JPH11187638A - Iron core movable type linear oscillator and linear compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a highly efficient oscillator with small coil inductance by fitting at least one set of permanent magnets with the one that has the same polarizing direction as the magnetic flux direction of the coil, and the one that has the opposite polarizing direction facing the air-gap in the magnetic flux magnetic circuit of a stator iron core coil taken as one set. SOLUTION: Permanent magnets 3a, 3b are polarized respectively in the +x or *direction of a coordinate axis. The permanent magnets 3a, 3b are constituted of permanent magnets formed integrally or by disposing two or more segment magnets with a different polarizing direction. The polarizing direction of the permanent magnets 3a, 3b at the upper and lower parts of a coil 1 is the same as the generated field direction of the coil 1, therefore, the permanent magnets 3a, 3b at the upper and lower parts of the coil 1 are magnetized, and the polarizing direction of the permanent magnets 3a, 3b at the upper and lower parts of the coil 1 is different from the generated field direction of the coil 1, so that the permanent magnets 3a, 3b at the upper and lower parts of the coil 1 are demagnetized. It is thus possible to move a movable iron core 12 to a position, where the magnetic circuit of a composite magnetic field is formed, and generate thrust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable core type linear vibrator in which a movable core reciprocates by a coil and a permanent magnet. Further, the linear oscillator according to the present invention has a linear oscillator.
The present invention relates to a linear compressor that compresses a working fluid by changing a volume between cylinders.

[0002]

2. Description of the Related Art 2. Description of the Related Art Conventionally, a compressor that reciprocates using a linear vibrator to generate a pressure wave in a working fluid in a cylinder is known as a linear compressor.
FIG. 18 is a configuration diagram showing a compressor using a conventional linear vibrator disclosed in US Pat. No. 5,525,845. In the figure, 1 is a coil for passing an alternating current, 2 is a fixed iron core, 3 is a permanent magnet, 4 is a gap formed between the coil 1 and the permanent magnet 3, 5 is a support member for supporting the permanent magnet 3, 6 Is a back yoke, 7 is a holding member for holding the back yoke 6, 8 is a compliance mechanism for preventing the axial center from shifting, 9 is a piston, 10 is a cylinder, 1
Numeral 1 denotes a resonance spring, which resonates by setting the resonance frequency determined by the weight of the movable portion and the resonance spring 11 to the vibrator frequency.

Next, the operation will be described. When an alternating current is applied to the coil 1, the electromagnetic force acting on the permanent magnet 3 is transmitted to the piston 9 via the support member 5, and performs relative reciprocating motion with the cylinder 10 to change the volume and operate as a compressor. .

Conventional example 2. As a vibrator in which both the permanent magnet and the coil are on the fixed iron core and only the iron core moves, a linear drive research group LD-96-1, a document of the Institute of Electrical Engineers of Japan.
18. FIG. 19 is a configuration diagram showing the iron core movable linear vibrator in the above-mentioned known material. In the drawing, 1 is a coil for passing an alternating current, 2 is a fixed iron core, 3 is a permanent magnet forming an N pole and an S pole, 4 is a gap formed between the coil 1 and the permanent magnet 3, and 12 is a movable iron core. It is.

Next, the operation will be described. In the above-described configuration, when an alternating current is applied to the coil 1, the armature magnetic field and the magnetic field of the permanent magnet 3 are superimposed. For example, as shown by the arrow in FIG. The movable iron core 12 vibrates by generating a reciprocating vibration magnetic field.

[0006]

When a compressor or the like is constructed of a movable magnet type as in the above-mentioned conventional example 1, the movable magnetic circuit is composed of only the permanent magnet 3 for the purpose of reducing the weight of the movable portion. In the above configuration, the magnetic flux of the permanent magnet 3 is generated in the gap 4, but when the permanent magnet 3 is displaced from the center of the gap, the permanent magnet 3 moves in a direction to increase the displacement, and the fixed core 2 Alternatively, the user tries to adsorb to the back yoke 6. Therefore, if the compliant mechanism 8 is devised,
The rigidity and assembly accuracy of the support member 5 and the holding member 7 must be ensured, and the configuration of the vibrator is complicated, and the manufacturing becomes difficult.

In the vibrator shown in the conventional example 2, the magnetic flux path generated by the coil 1 is a permanent magnet 3 having a large magnetic resistance.
, The magnetic resistance of the magnetic field generated by the coil 1 is substantially only the magnetic resistance of the air gap 4. However, since the air gap 4 is generally formed by a minute gap, the magnetic resistance is small. 1 has a large self-inductance. As a result, there are problems such as a decrease in power factor, an increase in coil terminal voltage, and an increase in electrical time constant, resulting in a decrease in responsiveness. Also,
Since the magnetic flux path generated by the coil 1 avoids the permanent magnet 3 having a large magnetic resistance, the movable core 12
The magnetic path of the air gap 4 changes abruptly due to the reciprocating vibration of the element, and the self-inductance changes accordingly, resulting in a fluctuation in the terminal voltage and a decrease in the electrical controllability of the vibrator. There were also problems.

