Device for effectively preventing cavitation of slurry pump
By designing the inverted assembly during the alumina production process, the feeding method of the slurry pump is changed from the inlet pipe to the curved feed at the bottom of the tank, the cavitation problem caused by the liquid level being lower than the cavitation threshold is solved, and slag is achieved The efficient and stable operation of the slurry pump and the cost reduction are reduced.
Patent Information
- Application Number
- CN202421170497.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-27
AI Technical Summary
In the alumina production process, the slurry pump is prone to cavitation due to the liquid level below the cavitation threshold, resulting in reduced operating efficiency and increased costs. The existing solutions are costly and have a long downtime.
Design a device including a tank, a stirring mechanism, a slurry pump and an inverter assembly. By changing the feeding method from the cross section of the entire inlet pipe to a curved feed at the bottom of the tank, the inverter assembly is used to set the slurry inlet for stirring. Below the bottom of the roller, avoid the liquid level directly below the pump inlet.
It effectively solves the cavitation problem caused by unstable liquid level, ensures the efficient and stable operation of the slurry pump and the extended life of the overflow part, reduces operating costs, and is simple and cheap.
Smart Images
Figure CN222351034U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of slurry pumps, in particular to a device for effectively preventing cavitation from occurring in slurry pumps. Background Art
[0002] In the Bayer process of producing alumina, bauxite and mother liquor enter the ball mill in a certain proportion to produce slurry. A slurry pump is required for the subsequent transportation of materials. For example, slurry pumps are used in the transportation of slurry in the raw material preparation, dissolution, sedimentation, decomposition and other processes. When the slurry is pumped and the liquid level drops to the suction port of the slurry pump, a certain amount of air will be inhaled with the slurry during the feeding process. When the air enters the pump cavity, cavitation will occur, reducing the operating efficiency of the pump and accelerating the damage of the flow-through parts, thereby increasing production costs. Therefore, in order to avoid cavitation in the slurry pump during production, the lowest liquid level of the slurry in the tank must not be lower than the suction port of the slurry pump. This lowest liquid level is the cavitation critical value of the slurry pump. However, due to various factors, the existing production line equipment is designed with some tank slurry pumps at a relatively high position, resulting in a high level of residual slurry in the tank, excessive slurry accumulation, and the slurry in the tank is stirred, causing the liquid level to fluctuate, resulting in the inlet liquid level of the slurry pump fluctuating. In addition, the flow rate and tank position control are unstable during production operation, which makes the slurry pump prone to cavitation. If the position of the slurry pump nozzle is directly modified and reduced, the cost is too high and the downtime is too long. Therefore, it is necessary to design a low-cost device that can effectively prevent cavitation in the slurry pump. Utility Model Content
[0003] The utility model provides a device for effectively preventing cavitation from occurring in a slurry pump. The feeding mode of the pump is changed from direct feeding through the cross section of the entire inlet pipe to curved feeding through the bottom of the tank. This can effectively make up for the insufficient margin of the critical value of cavitation caused by unstable liquid level, and effectively solves the cavitation problem caused by the liquid level being lower than the critical value of cavitation of the pump. The device is simple, practical and low in cost.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A device for effectively preventing cavitation of a slurry pump comprises a tank, a stirring mechanism, a slurry pump and an inverted assembly; the stirring mechanism comprises a motor and a stirring roller drivingly connected to the motor, the motor is mounted on the tank, the stirring roller is mounted in the tank, and the slurry pump is connected to an outlet pipe at the bottom of the tank; one side of the inverted assembly is fixedly and sealedly connected to the inner wall of the tank and is located at the connection between the outlet pipe and the tank; the top and the surrounding sides of the inverted assembly are sealed, and only a slurry inlet is provided at the bottom; the liquid level of the slurry inlet is lower than the bottom of the stirring roller.
[0006] Furthermore, the inverted assembly is configured as a box body with a cavity structure, and two adjacent surfaces of the box body are configured as openings. The box body is arranged at the pipe mouth of the outlet pipe, wherein one open end matches and fits with the inner wall of the tank and is fixedly sealed and connected, and the other open end faces the bottom of the tank and is spaced apart from the bottom of the tank to form the slurry inlet, so that the pipe cover of the outlet pipe is enclosed in the box body.
[0007] Furthermore, the box body is welded into a square box body by steel plates, and the bottom of the square box body and one side adjacent to the bottom are set as openings; three sides of the side opening end of the square box body are welded and fixed to the inner wall of the tank.
