compressor

Abstract

A compressor including a case including an inlet port, and an outlet port; a scroll compressing portion including a fixed scroll inside the case, and an orbiting scroll configured to orbit with respect to the fixed scroll; and a rotary compressing portion including a cylinder inside the case, and a roller configured to rotate along an inner wall of the cylinder inside the cylinder, wherein the case, the scroll compressing portion, and the rotary compressing portion are configured such that a refrigerant flowing into the case through the inlet port passes through the scroll compressing portion, then passes through the rotary compressing portion, and is then discharged to an outside of the case through the outlet port.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation application of International Application No. PCT / KR2025 / 017624, filed on Oct. 30, 2025, which is based on and claims the benefit of Korean Patent Application Number 10-2025-0040670, filed on Mar. 28, 2025, the disclosures of which are incorporated by reference herein in their entireties.TECHNICAL FIELD

[0002] The present disclosure relates to a compressor including an improved structure.BACKGROUND ART

[0003] A compressor is a mechanical device that receives power from a power generation device, such as an electric motor or turbine, to compress air, refrigerant, or other working gases to increase a pressure thereof. The compressor is widely used in home appliances such as a refrigerator, an air conditioner, and a clothes dryer, as well as in industries. The types of compressors include a reciprocating compressor, a scroll compressor, and a rotary compressor.

[0004] The reciprocating compressor forms a compression space, in which a working gas is drawn and discharged, between a piston and a cylinder, to allow the piston to reciprocate linearly in the cylinder so as to compress the working gas.

[0005] The scroll compressor forms a compression space, in which a working gas is drawn and discharged, between an orbiting scroll and a fixed scroll, to allow the orbiting scroll to orbit with respect to the fixed scroll so as to compress the working gas.

[0006] The rotary compressor forms a compression space, in which a working gas is drawn and discharged, between a roller that rotates eccentrically and a cylinder, to allow the roller to eccentrically rotate along an inner wall of the cylinder so as to compress the working gas.DISCLOSURETechnical Problem

[0007] The present disclosure is directed to providing a two-stage compressor including a scroll compressing portion and a rotary compressing portion.

[0008] Further, the present disclosure is directed to providing a compressor capable of primarily compressing a refrigerant through a scroll compressing portion and secondarily compressing a refrigerant through a rotary compressing portion.

[0009] Technical tasks to be achieved in this document are not limited to the technical tasks mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art from the description below.Technical Solution

[0010] Aspects of embodiments of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

[0011] According to an embodiment of the disclosure, a compressor includes a case including an inlet port, and an outlet port; a scroll compressing portion including a fixed scroll inside the case, and an orbiting scroll configured to orbit with respect to the fixed scroll; and a rotary compressing portion including a cylinder inside the case, and a roller configured to rotate along an inner wall of the cylinder inside the cylinder, wherein the case, the scroll compressing portion, and the rotary compressing portion are configured such that a refrigerant flowing into the case through the inlet port passes through the scroll compressing portion, then passes through the rotary compressing portion, and is then discharged to an outside of the case through the outlet port.

[0012] According to an embodiment of the disclosure, the compressor may further include a connecting pipe including a refrigerant inlet portion to receive a refrigerant compressed by the scroll compressing portion, and a refrigerant outlet portion to discharge the refrigerant received by the refrigerant inlet portion to the rotary compressing portion.

[0013] According to an embodiment of the disclosure, the connecting pipe may be coupled to an outer surface of the case.

[0014] According to an embodiment of the disclosure, the compressor may further include a frame dividing an internal space of the case into a first receiving space to receive a refrigerant discharged by the scroll compressing portion, and a second receiving space to receive a refrigerant discharged by the rotary compressing portion.

[0015] According to an embodiment of the disclosure, the first receiving space may be above the second receiving space.

[0016] According to an embodiment of the disclosure, the compressor may further include a drive motor configured to drive at least one of the scroll compressing portion and the rotary compressing portion. The drive motor may be in the second receiving space.

[0017] According to an embodiment of the disclosure, the outlet port may be above the drive motor, and may communicate with the second receiving space.

[0018] According to an embodiment of the disclosure, the frame may support the scroll compressing portion. At least a portion of the frame may be under a lower side of the orbiting scroll.

[0019] According to an embodiment of the disclosure, the compressor may further include a sealing member between an outer surface of the frame and an inner surface of the case.

[0020] According to an embodiment of the disclosure, the compressor may further include an inlet pipe penetrating the inlet port. The scroll compressing portion may include a compression space in which the refrigerant passing through the scroll compressing portion is compressed. The inlet pipe may communicate with the compression space.

[0021] According to an embodiment of the disclosure, the case may include a main body, and a top cover on an upper side of the main body. The frame may include a protrusion protruding from an outer surface of the frame. At least a portion of the protrusion may be inserted between the main body and the top cover.

[0022] According to an embodiment of the disclosure, the protrusion may be welded to the main body and the top cover.

[0023] According to an embodiment of the disclosure, the frame supporting the scroll compressing portion may be a first frame. The compressor may further include a second frame surrounding at least a portion of the fixed scroll so as to support the scroll compressing portion.

[0024] According to an embodiment of the disclosure, the inlet port may be a first inlet port that communicates with the scroll compressing portion. The refrigerant discharged through the outlet port may flow to a condenser. The compressor may further include a second inlet port configured to receive a gaseous refrigerant among refrigerants that pass through the condenser. The second inlet port may communicate with the first receiving space.

[0025] According to an embodiment of the disclosure, the refrigerant discharged through the outlet port may flow to a condenser. The connecting pipe may include an inlet pipe provided to receive a gaseous refrigerant among refrigerants that pass through the condenser.

[0026] Another aspect of the present disclosure provides a compressor including: a case including: an inlet port and an outlet port; a scroll compressing portion including: a fixed scroll disposed inside the case; and an orbiting scroll configured to orbit with respect to the fixed scroll; and a rotary compressing portion including: a cylinder disposed inside the case; and a roller configured to rotate along an inner wall of the cylinder inside the cylinder. Based on a refrigerant flow path extending from the inlet port to the outlet port, the scroll compressing portion is disposed upstream of the rotary compressing portion.DESCRIPTION OF DRAWINGS

[0027] These and / or other aspects of the disclosure will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings listed below.

[0028] FIG. 1 illustrates a refrigerant flow path of a refrigeration cycle device according to an embodiment of the disclosure.

[0029] FIG. 2 is a perspective view illustrating a compressor according to an embodiment of the disclosure.

[0030] FIG. 3 is a cross-sectional view of the compressor according to an embodiment of the disclosure.

[0031] FIG. 4 is an exploded view of some components of the compressor according to an embodiment of the disclosure.

[0032] FIG. 5 is an exploded view of a scroll compressing portion according to an embodiment of the disclosure.

[0033] FIG. 6 is an exploded view of the scroll compressing portion according to an embodiment of the disclosure.

[0034] FIG. 7 is an exploded view of a rotary compressing portion according to an embodiment of the disclosure.

[0035] FIG. 8 is a cross-sectional view of the compressor according to an embodiment of the disclosure.

[0036] FIG. 9 is an enlarged view of a region A shown in FIG. 8.

[0037] FIG. 10 is an enlarged view of a portion of a cross-section of a compressor according to an embodiment of the disclosure.

[0038] FIG. 11 is a cross-sectional view of a compressor according to an embodiment of the disclosure.

[0039] FIG. 12 is a cross-sectional view of a compressor according to an embodiment of the disclosure.

[0040] FIG. 13 illustrates a refrigerant flow path of a refrigeration cycle device according to an embodiment of the disclosure.

[0041] FIG. 14 is a cross-sectional view of a compressor according to an embodiment of the disclosure.

[0042] FIG. 15 is a cross-sectional view of a compressor according to an embodiment of the disclosure.MODES OF THE INVENTION

[0043] The various embodiments and the terms used therein are not intended to limit the technology disclosed herein to specific forms, and the disclosure should be understood to include various modifications, equivalents, and / or alternatives to the corresponding embodiments.

[0044] In describing the drawings, similar reference numerals may be used to designate similar constituent elements.

[0045] A singular expression may include a plural expression unless otherwise indicated herein or clearly contradicted by context.

[0046] The expressions “A or B,”“at least one of A or / and B,” or “one or more of A or / and B,” A, B or C,”“at least one of A, B or / and C,” or “one or more of A, B or / and C,” and the like used herein may include any and all combinations of one or more of the associated listed items.

[0047] The term of “and / or” includes a plurality of combinations of relevant items or any one item among a plurality of relevant items.

[0048] Herein, the expressions “a first”, “a second”, “the first”, “the second”, etc., may simply be used to distinguish an element from other elements, but is not limited to another aspect (importance or order) of elements.

[0049] In this disclosure, the terms “including”, “having”, and the like are used to specify features, numbers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more of the features, elements, steps, operations, elements, components, or combinations thereof.

[0050] When an element is said to be “connected”, “coupled”, “supported” or “contacted” with another element, this includes not only when elements are directly connected, coupled, supported or contacted, but also when elements are indirectly connected, coupled, supported or contacted through a third element.

[0051] Throughout the description, when an element is “on” another element, this includes not only when the element is in contact with the other element, but also when there is another element between the two elements.

[0052] In the following detailed description, the terms of “front surface”, “rear surface”, “upper surface”, “lower surface”, “side surface”, “left side”, “right side”, “upper portion”, “lower portion” and the like may be defined by the drawings, but the shape and the location of the element is not limited by the term.

