Scroll compressor

Abstract

This invention provides a scroll compressor, comprising a housing, a top cover, a scroll assembly, a support frame, and a crankshaft. An external oil reservoir is formed between the top cover and the scroll assembly, and the support frame forms an mounting cavity. The top cover has an oil reservoir and two top cover oil passages connecting the oil reservoir and the external oil reservoir. The scroll assembly and the support frame together form a first flow channel and a second flow channel leading to the mounting cavity and the bottom cavity, respectively. One of the two top cover oil passages is equipped with a floating mechanism, which can open or close the oil passage according to the change of lubricating oil level, dynamically adjusting the downward oil supply. It can adapt to different frequency operating conditions of the compressor: at high frequencies, it reduces oil carryover and ensures oil-gas separation effect; at low frequencies, it ensures that the lubricating oil can flow back to the oil reservoir in time and be stably supplied to the bearings to achieve effective lubrication. Without the need for complex external devices, it significantly improves the circulation efficiency of lubricating oil, reduces ineffective discharge of lubricating oil, and improves the operating efficiency and reliability of the compressor.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, and particularly relates to a scroll compressor. Background Technology

[0002] Scroll compressors are widely used in air conditioning, refrigeration, and industrial equipment due to their high efficiency and compact structure. However, with the continuous increase in their operating frequency, especially under high-frequency conditions, the lubricating oil supply and recovery system faces significant challenges: on the one hand, high-speed airflow easily carries a large amount of lubricating oil away from the compression chamber and into the exhaust area, making it difficult for the lubricating oil to be effectively separated and returned in a timely manner; on the other hand, the oil circuit design in existing structures often lacks an effective oil quantity adjustment and guidance mechanism, causing the lubricating oil to be unable to be dynamically distributed according to actual operating conditions, resulting in insufficient lubrication of key parts (such as crankshaft bearings and scroll plate contact surfaces), and even causing dry friction, seriously affecting the reliability and lifespan of the compressor. In addition, incompletely separated lubricating oil in traditional solutions is easily discharged with high-pressure gas, which not only wastes oil and reduces system energy efficiency, but may also pollute the subsequent condenser and the environment.

[0003] While existing technologies commonly employ oil-gas separators or external auxiliary oil pumps to enhance oil management, significant drawbacks remain: multi-stage oil-gas separators are complex, bulky, and costly, while external oil pumps increase energy consumption and control complexity. Especially under high-frequency, variable operating conditions, these systems exhibit sluggish response, making it difficult to achieve efficient lubricant recovery and precise supply, and failing to fundamentally solve the problem of dynamic balance in lubricant circulation. Summary of the Invention

[0004] In view of this, the present invention provides a scroll compressor to solve the problems of complex structure, large size and complex control required for lubricating oil circulation in existing compressors, and the inability to achieve efficient recovery and precise supply of lubricating oil under high-frequency operating conditions.

[0005] This invention provides a scroll compressor, comprising a housing, a top cover, a scroll assembly, a support frame, and a crankshaft; the housing encloses a housing cavity with an open top, and the top cover covers the top of the housing cavity; the scroll assembly and the support frame are arranged sequentially from top to bottom within the housing cavity; the support frame forms an mounting cavity and an upper shaft hole, and the bottom wall of the housing cavity forms a lower shaft hole; the upper end of the crankshaft passes through the upper shaft hole and enters the mounting cavity to drive the scroll assembly, and the lower end of the crankshaft is disposed within the lower shaft hole; the crankshaft is connected to both the upper and lower shaft holes via bearings;

[0006] The top cover has an air inlet, an upper exhaust chamber, an exhaust port, and an oil storage tank. The air inlet is used to deliver gas that has been acted upon by the vortex assembly to the upper exhaust chamber. The upper exhaust chamber is equipped with an oil-gas separator for separating lubricating oil from the gas. The exhaust port is used to discharge the separated gas. The oil storage tank is used to store the lubricating oil.

[0007] An external oil reservoir is formed between the vortex assembly and the top cover. The top cover has two oil passages that connect the oil reservoir and the external oil reservoir. The vortex assembly and the support frame together form a first flow channel and a second flow channel. The first flow channel connects the external oil reservoir and the mounting cavity, and the second flow channel connects the external oil reservoir and the bottom cavity. The bottom cavity is the space between the support frame and the bottom wall of the housing cavity.

[0008] One of the two top cover oil passages is equipped with a floating mechanism, which can open or close the top cover oil passage according to the change in the level of the lubricating oil in the top cover oil passage.

[0009] Further optionally, the two top cover oil passages include a first top cover oil passage and a second top cover oil passage; the first top cover oil passage is configured to be normally open, and the floating mechanism is provided in the second top cover oil passage;

[0010] The floating mechanism is configured to: close the second top cover oil passage when the level of lubricating oil in the second top cover oil passage is lower than or equal to a preset level; and open the second top cover oil passage when the level of lubricating oil in the second top cover oil passage is higher than the preset level.

[0011] Further optionally, the floating mechanism includes a cylinder and a float, the cylinder having an oil passage formed inside; the top of the cylinder has a top opening and the bottom has a bottom opening, the top opening connecting the top of the second top cover oil passage and the cylinder oil passage, and the bottom opening connecting the bottom of the second top cover oil passage and the cylinder oil passage.

[0012] The float is located at the top opening, and the float can open or close the top opening according to the change in the level of lubricating oil in the oil passage of the second top cover.

