Scroll compressor

Abstract

The application provides a scroll compressor, which comprises a shell, a scroll mechanism and a heat shield, the shell is provided with a suction port fitting, the suction port fitting has a suction port at the shell, the scroll mechanism comprises a fixed scroll with an outer peripheral wall and a movable scroll with a movable scroll end plate, the fixed scroll and the movable scroll are mutually engaged to form a series of compression cavities for compressing working fluid between each other, an air inlet for allowing working fluid to enter the compression cavity is formed at the outer peripheral wall of the fixed scroll, the air inlet comprises a bottom end surface close to the movable scroll end plate in the axial direction and an opposite top end surface, the heat shield is installed at a position in circumferential alignment with the air inlet, wherein the heat shield comprises a first end surface close to the movable scroll end plate in the axial direction, and the first end surface is farther away from the movable scroll end plate than the bottom end surface of the air inlet. According to the scroll compressor of the application, not only can the overheating of the suction air be effectively avoided, but also the structure is simple, easy to manufacture and low in cost.

Description

Technical Field

[0001] This invention relates to a scroll compressor, and more particularly, to a scroll compressor equipped with a heat shield. Background Technology

[0002] A scroll compressor typically includes a housing, a motor housed within the housing, and a scroll mechanism driven by the motor. The internal space surrounded by the housing is usually divided into a high-pressure zone and a low-pressure zone by a silencer cover. The motor and scroll mechanism can be located in the low-pressure zone. The working fluid enters the low-pressure zone through the intake port on the housing, then enters the scroll mechanism, where it is compressed into a high-pressure, high-temperature working fluid before being discharged to the high-pressure zone. Finally, it is discharged outside the compressor through the exhaust port on the housing.

[0003] In existing technology, the main reason for suction overheating in scroll compressors is that the suction temperature is affected by the motor's heat generation and the high temperature in the high-pressure zone. Especially when the suction port accessories are close to the muffler cover, the suction temperature is less affected by the motor's heat generation, but significantly affected by the high temperature in the high-pressure zone.

[0004] Therefore, it is necessary to reduce the impact of high temperature in the high-pressure zone on the suction temperature, thereby improving the suction overheating problem of the scroll compressor and enhancing compressor performance. Summary of the Invention

[0005] This section provides a general overview of the invention, rather than a full disclosure of the invention's complete scope or all its features.

[0006] One objective of this invention is to provide a heat shield for a scroll compressor, which can reduce the impact of high temperature in the high-pressure zone on the suction temperature, thereby improving the problem of overheating in the suction of the scroll compressor and enhancing its performance.

[0007] Another object of the present invention is to provide a scroll compressor with a heat shield. The suction port of this scroll compressor is positioned approximately aligned with the inlet of its scroll mechanism, thus being away from the motor to reduce the impact of motor heat on the suction temperature. The heat shield further reduces the impact of high-pressure side temperature on the suction temperature. Furthermore, this scroll compressor eliminates the need for a flow guide device from the suction port to the inlet of the scroll mechanism, thereby avoiding the flow resistance and pressure loss caused by the flow guide device, and also avoiding the problem of the flow guide device directing all the working fluid into the scroll mechanism, resulting in insufficient motor cooling. Therefore, this scroll compressor not only has excellent performance but is also simple to manufacture, easy to install, and inexpensive.

[0008] According to one aspect of the present invention, a scroll compressor is provided, the scroll compressor comprising a housing, a scroll mechanism, and a heat shield. The housing is provided with an intake port fitting having an intake port located at the housing. The scroll mechanism includes a fixed scroll having an outer peripheral wall and a movable scroll having a movable scroll end plate. The fixed scroll and the movable scroll mesh with each other to form a series of compression chambers for compressing a working fluid. An intake port for allowing the working fluid to enter the compression chamber is formed on the outer peripheral wall of the fixed scroll. The intake port includes a bottom end face axially close to the movable scroll end plate and an opposite top end face. The heat shield is mounted at a position circumferentially aligned with the intake port, wherein the heat shield includes a first end face axially close to the movable scroll end plate, and the first end face is further away from the movable scroll end plate than the bottom end face of the intake port.

[0009] Optionally, the heat shield includes a first wall portion extending generally radially and a second and third wall portions extending generally axially, the second and third wall portions being disposed on circumferential sides of the first wall portion and extending downward from the first wall portion so as to be opposite each other, such that the heat shield defines a generally rectangular flow cross-section, and the first end face is formed by the lower surfaces of the second and third wall portions; or the heat shield includes an arc-shaped first, second, and third wall portions, such that the heat shield opens downward and defines a generally semi-circular flow cross-section, and the first end face is formed by the lower surfaces of the second and third wall portions.

