CN115199505A - Crankshaft, variable frequency compressor and refrigeration equipment - Google Patents

Abstract

The invention belongs to the technical field of compressors, and particularly relates to a crankshaft, a variable frequency compressor and refrigeration equipment. The crankshaft comprises a main shaft, a crankshaft and a crank, the crankshaft is installed at one end of the main shaft through the crank, an oil suction inner cavity and a distribution oil duct which penetrates through the crankshaft are arranged in the main shaft, a first spiral oil groove and a second spiral oil groove are formed in the outer wall surface of the main shaft, one end of the first spiral oil groove is communicated with the oil suction inner cavity, a first oil hole and a second oil hole are further formed in the main shaft, and the first spiral oil groove and the second spiral oil groove are communicated with the distribution oil duct through the first oil hole and the second oil hole respectively. First, second spiral oil groove revolve to opposite, and the homoenergetic supplies lubricating oil when guaranteeing bent axle forward and reverse rotation, and first oilhole and second oilhole interval set up and radially stagger each other along the main shaft, and lubricating oil reveals and the volume that falls back through first/second oilhole reduces, and the bent axle is oiled more securely at low-speed, and lubricating oil supplies more reliable and more stable.

Description

Crankshaft, variable frequency compressor and refrigeration equipment

Technical Field

The invention belongs to the technical field of compressors, and particularly relates to a crankshaft, a variable frequency compressor and refrigeration equipment.

Background

The crankshaft is one of the most important parts in various compressors, and bears the force transmitted by the connecting rod, converts the force into torque output and drives other accessories of the compressor to work. Generally, a crankshaft includes a main shaft, a crank, and a crank shaft, wherein the main shaft is provided with an oil groove, the oil groove and other cavities and holes arranged on the main shaft and the crank shaft form an oil supply system of the crankshaft, and the oil supply system is used for introducing lubricating oil such as engine oil into or out of the crank shaft, so that a lubricating oil film is formed on the surface of a movable part such as the crank shaft, so as to lubricate each movable part, and ensure that the movable part such as the crank shaft can flexibly operate, thereby efficiently transmitting torque. In the field of compressors, the variable frequency compressor can continuously change output energy, can stably run under the working conditions of low rotating speed and low energy consumption, has the advantages of high working efficiency, stable running and low energy consumption, and is widely applied to electrical appliances such as refrigerators, air conditioners and the like.

However, for the inverter compressor, because frequent frequency conversion and capacity change are required, the compressor is required to be capable of completing efficient operation at high rotation speed and low rotation speed, and in the process, not only is the oil supply system of the crankshaft required to stably supply oil under the working conditions of forward rotation and reverse rotation of the compressor, but also the oil supply system of the crankshaft is required to have stable and reliable low-speed oil supply capacity, so that the inverter compressor is ensured to be capable of keeping efficient operation under the working conditions of low frequency and low capacity.

In the related art, in order to improve the oil supply capacity of the inverter compressor at a low rotation speed, a commonly adopted means is to increase the lift of an oil pump for pumping lubricating oil or add a micro pump and the like in a crankshaft to make up for the reduction of the centrifugal force of the lubricating oil ascending at the low rotation speed, so as to ensure the oil supply amount of the lubricating oil at the low rotation speed, however, the processing mode can increase the manufacturing cost of the inverter compressor and is contradictory to the cost control of the inverter compressor.

Disclosure of Invention

The embodiment of the invention mainly aims to provide a crankshaft, an inverter compressor and refrigeration equipment, and aims to solve the technical problem that the manufacturing cost of the inverter compressor is increased by taking measures of increasing the oil pump lift or adding a micro pump to increase the supply of lubricating oil at low rotating speed in the inverter compressor in the prior art.

In order to achieve the above purpose of the present invention, a lubricating oil system is required to be installed on the crankshaft based on the compressor, and meanwhile, since the compressor may have two rotation operation conditions of forward rotation and reverse rotation, especially for the inverter compressor, the forward rotation and the reverse rotation are associated with the frequency modulation and speed regulation of the compressor, so that the lubricating oil supply at the low rotation speed of the inverter compressor needs to be increased, and the lubricating oil supply at the forward rotation condition and the reverse rotation condition of the compressor needs to be satisfied first, that is, the lubricating oil can be oiled in a flowing manner under the forward rotation condition and the reverse rotation condition of the compressor. On the basis, the inventor further researches the oiling amount of the lubricating oil at a low rotating speed, designs various lubricating oil supply systems capable of stably supplying the lubricating oil under the working conditions of forward rotation and reverse rotation, respectively tests each system, and provides the following technical scheme based on the test result.

