NMP gas recovery equipment

Abstract

NMP gas recovery equipment comprises a gas inlet pipe, a front filter box, a gas conveying pipe, a rear filter box, an exhaust pipe, a suction device and a water path system, the gas inlet pipe, the front filter box, the gas conveying pipe, the rear filter box and the exhaust pipe are sequentially communicated to form an NMP gas recovery channel, and the suction device is arranged in the NMP gas recovery channel; the waterway system comprises a water supplementing channel, a rear circulation channel, a water conveying channel, a front circulation channel and a drainage channel, the two ends of the rear circulation channel are communicated with the rear filter box, the two ends of the front circulation channel are communicated with the front filter box, the two ends of the water supplementing channel are connected into the rear circulation channel and the front circulation channel respectively, and the drainage channel is communicated with the front circulation channel. According to the NMP gas recovery equipment, water replenishing, water circulation and water drainage operations of the two filter boxes can be realized only by adopting one water path system, so that the equipment structure can be simplified, the equipment volume can be reduced, and the requirements of miniaturization and light weight can be met.

Description

Technical Field

[0001] The utility model relates to a recycling device, in particular to an NMP gas recycling device. Background Art

[0002] When a coater works, NMP (N-methylpyrrolidone) gas will be generated. Since NMP gas is corrosive, it is necessary to recycle and purify the NMP gas to avoid harm to the human body. At present, most manufacturers will use NMP gas recycling devices to recycle and purify NMP gas.

[0003] Some NMP gas recycling devices use the condensation method for recycling and purification. The main principle is to liquefy the NMP gas by cooling and then recover the liquid. However, the condensation structure requires complex components, making the NMP gas recycling device very bulky and complex in structure, and not applicable to places with small space.

[0004] There are also some NMP gas recycling devices that use the spraying method to recycle and purify NMP gas. For example, a fully recycled NMP waste gas recycling device disclosed in Chinese Utility Model CN206604361U, its spraying tower assembly includes 2 to 4 serially arranged spraying tower units, which use water to dissolve NMP gas and discharge clean air. However, each spraying tower unit of the above-mentioned recycling device needs to be provided with a water replenishing pipeline and a drainage pipeline, which complicates the layout of the water circuit and is not conducive to the miniaturization and light weight of the overall recycling device. Summary of the Utility Model

[0005] In order to overcome the disadvantages and deficiencies in the prior art, the purpose of the utility model is to design a spray-type NMP gas recycling device, which uses a water circuit system to simultaneously control the water replenishment, water circulation and drainage operations of two filter boxes, simplifies the device structure and reduces the device volume.

[0006] To achieve the above purpose, the utility model provides an NMP gas recycling device, including: an air inlet pipe, a front filter box, an air delivery pipe, a rear filter box, an exhaust pipe, a suction device and a water circuit system. The air inlet pipe, the front filter box, the air delivery pipe, the rear filter box and the exhaust pipe are sequentially connected to form an NMP gas recycling channel. The suction device is arranged in the NMP gas recycling channel. The water circuit system includes: a water replenishment channel, a rear circulation channel, a water delivery channel, a front circulation channel and a drainage channel. The water replenishment channel is communicated with the rear circulation channel. Both ends of the rear circulation channel are communicated with the rear filter box. Both ends of the front circulation channel are communicated with the front filter box. Both ends of the water delivery channel are respectively communicated with the rear circulation channel and the front circulation channel. The drainage channel is communicated with the front circulation channel.

[0007] Further, the water replenishing channel includes a water replenishing pipe and a liquid replenishing three-way pipe, and the water replenishing pipe is communicated with the liquid replenishing three-way pipe. Among them, when performing water circulation on the rear filter box, the liquid replenishing three-way pipe opens the rear circulation channel and closes the water replenishing channel; when replenishing water to the rear filter box, the liquid replenishing three-way pipe opens the water replenishing channel and closes the rear circulation channel.

[0008] Further, the rear circulation channel includes a rear water pipe, a rear three-way pipe, a rear circulation pump, and a rear spray pipe, and the rear water pipe, the rear three-way pipe, the liquid replenishing three-way pipe, the rear circulation pump, the rear spray pipe, and the rear filter box form a closed-loop connection. Among them, the rear circulation pump is used to drive the water circulation operation of the rear circulation channel.