[0053] Hereinafter exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0054] FIG. 1 illustrates a refrigerant flow path of a refrigeration cycle device according to one embodiment.

[0055] Referring to FIG. 1, a refrigeration cycle device may include a compressor 1, a condenser 2, an expansion device 3, and an evaporator 4. The compressor 1, the condenser 2, the expansion device 3, and the evaporator 4 may form a closed cycle.

[0056] The compressor 1 may be configured to compress a refrigerant. The refrigerant in a gaseous state compressed at high temperature and high pressure in the compressor 1 may sequentially pass through the condenser 2, the expansion device 3, and the evaporator 4 and then be introduced back into the compressor 1.

[0057] The condenser 2 may be configured to condense a refrigerant discharged from the compressor 1. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 may release heat to the outside while passing through the condenser 2, thereby increasing the outside temperature, and then the refrigerant may be liquefied.

[0058] The expansion device 3 may be configured to expand the refrigerant discharged from the condenser 2. A density and pressure of the refrigerant discharged from the condenser 2 may be greatly reduced as the refrigerant passes through the expansion device 3. Accordingly, the refrigerant may be changed into a saturated vapor state in which a pressure thereof is reduced to a state in which it is easy to evaporate in the evaporator 4.

[0059] The evaporator 4 may be configured to evaporate the refrigerant introduced from the expansion device 3. The refrigerant discharged from the expansion device 3 may absorb heat from the outside while passing through the evaporator 4, thereby lowering the outside temperature and then the refrigerant may be vaporized.

[0060] The refrigerant discharged from the evaporator 4 may be in a low-temperature and low-pressure gaseous state. The refrigerant discharged from the evaporator 4 may be compressed to a high-temperature and high-pressure state as the refrigerant is introduced again into the compressor 1.

[0061] The refrigeration cycle device may include a plurality of transfer pipes for connecting the compressor 1, the condenser 2, the expansion device 3, and the evaporator 4 to each other. Each of the plurality of transfer pipes may be provided to transfer a refrigerant. Particularly, the plurality of transfer pipes may include a first transfer pipe P1 connecting the compressor 1 and the condenser 2, a second transfer pipe P2 connecting the condenser 2 and the expansion device 3, a third transfer pipe P3 connecting the expansion device 3 and the evaporator 4, and a fourth transfer pipe P4 connecting the evaporator 4 and the compressor 1.

[0062] FIG. 2 is a perspective view illustrating a compressor according to one embodiment. FIG. 3 is a cross-sectional view of the compressor according to one embodiment. FIG. 4 is an exploded view of some components of the compressor according to one embodiment. FIG. 5 is an exploded view of a scroll compressing portion according to one embodiment. FIG. 6 is an exploded view of the scroll compressing portion according to one embodiment. FIG. 7 is an exploded view of a rotary compressing portion according to one embodiment.

[0063] Referring to FIGS. 2 to 7, the compressor 1 may include a case 10. The case 10 may form a receiving space S for receiving various components of the compressor 1. In other words, the case 10 may form the receiving space S for receiving a refrigerant.

[0064] The case 10 may be provided to receive oil. That is, oil may be stored within the receiving space S. The oil may reduce friction between various members of the compressor 1. In addition, the oil may lubricate various members of the compressor 1.

[0065] The case 10 may include a main body 11. The main body 11 may be formed in a substantially hollow cylindrical shape. The main body 11 may extend in an up and down direction. However, there is no particular limitation on the shape of the main body 11.

[0066] The case 10 may include a top cover 12. The top cover 12 may be disposed on an upper side of the main body 11. The top cover 12 may cover the upper side of the main body 11. The top cover 12 may be coupled to the main body 11.

[0067] The case 10 may include a base 13. The base 13 may be disposed on a lower side of the main body 11. The base 13 may be coupled to the main body 11. The base 13 may support the main body 11 and the top cover 12.

[0068] The case 10 may include an inlet port 14. The inlet port 14 may be provided to introduce a refrigerant. That is, a refrigerant outside the case 10 may be introduced into the receiving space S inside the case 10 through the inlet port 14. Particularly, a refrigerant discharged from the evaporator 4 (refer to FIG. 1) may be provided to be introduced into the compressor 1 through the inlet port 14. For example, the inlet port 14 may be formed in the top cover 12 of the case 10.

[0069] The case 10 may include an outlet port 15. The outlet port 15 may be provided to discharge a refrigerant. That is, the refrigerant received in the receiving space S inside the case 10 may be discharged to the outside of the case 10 through the outlet port 15. Particularly, the refrigerant discharged through the outlet port 15 may be provided to flow to the condenser 2 (refer to FIG. 1). For example, the outlet port 15 may be formed in the main body 11 of the case 10.

[0070] The compressor 1 may include a frame 20. The frame 20 may be provided to partition an internal space of the case 10. In other words, the frame 20 may be provided to partition the receiving space S inside the case 10.

[0071] The frame 20 may divide the receiving space S into a first receiving space S1 and a second receiving space S2. Particularly, the first receiving space S1 and the second receiving space S2 may be divided vertically. For example, the first receiving space S1 may be disposed above the second receiving space S2.

[0072] The inlet port 14 may be formed on one side wall of the case 10 forming the first receiving space S1. Particularly, a refrigerant supplied from the outside of the case 10 may flow into the first receiving space S1 through the inlet port 14, an inlet pipe 40, and a scroll compressing portion 100 described later.

[0073] The outlet port 15 may be formed on one side wall of the case 10 forming the second receiving space S2. The outlet port 15 may communicate with the second receiving space S2. Particularly, a refrigerant inside the second receiving space S2 may be discharged to the outside of the case 10 through the outlet port 15 and an outlet pipe 50 described later.

[0074] The compressor 1 may include the scroll compressing portion 100. The scroll compressing portion 100 may be a device configured to compress a refrigerant through a fixed scroll 110 and an orbiting scroll 120. The scroll compressing portion 100 may form a first compression space C1 for compressing a refrigerant.

[0075] The scroll compressing portion 100 may be disposed inside the case 10. In other words, the scroll compressing portion 100 may be received in the receiving space S. For example, the scroll compressing portion 100 may be received in the first receiving space S1.

[0076] The scroll compressing portion 100 may be configured to discharge the compressed refrigerant into the first receiving space S1. That is, the first receiving space S1 may be provided to receive the refrigerant discharged by the scroll compressing portion 100.

[0077] The scroll compressing portion 100 may be coupled to the frame 20. For example, the scroll compressing portion 100 may be screw-coupled to the frame 20. However, the coupling method of the scroll compressing portion 100 and the frame 20 is not limited thereto.

[0078] The scroll compressing portion 100 may include the fixed scroll 110. The fixed scroll 110 may be disposed inside the case 10. That is, the fixed scroll 110 may be received in the receiving space S. For example, the fixed scroll 110 may be received in the first receiving space S1. The fixed scroll 110 may be fixed to the inside of the case 10.

[0079] The fixed scroll 110 may include a scroll body 111. The scroll body 111 may form an overall appearance of the fixed scroll 110.

[0080] The fixed scroll 110 may include a fixed wrap 112. The fixed wrap 112 may be formed by protruding from a lower surface of the scroll body 111. The fixed wrap 112 may be formed integrally with the scroll body 111. The fixed wrap 112 may be provided in a substantially spiral shape.

[0081] The fixed scroll 110 may include a first refrigerant inlet hole 113. The first refrigerant inlet hole 113 may be provided to introduce a refrigerant into the scroll compressing portion 100. The refrigerant introduced into the scroll compressing portion 100 through the first refrigerant inlet hole 113 may be compressed by the scroll compressing portion 100.

[0082] The first refrigerant inlet hole 113 may be provided in the scroll body 111. For example, the first refrigerant inlet hole 113 may be disposed on an upper surface of the scroll body 111. The first refrigerant inlet hole 113 may communicate with the first compression space C1. The inlet pipe 40, which will be described later, may be coupled to the first refrigerant inlet hole 113.

[0083] The fixed scroll 110 may include a refrigerant outlet hole 114. The refrigerant outlet hole 114 may be provided to discharge a refrigerant from the scroll compressing portion 100. The refrigerant discharged from the scroll compressing portion 100 through the refrigerant outlet hole 114 may flow into the first receiving space S1.

[0084] The refrigerant outlet hole 114 may be disposed in the scroll body 111. For example, the refrigerant outlet hole 114 may be disposed on the upper surface of the scroll body 111. The refrigerant outlet hole 114 may communicate with the first compression space C1. The refrigerant outlet hole 114 may communicate with the first receiving space S1.

[0085] The fixed scroll 110 may include a bypass hole 115. The bypass hole 115 may be provided to bypass the refrigerant introduced into the scroll compressing portion 100. The bypass hole 115 may communicate with the first compression space C1. A plurality of bypass holes 115 may be provided.

[0086] The bypass hole 115 may be disposed in the scroll body 111. Particularly, the bypass hole 115 may be disposed on the upper surface of the scroll body 111.

[0087] The bypass hole 115 may be opened and closed by a bypass device 130 to be described later. Details thereof will be described later.

[0088] The scroll compressing portion 100 may include the orbiting scroll 120. The orbiting scroll 120 may be disposed inside the case 10. That is, the orbiting scroll 120 may be received in the receiving space S. For example, the orbiting scroll 120 may be received in the first receiving space S1. The orbiting scroll 120 may be configured to be rotatable inside the case 10.

