JP6007570B2 - air compressor - Google Patents

Description

  The present invention relates to an air compressor, and more particularly to an air compressor that can reduce a load on a motor when the motor is started.

  In recent years, in the field of air compressors, the pressure inside the tank tends to increase and the sealing performance of the compressor tends to improve, so that air that was in the middle of compression when the compressor was stopped does not leak from the compressor. When it is left and restarted, there may be a problem that the motor is locked due to insufficient force to push up the air in the compressor that is already at high pressure in the compression direction.

  If the motor is locked, the motor generates heat, but the cooling fan connected to the motor cannot rotate, so that the motor is not sufficiently cooled, and the thermal protector is activated to cause an error. Furthermore, if the thermal protector is activated and an error occurs, the compressor cannot be operated until the motor cools, so that the user's work is interrupted and the work efficiency is lowered.

  In order to avoid such a problem, there is known a device provided with a vent hole for avoiding a high load at startup (for example, Patent Document 1).

  In addition, there is also known one in which the hole is made small so that the compression efficiency does not decrease even if an air vent hole is provided (for example, Patent Document 2).

  By providing the air vent hole in this way, it is possible to remove high-pressure air that is remaining in the compressor when the motor is stopped and is being compressed. As a result, even if the piston stops while moving in the compression direction and attempts to start again from this state, the high-pressure air that is being compressed is discharged from the air vent hole, so the force that pushes up the piston is insufficient. Thus, the problem that the motor is locked can be avoided.

JP-A-57-24477 JP 2001-50159 A

  However, in the conventional air compressor described above, an air vent hole is formed in the upper part of the cylinder or in the piston so that the air is surely vented regardless of the position where the piston is stopped. However, there is a problem in that the pressure does not drop immediately after the motor stops. Even if the motor is locked, if the air does not escape immediately, the restart is repeated, and the motor may generate heat during that time and may not start.

  In addition, in the case of a small-diameter hole, there is a problem that the hole is blocked by foreign matter.

  Then, this invention makes it a subject to provide the air compressor which can extract the high pressure air which remained in the compressor reliably, without reducing compression efficiency.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.

That is, the air compressor according to claim 1 includes a compression mechanism that compresses air by reciprocating a piston in a cylinder, a motor that drives the compression mechanism, and a control unit that controls the operation of the motor. The cylinder is provided with an air vent hole between the top dead center and the bottom dead center of the piston, and the internal space of the cylinder communicates with the outside of the cylinder through the air vent hole. executable der Bleed processing for sliding the piston to the position where the is, in the air vent process, and wherein the sliding said piston at a slower than during the compression operation speed.

(Claim 2)
The invention according to claim 2, characterized by the following points.

That is, a compression mechanism that compresses air by reciprocating a piston in a cylinder, a motor that drives the compression mechanism, and a control unit that controls the operation of the motor, the cylinder includes the piston An air vent hole is formed between the top dead center and the bottom dead center, and the air vent for sliding the piston to a position where the internal space of the cylinder communicates with the outside of the cylinder through the air vent hole. Processing can be executed, and the control means reversely rotates the motor to execute the air bleeding processing .

(Claim 3)
The invention according to claim 3, characterized by the following points.

That is, a compression mechanism that compresses air by reciprocating a piston in a cylinder, a motor that drives the compression mechanism, and a control unit that controls the operation of the motor, the cylinder includes the piston An air vent hole is formed between the top dead center and the bottom dead center, and the air vent for sliding the piston to a position where the internal space of the cylinder communicates with the outside of the cylinder through the air vent hole. A process can be executed, and the control means executes the air bleeding process when the activation of the motor fails .
(Claim 4)
The invention according to claim 4, characterized by the following points.

That is, a compression mechanism that compresses air by reciprocating a piston in a cylinder, a motor that drives the compression mechanism, and a control unit that controls the operation of the motor, the cylinder includes the piston An air vent hole is formed between the top dead center and the bottom dead center, and the air vent for sliding the piston to a position where the internal space of the cylinder communicates with the outside of the cylinder through the air vent hole. A process can be executed, and the control means executes the air bleeding process after waiting for a predetermined time when the motor fails to start .

(Claim 5)
The invention according to claim 5, characterized by the following points.