[0010] Optionally, the heat shield has an outer opening formed by the radially outer portions of the first wall portion, the second wall portion, and the third wall portion, and an inner opening formed by the radially inner portions of the first wall portion, the second wall portion, and the third wall portion, wherein the circumferential dimension of the outer opening is larger than the diameter of the air intake port, and the circumferential dimension of the inner opening is larger than the circumferential dimension of the air inlet.

[0011] Optionally, the circumferential dimension of the outer opening is larger than that of the inner opening, and / or the heat shield is configured such that the flow cross-section of the heat shield gradually decreases along the direction from the outer opening toward the inner opening.

[0012] Optionally, the heat shield includes a first wall portion extending generally in a radial direction and an inner vertical wall portion extending generally axially upward from the radially inner side of the first wall portion, the first end face being formed by the lower surface of the first wall portion.

[0013] Optionally, the heat shield also includes a first side vertical wall portion and a second side vertical wall portion that extend generally axially upward from both sides of the first wall portion, such that the heat shield defines an upwardly open heat shield cavity.

[0014] Optionally, the lower surface of the first wall is further away from the moving vortex end plate than the top surface of the air inlet, and / or the lower surface of the first wall is further away from the moving vortex end plate than the top surface of the air intake port.

[0015] Optionally, the radially outer portion of the heat shield is fitted against the inner wall of the housing.

[0016] Optionally, the radially inner portion of the heat shield is fitted to the outer peripheral wall of the fixed vortex.

[0017] Alternatively, the heat shield is constructed without an inner vertical wall portion, thus being completely open radially inward.

[0018] Optionally, the intake port is aligned with the air inlet.

[0019] Optionally, the scroll compressor also includes a muffler cover, and the heat shield also includes a mounting part, the heat shield being fixed to the muffler cover or the fixed scroll via the mounting part.

[0020] Optionally, the heat shield is constructed of sheet metal.

[0021] Overall, the heat shield and scroll compressor equipped with the heat shield according to the present invention bring at least one of the following beneficial effects: since the suction port accessory is arranged close to the air inlet of the scroll mechanism, the suction port accessory is far away from the motor, reducing the impact of motor heating on the suction temperature; since the heat shield is provided, the impact of high temperature in the high-pressure zone on the suction temperature is reduced, thus significantly improving the suction overheating problem of the scroll compressor and improving the performance of the compressor; the heat shield has a simple structure, does not generate flow resistance to the working fluid, and is easy to manufacture and install with extremely low cost; the heat shield can also allow a portion of the working fluid to be used to cool the motor, effectively preventing the motor temperature from becoming too high. Attached Figure Description

[0022] The features and advantages of one or more embodiments of the present invention will become more readily apparent from the following description with reference to the accompanying drawings. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show details of specific parts. In the drawings:

[0023] Figure 1 This is a partial longitudinal sectional view of a scroll compressor according to a first embodiment of the present invention;

[0024] Figure 2 This is a top view of the vortex mechanism and heat shield according to the first embodiment of the present invention;

[0025] Figure 3 This is a side view of the vortex mechanism and heat shield according to the first embodiment of the present invention;

[0026] Figure 4 This is a three-dimensional schematic diagram of a heat insulation cover according to a first embodiment of the present invention;

[0027] Figure 5 This is a partial longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention;

[0028] Figure 6 This is a three-dimensional schematic diagram of a heat insulation cover according to a second embodiment of the present invention;

[0029] Figure 7 This is a top view of a heat shield according to a second embodiment of the present invention;

[0030] Figure 8 This is a perspective view of a heat insulation cover according to a third embodiment of the present invention;

[0031] Figure 9 This is a partial longitudinal sectional view of a scroll compressor according to a fourth embodiment of the present invention;

[0032] Figure 10 This is a perspective view of a heat shield according to a fourth embodiment of the present invention; and

[0033] Figure 11 This is a partial longitudinal sectional view of a scroll compressor based on a comparative example. Detailed Implementation

[0034] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. These descriptions are merely exemplary and do not constitute a limitation on the invention or its applications. In particular, although the scroll compressor is shown as a vertical scroll compressor in the preferred embodiments, the heat shield is also applicable to horizontal scroll compressors.

[0035] See Figure 1 According to a first embodiment of the present invention, the scroll compressor 100 mainly includes a housing 10, a scroll mechanism 20, and a motor for driving the scroll mechanism 20. Typically, the housing 10 includes a generally cylindrical housing body 12, an upper end cover 11, and a lower end cover (not shown). A silencer cover 13 is also provided between the housing body 12 and the upper end cover 11, thereby dividing the internal space of the compressor into a low-pressure zone LP and a high-pressure zone HP. The high-pressure zone HP is located between the upper end cover 11 and the silencer cover 13, while the low-pressure zone LP is located between the silencer cover 13 and the lower end cover. The scroll mechanism 20 and the motor are located within the low-pressure zone LP.

