Liquid turning protection device for shutdown material distribution bin of horizontal screw centrifuge
By adding a spiral annular plate outside the spiral cylinder of the transition section of the spiral centrifuge, a spiral channel is formed, and the liquid phase flow direction is changed by blocking the spiral thrust and cleaning water, which solves the problem of liquid opposite irrigation during the gradual stop of the spiral centrifuge, and effectively promotes liquid turning to ensure the normal operation of the centrifuge and the protection of seals.
Patent Information
- Application Number
- CN202421486041.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-26
AI Technical Summary
During the gradual stopping process of the horizontal screw centrifuge, the liquid phase is easily reversed to the bearing end, affecting the normal operation of the centrifuge and damaging the seal.
A spiral annular plate is added to the outside of the jacketed feed pipe of the spiral cylinder in the transition section of the spiral centrifuge to form a spiral channel. The blocking effect of spiral thrust and cleaning water is used to change the flow direction of the liquid phase and prevent it from pouring back to the bearing end.
It effectively suppresses the liquid turnover phenomenon during shutdown, prevents the liquid phase from pouring back to the end bearings, ensures the normal operation of the centrifuge and protects the seals.
Smart Images
Figure CN222778230U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of centrifugal separation, in particular to a device for protecting a horizontal screw centrifuge from liquid overflow when the material distribution bin is shut down. Background Art
[0002] In the horizontal screw centrifuge, there is a transition section spiral cylinder between the spiral distribution bin and the end bearing installation position. At present, for the feed jacket cleaning water and distribution bin overflow entering therein, the transition cylinder itself is usually only relied on to suppress the backflow of liquid to the bearing end by throwing off the liquid and lifting the bearing end installation position.
[0003] The defect of this technology is that when the centrifuge rotates normally, due to the centrifugal force and the cone angle force of the cylinder, the liquid phase does not flow toward the bearing end. However, when the centrifuge is stopped, the centrifugal force decreases due to the gradual stop of the centrifuge and the reduction in speed, and the liquid phase attached to the drum wall will "collapse", and the accumulated liquid is very likely to flow back to the bearing end. When the separated material is some special material, the backflow of its mother liquid will not only affect the normal operation of the centrifuge, but also infiltrate the seal and damage it. Utility Model Content
[0004] The utility model aims to provide a device for protecting the liquid overflow of the material distribution bin of a horizontal screw centrifuge during shutdown, so as to solve the problem that the liquid phase may flow back to the end bearing during the gradual shutdown of the existing horizontal screw centrifuge, affecting the normal operation of the centrifuge and damaging the sealing component.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for protecting a liquid overflowing distribution bin of a horizontal screw centrifuge when the centrifuge is shut down. The horizontal screw centrifuge comprises a spiral cylinder, a distribution bin is arranged in the spiral cylinder, a distribution hopper is arranged in the distribution bin, a jacketed feed pipe is installed at the end of the spiral cylinder through a bearing, the end of the jacketed feed pipe extends into the distribution hopper, a spiral annular plate is connected to the spiral cylinder between the distribution hopper and the bearing mounting position, the spiral annular plate is sleeved on the jacketed feed pipe, a spiral channel is formed between the spiral annular plate and the inner wall of the spiral cylinder, and when the spiral cylinder is working, the spiral annular plate pushes the liquid phase in the spiral channel toward the distribution hopper.
[0006] Preferably, as an improvement, a drainage hole is provided on the side wall of the material distribution bin at the root of the material distribution 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 material distribution hopper and the bearing mounting position is a conical cylinder, and the spiral annular plate is conical.
[0009] The principle of this scheme is: in actual application, the spiral cylinder between the material distribution hopper and the bearing installation position is the transition section spiral cylinder. When there is no liquid overflow protection device, the flow path and mode of the liquid phase toward the bearing end are as follows: ① the material mother liquid entering the material distribution bin through the jacket feed pipe overflows the pipe mouth of the material distribution hopper and flows back to the inner cavity of the transition section spiral cylinder; ② the feed cleaning water is discharged to 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 easy to infect the bearing seal. This scheme forms a spiral channel between the spiral annular plate and the inner wall of the spiral cylinder by adding a spiral annular plate on the outside of the jacket feed pipe of the spiral cylinder in the transition section. The spiral annular plate has a certain barrier effect on the axially flowing liquid phase. During the shutdown process of the horizontal screw centrifuge, the centrifuge gradually stops from high-speed rotation. During the gradual stop process, since the spiral cylinder still has a certain rotation speed, the cleaning water flows along the spiral channel to the distribution hopper under the action of the spiral thrust; the mother liquid backflowing in ① needs to be infiltrated toward the bearing end, and can only pass through the spiral annular channel, while the spiral thrust in the opposite direction will hinder its flow. At the same time, the cleaning water to the left in the annular channel will also form a certain blocking effect on the backflow mother liquid. Through the above method, the two accumulated liquids ① and ② that may cause liquid flipping are changed in direction and discharged to the heel of the distribution hopper and discharged from the spiral cylinder through the drainage hole, thereby effectively avoiding the situation where the liquid phase backflows to the end bearing affects the normal operation of the centrifuge and damages the seal.
