Scroll compressor

Abstract

Disclosed is a scroll compressor in which a discharged refrigerant can be mixed with low-temperature oil at a low temperature to reduce the viscosity of the oil and quickly superheat the oil. The scroll compressor according to embodiments of the present invention includes a main frame, an orbiting scroll, a fixed scroll, and a discharge cover. The discharge cover has a refrigerant hole that communicates a discharge space and an oil storage space. A valve unit for opening and closing the refrigerant hole according to changes in temperature is mounted to the discharge cover.

Description

scroll compressor

[0001] The present invention relates to a scroll compressor.

[0002] The compressor used in the refrigeration cycle of a refrigerator or air conditioner compresses the refrigerant gas and transmits it to the condenser.

[0003] Rotary compressors or scroll compressors are mainly used in air conditioners, and scroll compressors are being used not only in air conditioners but also in compressors for water heaters that require a higher compression ratio than air conditioners.

[0004] A scroll compressor is classified as a sealed compressor if the drive unit (or electric unit) and the compression unit are included in one casing, and as an open compressor if they are provided independently. If the compression unit is located above the drive unit, it is classified as an upper compression type, and if located below, it is classified as a lower compression type. If the space where the drive unit is accommodated is suction pressure, it is classified as a low pressure type, and if it is discharge pressure, it is classified as a high pressure type.

[0005] In addition, the scroll compressor includes a fixed scroll having a fixed wrap and an orbiting scroll having an orbiting wrap that meshes with the fixed wrap. Scroll compressors can be classified into orbiting back-pressure types and fixed back-pressure types depending on the back pressure method. The orbiting back-pressure type is a method in which a back pressure chamber is formed on the back surface of the orbiting scroll, and the fixed back-pressure type is a method in which a back pressure chamber is formed on the back surface of the fixed scroll. Typically, in the fixed back pressure method, the fixed scroll is defined as a non-orbiting scroll and explained.

[0006] Conventional scroll compressors (especially bottom compression types) have a problem in that it takes a long time for the oil to reach superheat when starting at extremely low temperatures.

[0007] At low temperature of the compressor, the refrigerant (R290) and oil do not mix, so the oil becomes highly viscous and is not supplied to the compression section, and in this case, the refrigerant and oil do not circulate, so there is a problem that it is more difficult to secure the superheat of the oil.

[0008] The purpose of the present invention is to provide a scroll compressor in which, at a low temperature, the discharged refrigerant is mixed with oil to lower the viscosity of the oil and quickly secure the superheat of the oil, and when the temperature of the compression section rises (when the superheat of the oil is secured), the discharged refrigerant is prevented from sweeping up the oil, thereby maintaining a constant oil discharge amount.

[0009] The above-described object of the present invention is achieved by the specific contents described below.

[0010] A scroll compressor according to embodiments of the present invention includes a main frame, an orbiting scroll, a fixed scroll, and a discharge cover. The main frame is disposed below a driving motor. The orbiting scroll is disposed below the main frame and rotates. The fixed scroll is disposed below the orbiting scroll and is engaged with the orbiting scroll to form a compression chamber. The discharge cover is disposed below the fixed scroll and is formed to surround the fixed scroll, thereby forming a discharge space together with one surface of the fixed scroll. In addition, a refrigerant hole connecting the discharge space and the oil storage space is formed in the discharge cover, and a valve unit that opens and closes the refrigerant hole according to a change in temperature is mounted. Accordingly, the refrigerant in the discharge space at a low temperature is mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0011] Specifically, the discharge cover includes a fastening portion. The fastening portion protrudes from one side of the discharge cover toward the storage space by a preset length, and a through hole communicating with the refrigerant hole is formed at the center. A bimetallic tube, which is a valve unit, is fastened to the fastening portion, and the bimetallic tube opens and closes the through hole in response to temperature changes.

[0012] Specifically, the bimetallic tube includes a tube member and a filler member. The tube member is coupled to a fastening member and is formed into a rod shape having a preset length in one direction, and includes a first hole and a second hole penetrating the interior.

[0013] The above filler member is accommodated in the first hole and opens and closes the through hole of the fastening member. In addition, the filler member contracts or expands depending on changes in temperature.

[0014] Specifically, the first hole is formed from one side of one end to the other end in the longitudinal direction of the tube member. The second hole is formed on the side of the other end of the tube member and communicates with the first hole. Accordingly, the second hole is immersed in oil.

[0015] Specifically, the filler member contracts when the temperature decreases, forming a space between one end of the filler member and the through hole of the fastening member, and the space is in communication with the first hole. The refrigerant in the discharge space of the discharge cover passes through the refrigerant hole of the discharge cover, the through hole of the fastening member, and the first and second holes of the tube member, and moves to the storage space. Accordingly, the refrigerant discharged from the compression unit is mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0016] Specifically, a bimetallic valve, which is a valve unit, is attached to one side of the discharge cover. The bimetallic valve opens the refrigerant hole of the discharge cover when the temperature drops. Accordingly, the refrigerant discharged from the compression unit can be mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0017] Specifically, a temperature-sensitive valve, which is a valve unit, is attached to one side of the discharge cover. The temperature-sensitive valve opens the refrigerant hole of the discharge cover when the temperature drops. Accordingly, the refrigerant discharged from the compression unit can be mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0018] Specifically, the temperature-sensitive valve includes a valve housing, a movable member, a diaphragm member, and an operating fluid. The valve housing has an internal space and includes a cover-side hole communicating with a refrigerant hole of a discharge cover and a reservoir-side hole communicating with a reservoir space. The movable member is movable in the internal space and opens and closes the refrigerant hole of the discharge cover. The elastic member is coupled to the movable member and elastically supports the movable member. The diaphragm member supports the movable member. The operating fluid is contained inside the diaphragm member, and its volume changes when the temperature changes.

[0019] Specifically, the working fluid contracts as the temperature decreases, causing the diaphragm member to move away from the cover-side hole, and the movable member to move away from the cover-side hole, thereby opening the refrigerant hole of the discharge cover. Accordingly, the refrigerant discharged from the compression unit can be mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0020] According to other embodiments of the present invention, a scroll compressor includes a drive motor, a compression unit, a subframe, and a refrigerant discharge passage. The drive motor is coupled to the inner surface of a case and rotates a rotation shaft. The compression unit is disposed above the drive motor and includes a main frame, a rotating scroll, and a fixed scroll to compress and discharge refrigerant. The subframe is disposed in a storage space formed below the drive motor and rotatably supports a lower end of the rotation shaft. The refrigerant discharge passage is a passage through which refrigerant discharged through a discharge passage (refrigerant movement passage) provided in the main frame passes through the compression unit, the drive motor, and the subframe, and then joins with oil stored in the storage space. The refrigerant discharge passage is opened and closed according to changes in temperature. The refrigerant discharged from the compression unit can be mixed with low-temperature oil through the refrigerant discharge passage, thereby reducing the viscosity of the oil.

[0021] Specifically, the refrigerant discharge path includes an upper guide member, an anti-foaming member, and a lower guide member. The upper guide member is disposed between the main frame and the stator core of the drive motor, and includes a first refrigerant movement groove that communicates with the discharge passage of the main frame and the refrigerant passage of the stator core, respectively. The anti-foaming member is fastened to one surface of the sub-frame, and a refrigerant movement hole is formed therein. The lower guide member is disposed between the stator core and the anti-foaming member, and includes a second refrigerant movement groove that communicates with the refrigerant passage of the stator core and the refrigerant movement hole of the anti-foaming member, respectively.

[0022] Specifically, the lower guide member contracts when the temperature decreases, such that the central portion of the lower guide member is spaced apart from the inner surface of the case toward the rotational axis of the drive motor, thereby forming a refrigerant passage between the central portion of the lower guide member and the inner surface of the case. Accordingly, the refrigerant discharged from the compression unit can be mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0023] Specifically, the lower guide member expands as the temperature increases, and the central portion of the lower guide member approaches the inner surface of the case from the rotational axis of the drive motor, thereby making contact with the inner surface of the case. Accordingly, when the temperature reaches a high temperature, the refrigerant discharged from the compression unit no longer mixes with the oil.

[0024] Specifically, a scroll compressor according to another embodiment of the present invention includes an on-off valve. The on-off valve is attached to one surface of an anti-foaming member and opens and closes a refrigerant flow hole of the anti-foaming member. The on-off valve opens the refrigerant flow hole when the temperature drops. Accordingly, the refrigerant discharged from the compression unit can be mixed with low-temperature oil, thereby reducing the viscosity of the oil.

[0025] Specifically, a gap (upper space side hole) of a preset size is formed between one longitudinal end of the above-mentioned foaming prevention member and the above-mentioned lower guide member. Some of the refrigerant that has passed through the second refrigerant movement groove can move to the lower space of the oil reservoir through the refrigerant movement hole of the foaming prevention member, and other parts of the refrigerant that has passed through the second refrigerant movement groove can move to the upper space of the oil reservoir through the gap (upper space side hole) of a preset size.

[0026] A scroll compressor according to an embodiment of the present invention has a valve unit and / or a refrigerant discharge path, so that in a low temperature state, the discharged refrigerant is mixed with oil to lower the viscosity of the oil and quickly secure the superheating degree of the oil.

[0027] In addition, a scroll compressor according to an example of an embodiment of the present invention has a valve unit and / or a refrigerant discharge path, so that when the temperature of the compression section rises (when the superheating degree of the oil is secured), the discharged refrigerant is prevented from sweeping up the oil, thereby having the effect of maintaining a constant oil discharge amount.

[0028] More detailed effects of the scroll compressor of the present invention are described in the form for implementing the invention below.

[0029] FIG. 1 is a cross-sectional view of a scroll compressor according to an example of one embodiment of the present invention.

[0030] Figure 2 illustrates a bimetallic tube placed in the discharge cover of Figure 1.

[0031] Figure 3 briefly illustrates the opening and closing process of the bimetallic tube of Figure 2.

[0032] Figure 4 illustrates a bimetal valve arranged in the discharge cover of Figure 1.

[0033] Figure 5 illustrates a temperature-sensitive valve arranged in the discharge cover of Figure 1.

[0034] Figure 6 briefly illustrates the opening and closing process of the temperature-sensitive valve of Figure 5.

[0035] FIG. 7 is a cross-sectional view of a scroll compressor according to another embodiment of the present invention.

[0036] Fig. 8 illustrates an upper guide member arranged in the scroll compressor of Fig. 7.

[0037] Fig. 9 illustrates a lower guide member, a foaming prevention member, and an opening / closing valve arranged in the scroll compressor of Fig. 7.

[0038] Fig. 10 shows an example of another embodiment of the lower guide member arranged in the scroll compressor of Fig. 7.

