A vertical filter feeding pipe damping device

Abstract

The utility model discloses a vertical filter feeder pipe damping device, including the air inlet pipe of setting in the feeder pipe and being close to the feed valve, air inlet pipe one end is connected the feeder pipe, the other end sealed connection U -shaped pipe, U -shaped pipe free open end is exposed to the washing liquid liquid level above the washing liquid tank, and the curved lower section is soaked in the washing liquid and is provided with micropore, is equipped with the one-way valve of being close to U -shaped pipe and the normally open valve of being close to the feeder pipe on the air inlet pipe. After feeding is completed, the feeder pipe forms vacuum, and the one-way valve opens, and air is rapidly entered through U -shaped pipe and eliminates vacuum, and simultaneously drives a small amount of washing liquid to clean the pipeline, and after air pressure balance, the washing liquid is supplemented automatically through the micropore. The device has small air flow resistance, stable cleaning, convenient maintenance, effectively prolongs the service life of equipment, and has strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation technology, specifically to a shock-absorbing device for the feed pipe of a vertical filter press. Background Technology

[0002] Vertical filter presses are commonly used solid-liquid separation equipment in industrial production. During operation, materials are fed into the filter press body through a feed pipe. The feed pipe is equipped with a feed valve and a feed pump. After feeding is completed, the feed pump stops and the feed valve closes, and the material in the pipe returns to the material tank by gravity. However, because the upper part of the feed pipe is closed, some material is retained under atmospheric pressure, forming a vacuum. During the next feeding cycle, the retained material surges rapidly upward under the combined action of "positive pressure at the bottom and negative pressure at the top," impacting the feed pipe and transmitting vibrations to the feed valve and feed pump. This can easily lead to pipe displacement, equipment damage, and affect production stability.

[0003] Utility model patent CN204261404U discloses a vibration damping device for the feed pipe of a vertical filter press. It includes an air inlet pipe with a one-way valve on the feed pipe, through which air is drawn in to eliminate vacuum. A cleaning liquid tank is also included to clean the air inlet pipe and the one-way valve using the cleaning liquid. However, in practical applications, there are still shortcomings: the existing solution relies solely on the contact between the air inlet of the air pipe and the surface of the cleaning liquid for cleaning. The liquid level is prone to fluctuations due to evaporation and changes in the intake volume—if the liquid level is too high, a large amount of cleaning liquid will flood into the feed pipe, blocking air from entering and failing to eliminate vibration, and may also dilute the material; if the liquid level is too low, the air inlet pipe and the one-way valve cannot be thoroughly cleaned, and residual material can easily cause the one-way valve core to become stuck. Utility Model Content

[0004] To overcome the defects or one of the defects of the existing technology, this utility model provides a vertical filter press feed pipe vibration damping device with low airflow resistance, stable cleaning effect, reliable sealing and easy maintenance. The technical solution adopted is as follows: A vibration damping device for the feed pipe of a vertical filter press includes an air inlet pipe installed on the feed pipe of the vertical filter press. The axis of the air inlet pipe is horizontal, located below and close to the feed valve of the vertical filter press. The air inlet pipe is equipped with a one-way valve and a normally open valve. One end of the air inlet pipe is connected to the feed pipe. Unlike the prior art, the other end of the air inlet pipe is sealed with a U-shaped tube. The end of the U-shaped tube away from the air inlet pipe is a free open end, which is set upward and exposed above the liquid surface of the cleaning liquid in the cleaning liquid tank. The lower curved section of the U-shaped tube is immersed in the cleaning liquid, and at least one microhole communicating with the inner cavity of the U-shaped tube is opened on the tube wall of the lower curved section. The one-way valve is installed on the section of the air inlet pipe close to the U-shaped tube.

[0005] Furthermore, the pore size of the micropore is 0.5-2 mm.

[0006] Furthermore, 2-5 micropores are provided on the wall of the lower section of the U-shaped tube, and each micropore is evenly distributed along the circumference of the lower section of the U-shaped tube.

[0007] Furthermore, the highest point of the lower section of the U-shaped tube bend is not higher than the liquid level of the cleaning fluid in the cleaning fluid tank.

[0008] Furthermore, a filter screen is detachably connected to the free open end of the U-shaped tube, and the filter screen has a pore size of 5-10mm.

[0009] Furthermore, the cleaning solution in the cleaning solution tank is clean water or a special cleaning agent for materials processed by the vertical filter press.

[0010] Furthermore, the normally open valve is installed on the section of the air inlet pipe near the feed pipe, and the normally open valve is a ball valve.

[0011] Furthermore, the U-shaped tube is made of stainless steel or polytetrafluoroethylene.

[0012] Furthermore, the air intake pipe and the U-shaped pipe are sealed together by welding or flange connection.

