Separation and recovery device for organic solvent in tail gas of dry vacuum pump

Abstract

The invention relates to the technical field of tail gas separation, in particular to a dry vacuum pump tail gas organic solvent separation and recovery device which comprises a gas inlet box, a dust removal box, an adsorption box, a box cover and two gas passing cylinders, the gas inlet box and the box cover are of hollow structures, and the section of the adsorption box is in a concave shape with an upward opening; a gas inlet mechanism is arranged at the gas inlet box, the gas inlet mechanism is composed of a gas passing assembly and a control assembly, the gas passing assembly is used for tail gas entering, the control assembly is used for controlling the gas inlet direction, the control assembly comprises a lifting plate, the lifting plate is connected into the gas inlet box in a sealed and sliding mode, and a sliding column is fixedly connected to the upper surface of the lifting plate; and a dust removal mechanism is arranged in the dust removal box and is used for separating and removing dust in the tail gas. The device has the advantages that organic solvents in tail gas can be effectively recycled, secondary pollution caused by combustion is avoided, meanwhile, waste recycling is achieved, and the automation degree is higher.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas separation technology, and in particular to a device for separating and recovering organic solvents from the exhaust gas of a dry vacuum pump. Background Technology

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container and create a vacuum. There are many types of vacuum pumps, among which the dry vacuum pump is one. A dry vacuum pump is a vacuum pumping device that uses a pair of screws rotating synchronously at high speed in opposite directions within the pump casing to generate suction and exhaust. During operation, there is no friction between the screws, resulting in smooth operation, low noise, and no need for lubrication in the working chamber. Therefore, it can pump gases containing large amounts of water vapor and small amounts of dust. However, dry vacuum pumps produce exhaust gas during operation. The main components of this exhaust gas are dimethyl carbonate, ethyl methyl carbonate, ethylene carbonate, methane, ethane, ethylene, and a small amount of vacuum pump oil. This exhaust gas contains a large amount of organic solvents, and direct emission would cause significant environmental pollution. Therefore, the exhaust gas needs to be treated before being released.

[0003] In existing technologies, exhaust gas treatment generally involves filtering first, followed by direct combustion to convert organic solvents into carbon dioxide and water. However, during combustion, some pungent gases are produced, along with new pollutants, leading to secondary pollution. Furthermore, some organic solvents in the exhaust gas cannot be recycled, resulting in waste. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing an organic solvent separation and recovery device for the exhaust gas of a dry vacuum pump.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An organic solvent separation and recovery device for dry vacuum pump exhaust gas includes an air inlet box, a dust removal box, an adsorption box, a box cover, and two air passage cylinders. The air inlet box and the box cover are hollow structures, and the cross-section of the adsorption box is a U-shape with the opening facing upward.

[0007] An air intake mechanism is provided at the air intake box. The air intake mechanism consists of an air passage component and a control component. The air passage component is used for exhaust gas to enter, and the control component is used to control the air intake direction. The control component includes a lifting plate, which is sealed and slidably connected inside the air intake box. A sliding column is fixedly connected to the upper surface of the lifting plate.

[0008] The dust removal box is equipped with a dust removal mechanism, which is used to separate and remove dust from the exhaust gas.

[0009] The adsorption box is provided with an adsorption mechanism for adsorbing and separating organic solvents in the tail gas.

[0010] The box cover is provided with a driving mechanism composed of a separation component and a power component, the separation component is used for separating the adsorption material into multiple groups, and the power component is used for providing operating power.

[0011] The gas passing cylinder is provided with a monitoring mechanism for monitoring the adsorption state of the adsorption material, the monitoring mechanism comprises a fifth pipe, the fifth pipe is fixedly connected with the gas passing cylinder, and a differential pressure sensor is arranged in the fifth pipe.

[0012] Further, the gas passing component comprises a hollow transfer block, the transfer block is fixedly connected with the side wall of the gas inlet box, the gas inlet box is fixedly connected with the dust removal box, the side wall of the transfer block is fixedly connected with the first pipe, and the transfer block and the gas inlet box are fixedly connected with two second pipes.