In each of the prior arts 1 and 2, only one movable iron core can be provided for one coil. Therefore, when a vibrator in which a plurality of movable elements vibrate is formed, the number of movable elements is equal to the number of movable elements. There was also a problem that a coil was required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a highly efficient movable core linear oscillator having a small coil inductance. It is another object of the present invention to obtain an iron core movable linear vibrator having a lightweight and simple structure. It is another object of the present invention to obtain a core movable linear vibrator that can drive a plurality of movable cores with one coil. It is another object of the present invention to obtain a highly efficient, lightweight and simple linear compressor having the movable iron core linear vibrator of the present invention.

[0010]

SUMMARY OF THE INVENTION A movable iron core linear oscillator according to the present invention includes a coil for generating an alternating magnetic field, a fixed iron core fixed to the coil, and a movable iron core disposed between the fixed iron core and a gap. , At least one set of at least one set of one having the same magnetization direction as the magnetic flux direction of the coil and one having the magnetization direction opposite to the magnetic flux direction of the coil facing the gap in the magnetic flux path of the coil of the fixed iron core It has a permanent magnet arranged.

Further, the permanent magnet is included in the vicinity of the gap surface of the fixed iron core and joined.

Further, the shape of the movable iron core is formed to be convex with respect to a set of permanent magnets.

The fixed iron core and the movable iron core are formed in a cylindrical shape by laminating laminated steel plates radially, and a gap is formed by the inner peripheral surface of the fixed iron core and the outer peripheral surface of the movable iron core. is there.

Further, the fixed iron core and the movable iron core are formed in a cylindrical shape by laminating laminated steel sheets concentrically, and the gap is formed in the radial direction.

A coil for generating an alternating magnetic field, a first fixed iron core fixed to the coil, a second fixed iron core disposed opposite to the first fixed iron core, a first fixed iron core and a second fixed iron core. A movable iron core arranged with a gap between the second fixed iron core and a coil having the same magnetization direction as the coil in the magnetic flux direction facing the gap in the magnetic flux path of the coil of the first fixed core. And a permanent magnet composed of a magnetizing direction opposite to the magnetic flux direction.

A coil for generating an alternating magnetic field, a first fixed iron core fixed to the coil, a second fixed iron core disposed opposite to the first fixed iron core, a first fixed iron core and a second fixed iron core. At least one pair or more of the movable cores disposed with a gap between the two fixed cores, facing the gap in the magnetic flux path of the coil of the first fixed core, the same magnetization direction as the magnetic flux direction of the coil And permanent magnets arranged in plural sets so that a pair of movable iron cores vibrate in the same direction as one set of the permanent magnet and the magnetized direction opposite to the magnetic flux direction of the coil.

A coil for generating an alternating magnetic field, a first fixed iron core fixed to the coil, a second fixed iron core disposed opposite to the first fixed iron core, a first fixed iron core and a second fixed iron core. At least one pair or more of the movable cores disposed with a gap between the two fixed cores, facing the gap in the magnetic flux path of the coil of the first fixed core, the same magnetization direction as the magnetic flux direction of the coil And permanent magnets arranged in plural sets such that a pair of movable iron cores vibrate in opposition to each other, as a set of the magnetic core and the magnetizing direction opposite to the magnetic flux direction of the coil.

The movable iron core is a laminated steel sheet having a surface substantially perpendicular to the moving direction of the movable iron core, and a fixed point is provided by joining a part of the laminated steel sheet.

Further, a non-magnetic material is joined to the permanent magnet facing the air gap.

Further, the permanent magnet is included and joined in the vicinity of the gap surface of the first fixed iron core.

The first fixed iron core, the second fixed iron core, and the movable iron core are formed by radially laminating laminated steel sheets to form a cylindrical shape, and the gap is formed on a circumferential surface.

Further, a linear compressor according to the present invention has the movable iron core linear oscillator according to any one of claims 1 to 6, wherein the movable iron core of the movable iron core linear oscillator is integrated with the cylinder. The cylinder is reciprocally oscillated by a driving force acting on the movable iron core.

Further, there is provided the movable iron core linear oscillator according to any one of claims 1 to 12, wherein the movable iron core of the movable iron core linear oscillator is integrated with the piston via a support member, and is movable. The piston is reciprocated by the driving force of the iron core.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a cross-sectional view showing a movable core linear oscillator according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a coil that generates an alternating magnetic field when an alternating current flows, 2 denotes a fixed iron core that forms a generated magnetic flux path of the coil 1, 3a and 3b are joined to the fixed iron core 2,
The permanent magnet is arranged in the magnetic flux path of the coil 1. The arrow of the permanent magnet 3 in the figure indicates the direction of magnetization. The permanent magnet 3a is magnetized in the + x direction of the illustrated coordinate axes, and the permanent magnet 3b is magnetized in the -x direction. The permanent magnetic poles 3a and 3b can be configured by an integral permanent magnet, or by arranging two or more segment magnets having different magnetization directions. Reference numeral 4 denotes a gap separating the fixed iron core 2 and the movable iron core 12 forming a magnetic path. The dotted arrows in the figure indicate the magnetic field generated when a current flows through the coil 1 from the near side to the far side of the drawing.

