WO2021153111A1 - 可搬型空気圧縮機、および可搬型空気圧縮機の制御方法 - Google Patents

可搬型空気圧縮機、および可搬型空気圧縮機の制御方法 Download PDF

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Publication number
WO2021153111A1
WO2021153111A1 PCT/JP2020/048123 JP2020048123W WO2021153111A1 WO 2021153111 A1 WO2021153111 A1 WO 2021153111A1 JP 2020048123 W JP2020048123 W JP 2020048123W WO 2021153111 A1 WO2021153111 A1 WO 2021153111A1
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Prior art keywords
air compressor
portable air
temperature
value
temperature sensor
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Ceased
Application number
PCT/JP2020/048123
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English (en)
French (fr)
Japanese (ja)
Inventor
光 内田
瑛人 大畠
浩介 須藤
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Publication of WO2021153111A1 publication Critical patent/WO2021153111A1/ja
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Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

Definitions

  • the present invention relates to a portable air compressor and a control method for the portable air compressor.
  • Patent Document 1 it is used for an air tool in order to prevent the winding temperature of the motor from excessively rising in an air compressor that controls the rotation speed of the motor in multiple stages according to the pressure of the air tank.
  • Controls a tank unit that stores compressed air, a compressed air generation unit that generates compressed air and supplies it to the tank unit, a drive unit that has a motor for driving the compressed air generation unit, and a drive unit.
  • It has a control circuit unit for the purpose and a temperature sensor that detects the temperature of the motor of the drive unit, and the control circuit unit is configured to control the rotation speed of the motor in a plurality of stages according to the detection signal of the temperature sensor. Is described.
  • Patent Document 1 describes a configuration in which the rotation speed is controlled in a plurality of stages in order to prevent the temperature of the motor winding portion from rising in the portable air compressor.
  • a portable air compressor that can reduce the operating load in a high temperature environment as compared with the conventional one and can be used stably even in a high temperature environment, and a control method for the portable air compressor. offer.
  • the present invention includes a plurality of means for solving the above problems.
  • a portable air compressor that is portable and is arranged on a tank for storing gas and the tank.
  • the compression unit driven by the motor unit
  • the first temperature sensor arranged around the coil of the motor unit and measuring the temperature of the motor unit
  • the portable air compressor Around the motor unit, the compression unit driven by the motor unit, the first temperature sensor arranged around the coil of the motor unit and measuring the temperature of the motor unit, and the portable air compressor.
  • a second temperature sensor for measuring the temperature and a correction value obtained by correcting the measured value of the second temperature sensor when the value of the first temperature sensor exceeds the first threshold value are used, and the value of the first temperature sensor is the value of the first temperature sensor.
  • the motor unit is provided with a control board for controlling the operation of the motor unit by using the measured value of the second temperature sensor.
  • the operating load in a high temperature environment can be reduced as compared with the conventional case, and the product can be used stably even in a high temperature environment. Issues, configurations and effects other than those mentioned above will be clarified by the description of the following examples.
  • FIG. 2 is a cross-sectional view taken along the line AA'in FIG. It is a figure which shows the schematic structure of the control base of the portable air compressor which concerns on Example 1.
  • FIG. It is a figure which shows the outline of the operation mode of the portable air compressor which concerns on Example 1.
  • FIG. It is a figure which shows an example of the normal operation pattern of the portable air compressor which concerns on Example 1.
  • FIG. It is a figure which shows an example of the limited operation pattern when the ambient temperature of the portable air compressor which concerns on Example 1 is high.
  • FIG. It is a flowchart which shows the flow of the operation control in the portable air compressor which concerns on Example 1.
  • FIG. It is a figure which shows an example of the limited operation pattern when the ambient temperature of the portable air compressor which concerns on Example 2 to which this invention is applied is high.
  • Example 1 The portable air compressor according to the first embodiment to which the present invention is applied and the control method of the portable air compressor will be described with reference to FIGS. 1 to 8.
  • FIG. 1 is a view showing a cross-sectional state of the main body of the portable air compressor 36
  • FIG. 2 is a view showing an example of the appearance of the portable air compressor 36
  • FIG. 3 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 4 is a diagram showing a schematic structure of a control system of the portable air compressor 36.
  • the portable air compressor 36 that can be carried can be roughly divided into a compressor main body 1 that compresses air, a motor 6 that drives the compressor main body 1, and a cooling fan 10. ,
  • the area surrounded by the large dotted line frame is the compressor main body 1 that compresses air
  • the area surrounded by the small dotted line frame is the motor 6 that drives the compressor main body 1.
  • the compressor body 1 includes a crankcase 1A and cylinders 18A and 18B attached to the crankcase 1A.
  • the shaft (rotating shaft) 6A of the motor 6 penetrates into the crankcase 1A.
  • the crankcase 1A covers the compressor body 1 and the motor 6.
  • the stator 2 is directly fixed to one end side of the crankcase 1A.
  • the crankcase 1A is equipped with a bearing 3 that pivotally supports the shaft 6A, and a bearing box 5 mounted with a bearing 4 that pivotally supports the shaft 6A is fitted on the side opposite to the mounting side of the stator 2. It has a structure.
  • a key 12 is embedded in the central part of the shaft 6A penetrating the inside of the crankcase 1A.
  • the shaft 6A in which the key 12 is embedded is inserted into a connecting rod set 14A having a piston ring 13A for sealing and compressing air together with a balance 17 via a bearing 15A and an eccentric 16A eccentric.
  • a connecting rod set 14B having a piston ring 13B for sealing and compressing air is also inserted into the shaft 6A via an eccentric 16B eccentric with the bearing 15B.
  • the connecting rod sets 14A and 14B and the balance 17 are supported from both sides by two bearings 3 and 4 mounted on the crankcase 1A and the bearing box 5. With this structure, the connecting rod sets 14A and 14B are rotatably connected to the eccentric 16A and 16B via bearings 15A and 15B.
  • the low-pressure side cylinder 18A and the high-pressure side cylinder 18B, a total of two cylinders 18A and 18B, are attached so as to face each other with the crankcase 1A in between.
  • the cylinder 18A includes a flange 19A, an air valve 20A, a cylinder head 21A, and a through bolt 22A.
  • the flange 19A is provided in the crankcase 1A for attaching the cylinder 18A, and the cylinder 18A, the air valve 20A, and the cylinder head 21A are fixed to the flange 19A by the through bolts 22A to provide the compression chamber 23A on the low pressure side. Is forming.
  • the cylinder 18B includes a flange 19B, an air valve 20B, a cylinder head 21B, and a through bolt 22B.
  • the flange 19B is also provided in the crankcase 1A for attaching the cylinder 18B, and the cylinder 18B, the air valve 20B, and the cylinder head 21B are fixed to the flange 19B by the through bolts 22B, so that the compression chamber 23B on the high pressure side is used. Is forming.
  • the shaft 6A driven by the rotational movement of the motor 6, the eccentric 16A, 16B driven by the rotation of the shaft 6A, the connecting rods 14A, 14B, the flanges 19A, 19B, the air valves 20A, 20B, and the cylinder.
  • the heads 21A and 21B form a compression unit.
  • the piston rings 13A and 13B are provided in the connecting rod assembly 14A that reciprocates in the low pressure side cylinder 18A and the connecting rod assembly 14B that reciprocates in the high pressure side cylinder 18B is described.
  • the piston ring can be provided only on one of them, for example, the high pressure side.
  • the motor 6 has a stator 2, a bearing 3, a shaft 6A, a key 7, a rotor 8, and a washer 9, and a cooling fan 10 is attached to the end of the shaft 6A. Further, a rotor 8 is mounted on one end side of the shaft 6A via a key 7. The rotor 8 is axially fixed by a fan shaft 11 for attaching a washer 9 and a cooling fan 10.
  • the cooling fan 10 supplies cooling air to the inside of the cooling cover 26 to cool each component of the portable air compressor 36 such as the compressor main body 1, the motor 6, and the air tanks 24 and 25.
