JP3934591B2 - Linear compressor - Google Patents

Description

  The present invention relates to a linear compressor, and more particularly to a linear compressor that prevents a collision between a compression portion and an inner surface of a casing and improves reliability and stability.

  As shown in FIG. 4, the conventional linear compressor includes a sealed outer casing 105 and a compression unit 111 that is driven by a drive unit 131 in the casing 105 to suck, compress, and discharge refrigerant. ing.

  The compression unit 111 supports the lower end of the outer core 137 of the drive unit 131 and forms a compression chamber 113, a piston 121 installed so as to reciprocate in the compression chamber 113, and the cylinder block 115. And a cylinder head 123 having a valve part (not shown) provided with a suction valve (not shown) for sucking refrigerant and a discharge valve (not shown) for discharging refrigerant.

  The drive unit 131 includes an inner core 133 provided on the outer side of the cylinder block 115, an outer core 137 that surrounds the outer week surface of the inner core 133 at a predetermined interval, and in which an inner coil 135 is wound annularly. A magnet 141 provided between the inner core 133 and the outer core 137 and electromagnetically interacting with the magnetic fields of the inner core 133 and the outer core 137 to reciprocate up and down, and between the inner core 133 and the cylinder block 115. And an inner core support part 134 provided on the cylinder block 115 to support the inner core 133.

  A fixed frame 145 and a cylinder block 115 that support the outer core 137 are provided at the upper end and the lower end of the outer core 137, respectively.

  The outer core 137 is laminated with many core strong plates, and the laminated core strong plates are a plurality of cores arranged at predetermined intervals at positions separated from the outer peripheral surface of the outer core 137. The fastening frame 145 and the cylinder block 115 are connected by a fastening bolt 143.

A movable element 151 that fixes and supports a magnet 141 provided in one region between the inner core 133 and the outer core 137 of the drive unit 131 is coupled to the upper end of the piston 121 of the compression unit 111. The movable element 151 is interlocked with the above-described vertical reciprocation of the magnet 141, whereby the piston 122 performs the vertical reciprocation within the compression chamber 113.
A resonance spring 153 that doubles the reciprocating motion of the piston 121 is provided in the upper region of the mover 151 and the fixed frame 145.

  However, in such a conventional linear compressor, the lower side of the compression part 111 is supported by the casing 105 by the support spring 108 interposed between the lower side of the cylinder block 115 and the bottom part inside the casing 105. Since the upper side of the compression unit 111 can be freely changed, a part of the compression unit 111, that is, the fixed frame 145 and the resonance spring 153 collide with the inner wall of the casing 105 when the linear compressor is operated. There is a problem and this reduces the reliability and stability of the linear compressor.

  Such a problem can also occur in the production process and transportation process of a conventional linear compressor.

  In order to solve the above-described problems, an object of the present invention is to provide a linear compressor that is improved in reliability and stability by preventing a collision between a compression portion and an inner surface of a casing.

  To achieve the above object, the present invention provides a casing, a drive unit provided in the casing, a compression unit that is driven by the drive unit to compress refrigerant, and elastically supports the compression unit. A linear spring having a support spring; a restriction protrusion formed on one of the compression part and the ceiling part of the casing; and a restriction protrusion provided on the other one of the restriction protrusion and the predetermined protrusion. It includes a stopper that is accommodated so as to be able to vary within a variation range.

  In addition, the compression unit is provided in the casing to form a compression chamber, a piston installed so as to reciprocate in the compression chamber, and a piston connected to the piston together with the piston. It is preferable to include a mover that reciprocates and a resonance spring that is disposed above the mover and doubles the reciprocation of the piston and the mover.

  On the other hand, it further includes a support member coupled to the upper part of the resonance spring, and the limiting protrusion is formed to protrude upward toward the zenith inside the casing at the upper part of the supporting member, and the stopper is the limiting protrusion. Can be provided at the zenith inside the casing.

  On the other hand, it further includes a support member coupled to the upper part of the resonance spring, wherein the limiting projection is formed to project downward toward the support member at the top of the casing, and the stopper accommodates the limiting projection It can be formed on the upper part of the support member.

