KR20090041721A - Linear compressor - Google Patents

Abstract

A linear compressor is provided to prevent the noises generated in the frame from being delivered to the outside through the oil discharge hole. A linear compressor includes a shield film(522) which is positioned apart from an oil discharge hole(520h) in order to reduce the noise delivered to the outside through the oil discharge hole. The shield film is located opposite to the discharge direction of oil. The shield frame is integrally injection-molded on one side of a frame(520).

Description

Linear Compressor {LINEAR COMPRESSOR}

The present invention relates to a linear compressor, and more particularly, to a linear compressor capable of preventing noise from being transmitted to the outside through an oil discharge hole provided in a frame.

In general, the reciprocating compressor is configured to compress the refrigerant while the piston reciprocates linearly within the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder.

Recently, the reciprocating compressor includes a component such as a crank shaft in order to convert the rotational force of the drive motor to the reciprocating linear kinetic force of the piston, there is a problem that a large mechanical loss caused by the movement change occurs. Many linear compressors have been developed for this purpose.

Such a linear compressor, in particular, allows the piston to be directly connected to a linear motor in reciprocating linear motion, thereby eliminating mechanical loss due to motion switching, thereby improving compression efficiency, and having a simple structure, and controlling power input to the linear motor. Since the operation can be controlled, the noise is lower than that of other compressors, so it is widely applied to home appliances such as refrigerators used indoors.

1 is a view showing an example of a linear compressor according to the prior art. Conventional linear compressors have a frame (1), a cylinder (2), a piston (3), a suction valve (4), a discharge valve assembly (5), a motor cover (6), and a supporter (7) inside a shell (not shown). The structure consisting of the main body cover 8, the main springs S1 and S2, the muffler assembly 9, the linear motor 10, and the oil supply device 20 is installed to be elastically supported.

The cylinder 2 is fitted to the frame 1, and the discharge valve assembly 5 composed of the discharge valve 5a, the discharge cap 5b, the discharge valve spring 5c, and the discharge cover 5d is provided with the cylinder 2 Piston (3) is inserted inside the cylinder (2), while a thin suction valve (4) is installed to open and close the inlet (3a) of the piston (2).

The linear motor 10 is installed so that the permanent magnet 13 can reciprocate linearly while maintaining a gap between the inner stator 11 and the outer stator 12, and the permanent magnet 13 is connected by the connecting member 14. It is installed to be connected to the piston (3), and operates the piston (3) while the permanent magnet (13) reciprocating linear movement by mutual electromagnetic force between the inner stator (11), the outer stator (12) and the permanent magnet (13). .

The motor cover 6 is bolted to the frame 1 while supporting the outer stator 12 in the axial direction to fix the outer stator 12, and the body cover 8 is coupled to the motor cover 6. A supporter 7 connected to the other end of the piston 3 is installed between the motor cover 6 and the main body cover 8 so as to be elastically supported in the axial direction by the main springs S1 and S2, and sucks the refrigerant. The muffler assembly 9 is also fastened together with the supporter 7.

At this time, the main springs (S1, S2) includes four front springs (S1) and four rear springs (S2) in a position that is symmetrical up and down and left and right with respect to the supporter (7), the linear motor 10 is As it is actuated, the front springs S1 and the rear springs S2 behave in opposite directions to cushion the piston 3 and the supporter 7. In addition, the refrigerant on the compression space P side acts as a kind of gas spring to cushion the piston 3 and the supporter 7.

The oil supply device 20 includes an oil supply pipe, an oil pumping part, an oil valve assembly, and the like, and supplies oil to the cylinder 2 and the piston 3 through an oil supply flow passage 1in provided in the lower part of the frame 1. After supplying to the gap between the lubrication and cooling, the oil supplied to the gap between the cylinder (2) and the piston (3) is discharged through the oil recovery flow path (1out) provided inside the upper part of the frame (1) Let's do it.