Next, the operation will be described. The position of the movable core 12 shown in FIG. 1 is a neutral position. As shown in the figure,
Since the magnetization directions of the permanent magnet 3a on the upper part of the coil 1 and the permanent magnet 3b on the lower part of the coil 1 and the direction of the generated magnetic field of the coil 1 are the same, the permanent magnet 3a on the upper part of the coil 1 and the permanent magnet 3b on the lower part of the coil 1 increase. Magnetized, permanent magnet 3 on top of coil 1
Since the direction of magnetization of the permanent magnet 3b at the bottom of the coil 1 is different from the direction of the generated magnetic field of the coil 1, the permanent magnet 3b at the top of the coil 1 and the permanent magnet 3a at the bottom of the coil 1 are demagnetized.
Accordingly, the composite magnetic field of the magnetic field generated by the coil 1 and the magnetic fields of the permanent magnets 3a and 3b is as shown by the arrow in FIG. I do. When the current is reversed, the coil 1 moves in the -y direction according to the same principle.
, The movable iron core 12 reciprocates in the ± y direction.

As described above, according to the first embodiment, as is apparent from the magnetic path configuration shown in FIG. The effect of reducing the coil inductance is obtained. Further, since the magnetic flux of the permanent magnet 3 is directly used, there is an effect that high efficiency can be obtained. Further, since the movable portion has only the iron core without the permanent magnet 3, the complicated configuration as in the above-described conventional example 1 is not required, and the effect of simplifying and reducing the weight of the vibrator can be obtained.

In the configuration shown in FIG. 1, the movable iron core 12 has a convex shape with respect to the pair of permanent magnets 3a and 3b.
Although the two sets of permanent magnets are combined to form an inverted U shape,
This has the effect of increasing the permeance change when the movable iron core 12 moves, and has the effect of increasing the thrust of the vibrator. However, the rectangular movable iron core 12 as shown in FIG. 3 operates as a vibrator although the thrust is slightly lower than that of the movable iron core 12 in FIG. FIG.
Since the movable iron core 12 as described above is not an inverted U-shape but a rectangular shape, the movable element has a simple shape and has an effect of obtaining a vibrator excellent in mass productivity.

Further, as shown in FIG. 4, the gap 4 is increased by a non-magnetic material 13 such as aluminum, stainless steel, plastic, Teflon or the like, or as shown in FIG.
In the case where the fixed cores a and 3b are included in the vicinity of the air gap surface of the fixed core 2 and the fixed core 2 is magnetically saturated by the short-circuited magnetic flux of the permanent magnets 3a and 3b to effectively reduce the magnetic permeability, the first embodiment is used. The same effect can be obtained. When the non-magnetic member 13 is made of a resin having a small coefficient of friction, such as Teflon or polyimide, the movable iron core 12 can be brought into contact with the non-magnetic member 13 and slid, and the effect of omitting a bearing can be obtained.

As shown in FIG. 6, the permanent magnets 3a,
If the arrangement of 3b is arranged at one location at the upper end of the fixed iron core 2, the number of attachment points between the fixed iron core 2 and the permanent magnets 3a and 3b can be reduced, and the effect of improving the assemblability can be obtained.

As shown in FIG. 7, it is also conceivable to integrate the two magnetic paths shown in FIG. Fixed iron core 2
Can be integrated, so that the assemblability during mass production is improved.
Further, since the movable iron core 12 is formed with the same structure, parts can be shared, and an effect that production can be performed at low cost is obtained.

Embodiment 2 Fixed core 2 of linear oscillator
The movable core 12 has the cross-sectional shape shown in FIG. 1 described above. However, since an alternating magnetic field is generated and an eddy current is generated, the fixed core 2 and the movable core 12 of the linear vibrator are formed into a laminated steel plate, and the It is conceivable to reduce the loss.

FIG. 8 is a perspective view showing a movable core type linear vibrator according to Embodiment 2 of the present invention. As shown in the figure, this is an example in which the linear vibrator shown in FIG. 1 is laminated on a flat plate. With such a flat structure, the effect of reducing the loss due to the eddy current and reducing the thickness of the vibrator itself can be obtained.

Embodiment 3 However, the piston
In order to incorporate the flat plate type vibrator as shown in FIG. 8 into the compressor in which the cylinder relatively reciprocates, a support member for separately transmitting a driving force to the piston or the cylinder is required. Therefore, in the present embodiment, the fixed iron core 2 and the movable iron core 12 are formed in a cylindrical shape, and the cylinder of the compressor and the movable iron core 12 are integrated with a simple structure, and the support member is omitted.

FIG. 9 is a perspective view showing a core movable linear vibrator according to Embodiment 3 of the present invention.
It is composed of a 0-degree cylinder, which is extracted by 90 degrees. In the figure, the magnetization direction of the permanent magnet 3 in the case of a cylindrical configuration is the radial direction.

