KR101384226B1 - Electromagnetic air compressor - Google Patents

Abstract

The present invention relates to an electromagnetic air compressor, wherein the air compressor comprises: hollow first and second cylinders (11, 12) arranged in a straight line in the axial direction; First and second pistons 13 and 14 having magnets 15 and 16 having different polarities and installed in a linearly movable manner in contact with the first and second cylinders 11 and 12, respectively; First and second center bodies 21 and 22 which face each other and are hermetically inserted between the first and second cylinders 11 and 12; An electromagnet portion 32 inserted coaxially between the first and second center bodies 21 and 22 and forming a magnetic force between the magnets 15 and 16 when electric power is supplied; First and second sides coupled to the outer ends of the first and second cylinders 11 and 12, respectively, to support the first and second cylinders 11 and 21 and the first and second center bodies 21 and 22 therebetween. Cover 42; the electromagnet unit 32 is connected to an inverter 52 including an AC / DC converter for converting AC power into DC and a controller 53 in turn, and the inverter 52 supplies a voltage. A buck converter for lowering and an inverter for converting DC power back to AC power, the controller 53 is characterized in that the output voltage of the inverter 52 is controlled to vary.

Description

Electromagnetic Air Compressor

The present invention relates to an electromagnetic air compressor for compressing and supplying air by an electromagnetic method, and more particularly, by attracting power due to a difference in polarity between a permanent magnet installed therein and by changing the polarity of the power supply by an inverter. The present invention relates to an electromagnetic air compressor that generates power using repulsive force and compresses and supplies air at high pressure by the generated power.

Generally, a compressor is roughly classified into a refrigerant compressor for compressing a refrigerant and an air compressor for compressing air in the atmosphere.

The air compressor compresses the air in the atmosphere at high pressure and supplies it to a pneumatic actuator such as an air cylinder to operate the actuator. The air compressor is used as a power source for operating an automatic control system, a dental instrument, and the like. As described above, it is divided into various categories according to the classification criteria, and in particular, rotary type and piston type according to the operation type. The rotary type air compressor is operated by the rotation of the rotor without a valve for intake and delivery of air. It is configured to transport air, it is suitable for use when low flow and high pressure lift is required, and its structure is simple and easy to handle. The piston type air compressor sucks and discharges air by reciprocating the piston. Can be pressurized, inlet, compressed and evacuated It generates the air, and is excellent in performance, compared to other relatively air compressor.

However, the conventional rotary type and piston type air compressors, in spite of their advantages, require not only a high power source but also use lubricating oil to improve the airtight performance while preventing friction generated during operation. Since lubricating oil is mixed in the compressed air discharged, there is a problem that it is difficult to use in a process requiring fine and clean compressed air.

The present invention has been made to solve the problems of the conventional rotary type and / or piston type air compressor as described above, and acts between the piston and the center rod by periodically changing the polarity of the center rod by an electromagnetic method. It is an object of the present invention to provide an electromagnetic air compressor that generates and supplies compressed air by repeatedly forming an alternating force and repulsive force.

In order to achieve the above object, the present invention provides an electromagnetic air compressor, wherein the air compressor comprises a hollow first and second cylinders arranged in a straight line in the axial direction; First and second pistons having magnets of different polarities and installed in the first and second cylinders so as to be linearly movable; First and second center bodies which face each other and are hermetically inserted between the first and second cylinders; An electromagnet portion inserted coaxially between the first and second center bodies and forming a magnetic force with the magnet when electric power is supplied; First and second side covers respectively coupled to the outer ends of the first and second cylinders and supporting the first and second cylinders and the first and second center bodies therebetween; And an inverter including an AC / DC converter for converting the voltage into an inverter, and the inverter is composed of a buck converter for dropping a voltage and an inverter for converting DC power back to AC power. By controlling the voltage to vary.

In this case, the first and second side covers are preferably provided with a magnetic damper for mitigating the impact shock of the first and second pistons.

In addition, a position sensor is provided inside the magnet damper, respectively, and the output of the position sensor is configured to be input to the controller, so that the polarization timing and compression amount of the electromagnet portion may be adjusted.

In addition, each of the first and second side covers is provided with an inlet and an outlet for introducing and discharging air into the first and second cylinders, and each of the inlets and outlets is provided with a check valve capable of fluid flow in only one direction. .

In addition, a plurality of through holes are formed at the inner end of the first cylinder and the inner end of the second cylinder, respectively, along the outer circumferential surface of the first and second cylinders so that air inside the first and second cylinders can be discharged. desirable.

The present invention can generate various air pressures from low pressure to high pressure through efficient use of the attraction force and repulsive force formed between the first and second pistons and the first and second center rods, and at the same time, the air compressor can be miniaturized and optimized. As a result, the energy conversion efficiency can be increased as compared with the conventional air compressor.

