JP2006189038A - Linear compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small linear compressor reducing vibration and having high durability and reliability. <P>SOLUTION: A vibration absorbing unit is mounted outside of a shell and the number of components inside the shell and the size of the shell are reduced, resulting in reduction in the size of the compressor. The vibration absorbing unit is enclosed by a protective cover. This protects the vibration absorbing unit from exterior shock or impurities and prevents damage and malfunction of components. As a result, durability and reliability of the compressor are improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear compressor, and in particular, a vibration absorbing mechanism is installed outside the shell, and a protective cover is attached to the outside of the vibration absorbing mechanism to reduce the size of the shell and at the same time vibrate from the outside. The present invention relates to a linear compressor that protects an absorption mechanism and, as a result, improves durability and reliability.

  In general, a linear compressor performs a function of sucking, compressing, and discharging fluid while linearly reciprocating a piston within a cylinder using a linear driving force of a linear motor.

  A conventional linear compressor includes a compression unit that is disposed inside a shell and includes a piston and a cylinder that compresses a fluid, and a stator that generates a driving force so that the piston reciprocates linearly inside the cylinder. And a linear motor composed of a mover.

  Here, the cylinder has a cylindrical structure that is open on both sides. Therefore, a piston is inserted on one side, and a discharge cover for discharging fluid compressed by the piston is arranged on the other side. . A compression chamber is formed between the piston and the discharge cover.

A discharge valve that opens and closes the compression chamber is elastically supported by the discharge cover.
The linear motor includes an outer core, an inner core arranged to have a certain gap with the outer core, a bobbin attached to the outer core, and a stator including a coil wound around the bobbin, A magnet that is linearly reciprocated by a magnetic force formed around the coil, and a mover that includes a magnet frame that transmits the linear reciprocating motion of the magnet to the piston.

  Here, a magnet is attached to one side of the magnet frame, and a piston is fixed to the other side.

  In the conventional linear compressor configured as described above, when a voltage is applied to the coil, a magnetic field is formed around the coil, and the magnet is linearly reciprocated by the interaction with the magnetic field formed around the coil. Will come to do.

  This linear reciprocating motion of the magnet is transmitted to the piston via the magnet frame, so that the piston linearly reciprocates within the cylinder.

  Thus, the piston compresses the fluid in the cylinder while reciprocating linearly in the cylinder, and the compressed fluid is discharged from the discharge portion to the outside.

  However, in the conventional linear compressor, in addition to the moving parts for compressing the fluid, the parts that reduce vibration while supporting these parts are also arranged inside the shell, so there is a limit to downsizing. was there.

  In addition, when a component for reducing vibration is mounted outside the shell, the component is damaged or broken due to the influence of foreign matter or impact from the outside, leading to a problem that the durability and reliability of the compressor are lowered.

  The present invention has been devised in order to solve the above-described problems. The purpose of the present invention is to reduce the size of the product and protect the vibration absorption mechanism by installing the vibration absorption mechanism outside the shell. Another object of the present invention is to provide a linear compressor that is improved in durability and reliability by installing protective means.

  In order to achieve the above object, a linear compressor according to the present invention includes a shell having a suction port and a discharge port, a linear motor that is fixed inside the shell and generates a linear motion force, A cylinder fixed inside, a piston that is connected to the linear motor and compresses fluid while reciprocating linearly within the cylinder, a vibration absorbing mechanism that is installed outside the shell and absorbs vibration, and the vibration And a protection unit that is installed outside the absorption mechanism and protects the vibration absorption mechanism.

  The protective means may be a protective cover coupled to the shell so as to surround the vibration absorbing mechanism.

  The protective cover has a cylindrical structure with one side opened, and the opened end can be coupled to the shell.

  The protective cover may have a heat radiating hole so as to release the internal heat to the outside.

  The heat radiating holes are formed in a slit shape, and a plurality of the heat radiating holes can be arranged at a predetermined interval.

  The linear compressor is provided in front of the discharge port, and a discharge cover that buffers the fluid discharged from the discharge port, and a discharge pipe that is connected to the discharge cover and guides the fluid in the discharge cover to the outside. And can be further provided.

  A through hole through which the discharge pipe passes can be formed in the protective cover.

The vibration absorbing mechanism can be attached to the discharge cover.
The vibration absorbing mechanism includes a boss portion connected to the discharge cover, a mass portion arranged around the boss portion, and a plate spring connecting the boss portion and the mass portion. can do.

  The mass portion may have a circular ring structure.