The technical scheme adopted by the invention is as follows: the crankshaft is arranged at one end of the main shaft through the crank, an oil absorption inner cavity is formed in one end, away from the crankshaft, of the main shaft, a distribution oil duct is formed in the other end, connected with the crankshaft, of the main shaft, and one end, away from the oil absorption inner cavity, of the distribution oil duct extends to penetrate through the crankshaft; the main shaft is further provided with a first oil hole and a second oil hole, the other end of the first spiral oil groove is communicated with the distribution oil duct through the first oil hole, the other end of the second spiral oil groove is communicated with the distribution oil duct through the second oil hole, and a plane extending along the radial direction of the main shaft is taken as a projection plane, and an included angle theta between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is 25 degrees < theta <155 degrees.

In some embodiments, the first oil hole and the second oil hole are located at arbitrary positions of the distribution oil passage peripheral wall.

In some embodiments, the first oil hole and the second oil hole are located on different sides of the distribution oil passage circumferential wall, or the first oil hole and the second oil hole are located on the same side of the distribution oil passage circumferential wall.

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.

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

In some embodiments, the main shaft is further provided with a third oil hole, and the first helical oil groove and the second helical oil groove are communicated with the oil suction inner cavity through the third oil hole.

In some embodiments, the number of the third oil holes is one, and the first helical oil groove and the second helical oil groove are communicated with the oil suction inner cavity through the same third oil hole;

or the number of the third oil holes is two, and the first spiral oil groove and the second spiral oil groove are respectively communicated with the oil absorption inner cavity through two different third oil holes.

In some embodiments, the first helical oil groove and the second helical oil groove have different rotational pitches.

In some embodiments, the first helical oil groove and the second helical oil groove are disposed on opposite sides of the main shaft.

In some embodiments, the distribution oil passage is a straight passage, and a central axis of the distribution oil passage is parallel to a central axis of the main shaft;

or the central shaft of the distribution oil channel is superposed with the central shaft of the main shaft;

alternatively, the distribution oil passage is disposed obliquely with respect to the central axis of the main shaft.

In some embodiments, a section of the distribution oil passage located at the main shaft is a straight passage section, and a section of the distribution oil passage located at the crank shaft is an arc-shaped passage section bent away from the main shaft.

In some embodiments, the central axis of the straight channel section is parallel to the central axis of the main shaft;

or the central axis of the straight channel section is superposed with the central axis of the main shaft;

alternatively, the straight channel section is arranged obliquely with respect to the central axis of the spindle.

One or more technical schemes in the crankshaft provided by the embodiment of the invention at least have one of the following technical effects: compared with the prior art, the crankshaft ensures that the lubricating oil can be supplied to a compressor using the crankshaft through the first spiral oil groove and the second spiral oil groove respectively during forward rotation and reverse rotation by arranging the first spiral oil groove and the second spiral oil groove which are opposite in rotation direction on the main shaft. Meanwhile, a first oil hole is formed in the main shaft to conduct the first spiral oil groove and the distribution oil passage, a second oil hole is formed in the distribution oil passage to conduct the second spiral oil groove, the plane extending along the radial direction of the main shaft serves as a projection plane, an included angle theta between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is larger than 25 degrees, the first oil hole and the second oil hole are guaranteed to be separated from each other, lubricating oil flowing out of the first oil hole is prevented from directly falling back through the second oil outlet hole, the included angle theta between the central axis of the first oil hole and the central axis of the second oil hole in the projection plane is smaller than 155 degrees, the first oil hole and the second oil hole are staggered from each other and are not opposite to each other along the radial direction of the main shaft, and the lubricating oil flowing out of the first oil hole is prevented from being thrown into the second oil hole under the action of centrifugal force and falling back. So, can reduce the volume that lubricating oil that gets into the distribution oil duct reveals and fall back through second oilhole (or first oilhole), especially to the compressor of work under the low frequency operating mode, the reduction of lubricating oil volume of falling back provides better guarantee for low-speed oiling to guarantee still have sufficient lubricating oil under the low-speed rotation and can follow the output of crank axle through the distribution oil duct, guarantee the stable fuel feeding of low-speed. And the crankshaft is optimally designed through the structure of the crankshaft to improve the supply amount of the lubricating oil at a low rotating speed, the lift of an oil pump is not required to be increased or a micro pump is not required to be additionally arranged, and the manufacturing cost of the variable frequency compressor using the crankshaft is reduced.

