Front protective plate structure

Abstract

The utility model discloses a front protection plate structure which comprises a front protection plate body and a plurality of rectification convex ribs, and a material guiding channel used for guiding a medium to enter an impeller is formed in the front protection plate body; the plurality of rectification convex ribs are arranged along the circumferential direction of the inner wall of the front guard plate body, and each rectification convex rib is obliquely distributed along the direction of the center line of the front guard plate body, so that the structure can improve the flowing characteristic of fluid, reduce eddy current, improve the efficiency of a pump and prolong the service life of the pump.

Description

Technical Field

[0001] The present application relates to the technical field of slurry transportation, and in particular to a front guard plate structure. Background Art

[0002] A slurry pump is a pump specifically designed to transport mixtures containing solid particles (i.e., slurry). These pumps are commonly used in industries such as mining, metallurgy, and coal mining to transport slurry containing large amounts of solid particles from one location to another. The operating principle of a slurry pump is similar to that of a typical centrifugal pump, but it is specifically designed to address the specific characteristics of slurry. The slurry pump draws slurry into the pump's inlet through the rotation of its impeller and propels it toward the outlet through centrifugal force. During this process, the pump must be able to withstand the wear and tear of the solid particles and ensure that the solid particles do not clog the pump's internal passages.

[0003] Chinese patent CN212055271U discloses a front guard plate structure of a slurry pump, which includes an impeller, a front guard plate, a rear guard plate, a sleeve, a rear sandwich shell, a front sandwich shell, and an inlet short circuit. The front guard plate is provided in front of the impeller, and the rear guard plate is provided at the rear. The front guard plate is connected to the rear guard plate through the sleeve. The rear sandwich shell is provided on the outside of the rear guard plate, and the front sandwich shell is provided on the outside of the front guard plate. The front sandwich shell is connected to the inlet short circuit. The front guard plate and the impeller inlet mating part extend out a corner A, and the corner A forms a mating clearance cone with the impeller.

[0004] However, when the pump is running, vortices will form inside. The vortices will cause the fluid to have an irregular flow pattern near the front guard plate, increasing the impact and wear of the fluid on the front guard plate. Because the solid particles in the slurry are ore, their specific gravity is greater than that of water, the running trajectory of the solid particles will stick to the inside of the pipe wall, thereby aggravating the wear of the pipe wall. Summary of the Invention

[0005] The purpose of this application is to overcome the above technical deficiencies and propose a front guard plate structure to solve the technical problem in the prior art that solid particles in the slurry, under the action of the vortex inside the pump, have their running trajectory stick to the inner side of the pipe wall, which will aggravate the wear of the pipe wall.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0007] The present application provides a front guard plate structure, comprising: a front guard plate body and a plurality of straightening ribs, wherein a guide channel for guiding the medium into the impeller is formed inside the front guard plate body; the plurality of straightening ribs are arranged circumferentially along the inner wall of the front guard plate body, and each of the straightening ribs is inclined and distributed along the center line direction of the front guard plate body.

[0008] In some embodiments, a reference line parallel to the center line is formed on the inner wall of the front guard plate body at a position corresponding to each of the rectifying ribs, and several placement angles are formed between each inclined rectifying rib and the corresponding reference line, and the sizes of the several placement angles are equal.

[0009] In some embodiments, the placement angle is 5-45°.

[0010] In some embodiments, an inlet and an outlet are formed at both ends of the front guard body, the outlet is arranged close to the impeller of the pump, and the inclination direction of the rectifying rib from the inlet to the outlet is the same as the rotation direction of the impeller.

[0011] In some embodiments, both ends of the rectifying rib are flush with both sides of the front guard plate body.

[0012] In some embodiments, one side of each of the rectifying ribs is configured as an inclined surface, and the width of the inner side of the rectifying rib is greater than the width of the outer side thereof.

[0013] In some embodiments, the cross-section of the rectifying rib is trapezoidal.

[0014] In some embodiments, arc-shaped transitions are provided at the connection between the inner surface of the straightening rib and its two side surfaces, and at the connection between the two side surfaces of the straightening rib and the inner wall of the front guard plate.

[0015] In some embodiments, the distances between two adjacent rectifying ribs are equal.

[0016] In some embodiments, four straightening ribs are provided.

