JP2002070735A - Manufacturing method of gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacturing method of a gas compressor to increase the performance of the gas compressor using a twin magnetic circuit type linear motor. SOLUTION: A first part and a secondary part of a coil are arranged in a first space and a secondary space respectively. A magnetic flux is generated in the opposite direction with each other in the first and secondary spaces. At first, a stroke design value of a piston is determined. When the piston is displaced by the stroke design value to the secondary space, an end of the first part of the coil at the secondary space does not enter the secondary space, and also when the piston is kept away from a boundary of the first and secondary spaces by not less than the first distance and displaced into the first space by the stroke design value, the coil is arranged so that an end of the secondary part of the coil at the first space does not enter the first space and be kept away from the boundary of the first and secondary spaces by not less than the first distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a gas compressor, and more particularly to a method for manufacturing a twin magnetic circuit type gas compressor.

[0002]

2. Description of the Related Art FIG. 1 is a sectional view of a gas compressor using a twin magnetic circuit type linear motor. The linear motor used in the gas compressor shown in FIG. 1 has the same basic structure as the linear motor used in the gas compressor according to the embodiment of the present invention.

A cylindrical concave portion is formed from one end face (right end face in FIG. 1) of a cylindrical iron magnet yoke 1 along a central axis thereof. This recess defines the cylinder 2. A piston 3 is inserted into the cylinder 2. The piston 3 is supported by an elastic member such as a coil spring so as to be able to reciprocate in the axial direction of the cylinder 2. A compression chamber 5 is defined between the bottom surface of the cylinder 2 and the tip of the piston 3. The compression chamber 5 communicates with an external space via a through hole 6 formed in the magnet yoke 1.

[0004] A cylindrical recess 10 surrounding the cylinder 2 is formed in the magnet yoke 1. A permanent magnet 11 is embedded in the outer peripheral side surface of the cylindrical concave portion 10. The permanent magnet 11 includes a first magnet 11A and a second magnet 1
1B. 1st magnet 11A and 2nd
The magnet 11B has an annular shape along the outer peripheral side surface of the concave portion 10 and is arranged at a certain interval in the axial direction of the cylinder 2.

[0005] The first magnet 11A has an N-pole on its inner peripheral surface and an S-pole on its outer peripheral surface. Second magnet 11B
Has a polarity opposite to the polarity of the first magnet 11A, its inner peripheral surface side is an S pole, and its outer peripheral surface side is an N pole. First
The magnetic flux 13 emitted from the N pole (inner peripheral surface) of the magnet 11A crosses the space in the concave portion 10 in the radial direction, and
Then, it again crosses the space in the concave portion 10 and reaches the S pole (inner peripheral surface) of the second magnet 11B. Second magnet 11B
The magnetic flux 14 emitted from the N pole (outer peripheral surface) of the first magnet 11A reaches the S pole (outer peripheral surface) of the first magnet 11A via the inside of the magnet yoke 1.

The rear end of the piston 3 (the end opposite to the compression chamber 5 side) extends to the outside of the cylinder 2 and is fixed to the coil bobbin 15. The coil bobbin 15 is
It has a cylindrical portion that is inserted into the zero. The movable coil 17 is wound around this cylindrical portion. Moving coil 17
Is configured to include a first portion 17A and a second portion 17B. The first portion 17A of the movable coil 17 and the second portion
Are linked to the magnetic flux 13.

When a current is applied to the movable coil 17, Lorentz force is generated, and the movable coil 17 is driven in the axial direction of the cylinder 2. At this time, a current is caused to flow through the first portion 17A and the second portion 17B so that Lorentz force in the same direction is generated.

The efficiency of the linear motor can be improved by constructing the permanent magnet 11 with two parts, a first magnet 11A and a second magnet 11B, and arranging coils corresponding to each part. .

[0009]

When the gas compressor using the twin magnetic circuit type linear motor shown in FIG. 1 was actually operated, the expected improvement in efficiency was not found.

An object of the present invention is to improve the efficiency of a gas compressor using a twin magnetic circuit type linear motor.

[0011]

According to one aspect of the present invention, a cylinder, a piston inserted into the cylinder and capable of reciprocating along an axis of the cylinder, and fixed to one of the cylinder and the piston. A magnetic flux generating means and a coil fixed to the other, the magnetic flux generating means defining first and second spaces arranged in the cylinder axis direction;
And generating magnetic fluxes in mutually opposite directions in the second space, wherein the coil is provided with a first portion disposed in the first space and a second portion disposed in the second space. And
A method of manufacturing a gas compressor, wherein a Lorentz force is generated in the same direction of a cylinder shaft when an electric current is applied to the first and second portions, wherein a stroke design value of the piston is The step of determining, and when the piston is displaced toward the second space by the stroke design value, the end of the first portion of the coil on the second space side enters the second space. And when the piston is displaced from the boundary between the first and second spaces by at least a first distance and the piston is displaced toward the first space by a stroke design value, the first portion of the second portion of the coil The first and second portions of the coil are arranged such that an end on the space side does not enter the first space and is separated from the boundary between the first and second spaces by the first distance or more. Providing a method of manufacturing a gas compressor including the steps of:

[0012] Even if the piston is displaced beyond the stroke design value, if the amount of displacement exceeds the first distance,
The first portion and the second portion do not enter the second space and the first space, respectively. For this reason, it is possible to prevent the occurrence of Lorentz forces in the first and second portions, which are opposite to each other.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing embodiments of the present invention,
The reason why the expected efficiency of the conventional gas compressor could not be improved will be considered. Usually, the first portion 17A of the movable coil 17 is arranged in a space where the magnetic field is directed toward the center of the cylinder 2, and the second portion 17B is
The magnetic field is arranged in a space heading away from the cylinder 2.