[0009] Further, the water transmission channel includes a water transmission pipe, and the water transmission pipe is communicated with the rear three-way pipe. Among them, the water transmission pipe is used to connect the rear circulation channel and the front circulation channel.

[0010] Further, the front circulation channel includes a front water pipe, a front three-way pipe, a front circulation pump, and a front spray pipe. The water transmission pipe is communicated with the front three-way pipe, and the front water pipe, the front three-way pipe, the front circulation pump, the front spray pipe, and the front filter box form a closed-loop connection. Among them, the front circulation pump is used to drive the water circulation operation of the front circulation channel; when performing water circulation on the front filter box, the front three-way pipe opens the front circulation channel and closes the water transmission channel; when replenishing water to the front filter box, the front three-way pipe opens the water transmission channel and closes the front circulation channel.

[0011] Further, the drainage channel includes a drainage pipe and a drainage three-way pipe. The front circulation pump and the front spray pipe are connected through the drainage three-way pipe, and the drainage pipe is communicated with the drainage three-way pipe. Among them, when performing water circulation on the front filter box, the drainage three-way pipe closes the drainage channel and opens the front circulation channel; when draining water, the drainage three-way pipe closes the front circulation channel and opens the drainage channel.

[0012] Further, the front filter box includes a front box body and a front liquid level gauge. The front water pipe and the front spray pipe are both communicated with the front box body, and the front liquid level gauge is arranged on the front box body; the rear filter box includes a rear box body and a rear liquid level gauge. The rear water pipe and the rear spray pipe are both communicated with the rear box body, and the rear liquid level gauge is arranged on the rear box body. Among them, setting the front liquid level gauge and the rear liquid level gauge can monitor the water level in real time and realize the operation of automatic water replenishment.

[0013] Further, the front filter box further includes a front filter element, and the front filter element is located inside the front box body, and the front filter element is located between the outlet of the intake pipe and the inlet of the gas transmission pipe; the rear filter box further includes a rear filter element, and the rear filter element is located inside the rear box body, and the rear filter element is located between the outlet of the gas transmission pipe and the inlet of the exhaust pipe. Among them, setting the front filter element and the rear filter element can filter impurities in the NMP gas and make the gas cleaner.

[0014] Further, the front filter box further includes: front liquid cooling pipes, which are all located inside the front box body, and the front liquid cooling pipes are located below the front filter element; the rear filter box further includes: rear liquid cooling pipes, which are located inside the rear box body, and the rear liquid cooling pipes are located below the rear filter element. Among them, the front liquid cooling pipes and the rear liquid cooling pipes are provided to cool the interiors of the front box body and the rear box body respectively, so as to avoid the discharged gas having too high a temperature, thereby protecting the operators.

[0015] Further, the suction device is arranged on the exhaust pipe. Among them, the gas in the exhaust pipe is the gas that has been purified, with weak corrosiveness and not easily causing damage to the suction device.

[0016] After adopting the above technical solution, the beneficial effects of the present utility model are as follows: Since the NMP gas recovery equipment of the present utility model can realize the water replenishment, water circulation and drainage operations of the two filter boxes only by using one water circuit system, the equipment structure can be simplified, the equipment volume can be reduced, and the requirements of miniaturization and light weight can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the NMP gas recovery equipment related to the present utility model;

[0018] Figure 2 It is a schematic diagram of the water circuit system related to the present utility model;

[0019] Figure 3 It is a vertical sectional view of the NMP gas recovery equipment related to the present utility model.

[0020] The reference numerals are: 1, intake pipe; 2, front filter box; 21, front box body; 22, front liquid level gauge; 23, front filter element; 24, front liquid cooling pipe; 3, gas transmission pipe; 4, rear filter box; 42, rear liquid level gauge; 43, rear filter element; 44, rear liquid cooling pipe; 5, exhaust pipe; 6, fan; 7, water circuit system; 71, water replenishing pipe; 72, rear water pipe; 73, rear spray pipe; 74, water transmission pipe; 75, front water pipe; 76, front spray pipe; 77, drain pipe; 81, rear circulation pump; 82, front circulation pump; 91, liquid replenishing three-way pipe; 92, rear three-way pipe; 93, front three-way pipe; 94, drain three-way pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solution of the present utility model will be further described below through embodiments:

[0022] The present utility model provides an NMP gas recovery equipment, as Figure 1As shown in the figure, it includes: an intake pipe 1, a front filter box 2, a gas transmission pipe 3, a rear filter box 4, an exhaust pipe 5, a fan 6, and a water circuit system 7. The intake pipe 1, the front filter box 2, the gas transmission pipe 3, the rear filter box 4, and the exhaust pipe 5 are connected in sequence to form an NMP gas recovery channel. The fan 6 is arranged in the NMP gas recovery channel to drive the flow of NMP gas. The water circuit system 7 is connected to both the front filter box 2 and the rear filter box 4 simultaneously to achieve water replenishment, water circulation, and drainage operations for the front filter box 2 and the rear filter box 4.

[0023] When the NMP gas recovery equipment is working, first, the water circuit system 7 replenishes water to the front filter box 2 and the rear filter box 4 until the water level meets the requirements. Then, the fan 6 is started. The NMP gas generated by the coater enters the front filter box 2 from the intake pipe 1. The water in the front filter box 2 is controlled by the water circuit system 7 to perform circulating spraying to dissolve a part of the NMP gas, achieving the first-stage filtration. The remaining NMP gas enters the rear filter box 4 through the gas transmission pipe 3. The water in the rear filter box 4 is controlled by the water circuit system 7 to perform circulating spraying to dissolve the remaining NMP gas, achieving the second-stage filtration. Finally, the clean gas is discharged from the exhaust pipe 5. During the above working process, since dissolving NMP gas will cause water consumption, if the water level in the front filter box 2 or the rear filter box 4 is insufficient, the operation is stopped, and the water circuit system 7 is used to replenish water until the water level meets the requirements.

[0024] When it is necessary to clean the NMP gas recovery equipment, first, the water in the front filter box 2 and the rear filter box 4 is drained using the water circuit system 7, and then the front filter box 2 and the rear filter box 4 are opened for cleaning.

[0025] In this embodiment, the fan 6 is used as the gas suction device. In other embodiments, other devices can also be used, such as an air pump.

[0026] In this embodiment, the fan 6 is arranged on the exhaust pipe 5. In other embodiments, the fan 6 can also be arranged at other positions in the NMP gas recovery channel, such as the intake pipe 1.

[0027] Specifically, the waterway system 7 includes a water replenishing channel, a rear circulation channel, a water conveyance channel, a front circulation channel, and a drainage channel. The water replenishing channel is connected to the rear circulation channel. Both ends of the rear circulation channel are connected to the rear filter tank 4. Both ends of the front circulation channel are connected to the front filter tank 2. Both ends of the water conveyance channel are respectively connected to the rear circulation channel and the front circulation channel. The drainage channel is connected to the front circulation channel. When the NMP gas recovery device is operating, the rear circulation channel and the front circulation channel are respectively used to implement the water circulation spraying operation of the rear filter tank 4 and the front filter tank 2. When the rear filter tank 4 needs to be replenished with water, the NMP gas recovery device stops the water circulation, and the water replenishing channel replenishes water to the rear filter tank 4 through the rear circulation channel. When the front filter tank 2 needs to be replenished with water, the NMP gas recovery device stops the water circulation, and the water in the rear filter tank 4 is replenished into the front filter tank 2 through the water conveyance channel and the front circulation channel. If the water level in the rear filter tank 4 is insufficient, the rear filter tank 4 is further replenished with water through the water replenishing channel and the rear circulation channel. When cleaning is required, the drainage channel extracts the water in the front filter tank 2 through the front circulation channel, and extracts the water in the rear filter tank 4 through the water conveyance channel and the front circulation channel.

