A sealing structure and sealing method for a refrigeration rotary compressor

Abstract

The present invention discloses a sealing structure and a sealing method for a refrigeration rotary compressor. By providing oil grooves on the rotor sealing end face and / or the slider sealing end face, a small amount of oil liquid is contained in the oil grooves. This sealing structure can form small air cavities in the sealing belts between the upper cylinder head of the rotary compressor and the high and low pressure cavities of the rotor or (and) the slider end face, and in the sealing belts between the lower cylinder head of the rotary compressor and the high and low pressure cavities of the rotor or (and) the slider end face. The small air cavities play a buffering and sealing role during the flow of high-pressure gas to the low-pressure cavity, and at the same time can hold a small amount of oil to replenish the oil film on the high and low pressure sealing surfaces back and forth. The oil film plays a sealing role in the gap of the sealing surface. Even under the blowing action of the high-pressure end gas, the oil film can move back and forth on both sides of the oil groove, and always form an oil film on the sealing end face, reducing the leakage of high-pressure end gas to the low-pressure end, ensuring the gas delivery volume of the compressor, and reducing the power consumption of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary compressors, and particularly relates to a sealing structure and a sealing method for a refrigeration rotary compressor. Background Art

[0002] In the refrigeration industry, the rotary compressor is a commonly used structure that is widely applied, with high performance, simple structure, and low cost. Especially in the air-conditioning industry, it has a high cost performance. The common structures of rotary compressors include rolling rotary type and swinging rotary type; as shown in the attached Figure 1 and Figure 2 figures, a swinging rotary compressor is shown. One side of the rotor is the air inlet (low-pressure end), and the other end has an air outlet (high-pressure end). There will be a small gap between the rotor end face and the end cover, and there is an oil film in the gap, forming an oil film sealing surface.

[0003] In the existing rotor sealing structure, there is a small gap between the rotor end face and the end cover. Affected by the high and low gas pressure difference, a small amount of high-pressure gas leaks to the low-pressure end, and the high-pressure gas is likely to blow away the oil film, further increasing the leakage amount, reducing the air delivery volume of the compressor, and increasing the power consumption.

[0004] There is also a form of setting sealing rings or seals to form a sealing structure. For example, the Chinese Utility Model Patent (Publication No.: CN2528972) disclosed a cylinder assembly with a sealing piston in 2003. A sealing groove is provided on one end face of the integrated piston, and a sealing ring is placed in the sealing groove; the setting of the sealing ring improves the sealing effect between the integrated piston and the upper and lower cylinder covers. However, the sealing ring is a consumable item, easy to wear and damage, and often needs to be replaced. Moreover, the setting of the sealing ring increases the frictional resistance of the end face, increases the power consumption, and affects the swinging efficiency.

[0005] Another example is the Chinese Utility Model Patent (Publication No.: CN207145234U) which disclosed a swinging rotary compressor with an end face sealing structure in 2018. An end face sealing groove is opened on the sealing end face, the end face sealing cover is closely attached to the sealing end face, and an end face seal is also provided between the end face sealing cover and the sealing end face; the setting of this seal improves the airtight stability, but the structure is complex, and multiple auxiliary accessories are required, increasing the difficulty of assembly and processing.

[0006] Moreover, due to the setting methods of the components in the above two structures, they cannot be applied to rolling rotary compressors, and the applicable range is limited. Summary of the Invention

[0007] The object of the present invention is to provide a sealing structure and a sealing method for a refrigeration rotary compressor in view of the problems existing in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A sealing structure for a refrigeration rotary compressor, the sealing structure includes an oil groove provided on the rotor sealing end face and / or the slider sealing end face, a small air cavity is formed at the oil groove, and the oil groove holds an oil film on the rotor sealing end face and / or the slider sealing end face.

