Oil equalizing pipe structure for rotor type compressor and compressor

Abstract

The present invention provides an oil balancing pipe structure for a rotary compressor and a compressor, comprising a housing, an exhaust pipe and an oil balancing pipe disposed externally of the housing, the exhaust pipe disposed at the top end of the housing, one end of the oil balancing pipe connected to the exhaust pipe, the other end of the oil balancing pipe passing through the side of the housing and communicating with the interior of the housing, a cylinder disposed within the housing, the cylinder including an upper cylinder head provided with a refrigerant passage, and a cover plate disposed within the housing, the cover plate being located directly above the opening at the other end of the oil balancing pipe. The present invention has the advantages of reducing oil yield and improving compressor performance.

Description

Technical Field

[0001] The present invention relates to the field of compressors, in particular to an oil equalizing pipe structure for a rotor type compressor. Background Art

[0002] The motor of a rotary compressor does not convert the rotor's rotational motion into reciprocating motion of the piston. Instead, it directly drives the rotating piston to compress the refrigerant vapor. This type of compressor is more suitable for small air conditioners, especially household air conditioners. Rotary compressors have the advantages of a simple structure with few parts, few vulnerable parts, and reliable operation.

[0003] A multi-split central air conditioner (MSP) is a type of consumer central air conditioner, commonly known as "one-to-many." It features a single outdoor unit connected to two or more indoor units via piping, using air-cooled heat exchange on the outdoor side and direct evaporative heat exchange on the indoor side. Multi-split systems are increasingly popular in small and medium-sized buildings and some public buildings.

[0004] Compared to traditional central air conditioning systems, multi-split central air conditioners offer the following advantages: energy conservation and low operating costs; advanced control and reliable operation; adaptable units with a wide cooling and heating temperature range; high design flexibility, and convenient installation and billing. Multi-split air conditioners offer significant advantages over traditional air conditioners: they utilize a completely new concept and integrate multiple advanced technologies, including one-to-many, intelligent control, multiple health technologies, energy-saving, and network control, meeting consumer demands for comfort and convenience.

[0005] Energy conservation and environmental protection are two major themes in the refrigeration and air conditioning industry. Given the increasing demand for energy conservation, the energy efficiency ratings of air conditioners are also being further enhanced. The oil balancing pipe in existing multi-split units (VRFs) connects one end to the exhaust pipe and the other end to the compressor housing, located below the refrigerant channel. As the oil and refrigerant circulate within the compressor housing, pressure differentials can occur. Oil and refrigerant dripping near the oil balancing pipe outlet can easily be discharged through the pipe and out of the exhaust pipe, increasing the compressor's oil output and affecting compressor performance.

[0006] Therefore, those skilled in the art have devoted themselves to developing an upper cylinder head structure and a compressor thereof that can reduce the oil yield and improve the performance of the compressor. Summary of the Invention

[0007] In response to the problems in the prior art, the purpose of the present invention is to provide an oil equalizing pipe structure for a rotary compressor and a compressor thereof, so that the oil output rate of the rotary multi-compressor is close to 1%, thereby improving the stability of the compressor performance test.

[0008] According to one aspect of the present invention, there is provided an oil balancing pipe structure for a rotary compressor, which is suitable for a rotary compressor. The rotary compressor includes a shell, an exhaust pipe and an oil balancing pipe are provided outside the shell, the exhaust pipe is provided at the top end of the shell, one end of the oil balancing pipe is connected to the exhaust pipe, and the other end of the oil balancing pipe passes through the side of the shell and communicates with the inside of the shell, the other end of the oil balancing pipe includes an external tube, an insertion end and a seat ring, the external tube is connected to the insertion end, the external tube is located outside the shell, the insertion end is located inside the shell, the seat ring is sleeved on the insertion end, and the length of the seat ring is greater than the length of the insertion end.

[0009] Preferably, the aperture of the seat ring opening is larger than the aperture of the insertion end opening.

[0010] Preferably, the seat ring is fixed to the extending end via threads.

[0011] Preferably, the seat ring is further provided with an opening.

[0012] Preferably, a cylinder is provided in the shell, the cylinder includes an upper cylinder cover, a refrigerant channel is provided on the upper cylinder cover, and an outlet of the refrigerant channel avoids the opening at the other end of the oil balancing pipe.

[0013] Preferably, a cylinder is provided in the shell, the cylinder includes an upper cylinder cover, a refrigerant channel is provided on the upper cylinder cover, and a cover plate is further provided in the shell, the cover plate is located directly above the opening at the other end of the oil balancing pipe.

