Oil separation structure and compressor

Abstract

The application discloses a kind of oil separation structure and compressor, oil separation structure includes oil separation cavity and the driving unit, connecting unit and separation unit being arranged in oil separation cavity, driving unit is set on connecting unit and it can drive connecting unit rotation, separation unit is set on connecting unit and it can rotate with connecting unit;Oil inlet is on oil separation cavity, oil-gas mixture makes driving unit rotate by oil inlet, in turn, through connecting unit drive separation unit rotation, separation unit can act on oil-gas mixture when rotating.The high-speed active rotation of separation unit in the application provides sustained and powerful centrifugal force, which significantly enhances and stabilizes the centrifugal effect required for oil-gas separation, overcoming the problem of insufficient centrifugal force and limited separation efficiency caused by the dependence of traditional oil separation pipe on the rotation speed of fluid itself, thereby greatly improving the oil-gas separation efficiency, ensuring low oil content in the compressor exhaust, and maintaining the normal operation performance of air conditioning system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of compressors, and particularly relates to an oil separation structure and a compressor. BACKGROUND

[0002] Scroll compressors are a type of high-efficiency and reliable compressor that has been developed and widely used in refrigeration, air conditioning, and heat pump systems since the late 1970s. Scroll compressors use a unique scroll design, where two intermeshing spiral scrolls work together to compress gas. This design not only simplifies the internal structure and reduces friction between moving parts, but also significantly improves compression efficiency and operational stability.

[0003] During operation, scroll compressors use lubricating oil to lubricate internal moving parts. This lubricating oil mixes with the refrigerant gas during the compression process and is discharged with the exhaust gas. If the lubricating oil is not separated, it may enter the condenser, evaporator, or other components of the refrigeration system, leading to performance degradation or even damage to these devices. Therefore, it is necessary to separate the lubricating oil from the compressed refrigerant gas to ensure that the discharged gas contains little or no lubricating oil. At the same time, the separated lubricating oil needs to be recycled back into the compressor to avoid loss and improve the overall efficiency of the system. If the lubricating oil is lost in large quantities, not only does it increase maintenance costs, but it also reduces the performance of the compressor. By effectively recycling the lubricating oil, the consumption of lubricating oil can be reduced, thereby reducing operating costs. At the same time, this also meets environmental requirements and reduces the impact of lubricating oil on the environment.

[0004] Traditional oil-gas separation structures are composed of an oil separation pipe, which is designed in a cylindrical shape and installed vertically in the oil separation cavity of the cover. The oil separation cavity formed by the outer surface of the oil separation pipe causes the oil-gas mixture to rotate inside, and the oil-gas separation is achieved through the centrifugal force generated by the oil-gas mixture itself. However, the size of this centrifugal force depends on the rotational speed of the oil-gas mixture itself, and it will continuously decrease as the movement continues. This results in limited oil-gas separation effect of the oil separation pipe structure. SUMMARY

[0005] Therefore, the present application provides an oil separation structure and a compressor to solve the technical problem of low separation efficiency of traditional oil separation structures.

[0006] To solve the above problems, according to one aspect of the present application, embodiments of the present application provide an oil separation structure, which comprises an oil separation cavity, and a driving unit, a connecting unit and a separating unit arranged in the oil separation cavity, the driving unit is arranged on the connecting unit and can drive the connecting unit to rotate, the separating unit is arranged on the connecting unit and can rotate with the connecting unit; the oil separation cavity is provided with an air inlet, and the oil-gas mixture makes the driving unit rotate through the air inlet, thereby driving the separating unit to rotate through the connecting unit, and the separating unit can act on the oil-gas mixture when rotating; the separating unit comprises a rotating body and a cutting module, the rotating body is fixed on the connecting unit and rotates with the connecting unit, and the cutting module is arranged at the edge of the rotating body and is used for breaking oil droplets in the oil-gas mixture.

[0007] In some embodiments, the rotating body is a first blade extending radially, and a plurality of the first blades are arranged and distributed along the circumference of the connecting unit.

[0008] In some embodiments, the cutting module is a protrusion arranged at the edge of the first blade.

[0009] In some embodiments, the protrusion is sawtooth-shaped or trapezoidal, and when the protrusion is sawtooth-shaped, the tip angle α satisfies 10°<α<60°.

[0010] In some embodiments, the driving unit comprises a plurality of second blades arranged around the outer wall of the connecting unit, and the second blade has an inclined surface at the end away from the connecting unit, and the oil-gas mixture acts on the inclined surface through the air inlet to make the second blade rotate.

[0011] In some embodiments, the connecting unit comprises a rotating shaft and a bearing, the rotating shaft is provided with a shaft shoulder, the rotating shaft cooperates with the bearing and is limited by the shaft shoulder; the driving unit and the separating unit are both fixed on the rotating shaft.

