Crankshaft, compressor, oil supply method for compressor, and electrical appliance

Abstract

Relating to the technical field of compressors, the present application discloses a crankshaft, a compressor, an oil supply method for a compressor, and an electrical appliance. The crankshaft includes a long shaft, an eccentric portion, and a short shaft, and an oil pumping mechanism is also provided in the short shaft; an internal oil circuit is formed in the eccentric portion, and an oil outlet of the internal oil circuit is formed outside the eccentric portion, and an oil inlet of the internal oil circuit is connected to the oil pumping mechanism; the external oil groove is connected to the oil outlet of the internal oil circuit, and the oil pumping mechanism supplies oil to the friction pair of the crankshaft through the internal oil circuit and the external oil groove. The present invention places both the internal oil circuit and the external oil groove on the eccentric portion, avoids directly opening oil holes on the long shaft and the short shaft, improves the hollow structure of the traditional crankshaft, reduces the number of oil outlet holes, effectively improves the strength of the crankshaft, reduces the risks of deformation and broken shaft, and improves the reliability of the compressor; the external oil groove on the eccentric portion can supply oil to the long shaft and the short shaft respectively, effectively maintaining the smooth overall oil supply.

Description

Technical Field

[0001] The present application generally relates to a compressor, and more specifically, to a crankshaft, a compressor, an oil supply method for the compressor, and an electrical appliance. Background Art

[0002] A compressor is a driven fluid machine that lifts low-pressure gas to high-pressure gas. It is divided into many types according to its structure, among which the most common is the rolling rotor compressor. The crankshaft becomes the compressor driving component through interference connection with the motor rotor. The crankshaft compresses the refrigerant in the cylinder under the drive of the motor. The compressed refrigerant enters the muffler and then enters the space between the muffler and the motor. The long axis and the short axis are formed on both sides of the eccentric part of the crankshaft. The long axis and the upper flange, the short axis and the lower flange, and the eccentric part and the roller form friction pairs respectively. In order to ensure the reliable operation of the compressor, each friction pair must be fully lubricated and cooled.

[0003] Due to the limitation of the compressor structure, the oil circuit is usually arranged on the crankshaft. The existing oil circuit structure is provided with a central shaft hole along the axial direction of the crankshaft. Since the crankshaft needs to lubricate and cool the components on the upper and lower sides, the central shaft hole is used to transport cooling oil, which generally reaches more than half the length of the crankshaft. The crankshaft is basically a hollow shaft structure. In addition, multiple oil outlet holes are provided according to the requirements of lubrication and oil outlet to ensure sufficient oil outlet for lubrication. The structure of the crankshaft is generally provided with an eccentric part or a balance block. The end faces of the eccentric part and the balance block are assembly surfaces that cooperate with other components. Therefore, the oil outlet hole or oil storage tank is generally provided on the upper and lower sides of the assembly surface of the eccentric part and the balance block to ensure lubrication and cooling efficiency. However, this oil circuit structure has the following defects in use: the crankshaft itself has a long axis and a short axis, and there are usually oil holes at the root of the long axis and the short axis or the assembly surface of the eccentric part and the balance block. At the same time, the crankshaft is a hollow structure, which leads to severe limitation of the strength of the crankshaft, and there is a risk of broken shaft, which reduces the reliability of the crankshaft.

[0004] In view of this, it is urgent to improve the structure of the existing compressor and its oil circuit mechanism to ensure the lubrication and cooling of each friction pair and improve the crankshaft strength. Summary of the invention

[0005] A main purpose of the present application is to overcome the defect of low reliability of the crankshaft of the compressor of the above-mentioned prior art, to improve the strength of the crankshaft of the compressor, and to provide a crankshaft, including a long shaft, an eccentric part and a short shaft, wherein an oil pumping mechanism is also arranged in the short shaft; an internal oil circuit is formed in the eccentric part, an oil outlet of the internal oil circuit is formed outside the eccentric part, and an oil inlet of the internal oil circuit is connected to the oil pumping mechanism; the external oil groove is connected to the oil outlet of the internal oil circuit, and the oil pumping mechanism supplies oil to each friction pair of the crankshaft through the internal oil circuit and the external oil groove.

