CN217222882U - No counter weight fume chamber with quick overhead door - Google Patents

Abstract

The utility model belongs to the technical field of the fume chamber and specifically relates to a no counter weight fume chamber with quick overhead door is related to, and it includes the cabinet body, cabinet body upper portion is provided with ventilation unit, cabinet body lower part is provided with the storeroom, the working chamber with external portion of cabinet intercommunication is seted up at cabinet body middle part, the opening part slip of working chamber is provided with the cabinet door, be provided with the controlling means that the control cabinet door was opened on the cabinet body, controlling means is including rotating lead screw and the drive screw pivoted drive assembly of connection on the cabinet body, cabinet door and lead screw thread fit. This application has the effect that improves cabinet door opening speed.

Description

No counter weight fume chamber with quick overhead door

Technical Field

The application relates to the field of fume hoods, in particular to a counterweight-free fume hood with a quick lifting door.

Background

The fume hood is a common local exhaust device in a laboratory, can completely and timely discharge various harmful gases and smoke generated in the experimental process out of a workplace, can prevent an operator from sucking toxic, harmful and peculiar smell gases, and plays a good role in protecting the operator.

Be provided with the operation area on the fume chamber usually, the fan on fume chamber top is discharged harmful gas, and during operating personnel carried out the experiment operation, the positive fume chamber door of fume chamber often need adjust a suitable height, neither hinders the experimenter to observe like this, operate, can protect experimenter's face and upper portion region again.

Be provided with the balancing weight with door connection in the current fume chamber, when opening the cabinet door, generally adopt the manual mode of opening the fume chamber door of push-and-pull from top to bottom of simple, adopt the mode of manual push-and-pull fume chamber door when using, often grip laboratory glassware or equipment in the operator's hand, be difficult to in time push-and-pull window form reach the purpose of shielding or sealing the experimental space, consequently the harmful gas or the splash that produce can bring huge potential safety hazard for the operator in the experiment.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: make the staff open the cabinet door through the balancing weight that sets up, the opening speed of cabinet door is slower, can not be timely open the cabinet door to suitable position.

SUMMERY OF THE UTILITY MODEL

In order to improve the opening speed of cabinet door, this application provides a no counter weight fume chamber with quick lift door.

The application provides a pair of no counter weight fume chamber with quick overhead door adopts following technical scheme:

the utility model provides a no counter weight fume chamber with quick overhead door, includes the cabinet body, cabinet body upper portion is provided with ventilation unit, cabinet body lower part is provided with the storeroom, cabinet body middle part set up with the working chamber of external intercommunication of cabinet, the opening part slip of working chamber is provided with the cabinet door, be provided with the controlling means that the control cabinet door was opened on the cabinet body, controlling means is including rotating lead screw and the drive screw pivoted drive assembly of connection on the cabinet body, cabinet door and lead screw thread fit.

Through adopting above-mentioned technical scheme, this application embodiment is through the form that adopts electronic or other mechanical power, and when opening the cabinet door, the opening rate of cabinet door is faster, and response time is shorter to the size of opening is also more accurate, makes the cabinet door open the height that needs fast.

Optionally, the screw rods are provided with a pair of screw rods, the two screw rods are symmetrically arranged at two ends of the cabinet door, the cabinet door is in threaded fit with the two screw rods, and the driving assembly drives the two screw rods to synchronously rotate.

Through adopting above-mentioned technical scheme, the pair of lead screw of setting, when opening the cabinet door, more smooth and easy that the cabinet door was opened avoids single lead screw to open when the cabinet door, and the cabinet door receives the effect of gravity, makes the both sides of cabinet door upwards slide simultaneously, and consequently, the in-process of opening the cabinet door is guaranteed to the pair of lead screw of setting, and the gliding more steady of cabinet door.

Optionally, the cabinet door is composed of an upper cabinet door and a lower cabinet door, the upper cabinet door and the lower cabinet door are in sliding fit with the opening of the working cavity, the lower cabinet door and the upper cabinet door are arranged in a staggered mode from front to back, the lower cabinet door is in threaded fit with the two lead screws, and a supporting plate extending towards the inside of the working cavity is arranged on one side, away from the upper cabinet door, of the lower cabinet door.

