Upper cylinder head structure for a rotary compressor and compressor

Abstract

The application provides a rotor compressor upper cylinder cover structure and a compressor. The rotor compressor upper cylinder cover structure comprises a shell, an exhaust pipe and an oil equalizing pipe. The exhaust pipe is arranged at the top end of the shell. One end of the oil equalizing pipe is connected with the exhaust pipe. The other end of the oil equalizing pipe penetrates through the side surface of the shell and is communicated with the shell. A cylinder is arranged in the shell. The cylinder comprises an upper cylinder cover. A refrigerant passage is arranged on the upper cylinder cover. The outlet of the refrigerant passage is away from the opening of the other end of the oil equalizing pipe or a cover plate is arranged above the opening of the other end of the oil equalizing pipe in the shell. The application has the advantages of reducing the oil discharge rate and improving the performance of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor, in particular, to an upper cylinder cover structure for a rotary compressor. BACKGROUND

[0002] The motor of the rotary compressor does not need to convert the rotary motion of the rotor into the reciprocating motion of the piston, but directly drives the rotary piston to rotate to complete the compression of the refrigerant vapor. Such compressor is more suitable for small air conditioners, especially for the application in household air conditioners. The rotary compressor has the advantages of less parts, simple structure, less easy-to-damage parts, and reliable operation.

[0003] The multi-split central air conditioner is a type of user central air conditioner, commonly known as "one drags many", which refers to a once refrigerant air conditioning system that connects two or more indoor units through piping from an outdoor unit, and uses air-cooled heat exchange form on the outdoor side and direct evaporation heat exchange form on the indoor side. The multi-split system is increasingly widely used in small and medium-sized buildings and some public buildings.

[0004] Compared with the traditional central air conditioning system, the multi-split central air conditioner has the following characteristics: energy saving, low operating cost; advanced control, reliable operation; good adaptability of the unit, wide temperature range of refrigeration and heating; high design freedom, easy installation and billing. Compared with traditional air conditioners, the multi-split air conditioner has the following advantages: it uses a new concept, integrates one-to-many technology, intelligent control technology, multiple health technologies, energy-saving technologies and network control technologies, and meets the requirements of consumers for comfort and convenience.

[0005] Energy saving and environmental protection are the two major themes of the refrigeration and air conditioning industry. In view of the gradual increase of energy saving requirements, the energy efficiency level of air conditioners is also further improved. The existing oil equalizing pipe is connected to the exhaust pipe at one end and to the compressor housing at the other end, and is located below the refrigerant passage. When the oil and refrigerant in the compressor housing circulate, due to the possible pressure difference, the oil and refrigerant that drips near the oil equalizing pipe port can be easily discharged from the exhaust pipe through the oil equalizing pipe, thereby increasing the oil discharge rate of the compressor and affecting the performance of the compressor.

[0006] Therefore, the person skilled in the art is committed to developing an upper cylinder cover structure and a compressor thereof for reducing the oil discharge rate and improving the performance of the compressor. SUMMARY

[0007] In view of the problems in the prior art, the purpose of the present application is to provide an upper cylinder cover structure for a rotary compressor and a compressor thereof, so that the oil discharge rate of the rotary multi-split compressor is close to 1%, and the stability of the performance test of the compressor is improved.

[0008] According to an aspect of the present application, there is provided an upper cylinder head structure for a rotary compressor, which is applicable to a rotary compressor, the rotary compressor comprising a housing, an exhaust pipe and an oil equalizing pipe, the exhaust pipe being arranged at a top end of the housing, one end of the oil equalizing pipe being connected to the exhaust pipe, the other end of the oil equalizing pipe penetrating a side surface of the housing and being in communication with the inside of the housing, the housing being provided with a cylinder, the cylinder comprising an upper cylinder head, the upper cylinder head being provided with a refrigerant passage, the housing further being provided with a cover plate, the cover plate being located directly above an opening of the other end of the oil equalizing pipe.

[0009] Preferably, the cover plate is located directly below the refrigerant passage of the upper cylinder head, and the cover plate is located between the refrigerant passage of the upper cylinder head and the opening of the other end of the oil equalizing pipe.

[0010] Preferably, the cover plate is in the shape of a plate or a bent plate.

[0011] Preferably, the cover plate is arranged on a bottom surface of the upper cylinder head.

[0012] Preferably, the cover plate is welded or adhered to the bottom surface of the upper cylinder head.

[0013] Preferably, the cover plate is made of metal or a polymer material.