[0010] By providing an oil groove on the sealing end face between the rotor and the upper (lower) end cover, this sealing structure can hold the oil film and form a good oil seal. Even under the blowing action of high-pressure gas, the oil film can be automatically replenished, and an oil film is always formed on the sealing end face, reducing the leakage of high-pressure end gas to the low-pressure end, ensuring the gas volume of the compressor, and reducing the power consumption of the compressor.

[0011] Specifically, through the setting of the oil groove, this sealing structure can form a small air cavity within the sealing belt between the upper cylinder head of the rotary compressor and the high and low pressure chambers of the rotor or slider end face, and within the sealing belt between the lower cylinder head of the rotary compressor and the high and low pressure chambers of the rotor or slider end face. The small air cavity plays a buffering and sealing role during the flow of high-pressure gas to the low-pressure cavity, and at the same time can hold a small amount of oil to replenish the oil film on the high and low pressure sealing surfaces back and forth. The oil film plays a sealing role in the gap of the sealing surface; even under the blowing action of high-pressure end gas, the oil film can move back and forth on both sides of the oil groove, and an oil film is always formed on the sealing end face, reducing the leakage of high-pressure end gas to the low-pressure end, ensuring the gas volume of the compressor, and reducing the power consumption of the compressor; the oil can be brought into the oil groove through the oil film in the movement gap, or the oil can be replenished by an active oil replenishment method.

[0012] This sealing structure has a simple process and does not require the setting of vulnerable sealing rings or complex sealing structures. By continuously forming an oil film, it can reduce internal gas leakage, increase the refrigerating capacity of the compressor, and significantly improve the product performance consistency and efficiency.

[0013] Due to the existence of high and low pressure environments, the oil in the oil groove will slowly and continuously replenish the sealing end face under the action of the pressure difference to form an oil film; the consumption of the oil film during actual operation can be predicted, and the oil can be replenished into the oil groove at regular intervals or during compressor maintenance to maintain a long-term sealing effect.

[0014] On the other hand, the oil groove provided in this sealing structure is equivalent to providing a gas buffer belt on the sealing end face, which makes the high-pressure gas form a buffer when leaking, reducing the leakage amount and rate, and ensuring the gas volume and refrigeration effect.

[0015] Furthermore, the oil groove is one of a "V" - shaped groove, an arc - shaped groove or a rectangular groove, and the depth of the oil groove does not exceed 0.5 mm; the opening angle of the "V" - shaped oil groove is 30 - 150 degrees.

[0016] The depth of the oil groove is relatively small. On the one hand, it can just hold the oil film. On the other hand, it can avoid the excessive depth of the groove affecting the stability of the rotor structure and reduce the machining amount at the same time. The depth of the oil groove takes into account factors such as gas leakage, pressure difference, and the strength of the rotor and slider during setting. The limitation of the opening angle further ensures the effect of forming an oil film with the oil in the oil groove.

[0017] Furthermore, the depth of the oil groove is 0.2 mm, and the opening angle of the oil groove is 60 degrees.

[0018] Furthermore, the slope of the oil groove on the side close to the suction end of the slider sealing end face is smaller than that on the side close to the exhaust end.

[0019] The slopes of the two side walls of the oil groove are set to be different, which can change the tendency of the oil in the oil groove to form an oil film. The slope on the side close to the suction end (i.e., the high-pressure end) is smaller, which is beneficial to forming an oil film this time to offset the oil film blown away by the high-pressure gas.

[0020] Furthermore, an oil storage structure is provided at the bottom of the oil groove. The oil storage structure is a through groove corresponding to and communicating with the oil groove, and the cross-sectional dimension of the through groove is larger than that of the oil groove.

[0021] The oil storage structure can store more oil to continuously supplement the consumed oil film, reduce the frequency of oil replenishment, and extend the service time.

[0022] Adopting the structure of the through groove is convenient for machining and forming on the one hand, and can ensure corresponding connection and communication with each section of the oil groove to form uniform oil supply on the other hand, without causing the situation of oil accumulation in some areas and less oil in some areas.

