Crankshaft, variable frequency compressor and refrigeration equipment

Abstract

The present invention belongs to the technical field of compressors, and more specifically, it relates to a crankshaft, a variable frequency compressor and a refrigeration device. Among them, the crankshaft includes a main shaft, a crankshaft and a crank. The crankshaft is installed on one end of the main shaft through the crank. The main shaft is provided with an oil suction cavity and an oil distribution channel extending to penetrate the crankshaft. The outer wall surface of the main shaft is provided with a first spiral oil groove and a second spiral oil groove. One end of the first and second spiral oil grooves is connected to the oil suction cavity. The main shaft is also provided with a first oil hole and a second oil hole. The first and second spiral oil grooves are connected to the oil distribution channel through the first oil hole and the second oil hole respectively. The first and second spiral oil grooves rotate in opposite directions to ensure that lubricating oil can be supplied when the crankshaft rotates forward and backward. The first oil hole and the second oil hole are arranged at intervals and staggered with each other along the radial direction of the main shaft. The amount of lubricating oil leaking through the first / second oil hole and falling back is reduced, the low-speed oiling of the crankshaft is more guaranteed, and the lubricating oil supply is more stable and reliable.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and more specifically, relates to a crankshaft, a variable frequency compressor and a refrigeration device. Background Art

[0002] The crankshaft is one of the most important parts in all types of compressors. It bears the force transmitted from the connecting rod, converts it into torque output and drives other accessories of the compressor to work. Generally, the crankshaft includes a main shaft, a crank and a crankshaft. An oil groove is provided on the main shaft. The oil groove and other cavities and hole structures provided on the main shaft and the crankshaft form the crankshaft's oil supply system. The oil supply system is used to introduce or lead lubricating oil such as engine oil into or out of the crankshaft, thereby forming a lubricating oil film on the surface of the crankshaft and other moving parts to lubricate the moving parts and ensure that the crankshaft and other moving parts can operate flexibly, thereby efficiently transmitting torque. In the field of compressors, variable frequency compressors are widely used in refrigerators, air conditioners and other electrical appliances because they can continuously change the output energy and can operate smoothly under low speed and low energy consumption conditions. They have the advantages of high working efficiency, stable operation and low energy consumption.

[0003] However, for variable frequency compressors, since they require frequent frequency conversion and capacity change, the compressor needs to be able to complete efficient operation at high and low speeds. This process not only requires the crankshaft oil supply system to be able to stably supply oil under the forward and reverse conditions of the compressor, but also requires its oil supply system to have stable and reliable low-speed oiling capabilities to ensure that the variable frequency compressor can maintain efficient operation under low-frequency and low-capacity conditions.

[0004] In the related art, in order to improve the oil supply capacity of the variable frequency compressor at low speed, a commonly used method is to increase the head of the oil pump that pumps the lubricating oil or add a micro pump in the crankshaft to compensate for the reduction of the upward centrifugal force of the lubricating oil at low speed, thereby ensuring the amount of lubricating oil at low speed. However, this treatment method will increase the production cost of the variable frequency compressor, which is inconsistent with the cost control of the variable frequency compressor. Summary of the invention

[0005] The main purpose of the embodiments of the present invention is to provide a crankshaft, a variable frequency compressor and a refrigeration device to solve the technical problem in the prior art that the variable frequency compressor increases the production cost of the variable frequency compressor by increasing the oil pump head or adding a micro pump to increase the lubricating oil supply at low speed.

[0006] In order to achieve the aforementioned purpose of the present invention, a lubricating oil system needs to be set on the crankshaft of the compressor. At the same time, since the compressor has two rotational operating conditions, forward rotation and reverse rotation, especially for variable frequency compressors, forward and reverse rotation are related to the frequency modulation and speed regulation of the compressor. Therefore, to improve the lubricating oil supply of the variable frequency compressor at low speed, it is necessary to first meet the lubricating oil supply of the compressor under both forward and reverse conditions, that is, to ensure that the lubricating oil can flow and oil under both forward and reverse conditions of the compressor. On this basis, the inventor further studied the amount of lubricating oil applied at low speed, designed various lubricating oil supply systems that can stably supply oil under forward and reverse conditions, and tested each system separately, and provided the following technical solutions based on the test results.

[0007] The technical solution adopted by the present invention is: to provide a crankshaft, including a main shaft, a crankshaft and a crank, the crankshaft is installed on one end of the main shaft through the crank, an end of the main shaft away from the crankshaft is provided with an oil suction cavity, and the other end of the main shaft connected to the crankshaft is provided with a distribution oil channel, and the distribution oil channel extends from the end away from the oil suction cavity to pass through the crankshaft; a first spiral oil groove and a second spiral oil groove with opposite rotation directions are provided on the outer peripheral wall of the main shaft, one end of the first spiral oil groove and the second spiral oil groove are connected to the oil suction cavity, and the main shaft is also provided with a first oil hole and a second oil hole, the other end of the first spiral oil groove is connected to the distribution oil channel through the first oil hole, and the other end of the second spiral oil groove is connected to the distribution oil channel through the second oil hole, and the plane extending radially along the main shaft is used as the projection plane, and the angle θ between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is 25°<θ<155°.