[0014] Preferably, the other end of the oil equalizing pipe comprises an external pipe, an insertion end and a seat ring, the external pipe and the insertion end being connected, the external pipe being located outside the housing, the insertion end being located inside the housing, the seat ring being sleeved on the insertion end, and the length of the seat ring being greater than the length of the insertion end.

[0015] Preferably, the seat ring has a larger hole diameter than the insertion end.

[0016] Preferably, the seat ring is fixed to the insertion end by screwing.

[0017] According to another aspect of the present application, there is provided an upper cylinder head structure for a rotary compressor, which is applicable to a rotary compressor, the rotary compressor comprising a housing, an exhaust pipe and an oil equalizing pipe, the exhaust pipe being arranged at a top end of the housing, one end of the oil equalizing pipe being connected to the exhaust pipe, the other end of the oil equalizing pipe penetrating a side surface of the housing and being in communication with the inside of the housing, the housing being provided with a cylinder, the cylinder comprising an upper cylinder head, the upper cylinder head being provided with a refrigerant passage, and the outlet of the refrigerant passage of the upper cylinder head avoiding the opening of the other end of the oil equalizing pipe.

[0018] According to another aspect of the present application, there is provided a compressor comprising the upper cylinder head structure for a rotary compressor as described above.

[0019] The upper cylinder cover structure of a rotor compressor and the compressor can effectively prevent refrigerant from falling from the refrigerant self-channel directly into the oil equalizing pipe opening, and have the advantages of reducing oil discharge rate and improving compressor performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, read in conjunction with the accompanying drawings.

[0021] Figure 1 is a structural schematic diagram of a rotor compressor of an embodiment of the application;

[0022] Figure 2 is a structural schematic diagram of an oil equalizing pipe of a rotor compressor of an embodiment of the application;

[0023] Figure 3 is a structural schematic diagram of an upper cylinder cover assembly of a rotor compressor of an embodiment of the application;

[0024] Figure 4 is a structural schematic diagram of a cover plate of a rotor compressor of an embodiment of the application;

[0025] Figure 5 is a structural schematic diagram of a bent cover plate of a rotor compressor of an embodiment of the application;

[0026] Figure 6 is a structural schematic diagram of an oil equalizing pipe and a shell of a rotor compressor of an embodiment of the application;

[0027] Figure 7 is a structural schematic diagram of another end of an oil equalizing pipe of a rotor compressor of an embodiment of the application;

[0028] Figure 8 is a structural schematic diagram of a seat ring of an oil equalizing pipe of a rotor compressor of an embodiment of the application.

[0029] REFERENCE NUMERALS

[0030] 1 shell

[0031] 2 exhaust pipe

[0032] 3 oil equalizing pipe

[0033] 31 another end of the oil equalizing pipe

[0034] 32 external pipe

[0035] 33 insertion end

[0036] 34 seat ring

[0037] 35 pressure welding section

[0038] 36 External segments

[0039] 37 Opening

[0040] 4 cylinders

[0041] 41 Upper cylinder head Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary 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 the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0043] like Figure 1 As shown in the embodiments of the present invention, an upper cylinder head structure and compressor for a rotary compressor are provided, preferably a multi-unit system composed of twin-rotor compressors.

[0044] The rotary compressor includes a housing 1, and an exhaust pipe 2 and an oil distribution pipe 3 are provided outside the housing 1.

[0045] The exhaust pipe 2 is located at the top of the housing 1. Preferably, the exhaust pipe 2 is a flared type, i.e., as shown in the image. Figure 1 The upper opening shown has a larger diameter than the lower opening, which reduces the compressor's oil circulation rate (OCR).

[0046] and combined with, for example Figure 2 As shown, one end of the oil equalization pipe 3 is connected to the exhaust pipe 2, and the other end 31 of the oil equalization pipe 3 passes through the side of the housing 1 and communicates with the inside of the housing 1.

[0047] like Figure 1 As shown in the embodiment of the present invention, a cylinder 4 is provided inside the housing 1. The cylinder 4 includes an upper cylinder cover 41, a cylinder body, and a lower cylinder cover. The upper cylinder cover 41 and the lower cylinder cover are respectively located at the upper and lower ends of the cylinder body, and the upper cylinder cover 41, the cylinder body, and the lower cylinder cover form the inner cavity of the cylinder. The distance between the cylinder body of the cylinder 4 and the housing 1 is L4.

[0048] Cylinder 4 includes an upper cylinder head 41, on which a refrigerant passage is provided. When the compressor is running, the motor is energized to drive the pump body to rotate (mainly the crankshaft piston rotates). The mixture of refrigeration oil and refrigerant is drawn in from the lower part of the crankshaft and discharged from the upper part of the crankshaft. The mixture falls into the oil sump from the refrigerant passage of the upper cylinder head 41, completing the oil circulation inside the compressor.