[0039] Figure 11 is a simplified illustration of the movement of the lower guide member illustrated in Figure 10.

[0040] Hereinafter, examples of embodiments of the present invention will be described in more detail with reference to the attached drawings. For components of the present invention that are clearly understandable and easily reproducible by those skilled in the art using conventional techniques, a detailed description thereof will be omitted so as not to obscure the gist of the present invention.

[0041] The attached drawings are only provided to facilitate understanding of examples of embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings.

[0042] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0043] Additionally, terms including ordinal numbers, such as "first" and "second," used herein may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0044] Scroll compressors can be categorized as low-pressure or high-pressure, depending on the pressure of the refrigerant filling the internal space of the casing. In a low-pressure type, the internal space of the casing is filled with refrigerant at suction pressure, while in a high-pressure type, the internal space of the casing is filled with refrigerant at discharge pressure. This embodiment will be described using a high-pressure scroll compressor as a representative example.

[0045] Additionally, scroll compressors can be categorized into upper compression and lower compression types depending on the installation location of the compression unit. In the upper compression type, the compression unit is installed above the drive motor, while in the lower compression type, the compression unit is installed below the drive motor. For example, Fig. 1 illustrates a lower compression type, and Fig. 7 illustrates an upper compression type.

[0046] Below, a scroll compressor according to examples of an embodiment of the present invention is described.

[0047] Fig. 1 is a cross-sectional view of a scroll compressor (100) according to an example of one embodiment of the present invention. The scroll compressor (100) illustrated in Fig. 1 represents a bottom compression type and high-pressure type scroll compressor.

[0048] Referring to FIG. 1, the scroll compressor (100) of the present invention includes a casing (110), a compression unit (120), and a valve that opens and closes according to a change in temperature.

[0049] The casing (110) forms the exterior of the scroll compressor (100). The internal space (110a) of the casing (110) may be formed to be sealed. The casing (110) may include a cylindrical shell (111), an upper shell (112), and a lower shell (113).

[0050] The cylindrical shell (111) may be formed in a cylindrical shape with both ends opened. The upper shell (112) and the lower shell (133) may be respectively joined to both ends of the cylindrical shell (111) so as to cover the opened upper and lower ends of the cylindrical shell (111), respectively.

[0051] The internal space (110a) of the casing (110) can be divided into a lower space (S1) and an upper space (S2) based on the driving motor (101) described later. A storage space (S3) can be formed by being separated from the lower side of the lower space (S1) based on the compression unit (120). The lower space (S1) can form a discharge space, and the upper space (S2) can form an oil separation space.

[0052] The refrigerant suction pipe (114) can be formed in an L-shape, and one end can penetrate the cylindrical shell (111) and be connected to the suction port (107) of the compression section (120).

[0053] A driving motor (101) may be installed on the upper part of the casing (110), and a main frame (121), a rotating scroll (122), a fixed scroll (123), and a discharge cover (124) may be sequentially installed on the lower part of the driving motor (101). In general, the driving motor (101) constitutes the electric part of the scroll compressor (100), and the main frame (121), the rotating scroll (122), the fixed scroll (123), and the discharge cover (124) may constitute the compression part (120).

[0054] The above-described electric part may be coupled to the upper end of the rotation shaft (102) described below, and the compression part (120) may be coupled to the lower end of the rotation shaft (102). Accordingly, the scroll compressor (100) may have a lower compression type structure in which the compression of the refrigerant (R) occurs at the lower end of the scroll compressor (100). In addition, the compression part (120) may be connected to the electric part by the rotation shaft (102) and may be operated by the rotational force of the electric part.

[0055] The drive motor (101) may include a stator (101a) and a rotor (101b).

[0056] The stator (101a) is inserted and fixed into the inner surface of the cylindrical shell (111). The rotor (101b) is rotatably arranged on the inner side of the stator (101a).

[0057] The stator (101a) includes a stator core (101a1) and a stator coil (101a2).

[0058] The stator core (101a1) is formed in a cylindrical shape and can be fixed to the inner surface of the cylindrical shell (111) by hot pressing. On the outer surface of the stator core (101a1), a plurality of recessed surfaces (101a1') formed in a D-cut shape along the longitudinal direction can be formed at predetermined intervals along the circumferential direction.

[0059] A first oil recovery path (not shown) through which oil passes may be provided between the recess surface (101a1') and the inner surface of the cylindrical shell (111). Accordingly, oil separated from the refrigerant (R) in the upper space (S2) may move to the lower space (S1) through the first oil recovery path and then move to the oil storage space (S3) through the second oil recovery path (not shown) to be recovered.

[0060] The stator coil (101a2) is wound around the stator core (101a1) and is electrically connected to an external power source through a terminal (not shown) that is connected through the casing (110). An insulator (101a3), which is an insulating material, may be inserted between the stator core (101a1) and the stator coil (101a2).

[0061] The insulator (101a3) is extended lengthwise on both sides to accommodate the stator coil (101a2) in the radial direction, and the insulator (101a3) extending downward can form an oil separator (not shown) to prevent the refrigerant (R) discharged to the lower space (S1) from being mixed with the oil recovered from the upper space (S2).

[0062] The rotor (101b) includes a rotor core (101b1) and a permanent magnet (101b2).

[0063] The rotor core (101b1) may be formed in a cylindrical shape. The rotor core (101b) may be rotatably inserted into the interior of the stator core (101a1) at a predetermined gap interval. The permanent magnets (101b2) may be embedded in the interior of the rotor core (101b1) at a predetermined gap interval along the circumference.

[0064] In addition, a rotation shaft (102) is coupled to the center of the rotor (101b). The upper end of the rotation shaft (102) is press-fitted and coupled to the rotor (101b). In addition, the lower end of the rotation shaft (102) is rotatably inserted into the main frame (121) and supported in the radial direction. An Oldham ring (105) can be rotatably inserted between the main frame (121) and a rotating scroll (122) described later.

[0065] The rotary shaft (102) transmits the rotational force of the driving motor (101) to the rotary scroll (122) of the compression unit (120). Then, the rotary scroll (122) eccentrically coupled to the rotary shaft (102) rotates relative to the fixed scroll (123).

[0066] Meanwhile, the rotary shaft (102) includes a shaft portion (102a), a first bearing portion (102b), a second bearing portion (102c), and an eccentric portion (102d). An oil supply passage (103) for supplying oil to the bearing components of the scroll compressor (100) and the eccentric portion (102d) is formed inside the rotary shaft (102).

[0067] In addition, an oil feeder (104) for pumping oil filled in the oil storage space (S3) may be provided at the bottom of the rotating shaft (102). The oil feeder (104) may be composed of an oil suction pipe (104a) that is connected to the oil supply passage (103) of the rotating shaft (102) and a blocking member (104b) that receives the oil suction pipe (104a) and blocks the intrusion of foreign substances. The oil suction pipe (104a) may be formed to extend downward so as to penetrate the discharge cover (124) and be immersed in the oil received in the oil storage space (S3).

[0068] The shaft portion (102a) forms the upper portion of the rotation shaft (102). The shaft portion (102a) is formed in a circular rod shape. A rotor (101b) can be press-fitted and joined to the upper portion of the shaft portion (102a).

[0069] The first bearing portion (102b) is arranged at the lower portion of the shaft portion (102a) and supports the shaft portion (102a) in the radial direction of the shaft portion (102a).

[0070] The second bearing portion (102c) is positioned at the lower end of the shaft portion (102a). The second bearing portion (102c) supports the shaft portion (102a) which rotates in the radial direction of the shaft portion (102a) together with the first bearing portion (102b). The second bearing portion (102c) may be configured to have the same rotational axis as the first bearing portion (102b).

[0071] The eccentric portion (102d) is formed between the lower end of the first bearing portion (102b) and the upper end of the second bearing portion (102c). The eccentric portion (102d) may be formed such that its center of rotation is radially eccentric with respect to the first bearing portion (102b) or the second bearing portion (102c). Accordingly, the orbiting scroll (122) may be configured to orbit with respect to the fixed scroll (123) when the rotation shaft (102) rotates.

[0072] The compression unit (120) may include a main frame (121), a rotating scroll (122), a fixed scroll (123), and a discharge cover (124).

[0073] The main frame (121) is arranged on the lower side of the driving motor (101) and is formed to accommodate a rotating scroll (122) described later.

[0074] The rotary scroll (122) includes a rotary plate portion (122a), a rotary wrap (122b), and a rotary shaft coupling portion (122c).

[0075] The pivot plate (122a) can be formed to have a circular shape.

[0076] The turning wrap (122b) can be formed to extend from the bottom surface of the turning plate (122a) toward the fixed scroll (123). The turning wrap (122b) is interlocked with the fixed wrap (123c) to form a compression chamber (V).

[0077] The turning wrap (122b) can be formed in an involute shape together with the fixed wrap (123c) described later.

[0078] The inner end of the turning wrap (122b) is formed in the central portion of the turning plate portion (122a), and a rotation shaft coupling portion (122c) can be formed axially through the central portion of the turning plate portion (122a).

[0079] An eccentric portion (102d) of the rotary shaft (102) is rotatably inserted and connected to the rotary shaft coupling portion (122c). Accordingly, the outer circumference of the rotary shaft coupling portion (122c) is connected to the rotating wrap (122b) and serves to form a compression chamber (V) together with the fixed wrap (123c) described later during the compression process of the refrigerant (R).

[0080] The fixed scroll (123) may include a fixed plate portion (123a), a fixed side wall portion (123b), and a fixed wrap (123c).

[0081] The fixed plate portion (123a) may be formed to have a circular shape. The fixed plate portion (123a) may be provided with a discharge port (130) that forms a path through which the refrigerant (R) is discharged from the compression chamber (V) to the outside of the compression chamber (V). The refrigerant (R) compressed in the compression chamber (V) may be discharged to the discharge space (S4) of the discharge cover (124) to be described later through the discharge port (130). A plurality of discharge ports (130) may be provided.

[0082] The fixed side wall portion (123b) can be formed in a ring shape by extending axially from the upper edge of the fixed plate portion (123a).

[0083] The fixed wrap (123c) can be formed to extend axially from the upper surface of the fixed plate portion (123a) toward the rotating scroll (122). The fixed wrap (123c) is interlocked with the rotating wrap (122b) to form a compression chamber (V).

[0084] When power is applied to the drive motor (101), rotational force is generated in the rotor (101b) and the rotation shaft (102), causing them to rotate, and the rotary scroll (122) eccentrically coupled to the rotation shaft (102) rotates relative to the fixed scroll (123) by the Oldham ring (105), thereby compressing the refrigerant (R) in the compression chamber (V).