  • the cooling fan 10 is also provided at the end of the shaft 6A by the fan shaft 11, and rotates with the rotation of the shaft 6A driven by the motor 6.
  • the operation unit 34 has a plurality of switches 34a, and is configured to be able to give various operation instructions for operating the portable air compressor 36 such as turning on the power and changing the operation mode. Has been done. Further, the operation unit 34 is provided with a display unit 34b composed of an LED or the like for displaying an operating state of the portable air compressor 36 or the like. In this embodiment, in particular, the actual measurement value of the temperature / rotation speed sensor 33, the actual measurement value of the temperature sensor 35, or the correction value, which will be described later, is displayed.
  • the switch board 40 replaces various instructions regarding the operation of the worker in the operation unit 34 with control signals and outputs the control signals to the control group 30, and the operation mode input from the control group 30.
  • the display control of the display unit 34b is performed based on the information signal of the operating state based on the information of the above and the pressure sensor 31, the temperature sensor 32, the temperature / rotation speed sensor 33, and the temperature sensor 35, which will be described later.
  • the air tanks 24 and 25 for storing the compressed air are arranged in the lower part of the compressor main body 1 covered by the cooling cover 26.
  • a control set 30 for controlling the operation of the portable air compressor 36, a motor 6 and the like are arranged between the two air tanks 24 and 25.
  • control group 30 As shown in FIG. 4, power is supplied from the power supply unit 41, and the compressor main body 1 is operated by driving the motor 6.
  • the inside of the control group 30 is composed of a CPU (Central Processing Unit) 30a and the like composed of a converter 30b, a capacitor 30c, a switching element 30d, a microcomputer and the like.
  • the converter 30b converts the AC voltage supplied from the power supply unit 41 into a DC voltage, and the DC voltage smoothed by the capacitor 30c is converted into AC power by the switching element 30d.
  • the CPU 30a operates the motor 6 based on various instructions of the worker input from the switch board 40 by the operation of the operation unit 34 and the detection results of the temperature sensor 32, the temperature / rotation speed sensor 33, and the temperature sensor 35. The state is determined, and the drive control signal for realizing the determined operating state is calculated. Then, the CPU 30a outputs the calculated drive control signal to the switching element 30d to drive the switching element 30d.
  • the portable air compressor 36 of this embodiment adopts the pressure operation control method, as shown in FIGS. 3 and 4, the pressure sensed by the pressure sensor 31 attached to the air tank 24 The operation control is performed by the control group 30 according to the above.
  • control set 30 is provided with a temperature sensor 32.
  • the temperature sensor 32 monitors the temperature of the control group 30, and when the temperature sensor 32 detects a predetermined temperature, the control group 30 stops the operation of the portable air compressor 36 and displays the display unit 34b of the operation unit 34. Turns on and notifies the worker that an error has occurred.
  • the motor 6 is provided with a temperature / rotation speed sensor 33.
  • the temperature / rotation speed sensor 33 is arranged around the coil of the motor 6 to monitor the coil temperature of the motor 6 and the rotation speed of the motor 6, and when a predetermined temperature is detected, the control group 30 uses the portable air.
  • the operation of the compressor 36 is stopped, the display unit 34b of the operation unit 34 is turned on, and the worker is notified that an error has occurred.
  • the rotation speed information detected by the temperature / rotation speed sensor 33 is always sent to the control group 30, but the motor 6 does not rotate even if the operation button of the portable air compressor 36 provided in the operation unit 34 is pressed. If there is an abnormality, the display unit 34b of the operation unit 34 is turned on to notify the worker that an error has occurred.
  • a temperature sensor 35 is provided around the operation unit 34.
  • the temperature sensor 35 includes a thermistor or the like that monitors the ambient temperature of the portable air compressor 36.
  • the portable air compressor 36 as in this embodiment is often used outdoors, and the temperature environment changes significantly.
  • the control group 30 automatically lowers the maximum pressure to protect the product by limiting the operation.
