JP2005256833A - Linear compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear compressor for canceling out vibration of a specific frequency band transmitted from a reciprocating piston to a sealed vessel. <P>SOLUTION: A stopper 60 prevents a cylinder block 21 from coming off, and has a dynamic vibration absorbing device 70 for canceling out vibration of the specific frequency band of the sealed vessel 10. The dynamic vibration absorbing device 70 constituted of: an elastic member 80 disposed to a lower end of the stopper 60; and a mass member 90 fixed to a lower face of the elastic member 80. The elastic member 80 is in a shape of a spiral plate. A through part 80 is formed to a center side of the elastic member 80 to correspond to an opening part 61 of the stopper 60, and both end parts thereof have symmetric mounting parts 82 to fix the mass member 90. The mass member 90 is in a shape of a plate, and has a center hole part 91 corresponding to the through part 81 of the elastic member 80 so that a support part 52 of a stopper frame 50 can be inserted into the center side of the mass member 90. The mass member 90 has symmetric both sides whose center of symmetry of the center hole part 91, and both end parts thereof are welded to or fastened by bolts to mounting part 82 of the elastic member 80. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a linear compressor, and more particularly to a linear compressor capable of canceling vibrations in a specific frequency band transmitted to a sealed container by reciprocating motion of a piston.

  In general, a linear compressor is used for compressing a refrigerant in a cooling device such as a refrigerator or an air conditioner, and usually includes a linear motor that performs a linear reciprocating motion as a driving device for advancing and retracting a piston. .

  Such a linear compressor has a cylinder block in which a compression chamber is formed, a piston provided to be able to advance and retreat in the compression chamber of the cylinder block, and a suction chamber and a discharge chamber so that refrigerant can be sucked and discharged. A valve device is provided between the cylinder block and the cylinder head for controlling the flow of refrigerant.

  In addition, the drive device for moving the piston back and forth is fixed to the movable member having one side coupled with the piston and the other side provided with a cylindrical permanent magnet surrounding the cylinder block, and inside and outside of the movable member. It consists of a linear motor including an inner stator and an outer stator arranged in a state.

  In the conventional linear compressor having such a configuration, when an AC power source is applied to the outer stator, a magnetic field is formed between the outer stator and the inner stator, and the polarity of the magnetic field is periodic due to the characteristics of the AC power source. Therefore, the movable member provided with the permanent magnet is moved up and down. At the same time, the piston coupled to the movable member compresses the refrigerant while moving back and forth inside the compression chamber. At this time, vibration in a specific frequency band generated by the reciprocating motion of the piston is transmitted to the sealed container as it is. The container is vibrated. The vibration of the closed container as described above is a main cause of compressor noise.

  Accordingly, an object of the present invention is to provide a linear compressor including a dynamic vibration absorber so as to cancel vibrations in a specific frequency band of an airtight container.

  In order to achieve the above object, a linear compressor according to the present invention includes a sealed container that forms a sealed space, a cylinder block that is provided inside the sealed container and forms a compression chamber, and a cylinder block on the cylinder block side. A stopper frame to be fixed; a stopper provided in the closed container so as to support the stopper frame; and a dynamic vibration absorber provided in the stopper so as to cancel vibrations in a specific frequency band of the closed container. It is characterized by including.

  The dynamic vibration absorber includes an elastic member fixed to the stopper and a mass member fixed to the elastic member.

  In addition, one end of the stopper is fixed to the airtight container, and the other end is formed with an opening so that the stopper frame can be inserted, and the elastic member is provided on the opening side so that the stopper frame passes therethrough. As described above, a through portion corresponding to the opening is provided.

  In addition, the elastic member has a spiral plate shape, and the through portion is formed substantially in the center.

  And the said mass member is plate shape, Comprising: The inside hole part corresponding to the said opening part was comprised, It is characterized by the above-mentioned.

  In addition, the mass member is provided so that both sides thereof are symmetrical with respect to the inner hole portion.

  The elastic member is integrally extended from one end of the stopper.

  In addition, the elastic coefficient of the elastic member and the mass of the mass member are determined so that a specific frequency transmitted to the sealed container matches a frequency of the dynamic vibration absorber.