[0014] Preferably, the cover plate is located between the coolant channel of the upper cylinder cover and the opening at the other end of the oil balancing pipe.

[0015] Preferably, the cover plate is in the shape of a plate or a bent plate.

[0016] Preferably, the cover plate is welded or bonded to the bottom surface of the upper cylinder cover.

[0017] According to another aspect of the present invention, a compressor is provided, comprising the above-mentioned oil balancing pipe structure for a rotary compressor.

[0018] The oil equalizing pipe structure for a rotor type compressor and the compressor thereof of the present invention have the advantages of reducing the oil output rate and improving the performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0020] Figure 1 is a schematic structural diagram of a rotary compressor according to an embodiment of the present invention;

[0021] Figure 2 1 is a schematic structural diagram of an oil equalizing pipe of a rotary compressor according to an embodiment of the present invention;

[0022] Figure 3 1 is a schematic structural diagram of an upper cylinder head assembly of a rotary compressor according to an embodiment of the present invention;

[0023] Figure 4 1 is a schematic structural diagram of a cover plate of a rotary compressor according to an embodiment of the present invention;

[0024] Figure 5 1 is a schematic structural diagram of a bent cover plate of a rotary compressor according to an embodiment of the present invention;

[0025] Figure 6 1 is a schematic structural diagram of an oil equalizing pipe and a housing of a rotary compressor according to an embodiment of the present invention;

[0026] Figure 7 1 is a schematic structural diagram of the other end of the oil equalizing pipe of the rotary compressor according to an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the structure of the oil equalizing pipe seat ring of the rotary compressor according to an embodiment of the present invention.

[0028] Reference numerals

[0029] 1 Housing

[0030] 2 exhaust pipes

[0031] 3 oil pipes

[0032] 31 The other end of the oil pipe

[0033] 32 external tube

[0034] 33 Insertion end

[0035] 34 seat ring

[0036] 35 pressure welding section

[0037] 36 external segments

[0038] 37 openings

[0039] 4 cylinders

[0040] 41 Upper cylinder head DETAILED DESCRIPTION

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the figures represent identical or similar structures, and thus a repeated description thereof will be omitted.

[0042] like Figure 1 As shown in , in an embodiment of the present invention, an oil equalizing pipe structure for a rotary compressor and a compressor are provided, preferably a multi-unit unit composed of dual-rotor compressors.

[0043] The rotary compressor comprises a shell 1 , and an exhaust pipe 2 and an oil equalizing pipe 3 are arranged outside the shell 1 .

[0044] The exhaust pipe 2 is provided at the top of the housing 1. Preferably, the exhaust pipe 2 is a flared type, i.e. Figure 1 The aperture of the upper opening shown in FIG is larger than that of the lower opening, thereby reducing the oil circulation rate (OCR) of the compressor.

[0045] Combined with Figure 2 As shown in FIG, one end of the oil balancing pipe 3 is connected to the exhaust pipe 2 , and the other end 31 of the oil balancing pipe 3 passes through the side surface of the shell 1 and communicates with the inside of the shell 1 .

[0046] like Figure 1 As shown in FIG, in an embodiment of the present invention, a cylinder 4 is disposed within a housing 1. Cylinder 4 comprises an upper cylinder head 41, a cylinder body, and a lower cylinder head. The upper cylinder head 41 and the lower cylinder head are disposed at the upper and lower ends of the cylinder body, respectively. The upper cylinder head 41, the cylinder body, and the lower cylinder head form an inner cavity of the cylinder. The distance between the cylinder body of cylinder 4 and the housing 1 is L4.

[0047] Cylinder 4 includes an upper cylinder head 41, which is provided with a refrigerant channel. When the compressor is running, the motor is energized to rotate the pump body (primarily the crankshaft piston). A mixture of refrigeration oil and refrigerant is drawn in from the lower portion of the crankshaft and discharged from the upper portion. The mixture then flows through the refrigerant channel in the upper cylinder head 41 and into the oil sump, completing the oil circulation within the compressor.

[0048] Another example Figure 3 and Figure 4 As shown in FIG, a cover plate 5 is further provided in the housing 1. The cover plate 5 is located directly above the opening of the other end 31 of the oil balancing pipe 3 and is large enough to cover the opening of the other end 31 of the oil balancing pipe 3 and effectively prevent the refrigerant from falling from the refrigerant channel and directly entering the opening of the other end 31 of the oil balancing pipe 3.

[0049] like Figure 3 As shown in FIG, the cover plate 5 is located between the refrigerant channel of the upper cylinder cover 41 and the opening of the other end 31 of the oil balancing pipe 3 .

