CN218522707U

CN218522707U - Oil-gas separation structure with whole-course variable function of flow cross section

Info

Publication number: CN218522707U
Application number: CN202222898221.8U
Authority: CN
Inventors: 孙宏; 杜广成; 孙雨豪
Original assignee: Mengdachi Automotive Systems Anhui Co ltd
Current assignee: Mengdachi Automotive Systems Anhui Co ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-02-24
Anticipated expiration: 2032-11-01

Abstract

The embodiment of the application provides an oil-gas separation structure with a whole-course variable flow cross section function, wherein an impactor is installed in an oil-gas separation channel of a valve chamber cover, and a pressure regulating valve is arranged in an impact cavity of the impactor; a regulating cavity communicated with the air inlet end of the oil-gas separation channel and the impact cavity is formed in a valve seat of the pressure regulating valve, and the valve body is movably arranged in the regulating cavity; when the flow of oil-gas mixture is great, can lead to the valve body front and back end to produce great pressure differential, the valve body can remove under the effect of pressure differential for the pressure loss of separation structure maintains in the design range, is unlikely to produce too high pressure loss under the too high flow condition, can also avoid the rear end oil return valve to open the oil scurring that leads to, avoids the engine to appear the condition of "burning machine oil".

Description

Oil-gas separation structure with whole-course variable function of flow cross section

Technical Field

The utility model relates to a vehicle engine field, concretely relates to possess whole variable function's of circulation cross-section oil-gas separation structure.

Background

During operation of the engine, high-pressure combustible mixed gas and burned gas in the combustion chamber leak into the crankcase through a gap between the piston group and the cylinder to a greater or lesser extent, resulting in blow-by gas. 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 oil mixed with other impurities is easy to block an oil way; acid gases in the exhaust gas are mixed into the lubrication system, which can cause corrosion and accelerated wear of engine parts; blow-by can also cause the crankcase pressure to be too high and damage the crankcase seal, causing oil leakage, and therefore crankcase ventilation system designs are now being used in automotive designs to address the above-mentioned problems. The oil-gas separator is used as a key part in a crankcase ventilation system, and has the function of separating engine oil in crankcase emission from mixed gas to enable the engine oil to return to an oil pan, so that adverse effects of carbon deposition increase in a combustion chamber, unstable idling, over-standard exhaust emission and the like caused by the phenomenon of engine oil burning of a vehicle are avoided.

At present, most common crankcase ventilation systems adopt a structure that a passive oil-gas separator is arranged in a valve chamber cover, and the structure has the defect that the air blowby amount is changed along with the change of the rotating speed of an engine: according to the fluid mechanics principle, the higher the air blowby quantity is, the faster the flow speed is, the larger the pressure loss in the valve chamber cover is, and the larger the pressure difference at the inlet and outlet ends of the valve chamber cover is; according to the Pascal 'barrel cracking' experiment, the internal pressure of liquid is related to the height, so if the pressure difference is too large, the required oil return height is higher, the oil return is more easily not smooth, the engine oil is easily carried into the engine during gas flowing, the separation efficiency is influenced, on the other hand, the internal pressure of a crankcase is also influenced by the too large pressure difference, and the condition is most easily shown on a large-displacement engine.

Therefore, there is a need to develop an oil-gas separation structure with a variable flow cross-section throughout to solve the above-mentioned technical problems.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an oil-gas separation structure who possesses whole variable function of flow cross-section can make the pressure differential of valve chamber shroud access opening end be in certain settlement within range to solve because of the too big technical problem who influences oil-gas separation efficiency of pressure differential of valve chamber shroud access opening end.