  As described above, the linear compressor of the present invention is provided with the dynamic vibration absorber in the stopper for preventing the cylinder block from being detached, and the dynamic vibration absorber includes the elastic member and the mass member.

  Therefore, the vibration of the specific frequency band transmitted to the sealed container by the reciprocating motion of the piston is canceled out by the mass member that moves in the opposite phase to the piston, so that the quiet compressor operation is performed.

  Since the linear compressor according to the present invention is provided with the stopper and the dynamic vibration absorber as a single unit, the number of parts is reduced and the space utilization inside the compressor is improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing the entire structure of a linear compressor according to the present invention. Referring to this, the linear compressor according to the present invention supplies a refrigerant into a sealed container 10 forming a sealed space. A compression device 20 that sucks and compresses and discharges, and a drive device 30 that drives the compression device 20 are provided.

  The compression device 20 includes a cylinder block 21 provided with a compression chamber 21a so that refrigerant can be compressed, a piston 22 provided in the compression chamber 21a so as to be capable of reciprocating, and a cylinder formed with a suction chamber 23a and a discharge chamber 23b, respectively. Head 23. A valve device 24 for adjusting the inflow of refrigerant is provided between the cylinder block 21 and the cylinder head 23.

  The drive device 30 includes a movable member 31 that reciprocates together with the piston 22, and a linear motor including an inner stator 32 and an outer stator 33 disposed on the inner side and the outer side of the movable member 31, respectively.

  The movable member 31 has a cylindrical shape, and the same axis as the cylindrical portion 31a provided so as to surround the upper outer side of the cylinder block 21 and the connecting shaft 22a provided at the upper end of the piston 22 so as to advance and retreat with the piston 22 up and down. The permanent magnet 31c is integrated with the cylindrical portion 31a so that the movable member 31 can be advanced and retracted through electromagnetic interaction with both the stators 32 and 33. Combined with

  The inner stator 32 and the outer stator 33 are respectively disposed inside and outside the cylindrical portion 31a of the movable member 31. The inner stator 32 is cylindrical and is fixed to the outer surface of the cylinder block 21 to be movable. It has a function of guiding the vertical movement of the member 31 and smoothing the flow of magnetic flux from the outer stator 33 through the permanent magnet 31 c of the movable member 31. The outer stator 33 is wound with an exciting coil 33 a that moves the movable member 31 back and forth through electromagnetic interaction with the permanent magnet 31 c of the movable member 31. The lower end of the outer stator 33 is the lower end of the cylinder block 21. The upper end is supported by a support portion 21b extended outward, and the upper end is supported through a separate fixed frame 40.

  In addition, a multi-layer leaf spring 41 for doubling the kinetic force of the piston 22 through elasticity and a stopper frame 50 for preventing the cylinder block 21 from being detached are sequentially provided on the upper portion of the fixed frame 40 for fixing the outer stator 33. The stopper frame 50 is supported by a stopper 60 fixed to the upper inner surface of the sealed container 10.

  The stopper frame 50 includes a plurality of extension portions 51 extending in a sagittal manner from the fixed frame 40 and a support portion 52 bent and extended from the extended end portion of each extension portion 51 to the stopper 60 side. Is done.

  The stopper 60 has a cylindrical shape, the upper end of which is fixed to the inner surface of the hermetic container 10, and the lower end forms an opening 61 so that the support portion 52 of the stopper frame 50 is inserted. The stopper 60 is provided with a dynamic vibration absorber 70 so that vibrations in a specific frequency band of the sealed container 10 can be canceled. The dynamic vibration absorber 70 provided in the present invention will be described in detail with reference to FIG. 2 below. I will decide.

  Referring to FIG. 2, the dynamic vibration damping device 70 includes an elastic member 80 provided at the lower end of the stopper 60 and a mass member 90 fixed to the lower surface of the elastic member 80.

  The elastic member 80 has a spiral plate shape, and a through-hole portion 81 corresponding to the opening 61 of the stopper 60 is formed at the center so that the support portion 52 of the stopper frame 50 passes, and mass is formed at both ends. The installation part 82 for fixing the member 90 is provided so as to be symmetrical.