[0050] Furthermore, in an embodiment of the present invention, the upper cylinder head 41 preferably has a plurality of refrigerant channels, and the outlets of the plurality of refrigerant channels avoid the opening of the other end 31 of the oil balancing pipe 3. "Avoid" means that the refrigerant dripping from the outlet of the refrigerant channel does not contact the opening of the other end 31 of the oil balancing pipe 3 and the area near the opening during its fall under the action of gravity, and can be sucked into the opening area through the siphon effect. This can effectively prevent the refrigerant from falling from the refrigerant channel from directly entering the oil balancing pipe 3 due to the siphon effect. For example, the vertical projection of the outlet of the refrigerant channel does not overlap with the vertical projection of the opening of the other end 31 of the oil balancing pipe 3 and the area near the opening.

[0051] In the embodiment of the present invention, the cover plate 5 is preferably arranged on the upper cylinder head 41 to form an upper cylinder head assembly. The cover plate 5 is made of metal or polymer material, such as Figure 3 As shown in , it can be welded or bonded to the upper cylinder cover 41, and as shown in Figure 4 and Figure 5 As shown in , the appearance can be plate-shaped, bent plate-shaped or other shapes, welded or bonded to the upper cylinder cover 41.

[0052] like Figure 2 、 Figure 6 and Figure 7 As shown in FIG, in the embodiment of the present invention, the other end 31 of the oil balancing pipe 3 includes an external pipe 32 , an extending end 33 and a seat ring 34 .

[0053] like Figure 2 As shown in FIG, the external tube 32 is connected to the insertion end 33.

[0054] like Figure 6 As shown in FIG, the external tube 32 is located outside the housing 1, and the insertion end 33 and the seat ring 34 are located inside the housing 1. The insertion end 33 is inserted into the housing 1 and does not directly contact the inner wall of the housing 1, which can prevent the refrigerant and oil on the inner wall from being discharged through the siphon effect, thereby increasing the oil yield.

[0055] Combined with Figure 7 As shown in FIG, the seat ring 34 is sleeved on the insertion end 33. The length L1 of the seat ring 34 is greater than the length L2 of the insertion end 33 and less than the length L4, thereby effectively preventing the refrigerant from falling from the refrigerant channel and directly entering the oil balancing pipe 3. Preferably, the seat ring 34 is fixed to the insertion end 33 by threads.

[0056] like Figure 7 As shown in FIG, in an embodiment of the present invention, the aperture of the opening of the seat ring 34 is larger than the aperture of the opening of the insertion end 33 and is flared / conical or other shapes.

[0057] An oil balancing pipe structure for a rotor-type compressor and the compressor thereof according to an embodiment of the present invention have the advantages of reducing the oil yield and improving the performance of the compressor.

[0058] Combined with Figure 8 As shown in FIG, the seat ring 34 is preferably further connected in sequence to a pressure-welded section 35 and an external section 36. The seat ring 34 and the pressure-welded section 35 engage the main housing 1 to secure the seat ring 34. The seat ring 34, pressure-welded section 35, and external section 36 may be integrally formed or separately assembled, preferably by threads or other means, and may be made of copper, other metals, or other polymer materials.

[0059] like Figure 7 As shown in FIG, in an embodiment of the present invention, preferably, the seat ring 34 is further provided with an opening 37 to allow the oil to fall into the oil pool. Preferably, the opening 37 is not located directly below the opening of the insertion end 33, and the opening 37 is circular or elongated to reduce the risk of OCR increase.

[0060] The present invention is described below with specific embodiments:

[0061] Example 1

[0062] like Figure 1 As shown in the figure, an oil balancing pipe structure for a rotary compressor and the compressor thereof include a shell 1, an exhaust pipe 2 and an oil balancing pipe 3. One end of the oil balancing pipe 3 is connected to the exhaust pipe 2, and the other end 31 of the oil balancing pipe 3 passes through the side of the shell 1 and communicates with the inside of the shell 1.

[0063] A cylinder 4 is provided in the housing 1. A distance L4 is defined between the cylinder 4 and the housing 1. The cylinder 4 includes an upper cylinder cover 41, which is provided with a refrigerant passage.

[0064] like Figure 3 As shown in FIG, a cover plate 5 is also provided within the housing 1. The cover plate 5 is a bent plate made of metal. The cover plate 5 is located directly above the opening at the other end 31 of the oil balancing pipe 3 and is welded to the bottom surface of the upper cylinder head 41. This effectively prevents refrigerant from falling through the refrigerant passages and directly entering the oil balancing pipe 3.