[0013] Further, the control component further comprises a first switch and a second switch, the first switch and the second switch are fixedly connected with the inner top wall and the inner bottom wall of the gas inlet box, respectively, one of the second pipes and the third pipes is provided with a first electromagnetic valve, the other of the second pipes and the third pipes is provided with a second electromagnetic valve, and the first electromagnetic valve and the second electromagnetic valve are electrically connected with the first switch and the second switch through wires.

[0014] Further, the dust removal mechanism comprises a preparation cavity and a separation cavity, the preparation cavity and the separation cavity are arranged in the dust removal box, the preparation cavity and the separation cavity are communicated, the third pipe extends through the preparation cavity, and the lower surface of the dust removal box is fixedly connected with a storage box.

[0015] Further, the monitoring mechanism further comprises two pistons, the pistons are sealingly and slidingly connected with the fifth pipes, one of the gas passing cylinders is fixedly connected with the dust removal box, a second spring is fixedly connected between the piston and the differential pressure sensor, a sliding groove is arranged in the inner side wall of the gas passing cylinder, a pressure block is sealingly and slidingly connected with the gas passing cylinder through the sliding groove, a first spring is fixedly connected between the pressure block and the inner side wall of the sliding groove, and the sliding groove and the fifth pipe are filled with hydraulic oil.

[0016] Further, the box cover is fixedly connected with the upper surface of the adsorption box through bolts, the main shaft is rotatably connected with the top wall of the box cover through a bearing, one end of the main shaft located in the box cover is fixedly connected with a first gear through a bearing, the bottom wall of the box cover is rotatably connected with an electric clutch through a bearing, the electric clutch is fixedly connected with a rotating plate, the lower surface of the rotating plate is fixedly connected with a partition plate, the rotating plate is rotatably connected with a plurality of auxiliary shafts through bearings, one end of the auxiliary shaft located in the box cover is fixedly connected with a second gear, the second gear is engaged with the first gear, and the side wall of the auxiliary shaft located in the adsorption box is fixedly connected with a plurality of stirring plates.

[0017] Further, the power assembly comprises a threaded cylinder, the threaded cylinder is rotatably connected with the box cover through a bearing, the threaded cylinder is threadedly connected with a screw rod, the screw rod is fixedly connected with the sliding column through bolts, the threaded cylinder is fixedly connected with a main pulley, one end of the main shaft located outside the box cover is fixedly connected with a secondary pulley, and the main pulley and the secondary pulley are jointly and tightly connected with a synchronous belt.

[0018] Further, the adsorption mechanism comprises a plurality of electric heating plates, the electric heating plates are fixedly embedded on the inner side wall of the adsorption box, the bottom wall of the adsorption box is provided with a bottom cavity, the adsorption box is provided with a plurality of communication holes, the communication holes communicate the bottom cavity with the inside of the adsorption box, the communication holes are provided with filter screens, and the adsorption box is fixedly connected with two fourth pipes.

[0019] Further, the number of teeth of the first gear is greater than that of the second gear.

[0020] Further, the thread lifting of the screw rod is greater than the equivalent friction angle of the screw rod and the threaded cylinder.

[0021] The present application has the following advantages:

[0022] 1. The active carbon is used for adsorbing organic solvents, compared with the traditional combustion method, secondary pollution is avoided, and the organic solvents in the tail gas can be separated and recovered, so that the waste is recycled and waste is avoided.

[0023] 2. While the active carbon is used for adsorbing organic solvents, the tail gas enters the adsorption box through a gas passing cylinder and is discharged through another gas passing cylinder, and the use of the active carbon can be monitored by the pressure difference of the gas passing through the two gas passing cylinders. When the active carbon is saturated, another set of active carbon can be used for adsorption, so that the organic solvents in the tail gas can be effectively separated.

[0024] 3, the activated carbon rotating away from the gas cylinder is adsorbed, then it rotates to the heating plate, is heated through the heating plate, so that the activated carbon is desorbed at high temperature, and then the desorbed organic solvent is absorbed and treated through the fourth pipe, so that the activated carbon can be recycled in the device, without frequent replacement of activated carbon, so that the recovery efficiency is higher;

[0025] 4, in the activated carbon adsorption process, with the exhaust gas into and out, the lifting plate reciprocates up and down, drives the screw rod to move, through the threaded connection, the threaded cylinder rotates, and through the synchronous belt transmission and the meshing of the first gear and the second gear, the auxiliary shaft rotates, the auxiliary shaft stirs the activated carbon through the stirring plate, so that the exhaust gas fully contacts with the activated carbon, ensures the adsorption effect, and also can make the saturated activated carbon fully contact with the heating plate, ensures the desorption effect;