By adopting the technical scheme, the upper cabinet door and the lower cabinet door are independently arranged, so that the problem that the whole cabinet door is too heavy and inconvenient for workers to open is avoided, the weight of the cabinet door is reduced due to the split cabinet doors, and only the lower cabinet door needs to be opened in a test; when needs are maintained the washing of working chamber inside, go up the cabinet door and upwards open simultaneously with lower cabinet door to make things convenient for the staff to wash, the layer board that sets up can lift the cabinet door and open gradually.

Optionally, a pair of first sliding grooves and a pair of second sliding grooves are formed in the inner wall, close to the opening of the working cavity, of the cabinet body, two ends of the lower cabinet door are arranged in the first sliding grooves, two ends of the upper cabinet door are arranged in the second sliding grooves, and the length of the second sliding grooves is smaller than that of the first sliding grooves.

Through adopting above-mentioned technical scheme, the first spout that sets up can make down the cabinet door slide to the upside from the downside of working chamber opening part to control the working chamber open-ended and open the size, the second spout of setting makes the cabinet door can only open certain opening, thereby guarantees that the cabinet door can be gradually opened.

Optionally, first spout and the inside sealed pad that is the U-shaped that all is provided with of second spout, the symmetry is provided with the sealing strip on the inner wall of sealed pad opening part, it sets up elastic sealing strip to go up between the downside of cabinet door and the upside of lower cabinet door.

Through adopting above-mentioned technical scheme, the inside leakproofness of working chamber has fully been guaranteed to sealed pad, sealing strip and the gasket that sets up, prevents in the test process that harmful gas that chemical reagent produced from the inside of working chamber overflows.

Optionally, one side of the lower cabinet door, which is far away from the upper cabinet door, is provided with an edge covering strip in a C shape, and a rubber pad is arranged on the surface of the edge covering strip, which is far away from the lower cabinet door.

Through adopting above-mentioned technical scheme, the bound strake of setting can avoid taking place rigid collision down between cabinet door and the desktop to the rubber pad of setting can play the effect of buffering.

Optionally, the cabinet body is fixedly connected with a supporting block on the outer surface of the lower side of the opening of the working cavity, and the supporting block is of an internal hollow structure.

Through adopting above-mentioned technical scheme, the supporting shoe that sets up can play the effect of protection on the one hand to drive assembly, and on the other hand, during the experiment, staff's elbow can be placed at the supporting shoe upper surface, plays the effect of support, also supplies staff to put loose hand elbow.

Optionally, a protective cover covering the two lead screws is fixed on the cabinet body.

Through adopting above-mentioned technical scheme, the protection casing that sets up can play the effect of protection to the lead screw, also avoids the lead screw when rotating, staff's mistake touches.

Optionally, a pressure sensor is arranged on the cabinet door, and the pressure sensor is matched with the control device; the cabinet body is provided with a concentration detector on the inner surface of the working cavity, and the concentration detector is matched with the ventilation device.

By adopting the technical scheme, when more than two workers perform experiments in the fume hood, after one worker completes the experiments and mistakenly touches the closing switch of the door of the fume hood, the pressure sensor can control the driving assembly in time after detecting a pressure signal, so that the door of the fume hood is prevented from being further closed; when the concentration sensor detects that the concentration of harmful gas in the working cavity exceeds the standard, a transmission signal is sent to the controller, then the controller controls the ventilation device to be opened, so that the harmful gas can be timely discharged, and the influence on workers is avoided.

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

1. according to the embodiment of the application, by adopting an electric or mechanical power mode, when the cabinet door is opened, the opening speed of the cabinet door is higher, the response time is shorter, and the opening size is more accurate, so that the cabinet door can be quickly opened to a required height, and the cabinet door can slide more stably in the opening process through the matching of the driving assembly and the screw rod;

2. the upper cabinet door and the lower cabinet door which are arranged independently avoid the situation that the whole cabinet door is too heavy and inconvenient to open for workers, and the cabinet doors which are arranged in a split manner reduce the weight of the cabinet door, so that only the lower cabinet door needs to be opened in a test; when the inside washing of working chamber is maintained to needs, go up cabinet door and lower cabinet door and upwards open simultaneously to make things convenient for the staff to wash.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of the present application embodying a first runner and a second runner;

FIG. 3 is a schematic view of the present application embodying a pallet;

FIG. 4 is a schematic diagram of a control device embodied in an embodiment of the present application;

fig. 5 is a schematic diagram of two performance control devices according to an embodiment of the present application.

