CN217474386U

CN217474386U - Air supplement type laboratory ventilation cabinet

Info

Publication number: CN217474386U
Application number: CN202221250013.0U
Authority: CN
Inventors: 李爱辉
Original assignee: Anhui Baotu Laboratory Equipment Co ltd
Current assignee: Anhui Baotu Laboratory Equipment Co ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-09-23
Anticipated expiration: 2032-05-23

Abstract

The application discloses an air supplement type laboratory ventilation cabinet, which belongs to the technical field of ventilation cabinets and comprises a cabinet body and an operating room, wherein gas collecting hoods are arranged on the peripheral side walls in the operating room; the lateral wall of first communicating pipe communicates has two second communicating pipes, and two second communicating pipes also wear to locate in the cabinet body, and extend to the control chamber, and two second communicating pipes are linked together with the gas collecting channel on two other week lateral walls of control chamber respectively. This application has a large amount of poisonous, the harmful gas that reduces the experiment and produce and directly passes through from experimenter's face to reduce experimenter and inhale these poisonous, harmful gas's in a large number possibility, and then be favorable to experimenter's healthy effect.

Description

Air supplement type laboratory ventilation cabinet

Technical Field

The application relates to the technical field of fume hoods, in particular to a wind supplementing type laboratory fume hood.

Background

Laboratory ventilation is an indispensable component of laboratory design, and good ventilation is required in the laboratory in order to prevent laboratory workers from inhaling some toxic and harmful chemicals and organisms; and a fume hood, which is one of the most commonly used local air exhaust devices in a laboratory, can prevent pollutants in an experiment from being diffused toward the laboratory.

The fume chamber among the prior art includes the cabinet body, and the internal control chamber that has seted up of cabinet, and the below platform in the control chamber is experimental platform, and the top in the control chamber is equipped with the gas collecting channel, is equipped with the air exhauster on the cabinet body, and the air inlet intercommunication of air exhauster has the breathing pipe, and it is internal that the cabinet is worn to locate by the breathing pipe, and extends to in the control chamber, and the one end that the breathing pipe is located the control chamber communicates in the gas collecting channel.

In view of the above-mentioned related art, when the experimenter performs experiments on the experimental platform, the gas-collecting hood is disposed above the operating room, so that when the exhaust fan works, toxic and harmful gases generated by the experiments may pass through the experimenter from the front door in a large amount, and the experimenter may inhale the toxic and harmful gases or other chemical substances, thereby affecting the physical health of the experimenter.

SUMMERY OF THE UTILITY MODEL

In order to reduce the produced a large amount of poisonous, harmful gas of experiment and directly pass through from experimenter's face door to reduce the experimenter and inhale these poisonous, harmful gas's in a large number possibility, and then be favorable to experimenter's healthy, this application provides a benefit wind type laboratory fume hood.

The application provides a pair of benefit wind type laboratory fume chamber adopts following technical scheme:

a ventilation cabinet for an air supply type laboratory comprises a cabinet body and an operating room, wherein gas collecting hoods are arranged on the peripheral side walls in the operating room, a first communication pipe is communicated with an air inlet of an exhaust fan, the first communication pipe penetrates through the cabinet body and extends into the operating room, and the first communication pipe is communicated with the gas collecting hoods on one peripheral side wall of the operating room; the side wall of the first communicating pipe is communicated with two second communicating pipes, the two second communicating pipes also penetrate through the cabinet body and extend into the operating room, and the two second communicating pipes are respectively communicated with the gas collecting hoods on the other two peripheral side walls of the operating room.

Through adopting above-mentioned technical scheme, when the air exhauster during operation, the gas collecting channel of setting on operation room lateral wall can siphon away some produced poisonous, harmful gas of experimenter in the experimentation to can reduce the face door process of the direct follow experimenter of the produced a large amount of poisonous, harmful gas of experiment, and then reduce the experimenter and inhale these poisonous, harmful gas's possibility in a large number, and then be favorable to the healthy of experimenter.

Preferably, a filter screen is arranged at the air inlet of the air collecting hood, the filter screen is installed on the side wall of the air inlet of the air collecting hood, and a cleaning mechanism for cleaning the filter screen is arranged on the filter screen.

