CN108868962B

CN108868962B - Double-layer cyclone separator

Info

Publication number: CN108868962B
Application number: CN201810390818.7A
Authority: CN
Inventors: 汪义港; 熊树生; 罗一鸣; 徐剑锋; 岑璐斌
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2020-11-17
Anticipated expiration: 2038-04-27
Also published as: CN108868962A

Abstract

The invention relates to the field of oil and gas treatment, and particularly discloses a double-layer cyclone separator. The double-layer cyclone separator comprises an outer shell, an inner shell and a first separation cavity, wherein the outer shell is provided with an air inlet, an air outlet and an oil outlet; the inner shell is enclosed into a second separation cavity; the air inlet is respectively communicated with the first separation cavity and the second separation cavity. The double-layer cyclone separator divides the mixed gas entering the separator and respectively performs oil-gas separation, so that the oil-gas separation efficiency is improved.

Description

Double-layer cyclone separator

Technical Field

The invention relates to oil-gas treatment equipment, in particular to a double-layer cyclone separator.

Background

The dry oil pan technology is widely applied to the field of automobiles, particularly the fields of racing sports and automobile refitting, and can effectively improve the lubricating effect of an engine and the control performance of the automobile. In the dry oil pan technology, lubricating oil is stored and circulated through an external loop, a large amount of air is accompanied when the lubricating oil is extracted from the bottom of an engine, and if the lubricating oil is directly returned to the engine through an oil pump without oil-gas separation, the lubricating and heat dissipation effects of the lubricating oil are greatly reduced, so that the oil-gas separation efficiency is an important evaluation index of the performance of an engine system using the dry oil pan technology.

The cyclone separator is a common device in the field of gas-liquid separation, and after mixed gas enters the cyclone separator, the purpose of gas-liquid separation is achieved according to different centrifugal forces applied to different phase components in motion. The separation efficiency of the existing cyclone separator is usually 88% -92%, and the requirement of a dry oil pan technology on the cleanliness of lubricating oil cannot be met. Chinese patent publication No. CN 101749081a discloses a cyclone oil-gas separator for an engine, which attempts to reduce the descending speed of the mixed gas along the axial direction of the oil-gas separator in the form of a labyrinth baffle, but this way not only greatly affects the flow velocity of the gas, but also disturbs the originally smooth gas flow, which is not favorable for the smooth oil-gas separation.

Disclosure of Invention

The invention aims to provide a double-layer cyclone separator, which is used for shunting mixed gas entering the separator and respectively carrying out oil-gas separation, thereby improving the oil-gas separation efficiency.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a double-layer cyclone separator comprises an outer shell, an inner shell and a first separation cavity, wherein the outer shell is provided with an air inlet, an air outlet and an oil outlet; the inner shell is enclosed into a second separation cavity; the air inlet is respectively communicated with the first separation cavity and the second separation cavity.

The mixed gas is divided into two parts after entering from the gas inlet, one part enters the first separation cavity, and the carried lubricating oil is gathered on the inner surface of the outer shell; another part enters the second separation chamber, and the carried lubricating oil is gathered on the inner surface of the inner shell. Gas carries out oil-gas separation at first separation chamber and second separation chamber simultaneously, and efficiency is higher. In addition, after working for a period of time, the inner walls of the first separation cavity and the second separation cavity can form an oil layer, at the moment, when mixed gas enters from the air inlet at a high speed, oil drops can be formed to splash when the mixed gas strikes on the oil layer, the splashed oil drops are taken away by the mixed gas, and the oil-gas separation effect is influenced. The first separation cavity is an interlayer between the outer shell and the inner shell, liquid drops splashed from the inner surface of the outer shell impact the outer surface of the inner shell at a high probability, and then are adsorbed on the outer surface of the inner shell, so that the liquid drops are prevented from being taken away by airflow.

Preferably, the outer shell is cylindrical, the inner shell is conical, and an included angle between the inner shell and the outer shell is 55-80 degrees.

