Horizontal screw centrifuge with liquid discharge structure

Abstract

The utility model discloses a horizontal spiral centrifuge with a liquid discharge structure, which comprises a rotary drum, a spiral conveyor, a liquid outlet and a feed pipe, the spiral conveyor is arranged in the rotary drum, a large end cover is arranged in the rotary drum, the side surface of the large end cover is provided with a centripetal pump I connected with a liquid discharge pipe, and the liquid discharge pipe is provided with a valve; the second centripetal pump is connected with a liquid outlet pipe, and the liquid outlet pipe is communicated with the liquid outlet. The centrifugal machine has the advantages that the discharging channel is added, violent vibration caused by unbalance of a liquid ring layer in the shutdown and restart process of a large centrifugal machine is well solved, normal operation of the centrifugal machine is effectively protected, and the special requirement that no residual liquid is left in some rotary drums in the shutdown process can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifuges, and particularly relates to a horizontal spiral centrifuge with a liquid discharging structure. Background Art

[0002] A horizontal spiral discharge sedimentation centrifuge is a high-speed rotating separation device, and its components are composed of a drum and a spiral conveyor. The slurry enters the drum of the centrifuge. Under the action of centrifugal force, a liquid ring layer 8 is formed in the drum. The solid phase with a large density settles at the bottom of the liquid pool (inner wall of the drum) and is conveyed by the spiral conveyor to the small end of the centrifuge for discharge; the liquid phase with a small density is in the middle (close to the axis of rotation of the centrifuge) and overflows from the large end of the drum. When the diameter of the centrifuge is large or the overflow diameter at the large end of the centrifuge is small (the liquid layer is relatively thick), the volume of the liquid ring layer 8 in the drum is larger. When the centrifuge stops, as the rotational speed of the centrifuge continuously decreases and reaches a certain speed (commonly known as: stall state) or below, the annular liquid pool layer in the drum will lose stability, the liquid in the drum is no longer evenly distributed, and imbalance occurs. The larger the volume of the liquid ring layer 8, the greater the imbalance generated. The imbalance of the liquid will cause the centrifuge to generate severe vibration during the shutdown process when it reaches the stall state. Such severe vibration will continue until the speed of the centrifuge further decreases to a very low level (generally only dozens of revolutions per minute);

[0003] On the other hand, since the drum of the centrifuge is in the shape of a column cone, it is impossible to completely drain the liquid after the centrifuge stops. For a centrifuge with a large drum diameter (for example: the diameter is greater than 600 mm), the liquid remaining in the drum will generate imbalance again during the restart of the centrifuge, and it will continue until the rotational speed of the centrifuge reaches a certain speed or above. At this time, the centrifugal force can form a uniformly distributed liquid ring layer 8. During this process, the centrifuge will still generate severe vibration.

[0004] In the prior art, an overflow structure and a centripetal pump structure are generally used for liquid discharge:

[0005] For the horizontal spiral centrifuge with an overflow structure, the depth of the liquid ring layer 8 is adjusted by a baffle. Each adjustment requires the centrifuge to stop. Due to the presence of the liquid ring layer 8, some liquid cannot be completely discharged before shutdown, and there is still a small amount of liquid in the drum after shutdown.

[0006] For the horizontal spiral centrifuge with a centripetal pump structure, it is divided into a non-adjustable centripetal pump and an adjustable centripetal pump. The liquid ring layer 8 of the non-adjustable centripetal pump is a design value, and the liquid ring layer 8 of the adjustable centripetal pump can be adjusted in size through the centripetal pump. Since the adjustable centripetal pump is realized by the eccentric principle, the adjustment range is limited. When the centrifuge stops, part of the liquid ring layer 8 can be discharged through the adjustable centripetal pump, but there is still part of the liquid ring remaining in the drum. There are also industrial separation requirements in special industries that do not allow residual liquid to remain in the drum. Summary of the Utility Model

[0007] To solve the above technical problems, the utility model provides a horizontal screw centrifuge with a liquid discharge structure. By clearing the liquid ring layer in the centrifuge drum before shutdown and eliminating the influence of the liquid in the drum on the centrifuge, the violent vibration of the centrifuge during shutdown and restart can be avoided. At the same time, it can also meet the industrial requirements of special industries.

