JPH081420U - Portable air compressor - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: It is possible to maintain handheld transportability, to favorably suppress vibration during operation, and to suppress displacement of the device itself without generating large vibration during start-up, restart or stop. Provide a portable air compressor. A compressor is provided with a push solenoid (18) for opening and closing a suction valve (16), and the push solenoid (18) is controlled before energization of a motor (3) to open the suction valve (16) for a certain period of time. Circuit 20 is provided. Before the motor 3 stops, the suction valve opens, and the inertial force of the motor 3 is reduced without being affected by the compression reaction force of the piston. Therefore, it is possible to prevent the motor 3 from oscillating and rotating and generate a large vibration. In addition, the apparatus can be prevented from moving from the original installation position by not generating a large vibration.
Since the installation of the device is performed via the anti-vibration rubber in a state where the compressor body and the air tank are arranged in parallel to the floor, vibration during operation can be reliably suppressed.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a portable air compressor.

[0002]

[Prior art]

 Generally, in an air compressor, a piston provided in the compressor main body is reciprocated by a motor, and this reciprocation causes air to be sucked in through a suction valve provided in the compressor main body to compress the compressed air. I am trying to store it in an air tank. Of these air compressors, the lightweight and portable ones are carried according to the construction work, and are installed at the construction site, for example, and used as drive sources for nailing machines and coating machines for interior and exterior construction. ing. As an example of such a portable air compressor, a reciprocating compressor main body that is driven by a motor and sucks air through an intake valve to compress the air, and the compressor main body are integrated. And a compressed air from the compressor main body is stored, and a vibration-proof rubber is provided on the compressor main body and the air tank, and is installed via the vibration-proof rubber. There is an air compressor. In this portable air compressor, the vibration generated by the reciprocating motion of the compressor body is absorbed by the anti-vibration rubber provided in the compressor body and the air tank to suppress the vibration during operation.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned portable air compressor, when the motor is started, restarted, or stopped, a fluctuating load is generated in the compressor body via the piston, and this force is generated in the compressor body and There is a problem in that the anti-vibration rubber provided in the air tank is deformed and the device is displaced against the load of the portable and lightweight device. In particular, when the motor is stopped, the energy supply to the drive source is stopped and the vibration gradually attenuates due to inertia.However, the drive source receives the pressure reaction force of the air compressed by the compression body, and the drive source is momentary. When the motor is stopped, the motor that had been rotating up to that moment is momentarily stopped, and the moment load in the rotating direction, the momentary stop of the inertial force, and the compression reaction force cause vibrational force to act on the entire device. , The device itself moves much more than when the motor is started or restarted. The microfilm of Japanese Utility Model Application No. 48-6459 (Japanese Utility Model Application Laid-Open No. 49-109209) shows a portable electric inflator in which a motor, a cylinder and an air tank are fixed with bolts. However, since a vibration isolation member is not provided in this inflator, the vibration generated in the cylinder during operation is not absorbed and may cause vibration of the device itself. In addition, if this air inflator is used intermittently for a long time, the device will be displaced by the fluctuating load generated on the cylinder via the piston when the motor is started, restarted or stopped. There is a risk that The present invention has been made in view of the above problems, and it is possible to maintain handheld transportability, to effectively suppress vibration during operation, and to generate large vibration during start-up, restart or stop. It is an object of the present invention to provide a portable air compressor that can suppress the displacement of the device itself.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a reciprocating compressor main body that is driven by a motor and sucks air through an intake valve to compress the air, and the compressor main body is integrated with the reciprocating compressor main body. A portable air compressor that has an air tank for storing compressed air from the compressor body, and installs the compressor body and the air tank in parallel with the floor via a vibration isolator. In the compressor, an actuator that opens and closes the suction valve is installed in the compressor body, the actuator is controlled before the motor is de-energized to open the suction valve for a certain period of time, and the actuator is controlled after the motor is de-energized. Then, a control circuit for closing the intake valve is provided. With the above structure, the intake valve opens before the motor is de-energized in the compression operation state, and the inertial force of the motor gradually decreases without being affected by the compression reaction force of the piston, and finally stops. Therefore, the motor does not generate large vibration.

[0005]

DETAILED DESCRIPTION OF THE INVENTION A portable air compressor according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, the configuration of the portable air compressor according to the present embodiment will be described with reference to FIG. 2. Reference numeral 1 is a case in which a vibration-proof rubber 2 is attached to a lower side (installation side). , A motor 3, a compressor body 4 driven by the motor 3 to perform air compression, an air tank 5 for storing compressed air, an air pressure of the air tank 5 is detected, and a detected pressure is a predetermined value or more. A pressure switch 6 (shown in FIG. 1) which is in an off state and maintains an on state when the value is less than a predetermined value is housed, and a start switch 7 (for turning on / off the connection with a power source is provided on the outside of the case 1. 1) is provided. The air compressor is made small and lightweight so that it can be easily carried by holding the handle 1a of the case 1.

Next, a main part of this embodiment will be described with reference to FIG. The compressor body 4 is provided with a cylinder 9 slidably accommodating a piston 8 driven by a motor 3. A valve mounting plate 12 having a suction hole 10 and a discharge hole 11 is attached to the cylinder 9 with the suction hole 10 and the discharge hole 11 communicating with each other in the cylinder 9. A cylinder head 15 is formed in the valve mounting plate 12 to form an intake chamber 13 that communicates with the atmosphere and a discharge chamber 14 that communicates with the air tank 5. The cylinder head 15 connects the intake chamber 13 and the discharge chamber 14 to the suction hole 10 and the discharge hole, respectively. It is mounted so as to communicate with the inside of the cylinder 9 via 11.

