Labyrinthine profiled disc stack and centrifugal gas-liquid separator

Abstract

The application discloses a labyrinth-shaped special-shaped stack and a centrifugal gas-liquid separator. The labyrinth-shaped special-shaped stack comprises a plurality of special-shaped disc groups stacked, each special-shaped disc group comprising a first disc body and a second disc body, the first disc body and the second disc body being in a hollow circular truncated cone structure, and the upper and lower ends of the first disc body and the second disc body being provided with openings in communication with each other, the first disc body being used for sleevedly matched at the rear of the second disc body, a labyrinth structure for the flow of a gas-liquid mixture being formed between the first disc body and the second disc body, and corresponding flow-through portions being arranged in the upper end openings of the first disc body and the second disc body, the flow-through portion comprising a first shaft hole and a plurality of first gas passage channels distributed around the first shaft hole. The labyrinth-shaped special-shaped stack and the centrifugal gas-liquid separator are used for promoting the residence time of the gas-liquid mixture, and meanwhile, the separation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal separator, in particular to a labyrinth-shaped special-shaped disc stack and centrifugal gas-liquid separator. BACKGROUND

[0002] It is known that a mixture of fluids having different densities can be separated from each other by using a centrifugal separator. A specific use of such a centrifugal separator is for separating oil from gases discharged from a crankcase of an internal combustion engine.

[0003] The working principle of the active centrifugal gas-liquid separator is to form a rotating vortex in the separator by relying on external input energy, and the particles in the mixed gas flow are separated out under the action of centrifugal force. In the active centrifugal separator, a plurality of truncated conical discs (truncated cone structure) are installed on the rotating shaft, and a small hole is opened near the rotating shaft of the disc, which is the flow passage of the mixed gas. When the rotating shaft moves, the gas-liquid mixture will be thrown out along the separation space between the conical discs under the action of centrifugal force, achieving the purpose of gas-liquid separation. However, the side wall of the disc of the above-mentioned centrifugal gas-liquid separator is smooth, so the residence time of the gas-liquid mixture in the separation space between the discs is short, resulting in poor separation effect.

[0004] Therefore, there is an urgent need for a labyrinth-shaped special-shaped disc stack and centrifugal gas-liquid separator for promoting the residence time of the gas-liquid mixture and improving the separation effect. SUMMARY

[0005] The purpose of the present application is to provide a labyrinth-shaped special-shaped disc stack and centrifugal gas-liquid separator for promoting the residence time of the gas-liquid mixture and improving the separation effect.

[0006] The purpose of the present application is achieved by adopting the following technical solutions:

[0007] A labyrinth-shaped special-shaped disc stack comprises: a plurality of special-shaped disc groups stacked, each special-shaped disc group comprising a first disc body and a second disc body, the first disc body and the second disc body being in a hollow truncated cone structure, the upper and lower ends of the first disc body and the second disc body being provided with openings communicating with each other, the first disc body being used for sleevedly fitted behind the second disc body, and a labyrinth structure for the flow of gas-liquid mixture being formed between the first disc body and the second disc body.

[0008] Corresponding flow-through portions are arranged in the upper end openings of the first disc body and the second disc body, and the flow-through portions comprise a first shaft hole and a plurality of first gas passage channels distributed around the first shaft hole.

[0009] Preferably, the first disc body comprises an upper ring, a lower ring, a plurality of support rings and a plurality of first guide rods, the first guide rods are sequentially connected to the upper ring, the plurality of support rings and the lower ring from top to bottom and extend to the bottom end inside the lower ring, the plurality of support rings are distributed along the generatrix of the circular truncated cone at intervals, the plurality of first guide rods are distributed along the circumference of the circular truncated cone at intervals, a through groove is formed between every two adjacent support rings and every two adjacent first guide rods, the upper ring, every two adjacent first guide rods and adjacent support rings form a through groove, the lower ring, every two adjacent first guide rods and adjacent support rings form a through groove, and at least part of the through grooves are provided with throttle ribs protruding from the surface of the first disc body.

[0010] Preferably, the plurality of support rings are distributed along the generatrix of the circular truncated cone at equal intervals, and the plurality of first guide rods are distributed along the circumference of the circular truncated cone at equal intervals.

[0011] Preferably, along the extension direction of the first guide rods, a throttle rib is arranged in the third through groove after every two through grooves, the support ring adjacent to the throttle rib is provided with a convex rib connected to the second disc body below, the convex rib extends along the circumference of the circular truncated cone, the convex rib is arranged between two adjacent first guide rods and abuts against the inner side wall of the support ring of the first disc body, the inner side wall of the second disc body is provided with a plurality of second guide rods distributed along the circumference of the circular truncated cone at equal intervals, the first guide rods correspond to the second guide rods in position, a labyrinth structure for the flow of gas-liquid mixture is formed between the throttle rib and the second disc body, and the gas-liquid mixture flows through the surface of the first guide rod, the surface of the second guide rod and the labyrinth structure.

