JPH028155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a drive coil energized by alternating power is arranged in the gap between a permanent magnet and a pole piece, and a piston integrated with the coil is slidably loose in a cylinder part. so that the reciprocating motion caused by the magnetic force of the drive coil is amplified by the resonant coil spring,
The present invention relates to a vibratory compressor that suctions and discharges fluid by reciprocating the piston.

Conventionally, in this type of vibratory compressor, a single vibrating system consisting of a permanent magnet, a pole piece, a drive coil, a piston, a resonant coil spring, etc. is disposed within a casing to constitute a compressor body. Therefore, as a reaction to the reciprocating motion of the piston along the axial direction of the casing, it is unavoidable that vibrations occur in the compressor body along the axial direction. However, the container is supported by, for example, an electric refrigerator, which inevitably increases the size of the entire compressor. Furthermore, since the compressor body is covered with a container, the efficiency of cooling the heat generated inside the compressor body is poor. In order to further increase the capacity, it is necessary to increase the vibration energy by increasing the weight of vibrating bodies such as resonant coil springs and pistons, so the strength of each member must be improved to withstand the increased vibration energy. There is a need. In particular, in a resonant coil spring, in order to maintain a constant resonant frequency, the spring constant must be able to withstand large stress, and there is a limit to the increase in capacity due to the life of the spring itself.

The first object of the present invention is to solve such conventional technical problems, and to cover the casing by configuring a pair of vibration systems that vibrate in opposite directions within the casing to prevent vibration of the casing. To provide a vibratory compressor in which a container can be omitted, the cooling efficiency is improved, the whole is made compact, and the capacity can be easily increased.

A second object of the present invention is to provide a vibratory compressor which has a simplified structure by providing both cylinder parts in the axial center of the casing and forming a discharge valve chamber between the two cylinder parts via a discharge valve. It is to be.

A third object of the present invention is to provide a vibratory compressor that has a simplified structure by simplifying the electrical connection of the drive coil.

In the vibratory compressor according to the first invention, a pair of permanent magnets and a pair of pole pieces each forming an annular gap between the permanent magnets are housed in a cylindrical casing with both ends closed. , fixedly provided symmetrically with respect to the axial center portion of the casing, a pair of drive coils in which a pair of pistons are individually integrated and are energized by alternating power are disposed in each of the gaps, A pair of cylinder parts into which the piston is slidably and loosely fitted are integrally provided in the casing, and the two pairs of drive coils and the piston are floatingly supported by a resonant coil spring so as to be movable in the axial direction of the casing. The winding direction of each of the drive coils, the manner of electrical connection between each of the drive coils, and the magnetization direction of each of the permanent magnets are selected such that the moving directions of both of the drive coils are opposite to each other.

In the vibratory compressor according to the second aspect of the invention, a partition member that partitions the inside of the casing is fixed to the axial center of the casing, and a pair of cylinder parts into which a pair of pistons are slidably and loosely fitted in the partition member are arranged along the axis. They are provided identically, and a common discharge valve chamber is formed between both cylinder parts via a pair of discharge valves.

In the vibratory compressor according to the third invention, each drive coil is electrically connected in series, the winding direction of each drive coil is the same, and the magnetic poles of the permanent magnet on the side facing the corresponding drive coil are mutually opposite. Alternatively, the winding direction of each drive coil may be reversed so that the magnetic poles of the permanent magnets on the side facing the drive coil are the same.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. A pair of pistons 2 and 3 are disposed symmetrically with respect to the center, and these pistons 2 and 3 reciprocate in opposite directions by supplying alternating power to corresponding drive coils 4 and 5, respectively, and move fluid such as The refrigerant is sucked and discharged.

The casing 1 is constructed by fitting and fixing a pair of closing members 7 and 8 to both ends of a cylindrical body 6. Both of the closing members 7 and 8 are basically cylindrical and integrally provided with flanges 9 and 10 extending radially outward at each end, and these flanges 9 and 10 form a cylindrical body. 6
is fitted and fixed to both ends of the That is, thin-walled portions 11 and 12 are provided at both ends of the cylindrical body 6, and the flanges 9 and 10 of the respective closing members 7 and 8 are fitted into these thin-walled portions 11 and 12, respectively, so that the thin-walled portions 11 , 12 are caulked and bent as shown in the figure to construct the casing 1. In addition, by welding the caulked portions as described above, the fixation between the closing members 7 and 8 and the cylindrical body 6 is further ensured.

