CN220142939U - Laboratory exhaust gas purification device - Google Patents

Abstract

The utility model provides a laboratory waste gas purifying device, which relates to the technical field of waste gas purification and comprises a shell, wherein an installation cavity is formed in the shell, an air inlet component is arranged outside the shell, the air inlet component is communicated with the installation cavity, and the air inlet component is used for conveying waste gas into the shell; the installation cavity is also internally provided with a purification component which is used for purifying the waste gas conveyed by the air inlet component; the top of the shell is provided with an exhaust assembly which is communicated with the mounting cavity and is used for discharging purified waste gas; the exhaust assembly is provided with a first input end and a first output end, wherein the first input end is provided with a check valve which is used for preventing waste gas from flowing back; through the structure, when the power of the exhaust fan is low or the exhaust fan is closed, the check valve is opened, and harmful gas and/or harmful particles in the pipeline cannot flow back into a laboratory after the exhaust fan stops or the indoor and outdoor air pressure changes, so that the health of detection personnel and the environment of the laboratory are ensured.

Description

Laboratory exhaust gas purification device

Technical Field

The present disclosure relates generally to the field of exhaust gas purification technology, and in particular, to a laboratory exhaust gas purification apparatus.

Background

In order to ensure that laboratory staff does not inhale or ingest toxic, pathogenic or unidentified chemical substances and organisms and should have good ventilation in a laboratory, along with the rapid development of socioeconomic, a fume hood is a device for discharging waste gas applied in the laboratory, and waste gas generated by the laboratory experiment is pumped out of the laboratory by using the fume hood, so that the waste gas is prevented from spreading into the laboratory, and the damage to the body of the laboratory staff is reduced;

however, in the prior art, the fume hood cannot isolate harmful air well, and because the power of the exhaust fan is low or the exhaust fan is closed, harmful gas and/or harmful particles in the pipeline still flow back, thereby affecting the health of detection personnel and the environment of a laboratory.

Disclosure of Invention

In view of the above-described drawbacks or shortcomings in the prior art, it is desirable to provide a laboratory exhaust gas purifying apparatus that can solve the above-described technical problems.

The present utility model provides a laboratory exhaust gas purifying apparatus, comprising:

the shell is internally provided with an installation cavity;

the air inlet assembly is arranged outside the shell and communicated with the mounting cavity, and is used for conveying waste gas into the shell;

the purification assembly is arranged in the installation cavity and is used for purifying the waste gas conveyed by the air inlet assembly;

the exhaust assembly is arranged at the top of the shell and is communicated with the mounting cavity, and is used for discharging purified waste gas and discharging the purified waste gas; the exhaust assembly has a first input and a first output, the first input being provided with a non-return valve for preventing backflow of the exhaust gas.

According to the technical scheme provided by the embodiment of the utility model, the exhaust assembly comprises an exhaust pipe, an exhaust port is arranged at the top of the shell, the exhaust pipe is communicated with the installation cavity through the exhaust port, a first detachable filter screen is arranged at the first output end, and the first filter screen is used for adsorbing residual particles in exhaust gas discharged by the exhaust pipe.

According to the technical scheme provided by the embodiment of the utility model, the inner wall of the mounting cavity is provided with the absorption liquid box, the absorption liquid box is positioned at the exhaust port, absorption liquid is arranged in the absorption liquid box, one side of the absorption liquid box is provided with the inlet, and the inlet is positioned above the absorption liquid; the first input end passes through the exhaust port and enters the absorption liquid.

According to the technical scheme provided by the embodiment of the utility model, the air inlet assembly comprises: an air inlet pipe, an exhaust fan and an air collecting cover; one side of the shell is provided with an air inlet, the air inlet pipe is communicated with the mounting cavity through the air inlet, an exhaust fan is embedded in the air inlet pipe, and one end, far away from the shell, of the air inlet pipe is communicated with a gas collecting hood.

According to the technical scheme provided by the embodiment of the utility model, the purifying component comprises: an air filter screen and an activated carbon filter screen; the air filter screen is arranged in the installation cavity and is positioned above the air inlet; the active carbon filter screen is arranged above the air filter screen.

According to the technical scheme provided by the embodiment of the utility model, the shell is provided with the cleaning component, and the cleaning component is used for cleaning the air filter screen; the bottom of one side of the casing, which is far away from the air inlet pipe, is provided with a pollution discharge assembly.

