Front protective plate structure

Abstract

Disclosed in the present application is a front protective plate structure, comprising: a front protective plate body and a plurality of rectifying protruding ribs, wherein a material guiding channel configured to guide a medium to enter an impeller is formed inside the front protective plate body; and the plurality of rectifying protruding ribs are circumferentially arranged along an inner wall of the front protective plate body, and each of the rectifying protruding ribs is obliquely distributed in the direction of a center line of the front protective plate body. The structure can improve fluid flow characteristics, reduce eddies, increase the efficiency of a pump, and prolong the service life of the pump.

Description

Front shield structure TECHNICAL FIELD

[0001] The present application relates to the technical field of ore pulp conveying, in particular to a front shield structure. BACKGROUND

[0002] An ore pulp conveying pump is a pump specially used for conveying a mixture containing solid particles, i.e. ore pulp. This pump is usually used in the mining, metallurgy, coal and other industries to convey ore pulp containing a large amount of solid particles from one place to another. The working principle of the ore pulp conveying pump is similar to that of a general centrifugal pump, but it is specially designed for the characteristics of ore pulp. The ore pulp conveying pump sucks ore pulp from the inlet of the pump through the rotation of the impeller and pushes the ore pulp to the outlet through centrifugal force. In this process, the pump must be able to withstand the wear of solid particles and ensure that solid particles do not block the internal channels of the pump.

[0003] Chinese patent CN212055271U discloses a front shield structure of a slurry pump, which comprises an impeller, a front shield, a rear shield, a sheath, a rear clamping shell, a front clamping shell and an inlet short connection. The front face of the impeller is provided with the front shield, and the rear face is provided with the rear shield. The front shield is connected with the rear shield through the sheath. The outside of the rear shield is provided with the rear clamping shell, and the outside of the front shield is provided with the front clamping shell. The front clamping shell is connected with the inlet short connection. The front shield cooperates with the inlet of the impeller to form a folding angle A, and the folding angle A forms a cooperation gap taper surface with the impeller.

[0004] However, when the pump is running, vortexes will be formed inside the pump, which will cause irregular flow patterns of the fluid near the front shield, increasing the impact and wear of the fluid on the front shield. Since the solid particles in the ore pulp are ores, their specific gravity is greater than that of water, so the running track of the solid particles will be attached to the inside of the pipe wall, thereby exacerbating the wear of the pipe wall.

[0005] SUMMARY

[0006] The present application aims to overcome the above technical deficiencies and proposes a front shield structure to solve the technical problem that in the prior art, the running track of the solid particles in the ore pulp under the action of vortexes inside the pump is attached to the inside of the pipe wall, thereby exacerbating the wear of the pipe wall.

[0007] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0008] The present application provides a front shield structure, comprising: a front shield body and a plurality of flow straightening ribs, the inside of the front shield body forms a material guiding channel for guiding the medium into the impeller; a plurality of flow straightening ribs are arranged circumferentially along the inner wall of the front shield body, and each flow straightening rib is inclinedly distributed along the center line direction of the front shield body.

[0009] In some embodiments, the inner wall of the front shroud body is formed with a reference line parallel to the center line at a position corresponding to each of the rectifying ribs, and a plurality of accommodation angles are formed between each of the obliquely arranged rectifying ribs and the corresponding reference line, and the plurality of accommodation angles are equal in size.

[0010] In some embodiments, the accommodation angle is 5-45°.

[0011] In some embodiments, the front shroud body is formed with an inlet and an outlet at two ends thereof, the outlet is arranged close to the impeller of the pump, and the rectifying ribs are obliquely arranged from the inlet to the outlet in the same direction as the rotation direction of the impeller.

[0012] In some embodiments, the two ends of the rectifying ribs are flush with the two sides of the front shroud body.

[0013] In some embodiments, 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.

[0014] In some embodiments, the cross section of the rectifying rib is trapezoidal.

[0015] In some embodiments, the connection between the inner surface of the rectifying rib and the two side surfaces thereof and the connection between the two side surfaces of the rectifying rib and the inner wall of the front shroud are both arranged with arc-shaped transitions.

[0016] In some embodiments, the distance between two adjacent rectifying ribs is equal.

[0017] In some embodiments, the rectifying ribs are arranged in four.

