JP2021110263A - Fluid machine and maintenance method thereof - Google Patents

Abstract

To provide a fluid machine which can further safely, surely and efficiently perform maintenance while reducing an influence such as a feeling, skill and an experience of an operator as much as possible, and its maintenance method.SOLUTION: A fluid machine comprises a compressor main body, a drive unit for driving the compressor main body, and a display and input device, and has a control device and a detection device for detecting a state of the fluid machine. When a prescribed maintenance mode is selected via the display and input device, the control device displays an input part for a first work indication and confirming a finish of first work at the display and input device, and when the finish of the first work is inputted via the input part, the fluid machine performs a first prescribed operation. The fluid machine sets a first operation of serial order operations for determining whether or not the first prescribed operation is finished by a physical amount detected by the detection device and an input operation performed to the display and input device as a first step, and sequentially performs the operations from the first step up to a preset n-th step.SELECTED DRAWING: Figure 4A

Description

The present invention relates to maintenance of a fluid machine.

As a fluid machine, for example, a compressor that compresses a gas such as air has a built-in detection means for detecting whether or not the temperature and pressure of the fluid in each part are preset normal values. When the value detected by the compressor deviates from the normal value, the control device of the compressor determines that a failure has occurred, and the technology for displaying the operation method for recovering from the failure on the display device mounted on the compressor is known. Has been done. As a prior art of this kind, for example, there is Patent Document 1.

In Patent Document 1, an air filter detecting means for detecting clogging of an air filter, a discharge temperature detecting means, a discharge pressure detecting means, an oil filter detecting means for detecting clogging of an oil filter, and a motor current are detected. A storage device that stores the data detected by each detection means and the cause of the failure when a failure occurs in the screw compressor, a control device that controls the operation of the compressor, an input means, and a display. Provide means. The storage device stores the operation procedure flow of the compressor, and at the time of troubleshooting, the operation signal is interactively output from the input means based on the output of the display means in which the failure data stored in the storage means and the operation procedure flow are displayed. input.

Japanese Unexamined Patent Publication No. 2-157486

Patent Document 1 mainly describes a defect cause search and recovery method when a defect occurs in the compressor, and an operation procedure and a failure countermeasure procedure are displayed on the display device of the compressor, and the operator is displayed. The compressor can be operated according to the procedure. However, for example, the subject of the operation for completing a certain failure countermeasure is the operator, and the compressor operates according to the operation input by the operator. Therefore, even if the operator makes an erroneous input. The compressor operates as it is, and as a result, failure countermeasures may not be completed or it may take longer to complete.

Further, in Patent Document 1, there is the same problem as the above-mentioned method of searching for the cause when a problem occurs in that the operation procedure is displayed on the display device even when performing maintenance. In addition, although it is assumed that many operation procedures are required for maintenance, the operation method varies depending on the method of reducing the burden and work time of the operator and the sense, familiarity, and experience of the operator. There is no specific mention of how to deal with the possibility that the intended maintenance may be incomplete or inefficient.

An object of the present invention is to enable safer, more reliable, and more efficient maintenance of a fluid machine while reducing the influence of the operator's feeling, familiarity, and experience as much as possible.

To give an example of the present invention, a fluid machine including a compressor main body, a drive device for driving the compressor main body, and a display / input device for detecting the state of the control device and the fluid machine. Having a device, the control device provides the display / input device with an instruction for the first work and an input unit for confirming the completion of the first work when a predetermined maintenance mode is selected via the display / input device. When the display is displayed and the completion of the first work is input via the input unit, the fluid machine performs the first predetermined operation, and the first predetermined operation is performed by the physical quantity detected by the detection device and the input operation to the display / input device. The first step is the first of a series of sequential operations for determining whether or not is completed, and the first step is configured to be performed in order from the first to the preset nth step.

According to the present invention, it is possible to provide a fluid machine capable of performing maintenance more safely, reliably and efficiently while reducing the influence of the operator's sense, familiarity, and experience as much as possible, and a maintenance method thereof.

It is a system diagram which shows the component of the compressor in Example 1. FIG. This is a maintenance menu screen displayed on the compressor in the first embodiment. It is an oil exchange mode screen displayed on the compressor in Example 1. This is the first half of the flowchart of the oil change mode included in the compressor according to the first embodiment. This is the latter half of the flowchart of the oil change mode included in the compressor according to the first embodiment. It is a test run mode screen displayed on the compressor in Example 2. This is the first part of the flowchart of the test run mode included in the compressor according to the second embodiment. This is an intermediate portion of the flow chart of the test run mode included in the compressor according to the second embodiment. This is the latter part of the flowchart of the test run mode included in the compressor in the second embodiment.

Hereinafter, examples of the present invention will be described with reference to the drawings.

In this embodiment, an air-cooled oil-free two-stage screw compressor will be used as the fluid machine. FIG. 1 is a system diagram showing the components of the compressor in this embodiment.

The oil-free two-stage screw compressor shown in FIG. 1 is configured to suck in gas (air in this embodiment), compress it, and discharge it. The compressor 100 of FIG. 1 has a configuration in which air is compressed in two stages, and air is sucked and compressed by driving a low-pressure stage compressor main body 101 and a high-pressure stage compressor main body 102. , Discharge.