[0028] More specifically, as Figure 2As shown in the figure, the water replenishing channel includes a water replenishing pipe 71 and a liquid replenishing three-way pipe 91, and the water replenishing pipe 71 is connected to the liquid replenishing three-way pipe 91; the post-circulation channel includes a post-water pipe 72, a post-three-way pipe 92, a post-circulation pump 81 and a post-spray pipe 73, and the post-water pipe 72, the post-three-way pipe 92, the liquid replenishing three-way pipe 91, the post-circulation pump 81, the post-spray pipe 73 and the post-filter box 4 form a closed-loop connection; the water transmission channel includes a water transmission pipe 74, and the water transmission pipe 74 is connected to the post-three-way pipe 92; the pre-circulation channel includes a pre-water pipe 75, a pre-three-way pipe 93, a pre-circulation pump 82 and a pre-spray pipe 76, the water transmission pipe 74 is connected to the pre-three-way pipe 93, and the pre-water pipe 75, the pre-three-way pipe 93, the pre-circulation pump 82, the pre-spray pipe 76 and the pre-filter box 2 form a closed-loop connection; the drainage channel includes a drainage pipe 77 and a drainage three-way pipe 94, and the pre-circulation pump 82 and the pre-spray pipe 76 are connected through the drainage three-way pipe 94, and the drainage pipe 77 is connected to the drainage three-way pipe 94. When the NMP gas recovery device is working, the post-circulation pump 81 and the pre-circulation pump 82 are started, and the water in the post-filter box 4 sequentially passes through the post-water pipe 72, the post-three-way pipe 92, the liquid replenishing three-way pipe 91, the post-circulation pump 81 and the post-spray pipe 73 and finally returns to the post-filter box 4, and circulates in this way; the water in the pre-filter box 2 sequentially passes through the pre-water pipe 75, the pre-three-way pipe 93, the pre-circulation pump 82, the drainage three-way pipe 94 and the pre-spray pipe 76 and finally returns to the pre-filter box 2, and circulates in this way. If the water level in the post-filter box 4 is insufficient during the working process, the post-circulation pump 81 and the pre-circulation pump 82 stop, the liquid replenishing three-way pipe 91 opens the water replenishing channel and closes the post-circulation channel, and the water enters the post-filter box 4 sequentially through the water replenishing pipe 71, the liquid replenishing three-way pipe 91, the post-three-way pipe 92 and the post-water pipe 72 under the action of the external water pressure; if the water level in the pre-filter box 2 is insufficient during the working process, the post-circulation pump 81 and the pre-circulation pump 82 stop, the pre-three-way pipe 93 opens the water transmission channel and closes the pre-circulation channel, and the water in the post-filter box 4 sequentially passes through the post-water pipe 72, the post-three-way pipe 92, the water transmission pipe 74, the pre-three-way pipe 93 and the pre-water pipe 75 and enters the pre-filter box 2. When cleaning is required after the work is completed, the post-circulation pump 81 stops working, the pre-circulation pump 82 is started, the drainage three-way pipe 94 opens the drainage channel and closes the pre-circulation channel, and the water in the pre-filter box 2 sequentially passes through the pre-water pipe 75, the pre-three-way pipe 93, the pre-circulation pump 82, the drainage three-way pipe 94 and the drainage pipe 77 and is finally discharged; the water in the post-filter box 4 first enters the pre-filter box 2 and then is discharged from the pre-filter box 2. Among them, the water replenishing pipe 71 is connected to an external water supply pipe, and the drainage pipe 77 is connected to an external wastewater treatment device.

[0029] More specifically, the liquid replenishing three-way pipe 91, the pre-three-way pipe 93 and the drainage three-way pipe 94 are all provided with electric ball valves for controlling the water flow direction of the three-way pipe.

[0030] As a preferred solution, the nozzles of the rear spray pipe 73 and the front spray pipe 76 are rotary nozzles. During the spraying process, the nozzles of the rear spray pipe 73 and the front spray pipe 76 rotate simultaneously, thereby increasing the coverage area of the sprayed water and improving the dissolution efficiency.

[0031] Specifically, as shown in Figure 1 and 3 , the front filter box 2 includes: a front box body 21, a front liquid level gauge 22, a front filter element 23, and a front liquid cooling pipe 24. The front water pipe 75 and the front spray pipe 76 are both communicated with the front box body 21. The front liquid level gauge 22 is arranged on the front box body 21. The front filter element 23 and the front liquid cooling pipe 24 are both located inside the front box body 21. The front filter element 23 is located between the outlet of the intake pipe 1 and the inlet of the air delivery pipe 3. The front liquid cooling pipe 24 is located below the front filter element 23. The rear filter box 4 includes: a rear box body 41, a rear liquid level gauge 42, a rear filter element 43, and a rear liquid cooling pipe 44. The rear water pipe 72 and the rear spray pipe 73 are both communicated with the rear box body 41. The rear liquid level gauge 42 is arranged on the rear box body 41. The rear filter element 43 and the rear liquid cooling pipe 44 are both located inside the rear box body 41. The rear filter element 43 is located between the outlet of the air delivery pipe 3 and the inlet of the exhaust pipe 5. The rear liquid cooling pipe 44 is located below the rear filter element 43. When the NMP gas recovery device is working, the front liquid level gauge 22 and the rear liquid level gauge 42 are respectively used to monitor the water levels in the front box body 21 and the rear box body 41. The front filter element 23 and the rear filter element 43 are both used to filter the NMP gas. The front liquid cooling pipe 24 and the rear liquid cooling pipe 44 are respectively used to cool the water in the front box body 21 and the rear box body 41. Among them, the front liquid cooling pipe 24 and the rear liquid cooling pipe 44 are both communicated with an external liquid cooling device.