[0036] The scroll mechanism 20 includes a fixed scroll 21 and a moving scroll 22. The fixed scroll 21 includes a fixed scroll end plate 211 and a helical scroll extending downward from one side of the fixed scroll end plate 211. The moving scroll 22 includes a moving scroll end plate 221 and a helical scroll extending upward from one side of the moving scroll end plate 221. The scrolls of the fixed scroll 21 and the scrolls of the moving scroll 22 mesh with each other, thereby forming a series of compression chambers C between them for compressing a working fluid, such as a refrigerant. The fixed scroll 21 also includes a generally cylindrical outer peripheral wall 213 extending downward from the fixed scroll end plate 211 and disposed on the outer periphery of the scroll of the fixed scroll 21. An inlet 23 is formed on the outer peripheral wall 213 of the fixed scroll 21 for the working fluid to enter the compression chambers C. The housing body 12 is provided with an air intake fitting 14, and the upper end cover 11 is provided with an exhaust fitting 15. The working fluid enters the low-pressure zone LP through the air intake port 141 located at the housing body 12 of the air intake fitting 14, and then enters the compression chamber C through the air inlet 23 of the fixed scroll 21. After being compressed in the compression chamber C, it is discharged to the high-pressure zone HP, and then discharged to the outside of the scroll compressor 100 through the exhaust fitting 15.

[0037] Specifically, the intake port 141 of the intake port accessory 14 is positioned aligned with the intake port 23 of the fixed scroll 21. This allows the working fluid drawn in from the intake port 141 to enter the intake port 23 of the fixed scroll 21 with the shortest possible flow path, reducing flow resistance and thus reducing pressure loss. Furthermore, since the intake port 141 is relatively far from the motor, the working fluid entering the intake port 23 of the fixed scroll 21 is less affected by the motor's heat generation, thereby improving the performance degradation of the scroll compressor caused by overheating during intake.

[0038] To better prevent intake overheating, the scroll compressor 100 also includes a heat shield 130 to prevent heat from the high-pressure zone HP from being transferred toward the working fluid entering the intake port 23. See also Figure 4 The heat shield 130 is formed by interconnecting a first wall portion 134 extending generally radially and a second wall portion 135 and a third wall portion 136 extending generally axially. The second wall portion 135 and the third wall portion 136 are respectively disposed on both sides of the first wall portion 134 in the circumferential direction and extend downward from the first wall portion 134 to be positioned opposite each other. That is, the heat shield 130 is constructed in a generally annular (e.g., square ring) shape with three open sides, thereby defining a generally rectangular flow cross-section. The heat shield 130 includes an outer opening S1 formed by the radially outer portions 138 of the first wall portion 134, the second wall portion 135, and the third wall portion 136, and an inner opening S2 formed by the radially inner portions 137 of the first wall portion 134, the second wall portion 135, and the third wall portion 136 (see [link to relevant documentation]). Figure 2The heat shield 130 has a downward-opening bottom opening. That is, the heat shield 130 does not have an inner vertical wall portion, thus being completely open radially inward. The heat shield 130 also includes a mounting portion 133, which is configured as a double lug protruding circumferentially outward from near the radially inward portions 137 of the second wall portion 135 and the third wall portion 136, respectively. The mounting portion 133 can be positioned close to the first wall portion 134 to facilitate the installation and positioning of the heat shield 130. The heat shield 130 is fixedly mounted to the outer peripheral wall 213 of the fixed vortex 21 via the mounting portion 133, for example, by bolting or welding the mounting portion 133 to the outer surface of the outer peripheral wall 213 of the fixed vortex 21.

