JPH0515590Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to an air compressor, and in particular, it efficiently converts electrical energy into mechanical energy to reciprocate an air compression piston. The present invention relates to an air compressor suitable for

(Prior Art) An example of a conventional air compressor is shown in FIG. Fourth
The figure is a sectional view of essential parts of the device.

In the figure, in the center of the housing 23,
An annular internal magnetic pole 27 and an external magnetic pole 28 are fixed. In the gap between the internal magnetic pole 27 and the external magnetic pole 28, the movable coil 2 wound around the coil holding member 25 is disposed.
6 is arranged, and the coil holding member 25 is connected to the internal magnetic pole 2.
It is fixed to a vibrating shaft 24 inserted through a hole in the center of 7. Both ends of the vibration shaft 24 are supported by a diaphragm 29 (one not shown) fixed to the housing 23. The diaphragm 29 forms one wall of the compression chamber 30, and a suction valve 31 and a discharge valve 32 are provided on the wall of the compression chamber 30 facing the diaphragm 29.

In the air compressor having the above configuration, when an AC power source is connected to the movable coil 26 and energized, an electromagnetic force acts between the magnetic field formed by the magnetic poles 27 and 28 and the movable coil 26, a coil holding member 25 around which a moving coil 26 is wound;
And the vibration shaft 24 fixing the coil holding member 25 vibrates.

As the vibration shaft 24 vibrates, the diaphragm 29 connected to the shaft 24 also vibrates. When the diaphragm 29 vibrates, air is sucked into the compression chamber 30 from the suction valve 31 and the compressed air is discharged from the discharge valve 32.

A device similar to the above air compressor is disclosed in, for example, Japanese Utility Model Application Publication No. 15991/1983.

(Problems to be solved by the invention) The above-mentioned conventional technology had the following problems.

In the conventional device described above, since the internal magnetic pole 27 and the external magnetic pole 28 are arranged concentrically, the magnetic pole 27 and the external magnetic pole 28 are arranged concentrically.
There is a difference in the surface area of the mutually opposing surfaces of Nos. 7 and 28. In other words, the surface area of the outer magnetic pole 28 is larger than the surface area of the inner magnetic pole 27.

Due to this difference in surface area between the internal magnetic pole 27 and the external magnetic pole 28, a difference occurs between the magnetic flux density of the internal magnetic pole 27 and the magnetic flux density of the external magnetic pole 28, and the magnetic flux passing through the moving coil 26 is It will be limited by the magnetic flux saturation of 27.

Therefore, in an attempt to downsize the compressor,
When the inner magnetic pole 27 and the outer magnetic pole 28 are made smaller, the density of the magnetic flux traversed by the current flowing through the moving coil is reduced, and the output of the compressor is extremely reduced.

As a result, compared to the effect obtained by downsizing,
There was a problem in that the loss due to the decrease in output was greater.

The present invention solves the above-mentioned problems, allows the magnetic force of the fixed magnet device to efficiently act on the moving coil disposed between the magnetic poles of the fixed magnet device, and generates a large electromagnetic force for energizing the moving coil. so that you can get
It is an object of the present invention to provide an air compressor in which the magnetic pole and moving coil are arranged.

(Means and effects for solving the problem) In order to solve the above-mentioned problems, the present invention provides a magnet device in which magnetic pole faces having the same size face each other with a predetermined parallel interval; A coil is disposed between the magnetic poles of the magnet device and supported so as to be able to reciprocate in a direction parallel to the surface of the magnetic poles, and the coil is connected to a vibrating member for compressing and discharging air. There is a first characteristic.

Further, in the present invention, two sets of the magnet devices are arranged adjacent to each other, and the magnetic poles of the two sets of magnet devices are arranged so that adjacent magnetic poles have opposite polarities,
A second part of the coil is arranged between the magnetic poles of one of the two sets of magnet apparatuses, and another part substantially parallel to the part is arranged between the magnetic poles of the other set of magnet apparatuses. It has the characteristics of

In the present invention having the above configuration, the opposing magnetic pole surfaces have the same area and are opposed to each other with a predetermined parallel interval, so that a magnetic field with a uniform distribution of magnetic flux density is formed between the magnetic poles.