Description of reference numerals: 1. a cabinet body; 2. a ventilation device; 3. a working chamber; 4. the upper cabinet door is arranged; 5. a lower cabinet door; 6. a first chute; 7. a second chute; 8. a gasket; 9. a seal strip; 10. sealing the sheet; 11. a groove; 12. an air curtain machine; 13. a support plate; 14. a lead screw; 15. a drive assembly; 16. a synchronizing wheel; 17. a synchronous belt; 18. a let position port; 19. connecting blocks; 20. a protective cover; 21. a supporting block; 25. an infrared sensor; 26. a concentration detector; 27. and (6) edge wrapping strips.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses no counter weight fume chamber with quick overhead door.

Example 1

Referring to fig. 1, a no counter weight fume chamber with quick overhead door includes vertical setting at subaerial cabinet body 1, be provided with ventilation unit 2 at cabinet body 1 upper surface, be provided with the storeroom in cabinet body 1 below, the storeroom that sets up is used for storing used chemical supply when experimental, working chamber 3 has been seted up on cabinet body 1 between ventilation unit 2 and storeroom, working chamber 3 and the external intercommunication of cabinet body 1, ventilation unit 2 and the inside intercommunication of working chamber 3, in the time of the experiment, working chamber 3 supplies the staff to use, the harmful gas of production passes through ventilation unit 2 and carries the workshop to handle.

A cabinet door is vertically and slidably arranged at the opening of the working chamber 3, the cabinet door is composed of an upper cabinet door 4 and a lower cabinet door 5, the upper cabinet door 4 and the lower cabinet door 5 are made of toughened glass materials, when the cabinet door is in a closed state, the upper cabinet door 4 and the lower cabinet door 5 can be mutually matched and arranged at the opening of the working chamber 3, so that a closed environment is formed inside the working chamber 3, the upper cabinet door 4 and the lower cabinet door 5 are arranged in a vertically staggered manner, the upper cabinet door 4 is positioned at the upper side of the opening of the working chamber 3, the lower cabinet door 5 is positioned at the lower side of the opening of the working chamber 3, the upper cabinet door 4 is positioned at the inner side of the lower cabinet door 5, when the lower cabinet door 5 is opened, the lower cabinet door 5 is gradually opened upwards to drive the upper cabinet door 4 to be opened after the lower cabinet door 5 is opened, the upper cabinet door 4 and the lower cabinet door 5 are arranged in two parts, so that a proper opening can be opened according to the requirements of a worker test, the problem that harmful gas diffuses indoors in the test process due to the fact that the opening is too large is avoided, the upper cabinet door 4 and the lower cabinet door 5 are independently arranged, the problem that the whole cabinet door is too heavy and inconvenient to open by workers is avoided, the weight of the cabinet door is reduced due to the fact that the cabinet doors are arranged in a split mode, and the lower cabinet door 5 is only required to be opened in the test process; when the inside of the working chamber 3 needs to be cleaned and maintained, the upper cabinet door 4 and the lower cabinet door 5 are opened upwards at the same time, so that the cleaning of workers is facilitated.

Referring to fig. 1 and 2, the cabinet body 1 internal surface of the inside both sides of working chamber 3 is provided with the first spout 6 and the second spout 7 that supply cabinet door 5 to slide and go up cabinet door 4 gliding on the symmetry, the both ends of cabinet door 5 slide and set up inside first spout 6 down, the both ends of going up cabinet door 4 slide and set up inside second spout 7, the length direction of first spout 6 and the length direction of second spout 7 are the same with the direction of height of 3 openings of working chamber, because the sliding distance of cabinet door 5 is greater than the sliding distance of last cabinet door 4 down, consequently, the length of first spout 6 is greater than the length of second spout 7.

