KR20090041652A - Suction muffler of linear compressor - Google Patents

Abstract

A suction muffler of a linear compressor is provided to facilitate manufacturing process by reducing the number of parts and reduce cost by making a noise absorption pipe of plastic material. A suction muffler of a linear compressor(80) comprises a supporting member(82) having a cylindrical form, an inner noise absorption pipe(84), and a noise absorption pipe(86). In the supporting member, an inlet and an outlet are formed for refrigerant. The inner noise absorption pipe is longitudinally installed at the inlet of the supporting member in an axial direction. The noise absorption pipe is made of plastic material. The noise absorption pipe has: one end inserted into the outlet of the supporting member; and the other end located in the outside of the outlet of the supporting member in an axial direction.

Description

SUCTION MUFFLER OF LINEAR COMPRESSOR

The present invention provides a suction muffler 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, the present invention relates to a muffler of a linear compressor that not only simplifies the configuration of the suction muffler but also configures a part of a plastic material to increase performance and ease of manufacturing, and to reduce material and processing costs.

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 to improve the compression efficiency without mechanical loss due to the movement conversion has been developed a lot of linear compressor simple structure.

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

Looking at the linear compressor applied to the suction muffler according to the prior art with reference to Figure 1, the inlet pipe (1) and the outlet pipe (not shown) connected to each of the shell (3), the refrigerant flows in / out, is installed, One end of the piston 4 is inserted into the cylinder 2 installed inside the shell to form a compression space P in which the refrigerant is compressed, and the other end of the piston 4 is connected to the linear motor 10. At one end of the piston 4, a suction hole 4h is formed to allow the refrigerant to be sucked into the compression space P, and a suction valve 6 is installed to open and close the cylinder 4. The discharge valve assembly 8 is installed to discharge the refrigerant compressed in the compression space P, and the suction muffler 30 is installed inside one end of the piston 4 to reduce the flow noise.

Here, one end of the piston (4) is inserted into the inside of one end of the cylinder (2) is fixed to the frame body 5, the compression space (P) between the cylinder (2) and the piston (4) ) Is formed, and 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 is linearly reciprocated 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.

The linear motor 10 includes a plurality of inner stator 12 in which a plurality of laminations are stacked in a circumferential direction, and a coil winding body in which coils are wound in a circumferential direction, with a predetermined distance between the inner stator and the outer circumferential surface of the inner stator 12. Lamination is composed of a stator consisting of an outer stator 14 configured to be laminated in the circumferential direction, and a mover which is a permanent magnet 16 installed axially movable between the inner stator 12 and the outer stator 14, As the 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 linearly reciprocate in the axial direction.

At this time, the inner stator 12 is installed so that one end is supported by the main frame 5 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 The motor cover 22 is fixed to the main body frame 5 by an axially long bolt with one end supported by the main body frame 5 and the other end supported by a separate motor cover 22. The permanent magnet 16 is installed to be connected to the other end of the piston 4.

The suction valve 6 has a thin plate shape, the center of which is bolted to one end of the piston 4 so as to open and close the suction hole 4h of the piston according to the internal pressure of the compression space P. By passing through the piston (4) inside the refrigerant to be introduced into the compression space (P).

The discharge valve assembly 8 has a discharge valve 8a positioned to block one end of the cylinder 2 and a refrigerant fixed in one end of the cylinder 2 so that the refrigerant compressed in the compression space P is discharged to the outside. The discharge cover 8b temporarily stored before, and the spiral discharge valve spring 8c for elastically supporting the discharge valve 8a in the axial direction inside the discharge cover 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 (P).

In more detail, the suction muffler 30 has a cylindrical support member 32 having a relatively large diameter and an inlet / outlet for entering / exiting refrigerant at the front and rear ends in the axial direction, as shown in FIG. 2. And a vertical partition wall 36 capable of separating an inner space formed by the inner sound pipe 34 inside the inlet 44 of the support member and the inner sound pipe 34 inside the support member 32. And a horizontal partition wall 40 joined to the vertical partition wall 36 to form a horizontal shape, a cylindrical outer sound pipe 38 having a relatively small diameter installed outside the outlet of the support member 32, and the support. The member 32 and the connecting portion 42 for connecting the external sound pipe 38 and the like are all composed of six types of assembly parts. In this case, the fixing part radially extended to the support member 32 is installed by the fastening member so that both the piston 4 and the supporter 24 and the suction muffler 30 are fixed together at the other end of the piston 4. The external sound pipe 38 is installed to be located inside the piston 4.

