Oil mist absorption device and external circulation oil system

Abstract

The embodiment of the invention provides an oil mist absorption device and an external circulation oil system. The oil mist absorption device comprises a shell and a cooling pipe fitting. An oil mist cavity, an oil mist inlet and a breathing opening are formed in the shell, the oil mist inlet can be communicated with an oil tank, and the breathing opening is used for air intake and exhaust; the cooling pipe fitting is arranged in the shell, an oil mist flow channel is formed in the area between the cooling pipe fitting and the shell, and the cooling pipe fitting is used for cooling and condensing the oil mist in the oil mist flow channel. And the oil mist entering the oil mist cavity exchanges heat with the cooling pipe fitting in the shell, so that the condensation speed of the oil mist is greatly increased. Therefore, the oil mist absorption device provided by the embodiment of the invention has the advantages of preventing the oil mist from overflowing, reducing the cleaning frequency of the filter element and being long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of power generation, and in particular to an oil mist absorption device and an external circulation oil system having the oil mist absorption device. Background Art

[0002] The bearings of the turbine generator set that adopt the external circulation oil system for cooling will absorb a large amount of heat generated by the bearing pads in various parts during the process of turbine oil circulation cooling the bearings, and the temperature will rise. The oil will flow into the oil collecting tank through the pipeline, and will be agitated during the process of flowing into the oil tank from the pipeline, generating a large amount of oil mist. At the same time, when the turbine oil is pressurized and transported to the bearings in various parts through the circulating oil pump, the absorption effect of the pump will cause a negative pressure area in the oil tank, which will intensify the formation of oil mist. The oil mist will gather in the oil tank and overflow from the seals in various parts of the oil tank.

[0003] In the related art, seals are set at the connection between the oil tank and the accessories (external circulation oil system), the connection between the tank cover and the oil tank, and the contact between the tank cover and the main shaft (the turbine generator bearing with the self-circulation function of the cooling oil system) to form a sealed cavity; the oil mist is confined in the oil tank or the oil tank, but it will cause the oil mist to gather in the sealed cavity, which will increase the pressure in the oil tank. The seal is prone to deformation during long-term use, causing the oil mist to overflow. This will cause turbine oil waste and environmental pollution. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides an oil mist absorption device. The oil mist absorption device has the advantages of preventing oil mist from overflowing, reducing the frequency of filter element cleaning and having a long service life.

[0005] An embodiment of the present invention further provides an external circulation oil system.

[0006] The oil mist absorption device according to the embodiment of the present invention comprises a shell and a cooling pipe.

[0007] The shell is provided with an oil mist chamber, an oil mist inlet and a breathing port, the oil mist inlet can be connected to the oil tank, and the breathing port is used for air intake and exhaust; the cooling pipe is arranged in the shell, and the area between the cooling pipe and the shell forms an oil mist flow channel, and the cooling pipe is used to cool and condense the oil mist in the oil mist flow channel.

[0008] The oil mist absorption device of the embodiment of the present invention is provided with a shell of the oil mist absorption device connected to the oil tank. The oil mist chamber in the shell guides and collects the oil mist overflowing from the oil tank. The oil mist entering the oil mist chamber exchanges heat with the cooling pipe in the shell, thereby greatly improving the condensation speed of the oil mist, thereby preventing the oil mist from overflowing and causing residual droplets on the surface of the filter element, affecting the filtering effect and filtering efficiency, and making it inconvenient to clean and disassemble the filter element. This helps to reduce the frequency of cleaning the filter element. In addition, it also avoids the problem of oil mist leakage caused by the aging of the seal. Therefore, the oil mist absorption device has the advantage of a long service life.

[0009] Therefore, the oil mist absorption device of the embodiment of the present invention has the advantages of preventing oil mist from overflowing, reducing the frequency of filter element cleaning and having a long service life.