In the gas compressor shown in FIG. 1, when the piston 3 reciprocates at a certain stroke, the movable coil 17 moves.
Also reciprocates with the same stroke. Consider a case where the piston 3 is displaced to the right in FIG. At this time, when a part of the first portion 17A of the movable coil 17 enters into the magnetic field space that moves away from the cylinder 2, the portion that enters the space generates Lorentz force in the opposite direction to the other portions. Will receive it. It is considered that the efficiency of the gas compressor is reduced due to the Lorentz force in the opposite direction. The embodiment described below prevents the generation of the opposite Lorentz force.

FIG. 1 shows a cross-sectional view of a gas compressor manufactured by a method according to an embodiment of the present invention. Since the configuration of the gas compressor has already been described, the description is omitted here.

FIG. 2 is a graph showing the positional relationship between the permanent magnet 11 and the movable coil 17 of the gas compressor according to the embodiment, and the distribution of magnetic flux density. The horizontal axis is the cylinder 2 shown in FIG.
In the axial direction. The vertical axis represents the magnetic flux density in the unit “Tesla”.

The first space 21A and the second space 2 are arranged in such a manner that the permanent magnets 11A and 11B are arranged along the axial direction of the cylinder.
Define 1B. The length of the permanent magnets 11A and 11B in the cylinder axis direction is 16 mm, and the interval between them is 4 mm.
It is. In the first space 21A and the second space 21B,
Moving coils 17A and 17B are arranged respectively.

Each broken line in the figure shows the measurement result of the magnetic flux density in the first and second spaces 21A and 21B. The reason why a plurality of polygonal lines are shown is because the result of the measurement performed a plurality of times at intervals is shown. The lines of magnetic force in the first space 21A are directed from the magnet 11A to the magnet yoke 1 facing the magnet 11A with the first space 21A interposed therebetween.
The directions of the magnetic force lines in the second space 21B are opposite. Opposite currents flow through the movable coils 17A and 17B, and a Lorentz force in the same direction is generated in both.

Next, a method of manufacturing the gas compressor according to the embodiment will be described. First, a stroke design value of the piston 3 shown in FIG. 1 is determined.

It is assumed that the coil bobbin 15 is displaced from the first space 21A toward the second space 21B by a stroke design value. Here, the stroke design value means the amplitude of the reciprocating motion of the piston, and the case where the piston is displaced by the stroke design value means the case where the piston is displaced from the neutral point of the reciprocating motion by half the stroke design value. At this time, when the end of the movable coil 17A on the side of the second space 21B enters the second space 21B, a Lorentz force in a direction opposite to the other portion is generated in the intruded portion. In order to prevent the generation of the Lorentz force in the opposite direction, it is necessary to prevent the movable coil 17A from entering the second space 21B.

However, the movable coil 17A may be displaced beyond the stroke design value due to variations in the assembly accuracy of the gas compressor, fluctuations in the neutral point of the piston during operation, and the like. Accordingly, when the movable coil 17A is displaced toward the second space by the stroke design value, the movable coil 1
A distance (margin distance) between the end of 7A on the second space 21B side and the boundary between the first and second spaces 21A and 21B.
The movable coil 17A is arranged so as to be separated by the distance above. Similarly, when the movable coil 17B is displaced toward the first space by the stroke design value, the movable coil 17B
The end on the 1A side is the first and second spaces 21A and 21B.
The movable coil 17B is arranged so as to be separated from the boundary by a distance equal to or more than the above-mentioned margin distance.

As described above, the movable coils 17A and 17B
Is arranged, each movable coil becomes the first and second movable coils.
Moving across the boundary between the spaces 21A and 21B can be prevented. For this reason, it is possible to avoid the generation of Lorentz forces in the moving coils 17A and 17B in directions opposite to each other, thereby preventing a decrease in operating efficiency.

In order to obtain a sufficient effect, it is preferable that the above-mentioned margin distance is set to 1/5 or more of the stroke design value. This is because the neutral position of the stroke may shift due to the generation of the offset current. The magnet length (length in the cylinder axis direction) of each of the permanent magnets 11A and 11B is FL, the coil length (length in the cylinder axis direction) of each of the movable coils 17A and 17B is CL, the first space 21A and When the length of each cylinder 21B in the cylinder axis direction is SL, the maximum value of the margin distance is (FL + SL)
-CL.