[0012] Preferably, the second disc body is provided with a plurality of convex ribs extending along the circumference of the circular truncated cone, the convex ribs are arranged between two adjacent first guide rods and abut against the inner side wall of the support ring of the first disc body, the inner side wall of the second disc body is provided with a plurality of second guide rods distributed along the circumference of the circular truncated cone at equal intervals, the first guide rods correspond to the second guide rods in position, a labyrinth structure for the flow of gas-liquid mixture is formed between the throttle rib and the second disc body, and the gas-liquid mixture flows through the surface of the first guide rod, the surface of the second guide rod and the labyrinth structure.

[0013] Preferably, the first guide rods and the second guide rods are both arc-shaped, and the bending directions of the first guide rods and the second guide rods are consistent with the direction of the gas-liquid flow on the first disc body when the labyrinth-shaped special-shaped disc stack rotates.

[0014] Preferably, there is a gap between the convex rib and the adjacent first guide rod for the gas-liquid mixture to pass through.

[0015] Preferably, in each group of the shaped disc, the throttling effect of the throttling ribs on the gas-liquid mixture gradually decreases from top to bottom.

[0016] Preferably, in each group of the shaped disc, the thickness of the throttling ribs gradually decreases from top to bottom so that the flow area of the labyrinth structure gradually increases; or,

[0017] In each group of the shaped disc, the radial cross section of the throttling ribs gradually decreases from top to bottom so that the flow area of the labyrinth structure gradually increases; or,

[0018] In each group of the shaped disc, the throttling ribs comprise a plurality of throttling sections, and the spacing between each throttling section of the throttling ribs gradually increases from top to bottom so that the flow area of the labyrinth structure gradually increases.

[0019] A centrifugal gas-liquid separator comprising the labyrinth-shaped disc stack of any one of the above.

[0020] Preferably, the centrifugal gas-liquid separator further comprises a housing, a transmission shaft, a press shell, and a driving member, the press shell comprises a first press shell and a second press shell, the first press shell and the second press shell are in the shape of a hollow truncated cone, the upper and lower ends of the first press shell and the upper and lower ends of the second press shell are provided with openings that are in communication with each other, the upper end opening of the first press shell is provided with a second shaft hole, the upper end opening of the second press shell is provided with a third shaft hole and a second gas passage that surrounds the third shaft hole, the first press shell, the labyrinth-shaped disc stack, and the second press shell are sequentially sleeved, the transmission shaft penetrates through the second shaft hole of the first press shell, the third shaft hole of the second press shell, and the first shaft hole of each group of shaped discs, the transmission shaft is used to drive the first press shell, the plurality of groups of shaped discs, and the second press shell to rotate, the housing comprises an air inlet, an air outlet, and a plurality of liquid outlets, the air inlet and the liquid outlets are located below the air outlet, the driving member is arranged outside the housing and is used to drive the transmission shaft to rotate, and the liquid outlets are arranged at the bottom end of the housing.

[0021] Preferably, the centrifugal gas-liquid separator further comprises a connector, the connector is arranged in the air inlet and / or the air outlet, and the connector is used to collide with the gas-liquid mixture entering from the air inlet and the gas-liquid mixture discharged from the air outlet.

[0022] Compared with the prior art, the beneficial effects of the present application at least include:

[0023] When the gas-liquid mixture enters into the labyrinth structure of the first disc body and the second disc body, the movement track of the gas-liquid mixture is distributed along the labyrinth structure, thus, the residence time of the gas-liquid mixture in the labyrinth-shaped disc stack can be prolonged, so as to collide with the first disc body and the second disc body sufficiently, and the separation effect of the gas-liquid is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure diagram of the first disc body in the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 1 ;

[0025] Figure 2 is a structure diagram of the first disc body in the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 2 ;

[0026] Figure 3 is a structure diagram of the second disc body in the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 1 ;

[0027] Figure 4 is a structure diagram of the second disc body in the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 2 ;

[0028] Figure 5 is a structure diagram of the disc group of the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 1 ;

[0029] Figure 5a is an enlarged diagram of the structure of A part in Figure 5 ;

[0030] Figure 5b is an enlarged diagram of the structure of B part in Figure 5 , which is a flow path diagram of the gas-liquid mixture entering between the first disc body and the second disc body;

[0031] Figure 6 is a structure diagram of the disc group of the labyrinth-shaped disc stack of the first structure of the embodiment of the present application Figure 2 ;

[0032] Figure 7 is a structure diagram of the disc group of the labyrinth-shaped disc stack of the second structure of the embodiment of the present application;

[0033] Figure 8 is a sectional diagram of the centrifugal gas-liquid separator of the embodiment of the present application;

[0034] Figure 9is a schematic diagram of an external structure of a centrifugal gas-liquid separator according to an embodiment of the present application;

[0035] Figure 10 is a schematic diagram of a structure of a first compression shell in a centrifugal gas-liquid separator according to an embodiment of the present application;

[0036] Figure 11 is a schematic diagram of a structure of a second compression shell in a centrifugal gas-liquid separator according to an embodiment of the present application;

[0037] Figure 12 is a schematic diagram of a cross section of a cyclone barrel in a centrifugal gas-liquid separator according to an embodiment of the present application.

