JP2005048694A - Compressor and its transporting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a movable part and a trouble of a compressor, when operated, due to the residence of metal pieces generated upon damage in the compressor by suppressing the movement of the movable part with vibration or impact during transportation in a deenergized condition. <P>SOLUTION: The compressor 30 comprises a cylinder 2 having a cylindrical space, a piston 5 inserted into the cylinder 2 via a gap forming a clearance seal 15 to form a compression space 6 for operating gas in the cylindrical space, a supporting spring 8 consisting of plate springs for supporting the piston 5 in an axially reciprocative manner, a linear drive part for driving the reciprocation of the piston 5 in the axial direction, and a pressure container forming a gas chamber passing through the compression space 6 via the gap. The linear drive part is formed by a magnetic circuit consisting of a permanent magnet 14 having a cavity in which a driver coil 7 connected to the piston 5 is stored and a yoke 1. Short-circuit means 31, 32 are provided for electric short-circuit across the driver coil 7 during deenergization. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor used in a cryogenic refrigerator and the like and a method of transporting the compressor.

  FIG. 4 is a diagram showing a cross-sectional configuration and electrical wiring of a conventional compressor. FIG. 5 is a perspective view for supplementarily explaining the configuration of the compressor shown in FIG. 4. The compressor shown in these drawings forms a pressure vessel in which a cylindrical case 4 is fitted on the top and bottom of a cylinder 2 having a cylindrical space formed by a yoke 1 via a ring 3 to form a gas chamber. is doing. A piston 5 is inserted into the cylindrical space of the cylinder 2 from above and below so as to form a compression space 6, and the piston 5 is supported by a support spring 8 together with a driver coil 7 connected to the piston 5. Yes.

  The driver coil 7 is connected to current terminals 10, 11, 12, and 13 which are fixed by protruding from the inside of the case 4 to the outside by lead wires 9. A permanent magnet 14 is incorporated in the yoke 1, and a driver coil 7 is incorporated so as to move up and down so as to cross the magnetic flux generated by the permanent magnet 14.

  A clearance seal 15 formed by a gap is formed between the piston 5 and the cylinder 2, and is normally supported so that the piston 5 and the cylinder 2 do not come into contact with each other. Further, in the cylindrical pressure vessel, a gas flow path 16 is formed in the radial direction by a through hole that connects the compression space 6 and a cryogenic refrigerator (not shown).

  Further, a power source 20 for supplying an AC exciting current to the driver coil 7 is wired to each current terminal 10 to 13 via a switch 21. The switch 21 is supplied with AC excitation current from the power source 20 to the driver coil 7 when the mover 21a is connected to the terminal 21b, and is cut off when switched to the terminal 21c. It is like that.

  In the compressor having such a configuration, when the switch 21 is turned ON as shown in the figure, alternating current excitation currents having a phase difference of 180 degrees are supplied from the power source 20 to the driver coil 7, and the magnetic field and excitation current are supplied in the gap 17. The piston 5 together with the driver coil 7 reciprocates in the axial direction along the insertion direction of the piston 5 in the opposite directions to compress the working gas in the compression space 6. The wave of the working gas is given to an external cryogenic refrigerator via the gas flow path 16.

  The operation principle of such a compressor is well known, and by matching the drive frequency with the natural frequency determined by the spring constants such as the mass of the driver coil 7 and the piston 4 and the pressure of the support spring 8 and the working medium. , Efficient operation can be performed.

An example of this type of conventional compressor is described in Patent Document 1.
JP 2002-206479 A

  By the way, in the conventional compressor, the movable parts of both the piston 5 and the driver coil 7 are supported by the support spring 8 and easily maintained by maintaining a predetermined clearance with the wall surface of the yoke 1. It comes to move. For this reason, when a current is supplied to the driver coil 7, it is controlled by an electromagnetic circuit, so that the movable portion reciprocates in the axial direction within a predetermined range so as not to contact the wall surface of the yoke 1.