[0018] Compared with the prior art, the front shroud structure provided by the present application is arranged with a plurality of rectifying ribs on the inner side of the front shroud body, the plurality of rectifying ribs are arranged circumferentially along the inner wall of the front shroud body, when the medium enters the pump through the material guiding channel of the front shroud body, the protruding rectifying ribs can hinder the movement track of the solid particles, can change the flow characteristics of the fluid, and thus can reduce the wear of the pipe wall by the solid medium; each of the rectifying ribs is obliquely arranged along the center line direction of the front shroud body, the obliquely arranged rectifying ribs are beneficial to the pre-rotation of the medium, the medium flows to the inlet of the impeller at a certain initial flow rate, and thus the inlet turbulence can be reduced and the anti-cavitation performance of the pump can be improved, the structure can improve the flow characteristics of the fluid, reduce the vortex, improve the efficiency of the pump, and prolong the service life of the pump. BRIEF DESCRIPTION OF DRAWINGS

[0019] FIG. 1 is a structural schematic diagram of the front shroud structure provided by the embodiment of the present application when installed;

[0020] FIG. 2 is a schematic diagram of the front shroud structure provided by the embodiment of the present application;

[0021] Fig. 3 is a right side view structural schematic diagram of the front guard structure according to an embodiment of the present application;

[0022] Fig. 4 is a front view cross-sectional structural schematic diagram of the front guard structure according to an embodiment of the present application.

[0023] Mark explanation: 1, front guard body; 11, connecting part; 2, fairing rib. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0025] In order to solve the technical problem that the solid particles in the slurry will adhere to the inner side of the pipe wall under the vortex action inside the pump, which will exacerbate the wear of the pipe wall, the present application provides a front guard structure, which can improve the fluid flow characteristics, reduce the vortex, improve the efficiency of the pump and prolong the service life of the pump.

[0026] It should be noted that the front guard structure described in the present application is used in but not limited to slurry conveying pump and the like. In order to facilitate the description, in the present application, only the front guard structure applied to the slurry conveying pump is taken as an example for description, and the principle of the front guard structure applied to other types of equipment is substantially the same as that applied to the slurry conveying pump, which is not described here.

[0027] Please refer to Figs. 1 to 4, the front guard structure comprises: a front guard body 1 and a plurality of fairing ribs 2, the inside of the front guard body 1 forms a material guiding channel for guiding the medium into the impeller; a plurality of the fairing ribs 2 are arranged circumferentially along the inner wall of the front guard body 1, and each of the fairing ribs 2 is inclinedly distributed along the center line direction of the front guard body 1.

[0028] In the present scheme, a plurality of the fairing ribs 2 are arranged circumferentially along the inner wall of the front guard body 1, when the medium enters the pump through the material guiding channel of the front guard body 1, the protruding fairing ribs 2 can hinder the movement track of the solid particles, which can change the flow characteristics of the fluid, thereby reducing the wear of the pipe wall by the solid medium; each of the fairing ribs 2 is inclinedly distributed along the center line direction of the front guard body 1, the inclinedly distributed fairing ribs 2 are beneficial to the pre-rotation of the medium, so that the medium flows to the impeller inlet with a certain initial flow rate, thereby the inlet turbulence can be reduced and the anti-cavitation performance of the pump can be improved.

[0029] In the embodiment, the several rectifying ribs 2 are arranged in a ring array with the center line of the front baffle body 1 as a reference, the distance between two adjacent rectifying ribs 2 is equal, specifically, the front baffle body 1 is formed with a reference line parallel to the center line at a position corresponding to each rectifying rib 2 on the inner wall, and a plurality of accommodation angles are respectively formed between each inclined rectifying rib 2 and the corresponding reference line, the sizes of the several accommodation angles are equal, so that the inclined rectifying rib 2 can promote the fluid to be more uniformly distributed to reduce the phenomenon of local speed being too high or too low.

[0030] Preferably, in the embodiment, the accommodation angle is 5-45°, and the angle of the rectifying rib 2 is specifically determined according to the fluid characteristics and the specific working conditions of the pump to achieve the best flow effect.

[0031] Further, in some embodiments, the inner wall of the front baffle body 1 is arranged in a cylindrical structure, the two ends of the front baffle body 1 are respectively formed with an inlet and an outlet, the outlet is arranged close to the impeller of the pump, and an outwardly protruding annular connecting part 11 is arranged outside the outlet of the front baffle body 1 for connecting the pump shell. In implementation, the ore pulp medium enters the guide channel through the inlet and is discharged into the impeller through the outlet. The inclined direction of the rectifying rib 2 from the inlet to the outlet is arranged to be the same as the rotation direction of the impeller, specifically, please refer to FIG. 3, which is a right side view structural schematic diagram of the front baffle structure provided in the embodiment, at this time, the front end of the front baffle body 1 is the inlet, the rear end is the outlet, and the positions correspond to the impeller, wherein the rectifying rib 2 is arranged to be inclined in the counterclockwise direction from front to back, and correspondingly, the impeller rotates counterclockwise when working, which facilitates the pre-rotation of the medium into the impeller.