[0026] 5, the lifting plate is driven to move up and down by the pressure of the exhaust gas, and then the screw rod is driven to move, so that the stirring and replacement of the activated carbon do not need external power supply, the exhaust gas is fully utilized, and the device is more energy-saving;

[0027] 6, the device only needs to connect the exhaust gas, and the adsorption of the exhaust gas, dust treatment, replacement and desorption of the activated carbon can be automatically performed, without manual operation, so that the automation degree of the device is higher. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0029] Figure 2 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0030] Figure 3 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application; Figure 2 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0031] Figure 4 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application; Figure 2 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0032] Figure 5 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0033] Figure 6 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0034] Figure 7 A structure diagram of a dry vacuum pump exhaust gas organic solvent separation and recovery device is provided in the present application;

[0035] In the figure: 1 air inlet box, 2 dust removal box, 3 adsorption box, 4 box cover, 5 air passing cylinder, 101 transfer block, 102 first pipe, 103 second pipe, 104 lifting plate, 105 third pipe, 106 first electromagnetic valve, 107 second electromagnetic valve, 108 slide column, 109 first switch, 110 second switch, 201 preparation cavity, 202 separation cavity, 203 storage box, 301 electric heating plate, 302 bottom cavity, 303 communication hole, 304 filter screen, 305 fourth pipe, 401 main shaft, 402 first gear, 403 electric clutch, 404 rotating plate, 405 secondary shaft, 406 second gear, 407 threaded cylinder, 408 screw rod, 409 main pulley, 410 secondary pulley, 411 synchronous belt, 412 partition plate, 413 stirring plate, 501 sliding groove, 502 pressure block, 503 first spring, 504 fifth pipe, 505 differential pressure sensor, 506 piston, 507 second spring. DETAILED DESCRIPTION

[0036] REFERENCE Figures 1-7 A dry vacuum pump tail gas organic solvent separation and recovery device, comprising an air inlet box 1, a dust removal box 2, an adsorption box 3, a box cover 4 and two air passing cylinders 5, the air inlet box 1 and the box cover 4 are hollow structures, and the cross section of the adsorption box 3 is a concave shape with an opening facing upward;

[0037] An air inlet mechanism is arranged at the air inlet box 1, the air inlet mechanism is composed of an air passing assembly and a control assembly, the air passing assembly is used for tail gas to enter, and the control assembly is used for controlling the air inlet direction, the control assembly comprises a lifting plate 104, the lifting plate 104 is sealingly and slidingly connected in the air inlet box 1, and a slide column 108 is fixedly connected to the upper surface of the lifting plate 104;

[0038] A dust removal mechanism is arranged in the dust removal box 2, which is used for separating and removing dust in the tail gas;

[0039] An adsorption mechanism is arranged in the adsorption box 3, which is used for adsorbing and separating organic solvents in the tail gas;

[0040] A driving mechanism is arranged in the box cover 4, the driving mechanism is composed of a separation assembly and a power assembly, the separation assembly is used for separating the adsorption material into multiple groups, and the power assembly is used for providing operating power, and the separation assembly comprises a main shaft 401;

[0041] A monitoring mechanism is arranged at the air passing cylinder 5, which is used for monitoring the adsorption state of the adsorption material, the monitoring mechanism comprises a fifth pipe 504, the fifth pipe 504 is fixedly connected with the air passing cylinder 5, and a differential pressure sensor 505 is arranged in the fifth pipe 504.

[0042] The air passing assembly comprises a hollow transfer block 101 fixedly connected with the side wall of the air inlet tank 1, the air inlet tank 1 is fixedly connected with the dust removal tank 2, the side wall of the transfer block 101 is fixedly connected with a first pipe 102, the transfer block 101 and the air inlet tank 1 are fixedly connected with two second pipes 103, and the air inlet tank 1 and the dust removal tank 2 are fixedly connected with two third pipes 105.

