Oil-gas separation device and screw unit with same

Abstract

The oil-gas separation device comprises a flow guide component which is located in a shell, a gas inlet is formed in the shell, the flow guide component is provided with a flow guide channel, an inlet of the flow guide channel is communicated with the gas inlet, and an outlet of the flow guide channel faces the bottom of the shell. The separation component is located in the flow guide channel and provided with a protruding part, and the protruding part protrudes in the direction opposite to the advancing direction of the oil-gas mixture. According to the oil-gas separator, oil-gas mixtures can collide with the protruding parts in a front-face mode when flowing through the separating part, the collision area is larger, the protruding parts can better guide the flow direction of gas flow, the collision opportunity of oil drops is increased, and therefore the oil drops can be efficiently separated from refrigerants. And meanwhile, the flow speed of the air flow is greatly reduced due to direct front collision, so that the air flow does not form large impact on refrigerant oil at the bottom of the shell, liquid level fluctuation and foam generation can be avoided, and the oil return efficiency of the unit is basically not influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioners, and particularly relates to an oil-gas separation device and a screw unit having the same. Background Art

[0002] For a water-cooled screw unit, its compressor needs refrigerating oil for cooling, lubrication and sealing during operation. Limited by the compressor size, the efficiency of the internally integrated oil separator is not sufficient to ensure that all refrigerating oil circulates in the compressor, that is, part of the refrigerating oil will be mixed into the refrigerant vapor discharged from the compressor in the form of oil droplets, thus participating in the system cycle. If this part of the refrigerating oil is not recovered to the compressor in time, two major problems will occur. First, as the operation time increases, the compressor will gradually experience an oil shortage problem, resulting in shutdown or even burnout. Second, if this part of the refrigerating oil enters the system cycle, it will accumulate in the evaporator, thus greatly reducing the performance of the heat exchanger. Research shows that when the refrigerating oil content in the evaporator reaches 1%, the refrigerating capacity will be reduced by 18%. And due to the gradual miniaturization of the compressor, its internal integrated oil separator is being gradually cancelled. To ensure the normal operation of the unit, an oil separator is usually set between the compressor and the condenser, and its separation function is relied on to separate the refrigerating oil from the refrigerant vapor to prevent the refrigerating oil from participating in the system cycle. At the same time, the separated refrigerating oil is transported to the compressor in time to avoid damage to the compressor caused by oil shortage.

[0003] However, in the prior art, the oil-gas separation device usually combines multiple separation methods such as gravity, centrifugal force and inertia for oil-gas separation, which requires a strong swirling motion generated by high-speed air flow entering the inside of the separation device to achieve high-efficiency separation. This method not only damages the separation components of the oil separation filter element, but also due to the high gas flow rate in the oil-gas separation device, the gaseous refrigerant is easy to impact the refrigerating oil collected at the bottom of the container, resulting in liquid level fluctuations and foam generation, reducing the oil return efficiency of the unit's oil return pipe, and at the same time affecting the stable operation state of the liquid level gauge or oil level mirror, and further causing faults such as system false alarms. Summary of the Utility Model

[0004] Therefore, the utility model provides an oil-gas separation device, which can solve the technical problem that the existing oil-gas separation device needs to rely on high-speed air flow entering the inside of the separation device to generate a strong swirling motion for high-efficiency separation, and the high gas flow rate in the oil-gas separation device is easy to impact the refrigerating oil collected at the bottom of the container, resulting in liquid level fluctuations and foam generation, thereby reducing the oil return efficiency of the unit's oil return pipe.

[0005] To solve the above problems, the present utility model provides an oil-gas separation device, comprising: a housing, a guiding component, and a separating component. The guiding component is disposed inside the housing. An air inlet is provided on the housing. The guiding component has a guiding channel with an inlet and an outlet. The inlet is in communication with the air inlet, and the outlet faces the bottom of the housing. The separating component is disposed inside the guiding channel. The oil-gas mixture flows into the guiding channel from the air inlet and flows out of the guiding channel after passing through the separating component. The separating component has a protruding portion that bulges in a direction opposite to the traveling direction of the oil-gas mixture.

[0006] In some embodiments, in the direction of the traveling of the oil-gas mixture, the cross-sectional area of the protruding portion gradually increases.

[0007] In some embodiments, the shape of the protruding portion is conical, and the tip of the cone points in a direction opposite to the traveling direction of the oil-gas mixture.