Furthermore, the U-shaped sealing gaskets 8 are arranged inside the first sliding chute 6 and the second sliding chute 7, two ends of the upper cabinet door 4 and two ends of the lower cabinet door 5 can be inserted into the U-shaped sealing gaskets 8, and when in test or cabinet door closing, the arranged sealing gaskets 8 can avoid the overflow of harmful gas, so that the sealing property inside the working chamber 3 is ensured, and the harmful gas is discharged from the ventilation device 2; a pair of sealing strips 9 are symmetrically and fixedly connected to the inner surface of the U-shaped opening of the sealing gasket 8, the length direction of the sealing strips 9 is the same as that of the sealing gasket 8, and the arranged sealing strips 9 can be abutted to the surface of the upper cabinet door 4 or the lower cabinet door 5 to further play a role in sealing; the sealing piece 10 is fixedly connected to the upper surface of the lower cabinet door 5, the length direction of the sealing piece 10 is the same as that of the lower cabinet door 5, the sealing piece 10 has elasticity, one side of the sealing piece 10 is fixed to the upper surface of the lower cabinet door 5, the other side of the sealing piece 10 abuts against the upper cabinet door 4, the sealing piece 10 can always abut against the surface of the upper cabinet door 4 when the lower cabinet door 5 vertically slides, the sealing piece 10 can guarantee the sealing performance between the upper cabinet door 4 and the lower cabinet door 5, and harmful gas is prevented from overflowing from a gap between the upper cabinet door 4 and the lower cabinet door 5; seted up recess 11 on the inside lower surface of working chamber 3, the length direction of recess 11 is the same with the length direction of lower cabinet door 5, and when lower cabinet door 5 closed, the inside leakproofness of working chamber 3 is guaranteed in recess 11 can be inserted to the downside of lower cabinet door 5, prevents that the harmful gas that chemical reagent produced from spilling over to indoor from lower cabinet door 5 downside.

Referring to fig. 1 and fig. 3, the parcel has bound strake 27 on lower cabinet door 5's lower limb, bound strake 27's length direction is the same with lower cabinet door 5's length direction, bound strake 27 is C shape, make bound strake 27 can the chucking to lower cabinet door 5 on, and the fixedly connected with rubber pad on the surface that deviates from lower cabinet door 5 at bound strake 27, the bound strake 27 of setting can prevent to take place rigid collision between lower cabinet door 5 lower limb and the desktop, cause cracked of lower cabinet door 5, and the rubber pad of setting can play the effect of shock attenuation buffering.

Keep away from the downside of last cabinet door 4 and towards cabinet body 1 outside fixedly connected with air curtain machine 12 on the surface at lower cabinet door 5, the length direction of air curtain machine 12 is the same with the length direction of lower cabinet door 5 to the wind gap of air curtain machine 12 sets up down, and in the test process, air curtain machine 12 is opened, and the downwind that lasts, can prevent the harmful gas that chemical reagent produced from the opening part outdiffusion of working chamber 3, has played the barrier effect.

Referring to fig. 1 and 3, at lower cabinet door 5 towards the inside layer board 13 of rectangular shape of fixedly connected with on the surface of working chamber 3, layer board 13 is located the downside of lower cabinet door 5 to the length direction of layer board 13 is the same with the length direction of lower cabinet door 5, when the opening of working chamber 3 needs all to be opened, lower cabinet door 5 upwards slides earlier, makes layer board 13 can support the downside of last cabinet door 4, then lifts last cabinet door 4 again and continues upwards to slide, until the cabinet door is all opened.