According to the technical scheme provided by the embodiment of the utility model, the cleaning assembly comprises:

the threaded rod is arranged in the mounting cavity along the first direction and is positioned above the air filter screen, one end of the threaded rod is rotatably connected with the inner wall of the shell, the other end of the threaded rod penetrates through the shell to be connected with a first driving motor, and the first driving motor is arranged on the outer wall of the shell; the threaded rod is connected with a sliding block through threads;

the cleaning brush is arranged at the bottom of the sliding block and is abutted with the air filter screen;

the liquid storage tank is arranged on one side of the shell, the output end of the liquid storage tank is connected with a water pump, the other end of the water pump is connected with a telescopic pipe, and the other end of the telescopic pipe extends into the mounting cavity;

the spray head is fixedly arranged on the sliding block, and the spray head is connected with one end of the telescopic pipe extending into the mounting cavity.

According to the technical scheme provided by the embodiment of the utility model, the sewage disposal assembly comprises: the sewage disposal device comprises a sewage disposal pipe and a sewage disposal valve, wherein the sewage disposal pipe is arranged at the bottom of one side of the shell away from the air inlet pipe, and the outside of the sewage disposal pipe is provided with the sewage disposal valve.

According to the technical scheme provided by the embodiment of the utility model, a baffle plate is arranged on the inner wall of the shell and positioned at the air inlet along the second direction, a second driving motor is arranged on the outer wall of the shell, the driving end of the second driving motor is connected with one side of the baffle plate along the second direction, and the second driving motor is used for driving the baffle plate to rotate around the third direction; the second driving motor has a first state and a second state; when the air inlet is in the first state, the second driving motor drives the baffle to approach and shield the air inlet; when in the second state, the second driving motor drives the baffle plate to be far away from the air inlet; the second direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

According to the technical scheme provided by the embodiment of the utility model, the ultraviolet sterilizing lamp is fixedly arranged at the top of the inner side of the shell.

The utility model has the beneficial effects that:

the utility model provides a laboratory waste gas purifying device, which comprises a shell, wherein an installation cavity is formed in the shell, an air inlet assembly is arranged outside the shell, the air inlet assembly is communicated with the installation cavity, and the air inlet assembly is used for conveying waste gas into the shell; the installation cavity is internally provided with a purification component which is used for purifying the waste gas conveyed by the air inlet component; an exhaust component is arranged at the top of the shell and communicated with the mounting cavity, and the exhaust component is used for exhausting the purified waste gas; the exhaust assembly has a first input end and a first output end, the first input end is provided with a check valve, and the check valve is used for preventing the exhaust gas from flowing back; through the structure, when the air inlet component stops air inlet, the check valve is opened, and harmful gas and/or harmful particles in the pipeline cannot flow back into a laboratory after the exhaust fan of the air inlet component stops or the indoor and outdoor air pressure changes, so that the health of detection personnel and the environment of the laboratory are ensured.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

fig. 1 is a sectional view of a laboratory exhaust gas purifying apparatus in the present utility model;

FIG. 2 is a schematic view of a laboratory exhaust gas purifying apparatus according to the present utility model;

in the figure: 1. a housing; 2. an air intake assembly; 21. an air inlet pipe; 22. an exhaust fan; 23. a gas collecting hood; 3. an exhaust assembly; 31. a non-return valve; 32. an exhaust pipe; 33. a first filter screen; 4. an absorption liquid box; 41. an inlet; 5. an air filter screen; 6. an activated carbon filter screen; 7. a threaded rod; 8. a first driving motor; 9. a cleaning brush; 10. a slide block; 11. a liquid storage tank; 12. a water pump; 13. a telescopic tube; 14. a spray head; 15. a blowdown assembly; 151. a blow-down pipe; 152. a blow-down valve; 16. a baffle plate; 17. an ultraviolet germicidal lamp; 18. and (5) a door plate.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