[0013] Optionally, the floating mechanism further includes a float and a filter screen, the top of the float being connected to a float ball, and the bottom wall of the float being connected to the filter screen; the float ball, float, and filter screen can float up and down as a whole according to the change in the level of lubricating oil in the oil passage of the second top cover.

[0014] When the level of lubricating oil in the second top cover oil passage is lower than or equal to the preset level, the float closes the top opening and the filter moves away from the top opening; when the level of lubricating oil in the second top cover oil passage is higher than the preset level, the float opens the top opening and the filter moves close to the top opening to filter the lubricating oil flowing through the top opening.

[0015] Further optionally, a top cover groove is formed at the bottom of the top cover; the vortex assembly includes a stationary vortex disk, which is disposed on the support frame and close to the top cover;

[0016] The top wall of the stationary vortex disk is provided with an outer baffle; the outer baffle is set in the top cover groove, and the outer baffle, the top wall of the stationary vortex disk and the side wall of the top cover groove together form the outer oil storage cavity.

[0017] Further optionally, the static vortex disk forms a first static disk outer flow channel and a second static disk outer flow channel, both of which penetrate the static vortex disk and extend from bottom to top.

[0018] The support frame has a first support frame flow channel and a second support frame flow channel. The first support frame flow channel extends from the top wall of the support frame toward the mounting cavity. The first support frame flow channel penetrates the support frame and extends from bottom to top.

[0019] The first static plate outer flow channel and the first support frame flow channel are connected to form the first flow channel, and the second static plate outer flow channel and the second support frame flow channel are connected to form the second flow channel.

[0020] Further optionally, the top wall of the stationary vortex disk is also provided with an inner baffle rib. In the radial direction of the stationary vortex disk, the inner baffle rib is located inside the outer baffle rib. The inner baffle rib, the top wall of the stationary vortex disk, and the outer baffle rib together form an inner oil storage cavity. There is a gap between the outer baffle rib and the top wall of the top cover groove. The gap connects the inner oil storage cavity and the outer oil storage cavity.

[0021] The scroll assembly further includes a moving scroll disk, which is disposed between the stationary scroll disk and the support frame, and the moving scroll disk and the stationary scroll disk are scroll-fitted; a compression cavity is formed between the moving scroll disk and the stationary scroll disk, and the moving scroll disk is driven to the crankshaft.

[0022] The stationary vortex disk has an internal flow channel that connects the internal oil storage chamber and the compression chamber.

[0023] Alternatively, an oil guide wall is formed at the top of the outer baffle, and the oil guide wall is inclined from top to bottom along the radial direction of the static vortex disk from the outside to the inside.

[0024] Further optionally, both the outer and inner retaining ribs are annular structures, and the top wall of the outer retaining rib is lower than the top wall of the inner retaining rib.

[0025] The top wall of the static vortex disk includes an outer top wall section and a middle top wall section arranged sequentially from the outside to the inside along the radial direction of the static vortex disk; the outer top wall section is located outside the outer baffle, the middle top wall section is located between the outer baffle and the inner baffle, and the middle top wall section is higher than the outer top wall section;

[0026] The top cover groove is a stepped groove and includes an outer top cover groove and an inner top cover groove. In the radial direction of the top cover, the inner top cover groove is located inside the outer top cover groove, and in the axial direction of the top cover, the inner top cover groove is located at the top of the outer top cover groove.

[0027] The outer baffle is disposed in the outer groove of the top cover, and the outer baffle, the outer top wall section and the side wall of the outer groove of the top cover together form the outer oil storage cavity; the inner baffle is disposed in the inner groove of the top cover, and the inner baffle, the middle top wall section and the outer baffle together form the inner oil storage cavity.

[0028] Further optionally, the top wall of the static vortex disk further includes an inner top wall section, which is located inside the inner baffle; the height of the inner top wall section is higher than the height of the outer top wall section.

[0029] A sealing ring is provided between the inner baffle and the top wall of the inner groove of the top cover, so that the inner baffle, the inner top wall section and the top wall of the inner groove of the top cover together form a lower exhaust cavity.

[0030] The top cover forms the air inlet between the upper exhaust chamber and the inner groove of the top cover, and the air inlet connects the upper exhaust chamber and the lower exhaust chamber; the inner top wall section forms the exhaust port that connects the lower exhaust chamber and the compression chamber.

[0031] Compared with the prior art, the main advantages of the present invention are:

[0032] (1) An efficient and directional lubrication system was established: Through optimized design, two independent lubricating oil flow paths (first lubricating oil flow path and second lubricating oil flow path) were formed, which can accurately and efficiently deliver lubricating oil from the oil reservoir at the top to the key bearings at the upper and lower ends of the crankshaft (i.e., the upper shaft hole of the support frame and the lower shaft hole of the bottom wall of the housing cavity); this design significantly improves the delivery efficiency and reliability of lubricating oil, ensures that the key friction pairs can be fully lubricated under any operating conditions, effectively avoids dry friction and wear problems caused by insufficient lubrication, and thus greatly improves the operating reliability and service life of the compressor;

