CN213743588U

CN213743588U - Oil-gas separator and engine

Info

Publication number: CN213743588U
Application number: CN202022586908.9U
Authority: CN
Inventors: 赵娜; 蔡海杰; 赵巍; 秦成旋; 赵利欣
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-07-20
Anticipated expiration: 2030-11-09

Abstract

The utility model provides an oil and gas separator and engine, wherein, oil and gas separator includes: the cavity casing, set up inlet channel and the air outlet channel of cavity casing one end, set up the oil return passageway and the setting of the cavity casing other end are in filter element layer between air outlet channel and the oil return passageway, the filter element layer with the inner wall sealing connection of cavity casing, the filter element layer has the hole of dodging, inlet channel stretches into in the cavity casing, and passes the hole of dodging. The utility model discloses an oil and gas separator and engine can solve the problem that the oil return is not smooth and easy, oil-gas separation efficiency is low.

Description

Oil-gas separator and engine

Technical Field

The utility model relates to an engine field especially relates to an oil and gas separator and engine.

Background

During engine operation, high temperature and high pressure gases combusted within the cylinder may blow along the gap between the piston assembly and the cylinder wall into the engine in the crankcase. The exhaust gas of the engine which flows into the crankcase contains some water vapor and acidic substances, the water vapor can emulsify the engine oil after being condensed, and the acidic substances can deteriorate the engine oil and corrode parts when meeting. The crankcase ventilation system is arranged to discharge the waste gas, the oil-gas separation system is arranged in a channel of the crankcase ventilation system, the engine is mainly guaranteed to work under a proper crankcase pressure state, engine oil in the crankcase gas is separated, and after the oil-gas separation system is arranged, the lubricating performance of the engine oil is guaranteed, the waste gas containing acidic substances can be discharged, the purpose of cleaning is achieved, and the service life of engine parts is prolonged. The separation mode of the oil-gas separation system generally adopts an oil-gas pre-separation mode and a main separation mode, wherein the oil-gas pre-separation mode mainly adopts an oil-gas pre-separator, and the main separation mode mainly adopts an oil-gas separator.

The filter element type oil-gas separator is an oil-gas separation device with high separation efficiency and wide application, in the general filter element type oil-gas separator, gas carrying engine oil enters from an air inlet, the engine oil collected flows into an oil return cavity after being filtered by a filter element and then flows out from an oil return opening, and filtered waste gas flows out from an air outlet.

However, such an oil-gas separator needs a sufficient oil return height to return oil against the crankcase pressure in order to ensure smooth oil return of the separated oil, and is therefore generally installed at a higher position of the engine. If the engine is not provided with enough arrangement height or the crankcase is over-pressurized due to large air leakage, filter element blockage and the like, the problems of unsmooth oil return of the oil-gas separator and oil dripping of an air outlet pipe of the oil-gas separator exist.

SUMMERY OF THE UTILITY MODEL

The utility model provides an oil and gas separator and engine for solve the problem that the oil return is smooth and easy, oil-gas separation efficiency is low at least.

An embodiment of the utility model provides an aspect provides an oil and gas separator, include: the hollow shell body, the air inlet channel and the air outlet channel which are arranged at one end of the hollow shell body, the oil return channel which is arranged at the other end of the hollow shell body and the filter element layer which is arranged between the air outlet channel and the oil return channel are arranged.

The filter element layer with the inner wall sealing connection of cavity casing, the filter element layer has dodges the hole, inlet channel stretches into in the cavity casing, and passes dodge the hole.

The utility model discloses an inlet channel wears filter core layer and oil return passage intercommunication, and in the gaseous machine oil granule that carries got into the cavity casing from inlet channel, the machine oil granule in the gas was followed the oil return passage oil return by self action of gravity, and at this moment, gaseous not filtering through the filter core, filter core pressure need not be overcome to the oil return, and the oil return is smooth and easy, and the oil return is efficient. Meanwhile, a filter element layer is arranged between the air outlet channel and the oil return channel for separating, even if a small amount of oil drops are carried by gas, the oil drops can be settled after being filtered by the filter element layer, and oil is returned from the oil return channel.

