Device for avoiding cavitation of discharge pump

Abstract

The utility model relates to the technical field of paper pulp processing, in particular to a device for avoiding cavitation of a discharge pump, which comprises a hydraulic slag removal machine connected with a slag discharge pipe; an accepted pulp pipe is connected between the discharging pump and the hydraulic slag removal machine; the check valve is mounted on the accepted stock pipe, and the at least one check valve is arranged close to the communication position of the hydraulic slag removal machine and the accepted stock pipe; the non-return valve is installed on the accepted pulp pipe, a backflow route of water and pulp in the accepted pulp pipe can be blocked before impurities are discharged through the slag discharging pipe, then the backflow phenomenon in the accepted pulp pipe is avoided, and therefore the possibility that air enters the accepted pulp pipe is reduced; and in the deslagging process, the possibility of cavitation of the discharging pump after air enters due to backflow of water and slurry in the accepted slurry pipe is reduced.

Description

Technical Field

[0001] This application relates to the field of pulp processing technology, and in particular to a device for preventing cavitation in unloading pumps. Background Technology

[0002] With increasing environmental awareness, some reusable resources, such as paper, are being recycled and reused through waste paper pulping. Waste paper pulping is an environmentally friendly and resource-efficient process that reduces forest resource consumption and environmental pollution by recycling waste paper into pulp. The process includes waste paper collection, sorting, shredding, deinking, screening and purification, bleaching (optional), and concentration.

[0003] In the pulping section, waste paper is first fed into a vertical hydraulic pulper for pulping. During pulping, impurities and debris carried in the waste paper enter the settling well along with the fiber pulp through a connector. The mixture of impurities and pulp above the settling well enters the hydraulic slag remover through the upper inlet pipe for cleaning. Useful fibers are washed away and sent to the discharge pump inlet for reuse through the good pulp pipe. Useless impurities are blocked at the screen plate. When the hydraulic slag remover is full of impurities, the discharge pipe is opened to discharge the impurities into the drainage ditch. However, during the discharge process, water and pulp in the good pulp pipe may flow back into the hydraulic slag remover due to the discharge of impurities. At this time, there is a gap in the upper part of the good pulp pipe, and outside air enters. During the next pulping cycle, the air in the good pulp pipe will enter the discharge pump, causing cavitation in the discharge pump and resulting in a significant decrease in the pumping efficiency of the discharge pump. Utility Model Content

[0004] In order to reduce the possibility of water and slurry backflow in the slurry pipe during the slag discharge process, which could lead to air ingress and cause cavitation in the unloading pump, this application provides a device to prevent cavitation in the unloading pump.

[0005] The device for preventing cavitation in a discharge pump provided in this application adopts the following technical solution:

[0006] A device for preventing cavitation in a discharge pump, comprising:

[0007] A hydraulic slag remover, wherein a slag discharge pipe is connected to the hydraulic slag remover;

[0008] A discharge pump is provided, and a slurry pipe is connected between the discharge pump and the hydraulic slag remover.

[0009] At least one check valve is installed on the slurry pipe, and at least one of the check valves is located near the connection between the hydraulic sludge remover and the slurry pipe.

[0010] By adopting the above technical solution, the device designed to prevent cavitation of the unloading pump can block the backflow path of water and slurry in the slurry pipe before impurities are discharged through the slag discharge pipe by installing a check valve on the slurry pipe. This prevents backflow in the slurry pipe and reduces the possibility of air entering the slurry pipe. During the slag discharge process, the backflow of water and slurry in the slurry pipe is reduced, which may lead to air entering and causing cavitation in the unloading pump.

[0011] In one specific implementation, the number of check valves is two, and the two check valves are respectively located near the hydraulic slag remover and the unloading pump.

[0012] By adopting the above technical solution, the two check valves designed to be located near the hydraulic slag remover and the unloading pump respectively can minimize the backflow of water and slurry.

[0013] In one specific implementation, a one-way vent valve is connected to the slurry pipe, and the one-way vent valve is located between the two check valves.

[0014] By adopting the above technical solution, the designed one-way exhaust valve can, when air enters the slurry pipe, close the check valve near the unloading pump and then discharge the air in the slurry pipe through the one-way exhaust valve, thereby reducing the possibility of cavitation in the unloading pump.

[0015] In one specific implementation scheme, a filter cage is connected inside the pulp pipe, the filter cage and the pulp pipe form an exhaust chamber, and one end of the one-way exhaust valve is connected to the exhaust chamber.

[0016] By adopting the above technical solution, the designed filter cage can reduce the possibility of the one-way exhaust valve being blocked by the slurry while expelling air from the slurry pipe.

[0017] In one specific implementation, the good slurry tube includes:

[0018] A vertical section, which is connected to the hydraulic slag remover and is vertically positioned.

[0019] The horizontal flow section is connected to the end of the vertical section away from the hydraulic sludge removal machine.

[0020] By adopting the above technical solution, the designed slurry pipe, which includes vertical and horizontal sections, can reduce the backflow of water and slurry through the vertical section, thereby reducing the possibility of air entering.

