CN209925052U - Filter screen oil drive type self-adaptive pressure-regulating engine oil-gas separation device - Google Patents

Abstract

The utility model provides a filter screen oil drive formula self-adaptation pressure regulating engine oil-gas separation device, including setting up the preseparation device in the cylinder head cover, inlet port and exhaust hole have been seted up to the preseparation device, cylinder head cover and preseparation device combination form the oil gas passageway, the preseparation device includes: the fine separation device is positioned behind the coarse separation device, and the exhaust hole is arranged behind the fine separation device; the oil-gas separation device of the filter screen oil-drive type self-adaptive pressure-regulating engine can accelerate an oil-gas mixture for the second time, separate large oil drops and small oil drops respectively and flow out through the oil return cavity, and is high in separation efficiency; in addition, the oil-gas separation device of the filter screen oil-driven self-adaptive pressure-regulating engine achieves the effect of self-adaptively regulating the internal pressure of the pre-separation device by arranging the one-way valve.

Description

Filter screen oil drive type self-adaptive pressure-regulating engine oil-gas separation device

Technical Field

The utility model belongs to the technical field of the oil-gas separation, concretely relates to filter screen oil drives formula self-adaptation pressure regulating engine oil-gas separation device.

Background

High-temperature fuel gas generated by the engine during operation can enter the crankcase through a gap between the piston group and the cylinder, so that blow-by gas is generated. The blowby gas is composed of unburned fuel gas, water vapor, exhaust gas, and the like. The water vapor is condensed in the engine oil to dilute the engine oil, so that the service performance of the engine oil is reduced; sulfur dioxide in the waste gas is oxidized in the air to generate sulfuric acid, so that the oxidative deterioration of engine oil is accelerated, and the corrosion and accelerated wear of engine parts can be caused; the blow-by gas also causes the pressure of the crankcase to be too high to damage the sealing of the crankcase, so that the engine oil leaks and runs off; the aging of the engine oil is accelerated, and the reliability is reduced. Therefore, it is desirable to control blow-by gas using a crankcase ventilation system. Blow-by gas can carry a large amount of oil gas when flowing through crankcase ventilation system, causes the engine oil loss, worsens the emission simultaneously, consequently must separate the oil gas, reduces the engine oil loss. The oil gas that removes to the engine is separated through integrated oil and gas separator in the cylinder head cover, and traditional cylinder head cover can only carry out single separation, and the effect can not reach the expectation.

Chinese utility model patent as publication No. CN205559013U "a cylinder head cover", including the cylinder head cover body, cylinder head cover body inboard is formed with oil gas preseparation cavity, and this oil gas preseparation cavity is equipped with preseparation air inlet and preseparation gas outlet in advance, follows in the oil gas preseparation cavity the preseparation air inlet arrives the preseparation gas outlet is equipped with in proper order along vertical direction interval arrangement's a plurality of transverse partition plate and is labyrinth interval arrangement's a plurality of longitudinal baffle along the horizontal direction, forms the labyrinth oil gas passageway of intercommunication preseparation air inlet and preseparation gas outlet between transverse partition plate and the longitudinal baffle to it has oil and gas separator to integrate at the cylinder head cover lateral wall. Through the above contents, the core of the cylinder head cover oil-gas pre-separation in the prior art is the labyrinth oil-gas channel formed between the transverse partition plate and the longitudinal partition plate, but the oil-gas separation capability of the single-layer structure is poor, fine oil drops cannot be separated, the combination of passive separation and active separation cannot be realized, and the requirement of national emission of an engine cannot be met.

For example, the active oil-gas separator of chinese invention patent publication No. CN104265402B, driven by high-pressure lubricating oil, is an oil-driven active separator, which can actively separate oil-gas mixture in a crankcase, but only using an active separator cannot meet the national emission standard, and cannot treat super-large oil droplets, large oil droplets and fine oil droplets in a graded manner.

