Scroll compressor

Abstract

The present application provides a kind of scroll compressor, including upper cover assembly, shell assembly, scroll assembly, upper support, inner shell stator assembly, crankshaft assembly, lower support, lower cover assembly. Wherein, scroll assembly is formed at least one pair of compression chamber after installation cooperation, inner shell stator assembly and crankshaft assembly drive scroll assembly and the refrigerant in its compression chamber is compressed.In the compressor inner shell stator assembly is equipped with inner shell assembly, including inner shell, gas guide plate, oil guide plate, inner shell is equipped with air inlet hole, exhaust hole, gas guide plate is equipped with air inlet hole, the upper balance block of crankshaft assembly is equipped with oil baffle, by controlling upper refrigerant and lower refrigerant has pressure difference, refrigerant and refrigeration oil channel separation and other measures, oil gas passage in the compressor is dredged, improve the oil return rate of compressor, reduce the oil discharge amount, ensure motor cooling, improve reliability.The present application structure design is simple, and application range is wide.

Description

Technical Field

[0001] This invention relates to the field of scroll compressor technology, and more specifically to a scroll compressor. Background Technology

[0002] In simple terms, the working principle of a scroll compressor is to compress the low-temperature, low-pressure refrigerant entering the compressor through the suction port into a high-temperature, high-pressure refrigerant through the relative motion of the scroll, and then discharge it from the exhaust port. For the internal low-pressure compressor, the low-temperature, low-pressure gas drawn into the compressor also serves as a cooling source for the motor. Therefore, the design of the refrigerant passage is crucial. Simultaneously, due to the relative motion of the mechanical parts, the friction pairs require lubrication, making the design of the refrigerant oil passage paramount. Refrigerant oil is typically pumped in through an oil hole inside the crankshaft. However, since the friction pairs are distributed in different locations within the compressor, the design of the refrigerant oil recovery passage is particularly important. To prevent refrigerant from carrying refrigerant oil out of the compressor and causing oil shortages, compressor designs generally separate the refrigerant passage and the refrigerant oil passage as much as possible. With the increasing cooling capacity of compressors, the design of the refrigerant passage and the refrigerant oil passage (especially the oil return passage) becomes increasingly important.

[0003] The shortcomings of existing technology are that high-capacity compressors are large in size and have a large internal space. If the refrigerant passage and the refrigeration oil return passage of the compressor are not planned and designed, it will increase the refrigerant's entrainment of the refrigeration oil, increase the amount of oil discharged by the compressor, and increase the risk of oil shortage in the compressor. At the same time, if the motor is not properly cooled, it will also reduce the reliability and safety of the compressor. Summary of the Invention

[0004] In response to the aforementioned technical problems, a scroll compressor is provided.

[0005] The technical means employed in this invention are as follows:

[0006] A scroll compressor includes an upper cover assembly, an outer shell assembly, a scroll assembly, an upper support, an inner shell stator assembly, a crankshaft assembly, a lower support, and a lower cover assembly. The inner shell stator assembly includes an inner shell and a motor stator installed in the middle of the inner shell. The upper and lower ends of the inner shell are connected to the upper support and the lower support, respectively. The crankshaft assembly includes a motor rotor located inside the motor stator and cooperating with the motor stator, a crankshaft connected to the motor rotor, and an upper balance block and a lower balance block located at the upper and lower parts of the crankshaft, respectively. The inner shell, the upper support, and the motor stator form an upper space, and the inner shell, the lower support, and the motor stator form a lower space.

[0007] The inner shell stator assembly also includes an air guide plate vertically mounted on the outer wall of the inner shell, forming a sealed cavity between the air guide plate and the inner shell; the outer wall of the air guide plate has an air inlet E communicating with the cavity, the air inlet E is opposite to the air intake pipe provided on the outer shell assembly, the upper part of the inner shell has an air inlet A above the air inlet E that communicates with the upper space and the cavity, and the inner shell has an air outlet B on the side wall opposite the air inlet A that communicates with the upper space; the lower part of the inner shell has an air inlet C below the air inlet E that communicates with the lower space and the cavity, and the inner shell has an air outlet D on the side wall opposite the air inlet C that communicates with the lower space.