[0043] The control assembly further comprises a first switch 109 and a second switch 110, the first switch 109 and the second switch 110 are fixedly connected with the inner top wall and the inner bottom wall of the air inlet tank 1 respectively, one of the second pipes 103 and the third pipes 105 is provided with a first electromagnetic valve 106, the other of the second pipes 103 and the third pipes 105 is provided with a second electromagnetic valve 107, the first electromagnetic valve 106 and the second electromagnetic valve 107 are electrically connected with the first switch 109 and the second switch 110 through wires, the first electromagnetic valve 106 is provided in the second pipe 103 and the third pipe 105 which are symmetrically inclined to each other, the second electromagnetic valve 107 is provided in the other second pipe 103 and the third pipe 105 which are symmetrically inclined to each other, the first electromagnetic valve 106 is a normally closed electromagnetic valve, and is opened by power supply, while the second electromagnetic valve 107 is a normally open electromagnetic valve, and is closed by power supply, after the first switch 109 is pressed, the first electromagnetic valve 106 and the second electromagnetic valve 107 are powered on, while after the second switch 110 is pressed, the first electromagnetic valve 106 and the second electromagnetic valve 107 are powered off, the tail gas is pumped into through the first pipe 102, after the tail gas enters the transfer block 101 through the first pipe 102, the tail gas enters the air inlet tank 1 through the upper second pipe 103, along with the pumping of the tail gas, the lifting plate 104 is lowered, at this time, the tail gas under the lifting plate 104 enters the preparation cavity 201 through the lower third pipe 105, and then enters the separation cavity 202 through the preparation cavity 201, along with the continuous pumping of the tail gas, the lifting plate 104 is continuously lowered, until the second switch 110 is contacted and pressed, at this time, the first electromagnetic valve 106 and the second electromagnetic valve 107 are powered off, the first electromagnetic valve 106 is closed by power off, and the second electromagnetic valve 107 is opened by power off, so that the tail gas enters the air inlet tank 1 from the lower second pipe 103 and enters the preparation cavity 201 from the upper third pipe 105 at this time, along with the upward movement of the lifting plate 104 to trigger the first switch 109, the air inlet of the upper second pipe 103 is changed, so that the lifting plate 104 reciprocates up and down, the lifting plate 104 reciprocates up and down is driven by the self-pressure of the tail gas, power is improved, the pressure in the tail gas is fully utilized, and the device is more energy-saving.

[0044] The dust removal mechanism comprises a preparation cavity 201 and a separation cavity 202, the preparation cavity 201 and the separation cavity 202 are both arranged in the dust removal box 2, the preparation cavity 201 communicates with the separation cavity 202, the third pipe 105 extends through to the preparation cavity 201, the lower surface of the dust removal box 2 is fixedly connected with a storage box 203, the separation cavity 202 communicates with the storage box 203, the separation cavity 202 is composed of a circular table-shaped cavity and a circular cone-shaped cavity, and the gas discharged from the preparation cavity 201 enters from one side of the separation cavity 202, after the tail gas enters the separation cavity 202, the tail gas is injected along the side wall of the separation cavity 202, at this time, the tail gas moves along the side wall of the separation cavity 202, under the action of centrifugal force and gravity, the dust will tightly adhere to the side wall of the separation cavity 202 and move downward, and fall into the storage box 203, and the tail gas will form a swirling upward airflow at the bottom of the separation cavity 202, enter the gas passing cylinder 5, so that the dust in the tail gas is separated.