By adopting the technical scheme, the arranged filter screen can reduce the possibility that some indoor dust or some impurities with larger volume enter the exhaust fan so as to damage the motor of the exhaust fan; later when the staff need clean the filter screen, can clean the filter screen through the clean mechanism that sets up on the filter screen to can reduce the degree of difficulty of staff's clean filter screen.

Preferably, the cleaning mechanism comprises a hairbrush, an installation plate and a sliding plate, the hairbrush is fixedly installed on the installation plate, first sliding grooves are formed in the side walls of the two opposite ends of the air inlet of the air collecting hood, guide rods are fixedly connected to the two opposite ends of the sliding plate, and the two guide rods are respectively connected to the inner walls of the two first sliding grooves in a sliding manner; a first storage groove is formed in one side, close to the filter screen, of the sliding plate, a second storage groove is formed in one side, far away from the filter screen, of the sliding plate, and the second storage groove is communicated with the first storage groove; the hairbrush is arranged in the first storage groove and is connected to the side wall of the filter screen in a sliding manner; the mounting panel set up in the second storage tank, be equipped with in the second storage tank and be used for right the mounting panel carries out spacing subassembly.

Through adopting above-mentioned technical scheme, the staff at first places the mounting panel in the second storage tank, and the brush is located first storage tank this moment to contact with the filter screen, the mounting panel can be spacing under the limiting displacement of spacing subassembly afterwards, later the staff can remove the slide, the slide removes and drives mounting panel and brush removal, the brush can clean the filter screen this moment, thereby the staff of can being convenient for cleans dust and impurity on the filter screen.

Preferably, second chutes are formed in side walls of two opposite ends of an air inlet of the gas collecting hood, the two second chutes are respectively communicated with the two first chutes, baffles are arranged in the second chutes, the baffles are fixedly connected to the side walls of the guide rods, and the baffles are slidably connected to inner walls of the second chutes.

Through adopting above-mentioned technical scheme, the baffle that sets up can reduce the guide bar and take place the possibility of separation with the gas collecting channel to can reduce the possibility that slide and gas collecting channel take place the separation.

Preferably, the limiting assembly comprises a limiting block and a first spring, a storage groove is formed in the inner wall of the second storage groove, the limiting block slides in the inner cavity of the storage groove, and an inclined plane is arranged on the limiting block; the one end fixed connection of first spring in the stopper, the other end fixed connection of first spring in the inner wall of hold up tank, seted up the confession on the mounting panel the spacing groove that the stopper was pegged graft.

Through adopting above-mentioned technical scheme, when the staff removed the mounting panel to the direction that is close to the filter screen and pegged graft to the second storage tank in, the mounting panel can promote the stopper through the inclined plane on the stopper and overcome the elasticity of first spring and remove at the in-process of pegging graft, when the mounting panel removed the position that the spacing groove on stopper and the mounting panel corresponds afterwards, the elasticity of first spring can promote the stopper and remove to peg graft the spacing inslot this moment to can reduce the possibility that mounting panel and slide take place to separate.

Preferably, a second spring and a abutting block are arranged on the inner wall of one side, close to the filter screen, of the second storage groove, one end of the second spring is fixedly connected to the abutting block, the other end of the second spring is fixedly connected to the inner wall of the second storage groove, and the abutting block is in abutting fit with the mounting plate.

Through adopting above-mentioned technical scheme, the in-process that mounting panel and second storage tank pegged graft mutually can promote to support the elasticity that tight piece overcome the second spring and remove, when the stopper was pegged graft to the spacing inslot afterwards, the elasticity of second spring can promote to support tight piece and support tight mounting panel this moment to can reduce the intensity that the mounting panel takes place to rock.

Preferably, be equipped with first cooperation piece, second cooperation piece and actuating lever in the holding vessel, first cooperation piece fixed connection in the stopper, second cooperation piece fixed connection in the actuating lever, the actuating lever is kept away from wear to establish and sliding connection in the one end of filter screen is in the holding vessel is kept away from the one end inner wall of filter screen, be equipped with the inclined plane on the second cooperation piece, just first cooperation piece butt cooperation in second cooperation piece.