[0010] In some embodiments, the cooling tube member includes a first current collector, a plurality of cooling tubes and a second current collector, and the first current collector and the second current collector are connected at both ends of the plurality of cooling tubes in a length direction.

[0011] In some embodiments, the first current collector includes a first current collecting body and a liquid inlet pipe, the first current collecting body has a first current collecting cavity, the first current collecting body is connected to the inner wall of the shell through a connecting ring plate, one end of the plurality of cooling tubes in the length direction is passed through the first current collecting cavity, and one end of the liquid inlet pipe along a direction perpendicular to the height extension direction of the shell is connected to the first current collecting cavity, and the other end of the liquid inlet pipe along a direction perpendicular to the height extension direction of the shell passes out of the shell.

[0012] In some embodiments, the second current collector includes a second current collecting body and a drain pipe, the second current collecting body has a second current collecting cavity, the second current collecting body is connected to the inner wall of the shell through a connecting ring plate, one end of the plurality of cooling tubes in the length direction is passed through the second current collecting cavity, one end of the drain pipe along a direction perpendicular to the height extension direction of the shell is connected to the second current collecting cavity, and the other end of the drain pipe along a direction perpendicular to the height extension direction of the shell passes out of the shell.

[0013] In some embodiments, the oil mist inlet is arranged in the middle area of ​​the bottom of the shell, and the plurality of cooling pipes are arranged in rows, the cooling pipes have multiple rows, and the cooling pipes arranged in multiple rows are arranged in the oil mist chamber in radially divergent directions along the shell.

[0014] In some embodiments, the first current collector, the cooling tube, and the second current collector are all heat-conducting metal tubes.

[0015] In some embodiments, the wall thickness of the cooling tube is greater than 1.8 mm, and the distance between two adjacent cooling tubes is greater than the diameter of the cooling tube.

[0016] In some embodiments, the cooling pipe has a cooling medium, the inlet temperature of the cooling medium should be no greater than 30° C., and the flow rate of the cooling medium should be no less than 3 m / s.

[0017] In some embodiments, the flow direction of the cooling medium is arranged opposite to the dissipation direction of the oil mist.

[0018] In some embodiments, the oil mist absorption device also includes a baffle plate, which is arranged in the oil mist chamber, the baffle plate is connected to the inner wall surface of the shell, and a channel opening is provided on the baffle plate, and the baffle plate extends in a height extension direction perpendicular to the shell so as to isolate the oil mist chamber into multiple oil mist sub-chambers.

[0019] In some embodiments, there are a plurality of baffle plates, the plurality of baffle plates are arranged at intervals along the height direction of the shell, and the plurality of baffle plate channel openings are arranged in a staggered manner.

[0020] In some embodiments, the ratio of the cross-section of the baffle plate to the cross-section of the shell is greater than 2 / 3.

[0021] In some embodiments, the height of one end of the same baffle plate forming the passage opening is lower than the height of other positions of the baffle plate.

[0022] In some embodiments, the oil mist absorption device further comprises a filter screen, wherein the filter screen is disposed in the oil mist chamber, and an outer edge of the filter screen is connected to an inner wall of the shell.

[0023] The external circulation oil system of the embodiment of the present invention comprises an oil tank and an oil mist absorption device according to any one of the above, wherein the oil mist discharge port of the oil tank is connected to the oil mist inlet of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereoscopic diagram of the oil mist absorption device according to the embodiment of the present invention.

[0025] Figure 2 is another stereoscopic view of the oil mist absorption device according to an embodiment of the present invention.

[0026] Figure 3 2 is a top view of the oil mist absorption device according to an embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the internal structure of the oil mist absorption device according to an embodiment of the present invention.

[0028] Figure 5 It is a front view of the oil mist absorption device according to an embodiment of the present invention.

[0029] Figure 6yes Figure 5 Cross-sectional view along the AA direction.

