KR20090041717A - Discharge valve for linear compressor - Google Patents

Abstract

A discharge valve of a linear compressor is provided to reduce the weight while ensuring the strength by dispersing stress through weight reduction holes arranged uniformly. A discharge valve of a linear compressor comprises a mounting part(621) protruded in the center, an extension part(622) formed in the radial direction of the central part, and a rim part(623). In a mounting part, a discharge valve spring is mounted. The extension part is extended to be thinner from the central part, and includes a plurality of weight reduction grooves(622a~622e). The rim part is formed at the specific thickness along the circumference of the extension part.

Description

Discharge Valve for Linear Compressor {DISCHARGE VALVE FOR LINEAR COMPRESSOR}

The present invention relates to a discharge valve of a linear compressor, and more particularly, to a discharge valve of a linear compressor capable of securing strength and reducing materials.

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 linear motor (6), and a motor cover (7) inside a shell (not shown). ), The supporter 8, the main body cover 9, the main springs (S1, S2), the structure consisting of the muffler assembly 10 is installed to elastically support.

The cylinder 2 is fitted to the frame 1 so that the discharge valve assembly 5 composed of the discharge valve 5a, the discharge cap 5b, and the discharge valve spring 5c blocks one end of the cylinder 2. On the other hand, the piston 3 is inserted inside the cylinder 2, and a thin suction valve 4 is installed to open and close the outlet 3a of the piston 2.

The linear motor 6 is installed so that the permanent magnet 6c can reciprocally linearly move while maintaining a gap between the inner stator 6a and the outer stator 6b, and the permanent magnet 6c is connected by the connecting member 6d. It is installed to be connected to the piston (3), and operates the piston (3) while the permanent magnet (6c) reciprocating linear movement by mutual electromagnetic force between the inner stator (6a), the outer stator (6b) and the permanent magnet (6c) .

The motor cover 7 supports the outer stator 6b in the axial direction to fix the outer stator 6b and is bolted to the frame 1, and the body cover 9 is coupled to the motor cover 7. A supporter 8 connected to the other end of the piston 3 is installed between the motor cover 7 and the main body cover 9 so as to be elastically supported in the axial direction by the main springs S1 and S2, and sucks the refrigerant. Muffler assembly 10 is also fastened together with the supporter (8).

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 relative to the supporter (8), the linear motor (6) As it is actuated, the front springs S1 and the rear springs S2 behave in opposite directions while cushioning the piston 3 and the supporter 8. 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 8.

Therefore, when the linear motor 6 is operated, the piston 3 and the muffler assembly 10 connected thereto are reciprocated linearly, and the suction valve 4 and the discharge valve assembly are changed as the pressure of the compression space P is varied. The operation of (5) is automatically adjusted, and by this operation, the refrigerant is compressed past the suction pipe on the shell side, the opening of the body cover 9, the muffler assembly 10, and the suction ports 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.

2 is a view showing an example of the discharge valve of the linear compressor according to the prior art. An example of the conventional discharge valve 5a is made of a peak material, which is a kind of high-strength plastic, to withstand the high pressure inside the compression space P (shown in FIG. 1), and its shape is also formed thicker toward the center. . While the discharge valve 5a is formed to be flat on one surface, one surface of the opposite direction is formed to be convex toward the center to prevent the discharge valve 5a from bending even when excessive pressure is applied. Of course, the flat one surface of the discharge valve 5a is installed to abut one end of the cylinder 2 (shown in FIG. 1) on the side of the compression space P (shown in FIG. 1), while the convex surface of the discharge valve 5a is discharged. It is elastically supported by a valve spring 5b (shown in FIG. 1).

3 is a graph illustrating efficiency and noise according to a discharge valve weight of a linear compressor, in general, as the weight of the discharge valve increases, the impact force that the discharge valve and the cylinder collide with increases, while the noise increases, while the compression efficiency decreases. It can be seen that. Therefore, the smaller the weight of the discharge valve, the lower the material cost and the better the noise performance, while ensuring the predetermined strength because the weight of the discharge valve cannot be excessively reduced to ensure the strength of the discharge valve in contact with the high-pressure compression space. It is preferable to reduce the weight of the discharge valve within the range.