In addition, since the first and second pistons are operated by the magnetic force generated by the electromagnets, the noise is greatly reduced, and also a lubricant for preventing friction between the first and second pistons and the first and second cylinders needs to be supplied. This eliminates the incorporation of lubricants in the compressed air, thus eliminating the need for a filtering system and improving air cleanliness.

In addition, since the present invention uses an electromagnet as a power source, heat generation is significantly lower than that of a mechanical air compressor, and thus, there is no need to install a separate cooling device in the air compressor.

In addition, the present invention is also provided with a position sensor in each of the magnetic damper, the output of the position sensor is configured to be input to the controller to adjust the polarity conversion timing and the amount of compression of the electromagnet portion, as a result is generated when driving the air compressor Torque ripple can be reduced, resulting in quiet operation and efficient power usage.

1 is an exploded perspective view showing an electromagnetic air compressor according to the present invention;
2 and 3 is an exploded perspective view showing a part of the configuration of the electromagnetic air compressor according to the present invention,
4 is a perspective view showing a coupled state of the electromagnetic air compressor according to the present invention;
5 is a cross-sectional view taken from AA of FIG. 4;
6 is a configuration diagram showing a whole compressed air supply system including an electromagnetic air compressor according to the present invention;
8 is a configuration diagram showing a configuration of an inverter for supplying a variable voltage to the air compressor according to the present invention;
7 (a, b) is a cross-sectional view showing an operating state of the electromagnetic air compressor according to the present invention.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment will be described in more detail the configuration of the present invention.

The present invention is to provide an electromagnetic air compressor for generating and supplying compressed air by periodically changing the polarity of the center rod by the electromagnetic method to be repeatedly formed alternately the attraction force and the repulsive force acting between the piston and the center rod. To this end, the air compressor of the present invention, as shown in Figure 1, the first cylinder 11 and the second cylinder 12 of the hollow; A first piston 13 and a second piston 14 which are internally installed in the first and second cylinders 11 and 12 so as to be movable in a linear manner; A first center body 21 and a second center body 22 which are installed in a gastight manner to face each other between the first and second cylinders 11 and 12; An electromagnet portion 32 which is coaxially and airtightly inserted between the first and second center bodies 21 and 22; And a first side cover 41 and a second side cover 42 that are hermetically installed at outer ends of the first and second cylinders 11 and 12.

The first and second cylinders 11 and 12 are formed in a cylindrical shape using a nonmagnetic material such as aluminum, and have first and second center bodies 21 and 22 therebetween in the axial direction as illustrated in FIG. 5. Arranged in line.

And the inner end of the first cylinder 11 and the inner end of the second cylinder 12, as shown in Figures 1 and 4 so that the air inside the first and second cylinders (11, 12) is discharged A plurality of through holes 11A and 12A are formed along the outer circumferential surfaces of the first and second cylinders 11 and 12, respectively, and these through holes are formed when the first and second pistons 13 and 14, which will be described later, respectively move backward. Air present in the space located at the rear of the air acts as a back pressure with respect to the first and second pistons 13 and 14 to prevent the smooth movement of the first and second pistons 13 and 14. It is to.

Inside the first and the 22 pistons 13 and 14, magnets 15 and 16 formed of permanent magnets having different polarities are embedded, respectively, and pistons are provided on the outside to prevent the magnets 15 and 16 from being separated. Snap rings 17 and 18 are respectively installed.

In addition, piston o-rings 19 and 20 are respectively installed on the outer circumferential surfaces of the first and second pistons 13 and 14 to seal the airtightness between the first and second pistons 13 and 14 and the first and second cylinders 11 and 12. Increase performance

The electromagnet part 32 is composed of a cylindrical core 33 made of a ferromagnetic material and a conductive wire 34 wound around the core 33. As a result, the core 33 is magnetized to act as a magnet.

The electromagnet part 32 is supported between the first and second cylinders 11 and 12 in a built-in form between the first and second center bodies 21 and 22 to be hermetically sandwiched between the first and second cylinders 11 and 12, respectively. , 12), and the attraction force and repulsive force between the magnets 15 and 16 of the first and second pistons 13 and 14 as a current flows through the conductive wire 34 and the core 33 is magnetized. Will form.

As shown in FIG. 6, an inverter 52 is connected to the electromagnet part 32 to supply a variable voltage supplied from the AC power source 51, thereby increasing the magnetic force generated from the electromagnet part 32. Is controlled.

7 is a view showing a specific structure of the inverter used in the present invention, when AC power is first supplied from a commercial power source, the supplied AC power is converted to DC by an AC / DC converter, the converted AC power is a buck The voltage is dropped by a buck converter, and then converted into AC by a full bridge type inverter and then output to AC and then input to the electromagnet portion 32 of the electronic air compressor.

