure stage compressor body 4, causing the high-pressure stage compressor body 4 to malfunction.

[0065] Poor discharge of condensed water generated in the compressed gas cooler 5 may be caused by clogging of the strainer 65, malfunction of the condensed water discharge valve 13, clogging of the orifice 69, or poor construction of the condensed water piping.

[0066] Furthermore, the compressed gas cooler 6 also generates condensed water, similar to the compressed gas cooler 5. Here, if condensed water discharge failure occurs, it does not directly affect the equipment within the two-stage gas compressor 100, but it does affect downstream equipment connected to the compressed gas path 46. Therefore, while a condensed water discharge port B similar to the condensed water discharge port A of the compressed gas cooler 5 is provided, the condensed water discharge port pressure sensor 18 and the condensed water discharge abnormality detection process described below using the condensed water discharge port pressure sensor 18 may not be used for the condensed water discharge port of the compressed gas cooler 6, if the sole purpose is to prevent malfunctions in the two-stage gas compressor 100.

[0067] Here, use Figures 3 to 10 , the pressure measured by the condensed water discharge path pressure sensor 17 will be described in conjunction with the pressure measured by the compressed gas path pressure sensor 19.

[0068] exist Figures 3 to 10 In the graph of FIG. 1 , the upper graph shows the pressure measured by the condensed water discharge path pressure sensor 17 with a solid line, and the compressed gas path pressure sensor 19 with a dotted line. The lower graph shows the timing at which the condensed water discharge valve 13 opens.

[0069] Figure 3 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water is normally discharged.

[0070] exist Figure 3 The condensed water discharge valve 13 is repeatedly opened and closed. The pressure of the condensed water discharge path pressure sensor 17 rises to a value below the pressure of the compressed gas path pressure sensor 19 when the condensed water discharge valve 13 is opened, and returns to atmospheric pressure when the condensed water discharge valve 13 is closed.

[0071] Here, when approaching the pressure of the compressed gas path pressure sensor 19, the slope of the waveform of the condensate discharge path pressure sensor 17 is blunted, so it can be confirmed that the time for the pressure of the condensate discharge path pressure sensor 17 to fully approach the pressure of the compressed gas path pressure sensor 19 is significantly shorter than the time when the condensate discharge valve 13 is opened (for example, 2 seconds).

[0072] Here, "sufficiently close" means that the ratio of the value of the condensed water discharge path pressure sensor 17 to the value of the compressed gas path pressure sensor 19 is within the range for normal condensed water discharge. The degree to which the value of the condensed water discharge path pressure sensor 17 is close to the value of the compressed gas path pressure sensor 19 varies depending on the diameter of the orifice 69, the structure of the condensed water discharge path outside the two-stage gas compressor 100, the amount of condensed water generated, and other factors.

[0073] Figure 4 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is clogged.

[0074] exist Figure 4 The rise of the value of the condensed water discharge path pressure sensor 17 is linked to the time when the condensed water discharge valve 13 is opened. Figure 3 The same as the normal state, but when the condensed water discharge valve 13 is open, the value of the condensed water discharge path pressure sensor 17 is not sufficiently close to the value of the compressed gas path pressure sensor 19.

[0075] At this time, it can be inferred that the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is clogged. This is because the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is narrower than normal due to clogging of the strainer 65, for example.

[0076] Figure 5 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water discharge path on the upstream side of the condensed water discharge path pressure sensor 17 is completely blocked.

[0077] exist Figure 5 It can be confirmed that when the condensed water discharge valve 13 is open, the value of the condensed water discharge path pressure sensor 17 does not rise from the atmospheric pressure or rises very little.

[0078] At this time, it can be inferred that the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is completely blocked. Complete blockage of the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 may occur, for example, when the condensed water discharge valve 13 cannot be opened or when the strainer 65 is completely blocked.

[0079] Figure 6 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water discharge valve 13 cannot be completely closed.

[0080] exist Figure 6 It can be confirmed that the waveform of the condensed water discharge path pressure sensor 17 always exceeds the atmospheric pressure regardless of whether the condensed water discharge valve 13 is opened or closed.

[0081] In this case, it can be presumed that the condensed water discharge valve 13 is not completely closed due to malfunction or the like.

[0082] Figure 7 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor 17 is clogged.

[0083] exist Figure 7 In the case of normal discharge of condensed water Figure 3 Compared to the waveform of the condensate discharge path pressure sensor 17, the condensate discharge valve 13 is open, and the slope is not very blunt when the value of the condensate discharge path pressure sensor 17 approaches the value of the compressed gas path pressure sensor 19. Therefore, the time during which the value of the condensate discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 is longer, approaching the time when the condensate discharge valve 13 opens.