[0039] The following will refer to Figure 1 , Figure 2 and Figure 3 The specific installation position of the heat shield 130 in the scroll compressor is described. In the scroll compressor 100, the heat shield 130 is installed at a position circumferentially aligned with the air inlet 23 of the stationary scroll 21, and is configured to substantially surround the air inlet 23 of the stationary scroll 21. The air inlet 23 includes a bottom end face 24 of the moving scroll end plate 221, which is axially closer to the moving scroll 22, and a top end face 25, which is axially closer to the muffler cover 13 and opposite to the bottom end face 24. The heat shield 130 includes a first end face 131 of the heat shield 130, which is axially closer to the end plate 221, and a second end face 132 of the heat shield 130, which is axially closer to the muffler cover 13 and opposite to the first end face. The first end face includes a first end face 131 of the heat shield 130, which is formed by the lower surfaces of the second wall portion 135 and the third wall portion 136, while the second end face includes a second end face 132 of the heat shield 130, which is formed by the lower surface of the first wall portion 134. The first end face 131 of the heat shield 130 is higher than the bottom end face 24 of the air inlet 23, meaning the first end face 131 of the heat shield 130 is further away from the end plate 221 of the moving vortex 22 than the bottom end face 24 of the air inlet 23. The second end face 132 of the heat shield 130 is higher than the top end face 25 of the air inlet 23 (and also higher than the top end face of the intake port 141), meaning the second end face 132 of the heat shield 130 is further away from the end plate 221 of the moving vortex 22 than the top end face 25 of the air inlet 23. Therefore, the heat shield 130 can effectively block the transfer of heat from the high-pressure area to the working fluid at the air inlet 23, and it does not obstruct the flow of the working fluid towards the air inlet 23. In addition, due to the bottom opening of the heat shield 130, the working fluid entering the low-pressure zone LP from the intake port 141 will not be completely drawn into the intake port 23 of the fixed vortex 21. At least a portion of the working fluid can fully cool the motor in the low-pressure zone LP to prevent the motor temperature from becoming too high.

[0040] Preferably, see Figure 2 and Figure 3The circumferential dimension (width in the circumferential direction) L1 of the outer opening S1 of the heat shield 130 is greater than the circumferential dimension L2 of the inner opening S2 of the heat shield 130. That is, the heat shield 130 gradually narrows from the radially outer side to the radially inner side, and its flow cross-section gradually decreases from the radially outer side to the radially inner side, thereby effectively preventing turbulence. Furthermore, the circumferential dimension L1 of the outer opening 130 of the heat shield 130 is greater than the diameter D of the suction port 141, and the circumferential dimension L2 of the inner opening S2 of the heat shield 130 is greater than the circumferential dimension of the inlet 23 of the fixed scroll compressor 21, to further prevent turbulence. Additionally, since a portion of high-temperature lubricating oil accumulates at the bottom of the high-pressure zone HP (the lowest part of the upper surface of the muffler cover 13) during the operation of the scroll compressor, in order to block the heat transfer of this high-temperature lubricating oil to the heat shield 130 as much as possible, preferably, the second end of the heat shield 130 is axially lower than the oil storage area at the bottom of the high-pressure zone HP.

[0041] The radially outer portion 138 of the heat shield 130 may have a gap with the inner wall of the housing body 12 (e.g. Figure 1 As shown, the radially inner portion 137 of the heat shield 130 may have a gap with the outer peripheral wall 213 of the fixed vortex 21. However, in order to better block the heat from the high-pressure area, especially the heat from the high-temperature lubricating oil in the oil storage area at the bottom of the high-pressure area HP, preferably, the radially outer portion 138 of the heat shield 130 is in contact with the inner wall of the housing body 12, and the radially inner portion 137 of the heat shield 130 is in contact with the outer peripheral wall 213 of the fixed vortex 21.

[0042] Preferably, the heat insulation cover 130 is constructed as a sheet metal part, which can prevent the heat insulation cover 130 from deforming during the assembly of the compressor, such as during the welding of the upper end cover 11. On the other hand, the heat insulation cover 130 made of metal material has a better heat insulation effect than injection molded parts.

[0043] The following is combined Figure 11 The comparative examples shown provide a detailed description of the beneficial effects of the scroll compressor 100 and the heat insulation 130 according to the first embodiment of the present invention.

[0044] exist Figure 11In the comparative example shown, the basic structure and working principle of the scroll compressor 100a are similar to those of the first embodiment of the present invention, and therefore will not be described again. The difference lies in that the suction port 141a of the suction port accessory 14a of the scroll compressor 100a is located below the inlet 23 of the fixed scroll 21 at the housing body 12, and the scroll compressor 100a does not have a heat shield. Because the suction port 141a of the suction port accessory 14a of the scroll compressor 100a is relatively close to the motor, the working fluid entering the inlet 23 of the fixed scroll 21 is significantly affected by the motor's heat, easily leading to suction overheating and a decrease in the performance of the scroll compressor. However, in the scroll compressor 100 of the first embodiment of the present invention, because the suction port 141 is relatively far from the motor, the working fluid entering the inlet 23 of the fixed scroll 21 is less affected by the motor's heat. Furthermore, a heat shield 130 is provided to effectively block the high temperature of the high-pressure zone HP, thus improving the suction overheating situation and enhancing the performance of the scroll compressor 100.