  Further, even when the switch 21 is turned off and no current is supplied, if the compressor is tilted or subjected to vibration or impact, the movable part easily moves, and the yoke 1 is moved. May come into contact with the inner wall of the. In order to prevent this, the above-described clearance is provided so as to serve as a stopper for avoiding contact between the movable portion and the wall surface of the yoke 1.

  However, when the compressor is transported, large vibrations and impacts are likely to occur, so that the movable part moves more greatly, resulting in strong contact with the wall surface of the yoke 1 and damage. There is a problem that it remains inside the compressor and may cause a failure when the compressor is operated.

  The present invention has been made in view of such problems, and by preventing movement of the movable part due to vibration or impact during transportation in a non-energized state, damage to the movable part is prevented, and It is an object of the present invention to provide a compressor and a method of transporting the compressor, which can prevent a failure during operation of the compressor due to the metal pieces at the time of damage remaining inside the compressor.

  To achieve the above object, a compressor according to claim 1 of the present invention is inserted through a cylinder having a cylindrical space and a gap forming a clearance seal in the cylinder, and compresses the working gas into the cylindrical space. A piston that forms a space; a support spring that includes a leaf spring that supports the piston in a reciprocating manner in the axial direction; a linear drive unit that drives the piston in a reciprocating manner in the axial direction; and the compression space through the gap. A pressure vessel that forms a gas chamber that communicates, and the linear drive unit is formed by a drive coil coupled to the piston, and a magnetic circuit comprising a permanent magnet and a yoke having a gap for housing the drive coil. The compressor is characterized by comprising short-circuit means for electrically short-circuiting both ends of the driver coil when no power is supplied.

  According to this configuration, since both ends of the driver coil are electrically short-circuited by the short-circuit means when no current is supplied, for example, vibration or impact is generated in the compressor, whereby the driver coil is axially moved together with the piston. When moving to, the exciting current flows according to the movement of the driver coil. When this exciting current flows, an electromagnetic force acts on the driver coil in the direction opposite to the previous movement direction, as is apparent from Fleming's law. Thus, the movement of the driver coil is suppressed by the electromagnetic force in the reverse direction. As a result, the movement of the driver coil due to vibration or impact is suppressed. Therefore, the movement of the piston connected to the driver coil is similarly suppressed.

  The compressor according to claim 2 of the present invention is the compressor according to claim 1, wherein the short-circuit means is a switch for switching energization / non-energization of the power to the driver coil when the driver is not energized. Both ends of the coil are electrically short-circuited, and the coil is incorporated so that the short-circuit is released when energized.

  According to this configuration, the same effect as that of the first aspect can be obtained, and since the short-circuit unit is incorporated in the switch of the power source, the short-circuit unit can be realized with a simpler configuration.

  According to a third aspect of the present invention, there is provided a method for transporting a compressor, wherein a cylinder having a cylindrical space and a clearance for forming a clearance seal are formed in the cylinder, and a compressed gas compression space is formed in the cylindrical space. A piston that performs reciprocating movement in the axial direction, a linear drive unit that reciprocates the piston in the axial direction, and a gas chamber that communicates with the compression space through the gap. A compression vessel formed by a drive coil coupled to the piston and a magnetic circuit comprising a permanent magnet and a yoke having a gap for receiving the drive coil. In the transport method of the machine, when the compressor is transported, after energizing the driver coil is turned off, both ends of the driver coil are electrically short-circuited. It is characterized in that it comprises that step.

  According to this method, when the compressor is transported, both ends of the non-energized driver coil are electrically short-circuited. When the driver coil moves in the axial direction together with the piston, an exciting current flows according to the movement of the driver coil. When this exciting current flows, an electromagnetic force acts on the driver coil in the direction opposite to the previous movement direction, as is apparent from Fleming's law. Thus, the movement of the driver coil is suppressed by the electromagnetic force in the reverse direction. As a result, the movement of the driver coil due to vibration or impact is suppressed. Therefore, the movement of the piston connected to the driver coil is similarly suppressed.