[0033] (2) Intelligent dynamic adjustment of lubricating oil supply is realized: by setting a floating mechanism in one of the top cover oil passages, the flow rate of lubricating oil can be automatically adjusted according to the actual operating conditions of the compressor (especially the oil circulation demand at different frequencies); when the lubricating oil level is high, the floating mechanism opens the corresponding top cover oil passage to accelerate the oil supply; when the lubricating oil level is low, the floating mechanism closes the corresponding top cover oil passage or reduces the oil supply of the corresponding top cover oil passage to preserve the oil volume; this adaptive adjustment mechanism effectively solves the contradiction that the lubricating oil is carried away excessively during high-frequency operation and the return oil is insufficient during low-frequency operation, ensuring the dynamic balance of lubricating oil circulation;

[0034] (3) Significantly improves oil-gas separation efficiency and overall machine energy efficiency: The optimized flow path design combined with the throttling effect of the floating mechanism reduces the amount of lubricating oil supplied to the upward exhaust chamber, thereby reducing the possibility of high-pressure gas carrying lubricating oil out; This not only allows more lubricating oil to be effectively separated and kept in the system for circulation, reducing the consumption and waste of lubricating oil and reducing maintenance costs, but also avoids the impact of lubricating oil on the subsequent condenser, while improving the overall operating energy efficiency of the compressor;

[0035] (4) The structure is compact and the cost is reduced: the compressor’s own structure and operating characteristics enable efficient management and distribution of lubricating oil without relying on complex external oil pumps or multi-stage separators; while significantly improving performance, the structure of the entire lubricating oil circulation system is more compact and the maintenance cost is lower, overcoming the defects of volume, cost and complexity brought about by the additional system in the existing technology. Attached Figure Description

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0037] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0038] Figure 1 A schematic diagram of the structure of an embodiment of the scroll compressor provided by the present invention;

[0039] Figure 2A schematic diagram of the structure of an embodiment of the floating mechanism provided by the present invention;

[0040] Figure 3 A schematic diagram of the top wall structure of the static vortex disk provided by the present invention;

[0041] Figure 4 This is a cross-sectional structural schematic diagram of an embodiment of the static vortex disk provided by the present invention;

[0042] Figure 5 A schematic diagram of the flow path structure of the scroll compressor under high-frequency operating conditions provided by the present invention.

[0043] In the picture:

[0044] 1-House; 11-Bottom cavity;

[0045] 2-Top cover; 21-Air inlet; 22-Upper exhaust chamber; 23-Exhaust port; 24-Oil reservoir; 251-First top cover oil passage; 252-Second top cover oil passage; 261-Outer groove of top cover; 262-Inner groove of top cover;

[0046] 31-Stationary vortex disk; 311-Outer flow channel of the first stationary disk; 312-Outer flow channel of the second stationary disk; 313-Inner flow channel of the stationary disk; 314-Outer baffle; 3141-Oil guide wall; 315-Inner baffle; 3151-Sealing groove; 3161-Outer top wall section; 3162-Middle top wall section; 3163-Inner top wall section; 317-Exhaust port; 32-Moving vortex disk; 33-Support frame; 331-Flow channel of the first support frame; 332-Flow channel of the second support frame; 333-Mounting cavity; 341-Outer oil reservoir; 342-Inner oil reservoir; 35-Gap; 36-Compression cavity; 37-Lower exhaust cavity;

[0047] 4-Floating mechanism; 41-Cylinder body; 411-Cylinder body oil passage; 412-Top opening; 413-Bottom opening; 42-Float ball; 43-Float rod; 44-Filter screen;

[0048] 51-Oil-gas separator; 52-Crankshaft; 53-Sealing ring; 541-First bearing; 542-Second bearing; 543-Third bearing; 55-Cross; 561-Stator; 562-Rotor. Detailed Implementation

[0049] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0051] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0053] Existing scroll compressors face severe challenges in lubrication systems during high-frequency operation: high-speed airflow easily carries a large amount of lubricating oil into the exhaust chamber, leading to difficulties in oil-gas separation and preventing timely and effective oil return. This results in insufficient lubrication of critical components such as the crankshaft, causing wear. Simultaneously, unseparated lubricating oil is discharged with the high-pressure gas, resulting in oil waste, reduced energy efficiency, and environmental pollution. Existing solutions, such as complex separators or external oil pumps, suffer from structural complexity, high cost, and poor dynamic response, making it difficult to achieve precise oil quantity adjustment and efficient recovery under varying operating conditions.

[0054] This invention creatively provides a scroll compressor, comprising a casing, a top cover, a scroll assembly, a support frame, and a crankshaft. An external oil reservoir is formed between the top cover and the scroll assembly, and the support frame forms an mounting cavity. The top cover has an oil reservoir and two top cover oil passages connecting the oil reservoir and the external oil reservoir. The scroll assembly and the support frame together form a first flow channel and a second flow channel leading to the mounting cavity and the bottom cavity of the casing, respectively. A floating mechanism is provided in one of the two top cover oil passages. The floating mechanism can automatically open or close the oil passage according to the change of the lubricating oil level in the oil passage, thereby dynamically adjusting the downward oil supply. This design can adapt to different frequency operating conditions of the compressor: at high frequencies, it reduces oil carryover and ensures oil-gas separation effect; at low frequencies, it ensures that the lubricating oil can flow back to the oil reservoir in time and be stably supplied to the bearings to achieve effective lubrication. Without the need for complex external devices, it significantly improves the circulation efficiency of lubricating oil, reduces ineffective discharge of lubricating oil, and improves the operating efficiency and reliability of the compressor.