[0030] Reference numerals:

[0031] Shell 1; oil mist chamber 11; oil mist inlet 12; breathing port 13;

[0032] Cooling pipe 2; first current collector 21; liquid inlet pipe 211; cooling pipe 22; second current collector 23; liquid discharge pipe 231;

[0033] Baffle 3;

[0034] Filter 4. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] Reference below Figure 1-Figure 6 The oil mist absorption device and the external circulation oil system according to the embodiment of the present invention are described.

[0037] The oil mist absorption device according to the embodiment of the present invention comprises a shell 1 and a cooling pipe 2 .

[0038] The shell 1 is provided with an oil mist chamber 11, an oil mist inlet 12 and a breathing port 13. The oil mist inlet 12 can be connected to the oil tank, and the breathing port 13 is used for air intake and exhaust. The cooling pipe 2 is arranged in the shell 1, and the area between the cooling pipe 2 and the shell 1 forms an oil mist flow channel. The cooling pipe 2 is used to cool and condense the oil mist in the oil mist flow channel.

[0039] The oil mist absorption device of the embodiment of the present invention is provided with a shell 1 of the oil mist absorption device connected to the oil tank. The oil mist chamber 11 in the shell 1 guides and collects the oil mist overflowing from the oil tank. The oil mist entering the oil mist chamber 11 exchanges heat with the cooling pipe 2 in the shell 1, thereby greatly improving the condensation speed of the oil mist, thereby preventing the oil mist from overflowing and causing residual droplets on the surface of the filter element, affecting the filtering effect and filtering efficiency, and making it inconvenient to clean and disassemble the filter element. As a result, the frequency of cleaning the filter element is reduced. In addition, the problem of oil mist leakage caused by aging of the seal is avoided. Therefore, the oil mist absorption device has the advantage of a long service life.

[0040] Therefore, the oil mist absorption device of the embodiment of the present invention has the advantages of preventing oil mist from overflowing, reducing the frequency of filter element cleaning and having a long service life.

[0041] like Figure 1 and Figure 4As shown, the cooling pipe member 2 includes a first current collector 21 , a plurality of cooling tubes 22 and a second current collector 23 . The first current collector 21 and the second current collector 23 are connected at both ends of the plurality of cooling tubes 22 in the length direction.

[0042] The oil mist absorption device of the embodiment of the present invention divides the cooling pipe 2 into a first current collector 21, a plurality of cooling pipes 22 and a second current collector 23, and the current collectors (the first current collector 21 and the second current collector 23) can be simply connected to the plurality of cooling pipes 22. Therefore, the oil mist absorption device has the advantage of a simple structure.

[0043] like Figure 1 and Figure 4 As shown, the first current collector 21 includes a first current collecting body and a liquid inlet pipe 211. The first current collecting body has a first current collecting cavity. The first current collecting body is connected to the inner wall of the shell 1 through a connecting ring plate. One end of a plurality of cooling tubes 22 in the length direction is passed through the first current collecting cavity, and one end of the liquid inlet pipe 211 along a direction perpendicular to the height extension direction of the shell 1 is connected to the first current collecting cavity, and the other end of the liquid inlet pipe 211 along a direction perpendicular to the height extension direction of the shell 1 passes out of the shell 1.

[0044] The oil mist absorption device of the embodiment of the present invention is formed by dividing the first current collector 21 into a first current collector body and a liquid inlet pipe 211, wherein the first current collector body is connected to the inner wall surface of the shell 1 through a connecting ring plate, and the other end of the liquid inlet pipe 211 passes through the shell 1 along a direction perpendicular to the height extension of the shell 1. Therefore, the oil mist absorption device has the advantages of simple structure and good structural stability.