[0089] The orbiting scroll 120 may be coupled to a shaft 70 to be described later. The orbiting scroll 120 may rotate as the shaft 70 rotates.

[0090] The orbiting scroll 120 may be disposed on a lower side of the fixed scroll 110. The orbiting scroll 120 may be configured to orbit with respect to the fixed scroll 110.

[0091] The orbiting scroll 120 may include a first base plate 121. The first base plate 121 may cover the lower side of the scroll body 111.

[0092] The orbiting scroll 120 may include an orbiting wrap 122. The orbiting wrap 122 may be formed to protrude from an upper surface of the first base plate 121. The orbiting wrap 122 may be formed integrally with the first base plate 121. The orbiting wrap 122 may be formed in a substantially spiral shape.

[0093] The orbiting wrap 122 may be engaged with the fixed wrap 112. As the orbiting scroll 120 rotates, the orbiting wrap 122 may rotate while being engaged with the fixed wrap 112.

[0094] The orbiting wrap 122 may form the first compression space C1 together with the scroll body 111, the first base plate 121, and the fixed wrap 112. As the orbiting scroll 120 rotates, the refrigerant received in the first compression space C1 may be compressed. Particularly, as the orbiting scroll 120 rotates, a space between the orbiting wrap 122 and the fixed wrap 112 may contract, and thus, the refrigerant received in the space between the orbiting wrap 122 and the fixed wrap 112 may be gradually compressed. The compressed refrigerant may be discharged through the refrigerant outlet hole 114 of the scroll body 111.

[0095] The orbiting scroll 120 may include a shaft coupling portion 123. The shaft coupling portion 123 may extend downward from the first base plate 121. The shaft coupling portion 123 may be rotatably coupled to the shaft 70 to be described later. Particularly, the shaft coupling portion 123 may be rotatably coupled to a first cam 72 of the shaft 70 to be described later. The shaft coupling portion 123 may function as a bearing.

[0096] The scroll compressing portion 100 may include the bypass device 130. The bypass device 130 may be configured to bypass a refrigerant introduced into the scroll compressing portion 100 by selectively opening and closing the bypass hole 115. Particularly, when a pressure of the first compression space C1 is greater than that of the first receiving space S1 or a predetermined target pressure due to the refrigerant introduced into the scroll compressing portion 100, the bypass device 130 may open the bypass hole 115 to bypass a portion of the refrigerant received in the first compression space C1. For example, when the refrigerant introduced into the scroll compressing portion 100 contains a large amount of liquid refrigerant and the pressure in the first compression space C1 is greater than that of the first receiving space S1 or the predetermined target pressure, the bypass device 130 may open the bypass hole 115 to bypass a portion of the refrigerant received in the first compression space C1. With this configuration, the pressure in the first compression space C1 may be maintained at a predetermined level or less.

[0097] The bypass device 130 may be disposed on the upper side of the fixed scroll 110. Particularly, the bypass device 130 may be disposed on the upper surface of the scroll body 111.

[0098] The bypass device 130 may include a bypass valve 131. The bypass valve 131 may be configured to open and close the bypass hole 115. Particularly, when the pressure in the first compression space C1 is greater than or equal to the predetermined level, the bypass valve 131 may be opened due to the pressure in the first compression space C1. A plurality of bypass valves 131 may be provided. The number of bypass valves 131 may correspond to the number of bypass holes 115.

[0099] The bypass device 130 may include a bypass valve stopper 132. The bypass valve stopper 132 may be disposed on an upper side of the bypass valve 131. The bypass valve stopper 132 may prevent the bypass valve 131 from moving excessively upward when the bypass valve 131 is opened due to the pressure of the first compression space C1.

[0100] The compressor 1 may include an Oldham's ring 30. The Oldham's ring 30 may be disposed between the frame 20 and the scroll compressing portion 100. Particularly, the Oldham's ring 30 may be disposed between the frame 20 and the orbiting scroll 120. The Oldham's ring 30 may be provided to allow the orbiting scroll 120 to orbit with respect to the fixed scroll 110, but prevent the orbiting scroll from pivoting.

[0101] The compressor 1 may include the inlet pipe 40. The inlet pipe 40 may be provided to introduce a refrigerant from the outside of the compressor 1 into the scroll compressing portion 100. Particularly, the inlet pipe 40 may be provided to allow a refrigerant discharged from the evaporator 4 (refer to FIG. 1) to flow into the scroll compressing portion 100.

[0102] The inlet pipe 40 may be provided to penetrate the inlet port 14. The fourth transfer pipe P4 for transferring a refrigerant discharged from the evaporator 4 (refer to FIG. 1) may be coupled to the inlet pipe 40.

[0103] The inlet pipe 40 may be coupled to the scroll compressing portion 100. Particularly, the inlet pipe 40 may be coupled to the first refrigerant inlet hole 113 of the scroll compressing portion 100. With this configuration, the inlet pipe 40 may communicate with the first compression space C1. In addition, the inlet port 14 may communicate with the first compression space C1 through the inlet pipe 40.

[0104] The compressor 1 may include a rotary compressing portion 200. The rotary compressing portion 200 may be a device configured to compress a refrigerant through a roller 250 configured to rotate within a cylinder 210. The rotary compressing portion 200 may form a second compression space C2 for compressing the refrigerant.

[0105] The rotary compressing portion 200 may be disposed inside the case 10. In other words, the rotary compressing portion 200 may be received in the receiving space S. For example, the rotary compressing portion 200 may be received in the second receiving space S2. That is, the rotary compressing portion 200 may be disposed under the scroll compressing portion 100.

[0106] The rotary compressing portion 200 may be configured to discharge the compressed refrigerant into the second receiving space S2. That is, the second receiving space S2 may be provided to receive the refrigerant discharged by the rotary compressing portion 200. The refrigerant received in the second receiving space S2 may be discharged to the outside of the case 10 through the outlet port 15 and the outlet pipe 50 described below.

[0107] The rotary compressing portion 200 may include the cylinder 210. The cylinder 210 may be disposed inside the case 10. That is, the cylinder 210 may be disposed in the receiving space S. For example, the cylinder 210 may be disposed in the second receiving space S2. The cylinder 210 may be fixed to the inside of the case 10. The cylinder 210 may be formed in a substantially hollow cylindrical shape.

[0108] The cylinder 210 may include a second refrigerant inlet hole 211. The second refrigerant inlet hole 211 may be provided to introduce a refrigerant into the rotary compressing portion 200. The refrigerant introduced into the rotary compressing portion 200 through the second refrigerant inlet hole 211 may be compressed by the rotary compressing portion 200.

[0109] The second refrigerant inlet hole 211 may be disposed on one side wall of the cylinder 210. The second refrigerant inlet hole 211 may communicate with the second compression space C2. A refrigerant outlet portion 320 of a connecting pipe 300 to be described later may be coupled to the second refrigerant inlet hole 211.

[0110] The rotary compressing portion 200 may include a second base plate 220. The second base plate 220 may be disposed on a lower side of the cylinder 210. The second base plate 220 may cover the lower side of the cylinder 210.

[0111] The rotary compressing portion 200 may include a cylinder cover 230. The cylinder cover 230 may be disposed on an upper side of the cylinder 210. The cylinder cover 230 may cover the upper side of the cylinder 210.

[0112] The cylinder cover 230 may include a cover hole 231. The cover hole 231 may allow the second compression space C2 to communicate with an inside of a muffler 240 to be described later. With this configuration, the refrigerant compressed in the second compression space C2 may flow into the inside of the muffler 240 through the cover hole 231.

[0113] The cylinder cover 230 may include a shaft support 232. The shaft support 232 may extend upward from an upper surface of the cylinder cover 230. The shaft support 232 may be provided to support the shaft 70 to be described later.

[0114] The rotary compressing portion 200 may include the muffler 240. The muffler 240 may be disposed on an upper side of the cylinder cover 230. The muffler 240 may cover the upper side of the cylinder cover 230.

[0115] The muffler 240 may be configured to reduce noise generated when the compressed refrigerant in the second compression space C2 passes through the cylinder 210. In addition, the muffler 240 may be provided to receive the refrigerant discharged from the second compression space C2 through the cover hole 231.

[0116] The muffler 240 may include a muffler hole 241. The muffler hole 241 may be provided to allow the shaft support 232 of the cylinder cover 230 to penetrate therethrough.

[0117] A gap may be formed between the muffler hole 241 and the shaft support 232. The refrigerant inside the muffler 240 may be discharged through the gap. The refrigerant discharged through the gap may flow into the second receiving space S2.

[0118] The cylinder 210, the second base plate 220, the cylinder cover 230, and the muffler 240 may be coupled to each other. For example, the cylinder 210, the second base plate 220, the cylinder cover 230, and the muffler 240 may be screw-coupled to each other. However, the coupling method of the cylinder 210, the second base plate 220, the cylinder cover 230, and the muffler 240 is not limited thereto.

[0119] The rotary compressing portion 200 may include the roller 250. The roller 250 may be disposed inside the cylinder 210. The roller 250 may be configured to rotate along an inner wall of the cylinder 210. The roller 250 may be formed in a substantially hollow cylindrical shape.

