KR101136202B1 - Muffler assembly for linear compressor - Google Patents

Abstract

The muffler assembly of the linear compressor according to the present invention has a shell in which the inflow and outflow pipes of the refrigerant flow in and out, and a compression space therebetween while forming a compression space therebetween while reciprocating linear movement inside the cylinder installed inside the shell. A piston which is sucked into the compression space and compressed, and then discharged, a cylindrical support member which is located inside the inlet pipe of the shell and whose inlet and outlet are formed in the line and the rear end in the axial direction, and the inlet and the outlet inside the support member An inner noise pipe and a partition wall arranged in the axial direction to rapidly expand / reduce the flow space of the refrigerant, or increase the flow resistance of the refrigerant, and the other end inside the piston with one end fixed to the outlet of the support member. It is installed so as to protrude in the axial direction in the long direction made of an external sound pipe for the refrigerant flow, the internal sound pipe and the partition and the external sound pipe is a refrigerant Is made of plastic material with low heat transfer rate in order to reduce heat loss that may be caused by heat transfer as it flows in direct contact, and not only can reduce heat loss but also reduce processing cost and material cost. Can be reduced.

Linear compressor, cylinder, piston, muffler, sound pipe, bulkhead, plastic

Description

Muffler Assembly for Linear Compressor {MUFFLER ASSEMBLY FOR LINEAR COMPRESSOR}

1 is a side cross-sectional view showing a portion of a linear compressor to which a muffler assembly according to the prior art is shown;

Figure 2 is a side cross-sectional view showing a muffler assembly according to the prior art,

3 is a side cross-sectional view showing a portion of a linear compressor to which a muffler assembly according to the present invention is applied;

Figure 4 is a side cross-sectional view of the muffler assembly according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

80: muffler assembly 82: support member

84: internal sound pipe 86: partition wall

88: external sound pipe 90: mass member

The present invention is directed to a muffler assembly of a linear compressor installed on the piston side in order to reduce the flow noise of the refrigerant in the process of ejecting and compressing the refrigerant into the compression space formed therebetween while the piston reciprocating linear movement inside the cylinder. In particular, it relates to a muffler assembly of a linear compressor that can reduce the heat loss due to heat transfer as well as the material cost by using only the plastic material flow portion.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder to form a compression space in which the working gas is sucked and discharged between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, the piston is directly connected to the reciprocating linear motion drive motor, so that there is no mechanical loss due to the motion conversion to improve the compression efficiency as well as a simple linear compressor has been developed a lot.

Normally, a linear compressor is configured to suck and compress refrigerant and then discharge the refrigerant while the piston is moved reciprocally linearly in the cylinder by the linear motor inside the sealed shell, the linear motor being permanent between the inner and outer stators. The magnets are positioned so that the permanent magnets are linearly reciprocated by mutual electromagnetic forces. As the permanent magnets are driven in connection with the pistons, the pistons reciprocate linearly inside the cylinders to inhale and compress the refrigerant, and then discharge them. To do that.

1 is a side sectional view showing a portion of a linear compressor to which a muffler assembly according to the prior art is shown, and FIG. 2 is a side sectional view showing a muffler assembly according to the prior art.

Looking at the linear compressor with a muffler assembly according to the prior art with reference to Figure 1, the inlet pipe (not shown) and the outlet pipe (not shown) are connected to each side of the shell (not shown), the refrigerant flows in / out One end of the piston 4 is inserted into the cylinder 2 installed inside the shell to form a compression space in which the refrigerant is compressed, and the other end of the piston 4 is installed to be connected to the linear motor 10. A suction hole 4h is formed at one end of the piston 4 to allow the refrigerant to be sucked into the compression space, and a suction valve 6 is installed to open and close the cylinder 4, and at one end of the cylinder 2 in the compression space. A discharge valve assembly 8 is installed to discharge the compressed refrigerant, and a muffler assembly 30 made of metal is installed inside one end of the piston 4 to reduce the flow noise of the refrigerant.

Here, one end of the piston (4) is inserted into the inside of the state in which one end of the cylinder (2) is fixed to the frame body 3 to form the compression space between the cylinder (2) and the piston (4) The other end of the piston 4 is installed to be connected to the mover of the linear motor 10 so that the piston 4 moves reciprocally linearly as the linear motor 10 is driven.

In addition, one end of the piston 4 is connected to the supporter 24 so as to extend radially and at the same time a plurality of springs are installed to elastically support in the axial direction.