[0008] The refrigerant enters the upper and lower spaces through the suction pipe, inlet E, inlet A, and inlet C. There is a pressure difference between the refrigerant entering the upper space and the refrigerant entering the lower space, which causes the refrigerant and refrigeration oil in the upper space to flow into the lower space through the gap between the motor rotor and the motor stator and the gap between the motor stator and the inner shell.

[0009] Furthermore, the inner shell stator assembly also includes an oil guide plate, which is fixedly connected to the outer wall of the inner shell. The oil guide plate is a U-shaped plate with its U-shaped opening facing the outer wall of the inner shell. The upper end of the oil guide plate is covered with a supporting oil drain hole, and the lower end of the oil guide plate is flush with the lower end of the inner shell.

[0010] Furthermore, the upper and lower balance blocks are semi-circular, with an oil baffle fixed to the upper balance block, forming a complete circular ring. This prevents or reduces the likelihood of the upper balance block breaking down during rotation, causing the oil flowing down from above under its own weight to be carried away by the refrigerant.

[0011] Furthermore, the inner diameter of the air inlet A is less than or equal to the inner diameter of the air inlet C, the inner diameter of the air outlet B is less than the inner diameter of the air inlet A, and the inner diameter of the air inlet C is less than the inner diameter of the air outlet D.

[0012] Furthermore, air inlet A and air outlet B are directly opposite each other and coaxial; air inlet C and air outlet D are opposite each other, and the upper edges of air inlet C and air outlet D are at the same height.

[0013] Furthermore, an intake pipe is fixed on the intake port E, which acts as an airflow guide, allowing more refrigerant to enter the air guide plate.

[0014] Furthermore, the empty space in the upper part is greater than the empty space in the lower part.

[0015] During compressor operation, refrigerant enters the outer casing assembly through the suction pipe and then enters the cavity through the intake port E. It then enters the inner casing in two directions, from the intake port A and the intake port C. Due to the size relationship between the holes A, B, C, and D, and the fact that the upper space is larger than the lower space, a pressure difference occurs between the upper and lower parts of the motor stator. This results in the upper pressure being greater than the lower pressure, causing the refrigerant to flow downwards through the gaps between the inner casing, the motor stator, and the motor rotor. This enhances the cooling effect of the motor stator and strengthens the recovery effect of the refrigerant oil that flows back from the upper support and crankshaft gap.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This invention features a compact structure. By optimizing the structure of the parts and controlling the refrigerant pressure difference between the upper and lower spaces, a refrigerant channel and a refrigeration oil recovery channel are constructed. This relatively separates the oil and gas channels inside the compressor, clears the oil and gas channels within the compressor, improves the compressor's oil return rate, reduces the amount of oil discharged, ensures motor cooling, and improves reliability. This invention has a simple structural design and a wide range of applications.

[0018] Based on the above reasons, this invention can be widely applied in fields such as scroll compressors. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a scroll compressor structure according to a specific embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of refrigerant flow within the outer casing assembly in a specific embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the flow of refrigeration oil inside the outer casing assembly in a specific embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the inner shell stator assembly structure in a specific embodiment of the present invention (with the stator hidden).

[0024] Figure 5 This is a schematic diagram of the structure of adding an air intake pipe to the inner shell stator assembly in a specific embodiment of the present invention (with the stator hidden).

[0025] Figure 6This is a schematic diagram of the crankshaft assembly structure in a specific embodiment of the present invention. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0033] like Figures 1-6 As shown, a scroll compressor includes an upper cover assembly 1, an outer shell assembly 2, a scroll assembly 3, an upper support 4, an inner shell stator assembly 5, a crankshaft assembly 6, a lower support 7, and a lower cover assembly 8.

[0034] The upper cover assembly 1 is fixedly connected to the upper part of the outer shell assembly 2, and the lower cover assembly 8 is fixedly connected to the lower part of the outer shell assembly 2. The outer shell assembly 2 has an air intake pipe.

[0035] The inner shell stator assembly 5 includes an inner shell 9, a motor stator 12 installed in the middle of the inner shell 9, an air guide plate 10, and an oil guide plate 11. The motor stator 12 is interference-fitted or welded to the inner shell 9. The inner shell 9 is a tubular component. The upper and lower ends of the inner shell 9 are axially connected to the upper support 4 and the lower support 5, respectively, and are radially connected by interference fit or bolts. The inner shell 9, the upper support 4, and the motor stator 12 form the upper space, and the inner shell 9, the lower support 7, and the motor stator 12 form the lower space.