At this time, the controller controls the bucker converter in accordance with the pressure of the air to be generated from the air compressor to change the voltage, and also to change the direction of the AC supplied to the air compressor according to the polarity required for the electromagnet portion 32 to compress the air By outputting the attraction force and the repulsive force by the polarity of the electromagnet portion 32 of the air compressor.

Due to this configuration, the electromagnet portion 32 periodically changes the polarity of the core 33 by the alternating current power supplied to the conductive wire through the inverter 52, so that the magnets 15 of the first and second pistons 13 and 14 are changed. 16) the attraction force and the repulsive force are alternately formed between the first and second pistons 13 and 14, so that the first and second pistons 13 and 14 are formed as shown in FIGS. 8A and 8B, respectively. Compressed air is generated by reciprocating along the inner wall to compress internal air of the first and second cylinders 11 and 12.

That is, the inverter 52 serves to periodically change the polarity of the core 33 of the electromagnet portion 32 as a result and to adjust the magnitude of the voltage input to the core 33 of the electromagnet portion 32. .

Compressed air generated in each of the first and second cylinders 11 and 12 is stored in the air tank 56 through the air separator 54 and the air filter 55 as shown in FIG. Supplied. The actuator operates the machine by performing mechanical work using the supplied compressed air.

In addition, the inverter 52 may vary the frequency of the AC power output by the control of the controller 53 is connected, by controlling the period of change of the polarity of the core 33 by such a configuration high pressure at low pressure It is possible to produce compressed air having various air pressures.

In addition, the electromagnet portion 32 includes a center bush 35 disposed between the conductive wire 34 and the core 33 to insulate the conductive wire 34 from the core 33.

Meanwhile, as shown in FIG. 5, the first and second pistons 13 and 14 are integrally connected by a center rod 38 penetrating the core 33 of the electromagnet portion 32 in the axial direction. do.

The center rod 38 is connected to the first and second pistons 13 and 14 by integrally connecting both ends of the first and second pistons 13 and 14 by press-fitting the upper ends of the first and second pistons 13 and 14. 14) supports stable linear movement.

In addition, the center rod 38 is the first and second cylinders 11 and 12 by a core O-ring 36 installed on the inner wall surface of the core 33 when the center rod 38 linearly moves together with the first and second pistons 13 and 14. Will be moved while maintaining confidentiality.

The first and second center bodies 21 and 22 have one end surface formed to be stepped into each cylinder and have a structure in which a central portion thereof is axially drilled.

The first and second center bodies 21 and 22 are formed in a shape in which the stepped portion is hermetically inserted into one end of each of the first and second cylinders 11 and 12 and the other end faces face each other. The opposite ends of the first and second cylinders 11 and 12 are sealed together with the electromagnet portion 32 and the center rod 38 penetrating through the electromagnet portion 32.

In addition, between the first and second center bodies 21 and 22 and the first and second cylinders 11 and 12 and between the first and second center bodies 21 and 22 and the core 33 of the electromagnet part 32. The center body o-ring 31 and the electromagnet portion O-ring 37 are respectively mounted to increase the airtight performance.

Meanwhile, the other end of each of the first and second cylinders 11 and 12, that is, the outer end of the first and second cylinders 11 and 12 arranged in a line, is sealed by the first and second side covers 41 and 42. do.

The first and second side covers 41 and 42 are stepped into one end of each of the first and second cylinders 11 and 12 in an airtight manner, and are coupled by fastening members 39 such as long bolts. do.

At this time, the fastening member 39 penetrates through the first and second center bodies 21 and 22 from the outside of the first and second cylinders 11 and 12, as shown in FIG. 4, and the first and second side covers 41 and 42. To combine and support and secure the first and second center bodies 21 and 22 assembled between the first and second cylinders 11 and 12.

In addition, the first and second side covers 41 and 42 are provided with damper members for alleviating impact when the first and second pistons 13 and 14 collide with each other.

As the damper member, rubber dampers 43 and 44 made of urethane material and magnet dampers 45 and 46 made of permanent magnets are used, and the magnetic dampers 45 and 46 are formed of the first and second pistons 13 and 14. It has the same polarity as the magnets 15 and 16.

The magnetic dampers 45 and 46 are inserted into one end surfaces of the first and second side covers 41 and 42, and the magnetic dampers 45 and 46 are separated from the first and second side covers 41 and 42. Cover snap rings 47 and 48 are assembled respectively for prevention.

And inside the magnet dampers 45 and 46, a position sensor (not shown) such as a hall sensor is installed to check the positions of the magnets 15 and 16 that move periodically or repeatedly, respectively. The output is configured to be input to the controller 53, whereby the controller 53 controls the inverter 52 based on the input signal from the position sensor to adjust the polarity conversion timing and compression amount of the electromagnet portion 32, etc. As a result, torque ripple generated when the air compressor is driven can be reduced, resulting in quiet operation and efficient power usage.