In this way, since the casing 1 is constructed by fitting and fixing the closing members 7 and 8 of the same shape to both ends of the cylindrical body 6, the structure of the casing 1 is extremely simplified and the assembly efficiency is improved.

In the central part in the axial direction inside the casing 1,
A partition member 13 basically shaped like a thick disk is fixed to the inner surface of the cylindrical body 6, thereby partitioning the inside of the casing 1 into a pair of low pressure chambers 14 and 15.

In both low pressure chambers 14 and 15, permanent magnets 16 and 17 are fixed in a ring shape on the inner surface of the cylindrical body 6 near both ends thereof, respectively. Also, both closing members 7, 8
There is an annular gap 1 between the permanent magnets 16 and 17.
8, 19 to form a ring-shaped pole piece 2
0 and 21 are fixed or integrally molded, respectively. Drive coils 4 and 5 are arranged in each gap 18 and 19 so as to be able to reciprocate in the axial direction of the casing 1, respectively. These drive coils 4, 5 are wound around support members 22, 23, respectively, and each support member 22, 23 is fixed to a cylindrical piston 2, 3 concentric with the axis of the casing 1, respectively.

One support member 22 has a base 24 that is basically disk-shaped and is fixed to the piston 2, and a base 24 that is fixed to the peripheral edge of the base 24 at intervals in the circumferential direction and extends parallel to the axis of the piston 2. It consists of a plurality of support parts 25, and a drive coil 4 is wound around one end of each support part 25. The other support member 23 has a base portion 26 and a support portion 27 and is formed in the same manner as the one support member 22. The drive coil 5 is wound around one end of the support portion 27, and the base portion 26 is connected to the piston 3. is fixed to. In this way, each drive coil 4, 5
and the corresponding pistons 2, 3 are substantially integrated.

Support parts 25 and 2 in each support member 22 and 23
Blade plates 28 and 29 are provided at the other ends of drive coils 4 and 5 at right angles to the moving direction of drive coils 4 and 5, respectively. These blade plates 28, 29 function to scatter lubricating oil into the respective low pressure chambers 14, 15 when the drive coils 4, 5 and the pistons 2, 3 integral therewith reciprocate.

Insulating plates 3 made of electrically insulating material are provided on the inner end surfaces of the closing members 7 and 8 at both ends of the casing 1.
A receiving plate 3 made of conductive material via 1 and 32
3 and 34 are brought into contact with each other. Further, on the surfaces of the bases 24 and 26 of each support member 22 and 23 facing the closing members 7 and 8, receiving plates 37 and 38 made of a conductive material are provided via insulating plates 35 and 36 made of an electrically insulating material. is brought into contact. Resonant coil springs 39, 40 are interposed between the receiving plates 33, 37 and 34, 38 facing each other, respectively.

On the surfaces of the bases 24 and 26 of the support members 22 and 23 facing the partition member 13, receiving plates 43 and 44 made of a conductive material are abutted, respectively, via insulating plates 41 and 42 made of an electrically insulating material. On both sides of the partition member 13, receiving plates 47 and 48 made of a conductive material are abutted, respectively, via insulating plates 45 and 46 made of an electrically insulating material. Resonant coil springs 49 and 50 are interposed between the receiving plates 43 and 47 and 44 and 48 that face each other, respectively.

In this way, the reciprocating motion of the drive coil 4 is amplified by the pair of resonant coil springs 39, 49, and the reciprocating motion of the drive coil 5 is amplified by the pair of resonant coil springs 40, 50. The pistons 2 and 3, which make an amplified reciprocating motion together with the drive coils 4 and 5, are slidably and loosely fitted into cylinder portions 51 and 52 that are integrally provided to the partition member 13, respectively.

Referring also to FIG. 2, the partition member 13 includes:
A through hole 53 concentric with the casing 1 is bored, and by fitting a pair of cylindrical cylinder bodies 54 and 55 from both ends into the through hole 53, both low pressure chambers 14 and 15 of the partition member 13 are connected. Cylinder portions 51 and 52 are each integrally provided in the facing portion. That is, in the middle of the through hole 53, there are two undercut stepped portions 5 facing outward in the axial direction.
6 and 57 are formed respectively, and a metal flow material 58 and 59 such as lead or copper is applied to these stepped portions 56 and 57 to form a cylindrical cylinder body 5.
4 and 55 are press-fitted into the through hole 53. As a result, the metal flow materials 58 and 59
6, 57 and an undercut stepped portion formed on the outer periphery of each cylinder body 54, 55,
Metal flow materials 58 and 59 flow between the outer circumferential surfaces of the cylinder bodies 54 and 55 and the inner circumferential surface of the through hole 53, respectively, to perform fixing and sealing functions.