The oil separator as described above, in one possible embodiment, the hollow housing includes: a first housing and a second housing.

The inlet channel with outlet channel is located first casing, the second casing encloses to close and forms the one end open-ended chamber that holds, first casing with the open end of second casing is connected, the filter core level in hold the chamber, the oil return passageway with hold the bottom intercommunication in chamber.

Like this, first casing can dismantle with the second casing and be connected, the installation and the change of the filter element layer of being convenient for, clearance and washing in the cavity casing of also being convenient for, oil return passage is located the bottom that holds the chamber, the collection and the oil return of the machine oil granule of being convenient for.

The oil separator as described above, in one possible embodiment, the accommodating chamber includes: a separation chamber and an oil return chamber.

The filter element layer is connected with the inner wall of the separation cavity in a sealing mode, the oil return cavity is located below the separation cavity, and the oil return channel is communicated with the oil return cavity.

Therefore, the oil return cavity is arranged to collect and store engine oil particles, and when the flow of engine oil is large, a storage space can be provided for engine oil which cannot return from the oil return channel.

In a possible embodiment, the bottom surface of the oil return cavity is an inclined surface, and the oil return channel is located at the bottom end of the inclined surface.

Therefore, the bottom surface of the oil return cavity is set to be the inclined surface, the collected engine oil can return from the oil return channel more easily, the accumulation of the engine oil in the oil return cavity is prevented, and the oil return efficiency is improved.

In a possible embodiment, the air inlet channel is located in the separation cavity, and the air inlet channel is higher than the oil return cavity.

So, when the engine oil flow is big, the engine oil of collecting in the oil return intracavity can not spill over inlet channel's lower extreme, leads to the inlet channel shutoff, can further improve oil-gas separation efficiency.

As mentioned above, in one possible embodiment, the filter element layer includes: the filter element comprises a filter element body and at least one layer of filter plate with through holes.

The filter element comprises a filter element body, at least one filter plate and an oil return channel, wherein the filter element body is arranged on one side of the filter element body, which faces the air outlet channel, or the filter plate is arranged on one side of the filter element body, which faces the oil return channel.

Like this, the filter core body can carry out primary filter to the gas that carries the machine oil granule, and the filter can carry out secondary filter to the gas that carries the machine oil granule, improves oil-gas separation efficiency.

In one possible embodiment, the filter plates are two layers, and the two layers of filter plates are respectively arranged on one side of the filter element body facing the air outlet channel and one side of the filter element body facing the oil return channel.

So, on the one hand, the filter can carry out a lot of to the gas that carries the machine oil granule and filter, improves oil-gas separation efficiency, and on the other hand, the filter that sets up in filter core body both sides can also play the fixed action to the filter core body, guarantees the assembly stability of filter core layer.

The oil separator as described above, in one possible embodiment, further includes: an installation part.

The installation part is connected with the outer side wall of the hollow shell, and the installation part is used for installing the oil-gas separator in a channel of a crankcase ventilation system.

In one possible embodiment, the filter element body is a metal filter element or a coalescent filter element wound by glass fiber filter material.

Generally, metal filter core can satisfy most operating modes, in addition, the coalescence formula filter core that the filter core body can also adopt the winding of glass fiber filter material, and the coalescence formula filter core formula that the winding of glass fiber filter material is used glass ball or waste glass as raw materials and is made through processes such as high temperature melting, wire drawing, winding, weaving, has characteristics such as insulating nature is good, heat resistance is strong, mechanical strength height.

In one possible embodiment, the distance between the filter element layer and the air outlet channel is 10% -50% of the length of the hollow shell.

Like this, the filter core layer is located the upper portion of hollow shell, even engine oil flow is big, and engine oil is difficult for overflowing the filter core, can promote oil and gas separator's separation efficiency.