That is, a compression mechanism that compresses air by reciprocating a piston in a cylinder, a motor that drives the compression mechanism, and a control unit that controls the operation of the motor, the cylinder includes the piston An air vent hole is formed between the top dead center and the bottom dead center, and the air vent for sliding the piston to a position where the internal space of the cylinder communicates with the outside of the cylinder through the air vent hole. A process can be executed, and the control means waits for a predetermined time after the air bleeding process is performed, and then starts the motor .

(Claim 6)
The invention described in claim 6 is characterized by the following points in addition to the features of the invention described in any one of claims 1-5.

That is, in the air bleeding process, the piston is stopped at a position where the internal space of the cylinder communicates with the outside of the cylinder through the air bleeding hole .

(Claim 7)
The invention described in claim 7 is characterized by the following points in addition to the characteristics of the invention described in any one of claims 1-6 .

That is, the control means operates the motor to execute the air bleeding process .

The present invention is as described above, and the cylinder is provided with an air vent hole between a top dead center and a bottom dead center of the piston, and the internal space of the cylinder passes through the air vent hole. An air bleeding process for sliding the piston to a position communicating with the outside can be executed. For this reason, even if the piston stops at a position where air cannot be vented, the air venting process is executed and air can be vented reliably.

Further, in the prior SL air bleeding process, if such an inner space of the cylinder to stop the piston at a position communicates with the outside of the cylinder through the air vent hole, because the time for communicating sufficiently secured, Air bleeding can be performed reliably.

Further, in the prior SL air bleeding process, be caused to slide the piston at a slower than during the compression operation speed, even if a piston in a position that can not air bleeding has stopped, the air bleeding process execution Thus, air can be surely removed.

The front Symbol controller, if allowed to operate the motor so as to perform the air bleeding process, can be performed Bleed processing at an arbitrary timing, performs the air vent always processed when for example a motor stop It is possible to perform the air bleeding process at the time of starting.

The front Symbol control means, when to perform the air bleeding process reverses the motor, perform air removal process when the motor is locked insufficient force to push up the high-pressure air in the compression direction In this case, since the piston can be easily operated not by operating the motor in the forward rotation direction where the load is high but by rotating the motor in the reverse direction, the air can be surely removed.

The front Symbol control means, when to perform the air bleeding process when it fails to start the motor, it is possible to perform the air bleeding process only when necessary.

The front Symbol control means, when to perform the air bleeding process after waiting a predetermined time for failure to execute the motor, the pressure was reduced by lowering the temperature during the waiting time, more It is possible to reliably remove the residual pressure and to make the motor start up with certainty.

The front Symbol control means, after performing the air vent process, if after waiting a predetermined time so as to start the motor, the pressure is reduced by lowering the temperature during the waiting time, more reliably The residual pressure can be removed and the motor can be started successfully.

It is sectional drawing which shows a compression mechanism. It is a partially expanded sectional view near the piston of a secondary compression mechanism. It is a partially expanded sectional view of the vicinity of the piston of the secondary compression mechanism, and is a view before the air bleeding process. It is a partially expanded sectional view of the vicinity of the piston of the secondary compression mechanism, and is a view after the air bleeding process. It is a main flow figure of an air compressor. It is a flowchart which shows the starting process of an air compressor. It is a flowchart which shows the air bleeding process of an air compressor. It is a table | surface which shows the threshold value which detects the lock | rock of a motor.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a compression mechanism of an air compressor according to the present embodiment. As shown in FIG. 1, a motor case 12 is integrally formed at the front end of the crankcase 11, and a motor 13 is disposed in the motor case 12.

  The motor 13 is a DC brushless motor that rotates the rotating shaft 16 by an electromagnetic force that acts between the rotor 14 and the stator 15, and is driven by inverter control. The stator 15 is composed of a stator coil or the like, and surrounds the rotor 14 from the outer peripheral side. The rotor 14 is made of a permanent magnet or the like and is provided integrally with the rotary shaft 16. The rotating shaft 16 is rotatably supported by a bearing.

  The rotary shaft 16 is extended inside the crankcase 11, and two eccentric plates are fixed in the crankcase 11.

  One of the eccentric plates is a primary eccentric plate 22 connected to a primary connecting rod 23 constituting the primary compression mechanism 20 via a bearing, and the other eccentric plate is a secondary connecting member constituting the secondary compression mechanism 30. This is a secondary eccentric plate 32 connected to the rod 33 via a bearing. The primary connecting rod 23 is connected to the primary piston 24 of the primary compression mechanism 20, and the secondary connecting rod 33 is connected to the secondary piston 34 of the secondary compression mechanism 30. The primary piston 24 of the primary compression mechanism 20 is slidably accommodated in the cylindrical primary cylinder 21, and the secondary piston 34 of the secondary compression mechanism 30 is slidably accommodated in the cylindrical secondary cylinder 31. ing.