For example, the chinese patent application with publication number CN108049937A, the cylinder head cover built-in oil-gas separation system, built-in oil-gas separator, includes: the labyrinth cavity comprises a cover body, a labyrinth cavity body and a bottom cover, wherein the labyrinth cavity body and the bottom cover are arranged on one side of the cover body; a rough filtering pore plate, a circuitous rectifying structure, a fine filtering pore plate and a position separating plate are arranged in the labyrinth cavity. Through the above contents, it can be found that in the prior art, the cylinder head cover oil-gas pre-separation device is provided with a rough filtering orifice plate and a circuitous rectifying structure, and can be used for oil-gas separation, but super-large oil drops (oil drops with a diameter larger than 10um) and large oil drops (oil drops with a diameter of 2-10 um) are easily mixed, and oil drop adsorption and flow guide effects are not provided, so that the diameter of oil drops entering the fine filtering orifice plate is still very large, and the device has a very large influence on treatment of small oil drops (oil drops with a diameter of 0.1-2 um); the circuitous rectifying structure disclosed by the prior art cannot solve the problem of secondary crushing (collision splashing) of oil drops generated by high-speed collision of an oil-gas mixture, the oil drops cannot be adsorbed and recovered after flowing through the circuitous rectifying structure, and the oil drops still flow to an outlet along with the oil-gas mixture, so that the separation efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a novel baffle gas-driven engine oil-gas separation device, which can separate ultra-large oil drops, large oil drops and fine oil drops in a grading way, has high separation efficiency, can solve the problems of oil drop adsorption recovery and collision splashing, does not need to regularly maintain and replace a filter element, and can simultaneously realize passive and active separation; in addition, the flow rate can be controlled in a self-adaptive mode according to the internal pressure of the separation device, the separation efficiency is improved, and the requirements of the national six-engine can be met.

The utility model aims at realizing through the following technical scheme:

the utility model provides a filter screen oil drive formula self-adaptation pressure regulating engine oil-gas separation device, include: the oil-gas separator is arranged outside the cylinder head cover; the pre-separation device is provided with an air inlet hole for receiving an oil-gas mixture in the crankcase and an exhaust hole for discharging separated waste gas, the exhaust hole is provided with an air outlet pipe connected with the oil-drive oil-gas separator, and the cylinder head cover and the pre-separation device are combined to form an oil-gas channel; the pre-separation device comprises: the filter screen plate is arranged on the bottom plate, the air inlet holes are arranged on the filter screen plate, the oil-gas mixture in the crank case flows in from the air inlet holes on the filter screen plate, and due to the action of the filter screen plate, when the oil-gas mixture enters air, part of large oil drops collide with the filter screen plate and flow back; the coarse separation device is arranged behind the filter screen plate and is used for performing accelerated collision on the oil-gas mixture to further separate large oil drops; the fine separation device is positioned behind the coarse separation device and is used for accelerating the oil-gas mixture again to collide so as to further separate oil drops, the exhaust hole is arranged behind the fine separation device, and the exhaust hole conveys the separated waste gas to the oil-drive oil-gas separator through the exhaust pipe; due to the arrangement of the one-way valve, the one-way valve is not conducted when the internal air pressure is small, and the one-way valve is conducted when the internal air pressure is too large to relieve the internal air pressure to guarantee the separation effect, so that the pre-separation device has the characteristic of self-adaptive pressure regulation.

And a first filter hole plate in the coarse separation device is provided with a coarse filter hole for accelerating the oil-gas mixture. In one embodiment, the first filtering baffle is provided with a filtering rib for guiding oil to the first oil return cavity; in still another embodiment, be provided with the needle-like bellying that is used for increasing oil gas collision area of contact on the baffle is strained to the first, needle-like bellying can prevent effectively that oil drips from causing the secondary fragmentation because of high-speed collision, improves oil-gas separation efficiency. The first oil return cavity is arranged below the first filter baffle plate, the first filter baffle plate is of a non-closed opening structure so that an oil-gas mixture can flow conveniently, and the first oil return pipe is arranged at the bottom of the first oil return cavity.

