Pulping process pump

Abstract

The utility model provides a pulping process pump, and belongs to the technical field of valve pumps, the pulping process pump comprises a pump body, a pump cover, a pump shaft, a bearing frame and a bearing, the pump body is provided with a feed port and a discharge port, the pump body is internally provided with an impeller cavity communicated with the feed port and the discharge port, and an impeller is rotatably arranged in the impeller cavity; the pump cover is installed on the pump body, the bearing frame is installed on the side, away from the feeding port, of the pump body, the pump shaft is rotationally installed in the bearing frame through a bearing, and the end of the pump shaft penetrates through the pump cover and is fixedly connected with the axis of the impeller. The side wall of the impeller cavity comprises a cutting wall, the cutting wall is located on the side, away from the feeding port, of the impeller and is opposite to the impeller, and the side wall, facing the impeller, of the cutting wall is provided with a rear cutting part. When obstructions such as fiber media or obstructive impurities enter the side, away from the feeding port, of the impeller, the obstructions are cut by the rear cutting part under the driving action of the impeller, the situation that resistance of the back side of the impeller is increased or even the impeller is blocked is avoided, the operation efficiency of equipment is guaranteed, and the overhaul period of the equipment is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of valve pumps, and more specifically, relates to a pulping process pump. Background Art

[0002] During the pulping process, the transportation of pulping slurries and semi-finished slurries relies on process pumps. For slurries containing blockages such as fibrous media or obstructive impurities, the blockages may cause the flow channels to become blocked when passing through the pump's internal flow channels, affecting the operation of the equipment.

[0003] In response to the above problems, the invention patent with the publication number CN108980050A (publication date: December 11, 2018) discloses a pulping process pump. It sets cut grooves on the front guard plate of the pump's internal flow channels and uses the cut grooves to cut the fibrous media, alleviating the problem of impeller blockage. However, there are still certain defects in the technical solution of this disclosed patent. Specifically, although the blockages can be cut by the cut grooves, since the cut grooves cannot cover the entire flow cross-section, after long-term use, there will still be some uncut blockages that penetrate into the impeller. The blockages that penetrate into the impeller will bypass to the back side of the impeller (the side of the impeller facing away from the pump's feed port) and accumulate, resulting in an increase in resistance or even blockage on the back side of the impeller, affecting the operation of the equipment. That is, this solution cannot solve the problem of blockage on the back side of the impeller by fibrous blockages. Summary of the Invention

[0004] The utility model provides a pulping process pump for solving the problem that the back side of the impeller is easily blocked by blockages such as fibrous media.

[0005] To achieve the above object, the technical solution adopted in this application is: to provide a pulping process pump, including a pump body, a pump cover, a pump shaft, a bearing bracket, and bearings. The pump body has a feed port and a discharge port, and an impeller chamber communicating the feed port and the discharge port is provided inside the pump body. An impeller is rotatably arranged in the impeller chamber; the pump cover is installed on the pump body, the bearing bracket is installed on the side of the pump body facing away from the feed port, the pump shaft is rotatably installed in the bearing bracket through the bearings, and the end of the pump shaft passes through the pump cover and is fixedly connected to the axis of the impeller;

[0006] The side wall of the impeller chamber includes a cutting wall, which is located on the side of the impeller facing away from the feed port and is arranged opposite to the impeller. A rear cutting part is provided on the side wall of the cutting wall facing the impeller.

[0007] Optionally, the pump cover is located on the side of the impeller facing away from the feed port, and the cutting wall is the side wall of the pump cover facing the impeller.

[0008] Optionally, a rear guard plate is installed on the inner wall of the pump body. The rear guard plate is located on the side of the impeller facing away from the feed port, and the cutting wall is the side wall of the rear guard plate facing the impeller.

[0009] Optionally, the rear cutting part extends along the radial direction of the impeller. The end of the rear cutting part far from the impeller axis is an open end. There are several rear cutting parts, and the several rear cutting parts are evenly arranged around the axis of the cutting wall.

[0010] Optionally, a front guard plate is installed on the inner wall of the pump body. The front guard plate is arranged on the side of the impeller facing the feed port, and the front guard plate is provided with a front cutting part facing the impeller.

[0011] Optionally, the front guard plate is annular. The front guard plate includes an annular plate surface and a convex edge located on the inner edge of the annular plate surface; the convex edge bends and extends in the direction of the feed port, and the front cutting part is located on the inner wall of the convex edge.

[0012] Optionally, the front cutting part extends along the axial direction of the front guard plate. The end of the front cutting part far from the feed port is an open end.

[0013] Optionally, there are several front cutting parts, and the several front cutting parts are evenly arranged around the axis of the front guard plate.

[0014] Optionally, it further includes an adjusting bolt. The adjusting bolt penetrates through the pump body from the outside of the pump body and is screwed onto the front guard plate.

[0015] Optionally, the front cutting part and the rear cutting part are cutting grooves or cutting convex edges.

[0016] The beneficial effects of the technical solution of this application compared with the prior art are as follows:

[0017] By arranging the rear cutting part in the direction away from the feed port of the impeller, when blockages such as fibrous media or obstructive impurities enter this place, the blockages are cut by the rear cutting part under the driving action of the impeller, avoiding the situation of increased resistance or even blockage on the back side of the impeller, ensuring the operation efficiency of the equipment and extending the maintenance cycle of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a cross-sectional view of the overall structure of the pulping process pump;

[0020] Figure 2 For Figure 1 The partial enlarged view at A in

[0021] Figure 3 It is a schematic diagram of the structure of the cutting wall and the rear cutting part;

[0022] Figure 4 It is a schematic diagram of the structure of the front guard plate and the front cutting part;

[0023] Figure 5 It is a partial structural cross-sectional view of a pulping process pump with a rear guard plate.

[0024] Icons: 1. Pump body; 2. Pump cover; 3. Pump shaft; 4. Bearing frame; 5. Bearing; 6. Inlet; 7. Outlet; 8. Impeller chamber; 9. Impeller; 10. Cutting wall; 11. Rear cutting part; 12. Rear guard plate; 13. Front guard plate; 14. Front cutting part; 15. Annular plate surface; 16. Raised edge; 17. Adjusting bolt. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Embodiment 1:

[0027] This embodiment provides a pulping process pump based on Figure 1 and Figure 2 As shown, it includes a pump body 1, a pump cover 2, a pump shaft 3, a bearing frame 4 and a bearing 5. The pump body 1 has a feed port 6 and a discharge port 7. The pump body 1 has an impeller chamber 8 connecting the feed port 6 and the discharge port 7. An impeller 9 is rotatably arranged in the impeller chamber 8. The pump cover 2 is installed on the pump body 1, and the bearing frame 4 is installed on the side of the pump body 1 away from the feed port 6. The pump shaft 3 is rotatably installed in the bearing frame 4 through the bearing 5. The end of the pump shaft 3 passes through the pump cover 2 and is fixedly connected to the axis of the impeller 9. The end of the pump shaft 3 away from the impeller 9 is used to connect with a power system such as a motor. The motor drives the impeller 9 to rotate through the pump shaft 3. The slurry enters the pump body 1 from the feed port 6 and is pumped out from the discharge port 7.

[0028] On the basis of the above structure, the side wall of the impeller chamber 8 includes a cutting wall 10, which is located on the side of the impeller 9 away from the feed port 6 and is arranged opposite to the impeller 9, and the side wall of the cutting wall 10 facing the impeller 9 is provided with a rear cutting portion 11. During the operation of the equipment, when obstructions such as fiber media or obstructive impurities enter the rear cutting portion 11, the obstructions can be cut by the rear cutting portion 11 under the driving action of the impeller 9, thereby avoiding the increase of resistance or blockage of the impeller 9, ensuring the equipment operation efficiency and extending the maintenance cycle of the equipment. The setting of the rear cutting portion 11 has a better anti-blocking effect for both the open impeller 9 and the semi-open impeller 9. Especially for the semi-open impeller 9, due to the blocking effect of its rear cover plate, the obstruction is more likely to remain on the side of the impeller 9 away from the feed port 6. The setting of the rear cutting portion 11 on this side can effectively reduce the residual accumulation of the obstruction. It should be noted that the cutting wall 10 is located on the side of the impeller 9 away from the feed port 6, which can be as follows Figure 1 As shown, they are parallel to each other, and can also be arranged at a certain angle to each other according to actual conditions. The function of the rear cutting part 11 can be achieved by only ensuring that the two are opposite to each other.

[0029] In this embodiment, the pump cover 2 is located on the side of the impeller 9 away from the feed port 6, and the cutting wall 10 is the side wall of the pump cover 2 facing the impeller 9, that is, the cutting portion is directly processed on the pump cover 2, and the integrity is relatively strong. The rear cutting portion 11 extends along the radial direction of the impeller 9, and can specifically extend in a straight line or an arc to ensure the radial coverage of the cutting area. There can be a plurality of rear cutting portions 11, such as three or four, and the plurality of rear cutting portions 11 are evenly arranged around the rotation center of the impeller 9, which can increase the cutting efficiency and ensure the uniformity of the cutting effect in all directions around the rotation axis of the impeller 9.

[0030] Further, based on Figure 1 , Figure 2 and Figure 4 As shown, the inner wall of the pump body 1 is installed with a front guard plate 13, which is arranged on the side of the impeller 9 facing the feed port 6, and the front guard plate 13 is provided with a front cutting portion 14 facing the impeller 9. The front cutting portion 14 cuts the obstruction in the slurry that has just entered the feed port 6 to avoid obstruction of the impeller 9. The front cutting portion 14 and the rear cutting portion 11 work together to effectively reduce the dead angle of the obstruction in the impeller chamber 8 and ensure the efficient operation of the equipment.

[0031] In this embodiment, the front guard plate 13 is annular. The front guard plate 13 includes an annular plate surface 15 and a convex edge 16 located along the inner edge of the annular plate surface 15. The convex edge 16 bends and extends towards the feed inlet 6, and the front cutting portion 14 is located on the inner wall of the convex edge 16. After the slurry enters from the feed inlet 6, it can immediately come into contact with the front cutting portion 14. Compared with setting the front cutting portion 14 at the annular plate surface 15, the front cutting portion 14 provided at the convex edge 16 can cut the blockage earlier before the slurry enters deep into the impeller 9, reducing the situation where the blockage is difficult to cut because it adheres too much to the surface of the impeller 9.

[0032] Preferably, the front cutting portion 14 extends along the axial direction of the front guard plate 13. When the slurry is driven by the impeller 9, a circumferential motion state along the inner edge of the convex edge 16 will be generated, enabling the blockage in the slurry to have a velocity component perpendicular to the extension direction of the front cutting portion 14, so that the blockage can better friction-cut with the front cutting portion 14 to ensure the cutting effect. Similarly, several front cutting portions 14 can be provided, such as three or four, etc. The several front cutting portions 14 are evenly arranged around the rotation center of the impeller 9 to increase the cutting efficiency and ensure the uniformity of the cutting effect in all directions around the rotation axis of the impeller 9.

[0033] Furthermore, based on Figure 1 as shown, it further includes an adjusting bolt 17. The adjusting bolt 17 passes through the pump body 1 from the outside of the pump body 1 and is screwed into the front guard plate 13 to connect the front guard plate 13 with the pump body 1. At the same time, by screwing the adjusting bolt 17 from the outside of the pump body 1, the gap between the front guard plate 13 and the impeller 9 can be adjusted. When transporting abrasive media such as solid particles, the gap between the front guard plate 13 and the impeller 9 can be adjusted to ensure that the pump always operates in the high-efficiency zone. By simultaneously setting the adjusting bolt 17, the front cutting portion 14, and the rear cutting portion 11, the pulping process pump can transport slurries containing solid particles and fibrous media simultaneously and ensure the operation efficiency of the equipment.