[0045] like Figure 1 and Figure 4 As shown, the second current collecting body has a second current collecting cavity, the second current collecting body is connected to the inner wall of the shell 1 through a connecting ring plate, one end of the plurality of cooling tubes 22 in the length direction is arranged in the second current collecting cavity, one end of the drain pipe 231 along a direction perpendicular to the height extension direction of the shell 1 is connected to the second current collecting cavity, and the other end of the drain pipe 231 along a direction perpendicular to the height extension direction of the shell 1 passes out of the shell 1. Therefore, the oil mist absorption device has the advantages of simple structure and good structural stability.

[0046] It can be understood that the first current collecting body and the second current collecting body are both arranged in the housing 1 and are arranged opposite to each other along the height direction of the housing.

[0047] like Figure 1 and Figure 6 As shown, the oil mist inlet 12 is arranged in the middle area of ​​the bottom of the shell 1, and a plurality of cooling pipes 22 are arranged in rows. The cooling pipes 22 have multiple rows, and the cooling pipes 2 arranged in multiple rows are arranged in the oil mist chamber 11 along the radial divergence of the shell 1.

[0048] The oil mist absorption device of the embodiment of the present invention is provided with multiple rows of cooling pipes 22 radially divergently arranged in the oil mist chamber 11 (the oil mist in the middle region is relatively concentrated), and the oil mist is dispersed upward from the oil mist inlet 12 and is also mostly concentrated in the middle region. Therefore, the oil mist absorption device can condense the oil mist more evenly.

[0049] The first current collector 21, the cooling tube 22 and the second current collector 23 are all heat-conducting metal tubes. Therefore, the oil mist absorption device has the advantage of good condensation effect. Optionally, the heat-conducting metal tube can be a copper tube.

[0050] The wall thickness of the cooling tube 22 is greater than 1.8 mm, and the distance between two adjacent cooling tubes 22 is greater than the diameter of the cooling tube 22. Therefore, the oil mist absorption device has the advantage of good condensation effect.

[0051] The cooling pipe 2 contains a cooling medium, the inlet temperature of the cooling medium should be no greater than 30° C., and the flow rate of the cooling medium should be no less than 3 m / s. Therefore, the oil mist absorption device has the advantage of good condensation effect.

[0052] like Figure 4 and Figure 6 As shown, the oil mist absorption device of the embodiment of the present invention also includes a baffle plate 3, which is arranged in the oil mist chamber 11, connected to the inner wall surface of the shell 1, and a channel opening is provided on the baffle plate 3, and the baffle plate 3 extends in a height extension direction perpendicular to the shell 1, so as to isolate the oil mist chamber 11 into multiple oil mist sub-chambers.

[0053] The oil mist absorption device of the embodiment of the present invention increases the length of the oil mist flow channel, slows down the oil mist overflow speed, increases the collision probability of the oil mist molecules, and improves the condensation rate by setting the baffle plate 3. Therefore, the oil mist absorption device further improves the effect of oil mist condensation.

[0054] like Figure 4 As shown, there are multiple baffles 3, and the multiple baffles 3 are arranged at intervals along the height direction of the shell 1, and the channel openings of the multiple baffles 3 are arranged in a staggered manner. This helps to further increase the length of the oil mist flow channel and improve the effect of oil mist condensation.

[0055] Furthermore, the passage openings on the adjacent baffle plates 3 are arranged opposite to each other in the radial direction of the housing 1. Thus, the oil mist absorption device helps to further increase the length of the oil mist flow channel and improve the effect of oil mist condensation.

[0056] Furthermore, the number of the baffles 3 may be greater than three, thereby avoiding the problem that the length of the formed oil mist flow path is not too short and causes poor condensation effect.

[0057] like Figure 4As shown, the flow direction of the cooling medium is opposite to the escape direction of the oil mist. Thus, the oil mist absorption device further improves the effect of oil mist condensation.

[0058] The ratio of the cross section of the baffle plate 3 to the cross section of the housing 1 is greater than 2 / 3. Therefore, the oil mist absorption device of the embodiment of the present invention avoids the problem of short oil mist flow path length caused by the excessively large diameter of the oil mist channel opening on the baffle plate 3.