Referring to fig. 1 and 4, a pair of control devices are symmetrically arranged on the cabinet body 1 at two sides of the opening of the working chamber 3, the control devices can control the lower cabinet door 5 to slide upwards, each control device comprises a pair of lead screws 14 and a driving assembly 15 for driving the lead screws 14 to rotate, and the driving assemblies are servo motors; the length directions of the two lead screws 14 are the same as the sliding direction of the lower cabinet door 5, the upper end and the lower end of each lead screw 14 are rotatably connected with the cabinet body 1, the servo motors are fixed on the cabinet body 1, the lower ends of the two lead screws 14 are respectively provided with the servo motors, and the output shafts of the servo motors are fixed with the lower ends of the lead screws 14; a pair of strip-shaped abdicating openings 18 are symmetrically formed in the outer surface, located at the opening of the working cavity 3, of the cabinet body 1, the length direction of the abdicating openings 18 is the same as that of the lead screws 14, connecting blocks 19 are fixed on the outer surface of the lower cabinet door 5 and at positions close to the two ends, the connecting blocks 19 extend out of the abdicating openings 18, the lead screws 14 correspondingly penetrate through the connecting blocks 19, the lead screws 14 are in threaded fit with the connecting blocks 19, when the lower cabinet door 5 needs to be opened, the two servo motors are started simultaneously, the two lead screws 14 rotate simultaneously, the lower cabinet door 5 is controlled to move upwards gradually, and after the supporting plate 13 abuts against the upper cabinet door 4, the upper cabinet door 4 is driven to move upwards together until all openings of the working cavity 3 are opened; in the test process, a worker can open the cabinet door more quickly by the matching of the arranged servo motor and the lead screw 14, and the servo motor has the characteristic of accuracy in working, can open the cabinet door to a proper height and is suitable for more tests; in addition, the servo motor is matched with the lead screw 14 for use, so that the opening and closing time of the cabinet door is less than or equal to three seconds in the process of lifting or descending the cabinet door by 85cm, and the opening speed of the cabinet door is higher.

A pair of protective covers 20 are symmetrically fixed on the outer side of the cabinet body 1, the protective covers 20 can cover the screw 14, the arranged protective covers 20 can protect the screw 14, and the error touch of workers when the screw 14 rotates is avoided; at the supporting shoe 21 that the cabinet body 1 is located the outside extension of fixedly connected with level on the surface of 3 opening downside in working chamber, supporting shoe 21 is inside hollow structure, the lower extreme of lead screw 14 can be located inside supporting shoe 21, and the upper surface of supporting shoe 21 flushes with the lower surface of working chamber 3, servo motor can be held on the one hand to the supporting shoe 21 of setting, also avoid in the test process, servo motor is directly touched to the staff, on the other hand, during the experiment, staff's elbow can be placed at supporting shoe 21 upper surface, play the effect of support, also supply the staff to put loose hand elbow.

Symmetrical fixedly connected with a pair of infrared sensor 25 on the surface that two protection casings 20 are relative, infrared sensor 25 uses with drive assembly 15 cooperation, be provided with the controller of transmission signal between infrared sensor 25 and the drive assembly 15, when the staff forgets to close the cabinet door after the experiment finishes, infrared sensor 25 detects the signal, then give the controller with the signal transmission that infrared sensor 25 detected, start through controller in time control drive assembly 15 to make the cabinet door in time close.

Install pressure sensor at the lower side of lower cabinet door 5, pressure sensor uses with the servo motor cooperation, be provided with the controller of transmission signal between pressure sensor and the servo motor, when the staff more than two was experimented in the fume chamber, wherein alone accomplish the experiment and the mistake touches behind the cabinet door closing switch, lower cabinet door 5 is behind the staff of overwhelming, pressure sensor can in time detect pressure signal, then give the controller with the signal transmission, thereby make controller control servo motor in time stop, avoid the further closing of cabinet door, and press the staff.

Referring to fig. 1 and 2, install concentration detector 26 on the inside surface of working chamber 3, concentration detector 26 uses with ventilation unit 2 cooperation, is provided with the controller of transmission signal between concentration sensor and the ventilation unit 2, and when concentration sensor detects that the inside harmful gas concentration of working chamber 3 exceeds standard, transmission signal gives the controller, and then opening of controller control ventilation unit 2 can avoid influencing the staff with timely discharge of harmful gas.

Example 2

Referring to fig. 5, the embodiment is different from embodiment 1 in that the number of the servo motors is one, the servo motors are fixed on the cabinet body 1, an output shaft of each servo motor is fixed to a lower end of one of the lead screws 14, synchronizing wheels 16 are fixedly connected to lower ends of the two lead screws 14, a synchronous belt 17 is sleeved on the two synchronizing wheels 16, when one of the lead screws 14 rotates, the other lead screw 14 can be driven to rotate, and the synchronizing wheels 16 and the synchronous belt 17 can be located inside the supporting block 21, when the lower cabinet door 5 needs to be opened, the servo motors are started, and under the action of the synchronous belt 17, the two lead screws 14 rotate, so that the lower cabinet door 5 is controlled to gradually move upwards, and after the supporting plate 13 abuts against the upper cabinet door 4, the upper cabinet door 4 is driven to move upwards together until openings of the working chamber 3 are all opened.