[0017] Compared with the prior art, the front guard plate structure provided in the present application is provided with a plurality of rectifying ribs on the inner side of the front guard plate body, and the plurality of rectifying ribs are arranged circumferentially along the inner wall of the front guard plate body. When the medium enters the pump through the material guide channel of the front guard plate body, the raised rectifying ribs can hinder the movement trajectory of the solid particles, change the flow characteristics of the fluid, and thus reduce the wear of the solid medium on the pipe wall; each rectifying rib is inclined along the center line direction of the front guard plate body, and the inclined rectifying ribs are conducive to the pre-rotation of the medium, so that the medium flows to the impeller inlet at a certain initial flow velocity, thereby reducing the inlet turbulence and improving the anti-cavitation performance of the pump. This structure can improve the fluid flow characteristics, reduce eddy currents, improve the efficiency of the pump and extend the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the front guard plate structure provided in an embodiment of the present application when it is installed;

[0019] Figure 2is a schematic diagram of the three-dimensional structure of the front guard plate structure provided in an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the right side structure of the front guard plate structure provided in an embodiment of the present application;

[0021] Figure 4 It is a schematic diagram of the main cross-sectional structure of the front guard plate structure provided in an embodiment of the present application.

[0022] Explanation of the accompanying reference numerals: 1. front guard plate body; 11. connecting portion; 2. rectifying rib. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] In order to solve the technical problem that the solid particles in the slurry, under the action of the vortex inside the pump, run along the inner side of the pipe wall, which will aggravate the wear of the pipe wall, the present application provides a front guard plate structure that can improve the fluid flow characteristics, reduce vortexes, improve the efficiency of the pump and extend the service life of the pump.

[0025] It should be noted that the front guard plate structure described in this application is used for but not limited to slurry conveying pumps, etc. For the sake of convenience, in this application, only the application of the front guard plate structure to a slurry conveying pump is used as an example for explanation. The principle of applying the front guard plate structure to other types of equipment is essentially the same as the principle of applying it to a slurry conveying pump, and will not be repeated here.

[0026] See also Figures 1 to 4 The front guard plate structure includes: a front guard plate body 1 and several straightening ribs 2, the interior of the front guard plate body 1 forms a material guide channel for guiding the medium into the impeller; several straightening ribs 2 are arranged circumferentially along the inner wall of the front guard plate body 1, and each of the straightening ribs 2 is inclined along the center line direction of the front guard plate body 1.

[0027] In this solution, several of the rectifying ribs 2 are arranged circumferentially along the inner wall of the front guard plate body 1. When the medium enters the pump through the material guide channel of the front guard plate body 1, the raised rectifying ribs 2 can hinder the movement trajectory of the solid particles, change the flow characteristics of the fluid, and thus reduce the wear of the solid medium on the pipe wall; each of the rectifying ribs 2 is inclined along the center line direction of the front guard plate body 1. The inclined rectifying ribs 2 are conducive to the pre-rotation of the medium, so that the medium flows to the impeller inlet at a certain initial flow velocity, thereby reducing the inlet turbulence and improving the anti-cavitation performance of the pump.

[0028] In this embodiment, a plurality of the rectifying ribs 2 are arranged in a circular array with the center line of the front guard plate body 1 as a reference, and the distance between two adjacent rectifying ribs 2 is equal. Specifically, a reference line parallel to the center line is formed at a position corresponding to each of the rectifying ribs 2 on the inner wall of the front guard plate body 1, and a plurality of placement angles are formed between each of the inclined rectifying ribs 2 and the corresponding reference line. The sizes of the plurality of the placement angles are equal, so that the inclined rectifying ribs 2 can promote a more even distribution of the fluid to reduce the phenomenon of excessively high or low local velocities.

[0029] Preferably, in this embodiment, the placement angle is 5-45°, and the angle of the rectifying rib 2 is determined according to the fluid characteristics and the specific working conditions of the pump to achieve the best flow effect.

[0030] Furthermore, in some embodiments, the inner wall of the front guard body 1 is configured as a cylindrical structure, with an inlet and an outlet formed at each end of the front guard body 1, the outlet being located close to the pump impeller. An outwardly protruding annular connecting portion 11 is provided on the outer side of the outlet of the front guard body 1 for connecting to the pump casing. During operation, the slurry medium enters the guide channel through the inlet and is discharged into the impeller through the outlet. The inclination direction of the rectifying rib 2 from the inlet to the outlet is configured to be the same as the rotation direction of the impeller. For details, please refer to Figure 3 , Figure 3 This is a right-side structural schematic diagram of the front guard plate structure provided in an embodiment of the present application. At this time, the front end of the front guard plate body 1 is the inlet and the rear end is the outlet, which corresponds to the position of the impeller. The rectifying rib 2 is tilted counterclockwise from front to back. Correspondingly, the impeller rotates counterclockwise when working, which facilitates the pre-rotation of the medium into the impeller.