[0023] Furthermore, the cross-section of the through groove is rectangular, arc-shaped, curved, etc.

[0024] Furthermore, the two sides of the opening of the oil groove are respectively set with arc transitions with the rotor sealing end face or the slider sealing end face.

[0025] The arc transition setting is beneficial to the formation of the oil film, and can also reduce the stress concentration caused by the acute angle at the edge of the oil groove, ensuring the overall strength and mechanical properties of the rotor and the slider.

[0026] Further, the rotor sealing end face and the slider sealing end face are of a split connection structure, and oil grooves are independently arranged on the rotor sealing end face and the slider sealing end face respectively. The oil grooves are an annular oil groove arranged on the rotor sealing end face and a strip-shaped oil groove arranged on the slider sealing end face; an oil hole is arranged at one end of the strip-shaped oil groove on the slider close to the rotor; one end of the oil hole communicates with the strip-shaped oil groove, and the other end extends to the mating surface of the rotor and the slider.

[0027] That is to say, when a rolling rotor is used in a rotary compressor, the rotor and the slider are two independent components, but they are in contact and connected with each other. At this time, the oil grooves can still be used to seal the oil on the rotor sealing end face and the slider sealing end face respectively, without being affected by the split structure, and the sealing effect can still be guaranteed.

[0028] Moreover, small-sized oil holes are arranged on the slider of this type of rolling compressor, so that a small amount of oil in the oil groove enters the contact surface between the slider and the rotor through the oil holes, forming oil lubrication, reducing the frictional resistance and wear between the slider and the rotor, improving the working efficiency of the compressor, and extending the service life of the compressor.

[0029] Preferably, the oil hole is arranged obliquely from the outside to the center. The oblique arrangement is beneficial to the movement of the oil to the middle of the contact surface between the two, forming a better lubrication effect.

[0030] Further, the rotor sealing end face and the slider sealing end face are of an integral structure, and an integrally connected oil groove is arranged on the rotor sealing end face and the slider sealing end face. The oil groove is in a hanging ring shape.

[0031] That is to say, when the rotor used in a rotary compressor is a swinging rotor type, the rotor and the slider are of an integral structure. At this time, the oil groove is also of an integral structure, and an oil groove with the same cross-sectional size is directly machined on the sealing end faces of the rotor and the slider by mechanical processing. The integral oil groove forms a more uniform oil film.

[0032] The oil is lubricating oil, grease-like semi-solid lubricating grease, or sealing liquid such as heat-conducting oil and turbine oil. According to different working environments and the model sizes of the compressors, suitable oil can be selected for sealing and lubrication.

[0033] A sealing method for a refrigeration rotary compressor, the sealing method is to arrange an oil sealing groove on the rotor sealing end face and / or the slider sealing end face of the rotary compressor.

[0034] By adopting the method of oil seal, the setting of accessories is reduced. The use of the oil sump ensures the formation of a continuous oil film, guaranteeing the sealing effect. At the same time, it can lubricate the sealing end face, reduce the frictional resistance and wear between the rotor, the slider and the rotor end cover, avoid the increase of the clearance, and extend the service life of the compressor.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By arranging an oil sump on the sealing end face between the rotor and the rotor end cover, this sealing structure can hold the oil film and form a good oil seal. Even under the blowing action of high-pressure gas, the oil film can be automatically replenished, and an oil film is always formed on the sealing end face, reducing the leakage of high-pressure end gas to the low-pressure end, ensuring the gas volume of the compressor and reducing the power consumption of the compressor; 2. The process of this sealing structure is simple. Without setting vulnerable sealing rings or complex sealing structures, a continuous oil film can be formed, reducing the material cost, and significantly improving the performance consistency and efficiency of the compressor; 3. The oil sump arranged in this sealing structure is equivalent to arranging a gas buffer zone on the sealing end face, enabling the high-pressure gas to form a buffer when leaking, reducing the leakage volume and rate, and ensuring the gas volume and refrigeration effect; 4. The oil seal method of the oil sump is not limited by the type of rotor, and can be applied to both integral structures and split structures, with a wide range of applications; 5. The existence of continuous oil can also lubricate the contact surface and the sealing end face, reduce the frictional resistance and wear between the rotor, the slider and the rotor end cover, avoid the increase of the frictional clearance, and extend the service life of the compressor. Brief Description of the Drawings