[0008] In some embodiments, the first oil hole and the second oil hole are located at any position on the peripheral wall of the oil distribution channel.

[0009] In some embodiments, the first oil hole and the second oil hole are located on different sides of a peripheral wall of the oil distribution passage, or the first oil hole and the second oil hole are located on the same side of a peripheral wall of the oil distribution passage.

[0010] In some embodiments, the first oil hole and the second oil hole are arranged at the same height along the central axis direction of the main shaft.

[0011] In some embodiments, the first oil hole and the second oil hole are arranged at different heights along the central axis direction of the main shaft, and the height of the top of the first oil hole is lower than or equal to the height of the bottom of the second oil hole.

[0012] In some embodiments, the main shaft is further provided with a third oil hole, and the first spiral oil groove and the second spiral oil groove are connected to the oil suction cavity through the third oil hole.

[0013] In some embodiments, the number of the third oil hole is one, and the first spiral oil groove and the second spiral oil groove are connected to the oil suction cavity through the same third oil hole;

[0014] Alternatively, the number of the third oil holes is two, and the first spiral oil groove and the second spiral oil groove are respectively connected to the oil suction inner cavity through two different third oil holes.

[0015] In some embodiments, the first spiral oil groove and the second spiral oil groove have different rotational pitches.

[0016] In some embodiments, the first spiral oil groove and the second spiral oil groove are disposed on opposite sides of the main shaft.

[0017] In some embodiments, the distribution oil channel is a straight channel, and the central axis of the distribution oil channel is parallel to the central axis of the main shaft;

[0018] Alternatively, the central axis of the distribution oil passage coincides with the central axis of the main shaft;

[0019] Alternatively, the distribution oil passage is arranged to be inclined relative to the central axis of the main shaft.

[0020] In some embodiments, a section of the distribution oil passage located on the main shaft is a straight channel section, and a section of the distribution oil passage located on the crankshaft is an arc-shaped channel section that bends away from the main shaft.

[0021] In some embodiments, the central axis of the straight channel segment is parallel to the central axis of the main shaft;

[0022] Alternatively, the central axis of the straight channel section coincides with the central axis of the main shaft;

[0023] Alternatively, the straight channel section is arranged to be inclined relative to the central axis of the main shaft.

[0024] The above one or more technical solutions in the crankshaft provided by the embodiment of the present invention have at least one of the following technical effects: compared with the prior art, the crankshaft of the present invention, by arranging a first spiral oil groove and a second spiral oil groove with opposite rotation directions on the main shaft, ensures that the compressor using the crankshaft can supply lubricating oil through the first spiral oil groove and the second spiral oil groove respectively during forward rotation and reverse rotation. At the same time, a first oil hole is arranged on the main shaft to connect the first spiral oil groove and the distribution oil channel, and a second oil hole is arranged to connect the distribution oil channel of the second spiral oil groove. The plane extending radially along the main shaft is used as the projection plane, and the angle θ between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is set to be greater than 25°, so as to ensure that the first oil hole and the second oil hole are spaced from each other to avoid the lubricating oil flowing out of the first oil hole directly falling back through the second oil outlet hole. The angle θ between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is set to be less than 155°. The first oil hole and the second oil hole are staggered and not directly opposite to each other along the radial direction of the main shaft to avoid the lubricating oil flowing out of the first oil hole from being thrown into the second oil hole and falling back under the action of centrifugal force. In this way, the amount of lubricating oil entering the distribution oil channel that leaks and falls back through the second oil hole (or the first oil hole) can be reduced. Especially for compressors working under low-frequency conditions, the reduction in the amount of lubricating oil falling back provides better protection for low-speed oiling, thereby ensuring that there is still enough lubricating oil to be output from the crankshaft through the distribution oil channel at low speeds, ensuring stable oil supply at low speeds. In addition, the crankshaft optimizes its own structure to increase the amount of lubricating oil supplied at low speeds, without increasing the head of the oil pump or adding a micro pump, which helps to reduce the manufacturing cost of the variable frequency compressor using the crankshaft.

[0025] Another technical solution of the present invention is to provide a variable frequency compressor, comprising the above-mentioned crankshaft.

[0026] The beneficial effect of the variable frequency compressor provided by the embodiment of the present invention is that: compared with the prior art, the variable frequency compressor of the present invention reduces the production cost of the variable frequency compressor by using the above-mentioned crankshaft, and when the variable frequency compressor works under low-frequency conditions, it can supply a sufficient amount of lubricating oil to ensure efficient operation of the compressor. The variable frequency compressor can ensure stable oil supply under low-frequency, medium-frequency and high-frequency conditions, and the operation of the compressor is more stable and efficient.