[0038] In the figure: 1, first disc body; 100, upper ring; 101, lower ring; 102, support ring; 103, first flow guide rod; 2, second disc body; 3, flow passage; 300, first shaft hole; 301, first gas passage; 4, through slot; 5, throttling rib; 6, convex rib; 7, second flow guide rod; 8, gap; 9, shell; 10, transmission shaft; 11, gas inlet impeller; 12, first compression shell; 120, second compression shell; 13, second shaft hole; 14, third shaft hole; 15, second gas passage; 16, gas inlet; 17, gas outlet; 18, cyclone barrel; 19, connector; 20, flow guide rib. DETAILED DESCRIPTION

[0039] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0040] The words expressing position and direction described in the present application are described with reference to the accompanying drawings, but changes can be made according to needs, and the changes are included in the scope of protection of the present application.

[0041] The present application provides a labyrinth-shaped special disc stack, comprising a plurality of special disc groups stacked.

[0042] As a first structure of the labyrinth-shaped special disc stack, as shown in Figures 1 to 8As shown, each shaped disc set comprises a first disc body 1 and a second disc body 2, the first disc body 1 and the second disc body 2 are in the shape of hollow truncated cone, the upper and lower ends of the first disc body 1 and the second disc body 2 are provided with openings communicating with each other, the first disc body 1 is used for sleevedly matched in the second disc body 2, and a labyrinth structure for flowing of gas-liquid mixture is formed between the first disc body 1 and the second disc body 2; a corresponding flow part 3 is arranged in the upper end opening of the first disc body 1 and the second disc body 2, the flow part 3 comprises a first shaft hole 300 and a plurality of first gas passage 301 distributed around the first shaft hole 300, the first shaft hole 300 is used for penetrating the transmission shaft 10 of the centrifugal gas-liquid separator, the two ends of the transmission shaft 10 can be supported by bearings, the transmission shaft 10 drives the rotation of the labyrinth shaped disc stack, and after the gas-liquid mixture passes through the first gas passage 301, part of the gas-liquid mixture will enter the labyrinth structure of each labyrinth shaped disc stack, and the gas-liquid mixture will move along the track of the labyrinth structure. Compared with the disc in the prior art, after the gas-liquid mixture enters the separation space between the two discs, the surface of the disc is smooth, so the gas-liquid mixture stays in the separation space for a short time, which leads to the inability to fully separate the gas and liquid, and the gas-liquid separation effect is poor. By adopting the labyrinth shaped disc stack in the embodiment, the gas-liquid mixture can move along the track of the labyrinth structure after entering the inlet of the separation space, and fully collide with the first disc body 1 and the second disc body 2 when passing through the labyrinth structure, thereby prolonging the residence time of the gas-liquid mixture in the labyrinth shaped disc stack and improving the gas-liquid separation effect.

[0043] As a further implementation of the embodiment, as Figure 1 and Figure 8As shown, the first disc body 1 comprises an upper ring 100, a lower ring 101, a plurality of support rings 102 and a plurality of first flow guide rods 103, the first flow guide rods 103 are sequentially connected from top to bottom to the upper ring 100, the plurality of support rings 102 and the lower ring 101 and extend to the bottom end inside the lower ring 101, the inside of the lower ring 101 is the inside on the corresponding first disc body 1 inner surface of the lower ring 101, the plurality of support rings 102 are distributed along the generatrix of the circular truncated cone, the plurality of first flow guide rods 103 are distributed along the circumference of the circular truncated cone, a through groove 4 is formed between every two adjacent support rings 102 and every two adjacent first flow guide rods 103, a through groove 4 is also formed between the upper ring 100 or the lower ring 101 and adjacent support rings 102 and every two adjacent first flow guide rods 20, respectively, a throttling rib 5 protruding from the surface of the first disc body 1 is arranged in each through groove 4, the throttling rib 5 in the uppermost through groove 4 of the first disc body 1 is connected with the upper ring 100 and does not close the through groove 4, and the rest of the throttling ribs 5 are arranged in the through grooves 4 and divide or do not divide the through grooves 4 into two parts, when the first disc body 1 is sleeved with the second disc body 2, there is a gap between each throttling rib 5 and the outer surface of the second disc body 2 for the gas-liquid mixture to pass through, the through groove 4 is connected with the separation space between the first disc body 1 and the second disc body 2, the plurality of support rings 102 are distributed along the generatrix of the circular truncated cone at equal intervals, the plurality of first flow guide rods 103 are distributed along the circumference of the circular truncated cone at equal intervals, the second disc body 2 is provided with a plurality of convex ribs 6 extending along the circumference of the circular truncated cone, the convex ribs 6 are arranged between two adjacent first flow guide rods 103 and abut against the inner side wall of the support ring 102 of the first disc body 1, it should be noted that the convex rib 6 is connected with only one of the two adjacent first flow guide rods 103 and there is a gap 8 between the convex rib 6 and the other first flow guide rod 103 for the separated gas-liquid to pass through, the inner side wall of the second disc body 2 is provided with a plurality of second flow guide rods 7 distributed along the circumference of the circular truncated cone at equal intervals, the first flow guide rod 103 corresponds to the second flow guide rod 7, the throttling rib 5 and the second disc body 2 form a labyrinth structure for the gas-liquid mixture to flow, and the gas-liquid mixture passes through the surface of the first flow guide rod 103, the surface of the second flow guide rod 7 and the labyrinth structure.