[0036] Figure 1 It is an overall schematic diagram of a sealing structure for a refrigeration rotary compressor according to the present invention;

[0037] Figure 2 It is an enlarged schematic diagram of the oil sump of the sealing structure for a refrigeration rotary compressor according to the present invention holding the oil film;

[0038] Figure 3 It is a schematic diagram of the cross-section (A-A) of the oil sump of the sealing structure for a refrigeration rotary compressor according to the present invention;

[0039] Figure 4 It is Figure 1 The enlarged schematic diagram at D in

[0040] Figure 5 It is Figure 4 The cross-section schematic diagram C-C in

[0041] Figure 6 It is another cross-section schematic diagram of the oil sump according to the present invention;

[0042] Figure 7 It is a schematic diagram of the cross-section of the arc-shaped oil sump according to the present invention;

[0043] Figure 8 Cross-sectional schematic diagram of the oil sump and oil storage structure in the present invention;

[0044] Figure 9 Another cross-sectional schematic diagram of the oil sump and oil storage structure in the present invention;

[0045] Figure 10 Overall schematic diagram of another sealing structure for a refrigeration rotary compressor in the present invention;

[0046] Figure 11 is Figure 10 Partial enlarged schematic diagram of the B-B cross-section in

[0047] Figure 12 Working schematic diagram after assembly of a sealing structure for a refrigeration rotary compressor in the present invention;

[0048] Figure 13 Another working schematic diagram after assembly of a sealing structure for a refrigeration rotary compressor in the present invention;

[0049] In the figure: 1. Slide block; 2. Rotor; 3. Slide block sealing end face; 4. Rotor sealing end face; 5. Oil sump; 501. Annular oil sump; 502. Strip-shaped oil sump; 6. Arc transition; 7. Oil storage structure; 8. Oil hole; 9. Cylinder block; 10. Eccentric wheel shaft; 11. Cylindrical guide rail; 12. Suction port; 13. Exhaust port; 14. Small air chamber; 15. Oil film; 16. Upper end cover; 17. Lower end cover; 18. High and low pressure chamber one; 19. High and low pressure chamber two. Detailed implementation manners

[0050] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] Embodiment 1:

[0052] As Figure 1 shown, a sealing structure for a refrigeration rotary compressor, the rotary compressor has an integrally formed rotor 2 and a slide block 1; the slide block 1 and the rotor 2 on the same side respectively have a slide block sealing end face 3 and a rotor sealing end face 4, and the sealing structure is to provide an oil sump 5 in the middle of the slide block sealing end face 3 and the rotor sealing end face 4, the oil sump 5 holds the oil film, and a small amount of oil liquid is contained in the oil sump 5.

[0053] Specific design cases, such as Figure 2As shown in the figure, it is a partial enlarged schematic diagram of the oil sump 5 holding the oil film 15 in a certain state. The rotor 2 forms rotor sealing end faces between the upper end cover 16 and the lower end cover 17 of the compressor. The left and right sides of the rotor 2 are an air suction chamber and an air discharge chamber respectively. During the working process, there is an air pressure difference between the air suction chamber and the air discharge chamber during the air suction and compression processes, forming a high-low pressure chamber one 18 and a high-low pressure chamber two 19. Oil sumps 5 are respectively arranged on the upper and lower end faces of the rotor 2. A small air chamber 14 will be formed in the area where the oil sump 5 is located. An oil film 15 will be formed between the rotor 2 and the upper end cover 16 and the lower end cover 17. Under the action of the oil sump 5 and the small air chamber 14, the oil film 15 will be held. Under the influence of long-term reciprocating motion and high and low pressures, the size and shape of the small air chamber 14 will change accordingly.