[0055] like Figures 1 to 5 As shown, this embodiment provides a scroll compressor, including a housing 1, a top cover 2, a scroll assembly, a support frame 33, a crankshaft 52, and a motor. The housing 1 forms a housing cavity, with the top of the housing cavity open and the bottom of the housing cavity closed. The top cover 2 covers the top of the housing cavity, and the top cover 2 and the housing 1 are connected by bolts. The scroll assembly and the support frame 33 are arranged sequentially from top to bottom in the housing cavity. The scroll assembly is mounted on the support frame 33, and the support frame 33 provides support for the scroll assembly. The support frame 33 forms an mounting cavity 333 and an upper shaft hole, and the bottom wall of the housing cavity forms a lower shaft hole. The crankshaft 52 is arranged in the housing cavity, and the upper end of the crankshaft 52 passes through the upper shaft hole and enters the mounting cavity 333 to drive the scroll assembly. The lower end of the crankshaft 52 is arranged in the lower shaft hole. The crankshaft 52, the upper shaft hole, and the lower shaft hole are all rotatably connected by bearings.

[0056] Specifically, the crankshaft 52 is rotatably mounted in the upper shaft hole via the upper bearing, and the lower end of the crankshaft 52 is rotatably mounted in the lower shaft hole via the lower bearing; the motor is mounted in the housing cavity and located at the bottom of the support frame 33, and the motor includes a rotor 562 and a stator 561. The rotor 562 surrounds the outside of the crankshaft 52 and the rotor 562 is drivenly connected to the crankshaft 52; the stator 561 surrounds the outside of the rotor 562 and the stator 561 and the rotor 562 are connected by magnetic force; when the stator 561 is energized with alternating current, the rotor 562 drives the crankshaft 52 to rotate;

[0057] The top cover 2 has an air inlet 21, an upper exhaust chamber 22, an exhaust port 23, and an oil reservoir 24. The air inlet 21 is used to deliver gas that has passed through the vortex assembly to the upper exhaust chamber 22. The upper exhaust chamber 22 is equipped with an oil-gas separator 51 for separating lubricating oil from the gas. The exhaust port 23 is used to discharge the separated gas. The oil reservoir 24 is used to store lubricating oil. Specifically, the air inlet 21 is formed on the side of the top cover 2 closest to the vortex assembly, and the upper exhaust chamber 22 and the oil reservoir are formed inside the top cover 2. The side wall of the top cover 24 has an exhaust hole 317. In the horizontal direction, the exhaust hole 317 and the oil storage tank 24 are located on both sides of the upper exhaust chamber 22. The air inlet 21, the exhaust port 23 and the oil storage tank 24 are all connected to the upper exhaust chamber 22. The gas after the action of the vortex assembly enters the upper exhaust chamber 22 through the air inlet 21. After being separated by the oil-gas separator 51, the gas is discharged through the exhaust port 23, and the lubricating oil enters the oil storage tank 24. The oil-gas separator 51 and the upper exhaust chamber 22 are interference-fitted.

[0058] An outer oil reservoir 341 is formed between the vortex assembly and the top cover 2. The top cover 2 has two top cover oil passages that both connect the oil reservoir 24 and the outer oil reservoir 341. The vortex assembly and the support frame 33 together form a first flow channel and a second flow channel. The first flow channel connects the outer oil reservoir 341 and the mounting cavity 333, and the second flow channel connects the outer oil reservoir 341 and the bottom cavity 11. The bottom cavity 11 is the space between the support frame 33 and the bottom wall of the housing cavity. The oil reservoir 24, the top cover oil passage, the outer oil reservoir 341, the first flow channel, and the mounting cavity 333 are sequentially connected to form a first lubricating oil flow path. The lubricating oil in the oil reservoir 24 enters the mounting cavity 333 through the first lubricating oil flow path to lubricate the bearing between the crankshaft 52 and the support frame 33. The oil reservoir 24, the top cover oil passage, the outer oil storage cavity 341, the second flow path, and the bottom cavity 11 are connected in sequence to form the second lubricating oil flow path. The lubricating oil in the oil reservoir 24 enters the bottom cavity 11 through the second lubricating oil flow path to lubricate the bearing between the crankshaft 52 and the bottom wall of the housing cavity. By optimizing the lubricating oil flow path, the delivery efficiency of the lubricating oil is significantly improved, ensuring that the lubricating oil reaches the parts that need lubrication through the lubricating oil flow path, thereby improving the lubrication effect.

[0059] A floating mechanism 4 is installed in one of the two top cover oil passages. The floating mechanism 4 can open or close the top cover oil passage according to the change of the lubricating oil level in the top cover oil passage, so as to adjust the flow rate of the lubricating oil and adapt to the lubricating oil circulation under different operating frequencies of the compressor. It effectively reduces the proportion of lubricating oil discharged with gas, improves the overall energy efficiency of the compressor, avoids lubricating oil waste, and reduces the volume and maintenance cost of the structure required for lubricating oil circulation.

[0060] The working principle of the floating mechanism 4 is explained below. The two top cover oil passages include a first top cover oil passage 251 and a second top cover oil passage 252. The first top cover oil passage 251 is set to be normally open, and the floating mechanism 4 is installed in the second top cover oil passage 252. Specifically, both the first top cover oil passage 251 and the second top cover oil passage 252 extend from top to bottom, and the flow area of ​​the second top cover oil passage 252 is larger than the flow area of ​​the first top cover oil passage 251.

[0061] The floating mechanism 4 is configured to close the second top cover oil passage 252 when the level of lubricating oil in the second top cover oil passage 252 is lower than or equal to the preset level. At this time, the lubricating oil in the oil storage tank 24 enters the outer oil storage chamber 341 only through the first top cover oil passage 251, thus avoiding the problem of insufficient lubricating oil return at low frequencies.