The low-pressure stage compressor main body 101, the high-pressure stage compressor main body 102, the motor 103, and the oil pump 105 are fixed to the speed increasing device case 104. A low-pressure pinion 107 is attached to the tip of the drive shaft of the low-pressure compressor main body 101, a high-pressure pinion 108 is attached to the tip of the drive shaft of the high-pressure compressor main body 102, and a drive shaft is attached to the drive shaft of the motor 103. The bull gear 106 and the oil pump pinion 109 are fitted from the root side of the wheel. The bull gear 106 meshes with the low pressure stage pinion 107 and the high pressure stage pinion 108, and the oil pump pinion 109 meshes with the oil pump gear 110. The motor 103 is driven and the bull gear 106 rotates to rotate the low pressure stage. The compressor main body 101, the high-pressure stage compressor main body 102, and the oil pump 105 are driven.

When the low-pressure stage compressor main body 101 and the high-pressure stage compressor main body 102 are driven by the motor 103, air is sucked from the ambient air through the air filter 601 and the sucked air is low-pressure through the suction air path 401. It flows into the stage compressor main body 101. The low-pressure stage compressor main body 101 compresses air to a predetermined pressure, and the compressed air flows into the intercooler 201 through the low-pressure stage discharge air path 402. The intercooler 201 is an air-cooled heat exchanger, and high-temperature compressed air is cooled by the cooling air generated by the cooling fan 204. The compressed air cooled by the intercooler 201 passes through the high-pressure stage suction air path 403 and flows into the high-pressure stage compressor main body 102, where the air is compressed to a higher pressure. The high-pressure compressed air discharged from the high-pressure stage compressor main body 102 passes through the high-pressure stage discharge air path 404 and flows into the aftercooler 202. The aftercooler 202 is also an air-cooled heat exchanger similar to the intercooler 201, and the compressed air is cooled by the cooling air of the cooling fan 204. The compressed air cooled by the aftercooler 202 passes through the discharge air path 405 and is supplied to the demand destination of the compressed air.

The low-pressure stage compressor main body 101, the high-pressure stage compressor main body 102, the speed-increasing device case 104, and the oil pump 105 have built-in bearings that support an internal rotating body (not shown), and also include a bull gear 106 and a low-pressure stage pinion. Since the 107, the high-pressure stage pinion 108, the oil pump pinion 109, and the oil pump gear 110 rotate while meshing with each other, a lubricant is generally required for these mechanical parts, and in this embodiment, the lubricating oil accelerates. It is stored in the lower part of the device case 104. Lubricating oil can be replenished through the filler port 111. Hereinafter, the lubricating oil may be omitted and simply referred to as oil.

When the oil pump 105 is driven by the motor 103, the lubricating oil is sucked from the strainer 602 installed at the lower part of the speed increasing device case 104, passes through the suction oil pipe 412, flows into the oil pump 105, and is discharged. NS. The lubricating oil discharged from the oil pump 105 passes through the discharge oil path 413, is cooled by the oil cooler 203, which is an air-cooled heat exchanger, and then is sent to the main oil supply path 414. An oil filter 603 is installed in the middle of the main oil supply path 414. Further, the main refueling path 414 is branched into a low pressure stage refueling path 415, a high pressure stage refueling path 416, and a speed increasing device refueling path 417, and the low pressure stage compressor main body 101, the high pressure stage compressor main body 102, and the speed increasing device case. Lubricating oil is supplied to 104. When the lubricating oil is discharged, the oil discharge valve 309 is passed through the first oil discharge path 411 arranged at the bottom of the speed increasing device case and the second oil discharge path 418 branching from the main oil supply path 414. Can be discharged by opening.

On the compressed air path, there is an air release device for discharging the compressed air remaining in the compressed air path to the outside when the compressor operates without load or when the operation is stopped. The exhaust valve 302 discharges compressed air on the air path including the intercooler 201 from the discharge side of the low-pressure stage compressor main body 101 to the suction side of the high-pressure stage compressor main body 102, and releases the compressed air along the air passage including the intercooler 201. The valve 304 discharges compressed air on the air path from the discharge side of the high-pressure stage compressor main body 102 to the check valve 305 to the outside.

An automatic discharge valve 306 that opens and closes in conjunction with the operation and stop of the compressor is installed on the discharge air path 405, and a sluice valve 308 that serves as a boundary between the compressor and the compressed air demand destination is installed downstream of the automatic discharge valve 306. The sluice valve 308 is always open except during compressor maintenance. The maintenance air discharge path 406 branches from the middle of the discharge automatic valve 306 and the sluice valve 308, a maintenance valve 307 is installed ahead of the branch, and the maintenance valve 307 is always closed except during maintenance.

Various detectors are installed in various places inside the compressor in order for the control device 703 to determine whether the operating state of the compressor is normal and to control the operation of the compressor. Suction pressure sensor 501 on 401, low pressure stage discharge air temperature sensor 505 on low pressure stage discharge air path 402, high pressure stage suction air pressure sensor 502 on high pressure stage suction air path 403, high pressure stage suction air temperature sensor 506, high pressure A high-pressure stage discharge air temperature sensor 507 is provided on the stage discharge air path 404, and a discharge air pressure sensor 503 is provided on the discharge air path 405. Further, the oil pressure sensor 504 and the oil temperature sensor 508 are provided on the main oil supply path 414.

Further, in order to detect the oil level position of the lubricating oil stored in the speed increasing device case 104, the oil level gauge case 112 including the oil level position detector 509 connects the lower communication passage 113 and the upper communication passage 114. It is connected to the speed increasing device case 104 via these passages, and the oil level position in the speed increasing device case 104 and the oil level position in the oil level gauge case 112 become the same height. The oil level position detector 509 can detect the same oil level position as the speed increasing device case 104. In addition, OL is an actual oil level height, and HH, HM, and HL are predetermined oil level heights that serve as a reference, which will be described later, and are high, medium, and low reference oil level heights, respectively. show.