In one embodiment, the second filter plate, the filter element and the second filter baffle plate of the fine separation device are arranged against each other on the bottom plate; the second filter hole plate is provided with fine filter holes for carrying out secondary acceleration on the oil-gas mixture; the outlet end of the one-way valve is fixed on the second filter hole plate, and the fine filter holes are formed in the second filter hole plate, so that the outlet end of the one-way valve covers part of the fine filter holes, when the internal pressure of the preseparation device is low, the air pressure is insufficient to impact and open the one-way valve, the oil-gas mixture can be accelerated through the fine filter holes which are not covered by the one-way valve, when the internal pressure of the preseparation device is high to a certain degree, the air pressure is sufficient to impact and open the one-way valve, and part of the oil-gas mixture can flow through the fine filter holes which are covered by the one-way valve; the second is strained and is provided with on the baffle and is used for collision separation oil droplet and water conservancy diversion oil droplet to the second and strain the rib to return oil chamber's two, baffle rear is strained at the second to the second oil chamber setting, the baffle is strained to the second and is non-confined open structure, the second returns oil pipe setting and returns oil chamber's bottom at the second.

In one embodiment, umbrella-shaped oil return valves for preventing exhaust gas from backflushing to enter the preseparation device are further arranged on the first oil return pipe and the second oil return pipe, so that the influence on oil-gas preseparation efficiency caused by the exhaust gas backflushing can be effectively prevented.

In one embodiment, the material of the filter element is any one of non-woven fabric, felt, glass fiber and synthetic fiber.

In an embodiment, the interval of first filtration pore board and first filtration baffle is 2 ~ 5mm, according to the air input size of inlet port, the aperture of coarse filtration pore can set up to 3 ~ 6mm, the number of coarse filtration pore sets up to 10 ~ 45, makes the velocity of flow control through first filtration pore board at 5 ~ 8m/s, and the first filtration pore board oil-gas mixture of flowing through is effectual with first filtration baffle striking separation oil drop at this velocity of flow within range.

In one embodiment, according to the size of the air inflow of the air inlet hole, the aperture of the fine filtering holes can be set to be 2-3 mm, the number of the fine filtering holes is set to be 10-54, the flow speed passing through the second filtering hole plate is controlled to be 15-30 m/s, and the effect of separating oil drops by the collision of the oil-gas mixture flowing through the second filtering hole plate and the second filtering baffle in the flow speed range is good.

Compared with the prior art, the utility model has the advantages of:

the oil-gas separation device of the filter screen oil-driven self-adaptive pressure-regulating engine can block partial large oil drops from being sucked in an air inlet stage, can accelerate an oil-gas mixture twice, separates the large oil drops and the small oil drops respectively and flows out through the oil return cavity, and is high in separation efficiency; on the adsorption of the oil drops, the filter element is not blocked by residues due to the impact force of secondary acceleration, so that the filter element does not need to be replaced periodically, and the problem of periodic replacement and maintenance can be solved; the oil-gas separation device of the filter screen oil-driven self-adaptive pressure-adaptive engine can also preset the specifications (including the aperture size and the number of filter holes) of the coarse filter holes and the fine filter holes according to the size of the air inflow, so that the flow velocity after primary acceleration and secondary acceleration is ensured, and the efficiency of separating oil drops by impact is improved; in addition, the oil-gas separation device of the filter screen type self-adaptive pressure regulating engine achieves the effect of self-adaptively regulating the internal pressure of the pre-separation device by arranging the one-way valve, and realizes the new effect of self-adaptive pressure regulation by combining the one-way valve with the second filter hole plate; the oil-gas separation device of the filter screen oil-driven self-adaptive pressure-regulating engine can also combine passive separation with active separation to realize the sufficient separation of oil drops and waste gas.

Drawings

Embodiments of the invention are further described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the internal structure of a cylinder head cover according to an embodiment of the present invention;

FIG. 2 is a schematic three-dimensional structure of a preseparation device according to an embodiment of the present invention;

FIG. 3 is a schematic plan view of a preseparation apparatus according to an embodiment of the present invention;

fig. 4 is a schematic view of a structure of a screen plate according to an embodiment of the present invention;

fig. 5 is a schematic three-dimensional structure of a first filter aperture plate and a first filter baffle according to an embodiment of the present invention;

fig. 6 is a schematic three-dimensional view of a first filter baffle having needle-like protrusions according to an embodiment of the present invention;

fig. 7 is a schematic three-dimensional view of a second filter plate, a filter element and a second filter baffle according to an embodiment of the present invention;

FIG. 8 is a schematic view of the outlet end of the check valve covering the fine filter aperture according to one embodiment of the present invention;

fig. 9 is a schematic structural view of an outlet pipe of a cylinder head cover according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an oil-driven oil-gas separator according to an embodiment of the present invention;

fig. 11 is a schematic diagram of the operation of the check valve in the on state according to an embodiment of the present invention.