[0013] Furthermore, the volume of the lower section of the U-shaped tube is 50-100 mL.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This invention replaces the traditional L-shaped connector assembly structure with a U-shaped tube, eliminating right-angle bends in the airflow path, resulting in smoother flow, significantly reducing air intake resistance, and enabling rapid air intake to eliminate the vacuum state in the feeding pipe. This effectively prevents material from surging up and impacting the pipe during the next feeding cycle, making the shock absorption effect more stable and reliable.

[0015] The microporous design of the lower section of the U-shaped tube allows the cleaning fluid to enter the tube stably. This prevents the fluid from obstructing airflow or diluting the material due to excessive flow, while also preventing insufficient cleaning due to insufficient flow. It can thoroughly remove residual material from the air inlet pipe and one-way valve, reduce the risk of valve core blockage, and ensure the long-term stable operation of components.

[0016] The one-way valve is located near the U-shaped tube. Together with the normally open valve located in the section of the air inlet pipe near the feed pipe, closing the normally open valve during maintenance can quickly block the pipeline, reducing the interference of residual material in the pipe on maintenance operations and making the maintenance process more convenient and efficient.

[0017] The overall structure continues the core connection relationship of the existing equipment, without the need to significantly modify the original pipeline layout. It has strong adaptability and low manufacturing cost. At the same time, with the help of internal and external air pressure balance and the structural characteristics of U-shaped tube, the cleaning fluid can automatically maintain a stable reserve, eliminating the need for additional liquid level control components. This further simplifies the structure, improves the reliability of equipment operation, and facilitates its promotion and application. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0019] 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.

[0020] The vertical filter press feed pipe vibration damping device disclosed in this utility model is fully compatible with the existing pipeline layout of vertical filter presses. Its core structure includes an air inlet pipe 17, a U-shaped pipe 23, a one-way valve 18, a normally open valve 22, a cleaning liquid tank 19, and supporting components. The connection relationship and working process of each part are as follows: I. Device Structural Details The air inlet pipe 17 is horizontally oriented and is installed on the feed pipe 6 of the vertical filter press, located below and adjacent to the feed valve 2, ensuring that air can quickly enter the vacuum area above the feed pipe 6. One end of the air inlet pipe 17 is connected to the feed pipe 6, and the other end is sealed and fixed to the U-shaped pipe 23 by welding or flange connection, with no air leakage gaps at the connection.

[0021] The U-shaped tube 23 is made of stainless steel or polytetrafluoroethylene, which has wear-resistant and corrosion-resistant properties and is suitable for various material environments processed by the filter press. The end of the U-shaped tube 23 away from the air inlet pipe 17 is a free open end, which is vertically set upward and completely exposed above the liquid surface 21 of the cleaning liquid 20 in the cleaning liquid tank 19, so as to avoid the liquid surface 21 being blocked by the liquid when it fluctuates. The lower curved section of the U-shaped tube 23 hangs down naturally and is immersed in the cleaning liquid 20. Multiple micropores 23-1 are evenly distributed on the tube wall of the lower curved section. The micropores 23-1 communicate with the inner cavity of the U-shaped tube 23, which can realize the stable penetration of the cleaning liquid 20.

[0022] A one-way valve 18 is installed on the section of the air inlet pipe 17 near the U-shaped tube 23. Its opening direction is the same as the direction in which air enters the feed pipe 6, allowing air to flow only from the U-shaped tube 23 to the feed pipe 6, preventing material in the feed pipe 6 from flowing back into the U-shaped tube 23. The normally open valve 22 is a ball valve, located on the section of the air inlet pipe 17 near the feed pipe 6. Under normal conditions, it remains fully open and does not obstruct airflow.

[0023] The cleaning fluid tank 19 is placed below the U-shaped tube 23. The tank contains clean water or a special cleaning agent for the materials processed by the filter press. The liquid level 21 should be just submerged in the lower bend of the U-shaped tube 23, and the highest point of the lower bend of the U-shaped tube 23 should not exceed the liquid level 21, ensuring that the cleaning fluid 20 can be naturally replenished when the air pressure is balanced. A filter screen is detachably connected to the free open end of the U-shaped tube 23 to prevent external impurities from entering the tube.

[0024] II. Detailed Work Process After feeding, the vacuum elimination stage occurs when the vertical filter press completes the feeding operation. Feed pump 3 stops running, and feed valve 2 closes. Under gravity, the material in feed pipe 6 flows back to material tank 4, creating a vacuum in the upper part of the pipe. The negative pressure generated by this vacuum pushes open check valve 18, allowing external air to enter from the free opening end of U-shaped tube 23, flowing through the inner cavity of U-shaped tube 23 and air inlet pipe 17 to feed pipe 6. Because U-shaped tube 23 is a continuous curved structure without right-angle bends, airflow is smooth, and resistance is significantly lower than traditional L-shaped joint structures. This allows for rapid influx into feed pipe 6, quickly balancing the air pressure inside the pipe, eliminating the vacuum state, and fundamentally preventing vibrations caused by material surging and impacting the pipe during the next feeding cycle. At the same time, when the air flows through the lower section of the U-shaped tube 23, it will carry a small amount of pre-stored cleaning fluid 20 into the air intake pipe 17 and the one-way valve 18, flushing the inner wall of the pipe and the valve core of the one-way valve 18, removing residual material particles, and preventing blockage after long-term use.