Therefore, the density of magnetic flux across the coil is not limited by the dimensions of one magnetic pole face,
It is possible to efficiently obtain an electromagnetic force for energizing the moving coil that corresponds to the dimensions of the magnetic pole surface.

Further, according to the second feature, the current supplied to the coil supported so as to be able to freely reciprocate can be used as electromagnetic force for reciprocating the coil without waste.

(Example) The present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of an air compressor according to the present invention. FIG. 1 is a longitudinal sectional view of the embodiment, and FIG. 2 is a sectional view taken along line A-A' in FIG.

1 and 2, two electromagnet devices (hereinafter referred to as stators) 2a, which are composed of C-shaped layered cores 3a, 3b and coils 4a, 4b,
2b are fixed to the casing 5 by means of a bracket 10 and are arranged adjacent to each other in the central part of the casing 5.

The iron cores 3a and 3b are provided with magnetic poles 34 and 35 (only the iron core 3a side is shown) facing each other with a predetermined parallel interval, and the opposing magnetic pole surfaces have the same area.

The coils 4a and 4b are arranged in opposite directions so that the polarities of the magnetic poles formed at the ends of the iron cores 3a and 3b are opposite to each other by the current flowing through the coils 4a and 4b. rolled in the direction.

The movable element 1, which includes a bobbin 1a and a coil 1b wound around the bobbin 1a, is suspended from the casing 5 by a pair of plate-shaped return springs 7a, 7b via support shafts 6a, 6b, and fixed. It is arranged between each magnetic pole of the children 2a and 2b.

Note that one of the return springs 7a may be omitted.

2, the return springs 7a, 7b have a frame-like overall shape, and the movable member 1 is fixed near the center of the frame, so that the distance from the fixed portion of the springs 7a, 7b to the casing 5 to the fixed point of the movable member 1 can be substantially increased. Therefore, the deviation between the center of the movable member 1 and the center of the cylinder 12 that occurs when the movable member 1 reciprocates can be absorbed, and the piston 8 can reciprocate smoothly within the cylinder 12.

The coil 1b is wound in a rectangular shape along the shape of the bobbin 1a, and one of the two opposing sides of the rectangle is between the magnetic poles of one of the stators 2a and 2b. mover 1 and stators 2a and 2 such that the other side is located between the magnetic poles of the other stator of stators 2a and 2b.
b is placed.

Since the coil 1b is wound around the bobbin 1a,
The insulation between the iron cores 3a, 3b and the coil 1b is good. Therefore, even if the parallel spacing between the cores 3a and 3b is small, slightly exceeding the thickness of the bobbin 1a, the distance between the coil 1b and the cores 3a and 3 is small.
Safety can be ensured since there is no risk of contact with b.

A piston 8 (vibration member) is connected to the support shaft 6a, and the piston 8 is slidably housed in a cylinder 12 surrounded by a cylindrical partition wall 9, a casing 5, and a lid 11. ing.

Further, a compression chamber 13 is formed at one end of the cylinder 12 and is closed by a piston 8, a casing 5, and a cylindrical partition 9.
A buffer chamber 14 is formed around the outer periphery of the compressed air to absorb pulsation of the compressed air and obtain a smooth air flow.

The piston 8 is provided with an air intake port 15 and an intake valve 16 for opening and closing the air intake port 15.
The cylindrical partition wall 9 is provided with a compressed air discharge port 17 and a discharge valve 18 for opening and closing the discharge port 17.

The compressed air in the buffer chamber 14 is transferred to the casing 5
It is taken out to the outside from a discharge nozzle 19 formed in .

In the air compressor having the above configuration, the coil 4a,
When a current is passed through the iron cores 4b, the iron cores 3a and 3b are magnetized, and polarities N and S appear at the end magnetic poles of the iron cores 3a and 3b, respectively. In this case, coils 4a, 4b
are wound in opposite directions, so the iron core 3
Opposite polarities appear in mutually adjacent magnetic poles a and 3b.

