A stacking body and centrifugal separator

Abstract

The present invention discloses a stacking body and a centrifugal separator. The stacking body comprises a plurality of separation discs stacked in sequence, and each two adjacent separation discs are stacked to form a separation gap for separating a gas-liquid mixture, and a first through hole and a plurality of first flow channels surrounding the first through hole are arranged in the upper opening of the separation disc, and the first through hole of each separation disc is arranged correspondingly, and the first flow channel on each separation disc is arranged correspondingly, and along the stacking direction of the stacking body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation discs has an increasing trend. The stacking body makes full use of the separation discs and promotes flow balance, thereby improving the separation effect and separation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal separators, and in particular to a stacked body and a centrifugal separator. Background Art

[0002] The centrifugal separator is the main component of the crankcase ventilation system. It efficiently separates the oil in the crankcase blowby gas. Its separation performance has an important impact on the reliability and emissions of the engine.

[0003] The working principle of the active centrifugal separator is to rely on external input energy to form a rotating vortex in the separator, and the particles in the mixed gas flow are separated under the action of centrifugal force. A plurality of conical separation discs are installed on the rotating shaft of the active centrifugal separator. The separation discs have through holes near the rotating shaft, which are the flow channels of the mixture. When the rotating shaft moves, the mixed gas will be thrown out along the separation gap between the conical separation discs under the action of centrifugal force, achieving the purpose of gas-liquid separation.

[0004] However, in the prior art, when the gas-liquid mixture enters the separation plate from the bottom of the outer shell, due to the action of inertia, a large amount of the gas-liquid mixture will enter the corresponding separation gap through the inner hole in the separation plate near the top of the outer shell, and a small amount of the gas-liquid mixture will enter the corresponding separation gap through the inner hole in the separation plate near the bottom of the outer shell, thereby causing an imbalance in the flow between the separation plate near the top of the outer shell and the separation plate near the bottom of the outer shell, and a low separation efficiency. Summary of the invention

[0005] The object of the present invention is to provide a stack and a centrifugal separator, which can make full use of the separation discs to promote flow balance and also improve the separation effect and separation efficiency.

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

[0007] A stacking body comprises a plurality of separation discs stacked in sequence, wherein each two adjacent separation discs are stacked to form a separation gap for separating a gas-liquid mixture, wherein a first through hole and a plurality of first flow channels surrounding the first through hole are arranged in the upper opening of the separation disc, and the first through hole of each separation disc is arranged correspondingly, and the first flow channel on each separation disc is arranged correspondingly, and along the stacking direction of the stacking body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation discs tends to increase.

[0008] Preferably, from top to bottom, the plurality of separation plates are divided into a plurality of groups of separation plates, and the sum of the cross-sectional areas of the first flow channels of the individual separation plates in the lower group of separation plates is greater than the sum of the cross-sectional areas of the first flow channels of the individual separation plates in the upper group of separation plates.

[0009] Preferably, the number of separation discs in each group of separation discs is the same or different, and the cross-sectional areas of the first flow channels of the separation discs in each group of separation discs are the same.

[0010] Preferably, the sum of the cross-sectional areas of the first flow channels of the separation disk increases gradually from top to bottom.

[0011] Preferably, the sum of the cross-sectional areas of the first flow channels of the separation disks located at the top of the stack is 1000 mm 2 The sum of the cross-sectional areas of the first flow channels of the separation disks at the bottom of the stack is 1600 mm 2 , along the stacking direction of the stacked body, the sum of the cross-sectional areas of the first flow channels increases by 24-30 mm from top to bottom. 2 .

[0012] Preferably, the separation disk is a hollow truncated cone structure, and upper and lower ends of the separation disk are provided with openings communicating with each other.

[0013] Preferably, a plurality of drainage ribs are arranged at equal or unequal intervals on the inner side wall of the separation disk, and the drainage ribs extend from the upper opening to the lower opening of the separation disk and the thickness gradually increases from top to bottom.