  As described above, the present invention provides a compressor having a piston inserted into a cylinder through a gap and a driver coil connected to reciprocate the piston in the axial direction when no power is supplied. Since a short-circuit means for electrically short-circuiting both ends of the coil is provided, for example, when a vibration or an impact occurs in the compressor, and the driver coil moves in the axial direction together with the piston, it responds to the movement of the driver coil. Excitation current flows. When this exciting current flows, an electromagnetic force acts on the driver coil in the direction opposite to the previous movement direction, as is apparent from Fleming's law. Thus, the movement of the driver coil is suppressed by the electromagnetic force in the reverse direction. As a result, the movement of the driver coil due to vibration or impact is suppressed. That is, the movement of the piston connected to the driver coil is similarly suppressed.

  Therefore, by suppressing the movement of the movable part due to vibration or impact during transportation in the non-energized state, the movable part is prevented from being damaged, and the metal piece at the time of the damage is compressed by remaining inside the compressor. There is an effect that it is possible to prevent a failure during operation of the machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a cross-sectional configuration and electrical wiring of a compressor according to a first embodiment of the present invention. However, in the first embodiment shown in FIG. 1, portions corresponding to the respective portions of the conventional example shown in FIG. 4 and FIG.

  The compressor 30 of the first embodiment shown in FIG. 1 is different from the conventional compressor in that a relay terminal 31 is connected between the switch 21 shown in FIG. 4 and the current terminals 10 to 13. In other words, the short-circuiting piece 32 is connected to the relay terminal 31 when the switch 21 is not energized and the both ends of the driver coil 7 are electrically short-circuited.

  The operations of the piston 5 and the driver coil 7 in the compressor 30 during this short circuit will be described with reference to the equivalent diagram of FIG. However, since the piston 5 moves together with the connected driver coil 7, the operation of the driver coil 7 will be described here as a representative.

  For example, when the compressor 30 is transported, the switch 21 is turned OFF and the wiring connection is disconnected from the power source 20. Thereafter, the short-circuit piece 32 is connected to the relay terminal 31 and both ends of the driver coil 7 are electrically short-circuited, and then the compressor 30 is transported.

  At this time, it is assumed that vibration or impact is generated in the compressor 30 and the driver coil 7 is moved in the axial direction indicated by the pair of arrows Y1. In this case, since both ends of the driver coil 7 are short-circuited by the short-circuit piece 32, an exciting current flows according to the movement of the driver coil 7. When this exciting current flows, an electromagnetic force acts on the driver coil 7 in the direction Y2 opposite to the previous moving direction Y1, as is apparent from Fleming's law. As a result, the movement of the driver coil 7 in the arrow Y1 direction is suppressed by the electromagnetic force in the arrow Y2 direction. As a result, the movement of the driver coil 7 due to vibration or impact is suppressed. Accordingly, the movement of the piston 5 connected to the driver coil 7 is similarly suppressed.

As described above, according to the compressor of the first embodiment, when carrying out in a non-energized state, short-circuiting both ends of the driver coil 7 with the short-circuiting piece 32 at the relay terminal 31, Since the movement of the movable part of the piston 5 and the driver coil 7 due to impact or the like can be suppressed, damage to the movable part can be prevented. Moreover, the failure at the time of the compressor operation | movement by the metal piece at the time of the damage remaining in the inside of the compressor 30 can be prevented.
(Second Embodiment)
FIG. 3 is an equivalent diagram for explaining the operation of the movable part of the compressor according to the second embodiment of the present invention. However, in the second embodiment shown in FIG. 3, portions corresponding to the respective portions of the first embodiment shown in FIG.

  The second embodiment is different from the conventional example in that a short-circuit piece 34 is connected to the terminal 21c on the power OFF side of the switch 21 shown in FIG. The switch 35 is configured.