The embodiment of the utility model provides an oil and gas separator, through wearing filter core layer and return oil passageway intercommunication with inlet channel, need not overcome filter core pressure and just can return oil smoothly. The thickness and the density of the filter element can be adjusted to improve the separation efficiency of the oil-gas separator, and the oil return of the oil-gas separator is not influenced. Meanwhile, the embodiment of the utility model provides an oil and gas separator, the space of storing the oil return is big, and separable contains the gas that oil capacity is big, and oil-gas separation efficiency is high. In addition, the air outlet channel and the oil return channel are positioned on different sides of the filter core layer, so that the condition that high-flow-rate gas carrying settled engine oil escapes from the air outlet channel can be prevented.

The embodiment of the utility model provides an on the other hand provides an engine, include: oil-gas separation system and oil-gas separator as above, wherein the oil-gas separator is assembled in the oil-gas separation system

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural diagram of an oil-gas separator provided in an embodiment of the present invention;

fig. 2 is a schematic sectional structure view of an oil-gas separator provided by an embodiment of the present invention.

Description of reference numerals:

100-oil-gas separator;

110-a hollow shell;

111-a first housing;

112-a second housing;

120-an intake passage;

130-an air outlet channel;

140-an oil return passage;

150-a filter element layer;

151-avoiding holes;

152-a cartridge body;

153-a filter plate;

160-a containment chamber;

161-a separation chamber;

162-oil return chamber;

170-mounting part.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

When the engine operates normally, a part of unburned combustible mixed gas and combustion waste gas in the cylinder enters a crankcase through a piston ring end gap, a piston ring, a cylinder gap and a piston ring and ring groove gap, or a valve and valve guide pipe gap, or a supercharger bearing gap to cause blow-by. The blow-by gas is composed of unburned fuel gas, water vapor, exhaust gas and the like, which can dilute the engine oil, reduce the service performance of the engine oil and accelerate the oxidation and deterioration of the engine oil. The water vapor condenses in the engine oil, which can form an oil blockage and block the oil path. Acid gases in the exhaust gas are mixed into the lubrication system, which can lead to corrosion and accelerated wear of engine parts. Blow-by also causes the crankcase pressure to be too high and the crankcase seal to be broken, allowing oil to leak and run off.

Crankcase ventilation must be implemented to prevent excessive crankcase pressure, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage. In addition, crankcase ventilation system designs must also be implemented during engine design to meet increasingly stringent emissions requirements and to improve economy. The oil-gas separation system is arranged in a channel of a crankcase ventilation system, and mainly ensures that an engine works under a proper crankcase pressure state, engine oil in crankcase gas is separated, after the oil-gas separator is arranged, the lubricating performance of the engine oil is ensured, waste gas containing acidic substances can be discharged, the purpose of cleaning is achieved, and the service life of engine parts is prolonged. The separation mode of the oil-gas separation system usually adopts an oil-gas pre-separation mode and a main separation mode, wherein the oil-gas pre-separation mode mainly adopts an oil-gas pre-separator, and the oil-gas main separation mode adopts an oil-gas separator.

In the oil-gas separator in the prior art, gas carrying engine oil enters from the gas inlet, and enters the gas outlet and the oil return cavity after being filtered by the filter element, so that the pressure loss of the filter element is required to be overcome for the separated engine oil return, if the gas leakage is high, the gas flow rate is high, the pressure loss through the filter element is large, the oil return height is not enough to overcome the pressure difference oil return, and the condition of unsmooth oil return exists. And the oil return port and the gas outlet of the oil-gas separator are in the same cavity, and when the gas flow rate is high, the engine oil which is not returned in time is easy to be carried out from the gas outlet, so that the separation efficiency of oil-gas separation is reduced. In addition, the oil-gas separator with the structure is generally small in oil return cavity, and if the oil quantity in the gas is large, the risk that engine oil submerges part of the filter element exists.