[0044] Specifically, when a plurality of labyrinth-shaped special-shaped disc bodies are stacked together, the inner wall of the second disc body 2 in the upper labyrinth-shaped special-shaped disc body abuts against the convex rib 6 of the first disc body 1 in the labyrinth-shaped special-shaped disc body below, the second flow guide rod 7 of the second disc body 2 in the upper labyrinth-shaped special-shaped disc body abuts against the first flow guide rod 103 of the first disc body 1 in the labyrinth-shaped special-shaped disc body below and fills between two adjacent convex ribs 6 on the first disc body 1 in the labyrinth-shaped special-shaped disc body, in order to facilitate understanding, as shown in Figure 5bThe shown content is a flow path schematic of the gas-liquid mixture entering between the first disc body and the second disc body, the arrows are the flow paths, the moving path of the gas-liquid mixture is as follows: after the gas-liquid mixture enters from the first gas channel 301, it enters the inlet of the separation space between each first disc body 1 and second disc body 2, then enters the through slot 4 close to the upper ring 100 and passes through the gap below the throttle rib 5 in the through slot 4, the gas-liquid mixture collides with the two first guide rods 103 and the two support rings 102 constituting the through slot 4, the separated liquid and part of the gas-liquid mixture pass through the gap 8, and most of the gas-liquid mixture passes through the unsealed part of the through slot 4, then enters another through slot 4 below the through slot 4, the gas-liquid mixture enters the upper half of the through slot 4, then passes through the gap in the through slot 4, and finally exits from the lower half of the through slot 4, the liquid separated from the gas-liquid mixture after colliding with the two guide rods and the support ring 102 constituting the through slot 4 flows out from the gap 8 in the through slot 4, the remaining gas-liquid mixture enters the next through slot 4 and repeats the above path until it passes through the outlet of the separation space or passes through the part of the through slot 4 constituted by the lower ring 101 which is not covered by the throttle rib 5, thereby completing the gas-liquid separation. By adopting the labyrinth structure, the moving path of the gas-liquid mixture is distributed along the labyrinth structure, thereby greatly increasing the residence time of the gas-liquid mixture on the labyrinth-shaped disc body and improving the gas-liquid separation effect.

[0045] As a further embodiment of the present embodiment, as shown in Figure 2 and Figure 4 The first guide rod 103 and the second guide rod 7 are both arc-shaped, and the bending direction of the first guide rod 103 and the second guide rod 7 is consistent with the direction of the gas-liquid flow on the first disc body 1 when the labyrinth-shaped disc stack rotates. The arrangement of this structure makes the labyrinth-shaped disc body rotate, and the gas-liquid mixture moves in the direction of the first guide rod 103 and the second guide rod 7 under the action of centrifugal force after entering the separation space between the first disc body 1 and the second disc body 2 or the cavity between the two stacked labyrinth-shaped disc bodies, which changes the flow path of the gas-liquid mixture and effectively improves the gas-liquid separation effect.

[0046] As a further embodiment of the present embodiment, as shown in Figure 1As shown, in each group of the special-shaped disc set, the throttling effect of the throttling ribs 5 on the gas-liquid mixture gradually decreases in the direction from top to bottom, in other words, the throttling effect of the throttling ribs 5 on the gas-liquid mixture in the upper group of the special-shaped disc set is greater than that in the lower group of the special-shaped disc set. Specifically, the greater the throttling effect, the smaller the flow rate of the gas-liquid mixture entering the separation space of the special-shaped disc set, and the smaller the throttling effect, the greater the flow rate of the gas-liquid mixture entering the separation space of the special-shaped disc set.