The embodiment of the utility model provides a pair of possess whole variable function's of circulation cross-section oil-gas separation structure, include:

the valve chamber cover is internally provided with an oil-gas separation channel, and an oil return groove is formed at the air outlet end of the oil-gas separation channel;

the impactor is arranged in the oil-gas separation channel, and an impact cavity communicated with the oil-gas separation channel and the oil return groove in a fluid mode is formed in the impactor; and

the pressure regulating valve comprises a valve seat and a valve body; the valve seat is arranged in the impact cavity, and an adjusting cavity for accommodating the valve body is formed in the valve seat; the regulating cavity is provided with an air inlet and an air outlet, the air inlet is communicated to the air inlet end of the oil-gas separation channel, and the air outlet is communicated to the impact cavity;

the valve body is movably arranged in the adjusting cavity and can move from a first position to a second position under the action of the pressure difference between the front end and the rear end of the valve body; when the valve body is in the first position, the valve body seals the air inlet; when the valve body is located at the second position, a flow channel for oil-gas mixture to pass through is formed between the valve body and the gas inlet, the flow channel is communicated to the impact cavity through the gas outlet, and the gas outlet is provided with a filter element for oil-gas separation.

Optionally, a valve rod is connected to one side of the valve body facing the air inlet, the air inlet is formed with a guide sleeve matched with the valve rod, and the valve rod is movably installed in the guide sleeve; the valve rod is sleeved with a spring, and the spring is used for applying elastic force to the valve body to enable the valve body to move from the second position to the first position.

Optionally, a magazine is installed at an end of the valve rod away from the valve body, and two ends of the spring are respectively connected to the guide sleeve and the magazine.

Optionally, the impinger is provided with the apron, one side of apron with the impinger joint is fixed, and the opposite side of apron is provided with a plurality of location arch, the location arch with valve chamber shroud butt.

Optionally, the striker is provided with a base plate fixedly connected to the valve chamber cover.

Optionally, an air inlet communicated with the air inlet is formed in the bottom plate, a welding rib is arranged between the air inlet and the oil return groove, and the welding rib is fixedly connected with the valve chamber cover.

Optionally, material blocking edges are arranged on two sides of the welding rib.

Optionally, the bottom plate extends to the upper side of the oil return groove, and an oil return hole communicated to the oil return groove is formed in the bottom plate.

Optionally, an oil baffle plate is arranged at one end of the bottom plate close to the air outlet end of the oil-gas separation channel, and a rib plate is arranged at the other end of the bottom plate; the rib plate is fixedly connected with the valve chamber cover.

Optionally, a plurality of impact baffles are arranged between the air inlet end of the oil-gas separation channel and the impactor.

The embodiment of the utility model provides a following beneficial effect has:

an impactor is arranged in the oil-gas separation channel of the valve chamber cover, and a pressure regulating valve is arranged in an impact cavity of the impactor; a regulating cavity communicated with the air inlet end of the oil-gas separation channel and the impact cavity is formed in a valve seat of the pressure regulating valve, and the valve body is movably arranged in the regulating cavity; when the flow of oil-gas mixture is great, can lead to the valve body front and back end to produce great pressure differential, the valve body can remove under the effect of pressure differential for the pressure loss of separation structure maintains in the design range, is unlikely to produce too high pressure loss under the too high flow condition, can also avoid the rear end oil return valve to open the oil scurrying that leads to, avoids the engine condition of "burning machine oil" to appear. Simultaneously, reasonable circulation passageway has been designed in impinger and pressure regulating valve, can guide the flow direction of the gas of separation with the machine oil, avoids the machine oil of separation to be carried by gas once more and leads to separation efficiency to reduce.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a first cross-sectional view (the valve body is in the first position) of the embodiment of the present invention;

fig. 2 is a second cross-sectional view (the valve body is in the second position) of the embodiment of the present invention;

fig. 3 is a sectional view of the valve body in the embodiment of the present invention;

fig. 4 is an exploded schematic view of the striker according to the embodiment of the present invention;

fig. 5 is a schematic view of the internal structure of the striker according to the embodiment of the present invention;

fig. 6 is a schematic structural view of a base plate of an impactor in an embodiment of the invention;

the figures in the drawings represent:

1. a valve chamber cover; 2. an oil-gas separation channel; 21. impacting a baffle plate; 3. an oil return groove; 4. an impactor; 41. a through hole; 42. a cover plate; 421. positioning the projection; 43. a base plate; 431. an air intake; 432. stopping the material edge; 433. welding ribs; 434. an oil return hole; 435. an oil baffle plate; 436. a rib plate; 5. a pressure regulating valve; 51. a valve seat; 511. an air inlet; 512. an air outlet; 513. a filter element; 514. installing a bone position; 52. a valve body; 53. a flow channel; 54. a valve stem; 55. a guide sleeve; 56. a spring; 57. a magazine.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention. Furthermore, it is to be understood that the description herein of specific embodiments is for purposes of illustration and explanation only and is not intended to limit the present disclosure. In the present invention, unless otherwise specified, the terms "left", "right", "top" and "bottom" used in the present application generally refer to the orientation of the device in the actual use or operation, specifically the direction of the drawing in the drawings, and "inner" and "outer" refer to the outline of the device.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, an embodiment of the present invention provides an oil-gas separation structure with a whole-course variable flow cross-section, including a valve chamber cover 1, an oil-gas separation channel 2 formed in the valve chamber cover 1, and an air inlet end of the oil-gas separation channel 2 connected to an engine crankcase (not shown in the figure), so that an oil-gas mixture discharged from the engine crankcase can enter the oil-gas separation channel 2 for separation; and an oil return groove 3 is formed at the air outlet end of the oil-gas separation channel 2 and used for collecting the separated engine oil so as to realize the recovery and the reutilization of the engine oil. An oil return valve which is communicated with the oil return channel in a one-way mode is installed in the oil return groove 3, the oil return valve can be opened for oil discharge only by a certain pressure difference, and therefore too high pressure loss of a separation structure is required to be avoided.

Install impinger 4 between the inlet end of oil-gas separation passageway 2 and the end of giving vent to anger, be formed with the striking chamber with oil-gas separation passageway 2 and oil gallery 3 fluid intercommunication in the impinger 4, in other words, design corresponding through-hole 41 on the lateral wall of impinger 4 and regard as the flow path of gas and machine oil when oil-gas separation respectively, make oil-gas mixture can get into to separate in the impinger 4, the pure gas after the separation can get into oil-gas separation passageway 2 and by the end discharge of giving vent to anger of oil-gas separation passageway 2, the machine oil of separation then can flow into oil gallery 3 in order to retrieve and reuse.

In order to avoid the oil blow-by caused by the excessive pressure difference between the air inlet end and the air outlet end of the impact cavity, which causes the excessive height required for oil return, the present embodiment is provided with a pressure regulating valve 5 in the impact cavity, as shown in fig. 3-5. The pressure regulating valve 5 comprises a valve seat 51 and a valve body 52, the valve seat 51 being mounted in the impact chamber, the valve seat 51 forming a regulating chamber for accommodating the valve body 52. The adjusting cavity is provided with an air inlet 511 and an air outlet 512, the air inlet 511 is communicated to the air inlet end of the oil-gas separation channel 2, and the air outlet 512 is communicated to the impact cavity. The valve body 52 is movably mounted within the adjustment chamber and is movable from a first position to a second position under a pressure differential across the valve body 52.

