CN114458417B - Oil-gas separation system of floating variable-section impeller - Google Patents

Abstract

The invention discloses an oil-gas separation system of a floating variable-section impeller. The oil separator comprises an engine, an oil pan and a centrifugal oil separator, wherein the oil pan is arranged at the bottom of a crankcase of the engine, an oil inlet of the oil separator is communicated with an oil outlet of the engine through a high-pressure oil inlet pipe, an oil outlet of the oil separator is communicated with an oil inlet of the oil pan through an oil return pipe, an air inlet of the oil separator is communicated with an air outlet of the engine through an air inlet pipe, the oil separator further comprises an oil connecting pipe, one end of the oil connecting pipe is communicated with a main oil duct of the engine, the other end of the oil connecting pipe is in sliding connection with a rotating shaft of an oil separator impeller, and blades of the oil separator impeller are variable-section blades. The variable-section impeller structure capable of floating up and down is added, so that the variable-section impeller of the oil-gas separator can float up and down according to the engine oil pressure and the rotating speed, the rotating speed control of the oil-gas separator is realized, and the service life and the separation efficiency of the oil-gas separator are improved.

Description

Oil-gas separation system of floating variable-section impeller

Technical Field

The invention belongs to the technical field of automobile engines, and particularly relates to an oil-gas separation system of a floating variable-section impeller.

Background

During operation of the engine, the high-pressure combustible mixture of the combustion chamber may leak into the crankcase more or less through the gap between the piston group and the cylinder, causing blow-by. The components of the blowby gas are unburned fuel gas, water vapor, waste gas and the like, which dilutes engine oil, reduces the service performance of the engine oil and accelerates the oxidation and deterioration of the engine oil. The water vapor is condensed in the engine oil, so that oil sludge can be formed to block an oil way; acid gases in the exhaust gas mix into the lubrication system, which can lead to corrosion and accelerated wear of engine parts; blow-by gas also can cause the crankcase pressure to be too high to break the crankcase seal, causing oil leakage. In order to prevent the crankcase from being too high in pressure, prolong the service life of engine oil, reduce the abrasion and corrosion of parts and prevent the engine from leaking oil, crankcase ventilation must be implemented. One key component of crankcase ventilation is the oil and gas separator. The oil-gas separator has the functions of separating engine oil from the combustible mixed gas, enabling the separated engine oil to return to the oil pan to perform lubricating and the like again, and enabling the combustible mixed gas to burn again to generate power.

Early oil-gas separators were labyrinth type, and later with the increased discharge, there were screens, filters, centrifugation, electric, etc. Among them, the centrifugal oil-gas separator has an advantage in that it is widely used without adding additional driving and maintenance.

The working principle of the centrifugal oil-gas separator is that a rotary vortex is formed in the separator by means of external input energy, oil-gas mixtures with different densities are distributed in a circular ring shape under the action of centrifugal force, and oil drops with high density are thrown on the inner wall of the shell and return to the oil pan through the oil drain port. And the gas with small density enters the air inlet pipeline of the diesel engine from the air outlet after being purified.

The centrifugal oil-gas separator mainly comprises a shell, a disc, a rotating shaft, an air inlet and outlet pipe and the like, the pressure of engine oil entering the oil-gas separator by the oil-gas separator system in the prior scheme is uncontrollable, and the pressure range of the engine oil entering the oil-gas separator can not be ensured because the pressure varies along with the rotation speed and the load of an engine. When the engine oil pressure is high, the impeller rotates fast; when the engine oil pressure is small, the rotating speed of the impeller is low. However, too fast a rotational speed of the impeller of the oil-gas separator can affect the service life of the oil-gas separator, and too slow a rotational speed can affect the oil-gas separation efficiency.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an oil-gas separation system of a floating variable-section impeller, so that the rotation speed of the impeller of an oil-gas separator is kept between specific rotation speed ranges, and the service life and the separation efficiency of the oil-gas separator are improved.

The technical scheme adopted by the invention is as follows: the utility model provides an oil-gas separation system of floating variable cross section impeller, includes the engine, installs in the oil pan and the centrifugal oil-gas separator of engine crankcase bottom, the oil inlet of oil-gas separator passes through the oil-in of high pressure oil feed pipe and communicates with the oil-in of engine, and the oil-out of oil-gas separator passes through the oil return pipe and communicates with the oil inlet of oil pan, and the air inlet of oil-gas separator passes through the gas outlet intercommunication of intake pipe and engine, still includes the oil connecting pipe, the one end of oil connecting pipe communicates with the main oil duct of engine, the other end and the pivot sliding connection of oil connecting pipe oil-gas separator impeller, the blade of oil-gas separator impeller is variable cross section blade.

Further, the blades of the oil-gas separator impeller are variable-section blades with the widths sequentially reduced from top to bottom.

Further, the ratio of the top width a to the bottom width b of the blades of the oil-gas separator impeller is 1 & lt a\b & lt 3.

Further, the ratio of the top width a to the bottom width b of the blades of the oil-gas separator impeller is a\b=1.5.

Further, the blade edges are rectilinear.

