Dust-free ventilation cabinet with waste gas treatment function

Abstract

The invention relates to the technical field of ventilation cabinets, in particular to a dust-free ventilation cabinet with a waste gas treatment function. Comprising a shell, the shell is slidably connected with observation glass, the shell is fixedly connected with a cleaning strip, the cleaning strip is fixedly connected with a flexible strip, and the shell is communicated with a collecting pipeline; the sliding block is connected to the shell in a sliding mode, the sliding block is connected with a sliding frame in a sliding mode, the sliding frame is provided with a first electromagnetic sliding rail, the first electromagnetic sliding rail of the sliding frame is connected with a first electromagnetic sliding block in a sliding mode, and the first electromagnetic sliding block is rotationally connected with a shell through a cylindrical rod. The moving speed of the arm of the operator is actively limited, so that the moving speed of the arm of the operator in the shell is passively reduced, the probability that the arm of the operator rapidly moves in the experiment process is reduced, and the probability that airflow in the shell is disordered due to rapid moving of the arm of the operator is reduced; and the risk that harmful gas in the shell overflows is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fume hoods, and in particular to a dust-free fume hood with an exhaust gas treatment function. Background Art

[0002] Fume hoods are indispensable safety equipment in chemical laboratories. Fume hoods are mainly used to collect and treat waste gas generated during chemical experiments to effectively control the spread of harmful gases. Traditional fume hoods are usually composed of an outer shell, a liftable observation glass, an exhaust gas extraction and treatment system, and a guide structure. When a fume hood is not used, the outer shell is closed by the observation glass to maintain a dust-free environment inside the outer shell. During the use of the fume hood, various experimental operations can be performed directly in the outer shell. However, when conducting experiments in the fume hood, once the operator's arm moves quickly, it will cause airflow turbulence in the cabinet, and even destroy the relative negative pressure environment in the outer shell, increasing the risk of harmful gas spillage. Therefore, the operator needs to actively control the operation speed at all times during the experiment, which will cause the operator's arm to feel fatigue due to long-term muscle tension, thereby affecting the safety of the experiment. Summary of the invention

[0003] In order to overcome the shortcomings mentioned in the above background, the present invention provides a dust-free fume hood with exhaust gas treatment function.

[0004] The technical solution is: a dust-free fume hood with exhaust gas treatment function, including: A housing, wherein the housing is slidably connected to an observation glass, a cleaning strip is fixedly connected to the housing near the observation glass, the cleaning strip is fixedly connected to a flexible strip that fits the observation glass, the housing is connected to a collection pipe, a guide plate is arranged inside the housing, and the guide plate is used to guide the gas entering the housing to the collection pipe; The sliding blocks have two symmetrically distributed ones, both of which are slidably connected to the shell, a symmetrically distributed first elastic member is arranged between the sliding blocks and the shell, the sliding blocks are slidably connected to a sliding frame, a first electromagnetic slide rail is arranged on the side of the sliding frame away from the adjacent sliding block, a first electromagnetic slider is slidably connected in the first electromagnetic slide rail of the sliding frame, and the first electromagnetic slider is rotatably connected to the shell through a cylindrical rod.

[0005] Further description: the shell is provided with an external water pump, the cleaning strip is provided with a plurality of water outlet holes connected with the external water pump, and the flexible strip is provided with a recessed portion for temporarily storing liquid and impurities.

[0006] It is further described that a second elastic member is fixedly connected between the sliding frame and the adjacent sliding block.

[0007] Further explanation includes: A motor is mounted on the housing, wherein the output shaft of the motor is fixedly connected to a lead screw, wherein the lead screw is provided with four threaded portions, and the rotation directions of two adjacent threaded portions are opposite; The extrusion plates have four plates that are spaced apart and are all slidably connected to the housing. The extrusion plates are threadedly connected to the lead screw. The lead screw is used to adjust the relative positions of the four extrusion plates so that two adjacent extrusion plates move in opposite directions. The sliding block is located between two adjacent extrusion plates. The two ends of the first elastic member are respectively fixed to the adjacent extrusion plates and the adjacent sliding blocks.

[0008] Further explanation includes: There are two air bags, which are respectively fixed to the adjacent shells.