[0062] When the level of lubricating oil in the second top cover oil passage 252 is higher than the preset level, the floating mechanism 4 opens the second top cover oil passage 252; at this time, the lubricating oil in the oil storage tank 24 enters the outer oil storage chamber 341 through the first top cover oil passage 251 and the second top cover oil passage 252, avoiding the problem of excessive lubricating oil being carried away when the compressor is running at high frequency.

[0063] The specific structure of the floating mechanism 4 is described below. The floating mechanism 4 includes a cylinder 41 and a float 42. The cylinder 41 has an oil passage 411 extending from top to bottom inside. The top of the cylinder 41 has a top opening 412 and the bottom of the cylinder 41 has a bottom opening 413. The top opening 412 connects the top of the second top cover oil passage 252 and the cylinder oil passage 411, and the bottom opening 413 connects the bottom of the second top cover oil passage 252 and the cylinder oil passage 411. The flow area of ​​the top opening 412 is smaller than the flow area of ​​the bottom opening 413.

[0064] A float 42 is positioned at the top opening 412, and the float 42 can open or close the top opening 412 according to the change in the level of lubricating oil in the second top cover oil passage 252. When the level of lubricating oil in the second top cover oil passage 252 is lower than or equal to the preset level, the float 42 closes the top opening 412, and the cylinder oil passage 411 and the second top cover oil passage 252 are not connected. When the level of lubricating oil in the second top cover oil passage 252 is higher than the preset level, the float 42 opens the top opening 412, and the cylinder oil passage 411 and the second top cover oil passage 252 are connected. The outer diameter of the float 42 is larger than the diameter of the top opening 412.

[0065] Furthermore, the floating mechanism 4 also includes a float 43 and a filter screen 44. The top of the float 43 is connected to the float ball 42, and the bottom wall of the float 43 is connected to the filter screen 44. The float ball 42, the float 43, and the filter screen 44 can float up and down as a whole according to the change in the level of the lubricating oil in the second top cover oil passage 252, thereby opening or closing the top opening 412. The filtration area of ​​the filter screen 44 is larger than the flow area of ​​the top opening 412.

[0066] When the level of lubricating oil in the second top cover oil passage 252 is lower than or equal to the preset level, the float 42 closes the top opening 412 and the filter screen 44 moves away from the top opening 412; when the level of lubricating oil in the second top cover oil passage 252 is higher than the preset level, the float 42 opens the top opening 412 and the filter screen 44 moves close to the top opening 412 and filters the lubricating oil flowing through the top opening 412.

[0067] The following describes how the external oil storage cavity 341 is formed. A top cover groove is formed at the bottom of the top cover 2. The vortex assembly includes a stationary vortex disk 31, which is mounted on the support frame 33 and close to the top cover 2. A first top cover oil passage 251 and a second top cover oil passage 252 are formed between the top wall of the oil storage pool 24 and the top wall of the top cover groove.

[0068] The top wall of the stationary vortex disk 31 is provided with an outer baffle 314; the outer baffle 314 is set in the top cover groove, and the outer baffle 314, the top wall of the stationary vortex disk 31 and the side wall of the top cover groove together form an outer oil storage cavity 341; the oil storage pool 24 and the outer oil storage cavity 341 are connected through the first top cover oil passage 251 and the second top cover oil passage 252.

[0069] The following explains how the first and second flow channels are formed. The stationary vortex disk 31 has a first stationary disk outer flow channel 311 and a second stationary disk outer flow channel 312. Both the first stationary disk outer flow channel 311 and the second stationary disk outer flow channel 312 penetrate the stationary vortex disk 31 and extend from bottom to top.

[0070] The support frame 33 has a first support frame flow channel 331 and a second support frame flow channel 332. The first support frame flow channel 331 extends from the top wall of the support frame 33 to the mounting cavity 333. The first support frame flow channel 331 passes through the support frame 33 and extends from bottom to top. Specifically, along the radial direction of the stationary vortex disk 31 from the outside to the inside, the first support frame flow channel 331 is inclined from top to bottom.

[0071] The first stationary plate outer flow channel 311 and the first support frame flow channel 331 are connected to form the first flow channel, and the second stationary plate outer flow channel 312 and the second support frame flow channel 332 are connected to form the second flow channel; that is, the outer oil storage chamber 341, the first stationary plate outer flow channel 311, the first support frame flow channel 331 and the mounting cavity 333 are connected in sequence to transport the lubricating oil in the outer oil storage chamber 341 to the mounting cavity 333 to lubricate the bearing in the mounting cavity 333; the outer oil storage chamber 341, the second stationary plate outer flow channel 312, the second support frame flow channel 332 and the bottom cavity 11 are connected in sequence to transport the lubricating oil in the outer oil storage chamber 341 to the bottom cavity 11 to lubricate the bearing in the bottom cavity 11.

[0072] The following describes how lubricating oil enters the compression chamber 36 from the outer oil reservoir 341. The top wall of the stationary vortex disk 31 is also provided with an inner baffle 315. In the radial direction of the stationary vortex disk 31, the inner baffle 315 is located inside the outer baffle 314. The inner baffle 315, the top wall of the stationary vortex disk 31, and the outer baffle 314 together form an inner oil reservoir 342. There is a gap 35 between the outer baffle 314 and the top wall of the top cover groove. The gap 35 connects the inner oil reservoir 342 and the outer oil reservoir 341.