In the drawing, 100 is a cylinder head cover, 200 is a preseparation device, 201 is a bottom plate, 202 is a filter screen plate, 203 is a first filter hole plate, 204 is a first filter baffle plate, 205 is a second filter hole plate, 206 is a filter core, 207 is a second filter baffle plate, 208 is a first oil return cavity, 209 is a first oil return pipe, 210 is a second oil return cavity, 211 is a second oil return pipe, 212 is an air inlet hole, 213 is an air outlet hole, 214 is a one-way valve, 215 is a coarse filter hole, 216 is a filter rib, 217 is a fine filter hole, 218 is a second filter rib, 219 is an air outlet pipe, 220 is a needle-shaped protrusion, 400 is an oil-driven oil-gas separator, 401 is an exhaust gas inlet, 402 is an oil inlet, 403 is a mixed gas outlet, and 404 is an oil return port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment of the utility model provides a filter screen oil-drive type self-adaptive pressure-regulating engine oil-gas separation device, which comprises a pre-separation device arranged in a cylinder head cover and an oil-drive oil-gas separator arranged outside the cylinder head cover; the pre-separation device is provided with an air inlet and an air outlet, can separate partial oil drops in the air inlet stage of the oil-gas mixture, then carries out two times of accelerated collision separation in the pre-separation device, and discharges the oil drops through an oil return pipe; the oil-drive oil-gas separator is used for further oil-gas separation, and the separation efficiency is improved. Fig. 1 is a fixed mounting position of a cylinder head cover for providing a preseparation device according to an embodiment of the present invention, as shown in fig. 1, 2 and 3, the cylinder head cover 100 is provided with a preseparation device 200, and the preseparation device 200 includes:

the filter screen plate 202 is arranged on the bottom plate 201, the air inlet holes 212 are arranged on the filter screen plate 202 (shown in fig. 3 and 4) and used for sucking an oil-gas mixture in a crank case of an engine, when the oil-gas mixture enters the preseparation device 200, due to the action of the filter screen plate 202, a part of large oil drops (oil drops with the diameter larger than 10um) can collide with the filter screen plate 202 and flow back, and the rest of the oil-gas mixture can enter the preseparation device 200 through the air inlet holes 212;

the oil-gas separation device comprises a first filter orifice plate 203 and a first filter baffle plate 204 which are arranged on a bottom plate 201 in parallel, a first oil return cavity 208 on the bottom plate 201 and a first oil return pipe 209 below the first oil return cavity, and the coarse separation device is positioned behind a filter screen plate 202 and is used for treating large oil drops (the diameter of the oil drops is 2-10 um) in an oil-gas mixture; the oil-gas separation device comprises a second filter pore plate 205, a filter element 206, a second filter baffle 207, a second oil return cavity 210 on the bottom plate 201, a second oil return pipe 211 below the second oil return cavity, and a one-way valve 214 arranged on the second filter pore plate 205, which are arranged on the bottom plate 201 in parallel, wherein the fine separation device is positioned behind the coarse separation device and is used for treating small oil drops (the diameter of the oil drops is 0.1-2 um) in an oil-gas mixture; the exhaust hole 213 is arranged behind the fine separation device and used for discharging waste gas after oil drops are separated, and the air inlet hole 212, the fine separation device, the coarse separation device and the exhaust hole 213 form an oil-gas channel; the exhaust hole 213 is further provided with an outlet pipe 219 (as shown in fig. 9) for discharging an oil-gas mixture, the outlet pipe 219 is connected with the exhaust hole 213 (not shown in the figure) and passes through the cylinder head cover 100, the outlet pipe 219 is provided with an exhaust gas inlet 401 for guiding the oil-gas mixture after pre-separation into the oil-drive oil-gas separator 400, the oil-drive oil-gas separator 400 adopts the conventional equipment, as shown in fig. 10, the oil-drive oil-gas separator 400 is further provided with an oil inlet 402, a mixed gas outlet 403 and an oil return 404; the oil inlet 402 is used for injecting high-pressure engine oil into a main oil gallery of the engine to push a rotor of the oil-driven oil-gas separator 400 to rotate at a high speed so as to generate a centrifugal force of 2500G, oil drops are further separated from the oil-gas mixture entering from the waste gas inlet 401 under the action of a huge centrifugal force, the separated oil drops flow back to an oil pan of the engine through the oil return port 404, the separated waste gas is introduced into an air inlet pipe of the engine through the mixed gas outlet 403 to enter a combustion chamber for combustion, and finally passive and active separation of the oil-gas mixture in the crankcase is achieved, so that the separation effect reaches the emission standard of the national.