[0054] Through the setting of the oil sump 5, this sealing structure can form a sealing belt between the upper cylinder head 16 of the rotary compressor and the rotor 2 or the end face of the slider (see Figure 2 ), and between the lower cylinder head 17 of the rotary compressor and the rotor or the end face of the slider (see Figure 2 ) a small air chamber 14 is formed in the sealing belt between the high and low pressure chambers (18, 19). The small air chamber 14 plays a buffering and sealing role during the process of high-pressure gas flowing to the low-pressure chamber, and at the same time can hold a small amount of oil to replenish the oil film 15 on the high and low pressure sealing surfaces back and forth. The oil film 15 plays a sealing role in the gap of the sealing surface. Even under the blowing action of the high-pressure end gas, the oil film 15 can move back and forth on both sides of the oil sump 5, and always form an oil film 15 on the sealing end face, reducing the leakage of high-pressure end gas to the low-pressure end, ensuring the gas delivery volume of the compressor and reducing the power consumption of the compressor.

[0055] This sealing structure has a simple process and does not require the setting of vulnerable sealing rings or complex sealing structures. By continuously forming an oil film, it can reduce the internal leakage of gas, increase the refrigerating capacity of the compressor, and significantly improve the product performance consistency and efficiency.

[0056] Due to the existence of a high and low pressure environment, the oil liquid in the oil sump 5 will slowly and continuously replenish the sealing end face under the action of the pressure difference to form an oil film. The consumption of the oil film during the actual operation can be predicted. Oil liquid can be replenished to the sealing end face or the oil sump at regular intervals or during compressor maintenance to maintain the long-term sealing effect.

[0057] On the other hand, the oil sump 5 provided in this sealing structure is equivalent to setting a gas buffer belt on the sealing end face, which makes the high-pressure gas form a buffer when leaking, reducing the leakage amount and rate, and ensuring the gas delivery volume and refrigeration effect.

[0058] Furthermore, as shown in Figure 3As shown, the oil groove 5 is a "V"-shaped groove, and the depth of the oil groove 5 does not exceed 0.5 mm; the opening angle of the "V"-shaped oil groove 5 is 60 degrees.

[0059] The depth of the oil groove 5 is relatively small. On the one hand, it can just hold the oil film. On the other hand, it can avoid the excessive groove depth from affecting the stability of the rotor structure and can reduce the processing amount at the same time; the depth of the oil groove 5 is set considering factors such as gas leakage, pressure difference, and the strength of the rotor and slider; the limitation of the opening angle further ensures the effect of forming an oil film in the oil groove.

[0060] As Figure 4 and Figure 5 shown, the oil groove 5 (vertical oil groove) on the slider sealing end face 3 intersects and is tangent to the oil groove 5 (annular oil groove) on the rotor sealing end face 4, but their depths are different. The opening surfaces of the oil grooves 5 are in the same plane, and there is a height difference at the bottom of the oil grooves. The depth of the vertical oil groove on the slider sealing end face 3 is slightly less than the depth of the annular oil groove on the rotor sealing end face 4 because the area of the rotor affected by high-pressure gas is larger. Such a setting is beneficial to the formation of an oil film on the rotor sealing end face.

[0061] Furthermore, the two sides of the opening of the oil groove 5 are respectively provided with an arc transition with the rotor sealing end face or the slider sealing end face.

[0062] The setting of the arc transition 6 is beneficial to the formation of an oil film and can also reduce the stress concentration caused by the acute angle at the edge of the oil groove, ensuring the overall strength and mechanical properties of the rotor and the slider.

[0063] Embodiment 2:

[0064] The difference between this embodiment and Embodiment 1 lies in the different shape settings of the oil groove.