The operation of the compressor is input to the display / input device 701, and the control device 703 outputs the control output of all the electrical and electronic devices of the compressor based on the input value. Further, the control device 703 receives inputs from various detectors inside the compressor, and monitors, determines, and controls the operating state of the compressor based on a program set in the storage device 702 in advance. In FIG. 1, the control lines of the control device 703, various electrical and electronic devices, and various detectors are omitted.

The antenna 704 is a radio for transmitting and receiving values detected by various detection devices built in the compressor 100 and information stored in the storage device 702 to an external server 802 via the communication network 801. It is a transmitter / receiver.

A viewer at a remote location (not shown) can browse the information of the compressor stored in the external server 802 via various information terminals.

FIG. 2 is a maintenance menu screen used by the compressor operator in the present embodiment in the display / input device 701. In FIG. 2, on the maintenance menu screen 900, a plurality of buttons such as an oil change mode button 902a, a test run mode button 902b, another maintenance A mode button 902c, and another maintenance B mode button 902d are displayed at the same time. .. The maintenance menu screen 900 also displays the current discharge air pressure display 901, so that the operator can check the current discharge air pressure even while operating the maintenance menu. When changing the lubricating oil, the operator selects the oil change mode button 902a to display the oil change mode screen 910 of FIG. 3, and the processing flow of the oil change mode shown below is started.

4A and 4B are flowcharts of the oil exchange mode performed by the compressor of FIG. 1 in this embodiment. Note that FIGS. 4A and 4B are connected at a connection point A, and although it is a series of flowcharts, it is divided into two due to space limitations.

Compressors generally require lubricating oil for their drive components, and the lubricating oil needs to be replaced regularly because of the increase in operating time and deterioration over time. The oil change mode executed in this embodiment is a function that enables easy and reliable proper change of lubricating oil regardless of the experience and proficiency of the compressor user and maintenance worker.

In FIGS. 4A and 4B, the oil change mode is roughly composed of a first step ST1 for discharging the lubricating oil inside the compressor and a second step ST2 for performing the lubricating oil replenishment operation.

First, the first step ST1 in FIG. 4A will be described. In FIG. 4A, as the procedure S101, the compressor displays the oil change mode screen 910 shown in FIG. 3 on the display / input device 701, and the oil change "Open the oil drain valve" which is the first work instruction is displayed on the display. The mode message 903a, the work completion button 905, and the stop button 906 are displayed at the same time, and the operator is asked to select either button. The work completion button 905 or the stop button 906 can be selected by the operator by touching the displayed portion.

The procedure S102 is a procedure for determining according to the input result of the procedure S101. When the operator selects the work completion button 905, it is determined that the first work instruction, that is, the oil drain valve operation work has been completed, and the process proceeds to the next procedure S103. If the operator selects the stop button 906, it is determined that the oil change mode is stopped, and the process returns to the first maintenance menu screen 900.

In step S103, the compressor performs an oil drainage promoting operation for promoting the discharge of lubricating oil. Depending on the structure of the compressor, it may take time to drain the lubricating oil, and if new lubricating oil is replenished when the deteriorated old lubricating oil is not sufficiently discharged, the deterioration of the new lubricating oil may be accelerated. be. In order to prevent such a situation, by operating the compressor for a short time, it is possible to promote the discharge of the lubricating oil and shorten the time until the discharge is completed.

In this embodiment, the compressor is a variable speed compressor in which a frequency conversion device such as an inverter (not shown) is built in the control device 703, and when the procedure S103 is executed, the inverter discharges the electric power having the minimum operating frequency fmin. The oil is supplied to the motor 103 only for an operating time of to seconds, and the motor 103 rotates at a rotation speed corresponding to the minimum operating frequency fmin. Since the oil pump 105 is driven by the rotation of the motor 103 via the oil pump pinion 109 and the oil pump gear 110, the lubricating oil inside the compressor is discharged in a shorter time than when only the oil discharge valve 309 is opened. can do.

The minimum operating frequency fmin is the smallest operating frequency that the compressor can operate, but it only promotes the discharge of lubricating oil, and lubricates the drive parts inside the compressor during the oil draining operation. It is not necessary to drive at high speeds as oil is rarely supplied and should be avoided as much as possible. For the same reason, the oil drainage operation time to may be as short as about ten and several seconds.

On the other hand, in the case of a constant-speed compressor that is not controlled by a frequency converter such as an inverter and power is always supplied at a constant frequency in the power supply equipment, even if the oil is drained in step S103, the compressor Since the motor 103 of the above is rotated at a rotation speed according to the frequency (50 Hz or 60 Hz) of the power supply equipment, the oil drainage operation time to of the constant speed type compressor is set shorter than that of the variable speed type. Is desirable.

After executing the procedure S103, the subroutine SR1 is executed to determine whether or not the lubricating oil has been discharged without any problem. The subroutine is a function defined separately from the main program, and is for reading the function appropriately in the main program and executing the procedure in the subroutine.

In the procedure SR101 in the subroutine SR1, after the motor 103 is stopped, a "oil drainage completion confirmation" button for causing the operator to input that the oil drainage completion has been confirmed is displayed on the display / input device 701. In the next step SR102, when there is an input for confirming the completion of oil drainage and the actual oil level OL detected by the oil level position detector 509 is lower than the low oil level height HL, the process proceeds to step SR103. Make a conditional judgment. If the actual oil level height OL is equal to or higher than the low oil level height HL, "incomplete oil drainage" is displayed on the display / input device 701 as a display indicating the state of the compressor in the procedure SR104 at the same time. , The oil draining operation re-execution button for re-execution of the oil draining operation operation and the stop button for stopping the oil draining operation operation are displayed, and the operator is allowed to select either one. If the stop button is selected in the procedure SR105, the oil drainage operation operation is stopped in the procedure SR106, and the process returns to the maintenance menu screen 900. When the oil draining operation re-execution button is selected, the process returns to step S101, and the above-described procedure is restarted from the beginning of the oil change mode.