[0012] In some embodiments, the outer wall of the bearing is provided with a plurality of oil through holes opened along the circumference, so that the separated lubricating oil can flow up and down along the inner wall of the oil separation cavity.

[0013] In some embodiments, the inner wall of the oil separation cavity is paved with an oil separation ring piece; and / or the oil separation ring piece is an integral annular sheet or comprises a plurality of arc-shaped sub-pieces arranged in an annular array.

[0014] According to another aspect of the present application, embodiments of the present application provide a compressor, which comprises a shell, a front end cover, a bracket, a dynamic disc and a static disc arranged in the shell, an oil distribution cavity is arranged in the front end cover, the oil distribution structure as described above is installed in the oil distribution cavity, the static disc is fixed to the inner side end face of the front end cover, the dynamic disc is installed on the bracket, and a back pressure cavity is formed between the dynamic disc and the bracket.

[0015] In some embodiments, the front end cover is provided with an oil return port and an exhaust port, lubricating oil in the oil-gas mixture flows to the friction pair and the back pressure cavity of the compressor through an oil return channel after passing through the oil return port, and gas in the oil-gas mixture is discharged after passing through the exhaust port and is recycled.

[0016] In some embodiments, the oil return channel comprises a first oil return channel, a second oil return channel and a third oil return channel, the first oil return channel is arranged in the static disc along a first direction, the second oil return channel is arranged in the static disc along a second direction, the third oil return channel is arranged on the bracket, and the first oil return channel, the second oil return channel and the third oil return channel are sequentially communicated.

[0017] Compared with the prior art, the oil distribution structure of the present application has at least the following beneficial effects:

[0018] The oil distribution structure provided by the present application comprises an oil distribution cavity and a driving unit, a connecting unit and a separation unit arranged in the oil distribution cavity, the driving unit is arranged on the connecting unit and can drive the connecting unit to rotate, the separation unit is arranged on the connecting unit and can rotate with the connecting unit; the oil distribution cavity is provided with an air inlet, the oil-gas mixture passes through the air inlet to drive the driving unit to rotate, thereby driving the separation unit to rotate through the connecting unit, and the separation unit can act on the oil-gas mixture when rotating.

[0019] Firstly, the driving unit directly utilizes the kinetic energy of the oil-gas mixture inlet to drive itself to rotate, without the need for an additional external power source, thus realizing low-cost operation and higher system reliability. Secondly, and most importantly, the high-speed active rotation of the separation unit provides a sustained and powerful centrifugal force, which significantly enhances and stabilizes the centrifugal effect required for oil-gas separation, overcoming the problem of insufficient centrifugal force and limited separation efficiency caused by the traditional oil separation tube relying solely on the rotation speed of the fluid itself, thus significantly improving the oil-gas separation efficiency and ensuring a low oil content in the compressor exhaust, thereby maintaining the normal operation performance of the air conditioning system. Furthermore, the active crushing effect of the separation unit on large oil droplets refines the oil droplets, making them more easily separated by the centrifugal force, which further enhances the separation effect. Finally, more efficient and complete oil droplet separation and flinging towards the cavity wall, combined with the structural design of the oil separation cavity, significantly accelerates the collection and return of the lubricating oil after separation, effectively reducing the lubricating oil loss and maintenance costs, while also improving the reliability and service life of the compressor. The entire system improves the performance and efficiency of the compressor through internal energy conversion and active separation mechanisms.

[0020] The compressor provided by the application is designed based on the above-mentioned oil separation structure, and the beneficial effects thereof are described above, which will not be repeated here.

[0021] The above description is only a summary of the technical solutions of the application. In order to more clearly understand the technical means of the application and to implement the content of the description, the following describes the preferred embodiments of the application in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a sectional view of the oil separation structure provided by the embodiments of the application;

[0024] Figure 2 is a structural schematic view of the oil separation structure provided by the embodiments of the application;

[0025] Figure 3 is Figure 2 is an enlarged view of part A in FIG. 8;

[0026] Figure 4 is a structural schematic view of the bearing in the oil separation structure provided by the embodiments of the application;

[0027] Figure 5is another structural schematic view of the bearing in the oil distribution structure provided by the embodiment of the present application;

[0028] Figure 6 is a structural schematic view of the oil distribution ring piece in the oil distribution structure provided by the embodiment of the present application;

[0029] Figure 7 is a partial sectional view of the compressor provided by the embodiment of the present application;

[0030] Figure 8 is Figure 7 is a partial enlarged view at B in FIG. 1;

[0031] Figure 9 is Figure 7 is a partial enlarged view at C in FIG. 1;

[0032] wherein:

[0033] 1, oil distribution structure; 11, oil distribution cavity; 12, driving unit; 13, connecting unit; 14, separation unit; 15, oil distribution ring piece; 111, air inlet; 121, second blade; 131, rotating shaft; 132, bearing; 133, shaft shoulder; 134, oil passage; 141, rotating body; 142, cutting module; 1411, first blade; 2, shell; 3, front end cover; 31, oil return port; 32, exhaust port; 4, support; 5, moving disc; 6, stationary disc; 7, back pressure cavity; 8, oil return channel; 81, first oil return channel; 82, second oil return channel; 83, third oil return channel. DETAILED DESCRIPTION

[0034] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined object of the present application, the following describes the specific embodiments, structures, features and effects according to the present application in detail in combination with the drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0035] In the description of the present application, it should be clear that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence; the terms "vertical", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not mean that the devices or elements referred to must have a particular orientation or position, and therefore cannot be understood as a limitation on the present application.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] Example 1

[0038] This embodiment provides an oil separation structure, such as Figures 1-9 As shown, the oil separation structure includes an oil separation chamber 11 and a driving unit 12, a connecting unit 13 and a separating unit 14 arranged in the oil separation chamber 11, the driving unit 12 is arranged on the connecting unit 13 and can drive the connecting unit 13 to rotate, and the separating unit 14 is arranged on the connecting unit 13 and can rotate with the connecting unit 13; the oil separation chamber 11 has an air inlet 111, and the oil-gas mixture rotates the driving unit 12 through the air inlet 111, and then drives the separating unit 14 to rotate through the connecting unit 13, and the separating unit 14 can act on the oil-gas mixture when it rotates.

[0039] Inside the oil separation chamber 11, the connecting unit 13 is vertically or substantially vertically arranged. The driving unit 12 is fixedly installed at the lower region of the connecting unit 13, near the air inlet 111 of the oil separation chamber 11, so as to be directly impacted by the incoming oil-gas mixture. The separation unit 14 is fixedly installed at the upper region of the connecting unit 13, above the driving unit 12, and closer to the air outlet region of the oil separation chamber 11. Therefore, the driving unit 12, the connecting unit 13 and the separation unit 14 are mechanically connected in series: the driving unit 12 drives the connecting unit 13 to rotate, and the connecting unit 13 drives the separation unit 14 to rotate synchronously. The core function of the driving unit 12 is to directly convert the kinetic energy of the oil-gas mixture entering the oil separation chamber 11 from the air inlet 111 at a certain speed and direction (usually tangential) into its own rotational mechanical energy. It does not require an external power source, but relies only on the flow of the oil-gas mixture itself as the power input. The main function of the connecting unit 13 is to rigidly connect the driving unit 12 and the separation unit 14 to form a rotating body. It acts as a bridge for power transmission, reliably and efficiently transmitting the rotational motion generated by the driving unit 12 to the separation unit 14 above. The core function of the separation unit 14 is to actively act on the oil-gas mixture flowing through its region, achieving efficient oil-gas separation. It uses its high-speed rotational motion to produce two key effects: one is to enhance the centrifugal rotational motion of the oil-gas mixture, causing the oil droplets to be thrown to the wall of the oil separation chamber 11 under the action of stronger centrifugal force; the other is that its specific structure can physically impact, shear or cut larger oil droplets in the oil-gas mixture into smaller particles, which are more easily separated under the action of centrifugal force.

[0040] The cooperation of the driving unit 12, the connecting unit 13 and the separation unit 14 is a continuous energy conversion and separation process. The working process is as follows: the oil-gas mixture with a certain speed and pressure enters the oil separation chamber 11 from the air inlet 111, and the high-speed airflow directly impacts and drives the driving unit 12 near the inlet to rotate. The rotation of the driving unit 12 drives the connecting unit 13 connected thereto to rotate synchronously. The rotation of the connecting unit 13 in turn drives the separation unit 14 fixed to the upper end thereof to rotate at the same speed. When the oil-gas mixture flows in the oil separation chamber 11 to the region of the rotating separation unit 14, the separation unit 14 plays a dual role: on the one hand, its high-speed rotation significantly enhances the centrifugal effect of the flow field, forcing the oil droplets to move rapidly towards the wall of the oil separation chamber 11; on the other hand, the rotating parts of the separation unit 14 actively impact and cut the oil-gas mixture flowing therethrough, especially breaking the large oil droplets therein into smaller oil droplet particles. These separated and broken oil droplets are thrown to the inner wall of the oil separation chamber 11 under the action of strong centrifugal force, and gather into an oil film and finally flow to the oil return channel under the action of gravity. The gas separated from most of the oil droplets continues to flow upwards and is discharged from the air outlet.