[0027] Another technical solution of the present invention is to provide a refrigeration device, comprising the above-mentioned variable frequency compressor.

[0028] The beneficial effects of the refrigeration equipment provided by the embodiment of the present invention are: compared with the prior art, the refrigeration equipment of the present invention, due to the use of the above-mentioned variable frequency compressor, has a reduced manufacturing cost of the refrigeration equipment, and the operation of the refrigeration equipment is more stable, the refrigeration effect is more stable, the operating energy consumption is lower, and the service life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 A schematic diagram of the structure of a crankshaft provided in one embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of the front view of the crankshaft shown;

[0032] Figure 3 For along Figure 2 Sectional view along line AA;

[0033] Figure 4 A schematic front view of the structure of a crankshaft provided in another embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the positional relationship between the first oil hole and the second oil hole of the main shaft of one embodiment of the present invention Figure 1 ;

[0035] Figure 6 Schematic diagram of the positional relationship between the first oil hole and the second oil hole of the main shaft of another embodiment of the present invention Figure 2 ;

[0036] Figure 7 A front view structural schematic diagram of a crankshaft provided in yet another embodiment of the present invention.

[0037] In the figure, each figure is mainly marked as:

[0038] 10. Main shaft; 11. Oil suction cavity; 12. Distribution oil channel; 121. Straight channel section; 122. Arc channel section; 13. First spiral oil groove; 14. Second spiral oil groove; 15. First oil hole; 151. First rotary hole; 16. Second oil hole; 161. Second rotary hole; 17. Third oil hole; 20. Crank; 30. Crank shaft; 31. Oil outlet hole. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figures 1 to 7 It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] References to "one embodiment", "some embodiments" or "an embodiment" described in the present specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present invention. The phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, specific features, structures or characteristics may be combined in any suitable manner.

[0044] Generally, a commonly used compressor usually includes a housing, a crankcase, a crankshaft, an oil pump, a connecting rod, a piston, a piston pin, a valve group and a drive motor, etc. An oil pool storing lubricating oil (also known as refrigeration oil) is arranged at the bottom of the housing, and the crankshaft includes a main shaft connected to the drive motor, a crank connected to one end of the main shaft, and a crankshaft connected to the main shaft through the crank. A lubricating oil supply system (referred to as the oil supply system) is generally arranged inside the crankshaft, and the oil pump is installed at the bottom of the crankshaft, and the oil pumping outlet of the oil pump is connected to the oil supply system inside the crankshaft. When the compressor is working, the crankshaft rotates. At this time, the centrifugal force of the crankshaft rotation and the pumping pressure of the oil pump can be used to transport the lubricating oil at the bottom of the housing through the oil supply system and lead it to the various friction pairs of the compressor for lubrication, thereby reducing the friction loss between the various components in the compressor during operation. At the same time, the lubricating oil also has a certain cooling effect. Therefore, the amount of oil applied to the crankshaft has an important influence on the normal operation of the compressor.

[0045] For variable frequency compressors, they can continuously adjust the output drive energy by changing the operating speed according to the needs of work. The lower the speed, the lower the power consumption. Therefore, variable frequency compressors have the advantages of high efficiency and energy saving. In order to ensure good operating results and reduce the wear of each friction pair, the speed of variable frequency compressors is often controlled at around 1200rpm to 6000rpm. At higher speeds, the crankshaft has a higher rotation speed, which can provide a larger centrifugal lift to the lubricating oil, thereby ensuring sufficient supply of lubricating oil. When the speed decreases, the rotation speed of the crankshaft decreases, and the centrifugal lift provided to the lubricating oil decreases, resulting in insufficient supply of lubricating oil, and the friction pair cannot be effectively lubricated. The operating condition of the variable frequency compressor at low speed is poor.

[0046] Since the variable frequency compressor has two rotational operating conditions, forward rotation and reverse rotation, the oil supply system set in the crankshaft needs to meet the lubricating oil supply under the two operating conditions of the variable frequency compressor forward rotation in the clockwise direction and reverse rotation in the counterclockwise direction, that is, to ensure that the lubricating oil can be applied to the friction pair under both the forward and reverse rotation conditions of the variable frequency compressor. On this basis, the embodiment of the present invention further optimizes the design of the crankshaft of the variable frequency compressor, improves the amount of lubricating oil applied to the crankshaft at low speed, and provides a lubricating oil supply system that can stably supply oil under forward and reverse rotation conditions. The crankshaft of the present invention is described in detail below in conjunction with specific embodiments.