Claims

1. An NMP gas recovery device, comprising: An air inlet pipe, a front filter box, an air delivery pipe, a rear filter box, an exhaust pipe, a suction device and a water circuit system. The air inlet pipe, the front filter box, the air delivery pipe, the rear filter box and the exhaust pipe are sequentially connected and communicated to form an NMP gas recovery channel. The suction device is arranged in the NMP gas recovery channel. It is characterized in that: the water circuit system includes: a water replenishing channel, a rear circulation channel, a water delivery channel, a front circulation channel and a drainage channel. The water replenishing channel is communicated with the rear circulation channel. Both ends of the rear circulation channel are communicated with the rear filter box. Both ends of the front circulation channel are communicated with the front filter box. Both ends of the water delivery channel are respectively communicated with the rear circulation channel and the front circulation channel. The drainage channel is communicated with the front circulation channel.

2. The NMP gas recovery device according to claim 1, characterized in that: The water replenishing channel includes: a water replenishing pipe and a liquid replenishing three-way pipe. The water replenishing pipe is communicated with the liquid replenishing three-way pipe.

3. The NMP gas recovery device according to claim 2, wherein: The rear circulation channel includes: a rear water pipe, a rear three-way pipe, a rear circulation pump and a rear spray pipe. The rear water pipe, the rear three-way pipe, the liquid replenishing three-way pipe, the rear circulation pump, the rear spray pipe and the rear filter box form a closed-loop connection.

4. The NMP gas recovery device according to claim 3, wherein: The water delivery channel includes: a water delivery pipe. The water delivery pipe is communicated with the rear three-way pipe.

5. The NMP gas recovery device according to claim 4, characterized in that: The front circulation channel includes: a front water pipe, a front three-way pipe, a front circulation pump and a front spray pipe. The water delivery pipe is communicated with the front three-way pipe. The front water pipe, the front three-way pipe, the front circulation pump, the front spray pipe and the front filter box form a closed-loop connection.

6. The NMP gas recovery device according to claim 5, characterized in that: The drainage channel includes: a drainage pipe and a drainage three-way pipe. The front circulation pump and the front spray pipe are communicated through the drainage three-way pipe. The drainage pipe is communicated with the drainage three-way pipe.

7. The NMP gas recovery device according to claim 6, wherein: The front filter box includes: a front box body and a front liquid level gauge. The front water pipe and the front spray pipe are both communicated with the front box body. The front liquid level gauge is arranged on the front box body. The rear filter box includes: a rear box body and a rear liquid level gauge. The rear water pipe and the rear spray pipe are both communicated with the rear box body. The rear liquid level gauge is arranged on the rear box body.

8. The NMP gas recovery device according to claim 7, wherein: The front filter box further includes: a front filter element. The front filter element is located inside the front box body. The front filter element is located between the outlet of the air inlet pipe and the inlet of the air delivery pipe. The rear filter box further includes: a rear filter element. The rear filter element is located inside the rear box body. The rear filter element is located between the outlet of the air delivery pipe and the inlet of the exhaust pipe.

9. The NMP gas recovery device according to claim 8, characterized in that: The front filter box further includes: a front liquid cooling pipe. The front liquid cooling pipe is located inside the front box body. And the front liquid cooling pipe is located below the front filter element. The rear filter box further includes: a rear liquid cooling pipe. The rear liquid cooling pipe is located inside the rear box body. The rear liquid cooling pipe is located below the rear filter element.

10. The NMP gas recovery device according to claim 1, wherein: The suction device is arranged on the exhaust pipe.

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