Horizontal screw centrifuge with liquid discharge structure

Abstract

The utility model discloses a horizontal screw centrifuge with a drainage structure, which comprises a rotary drum, a feed pipe and a spiral conveyor, the spiral conveyor is arranged in the rotary drum, a centripetal pump component is mounted in the rotary drum, the horizontal screw centrifuge comprises a pump body, a plurality of pump wheels are arranged on the pump body, the pump wheels are provided with suction ports, and the suction ports are communicated with the feed pipe. The pump wheel is rotatably connected with the pump body through a wheel shaft; and the driving assembly drives the pump wheel to rotate and is used for changing the position of the suction port in the rotary drum. The centripetal pump has the advantages that by arranging the rotatable pump wheel, the requirement for large-flow liquid drainage of a large-specification centrifugal machine is met, the pump body of the centripetal pump is stressed in a balanced mode, the reliability and stability of the centrifugal machine can be greatly improved, and the adjusting precision of the depth of a liquid pool of the centrifugal machine can also be improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge technology, specifically to a horizontal screw centrifuge with a drainage structure. Background Technology

[0002] The main drainage methods for horizontal screw centrifuges are overflow and pressure discharge.

[0003] Overflow type Figure 6 The separated liquid overflows from the overflow port at the large end of the drum, is collected inside the casing, and then flows out of the centrifuge.

[0004] Pressure relief type, see Figure 7 As shown, except for the liquid discharge method, the other structures of the centrifuge are the same. Figure 6 The separated liquid was subjected to... Figure 2 The centrifugal pump shown directly pumps the liquid out of the centrifuge, and the liquid is discharged under pressure. In a typical centrifugal pump structure, the pump itself is a stationary component. When the pump impeller's suction port cuts into the high-speed rotating liquid layer inside the drum, the liquid, relying on the drum's kinetic energy, is forced into the pump body and transported out. Common centrifugal pump structures include fixed and adjustable types. In a fixed centrifugal pump, the pump impeller has multiple suction ports with a constant diameter, and the liquid level (or liquid pool depth) inside the centrifuge drum is not adjustable. In an adjustable centrifugal pump, the pump impeller typically has a single suction port. The pump impeller has an eccentric mechanism; by rotating the pump impeller's angle, the outer diameter of the impeller can be adjusted, thereby regulating the liquid pool depth in the centrifuge.

[0005] Both types of centrifugal pumps have certain drawbacks. Fixed centrifugal pumps can be made with multiple suction ports, resulting in a sufficiently large discharge capacity, but they cannot dynamically adjust the liquid pool depth unless the pump impeller size is changed. Adjustable centrifugal pumps, because their pump impeller has a single suction port, have limited discharge capacity and are only suitable for small to medium-sized centrifuges (e.g., single-unit processing capacity less than 20 m³ / h). Furthermore, because the pump impeller has a single suction port, the force on the pump body is uneven. The pump impeller cutting into the liquid layer is impacted by the high-speed rotating liquid, causing severe vibration of the pump body, and the feed pipe assembled with the centrifugal pump is easily broken by the vibration. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a horizontal screw centrifuge with a drainage structure, which meets the high-flow drainage requirements of large-scale centrifuges. The centrifugal pump body is subjected to balanced forces, which can greatly improve the reliability and stability of the centrifuge and also improve the adjustment accuracy of the centrifuge liquid pool depth.

[0007] Specifically, this utility model discloses a horizontal screw centrifuge with a drainage structure, comprising: a rotating drum, a feed pipe, and a screw conveyor. The screw conveyor is disposed inside the rotating drum, and a centripetal pump assembly is installed inside the rotating drum, comprising:

[0008] A pump body, on which multiple pump wheels are provided, each pump wheel being provided with a suction port, and the pump wheels being rotatably connected to the pump body via axles;

[0009] A drive assembly drives the pump wheel to rotate, thereby changing the position of the suction port within the drum.

[0010] The advantages of adopting the above technical solution are that by setting a rotatable pump wheel, the high flow rate of liquid discharge of large-scale centrifuges can be met, the pump body is subjected to balanced force, which can greatly improve the reliability and stability of the centrifuge, and also improve the adjustment accuracy of the liquid pool depth of the centrifuge.

[0011] Furthermore, the pump wheel is provided with an inlet channel, and the pump body is provided with a discharge chamber. One end of the inlet channel is connected to the suction port, and the other end is connected to the discharge chamber.

[0012] The advantage of adopting the above technical solution is that, during the drainage process, the liquid enters through the suction port, enters the pump body through the drainage channel, and is then discharged. The setting of multiple pump impellers meets the usage requirements of large-capacity centrifuges.

[0013] Furthermore, the liquid inlet channel is arc-shaped.

[0014] The advantage of adopting the above technical solution is that the arc-shaped drainage channel facilitates the flow of liquid in the inlet channel and facilitates liquid discharge.

[0015] Furthermore, the drive assembly includes a pinion and a large gear. The pinion is fixedly connected to the axle, and the large gear is fixedly connected to the feed pipe. The large gear drives the pinion to rotate, which in turn drives the pump wheel to rotate.

[0016] The advantage of adopting the above technical solution is that by driving the small gear to rotate through the large gear, the relative height of the pump impeller suction port can be changed, thereby adjusting the depth of the liquid pool.

[0017] Furthermore, a drainage channel is provided between the pump body and the feed pipe, and the drainage channel is connected to an outlet.

[0018] The advantage of adopting the above technical solution is that the drainage channel is designed for the liquid to flow out, and the liquid can flow out from the outlet.

[0019] Furthermore, the drum is equipped with a large end cover and a small end cover at both ends, the centripetal pump assembly is installed at the large end cover, and a slag outlet is provided at the small end cover.

[0020] The advantage of adopting the above technical solution is that the slag outlet is set for slag discharge, and the large end cap is used for liquid discharge, thereby realizing the separation of liquid and solid.

[0021] Furthermore, the number of pump wheels is two or more.

[0022] Furthermore, the inner diameter of the liquid inlet channel gradually increases near the feed pipe.

[0023] Furthermore, the pump wheel has a circular cross-section with an arc-shaped transition surface on the upper side.

[0024] The advantage of adopting the above technical solution is that the arc-shaped transition surface reduces the overall volume of the pump impeller and reduces the resistance it experiences.

[0025] Furthermore, the driving device also includes a driving component for driving the feed tube to rotate.

[0026] The advantage of adopting the above technical solution is that by setting a rotating feed pipe, it is convenient to drive the pump wheel to rotate, which is used to change the depth of the liquid pool. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0028] Figure 1 This is a schematic diagram of the overall structure of the horizontal screw centrifuge with a drainage structure according to this utility model;

[0029] Figure 2 This is a structural diagram of the feed pipe and pump body of this utility model.

[0030] Figure 3 This is a cross-sectional view of the pump body of this utility model.

[0031] Figure 4 This is a diagram showing the pump wheel position at the minimum liquid pool depth of this utility model.

[0032] Figure 5 This is a diagram showing the pump wheel position at the maximum liquid pool depth of this utility model.

[0033] Figure 6 This is a structural diagram of an overflow centrifuge in the existing technology.

[0034] Figure 7 This is a structural diagram of a centrifuge with a centrifugal pump installed in the prior art.

[0035] The reference numerals used in the attached figures are as follows:

[0036] 1. Rotary drum; 11. Large end cover; 12. Small end cover; 13. Slag outlet; 2. Feed pipe; 3. Screw conveyor; 4. Pump body; 41. Drainage chamber; 42. Drainage channel; 43. Outlet; 5. Pump wheel; 51. Suction port; 52. Inlet flow channel; 53. Arc transition surface; 6. Axle; 7. Small gear; 71. Large gear. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings.

[0038] like Figure 1-5 As shown, this utility model discloses a horizontal screw centrifuge with a drainage structure, including: a rotating drum 1, a feed pipe 2, and a screw conveyor 3. The screw conveyor 3 is disposed inside the rotating drum 1, and a centripetal pump assembly is installed inside the rotating drum 1, including:

[0039] Pump body 4, on which multiple pump wheels 5 are provided, each pump wheel 5 is provided with a suction port 51, and the pump wheel 5 is rotatably connected to the pump body 4 via a wheel axle 6; the number of pump wheels 5 is two or more.

[0040] The drive assembly drives the pump wheel 5 to rotate, thereby changing the position of the suction port 51 within the drum 1.

[0041] The advantages of adopting the above technical solution are that by setting a rotatable pump wheel 5, the large flow rate of liquid discharge of large-scale centrifuges can be met, the pump body is subjected to balanced force, which can greatly improve the reliability and stability of the centrifuge, and also improve the adjustment accuracy of the liquid pool depth of the centrifuge.

[0042] Furthermore, the pump impeller 5 is equipped with an inlet channel 52, and the pump body 4 is equipped with a discharge chamber 41. One end of the inlet channel 52 is connected to the suction port 51, and the other end is connected to the discharge chamber 41. A support frame is provided at one end of the horizontal screw centrifuge, and the pump body 4 is fixedly connected to the support frame. The pump body 4 does not rotate during the operation of the centrifuge. During the discharge process, liquid enters through the suction port 51, enters the pump body 4 through the discharge channel 42, and is then discharged. The arrangement of multiple pump impellers 5 meets the usage requirements of high-capacity centrifuges.

[0043] The pump wheel 5 has a circular cross-section and an arc-shaped transition surface 53 on its upper side.

[0044] Furthermore, the liquid inlet channel 52 is arc-shaped, with its inner diameter gradually increasing along the direction close to the feed pipe 2, ensuring that the liquid can enter quickly.