3 is a perspective view showing a suction muffler according to the prior art. Intuitively in appearance, the support member 32, the external sound pipe 38, and the inlet 44 of the support member can be recognized.

At this time, the inlet of the support member 32 and the inner sound pipe 34 is installed to face each other with the inlet pipe of the shell, the fixed portion extending in the radial direction to the support member 32 of the piston (4) At the other end, the piston 4, the supporter 24, and the suction muffler 30 are both installed by the fastening member so as to be fixed together, and at the same time, the external sound pipe 38 is installed to be located inside the piston 4.

Accordingly, in the linear compressor configured as described above, as the linear motor 10 operates, the piston 4 linearly reciprocates inside the cylinder 2, and thus the pressure inside the compression space P is variable. As the refrigerant passes through the suction muffler 30 through the inlet pipe, the flow noise of the refrigerant is reduced while the refrigerant rapidly expands or contracts even when the flow noise is generated as the refrigerant flows. Noise is reduced while passing through a flow path having a large flow resistance, and the refrigerant passing through the suction hole 4h of the piston flows into the compression space P, is compressed, and then discharged to the outside.

The suction muffler as described above is composed of six kinds of assembly parts, and all of them are made of metal in the form of sheet metal. The production cost is high, there is a problem that the production cost is high due to the expensive metal material costs.

In addition, it takes a lot of time to assemble several assembly parts one by one, there is also a problem that the production efficiency is lowered.

The problem to be solved by the present invention is to reduce the number of assembly parts, to provide a suction muffler of the linear compressor made of a plastic material of the external sound pipe.

The present invention for solving the above problems is provided with a cylindrical support member having the inlet and outlet at both ends of the refrigerant flow in and out; An inner sound pipe installed in the axial direction at the inlet of the support member; In addition, one end is inserted into the outlet of the support member and the other end is long in the axial direction outside the outlet of the support member, an external sound pipe made of a plastic material; the suction muffler of the linear compressor comprising a to provide.

In the present invention, the external sound pipe is characterized in that at least one or more partitions are provided integrally therein.

In the present invention, the partition wall is characterized in that it comprises a cylindrical horizontal partition wall installed so as to overlap a portion of one end of the inner sound pipe, and vertical partition wall vertically extended in the radial direction from the horizontal partition wall.

In the present invention, the external sound pipe is forcibly pressed into the outlet of the support member.

In the present invention, a portion of the outer circumferential surface of the outer sound pipe is in surface contact with a portion of the inner circumferential surface of the outlet of the support member.

In the present invention, the support member is extended to the outer circumferential surface so as not to be connected to each other, it characterized in that it comprises a plurality of fixing parts provided with each bolt hole.

In the present invention, the support member and the inner sound pipe is characterized in that composed of a metallic material.

The suction muffler of the linear compressor according to the present invention reduces the assembly parts consisting of six to three, making the manufacturing process easier, and since the external sound pipe is made of plastic, the material cost and processing cost can be reduced, and the design freedom is increased. It works.

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

4 is a side sectional view showing a linear compressor to which a suction muffler is applied according to the present invention, and FIG. 5 is a side sectional view showing a suction muffler according to the present invention.

The linear compressor to which the suction muffler is applied according to the present invention includes a cylinder 52 inside the shell 53 in which an inlet tube 51 and an outlet tube (not shown) are connected and connected with refrigerant, as shown in FIG. 4. Compression space P formed between the cylinder 52 and the piston 54 as the piston 54 and the linear motor 60 are installed so that the piston 54 is driven by the linear motor 60. The refrigerant is sucked in, compressed, and then discharged, and assembled into various components on a flow path through which the refrigerant flows before entering the compression space P in order to reduce noise generated as the refrigerant flows. Suction muffler 80 is configured to be installed, the suction muffler (80) is made of a part of the plastic parts to facilitate molding and assembly.

Of course, at one end of the piston 54, a suction hole 54h is formed in the axial direction so that refrigerant may flow into the compression space P, and at the same time, the suction valve 56 is opened and closed so that the cylinder ( 52) At one end, the discharge valve assembly 58 is installed to open and close to allow the refrigerant compressed in the compression space P to be discharged.