Through adopting the above technical scheme, when the staff need dismantle the washing to the brush, the staff at first removes the actuating lever to the direction that is close to the filter screen, the actuating lever removes and drives the removal of second cooperation piece, the removal of second cooperation piece can promote first cooperation piece to the direction removal of keeping away from the mounting panel through the inclined plane, the removal of first cooperation piece drives spacing piece and removes, after that when spacing piece removes the position to keeping away from the mounting panel, spacing is relieved to the mounting panel this moment, thereby the staff can dismantle mounting panel and brush, and then can be convenient for the staff and wash the brush.

Preferably, a third spring is arranged in the storage tank, one end of the third spring is fixedly connected to the second matching block, and the other end of the third spring is fixedly connected to the inner wall of the end, far away from the filter screen, of the storage tank.

Through adopting above-mentioned technical scheme, at the staff to the in-process that is close to the direction removal actuating lever of filter screen, the third spring is stretched, later when the mounting panel was dismantled, staff release actuating lever this moment, and the actuating lever can reset under the elasticity pulling of third spring.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the exhaust fan works, the gas-collecting hoods arranged on the peripheral side walls of the operating room can suck some toxic and harmful gases generated by an experimenter in the experimental process, so that a large amount of toxic and harmful gases generated by the experiment can be reduced to directly pass through the experimenter, the possibility that the experimenter sucks a large amount of toxic and harmful gases is further reduced, and the physical health of the experimenter is facilitated;

2. the filter screen can reduce the possibility that some dust or some impurities with larger volume in a room enter the air extractor, so that the motor of the air extractor is damaged; when workers need to clean the filter screen, the filter screen can be cleaned through a cleaning mechanism arranged on the filter screen, so that the difficulty of the workers in cleaning the filter screen can be reduced;

3. the staff at first places the mounting panel in the second storage tank, and the brush is located first storage tank this moment to contact with the filter screen, the mounting panel can be spacing under the limiting displacement of spacing subassembly afterwards, later the staff can remove the slide, the slide removes and drives mounting panel and brush removal, and the brush can clean the filter screen this moment, thereby the staff of can being convenient for cleans dust and impurity on the filter screen.

Drawings

FIG. 1 is a schematic diagram of a prior art configuration;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 3 is a schematic view of the filter screen in the embodiment of the present application;

fig. 4 is a schematic structural diagram of a highlight mounting plate in the embodiment of the present application.

Fig. 5 is an enlarged view at a in fig. 4.

Description of reference numerals:

1. a cabinet body; 2. an operating room; 21. an experimental platform; 3. a gas-collecting hood; 31. an exhaust fan; 32. an air intake duct; 33. a first communication pipe; 34. a second communicating pipe; 4. a filter screen; 41. a cleaning mechanism; 411. a brush; 412. mounting a plate; 413. a slide plate; 414. a first chute; 415. a first storage tank; 416. a second storage tank; 417. a guide bar; 42. a limiting component; 421. a limiting block; 422. a first spring; 423. a storage tank; 424. a bevel; 425. a limiting groove; 43. a second chute; 431. a baffle plate; 5. a second spring; 51. a propping block; 6. a first mating block; 61. a second mating block; 62. a drive rod; 7. and a third spring.

Detailed Description

The present application is described in further detail below with reference to figures 2-5.

The embodiment of the application discloses air supplement type laboratory fume chamber. As shown in fig. 2 and 3, the cabinet comprises a cabinet body 1 and an operating room 2, gas collecting hoods 3 are arranged on three peripheral side walls in the operating room 2, an air inlet of an exhaust fan 31 is communicated with a first communicating pipe 33, the first communicating pipe 33 penetrates through the cabinet body 1 from the back side of the cabinet body 1 and extends into the operating room 2, and the first communicating pipe 33 is communicated with the gas collecting hoods 3 on the peripheral side walls on the back side of the operating room 2; the side walls of the first communicating pipe 33 are communicated with two second communicating pipes 34, the two second communicating pipes 34 are also arranged in the cabinet body 1 in a penetrating manner and extend into the operating room 2, and the two second communicating pipes 34 are respectively communicated with the gas collecting hoods 3 on the left and right side walls of the operating room 2; when air exhauster 31 during operation, set up the gas collecting channel 3 on operation room 2 week lateral wall and can siphon away some poisonous, harmful gas that the experimenter produced in the experimentation to can reduce the produced a large amount of poisonous, harmful gas of experiment and directly pass through from the experimenter's face, and then reduce the experimenter and inhale the possibility of these poisonous, harmful gas in a large number, and then be favorable to the experimenter's is healthy.