[0084] At this time, it can be inferred that the condensed water discharge path downstream of the condensed water discharge path pressure sensor 17 is clogged. For example, the condensed water discharge path outside the two-stage gas compressor 100 begins to be clogged, and the condensed water discharge path becomes narrower than normal.

[0085] The higher the degree of clogging, the longer it takes for the pressure of the condensed water discharge path pressure sensor 17 to approach the pressure of the compressed gas path pressure sensor 19 .

[0086] Figure 8 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when clogging occurs in the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor 17, making sufficient discharge difficult.

[0087] exist Figure 8 In, with Figure 7 The waveform of the condensed water discharge path pressure sensor 17 is similar to that of the compressed gas path pressure sensor 19. When the condensed water discharge valve 13 is open, the value of the condensed water discharge path pressure sensor 17 is close to the value of the compressed gas path pressure sensor 19 for a long time, which is close to the time when the condensed water discharge valve 13 is opened. Figure 6Similarly, the waveform of the condensed water discharge path pressure sensor 17 indicates that the value of the condensed water discharge path pressure sensor 17 always exceeds the atmospheric pressure regardless of whether the condensed water discharge valve 13 is opened or closed.

[0088] At this time, it can be inferred that the condensed water discharge path downstream of the condensed water discharge path pressure sensor 17 is clogged, making it difficult for the condensed water to be fully discharged. Difficulty in fully discharging means that the condensed water discharge path outside the two-stage gas compressor 100 has become narrowed for some reason, and the speed of discharging the condensed water is slower than the speed at which the condensed water is generated.

[0089] Figure 9 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when high-pressure fluid enters the condensed water discharge path.

[0090] exist Figure 9 In the embodiment, when the condensate discharge valve 13 is open, the pressure measured by the condensate discharge path pressure sensor 17 is significantly higher than the pressure measured by the compressed gas path pressure sensor 19 .

[0091] This is an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the high-pressure fluid flows back to the condensed water discharge path 72 from the path outside the two-stage gas compressor 100 having a higher pressure than the pressure of the condensed water discharge path pressure sensor 17 .

[0092] Figure 10 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when the condensed water discharge path on the downstream side of the condensed water discharge path pressure sensor 17 is completely blocked.

[0093] exist Figure 10 In the embodiment, regardless of whether the condensed water discharge valve is opened or closed, the value of the condensed water discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19.

[0094] At this time, it can be inferred that the condensed water discharge path is completely blocked downstream of the condensed water discharge path pressure sensor 17. Complete blockage means that the condensed water discharge path outside the two-stage gas compressor 100 is completely blocked for some reason, and condensed water cannot be discharged at all.

[0095] The following describes a method for detecting condensate discharge failures based on the above-mentioned tendency. Figure 2 The detection of the condensed water discharge portion A is shown below as an example.

[0096] Figure 11 1 is a flowchart showing an example of abnormality detection processing executed by the control unit 10 of the two-stage gas compressor 100 .

[0097] After a predetermined number of seconds have passed since the second-stage gas compressor 100 started to generate condensed water, Figure 11 The data collection, calculation, and discharge failure determination processes of steps S102 to S107 are repeated at predetermined intervals. The predetermined intervals are set in advance to be shorter than the time the condensed water discharge valve 13 is open.

[0098] First, the control unit 10 obtains the pressure values measured by the condensate discharge path pressure sensor 17 and the compressed gas path pressure sensor 19 (step S102), and stores the value of the condensate discharge path pressure sensor 17 in the variable N1, and stores the value of the compressed gas path pressure sensor 19 in M1 (step S103).

[0099] Then, the upstream side recording processing (step S104) is performed to collect data on the blockage on the upstream side of the condensate discharge path pressure sensor 17, and then the upstream side judgment processing (step S105) is performed to judge whether blockage occurs on the upstream side of the condensate discharge path pressure sensor 17 and the degree of blockage based on the data collected in step S104.

[0100] Next, the downstream side recording processing (step S106) is performed to collect data on the blockage on the downstream side of the condensate discharge path pressure sensor 17, and then the downstream side judgment processing (step S107) is performed to judge whether blockage has occurred on the downstream side of the condensate discharge path pressure sensor 17 and the degree of blockage based on the data collected in step S106, and return to step S102.

[0101] Alternatively, the upstream processing of steps S104 and S105 may be performed after the downstream processing of steps S106 and S107 is performed.