  The mass member 90 is plate-shaped, and an inner hole portion 91 corresponding to the opening 61 of the stopper 60 is formed on the center side thereof. The mass member 90 is formed so that both sides are symmetrical with respect to the center hole portion 91, and both end portions are welded or bolted to the installation portion 82 of the elastic member 80.

  Also, as shown in FIG. 3, the elastic member 80 can be integrally formed outside the opening 61 of the stopper 60, and the mass member 90 is welded or bolted to the lower surface of the elastic member 80. It will be concluded.

  Next, the operation and action of the linear compressor provided as described above will be described.

  When an AC power supply is applied to the coil 33a of the outer stator 33, a magnetic field is formed between the outer stator 33 and the inner stator 32, and the polarity of the magnetic field periodically changes due to the characteristics of the AC power supply. Therefore, the movable member 31 provided with the permanent magnet 31c and the piston 22 coupled thereto compress the refrigerant while moving forward and backward in the compression chamber 21a at the same frequency as the input power source. At this time, vibrations in a specific frequency band corresponding to the reciprocating motion of the piston 22 are transmitted to the sealed container 10, and such vibrations in the specific frequency band are canceled by the dynamic vibration absorber 70 provided in the stopper 60.

  That is, when the elastic coefficient of the elastic member 80 and the mass of the mass member 90 are set so that the specific frequency for exciting the sealed container 10 and the natural frequency of the dynamic vibration absorber 70 match, the mass member 90 of the dynamic vibration absorber 70 is The vibration of the specific frequency band of the sealed container 10 is canceled while performing the relative motion in the opposite phase to the piston 22.

It is sectional drawing which showed the whole structure of the linear compressor by this invention. It is the perspective view which showed the dynamic vibration damper provided in the linear compressor by this invention. It is the perspective view which showed the other Example of the dynamic vibration damper provided in the linear compressor by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Airtight container 20 Compression apparatus 21 Cylinder block 21a Compression chamber 21b Support part 22 Piston 22a Connecting shaft 23 Cylinder head 23a Suction chamber 23b Discharge chamber 24 Valve apparatus 30 Drive apparatus 31 Movable member 31a Cylindrical part 31b Fixed part 31c Permanent magnet 32 Inner fixed Child 33 Outer stator 33a Excitation coil 40 Fixed frame 41 Leaf spring 50 Stopper frame 52 Supporting portion 60 Stopper 61 Opening portion 70 Dynamic vibration absorber 80 Elastic member 81 Through portion 82 Installation portion 90 Mass member 91 Middle hole portion

Claims (8)

A sealed container forming a sealed space;
A cylinder block provided inside the sealed container to form a compression chamber;
A stopper frame fixed to the cylinder block side;
A stopper provided in the sealed container to support the stopper frame;
A linear compressor comprising: a dynamic vibration absorber provided on the stopper so as to cancel vibrations in a specific frequency band of the sealed container.   The linear compressor according to claim 1, wherein the dynamic vibration absorber includes an elastic member fixed to the stopper and a mass member fixed to the elastic member. One end of the stopper is fixed to the sealed container, and the other end is formed with an opening so that the stopper frame is inserted,
The linear compressor according to claim 2, wherein the elastic member is provided on the opening side and includes a through portion corresponding to the opening so that the stopper frame passes therethrough.   The linear compressor according to claim 3, wherein the elastic member has a spiral plate shape, and the penetrating portion is formed substantially at the center thereof.   The linear compressor according to claim 2, wherein the mass member has a plate shape and includes a hole portion corresponding to the opening.   The linear compressor according to claim 5, wherein the mass member is provided so that both sides thereof are symmetrical with respect to the center hole portion.   The linear compressor according to claim 2, wherein the elastic member is integrally extended from one end of the stopper.   3. The linear compression according to claim 2, wherein the elastic coefficient of the elastic member and the mass of the mass member are determined such that a specific frequency transmitted to the sealed container matches a frequency of the dynamic vibration absorber. vessel.

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