[0120] The roller 250 may be coupled to the shaft 70 to be described later. Particularly, the roller 250 may be coupled to a second cam 73 of the shaft 70 to be described later. The roller 250 may rotate as the shaft 70 to be described later rotates.

[0121] The rotary compressing portion 200 may include a vane 260. The vane 260 may be movably coupled to one side wall of the cylinder 210. Particularly, the vane 260 may be movable along a radial direction of the cylinder 210.

[0122] One end of the vane 260 may come into contact with the roller 250. With this configuration, the vane 260 may divide the second compression space C2 into an inlet space C21 into which a refrigerant is introduced, and an outlet space C22 into which the refrigerant is compressed and discharged. The inlet space C21 may communicate with the second refrigerant inlet hole 211, and the outlet space C22 may communicate with the cover hole 231.

[0123] Although not shown in the drawing, an elastic member may be coupled to the other end of the vane 260. With this configuration, one end of the vane 260 may remain in contact with the roller 250 while the roller 250 rotates.

[0124] The vane 260 may form the second compression space C2 together with the cylinder 210, the second base plate 220, the cylinder cover 230, and the roller 250. As the roller 250 rotates, the refrigerant received in the second compression space C2 may be compressed. Particularly, as the roller 250 rotates, a refrigerant may be introduced into the inlet space C21 through the second refrigerant inlet hole 211, and the refrigerant in the outlet space C22 may be compressed. In addition, as the roller 250 further rotates, the refrigerant in the outlet space C22 may sequentially pass through the cover hole 231 and the internal space of the muffler 240 and be discharged into the second receiving space S2. The inlet space C21 may be converted into the outlet space C22. By repeating the above process, the refrigerant may be continuously compressed.

[0125] The rotary compressing portion 200 may include an outlet valve device 270. The outlet valve device 270 may be configured to selectively discharge the refrigerant within the second compression space C2 by selectively opening and closing the cover hole 231. Particularly, when a pressure within the outlet space C22 of the second compression space C2 is greater than or equal to a predetermined level, the outlet valve device 270 may open the cover hole 231 to discharge the refrigerant within the second compression space C2.

[0126] The outlet valve device 270 may be disposed on the upper side of the cylinder cover 230. Particularly, the outlet valve device 270 may be disposed on the upper surface of the cylinder cover 230.

[0127] The outlet valve device 270 may include an outlet valve 271. The outlet valve 271 may be configured to open and close the cover hole 231. Particularly, when the pressure in the outlet space C22 is greater than or equal to the predetermined level, the outlet valve 271 may be opened due to the pressure in the outlet space C22.

[0128] The outlet valve device 270 may include an outlet valve stopper 272. The outlet valve stopper 272 may be disposed on an upper side of the outlet valve 271. The outlet valve stopper 272 may prevent the outlet valve 271 from moving excessively upward when the outlet valve 271 is opened due to the pressure of the outlet space C22.

[0129] The compressor 1 may include the outlet pipe 50. The outlet pipe 50 may be provided to discharge the refrigerant within the second receiving space S2 to the outside of the compressor 1. Particularly, the outlet pipe 50 may be provided to discharge the refrigerant compressed in the compressor 1 to the condenser 2 (refer to FIG. 1).

[0130] The outlet pipe 50 may be provided to penetrate the outlet port 15. In other words, the outlet pipe 50 may be coupled to the outlet port 15. With this configuration, the outlet pipe 50 may communicate with the second receiving space S2. The first transfer pipe P1 for transferring the refrigerant discharged from the compressor 1 to the condenser 2 (refer to FIG. 1) may be coupled to the outlet pipe 50.

[0131] The compressor 1 may include a drive motor 60. The drive motor 60 may be configured to generate power. The drive motor 60 may convert electromagnetic force into mechanical rotational force.

[0132] The drive motor 60 may be configured to drive at least one of the scroll compressing portion 100 and the rotary compressing portion 200. For example, the drive motor 60 may be configured to drive both the scroll compressing portion 100 and the rotary compressing portion 200.

[0133] The drive motor 60 may be disposed inside the case 10. In other words, the drive motor 60 may be received in the receiving space S. Particularly, the drive motor 60 may be received in the second receiving space S2.

[0134] The drive motor 60 may be disposed between the rotary compressing portion 200 and the outlet port 15 in the up and down direction. That is, the rotary compressing portion 200 may be disposed under the drive motor 60, and the outlet port 15 may be disposed above the drive motor 60. Accordingly, the refrigerant discharged from the rotary compressing portion 200 may pass through the drive motor 60 and flow toward the outlet port 15. At this time, the drive motor 60 may be cooled by the refrigerant passing through the drive motor 60.

[0135] The drive motor 60 may include a stator 61. The stator 61 may be fixed to the inside of the case 10. The stator 61 may include a stator core and a coil wound around the stator core.

[0136] The drive motor 60 may include a rotor 62. The rotor 62 may be configured to be rotatable relative to the stator 61. The rotor 62 may include a plurality of magnets.

[0137] In the drawings, an inner rotor type drive motor 60 in which the rotor 62 is arranged inside the stator 61 is illustrated, but the present disclosure is not limited thereto. The drive motor 60 may also be an outer rotor type in which the rotor 62 is arranged outside the stator 61. That is, there is no particular limitation on the type of the drive motor 60.

[0138] The compressor 1 may include the shaft 70. The shaft 70 may be configured to transmit power generated from the drive motor 60 to at least one of the scroll compressing portion 100 and the rotary compressing portion 200. For example, the shaft 70 may be configured to transmit power generated by the drive motor 60 to each of the scroll compressing portion 100 and the rotary compressing portion 200.

[0139] The shaft 70 may be provided to connect at least one of the scroll compressing portion 100 and the rotary compressing portion 200 to the drive motor 60. For example, the shaft 70 may be provided to connect each of the scroll compressing portion 100 and the rotary compressing portion 200 to the drive motor 60.

[0140] The shaft 70 may be provided to penetrate some of the components of the compressor 1. For example, the shaft 70 may be provided to penetrate the orbiting scroll 120, the frame 20, the muffler 240, the cylinder cover 230, the roller 250, the second base plate 220, and a balance weight 80 described later.

[0141] The shaft 70 may include a shaft body 71. The shaft body 71 may extend in the up and down direction. The shaft body 71 may be coupled to the rotor 62. The shaft body 71 may be configured to rotate together with the rotor 62.

[0142] The shaft 70 may include the first cam 72. The first cam 72 may be disposed on an upper end of the shaft body 71. The first cam 72 may have a central axis eccentric from a central axis of the shaft body 71.

[0143] The first cam 72 may be coupled to the shaft coupling portion 123 of the orbiting scroll 120. With this configuration, a rotational force of the drive motor 60 may be transmitted to the orbiting scroll 120. In addition, the first cam 72 may have a central axis eccentric from the central axis of the shaft body 71, and thus the orbiting scroll 120 may orbit with respect to the fixed scroll 110 as the shaft 70 rotates.

[0144] The shaft 70 may include the second cam 73. The second cam 73 may be disposed on a lower end of the shaft body 71. The second cam 73 may have a central axis eccentric from the central axis of the shaft body 71.

[0145] The second cam 73 may be coupled to the roller 250. With this configuration, the rotational force of the drive motor 60 may be transmitted to the roller 250. In addition, the second cam 73 may have a central axis eccentric from the central axis of the shaft body 71, and thus the roller 250 may rotate along the inner wall of the cylinder 210 as the shaft 70 rotates.

[0146] In the description, one embodiment, in which both the scroll compressing portion 100 and the rotary compressing portion 200 are driven by a single drive motor 60 and a single shaft 70 described, but the present disclosure is not limited thereto. For example, the scroll compressing portion 100 and the rotary compressing portion 200 may be driven by different drive motors or may be connected to different shafts.

[0147] The compressor 1 may include the balance weight 80. The balance weight 80 may be disposed on the upper side of the rotor 62. The balance weight 80 may be provided to adjust rotational imbalance during rotation of the rotor 62.

[0148] FIG. 8 is a cross-sectional view of the compressor according to one embodiment.

[0149] Referring to FIG. 8, the compressor 1 may include the scroll compressing portion 100 and the rotary compressing portion 200. That is, the compressor 1 may be a two-stage compressor 1 including two compressing portions 100 and 200 configured to compress the refrigerant in different ways.

[0150] The compressor 1 may perform a total of two compressions through the scroll compressing portion 100 and the rotary compressing portion 200. Therefore, the compressor 1 may easily form not only a low compression ratio but also a high compression ratio. In particular, forming a high compression ratio through the compressor 1 may be easier than forming a high compression ratio through any single-stage compressor including one of the scroll compressing portion and the rotary compressing portion. In addition, because a high compression ratio is required under conditions that require a large temperature difference from the outside, the compressor 1 may be more advantageous in an environment in which a temperature much higher than the outside temperature or a temperature much lower than the outside temperature is required.

[0151] The compressor 1 may primarily compress the refrigerant through the scroll compressing portion 100 and secondarily compress the refrigerant through the rotary compressing portion 200. In other words, the refrigerant flowing into the compressor 1 may be compressed by sequentially passing through the scroll compressing portion 100 and the rotary compressing portion 200. That is, the refrigerant flowing into the case 10 through the inlet port 14 may be compressed by passing through the rotary compressing portion 200 after passing through the scroll compressing portion 100, and the compressed refrigerant may be discharged to the outside of the case 10 through the outlet port 15.