Specifically, when the valve body 52 is in the first position (as shown in fig. 1), the valve body 52 closes the air inlet 511, so that the air-fuel mixture cannot pass through; when the valve body 52 is at the second position (as shown in fig. 2), a flow passage 53 for oil-gas mixture to pass through is formed between the valve body 52 and the gas inlet 511, the flow passage 53 is communicated to the impact chamber through a gas outlet 512, the gas outlet 512 is provided with a filter element 513, and the oil-gas mixture can enter the impact chamber after being subjected to oil-gas separation through the filter element 513. That is, when a certain pressure difference P0-P1 exists between the front end and the rear end of the valve body 52, the valve body 52 can move upwards under the action of the pressure difference, so that the air inlet 511 is communicated with the air outlet 512, and the oil-gas mixture can be subjected to oil-gas separation through the filter element 513. It can be understood that the size of the flow passage 53 (i.e. the moving distance of the valve body 52) can be adjusted along with the change of the front-rear end pressure difference P0-P1 of the valve body 52, so as to properly increase the flow cross section under the condition of high-flow mixed gas, thereby adjusting the pressure loss of the separation structure, so that the front-rear end pressure difference P0-P1 of the valve body 52 can be in a certain set range, ensure that the gas has certain kinetic energy to pass through the separation structure, and simultaneously avoid the over-high pressure loss of the oil-gas separation structure, and avoid the oil leakage caused by the over-high oil return height of the engine oil, thereby improving the oil-gas separation efficiency. In addition, in order to increase the gas flow area and avoid the pressure loss caused by the increase of the gas mixing amount due to the too small flow area, two gas outlets 512 are provided in the present embodiment. The peripheries of the two air outlets 512 are respectively provided with a plurality of mounting bone positions 514 for positioning and clamping the filter element 513. For reference, in this embodiment, the felt is used as the filter element 513, and the felt has a compact structure, small pores, and excellent filtering and oil-containing effects.

Specifically, in the present embodiment, a valve rod 54 is connected to the bottom of the valve body 52 (i.e., the side facing the air inlet 511), a guide sleeve 55 adapted to the valve rod 54 is formed at the air inlet 511, and the valve rod 54 is movably installed in the guide sleeve 55. The valve rod 54 is fitted with a spring 56, and the spring 56 can apply an elastic force to the valve body 52 to move the valve body from the second position to the first position. That is, the spring 56 is designed to have a certain pre-compression amount, when the pressure difference P0-P1 is greater than the elastic force of the spring 56, the valve body 52 can move under the action of the pressure difference, so as to realize the automatic opening of the pressure regulating valve 5, when the pressure difference P0-P1 is less than the elastic force of the spring 56, the valve body 52 can move to the first position under the action of the spring 56, so as to realize the automatic adjustment of the pressure regulating valve 5, and the design can set the range of the pressure difference P0-P1 by changing the elastic force of the spring 56.

Further, a magazine 57 is installed at the bottom end of the valve rod 54, and both ends of the spring 56 are connected to the guide sleeve 55 and the magazine 57, respectively, so that the spring 56 has a certain pre-compression amount. The spring 56 should select the material that the performance is splendid, makes spring 56 have fine ultimate temperature, anti fatigue life, rigidity and permanent deformation performance, need reasonable in design's clearance when spring 56 assembles in addition to promote spring 56's stability, spring 56 motion noise is low and can carry out the power value adjustment according to customer's demand, has good suitability. For reference, as shown in fig. 3, the valve rod 54 and the magazine 57 in the present embodiment are designed with a certain pouring angle in assembly, so that the assembly between the parts is improved; during assembly, the hanging platform on the magazine 57 is in clamping fit with the groove in the valve rod 54, the magazine 57 and the valve rod 54 adopt certain interference and wall thickness during design, and through CAE analysis and product tests, the assembly is convenient and reliable, and the falling phenomenon cannot occur under extreme working conditions. The magazine 57 adopts precision injection molding, the surface of the part is smooth and has no bad defects such as burrs and the like, and the product cleanliness is improved.

In addition, in order to ensure the sealing property when the valve body 52 is in contact with the intake port 511, the present embodiment is also provided with a rubber member at the bottom of the valve body 52. The rubber part adopts the splendid material of each item performance, satisfies the requirement of part normal work under the extreme environment, and valve body 52 adopts plastics material and with the integrative injection moulding of rubber part, precision injection moulding makes the part surface bright and clean, bad defects such as burr do not have, has promoted product cleanliness. The striker 4 and the valve seat 51 can be integrally formed by precision injection molding, and are made of high-performance plastic materials, so that the striker has the properties of flame retardance, oil resistance, thermal aging resistance, low temperature resistance, chemical corrosion resistance and the like.