[0010] The advantages of this solution include:
[0011] 1. The spiral annular channel has the triple effects of blocking the liquid phase of backflow, reverse spiral thrust, and blocking the cleaning water, effectively suppressing the phenomenon of liquid overflow during shutdown.
[0012] 2. Easy installation and good interchangeability. There is no need to adjust the original structure and size of the centrifuge. It is only necessary to add the welding process of the spiral annular plate to the original welding process.
[0013] 3. The structure is simple, consisting of a spiral annular plate, and does not require complicated assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic structural diagram of an embodiment of the utility model. DETAILED DESCRIPTION
[0015] The following is further described in detail through specific implementation methods:
[0016] The reference numerals in the drawings of the specification include: a material distribution bin 1, a spiral annular plate 2, a spiral cylinder 3, a spiral channel 4, a feed pipe 5, a bearing seal 6, a material distribution hopper 7, and a drainage hole 8.
[0017] The embodiment is basically as shown in the attached Figure 1As shown: a device for protecting the liquid from overflowing the feeding bin of a horizontal screw centrifuge when the machine is stopped. The horizontal screw centrifuge comprises a spiral cylinder 3, a feeding bin 1 is arranged in the spiral cylinder 3, a feeding hopper 7 is arranged in the feeding bin 1, and a drainage hole 8 is opened on the side wall of the feeding bin 1 at the root of the feeding hopper 7. A jacket feed pipe 5 is installed at the end of the spiral cylinder 3 through a bearing, and the end of the jacket feed pipe 5 extends into the feeding hopper 7. A spiral annular plate 2 is welded on 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 a conical cylinder, and the spiral annular plate 2 is conical. The spiral annular plate 2 is sleeved on the jacket feed pipe 5, and a spiral channel 4 is formed 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 to the feeding hopper 7.
[0018] The specific implementation process is as follows: When there is no liquid overflow protection device, the flow path and mode of the liquid phase toward the bearing end are as follows: ① The material mother liquid entering the spiral feeding bin 1 through the feed pipe 5 overflows the pipe mouth of the feeding hopper 7 and flows back to the inner cavity of the transition section spiral cylinder 3. ② The feed cleaning water is discharged to 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 easy to infiltrate the bearing seal 6 to the right.
[0019] In this embodiment, after adding the spiral annular plate 2 as a liquid overflow protection device for the material bunker, the spiral annular plate 2 first has a certain barrier effect on the liquid phase flowing in the axial direction; the cleaning water in ② is first discharged to the spiral channel 4. When the centrifuge is shut down, the centrifuge gradually stops from high-speed rotation. During the gradual stop process, since the spiral cylinder still has a certain rotation speed, the cleaning water flows along the spiral channel to the material hopper 7 (to the left in the figure) under the action of the spiral thrust; the mother liquid in ① that is backflowing needs to be infiltrated toward the bearing end, and can only pass through the spiral annular channel, while the spiral thrust in the opposite direction will hinder its flow. At the same time, the cleaning water to the left in the annular channel will also form a certain blocking effect on the backflow mother liquid. In the above manner, the two accumulated liquids ① and ② that may originally cause liquid overflow are changed in direction and discharged to the heel of the material hopper 7 and discharged from the spiral cylinder through the drainage hole 8.
[0020] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A device for protecting a horizontal screw centrifuge from liquid overflow during shutdown of a material distribution bin. The horizontal screw centrifuge comprises a spiral cylinder, a material distribution bin is arranged in the spiral cylinder, a material distribution hopper is arranged in the material distribution bin, a jacket feed pipe is installed at the end of the spiral cylinder through a bearing, and the end of the jacket feed pipe extends into the material distribution hopper, characterized in that: A spiral annular plate is connected to the spiral cylinder between the distribution hopper and the bearing installation position. The spiral annular plate is sleeved on the jacket feed pipe. A spiral channel is formed between the spiral annular plate and the inner wall of the spiral cylinder. When the spiral cylinder is working, the spiral annular plate pushes the liquid phase in the spiral channel toward the distribution hopper.
2. The device for protecting the horizontal screw centrifuge from liquid overflow during shutdown of the distribution bin according to claim 1, characterized in that: A drainage hole is provided on the side wall of the material bunker at the root of the material hopper.
3. The device for protecting the horizontal screw centrifuge from liquid overflow during shutdown of the distribution bin according to claim 2, characterized in that: The rotation direction of the spiral annular plate is opposite to the rotation direction of the spiral blades on the spiral cylinder.
4. The device for protecting the horizontal screw centrifuge from liquid overflow during shutdown of the distribution bin according to claim 3, characterized in that: The spiral cylinder between the material distribution hopper and the bearing installation position is a conical cylinder, and the spiral annular plate is conical.