Scroll compressor with low oil circulation

Abstract

The invention discloses a scroll compressor with a low-oil circulation structure, which comprises a shell, and an air suction pipe for sucking a refrigerating medium is arranged below the shell; the compression part is arranged in the shell, and an air suction port and an air outlet are formed in the upper portion of the compression part; the driving part is connected with the compression part; the main bearing seat is arranged below the compression part; the low-pressure cavity is respectively communicated with the air suction pipe and the air suction port; wherein the low-pressure cavity is communicated with the air suction port through the communicating air channel, a refrigerating medium enters the low-pressure cavity through the air suction pipe and enters the compression part through the communicating air channel and the air inlet, and the refrigerating medium compressed by the compression part is discharged through the air outlet. Refrigerating media enter the low-pressure cavity in the compressor through the air suction port, then the refrigerating media enter the air suction port above the vortex part through the communicating air channel, an air suction loop is made to avoid a lubricating oil splashing area generated by relative movement of the thrust structure and the movable vortex plate, and the oil circulation rate is reduced.

Description

Technical Field

[0001] This invention belongs to the field of scroll compressor technology, and particularly relates to a scroll compressor with low oil circulation. Background Technology

[0002] A scroll compressor includes a compression mechanism for compressing working fluids (such as refrigerants), and compressor components include moving scrolls, stationary scrolls, and thrust structures.

[0003] Typically, the oil circulation rate can be used to characterize the amount of lubricating oil carried by the working fluid and the degree of lubrication provided to the scroll. The oil circulation rate is the percentage by mass of lubricating oil contained in the refrigerant discharged from the compressor. After the refrigerant enters the compressor, it intersects with the internal lubrication oil passages, causing the airflow to carry a certain amount of lubricating oil into the scroll. After lubricating the scroll, some of the lubricating oil is eventually discharged from the compressor along with the refrigerant.

[0004] However, excessively high oil circulation rates can lead to lubricating oil accumulation on the inner surface of the heat exchanger, reducing the system's heat exchange efficiency and energy efficiency. Excessive oil circulation can also cause insufficient oil storage in the compressor. Conversely, insufficient oil circulation rates result in inadequate lubrication between the scrolls, increasing the probability of wear and failure on the scroll friction surfaces. Therefore, the compressor's oil circulation rate needs to be controlled at a suitable level to ensure proper system and compressor operation.

[0005] Normally, the refrigerant in a compressor will pass through the thrust surface and the scroll plate, creating a lubricating oil splash zone. The airflow will carry a certain amount of lubricating oil into the scroll, increasing oil circulation and reducing the system's heat exchange efficiency. Over time, this can lead to insufficient oil in the compressor. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention discloses a scroll compressor with a low oil circulation structure. This structure physically isolates the compressor's suction circuit from the lubricating oil splash zone generated by the relative motion of the thrust structure and the moving scroll, eliminating the intersection of the air and oil circuits and achieving extremely low oil circulation. The refrigerant enters the low-pressure chamber within the compressor through the suction port, and then passes through a connecting air passage to the suction port above the scroll section, achieving a low oil circulation rate.

[0007] Specifically, this invention discloses a scroll compressor with a low-oil circulation structure, comprising:

[0008] The housing has a suction pipe at its lower part for drawing in the refrigerant;

[0009] The compression section is located inside the housing, and an air intake and an air outlet are provided on the top of the compression section;

[0010] A drive unit, which is connected to a compression unit, drives the compression unit to compress the refrigerant medium;

[0011] Main bearing housing, wherein the main bearing housing is disposed below the compression section;

[0012] A low-pressure chamber, which is connected to both the intake tube and the intake port; wherein...

[0013] The low-pressure chamber is connected to the air intake through a connecting air passage. The refrigerant enters the low-pressure chamber through the air intake pipe, passes through the connecting air passage and the air intake, and enters the compression section. The refrigerant compressed by the compression section is discharged through the air outlet.

[0014] By adopting the above scheme, the refrigerant enters the low-pressure cavity of the compressor through the suction port, and then enters the suction port above the scroll section through the connecting air passage. This allows the suction circuit to avoid the lubricating oil splashing area generated by the relative motion between the thrust structure and the moving scroll, thereby reducing the oil circulation rate.

[0015] Furthermore, the housing is provided with a lower gas collection hood inside, which is connected to the air intake pipe and is interference-fitted to the outer diameter of the drive unit.

[0016] Furthermore, the major diameter of the main bearing housing matches the inner diameter of the housing.

[0017] Furthermore, the low-pressure cavity is composed of the main bearing housing, the housing, and the lower gas collection hood.

[0018] By adopting the above scheme, the setting of the lower gas hood restricts the downward flow of the cooling airflow, and the main bearing seat restricts the upward flow of the cooling airflow, so that the cooling airflow in the low-pressure cavity enters the connecting air passage.