Further, a sealing ring is arranged between the inner wall of the other end of the engine oil connecting pipe and the outer wall of the lower end of the rotating shaft of the oil-gas separator impeller.

Further, the diameter of the oil inlet of the oil-gas separator is 6-12mm.

Further, the device also comprises a controller, wherein the air inlet pipe is provided with a heater, and the heater is connected with the controller and is used for heating the gas entering the oil-gas separator.

Further, when the controller judges that the water temperature of the engine is less than or equal to the water temperature set value, the controller controls the heater to be started; and when the controller judges that the water temperature of the engine is larger than the water temperature set value, the controller controls the heater to be turned off.

Further, a temperature sensor is arranged in the engine and is used for detecting the water temperature of the engine and sending the water temperature to the controller.

The invention adds the variable-section impeller structure capable of floating up and down and the engine oil connecting pipe, the lower end of the rotating shaft of the impeller is positioned in the engine oil connecting pipe, so that the variable-section impeller of the oil-gas separator can float up and down according to the engine oil pressure and the rotating speed, thereby realizing the rotating speed control of the oil-gas separator and improving the service life and the separation efficiency of the oil-gas separator.

Drawings

FIG. 1 is a schematic diagram of the oil-gas separation system of the present invention.

Fig. 2 is a schematic view of an impeller of the oil-gas separator of the present invention.

Fig. 3 is a schematic view of a vane of an impeller of an oil-gas separator of the present invention.

Detailed Description

The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Where the terms "comprising," "having," and "including" are used in this specification, there may be additional or alternative parts unless the use is made, the terms used may generally be in the singular but may also mean the plural.

It should be noted that although the terms "first," "second," "top," "bottom," "one side," "another side," "one end," "the other end," etc. may be used and used in this specification to describe various components, these components and portions should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with top and bottom elements, under certain circumstances, also being interchangeable or convertible with one another; the components at one end and the other end may be the same or different in performance from each other.

In addition, when constituting the components, although not explicitly described, it is understood that a certain error region is necessarily included.

In describing positional relationships, for example, when positional sequences are described as "on," "above," "below," and "next," unless words or terms such as "just" or "directly" are used, it is also possible to include cases where there is no contact or contact between them. If a first element is referred to as being "on" a second element, it does not mean that the first element must be located above the second element in the figures. The upper and lower portions of the component will change in response to changes in the angle and orientation of the view. Thus, in the drawings or in actual construction, if it is referred to that a first element is "on" a second element, it can comprise the case that the first element is "under" the second element and the case that the first element is "over" the second element. In describing the time relationship, unless "just" or "direct" is used, a case where there is no discontinuity between steps may be included in describing "after", "subsequent" and "preceding".

The features of the various embodiments of the invention may be combined or spliced with one another, either in part or in whole, and may be implemented in a variety of different configurations as will be well understood by those skilled in the art. Embodiments of the present invention may be performed independently of each other or may be performed together in an interdependent relationship.

As shown in fig. 1-3, the invention provides an oil-gas separation system of a floating variable-section impeller, which comprises an engine 1, an oil pan 9 arranged at the bottom of an engine crankcase and a centrifugal type oil-gas separator 4, wherein the oil-gas separator 4 comprises separation blades 4a and impellers 4b, an oil inlet of the oil-gas separator 4 is communicated with an oil outlet of the engine 1 through a high-pressure oil inlet pipe 6, an oil outlet of the oil-gas separator 4 is communicated with an oil inlet of the oil pan 9 through an oil return pipe 8, an air inlet of the oil-gas separator 4 is communicated with an air outlet of the engine 1 through an air inlet pipe 3, an air outlet pipe 5 is connected to the oil-gas separator 4, one end of the oil connecting pipe 7 is communicated with a main oil duct of the engine 1, the other end of the oil connecting pipe 7 is connected with a rotating shaft 10 of the impeller of the oil-gas separator 4 in a sliding manner along the axial direction of the rotating shaft, and the blades 11 of the impeller of the oil-gas separator 4 are variable-section blades with one end of which have large width and the other end of which have small width, and speed change rate control can be realized by adjusting the width ratio of the two ends of the blades 11.

In the above scheme, the blades 11 of the impeller of the oil-gas separator are variable cross-section blades with the widths being sequentially and uniformly reduced from top to bottom, the edges of the blades can be straight lines or arc lines, and the ratio of the top width a to the bottom width b of the specific blades is 1 < a\b < 3, preferably 1.5 or 2 or 2.5.

The working principle of the oil-gas separation system of the floating variable-section impeller of the invention is as follows: when the pressure of the engine oil in the high-pressure oil inlet pipe 6 is high, the pressure of the engine oil connecting pipe 7 is increased, the rotating speed of the impeller 4b is increased, the impeller 4b is pushed to float upwards, at the moment, the driven engine oil is sprayed to small-section blades of the impeller through the high-pressure engine oil pipe, and the rotating speed is not increased any more; when the engine oil pressure is low, the rotation speed is reduced, the impeller 4b is reduced under the action of gravity, and the driven engine oil can be sprayed to the large-section blades of the impeller, namely, the rotation speed control is realized by changing the contact area of the engine oil and the impeller blades 11, so that the rotation speed of the impeller can be kept at a relatively stable rotation speed.