[0049] For example Figure 3 and Figure 4As shown, a cover plate 5 is also provided inside the housing 1. The cover plate 5 is located directly above the opening of the other end 31 of the oil equalization pipe 3, and is large enough to block the opening of the other end 31 of the oil equalization pipe 3, and can effectively prevent the refrigerant from falling from the refrigerant passage and directly entering the opening of the other end 31 of the oil equalization pipe 3.

[0050] like Figure 3 As shown, the cover plate 5 is located between the refrigerant passage of the upper cylinder head 41 and the opening at the other end 31 of the oil distribution pipe 3.

[0051] Furthermore, in another embodiment of the present invention, the upper cylinder head 41 preferably has several refrigerant channels, and the outlets of these refrigerant channels avoid the opening at the other end 31 of the oil equalization pipe 3. "Avoid" means that the refrigerant dripping from the outlet of the refrigerant channel does not contact the opening at the other end 31 of the oil equalization pipe 3 or the area near the opening during its descent under gravity. This prevents the refrigerant from directly entering the oil equalization pipe 3 due to the siphon effect, effectively preventing the refrigerant from falling from the refrigerant channel into the oil equalization pipe 3. For example, the vertical projection of the refrigerant channel outlet does not coincide with the vertical projection of the opening at the other end 31 of the oil equalization pipe 3 or the area near the opening.

[0052] In embodiments of the present invention, the cover plate 5 is preferably disposed on the upper cylinder head 41, forming an upper cylinder head assembly. The cover plate 5 is made of metal or polymer material, such as... Figure 3 As shown, it can be welded or glued to the upper cylinder head 41, or as... Figure 4 and Figure 5 As shown, the appearance can be plate-shaped, bent plate-shaped, or other shapes, and it is welded or bonded to the upper cylinder head 41.

[0053] like Figure 2 , Figure 6 and Figure 7 As shown in the embodiment of the present invention, the other end 31 of the oil distribution pipe 3 includes an external pipe 32, an extension end 33, and a seat ring 34.

[0054] like Figure 2 As shown, the external tube 32 and the insertion end 33 are connected.

[0055] like Figure 6 As shown, the external tube 32 is located outside the housing 1, while the extension end 33 and the seat ring 34 are located inside the housing 1. The extension end 33 extends into the housing 1 but does not directly contact the inner wall of the housing 1, which can prevent the refrigerant and engine oil on the inner wall from being discharged through the siphon effect, thus increasing the oil output rate.

[0056] and combined with, for example Figure 7 As shown, the seat ring 34 is fitted onto the extension end 33. The length L1 of the seat ring 34 is greater than the length L2 of the extension end 33 but less than L4, which effectively prevents the refrigerant from falling directly into the oil distribution pipe 3 from the refrigerant passage. Preferably, the seat ring 34 is fixed to the extension end 33 by threads.

[0057] As Figure 7 shown in the embodiment of the present application, the seat ring 34 is flared or tapered in shape, with the opening of the seat ring 34 having a larger diameter than the opening of the insertion end 33.

[0058] The upper cylinder head structure for a rotary compressor and the compressor of the embodiment of the present application have the advantages of reducing oil discharge rate and improving compressor performance.

[0059] In combination with Figure 8 shown in the embodiment of the present application, the seat ring 34 is further connected with a pressure welding section 35 and an external section 36 in sequence. The seat ring 34 and the pressure welding section 35 clamp the housing 1, and the seat ring 34 is fixedly installed. The seat ring 34, the pressure welding section 35 and the external section 36 are integrally formed or separately installed, preferably by screwing or other means, and the material can be copper or other metal and other polymer materials.

[0060] As Figure 7 shown in the embodiment of the present application, the seat ring 34 is further provided with an opening 37 for oil to fall into the oil pool. The opening 37 is preferably not arranged directly below the opening of the insertion end 33, and the opening 37 is circular or strip-shaped, which can reduce the risk of OCR rising.

[0061] The present application will be described in detail below with specific embodiments:

[0062] Embodiment 1

[0063] As Figure 1 shown in the embodiment of the present application, the upper cylinder head structure for a rotary compressor and the compressor thereof include a housing 1, an exhaust pipe 2 and an oil equalizing pipe 3. One end of the oil equalizing pipe 3 is connected with the exhaust pipe 2, and the other end 31 of the oil equalizing pipe 3 penetrates through the side of the housing 1 and communicates with the inside of the housing 1.