[0036] The crankshaft assembly 6 includes a motor rotor 16 located within and cooperating with the motor stator 12, a crankshaft 13 connected to the motor rotor 16, and an upper balance block 14 and a lower balance block 17 located at the upper and lower parts of the crankshaft 13, respectively. The upper balance block 14, lower balance block 17, and motor rotor 16 are interference-fitted with the crankshaft 13. The upper part of the crankshaft 13 passes through the upper support 14 and is rotatably engaged with the upper support 14. The lower part of the crankshaft 13 passes through the lower support 15 and enters the lower cover assembly 8, and is rotatably engaged with the lower support 14. The upper balance block 14 and lower balance block 17 are semi-circular, and an oil baffle sleeve 15 is fixed on the upper balance block 14, forming a complete circular ring. This prevents or reduces the risk of the upper balance block 14 breaking up the oil flowing down from above under its own weight and being carried away by the refrigerant during rotation. The oil baffle 15 is fixed to the upper balance block 14 by bolts or rivets. The oil baffle 15 is a metal stamping or injection molding part. After being fixed to the upper balance block 14, it wraps around the upper balance block 14. The upper balance block 14 and the oil baffle 15 are in the upper space, and the lower balance block 17 is in the lower space. The lower balance block 17 has an oil drain hole that connects the lower space and the lower cover assembly.

[0037] The scroll assembly 3 is located inside the upper cover assembly 1. The scroll assembly 3 includes a moving scroll and a fixed scroll that works with the moving scroll. The moving scroll is connected to the top of the crankshaft 13. The motor stator 12 and the motor rotor 16 work together to drive the crankshaft 13 to rotate, which in turn drives the upper balance block 14, the lower balance block 17 and the fixed scroll to rotate. The fixed scroll and the moving scroll work together to compress the refrigerant in the compression chamber they generate.

[0038] The upper support 4 is supported inside the outer shell assembly 2 by an upper support block fixed to the inner wall of the outer shell assembly 2, and the lower support 7 is supported inside the outer shell assembly 2 by a lower support block fixed to the inner wall of the outer shell assembly 2, and the lower support 7 is fixedly connected to the lower support block.

[0039] The air guide plate 10 is vertically fixed to the outer wall of the inner shell 9. The air guide plate 10 is a sheet metal or stamped part. A sealed cavity is formed between the air guide plate 10 and the inner shell 9. The outer wall of the air guide plate 10 has an air inlet E that communicates with the cavity. The air inlet E is opposite to the air intake pipe provided on the outer shell assembly. The inner shell 9 has an air inlet A above the air inlet E that communicates with the cavity and the upper space. The inner shell 9 has an air outlet B on the side wall opposite the air inlet A that communicates with the upper space. The lower part of the inner shell 9 has an air inlet C below the air inlet E that communicates with the cavity. The inner shell 9 has an air inlet C below the air inlet E that communicates with the lower space. The inner shell 9 has an air outlet D on the side wall opposite the air inlet C that communicates with the lower space.

[0040] The upper space has more free space than the lower space. The inner diameter of air inlet A is less than or equal to the inner diameter of air inlet C; the inner diameter of air outlet B is less than the inner diameter of air inlet A; and the inner diameter of air inlet C is less than the inner diameter of air outlet D. Air inlet A and air outlet B are directly opposite each other and coaxial; air inlet C and air outlet D are positioned opposite each other, and their upper edges are at the same height. Figure 5 As shown, an intake pipe 18 is fixed to the intake port E, which guides the airflow, allowing more refrigerant to enter the air guide plate 10. The oil guide plate 11 is vertically fixed to the outer wall of the inner shell 9, without interfering with the intake port A, exhaust port B, intake port C, and exhaust port D. The oil guide plate 11 is a U-shaped plate, made of sheet metal or stamped, with its U-shaped opening facing the outer wall of the inner shell 9. The upper end of the oil guide plate 11 covers the oil drain hole 20 of the support 5, and the lower end of the oil guide plate 11 is flush with the lower end of the inner shell 9. Refrigerant enters the upper and lower spaces through the suction pipe 18, intake port E, intake port A, and intake port C. There is a pressure difference between the refrigerant entering the upper space and the refrigerant entering the lower space, causing the refrigerant and refrigeration oil in the upper space to flow into the lower space through the gap between the motor rotor 16 and the motor stator 12, and the gap between the motor stator 12 and the inner shell 9.

