Negative pressure defoaming device capable of recycling PVC paste resin latex liquid

Abstract

The utility model discloses a negative pressure defoaming device capable of recycling PVC (polyvinyl chloride) paste resin latex liquid, which comprises a storage tank and a negative pressure defoaming device, a feeding pipeline is arranged at the top of the storage tank close to the tank wall, a stirring device is arranged in the center of the top of the storage tank, and a discharging pipeline is arranged at the bottom of the storage tank close to the tank wall; and the negative pressure defoaming device comprises a first fan, a first cyclone separator, a second cyclone separator and a second fan. Negative pressure is formed in the storage tank through the first fan and the second fan, and foam breaking and gas-liquid separation are achieved through the first cyclone separator and the second cyclone separator, so that defoaming is achieved; the backflow pipeline at the bottom of the volute of the first fan can effectively solve the problem of liquid accumulation of the fan, the vacuum degree in the material storage tank is ensured, and the operation stability and the defoaming effect of the device are improved; the device is simple in structure and stable in operation, has the functions of defoaming and liquid recovery, and is relatively high in applicability.

Description

Technical fields:

[0001] This utility model relates to the field of PVC paste resin production technology, and in particular to a negative pressure defoaming device for recyclable PVC paste resin latex liquid. Background technology:

[0002] Polyvinyl chloride (PVC) paste resin is a white powder material in its unprocessed state. It is mixed with plasticizers and other auxiliary materials to form a liquid plastic paste, which is mainly used in many fields such as artificial leather, floor covering, dipped gloves, window screens, paddy field boots, tool handles, wallpaper, floor rolls, battery separators, toys, metal coatings, hoses, and automotive interior materials.

[0003] After PVC polymerization is completed, the recyclable PVC paste resin latex liquid in the polymerization reactor is pumped to the storage tank. The latex formed after polymerization is prone to foaming. If the foam is not eliminated in time, it is easy to overflow from the storage tank, which will affect the site environment and cause problems such as material waste, unstable equipment operation, and safety hazards.

[0004] Currently, defoamers are usually added to the polymerization reactor. The main function of defoamers is to eliminate air bubbles in the liquid, which can reduce the generation of some foam, but cannot completely eliminate the foam formed. Utility model content:

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a negative pressure defoaming device for recyclable PVC paste resin latex liquid.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a negative pressure defoaming device for recyclable PVC paste resin latex liquid, including a storage tank and a negative pressure defoaming device; the storage tank is provided with an inlet pipe near the tank wall at the top, a stirring device is provided at the center of the top of the storage tank, and an outlet pipe is provided near the tank wall at the bottom of the storage tank; the negative pressure defoaming device includes a first fan, a first cyclone separator, a second cyclone separator, and a second fan, the inlet of the first fan is connected to the top of the storage tank, the outlet of the first fan is connected to the inlet of the first cyclone separator, the outlet of the first cyclone separator is connected to the inlet of the second cyclone separator, the return pipe of the first cyclone separator is connected to the top of the storage tank, the outlet of the second cyclone separator is connected to the inlet of the second fan, and the return pipe of the second cyclone separator is connected to the top of the storage tank.

[0007] Furthermore, the bottom of the storage tank is inclined downwards towards the side where the discharge pipe is located.

[0008] Furthermore, the top of the storage tank is also connected to a cleaning agent pipeline and a clean water pipeline.

[0009] Furthermore, the first blower is positioned at a height higher than the top of the storage tank, and the bottom of the volute of the first blower is provided with a first blower return pipe connected to the top of the storage tank. The inlet of the first blower is also connected to a clean water pipe.

[0010] The beneficial effects of this utility model are as follows: the first and second blowers create a negative pressure inside the storage tank, causing some foam to burst due to the pressure change and some foam to be sucked out. The first and second cyclone separators break up the foam and separate the gas and liquid, thus achieving defoaming. The return pipe at the bottom of the first blower casing can effectively solve the problem of liquid accumulation in the blower, ensuring the vacuum degree inside the storage tank and improving the operational stability and defoaming effect of the device. This device has a simple structure, stable operation, and functions of defoaming and liquid recovery, making it highly applicable. Attached image description:

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Storage tank; 2. Negative pressure defoaming device; 3. Feeding pipe; 4. Stirring device; 5. Stirring rod; 6. Stirring paddle; 7. Cleaning agent pipe; 8. Clean water pipe; 9. Discharge pipe; 10. First blower; 11. First cyclone separator; 12. Second cyclone separator; 13. Second blower; 14. First cyclone separator return pipe; 15. Second cyclone separator return pipe; 16. First blower return pipe. Detailed implementation method:

[0014] 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.