[0102] In the following Figures 12 to 15 In the flowchart, variables U1, U2, U3, D1, D2, D3, and D4 are used, and their initial values are all set to 0. These variables act as counters, which add 1 to the variables when a certain condition is met and return the value to 0 under a certain condition. Figure 11 When processing, there are cases where variables U1, U2, U3, D1, D2, and D3 are added each time, which means that a certain state is continuous.

[0103] In addition, Figures 12 to 15 In the flowchart, when the condensate discharge path is blocked but the secondary gas compressor 100 can still operate, a yellow alarm is output, and when the operation of the secondary gas compressor 100 stops due to an abnormality in the condensate discharge path, a red alarm is output.

[0104] Figure 12 Yes Figure 11 A flowchart of an example of upstream recording processing in step S104 is shown. Figure 13 Yes Figure 11 Flowchart of an example of upstream side determination processing of step S105.

[0105] pass Figure 12 and Figure 13 The processing is used to determine whether there is a malfunction on the upstream side of the condensed water discharge path pressure sensor 17 (the condensed water discharge path 71 side).

[0106] exist Figure 12 In step S121, the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined first constant less 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. Here, the first constant is set to determine whether the value of the condensed water discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19. "Sufficiently close" is used as Figure 3 As described above, this indicates that the ratio of the value of the condensed water discharge path pressure sensor 17 to the value of the compressed gas path pressure sensor 19 is within the range for normal condensed water discharge.

[0107] When the value of N1 is smaller than the value obtained by multiplying the value of M1 by the first constant, the state continues to exist, such as Figure 4 As shown, when the condensed water discharge valve 13 is open, the value of the condensed water discharge path pressure sensor 17 is not sufficiently close to the value of the compressed gas path pressure sensor 19 , and it can be inferred that the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is clogged.

[0108] If the value of N1 is less than the value obtained by multiplying the value of M1 by the first constant in step S121, the variable U1 is incremented by 1 (step S122), and the process proceeds to step S124. On the other hand, if the value of N1 is greater than the value obtained by multiplying the value of M1 by the first constant in step S121, the variable U1 is reset to 0 (step S123), and the process proceeds to step S124. Thus, while the variable U1 is incremented when the condensed water discharge valve 13 is closed, if the value of the condensed water discharge path pressure sensor 17 rises sufficiently when the condensed water discharge valve 13 is opened, no abnormality is detected.

[0109] Next, the control unit 10 compares the value of N1 with the maximum value of the measurement error of the condensed water discharge path pressure sensor 17 and determines whether the value of N1 is smaller than the maximum value of the measurement error of the condensed water discharge path pressure sensor 17 (step S124).

[0110] When the value of N1 is smaller than the maximum value of the measurement error of the condensed water discharge path pressure sensor 17, the Figure 5As shown, the waveform of the condensed water discharge path pressure sensor 17 does not rise from the atmospheric pressure or rises very little, and it can be inferred that the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is completely clogged.

[0111] If the value of N1 is less than the maximum value of the measurement error of the condensed water discharge path pressure sensor 17 in step S124, the variable U2 is incremented by 1 (step S125), and the process proceeds to step S127. On the other hand, if the value of N1 is greater than or equal to the maximum value of the measurement error of the condensed water discharge path pressure sensor 17 in step S124, the variable U2 is reset to 0 (step S126), and the process proceeds to step S127.

[0112] Next, the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined second constant less than 1, and determines whether the value of N1 is greater than the value obtained by multiplying the value of M1 by the predetermined second constant less than 1 (step S127). Here, the second constant is set to a value less than 1 and greater than 0 so that the value obtained by multiplying the value of M1 by the second constant is greater than the atmospheric pressure.

[0113] When the state in which the value of N1 is larger than the value obtained by multiplying the value of M1 by a predetermined second constant smaller than 1 exists continuously, as shown in FIG. Figure 6 As shown, the waveform of the condensed water discharge path pressure sensor 17 always exceeds the atmospheric pressure regardless of whether the condensed water discharge valve 13 is opened or closed, and it can be inferred that the condensed water discharge valve 13 is not completely closed.

[0114] If the value of N1 is greater than the value obtained by multiplying the value of M1 by the second constant in step S127, the variable U3 is incremented by 1 (step S128), and the process ends. On the other hand, if the value of N1 is less than the value obtained by multiplying the value of M1 by the second constant in step S127, the variable U3 is set to 0 (step S129), and the process ends.

