Pump body assembly, rotary compressor, air conditioner

Abstract

This invention provides a pump assembly, a rotary compressor, and an air conditioner. One pump assembly includes an exhaust chamber with a first exhaust port. A silencer is located downstream of the first exhaust port to buffer and reduce noise from the airflow discharged from the first exhaust port. A second exhaust port is constructed on the silencer. The flow area of ​​the first exhaust port is S1, and the flow area of ​​the second exhaust port is S0, where 0.314 < S0 / S1 < 0.865. The pump assembly, rotary compressor, and air conditioner provided by this invention can reduce the compressor's oil discharge rate, thereby mitigating the risk of insufficient lubrication due to excessive oil discharge and improving the compressor's cooling capacity, thus achieving high compressor efficiency.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a pump assembly, a rotary compressor, and an air conditioner. Background Technology

[0002] A rotary compressor, also known as a rolling rotor compressor, consists of a cylinder, rollers, a crankshaft, upper and lower flange assemblies (including upper and lower flanges, exhaust valve plates, and valve plate limiting baffles), and vanes. These components work together to form a sealed high-pressure chamber (exhaust chamber or compression chamber) and a low-pressure chamber (intake chamber). The vanes are fitted with a clearance groove in the cylinder vane slot, reciprocating within the groove. This causes a periodic change in the volume of the high and low pressure chambers. When the volume of the compression chamber decreases to a certain level, and the gas pressure within the compression chamber reaches or exceeds the back pressure on the valve plate above the flange exhaust port, the valve plate opens, and the gas in the compression chamber is discharged out of the chamber through the flange exhaust port, thus achieving the periodic intake and exhaust of the compressor. To reduce exhaust aerodynamic noise, a silencer is usually installed on the flange exhaust passage. The exhaust airflow undergoes reactive noise reduction through the silencer's expansion chamber before exiting the pump body through the silencer exhaust port into the compressor housing.

[0003] Rotary compressors are increasingly trending towards miniaturization, inevitably limiting the design space for smaller compressor series. To meet cooling capacity demands, higher frequency operation is becoming a development trend for compressors. However, for smaller compressor series, higher frequency operation easily leads to an increased oil discharge rate. A large amount of refrigerant lubricating oil is discharged into the system in gaseous form along with the high-pressure gas, resulting in insufficient lubrication inside the compressor and causing reliability issues. Furthermore, the large amount of lubricating oil in the exhaust gas reduces cooling capacity and compressor efficiency, hindering high-efficiency compressor design. Currently, industry practices often focus on limiting the exhaust ports of the muffler and flange (or exhaust chamber) to reduce compressor exhaust noise levels. After extensive research, the inventors discovered that limiting the exhaust ports of the muffler and flange based on noise reduction cannot effectively control the oil discharge rate of the compressor. Therefore, this invention was proposed. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a pump body assembly, a rotary compressor, and an air conditioner that can reduce the compressor oil discharge rate, reduce the compressor reliability risk caused by insufficient lubrication due to excessive oil discharge rate, and improve the compressor cooling capacity to achieve compressor high efficiency.

[0005] To address the aforementioned problems, the present invention provides a pump body assembly, including an exhaust chamber. The exhaust chamber is configured with a first exhaust port, and a muffler is provided downstream of the first exhaust port. The muffler is used to buffer and reduce noise in the airflow discharged from the first exhaust port. A second exhaust port is configured on the muffler. The flow area of ​​the first exhaust port is S1, and the flow area of ​​the second exhaust port is S0, where 0.314 < S0 / S1 < 0.865.

[0006] Preferably, 0.42 < S0 / S1 < 0.75.

[0007] Preferably, 0.58 < S0 / S1 < 0.65.

[0008] Preferably, the equivalent diameter of the second exhaust port is d0, and the equivalent diameter of the first exhaust port is d1, where 0.56d1 < d0 < 0.93d1.

[0009] Preferably, the pump body assembly further includes a first flange, a crankshaft, and a motor rotor. The first flange is fitted onto the crankshaft, the first exhaust port is constructed on the first flange, and the muffler covers and connects to the side of the first flange away from the first cylinder. Along the axial direction of the crankshaft, the first rotor forms a first projection area on the muffler, and the second exhaust port is located outside the first projection area.

[0010] Preferably, the muffler has a circumferential vertical wall extending axially along the crankshaft, and the second exhaust port is located on the circumferential vertical wall.