[0015] Combination Figure 1As shown, this utility model is a negative pressure defoaming device for recyclable PVC paste resin latex liquid, including a storage tank 1 and a negative pressure defoaming device 2. The storage tank 1 has an inlet pipe 3 near the tank wall at the top. A stirring device 4 is located at the center of the top of the storage tank 1. The motor of the stirring device 4 is installed at the top of the storage tank 1. The stirring rod 5 of the stirring device 4 extends into the tank body. A stirring paddle 6 is fixedly connected to the lower part of the stirring rod 5. The top of the storage tank 1 is also connected to a cleaning agent pipe 7 and a clean water pipe 8. The bottom of the storage tank 1 has an outlet pipe 9 near the tank wall. The bottom of the storage tank 1 is inclined downwards towards the side with the outlet pipe 9 to ensure that all materials can be discharged during discharge.

[0016] The negative pressure defoaming device 2 includes a first blower 10, a first cyclone separator 11, a second cyclone separator 12, and a second blower 13. The inlet of the first blower 10 is connected to the top of the storage tank 1, and the horizontal height of the first blower 10 is higher than the top of the storage tank 1. The inlet of the first blower 10 is also connected to a clean water pipe 8 to clean the inside of the first blower 10. The bottom of the volute of the first blower 10 is provided with a first blower return pipe 16 connected to the top of the storage tank 1. The clean water pipe 8 intermittently flows flushing water to flush the blades of the first blower 10, preventing the accumulation of foam from affecting the air extraction capacity. The liquid accumulated in the volute can flow into the storage tank 1 through the first blower return pipe 16, ensuring the stable operation of the first blower 10; the outlet of the first blower 10 is connected to the inlet of the first cyclone separator 11, the outlet of the first cyclone separator 11 is connected to the inlet of the second cyclone separator 12, the bottom of the first cyclone separator 11 is connected to one end of the first cyclone separator return pipe 14, the bottom end of the first cyclone separator return pipe 14 is connected to the top of the storage tank 1, the outlet of the second cyclone separator 12 is connected to the inlet of the second blower 13, and the second cyclone separator return pipe 15 is connected to the top of the storage tank 1.

[0017] Working principle:

[0018] During operation, storage tank 1 is in a sealed state. Material from upstream is fed into storage tank 1 via feed pipe 3. The stirring device 4 inside storage tank 1 is activated to promote the removal of air bubbles in the liquid. After feeding begins, the first blower 10, the first cyclone separator 11, the second cyclone separator 12, and the second blower 13 are started sequentially, creating negative pressure inside storage tank 1. This negative pressure causes some of the foam above the liquid surface to break, while some enters the first blower 10 through the pipe. Inside the first blower 10, some of the broken foam falls into the bottom volute, forming liquid, which is then returned to storage tank 1 via the first blower return pipe 16. A portion of the liquid enters the first cyclone separator 11 from the outlet of the first blower 10, where it undergoes gas-liquid separation. The liquid is returned to the storage tank 1 via the return pipe 14 of the first cyclone separator, while the gas carrying some liquid enters the second cyclone separator 12 for further gas-liquid separation. The liquid is returned to the storage tank 1 via the return pipe 15 of the second cyclone separator, and the gas is extracted by the second blower 13. At the same time, the second blower 13 ensures that the negative pressure defoaming device 2 operates under a certain negative pressure. During operation, a small amount of clean water can be introduced into the first blower 10 via the clean water pipe 8 for rinsing to prevent material from adhering to the inner wall and blades of the first blower 10, thus affecting the defoaming effect. After defoaming, the material is discharged through the discharge pipe 9. After discharge, the storage tank 1 is cleaned through the cleaning agent pipe 7 and the clean water pipe 8.

[0019] The above description is only a preferred embodiment of the present utility model and is used only to facilitate the explanation of the present utility model. It is not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. A negative pressure defoaming device for recyclable PVC paste resin latex liquid, comprising a storage tank, characterized in that, It also comprises a negative pressure defoaming device; a feeding pipeline is arranged on the top of the storage tank near the tank wall, a stirring device is arranged at the center of the top of the storage tank, and a discharging pipeline is arranged on the bottom of the storage tank near the tank wall; The negative pressure defoaming device comprises a first fan, a first cyclone separator, a second cyclone separator and a second fan; the inlet of the first fan is connected with the top of the storage tank; the outlet of the first fan is connected with the inlet of the first cyclone separator; the outlet of the first cyclone separator is connected with the inlet of the second cyclone separator; the first cyclone separator backflow pipeline is connected with the top of the storage tank; the outlet of the second cyclone separator is connected with the inlet of the second fan; and the second cyclone separator backflow pipeline is connected with the top of the storage tank.

2. The negative pressure defoaming device for recyclable PVC paste resin latex liquid according to claim 1, characterized in that, The bottom of the storage tank is inclined downward to the side where the discharging pipeline is arranged.

3. The negative pressure defoaming device for recyclable PVC paste resin latex liquid according to claim 1 or 2, characterized in that, The top of the storage tank is also connected with a cleaning agent pipeline and a clean water pipeline.

4. The negative pressure defoaming device for recyclable PVC paste resin latex liquid according to claim 3, characterized in that, The horizontal height of the first fan is higher than the top of the storage tank; the volute bottom of the first fan is provided with a first fan backflow pipeline connected with the top of the storage tank; and the inlet of the first fan is also connected with the clean water pipeline.

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