As shown in fig. 5, the first filter orifice plate 203 and the first filter baffle plate 204 in the coarse separation device are arranged on the bottom plate 201 in parallel (refer to fig. 3); the first filter hole plate 203 is provided with a coarse filter hole 215 for performing primary acceleration on the oil-gas mixture. In one embodiment, the first filter baffle 204 is provided with a filter rib 216 for separating large oil drops (with an oil drop diameter of 2-10 um) by collision and guiding the large oil drops to the first oil return cavity 208, the first oil return cavity 208 is arranged below the first filter baffle 204, the first filter baffle 204 is of an unsealed opening structure (so as to form an oil-gas channel), and the first oil return pipe 209 is arranged at the bottom of the first oil return cavity 208; the oil-gas mixture is accelerated by the first filter orifice plate 203 and then collides with the first filter baffle plate 204, large oil drops flow into the first oil return cavity 208 through a filter rib 216, and the rest of the oil-gas mixture flows out through an opening part (oil-gas channel) of the first filter baffle plate 204; in yet another embodiment, as shown in fig. 6, a needle-shaped protrusion 220 for increasing the oil-gas collision contact area is disposed on the first filter baffle 204, the needle-shaped protrusion 220 can effectively adsorb large oil drops colliding with the first filter baffle 204 at a high speed and guide the oil drops to the first oil return cavity 208, so as to prevent the large oil drops from being broken again due to the high-speed collision (splash is easily generated by the collision of the large oil drops), thereby improving the oil-gas separation efficiency, the large oil drops flow into the first oil return cavity 208 through the needle-shaped protrusion 220, and the rest of the oil-gas mixture flows out through the opening portion (oil-gas passage) of the first filter baffle 204.

In one embodiment, if the air intake amount of the air intake hole 212 is 60L/min, the aperture of the coarse filter hole 215 is set to be 3mm, the number of the coarse filter holes 215 is set to be 27, and the distance between the first filter orifice plate 203 and the first filter baffle 204 is set to be 2mm, so that the flow rate passing through the first filter orifice plate 203 is controlled to be about 5m/s, and at this time, the oil-gas mixture flowing through the first filter orifice plate 203 has a good impact separation effect with the first filter baffle 204 under the setting of the flow rate and the distance; in another embodiment, if the air intake amount of the air intake hole 212 is 100L/min, the aperture of the coarse filter hole 215 is set to 6mm, the number of the coarse filter holes 215 is set to 10, and the distance between the first filter plate 203 and the first filter baffle 204 is set to 3mm, so that the flow rate passing through the first filter plate 203 is controlled to be about 6m/s, and at this time, the oil-gas mixture flowing through the first filter plate 203 has a good impact separation effect with the first filter baffle 204 under the setting of the flow rate and the distance; in another embodiment, if the air intake amount of the air intake hole 212 is 150L/min, the aperture of the coarse filter hole 215 is set to 5mm, the number of the coarse filter holes 215 is set to 25, and the distance between the first filter plate 203 and the first filter baffle 204 is set to 5mm, so that the flow rate passing through the first filter plate 203 is controlled to be about 5m/s, and at this time, the oil-gas mixture flowing through the first filter plate 203 has a good impact separation effect with the first filter baffle 204 under the setting of the flow rate and the distance; in another embodiment, if the air intake amount of the air intake hole 212 is 270L/min, the aperture of the coarse filter hole 215 is set to 6mm, the number of the coarse filter holes 215 is set to 20, and the distance between the first filter plate 203 and the first filter baffle 204 is set to 4mm, so that the flow rate passing through the first filter plate 203 is controlled to be about 8m/s, and at this time, the oil-gas mixture flowing through the first filter plate 203 has a good impact separation effect with the first filter baffle 204 under the setting of the flow rate and the distance; in another embodiment, if the intake air amount of the intake hole 212 is 270L/min, the aperture of the coarse filter hole 215 is set to 3mm, the number of the coarse filter holes 215 is set to 45, and the distance between the first filter plate 203 and the first filter baffle 204 is set to 4mm, so that the flow rate through the first filter plate 203 is controlled to be about 8m/s, and at this time, the oil-gas mixture flowing through the first filter plate 203 has a good impact separation effect with the first filter baffle 204 under the setting of the flow rate and the distance.