Each of the first and second side covers 41 and 42 has inlets 49A and 50A and outlets 49B and 50B for introducing and discharging air into the first and second cylinders 11 and 12 as shown in FIG. 5. ) Is formed.

The inlets 49A and 50A and the outlets 49B and 50B serve as air passages connecting the inside and the outside of the first and second cylinders 11 and 12, respectively, and each of the inlets 49A and 50A and the outlets ( 49B and 50B are provided with check valves 40A ', 49B', 50A 'and 50B', which allow fluid flow in only one direction.

By this configuration, only the air supplied into the first and second cylinders 11 and 12 flows into the inlets 49A and 50A, and only the compressed air generated inside the cylinders 11 and 12 into the outlets 49B and 50B. In addition, air discharge to the inlets 49A and 50A and air inflow to the outlets 49B and 50B are prevented.

As described above, the present invention eliminates the use of lubricating oil by operating the air compressor by an electromagnetic method, and as a result, clean compressed air can be produced and supplied.

10 electromagnetic electromagnetic compressor 11 first cylinder
11A: through hole 12: second cylinder
12A: through hole 13: first piston
14: 2nd piston 15, 16: magnet
17, 18: piston snap ring 19, 20: piston o-ring
21: 1st center body 22: 2nd center body
31: center body O-ring 32: electromagnet
33 core 34 conductor
35: center bush 36: core O-ring
37: Electromagnet O-ring 38: Center Rod
39: fastening member 41: first side cover
42: second side cover 43, 44: rubber damper
45, 46: magnetic dampers 47, 48: cover snap ring
49A, 50A: Inlet 48B, 50B: Outlet
49A ', 49B', 50A ', 50B': Check valve 51: DC power
52: inverter 53: controller
54: air separator 55: air filter
56: air tank

Claims (7)

In the electromagnetic air compressor that changes the polarity of the electromagnet by the inverter to generate power by using the attraction force and the repulsive force generated by the difference of the polarity with the permanent magnet, to compress and supply the air,
The air compressor includes a hollow first cylinder 11 and a second cylinder 12 arranged in a straight line in the axial direction;
A first piston (13) and a second piston (14) having magnets (15, 16) of different polarities and installed in a linearly movable manner in contact with the cylinders (11, 12), respectively;
A first center body (21) and a second center body (22) which are hermetically inserted in contact with each other between the first and second cylinders (11, 12);
An electromagnet portion 32 inserted coaxially between the first and second center bodies 21 and 22 and forming a magnetic force between the magnets 15 and 16 when electric power is supplied;
It is coupled to the outer end of the first and second cylinder (11, 12), respectively, is connected by a plurality of fastening members 39 for supporting the cylinder (11, 21) and the center body (21, 22) 1 side cover 41 and the second side cover 42;
An inverter 52 including an AC / DC converter for converting AC power to DC is connected to the electromagnet part 32 and a controller 53, and the inverter 52 includes a buck converter for dropping a voltage, and a DC. An inverter converts power back to AC power, and the controller 53 controls the output voltage of the inverter 52 to vary.
Each of the side covers 41 and 42 is provided with inlets 49A and 50A and outlets 49B and 50B for introducing and discharging air into the first and second cylinders 11 and 12, respectively. Electromagnetic air compressor, characterized in that the check valve (40A ', 49B', 50A ', 50B') that is capable of fluid flow in only one direction is provided in each of the 50A) and the outlet (49B, 50B).
The method according to claim 1,
Electromagnetic air compressor, characterized in that the first and second side cover (41, 42) is provided with a magnetic damper (45, 46) for mitigating the impact impact of the first and second piston (13, 14).
The method according to claim 2,
Position sensors are installed inside the magnetic dampers 45 and 46, respectively, and outputs of the position sensors are configured to be input to the controller 53 to control the polarity conversion timing and the amount of compression of the electromagnet part 32. Electromagnetic air compressor characterized by.
The method according to claim 1,
The electromagnet part 32 is an electromagnetic air compressor, characterized in that consisting of a cylindrical core (33) made of a ferromagnetic material and the conductive wire (34) wound around the core (33).
The method according to claim 1,
The first and second pistons (13,14) is characterized in that the electromagnetic air compressor is configured to be integrally connected by a center rod (38) penetrating the electromagnet portion (32) in the axial direction.
delete The method according to claim 1,
The first and second cylinders 11 and 11 allow the air inside the first and second cylinders 11 and 12 to be discharged to the inner end of the first cylinder 11 and the inner end of the second cylinder 12, respectively. , 12) A plurality of through-holes (11A, 12A) is formed along the outer circumferential surface of the electromagnetic air compressor.

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