Annular notches 60 and 61 are formed on the outer peripheries of mutually opposing ends of the cylinder bodies 54 and 55, respectively. A substantially cylindrical liner 62 is inserted therein. In this way, a discharge valve chamber 63 is provided between the ends of both cylinder bodies 54 and 55.
is commonly formed in both cylinder parts 51 and 52.
In this discharge valve chamber 63, each cylinder body 54, 55 is provided.
A pair of discharge valves 66 and 67 which can be seated on valve seats 64 and 65 respectively formed on the end faces of the valve and which are guided by the liner 62; , 67 to the corresponding valve seat 6
A pressing coil spring 68 that urges the coils 4 and 65 is housed therein.

In the discharge valve chamber 63, each discharge valve 66, 67
In this case, the corresponding pistons 2 and 3 are the cylinder parts 51,
When the pistons 52 move outward in the cylinder chambers 69, 70 to perform a suction operation, they are seated on the valve seats 64, 65 by the spring force of the pressing coil spring 68 and closed; 3 is the cylinder chamber 69, 70
When the valve moves inward within the cylinder to perform a discharge operation, the valve opens by separating from the valve seats 64 and 65 against the spring force of the pressing coil spring 68, thereby communicating the cylinder chambers 69 and 70 with the discharge valve chamber 63. let

On the other hand, at the tips of the pistons 2 and 3 in each cylinder chamber 69 and 70, communication holes 71 and 72 are provided at the bottom.
Holding members 73 and 74 each having a cylindrical shape with a bottom are provided with suction valve chambers 75 and 7 between the tips of each piston 2 and 3.
6 and are fixed to each other. In these suction valve chambers 75 and 76, suction valves 79 and 80 that can be seated on valve seats 77 and 78 formed on the tip surfaces of each piston 2 and 3 are movable in the axial direction of the pistons 2 and 3. Each is retained.

In each suction valve chamber 75, 76, the piston 2,
3 moves outward in the cylinder chambers 69, 70 to perform a suction operation, the suction valves 79, 80 close to the valve seats 7.
7, 78 to communicate the inside of the pistons 2, 3 with the suction valve chambers 75, 76, and therefore the suction valve chambers 7
The insides of the pistons 2 and 3 are communicated with the cylinder chambers 69 and 70 through the pistons 5 and 76 and the communication holes 71 and 72. On the contrary, when the pistons 2, 3 move inward within the cylinder chambers 69, 70 and perform a discharge operation, the suction valves 79, 80 are seated on the valve seats 77, 78 and closed.

Furthermore, with reference to FIG. 3, the partition member 13
A hole 81 that opens laterally is bored in the side of the cylinder 6. When the partition member 13 is fixed to the inner surface of the cylindrical body 6, the hole 81 is closed by the inner surface of the cylindrical body 6 and the suction chamber is closed. Form 82. An oil-impregnable porous metal or wire mesh 83 is inserted into the suction chamber 82 . Further, a suction pipe 84 is connected to the cylindrical body 6 so as to communicate with a suction chamber 82 .
4, a small amount of lubricating oil is sucked into the suction chamber 82 along with a fluid such as a solvent for an electric refrigerator. The partition member 13 is provided with a pair of suction holes 85 and 86 that open near the bottom of the suction chamber 82 and communicate with the low pressure chambers 14 and 15 on both sides of the partition member 13, respectively. Therefore, the sucked fluid is distributed from the suction chamber 82 to the suction holes 85, 86 and flows into the low pressure chambers 14, 15, respectively. Further, the lubricating oil introduced into the suction chamber 82 diffuses into the porous metal or wire mesh 83 by capillary action, and is further accompanied by the fluid from the suction holes 85, 86 to the low pressure chambers 14, 1.
It is divided into 5. Such lubricating oil is used in each low pressure chamber 1.
4, 15, the pistons 2, 3 and the inner surfaces of the cylinder chambers 69, 70 are lubricated. In addition, the lubricating oil diffused and contained in the porous metal and the wire mesh 83 becomes atomized when it is entrained in the fluid, so that it is uniformly distributed and supplied to the outer surfaces of the pistons 2 and 3. Furthermore, since the fluid sucked into the suction chamber 82 from the suction pipe 84 expands within the suction chamber 82, suction noise is effectively reduced. Therefore, the suction chamber 82 has a function as a lubricating oil distributor and a muffler.