  The air compressor according to the present embodiment includes two compression mechanisms, the primary compression mechanism 20 and the secondary compression mechanism 30 described above, so that two-stage compression can be performed.

  That is, air is introduced into the primary cylinder 21 of the primary compression mechanism 20, and the air is introduced into the crankcase 11 from an intake hole (not shown) formed in the crankcase cap of the crankcase 11. It is configured to be introduced into the primary cylinder 21 through an introduction hole (not shown) with a check valve formed through the primary piston 24 of the primary compression mechanism 20. The primary compression mechanism 20 and the secondary compression mechanism 30 are connected via a pipe, and the air compressed by the primary compression mechanism 20 passes through the pipe and is a check valve formed through the secondary piston 34. It is taken into the secondary cylinder 31 from the attached introduction hole (not shown) and further compressed. The air compressed by the secondary compression mechanism 30 is sent to an air tank and stored.

  The primary compression mechanism 20 and the secondary compression mechanism 30 are disposed on opposite sides of the rotary shaft 16, and the secondary compression mechanism 30 is secondary when the primary piston 24 of the primary compression mechanism 20 is in the compression process. Air compression is performed alternately so that the piston 34 is in the intake process and the secondary piston 34 of the secondary compression mechanism 30 is in the compression process when the primary piston 24 of the primary compression mechanism 20 is in the intake process. Yes.

  In the above configuration, when the motor 13 is operated, the rotating shaft 16 rotates, so that the primary eccentric mechanism 22 converts the rotational motion into the linear reciprocating motion by the primary eccentric plate 22 and the primary connecting rod 23, and the primary piston 24 moves to the primary cylinder 21. Reciprocates inside. When the primary piston 24 moves backward in the intake process, the space in the primary cylinder 21 suddenly expands and the inside becomes negative pressure, the introduction hole is opened, and the air in the crankcase 11 is introduced into the primary cylinder 21. . Next, when the primary piston 24 moves forward in the compression step, the space in the crankcase 11 suddenly expands, so that air is taken into the crankcase 11 and at the same time the space in the primary cylinder 21 contracts. Therefore, the introduction hole is closed, and a discharge port (not shown) formed in the primary cylinder 21 is opened to discharge compressed air. The discharged primary pressure air is supplied to the secondary cylinder 31 of the secondary compression mechanism 30 through a pipe. The primary pressure air in the secondary cylinder 31 is further compressed to a high pressure by a secondary piston 34 that reciprocates in the same manner, discharged as secondary pressure air, supplied to an air tank, and stored.

  The operation of such an air compressor is controlled by control means built in the air compressor.

  Although not particularly shown, this control means is mainly configured by a CPU and includes a ROM, a RAM, an I / O, and the like. Then, the CPU is configured to control various input devices and output devices by reading a program stored in the ROM.

  This control means refers to, for example, a pressure value measured by a pressure sensor provided in the tank, and controls the operation of the motor 13 so that the air pressure in the tank becomes an appropriate pressure, so that the compression mechanism 20/30 is turned ON / OFF. Specifically, the control means operates the motor 13 until the pressure in the tank reaches a predetermined OFF pressure (for example, 1.5 MPa), and stops the operation of the motor 13 when the pressure reaches the OFF pressure. Thereafter, when the compressed air in the tank is used and the pressure in the tank reaches a predetermined ON pressure (for example, 1.1 MPa), the motor 13 is repeatedly operated until the pressure in the tank becomes the OFF pressure.

  FIG. 2 is an enlarged cross-sectional view of the vicinity of the secondary piston 34 according to the present embodiment. As shown in FIG. 2, a lip ring 40 for sealing between the secondary cylinder 31 and the secondary piston 34 is provided at the tip of the secondary piston 34. The lip ring 40 is pressed from above by a disc-shaped ring presser 41 and fixed to the secondary piston 34. The lip ring 40 is formed of a material such as synthetic resin or synthetic rubber, and is an annular member that is continuous and continuous throughout the entire circumference.