[0041] After adopting the oil separation structure of the embodiment, firstly, the driving unit 12 directly utilizes the kinetic energy of the oil-gas mixture inlet to drive itself to rotate, without an additional external power source, thereby realizing low-cost operation and higher system reliability. Secondly, and most importantly, the high-speed active rotation of the separation unit 14 provides a sustained and powerful centrifugal force, which significantly enhances and stabilizes the centrifugal effect required for oil-gas separation, overcoming the problem of insufficient centrifugal force and limited separation efficiency caused by the traditional oil separation tube relying only on the rotation speed of the fluid itself, thereby greatly improving the oil-gas separation efficiency and ensuring a low oil content in the compressor exhaust, thereby maintaining the normal operation performance of the air conditioning system. Furthermore, the active crushing effect of the separation unit 14 on large oil droplets refines the oil droplets, making them more easily separated by the centrifugal force, which further improves the separation effect. Finally, more efficient and complete oil droplet separation and flinging towards the cavity wall, combined with the structural design of the oil separation cavity 11 itself, significantly accelerates the collection and return of the separated lubricating oil, effectively reducing the lubricating oil loss and maintenance costs, while also improving the reliability and service life of the compressor. The entire system improves the performance and efficiency of the compressor through internal energy conversion and active separation mechanisms.

[0042] In specific embodiments, as shown in Figure 2 The separation unit 14 includes a rotating body 141 fixed to the connection unit 13 and rotating therewith, and a cutting module 142 provided at the edge of the rotating body 141 for crushing oil droplets in the oil-gas mixture.

[0043] In the specific structure of the separation unit 14, the rotating body 141 is coaxially fixed to the upper end of the connection unit 13 through a central mounting hole, and the two are synchronized by key groove or interference fit; the cutting module 142 is fixed on the outer circumferential surface of the rotating body 141 in a continuous or intermittent annular array, and the cutting edge thereof extends outward along the radial direction of the rotating body 141, forming a physical protruding structure higher than the body of the rotating body 141, so that the cutting module 142 is located in the main flow path region of the oil-gas mixture.

[0044] The core function of the rotating body 141 is to transmit the rotational kinetic energy generated by the driving unit 12 to the working area of the separation unit 14 through rigid connection with the connection unit 13, thereby providing a stable rotational motion basis for the cutting module 142; the core function of the cutting module 142 is to actively impact the oil-gas mixture flowing therethrough by using its high-speed rotating physical protruding structure, thereby crushing large-size oil droplets suspended in the gas into micron-sized small particles through mechanical shearing force, and changing the physical form of the oil droplets to improve the separation efficiency.

[0045] When the rotating body 141 works with the cutting module 142, the rotating body 141 rotates at high speed under the driving of the connecting unit 13, and drives the cutting module 142 fixed on the edge thereof to form a dynamic cutting area; when the oil-gas mixture spirally rises along the inner wall of the oil separation cavity 11 to the working area of the separation unit 14, the protruding blade edge of the cutting module 142 continuously cuts the oil droplets at a relatively high speed, and the working process produces a double effect: on the physical level, large oil droplets are broken into small oil droplets through collision and shear, and the total surface area of the oil droplets is significantly increased; on the fluid dynamics level, the local turbulent intensity is enhanced, so that the small oil droplets broken are more easily captured by the centrifugal force field. Finally, the oil droplets are separated.

[0046] In specific embodiments, as shown in Figure 2 , the rotating body 141 is a first blade 1411 extending radially, and a plurality of first blades 1411 are provided and distributed circumferentially along the connecting unit 13. The rotating body 141 adopts a structure of a plurality of first blades 1411 extending radially and uniformly distributed circumferentially along the connecting unit 13. The plurality of radial first blades 1411 constitute a fan-like fluid driving surface that can significantly enhance the guiding and accelerating effect on the airflow when the oil-gas mixture flows through, so that the mixture obtains stronger rotational motion, thereby strengthening the rotational flow required for centrifugal separation. The cutting module 142 provided on the edge of the first blade 1411 forms a continuous or intermittent cutting array circumferentially, which can cover a wider flow passage cross section when rotating at high speed, ensuring that oil droplets at different radial positions can be subjected to mechanical cutting effect, thereby improving the breaking coverage of large oil droplets. The circumferentially uniform first blade 1411 structure enables the rotating body 141 to maintain dynamic balance when rotating at high speed, avoiding vibration caused by uneven mass distribution, and ensuring the stability of the oil separation structure during long-term operation.

[0047] In specific embodiments, as shown in Figure 2 and Figure 3 , the cutting module 142 is a protrusion provided on the edge of the first blade 1411. The cutting module 142 adopts a protrusion structure provided on the edge of the first blade 1411, which mainly produces the following effects: when the protrusion structure rotates at high speed with the first blade 1411, its protruding physical profile directly acts on the oil-gas mixture flowing through the edge of the blade, and breaks the oil droplets into smaller particles through mechanical collision and shear; at the same time, the protrusion structure as a local strengthening point of the blade edge enhances the flow field disturbance during rotation, so that the oil droplets are more easily separated from the airflow; in addition, the protrusion structure is directly integrated into the blade body, without the need for additional components, which not only maintains the structural strength but also avoids increasing the rotational resistance, ensuring that the oil separation efficiency is improved while maintaining the stability of the system operation.