As shown in fig. 2 and 3, a filter screen 4 is arranged at the air inlet of the gas collecting hood 3, the filter screen 4 is welded on the inner wall of the air inlet of the gas collecting hood 3, and a cleaning mechanism 41 for cleaning the filter screen 4 is arranged on the filter screen 4; the filter screen 4 can reduce the possibility that some dust or some impurities with larger volume in the room enter the exhaust fan 31, thereby damaging the motor of the exhaust fan 31; when the filter screen 4 needs to be cleaned by the worker, the filter screen 4 can be cleaned by the cleaning mechanism 41 arranged on the filter screen 4, so that the difficulty of cleaning the filter screen 4 by the worker can be reduced.

As shown in fig. 3 and 4, the cleaning mechanism 41 includes a brush 411, a mounting plate 412, and a slider 413.

As shown in fig. 4 and 5, the mounting plate 412 is rectangular, the brush 411 is fixedly mounted on one side of the mounting plate 412 close to the filter screen 4, the side walls of two opposite ends of the air inlet of the gas collecting channel 3 are both provided with first sliding grooves 414, and the first sliding grooves 414 extend along the length direction of the air inlet of the gas collecting channel 3; the side walls of the bottoms of the two opposite ends of the sliding plate 413 are fixedly connected with guide rods 417, the guide rods 417 are rectangular, and the two guide rods 417 are respectively connected to the inner walls of the two first sliding grooves 414 in a sliding manner along the length direction of the air inlet of the air collecting hood 3; a first storage groove 415 is formed in one side, close to the filter screen 4, of the sliding plate 413, the first storage groove 415 extends along the length direction of the sliding plate 413, a second storage groove 416 is formed in one side, far away from the filter screen 4, of the sliding plate 413, the second storage groove 416 extends along the length direction of the sliding plate 413, and the second storage groove 416 is communicated with the first storage groove 415; the brush 411 is arranged in the first storage groove 415, and the brush 411 is connected to the side wall of the filter screen 4 in a sliding manner along the length direction of the air inlet of the air collecting hood 3; the mounting plate 412 is disposed in the second storage slot 416, and the limiting assembly 42 for limiting the mounting plate 412 is disposed in the second storage slot 416.

As shown in fig. 4 and 5, the worker firstly places the mounting plate 412 in the second storage slot 416, at this time, the brush 411 is located in the first storage slot 415 and contacts with the filter screen 4, then the mounting plate 412 can be limited under the limiting effect of the limiting component 42, the worker can move the sliding plate 413, the sliding plate 413 moves to drive the mounting plate 412 and the brush 411 to move, at this time, the brush 411 can clean the filter screen 4, and therefore the worker can clean dust and impurities on the filter screen 4 conveniently.

As shown in fig. 4 and 5, the side walls of two opposite ends of the air inlet of the gas collecting channel 3 are both provided with second sliding grooves 43, the second sliding grooves 43 extend along the length direction of the air inlet of the gas collecting channel 3, and the two second sliding grooves 43 are respectively communicated with the two first sliding grooves 414; a baffle 431 is arranged in the second sliding chute 43, the baffle 431 is in a cuboid shape, the baffle 431 is fixedly connected to the side wall of the bottom of the guide rod 417, and the baffle 431 is connected to the inner wall of the second sliding chute 43 in a sliding manner along the length direction of the air inlet of the air collecting hood 3; the baffle 431 is provided to reduce the possibility of separation of the guide bar 417 from the gas collecting channel 3, and thus to reduce the possibility of separation of the sliding plate 413 from the gas collecting channel 3.