[0014] A centrifugal separator comprises the stacking body described in any one of the above items.

[0015] Preferably, the centrifugal separator includes a first pressure plate and a second pressure plate in a hollow truncated cone-shaped structure, the first pressure plate is sleeved above the separation disk located at the top of the stacking body and covers at least the first flow channel, the first pressure plate is provided with a second through hole corresponding to the position of the first through hole from top to bottom, the second pressure plate is sleeved below the separation disk at the bottom of the stacking body, the upper and lower ends of the second pressure plate are provided with connecting openings, the upper end opening of the second pressure plate is provided with a third through hole and a plurality of second flow channels distributed around the third through hole, the third through hole corresponds to the position of the first through hole, and the first flow channel corresponds to the position of the second flow channel.

[0016] Preferably, the centrifugal separator also includes an outer shell and a rotating shaft, the outer shell includes an air inlet, an exhaust port and a liquid outlet, the exhaust port is close to the upper end of the outer shell, the air inlet and the liquid outlet are close to the lower end of the outer shell, the separation discs are stacked on the rotating shaft, the rotating shaft is used to drive the first pressure plate, the second pressure plate and the plurality of separation discs to rotate so that the gas-liquid mixture entering from the air inlet is separated into gas and liquid under the centrifugal separation action of the separation discs, the separated gas is discharged outwardly through the exhaust port, and the separated liquid is discharged outwardly through the liquid outlet, and throttling ribs are provided on the outer side walls of at least part of the separation discs, the throttling effect of the throttling ribs of the separation discs close to the upper end of the outer shell on the gas-liquid mixture is greater than the throttling effect of the throttling ribs of the separation discs close to the lower end of the outer shell on the gas-liquid mixture.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least:

[0018] Along the stacking direction of the stacking body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation disks tends to increase, thereby reducing the flow rate of the gas-liquid mixture passing through the first flow channels of the upper separation disk and increasing the flow rate of the gas-liquid mixture passing through the first flow channels of the lower separation disk, so that the separation disks can be fully utilized to promote flow balance, while also improving the separation effect and separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional schematic diagram of a centrifugal separator according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of two separation discs stacked together in a stacking body according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the separation disk in the stacking body of an embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a first pressing plate in a centrifugal separator according to an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a second pressing plate in a centrifugal separator according to an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the external structure of a centrifugal separator according to an embodiment of the present invention;

[0025] Figure 7 is a cross-sectional schematic diagram of a cyclone element in a centrifugal separator according to an embodiment of the present invention;

[0026] Figure 8 It is a schematic diagram of the force analysis of the liquid drop on the separation disk;

[0027] Fig. 9 It is a schematic diagram of gas-liquid flow when the air inlet and the exhaust port are respectively arranged on the upper and lower sides of the shell.

[0028] In the figure: 1, separation disc; 100, first through hole; 101, first flow channel; 2, separation gap; 3, drainage rib; 4, first pressure plate; 400, second through hole; 5, second pressure plate; 500, third through hole; 501, second flow channel; 6, bushing; 7, annular sleeve; 8, fan blade; 9, outer casing; 10, rotating shaft; 11, air inlet; 12, exhaust port; 13, throttling rib; 14, cyclone element; 15, spoiler. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0030] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present invention.

[0031] The present invention provides a stacking body that can be used in a centrifugal separator, comprising a plurality of separation discs 1 stacked in sequence.

[0032] like Figure 1 and Figure 2 As shown, after stacking, each two adjacent separation discs 1 form a separation gap 2 for separating the gas-liquid mixture, and the upper end opening of the separation disc 1 is provided with a first through hole 100 and a plurality of first flow channels 101 surrounding the first through hole 100, and the first through hole 100 of each separation disc 1 is correspondingly provided, and the first flow channels 101 on each separation disc 1 are correspondingly provided, and along the stacking direction of the stacked body, from top to bottom, the sum of the cross-sectional areas of the first flow channels 101 of the separation disc 1 has an increasing trend. In other words, overall, the sum of the cross-sectional areas of the first flow channels 101 of the upper separation disc 1 is small, and the sum of the cross-sectional areas of the first flow channels 101 of the lower separation disc 1 is large.