[0073] The scroll assembly also includes a moving scroll disk 32, which is disposed between the stationary scroll disk 31 and the support frame 33, and the moving scroll disk 32 and the stationary scroll disk 31 are scroll-engaged. A compression chamber 36 is formed between the moving scroll disk 32 and the stationary scroll disk 31, and the moving scroll disk 32 and the crankshaft 52 are drivenly connected by a third bearing 543. A stationary scroll tooth is formed on the side of the stationary scroll disk 31 near the moving scroll disk 32, and a moving scroll tooth is formed on the side of the moving scroll disk 32 near the stationary scroll disk 31. The stationary scroll tooth and the moving scroll tooth are scroll-engaged, and the crankshaft 52 drives the moving scroll disk 32 to rotate, thereby realizing air intake and exhaust. A cross 55 is provided between the lower end of the moving scroll disk 32 and the mounting cavity 333, so that the moving scroll disk 32 performs planar scrolling.

[0074] The stationary vortex disk 31 has an internal flow channel 313 that connects the internal oil storage chamber 342 and the compression chamber 36; that is, the external oil storage chamber 341, the partition 35, the internal oil storage chamber 342, the internal flow channel 313 and the compression chamber 36 are connected in sequence to form a third lubricating oil flow channel. The lubricating oil in the external oil storage chamber 341 can enter the compression chamber 36 through the third lubricating oil flow channel to lubricate the stationary vortex disk 31 and the moving vortex disk 32.

[0075] Furthermore, an oil guide wall 3141 is formed on the top of the outer baffle 314. Along the radial direction of the stationary vortex disk 31, the oil guide wall 3141 is inclined from top to bottom. Under the action of the oil guide wall 3141, the lubricating oil in the outer oil storage cavity 341 can quickly enter the inner oil storage cavity 342.

[0076] Preferably, both the outer retaining rib 314 and the inner retaining rib 315 are annular structures, and the height of the outer retaining rib 314 is lower than the height of the inner retaining rib 315; that is, the top wall of the outer retaining rib 314 is lower than the top wall of the inner retaining rib 315, and the highest point of the top wall of the outer retaining rib 314 is lower than the top wall of the inner retaining rib 315.

[0077] The top wall of the static vortex disk 31 includes an outer top wall section 3161 and a middle top wall section 3162 arranged sequentially from the outside to the inside along the radial direction of the static vortex disk 31; the outer top wall section 3161 is located outside the outer baffle 314, the middle top wall section 3162 is located between the outer baffle 314 and the inner baffle 315, and the middle top wall section 3162 is higher than the outer top wall section 3161;

[0078] The top cover groove is a stepped groove and includes an outer top cover groove 261 and an inner top cover groove 262; in the radial direction of the top cover 2, the inner top cover groove 262 is located inside the outer top cover groove 261; in the axial direction of the top cover 2, the inner top cover groove 262 is located at the top of the outer top cover groove 261; that is, the top wall of the outer top cover groove 261 is lower than the top wall of the inner top cover groove 262; both the outer top cover groove 261 and the inner top cover groove 262 are cylindrical grooves and are coaxially arranged.

[0079] The outer baffle 314 is installed inside the outer groove 261 of the top cover, and the outer baffle 314, the outer top wall section 3161 and the side wall of the outer groove 261 of the top cover together form an outer oil storage cavity 341; the inner baffle 315 is installed inside the inner groove 262 of the top cover, and the inner baffle 315, the middle top wall section 3162 and the outer baffle 314 together form an inner oil storage cavity 342; both the outer oil storage cavity 341 and the inner oil storage cavity 342 are annular structures and are coaxially arranged.

[0080] The following explains how to connect the air inlet 21 of the top cover 2 and the exhaust port 317 of the stationary vortex disk 31. The top wall of the stationary vortex disk 31 also includes an inner top wall section 3163, which is located inside the inner baffle 315. The height of the inner top wall section 3163 is higher than the height of the outer top wall section 3161.

[0081] A sealing ring 53 is provided between the inner baffle 315 and the top wall of the inner groove 262 of the top cover, so that the inner baffle 315, the inner top wall section 3163 and the top wall of the inner groove 262 of the top cover together form a lower exhaust cavity 37.

[0082] The top cover 2 has an air inlet 21 formed between the upper exhaust chamber 22 and the inner groove 262 of the top cover, and the air inlet 21 connects the upper exhaust chamber 22 and the lower exhaust chamber 37; the inner top wall section 3163 has an exhaust hole 317 formed, and the exhaust hole 317 connects the lower exhaust chamber 37 and the compression chamber 36; the gas in the compression chamber 36 enters the lower exhaust chamber 37 through the exhaust hole 317, and then enters the upper exhaust chamber 22 through the air inlet 21.

[0083] Thus, when the compressor operates at low frequency, the oil-gas separator 51 separates the lubricating oil, which enters the oil storage tank 24, and then enters the outer oil storage chamber 341 through the first top cover oil passage 251. A portion of the lubricating oil then enters the mounting chamber 333 through the first stationary disc outer flow passage 311 and the first support frame flow passage 331, lubricating the bearings within the mounting chamber 333. Another portion of the lubricating oil enters the bottom chamber 11 through the second stationary disc outer flow passage 312 and the second support frame flow passage 332, lubricating the bearings within the bottom chamber 11. The lubricating oil in the bottom chamber 11 is then recompressed and discharged as the vortex assembly draws in air, and then separated again by the oil-gas separator 51. This process achieves the circulation of the lubricating oil.