Preferably, the separator further comprises an air outlet cylinder which is communicated with the air outlet and is inserted into the second separation cavity, and air outlet holes are distributed on the air outlet cylinder. Because the oil content in the gas mixture reduces gradually in the process of rotating and descending, namely the oil content is reduced gradually from top to bottom along the axial direction, the gas outlet cylinder is inserted into the second separation cavity, the probability that the gas mixture just entering the second separation cavity from the gas inlet is directly discharged from the gas outlet before being fully separated is reduced, and the integral separation efficiency is improved.

Preferably, the air outlet holes are distributed along the axial direction of the air outlet cylinder in sequence, and the distance between every two adjacent air outlet holes is gradually increased from bottom to top. The distribution density of the gas outlet holes is inversely proportional to the oil content of the mixed gas, so that the probability of directly discharging the gas with high oil content is further reduced.

Preferably, the inner shell is provided with a plurality of oil attaching holes which are communicated with the first separation cavity and the second separation cavity. The adsorption effect of the oil attaching hole on the lubricating oil is better, so that the oil drop splashing phenomenon can be effectively relieved.

Preferably, the area of the inner shell provided with the oil attaching hole is a splash-proof area, the splash-proof area extends from the air inlet along the flowing direction of the mixed gas, and the central angle corresponding to the splash-proof area is 70-120 degrees. Because the arrangement of the oil attaching holes can generate a great speed reducing effect on the flowing of gas, the practice proves that the phenomenon of cost reduction caused by gas impact of an oil layer in the splash-proof area is the most serious, and the reasonable arrangement of the splash-proof area can effectively give consideration to the flowability of splash-proof and gas so as to obtain the optimal oil-gas separation effect.

Preferably, the bottom of the inner shell is open, an oil storage cavity communicated with the first separation cavity and the second separation cavity is formed in the outer shell, and an oil baffle plate which is coaxially distributed with the outer shell is arranged in the oil storage cavity. The lubricating oil separated from the air-fuel mixture is collected in the oil storage chamber through the wall surfaces of the outer shell and the inner shell, and the oil storage chamber plays a role of temporarily storing the lubricating oil. Because the gas mixture is the heliciform motion in first separation chamber and second separation intracavity, the spiral air current can play the disturbance effect to the lubricating oil that stores in the oil storage intracavity. During normal work, the oil baffle plate is immersed in lubricating oil, the oil baffle plate can prevent the disturbance from further transmitting downwards, and the lubricating oil at the oil outlet is ensured to be in a stable state. In addition, the dry oil pan technology is mainly applied to the field of racing cars and refitted cars, and the centrifugal force far greater than that of ordinary cars is often generated when the racing cars and the refitted cars pass through a curve. Lubricating oil in the oil storage cavity can incline to one side under the action of centrifugal force, and even the situation that the oil outlet is completely free of lubricating oil is caused, so that the oil pump cannot extract lubricating oil from the oil storage cavity, and the work of the system is influenced. And the setting of oil baffle can slow down the speed of lubricating oil to one side slope to a certain extent, and then improves lubricating system job stabilization nature.

Preferably, the upper surface of the oil baffle is connected with the gas outlet cylinder, and the upper surface of the oil baffle is gradually inclined downwards from the center to the edge. The inclined upper surface plays a role in guiding the flow of the lubricating oil, so that the formation of a flowing dead angle of the lubricating oil on the upper surface of the oil baffle plate is avoided.

Drawings

FIG. 1 is a schematic structural view of a double-layer cyclone separator of the present embodiment;

FIG. 2 is a sectional view of the double cyclone of the present embodiment;

FIG. 3 is a schematic diagram of the change process of the oil level of the double-layer cyclone separator under the action of centrifugal force.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples

As shown in fig. 1 and 2, the double-layer cyclone separator comprises an outer shell 1, wherein the outer shell 1 is cylindrical and is arranged in a vertically closed manner, an air outlet 2 is formed in the center of the top of the outer shell 1, an air inlet 3 is formed in the top of the side wall of the outer shell 1, and an oil outlet 4 is formed in the bottom of the outer shell. The air inlet direction of the air inlet 3 is tangential to the side wall of the outer shell 1.