[0152] As described above, the scroll compressing portion 100 may include the bypass device 130. Accordingly, when a large amount of liquid refrigerant flows into the compressor 1, the liquid refrigerant may be bypassed during the process in which the scroll compressing portion 100 primarily compresses the refrigerant. With this configuration, the compressor 1 may not require a separate accumulator for separating the liquid refrigerant, and the manufacturing / installation costs of the refrigeration cycle device may be reduced.

[0153] The compressor 1 may include a flow path connecting the scroll compressing portion 100 and the rotary compressing portion 200. The refrigerant discharged from the scroll compressing portion 100 may be introduced into the rotary compressing portion 200 through the flow path described above.

[0154] The compressor 1 may include the connecting pipe 300. The connecting pipe 300 may form a flow path connecting the scroll compressing portion 100 and the rotary compressing portion 200. Particularly, the connecting pipe 300 may form a flow path connecting the first receiving space S1, in which the refrigerant discharged from the scroll compressing portion 100 is received, and the second compression space C2 of the rotary compressing portion 200. In other words, the connecting pipe 300 may allow the first receiving space S1 to communicate with the second compression space C2.

[0155] The connecting pipe 300 may be coupled to the outer surface of the case 10. That is, the connecting pipe 300 may be disposed on the outside of the case 10. The outer space of the case 10 may have a relatively lower temperature than the inner space of the case 10 in which the drive motor 60, the scroll compressing portion 100, and the rotary compressing portion 200 operate. Therefore, while the refrigerant passes through the connecting pipe 300 disposed on the outside of the case 10, the refrigerant may be cooled due to the low temperature of the outer space of the case 10. With this configuration, it is possible to prevent the compressor 1 or the refrigeration cycle device from being damaged due to the high temperature of the refrigerant. In addition, a maximum pressure of the refrigerant discharged from the compressor 1 may be increased as the temperature of the refrigerant decreases. Accordingly, the performance of the compressor 1 may be increased.

[0156] The connecting pipe 300 may include a refrigerant inlet portion 310. The refrigerant inlet portion 310 may be provided to introduce the refrigerant compressed by the scroll compressing portion 100. Particularly, the refrigerant inlet portion 310 may be connected to the first receiving space S1. In other words, the refrigerant inlet portion 310 may communicate with the first receiving space S1. The refrigerant inlet portion 310 may be coupled to one side wall of the case 10 forming the first receiving space S1.

[0157] The connecting pipe 300 may include the refrigerant outlet portion 320. The refrigerant outlet portion 320 may be configured to discharge a refrigerant to the rotary compressing portion 200. Particularly, the refrigerant outlet portion 320 may be connected to the second receiving space S2. In other words, the refrigerant outlet portion 320 may communicate with the second receiving space S2. The refrigerant outlet portion 320 may be coupled to one side wall of the case 10 forming the second receiving space S2.

[0158] The refrigerant introduced into the connecting pipe 300 through the refrigerant inlet portion 310 may be discharged through the refrigerant outlet portion 320. Particularly, the refrigerant introduced into the connecting pipe 300 from the first receiving space S1 through the refrigerant inlet port 310 may be discharged into the second compression space C2 through the refrigerant outlet portion 320.

[0159] Hereinafter oil received in the case 10 and related components will be described in more detail with reference to FIG. 8

[0160] As described above, the case 10 may be provided to receive oil. That is, oil may be stored within the receiving space S. Particularly, oil may be stored within the second receiving space S2.

[0161] An oil storage space for storing oil may be formed in a lower portion of the second receiving space S2. At least a portion of the rotary compressing portion 200 may be submerged in the oil storage space.

[0162] Oil may flow into each of the scroll compressing portion 100 and the rotary compressing portion 200 through the shaft 70. Particularly, the oil in the oil storage space may be drawn into the shaft through an oil suction hole formed in the shaft 70, and then flow along an oil flow path inside the shaft 70 and may be discharged into each of the scroll compressing portion 100 and the rotary compressing portion 200 through an oil discharge hole formed in the shaft 70.

[0163] The oil introduced into the scroll compressing portion 100 may reduce friction between various members of the scroll compressing portion 100. In addition, oil introduced into the scroll compressing portion 100 may seal gaps formed between various members of the scroll compressing portion 100, thereby preventing the leakage of refrigerant introduced into the first compression space C1.

[0164] The oil introduced into the rotary compressing portion 200 may reduce friction between various members of the rotary compressing portion 200. In addition, the oil introduced into the rotary compressing portion 200 may seal gaps formed between various members of the rotary compressing portion 200, thereby preventing the leakage of refrigerant introduced into the second compression space C2.

[0165] According to the present disclosure, the compressor 1 may primarily compress the refrigerant through the scroll compressing portion 100 and secondarily compress the refrigerant through the rotary compressing portion 200. The refrigerant discharged from the rotary compressing portion 200 after passing through the two compression processes may be received in the second receiving space S2. Accordingly, the second receiving space S2 may be a space having the highest pressure within the case 10, and the first compression space C1 or the second compression space C2 may have a lower pressure than the pressure within the second receiving space S2.

[0166] Due to the above-mentioned pressure difference, it may be easier to transfer the oil received in the second receiving space S2 to the scroll compressing portion 100 forming the first compression space C1 or the rotary compressing portion 200 forming the second compression space C2. That is, because the oil is stored in the second receiving space S2 where the refrigerant, which passes through the two compression processes, is received, the process of transferring the oil to the scroll compressing portion 100 and the rotary compressing portion 200 may be facilitated.

[0167] However, a portion of the oil delivered to the scroll compressing portion 100 and the rotary compressing portion 200 may be mixed with the refrigerant. Therefore, the refrigerant discharged from the rotary compressing portion 200 may be mixed with the oil. When the oil is discharged from the compressor 1 together with the refrigerant and flows on the refrigeration cycle device, the efficiency of the refrigeration cycle device may be further reduced. Therefore, before discharging the refrigerant from the compressor 1, a process of separating the oil from the refrigerant may be required.

[0168] As described above, the refrigerant discharged from the rotary compressing portion 200 may flow toward the outlet port 15 through the drive motor 60. In the process in which the refrigerant flows through the drive motor 60, oil may be separated from the refrigerant. Particularly, the oil may be separated from the refrigerant as the oil adheres to components of the drive motor 60 or as the oil adheres to the inner surface of the case 10 due to airflow generated by the rotation of the rotor 62.

[0169] In addition, oil adhering to the components of the drive motor 60 or the inner surface of the case 10 may fall into the oil storage space due to its own weight. With this configuration, a total amount of oil inside the case 10 may be maintained.

[0170] Hereinafter the refrigerant flow path P inside the compressor 1 will be described with reference to FIG. 8.

[0171] The compressor 1 may form the refrigerant flow path P through which a refrigerant flows. The refrigerant flow path P may extend from the inlet port 14 to the outlet port 15 through the scroll compressing portion 100 and the rotary compressing portion 200. Particularly, the refrigerant flow path P may extend from the inlet port 14 and the inlet pipe 40 to the outlet port 15 and the outlet pipe 50 through the first compression space C1, the first receiving space S1, the connecting pipe 300, the second compression space C2, and the second receiving space C2.

[0172] Based on the refrigerant flow path P, the scroll compressing portion 100 may be disposed upstream of the rotary compressing portion 200. In other words, based on the refrigerant flow path P, the rotary compressing portion 200 may be disposed downstream of the scroll compressing portion 100. Based on the refrigerant flow path P, the connecting pipe 300 may be disposed between the scroll compressing portion 100 and the rotary compressing portion 200. With this configuration, the compressor 1 may primarily compress the refrigerant through the scroll compressing portion 100 and secondarily compress the refrigerant through the rotary compressing portion 200.

[0173] The refrigerant supplied into the compressor 1 may flow along the refrigerant flow path P. The refrigerant flowing along the refrigerant flow path P may be introduced into the compression space C1 of the first scroll compressing portion 100 through the inlet port 14 and the inlet pipe 40. The refrigerant introduced into the first compression space C1 may be primarily compressed and discharged into the first receiving space S1. The refrigerant discharged into the first receiving space S1 may be introduced into the second compression space C2 of the rotary compressing portion 200 through the connecting pipe 300. The refrigerant introduced into the second compression space C2 may be secondarily compressed and discharged into the second receiving space S2. The refrigerant in the second receiving space S2 may be discharged to the outside of the compressor 1 through the outlet port 15 and the outlet pipe 50.

[0174] FIG. 9 is an enlarged view of a region a shown in FIG. 8.

[0175] Referring to FIGS. 8 and 9, the frame 20 may be fixed to the case 10. In other words, the frame 20 may be coupled to the case 10.

[0176] The frame 20 may be provided to support the scroll compressing portion 100. For example, the frame 20 may support the scroll compressing portion 100 at the lower side of the orbiting scroll 120.

[0177] The frame 20 may include a protrusion 21 protruding from the outer surface of the frame 20. Particularly, the protrusion 21 may protrude from the outer surface of the frame 20 to the radial direction of the frame 20.

[0178] At least a portion of the protrusion 21 may be inserted between the main body 11 and the top cover 12. With this configuration, the frame 20 may be fixed / coupled to the case 10.

[0179] Although not shown in the drawing, the frame 20 may be welded to the inner surface of the case 10. With this configuration, the frame 20 may be more firmly fixed / coupled to the case 10.