[0115] Next, in Figure 13 In step S132, the control unit 10 determines whether the value of the variable U1 exceeds a predetermined number of times. Figure 13 In the process of the predetermined number of times, the process is repeated at least more than the period from the opening of the condensed water discharge valve 13 to the next opening. Figure 11 The larger the number of times the process is performed, the higher the value.

[0116] When the value of variable U1 exceeds the specified number of times in step S132, Figure 4As shown, when the condensed water discharge valve 13 is open, the value of the condensed water discharge path pressure sensor 17 is not sufficiently close to the value of the compressed gas path pressure sensor 19. Therefore, it is determined that there is a blockage in the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17, and a yellow alarm is output (step S133), and the process proceeds to step S134. On the other hand, if the value of the variable U1 does not exceed the specified number of times in step S132, the process proceeds to step S134.

[0117] Next, the control unit 10 determines whether the value of the variable U2 exceeds a predetermined number of times (step S134 ).

[0118] When the value of variable U2 exceeds the specified number of times in step S134, Figure 5 As shown in FIG1 , if the waveform of the condensed water discharge path pressure sensor 17 does not rise from atmospheric pressure or rises only slightly, it is determined that the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is completely blocked, a red alarm is output (step S135), and the process proceeds to step S136. On the other hand, if the value of the variable U2 does not exceed the specified number of times in step S134, the process proceeds to step S136.

[0119] Next, the control unit 10 determines whether the value of the variable U3 exceeds a predetermined number of times (step S136 ).

[0120] When the value of variable U3 exceeds the specified number of times in step S136, Figure 6 As shown, regardless of whether the condensed water discharge valve 13 is opened or closed, the waveform of the condensed water discharge path pressure sensor 17 always exceeds the atmospheric pressure, and the condensed water discharge valve 13 is judged to be incompletely closed. A yellow alarm is output (step S137), and the process ends. On the other hand, if the value of the variable U3 does not exceed the specified number of times in step S136, the process ends.

[0121] In addition, in order to Figure 15 The discharge abnormality on the downstream side determined in step S157 is distinguished, and the prescribed number of times in step S137 is preferably sufficiently longer than the prescribed number of times in step S157.

[0122] Here, when the condensed water discharge path upstream of the condensed water discharge path pressure sensor 17 is completely blocked, it is impossible to determine whether the condensed water discharge path downstream is normal. Therefore, when a red alarm indicating complete blockage on the upstream side is output, blockage is also detected on the downstream side.

[0123] Figure 14 Yes Figure 11 This is a flowchart of an example of the downstream recording process of step S106. Figure 15 Yes Figure 11 Flowchart of an example of the downstream side determination processing of step S107.

[0124] pass Figure 14 and Figure 15 The processing is used to determine whether there is a malfunction on the downstream side of the condensed water discharge path pressure sensor 17 (the condensed water discharge path 72 side).

[0125] exist Figure 14 In step S140, the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined third constant less 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. Here, the third constant is set to a value greater than 1 so that it can be determined that the value of N1 is significantly greater than the value of M2.

[0126] When the value of N1 is greater than the value obtained by multiplying the value of M1 by the third constant, such as Figure 9 As shown, when the condensate discharge valve 13 is opened, the pressure measured by the condensate discharge path pressure sensor 17 is clearly higher than the pressure measured by the compressed gas path pressure sensor 19. It can be inferred that the high-pressure fluid flows back to the condensate discharge path 72 from the path outside the secondary gas compressor 100 having a pressure higher than the pressure of the condensate discharge path pressure sensor 17.

[0127] If the value of N1 is greater than the value obtained by multiplying the value of M1 by the third constant in step S140, 1 is added to the variable D1 (step S141), and the process proceeds to step S143. On the other hand, if the value of N1 is less than the value obtained by multiplying the value of M1 by the third constant in step S140, the variable D1 is set to 0 (step S142), and the process proceeds to step S143.

[0128] Next, 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 larger than the value obtained by multiplying the value of M1 by the predetermined first constant smaller than 1 (step S143).

[0129] When the value of N1 is larger than the value obtained by multiplying the value of M1 by a predetermined first constant smaller than 1, the state continues to exist. Figure 10 As shown, regardless of whether the condensate discharge valve is opened or closed, the value of the condensate discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19. It can be inferred that the condensate discharge path on the downstream side of the condensate discharge path pressure sensor 17 is completely blocked.

[0130] If, in step S143, the value of N1 is greater than the value obtained by multiplying the value of M1 by a predetermined first constant 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 less than or equal to the value obtained by multiplying the value of M1 by a predetermined first constant less than 1, variable D2 is set to 0 (step S145), and the process proceeds to step S148.