Referring to fig. 1, a schematic diagram of a laboratory exhaust gas purifying apparatus according to the present utility model includes:

a housing 1, wherein a mounting cavity is arranged inside the housing 1;

an air inlet assembly 2, wherein the air inlet assembly 2 is arranged outside the shell 1 and is communicated with the mounting cavity, and the air inlet assembly 2 is used for conveying waste gas into the shell 1;

the purification assembly is arranged in the installation cavity and is used for purifying the waste gas conveyed by the air inlet assembly 2;

an exhaust assembly 3, wherein the exhaust assembly 3 is arranged at the top of the shell 1 and is communicated with the mounting cavity, the exhaust assembly 3 is used for discharging purified waste gas, and the exhaust assembly 3 is used for discharging the purified waste gas; the exhaust assembly 3 has a first input and a first output, the first input being provided with a non-return valve 31, the non-return valve 31 being adapted to prevent backflow of the exhaust gases.

Specifically, the exhaust gas enters the housing 1 from the air inlet assembly 2, passes through the purification assembly to purify harmful substances in the exhaust gas, and is discharged from the exhaust assembly 3;

working principle: the exhaust gas enters the shell 1 from the air inlet component 2, and harmful substances in the exhaust gas are purified by the purifying component and discharged from the exhaust component 3; when the intake assembly stops intake, the check valve 31 is opened, and harmful gases and/or harmful particles in the pipeline cannot flow back into the laboratory after the exhaust fan 22 of the intake assembly 2 stops or the indoor and outdoor air pressure changes, so that the health of detection personnel and the environment of the laboratory are ensured.

In some embodiments, the exhaust assembly 3 includes an exhaust pipe 32, an exhaust port is disposed at the top of the housing 1, the exhaust pipe 32 is communicated with the installation cavity through the exhaust port, and the first output end is provided with a detachable first filter screen 33, and the first filter screen 33 is used for adsorbing residual particulate matters in exhaust gas discharged from the exhaust pipe 32.

Specifically, as shown in fig. 1, the exhaust assembly 3 includes an exhaust pipe 32, an exhaust port is provided at the top of the housing 1, the exhaust pipe 32 is communicated with the installation cavity through the exhaust port, the first output end is provided with a detachable first filter screen 33, when solid particles remain in the exhaust gas purified by the purification assembly, the exhaust gas is discharged from the first output end, and the first filter screen 33 adsorbs the residual solid particles, so as to ensure the clean laboratory environment; meanwhile, the first filter screen 33 is detachably disposed at the first output end, and the first filter screen 33 can be replaced periodically, so that the filtering effect of the first filter screen 33 is ensured.

In some embodiments, an absorption liquid box 4 is arranged on the inner wall of the installation cavity, the absorption liquid box 4 is positioned at the exhaust port, absorption liquid is arranged in the absorption liquid box 4, an inlet 41 is arranged at one side of the absorption liquid box 4, and the inlet 41 is positioned above the absorption liquid; the first input end passes through the exhaust port and enters the absorption liquid.

Specifically, as shown in fig. 2, a door plate 18 capable of being opened in a rotating way is arranged at one side of the casing 1, so that the device inside the casing 1 can be replaced conveniently;

specifically, an absorption liquid box 4 is arranged on the inner wall of the installation cavity, the absorption liquid box 4 is positioned at the exhaust port, an inlet 41 is arranged at one side of the absorption liquid box 4, and the inlet 41 is positioned above the absorption liquid; the first input end passes through the exhaust port and enters the absorption liquid; waste gas after purification by the purification assembly enters the absorption liquid box 4 through the inlet 41, harmful substances are absorbed by the absorption liquid, and the absorbed waste gas is discharged after entering the exhaust pipe 32 from the first input end, so that the purposes of green and environment protection are realized, the emission of harmful gases is reduced, and the health of detection personnel and the environment of a laboratory are further ensured.

In certain embodiments, the intake assembly 2 comprises: an intake duct 21, an exhaust fan 22, and a gas collecting hood 23; one side of the shell 1 is provided with an air inlet, the air inlet pipe 21 is communicated with the mounting cavity through the air inlet, an exhaust fan 22 is embedded in the air inlet pipe 21, and one end, far away from the shell 1, of the air inlet pipe 21 is communicated with a gas collecting hood 23.

Specifically, when the experiment is performed, the gas collecting hood 23 is placed on a laboratory console, the exhaust fan 22 is started, and exhaust gas generated during the experiment can enter the housing 1 along the gas inlet pipe 21 for purification treatment.