[0006] According to one embodiment of the present invention, the long axis is a solid axis structure.

[0007] According to an embodiment of the present invention, the outer oil groove is provided on the outer peripheral surface of the eccentric portion, and two ends of the outer oil groove are opened in the directions of the major axis and the minor axis respectively.

[0008] According to an embodiment of the present invention, the depth of the outer oil groove in the middle is greater than the depth of the two sides, and the outlet of the inner oil circuit is opened in the middle of the outer oil groove.

[0009] According to an embodiment of the present invention, the inner oil passage includes a first oil hole and a second oil hole, the first oil hole is connected to the outer oil groove, and the second oil hole is connected to the end surface of the eccentric portion facing the major axis side.

[0010] Further, in the above embodiment, the first oil hole is arranged at the short diameter of the eccentric portion, and the second oil hole is arranged at the long diameter of the eccentric portion.

[0011] Alternatively, further, in the above embodiment, the second oil hole includes a radial hole and an axial hole which are connected in sequence, the radial hole is connected to the oil pumping mechanism, and the opening of the axial hole is arranged on the end face of the eccentric portion.

[0012] According to one embodiment of the present invention, the root of the long shaft forms a first oil storage tank, the root of the short shaft forms a second oil storage tank, and both ends of the outer oil tank are respectively connected to the first oil storage tank and the second oil storage tank.

[0013] The invention also discloses a compressor, comprising a crankshaft with the above structure.

[0014] According to one embodiment of the present invention, it also includes a drive assembly and a pump assembly, and the pump assembly includes:

[0015] The crankshaft is fixed to the rotor of the driving assembly, and the eccentric part and the roller in the cylinder form an eccentric part friction pair;

[0016] The flange assembly includes an upper flange and a lower flange respectively arranged on both sides of the eccentric part, a long shaft friction pair is formed between the upper flange and the long shaft, and a short shaft friction pair is formed between the lower flange and the short shaft. The muffler is sleeved on the shaft neck of the upper flange and pressed against the mounting surface of the upper flange.

[0017] According to one embodiment of the present invention, the upper flange and the root of the long shaft form a first oil storage chamber correspondingly, the lower flange and the root of the short shaft form a second oil storage chamber correspondingly, and the inner wall of the journal is provided with a spiral groove, and the spiral groove is connected to the first oil storage chamber or the external oil groove.

[0018] Further, in the above embodiment, an oil collecting groove is provided on the upper end surface of the upper flange surrounding the journal, and an air outlet is provided on the upper flange, and an inlet of the air outlet is communicated with the first oil storage cavity or the spiral groove;

[0019] The outlet of the gas outlet is arranged in the oil collecting tank, or

[0020] The outlet of the air outlet is arranged on the outer wall of the journal, or

[0021] The air outlet is arranged on the mounting surface.

[0022] Furthermore, in the above embodiment, an oil guide groove is provided on the mounting surface, one end of the oil guide groove is connected to the outlet of the air outlet, and the other end of the oil guide groove leads to the back pressure chamber of the compressor.

[0023] Furthermore, in the above embodiment, the outlet of the oil guide groove is inclined downward along the radial direction of the upper flange, forming an angle of 0 to 5° with the mounting surface.

[0024] Alternatively, further, in the above embodiment, the first oil storage chamber is opened at the root of the outer circumferential surface of the long shaft, or is formed by respectively opening grooves on the outer circumferential surface of the upper flange and the outer wall of the long shaft; the second oil storage chamber is opened at the root of the outer circumferential surface of the short shaft, or is formed by respectively opening grooves on the outer circumferential surface of the lower flange and the outer wall of the short shaft.

[0025] The invention also discloses an electrical appliance, comprising the compressor with the above structure.

[0026] The present invention also discloses a method for supplying oil to a compressor, which is implemented by using the crankshaft of the above structure, and comprises the following steps:

[0027] The oil is pumped at the stub shaft of the crankshaft by a built-in oil pumping mechanism;

[0028] The oil is supplied to the friction pair along the internal oil passage provided in the eccentric part of the crankshaft;

[0029] The outer oil groove outside the eccentric part of the crankshaft is used to supply oil to each friction pair in a balanced manner.