As shown in the drawing, this is an example in which the linear vibrator shown in FIG. 1 is formed in a cylindrical shape, and the fixed iron core 2 and the movable iron core 12 are formed in a cylindrical shape by laminating laminated steel plates radially. I have. Further, in this configuration, the gap 4 is formed between the circumferential surface of the cylinder, that is, the outer peripheral surface of the movable core and the inner peripheral surface of the fixed core 2.

FIG. 10 is a sectional view showing an example in which the linear oscillator shown in FIG. 9 is integrated with a cylinder. In the figure, 10 is a cylinder, 14 is a fitting member, and 15 is a screw. As shown in FIG.
A fitting member 14 is provided at the upper and lower ends of the fitting member 14, and the fitting member 14 is pressed in the cylinder direction to be integrated by a screw 15 penetrating the fitting member 14. Thereby, the cylinder 10 and the movable iron core 12 can be easily integrated, and there is an effect that a compressor excellent in mass productivity can be obtained.

Further, as shown in FIG. 10 (b), forming the fitting member 14 in a tapered shape increases the contact pressure between the cylinder 10 and the movable iron core 12, and the cylinder 1
0 and the movable iron core 12 can be more firmly integrated.

Embodiment 4 FIG. In the laminated structure shown in FIG. 9, since the fixed steel core 2 and the movable core 12 are formed in a cylindrical shape by radially laminating the laminated steel plates, it is necessary to make the side surfaces of the laminated steel plates tapered, which reduces mass productivity. I do. Therefore, in the present embodiment, the laminated steel plates are concentrically laminated to form the fixed iron core 2 and the movable iron core 12 in a cylindrical shape.

FIG. 11 is a configuration diagram showing a movable core type linear vibrator according to Embodiment 4 of the present invention.
11A is a perspective view, and FIG. 11B is a bottom view. As shown in the drawing, the fixed iron core 2 and the movable iron core 12 are formed by concentrically stacking semicircular laminated steel plates. Further, in the third embodiment, the gap 4 is formed on the circumferential surface of the cylinder, but in the present embodiment, the gap 4 is formed in the radial direction of the cylinder. Therefore, the gap surface of the present embodiment is narrower than that of the third embodiment, and the thrust of the vibrator is slightly inferior.

FIG. 12 is a block diagram showing another movable core type linear vibrator according to the fourth embodiment of the present invention.
FIG. 12A is a perspective view, and FIG. 12B is a bottom view.
In FIG. 12, the movable core 12 and the fixed core 2 are almost 18
Although it is constituted by two divisions of 0 degree, this may be further divided so that the movable core 12 is divided into 90 degrees and the fixed core 2 is divided into 90 parts as shown in FIG.

FIG. 13 is a perspective view showing an example in which the vibrator shown in FIGS. 11 and 12 is integrated with a cylinder. The cylinder 10 and the movable iron core 12 are fitted and integrated by a snap fit or the like. Alternatively, a screw is cut into the cylinder 10 and the movable iron core 12, and the cylinder 1 is tightened with a screw.
0 and the movable iron core 12 are integrated.

Embodiment 5 FIG. FIG. 14 is a sectional view showing a core movable linear vibrator according to Embodiment 5 of the present invention. In the figure, 21 is a first fixed iron core, 22 is a second fixed iron core, 41 is a first gap, 42 is a second gap, 1
2a and 12b are movable iron cores. 3a permanent magnet arrangement
3b-3b-3a, the movable iron cores 12a and 12b reciprocate in the same direction (± y direction) on the same principle as in the first embodiment.

As shown in the figure, the movable iron core 12 in FIG. 1 is replaced with the movable iron cores 12a and 12b and the second fixed iron core 2
By dividing into two, the weight of the movable cores 12a and 12b is reduced, and there is an effect of obtaining a lightweight movable core. Needless to say, any one of the movable iron cores 12a and 12b and one set of the permanent magnets 3a and 3b are movable.

FIG. 14B is a view showing the state of FIG.
Is different from the configuration shown in FIG.
3a and 3b. With such a configuration, since the magnetization direction of the permanent magnet 3a on the upper part of the coil 1 is the same as the direction of the generated magnetic field of the coil 1, the permanent magnet 3a on the upper part of the coil 1 is magnetized and the permanent magnet on the upper part of the coil 1 is increased. Since the direction of magnetization of 3b is different from the direction of the generated magnetic field of the coil 1, the permanent magnet 3b above the coil 1 is demagnetized. Therefore, the movable core 12a
Moves in the + y direction. Also, since the direction of magnetization of the permanent magnet 3b under the coil 1 is the same as the direction of the generated magnetic field of the coil 1, the permanent magnet 3b under the coil 1 is magnetized and the direction of magnetization of the permanent magnet 3a under the coil 1 is increased. And the direction of the generated magnetic field of the coil 1 is different, so that the permanent magnet 3a below the coil 1 is demagnetized. Therefore, the movable iron core 12b moves in the -y direction.

