JPH0458079A - Linear electric motor drive compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a linear motor-driven compressor that compresses fluid by linearly reciprocating a piston using a linear motor.

[Prior art] Fig. 3 shows, for example, refrigeration (vol. 54.N0J16.1).
979°ρ102) is a cross-sectional view showing a conventional linear motor-driven compressor. In the figure, (1) is the permanent magnet that constitutes the magnetic circuit of the linear motor, (Ia) is the gap in the magnetic circuit, (2) is the coil that receives force from the magnetic circuit to drive the piston, and (2a) is the coil. (2)
a non-metallic coil bobbin that fixes the coil bobbin, (3) a spring that constitutes a resonance circuit, (4) a piston joined to the coil (2), (5) a casing that constitutes a compressor,
(6) is an inlet opened in the casing (5), (7)
is the cylinder (8) fixed to the casing (5)
) is the suction valve provided at the tip of the piston (4), (9)
is a discharge valve provided at the tip of the cylinder (7), (1
0) is a discharge port through which compressed gas exits.

Next, the operation will be explained.

First, when current is supplied to the coil (2), the magnet (1)
Due to the electromagnetic attraction action on the coil (2), the piston (4) moves inside the cylinder (7) in the opposite direction to the discharge valve (9), and the inside of the compression chamber composed of the piston (4) and cylinder (7) moves. Since the volume increases, the waste is sucked in through the suction port (6). Gas passes through the suction valve (8) and is led into a compression chamber consisting of a piston (4) and a cylinder (7).

When the current to the coil (2) is reversed, the piston (
4) moves inside the cylinder (7) toward the discharge valve (9), and the volume inside the compression chamber composed of the piston (4) and cylinder (7) decreases, so the gas is compressed and the gas on the discharge side is compressed. When the pressure exceeds the pressure, the discharge valve (9) opens and discharges the compressed gas.

Incidentally, the coil bobbin (2a) is made of a non-metallic material because eddy current is generated by movement in the magnetic circuit and becomes resistance.

[Problems to be Solved by the Invention] Since the conventional linear electric W drive compressor is configured as described above, the coil bobbin that fixes the coil is made of non-metal, and is usually made of plastic or the like. Therefore, in large linear motors whose mechanical strength is weak and the force applied to the coils is large, the coil bobbin becomes large, resulting in a gap (I) in the magnetic circuit in which the coil moves.
There was a problem that a) became large and the performance of the linear motor deteriorated.

This invention was made in order to solve the above-mentioned problems, and aims to provide a high-performance linear electric II drive compressor by making the coil bobbin metal and reducing the size and weight. It is.

[Means for Solving the Problems] A linear motor-driven compressor according to the present invention uses a metallic coil bobbin, and has a plurality of slits formed in the coil bobbin along the moving direction of the coil.

[Function] The coil bobbin of the linear motor-driven compressor according to the present invention is composed of a metal coil bobbin with a plurality of slits along the moving direction of the coil, so eddy current loss is reduced and performance is improved. There is no decrease in mechanical strength, and mechanical strength increases. Furthermore, there is no need to increase the gap (1a) in the magnetic circuit in which the coil moves, resulting in improved performance and reliability.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows a linear electric a! according to an embodiment of the present invention. FIG. 2 is a sectional view showing a drive compressor, and FIG. 2 is a sectional view showing a coil bobbin according to an embodiment of the present invention. In each country,
(1) is a permanent magnet that constitutes the magnetic circuit of a linear motor;
(1a) is the gap in the magnetic circuit, (2) is the coil that receives force from the magnetic circuit to drive the piston, (2b) is the metal coil bobbin that fixes the coil (2), (
2C) is a slit provided in the coil bobbin (2b), and a plurality of slits are provided along the moving direction of the coil (2).

(3) is a spring that constitutes a resonant circuit, and (4) is a coil (2
), (5) is the casing that constitutes the compressor, (6) is the suction port opened in the casing (5), and (7) is the cylinder fixed to the casing (5) (8 ) is a suction valve provided at the tip of the piston (4), (9) is a discharge valve provided at the tip of the cylinder (7), and (lO) is a discharge port through which the compressed gas exits.

Next, the operation will be explained.

First, when current is supplied to the coil (2), the magnet (1)
Due to the electromagnetic attraction action on the coil (2), the piston (4) moves inside the cylinder (7) in the opposite direction to the discharge valve (9), and the inside of the compression chamber composed of the piston (4) and cylinder (7) moves. Since the volume increases, gas is inhaled through the suction port (6). Gas passes through the suction valve (8) and is led into a compression chamber consisting of a piston (4) and a cylinder (7).

When the current to the coil (2) is reversed, the piston (
4) moves inside the cylinder (7) toward the discharge valve (9), and the volume inside the compression chamber composed of the piston (4) and cylinder (7) decreases, so the gas is compressed and the gas on the discharge side is compressed. When the pressure exceeds the pressure, the discharge valve (9) closes and discharges the compressed gas.

In addition, since the coil bobbin (2b) is a metal coil bobbin, eddy currents are generated, and if there is no slit or there are few slits (one slit), current will flow in the circumferential direction of the coil bobbin, creating resistance. In the product of this invention, multiple slits (2C) (several tens of slits) are cut in the moving direction of the coil, so the current becomes smaller and the resistance becomes smaller, resulting in smaller eddy current loss and lower performance. There's nothing to do. Further, since the coil bobbin (2b) is a metal coil bobbin, it has strong mechanical strength, and there is no need to increase the gap (la) of the magnetic circuit in which the coil moves, so that the performance of the linear motor does not deteriorate.

[Effects of the Invention] As described above, according to the present invention, a metallic coil bobbin is used and a plurality of slits are provided in the coil bobbin along the moving direction of the coil, so the mechanical strength is stronger than that of the conventional method. Since a metal bobbin can be used, the coil bobbin can be made thinner and the magnetic circuit gap (la) can be narrowed.
Therefore, the performance and reliability of the linear motor are improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a linear motor-driven compressor according to an embodiment of the present invention, FIG. 2 is a sectional view showing a coil bobbin according to an embodiment of the invention, and FIG. 3 is a conventional linear motor-driven compressor. FIG. In the figure, (1) is a permanent magnet, (2) is a coil, and (2) is a permanent magnet.
b) is a coil bobbin, (2c) is a slit, and (4) is a piston. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a linear motor-driven compressor that drives a piston by passing current through a coil in a magnetic circuit, the coil bobbin that fixes the coil is made of metal, and the metal coil bobbin has a A linear motor-driven compressor characterized by having multiple slits.