Discharge valve chamber 6 of through hole 53 in partition member 13
An annular groove 87 is formed on the inner surface corresponding to No. 3.
On the other hand, the liner 62 has a slit 88 formed in a part of the circumferential direction over the entire length in the axial direction, and the cross section perpendicular to the axis is formed in an arc shape with a center angle of nearly 360 degrees. Therefore, no matter how the liner 62 is arranged within the through hole 53, the discharge valve chamber 63 and the annular groove 87 will always communicate with each other. The material of the liner 62 is required to be hard and have excellent wear resistance in order to guide the discharge valves 66 and 67. However, as described above, the slit 88 is formed and the annular groove 87 is formed in the partition member 13. By forming a hole in the liner for guiding the fluid from the discharge valve chamber 63, the complicated work of arranging the liner so that the hole corresponds to the discharge hole bored in the partition member 13 is eliminated. Become.

Referring again to FIG. 2, the partition member 13 is provided with a small diameter discharge hole 90 which communicates with the annular groove 87 at one end and communicates with the high pressure chamber 89 at the other end. The high pressure chamber 89 is formed by closing a hole 91 opened toward the right low pressure chamber 15 and bored in the partition member 13 parallel to the axis of the casing 1 with a lid member 92 .
The lid member 92 is basically in the shape of a thick disk, and is press-fitted into the hole 91 with a metal flow material 93 interposed between it and the undercut stepped portion of the hole 91 .

The fluid flowing into the high pressure chamber 89 from the discharge valve chamber 63 through the slit 88, the annular groove 87 and the discharge hole 90 expands as it flows into the high pressure chamber 89 from the small diameter discharge hole 90, thereby causing discharge noise. reduced.

One end of a discharge pipe 94 that communicates with the high pressure chamber 89 is connected to a lid member 92 that closes the high pressure chamber 89, and this discharge pipe 94 extends through the right side low pressure chamber 15 along the inner surface of the cylindrical body 6. It is drawn out through a guide tube 95 provided in the closing member 8 and connected to a condenser of an electric refrigerator or the like. After the guide tube 95 is inserted into the through hole 96 formed in the closing member 8,
One end 97 of the closing member 8 is welded by brazing.
It is fixed around the entire circumference. In addition, the low pressure chamber 15
Since it is necessary to keep the guide tube 95 airtight, the other end 98 of the guide tube 95 and the discharge tube 94 are also fixed over the entire circumference by brazing welding.

However, the position where the guide tube 95 is provided is close to the permanent magnet 17, as is clear from FIG. Therefore, if one end 97 of the guide tube 95 is brazed and welded to the closing member 8 after the closing member 8 is fitted and fixed to the cylindrical body 6, the heat generated by the brazing welding will pass through the closing member 8 and the cylindrical body 6. The heat is transmitted to the permanent magnet 17 and has a thermal influence on the permanent magnet 17. Therefore, one end 97 of the guide tube 95 is inserted into the through hole 96 and brazed welded before the closing member 8 is fitted and fixed to the cylindrical body 6. Next, the discharge pipe 9 is inserted into the guide pipe 95.
After fitting and fixing the closing member 8 to the cylindrical body 6 while inserting the other end 98 of the guide tube 95 and the discharge tube 94
Braze and weld. At this time, the other end 98 of the guide tube 95 is in a position away from the permanent magnet 17, so that the heat effect due to brazing welding is not applied to the permanent magnet 17.
It will never reach.

Both ends of the casing 1, that is, both closing members 7,
8, sealing terminals 101 and 102 are inserted and fixed for connecting the socket connection terminals 99 and 100 while keeping the insides of the respective low pressure chambers 14 and 15 airtight. In other words, through holes 103 and 104 concentric with the cylindrical body 6 are bored in both of the closing members 7 and 8, and a step formed in the middle of these through holes 103 and 104 faces inward of the casing 1. Sealed terminals 101, 10 are attached to circular bent edges 107, 108 of portions 105, 106.
2 are fixed together by projection welding.