In view of this, the embodiment of the utility model provides an oil and gas separator and engine, its oil and gas separator is through wearing filter element layer and oil return channel intercommunication with inlet channel, need not overcome filter core pressure just can the oil return smoothly. The thickness and the density of the filter element can be adjusted to improve the separation efficiency of the oil-gas separator, and the oil return of the oil-gas separator is not influenced. Meanwhile, the embodiment of the utility model provides an oil and gas separator, the space of storing the oil return is big, and separable machine oil volume is big gas, and oil-gas separation efficiency is high. In addition, the air outlet channel and the oil return channel are positioned on different sides of the filter core layer, so that the condition that high-flow-rate gas carrying settled engine oil escapes from the air outlet channel can be prevented.

The invention is described below with reference to the accompanying drawings in conjunction with specific embodiments.

Example one

Fig. 1 is a schematic structural diagram of an oil-gas separator provided by an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a section of an oil-gas separator provided by an embodiment of the present invention.

Referring to fig. 1 and 2, an oil-gas separator 100 according to an embodiment of the present invention includes: the filter includes a hollow case 110, an air inlet passage 120 and an air outlet passage 130 provided at one end of the hollow case 110, an oil return passage 140 provided at the other end of the hollow case 110, and a filter element layer 150 provided between the air outlet passage 130 and the oil return passage 140.

The filter element layer 150 is hermetically connected to the inner wall of the hollow casing 110, the filter element layer 150 has an avoiding hole 151, and the air inlet passage 120 extends into the hollow casing 110 and passes through the avoiding hole 151.

Specifically, the hollow casing 110 may be a rectangular parallelepiped, a cylinder, or another body shape having a closed accommodating cavity, and the body shape of the hollow casing 110 is not limited in any way.

The embodiment of the utility model provides an oil and gas separator 100 uses hollow shell 110 to explain as the cylinder, and filter element layer 150 can be the disc type, and its circular outer edge and hollow shell 110's inner wall sealing connection, separates air outlet channel 130 and return oil channel 140 in filter element layer 150's both sides, has on filter element layer 150 with inlet channel 120's external diameter size assorted dodge hole 151, and inlet channel 120 stretches into hollow shell 110's inside and passes filter element layer 150.

At this time, the air carrying the engine oil particles enters the hollow shell 110 from the air inlet passage 120, the filter core layer 150 is not closed, the engine oil particles in the air return from the oil return passage 140 under the action of self gravity, the oil return does not need to overcome the pressure of the filter core layer 150, the oil return is smooth, and the oil return efficiency is high. And air outlet channel 130 and oil return channel 140 separate the both sides at filter element layer 150, even a small amount of oil droplet still can subside after being filtered by filter element layer 150 by gas, return oil from oil return channel 140.

In some embodiments of the present invention, the hollow housing 110 may include: a first housing 111 and a second housing 112. The air inlet channel 120 and the air outlet channel 130 are located in the first shell 111, the second shell 112 encloses to form an accommodating cavity 160 with one open end, the open ends of the first shell 111 and the second shell 112 are connected, the filter element layer 150 is located in the accommodating cavity 160, and the oil return channel 140 is communicated with the bottom of the accommodating cavity 160.

As shown in fig. 1 and 2, the first housing 111 is exemplarily a top cover, and the top cover is provided with an air inlet channel 120 and an air outlet channel 130, the air inlet channel 120 passes through the top cover, and the air outlet channel 130 does not pass through the top cover. The second housing 112 encloses to form an accommodating chamber 160 with an opening at one end, the lower part of the accommodating chamber 160 can collect and accommodate the engine oil, the oil return channel 140 is connected with the bottom of the accommodating chamber 160, and the collected engine oil returns from the oil return channel 140 smoothly.

The first housing 111 can be detachably connected to the open end of the second housing 112, and it is easy to understand that the first housing 111 can be detachably connected to the open end of the second housing 112, which facilitates the installation and replacement of the filter element layer 150, and also facilitates the cleaning and washing of the inside of the hollow housing 110.