Next, the linear motor 10 includes an inner stay 12 in which a plurality of laminations are laminated in the circumferential direction, and a coil winding body in which the coil is wound in the circumferential direction by being positioned at regular intervals on the outer circumferential surface of the inner stator 12. It consists of a stator composed of an outer stator 14 configured to stack a plurality of laminations in the circumferential direction, and a mover which is a permanent magnet 16 movably axially disposed between the inner stator 12 and the outer stator 14. As the electric current is supplied to the outer stator 14, the permanent magnet 16 is installed between the inner stator 12 and the outer stator 14 by mutual electromagnetic force to reciprocate linearly in the axial direction. .

At this time, the inner stator 12 is installed so that one end is supported by the main frame 3 and the other end is fixed to the outer peripheral surface of the cylinder 2 by a fixing ring (not shown), and the outer stator 14 ) Is also supported by the main body frame (3) at the same time the other end is supported by a separate motor cover 22, the motor cover 22 by the axially long bolt to the body frame (3) It is fixed, the permanent magnet 16 is installed to be connected to the other end of the piston (4).

Next, the suction valve 6 has a thin plate shape, the center of which is bolted to one end of the piston 4, and one end thereof opens and closes the suction hole 4h of the piston according to the internal pressure of the compression space. It is installed so as to penetrate the inside of the piston 4 so that the refrigerant flows into the compression space.

Next, the discharge valve assembly 8 is discharge valve 8a positioned to block one end of the cylinder 2 and fixed to one end of the cylinder 2 before the refrigerant compressed in the compression space is discharged to the outside. A discharge valve 8b temporarily stored therein and a spiral discharge valve spring 8c that elastically supports the discharge valve 8a in the axial direction inside the discharge cap 8b, wherein the discharge valve 8a Is installed to open and close one end of the cylinder (2) in accordance with the internal pressure of the compression space.

Next, as illustrated in FIG. 2, the muffler assembly 30 has a relatively large diameter, and has a cylindrical support member 32 having an inlet and an outlet through which the refrigerant flows in and out at the rear end in the axial direction. Internal sound pipe 34 and various partitions 36a and 36b provided inside the inlet of the member 32 and a cylindrical external sound pipe 38 having a relatively small diameter provided outside the outlet of the support member 32. Although the muffler assembly 30 is difficult to mold all at once, each member is made of metal in the form of sheet metal and then assembled through a press-fitting process and a brazing process.

At this time, the inlet of the support member 32 and the inner sound pipe 34 is installed so as to be connected to the inlet pipe of the shell, the other end of the piston 4 is fixed to the radially extended to the support member 32 At the same time, the external sound pipe 38 is installed to be fixed to the inner side of the piston (4).

Of course, the muffler assembly 30 may be configured in various ways so that the size and shape of each component can reduce the flow noise at a specific frequency of the refrigerant.

Accordingly, in the linear compressor configured as described above, the piston 4 moves reciprocally linearly inside the cylinder 2 as the linear motor 10 operates, and accordingly, the pressure as the pressure inside the compression space varies. While the refrigerant passes through the muffler assembly 30 through the inlet pipe to reduce the flow noise of the refrigerant, even if the flow noise occurs as the refrigerant flows, the refrigerant is rapidly expanded or reduced, or the flow resistance is large Noise is reduced while passing through the flow path, and the refrigerant passing through the suction hole 4h of the piston is introduced into the compression space, compressed, and then discharged to the outside.

However, the muffler assembly of the linear compressor according to the prior art is not easy to mold as each component through which the refrigerant flows is formed of a metal material, and because of this, each component is assembled through a press-in process and a brazing process. The higher the processing cost, the higher the production cost, and the longer the assembly time, the lower the production efficiency.

The present invention has been made to solve the above problems of the prior art, the object of the present invention is to provide a muffler assembly of a linear compressor that is easy to form and assemble by forming a plastic material other than the portion requiring strength. .

The muffler assembly of the linear compressor according to the present invention for solving the above problems is a shell provided with the inlet and outlet pipes for the refrigerant flows in and out, and compression between them while reciprocating linear movement in the cylinder installed inside the shell A space for forming a space and sucking and compressing the refrigerant into the compression space, and then discharging the piston; a cylindrical support member positioned in the inlet and the outlet in the axial direction and positioned inside the inlet pipe of the shell; An inner noise tube and a partition wall arranged in the axial direction between the inlet and the outlet of the support member to rapidly expand / reduce the flow space of the refrigerant or increase the flow resistance of the refrigerant, and one end is fixed to the outlet of the support member. In the state, the other end is installed so as to protrude in the axial direction long inside the piston is made of an external sound pipe for the refrigerant flow, the internal sound pipe And the partition wall and the external sound pipe are made of a plastic material having a low heat transfer rate in order to reduce heat loss that may occur due to heat transfer as the refrigerant flows in direct contact.