The other technical scheme of the invention is as follows: an inverter compressor is provided, which comprises the crankshaft.

The variable frequency compressor provided by the embodiment of the invention has the beneficial effects that: compared with the prior art, the variable frequency compressor has the advantages that by using the crankshaft, the manufacturing cost of the variable frequency compressor is reduced, sufficient lubricating oil can be supplied when the variable frequency compressor works under the low-frequency working condition, the efficient operation of the compressor is ensured, stable oil supply can be ensured under the low-frequency, medium-frequency and high-frequency working conditions of the variable frequency compressor, and the operation of the compressor is more stable and efficient.

The invention adopts another technical scheme that: a refrigeration device is provided, and the refrigeration device comprises the inverter compressor.

The refrigeration equipment provided by the embodiment of the invention has the beneficial effects that: compared with the prior art, the refrigeration equipment has the advantages that due to the adoption of the variable-frequency compressor, the manufacturing cost of the refrigeration equipment is reduced, the refrigeration equipment is more stable in operation, the refrigeration effect is more stable, the operation energy consumption is lower, and the service life is longer.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a crankshaft according to an embodiment of the present invention;

FIG. 2 is a front view of the crankshaft of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic front view of a crankshaft according to another embodiment of the present invention;

FIG. 5 is a first schematic view showing a positional relationship between the first oil hole and the second oil hole of the spindle according to the first embodiment of the present invention;

FIG. 6 is a second schematic view showing a positional relationship between the first oil hole and the second oil hole of the main shaft according to another embodiment of the present invention;

fig. 7 is a front view schematically illustrating a crankshaft according to still another embodiment of the present invention.

In the figures, the various figures are mainly marked:

10. a main shaft; 11. an oil absorption inner cavity; 12. a distribution oil passage; 121. a straight channel section; 122. an arcuate channel section; 13. a first helical oil groove; 14. a second helical oil groove; 15. a first oil hole; 151. a first rotary hole; 16. a second oil hole; 161. a second rotary hole; 17. a third oil hole; 20. a crank; 30. a crank shaft; 31. an oil outlet.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the present invention will be further described in detail with reference to fig. 1 to 7 and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship as shown in the figures, which is for convenience in describing the invention and to simplify the description, and that does not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and is not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. The features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Reference in the specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. The appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like in various places in the specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Generally, a common compressor generally includes a housing, a crankcase, a crankshaft, an oil pump, a connecting rod, a piston pin, a valve set, a driving motor, and the like, wherein an oil sump storing lubricating oil (also called refrigeration oil) is disposed at the bottom of the housing, the crankshaft includes a main shaft drivingly connected to the driving 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 an oil supply system) is generally disposed inside the crankshaft, the oil pump is mounted at the bottom of the crankshaft, and an oil outlet of the oil pump is communicated with the oil supply system inside the crankshaft. When the compressor works, the crankshaft rotates, at the moment, lubricating oil at the bottom of the shell can be conveyed through the oil supply system and guided to each friction pair of the compressor for lubrication by utilizing the centrifugal force generated when the crankshaft rotates and matching with the pumping pressure of the oil pump, so that the friction loss during operation among all parts in the compressor is reduced, and meanwhile, the lubricating oil also has a certain cooling effect, so that the oil feeding amount of the crankshaft has important influence on the normal operation of the compressor.

For the inverter compressor, the output driving energy can be adjusted by continuously changing the running speed according to the working requirement, the lower the rotating speed is, the lower the power consumption is, therefore, the inverter compressor has the advantages of high efficiency and energy saving, and thus, in order to ensure good operation effect and reduce the abrasion of each friction pair, the rotating speed of the inverter compressor is always controlled to be about 1200rpm to 6000 rpm. Under the higher rotational speed, the bent axle has higher rotational speed to can provide the great centrifugal lift of lubricating oil, thereby guarantee the sufficient supply of lubricating oil, and when the rotational speed reduced, the rotational speed of bent axle reduced, and the centrifugal lift who provides lubricating oil reduces, thereby leads to the supply of lubricating oil not enough, and the friction pair can not obtain effective lubrication, and the operating mode of inverter compressor under low rotational speed is bad.