[0131] Next, the control unit 10 determines whether the variable D2 is equal to a predetermined number of times (step S146). The predetermined number of times is set to be repeated more than the period during which the condensed water discharge valve 13 is open. Figure 11 The number of times of processing is small, and the variable D2 will not reach the value of the specified number of times when the condensed water is discharged normally.

[0132] If the variable D2 is equal to the predetermined number in step S146, 1 is added to the variable D4 (step S147), and the process proceeds to step S148. On the other hand, if the variable D2 is not equal to the predetermined number in step S146, the process proceeds to step S148.

[0133] When the state where variable D2 is equal to the specified number of times exists continuously, such as Figure 7 As shown, the time when the value of the condensate discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 is long, which is close to the time when the condensate discharge valve 13 opens. It can be inferred that the condensate discharge path on the downstream side of the condensate discharge path pressure sensor 17 is blocked.

[0134] This process is for detecting a state in which the pressure at the condensed water discharge path pressure sensor 17 increases sharply due to the narrowing of the condensed water discharge path downstream of the condensed water discharge path pressure sensor 17 , but the pressure decreases when the condensed water discharge valve 13 is closed.

[0135] Blockage of the condensate discharge path upstream of the condensate discharge path pressure sensor 17 can be detected by observing a lower-than-normal reading from the condensate discharge path pressure sensor 17 for a predetermined period of time. On the other hand, if the condensate discharge path downstream of the condensate discharge path pressure sensor 17 is blocked, the waveform of the condensate discharge path pressure sensor 17 rises sharply when the condensate discharge valve 13 opens and returns to near atmospheric pressure when the condensate discharge valve 13 closes. Therefore, it is necessary to observe the rapid rise in the value of the condensate discharge path pressure sensor 17 multiple times. Therefore, using variable D4 as described above and incrementing it by 1 only when variable D2 reaches a predetermined number of times is appropriate.

[0136] In the case where a yellow alarm is output when the value of the condensed water discharge path pressure sensor 17 rises sharply once, the variable D4 may not be used, and a yellow alarm may be output when D2 exceeds a predetermined number of times.

[0137] Next, the control unit 10 compares the value of N1 with the value obtained by multiplying the value of M1 by a predetermined second constant less than 1, 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). Here, the second constant is set to a value less than 1 and greater than 0 so that the value obtained by multiplying the value of M1 by the second constant is greater than the atmospheric pressure.

[0138] When the variable D2 is in a state equal to the predetermined number of times, and the value of N1 is larger than the value obtained by multiplying the value of M1 by a predetermined second constant less than 1, the state continues to exist. Figure 8 As shown, the time when the value of the condensate discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 is long, close to the time when the condensate discharge valve 13 is opened, and regardless of whether the condensate discharge valve 13 is opened or closed, the value of the condensate discharge path pressure sensor 17 always exceeds the atmospheric pressure. It can be inferred that the condensate discharge path on the downstream side of the condensate discharge path pressure sensor 17 is blocked, making it difficult for the condensate to be fully discharged.

[0139] If the value of N1 is greater than the value obtained by multiplying the value of M1 by the second constant in step S148, the variable D3 is incremented by 1 (step S149), and the process ends. On the other hand, if the value of N1 is less than the value obtained by multiplying the value of M1 by the second constant in step S148, the variable D3 is reset to 0 (step S150), and the process ends.

[0140] Next, in Figure 15 , the control unit 10 determines whether the value of the variable D1 exceeds 1 (step S153).

[0141] When the value of variable D1 exceeds 1 in step S153, Figure 9 As shown, when the condensate discharge valve 13 is open, the pressure measured by the condensate discharge path pressure sensor 17 is clearly higher than the pressure measured by the compressed gas path pressure sensor 19. This indicates that high-pressure fluid is flowing backward from the path outside the two-stage gas compressor 100, which has a higher pressure than the pressure of the condensate discharge path pressure sensor 17, into the condensate discharge path 72. A red alarm is output (step S154), and the process proceeds to step S155. On the other hand, if the value of the variable D1 does not exceed 1 in step S153, the process proceeds to step S155.

[0142] Next, the control unit 10 determines whether the value of the variable D4 exceeds a predetermined number of times (step S155). The predetermined number of times is set to a value of 2 or more.