Further, referring to fig. 4-6, the striker 4 is provided with a cover plate 42 at the top and a base plate 43 at the bottom, wherein the base plate 43 is fixedly connected to the valve chamber cover 1. Specifically, in this embodiment, the bottom side of the cover plate 42 is fixed to the striker 4 by means of a snap fit or the like, and the top side of the cover plate 42 is abutted to the valve chamber cover 1 by means of the four positioning protrusions 421 to support and position, thereby preventing the cover plate 42 from moving up and down due to vibration of the engine after installation.

An air inlet hole 431 communicated with the air inlet 511 is formed in the bottom plate 43 so as to allow the oil-gas mixture at the air inlet end of the air separation channel 2 to enter. Be provided with welding muscle 433 between inlet port 431 and the oil gallery 3, welding muscle 433 can enough realize that the location of impinger 4 is fixed through modes such as welding and valve chamber shroud 1 fixed connection, can prevent again that unseparated air-fuel mixture from revealing to oil gallery 3 or the flash in the oil gallery 3 reveals to inside the structure. For reference, the two sides of the welding rib 433 in this embodiment are provided with the blocking edges 432, so that the flash can be prevented from flowing into the separation channel.

Further, the bottom plate 43 extends to the upper side of the oil return groove 3, and the bottom plate 43 is provided with an oil return hole 434 communicated with the oil return groove 3, so that the separated engine oil can flow to the bottom plate 43 under the action of gravity and flow into the oil return groove 3 from the oil return hole 434. In addition, in this embodiment, an oil baffle 435 is disposed at an end of the bottom plate 43 close to the air outlet end of the oil-gas separation channel 2, and is used for blocking the separated engine oil and preventing the engine oil from being carried by air again. The other end of the bottom plate 43 is also provided with a rib plate 436, and the rib plate 436 is fixedly connected with the valve chamber cover 1, so that the positioning and fixing of the impactor 4 can be realized, unseparated oil-gas mixture can be blocked, and the unseparated oil-gas mixture is prevented from directly flowing into the air outlet end of the oil-gas separation channel 2. For reference, the rib plate 436 in the present embodiment is welded and fixed with the groove on the valve chamber cover 1 after clearance press-fitting and positioning, and this assembly manner is simple to operate and can provide precise positioning for subsequent welding.

In this embodiment, a plurality of impact baffles 21 are further disposed between the air inlet end of the oil-gas separation passage 2 and the impactor 4. Referring to the arrow direction in fig. 1, when the engine speed is low, the blow-by gas amount in the crankcase is small, the oil-gas mixture in the crankcase flows into the oil-gas separation passage 2 in the valve chamber cover 1, passes through the plurality of impact baffles 21 for oil-gas coarse separation, and then flows to the bottom of the impactor 4, because the blow-by gas amount is small at this time, the front-rear end pressure difference P0-P1 of the valve body 52 is smaller than the elastic force of the spring 56, the valve body 52 and the air inlet 511 are in a sealed contact state, and the pressure regulating valve 5 is closed; as shown in the direction of the arrow in fig. 2, when the flow rate of the blowby gas is unchanged, the pressure difference P0-P1 between the front end and the rear end of the valve body 52 is continuously increased due to the closing of the pressure regulating valve 5, when the pressure difference P0-P1 is greater than the elastic force of the spring 56, the pressure regulating valve 5 is opened to release the pressure, and the oil-gas mixture is subjected to oil-gas fine separation through the filter element 513; when the pressure difference P0-P1 at the front and rear ends of the valve body 52 is then reduced and the pressure difference P0-P1 is reduced to be smaller than the elastic force of the spring 56, the valve body 52 moves in the direction of the first position, so that the pressure regulating valve 5 is closed, and so on.