[0008] The beneficial effects of the utility model are:
[0009] The utility model changes the feeding mode of the slurry pump from direct feeding of the cross section of the entire inlet pipe to curved feeding at the bottom of the tank through an inverted buckle component, which can effectively make up for the insufficient margin of the cavitation critical value caused by the unstable liquid level, effectively solve the cavitation problem caused by the liquid level being lower than the cavitation critical value of the pump, ensure the efficient and stable operation of the slurry pump and extend the trial life of the flow-through parts, thereby reducing the operating cost of the slurry pump; the inverted buckle component can be made of steel plate, which is low in cost and simple and practical in structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:
[0011] Figure 1 It is a structural schematic diagram of the overall structure of the utility model;
[0012] Figure 2 It is a three-dimensional diagram of the undercut assembly in the utility model;
[0013] Figure ID:
[0014] 1-tank, 2-stirring mechanism, 3-slurry pump, 4-inverted assembly, 21-motor, 22-stirring roller, 11-export pipe. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0018] Reference Figure 1 to Figure 2 As shown, a device for effectively preventing cavitation of a slurry pump comprises a tank 1, a stirring mechanism 2, a slurry pump 3 and an inverted assembly 4; the stirring mechanism 2 comprises a motor 21 and a stirring roller 22 drivingly connected to the motor 21, the motor 21 is installed on the tank 1, the stirring roller 22 is installed in the tank 1, and the slurry pump 3 is connected to the outlet pipe 11 at the bottom of the tank 1; one side of the inverted assembly 4 is fixedly and sealedly connected to the inner wall of the tank 1, and is located at the connection between the outlet pipe 11 and the tank 1, the top and the surrounding sides of the inverted assembly 4 are sealed, and only a slurry inlet is provided at the bottom; the liquid level of the slurry inlet is lower than the bottom of the stirring roller 22. Specifically, the inverted assembly 4 is configured as a box body with a cavity structure, and two adjacent surfaces of the box body are configured as openings. The box body is arranged at the pipe mouth position of the outlet pipe 11, wherein one open end matches and fits with the inner wall of the tank 1 and is fixedly sealed and connected, and the other open end faces the bottom of the tank 1 and is spaced apart from the bottom of the tank 1 to form the slurry inlet, so that the pipe mouth of the outlet pipe 11 is covered in the box body. Such a design ensures that when the slurry drops to the liquid level height of the cavitation critical value, the slurry will not be fed directly from the cross-section of the entire inlet pipe 11, but from the bottom curve of the box body, effectively compensating for the insufficient margin of the cavitation critical value caused by the unstable liquid level, even if the liquid level fluctuates due to unstable control of the flow rate and slot position during stirring or production operation, air can be prevented from entering the feed port of the slurry pump, effectively solving the cavitation problem caused by the liquid level being lower than the pump cavitation critical value.
[0019] As a preferred solution, the box body can be welded into a square box body using steel plates, and its bottom and one side adjacent to the bottom are set as openings. The materials are generally available, and the structure is simple and easy to manufacture. The three sides of the side opening end of the square box body are welded and fixed to the inner wall of the tank 1. If the tank 1 is a cylindrical structure, its inner wall is an arc surface. At this time, the side opening end of the square box body can be cut into an arc surface of matching shape according to the shape of the inner wall of the tank 1, so that the side opening end of the square box body fits with the inner wall of the tank 1, which is convenient for welding and sealing.
[0020] The utility model changes the feeding mode of the slurry pump from direct feeding of the cross section of the entire inlet pipe to curved feeding at the bottom of the tank 1 through the inverted buckle component 4, which can effectively make up for the insufficient margin of the cavitation critical value caused by the unstable liquid level, effectively solve the cavitation problem caused by the liquid level being lower than the pump cavitation critical value, ensure the efficient and stable operation of the slurry pump 3 and extend the trial life of the flow-through parts, thereby reducing the operating cost of the slurry pump 3; the manufacturing materials of the inverted buckle component 4 are generally easy to obtain, the structure is simple to use, and the cost is low.
[0021] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. Any modification or equivalent substitution that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.
Claims
1. A device for effectively preventing cavitation of a slurry pump, comprising a tank, a stirring mechanism and a slurry pump, wherein the stirring mechanism comprises a motor and a stirring roller connected to the motor in a transmission manner, the motor is mounted on the tank, the stirring roller is mounted in the tank, and the slurry pump is connected to an outlet pipe at the bottom of the tank; characterized in that: It also includes an inverted component; one side of the inverted component is fixedly and sealedly connected to the inner wall of the tank and is located at the connection between the outlet pipe and the tank; the top and surrounding sides of the inverted component are sealed, and only a slurry inlet is provided at the bottom; the liquid level of the slurry inlet is lower than the bottom of the stirring roller.
2. A device for effectively preventing cavitation of a slurry pump according to claim 1, characterized in that: The inverted assembly is configured as a box body with a cavity structure, and two adjacent surfaces of the box body are configured as openings. The box body is arranged at the pipe mouth position of the outlet pipe, wherein one open end matches and fits with the inner wall of the tank and is fixedly sealed and connected, and the other open end faces the bottom of the tank and is spaced apart from the bottom of the tank to form the slurry inlet, so that the pipe cover of the outlet pipe is enclosed in the box body.
3. A device for effectively preventing cavitation of a slurry pump according to claim 2, characterized in that: The box body is welded into a square box body by steel plates, and the bottom of the square box body and one side adjacent to the bottom are set as openings; the three sides of the side opening end of the square box body are welded and fixed to the inner wall of the tank.