As shown in fig. 2, the inner shell 6 is further included, the inner shell 6 is conical, and an included angle between the inner shell 6 and the outer shell 1 is 55-80 °. The inner shell 6 is coaxially arranged with the outer shell 1, and a first separation cavity 5 is formed between the inner shell and the outer shell 1; the inner shell 6 encloses a second separation cavity 7; the air inlet 3 is respectively communicated with the first separation cavity 5 and the second separation cavity 7.

The mixed gas is divided into two parts after entering from the gas inlet 3, one part enters the first separation cavity 5, and the carried lubricating oil is gathered on the inner surface of the outer shell 1; another part enters the second separation chamber 7 and the entrained lubricant collects on the inner surface of the inner casing 6. The gas is simultaneously subjected to oil-gas separation in the first separation cavity 5 and the second separation cavity 7, and the efficiency is higher. In addition, after working for a period of time, the inner walls of the first separation cavity 5 and the second separation cavity 7 can form an oil layer, at the moment, when mixed gas enters from the air inlet 3 at a high speed, oil drops can be formed to splash on the oil layer, the splashed oil drops are taken away by the mixed gas, and the oil-gas separation effect is influenced. The first separation chamber 5 is an interlayer between the outer shell 1 and the inner shell 6, and droplets splashed from the inner surface of the outer shell 1 impact the outer surface of the inner shell 6 at a high probability and are adsorbed on the outer surface of the inner shell 6, so that the droplets are prevented from being taken away by airflow.

Further, as shown in fig. 2, the gas outlet device further comprises a gas outlet cylinder 8 communicated with the gas outlet 2 and inserted into the second separation cavity 7, the gas outlet holes 81 are sequentially distributed along the axial direction of the gas outlet cylinder 8, and the distance between two adjacent gas outlet holes 81 is gradually increased from bottom to top. Because the oil content in the gas mixture reduces gradually in the process of rotating and descending, namely the oil content is reduced gradually from top to bottom along the axial direction, the gas outlet cylinder 8 is inserted into the second separation cavity 7, the probability that the gas mixture just entering the second separation cavity 7 from the gas inlet 3 is directly discharged from the gas outlet 2 before being fully separated is reduced, and the integral separation efficiency is improved. The distribution density of the gas outlet holes 81 is inversely proportional to the oil content of the gas mixture, so that the probability of directly discharging the gas with high oil content is further reduced.

Further, as shown in fig. 2, a splash-proof area 71 is disposed on the inner housing 6, the splash-proof area 71 extends from the air inlet 3 along the flowing direction of the mixture, and a central angle corresponding to the splash-proof area 71 is 70 ° to 120 °. The splash-proof area 71 is distributed with a plurality of oil attachment holes which are communicated with the first separation cavity 5 and the second separation cavity 7, and the axes of the oil attachment holes point to the axis of the outer shell 1 or incline towards the direction opposite to the air inlet direction. The adsorption effect of the oil attaching hole on the lubricating oil is better, so that the oil drop splashing phenomenon can be effectively relieved. In addition, the arrangement of the oil-attaching holes can generate a great deceleration effect on the flowing of the gas, and practice proves that the phenomenon that cost reduction of an oil layer caused by gas impact is the most serious in the splash-proof area 71, and due to the reasonable arrangement of the splash-proof area 71, splash prevention and gas mobility can be effectively considered, so that the optimal oil-gas separation effect is obtained.

Further, as shown in fig. 2 and 3, the bottom of the inner shell 6 is open, an oil storage chamber 9 is provided in the outer shell 1 and is simultaneously communicated with the first separation chamber 5 and the second separation chamber 7, and an oil baffle plate 10 is provided in the oil storage chamber 9 and is coaxially distributed with the outer shell 1. The lubricating oil separated from the air-fuel mixture is collected in the oil storage chamber 9 via the wall surfaces of the outer housing 1 and the inner housing 6, and the oil storage chamber 9 serves to temporarily store the lubricating oil.