Here, the cylinder 52 is installed to be fixed in a state where one end is penetrated through the frame body 55, and one end of the piston 54 is inserted into the cylinder 52 so that the cylinder 52 and the piston 54 are inserted. The compression space P 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 is driven as the linear motor 60 is driven. It is installed to reciprocate linear motion.

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.

The linear motor 60 is composed of a stator composed of an inner stator 62 and an outer stator 64 and a mover which is a permanent magnet 66 installed between the inner stator 62 and the outer stator 64 as in the prior art. However, the permanent magnet 66 is installed between the inner stator 62 and the outer stator 64 by mutual electromagnetic force to reciprocate linearly in the axial direction.

In this case, the inner stator 62 is installed to be fixed by the main frame 55 and a separate fixing ring (not shown), and the outer stator 64 also includes the main frame 55 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).

The suction valve 56 has a thin plate shape and its center is bolted 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 P. The discharge valve assembly 58 includes 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 the compression space P. The suction hole 54h and one end of the cylinder 52 are respectively opened and closed in accordance with the internal pressure.

In more detail, the suction muffler 80 has a relatively large diameter as shown in FIG. 5, and has an inlet 82 in through which coolant flows into the axial end and an outlet 82 out through which the rear coolant in the axial direction flows out. A cylindrical cylindrical support member 82 provided with a metal, an inner sound pipe 84 made of metal provided inside the inlet 82in of the support member 82, and an outlet 82out of the support member 82; It consists of a cylindrical outer sound pipe (86) of plastic material formed relatively small in diameter.

Since the support member 82 is made of a metal material, the support member 82 is provided with a predetermined strength so as to be stably fastened by a separate fastening member to the piston 54 (shown in FIG. 4) and the supporter 72 (shown in FIG. 4). In addition, four fixing parts 82a extended in the radial direction are separately provided on the outer circumferential surface thereof so as not to be connected to each other, and each fixing part 82a of the supporting member 82 includes a piston 54 (shown in FIG. 4) and a supporter ( 72: a bolt hole is provided to be bolted to (in Figure 4).

The inner sound pipe 84 is also provided in a cylindrical shape made of a metal material so that the tip is pressed into the inlet 82in of the support member 82.

The external sound pipe (86) is made of a plastic material can be manufactured in a variety of shapes and sizes, and without the need to make a separate assembly of the bulkhead, conventional vertical bulkheads and horizontal bulkheads and conventional support members and conventional The connection unit for connecting the external sound pipe and the external sound pipe 86 can be manufactured integrally. That is, the external sound pipe (86) is installed to surround a portion of the outer sound pipe (84) with a gap outside the rear end of the cylindrical horizontal partition wall (86a) partitioning the inside of the external sound pipe (86) in the horizontal direction. And a flat plate-like vertical partition 86b extending radially from the outer circumferential surface of the horizontal partition wall 86a to partition the inside of the external sound pipe 86 in the vertical direction. In addition, the outer sound pipe 86 is press-fitted so as to be in surface contact with a portion of the inside of the outlet 82out of the support member 82, and a portion of the outer circumferential surface of the outer sound pipe 86 to the cylindrical elastic contact portion A. At the same time, a portion of the inner circumferential surface of the outlet 82out of the support member 82 is composed of a cylindrical press-fitting portion B having a diameter smaller than the outer diameter of the elastic contact portion A of the outer sound pipe 86 by a predetermined gap. Of course, the support member 82 is formed of a metal material, while the external sound pipe 86 is formed of a plastic material so that the external sound pipe 86 can be pressed into the support member 82 by the elastic force of the material itself. do.

Looking at the assembly process of the suction muffler 80 as described above, the inner sound pipe (84) is press-fitted to be supported by the assembly projection (not shown) provided inside the inlet (82in) of the support member 82, the outside The sound absorbing tube 86 is press-fitted so as to be in surface contact with the inside of the outlet 82out of the support member 82, and the front end of the outer sound absorbing tube 86, that is, the horizontal partition wall 86a, is located outside the rear end of the inner sound absorbing tube 84. It is installed to overlap some sections with this gap. At this time, the elastic contact portion (A) of the external sound pipe (86) is pressed into the inside of the press-in portion (B) of the support member 82, the press-in portion (B) of the support member 82 and the external sound pipe (86). Elastic contact portions A are fixed while being in surface contact with each other.