[0008] In some embodiments, the guiding component further has an oil guiding portion connected to the protruding portion. The oil guiding portion surrounds the protruding portion for one week. The outer edge of the oil guiding portion is in contact with the inner surface of the guiding component, and the oil guiding portion inclines towards the bottom of the housing. An aisle penetrating the oil guiding portion is configured on the oil guiding portion.

[0009] In some embodiments, the aisle is a notch at the outer edge of the oil guiding portion. The number of the notches is multiple, and the notches are spaced apart along the outer edge of the oil guiding portion.

[0010] In some embodiments, the guiding component includes a radially extending section and an axially extending portion connected to each other. The radially extending section extends along the radial direction of the housing, and the axially extending portion extends along the axial direction of the housing. One end of the radially extending section away from the axially extending portion forms the inlet, and one end of the axially extending portion away from the radially extending section has the outlet. The separating component is disposed inside the axially extending portion.

[0011] In some embodiments, an end plate is provided at one end of the axially extending portion away from the radially extending section. The outlet is configured on the end plate, and the number of the outlets is multiple. The outlets are spaced apart on the end plate.

[0012] In some embodiments, the axially extending portion has an enlarged section. In the direction of the traveling of the oil-gas mixture, the inner diameter of the enlarged section gradually increases. The separating component is disposed inside the enlarged section.

[0013] In some embodiments, the axially extending portion has a constricted section. In the direction of the traveling of the oil-gas mixture, the inner diameter of the constricted section gradually decreases. The constricted section is upstream of the enlarged section.

[0014] In some embodiments, an air outlet is provided at the top of the housing. A cylinder is further provided inside the housing. At least a partial section of the flow guiding member is located inside the cylinder, and the outlet is inside the cylinder. The cylinder has an opening facing the air outlet, and an oil dripping hole is formed at the bottom of the cylinder.

[0015] The present invention further provides a screw compressor unit, including the aforementioned oil-gas separation device.

[0016] The oil-gas separation device and the screw compressor unit having the same provided by the present utility model have the following beneficial effects:

[0017] Since the flow guiding member located inside the housing has a flow guiding channel, and the inlet of the flow guiding channel is communicated with the air inlet of the housing, and the separating member is arranged in the flow guiding channel of the flow guiding member, when the oil-gas mixture flows in from the air inlet, it will directly enter the flow guiding channel of the flow guiding member, then flow through the separating member and flow out from the flow guiding channel. Also, because the convex portion of the separating member bulges in the direction opposite to the traveling direction of the oil-gas mixture, the oil-gas mixture will collide head-on with the convex portion when flowing through the separating member, and the airflow after the collision will impact the inner surface of the flow guiding member, thereby increasing the collision area. At the same time, with the help of centrifugal force and gravity, and the convex portion can better guide the airflow direction, increasing the oil droplet collision opportunity, so that the refrigerant oil droplets can be efficiently separated from the refrigerant vapor, improving the separation effect. After the oil-gas mixture flows through the separating member, due to the direct head-on collision, the airflow velocity drops significantly, weakening the impact of the high-speed airflow on the oil droplets that have accumulated in the oil storage area below the housing, preventing the oil droplets from re-mixing with the gas to generate foam due to the high-speed impact of the airflow, thereby further improving the oil-gas separation effect and ensuring the oil return efficiency of the unit. At the same time, this also ensures that the operation state of the liquid level gauge or the oil level mirror will not be affected, and no false alarm of the system will occur. That is, the oil-gas separation device of the present application can improve the oil-gas separation effect while avoiding a large impact of the high-speed airflow on the refrigerant oil collected at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0019] Figure 1 It is a cross-sectional view of the oil-gas separation device according to the embodiment of the present utility model;

[0020] Figure 2A cross-sectional view of the flow guiding component and the separation component of the oil-gas separation device according to an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of the separation component of the oil-gas separation device according to an embodiment of the present invention;

[0022] Figure 4 A front view of the separation component of the oil-gas separation device according to an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the flow guiding component of the oil-gas separation device according to an embodiment of the present invention;

[0024] Figure 6 A structural schematic diagram of the flow guiding component of the oil-gas separation device according to an embodiment of the present invention;

[0025] Figure 7 A structural schematic diagram of the cylinder body of the oil-gas separation device according to an embodiment of the present invention;

[0026] Figure 8 A bottom view of the cylinder body of the oil-gas separation device according to an embodiment of the present invention;

[0027] Figure 9 A cross-sectional view of the oil-gas separation device in the prior art.