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

3 is a side sectional view showing a portion of a linear compressor to which a muffler assembly according to the present invention is applied, and FIG. 4 is a side sectional view showing a muffler assembly according to the present invention.

The linear compressor to which the muffler assembly according to the present invention is applied has a cylinder 52 and a piston inside a shell in which an inlet pipe (not shown) and an outlet pipe (not shown) are connected to each other, as shown in FIG. 3. 54 and the linear motor 60 are assembled so that the refrigerant is sucked into the compression space formed between the cylinder 52 and the piston 54 as the piston 54 is driven by the linear motor 60. The muffler assembly 80 is configured to be discharged after being compressed, and is assembled with various components on the flow path through which the refrigerant flows before flowing into the compression space in order to reduce noise generated as the refrigerant flows. Although installed, the muffler assembly 80 is made of a plastic component that constitutes a flow path through which a refrigerant flows to facilitate molding and assembly.

Of course, one end of the piston (54) is provided with a suction hole (54h) in the axial direction so that the refrigerant flows into the compression space and the suction valve (56) can be opened and closed, the one end of the cylinder (52) The discharge valve assembly 58 is installed to open and close so that the refrigerant compressed in the compression space can be discharged.

Here, the cylinder 52 is installed to be fixed in a state where one end is penetrated through the frame body 53, and one end of the piston 54 is inserted into the cylinder 52 so that the cylinder 52 and the piston 54 are inserted therein. The compression space is formed therebetween, and the other end of the piston 54 is installed to be connected to the mover of the linear motor 60 so that the piston 54 reciprocates linearly as the linear motor 60 is driven. To be installed.

In addition, one end of the piston 54 is connected and installed so that the supporter 74 extends in the radial direction so that the piston 54 can be buffered and supported in the axial direction even when the piston 54 is reciprocally linearly moved by the linear motor 60. A plurality of springs are installed on both sides of the supporter 74 in the axial direction.

Next, the linear motor 60 is a stator composed of an inner stay 62 and an outer stator 64 and a permanent magnet 66 installed between the inner stator 62 and the outer stator 64 as in the prior art. It consists of a ruler, the permanent magnet 66 is installed between the inner stator 62 and the outer stator 64 by mutual electromagnetic force is installed to reciprocate linearly in the axial direction.

In this case, the inner stator 62 is installed to be fixed by the main frame 53 and a separate fixing ring (not shown), and the outer stator 64 also includes the main frame 53 and a separate motor cover ( It is fixed to be supported by 72, the permanent magnet 66 is installed to be connected to the other end of the piston (54).

Next, the suction valve 56 has a thin plate shape and a bolt is fixed to one end of the piston 54 so that one end thereof opens and closes the suction hole 54h of the piston according to the internal pressure of the compression space. The discharge valve assembly 58 is composed of a discharge valve 58a, a discharge cap 58b and a discharge valve spring 58c, wherein the suction valve 56 and the discharge valve 58a are formed in the compressed space. The suction holes 54h and one end of the cylinder 52 are respectively opened and closed according to the internal pressure.

Next, the muffler assembly 80 has a relatively large diameter, as shown in FIG. An inner sound pipe 84 and a partition wall 86 made of a plastic material installed inside the inlet of the support member 82 and a cylindrical outer sound pipe made of a plastic material having a relatively small diameter installed outside the outlet of the support member 82. It consists of 88.

At this time, the support member 82 is made of a metal material, as well as other components other than the support member 82 of the muffler assembly 80 can be assembled, as well as to be supported on the other end of the piston 54 To provide a certain strength.

However, both the inner sound pipe 84 and the partition wall 86 and the outer sound pipe 88 are not only easy to mold but also constitute a flow path through which a coolant flows in a plastic material having a low heat transfer rate. Not only can it be manufactured but also the heat transfer efficiency is low even if the refrigerant flows, which can reduce the heat loss that can be caused by heat transfer.

In particular, the inner sound pipe 84 and the partition wall 86 are configured to be assembled in order from the outlet of the support member 82 so as to be supported by an assembly protrusion (not shown) formed inside the support member 82, respectively. The outer sound pipe (88) has one end of the elastic close contact portion 89, the elastic close contact portion 89 of the outer sound pipe (88) to be pressed into the outlet of the support member 82 using the elastic force of the material itself. It can also be configured.