[0033] Specifically, as a first structure, from top to bottom, a plurality of separation plates 1 are divided into a plurality of groups of separation plates 1, the sum of the cross-sectional areas of the first flow channels 101 of a single separation plate 1 in a lower group of separation plates 1 is greater than the sum of the cross-sectional areas of the first flow channels 101 of a single separation plate 1 in an upper group of separation plates 1, the number of separation plates 1 in each group of separation plates 1 is the same or different, and the cross-sectional areas of the first flow channels 101 of the separation plates 1 in each group of separation plates 1 are the same, or, as a second structure, the sum of the cross-sectional areas of the first flow channels 101 of the separation plates 1 gradually increases from top to bottom. When the gas-liquid mixture enters from the first flow channel 101 of the separation disk 1 located at the bottom of the stacking body, under the action of gas flow inertia, a large amount of gas-liquid mixture will enter the first flow channel 101 of the separation disk 1 located above the stacking body. However, by adopting the above two structures of the stacking body, along the stacking direction of the stacking body, from top to bottom, the sum of the cross-sectional areas of the first flow channel 101 of the separation disk 1 has a tendency to increase, thereby reducing the flow rate of the gas-liquid mixture passing through the first flow channel 101 of the upper separation disk 1, and increasing the flow rate passing through the first flow channel 101 of the lower separation disk 1, so as to reduce the flow rate passing through the separation gap 2 between the two separation disks 1 above the stacking body, and increase the flow rate passing through the separation gap 2 between the two separation disks 1 below the stacking body, and finally achieve the beneficial effect of fully utilizing all the separation disks 1 in the stacking body, which not only promotes flow balance, but also improves separation effect and separation efficiency.

[0034] As a further implementation of this embodiment, the sum of the cross-sectional areas of the first flow channels 101 of the separation discs 1 located at the top of the stack is 1000 mm 2 The sum of the cross-sectional areas of the first flow channels 101 of the separation disc 1 at the bottom of the stack is 1600 mm 2 Along the stacking direction of the stack, the sum of the cross-sectional areas of the first flow channels 101 from top to bottom increases by 24-30 mm 2 By adopting the above structure, when the stack rotates at a speed of 7000 revolutions per minute, the separation gap 2 between every two separation discs 1 will separate 5-10L of gas-liquid mixture per minute. The stack of this embodiment greatly improves the separation effect and separation efficiency compared with the prior art.

[0035] As a further implementation of this embodiment, Figure 2 and Figure 3 As shown, the separation disc 1 has a hollow truncated cone structure, and the upper and lower ends of the separation disc 1 are provided with openings that are interconnected. The upper end opening of the separation disc 1 is provided with a first through hole 100 and a plurality of first flow channels 101 arranged around the first through hole 100. The rotating shaft 10 is used to pass through the first through hole 100, and the rotating shaft 10 drives all the separation discs 1 to rotate.

[0036] In the present invention, the rotation speed of the rotating shaft 10 can be 6500-7500 rpm, for example, 7000 rpm. Compared with the existing rotation speed of up to 10,000 rpm, by reducing the rotation speed, the damage to the bearing supporting the rotating shaft 10 can be significantly reduced, and the reliability of the centrifugal separator can be significantly improved. The number of separation discs 1 in the stack can be 15-30, preferably 20-25. Compared with the existing number of 40-50 separation discs 1, by reducing the number of separation discs 1, the volume and cost of the centrifugal separator can be reduced, so that the centrifugal separator can be assembled on more types of engines, and the reduction in the number of separation discs 1 can reduce the weight of the stack and reduce the damage to the bearing.

[0037] However, merely lowering the rotation speed of the rotating shaft 10, reducing the number of separation discs 1 and increasing the size of the separation gap 2 between the separation discs 1 will lead to a decrease in separation efficiency to varying degrees, and will also lead to a decrease in the pressure rise between the exhaust port 12 and the air inlet 11 of the centrifugal separator, thereby reducing the negative pressure in the crankcase, which is likely to cause liquid and gas to overflow and reduce reliability. Among them, the decrease in separation efficiency is mainly due to the occurrence of flow imbalance.

[0038] Specifically, in the case of a large number of separation discs 1 and a small separation gap 2 between the separation discs 1, the airflow resistance between the separation discs 1 is large, and the gas-liquid mixture is easier to pass through the separation gap 2 between the separation discs 1 in the vertical direction, and the flow imbalance phenomenon is not obvious. When the number of separation discs 1 is reduced and the separation gap 2 between the separation discs 1 is increased, as shown in FIG. Fig. 9 As shown, when the gas-liquid mixture flows from bottom to top through the flow channel of several stacked separation disks 1, the gas-liquid mixture tends to flow out through the separation gaps 2 between the multiple separation disks 1 near the top due to the action of flow inertia, resulting in a large flow of the gas-liquid mixture between the separation disks 1 near the top and a small flow of the gas-liquid mixture between the separation disks 1 near the bottom, resulting in a prominent flow imbalance phenomenon. A direct result of the flow imbalance is that the residence time of small droplets (about 1 μm) of liquid in the gas-liquid mixture between the separation disks 1 near the top on the separation disk 1 is shortened, resulting in the inability of the small droplets to agglomerate into large droplets, making it easier for the small droplets to be discharged from the centrifuge with the gas, ultimately resulting in a decrease in separation efficiency.

[0039] More specifically, refer to Figure 8 , Figure 8 It is a schematic diagram of force analysis of liquid droplets on the separation disk 1. The liquid droplets on the separation disk 1 are acted upon by the drag force and inertial force toward the lower edge of the separation disk 1 and the pressure gradient force toward the upper edge of the separation disk 1. When the resultant force of the pressure gradient force, the drag force and the inertial force tends to be positive, the liquid droplets tend to stay on the separation disk 1.

[0040] Drag force F d for

[0041] Among them, C d is the drag coefficient of the droplet, ρ is the density of the gas phase, v s =vv p is the difference between the velocity of the gas and the velocity of the oil droplets, v is the instantaneous velocity of the gas phase, and v p is the instantaneous velocity of the oil drop, A p is the projected area of ​​the droplet.

[0042] It can be seen that the drag force is the thrust / resistance of the gas phase on the droplets. The direction depends on whether the droplets are lower than / higher than the gas phase velocity. The drag force of the droplets on the separation disk is outward and is proportional to the projected area of ​​the droplets. The smaller the radial velocity of the airflow, the smaller the drag force, which is more conducive to the droplet retention; conversely, the droplet escape increases. When the flow is unbalanced, the flow velocity of the liquid in the gas-liquid mixture between the separation disks 1 near the top increases, the drag force increases, the droplets escape faster, and the separation efficiency decreases.

[0043] Inertial force F MRF F MRF =m p [ω×(ω×r)+2(ω×V p )].

[0044] Among them, m p is the mass of the droplet, ψ is the angular velocity vector of the rotating reference coordinate system, r is the distance vector to the rotation axis, V p is the droplet volume.

[0045] Inertial forces include centrifugal force and Coriolis force (Coriolis force). The inertial force of the droplets on the separation disk is outward and leftward, proportional to the mass of the droplets. As the particle size decreases, turbulent dissipation increases and the influence of the inertial force decreases.

[0046] Pressure gradient force F p for

[0047] Among them, V p is the volume of the droplet, is the gradient of static pressure in the gas phase.

[0048] The pressure gradient force can be understood as a generalized buoyancy. The pressure gradient force of the droplets on the separation disk 1 is inward and proportional to the volume of the oil droplets. A large pressure gradient is likely to appear on the periphery of the separation disk 1, and the value depends on the rotation speed and the flow guide structure. The pressure gradient force increases and the drag force decreases to a critical point, the droplets become suspended, a concentrated area is formed, the residence time increases, and the agglomeration effect is enhanced.

[0049] From the above analysis, it can be seen that for a centrifugal separator using a small number of separation discs 1 and a large separation gap 2 between the separation discs 1, how to improve the structure of the centrifugal separator so that the flow of the gas-liquid mixture between the separation discs 1 tends to be balanced, thereby increasing the residence time of small droplets of about 1 μm on the separation disc 1, is the key to improving the separation efficiency.

[0050] In the present invention, in order to maintain a separation efficiency comparable to that of an existing centrifugal separator with a high shaft speed, a large number of separation discs 1 and a small separation gap 2 between separation discs 1 while reducing the shaft speed, reducing the number of separation discs 1 and increasing the separation gap 2 between separation discs 1, and without causing the pressure rise to drop too much, the present invention makes a series of improvements to the centrifugal separator.

[0051] Specifically, when the rotation speed of the rotating shaft is reduced, the number of separation discs 1 is reduced, and the separation gaps 2 between the separation discs 1 are increased, when the gas-liquid mixture flows from bottom to top, the gas-liquid mixture tends to flow outward from the separation gaps 2 between the multiple separation discs 1 above under the action of flow inertia, resulting in a large flow of the gas-liquid mixture near the top and a small flow of the gas-liquid mixture between the separation discs 1 near the bottom, thereby causing a flow imbalance phenomenon. In this embodiment, after the gas-liquid mixture enters the stack from the first flow channel 101 of the separation disc 1 at the bottom of the stack, due to the flow inertia along the stack, the gas-liquid mixture flows outward from the separation gaps 2 between the multiple separation discs 1 above. In the stacking direction, from top to bottom, the sum of the cross-sectional areas of the first flow channels 101 of the separation disks 1 tends to increase, thereby forcing a portion of the gas-liquid mixture to enter the separation gap 2 between the separation disks 1 below, which avoids a large amount of gas-liquid mixture from entering the corresponding separation gap 2 through the first flow channels 101 above the stacking body, thereby making the flow of the gas-liquid mixture entering the separation gap 2 above the stacking body and the flow of the gas-liquid mixture entering the separation gap 2 below the stacking body tend to be balanced, which improves the utilization rate of the separation disks 1 below the stacking body, and also improves the separation effect.

[0052] As a further implementation of this embodiment, Figure 3 As shown, a plurality of drainage ribs 3 are arranged at equal or unequal intervals on the inner wall of the separation disk 1, and the drainage ribs 3 extend from the upper end opening of the separation disk 1 to the lower end opening and the thickness gradually increases from top to bottom. The arrangement of this structure gradually reduces the air flow pressure between the separation disks 1, and increases the pressure gradient force of the droplets, so that the pressure from the inlet of the separation gap 2 to the outlet of the separation gap 2 gradually decreases, thereby reducing the circulation speed of the gas-liquid mixture, so that the gas-liquid mixture stays longer in the separation gap 2 between the separation disks 1, and small droplets are more likely to agglomerate into large droplets, thereby improving the separation effect.

[0053] As a further implementation of this embodiment, the drainage rib 3 is arc-shaped, and the bending direction of the drainage rib 3 is consistent with the direction of gas-liquid flow on the separation disc 1 when the separation disc 1 rotates. This structural setting enables the separation disc 1 to rotate, and the gas-liquid mixture will collide with the drainage rib 3 and flow out of the separation gap 2 after entering the separation gap 2 between the two separation discs 1, thereby changing the flow path of the gas-liquid mixture and effectively improving the gas-liquid separation effect.

[0054] The present invention also provides a centrifugal separator, comprising any one of the stacked bodies described above.

[0055] As a further implementation of this embodiment, Figure 1 , such as 4 to Figure 6As shown, the centrifugal separator includes a first pressing plate 4 and a second pressing plate 5 in a hollow truncated cone structure. The first pressing plate 4 is sleeved above the separation disc 1 located at the top of the stack and at least covers the first flow channel 101. The first pressing plate 4 is provided with a second through hole 400 corresponding to the position of the first through hole 100 from top to bottom. The second pressing plate 5 is sleeved below the separation disc 1 at the bottom of the stack. The upper and lower ends of the second pressing plate 5 are provided with communicating openings. The upper end opening of the second pressing plate 5 is provided with a third through hole 500 and a plurality of second flow channels 501 distributed around the third through hole 500. The third through hole 500 and the first through hole 100 are connected to each other. The position of the first flow channel 101 corresponds to the position of the second flow channel 501. The centrifugal separator also includes a shell 9, a rotating shaft 10 and a driving member. The driving member is not shown in the figure. The driving member is used to drive the rotating shaft 10 to rotate. The shell 9 includes an air inlet 11, an exhaust port 12 and a liquid outlet. The liquid outlet is not shown in the figure. The exhaust port 12 is close to the upper end of the shell 9, and the air inlet 11 and the liquid outlet are close to the lower end of the shell 9. The separation discs 1 are stacked on the rotating shaft 10. The rotating shaft 10 is used to drive the first pressing plate 4, the second pressing plate 5 and the plurality of separation discs 1 to rotate so that the gas-liquid mixture entering from the air inlet 11 is 1, gas and liquid are separated under the centrifugal separation action, the separated gas is discharged outwardly through the exhaust port 12, and the separated liquid is discharged outwardly through the liquid outlet hole. At least part of the outer wall of the separation disk 1 is provided with a throttling rib 13, and the throttling effect of the throttling rib 13 of the separation disk 1 near the upper end of the shell 9 on the gas-liquid mixture is greater than the throttling effect of the throttling rib 13 of the separation disk 1 near the lower end of the shell 9 on the gas-liquid mixture. In the prior art, a large amount of gas-liquid mixture flows into the corresponding separation gap 2 through the first flow channel 101 of the separation disk 1 near the upper end of the shell 9, and a small amount of gas-liquid mixture flows into the corresponding separation gap 2 through the first flow channel 101 of the separation disk 1 near the lower end of the shell 9. A flow channel 101 flows into the corresponding separation gap 2, resulting in an unbalanced flow and a poor separation effect. In the present embodiment, in order to give full play to the role of each separation disc 1, the throttling effect of the throttling ribs 13 of the separation disc 1 on the gas-liquid mixture is gradually reduced in the direction from the upper end to the lower end of the outer shell 9. A greater throttling effect means a smaller flow rate of the gas-liquid mixture entering the separation gap 2 between the separation discs 11, and a smaller throttling effect means a smaller flow rate of the gas-liquid mixture entering the separation gap 2 between the separation discs 1. The gradual reduction of the throttling effect further achieves the effect of flow balance.

[0056] As a further implementation of this embodiment, in the direction from the upper end to the lower end of the housing 9, the throttling effect of the throttling ribs 13 of the separation disk 1 on the gas-liquid mixture gradually decreases.

[0057] As a further implementation of this embodiment, Figure 1As shown, the centrifugal separator also includes a spoiler 15, which is respectively arranged in the air inlet 11 and the exhaust port 12. The spoiler 15 is used to collide with the gas-liquid mixture entering the air inlet 11 and the gas-liquid mixture entering the exhaust port 12. The spoiler 15 is detachably arranged in the air inlet 11 and the exhaust port 12. The spoiler 15 forms an acute angle with the flow direction of the airflow. The spoiler 15 arranged at the air inlet 11 can add to the entry of the gas-liquid mixture and can also play a pressurizing role, so that a high pressure rise can be maintained between the air inlet 11 and the exhaust port 12 of the centrifugal separator. At the same time, the spoiler 15 can also collide with the gas-liquid mixture entering the air inlet 11 to achieve the initial separation of the gas-liquid mixture. The spoiler 15 arranged in the exhaust port 12 can collide with the liquid that has not been separated in the gas, thereby improving the separation effect.