[0059] like Figure 4 As shown, the passage openings on adjacent baffles 3 are arranged opposite to each other in the radial direction of the housing 1. Therefore, the oil mist absorption device of the embodiment of the present invention helps to increase the length of the oil mist flow channel.

[0060] The height of one end of the same baffle plate 3 forming the passage opening is lower than the height of other positions of the baffle plate 3. Therefore, the oil mist absorption device of the embodiment of the present invention can ensure that the oil mist can smoothly flow back to the oil tank after condensation.

[0061] Furthermore, the baffle plate 3 is inclined at an angle of 2-5°.

[0062] Specifically, Figure 1 As shown, the oil mist inlet 12 is arranged at the bottom, and the breathing port 13 is arranged at the top.

[0063] like Figure 4 and Figure 6 As shown, the oil mist absorption device of the embodiment of the present invention further includes a filter screen 4, which is arranged in the oil mist chamber 11 to absorb the oil mist and slow down the flow rate of the oil mist in the flow channel, and the outer edge of the filter screen 4 is connected to the inner wall of the shell 1.

[0064] The oil mist absorption device of the embodiment of the present invention can reduce the flow rate of the oil mist in the flow channel by providing the filter screen 4, so that the oil mist and the cooling pipe 2 can fully exchange heat, thereby helping to improve the effect of condensation reflux.

[0065] Furthermore, the cooling pipe 22 is passed through the filter screen 4. Therefore, the filter screen 4 can be condensed, and the oil mist can be absorbed and the flow rate of the oil mist in the flow channel can be slowed down.

[0066] Furthermore, the filter screen 4 can be a metal sponge layer. Thus, the oil mist absorption device has the advantage of good condensation oil absorption effect.

[0067] The metal sponge mesh is arranged at intervals between the baffles, thereby providing a spatial pressure difference for the fluidity of the oil mist and providing vents for the oil mist to flow.

[0068] For example, the oil mist absorption device of the embodiment of the present invention is installed on the oil tank through a base and sealed on the oil tank by a sealing ring; the oil mist generated in the oil tank flows through the flow channel formed by the shell 1, the baffle plate 3, the filter screen 4, and the cooling pipe 2. The baffle plate 3 changes the oil mist from rising directly to flowing through the multi-layer baffle plates 3 in the shell 1, slowing down the oil mist overflow speed, increasing the collision probability of oil mist molecules, and accelerating the condensation of the oil mist. This is the first oil mist condensation effect; the oil mist flows slowly in the flow channel and is absorbed by the filter 4 (metal sponge filter), accelerating the condensation of the oil mist. This is the second oil mist condensation effect; the cooling liquid (such as cooling water) is introduced into the cooling pipe 2 at the inlet, and the coolant flows through the cooling pipe 2. The oil mist contacts the outer wall of the cooling pipe 2 during the entire oil mist flow channel. The heat is taken away by the cooling water, greatly increasing the condensation speed of the oil mist. This is the third oil mist condensation effect; under the triple condensation effect, the oil mist in the oil tank can be quickly condensed and returned to the oil tank to prevent the poor condensation effect of the oil mist, resulting in a large amount of oil mist overflowing to the outside of the oil tank and contacting with the equipment and the ground for cooling and condensation, polluting the environment. The breathing hole on the top of the shell 1 can also make the oil mist absorption device serve as a tank respirator.

[0069] The external circulation oil system according to the embodiment of the present invention comprises an oil tank and an oil mist absorption device according to any one of the above items, and the oil mist discharge port of the oil tank is connected to the oil mist inlet 12 of the housing 1 .

[0070] Therefore, the oil mist absorption device of the embodiment of the present invention has the advantages of preventing oil mist from overflowing, reducing the frequency of filter element cleaning and having a long service life.

[0071] Furthermore, the oil tank and the oil mist inlet 12 of the housing 1 are connected and sealed via a connecting seat.