  • the portable air compressor 36 used for a nail gun or the like is generally provided with several patterns of operation modes according to the work content and environment, and the operation mode uses a pressure control range change or a switching element 30d. It is often set by changing the number of revolutions.
  • Pressure control means that the operation of the compressor is stopped when the pressure of the air tanks 24 and 25 reaches the predetermined set pressure, and the compressor is restarted when the pressure of the air tanks 24 and 25 falls below the predetermined set pressure. It is the operation control to be made to.
  • the portable air compressor 36 of this embodiment is provided with three operation modes: a normal mode, a powerful mode, and a low speed operation mode.
  • two pressure control ranges are set.
  • the rotation speed of the motor 6 is variable from 1800 to 2850 min -1 , and the operation is stopped when the pressure in the air tank 24 reaches 4.2 MPa and restarted when the pressure reaches 3.2 MPa.
  • the powerful mode is an operation mode in which the rotation speed range of the motor 6 is variable as in the normal mode, and the pressure control range is set to 3.8 MPa to 4.2 MPa.
  • the low-speed operation mode is an operation mode in which the pressure control range is the same as that of the normal mode and the rotation speed of the motor 6 is fixed at 1500 min -1.
  • the restart pressure of the compressor is set high, and when a small amount of stored compressed air is used, the compressor restarts and starts filling the air tanks 24 and 25. Therefore, this is an effective operation mode when the amount of compressed air used is large.
  • the operating conditions of the compressor in which wear is promoted are that the temperature of the piston rings 13A and 13B is high and a large load is applied to the piston rings 13A and 13B, that is, the ambient environment temperature is high and continuous operation is performed at a high pressure. If it is done.
  • the upper limit of the operating temperature range of the machine is set to 40 ° C. based on the life calculation results and reliability test results of each part.
  • continuous operation in a high temperature environment may affect each control element of the control unit.
  • the continuous operation generates heat in the compression section and heat in each control element due to the current load.
  • some capacitors have a maximum operating temperature of 85 ° C, and there is no problem in considering heat generation at the maximum operating temperature of 40 ° C of the compressor, but if the ambient temperature is higher than that, it will exceed 85 ° C. There is also. For this reason, there is a possibility that the control element may be damaged, the hot melt adhesive fixing the control element may be redissolved, and the coil in the control group 30 may fall off due to the vibration of the compressor. There was room for improvement.
  • FIG. 6 is a diagram showing an example of a normal operation pattern
  • FIG. 7 is a diagram showing an example of a limited operation pattern when the ambient temperature of the compressor is high
  • FIG. 8 is a flowchart showing a flow of operation control.
  • the temperature sensor 32 is provided in the control group 30 and the temperature / rotation speed sensor 33 is provided in the motor 6 for product protection. There is. In this machine, operation control is performed to stop when the coil temperature of the control group 30 or the motor 6 reaches a specified value.
  • the temperature of the coils of the control group 30 and the motor 6 is a part where the temperature changes extremely depending on the presence or absence of operation, and it is difficult to detect the ambient temperature of the compressor by the above-mentioned detection unit. Therefore, in order to more accurately grasp the ambient temperature of the compressor, a temperature sensor 35 is added to the operation unit 34 to determine whether or not the ambient temperature is within the usable temperature range of the portable air compressor 36.
  • a control mode for lowering the stop pressure P2 is added when the ambient temperature exceeds the operating temperature range.
  • the stop pressure is reduced from P2 to P4 (for example, 4). Reduce from .2 MPa to 3.2 MPa).
  • the restart pressure P1 since the restart pressure P1 becomes the same as P4 or the difference becomes extremely small, the restart pressure P1 is also lowered to P3 in order to suppress the frequent switching between operation and stop.
  • the stop pressure of 4.2 MPa and the restart pressure of 3.2 MPa in the normal mode is changed to the stop pressure 3. Change to 2 MPa and restart pressure 2.5 MPa.
  • the amount of pressure drop may be a uniform value for each mode, or may be a different value for each mode.
  • the compression ratio of the compressor is lowered, and the amount of heat generated by the compression is reduced, so that the temperature rise of the cylinders 18A and 18B and the piston rings 13A and 13B can be suppressed.
