Anti-suck-back device for vacuum pump of rectification equipment

Abstract

The utility model discloses an anti-suck-back device for a vacuum pump of rectification equipment, which comprises a check valve and a buffer component which are respectively arranged on a gas inlet pipeline and a gas outlet pipeline, the gas inlet pipeline is connected with a rectification module, and the buffer component is connected with a waste gas treatment system. The buffer assembly comprises a buffer tank and a flow guide part detachably arranged in the buffer tank, a supporting part is arranged in the buffer tank, the flow guide part is connected with the supporting part in a clamped mode, the buffer tank is divided into a plurality of airflow channels through the flow guide part, a sewage draining opening is formed in the bottom of the buffer tank, and a sewage draining valve is arranged at the sewage draining opening. The check valve is arranged on the air inlet pipeline, so that an oil path can be prevented from being sucked back into the air inlet pipeline after the vacuum pump is closed, and the cleanness of a rectification system pipeline is ensured. The buffering assembly is arranged on the gas outlet pipeline of the vacuum pump, condensed materials are guided out regularly, condensed tail gas can be prevented from entering the oil tank of the vacuum pump, and pollution to the vacuum pump is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of back-inhalation prevention devices, and more specifically to a back-inhalation prevention device for a vacuum pump of a distillation device. Background Art

[0002] 1,5-Dimethyl-2-pyrrolidone (BDMP) is an important chemical raw material, a polar solvent with strong selectivity and good stability, with the advantages of low toxicity, high boiling point, strong solvency, non-flammability, biodegradability, recyclability, safe use and suitable for a variety of formulations. It is a polar aprotic solvent with outstanding solvency, strong selectivity and good stability. It is mainly used in many industries such as petrochemicals, plastics industry, pharmaceuticals, pesticides, dyes and lithium-ion battery manufacturing. It is widely used in aromatic extraction, purification of acetylene, olefins and dienes, as well as solvents for polymers and media for polymerization reactions, such as engineering plastics such as polyamide, polyimide, polyphenylene sulfide and aramid fibers. It is also used in insulating materials, pesticides, pigments, electronic product production and cleaning agents.

[0003] BDMP is produced in a reactor, and the mixture obtained in the reactor needs to be separated and purified to obtain pure substances. First, water in the mixture is extracted with chloroform, and then the pure substances are obtained by distillation and cooling. The industry generally uses vacuum distillation to improve production efficiency. The vacuum equipment uses a rotary vane vacuum pump, and the extracted tail gas is connected to the waste gas treatment system for purification.

[0004] After several production runs, it was found that the exhaust gas would condense into liquid in the vacuum pump and exhaust gas treatment system pipelines and then flow back to the vacuum pump oil tank. Through the oil tank sight glass, it was found that the vacuum pump oil bubbles were turbid after a few days of continuous production and needed to be replaced. On the other hand, after the vacuum pump was turned off at the end of production, if the pressure relief was slow or forgotten, the entire distillation system was in a negative pressure state, and the vacuum pump oil would be sucked back into the distillation pipeline through the vacuum pipeline, causing pure matter pollution. During production, about 10% of the daily output (12 hours) of pure matter was needed to flush the system pipeline, causing great waste and affecting the quality of the finished product. Utility Model Content

[0005] The utility model aims to provide a distillation equipment vacuum pump anti-backflow device to solve the technical problems existing in the above-mentioned background technology.

[0006] The utility model provides a vacuum pump back-inhalation prevention device for distillation equipment, comprising a check valve and a buffer assembly respectively arranged on an inlet pipe and an outlet pipe, wherein the inlet pipe is connected to a distillation module, and the buffer assembly is connected to an exhaust gas treatment system;

[0007] The buffer assembly includes a buffer tank and a flow guide member detachably arranged in the buffer tank, a support member is arranged in the buffer tank, the flow guide member is clamped with the support member, the flow guide member divides the buffer tank into a plurality of air flow channels, a sewage outlet is arranged at the bottom of the buffer tank, and the sewage outlet is provided with a sewage valve.