Because the frequency conversion compressor can have two kinds of rotation operating mode of forward rotation and reverse rotation, the oil feeding system that the event bent axle set up needs to satisfy the frequency conversion compressor and supply with along the lubricating oil under these two kinds of operating mode of clockwise forward rotation and along anticlockwise reverse rotation, ensures promptly that lubricating oil all can oil under frequency conversion compressor corotation and reversal operating mode, supplies with the vice lubrication of friction. On the basis, the embodiment of the invention further optimizes the design of the crankshaft of the variable frequency compressor, improves the oiling amount of lubricating oil of the crankshaft at low rotating speed, provides a lubricating oil supply system capable of stably supplying oil under the working conditions of forward rotation and reverse rotation, and is described in detail with reference to specific embodiments.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a crankshaft according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a front view of the crankshaft according to the embodiment, and a partial structure of the schematic structural diagram is a perspective structure so as to show a flow path of a lubricating oil. The crankshaft provided by the embodiment can realize stable oil supply under low-speed, medium-speed and high-speed rotation, and is suitable for being installed in a compressor, particularly a frequency conversion compressor.

Specifically, as shown in fig. 1 and 2, the embodiment of the present invention provides a crankshaft including a main shaft 10 for driving connection with an external driving part, a crank shaft 30 installed at a first end of the main shaft 10, and a crank 20 connecting the main shaft 10 and the crank shaft 30. The crankshaft 30 is eccentrically disposed relative to a central axis (as shown by a line R in fig. 2) of the main shaft 10, one end of the main shaft 100 is provided with an oil suction cavity 11, one end of the oil suction cavity 11, which is away from the crankshaft 30, is disposed and extends along the central axis direction of the main shaft 10, the other end of the main shaft 10, which is connected to the crankshaft 30, is provided with a distribution oil passage 12, the distribution oil passage 12 extends along the central axis of the main shaft 10, and one end of the distribution oil passage 12, which is away from the oil suction cavity 11, extends to penetrate through the crankshaft 30. Wherein, the one end that the oil absorption inner chamber 11 deviates from crank 20 opens and sets up in order to be used for with the oil-out intercommunication of oil pump, distribution oil duct 12 is linked together with oil absorption inner chamber 11 and is used for exporting lubricating oil from the bent axle, makes lubricating oil reach each running part of compressor inside and lubricate, ensures that each running part homoenergetic of the compressor of the bent axle of using this embodiment can normal operating to play cooling's effect to each spare part.

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, which are opposite in rotation direction, in the present embodiment, the first spiral oil groove 13 is spirally arranged in a counterclockwise direction (as shown by an arrow R1 in fig. 1), and the second spiral oil groove 14 is spirally arranged in a clockwise direction (as shown by an arrow R2 in fig. 1). First helical oil groove 13 and second helical oil groove 14 all have relative first end and the second end that sets up, and first end all faces the bottom of main shaft 10, the second end all faces the top of main shaft 10, wherein, first end of first helical oil groove 13 and second helical oil groove 14 all communicates with oil absorption inner chamber 11, the top of main shaft 10 still is equipped with first oilhole 15 and second oilhole 16, the second end of first helical oil groove 13 communicates with distribution oil duct 12 through first oilhole 15, the second end of second helical oil groove 14 communicates with distribution oil duct 12 through second oilhole 16, thereby make oil absorption inner chamber 11 communicate with distribution oil duct 12 through two helical oil grooves respectively. In this way, since the first helical oil groove 13 is helically arranged in the counterclockwise direction, when the crankshaft rotates counterclockwise, the lubricating oil pumped into the oil suction chamber 11 by the oil pump enters the first helical oil groove 13 communicated therewith, and rises from the first end to the second end by the centrifugal force generated by the counterclockwise rotation of the main shaft 10 and passes through the first oil hole 15 into the distribution oil passage 12, and further flows out from the distribution oil passage 12 by the centrifugal force of the crankshaft 30. On the contrary, when the crankshaft rotates clockwise, the lubricating oil enters the second helical oil groove 14 from the oil suction inner cavity 11, rises from the first end to the second end thereof by the centrifugal force generated by the clockwise rotation of the main shaft 10, passes through the second oil hole 16 to enter the distributing oil passage 12, and then further flows out from the distributing oil passage 12 by the centrifugal force of the crankshaft 30. In this way, the compressor using the crankshaft of the present embodiment respectively uses the main shaft 10 to rotate to the different first helical oil groove 13 and second helical oil groove 14 to oil normally under the working conditions of forward rotation and reverse rotation, so as to supply lubricating oil under the working conditions of different rotation directions.