[0048] In specific embodiments, the protrusion is sawtooth-shaped or trapezoidal, and when the protrusion is sawtooth-shaped, the tip angle a satisfies 10°<a<60°.

[0049] The protrusions of the cutting module 142 adopt a sawtooth or trapezoidal structure, and the tip angle a of the sawtooth protrusion is limited to between 10° and 60°, mainly producing the following effects: the sharp tip of the sawtooth protrusion can more effectively pierce and tear the oil droplets in high-speed rotation, significantly enhancing the breaking effect; the trapezoidal protrusion realizes continuous shearing action through the flat edge, and both structures can adapt to the breaking needs of oil droplets of different viscosities. At the same time, the range of 10°<a<60° ensures that the sawtooth tip has sufficient structural strength (too small angle is easy to break, and too large angle reduces the piercing ability), while improving the oil droplet breaking efficiency and ensuring the reliability of the protrusion in long-term operation.

[0050] In specific embodiments, as shown in Figure 2 The driving unit 12 includes a plurality of second blades 121 arranged around the outer wall of the connecting unit 13, and the end of the second blade 121 away from the connecting unit 13 has an inclined surface. The oil and gas mixture acts on the inclined surface through the gas inlet 111 to make the second blade 121 rotate. The driving unit 12 adopts a plurality of second blades 121 arranged around the outer wall of the connecting unit 13, and the plurality of second blades 121 are uniformly distributed in the circumferential direction to form a continuous driving surface, ensuring that the oil and gas mixture can contact the blade force surface at any phase angle when entering from the gas inlet 111, avoiding intermittent driving force, and ensuring rotation stability; the root of the second blade 121 is directly fixed to the outer wall of the connecting unit 13, realizing zero loss transmission of torque, and making the rotational kinetic energy of the driving unit 12 efficiently transmitted to the connecting unit 13; the end of the second blade 121 away from the rotation center is designed with an inclined surface, and the angle of the inclined surface matches the tangential inlet direction of the gas inlet 111, so that the high-speed oil and gas mixture produces the maximum tangential component force when impacting the inclined surface, and the fluid kinetic energy is efficiently converted into blade rotation torque, thereby driving the system to rotate using the kinetic energy of the oil and gas mixture itself without the need for an additional power source.

[0051] In specific embodiments, as shown in Figure 1 The connecting unit 13 includes a rotating shaft 131 and a bearing 132, the rotating shaft 131 has a shaft shoulder 133, the rotating shaft 131 cooperates with the bearing 132 and is limited by the shaft shoulder 133; the driving unit 12 and the separation unit 14 are both fixed on the rotating shaft 131.

[0052] In the specific structure of the connecting unit 13, the rotating shaft 131 vertically penetrates the central region of the oil separation cavity 11, and the shaft body is provided with a radial protruding shaft shoulder 133; the inner ring of the bearing 132 (usually a rolling bearing or a sliding bearing) is tightly sleeved on the rotating shaft 131, and the end face is tightly combined with one side of the shaft shoulder 133, so that the bearing 132 is precisely positioned and limited in the axial direction of the rotating shaft 131 through the shaft shoulder 133; the second blade 121 of the driving unit 12 is fixedly installed on the lower segment (close to the air inlet 111 region) of the rotating shaft 131, and the first blade 1411 of the separation unit 14 is fixedly installed on the upper segment (close to the exhaust region) of the rotating shaft 131, and the three are coaxially and rigidly connected.

[0053] The core role of the rotating shaft 131 is to act as the center of mechanical transmission, to transmit the rotating power generated by the driving unit 12 to the separation unit 14, and to bear the weight and rotating load of the two; the core role of the bearing 132 is to support the rotating shaft 131 and constrain its radial runout, to ensure that the rotating shaft 131 remains stable and coaxial rotation in the oil separation cavity 11, while reducing the rotating friction resistance; the core role of the shaft shoulder 133 is to provide an axial positioning reference surface for the bearing 132, to prevent the bearing 132 from moving axially on the rotating shaft 131, and to ensure that the driving unit 12 and the separation unit 14 remain fixed in the axial working position.

[0054] In this embodiment, the shaft shoulder 133 precisely fixes the position of the bearing 132 on the rotating shaft 131 through axial limiting, and the outer ring of the bearing 132 is fixed on the shell of the oil separation cavity 11 to form stable support; when the oil-gas mixture impacts the second blade 121 of the driving unit 12, the torque generated is synchronously transmitted to the separation unit 14 through the rotating shaft 131, at which time the bearing 132 constrains the radial deviation of the rotating shaft 131, avoiding the collision of the blade with the cavity; the shaft shoulder 133 prevents the rotating shaft 131 from moving axially in high-speed rotation, ensuring that the separation unit 14 is always in the designed working interval. This cooperation ultimately realizes high concentricity and low vibration operation of the rotating system, ensuring long-term stable operation of the oil separation structure.