In certain embodiments, the purification assembly comprises: an air filter screen 5 and an activated carbon filter screen 6; the air filter screen 5 is arranged in the installation cavity and is positioned above the air inlet; the activated carbon filter screen 6 is arranged above the air filter screen 5.

Specifically, the purification component comprises an air filter screen 5 and an activated carbon filter screen 6, wherein the air filter screen 5 is arranged in the installation cavity and is positioned above the air inlet; the active carbon filter screen 6 is arranged above the air filter screen 5; the exhaust gas enters the shell 1 from the exhaust pipe 32, and passes through the air filter screen 5, dust and impurities in the exhaust gas are filtered and intercepted by the air filter screen 5, and then passes through the activated carbon filter screen 6, and the activated carbon filter screen 6 can adsorb harmful organic compounds in the exhaust gas.

In some embodiments, a cleaning assembly is provided on the housing 1, the cleaning assembly being used to clean the air filter screen 5; the bottom of the side of the housing 1 remote from the inlet pipe 21 is provided with a drain assembly 15.

Specifically, since the air filter 5 is used for intercepting dust and impurities in the exhaust gas, the air filter 5 is cleaned periodically by a cleaning assembly, and the medium for cleaning the air filter 5 is discharged from the pollution discharge assembly 15.

In certain embodiments, the cleaning assembly comprises:

the threaded rod 7 is arranged in the installation cavity along the first direction and is positioned above the air filter screen 5, one end of the threaded rod 7 is rotatably connected with the inner wall of the shell 1, the other end of the threaded rod 7 penetrates through the shell 1 and is connected with a first driving motor 8, and the first driving motor 8 is arranged on the outer wall of the shell 1; the threaded rod 7 is connected with a sliding block 10 in a threaded manner;

the cleaning brush 9 is arranged at the bottom of the sliding block 10, and the cleaning brush 9 is abutted with the air filter screen 5;

the liquid storage tank 11 is arranged on one side of the shell 1, the output end of the liquid storage tank 11 is connected with the water pump 12, the other end of the water pump 12 is connected with the telescopic pipe 13, and the other end of the telescopic pipe 13 extends into the installation cavity;

the spray head 14 is fixedly arranged on the sliding block 10, and the spray head 14 is connected with one end of the telescopic pipe 13 extending into the installation cavity.

Specifically, the first direction is a horizontal direction;

specifically, a blind hole is formed in the inner wall of the casing 1 corresponding to the threaded rod 7, one end of the threaded rod 7 extends into the blind hole, and the threaded rod 7 is rotatably connected with the casing 1 through a bearing;

specifically, when the air filter 5 needs to be cleaned, the water pump 12 can be started to convey the water in the liquid storage tank 11 to the spray head 14 to spray the water to the air filter 5, then the first driving motor 8 is started, the first driving motor 8 drives the threaded rod 7 to rotate, the threaded rod 7 drives the sliding block 10 to drive the cleaning brush 9 to move along the first direction to brush the air filter 5, and the air filter 5 is flushed; meanwhile, since the telescopic tube 13 is disposed between the spray head 14 and the water pump 12, the telescopic tube 13 is adapted to be telescopic when the slider 10 moves in the first direction.

In certain embodiments, the drain assembly 15 comprises: a drain pipe 151 and a drain valve 152, the drain pipe 151 is disposed at the bottom of the side of the housing 1 away from the intake pipe 21, and the drain valve 152 is disposed at the outer side of the drain pipe 151.

Specifically, the sewage disposal assembly 15 includes: a drain pipe 151 and a drain valve 152, the drain pipe 151 being disposed at the bottom of the side of the housing 1 remote from the intake pipe 21, the drain valve 152 being disposed outside the drain pipe 151; when the air filter 5 is cleaned, the drain valve 152 is opened, and the sewage generated by cleaning the air filter 5 in the housing 1 can be discharged along the drain pipe 151.