The sealed terminal 101 has a cylindrical part 109 and a conical part 110.
and a holding frame 111 made of a conductive material,
It is constructed by holding a terminal rod 113 concentrically through a non-conductive material such as a glass body 112. This sealed terminal 101 is connected to the conical portion 11 of the holding frame 111.
Projection welding is performed by creating a potential difference between the closing member 7 and the holding frame 111 while the outer surface of the closing member 7 is in line contact with the bent edge 107 over the entire circumference. At this time, the outer circumferential surface of the cylindrical portion 109 in the holding frame 111 and the inner circumferential surface of the through hole 103 are close to each other, and there is a possibility that projection welding at the bent edge 107 may be inhibited. Therefore, when inserting the sealed terminal 101 into the through hole 103, a cylindrical insulator 114 made of an electrically insulating material is interposed between the outer peripheral surface of the cylindrical portion 109 and the inner peripheral surface of the through hole 103. This ensures that the conical portion 110 of the sealed terminal 101 is projection-welded at the line contact portion with the bent edge 107.
In this way, the airtightness of the low pressure chamber 14 is maintained.

Moreover, the terminal rod 113 of the sealed terminal 101 passes through the insulating plate 31 and is fitted into the cylindrical connecting member 115 fixed to the receiving plate 33. Thereby, the terminal bar 113 is electrically connected to the receiving plate 33 via the connecting member 115.

The other sealed terminal 102 is the sealed terminal 10 described above.
1, a holding frame 118 consisting of a cylindrical part 116 and a conical part 117 holds a terminal rod 120 through a glass body 119, and a cylindrical insulator is provided between the cylindrical part 116 and the inner surface of the through hole 104. With the body 121 interposed, the bent edge 108 and the conical portion 117 are fixed by projection welding, and the terminal rod 12
0 is inserted into the cylindrical connecting member 136. In this way, the middle portions of the through holes 103 and 104 are hermetically closed by the sealed terminals 101 and 102.
From those sealed terminals 101 and 102 to the terminal bar 11
3,120 are respectively projected. These terminal bars 113, 120 have socket connection terminals 99,
100 are fitted respectively.

The socket connection terminals 99, 100 are formed by covering female terminal portions 122, 123 for receiving the terminal rods 113, 120 with insulating layers 124, 125 made of an electrically insulating material, such as synthetic resin,
On the outer surface of each insulating layer 124, 125, a plurality of retaining pawls 128, 129 are provided around the periphery, which are inclined radially outward from the open end portion and have step portions 126, 127 formed at the rear end. The holes are drilled at intervals in the direction. On the other hand, in the middle of the through holes 103 and 104 in the closing members 7 and 8, a locking surface that faces each sealed terminal 101 and 102 and forms a step is formed at a position spaced apart from the sealed terminal 101 and 102 in the axial direction. 130 and 131 are formed, respectively.

Each socket connection terminal 99, 100 is inserted into the through hole 103, 1 while bending the retaining claw 128, 129.
04, whereby the female terminal portion 12
The terminal rods 113 and 120 are inserted into the terminals 2 and 123 to be electrically connected. At this time, each retaining claw 12
8 and 129 are engaged with the locking surfaces 130 and 131, respectively, so that the socket connection terminals 99 and 10
0 is prevented from escaping from the through holes 103 and 104.

An AC power supply 132 and a switch 133 are connected in series between the socket connection terminals 99 and 100. Further, an insertion hole 134 is formed in the partition member 13 in parallel with the axis of the casing 1, and a covered connection wire 135 connecting the receiving plates 47 and 48 is inserted through the insertion hole 134. Further, the receiving plate 37 is connected to one end of the driving coil 4, the other end of the driving coil 4 is connected to the receiving plate 43, the receiving plate 44 is connected to one end of the driving coil 5, and the other end of the driving coil 5 is connected to the receiving plate 43, and the other end of the driving coil 5 is connected to the receiving plate 43. Connected to plate 38.

In this way, the AC power supply 132 is connected to the female terminal portion 122, the terminal bar 113, the connecting member 115, the receiving plate 33, the resonant coil spring 39, the receiving plate 37, the drive coil 4, the receiving plate 43, the resonant coil spring 49, and the receiving plate. 47, covered connection wire 135, receiving plate 48, resonant coil spring 50, receiving plate 44, drive coil 5, receiving plate 38, resonant coil spring 40, receiving plate 34, connection member 136, terminal bar 120, female terminal part 12
An electrical closed circuit is formed which returns to the AC power supply 132 via the switch 133 and the switch 133 in sequence.