[0055] In specific embodiments, such as Figure 4 and Figure 5As shown, the outer wall of the bearing 132 has a plurality of circumferential oil holes 134, so that the separated lubricating oil can flow up and down along the inner wall of the oil separation cavity 11. A plurality of circumferentially distributed oil holes 134 are arranged on the outer wall of the bearing 132, which allows the lubricating oil adhering to the inner wall of the oil separation cavity 11 to flow downward unobstructed through the bearing installation area, avoiding the accumulation of lubricating oil above the bearing due to the blockage of the oil path by the solid structure of the bearing outer ring; at the same time, the circumferentially distributed hole positions ensure that a continuous oil passage is provided regardless of the angular position of the rotating shaft 131, ensuring that the separated lubricating oil can stably flow downward along the entire circumferential direction of the cavity wall to the oil return port, ultimately realizing the continuity of the oil return path. The oil hole 134 can be opened along the outer wall of the bearing 132, or can be opened axially downward from the upper end surface of the bearing 132.

[0056] In a specific embodiment, the inner wall of the oil separation cavity 11 is paved with an oil separation ring 15. The oil separation ring 15 is closely attached to the circumferential paving of the inner wall of the oil separation cavity 11, and its surface properties (such as oleophilic material or microstructure) enhance the adsorption capacity of the oil droplets after centrifugal separation, making the oil droplets thrown to the cavity wall more easily coalesced to form an oil film; at the same time, the continuous oil film channel formed on the surface of the oil separation ring 15 guides the lubricating oil to stably flow in the direction of gravity to the oil return port, avoiding the retention or secondary atomization of oil droplets on the cavity wall, directly improving the oil return efficiency.

[0057] The oil separation ring 15 is a whole annular sheet or includes a plurality of annular array arc-shaped sub-pieces.

[0058] When the oil separation ring 15 adopts a whole annular sheet structure, its continuous annular surface provides a uniform and stable adhesion surface for the separated lubricating oil, ensuring that the oil droplets quickly coalesce to form a complete oil film on the entire circumferential direction of the cavity wall, and are efficiently guided to the oil return port through the annular channel; when a plurality of annular array arc-shaped sub-piece combination structures are adopted, the gap between the sub-pieces can adapt to the thermal deformation stress of the inner wall of the oil separation cavity 11, avoiding cracking of the whole ring due to temperature rise, and the capillary effect formed by the array gap enhances the adsorption capacity of the oil droplets, and the modular design of the sub-pieces facilitates local maintenance and replacement.

[0059] Embodiment 2

[0060] The embodiment provides a compressor, such as Figures 7-9 As shown, the compressor includes a shell 2, a front end cover 3, a bracket 4, a dynamic disc 5 and a static disc 6 arranged in the shell 2, the front end cover 3 is provided with an oil separation cavity 11, the oil separation structure 1 as described in embodiment 1 is installed in the oil separation cavity 11, the static disc 6 is fixed on the inner side end face of the front end cover 3, the dynamic disc 5 is installed on the bracket 4, and the back pressure cavity 7 is formed between the dynamic disc 5 and the bracket 4.

[0061] In the overall structure of the compressor, the shell 2 serves as an external sealed container, and the front end thereof is connected to the front end cover 3 by bolt fixation to form a closed cavity; the front end cover 3 is internally processed with an oil separation cavity 11, and the oil separation structure 1 is installed in the oil separation cavity 11; the static disc 6 is vertically fixed on the inner side end face of the front end cover 3 by bolts; the support 4 is coaxially arranged behind the static disc 6, and the dynamic disc 5 is installed on the front end face of the support 4 by an eccentric mechanism; the annular gap between the dynamic disc 5 and the support 4 forms a back pressure cavity 7; the rotating shaft 131 of the oil separation structure 1 is supported on the front end cover 3 by bearings 132, the driving unit 12 of the oil separation structure 1 is located at the lower part of the oil separation cavity 11 close to the air inlet 111, and the separation unit 14 is located at the upper part of the oil separation cavity 11 close to the air outlet area.

[0062] The shell 2 provides overall support and sealed environment for the compressor; the front end cover 3 serves as the end cover of the high-pressure cavity, and the built-in oil separation cavity 11 is used to accommodate and fix the oil separation structure 1; the static disc 6 and the dynamic disc 5 are engaged with each other to form a compression cavity, so as to realize compression of refrigerant gas; the support 4 supports the movement mechanism of the dynamic disc 5 and forms the boundary of the back pressure cavity 7; the back pressure cavity 7 provides axial sealing force for the dynamic disc 5 and serves as a lubricating oil return channel; the oil separation structure 1 is driven to rotate by the fluid kinetic energy of the oil-gas mixture, and high-efficiency oil-gas separation is realized by centrifugal action and mechanical cutting; the oil separation cavity 11 provides specific flow channel space for oil-gas separation, so as to ensure that the mixture flows through the oil separation structure 1 in an orderly manner.

