Vertical centrifugal separator

Abstract

The invention provides a vertical centrifugal separator which comprises a spiral pusher core body and a rotary drum, the spiral pusher core body is located in the rotary drum, and a fixed box body is arranged outside the rotary drum; a spiral blade is arranged on the outer wall of the spiral pusher core and located in a cavity between the spiral pusher core and the rotary drum, a rotary drum liquid outlet is formed in the top of the rotary drum, a rotary drum slag outlet is formed in the side wall of the bottom of the rotary drum, and a slag discharging structure is arranged at the position, close to the rotary drum slag outlet, of the box body. The spiral pusher core body and the rotary drum rotate at different speeds; a rotary drum liquid outlet is formed in the top of the rotary drum, and an air exhaust opening is formed in the top of the box body and used for being connected with an air exhaust device, so that a cavity between the spiral pusher core and the rotary drum is in negative pressure; a box body liquid outlet is formed in the outer wall of the box body and is connected with a liquid outlet pipe; and a liquid rising pipe is arranged at the bottom of the spiral pusher core body and is connected with the expanded cavity. The slurry separation efficiency can be improved, and the water content of discharged slag can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of drilling fluid separation, in particular to a vertical centrifugal separator. Background Art

[0002] The existing drilling fluid solid-liquid separation system is generally composed of 3 vibrating screens + vacuum degasser + desander + desilter + low-speed centrifuge + high-speed centrifuge + several sand pumps. The equipment procurement, maintenance and transportation costs are high, and the space occupied is large, which increases the difficulty of the solid control system. The overall equipment occupies a large area, the automation control is difficult, and the energy consumption is large. The Chinese patent document CN203380009U vertical three-phase combined centrifuge adopts a top liquid inlet structure, which mainly relies on the speed difference between the drum and the spiral pusher to achieve a better solid-liquid separation effect. However, the structure adopts a structure that drives the drum and the spiral pusher to rotate from the top and bottom respectively, which has high requirements for sealing and the bearings are easily damaged. Moreover, it is difficult to accurately control the working conditions by using the top liquid supply method. CN104399601A records a centrifugal separation device, which records a gear box that drives the drum and the spiral pusher to rotate at different speeds. However, in this structure, a pipeline pressure feeding method is adopted, but this method requires the installation of an independent slurry pump, and the drilling fluid containing drill cuttings will soon cause the slurry pump to be damaged. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a vertical centrifugal separator which can be suitable for different working conditions. For example, in some working conditions, it can realize self-priming feeding, can cooperate with a spiral liquid inlet structure to assist feeding, can cooperate with a spiral liquid blocking structure to increase the vacuum degree in the riser to enhance the degassing effect, can improve the durability of the equipment, and can simplify the overall structure and reduce the sealing requirements. The present invention can also facilitate the adaptive adjustment of the processing conditions according to on-site needs.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vertical centrifugal separator, comprising a spiral pusher core and a drum, the spiral pusher core is located in the drum, and a fixed box is provided outside the drum; The spiral pusher core is a hollow structure, the top of the spiral pusher core forms an expanded cavity, the bottom of the expanded cavity is an inverted cone, the top side wall of the expanded cavity is provided with a spiral pusher core discharge port, the outer wall of the spiral pusher core is provided with a spiral blade, the spiral blade is located in the cavity between the spiral pusher core and the drum, the top of the drum is provided with a drum discharge port, the bottom side wall of the drum is provided with a drum slag discharge port, and the box body is provided with a slag discharge structure near the drum slag discharge port; The auger core and the drum rotate at different speeds; A drum discharge port is provided on the top of the drum, and an air suction port is provided on the top of the box body. The air suction port is used to connect an air suction device to make the cavity between the spiral pusher core and the drum negative pressure; A box body drain port is provided on the outer wall of the box body, and the box body drain port is connected to a drain pipe; A liquid riser is provided at the bottom of the core body of the spiral pusher, and the liquid riser is connected with the expansion cavity.

[0005] In a preferred solution, the height of the liquid column of the discharge pipe is greater than the height of the liquid column of the riser pipe.

[0006] In the preferred solution, a differential is provided on the top of the housing; The input structure of the differential is connected to the main drive device, the differential is connected to the screw pusher core through the differential connecting shaft, and the output structure of the differential is connected to the drum, so that the screw pusher core and the drum rotate at different speeds respectively.

[0007] In a preferred solution, a differential is provided on the top of the housing, and the differential is a two-stage planetary gear structure, wherein the first-stage sun gear is meshed and connected with the first-stage planetary gear, and the first-stage planetary gear is meshed and connected with the inner gear of the housing; The primary planet carrier of the primary planetary gear is connected to the secondary sun gear, the secondary sun gear is meshed with the secondary planetary gear, and the secondary planetary gear is meshed with the inner gear of the housing; The differential housing is connected to the main drive device, the bottom of the differential housing is connected to the drum, the secondary planet carrier of the secondary planetary gear is connected to the differential output shaft, and the differential output shaft is connected to the spiral pusher core.

[0008] 5. A vertical centrifugal separator according to claim 4, characterized in that: a differential input shaft fixing bracket is fixedly arranged on the top of the housing, the differential is connected to the differential input shaft fixing bracket through a main bearing, the top of the differential input shaft fixing bracket extends to the top of the differential, and a speed regulating drive device is arranged on the differential input shaft fixing bracket; The primary sun gear is connected to the speed regulating drive device through the second input shaft.

[0009] In a preferred solution, the drum is connected to the liquid discharge pump blades near the liquid discharge port of the box body to assist in liquid discharge.

[0010] In the preferred scheme, an annular liquid collecting trough is provided on the box body near the liquid discharge port of the box body, the liquid discharge port of the box body is located at the outer wall of the annular liquid collecting trough, the top of the drum is connected to the top of the liquid discharge pump blades, there are multiple liquid discharge pump blades, and the liquid discharge pump blades are located in the annular liquid collecting trough.

[0011] In a preferred solution, a box body slag discharge groove is provided at a position of the box body close to the drum slag discharge port, and a horizontally arranged spiral slag discharge device is provided below the box body slag discharge groove.

[0012] In a preferred embodiment, in the spiral slag discharge device, the slag discharge spiral is rotatably located in the slag discharge spiral shell. At a position close to the slag discharge port of the whole machine, the length of the slag discharge spiral is shorter than the horizontal section length (N) of the slag discharge spiral shell, so that a slag discharge congestion section is formed at the slag discharge port of the whole machine.

[0013] In a preferred solution, the outlet of the whole machine slag discharge port of the slag discharge spiral shell is inclined upward to form a slag discharge congestion section at the whole machine slag discharge port.

[0014] In a preferred solution, a rotatable slag conveying pan is provided near the slag discharge port of the rotary drum, and the slag conveying pan is used to convey the slag to the slag discharge trough of the box body.

[0015] In the preferred solution, a slag conveyor pan driving motor is provided on the box body, a slag conveyor pan driving gear is provided in the box body, the slag conveyor pan driving gear is connected to the slag conveyor pan driving motor, a slag conveyor pan driven gear is provided on the slag conveyor pan, the slag conveyor pan driven gear is connected to the slag conveyor pan, and the slag conveyor pan driven gear is meshed and connected to the slag conveyor pan driving gear.

[0016] In a preferred solution, a plurality of permanent magnets are provided on the edge of the slag conveying pan, and a plurality of electromagnets are provided on the outer wall of the box body to drive the slag conveying pan to rotate.

[0017] In a preferred solution, a slag blocking plate is provided at the position of the slag discharge groove of the box body, and the slag blocking plate is used to allow the slag to enter the slag discharge spiral shell.

[0018] In a preferred solution, a spiral lifting device is provided at the bottom of the lifting pipe, the spiral lifting device is provided with an expansion shell, the top of the expansion shell is connected to the lifting pipe, the bottom of the expansion shell is open, and the inner wall of the expansion shell is provided with lifting spiral blades.

[0019] In a preferred embodiment, the lifting spiral blade extends beyond the bottom of the diameter-enlarging shell to form an extended spiral blade.

[0020] In a preferred solution, the box body extends downward to be connected to the riser pipe sleeve, the riser pipe sleeve is sleeved outside the riser pipe, and a dynamic sealing mechanism is provided between the riser pipe sleeve and the riser pipe.

[0021] In a preferred solution, the structure of the dynamic sealing mechanism is as follows: the dynamic sealing upper cover and the dynamic sealing lower cover are fixedly connected to the inner wall of the riser tube sleeve, a groove body is provided between the dynamic sealing upper cover and the dynamic sealing lower cover, the dynamic sealing impeller is fixedly connected to the outer wall of the riser tube, and the dynamic sealing impeller is located in the groove body; The top of the dynamic seal impeller is provided with a raised rib, and the inner top of the dynamic seal lower cover is provided with a raised rib, which is used to limit the unidirectional flow of the liquid.

[0022] In a preferred solution, auxiliary liquid inlet spiral blades are provided on the outer wall of the riser, the bottom of the riser is closed, and a plurality of through holes for liquid inlet are provided on the side wall of the riser above the liquid inlet spiral blades.

[0023] In a preferred solution, a spiral liquid blocking device is provided at the bottom of the riser pipe, and a spiral blade for blocking the incoming liquid is provided on the spiral liquid blocking device to increase the vacuum degree in the riser pipe and improve the degassing effect of the mud.

[0024] The vertical centrifugal separator provided by the present invention has the following beneficial effects by adopting the above structure: 1. The existing drilling fluid solid-liquid separation system can be greatly simplified. With the present invention, one device can complete the work that previously required a vacuum degasser + desander + desilter + low-speed centrifuge and three sand pumps for supplying liquid to these devices, and one less vibrating screen can be used. In this way, one device can replace the previous eight devices, which can greatly reduce energy consumption.

[0025] 2. Stable treatment effect: Compared with the mud separation structure of the cyclone, the mud treatment is not affected by drill cuttings, mud viscosity, pump pressure, and discharge port blockage, and the treatment effect is very stable.

[0026] 3. It can adjust different working states according to the working conditions, such as the self-priming working state, the spiral assisted liquid inlet state, the spiral liquid blocking and degassing state, etc., according to the working conditions, i.e. the mud viscosity, pump pressure, cuttings content and other factors. Especially in the self-priming working state, the negative pressure can better assist the mud exhaust, further improving the efficiency of mud separation. Furthermore, combined with the free stepless adjustment of the absolute speed and relative speed difference between the spiral pusher core and the drum, it can be further adjusted according to the characteristics of different muds, further improving the efficiency of mud separation. In particular, it can significantly reduce the water content of the slag discharge.

[0027] 4. The structure of the present invention has a higher separation efficiency due to the simplified structure and the bottom liquid inlet method. In addition, due to the simplified structure, the drum can achieve a larger diameter and a higher rotation speed, so that the liquid layer is thin and the solid phase particle separation effect in the mud is good. Compared with cyclone separation, the slag water content is lower, and the slag water content can reach less than 20%. Compared with filter press separation, the device of the present invention is easier to operate and maintain, and the operating cost is lower.

[0028] 5. The present invention can reduce the overall purchase cost of the mud separation and treatment system, simplify the solid control system, reduce the floor space of the equipment, and facilitate migration. It can also reduce the total amount of waste mud in the circulating mud, reduce the mud cost and waste treatment cost. It can be conveniently combined with other equipment to realize the recycling resource utilization of sand, gravel and clean water.

[0029] 6. The present invention is conducive to the realization of automation: the types and number of equipment are reduced, the operating performance and working conditions of the equipment are realized by adjusting the speed and displacement, and the vibrating screen does not need to be replaced with screens of different meshes, and remote control and automatic control can be realized, which is conducive to reducing manpower consumption and realizing safe and efficient drilling construction. The speed regulation of the present invention is also very convenient, and the working speed can be adjusted accordingly according to the working conditions.

[0030] 7. Good sealing performance of the equipment: The vertical mud centrifuge of the present invention has fewer sealing points, can achieve closed operation, and has good degassing effect.

[0031] 8. The present invention can simplify the pipeline design of the entire system and eliminate the slurry pump used for liquid supply: the liquid supply method mainly based on self-priming can be realized, and the liquid riser can be inserted into the mud tank without setting up additional liquid supply pipelines and pumps. The cost of sand pumps, as well as the time and labor consumed by maintaining sand pumps, can be saved.

[0032] 9. The optimized auxiliary liquid inlet structure of the present invention can further improve the adaptability to different mud liquid inlets and reduce the vibration during equipment operation.

[0033] 10. The spiral liquid blocking device can improve the vacuum degree during the liquid intake process, promote the separation of bubbles and mud, and improve the mud degassing effect.

[0034] 11. The present invention can improve the mud separation efficiency to 240m 3 / h, the water content of slag can reach 20%, while the water content of silty clay and bentonite slurry can be lower than 40%, which changes the technical route of the solid control system. For example, the cyclone equipment can be eliminated, further improving the mud separation efficiency of the entire solid control system. For another example, due to the low water content of slag, the filter press can be eliminated in the solid control system, which further improves the mud separation efficiency of the entire solid control system. It can also reduce costs and reduce the floor space of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a cross-sectional view of the overall structure of the present invention.

[0036] Figure 2 for Figure 1 AA section view in.

[0037] Figure 3 for Figure 1 BB section view in.

[0038] Figure 4 It is a schematic structural diagram of the differential of the present invention.

[0039] Figure 5 This is a cross-sectional view of the overall structure of another preferred structure of the present invention.

[0040] Figure 6 This is a cross-sectional view of the overall structure of another preferred structure of the present invention.

[0041] Figure 7 This is a cross-sectional view of the overall structure of another preferred structure of the present invention.

[0042] Figure 8 This is a cross-sectional view of the overall structure of another preferred structure of the present invention.

[0043] In the figure: main drive device 1, main motor base 2, main motor pulley 3, transmission belt 4, box seal 5, differential connecting plate 6, main bearing lower seal 7, main bearing 8, differential 9, second input shaft 901, primary sun gear 902, primary planetary gear 903, primary planetary carrier 904, input pulley 905, secondary planetary gear 906, housing inner gear 907, secondary planetary carrier 908, secondary sun gear 909, first output shaft 910, differential output shaft 911, main bearing upper seal 10, main bearing seat 11, differential input shaft fixing bracket 12, differential output shaft 13, box cover 14, drum upper shaft disc 15, liquid discharge pump blade 16, box 17, screw pusher core 18, spiral blade 19, screw pusher small end upper seal 20, screw pusher small end bearing 21, drum 22, slag baffle 23, screw pusher small end lower seal 24, box cover 25, slag discharge spiral shell 26, power seal upper cover 27, power seal impeller 28, power seal lower cover 29, liquid lifting pipe sleeve 30, liquid lifting pipe 31, liquid discharge pipe 32, power seal mounting seat 33, slag conveying plate driving motor 34, slag conveying plate driven gear 35, slag conveying plate driving gear 36, slag conveying plate 37, screw pusher big end bearing 38, screw pusher big end seal 39, slag discharge screw 40, slag discharge screw motor 41, auxiliary liquid inlet spiral blade 42, gap elimination block 43, expansion cavity 44, liquid inlet box 45, speed regulating drive device 46, annular liquid collecting tank 47, screw lifting device 48, expansion diameter shell 481, lifting spiral blade 482, centrifugal baffle 483, cone cap 484, extended spiral blade 485, lower seal 49 of the box, spiral liquid blocking device 50, permanent magnet 51, electromagnet 52, box body drain port C, spiral pusher core body drain port D, drum slag discharge port E, box body slag discharge trough F, whole machine slag discharge port G, liquid outlet H, liquid inlet I, air suction port J, drum drain port K, length of slag discharge spiral M, length of horizontal section N, height of liquid inlet liquid column H1, height of liquid discharge liquid column H2. DETAILED DESCRIPTION

[0044] Embodiment 1: like Figure 1 , 5In ~8, a vertical centrifugal separator includes a screw pusher core 18 and a drum 22, the screw pusher core 18 is located in the drum 22, and a fixed box 17 is provided outside the drum 22; The spiral pusher core 18 is a hollow structure, the top of the spiral pusher core 18 forms an expanded cavity 44, the bottom of the expanded cavity 44 is an inverted cone, the top side wall of the expanded cavity 44 is provided with a spiral pusher core discharge port D, the outer wall of the spiral pusher core 18 is provided with a spiral blade 19, the spiral blade 19 is located in the cavity between the spiral pusher core 18 and the drum 22, the top of the drum 22 is provided with a drum discharge port K, the bottom side wall of the drum 22 is provided with a drum slag discharge port E, and the box 17 is provided with a slag discharge structure near the drum slag discharge port E; The preferred structure is Figure 2 , 3 In the embodiment, the slag discharge structure is a slag discharge structure that discharges slag in a congested and forced manner; preferably, the slag discharge structure is a slag discharge trough. Another preferred structure is as follows Figure 2~3 In the embodiment, the slag discharge structure is a slag discharge structure that discharges slag in a congested and forced manner; A screw pusher big end bearing 38 and a screw pusher small end bearing 21 are provided between the rotary drum 22 and the screw pusher core 18 to achieve relative rotation. A screw pusher small end upper seal 20 and a screw pusher big end seal 39 are also provided.

[0045] The auger core 18 and the drum 22 rotate at different speeds; A drum discharge port K is provided at the top of the drum 22, and an air suction port J is provided at the top of the box body 17. The air suction port J is used to connect an air suction device to make the cavity between the spiral pusher core 18 and the drum 22 negative pressure; A box body drain port C is provided on the outer wall of the box body 17, and the box body drain port C is connected to the drain pipe 32; like Figure 7 In the embodiment, a liquid riser 31 is provided at the bottom of the screw pusher core 18, and the liquid riser 31 is connected to the expansion cavity 44. With this structure, the air suction port J is connected to the negative pressure device to form a negative pressure in the drum 22 and the expansion cavity 44, so that the mud can be sucked from the liquid riser 31 into the expansion cavity 44, and enter the inner cavity of the drum 22 from the liquid discharge port D of the screw pusher core to separate the mud and slag, and assist in exhaust. The gas is discharged from the air suction port J, and the mud supernatant is discharged from the drum liquid discharge port K at the top of the drum 22, and enters the liquid discharge pipe 32 through the box liquid discharge port C, and the slag is discharged from the drum slag discharge port E.

[0046] Embodiment 2: The preferred solution is Figure 1 , 5In Figure 8, the bottom of the drain pipe 32 is lower than or flush with the bottom of the riser pipe 31. Due to this structure, a liquid level difference is formed between the drain pipe 32 and the riser pipe 31, thereby assisting the drainage.

[0047] Or another alternative, such as Figure 1 In the embodiment, the height H2 of the discharge liquid column of the discharge pipe 32 is greater than the height H1 of the inlet liquid column of the riser 31; that is, the height of the discharge pipe 32 from the discharge port C of the box body to the bottom of the discharge pipe 32 is greater than the height from the bottom of the expansion cavity 44 to the bottom of the riser 31.

[0048] Embodiment 3: The preferred solution is Figure 1 In the embodiment, a differential 9 is provided on the top of the housing 17, and the differential 9 is connected to the housing 17 through a main bearing 8; The input structure of the differential 9 is connected to the main drive device 1. Preferably, the main drive device 1 adopts an electric motor or a hydraulic motor, the differential 9 is connected to the screw pusher core 18 through the differential connecting shaft 13, and the output structure of the differential 9 is connected to the drum 22, so that the screw pusher core 18 and the drum 22 rotate at different speeds.

[0049] The preferred solution is Figure 4 In the embodiment, a differential 9 is provided on the top of the housing 17. The differential 9 is a two-stage planetary gear structure. The first-stage sun gear 902 is meshed and connected with the first-stage planetary gear 903. The first-stage planetary gear 903 is meshed and connected with the inner gear 907 of the housing. The primary planet carrier 904 of the primary planet gear 903 is connected to the secondary sun gear 909, the secondary sun gear 909 is meshed and connected to the secondary planet gear 906, and the secondary planet gear 906 is meshed and connected to the inner teeth 907 of the housing; The housing of the differential 9 is connected to the main drive device 1 through a transmission mechanism. Preferably, an input pulley 905 is provided on the outer wall of the housing of the differential 9. The main drive device 1 is connected to the main motor pulley 3. The main motor pulley 3 is connected to the input pulley 905 through a transmission belt 4. The bottom of the housing of the differential 9 is connected to the drum 22 through a housing connection part 910, that is, the drum 22 is directly driven through the housing of the differential 9. The secondary planet carrier 908 of the secondary planetary gear 906 is connected to the differential output shaft 911, and the differential output shaft 911 is connected to the screw pusher core 18. With this structure, more speed control schemes can be realized.

[0050] In the preferred solution, a differential input shaft fixing bracket 12 is fixedly provided on the top of the housing 17, the differential 9 is connected to the differential input shaft fixing bracket 12 through the main bearing 8, the top of the differential input shaft fixing bracket 12 extends to the top of the differential 9, and a speed regulating drive device 46 is provided on the differential input shaft fixing bracket 12; like Figures 5 to 8The primary sun gear 902 is connected to the speed regulating drive device 46 through the second input shaft 901. Preferably, the speed regulating drive device 46 is a speed regulating motor with a reducer, such as a DC permanent magnet motor with a reducer, a stepping motor, etc. The speed regulating drive device 46 drives the second input shaft 901 to rotate forward or reverse at different speeds, so that the speed of the screw pusher core 18 can be conveniently adjusted to achieve the optimal speed adjustment according to the mud state.

[0051] Embodiment 4: The preferred solution is Figure 1 , 5 In the embodiment of the present invention, the drum 22 is connected to the liquid discharge pump blade 16 near the liquid discharge port C of the box body to assist in liquid discharge. As the liquid discharge pump blade 16 rotates, the liquid is discharged from the liquid discharge port C of the box body under the action of centrifugal force.

[0052] The preferred solution is Figure 1 , 5 In Fig. 8, an annular liquid collecting groove 47 is provided on the box body 17 near the box body discharge port C, the box body discharge port C is located at the outer wall of the annular liquid collecting groove 47, the top of the liquid discharge pump blade 16 is connected to the top of the liquid discharge pump blade 16, there are multiple liquid discharge pump blades 16, and the liquid discharge pump blades 16 are located in the annular liquid collecting groove 47. With this structure, the centrifugal force of the liquid discharge pump blades 16 generates negative pressure there, thereby increasing the negative pressure value at the box body discharge port C position, and further improving the solid-liquid separation efficiency.

[0053] Embodiment 5: The preferred solution is Figure 1 , 5 In the embodiment of the present invention, a box body slag discharge groove F is provided at a position of the box body 17 near the drum slag discharge port E, and a horizontally arranged spiral slag discharge device is provided below the box body slag discharge groove F.

[0054] The preferred solution is Figure 2 , 3 In the spiral slag discharge device, the slag discharge spiral 40 is rotatably located in the slag discharge spiral housing 26. At a position close to the slag discharge port G of the whole machine, the length M of the slag discharge spiral is shorter than the horizontal section length (N) of the slag discharge spiral housing 26, so that a slag discharge congestion section is formed at the slag discharge port G of the whole machine. The slag discharge congestion section is used to block the entry of air.

[0055] The preferred solution is Figure 2 , 3 In the embodiment, the outlet of the whole machine slag discharge port G of the slag discharge spiral shell 26 is inclined upward, so that a slag discharge congestion section is formed at the whole machine slag discharge port G.

[0056] The preferred solution is Figure 1 , 3In , 5 to 8, a rotatable slag conveying plate 37 is provided near the drum slag discharge port E, and the rotation of the slag conveying plate 37 is used to scrape the bottom of the inner side of the box body 17 and convey the slag to the box body slag discharge trough F. Preferably, the bottom of the inner side of the box body 17 is an independent part, which is the box body lower cover 25 in this example.

[0057] The preferred solution is Figure 1 , 5 In the embodiment of the invention, a slag conveying pan driving motor 34 is provided on the box body 17, a slag conveying pan driving gear 36 is provided in the box body 17, the slag conveying pan driving gear 36 is connected to the slag conveying pan driving motor 34, a slag conveying pan driven gear 35 is provided inside the box body 17, the slag conveying pan driven gear 35 is connected to the slag conveying pan 37, and the slag conveying pan driven gear 35 is meshed and connected to the slag conveying pan driving gear 36. With this structure, the slag conveying pan 37 is driven to rotate back and forth.

[0058] The preferred solution is Figure 2 , 3 In the embodiment, a slag retaining plate 23 is provided at the position of the slag discharge groove F of the box body, and the slag retaining plate 23 is used to allow the slag to enter the slag discharge spiral shell 26.

[0059] The preferred solution is Figure 7 In the embodiment, a plurality of permanent magnets 51 are provided on the edge of the slag conveying plate 37, and a plurality of electromagnets 52 are provided on the outer wall of the box body 17 to drive the slag conveying plate 37 to rotate. With this structure, the contact driving structure is reduced and the contact driving structure is prevented from being blocked by slag discharge.

[0060] Embodiment 6: The preferred solution is Figure 6 In the embodiment, a spiral lifting device 48 is provided at the bottom of the liquid riser 31, and the spiral lifting device 48 is provided with an expansion shell 481, the top of the expansion shell 481 is connected to the liquid riser 31, the bottom of the expansion shell 481 is open, and the inner wall of the expansion shell 481 is provided with a lifting spiral blade 482. The spiral lifting device 48 is driven to rotate by the liquid riser 31, and the rotation of the spiral blade 482 generates an axial upward thrust to assist in liquid inlet. For some working conditions, without applying a vacuum, this structure can also independently complete the liquid inlet operation.

[0061] The preferred solution is Figure 6 In the embodiment, the lifting spiral blade 482 extends beyond the bottom of the diameter-enlarging housing 481 to form an extended spiral blade 485. With this structure, better liquid inlet is achieved.

[0062] The preferred solution is Figure 6 In the middle of the enlarged diameter housing 481, a cone cap 484 is provided; Further preferred is Figure 6In the embodiment, an annular centrifugal baffle 483 is provided near the diameter expansion housing 481. The centrifugal baffle 483 can block the mud thrown away by the centrifugal force, avoid the formation of vortex at the liquid inlet position, and improve the liquid inlet effect.

[0063] Embodiment 7: The preferred solution is Figure 5 In the embodiment, the box body 17 extends downward to be connected with the riser pipe sleeve 30 , the riser pipe sleeve 30 is sleeved outside the riser pipe 31 , and a dynamic sealing mechanism is provided between the riser pipe sleeve 30 and the riser pipe 31 .

[0064] In the preferred solution, the structure of the dynamic sealing mechanism is as follows: the dynamic sealing upper cover 27 and the dynamic sealing lower cover 29 are fixedly connected to the inner wall of the riser tube sleeve 30, a groove body is provided between the dynamic sealing upper cover 27 and the dynamic sealing lower cover 29, and the dynamic sealing impeller 28 is fixedly connected to the outer wall of the riser tube 31, and the dynamic sealing impeller 28 is located in the groove body. The dynamic sealing impeller 28 of the dynamic sealing mechanism plays a role similar to that of a centrifugal pump blade to achieve one-way sealing, and has a gap, and can adaptively adjust the rotation center. The dynamic sealing mechanism helps to increase the negative pressure value at the position of the suction port J.

[0065] Embodiment 8: The preferred solution is Figure 5 In the embodiment, an auxiliary liquid inlet spiral blade 42 is provided on the outer wall of the liquid riser 31, the bottom of the liquid riser 31 is closed, and a plurality of through holes for liquid inlet are provided on the side wall of the liquid riser 31 above the liquid inlet spiral blade 42. Through the rotation of the liquid riser 31, the liquid inlet spiral blade 42 generates an upward thrust, so that the mud enters the liquid riser 31 from the through holes on the side wall of the liquid riser 31, thereby realizing auxiliary liquid inlet. For some working conditions, without applying vacuum, this structure can also independently complete the liquid inlet operation.

[0066] The preferred solution is Figure 5 In the embodiment, a plurality of gap-eliminating blocks 43 are provided on the outer edge of the auxiliary liquid inlet spiral blade 42, and the gap-eliminating blocks 43 are in contact with the inner wall of the liquid riser sleeve 30. The gap-eliminating blocks 43 are made of polytetrafluoroethylene. The structure of the gap-eliminating blocks 43 can effectively reduce the vibration generated by the rotation of the auxiliary liquid inlet spiral blade 42.

[0067] Embodiment 9: The preferred solution is Figure 8 In the embodiment, a spiral liquid blocking device 50 is provided at the bottom of the liquid rising pipe 31 , and a spiral blade for blocking the inflow of liquid is provided on the spiral liquid blocking device 50 to improve the vacuum degree in the liquid rising pipe 31 .

[0068] The spiral liquid blocking device 50 can adopt the structure of embodiments 6 and 8. It only needs to make the spiral directions of the lifting spiral blade 482 and the liquid inlet spiral blade 42 opposite to each other, and change from auxiliary liquid inlet to auxiliary liquid discharge, to achieve the technical effect. It can be achieved by replacing different spiral liquid blocking devices 50 on site according to the working conditions. When in use, the air suction port J is connected to the water ring vacuum pump, the vacuum degree is about 1Kpa, and the vacuum degree generated by the spiral liquid blocking device 50 is about 0.2Kpa, then the liquid inlet vacuum degree is 1.2Kpa, and a vacuum degree of 1.2Kpa can be generated in the liquid lifting pipe 31, so that the bubbles are more easily separated from the mud, and the degassing effect of the mud is improved.

[0069] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The connections mentioned in the present invention include direct connection and indirect connection. The embodiments in this application and the technical features in the embodiments can be arbitrarily combined with each other to form a new technical solution if they do not conflict with each other. The protection scope of the present invention shall be the technical solution recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solution recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A vertical centrifugal separator, characterized in that: It comprises a spiral pusher core (18) and a rotating drum (22), wherein the spiral pusher core (18) is located inside the rotating drum (22), and a fixed box (17) is provided outside the rotating drum (22); The spiral pusher core (18) is a hollow structure, the top of the spiral pusher core (18) forms an expanded cavity (44), the bottom of the expanded cavity (44) is in an inverted cone shape, the top side wall of the expanded cavity (44) is provided with a spiral pusher core discharge port (D), the outer wall of the spiral pusher core (18) is provided with a spiral blade (19), the spiral blade (19) is located in the cavity between the spiral pusher core (18) and the drum (22), the top of the drum (22) is provided with a drum discharge port (K), the bottom side wall of the drum (22) is provided with a drum slag discharge port (E), and the box (17) is provided with a slag discharge structure near the drum slag discharge port (E); The screw pusher core (18) and the drum (22) rotate at different speeds; A drum discharge port (K) is provided at the top of the drum (22), and an air suction port (J) is provided at the top of the box body (17). The air suction port (J) is used to connect an air suction device so that the cavity between the spiral pusher core (18) and the drum (22) is under negative pressure. A box body liquid discharge port (C) is provided on the outer wall of the box body (17), and the box body liquid discharge port (C) is connected to a liquid discharge pipe (32); A liquid riser (31) is provided at the bottom of the spiral pusher core (18), and the liquid riser (31) is connected to the expansion cavity (44).

2. A vertical centrifugal separator according to claim 1, characterized in that: The height (H2) of the liquid discharge column of the liquid discharge pipe (32) is greater than the height (H1) of the liquid inlet column of the liquid riser (31).

3. A vertical centrifugal separator according to claim 1, characterized in that: A differential (9) is provided on the top of the housing (17); The input structure of the differential (9) is connected to the main drive device (1), the differential (9) is connected to the screw pusher core (18) via a differential connecting shaft (13), and the output structure of the differential (9) is connected to the drum (22), so that the screw pusher core (18) and the drum (22) rotate at different speeds.

4. A vertical centrifugal separator according to claim 1, characterized in that: A differential (9) is provided on the top of the housing (17), the differential (9) being a two-stage planetary gear structure, wherein a first-stage sun gear (902) is meshingly connected with a first-stage planetary gear (903), and the first-stage planetary gear (903) is meshingly connected with a housing inner gear (907); The primary planet carrier (904) of the primary planetary gear (903) is connected to the secondary sun gear (909), the secondary sun gear (909) is meshedly connected to the secondary planetary gear (906), and the secondary planetary gear (906) is meshedly connected to the inner teeth (907) of the housing; The housing of the differential (9) is connected to the main drive device (1), the bottom of the housing of the differential (9) is connected to the drum (22), the secondary planet carrier (908) of the secondary planetary gear (906) is connected to the differential output shaft (911), and the differential output shaft (911) is connected to the screw pusher core (18).

5. A vertical centrifugal separator according to claim 4, characterized in that: A differential input shaft fixing bracket (12) is fixedly provided on the top of the housing (17); the differential (9) is connected to the differential input shaft fixing bracket (12) via a main bearing (8); the top of the differential input shaft fixing bracket (12) extends to the top of the differential (9); and a speed regulating drive device (46) is provided on the differential input shaft fixing bracket (12); The primary sun gear (902) is connected to the speed regulating drive device (46) via the second input shaft (901).

6. A vertical centrifugal separator according to claim 1, characterized in that: Near the liquid discharge port (C) of the casing, the drum (22) is connected to the liquid discharge pump blade (16) to assist in liquid discharge.