The lower end of a screw rod 14 connected with a servo motor is provided with a gear transmission mechanism, the gear transmission mechanism is driven in a manual mode, the output end of the gear transmission mechanism is connected with the lower end of the screw rod 14, a first bevel gear is fixedly connected to the lower end of the screw rod 14 and is positioned above a synchronizing wheel 16, a second bevel gear is rotatably connected to the inside of a supporting block 21, the first bevel gear and the second bevel gear are meshed with each other, a handle extending out of the supporting block 21 is fixedly connected to the second bevel gear, when the servo motor fails or power fails, a worker can manually open or close a cabinet door for emergency use, and the situation that an opening of a working chamber 3 is always in an open state is avoided.

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 (9)

1. The utility model provides a no counter weight fume chamber with quick overhead door which characterized in that: including the cabinet body (1), cabinet body (1) upper portion is provided with ventilation unit (2), cabinet body (1) lower part is provided with the storeroom, working chamber (3) with the outside intercommunication of the cabinet body (1) are seted up at cabinet body (1) middle part, the opening part slip of working chamber (3) is provided with the cabinet door, be provided with the controlling means that the control cabinet door was opened on the cabinet body (1), controlling means is including rotating lead screw (14) and drive lead screw (14) pivoted drive assembly (15) of connecting on the cabinet body (1), cabinet door and lead screw (14) screw-thread fit.

2. A counterweighted fumehood with a quick-rise door in accordance with claim 1, wherein: the pair of the screw rods (14) is arranged, the two screw rods (14) are symmetrically arranged at two ends of the cabinet door, the cabinet door is in threaded fit with the two screw rods (14), and the driving assembly (15) drives the two screw rods (14) to synchronously rotate.

3. A counterweighted fumehood with a quick-rise door in accordance with claim 1, wherein: the cabinet door comprises an upper cabinet door (4) and a lower cabinet door (5), wherein the upper cabinet door (4) and the lower cabinet door (5) are in sliding fit with the opening of the working chamber (3), the lower cabinet door (5) and the upper cabinet door (4) are arranged in a staggered mode from front to back, the lower cabinet door (5) is in threaded fit with the two lead screws (14), and a supporting plate (13) extending towards the inside of the working chamber (3) is arranged on one side, away from the upper cabinet door (4), of the lower cabinet door (5).

4. A counterweighted fumehood with a quick-rise door in accordance with claim 3 wherein: the cabinet body (1) is provided with a pair of first spout (6) and a pair of second spout (7) on being close to the inner wall of working chamber (3) opening part, the both ends setting of lower cabinet door (5) is in first spout (6), the both ends setting of going up cabinet door (4) is in second spout (7), the length of second spout (7) is less than the length of first spout (6).

5. A counterweighted fumehood with a quick-rise door in accordance with claim 4 wherein: first spout (6) and second spout (7) are inside all to be provided with sealed pad (8) that are the U-shaped, the symmetry is provided with sealing strip (9) on the inner wall of sealed pad (8) opening part, be provided with elastic gasket (10) between the downside of going up cabinet door (4) and the upside of lower cabinet door (5).

6. A counterweightless fumehood with a quick-rise door according to claim 3 wherein: one side that last cabinet door (4) were kept away from in lower cabinet door (5) is provided with and is C shape strip (27), the strip (27) of borduring deviate from cabinet door (5) down and be provided with the rubber pad on the surface.

7. A counterweightless fumehood with a quick-rise door according to claim 1 wherein: the cabinet body (1) is located fixedly connected with a supporting block (21) on the outer surface of the lower side of the opening of the working cavity (3), and the supporting block (21) is of an internal hollow structure.

8. A counterweightless fumehood with a quick-rise door according to claim 1 wherein: a protective cover (20) covering the two screw rods (14) is fixed on the cabinet body (1).

9. A counterweightless fumehood with a quick-rise door according to claim 1 wherein: the cabinet door is provided with a pressure sensor, and the pressure sensor is matched with the control device; the cabinet body (1) is provided with a concentration detector (26) on the inner surface of the working cavity (3), and the concentration detector (26) is matched with the ventilation device (2).

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