  • the coil temperature of the control group 30 and the motor 6 can be lowered, and even if the worker uses the cylinder 18A, 18B and the piston ring in a high temperature environment, the cylinder 18A, 18B and the piston ring can be lowered. It is possible to suppress the temperature rise of each component such as 13A, 13B, the control set 30, and the coil of the motor 6, which leads to prevention of damage.
  • the operation unit 34 has little temperature change depending on the presence or absence of operation, and is therefore very suitable as a place where a temperature sensor for measuring the ambient temperature is installed.
  • the temperature tends to rise by that amount, but the temperature of the operation unit 34 hardly rises due to the current value.
  • the threshold value of the temperature sensor 35 when the threshold value of the temperature sensor 35 is set to an ambient temperature of 40 ° C., the temperature of the operation unit 34 is gradually increased by continuous operation in an environment where the ambient temperature is 35 ° C., and as a result, the ambient temperature rises. It was also clarified that there is a problem that the temperature is not exceeded 40 ° C., but it is erroneously determined to be abnormal and the temperature is changed to the high temperature mode.
  • the temperature / rotation speed sensor 33 attached to the motor 6 is used to fluctuate the measured value of the temperature sensor 35 of the operation unit 34 to change the external temperature regardless of the operating state of the compressor. Make an accurate judgment and implement restricted operation.
  • V is the power supply voltage
  • T1 is the measured value of the temperature sensor 35 of the operation unit 34
  • T2 is the T1 correction value
  • A is the correction constant
  • Ts1 is the temperature sensor 35 threshold 1 (second threshold)
  • Ts2 is.
  • Ts3 is the abnormal threshold value of the temperature sensor 35
  • T3 is the measured value of the temperature / rotation speed sensor 33
  • Tm is the threshold value (first threshold value) of the temperature / rotation speed sensor 33.
  • the control group 30 determines whether or not the temperature measurement value T3 of the temperature / rotation speed sensor 33 attached to the coil of the motor 6 exceeds the threshold value Tm (step S11). When it is determined that the threshold value Tm is not exceeded, the control group 30 assumes that the compressor is not operating or has just been operated, proceeds to step S12, and advances the process to the measured value T1 equal ambient temperature of the temperature sensor 35. Let it be T2 (step S12). After that, the process proceeds to step S14.
  • step S11 when it is determined in step S11 that the temperature measurement value T3 exceeds the threshold value Tm, the process proceeds to step S13, and it is considered that the compressor has been or has been continuously operated for a certain period of time.
  • the temperature sensor 35 that detects the ambient temperature treats it as measuring a value higher than the external temperature.
  • control group 30 corrects the measured value of the ambient temperature by the correction constant in the control group 30, for example, the difference between the measured value T1 of the temperature sensor 35 and the preset value A is set as the correction value T2 ( Step S13). After that, the process proceeds to step S14.
  • control group 30 determines whether or not the ambient temperature correction value T2 exceeds the threshold value 1Ts1 (step S14). If it is determined that the amount is exceeded, the process proceeds to step S15, and if it is not determined that the amount is exceeded, the process is returned to step S11.
  • step S14 When it is determined in step S14 that the ambient temperature correction value T2 exceeds the threshold value 1Ts1, the control group 30 determines that the ambient temperature is high, and the control group 30 limits the operation of the compressor (warning mode (high temperature)). ) (Step S15). In step S15, it is desirable that the control group 30 transmits an instruction signal for displaying an abnormality to the display unit 34b. In addition, it is desirable to reduce the stop pressure of the compression unit and the restart pressure.
  • step S16 determines whether or not the ambient temperature correction value T2 is below the threshold value 2Ts2 (step S16).
  • This step S16 is a step for determining whether or not the operation mode is in a state where the high temperature mode can be exited.
  • the process proceeds to step S17, the operation mode is returned from the high temperature mode to the normal operation mode (step S17), and the process is returned to step S11.