  A circumferential groove is provided on the side wall of the ring retainer 41, and a ring spring 42 is fitted in the circumferential groove. The ring spring 42 urges the lip ring 40 from the inside so as to push the lip ring 40 outward in order to securely seal the gap between the secondary piston 34 and the secondary cylinder 31.

  The peripheral wall of the secondary cylinder 31 is provided with an air vent hole 31 a that can communicate with the atmosphere between the top dead center and the bottom dead center of the secondary piston 34. The air vent hole 31 a is a fine hole that is always in communication with the inside of the crankcase 11, and is provided to gradually leak the secondary pressure air to the outside when the motor 13 is stopped.

  However, since the air vent hole 31a is provided between the top dead center and the bottom dead center of the secondary piston 34, for example, as shown in FIG. 3, the lip ring 40 blocks the air vent hole 31a. The secondary piston 34 may stop at the position. In this case, the air vent from the air vent hole 31a is not immediately performed. (If the time elapses, the secondary piston 34 is lowered by the air pressure remaining in the secondary cylinder 31, and the air is vented. There are cases). If the motor 13 is started in such a state where the air is not released, the force for pushing the high-pressure air in the compression direction may be insufficient and the motor 13 may be locked.

  In the compressor according to the present embodiment, even when the motor 13 is locked in this way, as shown in FIG. 4, the internal space of the secondary cylinder 31 reaches the position where it communicates with the outside of the secondary cylinder 31. By executing the air bleeding process for sliding the next piston 34, the air can be surely removed.

  Hereinafter, the air bleeding process will be described in detail with reference to the flowcharts of FIGS.

(Main process)
FIG. 5 is a flow of the main process.

  In this main process, power is first turned on in step S100. Then, the process proceeds to step S101.

  In step S101, it is checked whether the power switch is ON and the pressure value in the tank is lower than a predetermined ON pressure. If the power switch is ON and the pressure value in the tank is lower than the predetermined ON pressure, the process proceeds to step S102. On the other hand, if not, the process returns to step S101 and waits until the power switch is ON and the pressure value in the tank becomes lower than a predetermined ON pressure.

  In step S102, an activation process for activating the motor 13 and starting the compression process is executed. Then, the process proceeds to step S103.

  In step S103, it is checked whether an error has been set in the startup process. If an error is set, the process proceeds to step S104 to enter an error state. On the other hand, if no error is set, the process proceeds to step S105.

  In step S105, it is checked whether the power switch is OFF or the pressure value in the tank is higher than a predetermined OFF pressure. If the power switch is OFF or the pressure value in the tank is higher than a predetermined OFF pressure, the process proceeds to step S107. On the other hand, if not, the process proceeds to step S106.

  When the process proceeds to step S106, it is checked whether an error is detected. If an error is detected, the process proceeds to step S107. On the other hand, if not, the process returns to step S105 and waits until the power switch is turned off or the pressure value in the tank becomes higher than a predetermined OFF pressure.

  When it progresses to step S107, a motor brake is applied, the motor 13 is stopped, and compression operation is complete | finished.

(Start process)
Next, the activation process will be described with reference to FIG.

  First, in step S200 shown in FIG. 6, the retry count is reset to “0”. Then, the process proceeds to step S201.

  In step S201, activation of the motor 13 is started by the control means. Then, the process proceeds to step S202.

  In step S202, it is checked whether the lock of the motor 13 has been detected (whether the motor 13 has failed to start). Specifically, the rotation speed of the motor 13 is measured by a Hall IC or the like, and the lock of the motor 13 is detected by comparing the rotation speed with a predetermined threshold value. The threshold values used for lock detection are as shown in FIG. 8. If it is less than 1 second from the start of activation of the motor 13, it is determined that the motor 13 is locked at 167 rpm or less. In the case of 1 second or more after the start of the start of the motor 13, if it is 750 rpm or less, it is determined that the motor 13 is locked. If the lock of the motor 13 is detected, the process proceeds to step S203. On the other hand, when the lock of the motor 13 is not detected, the routine returns because the motor 13 is normally started.

  When the process proceeds to step S203, since the lock of the motor 13 is detected, the motor 13 is stopped by applying a motor brake. Then, the process proceeds to step S204.

  In step S204, the retry count is incremented by “1”. Then, the process proceeds to step S205.

  In step S205, it is checked whether the retry count is “4”. If the retry count is “4”, the process proceeds to step S206. On the other hand, when the retry count is not “4” (when the number of retries is less than 4), the process proceeds to step S207.