[0047] See also Figure 1 and Figure 2 ,in, Figure 1 A schematic diagram of the structure of a crankshaft provided in one embodiment of the present invention, Figure 2The front view of the crankshaft provided in the embodiment is a schematic diagram, and part of the structure in the figure is a perspective structure to show the flow path of the lubricating oil. The crankshaft provided in this embodiment can achieve stable oil supply under low speed, medium speed and high speed rotation, and is suitable for installation in a compressor, especially a variable frequency compressor.

[0048] Specifically, Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a crankshaft, which includes a main shaft 10 for driving connection with an external driving component, a crankshaft 30 installed at a first end of the main shaft 10, and a crank 20 connecting the main shaft 10 and the crankshaft 30. The crankshaft 30 is relatively close to the central axis of the main shaft 10 (such as Figure 2 The main shaft 100 is eccentrically arranged (as shown by the center line R), an oil suction cavity 11 is arranged at one end of the main shaft 100, the oil suction cavity 11 is arranged at one end away from the crankshaft 30 and extends along the central axis direction of the main shaft 10, and a distribution oil passage 12 is arranged at the other end of the main shaft 10 connected to the crankshaft 30, and the distribution oil passage 12 extends along the central axis of the main shaft 10, and the distribution oil passage 12 extends from the end of the oil suction cavity 11 to penetrate the crankshaft 30. Among them, the end of the oil suction cavity 11 away from the crank 20 is openly arranged for communication with the oil outlet of the oil pump, and the distribution oil passage 12 is connected with the oil suction cavity 11 and is used to output the lubricating oil from the crankshaft, so that the lubricating oil reaches the various operating parts inside the compressor for lubrication, ensuring that the various operating parts of the compressor using the crankshaft of this embodiment can operate normally, and playing a role in cooling down the various parts.

[0049] The outer peripheral wall of the main shaft 10 is provided with a first spiral oil groove 13 and a second spiral oil groove 14 in opposite directions. In this embodiment, the first spiral oil groove 13 is spirally arranged in a counterclockwise direction (eg Figure 1 The second spiral oil groove 14 is spirally arranged in a clockwise direction (as shown by the arrow R1 in the middle). Figure 1The first spiral oil groove 13 and the second spiral oil groove 14 both have a first end and a second end that are arranged opposite to each other, and the first end is toward the bottom end of the main shaft 10, and the second end is toward the top end of the main shaft 10, wherein the first ends of the first spiral oil groove 13 and the second spiral oil groove 14 are both communicated with the oil suction cavity 11, and the top end of the main shaft 10 is also provided with a first oil hole 15 and a second oil hole 16, the second end of the first spiral oil groove 13 is communicated with the distribution oil passage 12 through the first oil hole 15, and the second end of the second spiral oil groove 14 is communicated with the distribution oil passage 12 through the second oil hole 16, so that the oil suction cavity 11 is communicated with the distribution oil passage 12 through the two spiral oil grooves respectively. In this way, since the first spiral oil groove 13 is spirally arranged in the counterclockwise direction, when the crankshaft rotates counterclockwise, the lubricating oil pumped into the oil suction inner cavity 11 by the oil pump enters the first spiral oil groove 13 connected thereto, and rises from the first end to the second end and enters the distribution oil passage 12 through the first oil hole 15 by the centrifugal force generated by the counterclockwise rotation of the main shaft 10, and further flows out of the distribution oil passage 12 by the centrifugal force of the crankshaft 30. Conversely, when the crankshaft rotates clockwise, the lubricating oil enters the second spiral oil groove 14 from the oil suction inner cavity 11, and rises from the first end to the second end by the centrifugal force generated by the clockwise rotation of the main shaft 10, and then enters the distribution oil passage 12 through the second oil hole 16, and then further flows out of the distribution oil passage 12 by the centrifugal force of the crankshaft 30. In this way, the compressor using the crankshaft of this embodiment can achieve normal oiling under forward and reverse rotation conditions by using the first spiral oil groove 13 and the second spiral oil groove 14 with different rotation directions on the main shaft 10, thereby being able to supply lubricating oil under operating conditions with different rotation directions.

[0050] Please also refer to Figure 3 ,in, Figure 3 For along Figure 2 In this embodiment, the plane extending radially along the main shaft 10 is taken as the projection plane, and the center axis ( Figure 3 L1 in the figure) and the center axis of the second oil hole 16 ( Figure 3 L2 in the projection plane is θ, and θ is greater than 25° and less than 155°. It should be noted that, since there is a certain thickness dimension between the outer wall of the main shaft 10 and the peripheral wall of the distribution oil passage 12, the second end of the first spiral oil groove 13 and the second end of the second spiral oil groove 14 need to be deflected toward the inside of the main shaft 10 and penetrate the part between the outer wall of the main shaft 10 and the peripheral wall of the distribution oil passage 12 before being connected with the first oil hole 15 and the second oil hole 16, respectively. In this way, a first rotary hole 151 will be formed at the position where the first spiral oil groove 13 is connected to the first oil hole 15, and a second rotary hole 161 will be formed at the position where the second spiral oil groove 14 is connected to the second oil hole 16, as shown in FIG. Figure 1 and Figure 3In this embodiment, the first oil hole 15 and the second oil hole 16 are openings located on the peripheral wall of the oil distribution channel 12 .

[0051] Thus, by setting the angle θ to satisfy θ>25°, the two oil holes are ensured to be spaced apart from each other, such as Figure 4 As shown, at this time, the lubricating oil flowing out of the first oil hole 15 will not directly fall back through the second oil hole 16. By setting the angle θ to satisfy θ<155°, the two oil holes are staggered and not directly opposite each other along the radial direction of the main shaft 10, thereby effectively preventing the lubricating oil flowing out of the first oil hole 15 from being thrown into the second oil hole 16 and falling back under the action of centrifugal force. In this way, the amount of lubricating oil entering the distribution oil channel 12 that leaks and falls back through the second oil hole 16 (or the first oil hole 15) can be reduced, especially for compressors working under low-frequency conditions. The reduction in the amount of lubricating oil falling back provides better protection for low-speed oiling, thereby ensuring that there is still enough lubricating oil at low speeds to be output from the crankshaft 30 through the distribution oil channel 12, ensuring stable oil supply at low speed. In addition, since the first oil hole 15 and the second oil hole 16 are spaced or staggered from each other, the crankshaft of this embodiment only needs to have one distribution oil passage 12 to ensure sufficient supply of lubricating oil, and there is no need to have two independent distribution oil passages 12 that are respectively connected to the first oil hole 15 and the second oil hole 16. The difficulty of processing and manufacturing the crankshaft is reduced, and the strength of the crankshaft is more guaranteed.

[0052] In some specific embodiments, the above-mentioned angle θ can be 30°, 45°, 60°, 75°, 90°, 120°, 145° and 150°, etc., which can be selected according to needs during specific design. The value of the angle θ is not uniquely limited here.

[0053] In another embodiment of the present invention, see Figure 3 and Figure 4 , the arrangement positions of the first oil hole 15 and the second oil hole 16 in the specific embodiment are further described. Figure 4 FIG. 1 is a front view of the crankshaft of the present embodiment, and part of the structure in the figure is a perspective structure to show the flow path of the lubricating oil. In the specific embodiment of the present invention, the first oil hole 15 and the second oil hole 16 can be located at any position of the peripheral wall of the distribution oil channel 12, as long as the two oil holes are set at different heights along the central axis of the main shaft 10.

[0054] In some specific embodiments, Figure 2As shown, the first oil hole 15 and the second oil hole 16 are respectively located on the opposite or adjacent sides of the peripheral wall of the distribution oil channel 12, that is, the two oil holes are located on different sides of the peripheral wall of the distribution oil channel 12. At this time, the first spiral oil groove 13 and the second spiral oil groove 14 respectively supply oil to the distribution oil channel 12 on different sides of the peripheral wall of the distribution oil channel 12. In this way, the two spiral oil grooves can be arranged on the opposite sides of the main shaft 10 along the radial direction of the main shaft 10, and can be arranged as roughly symmetrically as possible on the outer peripheral wall of the main shaft 10. Since grooving on the outer peripheral wall of the main shaft 10 will affect the overall strength of the main shaft 10, therefore, arranging the two oil grooves roughly symmetrically on both sides of the main shaft 10 can minimize the influence of the oil grooves on the overall strength of the main shaft 10.

[0055] In some other specific embodiments, Figure 4 As shown, the first oil hole 15 and the second oil hole 16 can also be located on the same side of the peripheral wall of the distribution oil channel 12. In this case, the extension length of one of the two oil grooves can be set longer. In this way, when the crankshaft has a higher rotation speed in a certain rotation direction, the crankshaft needs to provide a larger amount of lubricating oil supply in this rotation direction. Correspondingly, the length of the oil groove consistent with the rotation direction is set longer, which can increase the amount of lubricating oil supply in this direction. For example, in a specific embodiment, when the crankshaft rotates at a higher speed in the counterclockwise direction, the first spiral oil groove 13 is set longer than the second spiral oil groove 14. When the crankshaft rotates counterclockwise, the amount of lubricating oil supplied through the first spiral oil groove 13 is larger, which is more conducive to the lubrication of the crankshaft and other operating parts of the compressor using the crankshaft.

[0056] Please read further Figure 5 and Figure 6 ,in, Figure 5 and Figure 6 The following is a schematic diagram of the positional relationship between the first oil hole 15 and the second oil hole 16 of the main shaft 10 in two different embodiments. In combination with the specific positions of the two oil holes, the setting of the angle between the central axis of the first oil hole 15 and the central axis of the second oil hole 16 in the projection plane is described.