As described above, the movable iron cores 12a and 12b can vibrate oppositely. As a result, the exciting forces generated by the reciprocating vibrations of the movable iron cores 12a and 12b can be offset each other, so that the effect of significantly reducing the vibration noise of the linear vibrator itself can be obtained.

Embodiment 6 FIG. FIG. 15 is a perspective view showing a core movable linear vibrator according to Embodiment 6 of the present invention. In the drawing, reference numeral 16 denotes a steel plate fixing member for fixing the movable iron core 12 made of a laminated steel plate. A and C are the end portions of the laminated steel plate, and B is the permanent magnets 3a and 3b of the movable iron core 12.
This is a part opposed to. The fixed core 2 in FIG. 6 is formed in a U-shape, and the second fixed core 22 shown in FIG.
Also serves as a role. According to the same principle as in the first embodiment, the magnetic flux generated by applying an alternating current to the coil 1 and the combined magnetic field of the permanent magnets 3a and 3b vibrate in the vertical direction in FIG. Vibrates back and forth.

The movable iron core 12 is made of a laminated steel sheet. By joining the laminated steel sheet ends A and C to the steel sheet fixing member 16,
A spring having the laminated steel plate ends A and C as fixed ends is formed. In this configuration, the laminated steel sheet functions as a magnetic circuit, and also functions as a leaf spring with the laminated steel sheet ends A and C as fixed ends. Therefore, the resonance spring 11 as in the above-described conventional example 1 becomes unnecessary, and there is an effect that a vibrator having a lightweight and simple structure can be obtained.

A portion B indicated by a hatched portion is a portion of the movable iron core 12 facing the permanent magnets 3a and 3b, and this portion is integrated by caulking or bonding. By integrating the portion B, an effect of suppressing the penetration of the magnetic flux and the repulsion of the laminated plate members with each other can be obtained.

It should be noted that the same effect can be obtained by directly applying the structure of the present embodiment, which serves both as the movable core and the leaf spring, to the structure of the fifth embodiment.

Embodiment 7 FIG. FIG. 16 is a sectional view showing a linear compressor according to Embodiment 6 of the present invention, and is an example in which the cylindrical linear vibrator shown in FIG. 9 is mounted on a linear compressor. In the figure, 9 is a movable cylinder 10
Is a resonance spring that operates the compressor in a resonance system, and a mechanical system resonance frequency determined by a coil energizing frequency, a movable portion mass, and the resonance spring 11 is matched. The compressor can be operated with high efficiency and high power factor. Reference numeral 17 denotes a suction valve which is connected to a low-pressure portion (not shown) and is opened only when gas is sucked from the low-pressure portion, and 18 is connected to a high-pressure portion (not shown) to open and discharge compressed gas only when discharging to the high-pressure portion. It is a discharge valve. As a configuration of the suction valve 17 and the discharge valve 18, a reed valve constituted by a general compressor can be considered. Also,
When controlling the valve operation, an electromagnetic valve or the like may be used.

The magnetization directions of the permanent magnets 3a and 3b are as follows.
1 is the same as the case defined in FIG. 1, but as shown by the arrow in FIG. 16, the magnet magnetic field direction and the current direction are drawn symmetrically about the central axis on the 180-degree cross-sectional view. Further, the cylinder 10 and the movable iron core 12 are joined and configured to operate integrally.

Next, the operation will be described. As described above, when an alternating current is applied to the coil 1, the movable iron core 12 reciprocates. Cylinder 10 connected to movable iron core 12
Also starts reciprocating vibration by the driving force of the movable iron core 12.
When the cylinder 10 moves away from the piston 9, the pressure in the compression chamber formed by the piston and the cylinder becomes negative, causing a pressure difference between the compression chamber and the low-pressure section, and the suction valve 17 opens to suck the working fluid. At this time, the discharge valve 18 is in a closed state. When the cylinder 10 passes the bottom dead center (the position where the distance between the piston and the cylinder is farthest), the moving direction of the cylinder 10 is reversed to the piston 9 side. At that time, the suction valve 17 is closed, the working fluid is pressurized, and the compression stroke starts. As the cylinder 10 moves toward the piston 9, the compression proceeds and the pressure increases. When the predetermined pressure is reached, the discharge valve 18 is opened, and the compressed working fluid is continuously supplied to the high-pressure section until the cylinder 10 reaches the top dead center (the position where the piston-cylinder is closest). Cylinder 10 at top dead center
Reverses the direction of movement. At that time, the discharge valve 18 closes, and the suction valve 17 opens to enter the suction stroke. The above operation is repeated to operate as a compressor.

In the above operation of the present configuration, if the discharge valve 18 is opened at the same time as the closing of the suction valve 17, there is no compression operation, and it is possible to operate as a pump that simply moves the working fluid.

Further, it is needless to say that the same function as a compressor is obtained even when the mounting positions of the suction valve 17 and the discharge valve 18 are interchanged. Also, in the figure, the suction valve 17 and the discharge valve 18 are reed valves, but a valve system other than the reed valve may operate as a compressor having the same configuration as the present invention.