[0009] Further explanation includes: There are two flexible blocks, and a chamber is set at the position on the shell for the cylindrical rod of the adjacent first electromagnetic slider to be rotatably connected. The flexible block is fixed in the chamber of the adjacent shell. The flexible block is located between the adjacent shell and the cylindrical rod of the adjacent first electromagnetic slider, and the contact surface between the flexible block and the cylindrical rod on the adjacent first electromagnetic slider is a rough surface.

[0010] It is further explained that an extrusion ring is slidably connected in the chamber of the shell, and the extrusion ring is used to extrude the adjacent flexible block. The chamber of the shell is connected to the airbag, and the elastic coefficient of the flexible block is smaller than the elastic coefficient of the airbag.

[0011] Further explanation includes: The second electromagnetic slider has two pieces, the housing is provided with a second electromagnetic slide rail, the second electromagnetic slider is slidably connected in the second electromagnetic slide rail of the adjacent housing, and the second electromagnetic slider is fixedly connected to a connecting frame; There are two limiting rings, which are respectively fixed to one side of the adjacent connecting frame close to the guide plate.

[0012] Further explanation includes: There are two movable rings, which are respectively fixed to the side of the adjacent connecting frame away from the adjacent limiting ring, and the movable ring is used to squeeze the airbag; There are several plugs, and all of them are fixed to the limiting ring through a connecting rope. The position of the airbag close to the limiting ring is provided with through holes with the same number as the plugs. The plugs are used to block adjacent through holes on the airbag.

[0013] Further explanation includes: There are two shielding members, which are respectively fixed to the adjacent limiting rings. The side of the shielding member away from the adjacent limiting ring is fixed to the shell, and the shielding member is made of flexible material.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention actively limits the movement speed of the operator's arm, so that the speed of the operator's arm moving in the shell is passively reduced, thereby reducing the probability of the operator moving the arm quickly during the experiment, thereby reducing the probability of the airflow in the shell being turbulent due to the rapid movement of the operator's arm, and thereby reducing the risk of harmful gas overflowing from the shell; 2. By making the observation glass close to the flexible strip during movement, when the smoke and dust particles generated by the chemical experiment remain on the rear side of the observation glass, the flexible strip will wipe the rear side of the observation glass to reduce the amount of impurities accumulated on the rear side of the observation glass, thereby ensuring the clarity of the observation glass; 3. By adjusting the position of the squeezing plate, the squeezing force of the squeezing plate on the first elastic member is changed, thereby adjusting the resistance of the sliding block when it moves, thereby adjusting the movement resistance of the shell to adapt to the use of different operators; 4. The shell wraps the operator's arm. When a deflagration occurs during a chemical experiment, the shell protects the arm, and the shell is supported by the second elastic member so that the shell does not contact the outer shell, thereby reducing the probability of the operator's body and clothes being contaminated with harmful substances in the chemical experiment, thereby improving the safety of the device; 5. The rough surface of the flexible block generates resistance to the shell, and the faster the operator's arm rotates, the greater the friction resistance between the flexible block and the cylindrical rod on the first electromagnetic slider. When the operator rotates his arm quickly during the experiment, the operator's arm is restricted in time, so that the operator's arm movement speed is suddenly reduced or even stopped, reducing the probability of experimental accidents caused by rapid arm movement; 6. All plugs are driven to move by the limit ring. At the moment when an accident occurs in the experiment and a deflagration occurs in the shell, the plug loses its blocking of the adjacent through-holes on the airbag. At the same time, the moving ring moves and squeezes the airbag, and the flame-retardant gas in the airbag is squeezed out through the through-hole. The flame-retardant gas is quickly released into the shell to extinguish the fire in the shell, so as to reduce the probability of fire spreading after the deflagration, thereby improving the safety of the device; 7. At the moment when an accident occurs in the experiment and a deflagration occurs in the shell, the limit ring drives the shielding member to move, and the shielding member quickly unfolds and wraps the operator's hands to protect the operator's hands and improve the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2It is a schematic diagram of the three-dimensional structure of the sliding frame of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the cleaning strip of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the lead screw of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the housing of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the housing of the present invention; Figure 7 It is a three-dimensional structural cross-sectional view of the housing, the airbag and the flexible block of the present invention; Figure 8 It is a three-dimensional structure explosion diagram of the limiting ring of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the plug of the present invention.