[0021] In one specific implementation, at least one undulating region is formed on the advection section, the undulating region being located between the lowest point and the highest point of the vertical section.

[0022] By adopting the above technical solution, the designed undulating zone can form a structure similar to a U-shaped water plug inside the slurry pipe, thereby making the height of the water and slurry mixture in the vertical section as close as possible to the top of the vertical section, and further reducing the possibility of air entering the slurry pipe.

[0023] In one specific implementation scheme, the slurry inlet of the hydraulic slag remover is connected to a slurry inlet pipe, and the other end of the slurry inlet pipe is connected to a sedimentation well.

[0024] By adopting the above technical solution, the designed sedimentation well and slurry inlet pipe can deliver waste paper pulp into the hydraulic slag remover.

[0025] In one specific implementation, an automatic control valve is connected to the slag discharge pipe.

[0026] By adopting the above technical solution, the designed automatic control valve can control the opening and closing of the slag discharge pipe.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The designed device to prevent cavitation in the unloading pump is achieved by installing a check valve on the slurry pipe. This seals the backflow path of water and slurry in the slurry pipe before impurities are discharged through the slag discharge pipe, thereby preventing backflow in the slurry pipe and reducing the possibility of air entering the slurry pipe. During the slag discharge process, the backflow of water and slurry in the slurry pipe is reduced, which may lead to air entering and causing cavitation in the unloading pump.

[0029] 2. The designed device to prevent cavitation in the unloading pump uses a one-way vent valve. When air enters the slurry pipe, the check valve near the unloading pump is closed, and the air in the slurry pipe is then discharged through the one-way vent valve, thereby reducing the possibility of cavitation in the unloading pump.

[0030] 3. The designed device to prevent cavitation in the unloading pump can form a U-shaped water plug-like structure inside the slurry pipe through the undulating zone, thereby making the height of the water and slurry mixture in the vertical section as close as possible to the top of the vertical section, and further reducing the possibility of air entering the slurry pipe. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the device for preventing cavitation of the unloading pump according to an embodiment of this application.

[0032] Figure 2 yes Figure 1 The enlarged view in section A is mainly used to show the connection structure of the hydraulic slag remover, the vertical section, and the slag discharge pipe.

[0033] Figure 3 yes Figure 1The enlarged view in section B is mainly used to show the connection structure of the advection section, the one-way exhaust valve, and the filter cage.

[0034] Explanation of reference numerals in the attached drawings: 1. Hydraulic slag remover; 2. Slag discharge pipe; 21. Automatic control valve; 3. Unloading pump; 4. Slurry pipe; 41. Vertical section; 42. Horizontal section; 43. Undulating zone; 5. Check valve; 6. One-way exhaust valve; 7. Filter cage; 8. Slurry inlet pipe; 9. Sedimentation well. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0036] This application discloses a device for preventing cavitation in unloading pumps.

[0037] Reference Figure 1 and Figure 2 A device for preventing cavitation in a discharge pump includes a hydraulic slag cleaner 1 and a discharge pump 3. A slag discharge pipe 2 is connected to the flange of the hydraulic slag cleaner 1. The slag discharge pipe 2 is connected to the front cavity of the screen plate inside the hydraulic slag cleaner 1. After the front space is full of impurities, the impurities are discharged through the slag discharge pipe 2. To facilitate the control of the opening and closing state of the slag discharge pipe 2, an automatic control valve 21 is connected to the flange of the slag discharge pipe 2. A slurry pipe 4 is connected to the discharge pump 3 and the hydraulic slag cleaner 1 through a flange. The inner cavity of the slurry pipe 4 is connected to the rear cavity of the screen plate inside the hydraulic slag cleaner 1.

[0038] Reference Figure 1 and Figure 2 In addition, a slurry inlet pipe 8 is connected to the flange at the slurry inlet of the hydraulic slurry cleaner 1, and a settling well 9 is connected to the flange at the other end of the slurry inlet pipe 8 away from the hydraulic slurry cleaner 1; waste paper pulp can be sent into the hydraulic slurry cleaner 1 through the settling well 9 and the slurry inlet pipe 8.

[0039] Reference Figure 1 Specifically, the slurry pipe 4 includes a vertical section 41 and a horizontal section 42. One end of the vertical section 41 is connected to the hydraulic slag remover 1 via a flange, and the vertical section 41 is set vertically. One end of the horizontal section 42 is connected to the flange at the end of the vertical section 41 away from the hydraulic slag remover 1, and the other end of the horizontal section 42 is connected to the flange at the inlet of the unloading pump 3. The slurry pipe 4, including the vertical section 41 and the horizontal section 42, can reduce the backflow of water and slurry through the vertical section 41, thereby reducing the possibility of air entering.

[0040] Reference Figure 1 and Figure 2Furthermore, at least one undulating region 43 is formed on the horizontal section 42, which is located between the lowest and highest points of the vertical section 41; thereby forming a U-shaped water plug-like structure in the slurry pipe 4, so that the height of the water and slurry mixture in the vertical section 41 is as close as possible to the top of the vertical section 41, thereby further reducing the possibility of air entering the slurry pipe 4.