Therefore, when the linear motor 10 is operated, the piston 3 and the muffler assembly 9 connected thereto are reciprocated linearly, and the suction valve 4 and the discharge valve assembly are changed as the pressure in the compression space P is varied. The operation of (5) is automatically adjusted, and by this operation, the refrigerant is compressed past the intake pipe on the shell side, the opening of the body cover 8, the muffler assembly 9, and the inlets 3a of the piston 3. It is sucked into the space P and compressed, and then exits through the discharge cap 5b, the roof pipe and the outlet pipe on the shell side.

At this time, vibration occurs as the piston 3 reciprocates linearly, and when the oil supply device 20 pumps oil at the bottom of the shell by vibration, the oil is supplied to the oil supply flow passage 1 in and the oil recovery flow passage 1 out. Pumping / circulating through) and lubricating / cooling parts such as cylinder (2) and piston (3), and then flowing down along one side of frame (1) again to collect the bottom of shell do.

2 is a view showing an example of a frame of a linear compressor according to the prior art. The conventional frame 1 is provided with a mounting hole (not shown) at the center so that the cylinder 200 (shown in FIG. 1) can be mounted, and at the same time, the mounting protrusion 1a in which the discharge cover 5d is seated around the mounting hole. And an oil discharge hole 1h corresponding to an end portion of the above-described oil discharge flow path 1out (shown in FIG. 1) is provided at a portion partially omitted above the mounting protrusion 1a. At this time, the oil discharged through the oil discharge hole (1h) flows downward along the one surface of the frame 1, including the mounting projection (1a).

However, in the linear compressor according to the related art, noise is generated when the discharge valve collides with the cylinder when the discharge valve is opened and closed, and various noises generated in the frame, such as the opening and closing noise of the discharge valve, cause the oil discharge hole of the frame. There is a problem that is transmitted to the outside of the frame to reduce the noise performance.

The present invention has been made to solve the above problems of the prior art, an object of the present invention is to provide a linear compressor that can reduce the transmission of noise to the outside of the frame through the oil discharge hole of the frame.

The present invention for solving the above problems is provided with a mounting hole frame; A cylinder having one end fixed to the mounting hole of the frame and having a compression space therein compressed therein; A piston for compressing the refrigerant while reciprocating linear motion inside the cylinder; An oil circulation passage provided inside the frame and circulating oil into a space between the cylinder and the piston; An oil discharge hole through which oil is discharged to communicate with an oil circulation passage on one surface of the frame; And a shielding film installed at a predetermined interval from the oil discharge hole and hitting oil discharged from the oil discharge hole to reduce noise.

In the linear compressor of the present invention, the shielding film is provided so as to face the discharge direction of the oil.

In the linear compressor of the present invention, the shielding film is injection molded integrally with one surface of the frame.

Since the linear compressor according to the present invention configured as described above is provided with a shielding film opposite to the oil discharge hole side of the frame, various noises generated inside the frame are reduced by hitting the shielding film even though it is transmitted through the oil discharge hole of the frame. Therefore, the noise performance can be improved, and furthermore, the oil may also be guided to flow along one side of the frame by hitting the shield.

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

3 is a view showing an example of a linear compressor according to the present invention.

An example of the linear compressor 100 according to the present invention includes a cylinder 200, a piston 300, an inner stator 420 and an outer stator 440, and a permanent magnet 460 in a shell 110 that is a closed container. Including linear motor 400, oil supply assembly 900, if the permanent magnet 460 is linearly reciprocated by the mutual electromagnetic force between the inner stator 420 and the outer stator 440, connected to the permanent magnet 460 The piston 300 is linearly reciprocated together with the permanent magnet 460, and the oil stored in the bottom surface of the shell 110 is pumped / supplied by the vibration of the piston 300 to the cylinder 200. ) And the piston 300 is lubricated.

The inner stator 420 is fixed to the outer circumference of the cylinder 200, the outer stator 440 is fixed by the frame 520 and the motor cover 540 in the axial direction, the frame 520 and the motor cover 540 Is coupled to each other by a fastening member such as a bolt, and the outer stator 440 is fixed between the frame 520 and the motor cover 540. The frame 520 may be integrally formed with the cylinder 200 or may be manufactured separately from the cylinder 200 and combined with the cylinder 200. 3 illustrates an example in which the frame 520 and the cylinder 200 are integrally formed.