[0065] like Figure 7 As shown in FIG, the other end 31 of the oil balancing pipe 3 includes an external pipe 32 , an extending end 33 and a seat ring 34 .

[0066] The external tube 32 is located outside the housing 1, while the insertion end 33 and the seat ring 34 are located inside the housing 1. The seat ring 34 is threaded onto the insertion end 33. The length of the seat ring 34 is greater than the length of the insertion end 33 and less than L4, which can also effectively prevent the refrigerant from falling from the refrigerant channel and directly entering the oil balancing pipe 3.

[0067] Comparative Example 1

[0068] In the existing compressor, the oil balancing pipe is connected to the inner wall of the shell, and the refrigerant channel of the upper cylinder cover is located above the opening of the oil balancing pipe.

[0069] The compressor of Example 1 of the present invention and the compressor of Comparative Example 1 were tested and compared at 3600 rpm (rotational speed per minute), 4800 rpm, and 5400 rpm, respectively. The measured OCRs are shown in Table 1 below:

[0070] Table 1: OCR of Control Example 1 and Example 1 at 3600 rpm, 4800 rpm, and 5400 rpm

[0071] 3600rpm 4800rpm 5400rpm Comparative Example 1 2.94％ 3.19％ 4.36％ Example 1 0.80％ 1.69％ 1.14％ reduce 2.14％ 1.50％ 3.22％

[0072] As can be seen from the data in the above figure, after using the embodiment of the present invention, the OCR is reduced by 1.50%-3.22% compared with the previous technical solution, which reduces the OCR of the compressor and makes the oil yield close to 1%.

[0073] In summary, the oil equalizing pipe structure for a rotary compressor according to the embodiment of the present invention has the advantages of reducing the oil yield and improving the performance of the compressor.

[0074] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An oil equalizing pipe structure for a rotary compressor, suitable for a rotary compressor, characterized in that: The rotary compressor comprises a shell (1), an exhaust pipe (2) and an oil equalizing pipe (3) are provided outside the shell (1), the exhaust pipe (2) is provided at the top end of the shell (1), one end of the oil equalizing pipe (3) is connected to the exhaust pipe (2), the other end (31) of the oil equalizing pipe (3) passes through the side of the shell (1) and communicates with the inside of the shell (1), the other end (31) of the oil equalizing pipe (3) comprises an external pipe (32), an insertion end (33) and a seat ring (34), the external pipe (32) and the insertion end (33) are connected, the external pipe (32) is located outside the shell (1), the insertion end (33) is located inside the shell (1), the seat ring (34) is sleeved on the insertion end (33), the length of the seat ring (34) is greater than the length of the insertion end (33), and the aperture of the opening of the seat ring (34) is greater than the aperture of the opening of the insertion end (33).

2. The oil equalizing pipe structure for a rotary compressor according to claim 1, characterized in that: The seat ring (34) is fixed to the insertion end (33) via threads.

3. The oil equalizing pipe structure for a rotary compressor according to claim 1, characterized in that: The seat ring (34) is also provided with an opening (37).

4. The oil equalizing pipe structure for a rotary compressor according to claim 1, characterized in that: A cylinder (4) is provided in the shell (1), and the cylinder (4) includes an upper cylinder cover (41). A refrigerant channel is provided on the upper cylinder cover (41), and an outlet of the refrigerant channel avoids the opening of the other end (31) of the oil balancing pipe (3).

5. The oil equalizing pipe structure for a rotary compressor according to claim 1, characterized in that: A cylinder (4) is provided in the shell (1), and the cylinder (4) includes an upper cylinder cover (41). A refrigerant channel is provided on the upper cylinder cover (41). A cover plate (5) is also provided in the shell (1), and the cover plate (5) is located directly above the opening of the other end (31) of the oil balancing pipe (3).

6. The oil equalizing pipe structure for a rotary compressor according to claim 5, characterized in that: The cover plate (5) is located between the refrigerant channel of the upper cylinder cover (41) and the opening of the other end (31) of the oil balancing pipe (3).

7. The oil equalizing pipe structure for a rotary compressor according to claim 5, characterized in that: The cover plate (5) is in the shape of a plate.

8. The oil equalizing pipe structure for a rotary compressor according to claim 5, characterized in that: The cover plate (5) is welded or bonded to the bottom surface of the upper cylinder cover (41).

9. A compressor, characterized in that: It comprises the oil equalizing pipe structure for a rotary compressor according to any one of claims 1 to 8.

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