[0019] Furthermore, the housing is also provided with an upper gas collection hood, which is located above the drive unit and is interference-fitted with the outer diameter of the drive unit.

[0020] Furthermore, the upper gas collection hood is provided with an exhaust port that communicates with the communicating air passage.

[0021] Furthermore, the low-pressure cavity is composed of the upper gas collection hood, the shell, and the lower gas collection hood.

[0022] By adopting the above scheme, an upper air collection hood is set above the drive unit. The upper air collection hood restricts the upward flow of the cooling airflow. The exhaust port opened on the upper air collection hood allows the cooling airflow in the low-pressure cavity to flow out and enter the intake port through the connecting air passage.

[0023] Furthermore, the side wall of the main bearing housing is provided with a reinforcing part, and a guide part is provided above the reinforcing part and outside the compression part. The connecting air passage is opened on the side wall of the reinforcing part and the guide part.

[0024] By adopting the above solution, the connecting air passage is located inside the compressor, and a reinforcing part is provided on the outer circle of the main bearing housing. The connecting air passage is opened on the side wall of the reinforcing part and the guide part, thus saving space in the compressor.

[0025] Furthermore, the connecting air passage is located outside the housing.

[0026] By adopting the above solution, the connecting air passage is located outside the housing, which facilitates the disassembly and maintenance of the connecting air passage. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0028] Figure 1 This is a cross-sectional view of the connecting air passage of a scroll compressor outside the casing;

[0029] Figure 2 This is a cross-sectional view of another embodiment of a scroll compressor's connecting air passage outside the housing;

[0030] Figure 3 This is a cross-sectional view of the connecting air passage of a scroll compressor inside the casing;

[0031] Figure 4 This is a cross-sectional view of another embodiment of the scroll compressor's connecting air passage inside the housing;

[0032] Figure 5 This is a schematic diagram of the connecting air passage of a scroll compressor inside the casing;

[0033] Figure 6 This is a schematic diagram of the lower gas collection shroud of a scroll compressor with a low oil circulation structure;

[0034] Figure 7 This is a schematic diagram of the upper gas collection shroud of a scroll compressor with a low oil circulation structure.

[0035] The reference numerals in the attached drawings are as follows: housing 1, intake pipe 11, drive unit 2, lower gas collection hood 21, upper gas collection hood 22, exhaust port 221, compression unit 3, main bearing seat 4, reinforcement unit 41, low-pressure cavity 5, connecting air passage 6, guide unit 7. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings.

[0037] like Figure 1-7 As shown, this invention discloses a scroll compressor with a low-oil circulation structure, comprising:

[0038] The housing 1 has a suction pipe 11 for drawing in the refrigerant at its lower part;

[0039] Compression unit 3 is placed inside housing 1, and an air intake and an air outlet are provided on the top of compression unit 3;

[0040] Drive unit 2 is connected to compression unit 3 and drives compression unit 3 to compress the refrigerant medium;

[0041] Main bearing housing 4 is located below the compression section;

[0042] The low-pressure chamber 5 is connected to the suction pipe 11 and the suction port, respectively; wherein,

[0043] The low-pressure chamber 5 is connected to the air intake through the connecting air passage 6. The refrigerant enters the low-pressure chamber 5 through the air intake pipe 11, passes through the connecting air passage 6 and the air intake, and enters the compression section 3. The refrigerant compressed by the compression section 3 is discharged through the air outlet.

[0044] The refrigerant enters the low-pressure chamber 5 inside the compressor through the suction port, and then passes through the connecting air passage 6 to enter the suction port above the scroll section. This allows the suction circuit to avoid the lubricating oil splashing area generated by the relative movement of the thrust structure and the moving scroll, reducing the oil circulation rate and improving the compressor's energy efficiency.

[0045] The housing 1 has a lower gas collecting hood 21 inside, which is connected to the suction pipe 11 and is interference-fitted to the outer diameter of the drive unit 2. The outlet of the lower gas collecting hood 21 is connected to the inlet of the lower gas collecting hood 21. The refrigerant entering through the suction pipe 11 enters the lower gas collecting hood 21, and the lower gas collecting hood 21 restricts the downward flow of the refrigerant, causing the refrigerant to move upward along the gap of the drive unit 2 or the flow groove in the stator and rotor.

[0046] In some embodiments of the present invention, the low-pressure cavity 5 is composed of a main bearing seat 4, a housing 1, and a lower gas collection hood 21. The major diameter of the main bearing seat 4 matches the inner diameter of the housing 1. In addition, a reinforcing part 41 is provided on the side wall of the main bearing seat 4, and a guide part 7 is provided above the reinforcing part 41 and outside the compression part 3. A connecting air passage 6 is opened on the side wall of the reinforcing part 41 and the guide part 7.