[0011] Preferably, the second exhaust port is circular or elliptical.

[0012] Preferably, the muffler is a double-layer muffler or a multi-layer muffler.

[0013] The present invention also provides a rotary compressor, including the pump body assembly described above.

[0014] The present invention also provides an air conditioner including the rotary compressor described above.

[0015] The present invention provides a pump assembly, a rotary compressor, and an air conditioner. By adjusting the ratio of S0 and S1, the high-frequency oil discharge rate of the compressor can be reduced, thereby mitigating the reliability risk of insufficient lubrication due to excessive oil discharge rate. At the same time, the cooling capacity of the compressor is improved to achieve high efficiency, and the effective lubrication of the compressor pump body friction pair parts is further ensured, thereby reducing the mechanical noise of the compressor to a certain extent. Attached Figure Description

[0016] Figure 1 A cross-sectional structural schematic diagram of the pump body assembly according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A magnified view of a section at point M;

[0018] Figure 3 for Figure 1 A schematic diagram of one embodiment of a silencer;

[0019] Figure 4 for Figure 3 Cross-sectional view of AA in the middle;

[0020] Figure 5 for Figure 1 A schematic diagram of another embodiment of the silencer;

[0021] Figure 6 for Figure 5 Cross-sectional view of BB in the middle;

[0022] Figure 7 for Figure 1 A schematic diagram of another embodiment of the silencer;

[0023] Figure 8 for Figure 1 A schematic diagram of another embodiment of the silencer.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Exhaust chamber; 11. First exhaust port; 2. Muffler; 21. Second exhaust port; 22. Circumferential vertical wall; 31. First flange; 32. First cylinder; 33. Crankshaft; 34. Second flange; 35. First roller. Detailed Implementation

[0026] See also Figures 1 to 8As shown in the figure, according to an embodiment of the present invention, a pump body assembly is provided, including a first flange 31, a second flange 34, a first cylinder 32, a crankshaft 33, and a vane (not shown). The first cylinder 32 has a hollow structure. The first flange 31 and the second flange 34 are respectively located at the axial ends of the first cylinder 32. The crankshaft 33 passes through the first flange 31 and the second flange 34, and the crankshaft 33 has an eccentric portion. A first roller 35 is sleeved on the eccentric portion. The vane is slidably connected in a groove of the first cylinder 32, and the end of the vane abuts against the outer peripheral wall of the first roller 35, thereby dividing the hollow structure into an intake chamber (low-pressure chamber). The system includes an exhaust chamber 1 (high-pressure chamber), which has a first exhaust port 11. Specifically, the first exhaust port 11 can be constructed on the first flange 31, for example. A silencer 2 is provided downstream of the first exhaust port 11. The silencer 2 is used to buffer and reduce noise from the airflow discharged from the first exhaust port 11. A second exhaust port 21 is constructed on the silencer 2. The flow area of ​​the first exhaust port 11 is S1, and the flow area of ​​the second exhaust port 21 is S0, where 0.314 < S0 / S1 < 0.865. In this technical solution, by adjusting the ratio of S0 and S1, the high-frequency oil discharge rate of the compressor can be reduced, thereby reducing the compressor reliability risk caused by insufficient lubrication due to excessive oil discharge rate. At the same time, the compressor's cooling capacity is improved to achieve high efficiency, further ensuring effective lubrication of the compressor pump body friction pair components, thus reducing compressor mechanical noise to a certain extent. Furthermore, 0.42 < S0 / S1 < 0.75. Ideally, 0.58 < S0 / S1 < 0.65.

[0027] The second exhaust port 21 can be circular or elliptical (e.g., Figure 7 As shown, the second exhaust port 21 can be made in a relatively regular shape, which simplifies the manufacturing process. The second exhaust port 21 can also be made in other irregular shapes (such as...). Figure 8 As shown), of course, the shape of the first exhaust port 11 can also be selected as described above. The limitation on the second exhaust port 21 can be achieved using an equivalent diameter, where the equivalent diameter of the second exhaust port 21 is d0, and the equivalent diameter of the first exhaust port 11 is d1. 0.56d1 < d0 < 0.93d1 is understandable. Furthermore, the pump body assembly can be a single working chamber (single cylinder) or multiple working chambers (multiple cylinders). The number of exhaust ports of the same muffler or flange can be one or more. When there are multiple cylinders or multiple exhaust ports, the flow area S0 of the second exhaust port 21 and the flow area S1 of the first exhaust port 11 refer to the sum of the flow areas of each exhaust port of each muffler and the sum of the flow areas of the exhaust ports of the flange, respectively.