The supporter 320 is connected to the rear of the piston 300. Four front main springs 820 are supported at both ends by the supporter 320 and the motor cover 540. In addition, the four rear main springs 840 are supported at both ends by the supporter 320 and the back cover 560, and the back cover 560 is coupled to the rear of the motor cover 540. A suction muffler 700 is also provided at the rear of the piston 300, and refrigerant flows into the piston 300 through the suction muffler 700 to reduce noise during suction.

The inside of the piston 300 is hollow to allow the refrigerant introduced through the suction muffler 700 to enter and compress the compression space P formed between the cylinder 200 and the piston 300. A suction valve 610 is installed at the front end of the piston 300, and the suction valve 610 is opened so that the refrigerant flows into the compression space P from the piston 300, and again the piston () in the compression space P. The tip of the piston 300 is closed so as not to flow into the 300.

When the refrigerant is compressed to a predetermined pressure or more by the piston 300 in the compression space P, the discharge valve 620 located at the tip of the cylinder 200 is opened. The discharge valve 620 is installed to be elastically supported by the spiral discharge valve spring 630 inside the support cap 640 fixed to one end of the cylinder 200. The compressed high-pressure refrigerant is discharged into the discharge cap 660 through a hole formed in the support cap 640, and then discharged to the outside of the linear compressor 100 through the loop pipe L to circulate a refrigeration cycle.

The oil supply assembly 900 is manufactured in the form of a kit, and is installed to be axially supported between the frame 520 and the motor cover 540. Of course, a predetermined elastic member (not shown) such as a leaf spring may be inserted to increase the fastening force when the refueling assembly 900 is mounted. In addition, when the oil supply assembly 900 is mounted, it is in communication with the oil supply passage 520in and the oil return passage 520out provided in the frame 520 to supply oil between the cylinder 200 and the piston 300. It is installed as possible. In this case, the oil supply flow path 520in is provided inside the lower part of the frame 520, while the oil recovery flow path 520out is provided inside the upper part of the frame 520. Therefore, when vibration occurs while the piston 300 reciprocates linearly, the oil supply assembly 900 is operated by the vibration transmitted to the oil supply assembly 900 and the oil stored in the bottom surface of the shell 110 is transferred to the oil supply passage 520 in. ) And the oil recovery flow path 520 out.

4 is a diagram illustrating an example of a frame of the linear compressor according to the present invention. Looking at an example of the frame 520, which is the main part of the present invention, the frame 520 is provided with a mounting hole (not shown), a mounting protrusion 521, an oil discharge hole 520h, a shielding film 522 in a disk shape.

In more detail, the mounting hole of the frame 520 is provided at the center of the frame 520 so that the cylinder 200 (shown in FIG. 3) can be mounted, and the cylinder 200 (shown in FIG. 3) as described above. The frame 520 is die-casted and manufactured integrally. The mounting protrusion 521 of the frame 520 is formed to protrude from one surface of the frame 520 around the mounting hole so that four bolt grooves (not shown) may be provided so that the discharge cap 660 may be bolted. In order to facilitate the discharge of oil, the oil discharge hole 520h is formed so as to be omitted only in the upper portion.

In addition, the oil discharge hole 520h of the frame 520 is provided above the mounting hole 521 so as to communicate with the end of the oil recovery flow path 520out (shown in FIG. 3), and the oil is disposed above one surface of the frame 520. The discharge capacity, but as the compressor capacity increases in recent years, the oil discharge hole 520h including the compression space (P: shown in FIG. 3), the discharge valve 620 (shown in FIG. 3) also increases.