[0047] In the present application, the rotating speed of the transmission shaft 10 can be 6500-7500 rpm, for example, 7000 rpm, compared with the existing rotating speed of up to 10,000 rpm, by reducing the rotating speed, the damage to the bearing supporting the transmission shaft 10 can be significantly reduced, and the reliability of the centrifugal gas-liquid separator can be significantly improved. The number of discs in the labyrinth special-shaped disc stack can be 15-30, preferably 20-25, compared with the existing number of discs of 40-50, by reducing the number of discs, the volume and cost of the centrifugal gas-liquid separator can be reduced, so that the centrifugal gas-liquid separator can be assembled on more types of engines, and the reduction of the number of discs can reduce the weight of the disc stack and reduce the damage to the bearing. The gap between the discs can be 0.8-0.9 mm, compared with the existing disc gap of about 0.4 mm, by increasing the gap between the discs, the oil sludge can be prevented from blocking the disc gap, and the reliability can be improved.

[0048] Only reducing the rotating speed of the transmission shaft 10, reducing the number of discs and increasing the gap between the discs can cause the separation efficiency to decrease to varying degrees, and can also cause the pressure rise between the gas outlet 17 and the gas inlet 16 of the centrifugal gas-liquid separator to decrease, thereby causing the negative pressure in the crankcase to decrease, which can easily cause liquid and gas to overflow and reduce reliability, wherein the decrease in separation efficiency is mainly due to the phenomenon of flow imbalance.

[0049] Specifically, in the existing case of a large number of discs and a small disc gap, the air flow resistance between the discs is large, and the gas-liquid mixture is more likely to flow uniformly through the gaps between the discs in the upward and downward directions. When the number of discs is reduced and the disc gap is increased, when the gas-liquid mixture flows through the gas flow channel of the stacked special-shaped disc set from bottom to top, under the action of flow inertia, the gas-liquid mixture tends to flow out through the gaps between the discs close to the upper side, resulting in a large flow rate of the gas-liquid mixture between the discs close to the upper side and a small flow rate of the gas-liquid mixture between the discs close to the lower side, causing the phenomenon of flow imbalance. The direct result of flow imbalance is that the residence time of small droplets (about 1 μm) of liquid in the gas-liquid mixture between the discs close to the upper side on the disc is shortened, causing the small droplets to be unable to coalesce into large droplets, making the small droplets more likely to be discharged with the gas from the centrifugal gas-liquid separator, and ultimately causing the separation efficiency to decrease.

[0050] To overcome the above-mentioned defects, in each group of the shaped disc from top to bottom, the thickness of the throttle rib 5 gradually decreases to gradually increase the flow area of the labyrinth structure; or, in each group of the shaped disc from top to bottom, the radial section of the throttle rib 5 gradually decreases to gradually increase the flow area of the labyrinth structure; or, in each group of the shaped disc from top to bottom, the throttle rib 5 includes a plurality of throttle sections, and the spacing between each throttle section of the throttle rib 5 gradually increases to gradually increase the flow area of the labyrinth structure. Through the above-mentioned settings, the situation that the flow of the gas-liquid mixture in the separation space between the shaped discs near the upper end of the shell 9 is too large can be effectively overcome, the flow of the gas-liquid mixture in the separation space between the shaped discs near the lower end is increased, the utilization rate of all the shaped discs is improved, and finally the effects of flow balance and improved separation efficiency are achieved.

[0051] As a second structure of the labyrinth-shaped shaped disc stack, as shown in Figure 7 The difference between the first structure of the labyrinth-shaped shaped disc stack and the second structure of the labyrinth-shaped shaped disc stack is that, along the extension direction of the first flow guide rod 103, after every two through grooves 4, a third through groove 4 is provided with a throttle rib 5 covering at least part of it, and a convex rib 6 connected with the second disc body 2 is arranged below the support ring 102 adjacent to the throttle rib 5. The convex rib 6 extends along the circumference of the circular table, and the convex rib 6 is arranged between two adjacent first flow guide rods 103 and abuts against the inner side wall of the support ring 102 of the first disc body 1. A plurality of second flow guide rods 7 are arranged on the inner side wall of the second disc body 2 and are distributed at equal intervals along the circumference of the circular table. The first flow guide rod 103 corresponds to the second flow guide rod 7 in position, and the labyrinth structure for the flow of the gas-liquid mixture is formed between the throttle rib 5 and the second disc body 2. The gas-liquid mixture passes through the surface of the first flow guide rod 103, the surface of the second flow guide rod 7, and the labyrinth structure. Specifically, when the gas-liquid mixture enters from the inlet of the separation space, the gas-liquid mixture first passes through the first through groove 4 close to the upper ring 100. Due to the blockage of the first convex rib 6, the gas-liquid mixture passes through the upper end opening of the first through groove 4. Subsequently, part of the gas-liquid mixture rotates in the gas flow dead zone (the throttle rib 5 in the third through groove 4 is connected with the support ring 102 which constitutes the second through groove 4 and the third through groove 4 to form the gas flow dead zone). The gas flow dead zone makes the gas-liquid mixture collide sufficiently to improve the separation effect. The liquid flows downward from the gap 8, and the gas-liquid mixture that does not rotate in the gas flow dead zone directly flows from the second through groove 4 to the fourth through groove 4 and repeats the above path until it passes through the outlet of the separation space or passes through the part of the through groove 4 not covered by the throttle rib 5 formed by the lower ring 101, thereby completing the gas-liquid separation. By adopting the labyrinth structure, the moving path of the gas-liquid mixture is distributed along the labyrinth structure, thereby greatly increasing the residence time of the gas-liquid mixture on the labyrinth-shaped shaped disc body and improving the gas-liquid separation effect.