In this state, when a half-wave rectified current or a pulse current is passed through the coil 1b of the mover 1, the current crosses the magnetic flux between the magnetic poles of the stators 2a and 2b, and as a result, the coil 1b becomes electromagnetic. Under the action of the force, the mover 1 moves in a direction determined depending on the direction of the current flowing through the coil 1b.

For example, if the mutually opposing magnetic poles of the stator 2a have polarities N and S as shown in FIG.
When a current i is passed through the coil 1b in the direction of the arrow 20, the movable element 1 is urged in the direction indicated by the symbol d in FIG. 2 and the direction indicated by the arrow 21 in FIG.

On the other hand, the mutually opposing magnetic poles of the stator 2b have polarities (not shown) opposite to the polarity of the magnetic poles of the stator 2a.
In the part located between the magnetic poles of the stator 2b,
Since the current i flows in the opposite direction (in the direction of arrow 22) to the part of the coil 1b located between the magnetic poles of the stator 2a, the mover 1 also moves in the direction of the arrow 21.
receives a force in the direction shown by .

Due to the action of such electromagnetic force, the movable element 1 overcomes the repulsive force of the plate-shaped springs 7a and 7b and is displaced in the direction of the arrow 21. During the intermittent portions of the half-wave rectified current or pulsed current flowing through the coil 1b, no electromagnetic force acts between the movable element 1 and the stators 2a and 2b.
It is returned to its original position by the repulsive forces of a and 7b.

In this way, by passing a half-wave rectified current or a pulsed current through the coil 1b, the movable element 1 is reciprocated, and the piston 8 connected to the movable element 1 is accordingly reciprocated within the cylinder 12. be done.

By reciprocating the piston 8, air is sucked in and compressed in the following order, and is taken out as compressed air.

First, when the piston 8 moves in the direction of the arrow 21,
The suction valve 16 opens and air is sucked into the compression chamber 13 through the suction port 15. The air sucked into the compression chamber 13 is compressed by the piston 16 moving in the opposite direction to the arrow 21, causing the discharge valve 18 to open, and the compressed air is sent to the buffer chamber 14 through the discharge port 17. It is discharged from the discharge nozzle 19 to the outside.

As explained above, in this embodiment, the stator 2
Since a magnetic field with a uniform magnetic flux density is formed between the magnetic poles of stators 2a and 2b facing each other, a magnetic field of uniform magnetic flux density is formed between the magnetic poles of stators 2a and 2b. Electromagnetic force can be obtained efficiently.

As a result, when the iron cores 3a, 3b are downsized, the output decreases proportionally, but the current flowing through the coils 4a, 4b is transferred to the stator 2.
The efficiency of converting the strength of the magnetic field between the magnetic poles a and 2b does not decrease.

Furthermore, in this embodiment, since the iron core of the fixed magnet device is composed of a layered iron core, the material can be easily manufactured by punching. Therefore, it is easier to manufacture than the conventional cylindrical core (see FIG. 4), which requires cutting or cutting the cast product.

In this embodiment, the winding directions of the coils 4a and 4b wound around the iron cores 3a and 3b are reversed so that the polarities of adjacent magnetic poles are opposite, but the winding directions of the coils 4a and 4b are the same. Then, current may be passed through the coils 4a and 4b in opposite directions, so that the polarities of adjacent magnetic poles are reversed.

Note that in this embodiment, two stators are provided to sandwich the movable element 1 at two locations, but a configuration in which only one stator is provided and only one location of the movable element 1 is sandwiched may also be used. good.