[0045] The monitoring mechanism further comprises two pistons 506, the pistons 506 are sealingly and slidably connected in the fifth pipe 504, the gas passing cylinder 5 is fixedly connected with the adsorption box 3, and one of the gas passing cylinders 5 is fixedly connected with the dust removal box 2, the second spring 507 is fixedly connected between the piston 506 and the differential pressure sensor 505, and holes are formed in the side wall of the fifth pipe 504 (as shown in Figure 3 The holes enable the part between the piston 506 and the differential pressure sensor 505 to communicate with the outside, so that the sealingly and slidably connected piston 506 can freely slide, the inner side wall of the gas passing cylinder 5 is provided with a sliding groove 501, the gas passing cylinder 5 is sealingly and slidably connected with a pressure block 502 through the sliding groove 501, and the surface of the pressure block 502 facing the gas entering direction is a slope (as shown in Figure 2The pressure block 502 is fixedly connected with the inner side wall of the sliding groove 501, and a first spring 503 is arranged between the pressure block 502 and the inner side wall of the sliding groove 501. The stiffness coefficient of the first spring 503 is small, so the force of the gas overcoming the spring to make the pressure block 502 slide is also small, so that the pressure in the separation cavity 202 will not be too large, avoiding that the pressure is too large to form a swirling upward airflow. The pressure block 502 slides mainly to determine the pressure difference between the inlet and the outlet. The sliding groove 501 and the fifth pipe 504 are filled with hydraulic oil. After the tail gas enters the gas passing cylinder 5, the pressure of the tail gas acts on the pressure block 502, so that the pressure block 502 slides into the sliding groove 501, and the pressure is transmitted to the piston 506 through the hydraulic oil. The piston 506 will transmit the pressure to the pressure difference sensor 505 through the second spring 507. After the tail gas pushes away the pressure block 502, it will enter the adsorption box 3, and the organic solvent in the tail gas will be adsorbed by the activated carbon in the adsorption box 3, and then discharged from another gas passing cylinder 5. The pressure block 502 in the other gas passing cylinder 5 will transmit the gas pressure when the gas is discharged to another piston 506, so that the inlet pressure and the outlet pressure act on both sides of the pressure difference sensor 505. The inlet pressure and the outlet pressure are monitored by the pressure difference sensor 505, and the use status of the activated carbon is monitored in real time. When the adsorption is saturated, the activated carbon is replaced in time to avoid that the adsorption is saturated and cannot be effectively adsorbed, so that part of the harmful substances are discharged without being adsorbed, and the complete adsorption is ensured.

[0046] The box cover 4 is fixedly connected with the upper surface of the adsorption box 3 by bolts. The main shaft 401 is rotatably connected with the top wall of the box cover 4 by a bearing. One end of the main shaft 401 in the box cover 4 is fixedly connected with the first gear 402. The inner bottom wall of the box cover 4 is rotatably connected with the electric clutch 403 by a bearing. The electric clutch 403 is fixedly connected with the rotating plate 404. The lower surface of the rotating plate 404 is fixedly connected with the partition plate 412. The partition plate 412 divides the adsorption box 3 into four parts (as shown in Figure 6The rotating plate 404 is rotatably connected with a plurality of secondary shafts 405 through bearings, and the rotating connection between the rotating plate 404 and the secondary shafts 405 is provided with damping pads, so that there is friction between them. When the rotating plate 404 can rotate, the secondary shaft 405 cannot rotate. One end of the secondary shaft 405 fixedly connected in the box cover 4 is provided with a second gear 406, and the second gear 406 is engaged with the first gear 402. The side wall of the secondary shaft 405 in the adsorption box 3 is fixedly connected with a plurality of stirring plates 413. The electric clutch 403 is connected with the differential pressure sensor 505 through the PLC control circuit. After the electric clutch 403 is powered on, the electric clutch 403 can be combined with the box cover 4, and the power is disconnected. The differential pressure sensor 505 can control the on-off of the electric clutch 403 through the PLC control circuit. When the differential pressure reaches a certain degree, the electric clutch 403 is controlled to be powered off. It is prior art, and will not be repeated here. When the activated carbon adsorption is close to saturation, the pressure loss of the gas passing through the activated carbon will increase, thereby increasing the pressure difference between the inlet gas and the exhaust gas. When the differential pressure sensor 505 senses that the differential pressure reaches a certain degree, the electric clutch 403 is powered off, and the electric clutch 403 is disconnected with the box cover 4, so that the rotating plate 404 can rotate freely. At this time, the first gear 402 rotates, and the first gear 402 and the second gear 406 are relatively in the state of being clamped. The rotation of the first gear 402 drives the rotating plate 404 to rotate through the second gear 406, so that the partition plate 412 rotates, and the other group of activated carbon is rotated to the air cylinder 5 for adsorption. After the adsorption saturation is monitored, another group of activated carbon can be automatically replaced for adsorption, so as to ensure the complete adsorption of harmful substances in the tail gas, and greatly improve the automation degree of the device.