[0085] The discharge cover (124) is placed on the lower part (bottom) of the fixed scroll (123) and is formed to surround the fixed scroll (123), thereby forming a discharge space (S4) together with one side of the fixed scroll (123).

[0086] The valve member (140) is configured to open and close the discharge port (130) of the refrigerant (R) provided in the compression unit (120). Specifically, the refrigerant (R) introduced into the compression chamber (V) through the suction port (107) of the compression unit (120) is compressed by the operation of the driving motor (101) while the rotating scroll (122) continues to rotate relative to the fixed scroll (123), thereby changing from a low-pressure state to a high-pressure state, and is discharged into the internal space (110a) of the casing (110) through the discharge port (130). For example, the refrigerant (R) compressed in the compression chamber (V) can be discharged into the discharge space (S4).

[0087] The reason for providing a valve structure for opening and closing the discharge port (130) in a scroll-type compressor is to prevent the high-pressure refrigerant (R) discharged from the compression chamber (V) through the discharge port (130) from flowing back into the compression chamber (V) where it has changed to a relatively low-pressure state.

[0088] Meanwhile, in Fig. 1, drawing reference numeral 115 is a refrigerant discharge pipe.

[0089] The scroll compressor according to the first embodiment, the second embodiment, and the third embodiment of the present invention described below includes a valve that opens and closes according to a change in temperature. The valve is applied to the scroll compressor (100) illustrated in FIG. 1.

[0090] <Example of the first implementation state>

[0091] Fig. 2 illustrates a bimetallic tube (170) placed in the discharge cover (124) of Fig. 1, and Fig. 3 briefly illustrates the opening and closing process of the bimetallic tube (170) of Fig. 2.

[0092] Referring to FIGS. 1 to 3, a scroll compressor (100) according to an example of the first embodiment of the present invention includes a bimetal tube (170).

[0093] The bimetal tube (170) is a valve unit that opens and closes the refrigerant hole (124h) formed in the discharge cover (124) according to changes in temperature.

[0094] A bimetallic tube (170) is placed in the discharge cover (124).

[0095] [Discharge cover (124)]

[0096] A refrigerant hole (124h) is formed in the discharge cover (124).

[0097] The refrigerant hole (124h) is a hole that penetrates the discharge cover (124).

[0098] One side of the refrigerant hole (124h) communicates with the internal space (discharge space (S4)) of the discharge cover (124), and the other side of the refrigerant hole (124h) communicates with the storage space (S3).

[0099] The refrigerant hole (124h) is a passage through which the refrigerant (R) moves.

[0100] The discharge cover (124) includes a fastening portion (1241).

[0101] The fastening portion (1241) surrounds the refrigerant hole (124h).

[0102] The fastening portion (1241) is formed on one side of the discharge cover (124). One side of the discharge cover (124) is a side facing the storage space (S3).

[0103] The fastening portion (1241) protrudes from one side of the discharge cover (124) toward the storage space (S3) by a preset length.

[0104] A through hole (1241h) is formed at the center of the fastening portion (1241). The through hole (1241h) of the fastening portion (1241) communicates with the refrigerant hole (124h). That is, the fastening portion (1241) surrounds the refrigerant hole (124h) so that the through hole (1241h) communicates with the refrigerant hole (124h) and protrudes toward the storage space (S3).

[0105] A bimetallic tube (170) is connected to the fastening portion (1241).

[0106] The bimetallic tube (170) includes a tube member (171) and a filler member (172).

[0107] [Tube Absence (171)]

[0108] The tube member (171) is formed in a rod shape with a preset length in one direction and includes holes (1711, 1712) penetrating the inside.

[0109] The tube member (171) includes one end and the other end, which are two ends in one direction.

[0110] The tube member (171) includes an outer surface formed between one end and the other end, one surface (e.g., an upper surface) of the one end and one surface (e.g., a lower surface) of the other end. The one surface of the one end and the one surface of the other end face opposite sides.

[0111] Additionally, the tube member (171) includes a first hole (1711) and a second hole (1712).

[0112] The first hole (1711) is a hole formed from one side of one end to the other end in the longitudinal direction of the tube member (171).

[0113] By the first hole (1711), an inner surface (or inner circumference) is formed in the tube member (171). That is, the inner surface (or inner circumference) of the tube member (171) is an inner surface surrounding the first hole (1711).

[0114] The second hole (1712) communicates with the first hole (1711) and may be formed on a side (specifically, a side of the other end) and / or one surface of the other end.

[0115] For example, the second hole (1712) can be formed by penetrating the side surface (outer surface and inner surface) of the other end.

[0116] Alternatively, for example, the second hole (1712) may be formed on a portion of one side of the other end (on the edge side of the one side).

[0117] Alternatively, for example, the second hole (1712) may be formed on a side surface of the other end and a portion (edge ​​side) of one surface of the other end. This second hole (1712) is shown as being formed as a single hole that is connected to each other.

[0118] Although not shown, in an embodiment of the present invention, the tube member (171) may have one or more curved portions.

[0119] The tube member (171) is connected to the fastening member (1241). Specifically, one end of the tube member (171) is connected to the fastening member (1241).

[0120] For example, a screw thread is formed on the outer surface of the fastening portion (1241) (male screw), and a screw groove is formed on the inner surface of one end of the tube member (171) (female screw), so that the tube member (171) can be screw-connected to the fastening portion (1241).

[0121] Alternatively, for example, the tube member (171) may be press-fitted into the fastening member (1241).

[0122] When the tube member (171) is pressed into the fastening portion (1241), the inner surface of one end of the tube member (171) and the outer surface of the fastening portion (1241) are in close contact, so that the tube member (171) can be maintained in a state of being coupled to the fastening portion (1241).

[0123] Meanwhile, when one end of the tube member (171) is connected to the fastening portion (1241), the other end of the tube member (171) is immersed in the oil contained in the oil storage space (S3). At this time, the second hole (1712) of the tube member (171) is also immersed in the oil contained in the oil storage space (S3).

[0124] The tube member (171) includes a filler fixing member (1713).

[0125] The filler fixing member (1713) fixes the filler member (172).

[0126] The filler fixing member (1713) is formed on one surface of the other end of the tube member (171).

[0127] The filler fixing member (1713) may be a groove or a hole.

[0128] For example, the filler fixing portion (1713) may be formed in a groove shape on the inner surface of one side of the other end (see Fig. 3). One end of the filler member (172) is placed and fixed to this filler fixing portion (1713).

[0129] Alternatively, for example, the filler fixing member (1713) may be formed as a hole penetrating one surface of the other end. This hole communicates with the first hole (1711). One end of the filler member (172) may be press-fitted into this hole and fixed therein. The diameter of this hole may be small enough so that the filler member (172) can be fixed in this hole even when the filler member (172) shrinks.

[0130] A portion of the refrigerant (R) discharged to the discharge space (S4) can move to the storage space (S3) through the refrigerant hole (124h) of the discharge cover (124), the through hole (1241h) of the fastening portion (1241), and the first hole (1711) and second hole (1712) of the tube member (171).

[0131] [Filler Absence (172)]

[0132] The filler member (172) is formed into a rod shape with a preset length in one direction.

[0133] The filler member (172) is formed of a material having a larger thermal expansion coefficient than the tube member (171).

[0134] When the temperature of the filler member (172) increases (high temperature state, normal state), the filler member (172) expands, and when the temperature of the filler member (172) decreases (low temperature state), the filler member (172) contracts.

[0135] The filler member (172) is placed in a hole (first hole (1711)) formed in the tube member (171).

[0136] The cross-sectional diameter of the filler member (172) is formed to be smaller than the diameter (inner diameter) of the first hole (1711) of the tube member (171), so that the filler member (172) is accommodated in the first hole (1711). The cross-sectional diameter represents the diameter of the cut surface when the filler member (172) is cut in a direction orthogonal to the longitudinal direction of the filler member (172).

[0137] The filler member (172) includes one end and the other end, which are opposite ends in one direction (lengthwise).

[0138] The cross-sectional diameter of one end of the filler member (172) is formed to be larger than the cross-sectional diameter of the other end.

[0139] Additionally, the cross-sectional diameter of one end of the filler member (172) is formed to be larger than the diameter (inner diameter) of the through hole (1241h) of the fastening member (1241).

[0140] When the temperature rises and the filler member (172) expands, one end of the filler member (172) comes into close contact with the end of the fastening portion (1241), thereby blocking the through hole (1241h) of the fastening portion (1241). That is, the portion where one end of the filler member (172) and the fastening portion (1241) come into contact with each other is sealed, and the through hole (1241h) of the fastening portion (1241) is blocked. Accordingly, the refrigerant (R) cannot move to the first hole (1711) of the tube member (171).

[0141] In addition, when the temperature decreases and the filler member (172) shrinks, the volume of the filler member (172) is reduced overall, so that one end of the filler member (172) is spaced apart from the end of the fastening portion (1241). Accordingly, a space is formed between one end of the filler member (172) and the through hole (1241h) of the fastening portion (1241). This space becomes a passage for the refrigerant (R). That is, the refrigerant (R) can move into this space and move to the first hole (1711) and the second hole (1712) of the tube member (171).

[0142] However, even if the filler member (172) shrinks, the cross-sectional diameter of one end of the filler member (172) is formed to be larger than the diameter of the through hole (1241h) of the fastening portion (1241). Accordingly, even if the filler member (172) shrinks, one end of the filler member (172) is not drawn into the through hole (1241h) of the fastening portion (1241).

[0143] In summary, when the temperature of the compressor is low or the temperature of the oil contained in the oil storage space (S3) is low, the filler member (172) contracts, and a passage for the refrigerant (R) is formed between the first hole (1711) of the tube member (171) and the filler member (172).

[0144] Accordingly, the refrigerant (R) passes through the refrigerant hole (124h) of the discharge cover (124), the through hole (1241h) of the fastening portion (1241), the first hole (1711) and the second hole (1712) of the tube member (171), moves to the oil storage space (S3), and mixes with the oil contained in the oil storage space (S3). Due to the mixing of the refrigerant (R) and the oil, the viscosity of the oil is lowered, and the superheating degree of the oil is quickly secured.

[0145] When the temperature of the compression member (120) rises or the superheating of the oil is secured, one end of the filler member (172) is pressed against the end of the fastening member (1241), thereby blocking the through hole (1241h) of the fastening member (1241).

[0146] Accordingly, the refrigerant (R) in the oil storage space (S3) is prevented from moving toward the discharge cover (124) (or lower space (S1)), so that the amount of oil contained in the oil storage space (S3) is maintained constant.

[0147] <Example of the second implementation state>

[0148] Figure 4 illustrates a bimetal valve (180) placed on the discharge cover (124) of Figure 1.