  In the linear compressor according to the present invention, since the vibration absorbing mechanism is installed outside the shell, the number of parts inside the shell and the size of the shell are reduced, and as a result, the effect of miniaturization can be obtained.

  In addition, since a protective cover surrounding the vibration absorbing mechanism is provided, it is possible to protect the vibration absorbing mechanism from external impacts and foreign matters, and prevent damage and malfunction of components, resulting in improved durability and reliability. An effect is obtained.

  In addition, since a plurality of heat radiating holes are formed in the protective cover, the internal heat is released to the outside, and an effect of preventing overheating is obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, 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 inside of a linear compressor according to the present invention, and FIG. 2 is a side view showing the linear compressor according to the present invention.

  As shown in FIGS. 1 and 2, the linear compressor according to the present invention has a shell 50 having suction ports 51 and discharge ports 52 formed on both sides, and is fixed inside the shell 50 to generate a linear motion force. A linear motor 60, a cylinder 70 fixed inside the shell 50, a piston 71 connected to the linear motor 60 and compressing fluid while reciprocating linearly in the cylinder 70, and installed outside the shell 50; The vibration absorbing mechanism 80 that absorbs the vibration of the shell 50 and protective means that is installed outside the vibration absorbing mechanism 80 and protects the vibration absorbing mechanism 80 are provided.

A discharge unit assembly 90 that discharges the fluid compressed in the cylinder 70 is installed in front of the discharge port 52.
The shell 50 has a cylindrical structure. Therefore, the discharge port 52 is formed on the front surface, and the suction port 51 is formed on the rear surface. A suction pipe 53 through which fluid is sucked from the outside is provided through the suction port 51.

  The linear motor 60 is large and includes a stator and a mover. The stator includes an outer core 61 made of a laminate, an inner core 62 made of a laminate, and a coil 63 that is attached to the outer core 61 and forms a magnetic field. The mover is disposed between the outer core 61 and the inner core 62, the magnet 64 that moves linearly by the magnetic force formed around the coil 63, the magnet 64 and the piston 71 are fixed, And a magnet frame 65 that transmits the linear motion force of the magnet 64 to the piston 71.

The cylinder 70 is directly fixed to the inside of the shell 50, and in particular, is fixed to the discharge port 52 inside the shell 50.
The cylinder 70 has a cylindrical structure with both sides open, and a compression chamber C is formed in the inside by a piston 71 and a discharge unit assembly 90.

A spring support 74 is coupled to the piston 71 at the rear, and a main spring 75 that elastically supports the piston 71 is mounted between the front and rear surfaces of the spring support 74 and the shell 50.
A suction flow path 72 through which fluid is sucked through the suction pipe 53 is formed inside the piston 71, and a plurality of suction ports 73 are formed on the front surface of the piston 71. A suction valve 76 that opens and closes is mounted.
Further, behind the piston 71, a silencer 54 is provided which is connected to the suction pipe 53 and reduces suction noise.

  On the other hand, the discharge unit assembly 90 is fixed to the outside of the shell 50, and is closely attached to the opening of the cylinder 70 in the discharge cover 91 and the discharge cover 91 that buffers the fluid discharged from the discharge port 52. A discharge valve 92 that opens and closes and a discharge spring 93 that is supported by the discharge cover 91 and provides elastic force to the discharge valve 92 are configured.

  The discharge cover 91 has a cap shape and is coupled to the front surface of the shell 50. A discharge pipe 94 that guides the fluid flowing into the discharge cover 91 to the outside is connected to one side of the discharge cover 91.

  On the other hand, the vibration absorbing mechanism 80 is attached to the discharge cover 91. The vibration absorbing mechanism 80 includes a boss portion 82 that is connected to the discharge cover 91 by a connecting shaft 81, a mass portion 83 that is spaced apart from the boss portion 82 by a certain distance in the radial direction, a boss portion 82, and a mass portion. 83, and a plate spring 84 that couples to 83.

The mass portion 83 has a circular ring structure having a certain amount of mass, and a plurality of leaf springs 84 are provided so as to connect the boss portion 82 and the front and rear surfaces of the mass portion 83, respectively.
Here, the plate spring 84 is preferably coupled to the front and rear surfaces of the mass portion 83 with bolts.

On the other hand, the protection means is a protective cover 85 provided so as to surround the vibration absorbing mechanism 80 outside the vibration absorbing mechanism 80 so that the vibration absorbing mechanism 80 can be protected from external foreign matters and impacts.
The protective cover 85 has a cylindrical structure opened on one side, and the opened end is coupled to the front surface of the shell 50.