[0084] When the compressor operates at increased frequency, the oil-gas separator 51 increases its separation efficiency. The separated lubricating oil does not immediately enter the lubricating oil flow path and instead accumulates in the second top cover oil passage 252. The float 42, buoyed by the accumulated lubricating oil, rises and opens the top opening 412. A portion of the accumulated lubricating oil flows through the top of the second top cover oil passage 252 and the top opening 412 into the cylinder oil passage 411, then through the bottom opening 413 and the bottom of the second top cover oil passage 252 into the outer oil storage chamber 341. A portion of the accumulated lubricating oil flows directly into the outer oil storage chamber 341 through the first top cover oil passage 251. Furthermore, the higher the lubricating oil level in the second top cover oil passage 252, the larger the aperture of the top opening 412 allows lubricating oil to pass through, resulting in a larger flow rate of lubricating oil. This flow rate reaches its maximum when the filter screen 44 comes into contact with the top opening 412.

[0085] When the compressor operates at high frequency, lubricating oil can flow through both the first top cover oil passage 251 and the second top cover oil passage 252. This can cause the lubricating oil entering the outer oil reservoir 341 to be discharged in a timely manner, resulting in a rise in the lubricating oil level until it overflows into the inner oil reservoir 342 through the interval 35. At this time, most of the lubricating oil in the compressor accumulates on the discharge side of the compressor, and the circulation speed of the lubricating oil cannot keep up with the oil-gas separation speed. At this time, the scroll assembly may be in a state of dry running due to lack of oil. The lubricating oil in the inner oil reservoir 342 enters the compression chamber 36 through the inner flow channel 313 of the stationary plate, ensuring the lubrication of the scroll assembly at all times.

[0086] In summary, by optimizing the lubrication circuit, the delivery efficiency of lubricating oil after separation from the oil-gas separator 51 is significantly improved; the oil volume of the top cover 2 oil circuit is adjusted by the floating mechanism 4, which can be applied to the lubrication oil circulation under different operating frequencies of the compressor; the proportion of lubricating oil discharged with gas is effectively reduced, improving system energy efficiency and reducing environmental pollution risks; the probability of dry friction and poor lubrication is reduced, extending the reliable life of the scroll compressor under high-frequency operating conditions; the structure is simple, forming an integrated lubrication circuit on the basis of the existing structure, reducing the overall size and manufacturing and maintenance costs.

[0087] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A scroll compressor, characterized in that, The assembly includes a housing (1), a top cover (2), a scroll assembly, a support frame (33), and a crankshaft (52). The housing (1) is configured to form a housing cavity with an open top, and the top cover (2) covers the top of the housing cavity. The scroll assembly and the support frame (33) are arranged sequentially from top to bottom within the housing cavity. The support frame (33) forms a mounting cavity (333) and an upper shaft hole, and the bottom wall of the housing cavity forms a lower shaft hole. The upper end of the crankshaft (52) passes through the upper shaft hole and enters the mounting cavity (333) to drive the scroll assembly. The lower end of the crankshaft (52) is disposed within the lower shaft hole. The crankshaft (52) is connected to the upper shaft hole and the lower shaft hole by bearings. The top cover (2) has an air inlet (21), an upper exhaust chamber (22), an exhaust port (23), and an oil reservoir (24). The air inlet (21) is used to deliver gas that has been acted upon by the vortex assembly to the upper exhaust chamber (22). The upper exhaust chamber (22) is provided with an oil-gas separator (51) for separating the lubricating oil from the gas. The exhaust port (23) is used to discharge the separated gas. The oil reservoir (24) is used to store the lubricating oil. An outer oil storage cavity (341) is formed between the vortex assembly and the top cover (2). The top cover (2) forms two top cover oil passages that both connect the oil storage tank (24) and the outer oil storage cavity (341). The vortex assembly and the support frame (33) together form a first flow channel and a second flow channel. The first flow channel connects the outer oil storage cavity (341) and the mounting cavity (333). The second flow channel connects the outer oil storage cavity (341) and the bottom cavity (11). The bottom cavity (11) is the space between the support frame (33) and the bottom wall of the housing cavity. One of the two top cover oil passages is provided with a floating mechanism (4), which can open or close the top cover oil passage according to the change of the lubricating oil level in the top cover oil passage.

2. The scroll compressor according to claim 1, characterized in that, The two top cover oil passages include a first top cover oil passage (251) and a second top cover oil passage (252); the first top cover oil passage (251) is normally open, and the floating mechanism (4) is provided in the second top cover oil passage (252); The floating mechanism (4) is configured to: close the second top cover oil passage (252) when the level of lubricating oil in the second top cover oil passage (252) is lower than or equal to a preset level; and open the second top cover oil passage (252) when the level of lubricating oil in the second top cover oil passage (252) is higher than the preset level.

3. The scroll compressor according to claim 2, characterized in that, The floating mechanism (4) includes a cylinder (41) and a float (42). The cylinder (41) has an oil passage (411) inside. The top of the cylinder (41) has a top opening (412) and the bottom has a bottom opening (413). The top opening (412) connects the top of the second top cover oil passage (252) and the cylinder oil passage (411). The bottom opening (413) connects the bottom of the second top cover oil passage (252) and the cylinder oil passage (411). The float (42) is located at the top opening (412), and the float (42) can open or close the top opening (412) according to the change in the level of lubricating oil in the second top cover oil passage (252).