However, even if the discharge valve of the linear compressor according to the prior art is made of a high-strength plastic, such as expensive peak material is formed thicker toward the center to ensure the strength, the production cost increases as the weight increases, operating in proportion to the weight In addition, the noise generated at the time of increase, as well as the compression efficiency is lowered, and as the capacity of the linear compressor increases recently, as the discharge valve is also larger, the above problems become larger.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a discharge valve of a linear compressor that can reduce the weight while ensuring strength by changing the shape.

According to an aspect of the present invention, there is provided a discharge valve of a linear compressor that is elastically supported in an axial direction by a discharge valve spring and opens and closes a compression space formed between a cylinder and a piston, the center of which a discharge valve spring is seated; An expansion part extended to be thin in the radial direction of the central part and having a plurality of weight reducing grooves; And, it provides a discharge valve of the linear compressor comprising a; rim portion having a constant thickness along the circumferential direction of the expansion portion.

Further, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves are characterized in that they are uniformly arranged in the expansion portion.

In addition, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves may be arranged in a molecular form in which at least two weight reducing grooves are formed in a predetermined section in the circumferential direction.

In addition, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves are characterized in that arranged radially to the expansion portion with respect to the center.

Further, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves are characterized in that the depth is uniformly formed in the extension portion.

Further, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves are characterized by being triangular.

In addition, in the discharge valve of the linear compressor of the present invention, the weight reducing grooves are characterized by a circular shape.

In addition, in the discharge valve of the linear compressor of the present invention, four adjacent weight reducing grooves are arranged in a rhombus shape.

Since the discharge valve of the linear compressor according to the present invention configured as described above has weight reducing holes arranged in a uniform form so as to reduce the weight and disperse the stress, it is possible to ensure the strength and reduce the weight. Therefore, it is possible to reduce the production cost, and at the same time reduce the noise during operation has the advantage of higher compression efficiency.

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

4 is a diagram illustrating 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 a linear motor 400, when the permanent magnet 460 linearly reciprocates by mutual electromagnetic force between the inner stator 420 and the outer stator 440, the piston 300 connected to the permanent magnet 460 is permanent Linear reciprocating motion with the magnet 460.

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. 4 shows 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, thereby reducing noise during refrigerant 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.

Each component of the linear compressor 100 described above is supported by the front support spring 120 and the rear support spring 140 in an assembled state, and is spaced apart from the bottom of the shell 110. Since it is not in direct contact with the bottom of the shell 110, the vibration generated in the components of the compressor 100 while compressing the refrigerant is not transmitted directly to the shell (110). Therefore, the noise generated by the vibration transmitted to the outside of the shell 100 and the vibration of the shell 110 can be reduced.

5 is a view showing a first embodiment of the discharge valve of the linear compressor according to the present invention. The discharge valve 620 according to the first embodiment has a thickness as it extends in the radial direction of the seating portion 621 and the seating portion 621 protruding from the center so that the discharge valve spring 630 (shown in FIG. 4) is seated. Is formed to have a uniform thickness in the circumferential direction of the expansion portion 622 is provided with a plurality of weight reducing grooves (622a, 622b, 622c, 622d, 622e) is thin and uniformly arranged Compression space (P: shown in Figure 4) is composed of the edge portion 623 is supported the pressure difference between the inside / outside, the weight reducing grooves (622a, 622b, 622c, 622d, 622e) are partitions arranged in a kind of molecular form By this, the molecular structure M is formed and the molecular structure M is constantly arranged in the circumferential direction. Of course, one side of the discharge valve 620 is in contact with the compression space is formed flat, while the thickness is formed thicker toward the other surface on which the discharge valve spring 630 (shown in Figure 4) is seated, the weight reducing grooves As 622a, 622b, 622c, 622d, and 622e are provided, the weight can be reduced.