  That is, both ends of the driver coil 7 are electrically short-circuited by turning off the switch 35.

  When the compressor 30 is transported in this configuration, the switch 30 is turned off and the wiring connection is disconnected from the power source 20 before the compressor 30 is transported. At this time, the operation of the driver coil 7 when vibration or impact occurs in the compressor 30 is the same as that of the first embodiment. That is, the movement of the driver coil 7 in the arrow Y1 direction is suppressed by the electromagnetic force in the arrow Y2 direction, and as a result, the movement of the driver coil 7 due to vibration or impact is suppressed.

  As described above, according to the compressor of the second embodiment, the piston 5 is caused by vibration or impact during transportation by short-circuiting both ends of the driver coil 7 with the switch 35 during transportation performed in a non-energized state. And since the movement of the movable part of the driver coil 7 can be suppressed, damage to the movable part can be prevented. Moreover, the failure at the time of the compressor operation | movement by the metal piece at the time of the damage remaining in the inside of the compressor 30 can be prevented.

  Moreover, since it is not necessary to provide the relay terminal 31 as compared with the first embodiment, a short circuit can be realized with a simpler configuration.

It is a figure showing the section composition and electric wiring of the compressor concerning a 1st embodiment of the present invention. It is an equivalent diagram for demonstrating operation | movement of the movable part of the compressor which concerns on the said 1st Embodiment. It is an equivalent diagram for demonstrating operation | movement of the movable part of the compressor which concerns on the 2nd Embodiment of this invention. It is a figure which shows the cross-sectional structure and electric wiring of the conventional compressor. It is a perspective view for explaining the composition of the conventional compressor auxiliary.

Explanation of symbols

1 yoke 2 cylinder 3 ring 4 case 5 piston 6 compression space 7 driver coil 8 support spring 9 lead wire 10, 11, 12, 13 current terminal 14 permanent magnet 15 clearance seal 16 gas flow path 20 power supply 21, 35 switch 21a Switch mover 21b Switch power supply ON side terminal 21c Switch power supply OFF side terminal 30 Compressor 31 Relay terminal 32, 34 Short-circuited piece Y1 Movement direction of driver coil due to vibration or impact when no current is applied Y2 Movement direction Direction of electromotive force generated according to the movement of Y1

Claims (3)

A cylinder having a cylindrical space, a piston which is inserted through a gap forming a clearance seal in the cylinder and forms a compression space for the working gas in the cylindrical space, and supports the piston in a reciprocating manner in the axial direction. A support spring composed of a leaf spring; a linear drive unit that reciprocally drives the piston in the axial direction; and a pressure vessel that forms a gas chamber that communicates with the compression space via the gap. In a compressor formed by a driver coil coupled to a piston, and a magnetic circuit composed of a permanent magnet having a gap for housing the driver coil and a yoke,
A compressor comprising a short-circuit means for electrically short-circuiting both ends of the driver coil when not energized. The short-circuit means is a switch that switches between energization / non-energization of the power to the driver coil, and both ends of the driver coil are electrically short-circuited when the switch is de-energized, and the short circuit is released when energized. The compressor according to claim 1, wherein the compressor is incorporated as follows. A cylinder having a cylindrical space, a piston which is inserted through a gap forming a clearance seal in the cylinder and forms a compression space for the working gas in the cylindrical space, and supports the piston in a reciprocating manner in the axial direction. A support spring composed of a leaf spring; a linear drive unit that reciprocally drives the piston in the axial direction; and a pressure vessel that forms a gas chamber that communicates with the compression space via the gap. In a method of transporting a compressor formed by a driver coil coupled to a piston, and a magnetic circuit composed of a permanent magnet having a gap for housing the driver coil and a yoke,
A method of transporting a compressor comprising the step of electrically short-circuiting both ends of the driver coil after the driver coil is energized when transporting the compressor.

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