[0180] There is no particular limitation on the fixing / coupling method of the frame 20 and the case 10. For example, the frame 20 may be fixed / coupled to the case 10 by being welded to the inner surface of the case 10 while at least a portion of the protrusion 21 is inserted between the main body 11 and the top cover 12 or only by being welded to the inner surface of the case 10. For example, a weld portion W may be formed between the case 10 and the frame 20.

[0181] The compressor 1 may include a sealing member 90. The sealing member 90 may be provided to prevent a refrigerant from leaking from the first receiving space S1 or the second receiving space S1 toward the frame 20.

[0182] The sealing member 90 may be disposed between the outer surface of the frame 20 and the inner surface of the case 10. The sealing member 90 may seal between the outer surface of the frame 20 and the inner surface of the case 10. For example, a groove 22 may be disposed on the outer surface of the frame 20, and the sealing member 90 may be inserted into the groove 22 of the frame 20. Accordingly, it is possible to prevent a refrigerant from leaking through the gap between the outer surface of the frame 20 and the inner surface of the case 10 in the first receiving space S1 or the second receiving space S2.

[0183] The sealing member 90 may extend along the outer surface of the frame 20. In other words, the sealing member 90 may be provided to surround the outer surface of the frame 20. For example, the sealing member 90 may be formed in a substantially ring shape.

[0184] The sealing member 90 may include an elastic material. For example, the sealing member 90 may include an O-ring.

[0185] In the drawing, it is illustrated that the sealing member 90 is disposed between the outer surface of the frame 20 and the inner surface of the case 10, but the position of the sealing member 90 is not limited thereto. For example, the sealing member 90 may be disposed between the outer surface of the fixed scroll 110 and the inner surface of the case 10. In this case, it is possible to prevent the refrigerant from leaking through the gap between the outer surface of the fixed scroll 110 and the inner surface of the case 10 in the first receiving space S1 or the second receiving space S2.

[0186] FIG. 10 is an enlarged view of a portion of a cross-section of a compressor according to one embodiment.

[0187] Hereinafter a compressor 1a according to one embodiment of the present disclosure will be described with reference to FIG. 10. In describing the compressor 1a, components that are substantially the same as those illustrated in FIGS. 1 to 9 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0188] The compressor 1a may include a case 10. The case 10 may include a main body 11, a top cover 12 disposed on an upper side of the main body 11, and a base 13 disposed on a lower side of the main body 11.

[0189] The compressor 1a may include a frame 20a. The frame 20a may be provided to partition an internal space of the case 10.

[0190] The frame 20a may be fixed to the case 10. In other words, the frame 20a may be coupled to the case 10.

[0191] The frame 20a may include a protrusion 21a protruding from an outer surface of the frame 20a. Particularly, the protrusion 21a may protrude from the outer surface of the frame 20a to a radial direction of the frame 20a.

[0192] At least a portion of the protrusion 21a may be inserted between the main body 11 and the top cover 12. With this configuration, the frame 20a may be fixed / coupled to the case 10a.

[0193] The protrusion 21a may be welded to the main body 11 and the top cover 12. Particularly, an outer end of the protrusion 21a, an upper end of the main body 11, and a lower end of the top cover 12 may be welded to each other. For example, a welded portion W may be formed in a space surrounded by the outer end of the protrusion 21a, the upper end of the main body 11, and the lower end of the top cover 12.

[0194] With this configuration, it is possible to prevent a refrigerant from leaking toward the frame 20a in a first receiving space S1 or a second receiving space S2. In this case, components such as the sealing member 90 or the groove 22 of the frame 20 illustrated in FIG. 9 may be omitted.

[0195] FIG. 11 is a cross-sectional view of a compressor according to one embodiment.

[0196] Hereinafter a compressor 1b according to one embodiment of the present disclosure will be described with reference to FIG. 11. In describing the compressor 1b, components that are substantially the same as those illustrated in FIGS. 1 to 9 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0197] Referring FIG. 11, the compressor 1b may include a case 10. The case 10 may form a receiving space S for receiving various components of the compressor 1b.

[0198] The compressor 1b may include a frame 20. The frame 20 may divide the receiving space S into a first receiving space S1 and a second receiving space S2. The first receiving space S1 may be provided to receive a refrigerant discharged from a scroll compressing portion 100, and the second receiving space S2 may be provided to receive a refrigerant discharged from a rotary compressing portion 200.

[0199] The compressor 1b may include a connecting pipe 300b. The connecting pipe 300b may form a flow path connecting the scroll compressing portion 100 and the rotary compressing portion 200.

[0200] The connecting pipe 300b may include a refrigerant inlet portion 310b. The refrigerant inlet portion 310b may be provided to introduce a refrigerant compressed by the scroll compressing portion 100. Particularly, the refrigerant inlet portion 310 may be connected to the first receiving space S1. In other words, the refrigerant inlet portion 310 may communicate with the first receiving space S1. The refrigerant inlet portion 310b may be coupled to one side wall of the case 10 forming the first receiving space S1.

[0201] The connecting pipe 300b may include a refrigerant outlet portion 320b. The refrigerant outlet portion 320b may be provided to discharge a refrigerant to the rotary compressing portion 200. Particularly, the refrigerant outlet portion 320b may be connected to the second receiving space S2. In other words, the refrigerant outlet portion 320b may communicate with the second receiving space S2. The refrigerant outlet portion 320b may be coupled to one side wall of the case 10 forming the second receiving space S2.

[0202] As described above, a portion of oil received in the second receiving space S2 may be delivered to the scroll compressing portion 100. Therefore, the refrigerant discharged from the scroll compressing portion 100 may be in a mixed state with oil. The oil may be introduced into the rotary compressing portion 200 through the connecting pipe 300b together with the refrigerant, or may remain inside the first receiving space S1 and be collected at a lower portion of the first receiving space S1. When an amount of oil remaining inside the first receiving space S1 increases, a total amount of oil available to the compressor 1b may decrease.

[0203] According to the present disclosure, the refrigerant inlet portion 310b may be connected to the lower portion of the first receiving space S1. That is, a position to which the refrigerant inlet portion 310b is coupled may be a lower portion of one side wall of the case 10 forming the first receiving space S1. It is appropriate that the refrigerant inlet portion 310b is connected to a lowest portion of the first receiving space S1. With this configuration, a portion of the oil collected at the lower portion of the first receiving space S1 may be introduced into the refrigerant inlet portion 310b, and an amount of oil remaining in the first receiving space S1 may be reduced. That is, a reduction in the total amount of oil available to the compressor 1b may be limited.

[0204] FIG. 12 is a cross-sectional view of a compressor according to one embodiment.

[0205] Hereinafter a compressor 1c according to one embodiment of the present disclosure will be described with reference to FIG. 12. In describing the compressor 1c, components that are substantially the same as those illustrated in FIGS. 1 to 9 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0206] Referring to FIG. 12, the compressor 1c may include a case 10. The case 10 may form a receiving space S for receiving various components of the compressor 1c.

[0207] The compressor 1c may include a plurality of frames 20 and 20c. The plurality of frames 20 may divide the receiving space S into a first receiving space S1 and a second receiving space S2. The first receiving space S1 may be provided to receive a refrigerant discharged by a scroll compressing portion 100, and the second receiving space S2 may be provided to receive a refrigerant discharged by a rotary compressing portion 200.

[0208] The plurality of frames 20 and 20c may include a first frame 20. The first frame 20 may support the scroll compressing portion 100 at a lower side of the orbiting scroll 120. For example, the first frame 20 may have substantially the same configuration as the frame 20 illustrated in FIG. 3 or FIG. 8.

[0209] The plurality of frames 20 and 20c may include a second frame 20c. The second frame 20c may support the scroll compressing portion 100 on an upper side of an orbiting scroll 120.

[0210] The compressor 1c may include a connecting pipe 300. The connecting pipe 300 may include a refrigerant inlet portion 310 and a refrigerant outlet portion 320. The refrigerant inlet port 310 may be connected to a first receiving space S1′ to introduce a refrigerant compressed by the scroll compressing portion 100. The refrigerant outlet portion 320 may be connected to a second receiving space S2′ to discharge a refrigerant to the rotary compressing portion 200.

[0211] The connecting pipe 300 may be coupled to an outer surface of the case 10. The refrigerant inlet portion 310 may be coupled to one side wall of the case 10 forming the first receiving space S1′. The refrigerant outlet portion 320 may be coupled to one side wall of the case 10 forming the second receiving space S2′.

[0212] The second frame 20c may be fixed to the case 10. In other words, the second frame 20c may be coupled to the case 10.

[0213] The second frame 20c may be provided to support the scroll compressing portion 100. For example, the second frame 20c may be provided to surround at least a portion of a fixed scroll 110. Particularly, the second frame 20c may be provided to surround at least a portion of a scroll body 111. The second frame 20c may be disposed between an outer surface of the fixed scroll 110 and an inner surface of the case 10.

[0214] The second frame 20c may be coupled to an upper portion of the fixed scroll 110. Accordingly, a vertical distance of the first receiving space S1′ may be relatively small. For example, the vertical distance of the first receiving space S1′ illustrated in FIG. 12 may be less than a vertical distance of the first receiving space S1 illustrated in FIG. 8.