Also, in a configuration in which the suction valve 17 is provided on the cylinder 10, the discharge valve 18 is provided on the piston 9, or the discharge valve 18 is provided on the cylinder 10, and the suction valve 17 is provided on the piston 9, the reciprocation of the movable iron core 12 is similarly performed. Needless to say, the suction compression is repeated by the vibration and the compressor operates as a compressor.

As described above, since the linear compressor according to Embodiment 7 of the present invention has the linear vibrator according to the present invention, the effect of obtaining a linear compressor having a small inductance change and a high power factor can be obtained. is there. Further, when the coil 1 is not energized, the movable iron core 12 has magnetic stability at the neutral position and has a magnetic spring effect, so that the spring constant of the resonance spring 11 can be reduced and the resonance spring 11 can be downsized. Is obtained. Further, since the movable iron core and the cylinder can be integrated, there is an effect that a linear compressor having a simple configuration can be obtained.

Embodiment 8 FIG. FIG. 17 is a sectional view showing a linear compressor according to an eighth embodiment of the present invention, in which the linear vibrator of FIG. 14B is mounted on a linear compressor. Since the linear vibrator shown in FIG. 14B is an opposing vibrator in which the movable iron cores 12a and 12b vibrate in opposition to each other, the linear vibrator can be applied to an opposing two-cylinder linear compressor. FIG. 17 is a cross-sectional view of a case where the vibrator having the cross-sectional shape shown in FIG. 14B has a cylindrical laminated structure as in FIG. In the figure, 5 is a movable iron core 1
2 is a supporting member for transmitting the reciprocating driving force applied to the piston 2 to the piston 9. The suction valve 17 is connected to a low-pressure part (not shown), and the discharge valve 18 is connected to a high-pressure part (not shown).

Next, the operation will be described. When the coil 1 is energized, the movable iron cores 12a and 12b reciprocate in directions opposite to each other to move the piston 9 according to the principle described in the fifth embodiment. When the piston 9 moves toward the bottom dead center, the suction valve 17 provided in the cylinder 10 opens. When the piston 9 reaches the predetermined pressure when moving and compressing toward the top dead center, the discharge valve 18 is opened to open the high pressure gas. To operate as a compressor.

As described above, since the linear compressor according to the eighth embodiment of the present invention has the linear vibrator according to the present invention, the phase of the movement of the piston is inverted, and the vibration generated in the compressor body is reduced. The effect of canceling out and reducing vibration and noise can be obtained. Further, since two movable iron cores can be driven by one coil, it is possible to obtain the effect of reducing parts cost and control circuit.

In Embodiment 8, two movable iron cores are used. However, it is needless to say that two or more movable iron cores can be reciprocally oscillated by the same principle.

Further, in the above-mentioned Embodiment 8, FIG.
In the example in which the linear vibrator (b) is mounted on a linear compressor, the movable core 12 is connected to the piston 9 via the support member 5.
It is needless to say that if the configuration is such that it is connected to any of the linear vibrators described in the above embodiments,

Also, the compressor described in the seventh and eighth embodiments has a function as a fluid transfer pump at the same time. Further, it can operate only as a pump depending on the opening timing of the suction valve and the discharge valve. Therefore, it is needless to say that the same effects can be obtained even when the seventh and eighth embodiments are applied to a pump.

[0063]

As described above, according to the first aspect of the present invention, a coil for generating an alternating magnetic field, a fixed core fixed to the coil, a movable core disposed through a gap with the fixed core, Facing the air gap in the magnetic flux path of the coil of the fixed core, at least one or more sets of one having the same magnetization direction as the coil magnetic flux direction and one having the opposite magnetization direction to the coil magnetic flux direction are arranged as one set. Since the permanent magnet is provided, there is an effect that a highly efficient oscillator having a small coil inductance can be obtained. Further, there is an effect that a vibrator having a light weight and a simple structure can be obtained.

Further, according to the second aspect of the present invention, since the permanent magnet is enclosed and joined in the vicinity of the gap surface of the fixed iron core, there is an effect that a vibrator excellent in mass productivity can be obtained.

According to the third aspect of the present invention, since the shape of the movable iron core is formed to be convex with respect to a set of permanent magnets, an effect of increasing the thrust of the movable iron core can be obtained.

According to the fourth aspect of the present invention, the fixed iron core and the movable iron core are formed in a cylindrical shape by radially stacking laminated steel plates, and the gap is formed between the inner peripheral surface of the fixed iron core and the movable iron core. Since the vibrator is formed on the outer peripheral surface, when the vibrator is mounted on a compressor or the like, an effect that integration with a cylinder or the like can be easily obtained is obtained.

According to the fifth aspect of the present invention, the fixed iron core and the movable iron core are formed in a cylindrical shape by laminating laminated steel sheets concentrically, and the gap is formed in the radial direction. When a vibrator is mounted on a compressor or the like, formation of a laminated core and integration with a cylinder or the like can be easily performed, and there is an effect that a vibrator having higher mass productivity can be obtained as compared with the fourth embodiment.