Further, please refer to fig. 3, wherein fig. 3 isbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A line in fig. 2. In the present embodiment, a plane extending in the radial direction of the main shaft 10 is taken as a projection plane, and an included angle between the central axis of the first oil hole 15 (shown by L1 in fig. 3) and the central axis of the second oil hole 16 (shown by L2 in fig. 3) on the projection plane is θ, and θ is greater than 25 ° and smaller than 155 °. It should be noted that, because a certain thickness dimension exists between the peripheral 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 deflect toward the inside of the main shaft 10 and penetrate through the portion between the peripheral wall of the main shaft 10 and the peripheral wall of the distribution oil passage 12 before being communicated with the first oil hole 15 and the second oil hole 16, respectively, so that a first turning hole 151 is formed at a position where the first spiral oil groove 13 is connected with the first oil hole 15, and a second turning hole 161 is formed at a position where the second spiral oil groove 14 is connected with the second oil hole 16, as shown in fig. 1 and 3. In the present embodiment, the first oil hole 15 and the second oil hole 16 are openings in the circumferential wall of the distribution oil passage 12.

In this way, by setting the included angle θ to satisfy θ >25 °, the gap between the two oil holes is ensured, and as shown in fig. 4, the lubricating oil flowing out of the first oil hole 15 does not directly fall back through the second oil hole 16. And satisfy theta through setting up contained angle theta and <155, along the radial of main shaft 10, two oilholes stagger each other and do not just right each other to can effectively avoid the lubricating oil that flows out from first oilhole 15 to fly under the centrifugal force effect and get rid of to get into second oilhole 16 and take place to fall back. In this way, the amount of lubricating oil entering the distribution oil passage 12 leaking and falling back through the second oil hole 16 (or the first oil hole 15) can be reduced, and especially for a compressor working under a low-frequency working condition, the reduction of the amount of lubricating oil falling back provides a better guarantee for low-speed oiling, so that enough lubricating oil can still be output from the crankshaft 30 through the distribution oil passage 12 at a low rotating speed, and stable low-speed oiling is ensured. In addition, because the first oil hole 15 and the second oil hole 16 are arranged at intervals or staggered, the crankshaft of the embodiment can ensure sufficient supply of lubricating oil by arranging one distribution oil passage 12, two independent distribution oil passages 12 are not required to be arranged and are respectively communicated with the first oil hole 15 and the second oil hole 16, the processing and manufacturing difficulty of the crankshaft is reduced, and the strength of the crankshaft is further ensured.

In some specific embodiments, the included angle θ may be 30 °, 45 °, 60 °, 75 °, 90 °, 120 °, 145 °, 150 °, or the like, and may be selected as needed in specific design, where a value of the included angle θ is not limited uniquely.

In another embodiment of the present invention, please refer to fig. 3 and 4, further explaining the positions of the first oil holes 15 and the second oil holes 16 in the embodiment. Fig. 4 is a schematic front view of the crankshaft of the present embodiment, and a part of the structure in the figure is a perspective structure so as to show a flow path of the lubricating oil. In the embodiment of the present invention, the first oil hole 15 and the second oil hole 16 may be located at any position of the circumferential wall of the distribution oil passage 12, as long as the arrangement heights of the two oil holes along the central axis of the main shaft 10 are different.

In some embodiments, as shown in fig. 2, the first oil hole 15 and the second oil hole 16 are respectively located at two opposite or adjacent sides of the circumferential wall of the distribution oil passage 12, that is, the two oil holes are located at two different sides of the circumferential wall of the distribution oil passage 12, and at this time, the first helical oil groove 13 and the second helical oil groove 14 are respectively located at two different sides of the circumferential wall of the distribution oil passage 12 to enter the distribution oil passage 12, so that the two helical oil grooves can be respectively located at two opposite sides of the main shaft 10 along the radial direction of the main shaft 10 and can be approximately symmetrically arranged at the outer circumferential wall of the main shaft 10, and since the grooves formed in the outer circumferential wall of the main shaft 10 can affect the overall strength of the main shaft 10, the two helical oil grooves are approximately symmetrically arranged at two sides of the main shaft 10, and can reduce the influence of the oil grooves on the overall strength of the main shaft 10 as much as possible.

In other embodiments, as shown in fig. 4, the first oil hole 15 and the second oil hole 16 may be located on the same side of the circumferential wall of the distribution oil passage 12, and in this case, the extension length of one of the oil grooves may be set longer, so that when the crankshaft has a higher rotation speed in a certain rotation direction, the crankshaft needs to provide a larger supply amount of lubricating oil in the rotation direction, and correspondingly, the length of the oil groove corresponding to the rotation direction is set longer, so that the supply amount of lubricating oil in the direction can be increased. For example, in one embodiment, when the crankshaft rotates at a higher speed in the counterclockwise direction, the first oil groove 13 is provided to be longer than the second oil groove 14, and the amount of lubricating oil supplied through the first oil groove 13 when the crankshaft rotates in the counterclockwise direction is larger, which is more advantageous for lubricating the crankshaft and other operating parts of the compressor using the crankshaft.