[0008] In a preferred embodiment, the guide member includes a symmetrically arranged guide module group 1 and a guide module group 2, the guide module group 1 and the guide module group 2 are connected via a connecting plate, and the guide module group 1 and the guide module group 2 are both inclined.

[0009] In a preferred embodiment, the flow guide module 1 and the flow guide module 2 are arranged at an interval, and an air intake channel is formed therebetween.

[0010] In a preferred embodiment, the guide module 1 and the guide module 2 each include a plurality of guide plates arranged in parallel, and air flow channels are formed between adjacent guide plates.

[0011] In a preferred embodiment, the support member includes a support plate and a clamping plate arranged on the support plate, the clamping plate is provided with a clamping slot, and the connecting plate is clamped in the clamping slot.

[0012] In a preferred embodiment, the check valve is a lift check valve and is arranged close to the vacuum pump.

[0013] In a preferred embodiment, the distillation module includes a distillation kettle, a collecting tank connected to the distillation kettle via a pipeline, and a condensation structure arranged on the pipeline.

[0014] The beneficial effects of the technical solution of the utility model are:

[0015] This device can prevent the oil from being sucked back into the intake pipe after the vacuum pump is turned off by setting a check valve on the intake pipe, thus ensuring the cleanliness of the distillation system pipe. By setting a buffer component on the outlet pipe of the vacuum pump and regularly draining the condensed material, the condensed tail gas can be prevented from entering the vacuum pump oil tank and contaminating the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the overall structure of the utility model from another perspective.

[0018] Figure 3 This is a disassembly diagram of the buffer component structure of the utility model.

[0019] Figure 4 This is a schematic diagram of the overall structure of the flow guide member of the utility model.

[0020] Figure 5 This is a top view of the flow guide of the utility model.

[0021] Explanation of the reference numerals: 1 distillation kettle, 2 collecting tank, 3 condensation structure, 4 air inlet pipe, 5 air outlet pipe, 6 check valve, 7 buffer tank, 8 guide member, 9 guide module one, 10 guide module two, 11 guide plate, 12 connecting plate, 13 air inlet channel, 14 air flow channel, 15 support member, 16 support plate, 17 clamping plate, 18 clamping groove, 19 drain outlet, 20 drain valve, 21 vacuum pump. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the sake of illustration and convenience of description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0023] like Figure 1-5 As shown, the technical solution of the utility model provides a vacuum pump back-inhalation prevention device for a distillation equipment, including a check valve 6 and a buffer assembly respectively arranged on an air inlet pipe 4 and an air outlet pipe 5, the air inlet pipe 4 is connected to a distillation module, and the buffer assembly is connected to an exhaust gas treatment system. The distillation module includes a distillation kettle 1 and a collection tank 2 connected to the distillation kettle 1 through a pipeline, and a condensation structure 3 arranged on the pipeline. During operation, the distillation system is in a negative pressure state under the action of a vacuum pump 21, and the vacuum pump 21 continuously extracts gas to the exhaust gas treatment end, and the liquid after distillation is collected by the collection tank 2.

[0024] The check valve 6 is a lifting check valve and is arranged near the vacuum pump 21. By arranging the check valve 6 in the air inlet pipe 4, the device can prevent the oil circuit from being sucked back into the air inlet pipe 4 after the vacuum pump 21 is turned off, thereby ensuring the cleanliness of the distillation system pipe. By arranging a buffer component on the air outlet pipe 5 of the vacuum pump 21 and regularly draining the condensed material, the condensed tail gas can be prevented from entering the oil tank of the vacuum pump 21, thereby avoiding contamination of the vacuum pump 21.

[0025] The buffer assembly includes a buffer tank 7 and a guide member 8 detachably arranged in the buffer tank 7, a support member 15 is arranged in the buffer tank 7, the guide member 8 is snap-connected with the support member 15, the guide member 8 divides the buffer tank 7 into a plurality of air flow channels 14, a sewage outlet 19 is arranged at the bottom of the buffer tank 7, and a sewage valve 20 is arranged at the sewage outlet 19.