[0016] Markings in the accompanying drawings: 1: outer shell, 101: observation glass, 1011: cleaning strip, 1012: flexible strip, 102: collecting pipe, 103: guide plate, 2: sliding block, 3: sliding frame, 4: first electromagnetic slider, 5: shell, 6: motor, 7: screw, 8: extrusion plate, 9: airbag, 10: flexible block, 11: extrusion ring, 12: second electromagnetic slider, 13: connecting frame, 14: limiting ring, 15: moving ring, 16: plug, 17: shielding member. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0018] A dust-free fume hood with exhaust gas treatment function, such as Figure 1-Figure 5As shown, it includes a shell 1, the shell 1 is provided with a control terminal, the shell 1 is slidably connected to an observation glass 101, and a power member not shown in the figure is provided on the upper part of the observation glass 101. The power member is an existing structure and is electrically connected to the control terminal, and is used to drive the observation glass 101 to move up and down. A cleaning strip 1011 is fixedly connected to the position of the shell 1 near the observation glass 101, and the cleaning strip 1011 is fixedly connected to a flexible strip 1012 that fits the observation glass 101. The cleaning strip 1011 is located at the rear side of the observation glass 101. The control terminal is electrically connected to an external water pump, and a plurality of water outlets connected to the external water pump are provided on the cleaning strip 1011 to spray the glass cleaner onto the rear side of the observation glass 101. The flexible strip 1012 is provided with a recessed portion, and the glass cleaner on the surface of the observation glass 101 flows into the recessed portion along the flexible strip 1012. The recessed portion is used to temporarily store the glass cleaner and impurities. When the observation glass 101 moves up and down, the flexible strip 1012 wipes the rear side of the observation glass 101. The housing 1 is connected to a collection pipe The collecting pipe 102 is connected with the external exhaust device, wherein the external exhaust device is an existing structure and is not shown in the figure, and the external exhaust device is electrically connected with the control terminal. A guide plate 103 is arranged in the shell 1, and the guide plate 103 is used to guide the gas entering the shell 1 to the collecting pipe 102; the sliding block 2 has two symmetrically distributed on the left and right sides, both of which are slidably connected to the shell 1, and two first elastic members symmetrically distributed on the left and right sides are arranged between the sliding block 2 and the shell 1, wherein the first elastic member is a resistance spring, which is used to increase the resistance to the movement of the sliding block 2, the sliding block 2 is slidably connected with the sliding frame 3, and the sliding frame 3 and the adjacent sliding block 2 are fixedly connected with a second elastic member, wherein the second elastic member is a tension spring, which is used to increase the resistance to the movement of the sliding frame 3, and the shell 5 cannot always contact the shell 1, so as to reduce the probability of static electricity generated by the friction of the shell 5 in the test area of ​​the shell 1, and the upper side of the sliding frame 3 is provided with a first electromagnetic slide rail electrically connected with the control terminal, and the first electromagnetic slide rail of the sliding frame 3 is slidably connected with the first electromagnetic slider 4, and the first electromagnetic slider 4 is rotatably connected with the shell 5 through a cylindrical rod.

[0019] The specific working principle is as follows: Before using the device, initially, the observation glass 101 of the device is located at the lower limit position to prevent foreign matter from entering the housing 1 , and the first electromagnetic slider 4 is located at the front limit position so that the shell 5 is located outside the housing 1 .

[0020] When the operator needs to use the device to conduct a chemical experiment, the operator turns on the power part of the observation glass 101 through the control terminal, and the power part drives the observation glass 101 to move back and forth up and down. The observation glass 101 is pressed against the flexible strip 1012 during the movement, and the flexible strip 1012 wipes the rear side of the observation glass 101 to reduce the accumulation of impurities on the rear side of the observation glass 101. For example, smoke particles generated by chemical experiments remain on the rear side of the observation glass 101, thereby ensuring the clarity of the observation glass 101. If the impurities on the observation glass 101 cannot be scraped off by the flexible strip 1012, the operator can turn on the external water pump through the control terminal during the reciprocating movement of the observation glass 101, and the external water pump supplies glass cleaner to the cleaning strip 1011. Through all water outlets, the glass cleaner is sprayed onto the rear side of the observation glass 101 through the water outlet of the cleaning strip 1011. As the observation glass 101 moves back and forth up and down, the observation glass 101 is deeply cleaned, and the glass cleaner flows into the recessed part of the flexible strip 1012. Finally, the operator raises the observation glass 101 to the highest point and cleans the glass cleaner temporarily stored on the flexible strip 1012. When the observation glass 101 is wiped clean, since the front side of the observation glass 101 is easier to wipe, it can be wiped manually. The operator turns off the external water pump through the control terminal, and then adjusts the height of the observation glass 101 to a suitable position, that is, the lower side of the observation glass 101 is located at the neck of the operator, and turns off the power parts of the observation glass 101 through the control terminal.

[0021] When the observation glass 101 is cleaned, the operator places the items required for the experiment into the outer shell 1, and turns on the external exhaust device and the first electromagnetic slide rail through the control terminal. The first electromagnetic slider 4 slides backward, and the first electromagnetic slider 4 drives the shell 5 to move backward through the cylindrical rod, so that the shell 5 moves into the outer shell 1, and then the operator inserts both arms into the adjacent shells 5 respectively. Then the operator starts to conduct a chemical experiment, and the external exhaust device extracts the exhaust gas in the outer shell 1 through the collection pipe 102. The exhaust gas generated by the experiment is guided to the collection pipe 102 through the guide plate 103, and the exhaust gas generated by the experiment is collected and processed.

[0022] When the operator performs a chemical experiment, the operator needs to constantly move his arm to operate. When the operator moves his arm horizontally, the shell 5 is driven to move horizontally, and the shell 5 drives the cylindrical rod of the first electromagnetic slider 4 to move horizontally, so that the first electromagnetic slider 4 moves horizontally. The first electromagnetic slider 4 drives the sliding frame 3 to move horizontally through the first electromagnetic slide rail, and the sliding frame 3 drives the sliding block 2 to move. The first elastic member of the sliding block 2 is deformed, and the left and right first elastic members of the sliding block 2 are stretched and compressed respectively. The first elastic member provides resistance to the horizontal movement of the sliding block 2 to reduce the speed of the horizontal movement of the sliding block 2, thereby reducing the horizontal movement of the shell 5. The moving speed is that when the operator moves his arm vertically, the shell 5 moves downward, and the shell 5 drives the cylindrical rod of the first electromagnetic slider 4 to move downward, so that the first electromagnetic slider 4 moves downward, and the first electromagnetic slider 4 drives the sliding frame 3 to move downward through the first electromagnetic slide rail, so that the second elastic member of the sliding frame 3 is stretched and deformed, and the second elastic member provides resistance for the vertical movement of the sliding frame 3, thereby hindering the movement of the operator's arm, reducing the probability of the operator moving his arm quickly during the experiment, so as to reduce the probability of the airflow in the shell 1 being turbulent due to the rapid movement of the operator's arm, thereby reducing the risk of harmful gas overflow during chemical experiments.

[0023] When the experiment is completed, the operator collects and processes the items used in the experiment, then cleans the inside of the shell 1, and opens the first electromagnetic slide rail through the control terminal. The first electromagnetic slider 4 drives the shell 5 to reset through the cylindrical rod. Then the control terminal controls the closure of the first electromagnetic slide rail and the external exhaust device, and opens the power part of the observation glass 101. The power part drives the observation glass 101 to reset. Finally, the control terminal closes the power part of the observation glass 101.

[0024] like Figure 3-Figure 5 As shown, it also includes: a motor 6, which is installed on the housing 1, the motor 6 is electrically connected to the control terminal, the output shaft of the motor 6 is fixedly connected to a screw 7, the screw 7 is provided with four threaded parts, and the rotation directions of two adjacent threaded parts are opposite; there are four extrusion plates 8, which are distributed at intervals and are all slidably connected to the housing 1, the extrusion plates 8 are threadedly connected to the screw 7, the screw 7 is used to adjust the relative positions of the four extrusion plates 8 so that two adjacent extrusion plates 8 move in opposite directions, the sliding block 2 is located between the two adjacent extrusion plates 8, and the two ends of the first elastic member are respectively fixed to the adjacent extrusion plates 8 and the adjacent sliding blocks 2.

