A horizontal screw centrifuge and a method for preventing liquid from being turned over in a horizontal screw centrifuge feed bin

Abstract

The present application relates to the field of decanter centrifuge, and discloses a decanter centrifuge and a method for preventing liquid from flowing backward in a material distribution bin of the decanter centrifuge. A spiral annular plate is arranged in a transition section spiral cylinder of the decanter centrifuge, the spiral direction of the spiral annular plate is opposite to that of the main machine, a spiral annular channel is formed between the spiral annular plate and the cylinder wall, liquid phase entering the annular channel changes the flow direction through the spiral thrust, so that the effect of inhibiting the backflow of the liquid phase is achieved. The present application can solve the problem that liquid phase flows backward to the end bearing during the gradual stopping process of the existing decanter centrifuge, which affects the normal operation of the centrifuge and damages the sealing element.

Description

Technical Field

[0001] This invention relates to the field of horizontal screw centrifuges, and more specifically to a horizontal screw centrifuge and a method for using an anti-tipping liquid in the feed hopper of a horizontal screw centrifuge. Background Technology

[0002] In a horizontal screw centrifuge, the section between the spiral feed hopper and the end bearing mounting position is a transition spiral cylinder. Currently, for the feed jacket cleaning water and feed hopper backflow liquid entering it, the backflow of liquid to the bearing end is usually suppressed by the tapered shape of the transition cylinder itself through liquid throwing and lifting of the bearing end mounting position.

[0003] The drawback of this technology is that when the centrifuge is rotating normally, the liquid phase does not flow towards the bearing end due to centrifugal force and the force component of the drum cone angle. However, when the centrifuge stops, the centrifugal force decreases as the centrifuge gradually stops and the rotation speed decreases, causing the liquid phase adhering to the drum wall to "collapse," and the accumulated liquid can easily backflow towards the bearing end. When the separated material is a certain special material, the backflow of its mother liquor not only affects the normal operation of the centrifuge but can also contaminate and damage the seals. Summary of the Invention

[0004] The present invention aims to provide a horizontal screw centrifuge and a method for preventing liquid backflow in the feed bin of the horizontal screw centrifuge, so as to solve the problem that the liquid phase will backflow into the end bearing during the gradual shutdown process of the existing horizontal screw centrifuge, affecting the normal operation of the centrifuge and damaging the seals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a horizontal screw centrifuge, comprising a screw cylinder, a feeding bin inside the screw cylinder, a feeding hopper inside the feeding bin, a jacketed feed pipe installed at the end of the screw cylinder via a bearing, the end of the jacketed feed pipe extending into the feeding hopper, a spiral annular plate connected to the screw cylinder between the feeding hopper and the bearing mounting position, the spiral annular plate being sleeved on the jacketed feed pipe, and a spiral channel being formed between the spiral annular plate and the inner wall of the screw cylinder.

[0006] Preferably, as an improvement, a drainage hole is provided on the side wall of the fabric bin at the base of the fabric hopper.

[0007] Preferably, as an improvement, the rotation direction of the spiral annular plate is opposite to the rotation direction of the spiral blades on the spiral cylinder.

[0008] Preferably, as an improvement, the spiral cylinder between the feed hopper and the bearing mounting position is a conical cylinder, and the spiral annular plate is conical.

[0009] Preferably, as an improvement, a bearing seal is installed on the side of the bearing mounting location near the spiral annular plate.

[0010] A method for preventing tipping of the feed hopper in a horizontal decanter centrifuge, applicable to the horizontal decanter centrifuge described above, includes:

[0011] A spiral annular plate is fixed inside the transition section spiral cylinder of the horizontal screw centrifuge, forming a spiral channel between the spiral annular plate and the transition section spiral cylinder. Drainage holes are opened on the spiral cylinder at the root of the feeding hopper.

[0012] When the horizontal screw centrifuge is working, the spiral annular plate blocks the axial flow of liquid phase inside the transition section of the spiral cylinder;

[0013] When the horizontal screw centrifuge stops, the spiral annular plate blocks the backflow of mother liquor.

[0014] Preferably, as an improvement, the rotation direction of the spiral annular plate is set to be opposite to the rotation direction of the spiral blades on the spiral cylinder. When the horizontal screw centrifuge stops, the cleaning water is pushed into the cloth hopper by the spiral annular plate in the spiral channel and discharged from the drain hole, thus blocking the backflow of mother liquor.

[0015] Preferably, as an improvement, the rotation direction of the spiral annular plate is set to be opposite to the rotation direction of the spiral blades on the spiral cylinder. When the horizontal screw centrifuge stops, the spiral annular plate pushes the backflowed mother liquor to the feed hopper and discharges it from the drain hole, thus blocking the backflow of mother liquor.

[0016] The principle and advantages of this invention are as follows: In practical application, the spiral cylinder between the feeding hopper and the bearing mounting position is a transition section spiral cylinder. When there is no liquid overflow protection device, the flow path and method of the liquid phase towards the bearing end are as follows: ① The mother liquor of the material entering the feeding hopper through the jacketed feed pipe overflows the feeding hopper pipe opening and flows back into the inner cavity of the transition section spiral cylinder; ② The feed cleaning water is discharged into the inner cavity of the transition section spiral cylinder through the jacket cavity of the feed pipe. The above two streams of accumulated liquid are very likely to impregnate the bearing seal. This solution involves adding a spiral annular plate to the outside of the jacketed feed pipe of the spiral cylinder in the transition section. A spiral channel is formed between the spiral annular plate and the inner wall of the spiral cylinder. The spiral annular plate provides some obstruction to the axially flowing liquid phase. During the shutdown process of the horizontal screw centrifuge, the centrifuge gradually stops rotating from high speed. During this gradual stopping, because the spiral cylinder still maintains a certain rotational speed, the cleaning water flows along the spiral channel towards the distribution hopper under the action of the spiral thrust. The mother liquor backflowing in section ① needs to impregnate the bearing end, and can only pass through the spiral annular channel. However, the spiral thrust in the opposite direction hinders its flow, and the cleaning water flowing to the left in the annular channel also provides some obstruction to the backflowing mother liquor. Through these methods, the two streams of accumulated liquid, ① and ②, which could potentially cause backflow, are redirected and discharged to the foot of the distribution hopper, then discharged from the spiral cylinder through the drain hole. This effectively prevents the liquid phase from backflowing towards the end bearing, affecting the normal operation of the centrifuge and damaging the seals. The horizontal screw centrifuge with this structure and anti-backflow method can effectively avoid damage to the bearings and bearing seals caused by mother liquor backflow, and can carry out material separation and processing stably and reliably for a long time.

[0017] The advantages of this solution include:

[0018] 1. Through the triple action of the spiral annular channel to block the liquid phase of backflow, the reverse spiral thrust, and the blocking of cleaning water, the liquid backflow phenomenon is effectively suppressed when the machine is shut down.

[0019] 2. Easy to install and highly interchangeable. No need to adjust the original structure and size of the centrifuge. Simply add a spiral ring plate to the original welding process.

[0020] 3. The structure is simple, consisting of a spiral ring plate, requiring no complex assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings of the instruction manual include: 1. Fabric bin, 2. Spiral annular plate, 3. Spiral cylinder, 4. Spiral channel, 5. Feed pipe, 6. Bearing seal, 7. Fabric hopper, 8. Drainage hole.

[0024] Example 1, basically as shown in the attached document. Figure 1 The centrifuge includes a spiral cylinder 3, a feeding bin 1, and a feeding hopper 7. A drainage hole 8 is provided on the side wall of the feeding bin 1 at the base of the feeding hopper 7. A jacketed feed pipe 5 is mounted on the end of the spiral cylinder 3 via a bearing. A bearing seal 6 is installed on the side of the bearing mounting position near the spiral annular plate. The end of the jacketed feed pipe 5 extends into the feeding hopper 7. A spiral annular plate 2 is welded onto the spiral cylinder 3 between the feeding hopper 7 and the bearing mounting position. The spiral cylinder 3 between the feeding hopper 7 and the bearing mounting position is conical, and the spiral annular plate 2 is conical. The spiral annular plate 2 is fitted onto the jacketed feed pipe 5, forming a spiral channel 4 between the spiral annular plate 2 and the inner wall of the spiral cylinder 3. The rotation direction of the spiral annular plate 2 is opposite to the rotation direction of the spiral blades on the spiral cylinder 3. When the spiral cylinder 3 is working, the spiral annular plate 2 pushes the liquid phase in the spiral channel 4 towards the feeding hopper 7.

[0025] Example 2, a method for preventing tipping liquid in the feed hopper of a horizontal decanter centrifuge, applicable to a horizontal decanter centrifuge of Example 1, comprising:

[0026] A spiral annular plate 2 is welded and fixed inside the transition section spiral cylinder 3 of the horizontal screw centrifuge. The rotation direction of the spiral annular plate 2 is set to be opposite to the rotation direction of the spiral blades on the spiral cylinder 3. A spiral channel 4 is formed between the spiral annular plate 2 and the transition section spiral cylinder 3. A drainage hole 8 is opened on the spiral cylinder 3 at the root of the feeding hopper 7.

[0027] When the horizontal screw centrifuge is working, the spiral annular plate 2 blocks the axially flowing liquid phase inside the transition section spiral cylinder 3;

[0028] When the horizontal screw centrifuge stops, the spiral channel 4 and the spiral annular plate 2 push the cleaning water and the backflow mother liquor into the cloth hopper 7 and discharge it from the drain hole 8, thus blocking the backflow mother liquor.

[0029] When there is no backflow protection device, the flow path and manner of the liquid phase towards the bearing end are as follows: ① The mother liquor of the material entering the spiral feed hopper 1 through the feed pipe 5 backflows through the feed hopper 7 into the inner cavity of the transition section spiral cylinder 3. ② The feed cleaning water is discharged into the inner cavity of the transition section spiral cylinder 3 through the jacket cavity of the feed pipe 5. The above two streams of accumulated liquid are very likely to impregnate the bearing seal 6 to the right.

[0030] After adding the spiral annular plate 2 as a protection device for liquid overflow in the fabric hopper, the spiral annular plate 2 firstly provides a certain degree of obstruction to the axial flow of the liquid phase; in step ②, the cleaning water is first discharged to the spiral channel 4. When the machine stops, the centrifuge gradually stops rotating from high speed. During the gradual stopping process, since the spiral cylinder still has a certain rotation speed, the cleaning water flows along the spiral channel in the direction of the fabric hopper 7 (to the left in the diagram) under the action of the spiral thrust; the mother liquor that is backflowed in step ① needs to impregnate towards the bearing end, and can only pass through the spiral annular channel. The spiral thrust in the opposite direction will hinder its flow, and at the same time, the cleaning water flowing to the left in the annular channel will also block the backflow of mother liquor to a certain extent. Through the above methods, the two streams of liquid that may have caused overflow in steps ① and ② are changed in flow direction and discharged to the foot of the fabric hopper 7, and discharged from the spiral cylinder through the drain hole 8.

[0031] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A horizontal decanter centrifuge, characterized in that: It includes a spiral cylinder, a material distribution bin inside the spiral cylinder, a material distribution hopper inside the material distribution bin, a jacketed feed pipe installed at the end of the spiral cylinder via a bearing, the end of the jacketed feed pipe extending into the material distribution hopper, a spiral annular plate connected to the spiral cylinder between the material distribution hopper and the bearing mounting position, the spiral annular plate being sleeved on the jacketed feed pipe, and a spiral channel being formed between the spiral annular plate and the inner wall of the spiral cylinder. Drainage holes are provided on the side wall of the fabric bin at the base of the fabric hopper; The direction of rotation of the spiral annular plate is opposite to the direction of rotation of the spiral blades on the spiral cylinder; The spiral cylinder between the fabric hopper and the bearing mounting position is a conical cylinder, and the spiral annular plate is conical.

2. A horizontal decanter centrifuge according to claim 1, characterized in that: A bearing seal is installed on the side of the bearing mounting position near the spiral annular plate.

3. A method for preventing tipping of the feed hopper in a horizontal decanter centrifuge, applicable to a horizontal decanter centrifuge as described in any one of claims 1-2, characterized in that: A spiral annular plate is fixed inside the transition section spiral cylinder of the horizontal screw centrifuge, forming a spiral channel between the spiral annular plate and the transition section spiral cylinder. Drainage holes are opened on the spiral cylinder at the root of the feeding hopper. When the horizontal screw centrifuge is working, the spiral annular plate blocks the axial flow of liquid phase inside the transition section of the spiral cylinder; When the horizontal screw centrifuge stops, the spiral annular plate blocks the backflow of mother liquor.

4. The method for preventing tipping of the feed hopper in a horizontal screw centrifuge according to claim 3, characterized in that: The rotation direction of the spiral annular plate is set to be opposite to the rotation direction of the spiral blades on the spiral cylinder. When the horizontal screw centrifuge stops, the cleaning water is pushed into the cloth hopper by the spiral annular plate in the spiral channel and discharged from the drain hole, thus blocking the backflow of mother liquor.

5. The method for providing anti-tipping liquid in the feed bin of a horizontal screw centrifuge according to claim 3, characterized in that: The rotation direction of the spiral annular plate is set to be opposite to the rotation direction of the spiral blades on the spiral cylinder. When the horizontal screw centrifuge stops, the spiral annular plate pushes the backflowed mother liquor into the feed hopper and discharges it from the drain hole, thus blocking the backflow of mother liquor.

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