In one embodiment, as shown in fig. 3, the second filter plate 205, the filter element 206 and the second filter baffle 207 of the fine separation device are arranged on the bottom plate 201 in close proximity to each other, and the second filter plate 205 is provided with a one-way valve 214; be provided with on the second filter pore board 205 and be used for carrying out the fine filtration pore 217 of secondary acceleration to oil gas mixture, when oil gas mixture flows through second filter pore board 205, oil gas mixture has carried out the secondary acceleration under the effect of fine filtration pore 217, and oil gas mixture can be right filter core 206 carries out high-speed impact, the filter core 206 lower part is for open structure is convenient for form the oil gas passageway, filter core 206 is used for adsorbing the little oil droplet (it means oil droplet diameter is 0.1 ~ 2um) after oil gas mixture secondary acceleration, and wherein the material of filter core 206 can be non-woven fabrics, felt, glass fiber or synthetic fiber, and filter core 206 adopts these materials to adsorb oil droplet effect good, and under the high-speed impact effect of secondary acceleration, its surface can not gather the residue, therefore can avoid regularly changing the maintenance (directly adopt the filter cotton to carry out oil gas separation in the prior art, its is efficient, but the filter cotton needs to be replaced and maintained regularly, and the maintenance cost is high); as shown in fig. 7 and 8, the outlet end of the check valve 214 is fixed on the second filter hole plate 205, because the second filter hole plate 205 is provided with the fine filter holes 217, the outlet end of the check valve 214 covers a part of the fine filter holes 217, when the internal pressure of the preseparation device 200 is low, the air pressure is not enough to impact and open the check valve 214, the oil-gas mixture can be accelerated through the fine filter holes 217 which are not covered by the check valve 214, when the internal pressure of the preseparation device 200 is high to a certain extent (when the flow rate of the oil-gas mixture is greater than 18.2 m/s), the air pressure is enough to impact and open the check valve 214, and a part of the oil-gas mixture can flow through the fine filter holes 217 covered by the check valve 214, so as to; the principle of the check valve 214 is that in an initial state, the top cover of the check valve abuts against the inlet end by means of the elastic force of the spring, and only when the pressure at the inlet end is higher than a certain degree, the top cover compresses the spring to conduct the check valve (as shown in fig. 11), and at the moment, a medium can enter through the inlet end and flow out from the fine filter hole covered by the outlet end; the second filtering baffle 207 is provided with two filtering ribs 218 for separating oil droplets by collision and guiding the oil droplets to the second oil return cavity 212, the lower part of the second filtering baffle 207 is of a non-closed opening structure (forming an oil-gas channel) so as to facilitate the flow of an oil-gas mixture, the oil-gas mixture flows through the filter element 206, the oil droplets flow into the second oil return cavity through the two filtering ribs 218 under the impact action of the second filtering baffle 207, and the rest of the oil-gas mixture enters the next-stage separation device through the opening structure (the oil-gas channel) of the second filtering baffle 207; in one embodiment, if the air intake amount of the air intake hole 212 is 60L/min, the aperture of the fine filter holes 217 is set to be 2mm, and the number of the fine filter holes 217 is set to be 22 (where the outlet end of the check valve 214 is covered with 4, the outlet end of the check valve 214 is not covered with 18, and the oil-gas mixture can pass through the 18 uncovered fine filter holes 217), at this time, the air pressure inside the pre-separation device 200 is not enough to conduct the check valve 214, the flow rate through the second filter hole plate 205 is controlled to be about 18m/s, the oil-gas mixture flowing through the second filter hole plate 205 impacts the filter element 206 at this flow rate, and the oil-gas mixture after the filter element 206 adsorbs oil droplets continues to impact the second filter baffle 207 at this flow rate, so as to obtain a better oil droplet; when the air inflow of the air inlet hole 212 is increased from 60L/min to 78L/min, the air pressure in the preseparation device 200 is increased, the check valve 214 is conducted under the impact of the air pressure (the oil-gas mixture can pass through 22 fine filter holes 217), the flow rate passing through the second filter hole plate 205 is controlled to be about 18.8m/s, the oil-gas mixture passing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, the oil-gas mixture after the filter element 206 adsorbs oil drops continuously impacts the second filter baffle plate 207 at the flow rate, and a good oil drop separation effect can be obtained; in another embodiment, if the air intake amount of the air intake hole 212 is 60L/min, the aperture of the fine filter hole 217 is set to be 3mm, the number of the fine filter holes 217 is set to be 10 (wherein the outlet end of the check valve 214 is covered by 2, the outlet end of the check valve 214 is not covered by 8, and the oil-gas mixture can pass through the 8 uncovered fine filter holes 217), so that the flow rate passing through the second filter plate 205 is controlled to be about 17.7m/s, at this time, the air pressure inside the preseparation device 200 is not enough to conduct the check valve 214, the oil-gas mixture flowing through the second filter plate 205 impacts the filter element 206 at the flow rate, and the oil-gas mixture after the filter element 206 adsorbs oil droplets continuously impacts the second filter baffle 207 at the flow rate, so as to obtain a better oil droplet separation effect; when the air inflow of the air inlet hole 212 is increased from 60L/min to 80L/min, the air pressure in the preseparation device 200 is increased, the check valve 214 is conducted under the impact of the air pressure (the oil-gas mixture can pass through 10 fine filter holes 217), so that the flow rate passing through the second filter hole plate 205 is controlled to be about 18.9m/s, the oil-gas mixture passing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, the oil-gas mixture after the filter element 206 adsorbs oil drops continuously impacts the second filter baffle plate 207 at the flow rate, and a good oil drop separation effect can be obtained; in yet another embodiment, if the air intake amount of the air intake hole 212 is 120L/min, the aperture of the fine filter hole 217 is set to be 2.5mm, the number of the fine filter holes 217 is set to be 30 (wherein the outlet end of the check valve 214 is covered by 6, the outlet end of the check valve 214 is not covered by 24, and the oil-gas mixture can pass through the 24 uncovered fine filter holes 217), so that the flow rate passing through the second filter hole plate 205 is controlled to be about 17m/s, at this time, the air pressure inside the preseparation device 200 is not enough to conduct the check valve 214, the oil-gas mixture flowing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, and the oil-gas mixture after adsorbing small oil drops continues to impact the second filter baffle plate 207 at the flow rate, so as to obtain a better small oil; when the air inflow of the air inlet hole 212 is increased to 165L/min from 120L/min, the air pressure in the preseparation device 200 is increased, the check valve 214 is conducted under the impact of the air pressure (the oil-gas mixture can pass through 30 fine filter holes 217), so that the flow rate passing through the second filter hole plate 205 is controlled to be about 18.7m/s, the oil-gas mixture passing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, the oil-gas mixture after the filter element 206 adsorbs oil drops continuously impacts the second filter baffle plate 207 at the flow rate, and a good oil drop separation effect can be obtained; in yet another embodiment, if the air intake amount of the air intake hole 212 is 200L/min, the aperture of the fine filter hole 217 is set to be 2.4mm, the number of the fine filter holes 217 is set to be 54 (where the outlet end of the check valve 214 is covered with 12, the outlet end of the check valve 214 is not covered with 42, and the oil-gas mixture can pass through the 42 uncovered fine filter holes 217), so that the flow rate passing through the second filter hole plate 205 is controlled to be about 17.5m/s, at this time, the air pressure inside the preseparation device 200 is not enough to conduct the check valve 214, the oil-gas mixture flowing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, and the oil-gas mixture after the filter element 206 adsorbs oil drops continuously impacts the second filter baffle plate 207 at the flow rate, so as to obtain a good; when the air inflow of the air inlet hole 212 is increased from 200L/min to 270L/min, the air pressure in the preseparation device 200 is increased, the check valve 214 is conducted under the impact of the air pressure (the oil-gas mixture can pass through the 54 fine filter holes 217), so that the flow rate passing through the second filter hole plate 205 is controlled to be about 18.4m/s, the oil-gas mixture passing through the second filter hole plate 205 impacts the filter element 206 at the flow rate, the oil-gas mixture after the filter element 206 adsorbs oil drops continuously impacts the second filter baffle plate 207 at the flow rate, and a good oil drop separation effect can be obtained.