According to the present invention, a coil for generating an alternating magnetic field, a first fixed core fixed to the coil, and a second fixed core arranged opposite to the first fixed core. The fixed core, the movable core disposed with a gap between the first fixed core and the second fixed core, the magnetic flux of the coil facing the gap in the magnetic flux path of the coil of the first fixed core. Since the permanent magnet composed of the one having the same magnetization direction as the one and the one having the magnetization direction opposite to the magnetic flux direction of the coil is provided, there is an effect that a lightweight vibrator can be obtained.

According to the seventh aspect of the present invention, a coil for generating an alternating magnetic field, a first fixed iron core fixed to the coil, and a second fixed iron core arranged opposite to the first fixed iron core. Fixed core, at least one or more movable cores arranged with a gap between the first fixed core and the second fixed core, facing the gap in the magnetic flux path of the coil of the first fixed core. A permanent magnet in which a plurality of pairs of permanent magnets are arranged so that a pair of movable cores vibrate in the same direction as a set of a magnetized direction that is the same as the magnetic flux direction of the coil and a magnetized direction opposite to the magnetic flux direction of the coil. With this arrangement, an effect that one coil can drive a plurality of movable iron cores can be obtained.

According to the eighth aspect of the present invention, a coil for generating an alternating magnetic field, a first fixed core fixed to the coil, and a second fixed core arranged opposite to the first fixed core. Fixed core, at least one or more movable cores arranged with a gap between the first fixed core and the second fixed core, facing the gap in the magnetic flux path of the coil of the first fixed core. A permanent magnet in which a plurality of pairs of permanent magnets are arranged so that a pair of movable iron cores vibrate opposite to each other as a set of one having the same magnetization direction as the magnetic flux direction of the coil and one having the opposite magnetization direction to the magnetic flux direction of the coil. With this arrangement, an effect that one coil can drive a plurality of movable iron cores can be obtained. Further, since the pair of movable cores vibrate opposite to each other, the exciting forces can be canceled each other, and there is an effect that a vibrator with low vibration and low noise can be obtained.

According to the ninth aspect of the present invention, the movable iron core is a laminated steel sheet having a surface substantially perpendicular to the moving direction of the movable iron core. Since it is provided, the resonance spring can be omitted, and there is an effect that a vibrator having a lightweight and simple structure can be obtained.

According to the tenth aspect of the present invention, since the non-magnetic material is bonded to the permanent magnet so as to face the air gap, there is an effect that a highly efficient vibrator can be obtained.

According to the eleventh aspect of the present invention, since the permanent magnet is included and joined near the gap surface of the first fixed iron core, there is an effect that a highly efficient vibrator can be obtained.

According to the twelfth aspect of the present invention, the first fixed iron core, the second fixed iron core, and the movable iron core are formed by laminating laminated steel sheets radially to form a cylindrical shape, and the air gap is defined by a circumference. Since the vibrator is formed on the surface, when the vibrator is mounted on a compressor or the like, an effect of easily integrating the vibrator with a cylinder or the like is obtained.

According to a thirteenth aspect of the present invention, there is provided a linear compressor according to the present invention, comprising the core movable linear vibrator according to any one of the first to sixth aspects. The movable core of the linear oscillator is integrated with the cylinder,
Since the cylinder is configured to reciprocate with the driving force acting on the movable iron core, there is an effect that a linear compressor with a small inductance change and a high power factor can be obtained. Further, there is an effect that a linear compressor having a light weight and a simple structure can be obtained.

According to a fourteenth aspect of the present invention, there is provided the core movable linear vibrator according to any one of the first to twelfth aspects, wherein the movable core of the movable core linear vibrator is a supporting member. And the piston is reciprocally oscillated by the driving force of the movable iron core, so that there is an effect that a small change in inductance and a high power factor linear compressor can be obtained. Further, there is an effect that a linear compressor having a light weight and a simple structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a movable core type linear vibrator according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating an operation principle of the iron core movable linear vibrator according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing another movable core type linear vibrator according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing another core movable linear vibrator according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing another iron core movable linear vibrator according to the first embodiment of the present invention.

FIG. 6 is a sectional view showing another iron core movable linear vibrator according to the first embodiment of the present invention.

FIG. 7 is a sectional view showing another core movable linear vibrator according to the first embodiment of the present invention.

FIG. 8 is a perspective view showing a core movable linear vibrator according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing an iron core movable linear vibrator according to a third embodiment of the present invention.

FIG. 10 is a sectional view showing an example of integration of a movable core linear oscillator and a cylinder according to Embodiment 3 of the present invention.

FIG. 11 is a perspective view showing an iron core movable linear vibrator according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view showing another core movable linear vibrator according to Embodiment 4 of the present invention.

FIG. 13 is a sectional view showing an example of integration of a movable core linear oscillator and a cylinder according to a fourth embodiment of the present invention.