[0008] Specifically, the utility model discloses a horizontal screw centrifuge with a liquid discharge structure, which includes a drum, a screw conveyor, a liquid outlet and a feed pipe. The screw conveyor is arranged in the drum, and a large end cover is arranged in the drum. On the side of the large end cover, there are:

[0009] Centrifugal pump one, connected with a drain pipe, and a valve is arranged on the drain pipe;

[0010] Centrifugal pump two, connected with a liquid outlet pipe, and the liquid outlet pipe is communicated with the liquid outlet.

[0011] The advantage of adopting the above technical solution is that an additional discharge channel is added, which well solves the violent vibration caused by the imbalance of the liquid ring layer during the shutdown and restart of large centrifuges, effectively protects the normal operation of the centrifuge, and can meet the special requirements that there is no residual liquid left in the drum during shutdown for some drums.

[0012] Further, the centrifugal pump one is provided with a first liquid inlet, the centrifugal pump two is provided with a second liquid inlet, the height of the first liquid inlet is higher than that of the second liquid inlet, and the first liquid inlet is close to the inner wall of the drum.

[0013] The advantage of adopting the above technical solution is that during centrifugation, the liquid phase enters the centrifugal pump two from the second liquid inlet and is discharged through the liquid outlet pipe to complete solid-liquid separation. Before shutdown, the valve is opened, and the residual liquid phase on the inner wall of the drum is discharged through the centrifugal pump one, avoiding the vibration of the centrifuge during shutdown and prolonging the service life of the centrifuge.

[0014] Further, the side of the centrifugal pump two is connected to the centrifugal pump one.

[0015] The advantage of adopting the above technical solution is that the centrifugal pump one can act as a stop block and also serve as the base of the centrifugal pump two, facilitating the overall installation and disassembly.

[0016] Further, the liquid outlet pipe is sleeved outside the feed pipe, a liquid outlet cavity is arranged at the end of the liquid outlet pipe, and the liquid outlet is arranged at the bottom of the liquid outlet cavity.

[0017] The advantage of adopting the above technical solution is that the liquid is discharged from the liquid outlet pipe, the liquid outlet cavity is arranged to collect the liquid to prevent liquid splashing, and the liquid outlet is arranged for the liquid to flow out.

[0018] Further, a small end cover is provided at one end of the drum away from the large end cover, and a slag discharge hole is provided on the side of the drum close to the small end cover.

[0019] The advantage of adopting the above technical solution is that the slag discharge hole is used for discharging slag, so that the separated solid phase is discharged.

[0020] Further, bearings are provided on both sides of the drum, and a differential is provided on the side surface of the small end cover.

[0021] Further, the drain pipe is sleeved outside the liquid outlet pipe, and the valve is an electromagnetic valve.

[0022] The advantage of adopting the above technical solution is that the setting of the electromagnetic valve realizes automatic control of liquid discharge. When liquid discharge is required, the electromagnetic valve opens, and the liquid discharges from the drain pipe. When liquid discharge is not required, the drain pipe closes, and manual adjustment is not needed.

[0023] Further, the number of the first liquid inlet and the second liquid inlet is multiple and they are uniformly arranged on the first centripetal pump and the second centripetal pump.

[0024] The advantage of adopting the above technical solution is that multiple liquid inlets are realized, the centrifugal speed is increased, and the separation effect is ensured.

[0025] Further, both the first centripetal pump and the second centripetal pump are adjustable centripetal pumps.

[0026] The advantage of adopting the above technical solution is that the adjustable centripetal pump can adjust the liquid outlet position and is suitable for different processing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art.

[0028] Figure 1 is a side view structural diagram of a horizontal screw centrifuge with a liquid discharge structure of the present invention

[0029] Figure 2 is a cross-sectional view at position A of the present invention

[0030] Figure 3 is an enlarged view at position B of the present invention

[0031] Among them, the reference numerals involved in the drawings are as follows:

[0032] Drum 1; large end cover 11; small end cover 12; slag discharge hole 13; screw conveyor 2; liquid outlet 3; feed pipe 4; first centripetal pump 5; drain pipe 51; first liquid inlet 52; valve 53; second centripetal pump 6; liquid outlet pipe 61; second liquid inlet 62; liquid outlet cavity 63; differential 7; liquid ring layer 8. Detailed implementation mode

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0034] As Figures 1-3 shown, the present utility model discloses a horizontal screw centrifuge with a liquid discharge structure, which includes a drum 1, a screw conveyor 2, a liquid outlet 3 and a feed pipe 4. The screw conveyor 2 is arranged inside the drum 1, and a housing is arranged outside the drum 1. One end of the feed pipe 4 extends into the screw conveyor 2. A large end cover 11 is arranged inside the drum 1, and the following are arranged on the side of the large end cover 11:

[0035] A first centripetal pump 5, which is connected with a drain pipe, and a valve 53 is arranged on the drain pipe;

[0036] A second centripetal pump 6, which is connected with a liquid outlet pipe 61, and the liquid outlet pipe 61 is communicated with the liquid outlet 3.

[0037] The advantages of adopting the above technical solution are as follows: during the centrifugation process, the first centripetal pump 5 is closed, and the liquid phase is discharged from the second centripetal pump 6. Before shutdown, the valve 53 is opened, and the liquid inside the drum 1 is discharged from the first centripetal pump 5, eliminating the influence of the liquid in the drum 1 on the centrifuge, and avoiding the violent vibration of the centrifuge during shutdown and restart. At the same time, it can also meet the industrial requirements of special industries.

[0038] In some embodiments, the first centripetal pump 5 is provided with a first liquid inlet, the second centripetal pump 6 is provided with a second liquid inlet 62, the height of the first liquid inlet is higher than that of the second liquid inlet 62, and the first liquid inlet is close to the inner wall of the drum 1. During the centrifugation process, a liquid ring layer 8 is formed inside the drum 1. During centrifugation, the liquid phase enters the second centripetal pump 6 from the second liquid inlet 62 and is discharged through the liquid outlet pipe 61 to complete solid-liquid separation. Before shutdown, the valve 53 is opened, and the residual liquid phase on the inner wall of the drum 1 is discharged through the first centripetal pump 5, avoiding the vibration of the centrifuge during shutdown and prolonging the service life of the centrifuge. The solid-phase slag is discharged through the slag outlet.

[0039] Furthermore, the side of the second centripetal pump 6 is connected to the first centripetal pump 5. The first centripetal pump 5 can act as a stop block and also serve as the base of the second centripetal pump 6, facilitating the overall installation and disassembly.

[0040] In some embodiments, the liquid outlet pipe 61 is sleeved outside the feed pipe 4. The end of the liquid outlet pipe 61 is provided with a liquid outlet cavity 63, and the liquid outlet 3 is arranged at the bottom of the liquid outlet cavity 63. The liquid outlet pipe 61 is communicated with the liquid outlet cavity 63. The liquid is discharged from the liquid outlet pipe 61. The liquid outlet cavity 63 is used to collect the liquid to prevent the liquid from splashing, and the liquid outlet 3 is used for the liquid to flow out.

[0041] In some embodiments, a small end cover 12 is provided at one end of the drum 1 away from the large end cover 11, and a slag discharge hole 13 is provided on the side of the drum 1 close to the small end cover 12. The slag discharge hole 13 is provided for discharging slag so that the separated solid phase is discharged.

[0042] Furthermore, bearings are provided on both sides of the drum 1, and a differential 7 is provided on the side surface of the small end cover 12. The differential 7 is connected to a driving motor. The differential 7 enables the drum 1 and the screw conveyor 2 to have different rotational speeds. The screw conveyor 2 conveys the sediment, and the drum 1 provides centrifugal force.

[0043] Furthermore, the drain pipe is sleeved outside the liquid outlet pipe 61, and the valve 53 is a solenoid valve.

[0044] The solenoid valve enables automatic control of liquid discharge. When liquid discharge is required, the solenoid valve opens and the liquid is discharged from the drain pipe. When liquid discharge is not required, the drain pipe is closed without manual adjustment.

[0045] In some embodiments, the number of the first liquid inlet and the second liquid inlets 62 is multiple and they are evenly arranged on the first centripetal pump 5 and the second centripetal pump 6. Both the first centripetal pump 5 and the second centripetal pump 6 are adjustable centripetal pumps. The adjustable centripetal pump can adjust the liquid outlet position to suit different processing conditions.

[0046] During the centrifugation process of this application, the separated liquid phase is discharged through the liquid outlet pipe 61 by the second centripetal pump 6, and the solid slag is transported to the slag discharge port by the screw conveyor 2 for discharge. Before the processing is stopped, the valve 53 is opened and the liquid phase is discharged by the first centripetal pump 5. Since the first centripetal pump 5 is close to the inner wall of the drum 1, the remaining liquid inside the centrifuge is discharged, which well solves the severe vibration caused by the imbalance of the liquid ring layer 8 during the stop and restart processes of the large centrifuge, effectively protects the normal operation of the centrifuge, and can meet the special requirements that there is no residual liquid left inside some drums 1 when stopped.

[0047] For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A horizontal screw centrifuge with a liquid discharge structure, comprising a rotary drum (1), a screw conveyor (2), a liquid outlet (3) and a feed pipe (4), wherein the screw conveyor (2) is arranged in the rotary drum (1), and is characterized in that: A large end cover (11) is arranged inside the rotating drum (1), and the side of the large end cover (11) is provided with: A centripetal pump (5) is connected to a liquid discharge pipe (51), wherein the liquid discharge pipe (51) is provided with a valve (53); The second centripetal pump (6) is connected to a liquid outlet pipe (61), and the liquid outlet pipe (61) is communicated with the liquid outlet (3).

2. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: The centripetal pump 1 (5) is provided with a first liquid inlet (52), and the centripetal pump 2 (6) is provided with a second liquid inlet (62). The first liquid inlet (52) is higher than the second liquid inlet (62), and the first liquid inlet (52) is close to the inner wall of the drum (1).

3. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: The side surface of the centripetal pump 2 (6) is connected to the centripetal pump 1 (5).

4. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: The liquid outlet pipe (61) is sleeved on the outside of the feed pipe (4), a liquid outlet cavity (63) is provided at the end of the liquid outlet pipe (61), and the liquid outlet (3) is provided at the bottom of the liquid outlet cavity (63).

5. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: A small end cover (12) is provided at one end of the rotary drum (1) away from the large end cover (11), and a slag discharge hole (13) is provided at a side of the rotary drum (1) close to the small end cover (12).

6. The horizontal screw centrifuge with a liquid discharge structure according to claim 5, characterized in that: Bearings are arranged on both sides of the rotating drum (1), and a differential (7) is arranged on the side of the small end cover (12).

7. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: The liquid discharge pipe (51) is sleeved on the outside of the liquid outlet pipe (61), and the valve (53) is a solenoid valve.

8. The horizontal screw centrifuge with a liquid discharge structure according to claim 2, characterized in that: The first liquid inlet (52) and the second liquid inlet (62) are both multiple and evenly arranged on the centripetal pump 1 (5) and the centripetal pump 2 (6).

9. The horizontal screw centrifuge with a liquid discharge structure according to claim 1, characterized in that: The centripetal pump 1 (5) and the centripetal pump 2 (6) are both adjustable centripetal pumps.

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