As shown in fig. 4 and fig. 5, the limiting component 42 includes a limiting block 421 and a first spring 422, the inner walls of the left and right ends of the second storage tank 416 are both provided with a storage tank 423, the limiting block 421 slides in the inner cavity of the storage tank 423 along the length direction of the sliding plate 413, and one end of the limiting block 421 close to the mounting plate 412 is provided with an inclined surface 424; the first spring 422 is arranged along the length direction of the sliding plate 413, one end of the first spring 422 is fixedly connected to the limiting block 421, the other end of the first spring 422 is fixedly connected to the inner wall of the end, far away from the mounting plate 412, of the storage groove 423, and limiting grooves 425 for the limiting block 421 to be inserted are formed in the left end and the right end of the mounting plate 412; when the worker moves the mounting plate 412 towards the direction close to the filter screen 4 to be inserted into the second storage groove 416, the mounting plate 412 can push the limiting block 421 to move against the elastic force of the first spring 422 through the inclined surface 424 on the limiting block 421 in the inserting process, and then when the mounting plate 412 moves to the position where the limiting block 421 corresponds to the limiting groove 425 on the mounting plate 412, the elastic force of the first spring 422 can push the limiting block 421 to move to be inserted into the limiting groove 425, so that the possibility that the mounting plate 412 is separated from the sliding plate 413 can be reduced.

As shown in fig. 4 and 5, the second storage slot 416 is provided with a second spring 5 and a abutting block 51 at both left and right ends of an inner wall of one side close to the filter screen 4, the second spring 5 is arranged along the height direction of the sliding plate 413, the top end of the second spring 5 is fixedly connected to the abutting block 51, the bottom end of the second spring 5 is fixedly connected to the inner wall of the bottom of the second storage slot 416, and the abutting block 51 is in abutting fit with the side wall of the bottom of the mounting plate 412; in the process that the mounting plate 412 and the second storage groove 416 are plugged together, the abutting block 51 can be pushed to overcome the elastic force of the second spring 5 to move, and then when the limiting block 421 is plugged into the limiting groove 425, the elastic force of the second spring 5 can push the abutting block 51 to abut against the mounting plate 412, so that the strength of shaking of the mounting plate 412 can be reduced.

As shown in fig. 4 and 5, a first engaging block 6, a second engaging block 61 and a driving rod 62 are disposed in the storage groove 423, the first engaging block 6 is rectangular, and the first engaging block 6 is fixedly connected to the limiting block 421; the second matching block 61 is rectangular, the driving rod 62 is cylindrical and is arranged along the height direction of the sliding plate 413, the second matching block 61 is fixedly connected to the bottom side wall of the driving rod 62, the top end of the driving rod 62 penetrates through and is slidably connected to the top inner wall of the storage tank 423 along the height direction of the sliding plate 413, an inclined surface 424 is arranged at one side, close to the first matching block 6, of the bottom end of the second matching block 61, and the first matching block 6 is in butt fit with the second matching block 61; when the staff need dismantle the washing to brush 411, the staff at first removes actuating lever 62 to the direction that is close to filter screen 4, actuating lever 62 removes and drives second cooperation piece 61 and removes, second cooperation piece 61 removes and can promote first cooperation piece 6 to the direction of keeping away from mounting panel 412 through inclined plane 424 and remove, first cooperation piece 6 removes and drives stopper 421 and removes, when stopper 421 remove to the position of keeping away from mounting panel 412 afterwards, mounting panel 412 is relieved spacingly this moment, thereby the staff can dismantle mounting panel 412 and brush 411, and then can be convenient for the staff to wash brush 411.

As shown in fig. 4 and 5, a third spring 7 is arranged in the storage groove 423, the third spring 7 is arranged along the height direction of the sliding plate 413, the third spring 7 is sleeved on the driving rod 62, the bottom end of the third spring 7 is fixedly connected to the second matching block 61, and the top end of the third spring 7 is fixedly connected to the top inner wall of the storage groove 423; during the process that the operator moves the driving rod 62 to the direction close to the filter screen 4, the third spring 7 is stretched, and then when the mounting plate 412 is detached, the operator releases the driving rod 62, and the driving rod 62 can be reset under the pulling of the elastic force of the third spring 7.

The implementation principle of the embodiment of the application is as follows: when air exhauster 31 during operation, set up some poisonous, harmful gas that the experimenter produced in the experimentation can be siphoned away to gas collecting channel 3 on 2 week lateral walls in control chamber to can reduce the direct face door process of experimenter of the produced a large amount of poisonous, harmful gas of experiment, and then reduce the experimenter and inhale the possibility of these poisonous, harmful gas in a large number, and then be favorable to experimenter's healthy.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a mend wind type laboratory fume chamber, includes the cabinet body (1) and control chamber (2), its characterized in that: the gas collecting hoods (3) are arranged on the peripheral side walls in the operating room (2), a first communicating pipe (33) is communicated with an air inlet of the exhaust fan (31), the first communicating pipe (33) penetrates through the cabinet body (1) and extends into the operating room (2), and the first communicating pipe (33) is communicated with the gas collecting hoods (3) on one peripheral side wall of the operating room (2); the side wall of the first communicating pipe (33) is communicated with two second communicating pipes (34), the two second communicating pipes (34) are also arranged in the cabinet body (1) in a penetrating mode and extend into the operation chamber (2), and the two second communicating pipes (34) are respectively communicated with the gas collecting hoods (3) on the other two peripheral side walls of the operation chamber (2).