[0028] The reference numerals are shown as:

[0029] 1. Housing; 2. Flow guiding component; 21. Radial section; 22. End plate; 23. Contraction section; 24. Expansion section; 3. Separation component; 31. Protrusion; 32. Oil guiding part; 4. Air inlet; 5. Outlet; 6. Notch; 7. Air outlet; 8. Cylinder body; 9. Oil dripping hole; 10. Oil separation filter screen; 11. Oil return port; 12. Cylinder; 13. Oil baffle; 14. Oil level; 15. Foam. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0032] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0033] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0034] Referring to Figures 1 to 9 As shown, according to an embodiment of the present utility model, an oil-gas separation device is provided, including: a housing 1, a diversion component 2 and a separation component 3. The diversion component 2 is inside the housing 1. An air inlet 4 is provided on the housing 1. The diversion component 2 has a diversion channel, and the diversion channel has an inlet and an outlet 5. The inlet is communicated with the air inlet 4, and the outlet 5 faces the bottom of the housing 1. The separation component 3 is inside the diversion channel. The oil-gas mixture flows into the diversion channel from the air inlet 4 and flows out of the diversion channel after flowing through the separation component 3. The separation component 3 has a convex portion 31, and the convex portion 31 bulges in the direction opposite to the traveling direction of the oil-gas mixture.

[0035] In this technical solution, since the flow guiding component 2 located inside the housing 1 has a flow guiding channel, and the inlet of the flow guiding channel is communicated with the air inlet 4 of the housing 1, and at the same time the separation component 3 is arranged in the flow guiding channel of the flow guiding component 2, when the oil-gas mixture flows in from the air inlet 4, it will directly enter the flow guiding channel of the flow guiding component 2, then flow through the separation component 3 and flow out from the flow guiding channel. Also, because the convex part 31 of the separation component 3 bulges in the direction opposite to the traveling direction of the oil-gas mixture, when the oil-gas mixture flows through the separation component 3, it will collide head-on with the convex part 31. The airflow after the collision will impact the inner surface of the flow guiding component 2, thereby increasing the collision area. At the same time, with the help of centrifugal force, gravity, and the fact that the convex part 31 can better guide the airflow direction, the chance of oil droplet collision is increased, so that the refrigerant oil droplets can be efficiently separated from the refrigerant vapor, improving the separation effect. After the oil-gas mixture flows through the separation component 3, due to the direct head-on collision, the airflow velocity drops significantly, weakening the impact of the high-speed airflow on the oil droplets that have accumulated in the oil storage area below the housing 1, preventing the oil droplets from being remixed with the gas to generate foam due to the high-speed impact of the airflow, thereby further improving the oil-gas separation effect and ensuring the oil return efficiency of the unit. At the same time, this also ensures that the operating state of the liquid level gauge or oil level mirror will not be affected, and the situation of system false alarm will not occur. That is to say, while improving the oil-gas separation effect, the oil-gas separation device of the present application can also avoid a large impact of the high-speed airflow on the refrigerant oil collected at the bottom.

[0036] Figure 9 FIG. 4 is a schematic diagram of a conventional vertical oil separator device. When the oil-gas mixture enters the housing 1 through the air inlet 4, the oil-gas mixture will spiral downward along the outer circumferential surface of the cylinder 12. During this process, oil-gas separation is carried out by relying on various separation methods such as gravity, centrifugal force, and inertia. If you want to improve the oil-gas separation effect, it is necessary to increase the flow velocity of the oil-gas mixture entering the housing 1. After the flow velocity of the oil-gas mixture increases, the high-speed airflow will have a large impact on the refrigerant oil collected in the lower oil storage area. Even if there is an oil baffle 13 above the oil storage area, it will not help. The large impact will cause the oil level 14 to fluctuate up and down. At the same time, a large amount of bubbles will be mixed in the oil and foam 15 will be generated, thereby reducing the separation effect. More seriously, the fluctuation of the refrigerant oil will even cause the oil level 14 to be higher than the control height (usually using an optoelectronic oil level switch, etc. to control the oil level), thereby causing false alarms and resulting in refrigeration system failures, etc. The oil-gas separation device of the present application just solves these problems existing in the existing oil-gas separation devices.

[0037] As a specific embodiment, in the direction of the flow of the oil-gas mixture, the cross-sectional area of the convex portion 31 gradually increases. Such a design of the convex portion 31 can ensure that when the oil-gas mixture flows through the convex portion 31, it can fully impact the outer surface of the convex portion 31, thereby ensuring the collision area, helping to capture and aggregate oil droplets, and further ensuring the oil-gas separation effect. In contrast, if the convex portion 31 is spherical, in the direction of the flow of the oil-gas mixture, the cross-sectional area of the convex portion 31 first increases and then decreases, then the air flow will only impact the front half of the convex portion 31, and the rear half will not be impacted by the air flow, so the collision area cannot be ensured.