Of course, the present invention is not limited thereto, and the first casing 111, the second casing 112 and the filter element layer 150 may also be integrally formed, and herein, the present invention is not limited thereto. Herein, "integrally formed" means that a plurality of parts are processed together to form an integral body.

In some embodiments of the present invention, the distance between the filter element layer 150 and the air outlet channel 130 is 10% -50% of the length of the hollow shell 110.

It can be understood that the filter element layer 150 is located at the middle upper portion of the hollow casing 110, that is, when the amount of the engine oil contained in the gas is large, the deposited engine oil will not easily diffuse into the filter element layer 150, and the oil-gas separation efficiency can be further improved.

In the oil separator 100 as described above, the accommodating chamber 160 may be divided into: a separation chamber 161 and an oil return chamber 162. The filter element layer 150 is arranged in the separation chamber 161 and is connected with the inner wall of the separation chamber 161 in a sealing way. The oil return cavity 162 is located below the separation cavity 161 and is used for collecting and storing engine oil particles, when the flow rate of the engine oil is large, a storage space can be provided for the engine oil which cannot come back from the oil return channel 140, the oil return cavity 162 can be sized according to actual requirements, and the large oil return cavity 162 can separate gas with large engine oil amount, so that the separation efficiency of the oil-gas separator 100 is improved.

In order to make the oil return from the oil return channel 140 smoother, as shown in fig. 1 and fig. 2, the bottom wall of the oil return cavity 162 may be an inclined surface, and the oil return channel 140 is disposed at the bottom end of the inclined surface to form a funnel shape, so that the collected oil can be returned from the oil return channel 140 more easily, and the oil is prevented from accumulating in the oil return cavity 162, thereby improving the oil return efficiency.

In some embodiments of the present invention, the air inlet passage 120 may be located in the separation chamber 161, and the air inlet passage 120 is higher than the oil return chamber 162, i.e. the air inlet passage 120 does not extend into the oil return chamber 162. It is easy to understand that when the oil flow is large, the oil collected in the oil return chamber 162 does not flow over the lowest end of the air inlet passage 120 to block the air inlet passage 120, so that the oil-gas separation efficiency can be further improved.

In some embodiments of the present disclosure, the filter element layer 150 may include: a filter body 152 and at least one filter plate 153 having through-holes. The size of the through holes of the filter plate 153 can be specifically set according to specific working conditions.

At least one layer of filter plate 153 is disposed on a side of the cartridge body 152 facing the gas outlet passage 130, or at least one layer of filter plate 153 is disposed on a side of the cartridge body 152 facing the oil return passage 140. It is easy to understand that, the filter element body 152 can carry out primary filtration to the gas that carries the engine oil granule, and the filter 153 can carry out secondary filtration to the gas that carries the engine oil granule, improves oil-gas separation efficiency.

Wherein, filter element body 152 can adopt metal filter element or the winding coalescence formula filter element of glass fiber filter media, and generally, metal filter element can accord with and satisfy most operating modes. In addition, the filter element body 152 can also be a coalescing filter element wrapped with fiberglass filter media.

The coalescent filter element wound by the glass fiber filter material is manufactured by taking glass balls or waste glass as raw materials through processes of high-temperature melting, wire drawing, winding, weaving and the like, and has the characteristics of good insulativity, strong heat resistance, high mechanical strength and the like. The liquid drops of oil, water and other liquid are captured by the superfine fibers in the coalescence filter element, the nanometer fibers form a tortuous channel for airflow, solid particles and liquid fog drops are forced to be captured by the superfine fibers under the action of three filtering mechanisms of inertial collision, diffusion interception and direct interception, the liquid surface tension enables the small liquid drops to be coalesced into large liquid drops, and the large liquid drops are settled into the oil return cavity 162 under the action of gravity.