  The support member may have a coupling portion that extends radially downward from a central portion and couples with an upper portion of the resonance spring.

  In addition, a through hole may be formed in the restriction protrusion along the vertical direction.

  As described above, according to the present invention, it is possible to provide a linear compressor that prevents the compression portion and the inner surface of the casing from colliding and has improved reliability and stability.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of a linear compressor according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. As shown in FIGS. 1 and 2, the linear compressor according to the present invention includes a sealed outer casing 5 and a compression unit 11 that is driven by a drive unit 31 in the casing 5 to suck, compress, and discharge refrigerant. Is composed of.

  The compression unit 11 supports the lower end of the outer core 37 of the drive unit 31, the cylinder block 15 that forms the compression chamber 13, the piston 21 that is provided so as to reciprocate in the compression chamber 13, and the cylinder block 15 And a cylinder head 23 having a valve portion (not shown) provided with a suction valve (not shown) for sucking refrigerant and a discharge valve (not shown) for discharging refrigerant.

  The drive unit 31 includes an inner core 33 provided on the outer side of the cylinder block 15, an outer core 37 that surrounds the outer peripheral surface of the inner core 33 at a predetermined interval, and an annular coil 35 is wound inside the inner core 33. 33 provided between the inner core 33 and the cylinder block 15, and provided between the inner core 33 and the cylinder block 15. The magnet 41 is provided between the inner core 33 and the outer core 37. And an inner support portion 34 that supports the inner core 33 and is provided on the cylinder block 15.

  A fixed frame 45 and a cylinder block 15 that support the outer core 37 are provided at the upper and lower ends of the outer core 37.

The outer core 37 is laminated on many core strong plates, and the laminated core strong plates are a plurality of core fastening members arranged at predetermined intervals at positions separated from the outer peripheral surface of the outer core 37. The bolt 43 is connected to the fixed frame 45 and the cylinder block 15.
A movable element 51 is coupled to the upper end of the piston 21 of the compression unit 11 and supports a magnet 41 that is provided at a predetermined interval between the inner core 133 and the outer core 37 of the drive unit 31. . The mover 51 is interlocked with the reciprocating motion of the magnet 41 described above, whereby the piston 21 reciprocates vertically within the compression chamber 13.

  A plurality of resonance springs 53 for doubling the vertical reciprocation of the piston 21 are stacked by bolts 37 in the upper regions of the mover 51 and the fixed frame 45. A spring spacer (not shown) is interposed between the plurality of resonance springs 53. The resonance spring 53 and the upper end of the mover 51 are coupled by a fixed shaft 59.

Between the resonance spring 53 and the zenith part inside the casing 5, support means for supporting the compression part 11 is provided so that the compression part 11 does not collide with the inner wall of the casing 5.
The support means is coupled to the upper portion of the resonance spring 53 and has a support portion 60 on which a limiting projection 61 is formed, a stopper 70 provided on the top of the casing 5 and accommodating the limiting projection 61 of the support member 60, including.

  The support member 60 is protruded from the upper part of the central region toward the inner zenith of the casing 5, and the support member 60 is radially extended around the limit protrusion 61, and the upper part of the resonance spring 53 and the coupling bolt. A plurality of, for example, three coupling portions 63 coupled by 64 are provided.

  The limiting protrusion 61 is formed with a through-hole 62 formed so as to penetrate in the vertical direction. The fixed shaft 59 is passed through the through-hole 62 when the movable element 51 and the resonance spring 53 are fastened. Work can be performed smoothly.

  The stopper 70 that accommodates the limiting protrusion 61 is provided at the top of the casing 5 facing the limiting protrusion 61, and is opened downward so that the limiting protrusion 61 can be received. As a result, the stopper 70 is accommodated so that the limiting projection 61 can be varied within a predetermined variation range a.