[0143] When the value of variable D4 exceeds the specified number of times in step S155, Figure 7As shown, if the value of the condensed water discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 for a long time, approaching the time when the condensed water discharge valve 13 opens, it is determined that the condensed water discharge path downstream of the condensed water discharge path pressure sensor 17 is clogged, a yellow alarm is output (step S156), and the process proceeds to step S157. On the other hand, if the value of the variable D4 does not exceed the specified number of times in step S155, the process proceeds to step S159.

[0144] In step S157, the control unit 10 determines whether the value of the variable D3 exceeds a predetermined number of times. The predetermined number of times is at least the period from the time the condensed water discharge valve 13 is opened to the time it is opened next time. Figure 11 The larger the number of times the process is performed, the higher the value.

[0145] When the value of variable D3 exceeds the specified number of times in step S157, Figure 8 As shown, the value of the condensed water discharge path pressure sensor 17 is sufficiently close to the value of the compressed gas path pressure sensor 19 for a long time, approaching the opening time of the condensed water discharge valve 13. Moreover, the value of the condensed water discharge path pressure sensor 17 always exceeds the atmospheric pressure regardless of whether the condensed water discharge valve 13 is opened or closed. This indicates that the condensed water discharge path downstream of the condensed water discharge path pressure sensor 17 is clogged, making it difficult to fully discharge the condensed water. A red alarm is output (step S158), and the process proceeds to step S159. On the other hand, if the value of the variable D3 does not exceed the specified number of times in step S157, the process proceeds to step S159.

[0146] In step S159 , the control unit 10 determines whether the value of the variable D2 exceeds a predetermined number of times.

[0147] When the value of variable D2 exceeds the specified number of times in step S159, Figure 10 As shown, regardless of whether the condensate discharge valve is open or closed, the value of the condensate discharge path pressure sensor 17 is always as high as the value of the compressed gas path pressure sensor 19. This indicates that the condensate discharge path downstream of the condensate discharge path pressure sensor 17 is completely blocked, and a red alarm is output (step S160), terminating the process. On the other hand, if the value of the variable D2 does not exceed the specified number of times in step S159, the process ends.

[0148] The above-described determination result of the blockage of the condensed water discharge path can be confirmed by outputting a signal from the control unit 10 and displaying it on the monitor 98 provided on the front surface of the two-stage gas compressor 100 .

[0149] Figure 16 1 is a diagram showing an example of a yellow alarm screen displayed on the monitor 98. Figure 17 This is a diagram showing an example of a red alarm screen displayed on the monitor 98 .

[0150] Output when the secondary gas compressor 100 is still able to operate despite the condensate discharge path being blocked Figure 16 The yellow alert shows the location where the blockage has occurred.

[0151] When the operation of the secondary gas compressor 100 stops due to an abnormality in the condensed water discharge path, the output Figure 17 In the red alarm, the location where the blockage has occurred and the fact that the condensed water cannot be discharged are clearly displayed on the monitor, and the control unit 10 stops the operation of the secondary gas compressor 100.

[0152] According to Example 1, the condensate discharge valve 13 is opened and closed at predetermined intervals, and the control unit 10 determines the location and extent of the condensate discharge abnormality based on the waveform of the condensate discharge path pressure sensor 17 that measures the pressure in the condensate discharge path 72, thereby being able to detect the location and extent of the condensate discharge abnormality.

[0153] Example 2

[0154] The structure of the two-stage gas compressor of embodiment 2 is the same as that of embodiment 1. In embodiment 2, by displaying the Figures 3 to 10 By observing the waveform of the condensed water discharge path pressure sensor 17 shown above, the operator can confirm the position and degree of blockage in the condensed water discharge path in detail.

[0155] For example, in Example 1, if a yellow alarm is output due to a blockage on the upstream side of the condensed water discharge path pressure sensor 17, the following may occur: Figure 11 The following two modes cannot be used to determine the detailed state of the condensed water discharge path in the abnormality detection process. In the second embodiment, this can be confirmed by the waveform of the condensed water discharge path pressure sensor 17 displayed on the monitor 98.

[0156] The first mode is when both upstream and downstream of the condensate discharge path pressure sensor 17 are blocked and the fluid can flow through the pipe. Figure 11 In the abnormality detection process, it is determined that there is a blockage in the condensed water discharge path on the upstream side of the condensed water discharge path pressure sensor 17, and a yellow alarm is output. At this time, the monitor 98 displays Figure 18 That waveform.

[0157] Figure 18 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when both the condensed water discharge paths upstream and downstream of the condensed water discharge path pressure sensor 17 are clogged.