[0215] As described above, a refrigerant discharged from the scroll compressing portion 100 may be in a mixed state with oil, and the oil may flow into the rotary compressing portion 200 through the connecting pipe 300 together with the refrigerant, or may remain inside the first receiving space S1′ and be collected at a lower portion of the first receiving space S1′. When an amount of oil remaining inside the first receiving space S1′ increases, a total amount of oil available to the compressor 1c may decrease.

[0216] According to the present disclosure, the refrigerant inlet portion 310 may be arranged adjacent to a lower portion of the first receiving space S1′. With this configuration, a portion of the oil collected at the lower portion of the first receiving space S1′ may be introduced into the refrigerant inlet portion 310, thereby reducing the amount of oil remaining in the first receiving space S1′. In other words, a reduction in the total amount of oil available to the compressor 1c may be limited.

[0217] FIG. 13 illustrates a refrigerant flow path of a refrigeration cycle device according to one embodiment.

[0218] Hereinafter a refrigeration cycle device according to one embodiment of the present disclosure will be described with reference to FIG. 13. In describing the refrigeration cycle device, components substantially the same as those illustrated in FIG. 1 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0219] Referring to FIG. 13, the refrigeration cycle device may include a compressor 1, a condenser 2, an expansion device 3, and an evaporator 4. The compressor 1, the condenser 2, the expansion device 3, and the evaporator 4 may form a closed cycle.

[0220] The refrigeration cycle device may include a separator 5. The separator 5 may be disposed between the condenser 2 and the expansion device 3 based on a flow path within the refrigeration cycle device. The separator 5 may be configured to separate a refrigerant, which passes through the condenser, into a gaseous refrigerant and a liquid refrigerant.

[0221] The refrigeration cycle device may include a plurality of transfer pipes for connecting the compressor 1, the condenser 2, the expansion device 3, the evaporator 4, and the separator 5 to each other. Each of the plurality of transfer pipes may be provided to transfer a refrigerant. Particularly, the plurality of transfer pipes may include a first transfer pipe P1 connecting the compressor 1 and the condenser 2, a second transfer pipe P2 connecting the condenser 2 and the expansion device 3, a third transfer pipe P3 connecting the expansion device 3 and the evaporator 4, and a fourth transfer pipe P4 connecting the evaporator 4 and the compressor 1.

[0222] The second transfer pipe P2 may include a fifth transfer pipe P5 and a sixth transfer pipe P6. The fifth transfer pipe P5 may connect the condenser 2 and the separator 5, and the sixth transfer pipe P6 may connect the separator 5 and the expansion device 3. The fifth transfer pipe P5 may transfer both gaseous and liquid refrigerants, and the sixth transfer pipe P6 may transfer only the liquid refrigerant separated in the separator 5.

[0223] The plurality of transfer pipes may include a seventh transfer pipe P7. The seventh transfer pipe P7 may connect the separator 5 and the compressor 1. The seventh transfer pipe P7 may only transfer the gaseous refrigerant separated in the separator 5.

[0224] FIG. 14 is a cross-sectional view of a compressor according to one embodiment.

[0225] Hereinafter a compressor 1d according to one embodiment of the present disclosure will be described with reference to FIG. 14. In describing the compressor 1d, components that are substantially the same as those illustrated in FIGS. 1 to 9 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0226] Referring to FIG. 14, the compressor 1d may include a case 10d. The case 10 may form a receiving space S for receiving various components of the compressor 1d.

[0227] The case 10d may include a main body 11d, a top cover 12d disposed on an upper side of the main body 11d, and a base 13d disposed on a lower side of the main body 11d.

[0228] The case 10d may include an inlet port 14. The inlet port 14 may be provided to introduce a refrigerant. Particularly, the refrigerant discharged from the evaporator 4 (refer to FIG. 13 may be provided to flow into the compressor 1d through the inlet port 14. For example, the inlet port 14 may be formed in the top cover 12d of the case 10d.

[0229] The case 10d may include an outlet port 15. The outlet port 15 may be provided to discharge a refrigerant. Particularly, the refrigerant discharged through the outlet port 15 may be provided to flow to the condenser 2 (refer to FIG. 13). For example, the outlet port 15 may be formed in the main body 11d of the case 10d.

[0230] The case 10d may include an injection inlet port 16d. The injection inlet port 16d may be provided to introduce a refrigerant. Particularly, a gaseous refrigerant discharged from the separator 5 (refer to FIG. 13) may be provided to be introduced into the compressor 1d through the injection inlet port 16d. For example, the injection inlet port 16d may be formed in the top cover 12d of the case 10d.

[0231] The compressor 1d may include an injection pipe 17d. The injection pipe 17d may be provided to penetrate the injection inlet port 16d. A seventh transfer pipe P7 for transferring a gaseous refrigerant discharged from the separator 5 (refer to FIG. 13) may be coupled to the injection inlet pipe 17d.

[0232] The compressor 1d may include a frame 20. The frame 20 may divide a receiving space S into a first receiving space S1 and a second receiving space S2. The first receiving space S1 may be provided to receive a refrigerant discharged from a scroll compressing portion 100, and the second receiving space S2 may be provided to receive a refrigerant discharged from a rotary compressing portion 200.

[0233] The injection inlet port 16d may communicate with the first receiving space S1. In addition, the injection pipe 17d may communicate with the first receiving space S1. Therefore, the gaseous refrigerant discharged from the separator 5 (refer to FIG. 13) may flow into the first receiving space S1 through the injection inlet port 16d. In other words, a portion of the refrigerant passing through the condenser 2 (refer to FIG. 13) may flow into the first receiving space S1 through the injection inlet port 16d. With this configuration, the compressed refrigerant discharged from the scroll compressing portion 100 may be mixed with the gaseous refrigerant discharged from the separator 5 (refer to FIG. 13).

[0234] The refrigerant discharged from the separator 5 (refer to FIG. 13) may have a lower temperature than that of the refrigerant discharged from the scroll compressing portion 100. Therefore, by mixing the refrigerant discharged from the scroll compressing portion 100 with the refrigerant discharged from the separator 5 (refer to FIG. 13), an average temperature of the refrigerant may be lowered, and a maximum pressure of the refrigerant discharged from the compressor 1d may be increased. In addition, an amount of refrigerant compressed per unit time in the compressor 1d may be increased. With this configuration, the performance and efficiency of the compressor 1d may be increased.

[0235] FIG. 15 is a cross-sectional view of a compressor according to one embodiment.

[0236] Hereinafter a compressor 1e according to one embodiment of the present disclosure will be described with reference to FIG. 15. In describing the compressor 1e, components that are substantially the same as those illustrated in FIGS. 1 to 9 are assigned the same reference numerals, and a detailed description thereof may be omitted.

[0237] The compressor 1e may include a case 10. The case 10 may form a receiving space S for receiving various components of the compressor 1e.

[0238] The case 10 may include a main body 11, a top cover 12 disposed on an upper side of the main body 11, and a base 13 disposed on a lower side of the main body 11.

[0239] The case 10 may include an inlet port 14. The inlet port 14 may be provided to introduce a refrigerant. Particularly, a refrigerant discharged from the evaporator 4 (refer to FIG. 13) may be provided to be introduced into the compressor 1 through the inlet port 14. For example, the inlet port 14 may be formed in the top cover 12 of the case 10.

[0240] The case 10 may include an outlet port 15. The outlet port 15 may be provided to discharge a refrigerant. Particularly, the refrigerant discharged through the outlet port 15 may be provided to flow to the condenser 2 (refer to FIG. 13). For example, the outlet port 15 may be formed in the main body 11 of the case 10.

[0241] The compressor 1e may include a frame 20. The frame 20 may divide the receiving space S into a first receiving space S1 and a second receiving space S2. The first receiving space S1 may be provided to receive the refrigerant discharged by a scroll compressing portion 100, and the second receiving space S2 may be provided to receive the refrigerant discharged by a rotary compressing portion 200.

[0242] The compressor 1e may include a connecting pipe 300e. The connecting pipe 300e may include a refrigerant inlet portion 310e and a refrigerant outlet portion 320e. The refrigerant inlet port 310e may be connected to a first receiving space S1′ to introduce the refrigerant compressed by the scroll compressing portion 100. The refrigerant outlet portion 320e may be connected to a second receiving space S2′ to discharge the refrigerant to the rotary compressing portion 200.

[0243] The connecting pipe 300e may include an injection inlet pipe 330e. The injection inlet pipe 330e may be provided to introduce a gaseous refrigerant discharged from the separator 5 (refer to FIG. 13). In other words, the injection inlet pipe 330e may be provided to introduce a portion of the refrigerant passing through the condenser 2 (refer to FIG. 13). A seventh transfer pipe P7 for transferring the refrigerant discharged from the separator 5 (refer to FIG. 13) may be coupled to the injection inlet pipe 330e.

[0244] The injection inlet pipe 330e may communicate with an inside of the connecting pipe 300e. Accordingly, the refrigerant discharged from the separator 5 (refer to FIG. 13) may flow into the connecting pipe 300e. With this configuration, the refrigerant, which is discharged from the scroll compressing portion 100 and flows into the connecting pipe 300e, may be mixed with the refrigerant discharged from the separator 5 (refer to FIG. 13).

[0245] The refrigerant discharged from the separator 5 (refer to FIG. 13) may have a lower temperature than the refrigerant discharged from the scroll compressing portion 100. Therefore, by mixing the refrigerant discharged from the scroll compressing portion 100 with the refrigerant discharged from the separator 5 (refer to FIG. 13), an average temperature of the refrigerant may be lowered, and a maximum pressure of the refrigerant discharged from the compressor 1e may be increased. In addition, an amount of refrigerant compressed per unit time in the compressor 1e may be increased. With this configuration, the performance and efficiency of the compressor 1e may be increased.