[0030] It can be seen from the above technical scheme that the advantages and positive effects of the present application are: placing the inner oil circuit and the outer oil groove on the eccentric part avoids directly opening oil holes on the major axis and the minor axis. The eccentric part has a larger structural strength due to its larger diameter than the major axis and the minor axis, and has stronger bending and torsion resistance. Therefore, the inner oil circuit and the outer oil groove that need to be opened are both arranged on the eccentric part, which can narrow the strength gap between the sections of the crankshaft and improve the overall strength of the crankshaft; the inner oil circuit is arranged in the eccentric part, which greatly shortens the hollow length inside the crankshaft, enhances the strength of the crankshaft from the inside, makes it less prone to deformation and damage, improves the processing technology, and reduces the processing cost; the present invention improves the hollow structure of the traditional crankshaft, reduces the number of oil outlet holes, effectively improves the strength of the crankshaft, and reduces the risks of deformation and shaft breakage. Moreover, the outer oil groove on the eccentric part can supply oil to the major axis and the minor axis respectively. The eccentric part has a larger outer diameter, so the outer oil groove thereon can supply oil to both sides respectively without worrying about the obstruction of the eccentric part, thereby effectively maintaining the smoothness of the overall oil supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 is a schematic structural diagram of a crankshaft according to an exemplary embodiment.

[0034] Figure 2 is a cross-sectional view of a crankshaft shown according to an exemplary embodiment.

[0035] Figure 3 is a cross-sectional view of a pump body assembly of a compressor shown according to an exemplary embodiment.

[0036] Figure 4 FIG. 4 is a schematic diagram showing the flow of cooling oil of a pump assembly of a compressor according to an exemplary embodiment.

[0037] Figure 5 is a schematic structural diagram of an upper flange of a compressor according to an exemplary embodiment.

[0038] Figure 6 is a cross-sectional view of an upper flange of a compressor shown according to an exemplary embodiment.

[0039] Figure 7is a cross-sectional view of a crankshaft shown according to an exemplary embodiment.

[0040] Figure 8 is a cross-sectional view of a crankshaft shown according to an exemplary embodiment.

[0041] The reference numerals are described as follows:

[0042] Oil pool 100, crankshaft 10, major shaft 11, eccentric part 12, minor shaft 13, central oil hole 21, oil guide plate 22, outer oil groove 30, first oil hole 31, second oil hole 32, radial hole 321, axial hole 322, cylinder 40, roller 41, upper flange 51, mounting surface 510, air outlet hole 511, oil guide groove 512, oil collecting groove 513, journal 514, lower flange 52, first oil storage chamber 61, second oil storage chamber 62, muffler 70, back pressure chamber 80.

[0043] Figure 4 In the figure, the direction of the solid arrow is the flow direction of the cooling oil, and the direction of the dotted arrow is the flow direction of the gaseous oil. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] In order to overcome the problem of low strength of the crankshaft in the prior art, Figure 1 and Figure 2 As shown, the present invention discloses a crankshaft 10, comprising a long shaft 11, an eccentric portion 12 and a short shaft 13, wherein an oil pumping mechanism is also arranged in the short shaft 13; an internal oil circuit is formed in the eccentric portion 12, an oil outlet of the internal oil circuit is formed outside the eccentric portion 12, and an oil inlet of the internal oil circuit is connected to the oil pumping mechanism; an external oil groove 30 is connected to the oil outlet of the internal oil circuit, and the oil pumping mechanism supplies oil to each friction pair of the crankshaft 10 through the internal oil circuit and the external oil groove 30.

[0046] The technical solution of the present invention places both the inner oil circuit and the outer oil groove 30 on the eccentric part 12, avoiding the need to directly open oil holes on the major shaft 11 and the minor shaft 13. The eccentric part 12 has a larger structural strength due to its larger diameter than the major shaft 11 and the minor shaft 13, and has stronger bending and torsion resistance. Therefore, the inner oil circuit and the outer oil groove 30 that need to be opened are both arranged on the eccentric part 12, which can reduce the strength gap between the various sections of the crankshaft 10 and improve the overall strength of the crankshaft 10. Moreover, the inner oil circuit is arranged in the eccentric part 12, which further shortens the hollow length inside the crankshaft 10, strengthens the strength of the crankshaft 10 from the inside, and is not easy to deform or damage. In summary, the present invention improves the hollow structure of the traditional crankshaft 10, reduces the number of oil outlet holes, effectively improves the strength of the crankshaft 10, reduces the risks of deformation and broken shaft, and improves the reliability of the compressor. The solution of the present invention is particularly suitable for small-diameter crankshafts. While achieving low friction power consumption, it ensures that each friction pair is fully lubricated, ensures the strength of the crankshaft 10, and improves the reliability of the compressor.

[0047] Since the outer circumference of the long shaft 11 section is provided with more components such as the muffler 70, the motor, etc., in order to ensure sufficient lubrication and cooling of the components above the crankshaft 10, both the inner oil circuit and the outer oil groove 30 can supply oil to the long shaft 11. Relatively speaking, the oil supply to the short shaft 13 can be adequately supplied through the outer oil groove 30. The setting of the inner oil circuit and the outer oil groove 30 can achieve accurate oil supply, reduce oil waste and ineffective circulation, and reduce energy loss. The outer oil groove 30 on the eccentric part 12 can supply oil to the long shaft and the short shaft respectively. The eccentric part 12 has a larger outer diameter, so the outer oil groove 30 thereon can supply oil to both sides respectively without worrying about the obstruction of the eccentric part 12, effectively maintaining the smooth overall oil supply.

[0048] In the present invention, the crankshaft 10 does not have an oil outlet hole at a position other than the eccentric portion 12, which can reduce the oil discharge rate of the compressor under medium and high frequency operation, avoid causing unstable oil pool liquid level and affecting the reliability of the compressor; on the other hand, it can also prevent excessive refrigerant oil from entering the condenser and evaporator, affecting the heat exchange between the two devices, and ensure the overall performance of electrical appliances such as air conditioners.

[0049] Specifically, Figure 3 and Figure 4 As shown, the oil pumping mechanism includes a central oil hole 21 arranged on the short shaft 13 and an oil guide plate 22 arranged in the central oil hole 21. The oil guide plate 22 is used to utilize its own structure to pump oil from the oil pool 100 into the central oil hole 21 as the crankshaft 10 rotates.

[0050] According to one embodiment of the present invention, the long axis 11 is a solid axis structure. Since the mating surface area of ​​the long axis 11 and other components is larger, its strength has a greater impact on the strength and assembly accuracy of the overall structure. In this embodiment, the long axis 11 is set as a solid axis structure to enhance the strength of the long axis 11 itself and improve the performance and mating accuracy of the overall structure.

[0051] like Figure 2 As shown, according to one embodiment of the present invention, the outer oil groove 30 is arranged on the outer peripheral surface of the eccentric part 12, and the two ends of the outer oil groove 30 are respectively opened in the direction of the long axis 11 and the short axis 13. The outer oil groove 30 is used to supply oil to the eccentric friction pair, the short axis friction pair and the long axis friction pair on both sides to achieve cooling and lubrication. In this embodiment, the outer oil groove 30 is arranged on the outer peripheral surface of the eccentric part 12, and the structure is simple and easy to process. As the crankshaft 10 rotates, the oil enters the outer oil groove 30 and the eccentric friction pair from the inner oil circuit under the action of centrifugal force, and enters the short axis friction pair and the long axis friction pair.

[0052] Furthermore, in the above embodiment, the depth of the outer oil groove 30 in the middle is greater than that on both sides, and the outlet of the inner oil circuit is opened in the middle of the outer oil groove 30. Since the centrifugal force to which the oil is subjected after entering the inner oil circuit is along the radial direction of the crankshaft 10 or the eccentric portion 12, the outer oil groove 30 can be set as the structure in this embodiment to allow the oil to have a certain radial velocity and reduce the internal energy consumption; and since the oil flows at the maximum velocity at the outlet position, the outlet has a greater depth and space, and can also relieve the oil pressure to a certain extent.

[0053] Specifically, the outer oil groove 30 is arranged along the axial direction of the eccentric part 12. The axial direction is the shortest distance that the outer oil groove 30 can communicate with the long shaft friction pair and the short shaft friction pair at both ends, which can minimize the strength impact on the eccentric part 12 and facilitate processing.

[0054] According to an embodiment of the present invention, the inner oil circuit includes a first oil hole 31 and a second oil hole 32, the first oil hole 31 is connected to the outer oil groove 30, and the second oil hole 32 is connected to the end surface of the eccentric part 12 close to the long shaft 11. In this embodiment, the first oil hole 31 is used to supply oil to the eccentric part friction pair, the long shaft friction pair, and the short shaft friction pair, while the second oil hole 32 and the outer oil groove 30 are used to supply oil to the long shaft friction pair. The function of the inner oil circuit is realized by the first oil hole 31 and the second oil hole 32, which is conducive to realizing accurate oil supply.

[0055] Furthermore, in the above embodiment, the first oil hole 31 is arranged at the short diameter of the eccentric part 12, and the second oil hole 32 is arranged at the long diameter of the eccentric part 12. In this embodiment, the first oil hole 31 and the outer oil groove 30 communicating therewith are arranged at the short diameter, and the outer oil groove 30 needs to penetrate the outer peripheral surface of the eccentric part 12, which reduces the length of the first oil hole 31 and the overall depth of the outer oil groove 30, and can reduce the strength impact of the eccentric part 12. In order to balance the oil pressure, the second oil hole 32 is arranged at the long diameter, which can minimize the strength impact of the eccentric part 12.

[0056] Alternatively, further, in the above embodiment, the second oil hole 32 includes a radial hole 321 and an axial hole 322 that are connected in sequence, the radial hole 321 is connected to the oil pump mechanism, and the opening of the axial hole 322 is set on the end surface of the eccentric part 12. In this embodiment, the radial hole 321 reduces the loss of oil outflow speed, and the axial hole 322 can guide the oil upward. Specifically, the axial hole 322 can be set as a blind hole to guide the cooling oil in one direction.

[0057] Specifically, the first oil hole 31 and the radial hole 321 are symmetrically arranged about the central axis of the oil supply passage. Moreover, the first oil hole 31 and the second oil hole 32 can balance the oil pressure. The first oil hole 31 and the radial hole 321 are symmetrically arranged, so during processing, the first oil hole 31 and the radial hole 321 can be processed by one process such as drilling, which reduces the process and facilitates processing.

[0058] According to one embodiment of the present invention, a first oil storage tank is formed at the root of the long shaft 11, a second oil storage tank is formed at the root of the short shaft 13, and both ends of the outer oil tank 30 are connected to the first oil storage tank and the second oil storage tank, respectively. In this embodiment, the first oil storage tank and the second oil storage tank are used to supply oil to the long shaft friction pair and the short shaft friction pair, respectively, to achieve a temporary oil storage function, to avoid the occurrence of insufficient oil volume, cooling and lubrication during operation, resulting in damage such as sintering of the crankshaft 10.

[0059] like Figure 7 In one embodiment shown in FIG. 1 , a long shaft oil hole 110 is provided in the long shaft 11, and a long shaft root oil hole 111 is provided. A long shaft side oil hole 112 is also provided at the inner end. A short shaft root oil hole 131 is provided at the position where the short shaft 13 is connected to the eccentric portion 12. Figure 8 In one embodiment shown, the long shaft oil hole 110 penetrates to the end of the long shaft 11, and a long shaft root oil hole 111 and a short shaft root oil hole 131 are also provided. In these two embodiments, the long shaft oil hole 110 increases the cavity of the crankshaft 10, which is not conducive to improving the overall rigidity of the crankshaft. The oil hole is opened at the root of the long shaft or the short shaft, which reduces the rigidity there, which is not conducive to improving reliability. Therefore, the present invention shortens the length of the internal oil hole of the crankshaft, reduces the volume of the cavity, avoids opening holes at the root of the long shaft and the short shaft, and effectively ensures the strength of the crankshaft through dual means to improve reliability.

[0060] like Figure 3 and Figure 4 As shown, the present invention further discloses a compressor, comprising a crankshaft 10 of the above structure.

[0061] In one embodiment of the present invention, the compressor further includes a driving assembly and a pump assembly, and the pump assembly includes a crankshaft 10 and a flange assembly of the above structure. The crankshaft 10 is fixed to the rotor of the driving assembly, and the eccentric portion 12 and the roller 41 in the cylinder 40 form an eccentric portion friction pair. The flange assembly includes an upper flange 51 and a lower flange 52 respectively arranged on both sides of the eccentric portion 12, a long shaft friction pair is formed between the upper flange 51 and the long shaft 11, and a short shaft friction pair is formed between the lower flange 52 and the short shaft 13. The muffler 70 is sleeved on the journal 514 of the upper flange 51 and pressed against the mounting surface 510 of the upper flange 51.

[0062] In the present invention, the eccentric friction pair is formed by the eccentric portion 12 and the roller 41 in the cylinder 40. During the rotation of the crankshaft 10, the eccentric portion 12 squeezes the roller 41 in the cylinder 40 to change the working state of the cylinder 40. The upper flange 51 and the lower flange 52 respectively form a long axis friction pair and a short axis friction pair to ensure that the crankshaft 10 can pump oil during the rotation and the oil enters the target area along the oil path mechanism of the crankshaft 10.

[0063] According to one embodiment of the present invention, the upper flange 51 and the root of the long shaft 11 form a first oil storage chamber 61, the lower flange 52 and the root of the short shaft 13 form a second oil storage chamber 62, and the inner wall of the journal 514 is provided with a spiral groove 515, which is connected to the first oil storage chamber 61 or the outer oil groove 30. In this embodiment, the spiral groove 515 is arranged at the journal 514 of the upper flange 51, and the cooling oil enters the spiral groove 515 and climbs upward along the spiral groove 515 under the rotation of the crankshaft 10 to lubricate the main bearing of the long shaft friction pair, and can be directly connected to one end of the long shaft 11 connected to the outer oil groove 30, or can be connected to the first oil storage chamber 61 at the root of the long shaft 11, so as to facilitate the oil in the first oil storage chamber 61 to be transported to various parts of the long shaft friction pair, thereby improving the lubrication and cooling efficiency.

[0064] like Figures 4 to 6 As shown, further, in the above embodiment, the upper end surface of the upper flange 51 is provided with an oil collecting groove 513 around the shaft neck 514, and the upper flange 51 is provided with an air outlet 511, and the inlet of the air outlet 511 is connected to the first oil storage chamber 61 or the spiral groove 515; the outlet of the air outlet 511 is arranged in the oil collecting groove 513, or the outlet of the air outlet 511 is arranged on the outer wall of the shaft neck 514, or the outlet of the air outlet 511 is arranged on the mounting surface 510.

[0065] In actual operation, since the cooling oil contacts each friction pair, the heat of the friction pair will cause the cooling oil to be partially analyzed to form a gas state, so an air outlet 511 is set at the position of the upper flange 51 so that the mixture of gaseous oil and liquid oil can be discharged upward. The long shaft friction pair extends a long length and bears a large load. The inlet of the air outlet 511 can be set in the first oil storage cavity 61 or the spiral groove 515, and the outlet is set at a position after heat exchange, such as the oil collecting groove 513, the outer wall of the journal 514 or the mounting surface 510. Since the diameter of the air outlet hole 511 is relatively small, such as it can be specifically set to 0.5mm~1.5mm, the oil flow resistance is large, and the amount of refrigerant oil flowing out of the air outlet hole 511 is very small. The refrigerant oil flowing out of the air outlet hole 511 is mixed with the refrigerant oil collected in the oil collecting groove 513, and flows out through the oil guide groove 512 into the back pressure chamber 80. Since the outflowing refrigerant oil is a continuous flow, the airflow in the back pressure chamber 80 has little effect on it. Under the action of gravity, this part of the refrigerant oil flows into the oil pool 100, effectively reducing the oil discharge rate of the compressor.

[0066] Specifically, the air outlet hole 511 is arranged at an angle, and the angled arrangement can be based on the inlet and outlet positions, and then directly drilled to connect, which is conducive to the rapid extraction of the gas-liquid mixture.

[0067] Furthermore, in the above embodiment, an oil guide groove 512 is provided on the mounting surface 510, one end of the oil guide groove 512 is connected to the outlet of the air outlet hole 511, and the other end leads to the back pressure chamber 80 of the compressor. In this embodiment, the oil guide groove 512 is provided on the mounting surface 510 to guide the gas-liquid mixture to the back pressure chamber 80 of the compressor, wherein the gas rises into the back pressure chamber 80, returns to the liquid state along the inner wall of the back pressure chamber 80 after cooling, and then returns to the oil pool 100, while the liquid oil directly returns to the oil pool 100, and the oil guide groove 512 can improve the oil guiding ability and the overall circulation efficiency.

[0068] Furthermore, the outlet of the oil guide groove 512 is tilted downward along the radial direction of the upper flange 51, forming an angle α of 0 to 5° with the mounting surface 510. In this embodiment, as the gas-liquid mixture is guided out, the oil guide groove 512 is tilted downward and the depth is increased, which can effectively improve the oil guiding effect and avoid the backflow of the gas-liquid mixture.

[0069] According to one embodiment of the present invention, the first oil storage chamber 61 is provided at the root of the outer circumference of the major axis 11, or at the inner end of the upper flange 51, or is formed by respectively providing grooves on the outer circumference of the upper flange 51 and the outer wall of the major axis 11; the second oil storage chamber 62 is provided at the root of the outer circumference of the minor axis 13, or at the inner end of the lower flange 52, or is formed by respectively providing grooves on the outer circumference of the lower flange 52 and the outer wall of the minor axis 13. In this embodiment, the first oil storage chamber 61 and the second oil storage chamber 62 are separately provided on the major axis 11 and the minor axis 13 of the crankshaft 10 as required, or can be separately provided on the upper flange 51 and the lower flange 52, or can be formed together with the upper flange 51 and the lower flange 52, and the processing method is not limited, and can be flexibly provided as required.

[0070] The present invention also discloses an electrical appliance, including a compressor of the above structure. The electrical appliance includes but is not limited to a refrigerator, an air conditioner, and other electrical appliances that require a refrigeration function. The compressor of the above structure is applied to such electrical appliances, which can effectively increase the service life, reduce the loss of the compressor, and save energy.

[0071] The present invention also discloses a method for supplying oil to a compressor, which is implemented by using the crankshaft 10 of the above structure, and includes the following steps:

[0072] Pumping oil at the stub shaft 13 of the crankshaft 10 with a built-in oil pumping mechanism;

[0073] The oil is supplied to the friction pair along the internal oil passage provided in the eccentric portion 12 of the crankshaft 10;

[0074] The outer oil groove 30 outside the eccentric portion 12 of the crankshaft 10 is used to supply oil to each friction pair in a balanced manner.

[0075] The oil supply method of the present invention utilizes an oil pump mechanism to supply oil to the outside through the inner oil path of the eccentric part 12 and the outer oil groove 30. The oil supply path is simple, the oil output can be reduced, the energy loss can be effectively reduced, and accurate oil supply to each friction pair can be achieved.

[0076] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0077] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A crankshaft (10), comprising a long shaft (11), an eccentric portion (12) and a short shaft (13), characterized in that: An oil pump mechanism is also provided in the short shaft (13); an internal oil circuit is formed in the eccentric portion (12); an oil outlet of the internal oil circuit is formed outside the eccentric portion (12); and an oil inlet of the internal oil circuit is connected to the oil pump mechanism; an external oil groove is also provided on the outer peripheral surface of the eccentric portion; the external oil groove (30) is connected to the oil outlet of the internal oil circuit; two ends of the external oil groove (30) are respectively opened in the direction of the long shaft (11) and the short shaft (13); and the oil pump mechanism supplies oil to each friction pair of the crankshaft (10) through the internal oil circuit and the external oil groove (30); The inner oil passage comprises a first oil hole (31) and a second oil hole (32), the first oil hole (31) being connected to the outer oil groove (30), and the second oil hole (32) being connected to an end surface of the eccentric portion (12) facing the long axis (11); The first oil hole (31) is arranged at the short diameter of the eccentric portion (12), and the second oil hole (32) is arranged at the long diameter of the eccentric portion (12); The long shaft (11) is a solid shaft structure, and the oil pump mechanism comprises a central oil hole (21), the central oil hole (21) is opened from the short shaft (13) to the eccentric part (12), and the central oil hole (21) is connected to the first oil hole (31); The second oil hole (32) comprises a radial hole (321) and an axial hole (322) which are connected in sequence, the radial hole (321) being connected to the oil pump mechanism, and the opening of the axial hole (322) being arranged on the end surface of the eccentric portion (12).

2. The crankshaft (10) according to claim 1, characterized in that The depth of the outer oil groove (30) in the middle is greater than the depth of the two sides, and the outlet of the inner oil circuit is opened in the middle of the outer oil groove (30).

3. The crankshaft (10) according to claim 1, characterized in that The root of the long axis (11) forms a first oil storage tank, the root of the short axis (13) forms a second oil storage tank, and both ends of the outer oil tank (30) are respectively connected to the first oil storage tank and the second oil storage tank.

4. A compressor, characterized in that: Comprising a crankshaft (10) as claimed in any one of claims 1 to 3.

5. The compressor according to claim 4, characterized in that It also includes a drive assembly and a pump body assembly, and the pump body assembly includes: The crankshaft (10) is fixed to the rotor of the drive assembly, and the eccentric portion (12) and the roller (41) in the cylinder (40) form an eccentric portion friction pair; The flange assembly comprises an upper flange (51) and a lower flange (52) respectively arranged on both sides of the eccentric portion (12); a long shaft friction pair is formed between the upper flange (51) and the long shaft (11); a short shaft friction pair is formed between the lower flange (52) and the short shaft (13); and a muffler (70) is sleeved on a journal (514) of the upper flange (51) and pressed against a mounting surface (510) of the upper flange (51).

6. The compressor according to claim 5, characterized in that The upper flange (51) and the root of the long shaft (11) form a first oil storage chamber (61) correspondingly, and the lower flange (52) and the root of the short shaft (13) form a second oil storage chamber (62) correspondingly. The inner wall of the journal (514) is provided with a spiral groove (515), and the spiral groove (515) is connected to the first oil storage chamber (61) or the outer oil groove (30).

7. The compressor according to claim 6, characterized in that An oil collecting groove (513) is provided on the upper end surface of the upper flange (51) surrounding the shaft neck (514), and an air outlet hole (511) is provided on the upper flange (51), wherein the inlet of the air outlet hole (511) is communicated with the first oil storage cavity (61) or the spiral groove (515); The outlet of the air outlet hole (511) is arranged in the oil collecting tank (513), or The outlet of the air outlet hole (511) is arranged on the outer wall of the journal (514), or The outlet of the air outlet hole (511) is arranged on the mounting surface (510).

8. The compressor according to claim 7, characterized in that An oil guide groove (512) is provided on the mounting surface (510), one end of the oil guide groove (512) is connected to the outlet of the air outlet hole (511), and the other end leads to the back pressure chamber (80) of the compressor.

9. The compressor according to claim 8, characterized in that The outlet of the oil guide groove (512) is inclined downward along the radial direction of the upper flange (51), and forms an angle of 0 to 5° with the mounting surface (510).

10. The compressor according to claim 6, characterized in that The first oil storage chamber (61) is formed at the root of the outer peripheral surface of the long shaft (11), or at the inner end of the upper flange (51), or by grooves respectively formed on the outer peripheral surface of the upper flange (51) and the outer wall of the long shaft (11); the second oil storage chamber (62) is formed at the root of the outer peripheral surface of the short shaft (13), or at the inner end of the lower flange (52), or by grooves respectively formed on the outer peripheral surface of the lower flange (52) and the outer wall of the short shaft (13).

11. An electrical appliance, characterized in that: Comprising the compressor according to any one of claims 4 to 10.

12. A method for supplying oil to a compressor, characterized in that: The method is implemented by using the crankshaft (10) according to any one of claims 1 to 3, comprising the following steps: Pumping oil at the short shaft (13) of the crankshaft (10) by means of a built-in oil pumping mechanism; Oil is supplied to the friction pair along an internal oil passage provided in an eccentric portion (12) of the crankshaft (10); The outer oil groove (30) outside the eccentric portion (12) of the crankshaft (10) is used to supply oil to each friction pair in a balanced manner.

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