2. A laboratory ventilated case of the air supplement type according to claim 1, wherein: the air inlet of gas collecting channel (3) department is equipped with filter screen (4), filter screen (4) install in the lateral wall of the air inlet department of gas collecting channel (3), it is right to be equipped with on filter screen (4) be used for filter screen (4) carry out clear clean mechanism (41).

3. A laboratory ventilated case of the air supplement type according to claim 2, wherein: the cleaning mechanism (41) comprises a hairbrush (411), a mounting plate (412) and a sliding plate (413), the hairbrush (411) is fixedly mounted on the mounting plate (412), the side walls of the two opposite ends of the air inlet of the air collecting hood (3) are respectively provided with a first sliding chute (414), the two opposite ends of the sliding plate (413) are respectively and fixedly connected with guide rods (417), and the two guide rods (417) are respectively and slidably connected with the inner walls of the two first sliding chutes (414); a first storage groove (415) is formed in one side, close to the filter screen (4), of the sliding plate (413), a second storage groove (416) is formed in one side, far away from the filter screen (4), of the sliding plate (413), and the second storage groove (416) is communicated with the first storage groove (415); the brush (411) is arranged in the first storage groove (415), and the brush (411) is connected to the side wall of the filter screen (4) in a sliding manner; the mounting plate (412) is arranged in the second storage groove (416), and a limiting assembly (42) used for limiting the mounting plate (412) is arranged in the second storage groove (416).

4. A laboratory ventilated case of the air supplement type according to claim 3, wherein: second spout (43) have all been seted up to the relative both ends lateral wall at the air inlet department of gas collecting channel (3), two second spout (43) respectively with two first spout (414) are linked together, be equipped with baffle (431) in second spout (43), baffle (431) fixed connection in the lateral wall of guide bar (417), baffle (431) sliding connection in the inner wall of second spout (43).

5. A laboratory ventilated case of the air supplement type according to claim 3, wherein: the limiting assembly (42) comprises a limiting block (421) and a first spring (422), a storage groove (423) is formed in the inner wall of the second storage groove (416), the limiting block (421) slides in the inner cavity of the storage groove (423), and an inclined surface (424) is arranged on the limiting block (421); one end of the first spring (422) is fixedly connected to the limiting block (421), the other end of the first spring (422) is fixedly connected to the inner wall of the storage groove (423), and the mounting plate (412) is provided with a limiting groove (425) for the limiting block (421) to be inserted.

6. A laboratory ventilated case of the air supplement type according to claim 3, wherein: the second storage tank (416) is close to one side inner wall of filter screen (4) is equipped with second spring (5) and supports tight piece (51), the one end fixed connection of second spring (5) in support tight piece (51), the other end fixed connection of second spring (5) in the inner wall of second storage tank (416), support tight piece (51) butt cooperation in mounting panel (412).

7. The ventilated type laboratory hood according to claim 5, wherein: be equipped with first cooperation piece (6), second cooperation piece (61) and actuating lever (62) in holding vessel (423), first cooperation piece (6) fixed connection in stopper (421), second cooperation piece (61) fixed connection in actuating lever (62), keep away from actuating lever (62) the one end of filter screen (4) is worn to establish and sliding connection in holding vessel (423) is kept away from the one end inner wall of filter screen (4), be equipped with inclined plane (424) on second cooperation piece (61), just first cooperation piece (6) butt cooperation in second cooperation piece (61).

8. A laboratory ventilated case of the air supplement type according to claim 7, wherein: a third spring (7) is arranged in the storage groove (423), one end of the third spring (7) is fixedly connected to the second matching block (61), and the other end of the third spring (7) is fixedly connected to the inner wall of one end, far away from the filter screen (4), of the storage groove (423).