FIG. 3 is a cross-sectional view of a piston-opposed gas compressor manufactured by the method for manufacturing a gas compressor according to the embodiment. The two gas compressors shown in FIG. 1 are arranged so that the pistons 3 face each other. Each component of the gas compressor of FIG. 3 is denoted by the same reference numeral as that of the corresponding component of FIG. The two compression chambers 3 communicate with each other via a through hole 6. The through hole 6 is formed in the gas passage 30 formed in the magnet yoke 1.
Through to the outside space.

The two gas compressors are housed in a case 31. End face of magnet yoke 1 and case 31
Is formed between the piston 3 and the coil bobbin 15 for reciprocating motion. A recess 33 is formed in each of the pistons 3 along the central axis from the rear end face. The coil spring 32 connects the bottom surface of the concave portion 33 and the inner surface of the case 1. The coil spring 32 elastically supports the piston 3 so as to be able to reciprocate in the axial direction.

External terminals 34 and 36 are attached to the case 1. A lead wire 35 connects the external terminal 34 and the coil spring 32. External terminal 36 and movable coil 1
7B is connected to the lead wire 37. Coil spring 32
Are electrically connected to the movable coil 17A. The movable coils 17A and 17B are connected to each other so that currents in opposite directions flow in both. External terminals 34 and 3
From 6, the current can flow to the movable coil 17 via the lead wires 35 and 37 and the coil spring 32.

The two single-piston type gas compressors constituting the opposed-piston type gas compressor shown in FIG. 3 are manufactured by the method according to the embodiment of the present invention. For this reason, even when the piston 3 is displaced beyond the stroke design value,
A decrease in operating efficiency can be prevented.

The present invention has been described in connection with the preferred embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0029]

As described above, according to the present invention,
It is possible to prevent the occurrence of Lorentz forces opposite to each other in one movable coil, and to prevent a decrease in the operating efficiency of the gas compressor.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gas compressor manufactured by a method of manufacturing a gas compressor according to an embodiment.

FIG. 2 is a sectional view showing a positional relationship between a permanent magnet and a movable coil, and a graph showing a distribution of magnetic flux density by the permanent magnet.

FIG. 3 is a cross-sectional view of a piston-opposed gas compressor.

[Explanation of symbols]

 Reference Signs List 1 magnet yoke 2 cylinder 3 piston 5 compression chamber 6 through-hole 11 permanent magnet 13, 14 magnetic flux 17 movable coil 21A first space 21B second space 30 gas flow path 31 case 32 coil spring 33 recess 34, 36 external terminal 35, 37 Lead wire

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Kanao 63-30 Yuyugaoka, Hiratsuka-shi, Kanagawa Prefecture Sumitomo Heavy Industries Machinery Co., Ltd. Hiratsuka Works (72) Inventor Yoshito Taguchi 2-1-1 Tanitocho, Tanashi-shi, Tokyo 1 Sumitomo Heavy Industries, Ltd. Tanashi Works (72) Inventor Toshio Uchida 2-1-1 Tanidocho, Tanashi-shi, Tokyo Sumitomo Heavy Industries, Ltd. Tanashi Works (72) Inventor Tetsu Muranishi Kawasaki, Kanagawa Prefecture 2-1, 1-1 Oda Sakae, Kawasaki-ku Showa Electric Wire & Cable Co., Ltd. (72) Inventor Takeshi Moriyama 2-1-1, Oda Ei, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. F-1 term in Showa Electric Wire & Cable Co., Ltd. 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa 3H076 AA03 BB21 CC06 CC83

Claims (4)

[Claims] 1. A cylinder, a piston inserted into the cylinder and capable of reciprocating along an axis of the cylinder, magnetic flux generating means fixed to one of the cylinder and the piston, and a coil fixed to the other. Wherein the magnetic flux generating means defines first and second spaces arranged in the cylinder axis direction, generates mutually opposite magnetic fluxes in the first and second spaces, and the coil comprises A first portion disposed in the first space and a second portion disposed in the second space, and when current is applied to the first and second portions,
A method for manufacturing a gas compressor configured to generate Lorentz force in the same direction of a cylinder shaft, the method including: determining a stroke design value of the piston; When the coil is displaced by the design value, the end of the first portion of the coil on the second space side does not enter the second space, and
When the piston is displaced from the boundary of the second space by at least a first distance and the piston is displaced toward the first space by a stroke design value, the end of the second portion of the coil on the first space side Arranging the first and second portions of the coil such that they do not enter the first space and are separated from the boundary between the first and second spaces by the first distance or more. Manufacturing method of gas compressor. 2. The method according to claim 1, wherein the first distance is 1/10 of the stroke design value. 3. In the step of disposing the first and second portions of the coil, when the piston is displaced toward a second space by a stroke design value, the second portion of the first portion of the coil is displaced. When a space-side end approaches a boundary between the first and second spaces to a distance equal to or less than a second distance and the piston is displaced toward the first space by a stroke design value, a second portion of the coil is formed. The first and second portions of the coil are arranged such that an end of the first space side of the first coil approaches a boundary of the first and second spaces to a distance equal to or less than a second distance. 3. The method for manufacturing a gas compressor according to claim 1. 4. The method according to claim 3, wherein the second distance is 3/10 of the stroke design value.