Since the suction muffler 80 is made of a plastic material of the external sound pipe 86, various partition walls and the like can be integrally manufactured inside the external sound pipe 86 to increase design freedom, and further simplify the manufacturing process. At the same time, the assembly time can be shortened to increase production efficiency, and material cost and processing cost can be reduced.

On the other hand, since the support member 82 and the inner sound pipe 84 is made of a metal material that can increase the transmission loss of the noise than the plastic material, it can effectively reduce the flow noise of the refrigerant in terms of noise characteristics. . In addition, the external sound pipe (86) is made of a plastic material, the flow noise of the refrigerant passing through the external sound pipe (86) is easy to radiate to the outside, the horizontal bulkhead (86a) and the vertical of the external sound pipe (86) All of the partition walls 86b are installed inside the support member 82 made of metal, and the other parts are also installed inside the metal piston 54 (shown in FIG. 4). Since the structure is enclosed by the metal support member 82 and the piston 54 (shown in FIG. 4), the support of the metal material is achieved even if the flow noise of the refrigerant passing through the external sound pipe 86 made of plastic is radiated. It is interrupted by the member 82 and the piston 54 (shown in FIG. 4), and the radiation noise of the external sound pipe 86 can be effectively reduced.

6 is a perspective view showing a suction muffler according to the present invention. Intuitively in appearance, the support member 82 and the external sound pipe 86 having the inlet 82in of the support member 82 can be recognized. In addition, each fixing portion 82a extended radially to the support member 82 is designed to be much simpler than the conventional one, and is formed individually so as not to be connected to each other, thereby reducing the manufacturing process and manufacturing cost.

Thus, referring to the operation of the linear compressor configured as described above with reference to Figures 4 to 6, as the linear motor 60 is operated, the piston 54 reciprocates linearly inside the cylinder 52, Accordingly, as the pressure inside the compression space P is variable, the refrigerant passes the suction muffler 80 through the inlet pipe by the pressure difference, thereby reducing the flow noise of the refrigerant, and the flow noise as the refrigerant flows. Even if this occurs, the refrigerant is rapidly expanded / reduced while passing through the internal sound pipe 84 and the external sound pipe 86, or a flow loss occurs due to a large flow resistance, and noise is reduced. The refrigerant passing through 54h) flows into the compression space P, is compressed, and then discharged to the outside.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a side sectional view showing a linear compressor to which a suction muffler according to the prior art is applied;

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

3 is a perspective view showing a suction muffler according to the prior art,

4 is a side sectional view showing a linear compressor to which a suction muffler is applied according to the present invention;

5 is a side sectional view showing a suction muffler according to the present invention;

6 is a perspective view showing a suction muffler according to the present invention.

<Description of the symbols for the main parts of the drawings>

80: suction muffler

82: support member

84: internal sound tube

86: external sound pipe

Claims (7)

A cylindrical support member having both inlets and outlets through which refrigerant flows in and out; An inner sound pipe installed in the axial direction at the inlet of the support member; And, At least one end is inserted into the outlet of the support member and the other end is long in the axial direction outside the outlet of the support member, an external sound pipe made of plastic material; suction muffler of a linear compressor. The method of claim 1, The external sound pipe is a suction muffler of the linear compressor, characterized in that at least one partition wall is provided integrally therein. The method of claim 2, The partition wall is a suction muffler of the linear compressor, characterized in that it comprises a cylindrical horizontal partition wall installed so as to overlap a portion of the inner side of the inner sound pipe and a vertical partition vertically extended in the radial direction from the horizontal partition wall. The method of claim 1, The external sound pipe is a suction muffler of the linear compressor, characterized in that forcibly pressed into the outlet of the support member. The method of claim 4, wherein The suction muffler of the linear compressor, wherein a part of the outer circumferential surface of the external sound pipe is in surface contact with a part of the inner circumferential surface of the outlet of the support member. The method of claim 1, The support member is extended to the outer circumferential surface so as not to be connected to each other, the suction muffler of the linear compressor, characterized in that it comprises a plurality of fixing parts provided with each bolt hole. The method according to any one of claims 1 to 6, The suction member of the linear compressor, characterized in that the support member and the inner sound pipe are made of a metallic material.

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