  • step S16 when it is not determined in step S16 that the ambient temperature correction value T2 is lower than the threshold value 2Ts2, the process proceeds to step S18, and the control group 30 has the ambient temperature correction value T2 exceeding the abnormal threshold value Ts3. It is determined whether or not the temperature is increased (step S18). When it is determined that the abnormality threshold value Ts3 is exceeded, it is determined that the ambient temperature is such that the compressor cannot operate, the process proceeds to step S19, and the compressor is abnormally stopped (step S19). On the other hand, when it is not determined that the value is exceeded, the process is returned to step S15.
  • the connecting rod set 14A reciprocates in the compression chamber 23A by the eccentric 16A.
  • the connecting rod assembly 14A sucks air into the compression chamber 23A through the cylinder head 21A and the air valve 20A, and conversely, in the discharge step toward the top dead center, the sucked air is compressed.
  • the structure is such that the air is discharged through the air valve 20A and the cylinder head 21A.
  • the air discharged through the cylinder head 21A is sent to the other cylinder 18B.
  • the shaft 6A rotates, and in the suction step from the top dead center to the bottom dead center, the connecting rod assembly 14B sucks the air compressed by the cylinder 18A into the compression chamber 23B through the cylinder head 21B and the air valve 20B.
  • the sucked air is further compressed and discharged through the air valve 20B and the cylinder head 21B.
  • the exhaled compressed air is stored in the air tanks 24 and 25.
  • the air is efficiently compressed by performing two-stage compression in which the air compressed by one cylinder 18A is further compressed by the other cylinder 18B.
  • the pressure ratios on the low-pressure side and the high-pressure side are smaller than in the case of the one-stage compression, so that the compression efficiency is improved and the heat generated in the compressed portion can be reduced.
  • the portable air compressor 36 includes the air tanks 24 and 25 for storing gas, the motor 6 arranged on the air tanks 24 and 25, and the motor 6.
  • a driven compression unit a temperature / rotation speed sensor 33 arranged around the coil of the motor 6 to measure the temperature of the motor 6, a temperature sensor 35 to measure the ambient temperature of the portable air compressor 36, and a temperature.
  • the value of the rotation speed sensor 33 exceeds the first threshold value, the correction value corrected by the measured value of the temperature sensor 35 is used, and when the value of the temperature / rotation speed sensor 33 is equal to or less than the first threshold value, the measured value of the temperature sensor 35 is used.
  • a control set 30 for controlling the operation of the motor 6 is provided.
  • the ambient temperature of the compressor can be accurately detected regardless of the operating state of the portable air compressor 36.
  • driving can be restricted more safely than in the past. Therefore, as compared with the conventional case, it is possible to suppress wear and damage of various parts such as stoppage due to an error, wear of the piston rings 13A and 13B, and damage of the control set 30.
  • the operation unit 34 for operating the portable air compressor 36 is further provided and the temperature sensor 35 is arranged around the operation unit 34, the wiring with the control set 30 and the switch board 40 can be shortened as much as possible. Therefore, it is possible to suppress the occurrence of problems such as damage to the wiring, and it is possible to realize more stable operation.
  • the worker can easily check the operating state of the portable air compressor 36. It can be grasped and work efficiency can be improved.
  • the control group 30 transmits an instruction signal for displaying an abnormality to the display unit 34b, so that the worker can perform portable air compression. It is possible to easily grasp that the operation of the machine 36 is restricted, and it becomes possible to take measures such as interruption of work in some cases. Therefore, it is possible to prevent the compressor from being continuously operated in a harsh environment.
  • control group 30 reduces the stopping pressure of the compression unit to promote wear of the piston rings 13A and 13B and various types of capacitors in the control group 30. It is possible to suppress damage to parts more than before.
  • control group 30 when the measured value or the correction value exceeds the second threshold value, the same effect can be obtained by lowering the restart pressure of the compression unit, and the operation is frequently stopped and restarted. It is possible to suppress switching to, and further reduce the operating load.
  • the location of the temperature sensor 35 is not limited to the periphery of the operation unit 34, and the compressor It can be appropriately placed in a place that is not easily affected by the internal temperature.
  • FIG. 9 is a diagram showing an example of a limited operation pattern when the ambient temperature of the portable air compressor 36 according to the second embodiment is high.
  • control group 30 is controlled to reduce the stop pressure and the restart pressure together when the measured value or the correction value exceeds the second threshold value.
  • a limited operation mode was added to reduce the maximum stop pressure P2 and the restart pressure P1 when operating in a high temperature environment.
  • the rotation speed is controlled by the target rotation speed set by each pressure. For example the pressure 2,300Min -1 longitudinal At 1.5 MPa, are set with 2,100Min -1 longitudinal At 2.3 MPa.
  • the program sets the target rotation speed so that it changes linearly. As a result, the amount of protruding air of the compressor was secured within the range not exceeding the rated current value.
  • the control group 30 reduces the rotation speed of the motor 6 in order to reduce the rotation speed during operation in a high temperature environment in which the measured value or the correction value exceeds the second threshold value. Change from variable speed to constant speed.
  • the rotation speed is set to a range faster than the low-speed operation mode and slower than the variable operation mode, so that the work efficiency is not reduced as much as the low-speed operation mode, and compared with the limited operation mode of the first embodiment.
  • the load is further reduced, which leads to a decrease in the current value and a further suppression of the temperature rise of the control group 30.
  • FIG. 9 shows a more specific operation pattern of rotation speed control. As shown in FIG. 9, during normal operation, there are target rotation speeds R1 and R2 for pressures P1 and P2 in the air tanks 24 and 25, respectively, and a value linearly interpolated between them is the target rotation speed.
  • the rotation speed in the normal mode and the powerful mode changes from 1,850 to 2,850 min -1
  • the low speed operation mode is constant at 1,500 min -1. Therefore, by setting the constant speed between 1,850 and 1,500 min-1 , the load on the compressor is further reduced, and the current value is significantly reduced. As a result, the temperature of the control group 30 can be further reduced, and the load of the control group 30 can be further reduced.
  • control method for the portable air compressor and the portable air compressor according to the second embodiment of the present invention is almost the same as the control method for the portable air compressor and the portable air compressor according to the first embodiment described above. The effect is obtained.
  • the control group 30 continuously changes the rotation speed of the motor 6 from the variable type to the constant speed within a range in which the compressor does not interfere with various parts.
  • the operation can be repeated, and abnormal stoppage is suppressed as much as possible even in a situation where the operating environment is harsher, such as when the outside air temperature is high. For this reason, although there are some restrictions, it is possible to maintain a certain level of work efficiency even in a harsh operating environment, and it is possible to avoid major problems such as interruption of the work itself, further improving the work efficiency of workers. Can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
PCT/JP2020/048123 2020-01-30 2020-12-23 可搬型空気圧縮機、および可搬型空気圧縮機の制御方法 Ceased WO2021153111A1 (ja)

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JPH05133341A (ja) * 1991-11-13 1993-05-28 Tokico Ltd 圧縮機
JP2004316504A (ja) * 2003-04-15 2004-11-11 Hitachi Koki Co Ltd 空気圧縮機及びその制御方法
JP2009525423A (ja) * 2006-01-31 2009-07-09 アトラス コプコ エアーパワー，ナームローゼ フェンノートシャップ 改良された圧縮機装置
JP2015048732A (ja) * 2013-08-30 2015-03-16 日立工機株式会社 空気圧縮機

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Publication number Priority date Publication date Assignee Title
JPH05133341A (ja) * 1991-11-13 1993-05-28 Tokico Ltd 圧縮機
JP2004316504A (ja) * 2003-04-15 2004-11-11 Hitachi Koki Co Ltd 空気圧縮機及びその制御方法
JP2009525423A (ja) * 2006-01-31 2009-07-09 アトラス コプコ エアーパワー，ナームローゼ フェンノートシャップ 改良された圧縮機装置
JP2015048732A (ja) * 2013-08-30 2015-03-16 日立工機株式会社 空気圧縮機

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