[0038] Referring to Figure 2 and Figure 3 As shown, the outer shape of the convex portion 31 is conical, and the tip of the cone points in the direction opposite to the flow of the oil-gas mixture. The conical outer shape of the convex portion 31 indicates that the convex portion 31 has a gradually expanding and smooth outer surface. In this way, while ensuring the collision area, it also has a good guiding effect and can well guide the flow direction of the incoming air flow. Among them, the convex portion 31 can be a hollow conical shape, which can reduce the weight and material consumption.

[0039] Referring to Figure 3 and Figure 4 As shown, the flow guiding component 2 also has an oil guiding portion 32 connected to the convex portion 31. The oil guiding portion 32 surrounds the convex portion 31 for one week. The outer edge of the oil guiding portion 32 contacts the inner surface of the flow guiding component 2, and the oil guiding portion 32 inclines towards the bottom of the housing 1. An aisle penetrating the oil guiding portion 32 is formed on the oil guiding portion 32.

[0040] In this embodiment, the oil droplets captured by the convex portion 31 will flow to the oil guiding portion 32 and drip into the oil storage area at the bottom of the housing 1 through the aisle of the oil guiding portion 32. At the same time, the oil guiding portion 32 will also obstruct the oil-gas mixture, further reducing the air flow velocity. Among them, the oil guiding portion 32 can be a baffle with a relatively small inclination angle, and spot welding can be performed at the contact between the outer edge of the oil guiding portion 32 and the inner surface of the flow guiding component 2 to fix the separation component 3 in the flow guiding component 2.

[0041] Referring to Figures 2 to 4 As shown, the aisle is a notch 6 at the outer edge of the oil guiding portion 32. The number of notches 6 is multiple, and the notches 6 are spaced along the outer edge of the oil guiding portion 32.

[0042] In this technical solution, after the oil-gas mixture impacts the convex portion 31, the air flow will travel around. After hitting the inner surface of the flow guiding component 2, it will basically travel along the inner surface of the flow guiding component 2 adhering to the wall. When the passage is the notch 6 at the outer edge of the oil guiding portion 32, it is more conducive to the separated air flow flowing out from each notch 6. Moreover, when the passage is the notch 6 at the outer edge of the oil guiding portion 32, since the oil guiding portion 32 is inclined towards the bottom of the housing 1, it can also ensure that the oil droplets guided by the oil guiding portion 32 can all drip into the oil storage area at the bottom of the housing 1 from each notch 6.

[0043] Referring to Figure 1 and Figure 2 As shown, the flow guiding component 2 includes an adjacent radial section 21 and an axial part. The radial section 21 extends along the radial direction of the housing 1, and the axial part extends along the axial direction of the housing 1. One end of the radial section 21 away from the axial part forms the inlet of the flow guiding channel, and one end of the axial part away from the radial section 21 has an outlet 5. The separating component 3 is located inside the axial part.

[0044] In this embodiment, the air inlet 4 is arranged on the side surface of the housing 1. Designing the flow guiding component 2 as an adjacent radial section 21 and an axial part is convenient for processing. At the same time, designing the separating component 3 inside the axial part helps the separated oil droplets to drip smoothly into the oil storage area at the bottom of the housing 1 under the action of gravity.

[0045] Referring to Figure 6 As shown, an end plate 22 is arranged at one end of the axial part away from the radial section 21. The outlet 5 is formed on the end plate 22, and the number of outlets 5 is multiple. Each outlet 5 is distributed at intervals on the end plate 22.

[0046] In this technical solution, the end plate 22 can once again obstruct the air flow, thereby further weakening the flow rate of the air flow and further ensuring that the air flow will not cause a large impact on the refrigeration oil gathered at the bottom. At the same time, the outlets 5 are designed as multiple and distributed at intervals on the end plate 22, which also has a dispersing effect on the air flow, making the air flow into multiple dispersed strands, and can also reduce the impact of the air flow on the refrigeration oil gathered at the bottom. Further, the multiple outlets 5 also provide more paths for the separated oil droplets to choose, and can ensure that the oil droplets drip into the oil storage area at the bottom of the housing 1 in time.