[0045] Furthermore, the drive assembly includes a small gear 7 and a large gear 71. The small gear 7 is fixedly connected to the axle 6, and the large gear 71 is fixedly connected to the feed pipe 2. The large gear 71 drives the small gear 7 to rotate. The axle 6 passes through the pump body 4 and is rotatably fixed. The pump body 4 is provided with multiple clearance grooves for avoiding the pump wheel 5. The pump wheel 5 is fixedly connected to the axle 6. The connection between the pump wheel 5 and the axle 6 can be made by interference fit or other methods. The small gear 7 is fixedly connected to the axle 6, which can be fixed by welding or other methods. The small gear 7 is located on the side of the pump body 4, with a gap between it and the pump body 4. The large gear 71 meshes with the small gear 7. The large gear 71 drives the small gear 7 to rotate, changing the position of the suction port 51 and realizing the adjustment of the liquid pool depth.

[0046] In some implementations, a drain channel 42 is provided between the pump body 4 and the feed pipe 2, and the drain channel 42 is connected to an outlet 43.

[0047] Furthermore, large end caps 11 and small end caps 12 are fixedly installed at both ends of the drum 1. The centripetal pump assembly is installed at the large end cap 11, the pump body 4 is located inside the drum 1, and a slag outlet 13 is provided at the small end cap 12. At the same time, an outer shell is provided on the outside of the drum 1 to provide protection.

[0048] Furthermore, the drive device also includes a drive component for driving the feed pipe 2 to rotate. The drive component can be an electric drive device, i.e., a motor, or a manual device. At one end of the outer side of the feed pipe 2, there is a manual or electric drive device that can drive the feed pipe 2 to rotate around the stationary pump body axis. In order to realize the rotation function of the feed pipe 2, the feed pipe 2 also has bearings and other components that facilitate rotation during installation.

[0049] During operation, the raw slurry enters the hollow shaft of the screw conveyor 3 of the centrifuge through the feed inlet and feed pipe 2. Several distribution ports are then opened on the hollow shaft of the screw, through which the raw slurry enters the rotating drum 1. Under the action of centrifugal force, centrifugal sedimentation separation is achieved, resulting in the separation of the liquid phase and solid slag into layers. The liquid phase is in the middle layer, and the solid slag is in the outermost layer and adheres to the inner wall of the rotating drum 1. The separated liquid phase flows to the large end of the rotating drum 1 and is discharged from the liquid outlet 43. The solid slag is conveyed by the screw conveyor 3 to the small end of the rotating drum 1 and discharged from the slag discharge port. After being collected in the solid slag collection chamber, it is discharged from the machine through the slag hopper.

[0050] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A horizontal screw centrifuge with a drainage structure, comprising: A rotating drum (1), a feed pipe (2), and a screw conveyor (3), wherein the screw conveyor (3) is disposed inside the rotating drum (1), characterized in that a centripetal pump assembly is installed inside the rotating drum (1), comprising: Pump body (4), on which multiple pump wheels (5) are provided, each pump wheel (5) is provided with a suction port (51), and the pump wheel (5) is rotatably connected to the pump body (4) via a wheel axle (6); The drive assembly drives the pump wheel (5) to rotate, thereby changing the position of the suction port (51) within the drum (1).

2. The horizontal screw centrifuge with a drainage structure according to claim 1, characterized in that, The pump wheel (5) is provided with an inlet channel (52), and the pump body (4) is provided with a drain chamber (41). One end of the inlet channel (52) is connected to the suction port (51), and the other end is connected to the drain chamber (41).

3. The horizontal screw centrifuge with a drainage structure according to claim 2, characterized in that, The liquid inlet channel (52) is arc-shaped.

4. The horizontal screw centrifuge with a drainage structure according to claim 1, characterized in that, The drive assembly includes a small gear (7) and a large gear (71). The small gear (7) is fixedly connected to the axle (6), and the large gear (71) is fixedly connected to the feed pipe (2). The large gear (71) drives the small gear (7) to rotate, which in turn drives the pump wheel (5) to rotate.

5. The horizontal screw centrifuge with a drainage structure according to claim 1, characterized in that, A drain channel (42) is provided between the pump body (4) and the feed pipe (2), and the drain channel (42) is connected to the outlet (43).

6. The horizontal screw centrifuge with a drainage structure according to claim 5, characterized in that, The drum (1) is equipped with a large end cover (11) and a small end cover (12) at both ends. The centripetal pump assembly is installed at the large end cover (11), and a slag outlet (13) is provided at the small end cover (12).

7. The horizontal screw centrifuge with a drainage structure according to claim 1, characterized in that, The number of pump wheels (5) is two or more.

8. The horizontal screw centrifuge with a drainage structure according to claim 2, characterized in that, The inner diameter of the liquid inlet channel (52) gradually increases as it approaches the feed pipe (2).

9. The horizontal screw centrifuge with a drainage structure according to claim 1, characterized in that, The pump wheel (5) has a circular cross-section and an arc-shaped transition surface (53) on the upper side.

10. The horizontal screw centrifuge with a drainage structure according to claim 4, characterized in that, The driving device also includes a driving component for driving the feed tube (2) to rotate.

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