In the procedure SR103, the display / input device 701 is displayed as "power must be shut off when performing other maintenance", and at the same time, the operator is asked to confirm the intention to continue the oil change work. Display the "Continue" button and the "Perform other maintenance" button to suspend the oil change work and confirm the intention to perform other maintenance. Generally, when the lubricating oil is replaced, regular maintenance such as cleaning / replacement of the strainer 602 and replacement of the oil filter 603 is often performed at the same time, and these regular maintenances are performed after the lubricating oil is discharged. Work efficiency is better.

The procedure SR107 determines whether or not the "continue oil change work" button is selected, and if so, completes the first step ST1 and proceeds to the next second step ST2. If not, that is, if the "Perform other maintenance" button is selected, the procedure proceeds to SR108, the display / input device 701 is displayed with the instruction "Turn off power", and at the same time, the compressor status flag is displayed. Set the FS to "1", which indicates the temporary suspension of the oil change work, and save it. The state flag FS is stored in the non-volatile memory inside the storage device 702 so that the stored value can be retained even after the power is cut off. If it is determined in step SR109 that the power has been turned off and turned on again by the operator, the process proceeds to the next step SR110. If the state flag FS = 1 is determined in step SR110, the first step ST1 is completed and the next step is completed. Proceed to 2-step ST2. If FS = 1, the normal monitor screen displayed when the compressor is turned on is displayed in step SR111, and the oil change mode is canceled.

Next, the second step ST2 will be described with reference to FIG. 4B. In FIG. 4B, in step S201, the compressor displays the second predetermined work instruction "Refuel until the oil level reaches the upper limit of the oil level gauge" on the display / input device 701, and at the same time, the operator is described above. A work completion button 905 for confirming that the refueling work has been completed and a stop button 906 for canceling the oil change mode are displayed. The oil level position can be visually confirmed through a visual oil level gauge in which a part of the oil level gauge case 112 is transparent, and the visual oil level position and the actual oil level position detector 509 detect the oil level position. The oil level height OL is almost the same. In step S202, it is determined whether or not the work completion button 905 is selected, and if the work completion button 905 is selected, the process proceeds to step S203. When the stop button 906 is selected, the process proceeds to step S204, the oil change mode is stopped, and the maintenance menu screen 900 is returned.

In step S203, the control device 703 instructs the inverter to supply electric power at the minimum operating frequency fmin, drives the motor 103 at a rotation speed corresponding to the minimum operating frequency fmin, and drives the oil pump 105. The operation of the motor 103 is performed for the oil filling operation time of ti seconds, and then stopped. As a result, the lubricating oil stored in the lower part of the speed increasing device case 104 can be filled in the lubricating oil system inside the compressor.

Next, the subroutine SR2 for determining whether the amount of refueling is sufficient is executed. After the procedure S203 is performed, the amount of lubricating oil stored in the speed increasing device case 104 is reduced, so that the actual oil level OL is lower than the oil level immediately after refueling performed in accordance with the second predetermined work instruction. In some cases. In step SR201, if the actual oil level OL after the oil filling operation operation according to step S203 is higher than the medium oil level height HM (OL> HM), it is determined that the cumulative amount of refueling is sufficient, and the process proceeds to step SR203. If this is not the case, it is determined that the amount of refueling is insufficient, so the procedure is returned immediately before step S201.

If the actual oil level height OL is higher than the high oil level height HH (OL> HH) in the procedure SR203, it means that the cumulative amount of refueling is too large. Open the oil drain valve and lower the oil level below the upper limit of the oil level gauge. " According to this display, the operator opens the oil drain valve 309 and discharges excess lubricating oil, and in step SR205, the actual oil level OL is lower than the high oil level HH (OL <HH). If is detected, the process proceeds to the procedure SR206, the work instruction "Close the oil drain valve" is displayed on the display / input device 701, and then the procedure SR207 is performed, and "Oil change completed" is displayed on the display / input device 701. The display is displayed, the second step ST2 is completed, and the oil change mode is completed.

If OL> HH is not satisfied in step SR203, it is determined that HH ≧ OL> HM and the amount of refueling is appropriate, the process proceeds to step SR207, "oil change completed" is displayed, and the oil change mode is completed. And.

In this way, the second step ST2 makes it possible to complete the oil change work with an appropriate amount of lubricating oil, resulting in poor lubrication of the drive parts of the compressor due to insufficient filling amount of lubricating oil and problems due to an increase in lubrication temperature. Or, it is possible to prevent the occurrence of an unfavorable phenomenon such as an increase in power consumption due to stirring of the lubricating oil due to an excessive filling amount, and the work can be performed according to the work instruction displayed on the display / input device 701. Therefore, the compressor can be operated. Persons and maintenance workers can change the oil without referring to the manuals of other instruction manuals. In addition, since the control device 703 can display the work instruction on the display / input device 701 based on the oil level position detected by the oil level position detector 509, the operator can visually check the oil level gauge the number of times. Since it is reduced, it can contribute to the improvement of work efficiency.

As described above, according to the present embodiment, it is possible to determine the completion of the work based on the physical quantity of the operation result together with the work procedure, and proceed with the process while confirming the actual operation state. Therefore, it is possible to provide a fluid machine capable of performing maintenance of the fluid machine more safely, reliably, and efficiently while reducing the influence of the operator's sense, familiarity, and experience as much as possible.