[0052] The present application also provides a centrifugal gas-liquid separator comprising the labyrinth-shaped special-shaped disc stack of any one of the above.

[0053] As a further implementation of the present embodiment, as shown in Figures 1 to 12 , the centrifugal gas-liquid separator further comprises a housing 9, a transmission shaft 10, an air inlet impeller 11, a compression shell and a driving member.

[0054] Referring to Figure 10 and Figure 11 , the compression shell comprises a first compression shell 12 and a second compression shell 120, the first compression shell 12 and the second compression shell 120 are in the shape of a hollow truncated cone, the upper and lower ends of the first compression shell 12 and the upper and lower ends of the second compression shell 120 are provided with openings that are in communication with each other, the upper end opening of the first compression shell 12 is provided with a second shaft hole 13, the upper end opening of the second compression shell 120 is provided with a third shaft hole 14 and a second gas passage 15 distributed around the third shaft hole 14, and the first compression shell 12, the labyrinth-shaped special-shaped disc stack and the second compression shell 120 are sequentially sleeved.

[0055] The transmission shaft 10 penetrates the second shaft hole 13 of the first compression shell 12, the third shaft hole 14 of the second compression shell 120 and the first shaft hole 300 of the plurality of special-shaped disc groups, and the transmission shaft 10 is used to drive the first compression shell 12, the plurality of special-shaped disc groups and the second compression shell 120 to rotate, and the air inlet impeller 11 is connected to the transmission shaft 10 and located below the second compression shell 120. The rotating air inlet impeller 11 can increase the disturbance of the gas-liquid mixture and generate suction on the gas-liquid mixture, so that the gas-liquid mixture enters the housing 9 in a rotating high-speed state, which improves the collision probability of the gas-liquid mixture and the disc, not only improves the separation efficiency of the gas-liquid mixture, but also has a supercharging effect, which can keep a high pressure rise between the air inlet 16 and the air outlet 17 of the centrifugal gas-liquid separator, and the pressure rise is conducive to maintaining a larger negative pressure in the crankcase, avoiding the overflow of oil and gas in the crankcase, and improving the reliability.

[0056] The shell 9 comprises an air inlet 16, an air outlet 17 and a plurality of liquid outlets, the air inlet 16 and the liquid outlets are located below the air outlet 17 and preferably close to the bottom of the shell 9, the bottom in the shell 9 is provided with a cyclone cylinder 18 with an Archimedes spiral flow channel, the cyclone cylinder 18 is communicated with the air inlet 16 and is arranged below the air inlet impeller 11, the gas-liquid mixture entering from the air inlet 16 flows to the second gas passage 15 after cyclone separation and impeller disturbance in the cyclone cylinder 18, the driving member is arranged outside the shell 9 and is used to drive the rotation of the transmission shaft 10, the liquid outlets are arranged in the cyclone cylinder 18 and at the bottom end of the shell 9 outside the cyclone cylinder 18. After the gas-liquid mixture enters the cyclone cylinder 18 through the air inlet 16, a vortex-shaped gas flow path is formed, after the gas-liquid is accelerated and separated in the cyclone cavity, part of the gas-liquid particles with large mass are separated in the cyclone cavity, the remaining part of the gas-liquid mixture enters the inside of the shell 9 in a rotating manner, and finally is separated by the disc and is thrown to the inner side wall of the shell. The flow channel in the form of Archimedes spiral line not only has high separation efficiency, but also can accelerate the flow of gas, and has a better boosting effect, under the conditions of reducing the rotation speed of the transmission shaft 10, reducing the number of discs and increasing the gap between the discs, the boosting effect of the above structure can keep a high pressure rise between the air outlet 17 and the air inlet 16 of the centrifugal gas-liquid separator.