[0047] The power assembly includes a threaded cylinder 407 rotatably connected with the box cover 4 through bearings, a screw rod 408 threadedly connected with the threaded cylinder 407, the screw rod 408 fixedly connected with the slide column 108 through bolts, a main pulley 409 fixedly connected with the threaded cylinder 407, a secondary pulley 410 fixedly connected with one end of the main shaft 401 outside the box cover 4, and a synchronous belt 411 commonly tensioned with the main pulley 409 and the secondary pulley 410.

[0048] The adsorption mechanism includes a plurality of electric heating plates 301 fixedly embedded on the inner side wall of the adsorption box 3. The electric heating plates 301 can heat the activated carbon after being powered on. It is provided with three (such as Figure 6The group of activated carbon that is being adsorbed is not heated, the bottom wall of the adsorption box 3 is provided with a bottom cavity 302, the adsorption box 3 is provided with a plurality of communication holes 303, the communication holes 303 communicate the bottom cavity 302 with the inside of the adsorption box 3, the communication holes 303 are provided with filter screens 304, two fourth pipes 305 are fixedly connected to the adsorption box 3 in a penetrating mode, one of the fourth pipes 305 is used for feeding inert gas, and the other fourth pipe 305 is connected with the air pump and used for sucking out the desorbed organic solvent for subsequent treatment, the fourth pipe 305 extends into the bottom cavity 302 in a penetrating mode, the adsorption box 3 is filled with activated carbon, and the activated carbon that rotates away from the air cylinder 5 is heated by the electric heating plate 301, the activated carbon is desorbed through high-temperature heating, and then the desorbed organic solvent is extracted through the fourth pipe 305, and further purification can be carried out, the activated carbon can be recycled through heating and desorption, so that the device does not need to frequently replace activated carbon, and the tail gas treatment efficiency is greatly improved.

[0049] The number of teeth of the first gear 402 is greater than the number of teeth of the second gear 406, so that when the first gear 402 rotates, the second gear 406 is driven to rotate at a high speed, thereby improving the stirring speed.

[0050] The thread lifting of the screw rod 408 is greater than the equivalent friction angle of the screw pair composed of the screw rod 408 and the threaded cylinder 407, so that the threaded connection of the screw rod 408 and the threaded cylinder 407 is not self-locking, thereby ensuring that the upward and downward movement of the screw rod 408 can drive the threaded cylinder 407 to rotate.

[0051] In the application, the tail gas is pumped into the first pipe 102, and then enters the air inlet box 1 through the upper second pipe 103 after entering the transfer block 101. With the pumping of the tail gas, the lifting plate 104 is lowered. At this time, the tail gas below the lifting plate 104 enters the preparation cavity 201 through the lower third pipe 105, and then enters the separation cavity 202 through the preparation cavity 201. With the continuous pumping of the tail gas, the lifting plate 104 continuously lowers until it contacts and presses the second switch 110. At this time, the first electromagnetic valve 106 and the second electromagnetic valve 107 are powered off, the first electromagnetic valve 106 is closed, and the second electromagnetic valve 107 is opened, so that the tail gas enters the air inlet box 1 from the lower second pipe 103 and enters the preparation cavity 201 from the upper third pipe 105 at this time. With the upward movement of the lifting plate 104 triggering the first switch 109, the air inlet of the upper second pipe 103 is changed, so that the lifting plate 104 reciprocates up and down.

[0052] After the exhaust gas enters the separation cavity 202 from the preparation cavity 201, it is injected along the side wall of the separation cavity 202, and at this time, the exhaust gas moves along the side wall of the separation cavity 202, and in the process of movement, under the action of centrifugal force and gravity, the dust will tightly adhere to the side wall of the separation cavity 202 and move downward and fall into the storage box 203, while the exhaust gas at the bottom of the separation cavity 202 will form a swirling upward airflow and enter the air cylinder 5, thereby separating the dust in the exhaust gas;

[0053] After the exhaust gas enters the air cylinder 5, the pressure of the exhaust gas acts on the pressure block 502, causing the pressure block 502 to slide into the sliding groove 501, and the pressure is transmitted to the piston 506 through the hydraulic oil, and the piston 506 will transmit the pressure to the differential pressure sensor 505 through the second spring 507. After the exhaust gas pushes open the pressure block 502, it will enter the adsorption box 3, and the organic solvent in the exhaust gas will be adsorbed by the activated carbon inside, and then discharged from another air cylinder 5, while the pressure block 502 in the other air cylinder 5 will transmit the gas pressure during gas discharge to another piston 506, so that the inlet pressure and the outlet pressure act on both sides of the differential pressure sensor 505, and the inlet pressure and the outlet pressure are monitored by the differential pressure sensor 505.