[0072] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An oil mist absorption device, characterized in that: include: A housing, wherein the housing has an oil mist chamber, an oil mist inlet and a breathing port, wherein the oil mist inlet can be communicated with the oil tank, and the breathing port is used for air intake and exhaust; A cooling pipe is arranged in the shell, and the area between the cooling pipe and the shell forms an oil mist flow channel. The cooling pipe is used to cool and condense the oil mist in the oil mist flow channel.

2. The oil mist absorption device according to claim 1, characterized in that: The cooling pipe member includes a first current collector, a plurality of cooling pipes and a second current collector. The first current collector and the second current collector are connected at both ends of the plurality of cooling pipes in a length direction.

3. The oil mist absorption device according to claim 2, characterized in that: The first current collector includes a first current collecting body and a liquid inlet pipe, the first current collecting body has a first collecting cavity, the first current collecting body is connected to the inner wall of the shell through a connecting ring plate, one end of the plurality of cooling tubes in the length direction is arranged in the first collecting cavity, and one end of the liquid inlet pipe along a direction perpendicular to the height extension direction of the shell is communicated with the first collecting cavity, and the other end of the liquid inlet pipe along a direction perpendicular to the height extension direction of the shell passes out of the shell; The second current collector includes a second current collecting body and a drain pipe, the second current collecting body has a second current collecting cavity, the second current collecting body is connected to the inner wall of the shell through a connecting ring plate, one end of the plurality of cooling tubes in the length direction is passed through the second current collecting cavity, one end of the drain pipe along a direction perpendicular to the height extension direction of the shell is connected to the second current collecting cavity, and the other end of the drain pipe along a direction perpendicular to the height extension direction of the shell passes out of the shell.

4. The oil mist absorption device according to claim 2, characterized in that: The oil mist inlet is arranged in the middle area of ​​the bottom of the shell, and the plurality of cooling pipes are arranged in a row. The cooling pipes have multiple rows, and the cooling pipes arranged in multiple rows are arranged in the oil mist chamber in a radially divergent manner along the shell; And / or, the first current collector, the cooling tube and the second current collector are all heat-conducting metal tubes.

5. The oil mist absorption device according to claim 2, characterized in that: The wall thickness of the cooling tube is greater than 1.8 mm, and the distance between two adjacent cooling tubes is greater than the tube diameter of the cooling tube; And / or, the cooling pipe has a cooling medium, the inlet temperature of the cooling medium should be no greater than 30° C., and the flow rate of the cooling medium should be no less than 3 m / s; And / or, the flow direction of the cooling medium is arranged opposite to the dissipation direction of the oil mist.

6. The oil mist absorption device according to claim 1, characterized in that: It also includes a baffle plate, which is arranged in the oil mist chamber, connected to the inner wall surface of the shell, and has a channel opening. The baffle plate extends in a direction perpendicular to the height extension of the shell so as to isolate the oil mist chamber into a plurality of oil mist sub-chambers.

7. The oil mist absorption device according to claim 6, characterized in that: There are a plurality of baffle plates, and the baffle plates are arranged at intervals along the height direction of the shell, and the passage openings of the baffle plates are arranged in a staggered manner.

8. The oil mist absorption device according to claim 7, characterized in that: The ratio of the cross section of the baffle plate to the cross section of the shell is greater than 2 / 3; And / or, the height of one end of the same baffle plate forming the passage opening is lower than the height of other positions of the baffle plate.

9. The oil mist absorption device according to any one of claims 1 to 8, characterized in that: It also includes a filter screen, which is arranged in the oil mist chamber, and the outer edge of the filter screen is connected to the inner wall of the shell.

10. An external circulation oil system, characterized in that: It comprises an oil tank and an oil mist absorption device according to any one of claims 1 to 9, wherein the oil mist discharge port of the oil tank is connected to the oil mist inlet of the shell.

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