[0032] Preferably, in the embodiment, the two ends of the rectifying rib 2 are flush with the two sides of the front baffle body 1 respectively. The cross section of the rectifying rib 2 is trapezoidal, one side of each rectifying rib 2 is arranged as an inclined surface, so that the width of the inner side of the rectifying rib 2 is greater than the width of the outer side. The rectifying rib 2 adopts a slope streamline design, which further optimizes the path of the fluid entering the volute, avoids vortex in the negative pressure area, and makes the structure have a longer service life.

[0033] Further, the height of the protrusion of the rectifying rib 2 is between 1-2 times the thickness of the inlet wall of the front baffle body 1. The height of the protrusion should not be too high, otherwise the fluid resistance will be increased; nor should it be too low, otherwise the design purpose will be difficult to achieve.

[0034] Preferably, in the embodiment, the connection between the inner surface of the flow regulation protrusion 2 and its two side faces and the connection between the two side faces of the flow regulation protrusion 2 and the inner wall of the front baffle are provided with arc-shaped transitions. The arc-shaped transitions can smoothly transition the fluid flow path and reduce the formation of vortexes. Vortexes can cause energy loss and efficiency reduction, and the round arc chamfer can effectively reduce this phenomenon. At the same time, the arc-shaped transition can also improve the flowability of the fluid, prevent solid particles from depositing near the front baffle, and reduce the risk of blockage.

[0035] Preferably, in the embodiment, the flow regulation protrusion 2 is provided with four.

[0036] It should be noted that in other embodiments, the number of flow regulation protrusions 2 is not limited, and in general, the number of protrusions on the front baffle can vary from a few to a dozen. The specific number needs to be determined according to the fluid characteristics and the working conditions of the pump, etc., and through computational fluid dynamics (CFD) simulation and actual testing.

[0037] The present application sets several flow regulation protrusions 2 inside the front baffle body 1, which are arranged circumferentially along the inner wall of the front baffle body 1. When the medium enters the pump through the material guiding channel of the front baffle body 1, the protruding flow regulation protrusions 2 can hinder the movement trajectory of solid particles and change the flow characteristics of the fluid, thereby reducing the wear of the pipe wall by solid medium; each flow regulation protrusion 2 is inclinedly distributed along the center line direction of the front baffle body 1, and the inclinedly distributed flow regulation protrusion 2 is beneficial to the pre-rotation of the medium, so that the medium flows to the impeller inlet with a certain initial flow rate, thereby reducing the inlet turbulence and improving the anti-cavitation performance of the pump. The structure can improve the fluid flow characteristics, reduce vortexes, improve the efficiency of the pump, and prolong the service life of the pump.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper" and "lower" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be interpreted broadly, for example, it can be a fixed connection, or 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 a communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] It should be noted that, in the present application, the terms "comprising", "containing" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0040] The specific embodiments of the present application described above are not intended to be limiting. Any other changes and modifications that come within the scope of the technical concepts of the present application are intended to be included in the claims of the present application.

Claims

1. A front apron structure characterized by, The utility model relates to a front shroud of a centrifugal pump, comprising: a front shroud body, an inner part of the front shroud body forms a material guiding passage for guiding medium into an impeller; and, a plurality of rectifying convex ribs, the plurality of rectifying convex ribs are arranged circumferentially along an inner wall of the front shroud body, and each of the rectifying convex ribs is distributed obliquely along a center line direction of the front shroud body.

2. The front apron structure according to claim 1, characterized by A reference line parallel to the center line is formed on the inner wall of the front shroud body at a position corresponding to each of the rectifying convex ribs, and a plurality of accommodation angles are respectively formed between each of the obliquely arranged rectifying convex ribs and the corresponding reference line, and the plurality of accommodation angles are equal in size.

3. The front apron structure according to claim 2, characterized by The accommodation angle is 5-45 DEG.

4. The front apron structure according to claim 1, characterized by Inlets and outlets are respectively formed at two ends of the front shroud body, the outlet is arranged close to the impeller of the pump, and the oblique direction of the rectifying convex rib from the inlet to the outlet is the same as the rotating direction of the impeller.

5. The front apron structure according to claim 1, characterized by The two ends of the rectifying convex rib are flush with the two sides of the front shroud body.

6. The front apron structure according to claim 1, characterized by One side of each of the rectifying convex ribs is arranged as an inclined surface, and the width of the inner side of the rectifying convex rib is greater than the width of the outer side.

7. The front apron structure according to claim 6, characterized by The cross section of the rectifying convex rib is trapezoidal.

8. The front apron structure according to claim 1, characterized by Arc transitions are arranged at the connection between the inner surface of the rectifying convex rib and the two side surfaces, and at the connection between the two side surfaces of the rectifying convex rib and the inner wall of the front shroud.

9. The front apron structure according to claim 1, characterized by The distance between two adjacent rectifying convex ribs is equal.

10. The front apron structure according to claim 1, characterized by The rectifying convex rib is provided with four.

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