[0025] When different operators use this device, due to the different arm strengths of different operators, it is necessary to adjust the resistance encountered by the sliding block 2 during horizontal movement. The operator turns on the motor 6, and the output shaft of the motor 6 drives the screw 7 to rotate, and the screw 7 drives all the extrusion plates 8 to move. Taking the adjustment of the resistance encountered by the sliding block 2 during horizontal movement as an example, the two adjacent extrusion plates 8 of the sliding block 2 move toward each other, and the two adjacent extrusion plates 8 respectively squeeze the adjacent first elastic members, so that the first elastic members are compressed, and the resistance encountered by the sliding block 2 during movement is increased, thereby realizing the adjustment of the movement resistance of the shell 5 to adapt to the use of different operators. After the adjustment of the movement resistance of the sliding block 2 is completed, the operator turns off the motor 6 through the control terminal.

[0026] like Figure 6 As shown, it also includes: two airbags 9, which are respectively fixed to adjacent shells 5. During the experiment, the airbags 9 are used to fit and wrap the arms of the operator to protect the operator. By injecting air into the airbags 9, the airbags 9 can fit the arms of operators of different body shapes.

[0027] like Figure 6-Figure 8 As shown, it also includes: a flexible block 10, which has two, and a chamber is set at the position on the shell 5 for the cylindrical rod of the adjacent first electromagnetic slider 4 to be rotatably connected. The flexible block 10 is fixed to the lower part of the chamber of the adjacent shell 5. The flexible block 10 is located between the adjacent shell 5 and the cylindrical rod of the adjacent first electromagnetic slider 4. The contact surfaces between the flexible block 10 and the cylindrical rod on the adjacent first electromagnetic slider 4 are both rough surfaces. The flexible block 10 increases the rotational resistance of the cylindrical rod on the first electromagnetic slider 4 by wrapping the cylindrical rod of the adjacent first electromagnetic slider 4, and uses the deformation of the flexible block 10 to change the force with which the flexible block 10 wraps the cylindrical rod on the first electromagnetic slider 4.

[0028] like Figure 7 and Figure 8 As shown, an extrusion ring 11 is slidably connected in the chamber of the shell 5, and the extrusion ring 11 is used to extrude the adjacent flexible block 10. The chamber of the shell 5 is connected to the airbag 9. When the airbag 9 is compressed and deformed, a part of the gas in the airbag 9 is squeezed into the chamber of the adjacent shell 5, so that the extrusion ring 11 moves downward to extrude the adjacent flexible block 10. The elastic coefficient of the flexible block 10 is smaller than the elastic coefficient of the airbag 9, so that the flexible block 10 is more likely to deform when the airbag 9 is compressed.

[0029] The specific working principle is as follows: When the operator inserts the arm into the housing 5 , the operator's arm is inserted into and pressed against the airbag 9 .

[0030] When the operator is performing a chemical experiment, the operator needs to constantly move his arm to operate. When the operator rotates his arm, the shell 5 is driven to rotate. The rough surface of the flexible block 10 generates resistance to the cylindrical rod of the first electromagnetic slider 4, increasing the resistance encountered when the operator's arm rotates, thereby ensuring the stability of the airflow in the shell 1. The faster the operator's arm rotates, the greater the pressure on one side of the airbag 9. For example, taking the right airbag 9 as an example, if the operator's right arm flips to the left, the left part of the right airbag 9 will be compressed, and the gas in the right airbag 9 will be squeezed into the chamber of the right shell 5, and the right squeezing ring 11 will be pressed. Under pressure, the extrusion ring 11 squeezes the flexible block 10 to deform. Since the elastic coefficient of the flexible block 10 is smaller than the elastic coefficient of the airbag 9, the gas will first be injected into the chamber of the shell 5, causing the flexible block 10 to deform. Then the gas will squeeze the airbag 9 itself to deform, increasing the friction resistance between the flexible block 10 and the cylindrical rod on the first electromagnetic slider 4. The faster the operator's arm rotates, the greater the friction resistance between the flexible block 10 and the cylindrical rod on the first electromagnetic slider 4. The operator's arm is restricted in time, causing the operator's arm movement speed to drop sharply or even stop suddenly, reducing the probability of experimental accidents caused by rapid arm movement.

[0031] When the operator's arm no longer moves quickly, the airbag 9 and the flexible block 10 both rebound and return to their original positions, so that the extrusion ring 11 returns to its original position.