[0026] After being extracted by the vacuum pump 21, the gas enters the buffer tank 7 through the outlet pipe 5 and then enters the exhaust gas treatment system. However, the exhaust gas will condense into liquid in the vacuum pump 21 and the exhaust gas treatment system pipeline and then flow back to the oil tank of the vacuum pump 21. Through the setting of the buffer tank 7, the gas is buffered, and the condensed reflux liquid is effectively collected and regularly discharged through the drain port 19 to prevent the condensed liquid from entering the oil tank of the vacuum pump 21.

[0027] The guide member 8 in the buffer tank 7 can guide the gas to ensure that the gas enters the exhaust gas treatment system at a uniform flow rate. At the same time, when the gas hits the guide plate 11, it has a certain demisting effect, further preventing liquid from entering the vacuum pump 21.

[0028] The guide member 8 includes a guide module 1 9 and a guide module 2 10 which are symmetrically arranged. The guide module 1 9 and the guide module 2 10 are connected by a connecting plate 12. The guide module 1 9 and the guide module 2 10 are both inclined. The guide module 1 9 and the guide module 2 10 are arranged at intervals, and an air intake channel 13 is formed between the two. The guide module 1 9 and the guide module 2 10 each include a plurality of guide plates 11 arranged in parallel, and an air flow channel 14 is formed between adjacent guide plates 11.

[0029] In the above scheme, the gas entering the buffer tank 7 will be dispersed into the air flow channel 14 through the air inlet channel 13 to achieve gas dispersion. The inclined guide plate 11 has a guiding effect and also has a certain demisting effect, further preventing the condensed waste liquid from flowing back to the vacuum pump 21.

[0030] The support member 15 includes a support plate 16 and a clamping plate 17 disposed on the support plate 16, and a clamping groove 18 is disposed on the clamping plate 17, and the connecting plate 12 is clamped in the clamping groove 18. The guide member 8 is placed in the buffer tank 7 as a whole, and is fixed and positioned by the clamping groove 18 on the clamping plate 17, and can be taken out of the buffer tank 7 for cleaning regularly.

[0031] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A distillation equipment vacuum pump anti-backflow device, characterized in that: It includes a check valve and a buffer assembly respectively arranged on the air inlet pipe and the air outlet pipe, the air inlet pipe is connected to the distillation module, and the buffer assembly is connected to the exhaust gas treatment system; The buffer assembly includes a buffer tank and a flow guide member detachably arranged in the buffer tank, a support member is arranged in the buffer tank, the flow guide member is clamped with the support member, the flow guide member divides the buffer tank into a plurality of air flow channels, a sewage outlet is arranged at the bottom of the buffer tank, and the sewage outlet is provided with a sewage valve.

2. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 1, characterized in that: The flow guide member comprises a symmetrically arranged flow guide module group 1 and a symmetrically arranged flow guide module group 2. The flow guide module group 1 and the flow guide module group 2 are connected via a connecting plate. The flow guide module group 1 and the flow guide module group 2 are both inclinedly arranged.

3. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 2, characterized in that: The first flow guiding module and the second flow guiding module are arranged at an interval, and an air intake channel is formed between the two.

4. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 2, characterized in that: The guide module 1 and the guide module 2 both include a plurality of guide plates arranged in parallel, and air flow channels are formed between adjacent guide plates.

5. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 2, characterized in that: The support member comprises a support plate and a clamping plate arranged on the support plate, the clamping plate is provided with a clamping slot, and the connecting plate is clamped in the clamping slot.

6. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 1, characterized in that: The check valve is a lifting check valve and is arranged close to the vacuum pump.

7. The anti-backflow device for a vacuum pump of a distillation equipment according to claim 1, characterized in that: The distillation module comprises a distillation kettle, a collecting tank connected to the distillation kettle through a pipeline, and a condensation structure arranged on the pipeline.

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