Here, the magnetization directions of the permanent magnets 16 and 17 will be explained as shown in FIG. 4. That is, if the inner surface of the permanent magnet 16 corresponding to one drive coil 4 facing the drive coil 4 is the N pole, the inner surface of the permanent magnet 17 corresponding to the other drive coil 5 facing the drive coil 5 is the S pole. It is considered to be extreme. On the contrary, the inner surface of the permanent magnet 16 may be the S pole and the inner surface of the permanent magnet 17 may be the N pole. In either case, the magnetization directions of both the permanent magnets 16 and 17 are opposite to each other, and The driving coils 4 and 5 are wound in the same direction.

In this way, when the switch 133 is turned on and an alternating current flows through both drive coils 4 and 5, magnetic forces in the drive coils 4 and 5 approach each other as shown by solid line arrows during a half cycle of the alternating current. F acts,
In the next half cycle, magnetic forces F act on both drive coils 4 and 5 in directions that separate them from each other as indicated by broken line arrows. In this way, by energizing both the drive coils 4 and 5 connected in series with alternating power, the drive coil 4, the piston 2, and the drive coil 5
and the piston 3 reciprocate in opposite directions.

Next, the operation of this embodiment will be explained. By turning on the switch 133 and energizing the drive coils 4 and 5 with alternating power, the pistons 2 and 3 reciprocate in opposite directions to suck fluid. , performs the discharge action. At this time, the directions of movement of both pistons 2 and 3 are opposite to each other, but when one is performing a discharge action, the other is also performing a discharge action.
Since the directions of vibration caused by the motion of the pistons 2 and 3 are opposite to each other, the vibrations cancel each other out. Therefore, the vibrations exerted on the casing 1 become extremely small, making it possible to attach the casing 1 directly to an electric refrigerator, etc., which was conventionally necessary to prevent the vibrations of the casing from being exerted on the outside. The container can be omitted, making it possible to downsize. There is also the advantage that the casing 1 can be directly cooled by outside air. Furthermore, since the vibration system is divided into two, it is possible to increase the capacity by combining two vibration systems with relatively small capacities, and it is possible to extend the life of the resonant coil springs 39, 40, 49, and 50.

The fluid sucked into the suction chamber 82 from the suction pipe 84 by the movement of both pistons 2 and 3 in mutually opposite directions has its suction noise reduced by the silencing effect caused by the expansion in the suction chamber 82, and is distributed to the suction holes 85 and 86. and introduced into both low pressure chambers 14 and 15. Both low pressure inside 1
Lubricating oil 137 accompanying the fluid introduced from the suction chamber 82 is stored in the lower part of the support members 22, 23.
The particles are scattered into the low pressure chambers 14 and 15 by blade plates 28 and 29 that reciprocate together with the particles. This scattered lubricating oil uniformly adheres to the outer surfaces of the pistons 2, 3, thereby achieving a lubricating effect between the pistons 2, 3 and the inner surfaces of the cylinder chambers 69, 70, and smoothing the movement of both pistons 2, 3. Good exercise is maintained.

The fluid in the low pressure chambers 14, 15 is connected to the pistons 2, 3
During the suction movement of the pistons 2 and 3 and the suction valve 7
It is introduced into the cylinder chambers 69, 70 through the pistons 9, 80, and further into the discharge valve chamber 63 through the discharge valves 66, 67 during the discharge movement of the pistons 2, 3. When the fluid discharged into the discharge valve chamber 63 flows into the high pressure chamber 89 through the discharge hole 90, it expands, its discharge noise is reduced, and is further led to a condenser of an electric refrigerator or the like through a discharge pipe 94.

As another embodiment of the present invention, as shown in FIG. 5, the permanent magnets 16 and 17 may be magnetized in the same direction, and the driving coils 4 and 5 may be wound in opposite directions. Even in this case, the magnetic force F is applied to the drive coils 4 and 5 in the direction shown by the solid line arrow in the direction of mutual proximity in the half cycle of the alternating current, and in the next half cycle the magnetic force F is applied to the drive coils 4 and 5 so that they approach each other as shown in the broken line arrow. A magnetic force F in the opposite direction can be applied to.

