Paper pulp conveying mechanism of mixed-flow type paper pulp pump

Abstract

The utility model discloses a paper pulp conveying mechanism of a mixed-flow type paper pulp pump, which relates to the technical field of paper pulp conveying and comprises the mixed-flow pump, an input pipe is fixedly mounted at the input end of the mixed-flow pump, an output pipe is fixedly mounted at the output end of the mixed-flow pump, and a protection mechanism is arranged on the upper portion of the input pipe and used for protecting the output pipe. Part of paper pulp liquid enters the pressure box under the action of pressure difference to push an internal piston to move upwards, the piston compresses a buffering spring through a buffering rod at the top end of the piston, first-stage buffering is conducted on impact force through elastic potential energy of the spring, and meanwhile the piston moves upwards to drive a sliding block to slide outwards along a sliding rod through a driving connecting rod; and then the driving springs at the two ends are compressed to form second-stage elastic buffering, so that sudden pressure change is prevented from directly acting on the pipeline and the pump body, the risks of pipe explosion, leakage and equipment damage are remarkably reduced, and the stability and durability of the whole conveying system are improved.

Description

Technical Field

[0001] This utility model relates to the field of pulp conveying technology, specifically to a pulp conveying mechanism for a mixed-flow pulp pump. Background Technology

[0002] In the field of pulp production and transportation, mixed-flow pulp pumps are one of the core pieces of equipment, undertaking the critical task of efficiently transporting high-viscosity, particulate pulp from the raw material pool or upstream process to downstream processes (such as paper machines, bleaching towers, etc.). In actual operation, when fluids such as pulp flow in pipelines, the sudden start-up and shutdown of the pump, the rapid opening and closing of valves, or sudden changes in operating conditions can cause a sharp change in flow velocity, which in turn causes a large fluctuation in fluid pressure (instantaneous rise or fall), a phenomenon known as water hammer effect. This can lead to problems such as pipeline vibration, bursting, and wear of equipment seals.

[0003] Referring to the patent document: Patent Publication No. CN209724688U, Patent Publication Date 2019-12-03, a pulp pump is disclosed; comprising a bearing housing; a pump shaft passing through the bearing housing; a pump cover connected to the bearing housing; a sealing structure connected between the pump cover and the pump shaft; a first impeller connected to the pump shaft and clearance-fitted with the pump cover; a second impeller connected to the pump shaft and clearance-fitted with the first impeller; a locking nut connected to the pump shaft for pressing the second impeller; and a pump body connected to the pump cover for use with the second impeller to transport pulp; a first cavity is formed between the pump cover and the first impeller; a second cavity is formed between the pump cover, the first impeller, and the sealing structure; the first cavity and the second cavity are perpendicularly arranged when projected from the front to the back plane; thereby overcoming the technical problem of poor sealing effect of a single sealing structure, achieving a good sealing effect, and having strong practicality.

[0004] Based on the search of patent numbers and the shortcomings of existing technologies, the following was found:

[0005] Traditional pulp conveying mechanisms are mostly equipped with simple water hammer protection devices such as buffer tanks or check valves, which have poor buffering or pressure relief effects and cannot effectively cope with the impact of high-frequency impacts. This leads to unstable pulp flow rate and large pressure fluctuations in the pipeline, which may cause sedimentation or cavitation in local areas, affecting the continuity and uniformity of conveying. In addition, they lack dynamic adjustment capabilities. When the water hammer pressure exceeds the design threshold (such as abnormal pump start-up or pipeline blockage), they cannot automatically detect and control the start and stop of the mixed flow pump, which can easily lead to equipment damage or pipeline blockage.

[0006] Therefore, this utility model provides a pulp conveying mechanism for a mixed-flow pulp pump. Utility Model Content

[0007] To address the problems of traditional pulp conveying mechanisms having simple protective devices, lacking dynamic adjustment, and prone to equipment damage or pipeline blockage due to large pressure fluctuations, the purpose of this utility model is to provide a pulp conveying mechanism for a mixed-flow pulp pump.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a pulp conveying mechanism for a mixed-flow pulp pump, comprising a mixed-flow pump, an input pipe fixedly installed at the input end of the mixed-flow pump, an output pipe fixedly installed at the output end of the mixed-flow pump, and a protective mechanism provided on the upper part of the input pipe for protecting the output pipe, the protective mechanism comprising:

[0009] The water hammer regulating assembly includes a pressure box fixedly installed on the upper part of the input pipe, and the lower part of the output pipe fixedly installed on one side of the pressure box. A piston is slidably mounted inside the pressure box. A sliding rod is fixedly installed on the upper part of the pressure box. Two symmetrically distributed sliding blocks are slidably mounted on the upper part of the sliding rod. Both ends of the sliding rod are fitted with drive springs. One end of the two drive springs is fixedly installed on one side of the sliding block, and the other end of the two drive springs is fixedly installed on the upper part of the pressure box. Drive connecting rods are movably mounted on the lower part of the two sliding blocks. The lower parts of the two drive connecting rods are movably mounted on the middle of the top of the piston. Four evenly distributed sleeves are fixedly installed on the upper surface of the inside of the pressure box.

[0010] The control component, located at the top of the inlet pipe, is used to control the water flow out of the pressure tank.

[0011] Preferably, the control component includes a check valve fixedly installed on the upper part of the input pipe, an electric shut-off valve fixedly installed on one side of the output pipe, and a control panel fixedly installed on the upper side of the pressure box, wherein the control panel integrates a control module electrically connected to the drive motor of the electric shut-off valve.

[0012] Preferably, the water hammer adjusting assembly further includes buffer rods slidably locked in the middle of the sleeve, with rubber bases fixedly installed at the bottom ends of the four buffer rods, the bottom ends of the four rubber bases fixedly installed at the top ends of the piston, buffer springs fixedly installed at the top ends of the four buffer rods, and the top ends of the four buffer springs fixedly installed on the inner upper surface of the sleeve.

[0013] Preferably, a pressure regulating valve is fixedly installed at the center of the top surface of the pressure box via a flange and bolt assembly, and the electric actuator of the pressure regulating valve is electrically connected to the control panel via a shielded cable.

[0014] Preferably, a pressure sensor is fixedly embedded in the middle of the bottom of each of the four rubber bases. The pressure sensor is connected to the control panel via a signal cable. The control panel can receive and analyze the data collected by the four pressure sensors.

[0015] Preferably, multiple sets of equally spaced limiting blocks are fixedly installed inside the output pipe, and the limiting blocks are used to block the instantaneous flow rate of water.

[0016] Beneficial effects

[0017] This invention provides a pulp conveying mechanism for a mixed-flow pulp pump. Compared with the prior art, it has the following advantages:

[0018] 1. This application utilizes the pressure difference to allow a portion of the pulp liquid to enter the pressure chamber, pushing the internal piston upward. The piston compresses the buffer spring through the buffer rod at its top, using the elastic potential energy of the spring to perform the first stage of buffering against the impact force. Simultaneously, the upward movement of the piston also drives the sliding block to slide outward along the sliding rod via the drive linkage, thereby compressing the drive springs at both ends and forming the second stage of elastic buffering. This prevents sudden pressure changes from directly acting on the pipeline and pump body, thus significantly reducing the risk of pipe bursts, leaks, and equipment damage, and improving the stability and durability of the overall conveying system.

[0019] 2. This application uses a pressure sensor to collect real-time contact pressure data between the piston and the rubber base. When the pressure value exceeds a predetermined threshold, the control panel immediately stops the mixed flow pump to prevent pipe rupture due to excessive pressure. At the same time, during the start-up and operation of the mixed flow pump, the control panel precisely controls the opening and closing of the electric shut-off valve and the pressure regulating valve. Combined with the unidirectional conduction characteristic of the check valve, the flow direction and flow rate of the pulp liquid are reasonably adjusted to achieve dynamic balance control of the pressure in the pressure tank and improve the working efficiency of the entire conveying mechanism. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the water hammer adjustment component of this utility model.

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the sleeve of this utility model.

[0024] In the diagram: 1. Mixed-flow pump; 11. Input pipe; 12. Output pipe; 13. Limit block; 2. Protective mechanism; 21. Water hammer adjustment assembly; 211. Pressure tank; 212. Pressure regulating valve; 213. Control panel; 214. Piston; 215. Sliding rod; 2151. Sliding block; 216. Drive linkage; 217. Drive spring; 218. Sleeve; 2181. Buffer rod; 2182. Buffer spring; 219. Rubber base; 2191. Pressure sensor; 22. Control assembly; 221. Check valve; 222. Electric shut-off valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-4 This utility model provides a technical solution: a pulp conveying mechanism for a mixed-flow pulp pump, including a mixed-flow pump 1, an input pipe 11 fixedly installed at the input end of the mixed-flow pump 1, an output pipe 12 fixedly installed at the output end of the mixed-flow pump 1, and a protective mechanism 2 provided on the upper part of the input pipe 11 for protecting the output pipe 12. The protective mechanism 2 includes:

[0027] The water hammer adjustment assembly 21 includes a pressure box 211 fixedly installed on the upper part of the input pipe 11, and the lower part of the output pipe 12 fixedly installed on one side of the pressure box 211. A piston 214 is slidably mounted inside the pressure box 211. An O-ring is provided on the outer side of the piston 214 to ensure tight contact with the inner wall of the pressure box 211. A sliding rod 215 is fixedly installed on the upper part of the pressure box 211. Two symmetrically distributed sliding blocks 2151 are slidably mounted on the upper part of the sliding rod 215. Both ends of the sliding rod 215 are fitted with drive springs 217. One end of the two drive springs 217 is fixedly installed on one side of the sliding block 2151, and the other end of the two drive springs 217 is fixedly installed on the upper part of the pressure box 211. A drive connecting rod 216 is movably mounted on the lower part of the two sliding blocks 2151. The lower part of the two drive connecting rods 216 is movably mounted on the middle of the top of the piston 214. Four evenly distributed sleeves 218 are fixedly installed on the upper inner surface of the pressure box 211.

[0028] The control component 22 is located at the top of the input pipe 11 and is used to control the water flow out of the pressure tank 211.

[0029] The control component 22 includes a check valve 221 fixedly installed on the upper part of the input pipe 11. The check valve 221 adopts an inclined valve disc structure and the valve disc surface is coated with a wear-resistant coating, which can effectively prevent pulp impurities from getting stuck and ensure rapid sealing during backflow, so that the pulp flow direction is from the pulp in the pressure tank 211 to the pulp in the input pipe 11. An electric shut-off valve 222 is fixedly installed on one side of the output pipe 12. A control panel 213 is fixedly installed on the upper side of the pressure tank 211, and the control panel 213 integrates a control module that is electrically connected to the drive motor of the electric shut-off valve 222.

[0030] The water hammer adjustment assembly 21 also includes buffer rods 2181 slidably locked in the middle of the sleeve 218. Rubber bases 219 are fixedly installed at the bottom of each of the four buffer rods 2181. The rubber bases 219 are made of nitrile rubber and have an embedded metal frame to enhance structural strength, effectively absorbing vibration energy during piston 214 movement. The buffer rods 2181 are made of hollow stainless steel tubing, reducing equipment weight while ensuring their strength during use. The bottom of each of the four rubber bases 219 is fixedly installed at the top of the piston 214, and buffer springs 2182 are fixedly installed at the top of each of the four buffer rods 2181. The tops of the four buffer springs 2182 are fixedly installed on the inner upper surface of the sleeve 218. Two symmetrically distributed grooves are formed on the inner wall of the sleeve 218, and corresponding locking blocks are provided on the buffer rods 2181 to limit their movement, ensuring stable sliding within the sleeve 218 without rotation.

[0031] A pressure regulating valve 212 is fixedly installed at the center of the top surface of the pressure box 211 by means of a flange and bolts. The electric actuator of the pressure regulating valve 212 is electrically connected to the control panel 213 through a shielded cable. The pressure regulating valve 212 is controlled by the control panel 213. When the mixed flow pump 1 is started, its pressure regulating valve 212 opens quickly to ensure the pressure is balanced in the pressure box 211, so that the pulp liquid can enter the pressure box 211.

[0032] Pressure sensors 2191 are fixedly embedded in the middle of the bottom of each of the four rubber bases 219. The pressure sensors 2191 are connected to the control panel 213 via signal cables. The control panel 213 can receive and analyze the data collected by the four pressure sensors 2191. It can accurately collect the contact pressure between the piston 214 and the rubber base 219 in real time and detect the force on the piston 214. When the pressure value exceeds the predetermined threshold, the control panel 213 directly stops the operation of the mixing pump 1 to prevent the pulp liquid from being under excessive pressure during transportation, which could cause the pipe to burst.