[0045] Furthermore, in the comparative example, since the intake port 141a of the intake fitting 14a is located relatively far from the inlet 23 of the fixed scroll compressor 21, the scroll compressor 100a also has a guide pipe 130a for connecting the intake port 141a to the inlet 23, thereby guiding the working fluid from the intake port 141a to the inlet 23. The guide pipe 130a is composed of an interconnected main body and a cover plate, and has a generally tubular shape with openings at both ends and closed at the bottom and top. The guide pipe 130a includes a radially outer opening and a radially inner opening, with the radially outer opening surrounding the intake port 141a of the intake fitting 14a, and the radially inner opening surrounding the inlet 23 of the fixed scroll compressor 21. The upper end face 131a of the lower end of the flow guide pipe 130a is lower than the bottom end face of the intake port 141a (and even lower than the bottom end face 24 of the air inlet 23), while the lower end face 132a of the upper end of the flow guide pipe 130a is higher than the top end face 25 of the air inlet 23. Typically, both the main body and the cover plate of the flow guide pipe 130a are injection molded parts, assembled by ultrasonic welding, resulting in higher costs. Additionally, as... Figure 11 As shown, due to the design limitations imposed by the scroll mechanism and the shape and position of other components within the compressor, the internal flow channel of the guide pipe 130a is irregular and has a small flow area, which easily leads to significant flow resistance and pressure loss. Furthermore, because the guide pipe 130a is open on both sides, all (or most) of the working fluid entering the low-pressure zone LP from the intake port 141a is diverted by the guide pipe 130a to the intake port 23, resulting in insufficient working fluid for cooling the motor.

[0046] In contrast, in the first embodiment of the present invention, the heat shield 130 not only has a good heat insulation effect, improving the performance of the compressor, but also, due to its bottom opening and lack of an inner vertical wall, allows sufficient working fluid to flow to the motor to cool it, effectively preventing the motor from overheating. Furthermore, the heat shield 130 has a simple structure, minimal impact on the flow channels within the compressor, virtually no flow resistance to the working fluid, and is easy to manufacture, with simple assembly processes and low cost.

[0047] After testing, compared with the comparative example scroll compressor 100a, the overall energy efficiency ratio of the scroll compressor 100 according to the first embodiment of the present invention is improved by about 2.3%.

[0048] Figure 5 , Figure 6 and Figure 7 A scroll compressor 200 and a heat shield 230 according to a second embodiment of the present invention are shown. In the second embodiment of the present invention, the basic structure and working principle of the scroll compressor 200, as well as the basic structure and basic position of the heat shield 230 within the scroll compressor 200, are similar to those of the first embodiment, and therefore will not be described again.

[0049] The heat shield 230 includes a first wall portion 234, a second wall portion 235, a third wall portion 236, and a mounting portion 233. Unlike the heat shield 130 in the first embodiment, the mounting portion 233 is configured as a double lug protruding circumferentially outward from near the radially outer portions 238 of the second wall portion 235 and the third wall portion 236, respectively. Furthermore, the mounting portion 233 may also include a vertically adapting surface 2331 formed on the upper surface of the first wall portion 234. This vertically adapting surface 2331 has an arcuate shape that adapts to the inner wall surface of the lower edge of the sound-absorbing cover 13. Those skilled in the art will understand that this vertically adapting surface 2331 can be formed in two ways: first, as... Figure 6As shown, the first wall portion 234 is configured such that the portion near the radially outer side is lower and the portion near the radially inner side is higher, thereby forming a step portion between the two portions. The vertical surface of this step portion forms the vertical fitting surface 2331 of the mounting portion. Second, the first wall portion 234 is flat, and the mounting portion extends upward from the upper surface of the first wall portion 234 to form an arc-shaped strip. This mounting portion includes not only double lugs that project outward in the circumferential direction from the second wall portion 235 and the third wall portion 236 respectively, but also a connecting portion that extends upward from the upper surface of the first wall portion 234 and connects to the double lugs. The radially outer surface of this connecting portion forms the vertical fitting surface. The heat shield 230 is fixedly mounted to the muffler cover 13 by the mounting portion 233. The vertical fitting surface 2331 of the mounting portion 233 can fit against the inner wall surface of the lower edge of the muffler cover 13 and is fixedly mounted to the inner wall surface of the lower edge of the muffler cover 13 by, for example, bolts or by welding (spot welding).