Of course, since the partition 86 and the external sound pipe 88 are both made of plastic, the partition 86 and the external sound pipe 88 may be configured to be integrally formed, as well as the support member 82. Various components inserted into the inside may be configured in various ways, and the size and shape of each component may reduce flow noise at a specific frequency of the refrigerant.

On the other hand, the muffler assembly 80 is classified as a movable member reciprocating linear movement together with the piston 54 and the permanent magnet 66, the design of the movement of the linear motor 60 according to the natural frequency of the movable member When the frequency is determined to be determined, the natural frequency and corresponding mass of the movable member is preset.

Therefore, in order to maintain the mass of the movable member, even if the mass is reduced as the internal sound pipe 84 and the partition wall 86 and the external sound pipe 88 constituting the muffler assembly 80 are formed of plastic. The mass member 90 is configured to be further installed outside the vertical axis of the support member 82, and the mass member 90 may configure the mass of the muffler assembly 80 in various product models. Can be applied.

In the muffler assembly 80 configured as described above, the mass member 90 is fixed inside the inlet of the support member 82, and the inner sound pipe 84 and the partition wall are sequentially sequentially inside the outlet of the support member 82. After the 86 and the external sound pipe (88) is assembled, the inlet of the support member 82 and the internal sound pipe (84) is installed so as to be connected to the inlet pipe of the shell, and the support member (82) A fixing portion formed to extend in a radial direction at one end of the external sound pipe 88 to be connected is installed to be fixed to the other end of the piston 54 and the external sound pipe 88 is located inside the piston 54. Is installed.

Accordingly, in the linear compressor configured as described above, the piston 54 moves reciprocally linearly in the cylinder 52 as the linear motor 60 is operated, and accordingly the pressure in the compression space is variable. While the refrigerant passes through the muffler assembly 80 through the inlet pipe to reduce the flow noise of the refrigerant, even if the noise is generated as the refrigerant flows, the refrigerant is the internal sound pipe 84, the partition wall 86 ) And the external sound pipe 88 is rapidly expanded and contracted, or the flow loss is generated by a large flow resistance to reduce the noise, the refrigerant passing through the suction hole (54h) of the piston into the compression space It is introduced, compressed and discharged to the outside.

At this time, since the inner sound pipe 84, the partition 86 and the outer sound pipe 88 is made of a low heat transfer plastic material, even if the refrigerant flows along the muffler assembly 80, the heat loss due to heat transfer is reduced. Can be reduced.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The muffler assembly of the linear compressor according to the present invention configured as described above may be molded into various shapes because the internal sound pipe and the partition wall and the external sound pipe through which the refrigerant flows are made of a plastic material except for the support member constituting the external appearance. In addition, it is easy to assemble, thereby reducing production cost and shortening assembly time. Furthermore, as the flow path through which the refrigerant flows is made of plastic with low heat transfer rate, heat loss due to heat transfer can be reduced, thereby improving compression performance. There is an advantage to this.

Claims (5)

A shell provided with an inlet pipe and an outlet pipe through which the refrigerant flows in and out; A piston for forming a compression space therebetween while reciprocating linear movement inside the cylinder installed inside the shell to inhale and compress the refrigerant into the compression space, and then discharge the piston; A cylindrical support member which is located inside the inlet pipe of the shell and whose inlet and outlet are formed in the axial direction at the front and rear ends thereof; An inner sound pipe and a partition wall arranged in the axial direction between the inlet and the outlet of the support member to expand / reduce the flow space of the refrigerant or to increase the flow resistance of the refrigerant; The other end is installed to protrude in the axial direction long inside the piston in the state that one end is fixed to the outlet of the support member is made of an external sound pipe, the refrigerant flows, The internal sound pipe, the partition wall and the external sound pipe are muffler of the linear compressor, characterized in that the heat transfer rate is made of a plastic material to reduce the heat loss that can occur due to the heat transfer as the refrigerant is in direct contact with the flow assembly. The method of claim 1, The support member is a muffler assembly of a linear compressor, characterized in that made of a metal material for strength reinforcement. The method of claim 1, The partition wall and the external sound pipe are integrally formed so that a portion of the partition wall and the external sound pipe is installed inside the outlet of the support member muffler assembly. 4. The method according to any one of claims 1 to 3, The external sound pipe is a muffler assembly of the linear compressor, characterized in that the elastic contact portion (89) of the inner diameter of the external sound pipe is expanded so that it can be fitted to the outlet of the support member. The method of claim 4, wherein Muffler assembly of the linear compressor, characterized in that the mass member is further provided outside the inlet of the support member to compensate for the mass reduction caused by the inner sound pipe, the partition wall and the outer sound pipe made of a plastic material.

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