At this time, the molecular structure (M) is divided by the partition to have four triangular weight reducing grooves (622a, 622b, 622c, 622d) and one rectangular weight reducing groove (622e), the extension of the 622 Even if the thickness varies depending on the position, the depth of the weight reducing grooves 622a, 622b, 622c, 622d, and 622e formed in the extension 622 is preferably formed uniformly. Further, even if the weight reducing grooves 622a, 622b, 622c, 622d, and 622e are formed in the discharge valve 620, the vertex portion of the weight reducing grooves 622a, 622b, 622c, 622d, and 622e to ensure the strength, that is, For example, the portion where the partition walls cross each other is preferably formed in a cylindrical shape thicker than other partition portions.

The discharge valve 620 may be injection molded from a high strength plastic material such as a peak.

6 is a view showing a second embodiment of the discharge valve of the linear compressor according to the present invention. The discharge valve 1620 according to the second embodiment is composed of a seating portion 1621, an expansion portion 1622, the edge portion 1623, as in the first embodiment, the weight reducing grooves 1622a, 1622b, 1622c, 1622d and 1622e are arranged in a radial shape in the expansion portion 1622 based on the seating portion 1621 in a circular shape, the depth is formed uniformly.

At this time, the weight reducing grooves 1622a, 1622b, 1622c, 1622d, and 1622e are arranged to increase in number in the form of a pyramid from the seating portion 1621 to the edge portion 1623, and four adjacent weight reducing grooves 1622a. , 1622b, 1622c, 1622d, and 1622e can be regarded as a kind of rhombic molecular structure (M).

Like the first embodiment, the discharge valve 1620 is injection molded from a high-strength plastic material such as a peak, but the structure is simpler than that of the first embodiment, so that the injection valve is easy and the mold shape is simple. The life of the mold can be increased.

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 discharge valve of a linear compressor according to the prior art.

Figure 3 is a graph showing the efficiency and noise according to the discharge valve weight of the linear compressor in general.

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

Figure 5 is a view showing a first embodiment of the discharge valve of the linear compressor according to the present invention.

Figure 6 is a view showing a second embodiment of the discharge valve of the linear compressor according to the present invention.

<Explanation of symbols on main parts of the drawings>

100: linear compressor 200: cylinder

300: piston 400: linear motor

620: discharge valve 630: discharge valve spring

640: support cap 660: discharge cap

Claims (8)

A discharge valve of a linear compressor that is elastically supported in an axial direction by a discharge valve spring and opens and closes a compression space formed between a cylinder and a piston, A center in which the discharge valve spring is seated; An expansion part extended to be thin in the radial direction of the central part and having a plurality of weight reducing grooves; And, Discharge valve of a linear compressor comprising a; rim portion having a constant thickness along the circumferential direction of the expansion portion. The method of claim 1, Discharge valve of the linear compressor, characterized in that the weight reducing grooves are uniformly arranged in the expansion portion. The method of claim 1, The weight reduction grooves are discharge valves of the linear compressor, characterized in that the expansion unit is arranged in a molecular form formed at least two weight reduction grooves in a predetermined section in the circumferential direction. The method of claim 1, Weight reducing grooves discharge valve of the linear compressor, characterized in that arranged in a radial form on the extension with respect to the center. The method of claim 1, The weight reduction grooves are discharge valves of the linear compressor, characterized in that the depth is formed uniformly. The method according to any one of claims 1 to 5, Discharge valve of the linear compressor, characterized in that the weight reducing grooves are triangular. The method according to any one of claims 1 to 5, Discharge valve of the linear compressor, characterized in that the weight reducing grooves are circular. The method of claim 7, wherein Four adjacent weight-saving grooves are discharge valves of the linear compressor, characterized in that arranged in a rhombus shape.

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