Similarly, when the engine speed increases, the blow-by amount in the crankcase increases, the pressure difference P0-P1 at the front end and the rear end of the valve body 52 increases, when the pressure difference P0-P1 is greater than the elastic force of the spring 56, the valve body 52 moves up under the action of the pressure difference, the pressure regulating valve 5 is opened, a flow passage 53 through which oil-gas mixture passes is formed between the valve body 52 and the air inlet 511, the oil-gas mixture can be finely separated through the filter element 513 at a certain flow rate, the separated gas enters the oil-gas separation channel 2 after being collided by the collision cavity and is discharged from the air outlet end of the oil-gas separation channel 2, and the separated engine oil flows into the oil return groove 3 for recovery and reuse. Conversely, when the engine speed is reduced or idling, the pressure difference P0-P1 decreases, the valve body 52 moves downward, and the pressure difference P0-P1 at the front and rear ends of the valve body 52 is balanced by decreasing the effective flow area of the flow passage 53.

The principle and the implementation of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understand the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its various embodiments.

Claims

1. The utility model provides a possess whole variable function's of flow cross section oil-gas separation structure which characterized in that includes:

the impactor is arranged in the oil-gas separation channel, and an impact cavity which is in fluid communication with the oil-gas separation channel and the oil return groove is formed in the impactor; and

the pressure regulating valve comprises a valve seat and a valve body; the valve seat is arranged in the impact cavity, and an adjusting cavity for accommodating the valve body is formed in the valve seat; the adjusting cavity is provided with an air inlet and an air outlet, the air inlet is communicated to the air inlet end of the oil-gas separation channel, and the air outlet is communicated to the impact cavity;

2. The oil-gas separation structure with the whole-course variable flow cross section function of claim 1, wherein: one side of the valve body, which faces the air inlet, is connected with a valve rod, the air inlet is provided with a guide sleeve matched with the valve rod, and the valve rod is movably arranged in the guide sleeve; the valve rod is sleeved with a spring, and the spring is used for applying elastic force to the valve body to enable the valve body to move from the second position to the first position.

3. The oil-gas separation structure with the whole-course variable flow cross section function of claim 2, wherein: and a magazine is installed at one end, far away from the valve body, of the valve rod, and two ends of the spring are respectively connected to the guide sleeve and the magazine.

4. The oil-gas separation structure with the whole-course variable flow cross section function of claim 1, wherein: the impactor is provided with the apron, one side of apron with the impactor joint is fixed, and the opposite side of apron is provided with a plurality of location arch, the location arch with valve chamber shroud butt.

5. The oil-gas separation structure with the whole-course variable flow cross section function of claim 1, wherein: the striker is provided with a base plate which is fixedly connected to the valve chamber cover.

6. The oil-gas separation structure with the whole-course variable flow cross section function of claim 5, wherein: an air inlet communicated with the air inlet is formed in the bottom plate, a welding rib is arranged between the air inlet and the oil return groove, and the welding rib is fixedly connected with the valve chamber cover.

7. The oil-gas separation structure with the whole-course variable flow cross section function of claim 6, wherein: and material blocking edges are arranged on two sides of the welding rib.

8. The oil-gas separation structure with the whole-course variable flow cross section function of claim 6, wherein: the bottom plate extends to the upper part of the oil return groove, and an oil return hole communicated to the oil return groove is formed in the bottom plate.

9. The oil-gas separation structure with the whole-course variable flow cross section function of claim 8, wherein: an oil baffle plate is arranged at one end, close to the air outlet end of the oil-gas separation channel, of the bottom plate, and a rib plate is arranged at the other end of the bottom plate; the rib plate is fixedly connected with the valve chamber cover.

10. The oil-gas separation structure with a flow cross section which is fully variable according to any one of claims 1 to 9, wherein: and a plurality of impact baffles are arranged between the air inlet end of the oil-gas separation channel and the impactor.