As described above, according to the first invention, since the pair of pistons are reciprocated in opposite directions within the casing with both ends closed, the vibrations caused by the reciprocating motion of the pistons are mutually canceled out. Therefore, the casing can be supported by a support without being covered with a container, and the heat generated within the casing can be cooled with outside air, making it possible to reduce the overall size. Furthermore, since the two sets of pistons and drive coils are each supported in a floating manner by the resonant coil springs, each resonant coil spring has sufficient strength, making it easy to increase the capacity.

Further, according to the second invention, the inside of the casing is partitioned by a partition member in the axial center of the casing,
The partition member is provided with a pair of cylinder portions into which the piston is slidably and loosely fitted, and a common discharge valve chamber is formed between the cylinder portions via a discharge valve. In addition to this effect, the structure can be extremely simplified.

Furthermore, according to the third invention, since both drive coils are electrically connected in series, in addition to the effects of the first invention, the same current can be passed through both drive coils without providing any special means. This makes it possible to reciprocate both drive coils using the same magnetic force, simplifying the structure.

[Brief explanation of drawings]

The drawings show embodiments of the present invention.
2 is an enlarged vertical sectional view showing the partition member 13 and its vicinity in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. 2. FIG. 4 is a circuit diagram schematically showing the magnetization direction of the permanent magnets 16, 17 and the winding direction of the drive coils 4, 5 in FIG. 1, and FIG. 17 is a simplified circuit diagram showing the magnetization direction of the drive coil 17 and the winding direction of the drive coils 4 and 5. FIG. 1...Casing, 2, 3...Piston, 4,
5... Drive coil, 16, 17... Permanent magnet, 1
8, 19... Gap, 20, 21... Pole piece, 39, 40, 49, 50... Resonance coil spring, 51, 52... Cylinder part, 63... Discharge valve chamber, 66, 67... Discharge valve .

Claims (1)

[Scope of Claims] 1 A pair of permanent magnets and a pair of pole pieces each forming an annular gap between the permanent magnets are arranged in a cylindrical casing with both ends closed. A pair of drive coils each individually integrated with a pair of pistons and energized by alternating electric power are disposed in each gap, and each of the pistons A pair of cylinder portions into which the cylinder portions are slidably and loosely fitted are integrally provided in the casing, and the two pairs of drive coils and pistons are floatingly supported by resonant coil springs so as to be movable in the axial direction of the casing, The winding direction of each of the drive coils, the manner of electrical connection between each of the drive coils, and the magnetization direction of each of the permanent magnets are selected such that the moving directions of both of the drive coils are opposite to each other. Vibratory compressor. 2 A pair of permanent magnets and a pair of pole pieces each forming an annular gap between the permanent magnets are placed in a cylindrical casing with both ends closed at the axial center of the casing. A pair of drive coils are disposed symmetrically and fixedly with respect to a partition member fixed to partition the inside of the casing, and each gap is provided with a pair of drive coils in which a pair of pistons are individually integrated and are energized by alternating power. The partition member is provided with a pair of cylinder parts having the same axis and into which each of the pistons is slidably and loosely fitted, and a common discharge valve is connected between the two cylinder parts via a pair of discharge valves. A chamber is formed, two pairs of drive coils and a piston are floatingly supported by a resonant coil spring so as to be movable in the axial direction of the casing, the winding direction of each of the drive coils, the electrical connection mode of each of the drive coils, and a vibratory compressor, wherein the magnetization direction of each of the permanent magnets is selected such that the moving directions of both the drive coils are opposite to each other. 3 A pair of permanent magnets and a pair of pole pieces each forming an annular gap between the permanent magnets are disposed in a cylindrical casing with both ends closed, with respect to the axial center portion of the casing. A pair of driving coils are disposed symmetrically and fixedly in each gap, each of which is individually integrated with a pair of pistons and is energized by alternating electric power. A pair of cylinder parts to be fitted are integrally provided in the casing, two pairs of driving coils and a piston are supported in a floating manner so as to be movable in the axial direction of the casing, and each of the driving coils is electrically connected in series. and further, the winding direction of each drive coil is the same and the magnetic poles of the respective permanent magnets on the side facing the corresponding drive coil are mutually opposite, or the winding direction of each drive coil is mutually reversed. A vibratory compressor characterized in that the magnetic poles of each of the permanent magnets on the side facing the drive coil are the same.