[0057] Specifically, Figure 5 As shown in the figure, when the first oil hole 15 and the second oil hole 16 are on the same side or adjacent sides of the peripheral wall of the distribution oil channel 12, θ>25° is set to ensure that the axial direction of the main shaft 10 (such as Figure 5 The two oil holes are staggered with each other. When the crankshaft 10 rotates at a relatively low speed, the centrifugal force on the lubricating oil is relatively small. At this time, most of the lubricating oil will be transported along the axial direction of the main shaft 10 under the pumping pressure of the oil pump, and will flow out of the corresponding oil holes and roughly along the Figure 5The two oil holes are staggered along the axial direction of the main shaft 10 to prevent the lubricating oil flowing out along the axial direction from leaking again when it rises along the channel wall of the distribution oil channel 12. When the first oil hole 15 and the second oil hole 16 are located on opposite sides of the peripheral wall of the distribution oil channel 12, θ<155° is set. Figure 6 As shown, ensure that the radial direction of the main shaft 10 (such as Figure 6 The two oil holes are staggered. When the crankshaft rotates at high speed, the lubricating oil flows out from the first oil hole 15 or the second oil hole 16. Most of the lubricating oil is thrown out in the radial direction of the main shaft 10 due to the centrifugal force, and flows out along the radial direction of the main shaft 10. Figure 6 The oil continues to flow in the direction indicated by the middle arrow, and the two oil holes are arranged to be staggered in the radial direction of the main shaft 10 to prevent the lubricating oil flowing out in the radial direction from leaking again when rising along the inner wall of the distribution oil channel 12.

[0058] In another embodiment of the present invention, please continue to refer to Figure 3 The intersection of the center axis of the first oil hole 15 and the center axis of the second oil hole 16 in the above-mentioned projection plane is located on the rotation axis of the main shaft 10. When the main shaft 10 rotates, the centrifugal force exerted on the lubricating oil in the first oil hole 15 and the second oil hole 16 is roughly equal. In this way, the staggered arrangement of the two oil holes can enable most of the lubricating oil to flow out of the crankshaft 30 through the distribution oil channel 12, thereby ensuring the supply of lubricating oil.

[0059] It can be understood that in some other embodiments, the intersection of the central axes of the two oil holes in the projection plane can also be set away from the rotation axis of the main shaft 10. When the main shaft 10 rotates, the centrifugal force exerted on the lubricating oil at the two oil holes is different. When the crankshaft has a higher rotation speed in a certain rotation direction, by increasing the centrifugal force exerted on the lubricating oil at the oil holes in the rotation direction, it is helpful to increase the supply amount of lubricating oil in the direction.

[0060] In another embodiment of the present invention, see Figure 1 and Figure 2 In the present embodiment, the second oil hole 16 of the first oil hole 15 is arranged at the same or different heights along the central axis direction of the main shaft 10, wherein the same height means that the hole center of the first oil hole 15 and the hole center of the second oil hole 16 are arranged at the same height, and the different height means that the top of the first oil hole 15 is lower than the top of the second oil hole 16, and the bottom of the first oil hole 15 is lower than the bottom of the second oil hole 16, that is, the two oil holes are staggered in the axial direction of the main shaft 10.

[0061] In some specific embodiments, the top of the first oil hole 15 is set lower than the bottom of the second oil hole 16, or the top of the first oil hole 15 and the bottom of the second oil hole 16 are located on the same straight line along the radial direction of the main shaft 10, that is, the first oil hole 15 and the second oil hole 16 are also completely staggered in the axial direction of the main shaft 10, thereby further reducing the amount of lubricating oil leaking through the first oil hole 15 or the second oil hole 16, and better ensuring sufficient supply of lubricating oil.

[0062] In another embodiment of the present invention, see Figure 1 and Figure 2 A third oil hole 17 is also provided near the bottom end of the main shaft 10. The third oil hole 17 passes through the oil suction cavity 11. The first spiral oil groove 13 and the second spiral oil groove 14 are connected to the oil suction cavity 11 through the third oil hole 17. The lubricating oil in the oil suction cavity 11 can enter the first spiral oil groove 13 and the second spiral oil groove 14 through the third oil hole 17 under the pressure of the oil pump.

[0063] In some specific embodiments, Figure 1 As shown, a third oil hole 17 can be provided on the main shaft 10, and the two spiral oil grooves are connected to the oil suction cavity 11 through the same third oil hole 17. In this way, only one third oil hole 17 is provided on the main shaft 10, which reduces the processing and manufacturing steps of the main shaft 10, reduces the processing difficulty, and improves the production accuracy and efficiency of the main shaft 10.

