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WO-2026095104-A1 - LINEAR COMPRESSOR

WO2026095104A1WO 2026095104 A1WO2026095104 A1WO 2026095104A1WO-2026095104-A1

Abstract

The present invention relates to a linear compressor. The linear compressor according to an embodiment of the present invention comprises: a first discharge cover forming a discharge chamber for refrigerant discharged through a discharge valve; a second discharge cover, coupled to the first discharge cover, forming a discharge chamber for the refrigerant discharged from the discharge chamber; and a third discharge cover fixing the second discharge cover to a frame, wherein the third discharge cover comprises: a cover main body forming an insertion space into which a portion of the second discharge cover is inserted; and a terminal protection part extending radially from the cover main body to protect a terminal part.

Inventors

  • KIM, JUNGHAE
  • LEE, KYEONGWEON
  • NAM, JINWOO

Assignees

  • 엘지전자 주식회사

Dates

Publication Date
20260507
Application Date
20241030

Claims (20)

  1. A cylinder having a piston inserted therein that reciprocates axially and forms a compression space; A frame positioned outside the above cylinder; A discharge valve for discharging the refrigerant compressed in the above compression space; A first discharge cover forming a discharge chamber for the refrigerant discharged through the above discharge valve; A second discharge cover coupled to the first discharge cover and forming a discharge chamber for the refrigerant discharged from the discharge chamber; and It includes a third discharge cover that fixes the second discharge cover to the frame, and The above third discharge cover is, A cover body forming an insertion space into which a part of the second discharge cover is inserted; and A linear compressor including a terminal protection member that extends radially from the above cover body and protects the terminal part.
  2. In paragraph 1, The first discharge cover, the second discharge cover, and the third discharge cover are each linear compressors that are supported to be in contact with the frame.
  3. In paragraph 1, The first discharge cover is disposed inside the second discharge cover, and The above third discharge cover is a linear compressor disposed outside the above second discharge cover.
  4. In paragraph 3, A linear compressor in which the first discharge cover is press-fitted to the second discharge cover and the third discharge cover is fastened to the frame by a fastening member.
  5. In paragraph 4, The above third discharge cover is a linear compressor composed of a material different from the material of the above first and second discharge covers.
  6. In paragraph 5, The first discharge cover and the second discharge cover are made of a non-metallic material, and A linear compressor in which the above frame and the above third discharge cover are made of metal material.
  7. In paragraph 6, A linear compressor in which at least one of the first discharge cover and the second discharge cover is made of a plastic material.
  8. In paragraph 6, The above third discharge cover is a linear compressor made of aluminum.
  9. In paragraph 1, The above third discharge cover is, A linear compressor further comprising a cover flange that extends radially outward from the cover body and is fastened to the frame.
  10. In Paragraph 9, The above cover flanges are formed in multiple spaced-apart locations along the circumferential direction on the outer surface of the cover body, and A linear compressor in which a fastening hole is formed in each of the above-mentioned plurality of cover flanges to be fastened to the frame by a fastening member.
  11. In Paragraph 9, The above terminal protection part extends radially outward from the cover body and is connected to the cover flange, forming a linear compressor.
  12. In Paragraph 11, The above terminal protection unit is, A terminal cover portion extending radially outward from the outer surface of the above cover body and covering one side of the above terminal portion; and A linear compressor comprising a terminal leg extending from the edge of the terminal cover portion and covering the other side of the terminal portion.
  13. In Paragraph 12, A linear compressor in which a power line receiving space is formed in the terminal leg to receive a power line extending from the terminal section.
  14. In Paragraph 13, A linear compressor having a sealing member for fixing the power line between the terminal leg and the frame.
  15. In Paragraph 14, The above sealing member is a linear compressor fitted into the inner side of the power line receiving space.
  16. In Paragraph 9, A linear compressor comprising a third discharge cover that extends radially outward from the cover body and further includes a cover bracket positioned to face the terminal protection part.
  17. In Paragraph 16, The above cover bracket is a linear compressor that protrudes radially further than the cover flange from the outer surface of the cover body.
  18. A cylinder having a piston inserted therein that reciprocates axially and forms a compression space; A frame disposed outside the above cylinder and made of a metal material; A discharge valve for discharging the refrigerant compressed in the above compression space; A discharge cover body forming a discharge chamber for the refrigerant discharged through the above discharge valve; It includes a discharge cover flange that fastens the discharge cover body to the frame, and The discharge cover body is supported to be in contact with the frame and is composed of a non-metallic material to reduce the amount of heat transfer from the discharge cover body to the frame, and A linear compressor in which the discharge cover flange is made of a metal material to prevent poor connection with the frame due to thermal deformation.
  19. In Paragraph 18, The above discharge cover body is made of plastic material, and The above discharge cover flange is a linear compressor made of aluminum.
  20. In Paragraph 18, The above discharge cover flange is, A cover body forming an insertion space into which a part of the discharge cover body is inserted; and A linear compressor comprising a terminal protection member that extends radially outward from the above cover body and protects the terminal portion.