Please further refer to fig. 5 and 6, wherein fig. 5 and 6 are schematic diagrams illustrating the position relationship between the first oil hole 15 and the second oil hole 16 of the main shaft 10 according to two different embodiments. The arrangement of the included angle between the central axis of the first oil hole 15 and the central axis of the second oil hole 16 on the projection plane will be described below with reference to the specific arrangement positions of the two oil holes.

Specifically, as shown in fig. 5, when the first oil hole 15 and the second oil hole 16 are on the same side or adjacent to both sides of the circumferential wall of the distribution oil passage 12, θ >25 ° is provided to ensure that the two oil holes are staggered from each other in the axial direction of the main shaft 10 (as shown by the dotted line in fig. 5), and when the crankshaft 10 rotates at a low speed, the centrifugal force applied to the lubricating oil is relatively small, and at this time, most of the lubricating oil is transported in the axial direction of the main shaft 10 under the pumping pressure of the oil pump, and continues to flow in the direction indicated by the arrow in fig. 5 after flowing out from the corresponding oil hole, and the two oil holes are staggered from each other in the axial direction of the main shaft 10, so that the lubricating oil flowing out in the axial direction is prevented from leaking again when rising along the passage wall of the distribution oil passage 12. When the first oil hole 15 and the second oil hole 16 are located on opposite sides of the circumferential wall of the distribution oil passage 12, θ <155 ° is set, as shown in fig. 6, to ensure that the two oil holes are staggered with each other in the radial direction of the main shaft 10 (as shown by a dotted line in fig. 6), 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 by the centrifugal force, and continues to flow in the direction shown by the arrow in fig. 6 after flowing out, and the two oil holes are staggered in the radial direction of the main shaft 10, so that the lubricating oil flowing out in the radial direction is prevented from leaking when rising along the inner wall of the distribution oil passage 12.

In another embodiment of the present invention, please continue to refer to fig. 3, an intersection point of the central axis of the first oil hole 15 and the central axis of the second oil hole 16 on the projection plane is located on the rotation axis of the main shaft 10, and when the main shaft 10 rotates, centrifugal forces applied to the lubricating oil at the first oil hole 15 and the second oil hole 16 are substantially equal, so that the two oil holes arranged in a staggered manner can enable most of the lubricating oil to flow out of the crankshaft 30 through the distribution oil passage 12, thereby ensuring the supply amount of the lubricating oil.

It is understood that in other embodiments, the intersection point of the central axes of the two oil holes on the projection plane may be offset from the rotation axis of the main shaft 10, and the centrifugal force applied to the lubricating oil at the two oil holes is not equal when the main shaft 10 rotates. When the crankshaft has a higher rotational speed in a certain rotational direction, it contributes to an increase in the supply of lubricating oil in that direction by increasing the centrifugal force to which the lubricating oil is subjected at the oil holes in that rotational direction.

In another embodiment of the present invention, referring to fig. 1 and fig. 2, in the present embodiment, the heights of the second oil holes 16 of the first oil holes 15 disposed along the central axis direction of the main shaft 10 are the same or different, wherein the same height means: 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 height difference means: the orifice top of the first oil hole 15 is lower than the orifice top of the second oil hole 16, and the orifice bottom of the first oil hole 15 is lower than the orifice bottom of the second oil hole 16, i.e., the two oil holes are staggered in the axial direction of the main shaft 10.

In some specific embodiments, the orifice top of the first oil hole 15 is lower than the orifice bottom of the second oil hole 16, or the orifice top of the first oil hole 15 and the orifice bottom of the second oil hole 16 are located on the same line along the radial direction of the main shaft 10, that is, the first oil hole 15 and the second oil hole 16 are completely staggered in the axial direction of the main shaft 10, so that the leakage amount of the lubricating oil through the first oil hole 15 or the second oil hole 16 is further reduced, and the sufficient supply of the lubricating oil is better ensured.

In another embodiment of the present invention, referring to fig. 1 and fig. 2, a third oil hole 17 is further disposed at a bottom end of the main shaft 10, the third oil hole 17 penetrates through the oil absorption inner cavity 11, the first helical oil groove 13 and the second helical oil groove 14 are communicated with the oil absorption inner cavity 11 through the third oil hole 17, and the lubricating oil in the oil absorption inner cavity 11 can enter the first helical oil groove 13 and the second helical oil groove 14 through the third oil hole 17 under the pressure action of the oil pump.