In some embodiments, a baffle 16 is disposed on the inner wall of the housing 1 and located at the air inlet along a second direction, a second driving motor is disposed on the outer wall of the housing 1, a driving end of the second driving motor is connected to one side of the baffle 16 along the second direction, and the second driving motor is used for driving the baffle 16 to rotate around a third direction; the second driving motor has a first state and a second state; when in the first state, the second driving motor drives the baffle 16 to approach and shade the air inlet; in the second state, the second driving motor drives the baffle 16 away from the air inlet; the second direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

Specifically, the second direction is a vertical direction, and the third direction is a horizontal direction;

specifically, the second driving motor is connected to one side of the baffle 16 near the inner wall of the bottom of the casing 1; when the exhaust assembly 3 conveys exhaust gas into the housing 1, the second driving motor is in the second state, the second driving motor drives the baffle 16 to be far away from the air inlet, and the exhaust gas enters the housing 1 from the air inlet; when the cleaning assembly is adopted to clean the air filter screen 5, the second driving motor is in a first state, the baffle 16 is driven by the second driving motor to rotate around the third direction, and the air inlet is closed and shielded, so that sewage generated by the cleaning assembly washing the air filter screen 5 is discharged along the drain pipe 151 and cannot enter the air inlet pipe 21, and pollution to the air inlet pipe 21 caused by the sewage is prevented.

In some embodiments, the top of the inner side of the shell 1 is fixedly provided with an ultraviolet sterilizing lamp 17.

Specifically, the ultraviolet germicidal lamp 17 is turned on to perform the sterilization operation of the exhaust gas.

The working flow is as follows: when in experiment, the gas collecting hood 23 is placed on an operation desk of a laboratory, the exhaust fan 22 is started, waste gas generated during the experiment can enter the shell 1 along the gas inlet pipe 21, the waste gas firstly passes through the air filter screen 5 after entering the shell 1, the air filter screen 5 filters and intercepts dust and impurities in the waste gas, and then passes through the activated carbon filter screen 6, and the activated carbon filter screen 6 can adsorb harmful organic compounds in the waste gas; and the ultraviolet sterilizing lamp 17 is started to perform the sterilizing operation of the waste gas; the waste gas then enters the absorption liquid box 4 through the inlet 41, and the absorption liquid absorbs harmful substances so as to achieve the purposes of environmental protection and further reducing the emission of the harmful gases; the absorbed waste gas enters the exhaust pipe 32 from the first input end, and then the residual solid particles in the waste gas are absorbed through the first filter screen 33, so that the laboratory environment is not polluted; when the power of the exhaust fan 22 is low or the exhaust fan 22 is closed, the check valve 31 is opened, and after the exhaust fan 22 of the air inlet assembly 2 stops or the indoor and outdoor air pressure changes, harmful gases and/or harmful particles in the pipeline cannot flow back into a laboratory, so that the health of detection personnel and the environment of the laboratory are ensured;

after the experiment is completed, the air filter screen 5 is cleaned, the second driving motor is in a first state, and drives the baffle 16 to rotate around the third direction, and the baffle approaches and shields the air inlet; then, the water pump 12 is started to convey water in the liquid storage tank 11 to the spray head 14 to spray the water to the air filter screen 5, then the first driving motor 8 is started, the first driving motor 8 rotates with the threaded rod 7, the threaded rod 7 drives the sliding block 10 to move along the cleaning brush 9 to brush the air filter screen 5 along the first direction, and the air filter screen 5 is flushed; meanwhile, since the telescopic tube 13 is arranged between the spray head 14 and the water pump 12, when the sliding block 10 moves along the first direction, the telescopic tube 13 is adaptively telescopic; when the air filter 5 is cleaned, the drain valve 152 is opened, and the sewage generated by cleaning the air filter 5 in the housing 1 can be discharged along the drain pipe 151.

The above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in the present utility model is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions are replaced with each other.

Claims (10)

1. A laboratory exhaust gas purifying apparatus, comprising:

the device comprises a shell (1), wherein an installation cavity is formed in the shell (1);

the air inlet assembly (2) is arranged outside the shell (1) and is communicated with the mounting cavity, and the air inlet assembly (2) is used for conveying waste gas into the shell (1);

the purification assembly is arranged in the installation cavity and is used for purifying the waste gas conveyed by the air inlet assembly (2);

the exhaust assembly (3) is arranged at the top of the shell (1) and is communicated with the mounting cavity, the exhaust assembly (3) is used for discharging purified waste gas, and the exhaust assembly (3) is used for discharging the purified waste gas; the exhaust assembly (3) has a first input and a first output, the first input being provided with a non-return valve (31), the non-return valve (31) being for preventing backflow of the exhaust gases.