[0028] Preferably, the pump body assembly further includes a motor rotor (not shown in the figure), which is mounted on the crankshaft 33 to drive the rotation of the crankshaft 33. The first flange 31 is mounted on the crankshaft 33, and the first exhaust port 11 is constructed on the first flange 31. The muffler 2 covers and is connected to the side of the first flange 31 away from the first cylinder 32. Along the axial direction of the crankshaft 33, the first rotor forms a first projection area on the muffler 2. The second exhaust port 21 is located outside the first projection area, thereby ensuring that the airflow from the second exhaust port 21 will not directly impact the high-speed rotating motor rotor. This allows the exhaust gas to avoid the rotating motor rotor and impact the stationary motor stator end face, further separating the exhaust gas on the motor stator end face. This reduces the oil discharge rate and minimizes the impact of the gas discharged from the muffler 2 on the rotating motor rotor end face above it, thus avoiding large airflow pulsations. This reduces the aerodynamic noise caused by exhaust airflow pulsations, reduces motor rotation power consumption, and improves compressor energy efficiency.

[0029] Furthermore, the muffler 2 has a circumferential vertical wall 22 extending axially along the crankshaft 33, and the second exhaust port 21 is located on the circumferential vertical wall 22. In this technical solution, changing axial exhaust to lateral exhaust allows the exhaust gas to completely avoid the compressor motor rotor, causing the gas discharged from the muffler 2 to impact the stationary flange skirt or compressor housing, reducing the oil discharge rate while further reducing airflow pulsation and motor power consumption, thus achieving the effect of improving efficiency and reducing noise.

[0030] Preferably, the muffler is a double-layer muffler or a multi-layer muffler.

[0031] The present invention also provides a rotary compressor, including the pump body assembly described above.

[0032] The present invention also provides an air conditioner including the rotary compressor described above.

[0033] The inventors verified the effectiveness of the technical solution of this invention in a specific compressor prototype, as shown in the table below. The main improvements are a significant reduction in the compressor's oil discharge rate, a substantial increase in energy efficiency, and a certain degree of reduction in total noise across the entire frequency range and below 1000Hz. Compared to existing compressors, the actual oil discharge rate, performance, and noise test data of the compressor using this invention show that, under the national standard 80Hz operating condition, the oil discharge rate decreased from 2.17% to 1.26%, the total noise level across the entire frequency range decreased by 1.2 dBA, the total noise level below 1000Hz decreased by 2.35 dBA, and the energy efficiency COP increased by 1.5%.

[0034]

[0035] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A pump body assembly, characterized by, The exhaust cavity (1) is configured with a first exhaust port (11), a muffler (2) is arranged downstream of the first exhaust port (11) and used for buffering and noise reduction of the airflow discharged by the first exhaust port (11), the muffler (2) is configured with a second exhaust port (21), the flow area of the first exhaust port (11) is S1, the flow area of the second exhaust port (21) is S0, and 0.58 < S0 / S1 < 0.65, so as to reduce the high-frequency oil discharge rate of the compressor.

2. The pump body assembly of claim 1, wherein, Further comprising a first flange (31), a crankshaft (33) and a motor rotor, the first flange (31) is sleeved on the crankshaft (33), the first exhaust port (11) is configured on the first flange (31), the muffler (2) is connected to the side of the first flange (31) away from the first cylinder (32), the motor rotor forms a first projection area on the muffler (2) along the axial direction of the crankshaft (33), and the second exhaust port (21) is outside the first projection area.

3. The pump body assembly of claim 2, wherein, The muffler (2) has a circumferential vertical wall (22) extending along the axial direction of the crankshaft (33), and the second exhaust port (21) is on the circumferential vertical wall (22).

4. The pump body assembly of claim 1, wherein, The second exhaust port (21) is circular or elliptical.

5. The pump body assembly of claim 1, wherein, The muffler is a double-layer muffler or a multi-layer muffler.

6. A rotary compressor comprising a pump body assembly, characterized by, The pump body assembly is the pump body assembly in any one of claims 1 to 5.

7. An air conditioner comprising a rotary compressor, characterized by comprising: The rotary compressor is the rotary compressor in claim 6.

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