[0054] During the adsorption process, the up-and-down movement of the lifting plate 104 drives the sliding column 108 to move up and down, thereby causing the screw rod 408 to move up and down, and the up-and-down movement of the screw rod 408 drives the threaded cylinder 407 to rotate through the threaded connection, and the threaded cylinder 407 drives the main pulley 409 to rotate, and the main pulley 409 drives the secondary pulley 410 to rotate through the synchronous belt 411, thereby causing the main shaft 401 to rotate, and the main shaft 401 drives the first gear 402 to rotate, and since the electric clutch 403 is in an energized state at this time, the electric clutch 403 is in a combined state with the box cover 4 and cannot rotate, so that the rotating plate 404 cannot rotate, and at this time, the first gear 402 drives the second gear 406 engaged therewith to rotate, thereby causing the secondary shaft 405 to rotate and driving the agitating plate 413 to rotate, constantly agitating the activated carbon, so that the incoming exhaust gas is fully contacted with the activated carbon for adsorption.

[0055] As the activated carbon adsorbs the organic solvent, when the activated carbon adsorption approaches saturation, the pressure loss of the gas passing through the activated carbon will increase, thereby increasing the pressure difference between the inlet and the outlet, and when the pressure difference sensed by the pressure difference sensor 505 reaches a certain level, the electric clutch 403 will be powered off, at which time the electric clutch 403 is disconnected from the box cover 4, so that the rotating plate 404 can rotate freely, and at this time the first gear 402 rotates, and because there is friction between the secondary shaft 405 and the rotating plate 404, the first gear 402 and the second gear 406 are in a clamped state, and the rotation of the first gear 402 drives the rotating plate 404 to rotate directly through the second gear 406, thereby causing the partition plate 412 to rotate and rotating another set of activated carbon to the air cylinder 5 for adsorption.

[0056] The activated carbon rotating away from the air cylinder 5 is heated by the electric heating plate 301, and the high-temperature heating causes the activated carbon to desorb, and then the desorbed organic solvent is extracted through the fourth pipe 305 for further purification.

Claims

1. A dry vacuum pump tail gas organic solvent separation and recovery device, comprising an air inlet box (1), a dust removal box (2), an adsorption box (3), a box cover (4) and two air passing cylinders (5), characterized in that, The air inlet tank (1) and the tank cover (4) are hollow structures, and the cross section of the adsorption tank (3) is a concave shape with an opening facing upward. An air inlet mechanism is arranged at the air inlet tank (1), which is composed of an air passing assembly and a control assembly. The air passing assembly is used for tail gas to enter, and the control assembly is used for controlling the air inlet direction. The control assembly includes a lifting plate (104) which is sealingly and slidingly connected in the air inlet tank (1). The upper surface of the lifting plate (104) is fixedly connected with a sliding column (108). A dust removal mechanism is arranged in the dust removal tank (2), which is used for separating and removing dust in the tail gas. An adsorption mechanism is arranged in the adsorption tank (3), which is used for adsorbing and separating organic solvents in the tail gas. A driving mechanism is arranged in the tank cover (4), which is composed of a separation assembly and a power assembly. The separation assembly is used for separating the adsorption material into multiple groups, and the power assembly is used for providing operating power. The separation assembly includes a main shaft (401). A monitoring mechanism is arranged at the air passing cylinder (5), which is used for monitoring the adsorption condition of the adsorption material. The monitoring mechanism includes a fifth pipe (504) which is fixedly connected with the air passing cylinder (5). A differential pressure sensor (505) is arranged in the fifth pipe (504).

2. The device according to claim 1, characterized in that, The air passing assembly includes a hollow transfer block (101) which is fixedly connected with the side wall of the air inlet tank (1). The air inlet tank (1) is fixedly connected with the dust removal tank (2). The side wall of the transfer block (101) is fixedly connected with a first pipe (102). The transfer block (101) and the air inlet tank (1) are fixedly connected with two second pipes (103) in common. The air inlet tank (1) and the dust removal tank (2) are fixedly connected with two third pipes (105) in common. The connection positions of the two third pipes (105) with the air inlet tank (1) are located on the upper and lower sides of the lifting plate (104) respectively.