The valve mounting plate 12 is provided with a suction valve 16 which is located in the cylinder 9 so that the suction hole 10 can be opened and closed, and the discharge valve 14 which is located in the discharge chamber 14 so that the discharge hole 11 can be opened and closed. A valve 17 is provided.

A push solenoid 18, which is an actuator, is provided in the suction chamber 13 of the cylinder head 15, and when the push solenoid 18 is turned on, a rod 19 of the push solenoid 18 protrudes to press the suction valve 16 and forcibly open it. A control circuit 20 connected to the start switch 7, the pressure switch 6 and the motor 3 is connected to the push solenoid 18, and the push solenoid 18 and the motor 3 are operated as follows depending on the on / off state of the start switch 7 and the pressure switch 6. It is supposed to be controlled. That is, as shown in FIG. 3, when the start switch 7 is turned on, the push solenoid 18 is turned on for a time t ₁ , and the motor 3 is energized (turned on) after a time t ₂ from the turning on of the push solenoid 18 to open / close the pressure. When the switch 6 outputs an off signal, the push solenoid 18 is turned on, and after a lapse of time t ₂ , the energization of the motor 3 is stopped (turned off). Thereafter, when the pressure switch 6 outputs an on signal, the push solenoid 18 is turned on. 18 is turned on and the motor 3 is energized after time t ₂ . Further, when the start switch 7 is turned off, the push solenoid 18 is turned on, and the power supply to the motor 3 is stopped after the time t ₂ .

The operation of the portable air compressor configured as above will be described. First, when the start switch 7 is turned on, the push solenoid 18 is turned on, whereby the intake valve 16 is opened and the atmosphere and the inside of the cylinder 9 are communicated with each other to be in an unload state, and when the time t _{2 has} elapsed, the motor 3 is energized. Then, rotate it for unloading operation. At this time, since the interior of the cylinder 9 communicates with the atmosphere, a load due to the compression reaction force of the piston 8 is not applied, so that large vibration does not occur in the motor 3. Moreover, since no large vibration is generated, the device itself does not move.

When a time t ₁ has elapsed since the push solenoid 18 was turned on, the push solenoid 18 is turned off to perform a compression operation, and compressed air is stored in the air tank 5. When the air pressure in the air tank 5 becomes equal to or higher than a predetermined value, the pressure switch 6 is turned off, which causes the control circuit 20 to turn on the push solenoid 18 to an unload state, and energize the motor 3 after a lapse of time t _2. Stop. At this time, the inside of the cylinder 9 communicates with the atmosphere, so that the load due to the compression reaction force of the piston 8 disappears, and the inertial force of the motor 3 gradually decreases due to the friction between the piston 8 and the cylinder 9 and the motor is stopped. No big vibration is generated. Moreover, since no large vibration is generated, the device itself does not move.

After a lapse of time t ₁ from turning on the push solenoid 18, the rod 19 of the push solenoid 18 is returned and the suction valve 16 is returned to its original state. In this state, the air in the air tank 5 is used to reduce the air pressure, and when the value reaches a predetermined value, the pressure switch 6 is turned on, which causes the control circuit 20 to turn on the push solenoid 18, and In the unloading state, the motor 3 is energized and rotated to perform unloading operation in the same manner as the above-described startup. At this time as well, in the same manner as described above, since the load due to the compression reaction force of the piston 8 is not applied, the motor 3 does not generate a large vibration, and the device itself does not move.

Further, when the start switch 7 is turned off, the control circuit 20 turns on the push solenoid 18 to bring it into an unload state, and thereafter, the push solenoid 18 is turned on in the same manner as the above-mentioned operation when the pressure switch 6 is turned off. power supply to the motor 3 is stopped after the time t ₂ elapses after. Also at this time, the inertial force of the motor 3 is gradually reduced by the frictional force between the piston 8 and the cylinder 9, and the motor 3 is stopped at last, so that large vibration is not generated. Moreover, since no large vibration is generated, the device itself does not move. In the above-described embodiment, the case where the intake valve 16 is opened at time t ₂ at the time of starting and restarting the motor has been described as an example. However, the vibration at the time of stopping the motor is higher than that at the time of starting and restarting the motor. This process may be omitted in consideration of the extremely large movement involved.

[0014]

[Effect of device]

 As described above, according to the present invention, when the motor is stopped, the suction valve is opened before the motor is stopped, and the inertial force of the motor is reduced without being affected by the compression reaction force of the piston. It is possible to suppress the occurrence of large vibrations and to prevent the device from moving from the initial installation position by not generating large vibrations. In addition, the equipment is installed via the anti-vibration member with the compressor body and the air tank aligned in parallel to the floor, so the vibration of the compressor body that occurs during operation of the compressor body is ensured. Can be suppressed to. Furthermore, since it is portable, it can be held and carried easily.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a main part of a portable air compressor according to an embodiment of the present invention.

FIG. 2 is a front view showing the air compressor.

FIG. 3 is a time chart showing the control contents of the control circuit of the air compressor.

[Explanation of symbols]

 3 Motor 4 Compressor body 16 Intake valve 18 Push solenoid 20 Control circuit

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area F04B 49/02 331B

Claims (1)

[Scope of utility model registration request] 1. A reciprocating compressor main body that is driven by a motor to suck in air through an intake valve to compress the air, and a compressor main body that is integrated with the compressor main body. A portable air compressor having an air tank for storing compressed air from the compressor body and the air tank, wherein the compressor body and the air tank are arranged in parallel with the floor via a vibration isolator. An actuator that opens and closes the intake valve is installed in the section, the actuator is controlled before the energization of the motor is stopped to open the intake valve for a certain period of time, and after the energization of the motor is stopped, the actuator is controlled to close the intake valve. A portable air compressor, characterized in that a control circuit is provided.