[0246] A compressor 1 according to one embodiment may include a case 10 including: an inlet port 14 and an outlet port 15; a scroll compressing portion 100 including: a fixed scroll 110 inside the case 10; and an orbiting scroll 120 configured to orbit with respect to the fixed scroll 110; and a rotary compressing portion 200 including: a cylinder 210 inside the case 10; and a roller 250 configured to rotate along an inner wall of the cylinder 210 inside the cylinder 210. The case 10, the scroll compressing portion 100, and the rotary compressing portion 200 are configured such that a refrigerant flowing into the case 10 through the inlet port 140 may pass through the scroll compressing portion 100, then pass through the rotary compressing portion 200 and be discharged to an outside of the case 10 through the outlet port 15.

[0247] The compressor 1 may further include a connecting pipe 300 including a refrigerant inlet portion 310 to receive a refrigerant compressed by the scroll compressing portion 100, and a refrigerant outlet portion 320 to discharge the refrigerant received by the refrigerant inlet portion 310 to the rotary compressing portion 200.

[0248] The connecting pipe 300 may be coupled to an outer surface of the case 10.

[0249] The compressor 1 may further include a frame 20 dividing an internal space S of the case 10 into a first receiving space S1 to receive a refrigerant discharged by the scroll compressing portion 100, and a second receiving space S2 to receive a refrigerant discharged by the rotary compressing portion 200.

[0250] The first receiving space S1 may be above the second receiving space S2.

[0251] The compressor 1 may further include a drive motor 60 configured to drive at least one of the scroll compressing portion 100 and the rotary compressing portion 200. The drive motor 60 may be in the second receiving space S2.

[0252] The outlet port 15 may be above the drive motor 60 and communicates with the second receiving space S2.

[0253] The frame 20 may support the scroll compressing portion 100. At least a portion of the frame 20 is under a lower side of the orbiting scroll 120.

[0254] The compressor 1 may further include a sealing member 90 between an outer surface of the frame 20 and an inner surface of the case 10.

[0255] The compressor 1 may further comprise an inlet pipe 40 penetrating the inlet port 14. The scroll compressing portion 100 may include a compression space C1 in which the refrigerant passing through the scroll compressing portion 100 is compressed. The inlet pipe 40 may communicate with the compression space C1.

[0256] The case 10 may further include a main body 11, and a top cover 12 on an upper side of the main body 11. The frame 20 may include a protrusion 21 protruding from the outer surface of the frame 20. At least a portion of the protrusion 21 is inserted between the main body 11 and the top cover 12.

[0257] The protrusion 21a may be welded to the main body 11 and the top cover 12.

[0258] The frame 20 supporting the scroll compressing portion 100 may be a first frame 20. The compressor 1 may further include a second frame 20c surrounding at least a portion of the fixed scroll 110 so as to support the scroll compressing portion 100.

[0259] The inlet port 14 may be a first inlet port 14 that communicates with the scroll compressing portion 100. The refrigerant discharged through the outlet port 15 may flow to a condenser 2. The compressor 1d may further include a second inlet port 16d configured to receive a gaseous refrigerant among the refrigerants that pass through the condenser 2. The second inlet port 16d may communicate with the first receiving space S1.

[0260] The refrigerant discharged through the outlet port 15 may flow to a condenser 2. The connecting pipe may further include an inlet pipe 330e provided to receive a gaseous refrigerant among refrigerants that pass through the condenser 2.

[0261] A compressor 1 according to one embodiment may include a case 10 including: an inlet port 14 and an outlet port 15; a scroll compressing portion 100 including: a fixed scroll 110 disposed inside the case 10; and an orbiting scroll 120 configured to orbit with respect to the fixed scroll 110; and a rotary compressing portion 200 including: a cylinder 210 disposed inside the case 10; and a roller 250 configured to rotate along an inner wall of the cylinder 210 inside the cylinder 210. Based on a refrigerant flow path P extending from the inlet port 14 to the outlet port 15, the scroll compressing portion 100 may be disposed upstream of the rotary compressing portion 200.

[0262] The compressor 1 may further include a connecting pipe 300 including a refrigerant inlet portion 310 provided to introduce a refrigerant compressed by the scroll compressing portion 100, and a refrigerant outlet portion 320 provided to discharge a refrigerant to the rotary compressing portion 200.

[0263] The connecting pipe 300 may be disposed between the scroll compressing portion 100 and the rotary compressing portion 200 based on the refrigerant flow path P extending from the inlet port 14 to the outlet port 15.

[0264] An internal space S of the case 10 may be divided into a first receiving space S1 provided to receive a refrigerant discharged by the scroll compressing portion 100, and a second receiving space S2 provided to receive a refrigerant discharged by the rotary compressing portion 200. The refrigerant inlet portion 310 may communicate with the first receiving space S1 and the refrigerant outlet portion 320 may communicate with the second receiving space S2.

[0265] The connecting pipe 300 may be coupled to an outer surface of the case 10.

[0266] As is apparent from the above description, a compressor may be a two-stage compressor including a scroll compressing portion and a rotary compressing portion. Therefore, forming a hi gh compression ratio through the compressor may be easier than forming a high compression ratio through any single-stage compressor including only one of the scroll compressing portion and the rotary compressing portion.

[0267] Further, a compressor may primarily compress a refrigerant through a scroll compressing portion. The scroll compressing portion may include a bypass device for separating a liquid refrigerant, thereby eliminating the need for an accumulator.

[0268] Further, a compressor may secondarily compress a refrigerant through a rotary compressing portion. In addition, a drive motor for driving at least one of a scroll compressing portion and the rotary compressing portion may be received in a space in which the rotary compressing portion is received. With this configuration, oil mixed with a refrigerant discharged from the rotary compressing portion may be separated from the refrigerant during a process of passing through the drive motor, and the separated oil may be collected in an oil storage space below the drive motor. Accordingly, the compressor may easily remove oil from the refrigerant discharged from the compressor and maintain a total amount of oil stored inside the compressor at a constant level.

[0269] Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.

[0270] While the present disclosure has been particularly described with reference to exemplary embodiments, it should be understood by those of skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure.

Claims

1. A compressor comprising:a case including:an inlet port, andan outlet port;a scroll compressing portion including:a fixed scroll inside the case, andan orbiting scroll configured to orbit with respect to the fixed scroll; anda rotary compressing portion including:a cylinder inside the case, anda roller configured to rotate along an inner wall of the cylinder inside the cylinder,wherein the case, the scroll compressing portion, and the rotary compressing portion are configured such that:a refrigerant flowing into the case through the inlet port passes through the scroll compressing portion, then passes through the rotary compressing portion, and is then discharged to an outside of the case through the outlet port.

2. The compressor of claim 1, further comprising:a connecting pipe including:a refrigerant inlet portion to receive a refrigerant compressed by the scroll compressing portion, anda refrigerant outlet portion to discharge the refrigerant received by the refrigerant inlet portion to the rotary compressing portion.

3. The compressor of claim 2, whereinthe connecting pipe is coupled to an outer surface of the case.

4. The compressor of claim 1, further comprising:a frame dividing an internal space of the case into:a first receiving space to receive a refrigerant discharged by the scroll compressing portion, anda second receiving space to receive a refrigerant discharged by the rotary compressing portion.

5. The compressor of claim 4, whereinthe first receiving space is above the second receiving space.

6. The compressor of claim 5, further comprising:a drive motor configured to drive at least one of the scroll compressing portion and the rotary compressing portion,wherein the drive motor is in the second receiving space.

7. The compressor of claim 6, whereinthe outlet port is above the drive motor, and communicates with the second receiving space.

8. The compressor of claim 4, whereinthe frame supports the scroll compressing portion, andat least a portion of the frame is under a lower side of the orbiting scroll.

9. The compressor of claim 4, further comprising:a sealing member between an outer surface of the frame and an inner surface of the case.

10. The compressor of claim 1, further comprisingan inlet pipe penetrating the inlet port,wherein the scroll compressing portion includes a compression space in which the refrigerant passing through the scroll compressing portion is compressed, andthe inlet pipe communicates with the compression space.

11. The compressor of claim 4, whereinthe case further includes:a main body, anda top cover on an upper side of the main body,the frame includes:a protrusion protruding from an outer surface of the frame, and at least a portion of the protrusion is inserted between the main body and the top cover.

12. The compressor of claim 11, whereinthe protrusion is welded to the main body and the top cover.

13. The compressor of claim 8, whereinthe frame supporting the scroll compressing portion is a first frame, andthe compressor further includes:a second frame surrounding at least a portion of the fixed scroll so as to support the scroll compressing portion.

14. The compressor of claim 4, whereinthe inlet port is a first inlet port that communicates with the scroll compressing portion,the refrigerant discharged through the outlet port flows to a condenser,the compressor further includes:a second inlet port configured to receive a gaseous refrigerant among refrigerants that pass through the condenser, andthe second inlet port communicates with the first receiving space.

15. The compressor of claim 2, whereinthe refrigerant discharged through the outlet port flows to a condenser, andthe connecting pipe further includes:an inlet pipe provided to receive a gaseous refrigerant among refrigerants that pass through the condenser.

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