[0158] exist Figure 18The value of the condensed water discharge path pressure sensor 17 does not rise until it is determined that the condensed water is discharged normally. In addition, the time for the pressure of the condensed water discharge path pressure sensor 17 and the pressure of the compressed gas path pressure sensor 19 to be sufficiently close is long.

[0159] The second mode is when the condensed water discharge path is not blocked, but a large amount of condensed water passes through the condensed water discharge path pressure sensor 17. Figure 12 The value of the first constant in step S121 is used to determine that there is a blockage in the condensed water discharge path on the upstream side of the condensed water discharge path pressure sensor 17, and a yellow alarm is output. At this time, the monitor 98 displays Figure 19 That waveform.

[0160] Figure 19 This is a diagram showing an example of the pressure measured by the condensed water discharge path pressure sensor 17 when a large amount of condensed water passes through the condensed water discharge path pressure sensor 17 .

[0161] exist Figure 19 In the process, the value of the condensed water discharge path pressure sensor 17 rises more gently than when the condensed water is normally discharged.

[0162] The second mode is caused by, for example, the generation of a large amount of condensed water when the surrounding area of the two-stage gas compressor 100 is hot and humid. Although the condensed water discharge path is not clogged, the condensed water discharge valve 13 may be open for a short time. This can be addressed by setting this time to be longer.

[0163] According to the second embodiment, by displaying the waveform of the condensed water discharge path pressure sensor 17 on the monitor 98 , the operator can confirm in detail the position and degree of blockage in the condensed water discharge path.

[0164] Example 3

[0165] Example 3 Execution Figure 11 The abnormality detection processing is the same as that in Example 1.

[0166] Figure 20 This is a diagram showing an example of the structure of a two-stage gas compressor 100 according to the third embodiment.

[0167] Figure 20 The two-stage gas compressor 100 has a temperature sensor 77 and a humidity sensor 78 at the inlet 1 for introducing the external air. Figure 1 Different. Figure 1 The same configuration is denoted by the same reference numerals, and description thereof is omitted.

[0168] The temperature sensor 77 and the humidity sensor 78 respectively measure the temperature and humidity of the outside air introduced from the outside through the air inlet 1 .

[0169] The first constant used in the abnormality detection process is made variable based on the values measured by temperature sensor 77 and humidity sensor 78. The amount of condensed water generated can be estimated based on the temperature and humidity of the outside air introduced from the outside. The constant used to determine the state of the condensed water discharge path can be changed based on the behavior when a large amount of condensed water is generated and when almost no condensed water is generated.

[0170] For example, when the outside air is estimated to be high temperature and high humidity, a large amount of condensed water is flowing. In this case, the value of the condensed water discharge path pressure sensor 17 may not rise compared to normal. Therefore, by lowering the first constant used to determine whether there is blockage upstream of the condensed water discharge path pressure sensor 17, an erroneous determination of upstream blockage is avoided.

[0171] According to the third embodiment, by changing the constant used in the abnormality detection process based on the temperature and humidity of the outside air, it is possible to determine abnormality in condensed water discharge in conjunction with the amount of condensed water generated, thereby reducing the incidence of false positives.

[0172] Example 4

[0173] The fourth embodiment determines the location and extent of the condensed water discharge path according to the waveform of the condensed water discharge path pressure sensor 17. This is the same as the first embodiment, but does not perform Figure 11 The abnormality detection processing is performed, and the location and degree of the blockage are judged based on the waveform of the condensate discharge path pressure sensor 17 displayed on the monitor 98 by using machine learning waveform judgment, and an alarm is displayed on the monitor 98 according to the setting.

[0174] This waveform determination does not need to be performed continuously at all times, and may be performed based on the waveform shape at predetermined time intervals or at any timing.

[0175] According to the fourth embodiment, even without confirmation by the operator, the position and extent of the condensed water discharge abnormality can be detected based on the complex pattern of the waveform of the condensed water discharge path pressure sensor 17 .

[0176] Example 5

[0177] Example 5 Execution Figure 11 The abnormality detection processing is the same as that in Example 1.

[0178] Figure 21 This is a diagram showing an example of the structure of a two-stage gas compressor 100 according to the fifth embodiment.

[0179] Figure 21 The two-stage gas compressor 100 has an antenna 99 that can communicate with the outside from the control unit 10. Figure 1 Different. Figure 1The same configuration is denoted by the same reference numerals, and description thereof is omitted.