2. Laboratory exhaust gas purification device according to claim 1, characterized in that the exhaust assembly (3) comprises an exhaust pipe (32), the top of the housing (1) is provided with an exhaust port, the exhaust pipe (32) is in communication with the installation cavity through the exhaust port, the first output end is provided with a detachable first filter screen (33), the first filter screen (33) is used for adsorbing residual particles in exhaust gas discharged from the exhaust pipe (32).

3. Laboratory exhaust gas purification device according to claim 2, characterized in that an absorption liquid box (4) is arranged on the inner wall of the installation cavity, the absorption liquid box (4) is positioned at the exhaust port, absorption liquid is arranged in the absorption liquid box (4), an inlet (41) is arranged on one side of the absorption liquid box (4), and the inlet (41) is positioned above the absorption liquid; the first input end passes through the exhaust port and enters the absorption liquid.

4. Laboratory exhaust gas purification device according to claim 1, characterized in that the air intake assembly (2) comprises: an air inlet pipe (21), an exhaust fan (22) and an air collecting cover (23); one side of casing (1) is provided with the air inlet, intake pipe (21) pass through the air inlet with installation cavity intercommunication, the inside of intake pipe (21) is inlayed and is equipped with exhaust fan (22), the one end intercommunication that casing (1) was kept away from to intake pipe (21) has gas collecting channel (23).

5. The laboratory exhaust gas purification apparatus according to claim 4, wherein the purification assembly comprises: an air filter screen (5) and an active carbon filter screen (6); the air filter screen (5) is arranged in the mounting cavity and is positioned above the air inlet; the active carbon filter screen (6) is arranged above the air filter screen (5).

6. Laboratory exhaust gas purification device according to claim 5, characterized in that the housing (1) is provided with a cleaning assembly for cleaning the air filter screen (5); the bottom of one side of the shell (1) far away from the air inlet pipe (21) is provided with a pollution discharge assembly (15).

7. The laboratory exhaust gas purification apparatus according to claim 6, wherein the cleaning assembly comprises:

the threaded rod (7) is arranged in the installation cavity along a first direction and is positioned above the air filter screen (5), one end of the threaded rod (7) is rotatably connected with the inner wall of the shell (1), the other end of the threaded rod (7) penetrates through the shell (1) to be connected with a first driving motor (8), and the first driving motor (8) is arranged on the outer wall of the shell (1); a sliding block (10) is connected to the threaded rod (7) in a threaded manner;

the cleaning brush (9) is arranged at the bottom of the sliding block (10), and the cleaning brush (9) is abutted with the air filter screen (5);

the liquid storage tank (11), liquid storage tank (11) is set up in one side of casing (1), the output of liquid storage tank (11) is connected with water pump (12), the other end of water pump (12) is connected with flexible pipe (13), the other end of flexible pipe (13) stretches into in the installation cavity;

the spray head (14), spray head (14) fixed mounting is in on slider (10), spray head (14) with flexible pipe (13) stretches into the one end of installation cavity is connected.

8. Laboratory exhaust gas purification device according to claim 6, characterized in that the blowdown assembly (15) comprises: the novel sewage treatment device comprises a sewage discharge pipe (151) and a sewage discharge valve (152), wherein the sewage discharge pipe (151) is arranged at the bottom of one side, far away from the air inlet pipe (21), of the shell (1), and the sewage discharge valve (152) is arranged on the outer side of the sewage discharge pipe (151).

9. Laboratory exhaust gas purification device according to claim 7, characterized in that a baffle plate (16) is arranged on the inner wall of the housing (1) and at the air inlet in a second direction, a second drive motor is arranged on the outer wall of the housing (1), the drive end of the second drive motor is connected with one side of the baffle plate (16) in the second direction, and the second drive motor is used for driving the baffle plate (16) to rotate around a third direction; the second driving motor has a first state and a second state; when in the first state, the second driving motor drives the baffle plate (16) to approach and shield the air inlet; when in the second state, the second driving motor drives the baffle plate (16) away from the air inlet; the second direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

10. Laboratory exhaust gas purification device according to claim 1, characterized in that the inside top of the housing (1) is fixedly fitted with an ultraviolet germicidal lamp (17).