Description

Linear compressor The present invention relates to a linear compressor. In a reciprocating compressor, a compression space for compressing the working gas is formed between the piston and the cylinder, and the piston compresses the refrigerant introduced into the compression space as it moves in a straight line back and forth inside the cylinder. Recently, among the aforementioned reciprocating compressors, many linear compressors have been developed that are simple in structure and can improve compression efficiency without mechanical losses occurring when converting the motor's rotational motion into linear motion, by directly connecting the piston to a drive motor that performs reciprocating linear motion. Generally, a linear compressor is configured such that a piston moves in a reciprocating linear motion inside a cylinder driven by a linear motor within a sealed shell, drawing in and compressing refrigerant, and then discharging it. The high-temperature refrigerant compressed in the compression space of the cylinder can flow toward the discharge cover via the discharge valve. The discharge cover is coupled to a frame supporting the cylinder and can form a discharge chamber through which the high-temperature discharge gas flows. The above-mentioned high-temperature discharge gas transfers a certain amount of heat to the frame through the discharge cover, and the transferred heat becomes a factor that raises the temperature of the refrigerant (hereinafter referred to as the suction temperature) sucked into the compression space of the cylinder. If the aforementioned suction temperature increases, the volume of refrigerant per unit mass—that is, the specific volume of the refrigerant—increases, leading to a decrease in volumetric efficiency. Consequently, this can result in a problem where the compression efficiency of the compressor decreases. Therefore, it is necessary to reduce the amount of heat transferred from the discharge cover to the frame. In addition, the discharge cover may be composed of multiple discharge covers arranged to be stacked or in contact with one another. However, there is a problem in that significant vibration and noise are generated due to the pulsation of the refrigerant as it passes through the multiple discharge covers. Korean Registered Patent Publication No. 10-2357601 (January 26, 2022), Title of Invention: Linear Compressor FIG. 1 is a cross-sectional view of a linear compressor according to an embodiment of the present invention. Figure 2 is a cross-sectional view taken along 2-2 of Figure 1. FIG. 3 is an upper perspective view of a discharge cover assembly according to an embodiment of the present invention. FIG. 4 is a plan view of a discharge cover assembly according to an embodiment of the present invention. FIG. 5 is a lower perspective view of a discharge cover assembly according to an embodiment of the present invention. FIG. 6 is an upper perspective view of a second discharge cover according to an embodiment of the present invention. FIG. 7 is a plan view of a second discharge cover according to an embodiment of the present invention. FIG. 8 is a lower perspective view of a second discharge cover according to an embodiment of the present invention. FIG. 9 is a bottom view of a second discharge cover according to an embodiment of the present invention. FIG. 10 is an upper perspective view of a third discharge cover according to an embodiment of the present invention. FIG. 11 is a plan view of a third discharge cover according to an embodiment of the present invention. FIG. 12 is a lower perspective view of a third discharge cover according to an embodiment of the present invention. FIG. 13 is a bottom view of a third discharge cover according to an embodiment of the present invention. FIG. 14 is a bottom view showing the second discharge cover and the third discharge cover combined according to an embodiment of the present invention. FIG. 15 is a side view showing the frame and discharge cover assembly combined according to an embodiment of the present invention. FIG. 16 is a cross-sectional view showing the configuration of a discharge cover assembly according to an embodiment of the present invention. FIG. 17 is a cross-sectional view showing the appearance of a refrigerant flowing through the discharge chamber of a discharge cover assembly according to an embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed