Scroll compressor

Abstract

The present invention relates to a scroll compressor. The present invention may comprise: a compression unit (3) having formed therein a compression chamber in which a refrigerant is compressed; and a support member (24) disposed between a suction port (21) and a discharge port (22) with respect to the axial direction. Here, the support member (24) and a first end plate portion (310) of a first scroll (31) constituting the compression unit (3) are connected to each other in the axial direction, and thus the support member (24) may support the axial movement of the first scroll (31). As a result, the mounting position of the first scroll (31) may be moved from the conventional radially outer periphery to the upper portion of the first scroll (31). Accordingly, a portion for coupling at the radially outer periphery of the first scroll (31) may be eliminated, and the inner diameter of the compressor may be reduced, and thus the compressor may be miniaturized.

Description

Scroll compressor

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

[0002] Generally, a compressor refers to a mechanical device used for generating high pressure or transporting high-pressure fluids. Among these, compressors applied to vapor compression refrigeration cycles, such as those found in refrigerators and air conditioners, perform the function of compressing the refrigerant and transferring it to the condenser. These compressors can be classified into reciprocating, rotary, and scroll types depending on the method of compressing the refrigerant.

[0003] The scroll compressor corresponds to the scroll type. In the scroll compressor, a rotating scroll and a non-rotating scroll are arranged to interlock within the internal space of the case. When the rotating scroll rotates while the two scrolls are interlocked in this manner, the volume of the compression chamber gradually decreases, and simultaneously, the refrigerant flows radially inward and is compressed. The compressed refrigerant is discharged into the discharge space through a discharge port formed axially on the non-rotating scroll. In this process, the suction, compression, and discharge of the refrigerant can be performed continuously and repeatedly.

[0004] In a scroll compressor, it is important to ensure that the rotating scroll and the non-rotating scroll are in axial contact with each other to increase the airtightness of the compression chamber. To this end, a structure providing back pressure may be added to bring the rotating scroll and the non-rotating scroll into close contact with each other. Such a back pressure structure includes (i) a non-rotating scroll back pressure method (fixed back pressure method) that pressurizes the non-rotating scroll toward the rotating scroll, and (ii) a rotating scroll back pressure method (rotating back pressure method) that pressurizes the rotating scroll toward the non-rotating scroll.

[0005] In order to implement the above fixed back pressure method, it is necessary to fix the non-rotating scroll so that it can move in the axial direction. Conventionally, a structure was used in which the non-rotating scroll was connected to the main frame by a guide bushing to guide the axial movement of the non-rotating scroll. By means of the guide bushing, the non-rotating scroll can be mounted to the main frame in a state where it can move in the axial direction.

[0006] However, since these guide bushes are installed on the outer portion that protrudes radially further from the edge of the non-swivel scroll, there is a problem in that the diameters of the non-swivel scroll and the main frame increase. As a result, additional radial space is required inside the compressor for the installation of the guide bushes, which increases the size of the compressor. In other words, due to the space required for the installation of the guide bushes, there is a limit to increasing the proportion of the compressor chamber within the internal space of the compressor.

[0007] The present invention is intended to solve the problems of the prior art as described above. The objective of the present invention is to ensure that a guide structure for axial movement of a non-rotating scroll (first scroll) is formed on the axial upper side of the first scroll, rather than on the radial outer side.

[0008] Another objective of the present invention is to simplify the structure for guiding the axial movement of a non-rotating scroll and to reduce the number of parts.

[0009] According to the features of the present invention for achieving the above-mentioned purpose, the present invention may include a compression section having a compression chamber formed therein for compressing a refrigerant, and a support member disposed between the suction port and the discharge port with respect to the axial direction. At this time, the support member and the first end plate of the first scroll constituting the compression section are connected to each other in the axial direction, so that the support member can support the axial movement of the first scroll. In this way, the mounting position of the first scroll can be moved from the existing radial outer edge to the upper part of the first scroll. Accordingly, the part for coupling at the radial outer edge of the first scroll can be omitted, and the inner diameter of the compressor can be reduced to achieve miniaturization.

[0010] The support member and the first end plate may be provided with a guide pin and a guide sleeve connected to each other in the axial direction.

[0011] The guide pin and the guide sleeve can be joined to each other at a radially inner side of the radial edge of the first wrap.

[0012] The support member may be provided with a guide pin protruding in the axial direction. The first end plate may be provided with a guide sleeve that protrudes in the axial direction and into which the guide pin is inserted in the axial direction.

[0013] The inlet of the guide sleeve is open in the axial direction, and the guide pin can move axially along the guide sleeve.

[0014] The guide pin may include a plurality of guide pins arranged at equal intervals along the edge of the support member. At this time, the guide sleeve may include a plurality of guide sleeves arranged at equal intervals along the edge of the first end plate portion.

[0015] The support member may be provided with a guide sleeve protruding in the axial direction. The first end plate may be provided with a guide pin that protrudes in the axial direction and is inserted axially into the guide sleeve.

[0016] A discharge space connected to the discharge port may be defined at the upper part of the support member. A low-pressure space connected to the suction port may be defined at the lower part of the support member. A connection portion connecting the support member and the first scroll may be disposed in the low-pressure space.

[0017] Based on the first end plate portion, the connection portion between the support member and the first scroll and the first wrap may be positioned on opposite sides in the axial direction.

[0018] A discharge connection hole may be formed in the center of the support member. A plurality of guide pins may be arranged around the discharge connection hole.

[0019] A back pressure plate may be disposed on the upper part of the first scroll. A plurality of guide sleeves may be disposed around the back pressure plate.

[0020] The support member may be positioned between the compression part and the discharge port with respect to the axial direction.

[0021] The internal space of the above case can be divided into a low-pressure section and a high-pressure section by the support member.

[0022] The first scroll may include the first end plate portion and the first lap protruding along the axial direction from the first surface of the first end plate portion. The first scroll may further include a guide sleeve protruding in the opposite direction to the first lap along the axial direction from the second surface of the first end plate portion. In this case, the guide sleeve may be connected to a guide pin of the support member.

[0023] The support member may include a base plate having a discharge connection hole formed therein for passing refrigerant discharged from the compression chamber; and a side plate provided along the edge of the base plate and extending axially from the edge of the base plate. In this case, a guide pin may protrude axially from the base plate, and the guide pin may be disposed in a space enclosed by the side plate.

[0024] A discharge space connected to the discharge port may be formed on the upper part of the base plate. The first surface of the base plate may face the discharge space. The guide pin may protrude from the second surface of the base plate formed on the opposite side of the first surface.

[0025] Inside the above case, a high-low pressure separator may be disposed on the opposite side of the compression section relative to the support member. The high-low pressure separator may divide the internal space of the case into a low-pressure section and a high-pressure section.

[0026] The scroll compressor according to the present invention, as examined above, has the following effects.

[0027] In the present invention, the first scroll (non-rotating scroll) constituting the compression unit can be supported in a state where it can move axially by a support member positioned at the top. In this way, the mounting position of the first scroll can be moved from the existing radial outer edge to the top of the first scroll. Accordingly, the part for coupling at the radial outer edge of the first scroll can be omitted, and the inner diameter of the compressor can be reduced, thereby achieving the effect of miniaturization.

[0028] In addition, if the inner diameter of the compressor is maintained constant, the compression section space increases, allowing more refrigerant to be compressed, thereby achieving the effect of increasing the compressor's capacity.

[0029] In addition, since the first scroll in the present invention is axially supported by a support member rather than the main frame, the diameter of the main frame can be reduced along with the diameter of the first scroll. By reducing the diameters of the main frame and the first scroll, which account for a large portion of the weight in the compressor, the compressor can be made lighter.

[0030] In addition, in the present invention, a guide sleeve and a guide pin corresponding to each other may protrude axially from the first scroll and the support member to form a connection. As such, in the present invention, additional parts such as guide bushes and bolts for supporting the axial movement of the first scroll are not required, thereby reducing the number of parts of the compressor and simplifying its structure.

[0031] In addition, in the present invention, during the process of stacking the first scroll and the support member, the first scroll can be coupled to the support member in a state where it can move axially. Since the coupling with the support member is naturally achieved during the process of mounting the first scroll in this way, the assemblability of the compressor can also be improved.

[0032] In particular, when the support member is composed of a high-low pressure separator, the number of parts and assembly steps for supporting the first scroll can be further reduced. In addition, since the present invention can be applied without additional parts, design changes to existing compressors can be minimized.

[0033] In addition, in the present invention, the guide sleeve of the first scroll and the guide pin of the support member act as a kind of bead, thereby reinforcing the rigidity of the part. Through this, the effect of improving the durability of the compressor can be obtained.

[0034] In addition, in the present invention, the connection portion between the first scroll and the support member may be formed inwardly from the radial edge of the first scroll. When the connection portion between the two parts is positioned close to the center of the compression portion, which is at a relatively high pressure, the support member can more stably support the axial movement of the first scroll.

[0035] FIG. 1 is a schematic side cross-sectional view of an embodiment of a scroll compressor according to the present invention.

[0036] FIG. 2 is a schematic enlarged view showing the upper part of FIG. 1.

[0037] FIG. 3 is an exploded perspective view showing the structure of a compression part and a support member constituting an embodiment of a scroll compressor according to the present invention.

[0038] FIG. 4 is a perspective view showing the first scroll and the second scroll disassembled after removing the back pressure assembly from FIG. 3.

[0039] FIG. 5 is a perspective view of FIG. 4 shown from a different angle.

[0040] FIG. 6 is a cross-sectional view showing the structure of a support member and a first scroll constituting an embodiment of a scroll compressor according to the invention.

[0041] FIG. 7 is a cross-sectional view showing the structure of a support member and a first scroll constituting an embodiment of a scroll compressor according to the invention in disassembly.

[0042] FIG. 8 is an exploded perspective view showing the structure of a support member and a first scroll constituting an embodiment of a scroll compressor according to the invention.

[0043] FIG. 9 is an enlarged cross-sectional view showing the connection portion between a support member and a first scroll constituting an embodiment of a scroll compressor according to the invention.

[0044] FIG. 10 is a cross-sectional view showing the structure of a support member and a first scroll constituting a second embodiment of a scroll compressor according to the present invention.

[0045] FIG. 11 is a cross-sectional view showing the internal structure of a third embodiment of a scroll compressor according to the present invention.

[0046] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0047] The present invention relates to a scroll compressor (1). The present invention includes structures for saving space for mounting by moving the mounting position of a first scroll (31) constituting a compression unit (3) to the upper part of the first scroll (31). Below, we will examine these structures in detail.

[0048] Referring to FIG. 1, the scroll compressor (1) according to the present invention is intended to compress a refrigerant and transmit the compressed refrigerant. For example, the scroll compressor (1) according to the present invention can be applied to a vapor compression type refrigeration cycle such as a refrigerator or an air conditioner. In this case, the scroll compressor (1) according to the present invention can perform the role of compressing the refrigerant and transmitting it to a condenser.

[0049] For reference, in the drawing, U represents the upper direction of the compressor (1) with respect to the axial direction, and D represents the lower direction of the compressor (1) with respect to the axial direction. Here, the axial direction refers to the direction in which the rotation center (250b), which will be described later, is extended. In the drawing, C represents the center direction of the compressor (1) with respect to the radial direction, and P represents the outer direction of the compressor (1) with respect to the radial direction. Here, the radial direction refers to the direction from the center of the compressor (1) toward the edge of the compressor (1) along a direction perpendicular to the axial direction.

[0050] Referring to FIGS. 1 and 2, a scroll compressor (1) according to the present invention may include a case (2), a compression unit (3), and a main frame (4). The case (2) may form the overall exterior of the scroll compressor (1) according to the present invention. The case (2) may be formed with an empty interior. The compression unit (3) may be disposed inside the case (2). The case (2) may be provided with an intake port (21) and a discharge port (22).

[0051] Refrigerant can be introduced into the interior of the case (2) through the intake port (21). Compressed refrigerant can be discharged from the interior of the case (2) through the discharge port (22). The discharge port (22) can be connected to a pipe that delivers refrigerant to the condenser of the refrigeration cycle. The discharge port (22) can be positioned at a higher height than the intake port (21).

[0052] The portion connected to the suction port (21) and the portion connected to the discharge port (22) within the case (2) can be partitioned by a support member (24). In this case, the portion connected to the suction port (21) within the case (2) can be implemented as a suction space (231). The portion connected to the discharge port (22) within the case (2) can be implemented as a discharge space (232). The support member (24) can separate the suction space (231), which is at a relatively low pressure, from the discharge space (232), which is at a relatively high pressure. The suction space (231) can be positioned below the support member (24), and the discharge space (232) can be positioned above the support member (24). The support member (24) can be coupled to the case (2) so as to be positioned inside the case (2).

[0053] The support member (24) can be connected to the first scroll (31), which will be described below. Here, connection means that the support member (24) is coupled to the first scroll (31), and that the first scroll (31) is coupled to the support member (24) in a state where it can move axially. The support member (24) can guide the first scroll (31) to move upward and downward with respect to the axial direction. Referring to FIG. 1, the support member (24) is provided with a guide pin (245), and the guide pin (245) is shown coupled to the guide sleeve (335) of the first scroll (31). In this state, the first scroll (31) can be pressed downward, that is, in the direction of the second scroll (36), by the back pressure assembly (35), and in this process, it can be in close contact with the second scroll (36). This structure will be explained again below.

[0054] An oil storage space (28) for storing oil may be disposed inside the case (2). The oil stored in the oil storage space (28) may be supplied to the compression unit (3), etc., to perform lubrication, and then recovered into the oil storage space (28). The oil storage space (28) may be disposed in the lower part of the case (2).

[0055] A driving unit (25) may be disposed inside the above case (2). The driving unit (25) may operate the compression unit (3). The driving unit (25) may generate rotational force and, by using the rotational force to rotate the driving shaft (250), cause the compression unit (3) to operate to compress the refrigerant. The driving shaft (250) may be coupled to the compression unit (3). Accordingly, the rotational force generated by the driving unit (25) may be transmitted to the compression unit (3) through the driving shaft (250). The driving unit (25) may be disposed on the lower side of the compression unit (3). Although not illustrated, the driving unit (25) may also be disposed on the upper side of the compression unit (3).

[0056] The above drive unit (25) may include a rotor (251) and a stator (252). The rotor (251) and the stator (252) may generate rotational force through electrical action. The rotor (251) may be coupled to the drive shaft (250). The stator (252) may include a stator core (252a) and a stator coil (252b). The stator core (252a) may be fixed to the case (2). The stator coil (252b) may be wound on the stator core (252a). The stator coil (252b) may be electrically connected to an external power source through a terminal device (not shown) coupled to the case (2). When power is applied to the stator coil (252b) from the above external power source, the rotor (251) rotates, thereby rotating the drive shaft (250).

[0057] The drive shaft (250) may be rotatably coupled to the case (2). In this case, the upper part of the drive shaft (250) may be coupled to the compression part (3), and the lower part of the drive shaft (250) may be rotatably coupled to the bottom of the case (2) through a bearing (250a). The bottom of the case (2) may support oil stored in the oil storage space (28). The oil stored in the oil storage space (28) may flow upward through an oil pipe (253) provided in the drive shaft (250) to perform lubrication in the drive part (25), the compression part (3), etc. The oil pipe (253) may be positioned inside the drive shaft (250).

[0058] The above compression unit (3) may be placed inside the case (2). The compression unit (3) may compress refrigerant. Refrigerant introduced into the suction space (231) through the suction port (21) may be supplied to the compression unit (3), compressed, and then discharged through the discharge space (232) via the discharge port (22). The compression unit (3) may be placed on the lower side of the support member (24). That is, the compression unit (3) may be placed in the suction space (231). The compression unit (3) may discharge the compressed refrigerant into the discharge space (232). The second scroll (36) constituting the compression unit (3) may be supported on the main frame (4).

[0059] Referring to FIGS. 3 to 5, the compression unit (3) may include a first scroll (31) and a second scroll (36). The first scroll (31) and the second scroll (36) may be arranged to be stacked vertically. By utilizing the relative rotation between the first scroll (31) and the second scroll (36), the compression unit (3) can compress the refrigerant and discharge the compressed refrigerant. In this case, either the first scroll (31) or the second scroll (36) may be implemented as a rotating scroll that performs a rotating motion, and the other may be implemented as a non-rotating scroll that does not rotate. In the following description, the second scroll (36) corresponds to a rotating scroll and the first scroll (31) corresponds to a non-rotating scroll; however, it will be obvious to those skilled in the art to which the present invention belongs that the second scroll (36) corresponds to a non-rotating scroll and the first scroll (31) corresponds to a rotating scroll can be derived from this.

[0060] The first scroll (31) may be placed inside the case (2). The first scroll (31) may be placed above the second scroll (36). The first scroll (31) and the second scroll (36) may interlock to form a compression chamber (331, 381) for compressing the refrigerant. The first scroll (31) may be connected to the suction space (231) and the discharge space (232), respectively. Accordingly, the refrigerant may be introduced into the compression chamber (331, 381) through the first scroll (31), compressed, and then discharged into the discharge space (232) through the first scroll (31).

[0061] An inlet (not shown) may be formed on the side wall of the first scroll (31) to allow the refrigerant present in the suction space (231) to flow in. A discharge port (315) may be formed on the upper part of the first scroll (31) to discharge the compressed refrigerant into the discharge space (232). The first scroll (31) may be supported by the support member (24). When the second scroll (36) rotates, the first scroll (31) may not rotate. The first scroll (31) may be coupled to the support member (24) so ​​that it can only move in the axial direction without rotating. In this embodiment, the first scroll (31) is not directly coupled to the main frame (4).

[0062] Referring to FIG. 5, the first scroll (31) may include a first plate section (310) and a first wrap (330). The first plate section (310) may be positioned above the second scroll (36). The first plate section (310) may be positioned above the second plate section (360). The first plate section (310) may be formed in the shape of a disc overall. The first plate section (310) may be positioned between the support member (24) and the first wrap (330).

[0063] The first end plate (310) may be coupled to the support member (24). The first end plate (310) is provided with a guide sleeve (335) to be described below, and the guide sleeve (335) may be coupled axially to a guide pin (245) of the support member (24). The guide sleeve (335) may be guided axially by the guide pin (245). The first end plate (310) may be coupled to the support member (24) so ​​as not to pivot. The discharge port (315) may be formed in the first end plate (310). The discharge port (315) may be formed by penetrating the first end plate (310).

[0064] The first wrap (330) may protrude from the first end plate (310) toward the second scroll (36). For example, the first wrap (330) may protrude from the first end plate (310) in a spiral shape. The first wrap (330) may be positioned to interlock with the second wrap (380). In this case, a first compression chamber (331) may be provided inside the first wrap (330). The first compression chamber (331) may be used as a space for compressing refrigerant. Reference numeral 333 indicates the end of the first wrap (330).

[0065] The second scroll (36) may be placed inside the case (2). The second scroll (36) may be placed below the first scroll (31). The second scroll (36) may be coupled to the drive shaft (250). Accordingly, the second scroll (36) may rotate by the rotational force transmitted through the drive shaft (250). In this case, the second scroll (36) may be coupled eccentrically from the rotation center (250b) of the drive shaft (250). Accordingly, when the drive shaft (250) rotates around the rotation center (250b), the second scroll (36) may rotate along a circumference with a radius of a distance from the rotation center (250b). That is, the second scroll (36) may revolve around the rotation center (250b).

[0066] For this eccentric structure, an eccentric member (250c) may be formed on the upper part of the drive shaft (250). The eccentric member (250c) may be formed in a cylindrical shape centered on the eccentric position. Compared to other parts of the drive shaft (250) located below the eccentric member (250c), the eccentric member (250c) may be formed to have a smaller diameter. The second scroll (36) is coupled to the eccentric member (250c) so that it can orbit around the center of rotation (250b) together with the eccentric member (250c) which orbits around the center of rotation (250b).

[0067] The above drive unit (25) may include a balance weight (254). The balance weight (254) can cause the drive shaft (250) to rotate stably around the rotation center (250b) by applying a load in a direction different from the direction in which the eccentric member (250c) is eccentric. For example, the balance weight (254) may apply a load by protruding in a direction opposite to the direction in which the eccentric member (250c) is eccentric. The balance weight (254) may be coupled to the drive shaft (250). Although not illustrated, the balance weight (254) may be coupled to other structures, such as the rotor (251), so that the stability of the rotation of the drive shaft (250) can be improved by applying a load in a direction different from the direction in which the eccentric member (250c) is eccentric.

[0068] Meanwhile, the second scroll (36) can rotate in a state where rotation is blocked by the anti-rotation member (255). The anti-rotation member (255) can block the rotation of the second scroll (36) by using a locking mechanism, etc. For example, the rotation of the second scroll (36) can be blocked by inserting the key protrusion of the anti-rotation member (255) into the key groove (362, see FIG. 4) of the second scroll (36). The anti-rotation member (255) can be coupled to the main frame (4).

[0069] As the second scroll (36) rotates, the volumes of the first compression chamber (331) and the second compression chamber (381) change, thereby enabling the suction, compression, and discharge of the refrigerant. This process can be carried out with the lower end of the first wrap (330) in contact with the upper surface of the second end plate (360) and the upper end of the second wrap (380) in contact with the lower surface of the first end plate (310). Contact between the first wrap (330) and the second end plate (360), and contact between the second wrap (380) and the first end plate (310), can be achieved by the lowering of the first scroll (31).

[0070] Referring to FIG. 4, the second scroll (36) may include a second end plate (360), a second wrap (380), and a drive shaft connecting part (370). The second end plate (360) may be positioned below the first scroll (31). The second end plate (360) may be formed in the shape of a disc overall. The second end plate (360) may be positioned between the second wrap (380) and the drive shaft connecting part (370). The second scroll (36) may be supported on the main frame (4). The second scroll (36) may be supported on the main frame (4) so ​​as to be pivotable and capable of moving up and down. The second scroll (36) may also be supported on the main frame (4) so ​​as not to be pivotable and capable of moving up and down. Drawing reference numeral 372 indicates a shaft coupling groove for coupling with the drive shaft (250).

[0071] The second wrap (380) may protrude from the second end plate (360) toward the first scroll (31). For example, the second wrap (380) may protrude from the second end plate (360) in a spiral shape. A second compression chamber (381) may be provided inside the second wrap (380). The second compression chamber (381) may be used as a space for compressing refrigerant. Reference numeral 383 indicates the end of the second wrap (380).

[0072] The drive shaft connecting part (370) can be connected to the second end plate part (360). When the second wrap (380) protrudes upward from the upper surface of the second end plate part (360), the drive shaft connecting part (370) can protrude downward from the lower surface of the second end plate part (360). The drive shaft connecting part (370) can be coupled to the drive shaft (250). In this case, the drive shaft (250) can be coupled to the drive shaft connecting part (370) by inserting the eccentric member (250c) into the inner side of the drive shaft connecting part (370). Through the drive shaft connecting part (370), the second scroll (36) can rotate using the rotational force transmitted from the drive shaft (250).

[0073] Referring to FIGS. 1 and 3, a back pressure assembly (35) may be disposed in the center of the support member (24). Due to the back pressure of a back pressure chamber (not shown) formed inside the back pressure assembly (35), the first scroll (31) may be pressed in a direction toward the second scroll (36), thereby sealing the compression chambers (331, 381). Here, back pressure refers to the force acting on the back pressure chamber. The first scroll (31) may be guided by the support member (24) and move relative to the second scroll (36) in the axial direction.

[0074] The back pressure assembly (35) may be provided with a back pressure plate (350). A plurality of intermediate discharge ports (355) may be opened in the back pressure plate (350). The intermediate discharge ports (355) are opened toward the discharge space (232) so as to discharge the refrigerant compressed in the compression unit (3) into the discharge space (232).

[0075] A discharge valve (not shown) may be slidably coupled to the back pressure plate (350) inside the back pressure plate (350). The discharge valve may be raised and lowered inside the back pressure plate (350). The refrigerant compressed in the compression section (3) moves to the discharge port (315) and pressurizes the discharge valve in the opening direction (upward relative to the drawing). Then, the discharge valve is pushed by the pressure in the discharge pocket and rises along the inside of the back pressure plate (350), opening the discharge port (315). Then, the refrigerant in the discharge pocket is discharged into the discharge space (232) through the discharge port (315) and the intermediate discharge port (355). As another example, the back pressure assembly (35) may be omitted, and a gasket of a simple structure may be placed on the upper part of the first scroll (31).

[0076] Looking at FIG. 4 with the back pressure assembly (35) removed, a discharge port (315) formed at the center of the first scroll (31) can be exposed. The discharge port (315) is connected to the compression chambers (331, 381) and serves as an outlet for the discharge of compressed refrigerant. More precisely, the refrigerant in the discharge pocket located at the center of the compression chambers (331, 381) is discharged through the discharge port (315). The discharge port (315) can be opened and closed by the discharge valve described above. Reference numeral 320 indicates a bypass hole.

[0077] Referring to FIGS. 5 to 8, a guide unit (MG), which is a combined structure of the support member (24) and the first scroll (31), will be described. Through the guide unit (MG), the support member (24) and the first end plate (310) are connected to each other in the axial direction, so that the support member (24) can support the axial movement of the first scroll (31). The support member (24) supports the axial movement of the first scroll (31), thereby allowing the first scroll (31) to move in the direction of the second scroll (36) or in the opposite direction by the back pressure of the back pressure assembly (35). That is, the support member (24) does not fix the first scroll (31) but allows the first scroll (31) to move in the axial direction.

[0078] The guide unit (MG) may be composed of a guide pin (245) of the support member (24) and a guide sleeve (335) of the first scroll (31). The guide pin (245) and the guide sleeve (335) may be combined with each other during the stacking process of the support member (24) and the first scroll (31). The guide pin (245) and the guide sleeve (335) are connected in a state where they can move axially relative to each other without maintaining a fixed state.

[0079] The support member (24) may be provided with a guide pin (245). The guide pin (245) protrudes axially from the support member (24). The guide pin (245) may be approximately cylindrical or columnar in shape. The guide pin (245) may be inserted axially into the guide sleeve (335) of the first scroll (31). As the first scroll (31) moves up and down axially, the depth to which the guide pin (245) is inserted axially into the guide sleeve (335) changes.

[0080] In this embodiment, the support member (24) functions as a high-low pressure separator. That is, a high-pressure section is formed at the top relative to the support member (24), and a low-pressure section is formed at the bottom. To this end, the support member (24) may be positioned between the suction port (21) and the discharge port (22) with respect to the axial direction. The upper part closer to the discharge port (22) relative to the support member (24) becomes the high-pressure section, and the high-pressure section can be viewed as the discharge space (232). The low-pressure section may include the suction space (231) in which the compression section (3) and the driving section (25) are formed.

[0081] Looking at the specific structure of the support member (24), the support member (24) may include a base plate (241) having a plate-like structure. A discharge connection hole (244) for passing the refrigerant discharged from the compression chamber may be formed at the center of the base plate (241). The base plate (241) is formed in a roughly circular shape and may be spaced apart from the inner circumference of the case (2) or be in close contact with the inner circumference.

[0082] A side plate (242) may be provided along the edge of the base plate (241). The side plate (242) extends axially from the edge of the base plate (241) to form the side of the support member (24). An end (243) of the side plate (242) may be fixed to the case (2). The end (243) of the side plate (242) is fixed to the case (2) by means such as welding. Referring to FIG. 2, the end (243) of the side plate (242) may be fixed between the case (2) and a cover (2') that covers the top of the case (2).

[0083] The guide pin (245) may protrude axially from the base plate (241). The guide pin (245) protrudes downward toward the first end plate (310) from the bottom surface of the base plate (241). The guide pin (245) may be placed in a space enclosed by the side plate (242).

[0084] A discharge space (232) connected to the discharge port (22) is formed on the upper part of the base plate (241), and the first surface of the base plate (241) may face the discharge space (232). At this time, the guide pin (245) protrudes from the second surface of the base plate (241) formed on the opposite side of the first surface. Accordingly, the guide pin (245) may be placed on the opposite side of the discharge space (232), more precisely in the space (247) surrounded by the side plate (242).

[0085] The guide pin (245) may include a plurality of guide pins (245) arranged at equal intervals along the edge of the support member (24). By supporting the first scroll (31) at a plurality of points, the plurality of guide pins (245) can guide the first scroll (31) to move axially in a balanced manner without twisting with respect to the axial direction. In this embodiment, a total of three guide pins (245) are arranged on the support member (24). As another example, two guide pins (245) or four or more guide pins (245) may be provided on the support member (24). Additionally, the guide pins (245) may not be arranged at equal intervals but may be arranged at different intervals.

[0086] The plurality of guide pins (245) may be arranged around the discharge connection hole (244). The plurality of guide pins (245) are arranged so as not to interfere with the discharge connection hole (244). By arranging the plurality of guide pins (245) around the discharge connection hole (244), the rigidity of the support member (24) can be increased and deformation resistance improved due to the discharge connection hole (244).

[0087] Referring to FIG. 4, the first scroll (31) is provided with a guide sleeve (335). The guide sleeve (335) protrudes axially from the first end plate (310). A guide hole (336) into which the guide pin (245) is inserted axially may be opened in the guide sleeve (335). The entrance of the guide sleeve (335) is open axially, and the guide pin (245) may move axially along the guide sleeve (335).

[0088] Specifically, as shown in FIG. 7, the first wrap (330) may protrude along the axial direction from the first surface (311) of the first end plate (310). The guide sleeve (335) may protrude in the opposite direction to the first wrap (330) along the axial direction from the second surface (312) of the first end plate (310). Consequently, the first wrap (330) and the guide sleeve (335) may have a structure in which they protrude in opposite directions.

[0089] The first scroll (31) may be provided with a plurality of guide sleeves (335). At this time, as shown in FIG. 3, the plurality of guide sleeves (335) may be arranged around the back pressure assembly (35). In this way, the plurality of guide sleeves (335) may be arranged to avoid interference with the back pressure assembly (35). The plurality of guide sleeves (335) may be arranged in the remaining area of ​​the upper surface of the first scroll (31) where the back pressure assembly (35) is not placed, that is, in an unused area.

[0090] The guide sleeves (335) are provided to correspond to the number and position of the guide pins (245). In the first scroll (31), a plurality of guide sleeves (335) corresponding to the guide pins (245) are arranged at equal intervals along the edge of the first plate section (310). In this embodiment, a total of three guide sleeves (335) are arranged in the first scroll (31). As another example, two guide sleeves (335) or four or more guide sleeves (335) may be provided in the first scroll (31). Additionally, the guide sleeves (335) may not be arranged at equal intervals along the edge of the first plate section (310), but may be arranged at different intervals.

[0091] When the guide pin (245) is inserted into the guide sleeve (335), the first scroll (31) can be guided by the guide pin (245) and moved up and down in the axial direction. That is, the first scroll (31) is coupled to the support member (24) rather than the main frame (4). In this way, there is no need to place a structure at the radial edge of the first scroll (31) to fix the first scroll (31) so that it can move axially. Here, the radial edge of the first scroll (31) refers to a part that protrudes further outward than the radial edge (334) of the first wrap (330). As the part for fixing the first scroll (31) is omitted at the edge of the first scroll (31) in this way, the diameter of the main frame (4) and the first scroll (31) can be relatively smaller.

[0092] Referring to FIG. 2, the joint portion (MF) of the existing main frame (4), which was required to fix the edge of the first scroll (31) in the axial direction, is shown as a dotted line. As this joint portion (MF) is omitted, the diameter of the main frame (4) can be reduced, and the diameter of the first scroll (31) can also be reduced. In FIG. 2, this difference is represented by D, and the space where the joint portion (MF) is formed is indicated by FA. Of course, this difference is formed around the entire compressor. As a result, the compressor (1) can be miniaturized by this difference (D, FA). If the size of the compressor (1) is maintained the same, the volume of the compression chamber (331, 381) can be further increased.

[0093] A low-pressure space (247) connected to the suction port (21) is defined at the lower part of the support member (24). At this time, a connecting part (K) connecting the support member (24) and the first scroll (31) can be placed in the refrigerant suction space, which is the low-pressure space (247). Referring to FIG. 6, in this embodiment, the connecting part (K) is placed in a partitioned space (247) surrounded by the support member (24) and the first scroll (31). The connecting part (K) is placed inside the partitioned space (247) at a location outside the discharge path of the compressed refrigerant. For reference, the connecting part (K) refers to the point where the guide pin (245) and the guide sleeve (335) are joined together.

[0094] Based on the first end plate (310), the connection part (K) between the support member (24) and the first scroll (31) and the first wrap (330) can be positioned on opposite sides in the axial direction. Referring to FIG. 6, a virtual reference line extending the first end plate (310) in the radial direction is indicated as RL. Based on the reference line, the connection part (K) is positioned upward (direction of arrow ①), and the first wrap (330) is positioned downward (direction of arrow ②). As such, when viewed with respect to the first end plate (310), the connection part (K) and the first wrap (330) are positioned on opposite sides along the axial direction, so the connection part (K) can be positioned in an empty space without interfering with the compression chamber (331, 381). In addition, the first end plate (310) is provided with a guide sleeve (335) and a first wrap (330) protruding in both directions, respectively, so that the rigidity of the first scroll (31) including the first end plate (310) can be reinforced.

[0095] Referring to FIG. 9, the axial position of the connecting part (K) is indicated as L1. The axial position of the connecting part (K) can be formed higher than half the axial height between the second surface of the first end plate (310) and the base plate (241). In this way, the total coupling height of the first scroll (31) and the support member (24) is increased, so that the axial movement of the first scroll (31) can be supported more stably.

[0096] Meanwhile, as shown in FIG. 9, the guide pin (245) and the guide sleeve (335) can be joined together radially inward from the radial edge (334) of the first wrap (330). The connecting portion (K) where the guide pin (245) and the guide sleeve (335) are joined is positioned closer to the center than the radial edge (334) of the first wrap (330). Here, the radial edge (334) of the first wrap (330) can form a surface facing the inner circumference of the case (2). More specifically, in FIG. 9, a virtual extension line extending along the axial direction of the radial edge (334) of the first wrap (330) is indicated as M1, and a virtual extension line extending along the axial direction of the center of the connecting portion (K) is indicated as M2. At this time, M1 is formed radially outward from M2.

[0097] Thus, if the connecting part (K) is positioned closer to the center than to the edge (334) of the first wrap (330) based on the radial direction, the diameter of the first scroll (31) can be made smaller. In addition, as the connecting part (K) approaches the center of the compression part (3), the guide pin (245) can stably support the first scroll (31) in an area closer to the center of the compression part (3), which is a relatively high-pressure area.

[0098] FIG. 10 illustrates a support member (24) and a first scroll (31) constituting a second embodiment of the present invention. As shown in FIG. 10, a guide sleeve (245) may be provided on the support member (24), and a guide pin (335) may be provided on the first scroll (31). That is, the guide sleeve (245) of the support member (24) may be structured to surround the guide pin (335) of the first scroll (31). Although not illustrated, the support member (24) may be provided with both the guide sleeve (335) and the guide pin (245), and conversely, the first scroll (31) may be provided with both the guide pin (245) and the guide sleeve (335).