Here, the protective cover 85 is preferably coupled to the front surface of the shell 50 by welding or a fastening member.
A heat dissipation hole 87 is formed in the protective cover 85 so that heat inside the protective cover 85 is released to the outside.
Here, a plurality of the heat radiation holes 87 are formed in the side surface of the protective cover 85 in a slit shape at a predetermined interval.

  A through hole 86 through which the discharge pipe 94 passes is formed on one side of the protective cover 85 so that the discharge pipe 94 communicates with the outside.

Next, the operation of the linear compressor according to the present invention configured as described above will be described in detail.
When the linear motor 60 is activated, the magnet 64 reciprocates linearly by the interaction with the magnetic field formed around the coil 63.
The movement of the magnet 64 is transmitted to the piston 71 via the magnet frame 65, and the piston 71 compresses the fluid sucked into the compression chamber C of the cylinder 70 while continuously reciprocating linearly inside the cylinder 70. The operation of discharging into the discharge cover 91 is repeated.

  That is, when the piston 71 moves backward, the fluid in the suction flow path 72 of the piston 71 flows into the compression chamber C of the cylinder 70 through the suction port 73 while the suction valve 76 is opened.

  Thereafter, when the piston 71 moves forward toward the compression chamber C, the discharge valve 92 is pushed forward by the fluid compressed in the compression chamber C, and thus the compressed fluid is discharged from the discharge cover 91 and the discharge pipe 94. It is discharged to the outside through.

On the other hand, the vibration absorbing mechanism 80 absorbs vibration in the movement direction of the linear motor 60 and the piston 71 when the linear motor 60 is operated.
That is, not only the vibration in the movement direction of the piston 71 is absorbed by the plate spring 84, but also a mass body such as the mass portion 83 is further provided, so that the natural frequency of the linear compressor is reduced, resulting in linearity. The compressor vibration is attenuated.

  Since the protective cover 85 is attached to the outside of the vibration absorbing mechanism 80, the vibration absorbing mechanism 80 can be protected from an external impact and foreign matter by the protective cover 85.

It is a longitudinal cross-sectional view which shows the inside of the linear compressor by this invention. It is a side view which shows the linear compressor by this invention.

Explanation of symbols

50 Shell 51 Suction Port 52 Discharge Port 53 Suction Pipe 54 Muffler 60 Linear Motor 61 Outer Core 62 Inner Core 63 Coil 64 Magnet 65 Magnet Frame 70 Cylinder 71 Piston 72 Suction Channel 73 Suction Port 74 Spring Support 75 Main Spring 76 Suction Valve 80 Vibration absorbing mechanism 81 Connecting shaft 82 Boss portion 83 Mass portion 84 Plate spring 85 Protective cover 86 Through hole 87 Heat dissipation hole

Claims (10)

A shell formed with an inlet and an outlet;
A linear motor which is fixed inside the shell and generates a linear motion force;
A cylinder fixed inside the shell;
A piston connected to the linear motor and compressing fluid while reciprocating linearly in the cylinder;
A vibration absorbing mechanism installed outside the shell and absorbing vibration;
Protective means installed outside the vibration absorbing mechanism and protecting the vibration absorbing mechanism;
The linear compressor characterized by comprising.   The linear compressor according to claim 1, wherein the protection means is a protective cover coupled to the shell so as to surround the vibration absorbing mechanism.   The linear compressor according to claim 2, wherein the protective cover has a cylindrical structure with one side opened, and an open end is coupled to the shell.   The linear compressor according to claim 2, wherein the protective cover has a heat radiating hole so as to release internal heat to the outside.   The linear compressor according to claim 4, wherein the heat radiating holes are formed in a slit shape, and a plurality of the heat radiating holes are arranged at a predetermined interval. A discharge cover that is provided in front of the discharge port and cushions the fluid discharged from the discharge port;
A discharge pipe connected to the discharge cover and guiding fluid in the discharge cover to the outside;
The linear compressor according to claim 5, further comprising:   The linear compressor according to claim 6, wherein the protective cover has a through hole through which the discharge pipe passes.   The linear compressor according to claim 6, wherein the vibration absorbing mechanism is attached to the discharge cover.   The vibration absorbing mechanism includes a boss portion connected to the discharge cover, a mass portion arranged around the boss portion, and a plate spring connecting the boss portion and the mass portion. The linear compressor according to claim 8, wherein the linear compressor is characterized in that:   The linear compressor according to claim 9, wherein the mass portion has a circular ring structure.

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