[0034] Preferably, based on Figure 3 and Figure 4 as shown, both the front cutting portion 14 and the rear cutting portion 11 are cutting grooves. The grooved structure is convenient for machining and does not require additional space for avoiding the front cutting portion 14 and the rear cutting portion 11, ensuring the compactness of the structure. The front cutting portion 14 and the rear cutting portion 11 are alternatively cutting convex edges with a convex structure (not shown in the drawings). The cutting convex edges can also effectively cut the blockage and can avoid weakening the structural strength of the cutting wall 10 and the front guard plate 13 due to material removal. Of course, one of the front cutting portion 14 and the rear cutting portion 11 can be a cutting groove and the other can be a cutting convex edge, and specific combinations can be designed according to actual situations.

[0035] Preferably, the end of the rear cutting part 11 away from the axis of the impeller 9 is an open end. The open end means that there is no blocking structure or obstacle at the end. For example, for the cutting groove, the open end is a through groove structure. For the cutting convex edge, there is no structure such as a flanging that can cause blockage at the end of the open end. During the rotation of the slurry, the blockage will move along the extending direction of the rear cutting part 11 under the action of centrifugal force and be discharged from the open end without being blocked, avoiding residue in the rear cutting part 11 and affecting the cutting effect. Similarly, the end of the front cutting part 14 away from the feed port 6 is an open end. The blockage at the feed port 6 will be discharged from the open end along the flow direction after entering the front cutting part 9, avoiding blocking the feed port 6 and affecting the cutting effect.

[0036] In this embodiment, based on Figure 1 As shown, it further includes a bearing bracket 4 and a bearing 5. The bearing bracket 4 is installed on the side of the pump body 1 away from the feed port 6. Specifically, it can be conveniently disassembled and repaired by bolt connection, or integrally processed to increase the integrity. The pump shaft 3 rotates through the bearing bracket 4 through the bearing 5, and the end of the pump shaft 3 penetrates into the impeller chamber 8 and is connected to the axis of the impeller 9. Since the seals between the pump shaft 3 and the pump body 1 and the connection between the pump cover 2 and the pump body 1 are all prior arts, they will not be elaborated here.

[0037] Working principle: After the pulping process pump is started, the slurry enters from the feed port 6 and generates relative movement with the front cutting part 14 on the front guard plate 13 driven by the impeller 9. The blockage in the slurry can generate circumferential relative movement with the front cutting part 14 before penetrating into the impeller 9 and be cut, so as to avoid too much blockage penetrating into the impeller 9 and causing blockage of the impeller 9. The front cutting part 14 extends along the axis direction of the front guard plate 13, and the end of the front cutting part 14 away from the feed port 6 is set as an open end. The blockage at the feed port 6 will be discharged from the open end along the flow direction after entering the front cutting part 9, avoiding blocking the feed port 6. For the blockage that penetrates between the impeller 9 and the cutting wall 10, it generates relative movement with the radially extending rear cutting part 11 driven by the impeller 9 and is cut by the rear cutting part 11, so as to avoid an increase in the resistance on the back side of the impeller 9 or being blocked. The rear cutting part 11 extends along the radial direction of the impeller 9, and the end of the rear cutting part 11 away from the axis of the impeller 9 is also set as an open end. The blockage moves along the extending direction of the rear cutting part 11 and is discharged from the open end, avoiding residue on the rear cutting part 11. The combined action of the front cutting part 14 and the rear cutting part 11 can effectively reduce the residual dead angle of blockage in the impeller chamber 8 and ensure the efficient operation of the equipment.

[0038] Embodiment 2:

[0039] This embodiment provides a pulping process pump, based on Figure 5As shown, the difference from the solution in Example 1 is that a rear guard plate 12 is installed on the inner wall of the pump body 1, and the rear guard plate 12 is located on the side of the impeller 9 away from the feed port 6, and the cutting wall 10 is the side wall of the rear guard plate 12 facing the impeller 9.

[0040] In this embodiment, since an independent rear guard plate 12 is designed inside a part of the pump body 1, the rear guard plate 12 isolates the pump cover 2 from the impeller 9. The rear cutting portion 11 set on the pump cover 2 cannot achieve the cutting of the obstruction. Therefore, the side wall of the rear guard plate 12 facing the impeller 9 is set as the cutting wall 10, and the rear cutting portion 11 is set on the rear guard plate 12 to ensure that the cutting wall 10 and the side of the impeller 9 away from the feed port 6 are relatively set to ensure the effectiveness of the rear cutting portion 11.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A pulping process pump, comprising a pump body (1), a pump cover (2), a pump shaft (3), a bearing frame (4) and a bearing (5), wherein the pump body (1) has a feed inlet (6) and a discharge port (7), wherein the pump body (1) has an impeller chamber (8) communicating with the feed inlet (6) and the discharge port (7), wherein an impeller (9) is rotatably arranged in the impeller chamber (8); the pump cover (2) is mounted on the pump body (1), the bearing frame (4) is mounted on a side of the pump body (1) away from the feed inlet (6), the pump shaft (3) is rotatably mounted in the bearing frame (4) via the bearing (5), and an end of the pump shaft (3) passes through the pump cover (2) and is fixedly connected to the axis of the impeller (9); It is characterized in that: The side wall of the impeller chamber (8) includes a cutting wall (10), the cutting wall (10) is located on the side of the impeller (9) facing away from the feed port (6) and is arranged opposite to the impeller (9), and the side wall of the cutting wall (10) facing the impeller (9) is provided with a rear cutting portion (11).

2. The pulping process pump according to claim 1, wherein: The pump cover (2) is located on a side of the impeller (9) facing away from the feed inlet (6), and the cutting wall (10) is a side wall of the pump cover (2) facing the impeller (9).

3. The pulping process pump according to claim 1, characterized in that: The inner wall of the pump body (1) is provided with a rear guard plate (12), the rear guard plate (12) being located on a side of the impeller (9) facing away from the feed inlet (6), and the cutting wall (10) being a side wall of the rear guard plate (12) facing the impeller (9).

4. The pulping process pump according to claim 2 or 3, characterized in that: The rear cutting portion (11) extends in the radial direction of the impeller (9), and the end of the rear cutting portion (11) away from the axis of the impeller (9) is an open end. There are a plurality of rear cutting portions (11), and the plurality of rear cutting portions (11) are evenly arranged around the axis of the cutting wall (10).

5. The pulping process pump according to claim 1, characterized in that: A front guard plate (13) is installed on the inner wall of the pump body (1), and the front guard plate (13) is arranged on a side of the impeller (9) facing the feed inlet (6). The front guard plate (13) is provided with a front cutting portion (14) facing the impeller (9).

6. The pulping process pump according to claim 5, wherein: The front guard plate (13) is annular, comprising an annular plate surface (15) and a convex edge (16) located at the inner edge of the annular plate surface (15); the convex edge (16) bends and extends in the direction of the feed port (6), and the front cutting portion (14) is located on the inner wall of the convex edge (16).

7. The pulping process pump according to claim 6, wherein: The front cutting portion (14) extends along the axial direction of the front guard plate (13), and the end of the front cutting portion (14) away from the feed port (6) is an open end.

8. The pulping process pump according to claim 6, wherein: There are a plurality of the front cutting portions (14), and the plurality of the front cutting portions (14) are evenly arranged around the axis of the front guard plate (13).

9. The pulping process pump according to claim 5, characterized in that: It also includes an adjusting bolt (17), wherein the adjusting bolt (17) is passed through the pump body (1) from the outside of the pump body (1) and is screwed onto the front guard plate (13).

10. The pulping process pump according to claim 5, wherein: The front cutting portion (14) and the rear cutting portion (11) are cutting grooves or cutting convex edges.

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