[0180] Using antenna 99, Figure 11 The abnormality detection process is performed to detect the abnormality of the condensed water discharge path and transmit the result to the external device. In this way, the person in charge of the maintenance of the two-stage gas compressor 100 can be notified of the abnormality of the condensed water discharge path, so that it can be dealt with in time.

[0181] According to Example 5, the two-stage gas compressor 100 has a function for notifying the outside world of the location and extent of a condensate discharge anomaly. This allows operators to be notified of the location and extent of the condensate discharge anomaly as early as possible. This allows operators to promptly prepare necessary countermeasures and components to be replaced based on the location and extent of the condensate discharge anomaly.

[0182] Furthermore, the present invention is not limited to the above-described embodiments and encompasses various variations. For example, the above-described embodiments are provided for the purpose of explaining the present invention in an easily understandable manner and are not necessarily intended to include all of the structures described. Furthermore, a portion of the structure of one embodiment may be replaced with a structure of another embodiment, and a structure of another embodiment may be added to a structure of one embodiment. Furthermore, other structures may be added, deleted, or substituted for a portion of the structure of each embodiment.

[0183] Description of Reference Numerals

[0184] 3 Low-pressure stage compressor body

[0185] 5 Compressed gas cooler

[0186] 7 Condensate separator

[0187] 10. Control Unit

[0188] 13 Condensate drain valve

[0189] 17 Condensate discharge path pressure sensor

[0190] 19 Compressed gas path pressure sensor

[0191] 71 Condensate drainage path

[0192] 72 Condensate drainage path

[0193] 100 Two-stage gas compressor.

Claims

1. A gas compressor comprising: a compressor body for compressing gas; a compressed gas cooler for cooling the compressed gas compressed by the compressor body; and a condensed water separator for separating condensed water from the compressed gas cooled by the compressed gas cooler, The gas compressor is characterized by comprising: a condensed water discharge path for conveying the condensed water separated by the condensed water separator to the outside of the gas compressor; a condensed water discharge valve provided in the condensed water discharge path and opening and closing at predetermined intervals to discharge the separated condensed water; a condensate discharge path pressure sensor, disposed downstream of the condensate discharge valve, for measuring the pressure in the condensate discharge path; and A control unit determines a position and a degree of abnormality in discharge of the condensed water based on the pressure measured by the condensed water discharge path pressure sensor.

2. The gas compressor according to claim 1, wherein Also includes: a compressed gas path through which the compressed gas compressed by the compressor body passes; and a compressed gas path pressure sensor for measuring the pressure within said compressed gas path, The control unit records the time during which the ratio of the pressure measured by the condensed water discharge path pressure sensor to the pressure measured by the compressed gas path pressure sensor is within a predetermined range. The position and degree of the abnormality in the discharge of the condensed water are determined based on the recorded time.

3. The gas compressor according to claim 2, wherein: Also includes a display unit, The control unit displays the position and degree of the abnormality in discharge of the condensed water on the display unit.

4. The gas compressor according to claim 2, wherein: Also includes: a temperature sensor for measuring the temperature of the outside air; and Humidity sensor for measuring the humidity of the outside air, The control unit changes the predetermined range based on the measured temperature and humidity of the outside air.

5. The gas compressor according to claim 2, wherein: Also includes a display unit, The waveforms of the pressures measured by the condensed water discharge path pressure sensor and the compressed gas path pressure sensor are displayed on the display unit.

6. The gas compressor according to claim 2, wherein: The control unit determines the position and extent of the condensed water discharge abnormality based on waveforms of pressures measured by the condensed water discharge path pressure sensor and the compressed gas path pressure sensor through waveform determination using machine learning.

7. The gas compressor according to claim 2, wherein: Also included is an antenna capable of communicating with external devices, The control unit transmits the position and degree of the abnormality in discharge of the condensed water to the external device through the antenna.

8. The gas compressor according to claim 2, wherein: The compressor body has: a low-pressure stage compressor body that compresses gas taken in from outside the gas compressor; and a high-pressure stage compressor body that further compresses the gas compressed by the low-pressure stage compressor body, The compressed gas cooler comprises: a first cooler that cools the gas compressed by the low-pressure stage compressor body; and a second cooler for cooling the gas compressed by the high-pressure stage compressor body; The condensed water separator separates condensed water from the compressed gas separated by the first cooler.

9. The gas compressor according to claim 2, wherein: The compressor body includes a screw rotor.

10. The gas compressor according to claim 2, wherein: No lubricating oil is contained in the compressed gas path.

11. The gas compressor according to claim 2, wherein: The compressed gas cooler cools the compressed gas by exchanging heat between cooling water and the compressed gas.

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