[0050] In addition to achieving a similar effect to the heat insulation cover 130 installed on the fixed scroll 21 in the first embodiment, the heat insulation cover 230 in the second embodiment also has the following additional advantages: Since the space at the air inlet 23 of the fixed scroll 21 is limited, installing the heat insulation cover 230 on the muffler cover 13 can leave more design space at the air inlet 23; the heat insulation cover 230 can be welded to the muffler cover 13 before compressor assembly without affecting subsequent installation operations, eliminating the need to weld or bolt the heat insulation cover 230 during compressor assembly, further simplifying the assembly process; compared to the heat insulation cover 130 installed on the fixed scroll 21, the heat insulation cover 230 installed on the muffler cover 13 is axially closer to the high-pressure zone 13, thereby blocking the heat from the high-pressure zone 13 from being transferred to the working fluid at the air inlet 23 at a position farther from the air inlet 23, resulting in better heat insulation effect of the heat insulation cover 230, while also leaving more space for the flow of the working fluid and avoiding flow resistance.

[0051] Figure 8 A heat shield 330 according to a third embodiment of the present invention is shown. In the third embodiment of the present invention, the basic structure and working principle of the scroll compressor and the basic position of the heat shield 330 within the scroll compressor are similar to those of the first embodiment, and therefore will not be described again.

[0052] Unlike the heat shield 130 in the first embodiment, the heat shield 330 is constructed as an integrally formed arc-shaped first wall portion 334, second wall portion 335, and third wall portion 336, defining a generally semi-circular flow cross-section. That is, the heat shield 330 is a downwardly opening semi-circular tube shape. Preferably, the heat shield 330 may also be in a form that gradually narrows from the radially outer side to the radially inner side, with its flow cross-section gradually decreasing from the radially outer side to the radially inner side, thereby effectively preventing turbulence. The heat shield 330 also includes a mounting portion 333, which is constructed as a double lug protruding circumferentially outward from near the integral radially outer side portion 338 formed by the first wall portion 334, second wall portion 335, and third wall portion 336. Furthermore, the radially outer surface of the mounting portion 333 may be formed as a vertically adapting surface having an arcuate shape that adapts to the inner wall surface of the lower edge of the sound-absorbing cover 13. The heat shield 330 is fixedly installed to the muffler cover 13 by the mounting part 333. The vertical fitting surface of the mounting part 333 can fit against the inner wall surface of the lower edge of the muffler cover 13, and the mounting part 333 is fixedly installed on the inner wall surface of the lower edge of the muffler cover 13 by means of, for example, bolt fixing or welding (spot welding).

[0053] In addition to achieving a similar effect to the heat insulation cover 230 installed on the muffler cover 13 in the second embodiment, the heat insulation cover 330 in the third embodiment also has the following additional advantages: since the first wall portion 334, the second wall portion 335, and the third wall portion 336 are integrally formed and formed into a semi-circular tube shape with an open bottom, the heat insulation cover 330 has a simpler processing technology, is easier to produce and install, has a lower cost, and has less impact on the flow channel inside the compressor.

[0054] Figure 9 and Figure 10 A scroll compressor 400 and a heat shield 430 according to a fourth embodiment of the present invention are shown. In the fourth embodiment of the present invention, the basic structure and working principle of the scroll compressor 400 are similar to those of the first embodiment, and therefore will not be described again.

[0055] See Figure 10Unlike the heat shield 130 in the first embodiment, the heat shield 430 in the scroll compressor 400 is formed by interconnecting a first wall portion 434 extending generally radially and a first side vertical wall portion 435, a second side vertical wall portion 436, and an inner vertical wall portion 439 extending generally axially. The first side vertical wall portion 435, the second side vertical wall portion 436, and the inner vertical wall portion 439 all extend upward from the first wall portion 434. The first side vertical wall portion 435 and the second side vertical wall portion 436 are respectively disposed on both sides of the first wall portion 434 in the circumferential direction and are arranged opposite to each other. The inner vertical wall portion 439 is disposed circumferentially between the first side vertical wall portion 435 and the second side vertical wall portion 436 and is interconnected with the radially inner portions of the first wall portion 434, the first side vertical wall portion 435, and the second side vertical wall portion 436. In other words, the heat shield 430 is constructed in a generally L-shaped form with two openings, including an upward-opening top opening and an outer opening formed by the radially outer portions 438 of the first wall portion 434, the first side vertical wall portion 435, and the second side vertical wall portion 436, thereby defining an upward-opening heat insulation cavity 440. The heat shield 430 can be constructed in a form that gradually narrows from the radially outer side to the radially inner side, thereby increasing the area of ​​the heat insulation cavity located directly above the intake port 141, better blocking the heat of the high-pressure zone HP (especially the heat of the high-temperature lubricating oil in the oil storage area at the bottom of the high-pressure zone HP) from being transferred towards the vicinity of the intake port 141, thus improving the heat insulation effect.