[0149] Referring to FIGS. 1 and 4, a scroll compressor (100) according to an example of a second embodiment of the present invention includes a bimetal valve (180).

[0150] In the discharge cover (124), a refrigerant hole (124h) is formed in the scroll compressor according to the example of the first embodiment of the present invention described above. The description of the refrigerant hole (124h) is replaced with the above-described content.

[0151] [Bimetal valve (180)]

[0152] The bimetal valve (180) is a valve unit that opens and closes the refrigerant hole (124h) of the discharge cover (124) according to changes in temperature.

[0153] A bimetallic valve (180) is formed by overlapping a first metal plate (181) and a second metal plate (182) having different thermal expansion coefficients.

[0154] The first metal plate (181) and the second metal plate (182) are thin, narrow, and long in one direction.

[0155] The first metal plate (181) and the second metal plate (182) can be joined into one object by welding, or can be joined by brazing or mechanical riveting.

[0156] The bimetal valve (180) of the present invention bends when the temperature decreases.

[0157] When the temperature of the bimetal valve (180) decreases (low temperature state), the first metal plate (181) contracts, and the first metal plate (181) and the second metal plate (182) bend toward the first metal plate (181).

[0158] And, when the temperature of the bimetal valve (180) increases (high temperature state, normal state), the first metal plate (181) expands, and the first metal plate (181) and the second metal plate (182) bend toward the second metal plate (182).

[0159] The bimetal valve (180) is positioned to cover the refrigerant hole (124h) of the discharge cover (124).

[0160] The bimetal valve (180) is fastened to one side of the discharge cover (124) facing the storage space (S3).

[0161] For example, one side of the bimetal valve (180) and one side of the discharge cover (124) may be fastened by a fastening member such as a bolt, a nut, or a screw. In the example of this embodiment, a fastening hole (180h) in which a fastening member is placed is formed on one side of the bimetal valve (180). In addition, a fastening hole in which a fastening member is placed may also be formed on one side of the discharge cover (124).

[0162] Alternatively, for example, one side of the bimetal valve (180) and one side of the discharge cover (124) may be joined by welding or soldering.

[0163] The first metal plate (181) of the bimetal valve (180) is positioned toward the storage space (S3), and the second metal plate (182) is positioned toward the refrigerant hole (124h) of the discharge cover (124).

[0164] In a low temperature state, the bimetal valve (180) opens the refrigerant hole (124h) of the discharge cover (124).

[0165] That is, in a low temperature state, the first metal plate (181) of the bimetal valve (180) contracts, so the first metal plate (181) and the second metal plate (182) bend toward the first metal plate (181). Accordingly, the refrigerant hole (124h) of the discharge cover (124) opens.

[0166] The refrigerant (R) in the internal space (discharge space (S4)) of the discharge cover (124) moves to the oil storage space (S3) through the open refrigerant hole (124h) and mixes with the oil contained in the oil storage space (S3). Due to the mixing of the refrigerant (R) and the oil, the viscosity of the oil is reduced and the superheating degree of the oil is quickly secured.

[0167] At high temperature, the bimetal valve (180) closes (covers) the refrigerant hole (124h) of the discharge cover (124).

[0168] That is, when the temperature rises from a low temperature state to a high temperature state (normal state) due to the operation of the compressor, the first metal plate (181) expands, and the first metal plate (181) and the second metal plate (182) bend toward the second metal plate (182). Accordingly, the refrigerant hole (124h) of the discharge cover (124) is closed.

[0169] The refrigerant (R) in the discharge space (S4) of the discharge cover (124) cannot move to the oil storage space (S3) through the refrigerant hole (124h). In addition, the refrigerant in the oil storage space (S3) cannot move toward the discharge cover (124) (or lower space (S1)) through the refrigerant hole (124h), so that the amount of oil contained in the oil storage space (S3) is maintained constant.

[0170] <Example of the third implementation state>

[0171] Fig. 5 illustrates a temperature-sensitive valve (190) placed on the discharge cover (124) of Fig. 1, and Fig. 6 briefly illustrates the opening and closing process of the temperature-sensitive valve (190) of Fig. 5.

[0172] Referring to FIGS. 1, 5 and 6, a scroll compressor (100) according to an example of a third embodiment of the present invention includes a temperature sensitive valve (190).

[0173] In the discharge cover (124), a refrigerant hole (124h) is formed in the scroll compressor according to the example of the first embodiment of the present invention described above. The description of the refrigerant hole (124h) is replaced with the above-described content.

[0174] [Temperature-sensitive valve (190)]

[0175] The temperature sensitive valve (190) is a valve unit that opens and closes the refrigerant hole (124h) of the discharge cover (124) according to changes in temperature.

[0176] A temperature-sensitive valve (190) includes a valve housing (191), a moving member (192), an elastic member (193), a diaphragm member (194), and an operating fluid (195).

[0177] The valve housing (191) forms the exterior of the temperature-sensitive valve (190).

[0178] The valve housing (191) can be formed in various shapes having a space inside.

[0179] The internal space (191S) of the valve housing (191) accommodates an elastic member (193), a movable member (192), a diaphragm member (194), and an operating fluid (195).

[0180] A cover side hole (1911) and a storage space side hole (1912) are formed in the valve housing (191).

[0181] The cover side hole (1911) is formed on one side of the valve housing (191) and communicates with the refrigerant hole (124h) of the discharge cover (124).

[0182] The valve housing (191) is coupled to one side of the discharge cover (124), and is coupled at a position where the cover-side hole (1911) of one side of the discharge cover (124) communicates with the refrigerant hole (124h) of the discharge cover (124).

[0183] The way in which the valve housing (191) is joined to one side of the discharge cover (124) can be achieved by various methods such as welding or soldering.

[0184] The oil storage space side hole (1912) is formed on the other side of the valve housing (191) and communicates with the oil storage space (S3). The refrigerant (R) in the internal space (discharge space (S4)) of the discharge cover (124) can move to the internal space (191S) of the valve housing (191) through the cover side hole (1911), and the refrigerant (R) introduced into the internal space (191S) of the valve housing (191) can move to the oil storage space (S3) through the oil storage space side hole (1912).

[0185] One or more low-pressure space side holes (1912) may be formed in the valve housing (191).

[0186] The movable member (192) can move in the internal space (191S) of the valve housing (191).

[0187] The moving member (192) includes a pillar portion (1921) and a head portion (1922).

[0188] The column (1921) is formed in the shape of a bar with a preset length in one direction.

[0189] The column part (1921) includes one end and the other end, which are both ends in the longitudinal direction of the column part (1921).

[0190] One end of the pillar portion (1921) faces the refrigerant hole (124h) of the discharge cover (124) or the cover-side hole (1911) of the valve housing (191).

[0191] The cross-sectional diameter of the column portion (1921) or the cross-sectional diameter of one end of the column portion (1921) is formed to be equal to or larger than the inner diameter of the refrigerant hole (124h) of the discharge cover (124). The cross-sectional diameter refers to the diameter of the cross-section when the column portion (1921) is cut in a direction perpendicular to the longitudinal direction of the column portion (1921).

[0192] As the movable member (192) moves, the column part (1921) or one end of the column part (1921) blocks the refrigerant hole (124h) of the discharge cover (124). The refrigerant (R) in the discharge space (S4) of the discharge cover (124) is blocked by the column part (1921) and cannot move to the internal space (191S) of the valve housing (191).

[0193] The head portion (1922) is connected to the pillar portion (1921). Specifically, the head portion (1922) is formed at the other end of the pillar portion (1921).

[0194] The cross-sectional diameter of the head (1922) is formed to be larger than the cross-sectional diameter of the column (1921).

[0195] The cross-sectional diameter of the head (1922) is formed to be larger than the inner diameter of the refrigerant hole (124h) of the discharge cover (124). Accordingly, the head (1922) is not drawn into the refrigerant hole (124h) of the discharge cover (124).

[0196] The head (1922) is supported by an elastic member (193) and a diaphragm member (194) described later.

[0197] The elastic member (193) has a preset elastic coefficient.

[0198] The elastic member (193) may be, for example, a coil spring.

[0199] The elastic member (193) has a preset length in one direction.

[0200] The elastic member (193) includes one end and the other end which are longitudinal ends, and a central hole penetrating the center in the longitudinal direction.

[0201] The elastic member (193) is coupled to the movable member (192) and elastically supports the movable member (192).

[0202] The inner diameter of the center hole of the elastic member (193) is formed to be smaller than the cross-sectional diameter of the head portion (1922) of the movable member (192) and larger than the cross-sectional diameter of the column portion (1921) of the movable member (192).

[0203] Accordingly, the column part (1921) of the movable member (192) is inserted and placed in the center hole of the elastic member (193), one end of the elastic member (193) is placed on the side of one end of the column part (1921), and the other end of the elastic member (193) is placed on the side of the head part (1922).

[0204] One end of the elastic member (193) is coupled to the inner surface of the valve housing (191).

[0205] And, the other end of the elastic member (193) is combined or in contact with one side of the head (1922) of the movable member (192) to support the head (1922). That is, the elastic member (193) supports the movable member (192).

[0206] When the elastic member (193) is elastically deformed by an external force and contracts in the longitudinal direction, the movable member (192) moves in the longitudinal direction of the elastic member (193) (or the column part (1921)), so that the column part (1921) of the movable member (192) or one end of the column part (1921) blocks the refrigerant hole (124h) of the discharge cover (124).

[0207] And, when the elastic member (193) is restored to its original length by the restoring force, the movable member (192) returns to the position before the elastic member (193) was expanded. Accordingly, the column part (1921) of the movable member (192) or one end of the column part (1921) is spaced apart from the refrigerant hole (124h) of the discharge cover (124), so that a space in which the refrigerant (R) can move is formed between the column part (1921) of the movable member (192) or one end of the column part (1921) and the refrigerant hole (124h) of the discharge cover (124).

[0208] The refrigerant in the discharge space (S4) of the discharge cover (124) can move to the internal space (191S) of the valve housing (191) through the refrigerant hole (124h) of the discharge cover (124) and the cover-side hole (1911) of the valve housing (191), and the refrigerant (R) introduced into the internal space (191S) of the valve housing (191) can move to the storage space (S3) through the storage-space-side hole (1912).

[0209] The diaphragm member (194) has an elastic coefficient and is formed as a thin film.

[0210] The diaphragm member (194) is formed of natural rubber, synthetic rubber, or a metal plate, and has elasticity and flexibility.

[0211] The diaphragm member (194) supports the movable member (192) (specifically, the head (1922)). The diaphragm member (194) is in contact with at least the head (1922) of the movable member (192).

[0212] The diaphragm member (194) is placed in the internal space (191S) of the valve housing (191), on the side opposite to the cover-side hole (1911) of the valve housing (191).

[0213] According to an example of an embodiment of the present invention, a working fluid (195) is contained inside the diaphragm member (194), that is, inside the diaphragm member (194) surrounded by the diaphragm member (194) and the inner surface of the valve housing (191). In this case, the portion where the diaphragm member (194) and the inner surface of the valve housing (191) come into contact is sealedly joined.

[0214] Alternatively, according to another embodiment of the present invention, the diaphragm member (194) may be formed to have a sealed receiving space, like a balloon, from the outside. A working fluid (195) may be received in the receiving space.

[0215] The working fluid (195) is formed of a material that expands and contracts according to temperature changes.

[0216] Specifically, the working fluid (195) expands when the temperature rises from low temperature to high temperature, and contracts when the temperature falls from high temperature to low temperature.

[0217] When the working fluid (195) expands, the diaphragm member (194) expands, and when the working fluid (195) contracts, the diaphragm member (194) contracts.

[0218] Since the working fluid (195) is contracted in a low-temperature state, the diaphragm member (194) is in a contracted state. In this state, the diaphragm member (194) does not pressurize the movable member (192). The movable member (192) (specifically, the column portion (1921)) is spaced apart from the cover-side hole (1911) and the refrigerant hole (124h) of the discharge cover (124), and a space in which the refrigerant (R) can move is formed between the column portion (1921) of the movable member (192), the cover-side hole (1911), and the refrigerant hole (124h) of the discharge cover (124). The refrigerant (R) can move into the space.

[0219] As the temperature of the internal space (191S) of the valve housing (191) rises due to the operation of the compressor, the temperature of the working fluid (195) rises, causing the working fluid (195) to expand.

[0220] When the working fluid (195) expands, the diaphragm member (194) expands, and the diaphragm member (194) pressurizes the movable member (192) (specifically, the head portion (1922)). Accordingly, the movable member (192) moves toward the cover-side hole (1911) and the refrigerant hole (124h) of the discharge cover (124), thereby blocking the refrigerant hole (124h) of the discharge cover (124). At this time, the elastic member (193) is elastically deformed and its length is contracted.

[0221] When the compressor stops operating and the temperature of the internal space (191S) of the valve housing (191) drops, the temperature of the working fluid (195) drops, causing the working fluid (195) to contract.

[0222] When the working fluid (195) contracts, the diaphragm member (194) shrinks, so that the diaphragm member (194) does not pressurize the movable member (192). Accordingly, the movable member (192) returns to its original position (the position before the elastic member (193) expands) by the restoring force of the elastic member (193), so that the movable member (192) (specifically, the columnar portion (1921)) is spaced apart from the cover-side hole (1911) and the refrigerant hole (124h) of the discharge cover (124). A space in which the refrigerant (R) can move is formed between the columnar portion (1921) of the movable member (192), the cover-side hole (1911), and the refrigerant hole (124h) of the discharge cover (124), so that the refrigerant (R) can move through the space.

[0223] Fig. 7 is a cross-sectional view of a scroll compressor (200) according to another embodiment of the present invention. The scroll compressor (200) illustrated in Fig. 7 represents a top compression type and high-pressure type scroll compressor.

[0224] Referring to FIG. 7, the scroll compressor (200) of the present invention has a drive motor (220) installed in the lower half of a casing (210), and a main frame (230) installed on the upper side of the drive motor (220). A compression unit is installed on the upper side of the main frame (230). The compression unit includes a fixed scroll (240) and a rotating scroll (250), but in some cases, the main frame (230) may also be described as being included in the compression unit.

[0225] The casing (210) according to the present embodiment includes a cylindrical shell (211), an upper cap (212), and a lower cap (213). Accordingly, the internal space (210a) of the casing (210) can be divided into an upper space (210b) provided on the inside of the upper cap (212), an intermediate space (210c) provided on the inside of the cylindrical shell (211), and a lower space (210d) provided on the inside of the lower cap (213) based on the flow order of the refrigerant. Hereinafter, the upper space (210b) can be defined as a discharge space, the intermediate space (210c) as an oil separation space, and the lower space (210d) as a storage space (S11). In addition, the storage space (S11) can be divided into an upper storage space (S111) and a lower storage space (S112).

[0226] The cylindrical shell (211) has a cylindrical shape with both upper and lower ends open, and a drive motor (220) is press-fitted and fixed to the lower half and a main frame (230) is press-fitted and fixed to the upper half of the inner surface of the cylindrical shell (211).

[0227] A refrigerant discharge pipe (216) is connected by penetrating through the intermediate space (210c) of the cylindrical shell (211), specifically between the driving motor (220) and the main frame (230).

[0228] The upper cap (212) is coupled to cover the open upper portion of the cylindrical shell (211). A refrigerant suction pipe (215) is coupled to the upper cap (212) by passing through it, and the refrigerant suction pipe (215) passes through the upper space (210b) of the casing (210) and is directly connected to a suction pressure chamber (not shown) of a compression unit to be described later. Accordingly, the refrigerant can be supplied to the suction chamber (or suction pressure chamber) through the refrigerant suction pipe (215).

[0229] The lower cap (213) is coupled to cover the opened lower end of the cylindrical shell (211). The lower space (210d) of the lower cap (213) forms a reservoir space (S11), and a preset amount of oil is stored in the reservoir space (S11). The lower space (210d) forming the reservoir space (S11) is connected to the upper space (210b) and the intermediate space (210c) of the casing (210) through an oil return passage (not shown). Accordingly, the oil separated from the refrigerant in the upper space (210b) and the intermediate space (210c) and the oil supplied to the compression unit and then recovered can be recovered and stored in the lower space (210d) forming the reservoir space (S11) through the oil return passage.

[0230] The driving motor (220) is installed in the lower half of the intermediate space (210c) forming the high-pressure section in the internal space (210a) of the casing (210), and includes a stator (221) and a rotor (222).

[0231] The stator (221) includes a stator core (2211) and a stator coil (2212).

[0232] The stator core (2211) is formed into a cylindrical shape and is fixed to the inner surface of the cylindrical shell (211) by hot pressing. The stator coil (2212) is wound around the stator core (2211) and is electrically connected to an external power source through a terminal (not shown) that is connected through the casing (210).

[0233] On the outer surface of the stator core (2211), a plurality of recessed surfaces formed in a D-cut shape along the longitudinal direction can be formed at predetermined intervals along the circumferential direction.

[0234] A refrigerant passage (refrigerant movement passage) (not given a symbol) through which refrigerant passes is provided between one of the plurality of recessed surfaces and the inner surface of the cylindrical shell (211). The refrigerant passage communicates with the refrigerant movement groove (2712) of the upper guide member (271) described later. The refrigerant discharged from the compression section can sequentially pass through the refrigerant movement groove (2712) of the upper guide member (271) and the refrigerant passage of the stator core (2211) and move to the storage space (S11).

[0235] The rotor (222) includes a rotor core (2221) and a permanent magnet (2222).

[0236] The rotor core (2221) is formed in a cylindrical shape and is rotatably inserted into the interior of the stator core (2211) at a predetermined gap interval. Permanent magnets (2222) are embedded in the interior of the rotor core (2221) at a predetermined gap interval along the circumference.

[0237] The rotation shaft (225) is press-fitted and coupled to the rotor (222). The upper end of the rotation shaft (225) is rotatably inserted into a main frame (230) to be described later and supported radially, and the lower end of the rotation shaft (225) is rotatably inserted into a sub-frame (218) and supported radially and axially.

[0238] An eccentric portion (2251) is provided at the top of the rotation shaft (225), to which the rotation shaft coupling portion (253) of the rotary scroll (250) described later is coupled.

[0239] An oil supply hole (2255) is formed inside the rotating shaft (225) by penetrating between the two ends of the rotating shaft (225). The oil supply hole (2255) is formed by penetrating from the lower end of the rotating shaft (225) to the bottom surface of the eccentric portion (2251). Accordingly, oil stored in the oil storage space (S11) can be supplied to the inside of the eccentric portion (2251) through the oil supply hole (2255).

[0240] An oil pickup (226) is installed at the bottom of the rotating shaft (225), or more precisely, at the bottom of the oil supply hole (2255). The oil pickup (226) can be installed so as to be immersed in the oil stored in the oil storage space (S11). Accordingly, the oil stored in the oil storage space (S11) can be pumped by the oil pickup (226) and sucked up through the oil supply hole (2255).

[0241] The main frame (230) is installed on the upper side of the driving motor (220).

[0242] The main frame (230) includes a main flange portion (231), an axial support portion (232), and a back pressure space portion (233).

[0243] The main flange portion (231) is a portion that axially supports a turning scroll (250) to be described later, and is formed in an annular shape and accommodated in an intermediate space (210c) of a cylindrical shell (211). For example, a scroll support surface (234) forming a thrust bearing surface may be formed on the upper surface of the main flange portion (231). Accordingly, the lower surface (or back surface) of the turning plate portion (251) to be described later may be slidably placed on the scroll support surface (234) and supported in the axial direction.

[0244] The shaft support protrusion (232) extends from the center of the main flange portion (231) toward the driving motor (220), and a shaft support hole is formed on the inside of the shaft support protrusion (232). The shaft support hole may be formed by penetrating both axial side surfaces of the main flange portion (231). Accordingly, the main flange portion (231) may be formed in an annular shape.

[0245] The back pressure space (233) is a part that forms a back pressure room (S), and can be formed in a ring shape by being sunken to a preset depth from the edge of the scroll support surface (234).

[0246] The fixed scroll (240) includes a fixed plate portion (241), a fixed side wall portion (242), and a fixed wrap (243).

[0247] The fixed plate portion (241) is formed in a circular shape. The outer surface of the fixed plate portion (241) may be in close contact with the inner surface of the upper cap (212) forming the upper space (210b) or may be spaced apart from the inner surface of the upper cap (212).

[0248] An inlet (2411) is formed at the edge of the fixed plate (241) in the axial direction and is connected to a suction pressure chamber (not shown), and a refrigerant suction pipe (215) that penetrates the upper cap (212) of the casing (210) is inserted and connected to the inlet (2411). Accordingly, the refrigerant suction pipe (215) can pass through the upper space (210b) of the casing (210) and be directly connected to the inlet (2411) of the fixed scroll (240).

[0249] A discharge port (2412) and a bypass hole (not shown) are formed in the center of the fixed plate portion (241), and a discharge valve (245) for opening and closing the discharge port (2412) and a bypass valve (not shown) for opening and closing the bypass hole may be installed on the back surface of the fixed plate portion (241). Accordingly, the refrigerant compressed in the first compression chamber (V1) and the second compression chamber (V2) is discharged from the upper side of the fixed scroll (240) to the upper space (210b) formed in the upper cap (212). The compression chamber formed between the outer surface of the rotating wrap (252) and the inner surface of the fixed wrap (243) facing it can be defined as the first compression chamber (V1), and the compression chamber formed between the inner surface of the rotating wrap (252) and the outer surface of the fixed wrap (243) facing it can be defined as the second compression chamber (V2).

[0250] The fixed side-wall portion (242) can extend in an annular shape from the edge of the fixed plate portion (241) toward the main frame (230). Accordingly, the fixed side-wall portion (242) can be bolted so that its lower surface is in close contact with the upper surface of the main frame (230), i.e., the upper surface of the main flange portion (231).

[0251] The fixed wrap (243) extends from the lower surface of the fixed plate portion (241) toward the rotating scroll (250). The fixed wrap (243) can be formed in various shapes such as an involute.

[0252] The rotary scroll (250) may include a rotary plate portion (251), a rotary wrap (252), and a rotary shaft coupling portion (253).

[0253] The pivot plate (251) is formed in a disc shape and is axially supported by the main frame (230) so as to pivot between the main frame (230) and the fixed scroll (240). In other words, the lower surface of the pivot plate (251) forms a thrust bearing surface (B1) together with the scroll support surface (234) of the main frame (230).

[0254] The orbiting wrap (252) extends from the upper surface (compression surface) of the orbiting plate (251) toward the fixed scroll (240). Accordingly, the orbiting wrap (252) can be interlocked with the fixed wrap (243) to form two pairs of compression chambers (V1) (V2).

[0255] The pivoting wrap (252) can be formed in various shapes, such as an involute, to correspond to the fixed wrap (243).

[0256] The rotary shaft coupling portion (253) can extend from the geometric center of the orbiting scroll (250) toward the eccentric portion (2251) of the rotary shaft (225). The rotary shaft coupling portion (253) can be rotatably inserted into the eccentric portion (2251) of the rotary shaft (225). Accordingly, the orbiting scroll (250) is caused to rotate by the eccentric portion (2251) of the rotary shaft (225) and the rotary shaft coupling portion (253).

[0257] In Fig. 7, reference numeral 260 indicates an Oldham ring.

[0258] The operational effects of the scroll compressor (200) according to another embodiment of the present invention as described above are as follows.

[0259] When power is applied to the driving motor (220) and rotational force is generated, the rotary scroll (250) eccentrically coupled to the rotary shaft (225) rotates relative to the fixed scroll (240) by the old ring (260). At this time, a first compression chamber (V1) and a second compression chamber (V2) that move continuously are formed between the fixed scroll (240) and the rotary scroll (250).

[0260] Then, the first compression chamber (V1) and the second compression chamber (V2) gradually become narrower in volume as the rotating scroll (250) moves from the suction port (or suction pressure chamber) (2411) toward the discharge port (or discharge pressure chamber) (2412) during the rotating motion.

[0261] Then, the refrigerant is introduced into the first compression chamber (V1) and the second compression chamber (V2) through the refrigerant suction pipe (215) and the suction port (2411) of the fixed scroll (240), and the refrigerant is compressed while moving toward the final compression chamber by the orbiting scroll (250). The refrigerant is discharged from the final compression chamber into the upper space (210b) of the casing (210) through the discharge port (2412) of the fixed scroll (240), and the refrigerant moves into the intermediate space (210c) and / or the lower space (210d) of the casing (210) through the discharge passage (refrigerant movement passage) (not given a symbol) provided in the fixed scroll (240) and the main frame (230).

[0262] Then, the refrigerant circulates through the internal space (210a) of the casing (210), and the oil is separated from the refrigerant. The refrigerant from which the oil has been separated is discharged to the outside of the casing (210) through the refrigerant discharge pipe (216), while the oil separated from the refrigerant moves to the oil storage space (S11) forming the lower space (210d) of the casing (210) and is stored therein, and then supplied to the compression unit through the oil pickup (226) and the oil supply hole (2255) of the rotating shaft (225), repeating a series of processes.

[0263] The scroll compressor according to the fourth embodiment and the fifth embodiment of the present invention described below includes a refrigerant discharge passage that opens and closes according to changes in temperature. The refrigerant discharge passage is applied to the scroll compressor (200) illustrated in FIG. 7.

[0264] <Example of the 4th implementation state>

[0265] Fig. 9 is a schematic diagram illustrating a refrigerant discharge path of a scroll compressor according to an example of a fourth embodiment of the present invention. The refrigerant discharge path is opened and closed according to changes in temperature.

[0266] Referring to FIGS. 7 to 9, a scroll compressor (200) according to an example of the fourth embodiment of the present invention includes a refrigerant discharge path.

[0267] The refrigerant discharge path is a path that allows the refrigerant discharged through the discharge path (refrigerant movement path) provided in the main frame (230) to pass through the compression unit, the drive motor (220), and the subframe (218) and join with the oil stored in the oil storage space (S11).

[0268] The refrigerant discharge path includes an upper guide member (271), a lower guide member (272), a foaming prevention member (273), and an on-off valve (274).

[0269] The upper guide member (271) may be formed identically or similarly to the upper guide member (271) illustrated in Fig. 8. Fig. 8 is an example showing the upper guide member (271).

[0270] The upper guide member (271) is formed in a plate shape with a preset thickness.

[0271] The upper guide member (271) has a preset length in one direction (longitudinal direction, up-down direction in FIG. 8) and a preset width in the other direction (width direction, direction orthogonal to one direction).

[0272] The upper guide member (271) includes a refrigerant movement groove (2712).

[0273] The refrigerant moving groove (2712) is a recess formed by being sunken to a preset depth, and is formed along the length direction of the upper guide member (271).

[0274] The refrigerant moving home (2712) can be formed by a plurality of bends (2711) spaced apart at a preset distance.

[0275] The upper guide member (271) is positioned so that its longitudinal direction is the same direction as the direction of the rotation axis (225) of the driving motor (220). In addition, the bottom surface of the refrigerant movement groove (2712) is positioned so as to face the inner surface of the casing (210). The direction of the rotation axis (225) indicates the direction in which the rotation axis (225) is positioned or the longitudinal direction of the rotation axis (225).

[0276] The upper guide member (271) can be joined to the inner surface of the casing (210). For example, the widthwise ends (271S3, 271S4) of the upper guide member (271) can be joined to the inner surface of the cylindrical shell (211) by welding or the like.

[0277] The refrigerant can move along the refrigerant moving groove (2712). Specifically, the refrigerant can move from the compression section side to the drive motor (220) side along the refrigerant moving passage (refrigerant moving groove (2712)) surrounded by the upper guide member (271) and the casing (210) (specifically, the cylindrical shell (211)).

[0278] The upper guide member (271) is placed between the main frame (230) and the stator (221) (specifically, the stator core (2211)).

[0279] Specifically, one longitudinal side (271S1) of the upper guide member (271) faces toward the main frame (230), and the other longitudinal side (271S2) of the upper guide member (271) faces toward the driving motor (220).

[0280] The upper guide member (271) communicates with the discharge passage (refrigerant movement passage) formed in the main frame (230). That is, one longitudinal side (271S1) of the upper guide member (271) communicates with the discharge passage of the main frame (230). The refrigerant (or part of the refrigerant) passing through the discharge passage of the main frame (230) enters the refrigerant movement groove (2712) of the upper guide member (271).

[0281] In addition, the upper guide member (271) communicates with the refrigerant passage (refrigerant movement passage) formed in the stator core (2211). That is, the other side (271S2) in the longitudinal direction of the upper guide member (271) communicates with the refrigerant passage of the stator core (2211). The refrigerant (or part of the refrigerant) that passes through the refrigerant movement groove (2712) of the upper guide member (271) enters the refrigerant passage of the stator core (2211).

[0282] The stator core (2211) of the driving motor (220) is placed on the other side (bottom in Fig. 7) of the upper guide member (271).

[0283] Among the stator cores (2211), the edge-side end of the stator core (2211) disposed on the other side (bottom in FIG. 7) of the upper guide member (271) can be cut (e.g., D-cut) in the same direction as the direction of the rotation axis (225) of the driving motor (220).

[0284] Accordingly, a coolant passage (coolant movement passage) can be formed at the edge side end of the stator core (2211) in the same direction as the direction of the rotation axis (225) of the drive motor (220).

[0285] The refrigerant (or part of the refrigerant) that has passed through the refrigerant movement groove (2712) of the upper guide member (271) can pass through the refrigerant passage of the stator core (2211) and then move toward the storage space (S11).

[0286] The lower guide member (272) can be formed identically or similarly to the upper guide member (271) illustrated in FIG. 8.

[0287] Hereinafter, when describing the lower guide member (272), components or parts that are distinct from the aforementioned upper guide member (271) are specifically described, and identical or similar components or parts are replaced with the contents described in the upper guide member (271).

[0288] The refrigerant movement groove (2712) formed in the upper guide member (271) may be named a ‘first refrigerant movement groove (2712)’, and the refrigerant movement groove formed in the lower guide member (272) may be named a ‘second refrigerant movement groove’.

[0289] The lower guide member (272) can be joined to the inner surface of the casing (210). For example, both ends of the lower guide member (272) in the width direction can be joined to the inner surface of the cylindrical shell (211) by welding or the like.

[0290] The refrigerant can move along the second refrigerant movement groove. Specifically, the refrigerant can move from the stator (221) side to the storage space (S11) side along the refrigerant movement passage (second refrigerant movement groove) surrounded by the lower guide member (272) and the casing (210) (specifically, the cylindrical shell (211)).

[0291] The lower guide member (272) is placed between the stator (221) (specifically, the stator core (2211)) and the anti-forming member (273) described later.

[0292] Specifically, one longitudinal side of the lower guide member (272) faces the stator (221) (specifically, the stator core (2211)), and the other longitudinal side of the lower guide member (272) faces the anti-foaming member (273).

[0293] The lower guide member (272) communicates with a refrigerant passage (refrigerant movement passage) formed in the stator core (2211). That is, one longitudinal side of the lower guide member (272) communicates with the refrigerant passage of the stator core (2211). The refrigerant (or part of the refrigerant) passing through the refrigerant passage of the stator core (2211) enters the refrigerant movement groove of the lower guide member (272).

[0294] In addition, the lower guide member (272) communicates with a refrigerant movement hole (273h1) formed in a foaming prevention member (273) described later. That is, the other side in the longitudinal direction of the lower guide member (272) communicates with the refrigerant movement hole (273h1) formed in the foaming prevention member (273). The refrigerant (or part of the refrigerant) that passes through the refrigerant movement groove of the lower guide member (272) enters the refrigerant movement hole (273h1) formed in the foaming prevention member (273).

[0295] The anti-foaming member prevents foam generated on the surface of oil contained in the storage space (S11) from moving to the refrigerant discharge pipe (216), thereby suppressing oil discharge.

[0296] The anti-foaming member (273) is placed in the storage space (S11).

[0297] The storage space (S11) is a space of a preset size that is placed on the opposite side of the space where the compression unit is placed, with the drive motor (220) in between.

[0298] The oil storage space (S11) accommodates a subframe (218), a part of the rotation shaft (225) of the drive motor (220), a foaming prevention member (273), an on-off valve (274), and oil.

[0299] The forming prevention member (273) is formed into a plate shape with a preset thickness.

[0300] The anti-foaming member (273) is fastened to one side of the sub-frame (218) (e.g., as shown in FIG. 7). The fastening can be accomplished by screws or welding, etc.

[0301] The anti-foaming member (273) is not limited to a specific shape, and can be combined with the sub-frame (218) to define a storage space (S11). That is, the storage space (S11) can be defined by the combination of the anti-foaming member (273) and the sub-frame (218).

[0302] For example, the storage space (S11) can be partitioned by a foaming prevention member (273).

[0303] Specifically, the storage space (S11) can be partitioned into one side (upper side in FIG. 7) and the other side (lower side in FIG. 7) of the forming prevention member (273).

[0304] Among the oil storage spaces (S11), one side (upper side in FIG. 7) of the foaming prevention member (273) is a space where the subframe (218) is arranged (upper space (S111) of the oil storage space (S11), oil upper space (S111)), and the other side (lower side in FIG. 7) of the foaming prevention member (273) is a space where oil is arranged (lower space (S112) of the oil storage space (S11), oil lower space (S112)).

[0305] The anti-foaming member (273) includes a refrigerant movement hole (273h1).

[0306] The refrigerant movement hole (273h1) is a hole that penetrates the anti-foaming member (273).

[0307] The refrigerant movement hole (273h1) is a passage connecting the upper space of the oil reservoir (S111) and the lower space of the oil reservoir (S112).

[0308] The refrigerant movement hole (273h1) is positioned below the other side in the longitudinal direction of the lower guide member (272).

[0309] The refrigerant movement hole (273h1) communicates with the refrigerant movement groove of the lower guide member (272). In addition, a gap (upper space side hole) (H) of a preset size can be formed between the anti-foaming member (273) and the other side in the longitudinal direction of the lower guide member (272).

[0310] Accordingly, some of the refrigerant that has passed through the refrigerant movement groove of the lower guide member (272) can move to the lower oil storage space (S112) through the refrigerant movement hole (273h1) of the anti-foaming member (273), and some of the other refrigerant that has passed through the refrigerant movement groove can move to the upper oil storage space (S111) through the upper space-side hole (H).

[0311] The anti-foaming member (273) further includes one or more through holes (273h2) in addition to the refrigerant movement holes (273h1) (see FIG. 7).

[0312] Through one or more of the through holes (273h2) of the anti-foaming member (273), the oil that has moved to the compression section can again join with the oil contained in the lower oil storage space (S112).

[0313] In addition, the refrigerant that enters the lower oil storage space (S112) through the refrigerant movement hole (273h1) of the anti-foaming member (273) can move to the upper oil storage space (S111) through the one or more through holes (273h2) of the anti-foaming member (273). The refrigerant that has moved to the upper oil storage space (S111) can move across the drive motor (220) to the refrigerant discharge pipe (216).

[0314] The opening / closing valve (274) opens and closes the refrigerant movement hole (273h1) of the anti-foaming member (273).

[0315] The on-off valve (274) is the same as or similar to the bimetallic valve (180) applied to the scroll compressor (100) according to the example of the second embodiment of the present invention described above. That is, the on-off valve (274) is a type of bimetallic valve.

[0316] The opening / closing valve (274) is formed by overlapping and joining a first plate (2741) and a second plate (2742) having different thermal expansion coefficients. The first plate (2741) and the second plate (2742) are metal plates.

[0317] The first plate (2741) and the second plate (2742) are thin, narrow, and long in one direction.

[0318] The first plate (2741) and the second plate (2742) may be joined into one body by welding, or may be joined by soldering or mechanical fastening (riveting).

[0319] The opening / closing valve (274) of the present invention bends when the temperature decreases.

[0320] When the temperature of the opening / closing valve (274) is lowered (low temperature state), the first plate (2741) contracts, and the first plate (2741) and the second plate (2742) are bent toward the first plate (2741).

[0321] And, when the temperature of the opening / closing valve (274) increases (high temperature state, normal state), the first plate (2741) expands, and the first plate (2741) and the second plate (2742) bend toward the second plate (2742).

[0322] The opening / closing valve (274) is positioned to cover the refrigerant movement hole (273h1) of the anti-foaming member (273).

[0323] The opening / closing valve (274) is fastened to one side of the forming prevention member (273) facing the lower space of the oil reservoir (S112).

[0324] For example, one side of the opening / closing valve (274) and one side of the anti-foaming member (273) may be connected by a fastening member such as a bolt and a nut, or a screw. In an example of this embodiment, a fastening hole in which a fastening member is placed may be formed in each of one side of the opening / closing valve (274) and one side of the anti-foaming member (273).

[0325] Alternatively, for example, one side of the opening / closing valve (274) and one side of the forming prevention member (273) may be joined by welding or soldering.

[0326] The first plate (2741) of the opening / closing valve (274) is arranged to face the oil side accommodated in the lower oil space (S112), and the second plate (2742) is arranged to face the refrigerant movement hole (273h1) side of the anti-foaming member (273).

[0327] In a low temperature state, the opening / closing valve (274) opens the refrigerant movement hole (273h1) of the anti-foaming member (273).

[0328] That is, in a low temperature state, the first plate (2741) of the opening / closing valve (274) contracts, so the first plate (2741) and the second plate (2742) bend toward the first plate (2741). Accordingly, the refrigerant movement hole (273h1) of the foaming prevention member (273) opens.

[0329] Some of the refrigerant that has passed through the refrigerant movement groove of the lower guide member (272) moves to the lower oil storage space (S112) through the refrigerant movement hole (273h1) of the anti-foaming member (273) and is mixed with the oil contained in the lower oil storage space (S112). Due to the mixing of the refrigerant and the oil, the viscosity of the oil is reduced and the superheating degree of the oil is quickly secured.

[0330] At high temperature, the opening / closing valve (274) closes (covers) the refrigerant movement hole (273h1) of the anti-foaming member (273).

[0331] That is, when the temperature rises from a low temperature state to a high temperature state (or, normal state) due to the operation of the compressor, the first plate (2741) expands, and the first plate (2741) and the second plate (2742) bend toward the second plate (2742). Accordingly, the refrigerant movement hole (273h1) of the foaming prevention member (273) is closed.

[0332] The refrigerant that has passed through the refrigerant movement groove of the lower guide member (272) cannot move to the lower oil storage space (S112) through the refrigerant movement hole (273h1) of the anti-foaming member (273). In addition, the refrigerant in the lower oil storage space (S112) cannot move to the upper oil storage space (S111) through the refrigerant movement hole (273h1) of the anti-foaming member (273), so that the amount of oil contained in the oil storage space (S11) is maintained constant.

[0333] <Example of the 5th implementation state>

[0334] Fig. 10 illustrates another embodiment of a lower guide member arranged in the scroll compressor (200) of Fig. 7, and Fig. 11 schematically illustrates a refrigerant discharge path of a scroll compressor according to an example of a fifth embodiment of the present invention. The refrigerant discharge path is opened and closed according to changes in temperature.

[0335] Referring to FIGS. 7, 10 and 11, a scroll compressor according to an example of the fifth embodiment of the present invention includes a refrigerant discharge path.

[0336] The scroll compressor according to the fifth embodiment of the present invention described below differs from the scroll compressor (200) according to the fourth embodiment of the present invention described above only in the lower guide member (280), the anti-foaming member (273), and the opening / closing valve (274).

[0337] Therefore, in the scroll compressor according to the example of the fifth embodiment of the present invention, other components except for the lower guide member (280), the anti-foaming member (273), and the opening / closing valve (274) are the same as or similar to the components of the scroll compressor (200) according to the example of the fourth embodiment of the present invention, and therefore, the specific description of the other components is replaced with the above-mentioned content.

[0338] The scroll compressor according to the fifth embodiment of the present invention does not have the opening / closing valve (274) provided in the scroll compressor (200) according to the fourth embodiment of the present invention.

[0339] The lower guide member (272) and the anti-foaming member (273) of the scroll compressor (200) according to the example of the fourth embodiment of the present invention described above may be named as 'first lower guide member (272)' and 'first anti-foaming member (273)', as needed.

[0340] In addition, the lower guide member (280) and the anti-foaming member (273) provided in the scroll compressor according to the example of the fifth embodiment of the present invention are named as 'second lower guide member (280)' and 'second anti-foaming member (273)' to distinguish them from the first lower guide member (272) and the first anti-foaming member (273) provided in the scroll compressor (200) according to the example of the fourth embodiment of the present invention.

[0341] The first forming prevention member (273) and the second forming prevention member (273) do not have a significant difference from each other, so they use the same drawing symbols.

[0342] The second lower guide member (280) can be formed identically or similarly to the upper guide member (271) illustrated in FIG. 8.

[0343] Hereinafter, in describing the second lower guide member (280), components or parts that are distinct from the aforementioned upper guide member (271) are specifically described, and identical or similar components or parts are replaced with the contents described in the upper guide member (271).

[0344] The refrigerant moving groove formed in the upper guide member (271) may be named as a ‘first refrigerant moving groove (2712)’, and the refrigerant moving groove formed in the second lower guide member (280) may be named as a ‘third refrigerant moving groove’.

[0345] The second lower guide member (280) can be joined to the inner surface of the casing (210). For example, both ends of the second lower guide member (280) in the width direction can be joined to the inner surface of the cylindrical shell (211) by welding or the like.

[0346] The refrigerant can move along the third refrigerant movement groove. Specifically, the refrigerant can move from the stator (221) side to the storage space (S11) side along the refrigerant movement passage (third refrigerant movement groove) surrounded by the second lower guide member (280) and the casing (210) (specifically, the cylindrical shell (211)).

[0347] The second lower guide member (280) is placed between the stator (221) (specifically, the stator core (2211)) and the second forming prevention member (273) described later.

[0348] Specifically, one longitudinal side of the second lower guide member (280) faces the stator (221) (specifically, the stator core (2211)), and the other longitudinal side of the second lower guide member (280) faces the second forming prevention member (273).