In the above scheme, a sealing ring 12 is arranged between the inner wall of the other end of the engine oil connecting pipe 7 and the outer wall of the lower end of the rotating shaft 10 of the impeller of the oil-gas separator, and the arrangement of the sealing ring ensures that the rotating shaft of the impeller can always contact with engine oil in the engine oil connecting pipe.

In the scheme, the diameter of the oil inlet of the oil-gas separator 4 is 6-12mm, and the proper diameter of the oil inlet can ensure the efficiency of the oil-gas separator and the minimum required rotation speed of the oil-gas separator.

In the above scheme, the device further comprises a controller (not shown in the figure), the air inlet pipe 3 is provided with a heater 2, and the heater 2 is connected with the controller and is used for heating the gas entering the oil-gas separator. And a temperature sensor is arranged in the engine and is used for detecting the water temperature of the engine and sending the water temperature to the controller. When the controller judges that the water temperature of the engine is less than or equal to the water temperature set value, the controller controls the heater to be started; and when the controller judges that the water temperature of the engine is greater than the water temperature set value, the controller controls the heater to be turned off, and the water temperature set value is 4 ℃.

It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The foregoing description of the embodiments and specific examples of the present invention has been presented for purposes of illustration and description; this is not the only form of practicing or implementing the invention as embodied. The description covers the features of the embodiments and the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and sequences of steps.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. As will be apparent to those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising," as interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean "non-exclusive or".

Those of skill in the art will further appreciate that the various illustrative logical blocks (illustrative logical block), units, and steps described in connection with the embodiments of the invention may be implemented by electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components (illustrative components), elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present invention.

The various illustrative logical blocks or units described in the embodiments of the invention may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described. A general purpose processor may be a microprocessor, but in the alternative, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The foregoing description is only of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. The utility model provides an oil-gas separation system of floating variable cross section impeller, includes the engine, installs in the oil pan and the centrifugal oil-gas separator of engine crankcase bottom, oil inlet of oil-gas separator passes through the oil-out intercommunication of high-pressure oil inlet pipe and engine, and oil-out of oil-gas separator passes through the oil inlet intercommunication of oil pan of oil return pipe and oil-gas separator's air inlet through the gas inlet pipe and the gas outlet intercommunication of engine, its characterized in that: the engine oil pump is characterized by further comprising an engine oil connecting pipe, wherein one end of the engine oil connecting pipe is communicated with a main oil duct of an engine, the other end of the engine oil connecting pipe is in sliding connection with a rotating shaft of an impeller of the oil-gas separator along the axial direction of the rotating shaft, blades of the impeller of the oil-gas separator are variable-section blades, when the pressure of engine oil in a high-pressure oil inlet pipe is high, the pressure of the engine oil connecting pipe is increased, the rotating speed of the impeller is increased, the impeller is pushed to float upwards, and the driven engine oil is sprayed out of the small-section blades of the impeller through the high-pressure engine oil pipe, so that the rotating speed is not increased any more; when the pressure of the engine oil is low, the rotating speed is reduced, the impeller is reduced under the action of gravity, and the driven engine oil can be sprayed to the large-section blades of the impeller.

2. The oil and gas separation system of a floating variable section impeller of claim 1, wherein: the blades of the oil-gas separator impeller are variable cross-section blades with the widths sequentially reduced from top to bottom.

3. The oil and gas separation system of a floating variable section impeller of claim 2, wherein: the ratio of the top width a to the bottom width b of the blades of the oil-gas separator impeller is 1 & lt a\b & lt 3.

4. The oil and gas separation system of a floating variable section impeller of claim 2, wherein: the ratio of the top width a to the bottom width b of the blades of the oil-gas separator impeller is a\b=1.5.

5. The oil and gas separation system of a floating variable section impeller of claim 2, wherein: the blade edge is linear.

6. The oil and gas separation system of a floating variable section impeller of claim 1, wherein: a sealing ring is arranged between the inner wall of the other end of the engine oil connecting pipe and the outer wall of the lower end of the rotating shaft of the oil-gas separator impeller.

7. The oil and gas separation system of a floating variable section impeller of claim 1, wherein: the diameter of the oil inlet of the oil-gas separator is 6-12mm.

8. The oil and gas separation system of a floating variable section impeller of claim 1, wherein: the gas inlet pipe is provided with a heater, and the heater is connected with the controller and is used for heating gas entering the oil-gas separator.

9. The oil and gas separation system of a floating variable section impeller of claim 8, wherein: when the controller judges that the water temperature of the engine is less than or equal to the water temperature set value, the controller controls the heater to be started; and when the controller judges that the water temperature of the engine is larger than the water temperature set value, the controller controls the heater to be turned off.

10. The oil and gas separation system of a floating variable section impeller of claim 8, wherein: and a temperature sensor is arranged in the engine and is used for detecting the water temperature of the engine and sending the water temperature to the controller.

Images