[0065] Specifically, as Figure 6 shown, the slope of the oil groove 5 on the slider sealing end face 3 near the suction end is smaller than the slope near the exhaust end.

[0066] The slopes of the two side walls of the oil groove 5 are set differently, which can change the tendency of the oil liquid in the oil groove 5 to form an oil film. The slope near the suction end (i.e., the high-pressure end) is smaller, which is beneficial to forming an oil film this time to offset the oil film blown away by the high-pressure gas.

[0067] As Figure 7 shown, the oil groove 5 is an arc-shaped structure. There are no sharp corners and acute angles in the arc-shaped oil groove 5. During the long-term reciprocating motion, the phenomenon of stress concentration is less, which is more beneficial to maintaining the structural stability of the rotor and the slider.

[0068] Embodiment 3:

[0069] The difference between this embodiment and the first embodiment is that an oil storage structure is provided.

[0070] Specifically, as Figure 8 shown, a storage structure 7 is further provided at the bottom of the oil sump 5; the storage structure 7 is a through groove corresponding to and communicating with the oil sump 5, and the through groove is circular.

[0071] The storage structure 7 can store more oil to continuously supplement the worn oil film, reduce the frequency of oil replenishment, and extend the service time;

[0072] Adopting the structure of the through groove can, on the one hand, be processed and formed, and on the other hand, ensure correspondence and communication with each section of the oil sump, forming uniform oil supply and preventing the situation of oil accumulation in some areas and less oil in some areas.

[0073] Embodiment Four:

[0074] The difference between this embodiment and the first embodiment is that another oil storage structure is provided.

[0075] Specifically, as Figure 9 shown, a storage structure 7 is further provided at the bottom of the oil sump 5; the storage structure 7 is a through groove corresponding to and communicating with the oil sump 5, the through groove is rectangular; the cross-sectional dimension of the through groove is larger than the cross-sectional dimension of the oil sump. Adopting the form of a rectangular through groove can accommodate more oil, and at the same time, it is equivalent to increasing the stroke and area of the gas buffer zone.

[0076] Embodiment Five:

[0077] As Figure 10 and 11 shown, the rotor sealing end face 4 and the slider sealing end face 3 are of a split connection structure, and the oil grooves are independently arranged on the rotor sealing end face 4 and the slider sealing end face 3 respectively. The oil grooves are an annular oil groove 501 arranged on the rotor sealing end face 4 and a strip-shaped oil groove 502 arranged on the slider sealing end face 3 respectively; an oil hole 8 is further provided at one end of the strip-shaped oil groove 502 on the slider close to the rotor 2; one end of the oil hole 8 communicates with the strip-shaped oil groove 502, and the other end extends to the mating surface of the rotor 2 and the slider 1.

[0078] That is to say, when a rolling rotor is used in a rotary compressor, the rotor and the slider are two independent components but are in contact and connected to each other. At this time, the oil grooves can still be used to seal the oil on the rotor sealing end face and the slider sealing end face respectively, without being affected by the split structure, and the sealing effect can still be guaranteed.

[0079] Moreover, a small-sized oil hole 8 is provided on the slider of this type of rolling compressor, so that a small amount of oil in the strip-shaped oil groove 502 enters the contact surface between the slider 1 and the rotor 2 through the oil hole 8, forming oil lubrication, reducing the frictional resistance and wear between the slider 1 and the rotor 2, improving the working efficiency of the compressor, and extending the service life of the compressor.

[0080] Preferably, the oil hole 8 is arranged to incline from the outside to the center. The inclined arrangement is conducive to the movement of the oil towards the middle of the contact surface between the two, forming a better lubrication effect.

[0081] Embodiment Six:

[0082] This embodiment provides a sealing method for a refrigeration rotary compressor and a working mode thereof.

[0083] The sealing method is to provide an oil sealing groove on the rotor sealing end face and / or the slider sealing end face of the rotary compressor.