[0031] Preferably, in this embodiment, the ends of the straightening ribs 2 are flush with the sides of the front guard plate body 1. The straightening ribs 2 have a trapezoidal cross-section, with one side of each rib 2 being inclined, such that the inner width of the rib 2 is greater than the outer width. The ribs 2 adopt a sloped, streamlined design, further optimizing the fluid's entry path into the volute, avoiding vortices in the negative pressure zone and extending the structural life.

[0032] Furthermore, the height of the protrusion of the rectifying rib 2 is between 1-2 times the thickness of the inlet wall of the front guard plate body 1. The height of the protrusion should not be too high, otherwise it will increase the fluid resistance; nor should it be too low, otherwise it will be difficult to achieve the design purpose.

[0033] Preferably, in this embodiment, curved transitions are provided at the junctions between the inner surface of the straightening rib 2 and its two side surfaces, as well as at the junctions between the two side surfaces of the straightening rib 2 and the inner wall of the front guard plate. These curved transitions can smoothly transition the fluid flow path and reduce the formation of eddies. Curved chamfers can effectively reduce eddies, which can lead to energy loss and reduced efficiency. Furthermore, these curved transitions can improve fluid flow, prevent solid particles from settling near the front guard plate, and reduce the risk of blockage.

[0034] Preferably, in this embodiment, four rectifying ribs 2 are provided.

[0035] It should be noted that in other embodiments, there is no limit on the number of the straightening ribs 2. Generally, the number of ribs on the front guard plate can range from a few to more than ten. The specific number depends on the fluid characteristics and pump operating conditions, and is determined through computational fluid dynamics (CFD) simulation and actual testing.

[0036] The present application sets a number of rectifying ribs 2 on the inner side of the front guard plate body 1, and the several rectifying ribs 2 are arranged circumferentially along the inner wall of the front guard plate body 1. When the medium enters the pump through the material guide channel of the front guard plate body 1, the raised rectifying ribs 2 can hinder the movement trajectory of solid particles, change the flow characteristics of the fluid, and thus reduce the wear of the solid medium on the pipe wall; each rectifying rib 2 is tilted along the center line direction of the front guard plate body 1, and the tilted rectifying ribs 2 are conducive to pre-rotation of the medium, so that the medium flows to the impeller inlet at a certain initial flow velocity, thereby reducing the inlet turbulence and improving the anti-cavitation performance of the pump. This structure can improve the fluid flow characteristics, reduce eddy currents, improve the efficiency of the pump and extend the service life of the pump.

[0037] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] It should be noted that, in this application, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0039] The specific implementation methods of the present application described above do not limit the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A front guard plate structure, characterized in that: include: A front guard plate body, wherein a guide channel for guiding the medium into the impeller is formed inside the front guard plate body; as well as, A plurality of rectifying ribs are arranged along the circumference of the inner wall of the front guard plate body, and each rectifying rib is obliquely distributed along the center line direction of the front guard plate body.

2. The front guard plate structure according to claim 1, characterized in that: A reference line parallel to the center line is formed on the inner wall of the front guard plate body at a position corresponding to each of the rectifying ribs, and a plurality of placement angles are formed between each inclined rectifying rib and the corresponding reference line, and the sizes of the plurality of placement angles are equal.

3. The front guard plate structure according to claim 2, characterized in that: The placement angle is 5-45°.

4. The front guard plate structure according to claim 1, characterized in that: An inlet and an outlet are formed at both ends of the front guard plate body, the outlet is arranged close to the impeller of the pump, and the inclination direction of the rectifying rib from the inlet to the outlet is the same as the rotation direction of the impeller.

5. The front guard plate structure according to claim 1, characterized in that: The two ends of the rectifying rib are respectively flush with the two sides of the front guard plate body.

6. The front guard plate structure according to claim 1, characterized in that: One side of each of the rectifying ribs is arranged as an inclined surface, and the width of the inner side of the rectifying rib is greater than the width of the outer side thereof.

7. The front guard plate structure according to claim 6, characterized in that: The cross section of the rectifying rib is trapezoidal.

8. The front guard plate structure according to claim 1, characterized in that: Arc-shaped transitions are provided at the connection between the inner surface of the rectifying rib and its two side surfaces, and at the connection between the two side surfaces of the rectifying rib and the inner wall of the front guard plate.

9. The front guard plate structure according to claim 1, characterized in that: The distances between two adjacent rectifying ribs are equal.

10. The front guard plate structure according to claim 1, characterized in that: There are four rectifying ribs.

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