[0058] As a further implementation of this embodiment, Figure 7 As shown, the bottom of the housing 9 is also provided with a cyclone 14 having an Archimedean spiral flow. The cyclone 14 is integrated with the bottom of the housing 9 to form the cyclone 14, without the need to separately provide an independent cyclone 14, thereby making full use of the internal structure and space of the housing 9, with a high degree of integration and small space occupancy. The cyclone 14 is connected to the air inlet 11, and after the gas-liquid mixture enters the cyclone 14 through the air inlet 11, a vortex-shaped airflow path is formed. After the liquid is accelerated and separated by the cyclone cavity, some liquid particles with larger mass are separated in the cyclone cavity. , and flows out from the liquid outlet hole in the cyclone 14, and the rest of the gas-liquid mixture enters the interior of the outer shell 9 in a rotating state, and is finally separated by the separation disk 1 and thrown onto the inner wall of the outer shell. The flow channel with an Archimedean spiral structure not only has high separation efficiency, but also can accelerate the flow of airflow and play a better pressurization effect. Under the condition of reducing the rotation speed of the rotating shaft 10, reducing the number of separation disks 1 and increasing the separation gap 2 of the separation disk 1, the pressurization effect of the above structure can maintain a high pressure rise between the exhaust port 12 and the air inlet 11 of the centrifugal separator.

[0059] As a further implementation of this embodiment, Figure 1 and Figure 5 As shown, a sleeve 6 and an annular sleeve 7 located outside the sleeve 6 are coaxially arranged in the upper opening of the second pressing plate 5, and the annular sleeve 7 is formed by extending downward from the inner circumference of the upper opening of the second pressing plate 5. A plurality of radially extending fan blades 8 having a blade inclination angle are evenly distributed on the outer circumference of the sleeve 6. It should be noted that Figure 5The oblique line on the middle blade 8 is not a section line, but is intended to highlight the specific structure and position of the blade 8. The end of the blade 8 away from the sleeve 6 is connected to the inner wall of the annular sleeve 7. The third through hole 500 is formed on the sleeve 6 and extends from the top of the sleeve 6 to the bottom of the sleeve 6. The second flow channel 501 is formed between two adjacent blades 8. The blade 8 is used to disturb and pressurize the gas-liquid mixture flowing through the second flow channel 501 after the second pressure plate 5 rotates.

[0060] Specifically, the driving member drives the rotating shaft 10 to rotate, and the rotation of the rotating shaft 10 drives the first pressure plate 4, the second pressure plate 5 and the separation disk 1 to rotate. When the gas-liquid mixture enters from the air inlet 11, the rotation of the second pressure plate 5 drives the rotation of the fan blades 8. The rotation of the fan blades 8 not only plays the role of pumping the gas-liquid mixture upward, so that the gas-liquid mixture flows upward quickly, but also can turbulent the gas-liquid mixture, so that the gas-liquid mixture flows upward in a spiral, and can also make the fan blades 8 collide with the gas-liquid mixture and separate part of the gas and liquid in advance. The setting of the fan blades 8 increases the collision chance of the gas-liquid mixture and improves the separation efficiency. It also has a certain effect on increasing the pressure of the gas-liquid mixture, which is beneficial to maintain a higher pressure rise between the exhaust port 12 and the air inlet 11 of the centrifugal separator.

[0061] In order to further demonstrate the separation effect of this embodiment, under the condition that other parameters are the same, by changing the intake air flow rate, the centrifugal separator in the prior art (along the stacking direction of the stacked body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation disk 1 is the same) and the separator in this embodiment are compared as follows:

[0062] Intake air flow / LPM 100 150 200 250 300 Separation efficiency of existing technologies 98.6％ 95.5％ 92.7％ 89.7％ 86.4％ The separation efficiency of this example 99.2％ 96.9％ 94.8％ 92％ 89.1％