[0057] Specifically, after the gas-liquid mixture enters from the air inlet 16, it flows to the second gas passage 15 after cyclone separation in the cyclone cylinder 18 and disturbance of the air inlet impeller 11, the driving member is arranged outside the shell 9 and is used to drive the rotation of the transmission shaft 10, the driving member can be a motor or other driving structure, which is not limited in the embodiment, the rotation of the transmission shaft 10 drives the rotation of the labyrinth-shaped special disc body, the first pressure shell 12, the second pressure shell 120 and the air inlet impeller 11, the air inlet impeller 11 and the second pressure shell 120 are arranged in a structure similar to a gas pump, which plays a role of pumping gas during rotation, and can improve the upward flow rate of the gas-liquid mixture after passing through the second gas passage 15, the gas-liquid mixture enters the labyrinth-shaped special disc body and is separated into gas and gas-liquid under the action of centrifugal force, the gas finally flows out from the air outlet 17, and the gas-liquid finally flows out from the liquid outlets arranged in the cyclone cylinder 18 and at the bottom end of the shell 9 outside the cyclone cylinder 18.

[0058] As a further embodiment of the present embodiment, as Figure 8 and Figure 9As shown, the centrifugal gas-liquid separator further comprises a connector 19 arranged in the gas inlet 16 and / or the gas outlet 17, and the connector 19 is detachably arranged in the gas inlet 16 and the gas outlet 17, respectively. When the gas-liquid mixture enters the gas inlet 16, the gas-liquid mixture collides with the connector 19 arranged in the gas inlet 16 to perform the primary separation of gas and liquid. The connector 19 arranged in the gas outlet 17 is used to collide with the residual gas-liquid in the gas to further reduce the outflow of liquid from the gas outlet 17, thereby further improving the separation effect.

[0059] As a further implementation manner of the embodiment, as shown in Figure 8 As shown, the inner side wall of the shell 9 is uniformly distributed with a plurality of guide vanes 20 extending from the upper end of the inner side wall of the shell 9 to the lower end of the inner side wall of the shell 9. The guide vanes 20 are arranged to collect the liquid adsorbed on the inner side wall of the shell 9, thereby collecting the liquid with a smaller volume into liquid with a larger volume, so as to improve the dripping speed of the separated liquid.

[0060] As a further implementation manner of the embodiment, the inner wall of the shell 9 and the surface of the guide vanes 20 are coated with an oleophobic coating, such as one of a polyolefin layer, a polycarbonate layer, a polyamide layer, a polyacrylonitrile layer, a fluorine-free acrylic ester layer, a molten paraffin layer, a perfluoropolyether layer, a polytetrafluoroethylene layer, a polyperfluoroethylene-propylene layer, a tetrafluoroethylene copolymer layer, a polyvinylidene fluoride layer, and a soluble tetrafluoroethylene layer. The arrangement of the oleophobic coating can improve the dripping speed of the liquid collected on the inner side wall of the shell 9, and it is not easy to form a wall-hanging condition.

[0061] In order to further demonstrate the separation effect of the embodiment, under the condition that the remaining parameters are the same, the rotation speed of the disc 1 is changed, thereby comparing the gas-liquid separator in the prior art (no labyrinth structure is formed between the first disc body and the second disc body for the gas-liquid mixture to flow) with the gas-liquid separator in the embodiment as follows. As shown in Table 1, the separation efficiency is embodied by collecting the amount of oil during the experiment.

[0062] Table 1

[0063]

[0064] From the above data comparison, it can be found that by using the centrifugal gas-liquid separator of the embodiment, the separation efficiency is higher than that of the centrifugal gas-liquid separator in the prior art under the same rotation speed. Especially under the rotation speed condition of 5000-7000 rpm, the centrifugal gas-liquid separator of the embodiment has a better separation efficiency. Moreover, the higher the rotation speed, the better the separation effect when the centrifugal gas-liquid separator of the embodiment is used.

[0065] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made to the above-described embodiments without departing from the principles and spirit of the present application, and all such changes, modifications, substitutions and variations are to be construed as falling within the scope of the present application as defined by the appended claims.

Claims

1. A stack of interlocking profiled discs, characterised in that, The application relates to a stacked labyrinth disc group, which comprises a plurality of first disc bodies and a plurality of second disc bodies, wherein the first disc bodies and the second disc bodies are hollow truncated cone structures, the upper and lower ends of the first disc bodies and the second disc bodies are provided with openings which are in communication with each other, the first disc bodies are sleeved and matched with the second disc bodies, and a labyrinth structure for flowing gas-liquid mixture is formed between the first disc bodies and the second disc bodies. The upper end openings of the first disc bodies and the second disc bodies are provided with corresponding flow parts, the flow part comprises a first shaft hole and a plurality of first gas flowing channels which are distributed around the first shaft hole. The first disc body comprises an upper ring, a lower ring, a plurality of supporting rings and a plurality of first flow guide rods, the first flow guide rods are sequentially connected with the upper ring, the supporting rings and the lower ring from top to bottom and extend to the bottom end of the inner side of the lower ring, the supporting rings are distributed along the generatrix of the truncated cone, the first flow guide rods are distributed along the circumference of the truncated cone, a through groove is formed between every two adjacent supporting rings and every two adjacent first flow guide rods, the upper ring, every two adjacent first flow guide rods and the adjacent supporting rings are crossed to form a through groove, the lower ring, every two adjacent first flow guide rods and the adjacent supporting rings are crossed to form a through groove, and at least part of the through grooves are provided with throttling ribs which protrude from the surface of the first disc body. The second disc body is provided with a plurality of convex ribs which extend along the circumference of the truncated cone, the convex ribs are arranged between every two adjacent first flow guide rods and abut against the inner side wall of the supporting ring of the first disc body, the inner side wall of the second disc body is provided with a plurality of second flow guide rods which are distributed along the circumference of the truncated cone at equal intervals, the first flow guide rods correspond to the second flow guide rods in position, a labyrinth structure for flowing gas-liquid mixture is formed between the throttling ribs and the second disc body, and the gas-liquid mixture flows through the surface of the first flow guide rods, the surface of the second flow guide rods and the labyrinth structure. The supporting rings are distributed along the generatrix of the truncated cone at equal intervals, and the first flow guide rods are distributed along the circumference of the truncated cone at equal intervals.