This embodiment describes a test run mode executed by the compressor.

FIG. 5 is a test run mode screen in this embodiment. The test run mode screen 920 is displayed by selecting the test run mode button on the maintenance menu screen 900 in FIG. 2, and the processing flow of the test run mode shown below is started.

6A, 6B, and 6C are flowcharts of the test run mode executed by the compressor shown in FIG. 1 in this embodiment. Note that FIGS. 6A, 6B, and 6C are connected at connection points A and B, and although it is a series of flowcharts, it is divided into three due to space limitations.

The test run mode is a function suitable for operating the compressor for the first time after replacing, for example, the low-pressure stage compressor main body 101, the high-pressure stage compressor main body 102, or both.

In the test run mode in this embodiment, the first to nth first steps ST1 to nth steps STn are carried out. Here, n represents a natural number. The outline of each step is as follows: after displaying the work instruction for the operation of the maintenance valve 307 on the display / input device 701 and confirming that the operation of the maintenance valve 307 is completed, the compressor is continuously operated for a certain period of time at a predetermined pressure. However, it is configured to execute the subroutine SR as to whether or not there is no problem in proceeding to the next step after a certain period of time has elapsed.

When the low-pressure stage compressor body 101, the high-pressure stage compressor body 102, or both are replaced with new ones and then operated for the first time, that is, when a trial run is performed, the parts inside the new compressor body are familiar. In order to prevent the occurrence of unexpected malfunctions, the discharge air pressure Pd detected by the discharge air pressure sensor 503 is gradually increased from the atmospheric pressure, and finally the rated discharge of the compressor is performed. It is preferable to reach the air pressure.

In this embodiment, assuming that the rated discharge air pressure Pdr of the compressor is 0.93 MPa (the pressure means the gauge pressure unless otherwise specified), the number n of steps to be executed in the trial run mode is, for example, one step. Assuming that the assumed pressure rise value ΔPa is 0.2 MPa,
n = Pdr / ΔPa = 0.93 / 0.2 = 4.65 ≒ 5
Is required as. Therefore, the required number of steps is 5, and a method of gradually increasing the discharge air pressure Pd from the first step ST1 to the fifth step ST5 to perform the familiar operation of the compressor main body can be considered. The n is a natural number after rounding or rounding down, although the rated discharge fluid pressure is divided by the assumed pressure rise value and rounded up to the nearest whole number.

The hypothetical pressure increase value ΔPa = 0.2 MPa was used in the calculation of the number of steps n, but the actual pressure increase value ΔP is calculated by using the number of steps n = 5.
ΔP = Pdr / n = 0.93 / 5 = 0.186 MPa
Therefore, using this actual pressure rise ΔP, the target first to fifth predetermined pressures P1 to P5 in each step become
P1 = 0 + ΔPd = 0 + 0.186 ≈ 0.19 MPa
P2 = Pd1 + ΔPd = 0.186 + 0.186 = 0.372 ≈ 0.37 MPa
P3 = Pd2 + ΔPd = 0.372 + 0.186 = 0.558 ≈ 0.56 MPa
P4 = Pd3 + ΔPd = 0.558 + 0.186 = 0.744 ≈ 0.74 MPa
P5 = Pd4 + ΔPd = 0.744 + 0.186 = 0.93 MPa
Is required.

First, the first step ST1 in FIG. 6A will be described. In FIG. 6A, first, when the test run mode button 902b is selected on the maintenance menu screen 900 of FIG. 2, the first step ST1 which is the first step is started, and the display / input device 701 is displayed in the procedure S101. The test run mode screen 920 shown in the above is displayed, and the test run mode message 903b such as "Open the maintenance valve fully" is displayed as the first work instruction. The stop button 906 for canceling the test run mode is displayed. Next, if the work completion button 905 is selected in step S102, the process proceeds to the next step S103. If not, that is, if the stop button 906 is selected, the test run mode is stopped in step S104. , Return to the maintenance menu screen 900.

In step S103, as the first predetermined operation, the control device 703 supplies electric power of the rated operating frequency fr from the inverter to the motor 103, the motor 103 rotates at a rotation speed corresponding to the rated operating frequency fr, and the low pressure stage compressor main body. It drives 101 and the high-pressure stage compressor main body 102. At the same time, the timer tc inside the control device 703 is cleared to zero, counting is started, and the process proceeds to the next subroutine SR1.

In the procedure SR101 in the subroutine SR1 of FIG. 6A, if the discharge air pressure Pd detected by the discharge air pressure sensor 503 is the first predetermined pressure P1 or less (Pd ≦ P1), the process proceeds to the procedure SR102, and in the procedure SR102, the timer tk If the value of is larger than the determination time tt (tk> tt), the first step ST1 is ended, and the process proceeds to the next second step ST2. This is because if the discharge air pressure Pd suddenly becomes a large pressure, the familiar operation does not occur, so it is determined whether the discharge air pressure Pd is lower than the first predetermined pressure P1 which is the minimum pressure at first.

In the procedure SR101, if the discharge air pressure Pd is larger than the first predetermined pressure P1 (Pd> P1), the process proceeds to the procedure SR103. In the procedure SR103, a display calling attention such as "confirm that there is no abnormal noise or abnormal vibration" is displayed on the display / input device 701, and a "confirmation" button for inputting that it has been confirmed that there is no abnormality, and an abnormality Display the "Abnormal" button to input that the situation is occurring. If it is determined in step SR104 that the "confirmation" button has been selected, the process proceeds to step SR102, and if the value of the timer ct is larger than the determination time tt (tk> tt), the first step ST1 is terminated. , Proceed to the next second step ST2. If the "confirmation" button is not selected in the procedure SR104, that is, if the "abnormality" button is selected, the process proceeds to the procedure SR105, the operation of the motor 103 is stopped, and at the same time, an alarm is displayed on the display / input device 701. I do.