[0047] Referring to Figure 4 As shown, the axial part also has an enlarged section 24. Along the direction of the travel of the oil-gas mixture, the inner diameter of the enlarged section 24 gradually increases. The separating component 3 is located inside the enlarged section 24.

[0048] In this technical solution, when the oil-gas mixture enters the expansion section 24, the expansion of the space causes the pressure and velocity of the air flow to decrease, which can prevent the too-fast flow velocity from re-entraining the oil droplets already captured on the convex portion 31 into the air flow and affecting the oil-gas separation effect. It should be noted that after being guided by the conical convex portion 31, the oil-gas mixture will spread around. The large oil droplets in the refrigerant vapor flow along the inner surface of the expansion section 24 in the air flow direction under the action of centrifugal force and flow out through the notch 6 at the outer edge of the oil guide portion 32. The small oil droplets are too light and are pushed towards the conical convex portion 31 to gradually form vortex aggregation. After aggregating into large oil droplets, they flow to the oil guide portion 32 and then flow out through the notch 6.

[0049] Referring to Figure 2 、 Figure 5 and Figure 6 As shown, the axial part has a contraction section 23. In the direction of the travel of the oil-gas mixture, the inner diameter of the contraction section 23 gradually decreases, and the contraction section 23 is upstream of the expansion section 24.

[0050] In this embodiment, by designing the contraction section 23, the oil-gas mixture can be accelerated before impacting the convex portion 31, avoiding the expansion section 24 from reducing the gas flow velocity too much and affecting the impact effect between the oil-gas mixture and the convex portion 31, and further affecting the oil-gas separation effect. That is, the contraction section 23 first accelerates the air flow, and then the expansion section 24 decelerates the air flow. In this way, it can not only ensure that the oil-gas mixture has a certain speed to impact the convex portion 31 to achieve good oil-gas separation, but also the air flow velocity is not too fast to roll up the separated oil droplets.

[0051] Referring to Figure 1 and Figure 4 As shown, an air outlet 7 is provided at the top of the housing 1. A cylinder 8 is also provided in the housing 1. At least a part of the flow guiding member 2 is located in the cylinder 8, and the outlet 5 is located in the cylinder 8. The cylinder 8 has an opening facing the air outlet 7, and an oil dripping hole 9 is formed at the bottom of the cylinder 8.

[0052] In this technical solution, the cylinder 8 has the function of guiding the air flow, which can change the downward flow direction of the air flow discharged from the flow guiding member 2 to an upward travel, so as to ensure that the separated refrigerant gas is smoothly discharged from the air outlet 7 at the top. Moreover, the cylinder 8 changing the air flow direction can also prevent the air flow from impacting the refrigeration oil collected at the bottom of the housing 1 downward. It can be understood that the oil droplets discharged from the flow guiding member 2 will drip into the oil collecting area at the bottom of the housing 1 through the oil dripping hole 9. Of course, a small amount of air flow will also be discharged from the oil dripping hole 9. Since the flow velocity of the air flow is very small and the density is also very small at this time, this part of the air flow will basically not cause a substantial impact on the refrigeration oil collected at the bottom of the housing 1, so it can be ignored.

[0053] It should also be noted that one end of the radial section 21 away from the axial part can be welded to the air inlet 4 of the housing 1. An installation notch is formed at the upper edge of the cylinder body 8. The radial section 21 of the flow guiding component 2 is snapped into the installation notch, and the cylinder body 8 and the flow guiding component 2 can be welded at the installation notch, so that both the cylinder body 8 and the flow guiding component 2 can be well fixed in the housing 1.

[0054] Preferably, the number of the oil dripping holes 9 is multiple, and the oil dripping holes 9 are distributed at intervals along the inner edge of the bottom wall of the cylinder body 8, and the bottom wall of the cylinder body 8 bulges upward. In this way, even if the end plate 22 of the flow guiding component 2 contacts the bottom wall of the cylinder body 8, because the bottom wall of the cylinder body 8 bulges upward, space can be vacated to enable the separated oil droplets and the separated air flow to flow out from the respective outlets 5 on the end plate 22. At the same time, the upward bulge of the bottom wall of the cylinder body 8 is also beneficial to the oil droplets to slide down into the respective oil dripping holes 9 under the action of gravity, so that the oil droplets can smoothly drip into the oil collecting area at the bottom of the housing 1.