With such a configuration, when a power source is applied to the coil 35 that is annularly wound inside the outer core 37, the magnetic flux induced from this interacts with the magnetic field generated by the magnet 41 connected to the mover 51, The piston 21 is reciprocated in the vertical direction. When the piston 21 reciprocates up and down, the cooling performance required for the refrigerant sucked into the compression chamber 13 through the suction valve of the valve portion through the compression process and continuously discharged into the protruding valve of the valve portion is obtained. Can play. At this time, the mass of the piston 21 and the natural frequency of the resonance spring 53 are set to values substantially corresponding to the frequency of the applied power source, so that a large driving force by resonance can be obtained.
As described above, the linear compressor according to the present invention is housed in such a manner that the limiting protrusion 61 of the support member 60 to which the resonance spring 53 is coupled can be changed by the stopper 70 provided at the zenith portion inside the casing 5. Since the variation width on the upper side of the compression portion 11 is limited to a predetermined variation range a by the coupling of the restriction protrusion 61, the fixed frame 45 and the resonance spring 53 of the compression portion 11 are collided with the inner wall of the casing 5 and are damaged. Can be prevented.
On the other hand, in the first embodiment described above, the limiting protrusion 61 is formed on the support member 60, and the stopper 70 is formed at the zenith inside the casing 5 so as to correspond to the limiting protrusion 61, and the casing 5. The limiting projection 61 of the support member 60 is accommodated in a stopper 70 at the inner zenith portion so that the support member 60 can fluctuate. However, as shown in FIG. Limiting projections 80 are formed so as to project downward toward the top, and stoppers 91 for accommodating the limiting projections 80 are formed on the upper side of the support member 90. The limiting projections 80 at the zenith portion inside the casing are formed on the stoppers 91. It can be limited so that it can vary within a predetermined variation range a.

  As mentioned above, although preferred embodiment concerning this invention was described, this invention is not limited to this structure. A person skilled in the art can assume various modifications and changes within the scope of the technical idea described in the claims, and the technical scope of the present invention also relates to these modifications and changes. It is understood that it is included in

It is a longitudinal cross-sectional view of the linear compressor by 1st Embodiment of this invention. It is sectional drawing by the II-II line of FIG. It is a longitudinal cross-sectional view of the linear compressor by 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the conventional linear compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear compressor 5 Casing 8 Support spring 11 Compression part 13 Compression chamber 15 Cylinder block 23 Cylinder head 33 Inner core 34 Inner core support part 35 Coil 37 Outer core 41 Magnet 43 Fastening bolt 45 Fixed frame 51 Movable element 53 Resonant spring 57 Bolt 59 Fixed shaft 60 Support member 61 Limit projection 62 Through hole 63 Coupling part 64 Coupling bolt 70 Stopper

Claims (5)

A casing,
A drive provided in the casing;
A compression unit driven by the drive unit to compress the refrigerant;
In a linear compressor having a support spring that elastically supports the compression unit,
A restricting protrusion formed to protrude from any one of the compression part and the ceiling part of the casing;
It is seen containing a stopper for accommodating the restriction projection provided in the other one so that it can be varied within a predetermined variation range, and
The restriction projection, the linear compressor characterized that you through hole along the vertical direction is formed. The compression unit is
A cylinder block provided in the casing to form a compression chamber;
A piston installed so as to reciprocate in the compression chamber;
A mover connected to the piston and reciprocating with the piston;
The linear compressor according to claim 1, further comprising: a resonance spring that is disposed above the mover and doubles the reciprocating motion of the piston and the mover. A support member coupled to an upper portion of the resonance spring;
The limiting protrusion is formed to protrude upward toward the top of the casing at the top of the support member,
The linear compressor according to claim 2, wherein the stopper is provided at a zenith portion inside the casing so as to accommodate the limiting protrusion. A support member coupled to an upper portion of the resonance spring;
The limiting protrusion is formed to protrude downward toward the support member at the top of the casing.
The linear compressor according to claim 2, wherein the stopper is formed on an upper portion of the support member so as to accommodate the limiting protrusion.   5. The linear compressor according to claim 3, wherein the support member includes a coupling portion that extends radially downward from a central portion and couples with an upper portion of the resonance spring. 6.

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