[0041] Reference Figure 2 In order to reduce the backflow of water and slurry in the slurry pipe 4 during the discharge of impurities, and thus reduce the possibility of air entering the slurry pipe 4, at least one check valve 5 is also included. The check valve 5 is installed on the slurry pipe 4, and at least one check valve 5 is set near the connection between the hydraulic slag remover 1 and the slurry pipe 4 to minimize the backflow of water and slurry. By installing the check valve 5 on the slurry pipe 4, the backflow path of water and slurry in the slurry pipe 4 can be blocked before the impurities are discharged through the slag discharge pipe 2, thereby avoiding the backflow phenomenon in the slurry pipe 4 and reducing the possibility of air entering the slurry pipe 4.

[0042] Reference Figure 1 and Figure 2 Furthermore, there are two check valves 5, which are respectively located near the hydraulic slag remover 1 and the unloading pump 3. By setting the two check valves 5 near the hydraulic slag remover 1 and the unloading pump 3, the backflow of water and slurry can be avoided to the greatest extent.

[0043] Reference Figure 1 and 3 Furthermore, a one-way vent valve 6 is connected to the flange on the slurry pipe 4. The one-way vent valve 6 is located between two check valves 5. When air enters the slurry pipe 4, the check valve 5 near the unloading pump 3 is closed, and the air in the slurry pipe 4 is then discharged through the one-way vent valve 6, thereby reducing the possibility of cavitation in the unloading pump 3. In addition, a filter cage 7 is bolted inside the slurry pipe 4. The filter cage 7 and the slurry pipe 4 form an exhaust chamber, and one end of the one-way vent valve 6 is connected to the exhaust chamber. This can reduce the possibility of the one-way vent valve 6 being blocked by slurry while discharging air from the slurry pipe 4.

[0044] The implementation principle of the device for preventing cavitation of the unloading pump in this application embodiment is as follows: The conveyor belt sends waste paper into the hydraulic pulper for crushing. The crushed pulp and impurities enter the settling well 9 together. Then, the pulp and some impurities enter the hydraulic slag remover 1 through the pulp inlet pipe 8. Under the filtering action of the screen plate in the hydraulic slag remover 1, the impurities are retained in the front cavity of the screen plate in the hydraulic slag remover 1. The water and slurry pass through the screen plate and then enter the unloading pump 3 through the good pulp pipe 4. As the usage time increases, the impurities in the front cavity of the screen plate in the hydraulic slag remover 1 become full. At this time, the automatic control valve 21 is opened, and the impurities in the front cavity of the screen plate in the hydraulic slag remover 1 are discharged through the slag discharge pipe 2. During the slag discharge process, due to the presence of the check valve 5 and the U-shaped water plug structure, the backflow of water and slurry in the good pulp pipe 4 is less, so that air may enter and cause cavitation of the unloading pump 3.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for preventing cavitation in a discharge pump, characterized in that: include: A hydraulic slag remover (1), wherein a slag discharge pipe (2) is connected to the hydraulic slag remover (1); A discharge pump (3) is provided, and a slurry pipe (4) is connected between the discharge pump (3) and the hydraulic slag remover (1); At least one check valve (5) is installed on the slurry pipe (4), and at least one of the check valves (5) is located near the connection between the hydraulic slag remover (1) and the slurry pipe (4).

2. The device for preventing cavitation in a discharge pump according to claim 1, characterized in that: There are two check valves (5), and the two check valves (5) are respectively located near the hydraulic slag remover (1) and the unloading pump (3).

3. The device for preventing cavitation in the unloading pump according to claim 2, characterized in that: A one-way vent valve (6) is connected to the slurry pipe (4), and the one-way vent valve (6) is located between the two check valves (5).

4. The device for preventing cavitation in a discharge pump according to claim 3, characterized in that: A filter cage (7) is connected inside the pulp pipe (4). The filter cage (7) and the pulp pipe (4) form an exhaust chamber, and one end of the one-way exhaust valve (6) is connected to the exhaust chamber.

5. The device for preventing cavitation in a discharge pump according to claim 1, characterized in that: The good slurry tube (4) includes: Vertical section (41), the vertical section (41) is connected to the hydraulic slag remover (1), and the vertical section (41) is set vertically; The horizontal flow section (42) is connected to the end of the vertical section (41) away from the hydraulic slag remover (1).

6. The device for preventing cavitation in a discharge pump according to claim 5, characterized in that: At least one undulating region (43) is formed on the horizontal section (42), the undulating region (43) being located between the lowest point and the highest point of the vertical section (41).

7. The device for preventing cavitation in a discharge pump according to claim 1, characterized in that: The hydraulic slag remover (1) has a slurry inlet connected to a slurry inlet pipe (8), and the other end of the slurry inlet pipe (8) is connected to a sedimentation well (9).

8. The device for preventing cavitation in a discharge pump according to claim 1, characterized in that: An automatic control valve (21) is connected to the slag discharge pipe (2).

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