[0055] See Figure 1 As shown, an oil separation filter screen 10 is further arranged in the housing 1. The oil separation filter screen 10 is located between the cylinder body 8 and the air outlet 7. The separated refrigerant gas flow rises and passes through the oil separation filter screen 10. The oil separation filter screen 10 captures and aggregates the oil droplets in the refrigerant vapor again. The aggregated oil droplets flow into the oil collecting area at the bottom of the housing 1 through the oil dripping holes 9 at the bottom of the cylinder body 8 or the inner surface of the housing 1. After secondary separation, purer refrigerant vapor is discharged from the upper air outlet 7, improving the oil-gas separation effect.

[0056] The present invention also provides a screw compressor unit, including the aforementioned oil-gas separation device. The screw compressor unit can be a water-cooled screw compressor unit or an air-cooled screw compressor unit. Finally, it should be noted that an oil return port 11 is arranged at a position close to the bottom of the housing 1. The refrigeration oil collected at the bottom of the housing 1 will be returned to the compressor of the screw compressor unit through the oil return port 11, and the oil-gas separation device is arranged between the compressor and the condenser of the screw compressor unit.

[0057] It is easy for those skilled in the art to understand that on the premise of no conflict, the advantageous technical features of the above-mentioned various methods can be freely combined and superimposed.

[0058] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An oil-gas separation device, characterized in that: The invention comprises a housing (1), a flow guide component (2) and a separation component (3), wherein the flow guide component (2) is located inside the housing (1), an air inlet (4) is provided on the housing (1), the flow guide component (2) has a flow guide channel, the flow guide channel has an inlet and an outlet (5), the inlet is connected to the air inlet (4), the outlet (5) faces the bottom of the housing (1), the separation component (3) is located inside the flow guide channel, an oil-gas mixture flows into the flow guide channel from the air inlet (4) and flows out of the flow guide channel after flowing through the separation component (3), and the separation component (3) has a protrusion (31), and the protrusion (31) bulges in the direction opposite to the direction in which the oil-gas mixture travels.

2. The oil-gas separation device according to claim 1, characterized in that: Along the direction in which the oil-gas mixture travels, the cross-sectional area of ​​the protrusion (31) gradually increases.

3. The oil-gas separation device according to claim 2, characterized in that: The protrusion (31) is in the shape of a cone, and the tip of the cone points in the opposite direction to the direction in which the oil-gas mixture travels.

4. The oil-gas separation device according to claim 1, characterized in that: The flow guide component (2) further comprises an oil guide portion (32) connected to the protruding portion (31); the oil guide portion (32) surrounds the protruding portion (31); the outer edge of the oil guide portion (32) contacts the inner surface of the flow guide component (2); the oil guide portion (32) is inclined toward the bottom of the housing (1); and a passageway is constructed on the oil guide portion (32) and passes through the oil guide portion (32).

5. The oil-gas separation device according to claim 4, characterized in that: The passage is a notch (6) located at the outer edge of the oil guide portion (32). There are a plurality of notches (6), and the notches (6) are distributed at intervals along the outer edge of the oil guide portion (32).

6. The oil-gas separation device according to claim 1, characterized in that: The flow guide component (2) comprises a radial section (21) and an axial section connected to each other, wherein the radial section (21) extends in the radial direction of the shell (1), and the axial section extends in the axial direction of the shell (1), an end of the radial section (21) away from the axial section forms the inlet, and an end of the axial section away from the radial section (21) has the outlet (5), and the separation component (3) is located in the axial section.

7. The oil-gas separation device according to claim 6, characterized in that: An end plate (22) is provided at one end of the axial portion away from the radial section (21), the outlet (5) is constructed on the end plate (22), and there are a plurality of outlets (5), each of which is spaced apart and distributed on the end plate (22).

8. The oil-gas separation device according to claim 6, characterized in that: The axial portion has an expansion section (24), the inner diameter of which gradually increases along the direction in which the oil-gas mixture travels, and the separation component (3) is located in the expansion section (24).

9. The oil-gas separation device according to claim 8, characterized in that: The axial portion has a contraction section (23), the inner diameter of which gradually decreases along the direction in which the oil-gas mixture travels, and the contraction section (23) is located upstream of the expansion section (24).

10. The oil-gas separation device according to any one of claims 1 to 9, characterized in that: The shell (1) is provided with an air outlet (7) at the top, and a cylinder (8) is also provided inside the shell (1). At least a part of the flow guide component (2) is located inside the cylinder (8), and the outlet (5) is located inside the cylinder (8). The cylinder (8) has an opening facing the air outlet (7), and an oil dripping hole (9) is configured at the bottom of the cylinder (8).

11. A screw unit, comprising the oil-gas separation device according to any one of claims 1 to 10.

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