FIG. 14 is a perspective view showing an iron core movable linear vibrator according to a fifth embodiment of the present invention.

FIG. 15 is a perspective view showing an iron core movable linear vibrator according to a sixth embodiment of the present invention.

FIG. 16 is a sectional view showing a linear compressor according to Embodiment 7 of the present invention.

FIG. 17 is a sectional view showing a linear compressor according to an eighth embodiment of the present invention.

FIG. 18 is a sectional view showing a conventional linear compressor.

FIG. 19 is a sectional view showing a conventional iron core movable linear vibrator.

[Explanation of symbols]

1 coil, 2 fixed iron core, 3a, 3b permanent magnet, 4
Air gap, 5 support member, 9 piston, 10 cylinder, 11 resonance spring, 12 movable iron core, 17 suction valve,
18 Discharge valve

 ──────────────────────────────────────────────────の Continued from the front page (72) Inventor Masayuki Tsunoda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (14)

[Claims] 1. A coil for generating an alternating magnetic field, a fixed iron core fixed to the coil, a movable iron core interposed between the fixed iron core and an air gap, and a gap in a magnetic flux path of the coil of the fixed iron core. Facing, a permanent magnet in which at least one or more sets of magnets having the same magnetizing direction as the magnetic flux direction of the coil and a magnetizing direction opposite to the magnetic flux direction of the coil are arranged as one set. A movable core type linear vibrator. 2. The movable core-type linear vibrator according to claim 1, wherein the permanent magnet is enclosed and joined in the vicinity of a gap surface of the fixed iron core. 3. The movable core according to claim 1, wherein the shape of the movable core is convex with respect to the set of permanent magnets.
The described movable iron core linear vibrator. 4. The fixed core and the movable core are formed in a cylindrical shape by radially laminating laminated steel plates, and a gap is formed by an inner peripheral surface of the fixed core and an outer peripheral surface of the movable core. The movable core-type linear vibrator according to claim 1, wherein: 5. The fixed core and the movable core are formed in a cylindrical shape by laminating laminated steel plates concentrically, and the gap is formed in a radial direction of the cylinder.
4. The movable iron core linear oscillator according to any one of items 1 to 3. 6. A coil for generating an alternating magnetic field, a first fixed iron core fixed to the coil, a second fixed iron core arranged opposite to the first fixed iron core, The movable iron core disposed with a gap between the second fixed iron core and the first fixed iron core facing the air gap in the magnetic flux path of the coil in the same direction as the magnetic flux direction of the coil. An iron-core movable linear vibrator comprising a permanent magnet composed of a magnet having a magnetic direction and a magnet having a magnetization direction opposite to the magnetic flux direction of the coil. 7. A coil for generating an alternating magnetic field, a first fixed core fixed to the coil, a second fixed core disposed opposite to the first fixed core, At least one pair or more of movable iron cores arranged with an air gap between the second fixed iron core and the magnetic flux of the coil facing the air gap in the magnetic flux path of the coil of the first fixed iron core. A pair of permanent magnets having the same magnetizing direction as the direction and the magnetizing direction opposite to the magnetic flux direction of the coil was provided as a set, and a plurality of sets of permanent magnets were arranged so that the pair of movable cores vibrate in the same direction. A movable core type linear oscillator. 8. A coil for generating an alternating magnetic field, a first fixed core fixed to the coil, a second fixed core disposed opposite to the first fixed core, At least one pair or more of movable iron cores disposed with a gap between the second fixed core and the magnetic flux of the coil facing the gap in the magnetic flux path of the coil of the first fixed core. And a pair of permanent magnets arranged in such a way that the pair of movable cores vibrate in opposition to each other as one set of the same magnetizing direction and the magnetizing direction opposite to the magnetic flux direction of the coil. A movable core type linear oscillator. 9. The movable iron core is a laminated steel sheet having a surface substantially perpendicular to the moving direction of the movable iron core, and a fixed point is provided by joining a part of the laminated steel sheet. 9. The movable iron core linear oscillator according to any one of items 1 to 8. 10. The movable core-type linear vibrator according to claim 1, wherein a non-magnetic material is joined to the permanent magnet so as to face the air gap. 11. The movable core-type linear vibrator according to claim 6, wherein the permanent magnet is included in and joined to the vicinity of the gap surface of the first fixed iron core. . 12. The first fixed iron core, the second fixed iron core, and the movable iron core are formed by laminating laminated steel sheets radially to form a cylindrical shape, and the gap is formed on a circumferential surface. An iron core movable linear vibrator according to any one of claims 6 to 11. 13. The movable core of the iron core according to any one of claims 1 to 5, wherein the movable core of the movable core is integrated with a cylinder and acts on the movable core. A linear compressor characterized in that said cylinder is reciprocally oscillated by a driving force. 14. A movable iron core linear oscillator according to claim 1, wherein the movable iron core of the movable iron core linear oscillator is integrated with a piston via a support member, A linear compressor, wherein the piston is reciprocated by the driving force of the movable core.