When the discharge air pressure Pd is larger than the first predetermined pressure P1 (Pd> P1), the reason for displaying the caution in the procedure SR103 to confirm that there is no abnormal noise or abnormal vibration is that the discharge air is gradually increased in the trial run mode. This is because if abnormal noise or abnormal vibration is generated due to the pressure rising above a predetermined air pressure, it is preferable to immediately stop the operation of the compressor from the viewpoint of protecting the machine.

Since it is preferable to start the discharge air pressure in the test run mode from a pressure as close to the atmospheric pressure as possible, the operator is instructed to fully open the maintenance valve 307 in ST1 which is the first step. In order to fully open the maintenance valve 307, the discharge air pressure Pd at this time is the discharge air pressure obtained by adding the pressure loss from the discharge air path inside the compressor to the maintenance valve 307. Generally, the discharge air pressure Pd when the maintenance valve 307 is fully opened is expected to be about 0.05 to 0.15 MPa, but the position of the maintenance valve 307 differs depending on the installation environment of the compressor, and the maintenance valve 307 is compressed. If the compressor is installed at a relatively distant position from the machine, the pressure loss increases, so the discharge air pressure Pd when the maintenance valve 307 is fully opened rises, and in some cases, it may be higher than the first predetermined pressure P1. be. In such a situation, it is effective to prompt the operator to confirm the presence or absence of abnormal noise or abnormal vibration as a material for determining whether to continue the test run mode in the procedure SR103.

In the subroutine SR1, the first predetermined pressure P1 is set to 0.19 MPa by the above-mentioned calculation method. The determination time tt means the minimum continuous operation time of the compressor at the discharge air pressure Pd, and for example, tt = 10 minutes. If continuous operation is performed for this determination time, it is determined that the temperatures of the parts inside the low-pressure stage compressor main body 101 and the high-pressure stage compressor main body 102 are substantially stable, and that the familiar operation at a predetermined pressure is sufficient. Further, as described above, the procedures SR103 to SR105 determine whether or not the test run mode should be continued when the discharge air pressure Pd becomes higher than the first predetermined pressure P1, and the operator makes an abnormal noise or abnormal vibration. This is a procedure for confirming the presence or absence of the compressor and determining whether to continue the test run mode or stop the compressor.

Proceeding to the second step ST2 in FIG. 6B, in the procedure S201, as a second work instruction, an instruction such as "Adjust the discharge air pressure to" P2 "MPa" is displayed on the display / input device 701, and at the same time, the above. A work completion button 905 for causing the operator to input the completion of the work and a stop button 906 for inputting the cancellation of the test run mode are displayed. In the next step S202, if it is determined that the work completion button 905 is selected, the process proceeds to the next step S203, and if the stop button 906 is selected, the process proceeds to the procedure S204, where the test run mode is stopped and maintenance is performed. Return to the menu screen 900.

In the procedure S203, the motor 103 is driven at the rated operating frequency fr as the second predetermined operation, but after the operation is started in the procedure S103 of the first step ST1, the operation is continuous without stopping. Further, here, the timer tc is once cleared to zero and the counting is started again to secure the time required for the familiar operation at the second predetermined pressure.

Subroutine SR2 is executed after step S203, but only the condition determination part regarding the discharge air pressure Pd is different from the subroutine SR1 of FIG. 6A.

In the procedure SR201, the discharge air pressure Pd is P2-0.01 or more and P2 + 0.01 or less (P2-0.01 ≦ Pd ≦ P2 + 0. If the condition of 01) is satisfied, the process proceeds to the procedure SR202, and if the value of the timer ct is larger than the determination time tt (tk> tt), the second step ST2 is terminated and the process proceeds to the next step. If the discharge air pressure Pd does not satisfy the above conditions, the process proceeds to the procedure SR203.

In the procedure SR203, if the discharge air pressure Pd is larger than the second predetermined pressure P2 + 0.01, the process proceeds to the procedure SR204, and if not, the process returns immediately before the procedure SR201. In the procedure SR204, as in the step ST1, a display / input device 701 is displayed to call attention such as "confirm that there is no abnormal noise or abnormal vibration", and the display / input device 701 is made to input that it has been confirmed that there is no abnormality. Display the "Confirm" button and the "Abnormal" button to input that the situation is abnormal. If it is determined in step SR205 that the "confirmation" button has been selected, the process proceeds to step SR202, and if the value of the timer ct is larger than the determination time tt (tk> tt), the second step ST2 is terminated. , Proceed to the next third step ST3. If the "confirmation" button is not selected in the procedure SR205, that is, if the "abnormality" button is selected, the process proceeds to the procedure SR206, the operation of the motor 103 is stopped, and at the same time, an alarm is displayed on the display / input device 701. I do.

Here, in the condition determination of the pressure value in the procedure SR201 and the procedure SR203, the target second predetermined pressure P2 is provided with a margin of 0.01 MPa as an error absorption of the pressure adjustment. This is because of the problem of the discharge air pressure sensor 503 and the sensitivity of the valve operation manually by the operator, if an attempt is made to adjust to the predetermined pressure P2 without any error, it takes time to adjust, or even if the pressure is once adjusted to the predetermined pressure. This is because the value of the discharged air pressure may deviate slightly due to changes in atmospheric pressure and ambient temperature. If the margin is about ± 0.01 MPa, there is no particular effect on the familiar operation of the compressor body, and providing the margin as an adjustment allowance can contribute to shortening the working time.