[0064] In some other specific embodiments (not shown), two third oil holes 17 can also be provided on the main shaft 10, and the two spiral oil grooves are connected to the oil suction cavity 11 through different third oil holes 17. In this way, the two spiral oil grooves are independently connected to the oil suction cavity 11, and the oiling processes do not affect each other. For some main shafts 10 with larger sizes and relatively low difficulty in processing the two third oil holes 17, this design method can be considered.

[0065] In another embodiment of the present invention, the rotation pitches of the first spiral oil groove 13 and the second spiral oil groove 14 are different. When the crankshaft has a higher rotation speed in a certain rotation direction, the crankshaft needs to provide a larger lubricating oil supply in this rotation direction. Thus, by setting the pitches of the first spiral oil groove 13 and the second spiral oil groove 14 to be different, the extension length of one of the first spiral oil groove 13 and the second spiral oil groove 14 can be set longer to match the rotation speed of the crankshaft in this direction, thereby increasing the lubricating oil supply in the high rotation speed direction and avoiding obvious oversupply in the low rotation speed direction.

[0066] It can be understood that the rotational pitch of the two spiral oil grooves can also be set equal. When the crankshaft rotates forward or reversely and the speed is roughly equal, the amount of lubricating oil supplied through the two spiral oil grooves is also roughly equal, and the oil supply control is more convenient.

[0067] In another embodiment of the present invention, see Figure 2 and Figure 4 The distribution oil passage 12 of this embodiment is set as a straight channel. An oil outlet hole 31 is opened at the top of the crankshaft 30. The distribution oil passage 12 runs through the oil outlet hole 31. The lubricating oil flows out from the top of the crankshaft 30 through the distribution oil passage 12 and finally reaches the interior of the compressor using the crankshaft of this embodiment, and effectively lubricates various running parts.

[0068] In a specific embodiment, the central axis of the distribution oil passage 12 is arranged parallel to the central axis of the main shaft 10, or the distribution oil passage 12 can also be arranged obliquely relative to the central axis of the main shaft 10. Specifically, the central axis of the distribution oil passage 12 can be arranged to coincide with the central axis of the main shaft 10, such as Figure 2 and Figure 4 As shown, in this way, when the distribution oil channel 12 is processed and manufactured, the channel positioning is more convenient.

[0069] In another embodiment of the present invention, see Figure 7 , Figure 7 A front view of a crankshaft provided for another embodiment of the present invention, in which part of the structure is a perspective structure, so as to illustrate the flow path of the lubricating oil. In this embodiment, a section of the upper oil channel 12 located at the main shaft 10 is a straight channel section 121, and a section of the upper oil channel 12 located at the crankshaft 30 is an arc-shaped channel section 122 that is bent away from the main shaft 10. An oil outlet hole 31 is provided on the side wall of the crankshaft 30, and the arc-shaped channel section 122 passes through the oil outlet hole 31. When the crankshaft rotates at a high speed, the oil outlet mode of the lubricating oil flowing out from the top of the crankshaft may cause the oil outlet position to be too high, which is not convenient for lubricating the relatively low position of the compressor, such as the piston, etc. Therefore, an oil outlet hole 31 is provided on the side wall of the crankshaft 30, and the distribution oil channel 12 is set into an arc-shaped channel that is bent away from the main shaft 10 after entering the crankshaft 30, so that the lubricating oil flows out from the outer peripheral wall of the crankshaft 30, so as to better lubricate the piston and other components. Furthermore, the channel structure that is curved away from the main shaft 10 can make good use of the centrifugal force when the crankshaft 30 rotates, and the outflow of lubricating oil is more guaranteed.

[0070] Of course, in some other embodiments, the portion of the distribution oil passage 12 located on the crankshaft 30 may be configured as a straight channel, and the straight channel portion may be inclined relative to the central axis of the crankshaft 30 .

[0071] Furthermore, in this embodiment, if Figure 7As shown, the central axis of the straight channel section 121 of the distribution oil channel can be set to be parallel to the central axis of the main shaft 10, or the straight channel section 121 can be set to be inclined relative to the central axis of the main shaft 10. Specifically, the central axis of the straight channel section 121 can be set to coincide with the central axis of the main shaft 10, so that when the distribution oil channel 12 is processed and manufactured, the positioning of the channel start end is more convenient.

[0072] The crankshafts of the above-mentioned embodiments of the present invention can stably and reliably provide lubricating oil during forward rotation and reverse rotation, and can also ensure sufficient supply of lubricating oil during high-speed or low-speed rotation, so that the variable frequency compressor using the crankshaft can operate efficiently and reliably under high-frequency and low-frequency conditions, and the variable frequency operation of the variable frequency compressor is more stable and can save more energy.

[0073] Another embodiment of the present invention further provides a variable frequency compressor, comprising the above-mentioned crankshaft.