[0056] Although Figure 10 The diagram shows a heat shield 430 including a first side vertical wall portion 435 and a second side vertical wall portion 436. However, those skilled in the art will understand that the heat shield 430 may also omit the first side vertical wall portion 435 and the second side vertical wall portion 436 and be constructed to include only a first wall portion 434 that extends generally radially and an inner vertical wall portion 439 that extends generally axially upward from the radially inner portion of the first wall portion 434. This configuration of the heat shield can also block the transfer of heat from the high-pressure area HP toward the air inlet 23, and the structure is simpler, easier to install, and lower in cost.

[0057] Additionally, the heat shield 430 includes a beveled edge 433, which extends outward from the top of the inner vertical wall portion 439 at an angle relative to the axial direction. Preferably, the beveled edge 433 has the same angle of inclination as the lower surface of the muffler cover 13, allowing the beveled edge 433 to fit against the lower surface of the muffler cover 13. This facilitates the blocking of heat from the high-pressure zone HP at a higher position and makes installation of the heat shield easier. The beveled edge 433 can serve as a mounting portion, through which the heat shield 430 is fixedly mounted to the muffler cover 13, for example, by bolts or by welding.

[0058] The following will refer to Figure 9 The specific installation position of the heat shield 430 in the scroll compressor 400 is described. In the scroll compressor 400, the heat shield 430 is installed at a position circumferentially aligned with the air inlet 23 of the fixed scroll 21, and is integrally positioned above the air inlet 23 of the fixed scroll 21. The air inlet 23 includes a bottom end face 24 that is axially closer to the moving scroll end plate 221 of the moving scroll 22, and a top end face 25 that is axially closer to the muffler cover 13 and opposite to the bottom end face 24. The heat shield 430 includes a first end face 431 that is axially closer to the moving scroll end plate 221 of the moving scroll 22, and a second end face axially closer to the muffler cover 13 and opposite to the first end face. The first end face includes a first end face 431 of the heat shield 430 formed by the lower surface of the first wall portion 434. The first end face 431 of the heat shield 130 is higher than the top face 25 of the air inlet 23 (and also higher than the top face of the intake port 141), meaning the first end face 431 of the heat shield 430 is further away from the end plate 221 of the moving vortex 22 than the top face 25 of the air inlet 23. Therefore, the heat shield 430 not only effectively blocks heat from the high-pressure area from being transferred to the working fluid at the air inlet 23, but also does not obstruct the flow of the working fluid toward the air inlet 23. Furthermore, since the heat shield 430 is entirely located above the air inlet 23, it also does not obstruct the flow of the working fluid toward the motor in the low-pressure area LP, thus achieving sufficient cooling of the motor.

[0059] Preferably, the radially outer portion 438 of the heat insulation cover 430 is fitted against the inner wall of the housing body 12, so that the outer opening of the heat insulation cover 430 is closed by the housing body 12. Thus, the heat insulation cavity 440 is jointly enclosed by the heat insulation cover 430, the sound-absorbing cover 13, and the housing body 12 to further improve the heat insulation effect. Preferably, there is a certain distance between the radially inner portion (e.g., the fourth wall portion 439) of the heat insulation cover 430 and the outer peripheral wall 213 of the fixed vortex 21, so as to avoid heat transfer towards the air inlet 23 as much as possible.

[0060] In addition, although Figure 9 and Figure 10 The diagram shows the heat shield 430 fixed to the soundproof cover 13 via the beveled edge (mounting part) 433. However, it is understood that the heat shield 430 may also omit the beveled edge and be directly fixed to the soundproof cover 13. The heat shield 430 may also be fixed (bolted or welded) to the housing body 12 via a mounting part located at other locations (e.g., near the radially outer portion 438 of the heat shield 430), or directly welded to the housing body 12 at its radially outer portion.

[0061] In addition to achieving a similar effect to the heat insulation cover 130 installed on the fixed vortex 21 in the first embodiment, the heat insulation cover 430 in the fourth embodiment also has the following additional advantages: Since the heat insulation cover 430 is located above the air inlet 23, it hardly affects the flow channel inside the compressor, thus avoiding the generation of flow resistance; the heat insulation cover 430 forms a heat insulation cavity 440 above the air inlet 23, which has a better heat insulation effect than relying on the heat insulation cover itself for heat insulation, and significantly improves the effect of intake overheating; the heat insulation cover 430 is installed on the muffler cover 13 or the housing body 12, which can leave more design space for the air inlet 23.