In an embodiment, with continued reference to fig. 2, an umbrella-shaped oil return valve (not shown in the figure) for preventing exhaust gas from backflushing into the preseparation device 200 is further disposed on the first oil return pipe 209 and the second oil return pipe 211, so as to effectively prevent the oil-gas preseparation efficiency from being affected by the exhaust gas backflushing.

Compared with the prior art, the oil-gas separation device of the filter screen oil-driven self-adaptive pressure-regulating engine can separate partial oil drops in the air inlet stage of the oil-gas mixture, then accelerates the oil-gas mixture twice, separates large oil drops and small oil drops respectively and flows out through the oil return cavity, and has high separation efficiency; the specifications (including the aperture size and the number of filter holes) of the coarse filter holes and the fine filter holes can be preset according to the size of the air inflow, so that the flow velocity after primary acceleration and secondary acceleration is ensured, and the efficiency of separating oil drops by impact is improved; furthermore, the utility model discloses filter screen oil drive formula self-adaptation pressure engine oil-gas separation device can also make up oil drive formula oil-gas separator, realizes oil-gas mixture's active separation, further promotes oil-gas separation efficiency, finally can satisfy the standard that six discharge in state.

Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with a feature, structure, or characteristic of one or more other embodiments without limitation, as long as the combination is not logical or operational. Additionally, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.

Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.

Claims (5)

1. A filter screen oil drives formula self-adaptation pressure regulating engine oil-gas separation device includes: the oil-gas separator is arranged outside the cylinder head cover; the preseparation device has been seted up inlet port and exhaust hole, be equipped with the outlet duct of connecting oil-drive formula oil-gas separator on the exhaust hole, cylinder head cover and preseparation device combination form the oil gas passageway, its characterized in that, preseparation device includes:

the filter screen plate is arranged on the bottom plate, and the air inlet is arranged on the filter screen plate;

the coarse separation device consists of a first filter orifice plate and a first filter baffle which are arranged on the bottom plate in parallel, a first oil return cavity on the bottom plate and a first oil return pipe below the first oil return cavity, and the coarse separation device is positioned behind the filter screen plate; a first filter hole plate in the coarse separation device is provided with a coarse filter hole, a first filter baffle plate is provided with a filter rib, a first oil return cavity is arranged below the first filter baffle plate, the first filter baffle plate is of a non-closed opening structure, and a first oil return pipe is arranged at the bottom of the first oil return cavity;

the fine separation device is arranged behind the coarse separation device, and the exhaust hole is arranged behind the fine separation device;

and the first oil return pipe and the second oil return pipe are also provided with umbrella-shaped oil return valves for preventing waste gas from backflushing into the pre-separation device.

2. The strainer oil-driven adaptive boost engine oil-gas separation device of claim 1, wherein: the second filter hole plate, the filter element and the second filter baffle plate in the fine separation device are arranged on the bottom plate in a close fit manner; the second is provided with the thin filtration pore on the filtration pore board, the exit end of check valve is fixed on the second filtration pore board, be provided with two on the second strains the baffle and strain the rib, the second returns oil chamber and sets up in the second and strains the baffle rear, the baffle is strained to the second and is non-confined open structure, the second returns oil pipe and sets up in the bottom in second returns oil chamber.

3. The strainer oil-driven adaptive boost engine oil-gas separation device of claim 1, wherein: the material of filter core is any one of non-woven fabrics, felt, glass fiber or synthetic fiber.

4. The strainer oil-driven adaptive boost engine oil-gas separation device of claim 1, wherein: the interval of first filtration orifice board and first baffle of straining is 2 ~ 5mm, the aperture of thick filtration pore is 3 ~ 6mm, the number of thick filtration pore is 10 ~ 45.

5. The strainer oil-driven adaptive boost engine oil-gas separation device of claim 2, wherein: the aperture of the fine filtering holes is 2-3 mm, and the number of the fine filtering holes is 10-54.

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