[0047] The refrigerant continues to move upward through the drive unit 2, while the upper main bearing seat 4 restricts the upward movement of the refrigerant to prevent it from entering the upper lubricating oil splash area. The refrigerant enters the air inlet through the connecting air passage 6, and is discharged from the air outlet after being compressed by the compression unit.

[0048] In another embodiment of this solution, the difference from the above embodiment is that the connecting air passage 6 is located outside the housing 1, and the refrigerant passes through the housing 1, through the connecting air passage 6, and enters the air inlet.

[0049] In some embodiments of the present invention, the housing 1 is further provided with an upper gas collection hood 22, which is located above the driving part 2 and is interference-fitted with the outer diameter of the driving part 2. The upper gas collection hood 22 is provided with an exhaust port 221 that communicates with the connecting air passage 6. The low-pressure cavity 5 is composed of the upper gas collection hood 22, the housing 1, and the lower gas collection hood 21.

[0050] In addition, the side wall of the main bearing housing 4 is provided with a reinforcing part 41, and a guide part 7 is provided above the reinforcing part 41 and outside the compression part 3. The reinforcing part 41 and the guide part 7 are connected by bolts or pins, and the connecting air passage 6 is opened on the side wall of the reinforcing part 41 and the guide part 7.

[0051] Similarly, the lower gas collector 21 restricts the downward movement of the refrigerant gas, causing the refrigerant medium to move upward along the gap in the drive unit 2 or the flow groove in the stator and rotor. The upper gas collector 22 above the drive unit 2 restricts the upward movement of the refrigerant medium, preventing it from entering the upper lubricating oil splashing area. The refrigerant medium enters the air inlet through the connecting air passage 6, and is discharged from the air outlet after being compressed by the compression unit 3.

[0052] In another embodiment of this solution, the difference from the above embodiment is that the connecting air passage 6 is located outside the housing 1, and the refrigerant passes through the housing 1, through the connecting air passage 6, and enters the air inlet.

[0053] The working principle of this invention is as follows:

[0054] The refrigerant enters the low-pressure chamber inside the compressor through the suction pipe 11. Under the action of the lower gas collecting shroud 21, the refrigerant moves upward along the gap of the drive section or the flow groove in the stator and rotor. Under the restriction of the upper gas collecting shroud 22 or the main bearing seat 4, the refrigerant enters the suction port through the connecting air passage 6. After being compressed by the compression section 3, the refrigerant is discharged at the outlet.

[0055] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this invention, and these all fall within the protection scope of this invention.

Claims

1. A scroll compressor with low oil circulation, characterized in that, include: The housing (1) has a suction pipe (11) for drawing in the refrigerant below it; Compression section (3), the compression section (3) is placed inside the housing (1), and an air intake and an air outlet are provided on the top of the compression section (3); The driving unit (2) is connected to the compression unit (3) and drives the compression unit (3) to compress the refrigerant. Main bearing housing (4), which is located below the compression section (3); A low-pressure chamber (5) is connected to an air intake pipe (11) and an air intake port, respectively; wherein, The low-pressure chamber (11) is connected to the air intake through the connecting air passage (6). The refrigerant enters the low-pressure chamber (5) through the air intake pipe (11), passes through the connecting air passage (6) and the air inlet, and enters the compression section (3). The refrigerant compressed by the compression section (3) is discharged through the air outlet.

2. The scroll compressor with low oil circulation according to claim 1, characterized in that, The housing (1) is provided with a lower gas collection hood (21) inside. The lower gas collection hood (21) is connected to the air intake pipe (11) and is interference-fitted to the outer diameter of the drive unit (2).

3. The scroll compressor with low oil circulation according to claim 2, characterized in that, The major diameter of the main bearing housing (4) matches the inner diameter of the housing (1).

4. The scroll compressor with low oil circulation according to claim 3, characterized in that, The low-pressure cavity (5) is composed of the main bearing seat (4), the housing (1), and the lower gas collection hood (21).

5. The scroll compressor with low oil circulation according to claim 2, characterized in that, The housing (1) is also provided with an upper gas collection hood (22), which is located above the drive unit (2) and is interference-fitted with the outer diameter of the drive unit (2).

6. The scroll compressor with low oil circulation according to claim 5, characterized in that, The upper gas collection hood (22) is provided with an exhaust port (221) that communicates with the communicating air passage (6).

7. The scroll compressor with low oil circulation according to claim 6, characterized in that, The low-pressure cavity (5) is composed of the upper gas collection hood (22), the shell (1), and the lower gas collection hood (21).

8. The scroll compressor with low oil circulation according to claim 4 or 7, characterized in that, The main bearing housing (4) has a reinforcing part (41) on its side wall, and a guide part (7) is provided above the reinforcing part (41) and outside the compression part (3). The connecting air passage (6) is opened on the side wall of the reinforcing part (41) and the guide part (7).

9. The scroll compressor with low oil circulation according to claim 4 or 7, characterized in that, The connecting air passage (6) is located outside the housing (1).

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