[0063] The refrigerant gas enters the dynamic disc 5 through the air inlet of the shell 2, is compressed into a high-pressure oil-gas mixture in the engagement cavity of the dynamic disc 5 and the static disc 6, and the mixture enters the oil separation cavity 11 tangentially through the air inlet 111 of the oil separation cavity of the front end cover 3; the high-speed airflow impacts the driving unit 12 of the oil separation structure 1 to make it rotate, and the torque is transmitted to the separation unit 14 through the connecting unit 13; the rotating separation unit 14 cuts oil droplets and enhances centrifugal force, so that the oil droplets are thrown onto the oil separation ring pieces 15 on the inner wall of the oil separation cavity 11 to coalesce, the lubricating oil flows along the cavity wall to the oil return port, and finally enters the back pressure cavity 7 through the static disc oil return channel to lubricate the moving parts; the separated gas is discharged from the air outlet of the front end cover. In this process, the oil separation structure 1 realizes zero additional energy consumption separation by using fluid self-driving force; the cutting and centrifugal double action significantly improves the separation efficiency and reduces the oil content of the exhaust gas; the back pressure cavity 7 serves as an oil collection cavity to realize closed-loop circulation of lubricating oil, thereby reducing oil consumption and improving the reliability of the compressor.

[0064] In specific embodiments, as shown in Figure 7 and Figure 8 , the front end cover 3 is provided with an oil return port 31 and an air outlet 32, and the lubricating oil in the oil-gas mixture flows to the friction pair of the compressor and the back pressure cavity 7 through the oil return channel 8 after passing through the oil return port 31, and the gas in the oil-gas mixture is discharged through the air outlet 32 and then recycled.

[0065] The oil return port 31 is arranged at the bottom of the oil distribution chamber 11 of the front end cover 3. The effect is to collect the lubricating oil flowing along the cavity wall after being adsorbed and converged by the oil distribution ring 15, and to direct the lubricating oil to the compressor friction pair (such as the bearing) and the back pressure chamber 7 through the connected oil return channel 8, so as to realize the closed loop circulation of the lubricating oil, reduce the loss of refrigeration oil, and ensure the lubrication reliability of the moving parts; the exhaust port 32 is arranged at the top of the front end cover 3 away from the oil return port 31. The effect is to concentrate and guide the pure gas separated by the oil distribution structure 1 out of the compressor, so as to ensure that the content of lubricating oil in the exhaust gas is significantly reduced, prevent the lubricating oil from entering the refrigeration system and causing the performance of the condenser or evaporator to be reduced, and at the same time maintain the circulation efficiency of the system refrigerant.

[0066] In specific embodiments, as shown in Figure 9 The oil return channel 8 includes a first oil return channel 81, a second oil return channel 82 and a third oil return channel 83. The first oil return channel 81 is arranged in the first direction in the static disc 6, the second oil return channel 82 is arranged in the second direction in the static disc 6, and the third oil return channel 83 is arranged on the support 4, and the first oil return channel 81, the second oil return channel 82 and the third oil return channel 83 are sequentially communicated.

[0067] The first oil return channel 81 is arranged in the axial direction of the static disc 6, vertically guides the lubricating oil collected by the oil return port 31 of the front end cover 3 into the interior of the static disc 6, and avoids the leakage risk caused by the exposed oil path; the second oil return channel 82 is radially extended in the interior of the static disc 6, and is orthogonally communicated with the first oil return channel 81, so as to realize the spatial conversion of the flow direction of the lubricating oil, and accurately guide the oil flow to the assembly surface of the support 4; the third oil return channel 83 is arranged at the corresponding position of the support 4, receives the radial oil flow of the second oil return channel 82, and directly communicates with the back pressure chamber 7, so as to complete the final delivery of the lubricating oil from the separation chamber to the pressure chamber. The three are connected in three sections of axial-radial-axial space, and the shortest oil return path is constructed in the compact compressor, the flow resistance of the lubricating oil is significantly reduced, the assembly interface of the static disc 6 and the support 4 is sealed to prevent leakage, and finally the separated lubricating oil is efficiently and stably delivered to the back pressure chamber 7 to lubricate the bearing and the friction pair.