In addition, in this embodiment, the direction in which the current in the coil 1b cuts the magnetic flux between the magnetic poles of the stator 2a, and the direction in which the current in the coil 1b cuts the magnetic flux between the magnetic poles of the stator 2b
The coil 1b and each magnetic pole are arranged so that the direction in which the magnetic flux between the magnetic poles is cut is opposite to the direction in which the magnetic flux between the magnetic poles is cut. The coils may be wound in a tassel pattern so that the direction of the current in the coil 1b to be cut is the same. Similarly, set the stator to 1
A movable element in which coils are wound in a folded manner may be arranged between the magnetic poles of the stator. FIG. 3 shows the arrangement of the coils and stator when there is one stator and the coils are wound in a sash.

As shown in FIG. 3, a portion 3 of the coil 1c wound in a folded manner is located between the magnetic poles of the stator 2c.
In 3, the direction of the current is the same, and as a result,
Among the coils 1c wound in a folded manner, the stator 2c
The portion 33 located between the magnetic poles is subjected to an electromagnetic force such that it is biased in the same direction.

Note that a current may be passed continuously through the coil of the mover, and a half-wave rectified current or a pulse current may be passed through the coil of the stator.

Now, in this embodiment, the stators 2a and 2b are constructed by electromagnetic devices, but the same effects as in this embodiment can be obtained even if the stators are constructed by permanent magnets and the mover is sandwiched between the permanent magnets. can get.

Furthermore, when the stator is configured with an electromagnetic device, by changing the current flowing through one of the stator coil and the mover coil to alternating current, and when the stator is made of a permanent magnet, The return springs 7a and 7b can be omitted by changing the current flowing through the coil of the movable element to alternating current. However, if the return springs 7a and 7b are omitted, the movable element must be slidably supported by a sliding bearing or the like.

In this embodiment, a compressor is shown in which a moving coil is connected to a piston and air is compressed by the reciprocating motion of the piston, but the moving coil is connected to a diaphragm and the diaphragm is vibrated to compress air. The present invention can also be applied to other types of compressors. In this case, the diaphragm acts as a return spring for the mover, but this type of compressor can also be used as a suction pump by connecting the intake side to an intake source.

(Effects of the invention) As is clear from the above explanation, in this invention,
The following effects can be obtained.

(1) Since the mutually opposing magnetic pole surfaces of the stator have the same area and are arranged in parallel with a predetermined gap, the magnetic flux between the magnetic poles is uniformly distributed. Therefore, the efficiency does not change due to enlargement or miniaturization of the magnet device, and it is possible to flexibly respond to changes in the design of the magnet device depending on the purpose of use.

(2) Two approximately parallel portions of the annularly wound coil were positioned between the magnetic poles of the fixed magnet device so that the current flowing through the coil of the mover cuts as much magnetic flux as possible. As a result, the current flowing through the coil can be converted into electromagnetic force that energizes the coil without waste.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention viewed from the side, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, and Fig. 3 is a diagram showing another example of how to wind the moving coil. FIG. 4 is a sectional view showing the main parts of a conventional air compressor. 1...Mover, 1a...Bobbin, 1b...Coil, 2a, 2b...Stator, 3a, 3b...Iron core, 4a, 4b...Coil, 5...Casing,
6a, 6b... Support shaft, 7a, 7b... Plate return spring, 8... Piston.

Claims (1)

[Claims for Utility Model Registration] (1) In an air compressor configured to suck air into a compression chamber and discharge air from the compression chamber by vibrating a vibrating member, A fixed magnet device having the same size, and the opposing magnetic pole surfaces of the N-pole and S-pole magnetic poles facing each other with an interval are disposed between the magnetic poles of the magnet device, An air compressor comprising: a movable coil supported so as to be able to reciprocate in a direction parallel to an opposing surface, the movable coil being connected to the vibrating member. (2) the magnet device is composed of two adjacent sets of magnet devices, and the opposing magnetic poles of the two adjacent sets of magnet devices are arranged so that the mutually adjacent magnetic poles have opposite polarities; A portion of the moving coil is arranged between the magnetic poles of one set of the two sets of magnetic poles, and another portion substantially parallel to the portion is arranged between the magnetic poles of another set of magnet devices. The air compressor according to claim 1.