[0063] Through the comparison of the above data, it can be found that compared with the centrifugal separator in which the sum of the cross-sectional areas of the first flow channels of the separation disks does not have an increasing trend from top to bottom along the stacking direction of the stacking body, the centrifugal separator of this embodiment has better separation efficiency, and when using the centrifugal separator of this embodiment, the smaller the intake air flow rate, the better the separation effect.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A stacked body, characterized in that: It comprises a plurality of separation discs stacked in sequence, wherein each two adjacent separation discs are stacked to form a separation gap for separating a gas-liquid mixture, wherein a first through hole and a plurality of first flow channels surrounding the first through hole are arranged in the upper opening of the separation disc, wherein the first through hole of each separation disc is arranged correspondingly, and the first flow channel on each separation disc is arranged correspondingly, and along the stacking direction of the stacked body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation discs has an increasing trend; The stacking direction of the stack is the gas flow direction, and the direction from top to bottom is opposite to the gas flow direction; From top to bottom, the plurality of separation plates are divided into a plurality of groups of separation plates, the sum of the cross-sectional areas of the first flow channels of the individual separation plates in the lower group of separation plates is greater than the sum of the cross-sectional areas of the first flow channels of the individual separation plates in the upper group of separation plates, the number of separation plates in each group of separation plates is the same or different, and the cross-sectional areas of the first flow channels of the separation plates in each group of separation plates are the same; or, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation plates gradually increases.

2. The stack according to claim 1, characterized in that: The sum of the cross-sectional areas of the first flow channels of the separation disks located at the top of the stack is 1000 mm 2 The sum of the cross-sectional areas of the first flow channels of the separation disks at the bottom of the stack is 1600 mm², and along the stacking direction of the stack, the sum of the cross-sectional areas of the first flow channels increases by 24-30 mm² from top to bottom.

3. The stack according to claim 1, characterized in that: The separation disk is a hollow truncated cone structure, and upper and lower ends of the separation disk are provided with openings that are connected to each other.

4. The stack according to claim 3, characterized in that: A plurality of drainage ribs are arranged on the inner side wall of the separation disk at equal or unequal intervals. The drainage ribs extend from the upper opening of the separation disk to the lower opening and the thickness gradually increases from top to bottom.

5. A centrifugal separator, characterized in that: The invention comprises a stacked body as described in any one of claims 1 to 4.

6. The centrifugal separator according to claim 5, characterized in that The centrifugal separator includes a first pressure plate and a second pressure plate in a hollow truncated cone structure. The first pressure plate is sleeved above the separation disk located at the top of the stacking body and covers at least the first flow channel. A second through hole corresponding to the position of the first through hole is provided on the first pressure plate from top to bottom. The second pressure plate is sleeved below the separation disk at the bottom of the stacking body. Connecting openings are provided at the upper and lower ends of the second pressure plate. A third through hole and a plurality of second flow channels distributed around the third through hole are provided in the upper opening of the second pressure plate. The third through hole corresponds to the position of the first through hole, and the first flow channel corresponds to the position of the second flow channel.

7. The centrifugal separator according to claim 6, characterized in that The centrifugal separator also includes an outer shell and a rotating shaft, the outer shell includes an air inlet, an exhaust port and a liquid outlet, the exhaust port is close to the upper end of the outer shell, the air inlet and the liquid outlet are close to the lower end of the outer shell, the separation discs are stacked on the rotating shaft, the rotating shaft is used to drive the first pressure plate, the second pressure plate and the plurality of separation discs to rotate so that the gas-liquid mixture entering from the air inlet is separated into gas and liquid under the centrifugal separation action of the separation discs, the separated gas is discharged outwardly through the exhaust port, and the separated liquid is discharged outwardly through the liquid outlet, at least part of the outer side walls of the separation discs are provided with throttling ribs, the throttling effect of the throttling ribs of the separation discs close to the upper end of the outer shell on the gas-liquid mixture is greater than the throttling effect of the throttling ribs of the separation discs close to the lower end of the outer shell on the gas-liquid mixture.

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