In some embodiments, as shown in fig. 1, a third oil hole 17 may be disposed on the main shaft 10, and the two helical oil grooves are communicated with the oil absorption inner cavity 11 through the same third oil hole 17, so that only one third oil hole 17 is disposed on the main shaft 10, which reduces the processing steps of the main shaft 10, reduces the processing difficulty, and improves the production precision and efficiency of the main shaft 10.

In other specific embodiments (not shown), two third oil holes 17 may also be formed in the main shaft 10, and the two spiral oil grooves are communicated with the oil absorption inner cavity 11 through the different third oil holes 17, so that the two spiral oil grooves are independently communicated with the oil absorption inner cavity 11, the oiling process is not affected, and for some main shafts 10 with large size and relatively low difficulty in machining the two third oil holes 17, the design may be designed in this way.

In another embodiment of the present invention, the first oil helical groove 13 and the second oil helical groove 14 have different pitches of rotation, and when the crankshaft has a higher rotation speed in a certain rotation direction, the crankshaft needs to provide a larger amount of lubricant oil supply in the rotation direction, so by setting the pitches of the first oil helical groove 13 and the second oil helical groove 14 to be different, the extension length of one of the first oil helical groove 13 and the second oil helical groove 14 can be set longer to match the rotation speed of the crankshaft in the direction, thereby increasing the supply amount of lubricant oil in the large rotation direction and avoiding the occurrence of a significant excessive supply of lubricant oil in the small rotation direction.

It is understood that the pitch of the rotating thread of the two spiral oil grooves can be set equal, when the crankshaft rotates in the forward direction or the reverse direction and the rotating speed is approximately equal, the amount of the lubricating oil supplied by the two spiral oil grooves is approximately equal, and the oil supply control is more convenient.

In another embodiment of the present invention, referring to fig. 2 and 4, the distribution oil passage 12 of the present embodiment is a straight passage, the top of the crankshaft 30 is provided with an oil outlet hole 31, the distribution oil passage 12 penetrates through the oil outlet hole 31, and the lubricating oil flows out from the top of the crankshaft 30 through the distribution oil passage 12 and finally reaches the inside of the compressor using the crankshaft of the present embodiment, and effectively lubricates various operating components.

In the specific embodiment, the central axis of the distribution oil passage 12 is provided parallel to the central axis of the main shaft 10, or the distribution oil passage 12 may be provided obliquely with respect to the central axis of the main shaft 10. Specifically, the central axis of the distribution oil passage 12 may be provided to coincide with the central axis of the main shaft 10, as shown in fig. 2 and 4, so that the passage positioning is more convenient when the distribution oil passage 12 is machined and manufactured.

In another embodiment of the present invention, please refer to fig. 7, fig. 7 is a front structural view of a crankshaft according to another embodiment of the present invention, and a partial structure of the front structural view is a perspective structure in order to illustrate a flow path of lubricating oil. In this embodiment, a section of the upper oil passage 12 located on the main shaft 10 is a straight passage section 121, a section of the upper oil passage 12 located on the crankshaft 30 is an arc-shaped passage section 122 bent away from the main shaft 10, an oil outlet hole 31 is formed in a side wall of the crankshaft 30, and the arc-shaped passage section 122 penetrates through the oil outlet hole 31. When the crankshaft rotates at a high speed, the oil outlet manner of the lubricating oil flowing out from the top of the crankshaft may cause the oil outlet position to be higher, which is inconvenient for lubricating a piston or the like disposed at a relatively lower position in the compressor, and therefore, the oil outlet hole 31 is formed in the side wall of the crankshaft 30, and the distribution oil passage 12 is disposed to be an arc-shaped passage 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 to better lubricate the piston or the like. In addition, the passage structure deviating from the arc bending of the main shaft 10 can well utilize the centrifugal force generated when the crank shaft 30 rotates, and the lubricant oil outflow rate is further ensured.

Of course, in other embodiments, the portion of the distribution oil passage 12 located on the crank shaft 30 may be provided in the form of a straight passage that is inclined with respect to the central axis of the crank shaft 30.

Further, in the present embodiment, as shown in fig. 7, the central axis of the distribution oil passage straight passage section 121 may be provided in parallel with the central axis of the main shaft 10, or the straight passage section 121 may be provided obliquely with respect to the central axis of the main shaft 10. Specifically, the central axis of the straight passage section 121 may be arranged to coincide with the central axis of the main shaft 10, so that the start of the passage is more conveniently positioned when the distribution oil passage 12 is manufactured.