The glass fiber coalescence filter core is made of high-density gradient glass fiber, and is designed into an integral monolithic structure for reducing damage and leakage, and the surface of the filter core is subjected to hydrophobic and oleophobic treatment, so that various precision grade requirements can be met, and the oil-gas separation efficiency is further improved.

Of course, the filter element body 152 can be specifically configured according to specific working conditions, and the material used for the filter element body 152 is not limited herein.

As described above, in the oil-gas separator 100, the filter plates 153 may be two layers, and the two layers of filter plates 153 are respectively disposed on the side of the cartridge body 152 facing the gas outlet passage 130 and the side of the cartridge body 152 facing the oil return passage 140.

On the one hand, the filter 153 can carry out a lot of to the gas that carries the machine oil granule and filter, improves oil-gas separation efficiency, and on the other hand, the filter 153 of setting in filter core body 152 both sides can also play the fixed action to filter core body 152, guarantees filter core layer 150's assembly stability.

Of course, the filter plate 153 may have a plurality of layers, and the number of layers of the filter plate 153 is not limited.

With continued reference to fig. 1 and 2, in some embodiments of the present invention, the oil-gas separator 100 may further include a mounting portion 170.

A mounting portion 170 may be coupled to an outer sidewall of the hollow housing 110, and the mounting portion 170 is used to mount the gas-oil separator 100 in a passage of a crankcase ventilation system.

Example two

The embodiment of the utility model provides an engine, include: an oil-gas separation system and an oil-gas separator 100 as described in the first embodiment, wherein the oil-gas separator 100 is assembled in the oil-gas separation system.

The technical features of the oil-gas separator 100 are the same as those of the first embodiment, and are not described in detail herein.

The embodiment of the utility model provides an engine, including oil and gas separator, its oil and gas separator just can return oil smoothly through wearing filter element layer and return oil passageway intercommunication with inlet channel, need not overcome filter core pressure. The thickness and the density of the filter element can be adjusted to improve the separation efficiency of the oil-gas separator, and the oil return of the oil-gas separator is not influenced. Meanwhile, the embodiment of the utility model provides an oil and gas separator, the space of storing the oil return is big, and separable contains the gas that oil capacity is big, and oil-gas separation efficiency is high. In addition, the air outlet channel and the oil return channel are positioned on different sides of the filter core layer, so that the condition that high-flow-rate gas carrying settled engine oil escapes from the air outlet channel can be prevented.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, may be used in either the internal or the external relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An oil and gas separator, comprising: the filter comprises a hollow shell, an air inlet channel and an air outlet channel which are arranged at one end of the hollow shell, an oil return channel which is arranged at the other end of the hollow shell, and a filter element layer which is arranged between the air outlet channel and the oil return channel;

2. An oil separator as in claim 1 wherein the hollow housing comprises: a first housing and a second housing;

3. An oil separator as in claim 2, wherein the receiving chamber comprises: a separation chamber and an oil return chamber;

4. An oil separator as claimed in claim 3, wherein a bottom surface of the oil return chamber is inclined, and the oil return passage is located at a bottom end of the inclined surface.

5. An oil separator as in claim 3 wherein the gas inlet passage is located within the separation chamber, the gas inlet passage being higher than the oil return chamber.

6. An oil separator as in any one of claims 1-5, wherein the filter layer comprises: the filter element comprises a filter element body and at least one layer of filter plate with through holes;

7. An oil-gas separator as in claim 6, wherein the filter plate is formed in two layers, and the two layers of filter plates are respectively disposed on a side of the filter element body facing the gas outlet passage and a side of the filter element body facing the oil return passage.

8. An oil separator as in any one of claims 1-5 further comprising: an installation part;

the installation part is connected with the outer side wall of the hollow shell.

9. An oil-gas separator as in any one of claims 1-5 wherein the distance of the filter element layer from the gas outlet channel is 10% -50% of the length of the hollow housing.

10. An engine, comprising: an oil and gas separation system and an oil and gas separator as claimed in any one of claims 1 to 9;

the oil-gas separator is assembled in the oil-gas separation system.