[0084] By adopting the oil sealing method, the setting of accessories is reduced. The use of the oil groove ensures the formation of a continuous oil film, guaranteeing the sealing effect; at the same time, it can lubricate the sealing end face, reduce the frictional resistance and wear between the rotor and the slider and the rotor end cover, avoid the increase of the gap, and extend the service life of the compressor.

[0085] As Figure 12 shown, it is a swinging rotor structure. The rotor 2 is arranged in the cylinder block 9. An eccentric camshaft 10 is provided in the middle of the rotor 2. One end of the slider 1 is connected to the cylindrical guide rail 11. The air inlet 12 intakes air, and the air outlet 13 exhausts air. There is a pressure difference between area a and area b (according to the intake and exhaust states, area a and area b switch between the high-pressure chamber and the low-pressure chamber); for example, when the compressor is working, area a is in a high-pressure state due to air intake, and the high-pressure air flow formed will leak towards area b on the sealing end faces of the rotor 2 and the slider 1. Due to the existence of the oil groove 5, the oil groove 5 holds (sucks) the oil film, and the oil film on the sealing end face is not easily blown away, and gas will not leak; after long-term operation, even if the oil film is blown away, the oil in the oil groove 5 will timely supplement to form a new oil film, continuously forming a sealing effect, and at the same time lubricating the sealing end face.

[0086] As Figure 13 shown, it is a swinging rotor structure. The rotor 2 is arranged in the cylinder block 9. An eccentric camshaft 10 is provided in the middle of the rotor 2. One end of the slider 1 abuts against a spring and one end abuts against the outer contour of the rotor 2.

[0087] An annular oil groove 501 is provided on the sealing end face of the rotor 2, and a strip-shaped oil groove 502 is provided on the sealing end face of the slider 1; the strip-shaped oil groove 502 is non-through, and it is only necessary to ensure that an oil film can be formed on the sealing end face of the area where the high and low pressure chambers are located.

[0088] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a refrigeration rotary compressor, characterized in that, the sealing structure includes oil grooves provided on the rotor sealing end face and the slider sealing end face, a small air chamber is formed at the oil grooves, and the small air chamber plays a buffering and sealing role during the flow of high-pressure gas to the low-pressure chamber. The oil grooves hold the oil films on the rotor sealing end face and the slider sealing end face; the oil grooves are "V"-shaped grooves, the depth of the oil grooves is 0.2 mm; the opening angle of the oil grooves is 60 degrees; on the slider sealing end face, the slope of the oil groove on the side close to the suction end is smaller than the slope on the side close to the discharge end, and a oil storage structure is further provided at the bottom of the oil groove. The oil storage structure is a through groove corresponding to and communicating with the oil groove, and the cross-sectional dimension of the through groove is larger than the cross-sectional dimension of the oil groove. The cross-section of the through groove is rectangular or arc-shaped; the rotor sealing end face and the slider sealing end face are of a split connection structure, and the oil grooves are independently provided on the rotor sealing end face and the slider sealing end face respectively. The oil grooves are an annular oil groove provided on the rotor sealing end face and a strip-shaped oil groove provided on the slider sealing end face respectively; an oil hole is provided at one end of the strip-shaped oil groove on the slider close to the rotor. One end of the oil hole communicates with the strip-shaped oil groove, and the other end extends to the mating surface of the rotor and the slider; the oil hole is inclined; alternatively, the rotor sealing end face and the slider sealing end face are of an integral structure, and the oil grooves provided on the rotor sealing end face and the slider sealing end face are integrally connected and communicated. The oil grooves are hanging ring-shaped.

2. The sealing structure for a refrigeration rotary compressor according to claim 1, characterized in that, both sides of the opening of the oil groove are provided with arc transitions with the rotor sealing end face and the slider sealing end face respectively.

3. A sealing method for a sealing structure for a refrigeration rotary compressor having the structure according to claim 1, characterized in that, the sealing method is to provide oil grooves on the rotor sealing end face and the slider sealing end face of the rotary compressor.

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