The crankshaft of each embodiment of the invention can stably and reliably provide lubricating oil during forward rotation and reverse rotation, and can ensure sufficient supply of the lubricating oil during high-speed or low-speed rotation, so that the variable frequency compressor using the crankshaft can efficiently and reliably operate under high-frequency and low-frequency working conditions, the variable frequency operation of the variable frequency compressor is more stable, and the energy consumption can be more saved.

The invention further provides an inverter compressor, which comprises the crankshaft.

According to the variable frequency compressor provided by the embodiment of the invention, by using the crankshaft, the manufacturing cost of the variable frequency compressor is reduced, and when the variable frequency compressor works under a low-frequency working condition, enough lubricating oil can be supplied to ensure the high-efficiency operation of the compressor, so that the compressor can ensure stable oil supply under low-frequency, medium-frequency and high-frequency working conditions, and the operation of the compressor is more stable and efficient. In addition, the inverter compressor also has other technical effects of the crankshaft provided by the above embodiments, and details are not repeated here.

The invention further provides refrigeration equipment which comprises the inverter compressor.

According to the refrigeration equipment provided by the embodiment of the invention, due to the adoption of the variable frequency compressors of the embodiments, the manufacturing cost of the refrigeration equipment is reduced, 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 inverter compressor provided by the above embodiments, and details are not described here.

In a specific embodiment, the refrigeration device may be a refrigerator, an air conditioner, or the like.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (14)

1. A crankshaft comprises a main shaft, a crankshaft and a crank, wherein the crankshaft is arranged at one end of the main shaft through the crank; be equipped with on the periphery wall of main shaft and revolve to opposite first spiral oil groove and second spiral oil groove, first spiral oil groove with the one end of second spiral oil groove with oil absorption inner chamber intercommunication, the main shaft still is equipped with first oilhole and second oilhole, first spiral oil groove's the other end passes through first oilhole with distribution oil duct intercommunication, second spiral oil groove's the other end passes through the second oilhole with distribution oil duct intercommunication, and with the edge the plane of the radial extension of main shaft is the projection plane, the axis of first oilhole with the axis of second oilhole is in projection plane's contained angle theta is 25 < theta < 155.

2. The crankshaft according to claim 1, wherein the first oil hole and the second oil hole are located at arbitrary positions of the distribution oil passage peripheral wall.

3. A crankshaft according to claim 2, wherein the first oil hole and the second oil hole are located on different sides of the distribution oil passage circumferential wall, or the first oil hole and the second oil hole are located on the same side of the distribution oil passage circumferential wall.

4. The crankshaft of claim 1, wherein the first oil hole and the second oil hole are disposed at equal heights along a central axis direction of the main shaft.

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

6. The crankshaft of claim 1, wherein the main shaft is further provided with a third oil hole, and the first helical oil groove and the second helical oil groove are communicated with the oil suction inner cavity through the third oil hole.

7. The crankshaft as claimed in claim 6, wherein the number of the third oil holes is one, and the first helical oil groove and the second helical oil groove are communicated with the oil suction inner cavity through the same third oil hole;

or the number of the third oil holes is two, and the first spiral oil groove and the second spiral oil groove are respectively communicated with the oil absorption inner cavity through the two different third oil holes.

8. The crankshaft of claim 1, wherein a rotational pitch of said first helical oil groove and said second helical oil groove is different.

9. A crankshaft according to claim 1, wherein the first helical oil groove and the second helical oil groove are disposed on opposite sides of the main shaft.

10. A crankshaft according to any one of claims 1 to 9, wherein the distribution oil passage is a straight passage, and a central axis of the distribution oil passage is parallel to a central axis of the main shaft;

or the central axis of the distribution oil passage is superposed with the central axis of the main shaft;

alternatively, the distribution oil passage is disposed obliquely with respect to a central axis of the main shaft.

11. A crankshaft according to any one of claims 1 to 9, wherein the section of the distribution oil passage on the main shaft is a straight passage section, and the section of the distribution oil passage on the crankshaft is an arc-shaped passage section curved away from the main shaft.

12. A crankshaft according to claim 11, wherein the central axis of the straight channel section is parallel to the central axis of the main shaft;

or the central axis of the straight channel section is superposed with the central axis of the main shaft;

or the straight channel section is obliquely arranged relative to the central axis of the spindle.

13. An inverter compressor, characterized in that it comprises a crankshaft according to any one of claims 1 to 12.

14. Refrigeration plant, characterized in that it comprises an inverter compressor according to claim 13.

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