[0074] The variable frequency compressor provided by the embodiment of the present invention uses the above crankshaft, so that the manufacturing cost of the variable frequency compressor is reduced, and when the variable frequency compressor works under low frequency conditions, it can supply a sufficient amount of lubricating oil to ensure the efficient operation of the compressor. In this way, the compressor can ensure stable oil supply under low frequency, medium frequency and high frequency conditions, and the operation of the compressor is more stable and efficient. In addition, the variable frequency compressor also has other technical effects of the crankshaft provided by the above embodiments, which will not be repeated here.

[0075] Another embodiment of the present invention further provides a refrigeration device, which includes the above-mentioned variable frequency compressor.

[0076] The refrigeration equipment provided by the embodiment of the present invention uses the variable frequency compressor of the above embodiments, so the manufacturing cost of the refrigeration equipment is reduced, and the operation of the refrigeration equipment is more stable, the refrigeration effect is more stable, the operation energy consumption is lower, and the service life is longer. In addition, the refrigeration equipment also has other technical effects of the variable frequency compressor provided by the above embodiments, which will not be repeated here.

[0077] In a specific embodiment, the above-mentioned refrigeration equipment may be a refrigerator, an air conditioner, etc.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crankshaft, comprising a main shaft, a crankshaft and a crank, wherein the crankshaft is mounted on one end of the main shaft through the crank, characterized in that: An oil suction cavity is provided at one end of the main shaft away from the crankshaft, and an oil distribution channel is provided at the other end of the main shaft connected to the crankshaft, and the distribution oil channel extends from the end away from the oil suction cavity to penetrate the crankshaft; a first spiral oil groove and a second spiral oil groove of opposite rotation directions are provided on the outer peripheral wall of the main shaft, and one end of the first spiral oil groove and the second spiral oil groove are connected to the oil suction cavity, and the main shaft is also provided with a first oil hole and a second oil hole, the other end of the first spiral oil groove is connected to the distribution oil channel through the first oil hole, and the other end of the second spiral oil groove is connected to the distribution oil channel through the second oil hole, and a plane extending radially along the main shaft is used as a projection plane, and an angle θ between the center axis of the first oil hole and the center axis of the second oil hole in the projection plane is 25°<θ<155°.

2. The crankshaft according to claim 1, characterized in that The first oil hole and the second oil hole are located at any position of the peripheral wall of the distribution oil passage.

3. The crankshaft according to claim 2, characterized in that The first oil hole and the second oil hole are located on different sides of the peripheral wall of the oil distribution channel, or the first oil hole and the second oil hole are located on the same side of the peripheral wall of the oil distribution channel.

4. The crankshaft according to claim 1, characterized in that The first oil hole and the second oil hole are arranged at the same height along the central axis direction of the main shaft.

5. The crankshaft according to claim 1, characterized in that The first oil hole and the second oil hole are arranged at different heights along the central axis direction of the main shaft, and the height of the top of the second oil hole is lower than or equal to the height of the bottom of the first oil hole.

6. The crankshaft according to claim 1, characterized in that The main shaft is further provided with a third oil hole, and the first spiral oil groove and the second spiral oil groove are connected with the oil suction inner cavity through the third oil hole.

7. The crankshaft according to claim 6, characterized in that The number of the third oil hole is one, and the first spiral oil groove and the second spiral oil groove are connected to the oil suction inner cavity through the same third oil hole; Alternatively, the number of the third oil holes is two, and the first spiral oil groove and the second spiral oil groove are respectively connected to the oil suction inner cavity through two different third oil holes.

8. The crankshaft according to claim 1, characterized in that The first spiral oil groove and the second spiral oil groove have different rotation pitches.

9. The crankshaft according to claim 1, characterized in that The first spiral oil groove and the second spiral oil groove are respectively arranged on two opposite sides of the main shaft.

10. The crankshaft according to any one of claims 1 to 9, characterized in that: The oil distribution channel is a straight channel, and the central axis of the oil distribution channel is parallel to the central axis of the main shaft; Alternatively, the central axis of the oil distribution channel coincides with the central axis of the main shaft; Alternatively, the distribution oil channel is arranged to be inclined relative to the central axis of the main shaft.

11. The crankshaft according to any one of claims 1 to 9, characterized in that: The section of the distribution oil passage located on the main shaft is a straight passage section, and the section of the distribution oil passage located on the crankshaft is an arc-shaped passage section that is bent away from the main shaft.

12. The crankshaft according to claim 11, characterized in that The central axis of the straight channel section is parallel to the central axis of the main shaft; Alternatively, the central axis of the straight channel section coincides with the central axis of the main shaft; Alternatively, the straight channel section is arranged to be inclined relative to the central axis of the main shaft.

13. A variable frequency compressor, characterized in that: A crankshaft comprising any one of claims 1 to 12.

14. A refrigeration device, characterized in that: Including the variable frequency compressor as claimed in claim 13.

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