  When the process proceeds to step S206, since the air bleeding process described later has already been executed three times, error information is written in the RAM and the process returns. In this case, it is determined that an error is set in the return destination step S103, and an error state is entered.

On the other hand, when it progresses to step S207, it waits by the waiting time according to the retry count (it waits for the predetermined time when starting of the motor 13 fails). Specifically, when the retry count is “1” (before the first air bleeding process), there is no waiting time, and when the retry count is “2” or “3” (the second or third air Wait for a waiting time of 25 seconds before the removal process. Then, the process proceeds to step S208.

  In step S208, an air bleeding process is executed. Then, the process returns to step S201.

  As described above, in the start-up process of the present embodiment, the air bleeding process is executed a maximum of three times when the lock of the motor 13 is detected.

  Further, by waiting for a waiting time corresponding to the number of retries, the air temperature in the secondary cylinder 31 is lowered with the passage of time to reduce the pressure, and the success probability of the retry is improved.

(Air bleeding process)
Next, the air bleeding process will be described with reference to FIG.

  First, in step S300 shown in FIG. 7, the reverse operation timer is reset to “0” and time measurement is started. In addition, the excitation count is reset to “0”. Then, the process proceeds to step S301.

  In step S301, the position of the motor 13 is acquired using the Hall IC. Then, the process proceeds to step S302.

  In step S302, excitation is performed so that the motor 13 rotates in reverse in accordance with the acquired position of the motor 13. Then, the process proceeds to step S303.

  In step S303, it is checked whether the value of the reverse operation timer has passed 1 second. If the value of the reverse operation timer has exceeded 1 second, the processing time has exceeded, and thus the process proceeds to step S307 to end the air bleeding process. On the other hand, if the value of the reverse operation timer has not passed 1 second, the process proceeds to step S304.

  In step S304, the position of the motor 13 is acquired again using the Hall IC, and it is checked whether the position has been switched. If the position has not been switched, the process returns to step S303 to wait until the position is switched. On the other hand, if the position has been switched, the process proceeds to step S305.

  In step S305, the excitation count is incremented by “1”. Then, the process proceeds to step S306.

  In step S306, it is checked whether the rotating shaft 16 of the motor 13 has rotated halfway. Specifically, in the 6-pole motor 13, the machine makes one rotation with 18 excitations, so it is checked whether the rotation shaft 16 of the motor 13 is half-rotated by checking whether the excitation count is “9”. The If the excitation count is not “9”, the process returns to step S301 to repeat excitation. On the other hand, if the excitation count is “9”, the process proceeds to step S307.

  In step S307, a motor brake is applied and the motor 13 is stopped. Then return.

  By executing this air venting process, the reverse rotation is made until the rotating shaft 16 of the motor 13 is rotated halfway, so that the secondary piston 34 is always lowered to the bottom dead center position. Since the secondary piston 34 is guided to the lower side, air can be surely removed.

(Summary)
As described above, according to the present embodiment, the secondary cylinder 31 is provided with the air vent hole 31a between the top dead center and the bottom dead center of the secondary piston 34, and the air vent hole 31a. It is possible to execute an air bleeding process in which the secondary piston 34 is slid to a position where the internal space of the secondary cylinder 31 communicates with the outside of the secondary cylinder 31 via the. For this reason, even if the secondary piston 34 stops at a position where air cannot be vented, the air venting process is executed and air can be vented reliably.

  That is, in the present embodiment, the air vent hole 31a is provided at a low position of the secondary cylinder 31 so that the air being compressed does not leak from the air vent hole 31a and the compression efficiency is not lowered. For this reason, the time during which the internal space of the secondary cylinder 31 communicates with the outside of the secondary cylinder 31 during compression can be shortened, and the compression function is not hindered even if the air vent hole 31a is not made extremely small.

  Further, providing the air vent hole 31a at a low position causes a problem in the relationship between the stop position of the air vent hole 31a and the secondary piston 34, but this problem is solved by the air venting process. In this air venting process, the air can be surely vented by performing control to move (or stop) the secondary piston 34 more slowly than in the compression operation.

  Moreover, since it is not necessary to make the air vent hole 31a extremely small, the air can be quickly extracted and the risk that the air vent hole 31a is blocked by a foreign substance can be reduced.

  Furthermore, since the two effects of the pressure drop by lowering the secondary piston 34 and the pressure drop by air bleeding can be obtained, the restart can be performed quickly.