According to this configuration, if the time for performing the familiar operation in a state where the discharge air pressure Pd is substantially equal to the second predetermined pressure P2 is longer than the determination time tt, it is determined that the familiar operation at the second predetermined pressure P2 can be secured. be able to.

As described above, when the rated discharge air pressure Pdr = 0.93 MPa, it is necessary to increase the discharge air pressure Pd to the rated discharge air pressure Pdr up to the fifth step ST5. Here, in each of the steps ST3, ST4, and ST5 after the second step ST2, only the predetermined pressure that is the target pressure in the second step ST2 is changed to P3, P4, and P5, and the procedure itself is the same. Further, the subroutines SR3, SR4, and SR5 in each step are the same as the subroutine SR2 except that the predetermined pressures P3, P4, and P5 are changed.

FIG. 6C shows the nth step STn in a general form. If the value of the timer ct is larger than the determination time tt (tk> tt) in the procedure SRn02, the process proceeds to the procedure S105 and “test run completed” is displayed. Then, the trial run mode is completed.

As an effect in this embodiment, the influence of the difference between the operators regarding the operation of gradually increasing the pressure up to the rated discharge air pressure Pdr can be eliminated as much as possible.

For example, in the case of one worker, the stepwise pressure rise value ΔP may be made too small and it may take a long time to complete the test run, while in the case of another worker, the pressure rise value ΔP may be set. If it is made too large, or if the pressure is increased while the familiar operation time under each predetermined pressure is insufficient, there is a possibility that an unexpected failure of the compressor body may occur.

On the other hand, according to this embodiment, the discharge air pressure Pd is rated by setting a series of sequential operations of instructing each work, accepting input for confirmation, operating the compressor, and determining the conditions as one step. By repeating the above steps until the discharge air pressure becomes Pdr, the operator simply operates the valve according to the work instruction displayed on the display / input device 701 of the compressor and adjusts the pressure to reduce the pressure. It is possible to secure a sufficient time for the familiar operation of the low-pressure stage compressor main body 101 and the high-pressure stage compressor main body 102 in the above, and to complete the trial run more reliably.

As described above, according to the present embodiment, as in the case of the first embodiment, the completion of the work is judged based on the physical quantity of the operation result together with the work procedure, and the process is proceeded while confirming the actual operation state. Can be done. Therefore, it is possible to provide a fluid machine capable of performing maintenance of the fluid machine more safely, reliably, and efficiently while reducing the influence of the operator's sense, familiarity, and experience as much as possible.

Although the examples have been described above, even if there is an operation input to the compressor from a remote operation device existing separately from the compressor during the execution of the predetermined maintenance mode described in each embodiment, other than the emergency stop input. It is advisable not to accept the input to the fluid machine, but to accept the general operation input only through the input device (display and input device) installed in the fluid machine.

For example, when the operator opens the oil drain valve 309 and is performing the oil drain work while the oil change mode is being executed, an operation signal is input to the compressor from the remote operating device, and the compressor starts operation. Then, a large amount of lubricating oil may be ejected from the oil drain valve 309 to pollute the surroundings of the compressor with the lubricating oil, or the drive parts inside the compressor may be insufficiently lubricated, resulting in a compressor failure. There is. Therefore, even if there is an operation input from a remote control device while the oil change mode is being executed, it is better for the operator to not accept the input so that the operator can work more safely and there is a possibility of product failure. Is preferable because it can eliminate.

Further, in the first embodiment, if the oil level detected by the oil level detector 509 is different from the oil level visually observed by the operator, whether or not the function of the oil level detector 509 is invalidated. When the options are displayed on the display / input device 701 and the function is disabled, the work instruction for instructing the filling of the specified amount of oil, the oil filling operation, and the visual oil level height are the predetermined conditions. A series of sequential operations of displaying a message confirming whether or not the condition is satisfied and displaying the input unit of the confirmation on the display / input device 701 may be repeated until the predetermined condition is satisfied.

Further, the present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the hydraulic machine described in the first embodiment has been described by taking a two-stage oil-free screw air compressor as an example, but the present invention is not limited to this type of fluid machine, and is simply provided with only one compressor body. A stage compressor may be used, or lubricating oil is applied to the compression chamber inside the compressor body for the purpose of cooling and sealing the compressed air and lubricating the sliding surfaces of a pair of male and female screw rotors (not shown). It can also be applied to a refueling compressor that injects.

Generally, a refueling compressor does not require an oil pump, but this is because the lubricating oil is cooled by the pressure of the compressed air from the oil reservoir through the lubricating oil path with an oil cooler, and then lubricated again. This is because when air is sucked in from the outside air through the oil path, it can be returned to the space where the pressure is negative inside the compressor body, and oil can be supplied to the inside of the compressor body. Although the refueling compressor has the above-mentioned structural differences from the two-stage oil-free screw air compressor described in the first embodiment, each maintenance mode described in each embodiment can be applied without any problem. be.

Similarly, the compression method is not limited to the twin screw type including a pair of male and female screw rotors in the first embodiment, but is also a single screw type composed of one screw rotor and a plurality of gate rotors, a tooth type, a reciprocating type, etc. It is also applicable to all positive displacement compressors and centrifugal and axial turbo compressors.

Further, in the embodiment, the oil change mode and the test run mode have been described as an example, but it can be carried out by applying the same program structure to other maintenance work.