[0025] During the cleaning fluid replenishment stage after pressure balancing, once the vacuum in the feed pipe 6 is eliminated and the air pressure is balanced with the external atmospheric pressure, the one-way valve 18 automatically closes under its own reset structure, blocking the passage between the feed pipe 6 and the U-shaped tube 23. At this time, both the inside of the U-shaped tube 23 and the cleaning fluid tank 19 are under atmospheric pressure, and the internal and external air pressures are balanced. The cleaning fluid 20 in the cleaning fluid tank 19 will slowly seep into the tube through the micropores 23-1 in the lower bend of the U-shaped tube 23, replenishing the cleaning fluid 20 that was previously carried away by the air. Because the pore size of the micropores 23-1 is small, and the highest point of the lower bend of the U-shaped tube 23 is not higher than the liquid surface 21, the cleaning fluid 20 can only be filled to the level of the liquid surface 21, without excessive influx, always maintaining a quantitative reserve, preparing for the next cleaning action in the vacuum elimination stage.

[0026] During maintenance, when it is necessary to inspect the one-way valve 18 or the U-tube 23, closing the normally open valve 22 on the inlet pipe 17 will block the connection between the feed pipe 6 and the U-tube 23, preventing residual material in the feed pipe 6 from leaking or flowing into the U-tube 23. Because the one-way valve 18 is located near the U-tube 23 and the normally open valve 22 is located near the feed pipe 6, closing the normally open valve 22 results in a very small amount of material in the pipe section between the one-way valve 18 and the normally open valve 22, greatly simplifying the disassembly and maintenance process and reducing the impact on the overall operation of the filter press. After maintenance, reopening the normally open valve 22 will restore the unit to normal operation.

[0027] Through the above structural design and workflow, this device ensures rapid elimination of vacuum in the feed pipe 6 and stable vibration reduction, while achieving automatic quantitative control and convenient maintenance of the cleaning liquid 20. It effectively solves the problems of high airflow resistance, unstable cleaning effect, and cumbersome maintenance in the existing technology, and significantly improves the reliability and economy of the vertical filter press.

[0028] 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 vibration damping device for the feed pipe of a vertical filter press, comprising an air inlet pipe (17) disposed on the feed pipe (6) of a vertical filter press, wherein the axis of the air inlet pipe (17) is horizontal, located below and close to the feed valve (2) of the vertical filter press, the air inlet pipe (17) is provided with a one-way valve (18) and a normally open valve (22), and one end of the air inlet pipe (17) is connected to the feed pipe (6), characterized in that, The other end of the air inlet pipe (17) is sealed with a U-shaped pipe (23). The end of the U-shaped pipe (23) away from the air inlet pipe (17) is a free open end. The free open end is set upward and exposed above the liquid surface (21) of the cleaning liquid (20) in the cleaning liquid tank (19). The lower curved section of the U-shaped pipe (23) is immersed in the cleaning liquid (20), and at least one microhole (23-1) communicating with the inner cavity of the U-shaped pipe (23) is opened on the pipe wall of the lower curved section. The one-way valve (18) is set on the section of the air inlet pipe (17) near the U-shaped pipe (23).

2. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The pore size of the micropore (23-1) is 0.5-2 mm.

3. The vibration damping device for the feed pipe of a vertical filter press according to claim 1 or 2, characterized in that, The lower section of the U-shaped tube (23) has 2-5 micro-holes (23-1) on its wall, and each micro-hole (23-1) is evenly distributed along the circumference of the lower section of the U-shaped tube (23).

4. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The highest point of the lower section of the U-shaped tube (23) is not higher than the liquid level (21) of the cleaning fluid (20) in the cleaning fluid tank (19).

5. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, A filter screen is detachably connected to the free opening end of the U-shaped tube (23), and the pore size of the filter screen is 5-10mm.

6. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The cleaning solution (20) in the cleaning solution tank (19) is clean water or a special cleaning agent for materials processed by the vertical filter press.

7. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The normally open valve (22) is installed on the section of the air inlet pipe (17) near the feed pipe (6), and the normally open valve (22) is a ball valve.

8. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The U-shaped tube (23) is made of stainless steel or polytetrafluoroethylene.

9. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The air intake pipe (17) and the U-shaped pipe (23) are sealed by welding or flange connection.

10. The vibration damping device for the feed pipe of a vertical filter press according to claim 1, characterized in that, The volume of the lower section of the U-shaped tube (23) is 50-100 mL.

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