4. The scroll compressor according to claim 3, characterized in that, The floating mechanism (4) also includes a float (43) and a filter screen (44). The top of the float (43) is connected to a float ball (42), and the bottom wall of the float (43) is connected to the filter screen (44). The float ball (42), float (43), and filter screen (44) can float up and down as a whole according to the change in the level of lubricating oil in the second top cover oil passage (252). When the level of lubricating oil in the second top cover oil passage (252) is lower than or equal to the preset level, the float (42) closes the top opening (412) and the filter (44) moves away from the top opening (412); when the level of lubricating oil in the second top cover oil passage (252) is higher than the preset level, the float (42) opens the top opening (412) and the filter (44) moves close to the top opening (412) and filters the lubricating oil flowing through the top opening (412).

5. The scroll compressor according to claim 1, characterized in that, The bottom of the top cover (2) has a top cover groove; the vortex assembly includes a static vortex disk (31), which is disposed on the support frame (33) and close to the top cover (2); The top wall of the stationary vortex disk (31) is provided with an outer baffle (314); the outer baffle (314) is located in the top cover groove, and the outer baffle (314), the top wall of the stationary vortex disk (31) and the side wall of the top cover groove together form the outer oil storage cavity (341).

6. The scroll compressor according to claim 5, characterized in that, The static vortex disk (31) has a first static disk outer flow channel (311) and a second static disk outer flow channel (312), both of which penetrate the static vortex disk (31) and extend from bottom to top. The support frame (33) has a first support frame flow channel (331) and a second support frame flow channel (332). The first support frame flow channel (331) extends from the top wall of the support frame (33) toward the mounting cavity (333). The first support frame flow channel (331) penetrates the support frame (33) and extends from bottom to top. The first static plate outer flow channel (311) and the first support frame flow channel (331) are connected to form the first flow channel, and the second static plate outer flow channel (312) and the second support frame flow channel (332) are connected to form the second flow channel.

7. The scroll compressor according to claim 5, characterized in that, The top wall of the stationary vortex disk (31) is also provided with an inner baffle (315). In the radial direction of the stationary vortex disk (31), the inner baffle (315) is located inside the outer baffle (314). The inner baffle (315), the top wall of the stationary vortex disk (31), and the outer baffle (314) together form an inner oil storage cavity (342). There is a gap (35) between the outer baffle (314) and the top wall of the top cover groove. The gap (35) connects the inner oil storage cavity (342) and the outer oil storage cavity (341). The vortex assembly further includes a moving vortex disk (32), which is disposed between the stationary vortex disk (31) and the support frame (33) and the moving vortex disk (32) and the stationary vortex disk (31) are vortex-fitted; a compression cavity (36) is formed between the moving vortex disk (32) and the stationary vortex disk (31), and the moving vortex disk (32) and the crankshaft (52) are driven to connect; The stationary vortex disk (31) has an internal flow channel (313) that connects the internal oil storage chamber (342) and the compression chamber (36).

8. The scroll compressor according to claim 7, characterized in that, The top of the outer baffle (314) is formed with an oil guide wall (3141), which is inclined from top to bottom along the radial direction of the static vortex disk (31) from the outside to the inside.

9. The scroll compressor according to claim 7, characterized in that, Both the outer baffle (314) and the inner baffle (315) are annular structures, and the top wall of the outer baffle (314) is lower than the top wall of the inner baffle (315). The top wall of the static vortex disk (31) includes an outer top wall section (3161) and a middle top wall section (3162) arranged sequentially from the outside to the inside along the radial direction of the static vortex disk (31); the outer top wall section (3161) is located outside the outer baffle (314), the middle top wall section (3162) is located between the outer baffle (314) and the inner baffle (315), and the middle top wall section (3162) is higher than the outer top wall section (3161); The top cover groove is a stepped groove and includes an outer top cover groove (261) and an inner top cover groove (262). In the radial direction of the top cover (2), the inner top cover groove (262) is located inside the outer top cover groove (261). In the axial direction of the top cover (2), the inner top cover groove (262) is located at the top of the outer top cover groove (261). The outer baffle (314) is disposed in the outer groove (261) of the top cover, and the outer baffle (314), the outer top wall section (3161) and the side wall of the outer groove (261) of the top cover together form the outer oil storage cavity (341); the inner baffle (315) is disposed in the inner groove (262) of the top cover, and the inner baffle (315), the middle top wall section (3162) and the outer baffle (314) together form the inner oil storage cavity (342).

10. The scroll compressor according to claim 9, characterized in that, The top wall of the static vortex disk (31) also includes an inner top wall section (3163), which is located inside the inner baffle (315); the height of the inner top wall section (3163) is higher than the height of the outer top wall section (3161). A sealing ring (53) is provided between the inner baffle (315) and the top wall of the inner groove of the top cover (262), so that the inner baffle (315), the inner top wall section (3163) and the top wall of the inner groove of the top cover (262) together form a lower exhaust chamber (37). The top cover (2) has an air inlet (21) formed between the upper exhaust chamber (22) and the inner groove (262) of the top cover, and the air inlet (21) connects the upper exhaust chamber (22) and the lower exhaust chamber (37); the inner top wall section (3163) has an exhaust hole (317) that connects the lower exhaust chamber (37) and the compression chamber (36).

Images