The screen configurations shown in FIGS. 3, 3, and 5 are merely examples, and visual expressions such as the display position, display content, character size, language type, and color combination of each item are shown. Various forms and combinations can be assumed. The message 903a in the oil change mode and the message 903b in the test run mode display appropriate contents programmed in advance when a predetermined procedure and conditions are satisfied. In addition to the work completion button 905 and the stop button 906, as described above, the oil drainage operation re-execution button in the oil change mode, the confirmation button in the test run mode, etc. are displayed on the screen when the predetermined procedure and conditions are met. It is not limited to the button of a specific function.

100: Compressor, 101: Low pressure stage compressor body, 102: High pressure stage compressor body, 103: Motor, 104: Accelerator case, 112: Oil level gauge case, 307: Maintenance valve, 509: Oil level position detection Instrument, 701: Display and input device, 702: Storage device, 703: Control device, 900: Maintenance menu screen, 902a: Oil change mode button, 902b: Trial run mode button, 902c: Maintenance A mode button, 902d: Maintenance B mode Button, 903a: Oil change mode message, 903b: Test run mode message, 905: Work complete button, 906: Stop button, 910: Oil change mode screen, 920: Test run mode screen, HH: High oil level, HM : Medium oil level height, HL: Low oil level height, OL: Actual oil level height.

Claims (8)

A fluid machine equipped with a compressor body, a drive device for driving the compressor body, and a display / input device.
A control device that controls the operation of the fluid machine and
It has a detection device that detects the state of the fluid machine.
When a predetermined maintenance mode is selected via the display / input device, the control device confirms to the display / input device that the first work is instructed and the completion of the first work is completed. When the input unit is displayed and the completion of the first work is input via the input unit, the fluid machine performs the first predetermined operation, and the physical quantity detected by the detection device and the display / input device are displayed. The first step is the first step of a series of sequential operations for determining whether or not the first predetermined operation is completed by an input operation, and the nth step nth set in advance is performed in order from the first step. Hydraulic machine. The fluid machine according to claim 1.
It has an oil level position detector that detects the oil level height inside the oil storage container.
When the oil change mode is selected by the display / input device, the control device displays an oil draining work instruction and an input unit for inputting the completion of the oil draining work on the display / input device, and discharges the oil. When the completion of the oil work is input, a series of sequential operations that stop after executing the oil drainage promotion operation is set as the first step, and then the refueling work instruction and the input unit for inputting the completion of the refueling work are described above. When the display and input device displays and the completion of the refueling work is input, the oil filling operation is executed and then stopped, and the oil level detected by the oil level position detector sets the condition of the predetermined oil level. The second step is a series of sequential operations for determining whether or not the conditions are satisfied, and the sequence of the second step until the oil level detected by the oil level position detector satisfies the predetermined oil level condition. A fluid machine characterized by repeating operations. The fluid machine according to claim 1.
When the trial run mode is selected by the display / input device, the control device displays a first work instruction for instructing the full opening of the valve and an input unit for inputting the completion of the first work on the display / input device. Then, when the completion of the first work is input, the count of the timer is started at the same time as the operation is started, and the condition is determined whether the value of the timer exceeds the predetermined time and the discharge fluid pressure is equal to or less than the first predetermined pressure. The first step is a series of sequential operations for performing the above steps, and then a second work instruction for instructing the operation of the valve so that the discharge fluid pressure becomes the second predetermined pressure, and an input unit for inputting the completion of the second work. Is displayed on the display / input device, and when the completion of the second work is input, the operation is continued and at the same time, the count of the timer is restarted from zero, the value of the timer exceeds the predetermined time, and the pressure is discharged. The second step is a series of sequential operations for determining whether or not the fluid pressure is approximately equal to the second predetermined pressure, and from the next step onward, the discharge fluid pressure is approximately equal to the rated pressure of the fluid machine. A fluid machine characterized by repeating the same sequential operation as in the second step. The fluid machine according to claim 2.
Has a non-volatile storage device
The control device stores information on the progress of the oil change mode in the storage device, and when the power supply to the fluid machine is cut off in the procedure in the middle of the oil change mode, and then when the power supply is restarted, The progress information is reloaded, a sentence requesting confirmation of intention to continue the oil change mode, and an input unit for confirmation of intention are displayed on the display / input device, and the confirmation of intention is input. If so, a fluid machine characterized by displaying the next required work instruction and input section, or performing the operations required for oil change. The fluid machine according to claim 1.
During the execution of the predetermined maintenance mode, the control device does not accept any input to the fluid machine other than the emergency stop input from the remote operation device existing separately from the fluid machine, and the control device is installed in the fluid machine. A fluid machine characterized by accepting general operational inputs only via a display and input device. The fluid machine according to claim 2.
When the oil level detected by the oil level detector and the visible oil level are different, the control device displays an option of whether to invalidate the function of the oil level detector. When the function is disabled by displaying it on the dual-input device, it is confirmed whether the work instruction for instructing the filling of the specified amount of oil, the oil filling operation, and the visual oil level satisfy the predetermined conditions. A fluid machine characterized in that a series of sequential operations of displaying a message to be sent and an input unit for confirmation on the display / input device are repeated until a predetermined condition is satisfied. The fluid machine according to claim 3.
When the commissioning mode is executed, the number n for repeating up to the nth step of the series of sequential operations is the rated discharge fluid pressure of the fluid machine divided by the assumed pressure rise value, rounded up to the nearest whole number, or A fluid machine characterized by rounding or rounding down to a natural number. It is a maintenance method for fluid machinery.
A work instruction and an input unit for inputting the completion of the work are displayed on the display / input device, and when there is an input via the input unit, the fluid machine executes a predetermined operation operation, and then A maintenance method for a hydraulic machine, characterized in that a series of sequential operations of determining conditions is one step, and the steps are repeated a predetermined number of times.

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