As described above, as the oil recovery passage 520out (shown in FIG. 3) and the oil discharge hole 520h of the frame 520 increase, the oil recovery passage 520out (shown in FIG. 3) and the oil discharge hole of the frame 520 are enlarged. Operation of components such as a piston 300 (shown in FIG. 3), an intake valve 310 (shown in FIG. 3), a discharge valve 620 (shown in FIG. 3), etc., provided inside the frame 520 through 520h. Noise is easily transmitted to the outside through the oil discharge hole 520h of the frame 520. In order to prevent this, the shielding film 522 of the frame 520 is provided to face the oil discharge hole 520h of the frame 520. do. In particular, the shielding film 522 of the frame 520 is installed to shield the opening and closing noise of the discharge valve 620 (shown in FIG. 3) having a relatively high operating noise, and the partition facing the oil discharge hole 520h at a predetermined interval. It is formed into a shape. At this time, the oil discharge hole 520h is provided at the end of the oil recovery flow path 520out (shown in FIG. 3) formed to be inclined inside the frame 520 to the outside of the frame 520 through the oil discharge hole 520h. The transmitted noise is transmitted in an inclined direction, which is an extension of the oil recovery flow path 520out, and the shielding film 522 of the frame 520 is an oil recovery flow path 520out to block the noise transmitted in the inclined direction. It may be configured to block the surface perpendicular to the direction of 3), or to block the front and the upper surface with respect to the oil discharge hole (520h).

Therefore, referring to FIGS. 3 and 4, when the piston 300 reciprocates linearly in the cylinder 200, the suction valve 310 and the discharge valve 620 according to the pressure change in the compression space P are changed. Is opened and closed, the refrigerant is sucked into the compression space (P) as the suction valve 310 is opened, and then the suction valve 310 and the discharge valve 620 is compressed in a closed state. Thereafter, the refrigerant compressed at a high pressure in the compression space P is repeatedly discharged through the loop pipe L as the discharge valve 620 is opened. In addition, when vibration is transmitted from the cylinder 200 and the piston 300 to the oil supply assembly 900, the oil supply assembly 900 pumps oil at the bottom of the shell 110, and the oil thus pumped is an oil supply flow path. Lubricate / cool while passing through the gap between the cylinder 200 and the piston 300 after passing through 520in, and then exit through the oil discharge passage 520out to the oil discharge hole 520h to cover one surface of the frame 520. As it flows down, it is recovered to the bottom surface of the shell 110. Of course, if the oil is not pumped under conditions such as initial operation or low speed operation, the opening and closing noise of the relatively large discharge valve 620 is greatly transmitted through the oil return passage 520out and the oil discharge hole 520h, and the oil is pumped. Even though the oil recovery flow path 520out and the oil discharge hole 520h are not completely blocked, the noise of opening and closing the relatively noisy discharge valve 620 is transmitted, and the shielding film 522 of the frame 520 is the oil discharge hole 520h. It can be reduced by shielding the noise transmitted through the), the oil discharged through the oil discharge hole (520h) can also be guided to flow along one surface of the frame 520 while hitting.

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.

1 is a view showing an example of a linear compressor according to the prior art.

2 is a view showing an example of a frame of a linear compressor according to the prior art.

3 shows an example of a linear compressor according to the invention.

4 is a view showing an example of a frame of the linear compressor according to the present invention.

<Explanation of symbols on main parts of the drawings>

200: cylinder 300: piston

520: frame 520h: oil discharge hole

521: mounting projection 522: shielding film

660: discharge cap

Claims (3)

A frame having a mounting hole; A cylinder having one end fixed to the mounting hole of the frame and having a compression space therein compressed therein; A piston for compressing the refrigerant while reciprocating linear motion inside the cylinder; An oil circulation passage provided inside the frame and circulating oil into a space between the cylinder and the piston; An oil discharge hole through which oil is discharged to communicate with an oil circulation passage on one surface of the frame; And, And a shielding film disposed at a predetermined interval from the oil discharge hole and reducing noise transmitted to the outside through the oil discharge hole. The method of claim 1, The shielding film is a linear compressor, characterized in that installed so as to face the discharge direction of the oil. The method of claim 1, The shielding film is a linear compressor, characterized in that the injection molding integrally on one side of the frame.

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