Because the mixed gas is in spiral motion in the first separation cavity 5 and the second separation cavity 7, the spiral air flow can disturb the lubricating oil stored in the oil storage cavity 9. During normal operation, the oil baffle plate 10 is immersed in the lubricating oil, and the oil baffle plate 10 can prevent the disturbance from further transferring downwards, so as to ensure that the lubricating oil at the oil outlet 4 is in a stable state. The upper surface of the oil baffle plate 10 is connected with the air outlet cylinder 8, and the upper surface of the oil baffle plate 10 is gradually inclined downwards from the center to the edge. The inclined upper surface plays a role in guiding the lubricating oil, so that the lubricating oil is prevented from forming a flowing dead angle on the upper surface of the oil baffle plate 10.

In addition, the dry oil pan technology is mainly applied to the field of racing cars and refitted cars, and the centrifugal force far greater than that of ordinary cars is often generated when the racing cars and the refitted cars pass through a curve. The lubricating oil level 91 in the oil storage chamber 9 will incline to one side under the action of centrifugal force, and even the oil outlet hole is completely free of lubricating oil, as shown in fig. 3C, so that the oil pump cannot extract lubricating oil from the oil storage chamber 9, and the system operation is affected. And the oil deflector 10 is arranged to slow down the tilting speed of the lubricating oil surface 91 to one side to a certain extent, so that the oil surface 91 changes in the course of turning as shown in fig. 3 a-B-C. Although the oil level 91 is still changed to the state shown in fig. 3C when the automobile is in a centrifugal force for a long time in a long curve, the time of the change process is greatly prolonged, the requirement of running in most curves can be met, and the working stability of the lubricating system is greatly improved.

The double-layer cyclone separator shunts the mixed gas entering the separator, and carries out oil-gas separation respectively, thereby improving the oil-gas separation efficiency.

In conclusion, the above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a double-deck cyclone, includes shell body (1), shell body (1) on be equipped with air inlet (3), gas outlet (2) and oil-out (4), its characterized in that: the device is characterized by also comprising an inner shell (6), wherein the inner shell (6) and the outer shell (1) are coaxially arranged, and a first separation cavity (5) is formed between the inner shell (6) and the outer shell (1); the inner shell (6) is enclosed to form a second separation cavity (7); the air inlet (3) is respectively communicated with the first separation cavity (5) and the second separation cavity (7); a plurality of oil attaching holes which are communicated with the first separation cavity (5) and the second separation cavity (7) are formed in the inner shell (6); the area of the inner shell (6) provided with the oil-attached holes is a splash-proof area (71), the splash-proof area (71) extends from the air inlet (3) along the flowing direction of the mixed gas, and the central angle corresponding to the splash-proof area (71) is 70-120 degrees; the bottom opening of interior casing (6) to be equipped with in outer casing (1) simultaneously with first disengagement chamber (5) and second disengagement chamber (7) oil storage chamber (9) of intercommunication, oil storage chamber (9) in be equipped with outer casing (1) coaxial distribution's oil baffle (10).

2. The dual-deck cyclone separator of claim 1, wherein: the outer shell (1) is cylindrical, the inner shell (6) is conical, and an included angle between the inner shell (6) and the outer shell (1) is 55-80 degrees.

3. The dual-deck cyclone separator of claim 1, wherein: the separator also comprises an air outlet cylinder (8) which is communicated with the air outlet (2) and is inserted into the second separation cavity (7), and air outlet holes (81) are distributed on the air outlet cylinder (8).

4. The dual-deck cyclone separator of claim 3, wherein: the air outlet holes (81) are sequentially distributed along the axial direction of the air outlet cylinder (8), and the distance between every two adjacent air outlet holes (81) is gradually increased from bottom to top.

5. The double-deck cyclone separator according to any one of claims 1 to 4, wherein: the upper surface of the oil baffle plate (10) is connected with the air outlet cylinder (8), and the upper surface of the oil baffle plate (10) is gradually inclined downwards from the center to the edge.