[0349] The second lower guide member (280) communicates with a refrigerant passage (refrigerant movement passage) formed in the stator core (2211). That is, one longitudinal side of the second lower guide member (280) communicates with the refrigerant passage of the stator core (2211). The refrigerant (or a portion of the refrigerant) passing through the refrigerant passage of the stator core (2211) enters the third refrigerant movement groove.

[0350] In addition, the second lower guide member (280) communicates with the refrigerant movement hole (273h1) formed in the second forming prevention member (273) described later. That is, the other side in the longitudinal direction of the second lower guide member (280) communicates with the refrigerant movement hole (273h1) formed in the second forming prevention member (273). The refrigerant (or part of the refrigerant) that has passed through the third refrigerant movement groove enters the refrigerant movement hole (273h1) of the second forming prevention member (273).

[0351] The second lower guide member (280) changes shape depending on the temperature.

[0352] When the compressor is in a low temperature state, that is, when the second lower guide member (280) is in a low temperature state, the second lower guide member (280) is in a contracted state.

[0353] When the second lower guide member (280) is in a contracted state, the center portion of the second lower guide member (280) is spaced apart from the inner surface of the cylindrical shell (211) toward the rotational axis (225) of the driving motor (220), so that a larger space (coolant movement passage) is formed between the center portion of the second lower guide member (280) and the inner surface of the cylindrical shell (211). The center portion of the second lower guide member (280) refers to the space between the two ends in the width direction of the second lower guide member (280).

[0354] Accordingly, the refrigerant (or part of the refrigerant) that has passed through the refrigerant passage of the stator core (2211) enters more of the refrigerant movement groove of the second lower guide member (280). Thus, a larger amount of refrigerant enters the refrigerant movement hole (273h1) of the second forming prevention member (273).

[0355] As the compressor temperature rises to a certain level, the amount of refrigerant moving to the lower oil space (S112) increases, and a large amount of refrigerant mixes with the oil. Due to the mixing of refrigerant and oil, the viscosity of the oil decreases, and the superheat of the oil is quickly achieved.

[0356] And, as the temperature of the compressor rises due to the operation of the compressor (when the compressor is in a high temperature state (normal state)), the temperature of the second lower guide member (280) also rises. As the temperature of the second lower guide member (280) rises, the second lower guide member (280) gradually expands.

[0357] As the second lower guide member (280) gradually expands, the center portion of the second lower guide member (280) approaches the inner surface of the cylindrical shell (211) from the rotational axis (225) of the driving motor (220), so that a smaller space (coolant movement passage) is formed between the center portion of the second lower guide member (280) and the inner surface of the cylindrical shell (211).

[0358] Accordingly, the refrigerant (or part of the refrigerant) that has passed through the refrigerant passage of the stator core (2211) enters the refrigerant movement groove of the second lower guide member (280) in smaller amounts. Thus, the amount of refrigerant that enters the refrigerant movement hole (273h1) of the second forming prevention member (273) may be small or non-existent.

[0359] That is, when the temperature of the compression section rises (or the superheating of the oil is secured), the center portion of the second lower guide member (280) is pressed against the inner surface of the cylindrical shell (211), and the amount of refrigerant mixed with the oil is reduced.

[0360] And, as the temperature of the compressor decreases from a high temperature state, the temperature of the second lower guide member (280) also decreases, causing the second lower guide member (280) to gradually contract. Accordingly, the refrigerant movement passage surrounded by the inner surface of the second lower guide member (280) and the cylindrical shell (211) becomes wider.

[0361] The second forming prevention member (273) can be formed identically or similarly to the first forming prevention member (273) described above.

[0362] Hereinafter, in describing the second forming prevention member (273), components or parts that are distinct from the first forming prevention member (273) are specifically described, and identical or similar components or parts are replaced with the contents described in the first forming prevention member (273).

[0363] The second anti-foaming member (273) includes a refrigerant movement hole (273h1). The refrigerant movement hole (273h1) of the second anti-foaming member (273) may be referred to as a 'second refrigerant movement hole (273h1)'.

[0364] The second refrigerant movement hole (273h1) communicates with the refrigerant movement groove of the second lower guide member (280). In addition, a gap (upper space side hole) (H) of a preset size can be formed between the second forming prevention member (273) and the other side in the longitudinal direction of the second lower guide member (280).

[0365] Accordingly, some of the refrigerant that has passed through the refrigerant movement groove of the second lower guide member (280) can move to the lower oil storage space (S112) through the second refrigerant movement hole (273h1), and some of the refrigerant that has passed through the refrigerant movement groove can move to the upper oil storage space (S111) through the upper space-side hole (H).

[0366] The second refrigerant movement hole (273h1) of the second forming prevention member (273) may correspond to the cross-sectional shape of the second lower guide member (280). The cross-sectional shape represents the outer shape of the cut surface when the second lower guide member (280) is cut in a direction orthogonal to the longitudinal direction of the second lower guide member (280). In addition, the cross-sectional shape represents the cross-sectional shape when the second lower guide member (280) is in a low-temperature state.

[0367] Accordingly, in a low temperature state, the refrigerant (or part of the refrigerant) that has passed through the refrigerant movement groove of the second lower guide member (280) easily and in large quantities enters the second refrigerant movement hole (273h1) of the second forming prevention member (273).

Claims

1. Main frame placed on the lower side of the drive motor; A rotating scroll arranged on the lower side of the main frame and performing a rotating motion; A fixed scroll disposed below the above-mentioned rotating scroll and interlocked with the above-mentioned rotating scroll to form a compression chamber; and It includes a discharge cover that is arranged on the lower side of the fixed scroll and is formed to surround the fixed scroll, thereby forming a discharge space together with one side of the fixed scroll. A scroll compressor, wherein a refrigerant hole connecting the discharge space and the storage space is formed in the discharge cover, and a valve unit is mounted to open and close the refrigerant hole according to a change in temperature.

2. In paragraph 1, The above discharge cover includes a fastening portion, The above-mentioned fastening portion protrudes from one side of the discharge cover toward the storage space by a preset length, and a through hole communicating with the refrigerant hole is formed in the center. A bimetallic tube, which is the valve unit, is connected to the above-mentioned connecting portion, The above bimetallic tube is a scroll compressor that opens and closes the through hole according to temperature changes.

3. In paragraph 2, The above bimetallic tube, A tube member formed in a rod shape having a preset length in one direction and coupled to the above-mentioned fastening portion, and having a first hole and a second hole formed therein; and It includes a filler member that is accommodated in the first hole and opens and closes the through hole of the fastening part, The above filler member is a scroll compressor that contracts or expands according to temperature changes.

4. In paragraph 3, The above first hole is formed from one side of one end to the other end in the longitudinal direction of the tube member, A scroll compressor, wherein the second hole is in communication with the first hole and is formed on a side surface of the other end of the tube member.

5. In paragraph 3, The above filler member shrinks when the temperature decreases, so that a space is formed between one end of the filler member and the through hole of the fastening member, and the space is in communication with the first hole. A scroll compressor in which the refrigerant in the discharge space of the discharge cover passes through the refrigerant hole of the discharge cover, the through hole of the fastening member, and the first hole and the second hole of the tube member, and moves to the storage space.

6. In paragraph 1, A bimetallic valve, which is the valve unit, is attached to one side of the above discharge cover, The above bimetallic valve opens the refrigerant hole of the discharge cover when the temperature drops, a scroll compressor.

7. In paragraph 1, A temperature-sensitive valve, which is the valve unit, is attached to one side of the above discharge cover, The above temperature sensitive valve is a scroll compressor that opens the refrigerant hole of the discharge cover when the temperature drops.

8. In paragraph 7, The above temperature sensitive valve, A valve housing having an internal space, including a cover-side hole communicating with a refrigerant hole of the discharge cover and a storage-space-side hole communicating with the storage space; A movable member that is movable in the internal space and opens and closes the refrigerant hole of the discharge cover; An elastic member coupled to the above movable member and supporting the above movable member; A diaphragm member supporting the above movable member; and A scroll compressor, comprising a working fluid accommodated inside the diaphragm member and having a volume that changes when the temperature changes.

9. In paragraph 8, A scroll compressor in which the working fluid contracts when the temperature decreases, the diaphragm member moves away from the cover-side hole, and the moving member moves away from the cover-side hole to open the refrigerant hole of the discharge cover.

10. A drive motor coupled to the inner surface of the case and rotating the rotation shaft; A compression unit disposed on the upper side of the above driving motor and having a main frame, a rotating scroll, and a fixed scroll to compress and discharge refrigerant; A sub-frame disposed in a storage space formed at the lower side of the driving motor and rotatably supporting the lower end of the rotation shaft; and It includes a refrigerant discharge path that allows the refrigerant discharged through the discharge passage (refrigerant movement passage) provided in the main frame to pass through the compression unit, the drive motor, and the subframe, and join with the oil stored in the storage space. A scroll compressor in which the above refrigerant discharge path is opened and closed according to changes in temperature.

11. In paragraph 10, The above refrigerant discharge path is, An upper guide member disposed between the main frame and the stator core of the driving motor, and including a first refrigerant moving groove communicating with the discharge passage of the main frame and the refrigerant passage of the stator core, respectively; A foaming prevention member fastened to one side of the above subframe and having a refrigerant movement hole formed therein; and A scroll compressor comprising a lower guide member disposed between the stator core and the anti-foaming member and including a second refrigerant movement groove each communicating with a refrigerant passage of the stator core and a refrigerant movement hole of the anti-foaming member.

12. In paragraph 11, The lower guide member contracts when the temperature decreases, and the center portion of the lower guide member is spaced apart from the inner surface of the case toward the rotational axis of the drive motor, so that a refrigerant movement passage is formed between the center portion of the lower guide member and the inner surface of the case, a scroll compressor.

13. In paragraph 11, A scroll compressor in which the lower guide member expands as the temperature increases, so that the central portion of the lower guide member approaches the inner peripheral surface of the case from the rotational axis of the drive motor, so that the central portion of the lower guide member and the inner peripheral surface of the case come into contact.

14. In paragraph 11, It further includes an opening / closing valve that is fastened to one side of the above-mentioned foaming prevention member and opens / closes the refrigerant movement hole of the above-mentioned foaming prevention member, The above-mentioned opening / closing valve is a scroll compressor that opens the refrigerant movement hole when the temperature drops.

15. In paragraph 11, A gap (upper space side hole) of a preset size is formed between one longitudinal end of the above-mentioned forming prevention member and the lower guide member, A scroll compressor, wherein some of the refrigerant that has passed through the second refrigerant movement groove can move to the lower space of the low-oil reservoir through the refrigerant movement hole of the foaming prevention member, and other of the refrigerant that has passed through the second refrigerant movement groove can move to the upper space of the low-oil reservoir through the gap (upper space side hole) of a preset size.

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