[0099] FIG. 11 illustrates a support member (24), a first scroll (31), and a high-low pressure separator (29) constituting a third embodiment of the present invention. For reference, the base plate (291), side plate (292), discharge connection hole (294), and inner space (297) constituting the high-low pressure separator (29) of this embodiment correspond to the structure of the preceding embodiment. In this embodiment, the high-low pressure separator (29) may be placed inside the case (2) on the opposite side of the compression section (3) with respect to the support member (24). Here, the high-low pressure separator (29) may divide the internal space of the case (2) into a low-pressure section and a high-pressure section. The support member (24) may be composed of a separate material from the high-low pressure separator (29) and may serve to support the first scroll (31) in the axial direction. The high-low pressure separator (29) is provided with a guide pin (295), and the first scroll (31) may be provided with a guide sleeve (335) that accommodates the guide pin (295).

[0100] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A case provided with an intake port for sucking in refrigerant and a discharge port for discharging compressed refrigerant; A drive unit that rotates a drive shaft; A main frame fixed in the internal space of the above case; and It includes a compression section having a compression chamber formed therein for compressing the refrigerant. The above compression part A first scroll including a first plate section and a first wrap, and It is driven by the above-mentioned drive shaft and includes a second scroll that is engaged with the first scroll to define the compression chamber and includes a second end plate and a second wrap, and A scroll compressor in which a support member guiding the axial movement of the first scroll contacts the first end plate in the axial direction.

2. A scroll compressor according to claim 1, wherein the support member and the first end plate portion are provided with a guide pin and a guide sleeve connected to each other in an axial direction.

3. The scroll compressor of claim 2, wherein the guide pin and the guide sleeve are joined to each other radially inward from the radial edge of the first wrap.

4. In claim 1, the support member is disposed between the suction port and the discharge port with respect to the axial direction, and A scroll compressor in which the support member and the first end plate are axially connected to each other.

5. In claim 1, the support member and the first end plate portion are provided with a guide pin and a guide sleeve connected to each other in an axial direction, and A scroll compressor in which the guide pin and the guide sleeve are connected to each other at a position spaced apart from the first end plate section based on the axial direction.

6. In claim 1, a back pressure assembly is disposed in the internal space of the case to provide back pressure to the first scroll in contact with the first scroll, and The support member and the first end plate are provided with a guide pin and a guide sleeve connected to each other in the axial direction. A scroll compressor in which the guide pin and the guide sleeve are connected to each other based on the radial direction between the edge of the first wrap and the back pressure assembly.

7. In claim 1, the support member is provided with a guide pin protruding in the axial direction, and A scroll compressor having a guide sleeve that protrudes axially from the first end plate and into which the guide pin is inserted axially.

8. A scroll compressor according to claim 7, wherein the inlet of the guide sleeve is axially open and the guide pin moves axially along the guide sleeve.

9. In claim 7, the guide pin comprises a plurality of guide pins arranged at equal intervals along the edge of the support member, and The above guide sleeve is a scroll compressor comprising a plurality of guide sleeves arranged at equal intervals along the edge of the first end plate section.

10. In claim 1, the support member is provided with a guide sleeve protruding in the axial direction, and A scroll compressor having a guide pin that protrudes axially from the first end plate and is inserted axially into the guide sleeve.

11. In claim 1, a discharge space connected to the discharge port is defined on the upper part of the support member, and A low-pressure space connected to the suction port is defined in the lower part of the support member, and A scroll compressor in which the support member and the first scroll are connected to each other and disposed in the low-pressure space.

12. A scroll compressor according to claim 1, wherein, based on the first end plate portion, the connecting portion between the support member and the first scroll and the first wrap are arranged on axially opposite sides.

13. In claim 1, a discharge connection hole connected to a discharge space is formed in the center of the support member, and A scroll compressor in which a plurality of guide pins connected to the guide sleeves of the first scroll are arranged around the discharge connection hole.

14. In claim 1, a back pressure assembly for providing back pressure to the first scroll is disposed on the upper portion of the first scroll, and A plurality of guide sleeves connected to the guide pins of the support member are arranged around the back pressure assembly.

15. The scroll compressor of claim 1, wherein the support member is disposed between the main frame and the discharge port with respect to the axial direction.

16. A scroll compressor according to claim 1, wherein the internal space of the case is divided into a low-pressure section and a high-pressure section by the support member.

17. In claim 1, the first scroll is The above first plate section; The first wrap protruding along the axial direction from the first surface of the first plate portion; and A guide sleeve protruding in the opposite direction to the first wrap along the axial direction from the second surface of the first plate portion; The above guide sleeve is a scroll compressor connected to the guide pin of the above support member.

18. In claim 1, the support member A base plate having a discharge connection hole formed therein for passing the refrigerant discharged from the above compression chamber; A side plate provided along the edge of the base plate and extending axially from the edge of the base plate; and A scroll compressor comprising: a guide pin that protrudes axially from the base plate and is disposed in the space enclosed by the side plate.

19. In claim 18, a discharge space connected to the discharge port is formed on the upper part of the base plate, and The first surface of the base plate faces the discharge space, and The above guide pin is a scroll compressor protruding from the second surface of the base plate formed on the opposite side of the first surface.

20. In claim 1, a high-low pressure separator is disposed inside the case on the opposite side of the compression part with respect to the support member, and The above high-low pressure separator is a scroll compressor that divides the internal space of the case into a low-pressure section and a high-pressure section.

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