[0064] The housing 1 is provided with a cylinder 4. The distance between the cylinder 4 and the housing 1 is L4. The cylinder 4 includes an upper cylinder head 41, and the upper cylinder head 41 is provided with a refrigerant passage.

[0065] As Figure 3 shown in the embodiment of the present application, the housing 1 is further provided with a cover plate 5. The cover plate 5 is in the shape of a bent plate and is made of metal. The cover plate 5 is located directly above the opening of the other end 31 of the oil equalizing pipe 3 and is welded to the bottom surface of the upper cylinder head 41, which can effectively prevent the refrigerant from falling from the refrigerant passage and directly entering the oil equalizing pipe 3.

[0066] As Figure 7 shown in the embodiment of the present application, the other end 31 of the oil equalizing pipe 3 includes an external pipe 32, an insertion end 33 and a seat ring 34.

[0067] The outer tube 32 is located outside the shell 1, the extending end 33 and the seat ring 34 are located inside the shell 1. The seat ring 34 is sleeved on the extending end 33 through threads, the length of the seat ring 34 is greater than the length of the extending end 33 and less than L4, which can effectively prevent the refrigerant from falling from the refrigerant channel directly into the oil equalizing pipe 3.

[0068] Comparative Example 1

[0069] The existing compressor has an oil equalizing pipe connected with the inner wall of the shell, and the refrigerant channel of the upper cylinder cover is located above the opening of the oil equalizing pipe.

[0070] The compressor of the present application embodiment 1 and the compressor in comparative example 1 are respectively tested at 3600 rpm (revolutions per minute), 4800 rpm, 5400 rpm, and the OCR is measured as shown in Table 1 below:

[0071] Table 1: OCR of comparative example 1 and embodiment 1 at 3600 rpm, 4800 rpm, 5400 rpm

[0072] 3600 rpm 4800 rpm 5400 rpm Comparative Example 1 2.94％ 3.19％ 4.36％ Example 1 0.80％ 1.69％ 1.14％ Decrease 2.14％ 1.50％ 3.22％

[0073] From the above table data, after using the embodiment of the present application, 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 discharge rate close to 1%.

[0074] In summary, the rotor type compressor upper cylinder cover structure of the embodiment of the present application has the advantages of reducing the oil discharge rate and improving the performance of the compressor.

[0075] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. An upper cylinder head structure for a rotary compressor, which is adapted to a rotary compressor, characterized in that, The rotor compressor comprises a shell (1), an exhaust pipe (2) and an oil equalizing pipe (3) are arranged outside the shell (1), the exhaust pipe (2) is arranged at the top end of the shell (1), one end of the oil equalizing pipe (3) is connected with the exhaust pipe (2), the other end (31) of the oil equalizing pipe (3) penetrates through the side of the shell (1) and communicates with the inside of the shell (1), a cylinder (4) is arranged in the shell (1), the cylinder comprises an upper cylinder cover (41), the upper cylinder cover (41) is provided with a refrigerant passage, a cover plate (5) is further arranged in the shell (1), the cover plate (5) is located directly above the opening of the other end (31) of the oil equalizing pipe (3) and covers the opening of the other end (31) of the oil equalizing pipe (3) to prevent the refrigerant in the refrigerant passage from falling into the opening of the other end (31) of the oil equalizing pipe (3); the cover plate (5) is located directly below the refrigerant passage of the upper cylinder cover (41) and is located between the refrigerant passage of the upper cylinder cover (41) and the opening of the other end (31) of the oil equalizing pipe (3); the cover plate (5) is in the shape of a plate; the cover plate (5) is arranged on the bottom surface of the upper cylinder cover (41); the other end (31) of the oil equalizing pipe (3) comprises an external pipe (32), an inserted end (33) and a seat ring (34), the external pipe (32) is connected with the inserted end (33), the external pipe (32) is located outside the shell (1), the inserted end (33) is located inside the shell (1), the seat ring (34) is sleeved on the inserted end (33), and the length of the seat ring (34) is greater than the length of the inserted end (33).

2. The upper cylinder head structure for a rotary compressor according to claim 1, characterized in that: The cover plate (5) is welded or adhered on the bottom surface of the upper cylinder cover (41).

3. The upper cylinder head structure for a rotary compressor according to claim 1, characterized in that: The cover plate (5) is made of metal or high polymer material.

4. The upper cylinder head structure for a rotary compressor according to claim 1, characterized in that: The aperture of the opening of the seat ring (34) is greater than the aperture of the opening of the inserted end (33).

5. A compressor characterized by: The rotor compressor upper cylinder cover structure comprises the rotor compressor upper cylinder cover structure according to any one of claims 1 to 4.

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