  Further, the control means executes this air venting process by reversing the motor 13. In this way, the motor 13 is not operated in the forward rotation direction where the load is high, but is operated in the reverse rotation direction where the load is low. Even when locked, air can be vented reliably.

  Further, since the control means executes the air bleeding process when the activation of the motor 13 fails, it can perform the air bleeding process only when necessary.

  Further, the control means executes the air bleeding process after waiting for a predetermined time when the motor 13 fails to start. As a result, the temperature can be reduced during the standby time to reduce the pressure, and the residual pressure can be more reliably removed, and the motor 13 can be started successfully.

  In the above-described embodiment, the air venting process is executed only when the motor 13 fails to start. However, the present invention is not limited to this. For example, the air venting process is always executed when the motor 13 is stopped. May be.

  In the above-described embodiment, the air vent hole 31 a is provided in the secondary cylinder 31, but the present invention is not limited to this, and the air vent hole may be provided in the primary cylinder 21.

  In the above-described embodiment, the air venting process is executed by operating the motor 13, but the present invention is not limited to this, and the air venting process may be executed by other means. For example, the air venting process may be executed manually.

DESCRIPTION OF SYMBOLS 11 Crankcase 12 Motor case 13 Motor 14 Rotor 15 Stator 16 Rotating shaft 20 Primary compression mechanism 21 Primary cylinder 22 Primary eccentric plate 23 Primary connecting rod 24 Primary piston 30 Secondary compression mechanism 31 Secondary cylinder 31a Air vent hole 32 Secondary eccentric Plate 33 Secondary connecting rod 34 Secondary piston 40 Lip ring 41 Ring presser 42 Ring spring

Claims (7)

A compression mechanism that compresses air by reciprocating the piston in the cylinder;
A motor for driving the compression mechanism;
Control means for controlling the operation of the motor;
With
The cylinder has an air vent hole between the top dead center and the bottom dead center of the piston,
Wherein Ri executable der Bleed processing for sliding the piston interior space of the cylinder through the air vent hole to a position communicates with the outside of the cylinder,
An air compressor characterized in that, in the air venting process, the piston is slid at a speed slower than that during compression operation . A compression mechanism that compresses air by reciprocating the piston in the cylinder;
A motor for driving the compression mechanism;
Control means for controlling the operation of the motor;
With
The cylinder has an air vent hole between the top dead center and the bottom dead center of the piston,
Wherein Ri executable der Bleed processing for sliding the piston interior space of the cylinder through the air vent hole to a position communicates with the outside of the cylinder,
The said control means reversely rotates the said motor and performs the said air bleeding process , The air compressor characterized by the above-mentioned . A compression mechanism that compresses air by reciprocating the piston in the cylinder;
A motor for driving the compression mechanism;
Control means for controlling the operation of the motor;
With
The cylinder has an air vent hole between the top dead center and the bottom dead center of the piston,
Wherein Ri executable der Bleed processing for sliding the piston interior space of the cylinder through the air vent hole to a position communicates with the outside of the cylinder,
The said control means performs the said air bleeding process, when starting of the said motor fails , The air compressor characterized by the above-mentioned . A compression mechanism that compresses air by reciprocating the piston in the cylinder;
A motor for driving the compression mechanism;
Control means for controlling the operation of the motor;
With
The cylinder has an air vent hole between the top dead center and the bottom dead center of the piston,
Wherein Ri executable der Bleed processing for sliding the piston interior space of the cylinder through the air vent hole to a position communicates with the outside of the cylinder,
The air compressor is characterized in that the control means executes the air bleeding process after waiting for a predetermined time when the motor fails to start . A compression mechanism that compresses air by reciprocating the piston in the cylinder;
A motor for driving the compression mechanism;
Control means for controlling the operation of the motor;
With
The cylinder has an air vent hole between the top dead center and the bottom dead center of the piston,
Wherein Ri executable der Bleed processing for sliding the piston interior space of the cylinder through the air vent hole to a position communicates with the outside of the cylinder,
The said control means waits for a predetermined time after performing the said air bleeding process, Then, the said motor is started , The air compressor characterized by the above-mentioned . 6. The piston according to claim 1, wherein, in the air bleeding process, the piston is stopped at a position where an internal space of the cylinder communicates with the outside of the cylinder through the air bleeding hole. air compressor. And the control means to perform the air bleeding process by operating the motor, an air compressor according to any one of claims 1-6.

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