7. A vertical centrifugal separator according to claim 6, characterized in that: An annular liquid collecting groove (47) is provided on the box body (17) near the box body liquid discharge port (C). The box body liquid discharge port (C) is located at the outer wall of the annular liquid collecting groove (47). The top of the drum (22) is connected to the top of the liquid discharge pump blade (16). There are a plurality of liquid discharge pump blades (16), and the liquid discharge pump blades (16) are located in the annular liquid collecting groove (47).

8. A vertical centrifugal separator according to claim 1, characterized in that: A box body slag discharge groove (F) is provided at a position of the box body (17) close to the drum slag discharge port (E), and a horizontally arranged spiral slag discharge device is provided below the box body slag discharge groove (F).

9. A vertical centrifugal separator according to claim 8, characterized in that: In the spiral slag discharge device, the slag discharge spiral (40) is rotatably located in the slag discharge spiral shell (26). At a position close to the slag discharge port (G) of the whole machine, the length (M) of the slag discharge spiral is shorter than the horizontal section length (N) of the slag discharge spiral shell (26), so that a slag discharge congestion section is formed at the slag discharge port (G) of the whole machine.

10. A vertical centrifugal separator according to claim 8 or 9, characterized in that: The outlet of the whole machine slag discharge port (G) of the slag discharge spiral shell (26) is inclined upward, so that a slag discharge congestion section is formed at the whole machine slag discharge port (G).

11. A vertical centrifugal separator according to claim 8, characterized in that: A rotatable slag conveying plate (37) is provided near the slag discharge port (E) of the rotary drum, and the slag conveying plate (37) is used to convey the slag to the slag discharge trough (F) of the box body.

12. A vertical centrifugal separator according to claim 11, characterized in that: A slag conveying pan driving motor (34) is provided on the casing (17), a slag conveying pan driving gear (36) is provided in the casing (17), the slag conveying pan driving gear (36) is connected to the slag conveying pan driving motor (34), a slag conveying pan driven gear (35) is provided on the slag conveying pan (37), the slag conveying pan driven gear (35) is connected to the slag conveying pan (37), and the slag conveying pan driven gear (35) is meshingly connected to the slag conveying pan driving gear (36).

13. A vertical centrifugal separator according to claim 11, characterized in that: A plurality of permanent magnets are provided on the edge of the slag conveying plate (37), and a plurality of electromagnets are provided on the outer wall of the box body (17) to drive the slag conveying plate (37) to rotate.

14. A vertical centrifugal separator according to any one of claims 11 to 13, characterized in that: A slag retaining plate (23) is provided at the position of the slag discharge groove (F) of the box body, and the slag retaining plate (23) is used to allow the discharged slag to enter the slag discharge spiral shell (26).

15. A vertical centrifugal separator according to claim 1, characterized in that: A spiral lifting device (48) is provided at the bottom of the liquid lifting pipe (31), and the spiral lifting device (48) is provided with an expansion shell (481). The top of the expansion shell (481) is connected to the liquid lifting pipe (31), the bottom of the expansion shell (481) is open, and the inner wall of the expansion shell (481) is provided with a lifting spiral blade (482).

16. A vertical centrifugal separator according to claim 15, characterized in that: The lifting spiral blade (482) extends beyond the bottom of the diameter-enlarging housing (481) to form an extended spiral blade (485).

17. A vertical centrifugal separator according to claim 1, characterized in that: The box body (17) extends downward to be connected to the riser pipe sleeve (30); the riser pipe sleeve (30) is sleeved outside the riser pipe (31); and a dynamic sealing mechanism is provided between the riser pipe sleeve (30) and the riser pipe (31).

18. A vertical centrifugal separator according to claim 17, characterized in that: The structure of the dynamic sealing mechanism is as follows: a dynamic sealing upper cover (27) and a dynamic sealing lower cover (29) are fixedly connected to the inner wall of a liquid riser sleeve (30); a groove body is provided between the dynamic sealing upper cover (27) and the dynamic sealing lower cover (29); a dynamic sealing impeller (28) is fixedly connected to the outer wall of the liquid riser (31); and the dynamic sealing impeller (28) is located in the groove body; The top of the dynamic seal impeller (28) is provided with a raised rib, and the inner top of the dynamic seal lower cover (29) is provided with a raised rib, which is used to limit the unidirectional flow of the liquid.

19. A vertical centrifugal separator according to claim 17, characterized in that: An auxiliary liquid inlet spiral blade (42) is provided on the outer wall of the liquid riser (31), the bottom of the liquid riser (31) is closed, and a plurality of through holes for liquid inlet are provided on the side wall of the liquid riser (31) above the liquid inlet spiral blade (42).

20. A vertical centrifugal separator according to claim 1, characterized in that: A spiral liquid blocking device (50) is provided at the bottom of the liquid riser (31), and a spiral blade for blocking liquid inflow is provided on the spiral liquid blocking device (50) to increase the vacuum degree in the liquid riser (31) and improve the mud degassing effect.

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