[0041] During compressor operation, refrigerant enters the outer casing assembly 2 through the suction pipe and enters the cavity through the intake port E. It then enters the inner casing 9 in two directions, from the intake port A and the intake port C. Due to the size relationship between the intake port A, exhaust port B, intake port C and exhaust port D, and the fact that the upper space of the inner casing 9 is larger than the lower space, a pressure difference occurs between the upper and lower parts of the motor stator 12. This results in the upper pressure being greater than the lower pressure, causing the refrigerant to flow downwards from the gap between the inner casing 9, the motor stator 12 and the motor rotor 16. This enhances the cooling effect of the motor stator 12 and strengthens the recovery effect of the refrigerant oil flowing back from the gap between the upper support 4 and the crankshaft 13.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scroll compressor, comprising an upper cover assembly, an outer shell assembly, a scroll assembly, an upper support, an inner shell stator assembly, a crankshaft assembly, a lower support, and a lower cover assembly, wherein the inner shell stator assembly includes an inner shell and a motor stator mounted in the middle of the inner shell, the upper and lower ends of the inner shell are respectively connected to the upper support and the lower support, the crankshaft assembly includes a motor rotor located inside the motor stator and cooperating with the motor stator, a crankshaft connected to the motor rotor, and an upper balance block and a lower balance block located at the upper and lower parts of the crankshaft respectively, the inner shell, the upper support, and the motor stator forming an upper space, and the inner shell, the lower support, and the motor stator forming a lower space, characterized in that: The inner shell stator assembly further includes an air guide plate vertically installed on the outer wall of the inner shell, forming a sealed cavity between the air guide plate and the inner shell; the outer wall of the air guide plate has an air inlet E communicating with the cavity, the air inlet E is disposed opposite to the air intake pipe disposed on the outer shell assembly, the inner shell has an air inlet A above the air inlet E communicating with the upper space and the cavity, the inner shell has an air outlet B on the side wall opposite the air inlet A communicating with the upper space; the inner shell has an air inlet C below the air inlet E communicating with the lower space and the cavity, the inner shell has an air outlet D on the side wall opposite the air inlet C communicating with the lower space; The refrigerant enters the upper space and the lower space through the suction pipe, the air inlet E, the air inlet A and the air inlet C, and there is a pressure difference between the refrigerant entering the upper space and the refrigerant entering the lower space, so that the refrigerant and refrigeration oil in the upper space flow to the lower space through the gap between the motor rotor and the motor stator and the gap between the motor stator and the inner shell; The inner diameter of the air inlet A is less than or equal to the inner diameter of the air inlet C, the inner diameter of the air outlet B is less than the inner diameter of the air inlet A, and the inner diameter of the air inlet C is less than the inner diameter of the air outlet D. The air inlet A and the air outlet B are directly opposite each other and coaxial; the air inlet C and the air outlet D are opposite each other, and the upper edges of the air inlet C and the air outlet D are at the same height.

2. A scroll compressor according to claim 1, characterized in that, The inner shell stator assembly also includes an oil guide plate, which is fixedly connected to the outer wall of the inner shell. The oil guide plate is a U-shaped plate with its U-shaped opening facing the outer wall of the inner shell. The upper end of the oil guide plate covers the oil drain hole of the upper support, and the lower end of the oil guide plate is flush with the lower end of the inner shell.

3. A scroll compressor according to claim 1, characterized in that, The upper balance block and the lower balance block are semi-circular, and an oil baffle is fixed on the upper balance block. The upper balance block and the oil baffle form a complete circular ring.

4. A scroll compressor according to claim 1, characterized in that, An air intake pipe is fixed on the air intake port E.

5. A scroll compressor according to claim 1, characterized in that, The empty space in the upper part is greater than the empty space in the lower part.

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