2. The labyrinthine hetero-disc stack of claim 1, wherein, In the extension direction of the first flow guide rods, a throttling rib is arranged in the third through groove after every two through grooves, the supporting ring adjacent to the throttling rib is provided with a convex rib which is connected with the second disc body and extends along the circumference of the truncated cone, the convex rib is arranged between every two adjacent first flow guide rods and abut against the inner side wall of the supporting ring of the first disc body, the inner side wall of the second disc body is provided with a plurality of second flow guide rods which are distributed along the circumference of the truncated cone at equal intervals, the first flow guide rods correspond to the second flow guide rods in position, a labyrinth structure for flowing gas-liquid mixture is formed between the throttling ribs and the second disc body, and the gas-liquid mixture flows through the surface of the first flow guide rods, the surface of the second flow guide rods and the labyrinth structure.

3. The labyrinthine hetero-disc stack of claim 1, wherein, The first flow guide rods and the second flow guide rods are in arc shape, and the bending directions of the first flow guide rods and the second flow guide rods are consistent with the direction of the gas-liquid flow on the first disc body when the stacked labyrinth disc group rotates.

4. The labyrinthine hetero-disc stack of claim 1 or 3, wherein, ​ 5. The labyrinth-shaped disc stack of claim 4, wherein, The convex rib and the adjacent first flow guide rod have a gap for the gas-liquid mixture to pass through.

6. The labyrinthine hetero-disc stack of claim 1, wherein, In each group of the shaped discs, the throttling effect of the throttling ribs on the gas-liquid mixture gradually decreases from top to bottom.

7. The labyrinth-shaped disc stack of claim 6, wherein, In each group of the shaped discs, the thickness of the throttling ribs gradually decreases from top to bottom so that the flow area of the labyrinth structure gradually increases; or, In each group of the shaped discs, the radial cross section of the throttling ribs gradually decreases from top to bottom so that the flow area of the labyrinth structure gradually increases; or, In each group of the shaped discs, the throttling ribs include a plurality of throttling sections, and the spacing between the throttling sections of each throttling rib gradually increases so that the flow area of the labyrinth structure gradually increases.

8. A centrifugal gas-liquid separator characterized by, The labyrinth-shaped disc stack of any one of claims 1 to 7.

9. The centrifugal gas-liquid separator of claim 8, wherein, The centrifugal gas-liquid separator further comprises a housing, a transmission shaft, a compression shell, and a driving member, the compression shell comprises a first compression shell and a second compression shell, the first compression shell and the second compression shell are in the shape of a hollow truncated cone, the upper and lower ends of the first compression shell and the upper and lower ends of the second compression shell are provided with openings that are in communication with each other, the upper end of the first compression shell is provided with a second shaft hole, the upper end of the second compression shell is provided with a third shaft hole and a second gas passage that surrounds the third shaft hole, the first compression shell, the labyrinth-shaped disc stack, and the second compression shell are sequentially sleeved, the transmission shaft penetrates through the second shaft hole of the first compression shell, the third shaft hole of the second compression shell, and the first shaft hole of each group of shaped discs, the transmission shaft is used to drive the first compression shell, the plurality of groups of shaped discs, and the second compression shell to rotate, the housing comprises an air inlet, an air outlet, and a plurality of liquid outlets, the air inlet and the liquid outlets are located below the air outlet, the driving member is arranged outside the housing and is used to drive the transmission shaft to rotate, and the liquid outlets are arranged at the bottom end of the housing.

10. The centrifugal gas-liquid separator of claim 9, wherein, The centrifugal gas-liquid separator further comprises a connector, the connector is arranged in the air inlet and / or the air outlet, and the connector is used to collide with the gas-liquid mixture entering from the air inlet and the gas-liquid mixture discharged from the air outlet.

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