3. The device according to claim 2, characterized in that, The control assembly further includes a first switch (109) and a second switch (110) which are fixedly connected with the inner top wall and the inner bottom wall of the air inlet tank (1) respectively. One of the second pipes (103) and the third pipes (105) is provided with a first electromagnetic valve (106), and the other one is provided with a second electromagnetic valve (107). The first electromagnetic valve (106) and the second electromagnetic valve (107) are electrically connected with the first switch (109) and the second switch (110) through wires.

4. The device according to claim 3, characterized in that, The dust removal mechanism includes a preparation cavity (201) and a separation cavity (202) which are both arranged in the dust removal tank (2). The preparation cavity (201) is in communication with the separation cavity (202). The third pipe (105) extends through the preparation cavity (201). The lower surface of the dust removal tank (2) is fixedly connected with a storage tank (203). The separation cavity (202) is in communication with the storage tank (203).

5. The device according to claim 1, wherein The monitoring mechanism further comprises two pistons (506) sealingly and slidably connected in a fifth pipe (504), one of the gas passing cylinders (5) is fixedly connected with the dust removal box (2), a second spring (507) is fixedly connected between the piston (506) and the pressure difference sensor (505), a sliding groove (501) is formed in the inner wall of the gas passing cylinder (5), a pressure block (502) is sealingly and slidably connected in the sliding groove (501) of the gas passing cylinder (5), a first spring (503) is fixedly connected between the pressure block (502) and the inner wall of the sliding groove (501), and the sliding groove (501) and the fifth pipe (504) are filled with hydraulic oil.

6. The device according to claim 1, wherein The box cover (4) is fixedly connected with the upper surface of the adsorption box (3) by bolts, the main shaft (401) is rotatably connected with the top wall of the box cover (4) through bearings, one end of the main shaft (401) located in the box cover (4) is fixedly connected with a first gear (402), the inner bottom wall of the box cover (4) is rotatably connected with an electric clutch (403) through bearings, the electric clutch (403) is fixedly connected with a rotating plate (404), the lower surface of the rotating plate (404) is fixedly connected with a partition plate (412), the rotating plate (404) is rotatably connected with a plurality of auxiliary shafts (405) through bearings, one end of the auxiliary shaft (405) located in the box cover (4) is fixedly connected with a second gear (406), the second gear (406) is engaged with the first gear (402), and the side wall of the auxiliary shaft (405) located in the adsorption box (3) is fixedly connected with a plurality of stirring plates (413). The electric clutch (403) and the pressure difference sensor (505) are connected through a PLC control circuit.

7. The device according to claim 1, wherein The power assembly comprises a threaded cylinder (407), the threaded cylinder (407) is rotatably connected with the box cover (4) through bearings, the threaded cylinder (407) is threadedly connected with a screw rod (408), the screw rod (408) is fixedly connected with the sliding column (108) through bolts, the threaded cylinder (407) is fixedly connected with a main pulley (409), one end of the main shaft (401) located outside the box cover (4) is fixedly connected with an auxiliary pulley (410), and the main pulley (409) and the auxiliary pulley (410) are jointly and tightly connected with a synchronous belt (411).

8. The device according to claim 1, characterized in that, The adsorption mechanism comprises a plurality of electric heating plates (301), the electric heating plates (301) are fixedly embedded on the inner side wall of the adsorption box (3), a bottom cavity (302) is formed in the bottom wall of the adsorption box (3), a plurality of communication holes (303) are formed in the adsorption box (3), the communication holes (303) communicate the bottom cavity (302) with the inside of the adsorption box (3), a filter screen (304) is arranged in the communication hole (303), the adsorption box (3) is fixedly connected with two fourth pipes (305), the fourth pipes (305) extend into the bottom cavity (302), and the adsorption box (3) is filled with activated carbon.

9. The device according to claim 6, characterized in that, The first gear (402) has a number of teeth greater than the number of teeth of the second gear (406).

10. The apparatus according to claim 7, wherein The thread lift of the screw (408) is greater than the equivalent friction angle of the screw (408) and the threaded cylinder (407) forming a screw pair.

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