[0033] Multiple sets of equally spaced limiting blocks 13 are fixedly installed inside the output pipe 12. The limiting blocks 13 are used to block the instantaneous flow velocity of water. The limiting blocks 13 adopt a streamlined design with a 30° inclination angle on the front surface, which can effectively disperse the impact force of pulp flow.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] During operation, the mixed-flow pump 1 starts, generating centrifugal force and axial thrust through impeller rotation. This draws in and pressurizes the pulp from the input pipe 11, discharging it through the output pipe 12. At the moment the mixed-flow pump 1 starts, the control panel 213 opens the electric shut-off valve 222 and the pressure regulating valve 212. Under the limit of the limit block 13, the rapidly flowing pulp is partially blocked by the pressure difference, causing some pulp to enter the pressure tank 211 through the electric shut-off valve 222. This reduces the instantaneous impact of the pulp in the input pipe 11, thereby reducing the water hammer effect. At this time, under the influence of pressure, the piston 214 moves upward, causing the buffer rod... 2181 moves upward, squeezing the buffer spring 2182. The buffer spring 2182 buffers the piston 214 through its elastic potential energy. At the same time, driven by the drive link 216, the two sliding blocks 2151 move to the sides, squeezing the drive spring 217. The drive spring 217 also buffers the piston 214 through its elastic force. When the water flow becomes stable, the piston 214 gradually moves downward under the synchronous force of the drive spring 217 and the buffer spring 2182. This causes the pulp liquid in the pressure tank 211 to flow into the input pipe 11 through the check valve 221, thereby discharging the pulp liquid in the pressure tank 211.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulp conveying mechanism for a mixed-flow pulp pump, comprising a mixed-flow pump (1), characterized in that: An input pipe (11) is fixedly installed at the input end of the mixed-flow pump (1), and an output pipe (12) is fixedly installed at the output end of the mixed-flow pump (1). A protective mechanism (2) is provided on the upper part of the input pipe (11) to protect the output pipe (12). The protective mechanism (2) includes: The water hammer regulating assembly (21) includes a pressure box (211) fixedly installed on the upper part of the input pipe (11), and the lower part of the output pipe (12) fixedly installed on one side of the pressure box (211). The pressure box (211) has a piston (214) slidingly mounted inside. A sliding rod (215) is fixedly mounted on the upper part of the pressure box (211). The upper part of the sliding rod (215) has two symmetrically distributed sliding blocks (2151). Both ends of the sliding rod (215) are fitted with drive springs. 217), one end of the two drive springs (217) is fixedly installed on one side of the sliding block (2151), the other end of the two drive springs (217) is fixedly installed on the upper part of the pressure box (211), the lower part of the two sliding blocks (2151) is movably installed with drive connecting rods (216), the lower part of the two drive connecting rods (216) is movably installed on the middle of the top of the piston (214), and four evenly distributed sleeves (218) are fixedly installed on the inner upper surface of the pressure box (211). The control component (22) is located on the upper part of the input pipe (11) and is used to control the water flow out of the pressure tank (211).

2. The pulp conveying mechanism of a mixed-flow pulp pump according to claim 1, characterized in that: The control component (22) includes a check valve (221) fixedly installed on the upper part of the input pipe (11), an electric shut-off valve (222) fixedly installed on one side of the output pipe (12), a control panel (213) fixedly installed on the upper side of the pressure box (211), and the control panel (213) integrates a control module electrically connected to the drive motor of the electric shut-off valve (222).

3. The pulp conveying mechanism of a mixed-flow pulp pump according to claim 1, characterized in that: The water hammer adjustment assembly (21) also includes a buffer rod (2181) that is slidably locked in the middle of the sleeve (218). The bottom ends of the four buffer rods (2181) are all fixedly installed with rubber bases (219). The bottom ends of the four rubber bases (219) are all fixedly installed with the top of the piston (214). The top ends of the four buffer rods (2181) are all fixedly installed with buffer springs (2182). The top ends of the four buffer springs (2182) are fixedly installed on the inner upper surface of the sleeve (218).

4. The pulp conveying mechanism of a mixed-flow pulp pump according to claim 2, characterized in that: A pressure regulating valve (212) is fixedly installed at the center of the top surface of the pressure box (211) by means of a flange and bolts. The electric actuator of the pressure regulating valve (212) is electrically connected to the control panel (213) through a shielded cable.

5. The pulp conveying mechanism of a mixed-flow pulp pump according to claim 3, characterized in that: Pressure sensors (2191) are fixedly embedded in the middle of the bottom of each of the four rubber bases (219). The pressure sensors (2191) are connected to the control panel (213) via signal cables. The control panel (213) can receive and analyze the data collected by the four pressure sensors (2191).

6. The pulp conveying mechanism of a mixed-flow pulp pump according to claim 1, characterized in that: The output pipe (12) is fixedly installed with multiple sets of equally spaced limiting blocks (13), which are used to block the instantaneous flow rate of water.

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