[0062] Although various embodiments of the invention have been described in detail herein, it should be understood that the invention is not limited to the specific embodiments described and shown herein, and other modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such modifications and variations fall within the scope of the invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A scroll compressor (100, 200, 400) comprising a housing (10), a scroll mechanism (20), and a heat shield (130, 230, 330, 430), the housing having an intake fitting (14) having an intake port (141) located at the housing, the scroll mechanism comprising a fixed scroll (21) having an outer peripheral wall (213) and a moving scroll (22) having a moving scroll end plate (221), the fixed scroll and the moving scroll meshing with each other to form a series of compression chambers (C) for compressing a working fluid, an inlet (23) being formed at the outer peripheral wall (213) for allowing the working fluid to enter the compression chamber, the inlet including a bottom end face (24) axially close to the moving scroll end plate and an opposite top end face (25). The heat insulation cover is installed at a position aligned circumferentially with the air inlet. Its features are, The heat shield includes a first end face (131, 431) axially close to the moving vortex end plate, and the first end face is further away from the moving vortex end plate than the bottom end face of the air inlet, wherein the heat shield is disposed radially between the housing and the fixed vortex.

2. The scroll compressor (100, 200) according to claim 1, wherein: The heat shield includes a first wall portion (134, 234, 334) extending generally radially, and a second wall portion (135, 235, 335) and a third wall portion (136, 236, 336) extending generally axially. The second wall portion and the third wall portion are respectively disposed on both circumferential sides of the first wall portion and extend downward from the first wall portion so as to be opposite each other, such that the heat shield defines a generally rectangular flow cross-section. The first end face is formed by the lower surfaces of the second wall portion and the third wall portion; or The heat shield (330) includes an arc-shaped first wall portion (334), a second wall portion (335), and a third wall portion (336), such that the heat shield opens downward and defines a generally semi-circular flow cross-section, the first end face being formed by the lower surfaces of the second wall portion and the third wall portion.

3. The scroll compressor (100, 200) according to claim 2, wherein, The heat shield has an outer opening (S1) formed by the radially outer portions (138, 238, 338) of the first wall portion, the second wall portion, and the third wall portion, and an inner opening (S2) formed by the radially inner portions (137, 237, 337) of the first wall portion, the second wall portion, and the third wall portion. The circumferential dimension (L1) of the outer opening (S1) is greater than the diameter (D) of the air intake port (141), and the circumferential dimension (L2) of the inner opening (S2) is greater than the circumferential dimension of the air inlet (23).

4. The scroll compressor (100, 200) according to claim 3, wherein, The circumferential dimension (L1) of the outer opening is greater than the circumferential dimension (L2) of the inner opening, and / or the heat shield is configured such that the flow cross-section of the heat shield gradually decreases along the direction from the outer opening toward the inner opening.

5. The scroll compressor (400) according to claim 1, wherein, The heat shield includes a first wall portion (434) that extends generally in a radial direction and an inner vertical wall portion (439) that extends generally in an axial direction upward from the radially inner side of the first wall portion, the first end face being formed by the lower surface of the first wall portion.

6. The scroll compressor (400) according to claim 5, wherein, The heat shield also includes a first side vertical wall portion (435) and a second side vertical wall portion (436) extending generally axially upward from both sides of the first wall portion, such that the heat shield defines an upwardly open heat shield cavity.

7. The scroll compressor (100, 200, 400) according to any one of claims 2 to 6, wherein, The lower surface of the first wall portion is further away from the moving vortex end plate than the top surface of the air inlet, and / or the lower surface of the first wall portion is further away from the moving vortex end plate than the top surface of the air intake port.

8. The scroll compressor (100, 200, 400) according to any one of claims 1 to 6, wherein, The radially outer portion (138, 238, 338, 438) of the heat shield is in contact with the inner wall of the housing (10).

9. The scroll compressor (100, 200) according to any one of claims 1 to 4, wherein, The radially inner portion (137, 237, 337) of the heat insulation cover is in contact with the outer peripheral wall.

10. The scroll compressor (100, 200) according to any one of claims 1 to 4, wherein, The heat shield is constructed without an inner vertical wall, thus being completely open radially inward.

11. The scroll compressor (100, 200, 400) according to any one of claims 1 to 6, wherein, The air intake port is aligned with the air inlet.

12. The scroll compressor (100, 200, 400) according to any one of claims 1 to 6, wherein, The scroll compressor also includes a muffler cover (13), and the heat insulation cover also includes mounting parts (133, 233, 333, 433), and the heat insulation cover is fixed to the muffler cover or the fixed scroll compressor through the mounting parts.

13. The scroll compressor (100, 200, 400) according to any one of claims 1 to 6, wherein, The heat insulation cover is constructed of sheet metal.

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