[0068] The refrigerant gas enters the compressor from the suction port of the shell 2, is compressed by the meshing of the dynamic disc 5 and the static disc 6 to form a high-pressure oil-gas mixture; the mixture is tangentially injected into the gas inlet 111 of the oil separation cavity 11 of the front end cover 3, pushes the second vane 121 of the driving unit 12 to rotate, and the torque is transmitted to the separation unit 14 through the rotating shaft 131 of the connecting unit 13; the rotating shaft 131 is supported by the bearing 132 and is axially limited by the shaft shoulder 133, which ensures the high-speed rotation of the first vane 1411 of the separation unit 14; the cutting module 142 at the edge breaks the oil droplets, and the centrifugal force throws the oil droplets to the inner wall of the oil separation cavity 11; the oil droplets are adsorbed by the oil separation ring 15 and guided to flow along the cavity wall to the oil return port 31 of the front end cover 3; the lubricating oil flows through the first oil return channel 81 axial section, the second oil return channel 82 radial section in the static disc 6 and the third oil return channel 83 of the support 4 in turn, and finally enters the back pressure cavity 7 to lubricate the friction pair and maintain the back pressure of the dynamic disc 5; the separated pure gas is discharged from the exhaust port 32 of the front end cover 3. The above process realizes the efficient separation of oil and gas with zero additional energy consumption through the self-driven oil separation structure 1, the three-stage oil return channel guarantees the closed-loop circulation of the lubricating oil, and finally achieves the core effect of reducing the oil content of the exhaust gas, reducing the lubricating oil consumption and improving the reliability of the compressor.

[0069] In summary, those skilled in the art can easily understand that the above advantageous technical features can be freely combined and superimposed without conflict.

[0070] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A structure for separating oil, characterized by, The oil separation structure comprises an oil separation cavity, a driving unit, a connecting unit and a separation unit arranged in the oil separation cavity, the driving unit is arranged on the connecting unit and can drive the connecting unit to rotate, the separation unit is arranged on the connecting unit and can rotate with the connecting unit; the oil separation cavity is provided with an air inlet, and the oil-gas mixture passes through the air inlet to drive the driving unit to rotate, thereby driving the separation unit to rotate through the connecting unit, and the separation unit can act on the oil-gas mixture when rotating; The separation unit comprises a rotating body and a cutting module, the rotating body is fixed on the connecting unit and rotates with the connecting unit, and the cutting module is arranged at the edge of the rotating body and is used for breaking oil droplets in the oil-gas mixture; The driving unit comprises a plurality of second blades arranged around the outer wall of the connecting unit, and the end of the second blade away from the connecting unit is provided with an inclined surface, and the oil-gas mixture acts on the inclined surface through the air inlet to drive the second blade to rotate; The rotating body is a first blade extending in a radial direction; and the cutting module is a protrusion arranged at the edge of the first blade.

2. The oil separation structure according to claim 1, characterized by A plurality of first blades are arranged, and the plurality of first blades are distributed in the circumferential direction of the connecting unit.

3. The oil separation structure according to claim 1, characterized by The protrusion is sawtooth-shaped or trapezoidal, and when the protrusion is sawtooth-shaped, the tip angle α satisfies 10° < α < 60°.

4. The oil separation structure according to claim 1, characterized by The connecting unit comprises a rotating shaft and a bearing, the rotating shaft is provided with a shaft shoulder, the rotating shaft cooperates with the bearing and is limited by the shaft shoulder; the driving unit and the separation unit are both fixed on the rotating shaft.

5. The oil separation structure according to claim 4, characterized by The outer wall of the bearing is provided with a plurality of oil flow holes opened in the circumferential direction, so that the separated lubricating oil can flow up and down along the inner wall of the oil separation cavity.

6. The oil separation structure according to claim 1, wherein The inner wall of the oil separation cavity is paved with an oil separation ring piece; the oil separation ring piece is an integral annular sheet or comprises a plurality of arc-shaped sub-pieces arranged in an annular array.

7. A compressor characterized by, The compressor comprises a shell, a front end cover, a support, a dynamic disc and a static disc arranged in the shell, the front end cover is provided with an oil separation cavity, the oil separation structure as claimed in any one of claims 1-6 is installed in the oil separation cavity, the static disc is fixed on the inner side end face of the front end cover, the dynamic disc is installed on the support, and a back pressure cavity is formed between the dynamic disc and the support.

8. The compressor of claim 7, wherein, The front end cover is provided with an oil return port and an exhaust port, lubricating oil in the oil-gas mixture flows to the friction pair and the back pressure cavity of the compressor through the oil return channel after passing through the oil return port, and gas in the oil-gas mixture is discharged through the exhaust port and recycled.

9. The compressor of claim 8, wherein, The oil return channel comprises a first oil return channel, a second oil return channel and a third oil return channel, the first oil return channel is opened in the static disc in a first direction, the second oil return channel is opened in the static disc in a second direction, and the third oil return channel is opened on the support, and the first oil return channel, the second oil return channel and the third oil return channel are sequentially communicated.

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