[0032] like Figure 6-Figure 8 As shown, it also includes: a second electromagnetic slider 12, which has two, the shell 5 is provided with a second electromagnetic slide rail electrically connected to the control terminal, the second electromagnetic slider 12 is slidably connected to the second electromagnetic slide rail of the adjacent shell 5, and a visual monitoring module is provided in the shell 1. At the moment of explosion in the shell 1, the visual monitoring module opens the second electromagnetic slide rail of the shell 5 through the control terminal, and the second electromagnetic slider 12 slides backward. The second electromagnetic slider 12 is fixedly connected to the connecting frame 13; there are two limiting rings 14, which are respectively fixedly connected to the rear sides of the adjacent connecting frames 13, and the limiting rings 14 are made of flexible material and are used to wrap the wrists of the operator.

[0033] like Figure 7-Figure 9 As shown, it also includes: two movable rings 15, which are respectively fixed to the front sides of adjacent connecting frames 13, and the movable rings 15 are used to squeeze the airbag 9 to squeeze the gas in the airbag 9 backwards; there are several plugs 16, which are all fixed to the limiting ring 14 through connecting ropes, and the airbag 9 is provided with through holes with the same number as the plugs 16 near the limiting ring 14, and the plugs 16 are used to block adjacent through holes on the airbag 9. In this embodiment, by setting a flame-retardant gas, such as carbon dioxide, in the airbag 9, the plugs 16 are used to control the flow state of the through holes of the airbag 9, thereby controlling the timing of spraying out the flame-retardant gas in the airbag 9.

[0034] like Figure 8 and Fig. 9 As shown, it also includes: a shielding member 17, which has two and is respectively fixed to the adjacent limiting rings 14, the front side of the shielding member 17 is fixed to the shell 5, the shielding member 17 is made of a flexible material, and the shielding member 17 is a flame-retardant cloth. In an emergency state, the shielding member 17 is unfolded and shields the operator's hands. Initially, the shielding member 17 is rolled up in the inner wall of the adjacent shell 5.

[0035] The specific working principle is as follows: Before using the device, the operator inserts the arm into the housing 5 and puts the wrist through the limiting ring 14 .

[0036] During the chemical experiment, if an accident occurs in the experiment, resulting in a deflagration in the shell 1, at the moment of the deflagration in the shell 1, the visual monitoring module opens the second electromagnetic slide rail of the shell 5 through the control terminal, so that the second electromagnetic slider 12 moves backward quickly, and the second electromagnetic slider 12 drives the connecting frame 13 to move backward, the connecting frame 13 drives the limit ring 14 and the movable ring 15 to move backward, the limit ring 14 drives all the connecting ropes to move backward, the connecting rope drives the plug 16 to move backward, the plug 16 loses the blockage of the adjacent through hole on the airbag 9, and at the same time the movable ring 15 moves backward to squeeze the airbag 9, and the flame-retardant gas in the airbag 9 is squeezed out through the through hole, and the flame-retardant gas is quickly released into the shell 1, and the fire in the shell 1 is extinguished to reduce the probability of fire spreading after the deflagration, thereby improving the safety of the use of the device.

[0037] During the process of the limit ring 14 moving backward, the limit ring 14 drives the shielding member 17 to move backward, and the limit ring 14 gradually moves away from the operator's hand. The shielding member 17 quickly unfolds and wraps the operator's hand to protect the operator's hand. The shell 5 and the airbag 9 protect the operator's arm to improve the safety of the device. Then the operator pulls out his arm in time and performs the fire extinguishing operation.

[0038] When the experiment is completed, the operator repeats the steps of the above embodiment to reset the device, reset the observation glass 101 and the shell 5, and then controls the first electromagnetic slide rail, the external exhaust device and the power parts of the observation glass 101 to be closed through the control terminal. After the explosion accident is handled, the operator opens the second electromagnetic slide rail through the control terminal, controls the second electromagnetic slider 12 to move and reset, and the second electromagnetic slider 12 drives the parts thereon to reset, reinserts the plug 16 into the adjacent through hole on the airbag 9, and then re-injects air into the airbag 9. If the airbag 9 is damaged, replace it with a new one.

[0039] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A dust-free fume hood with exhaust gas treatment function, characterized in that: Included are: A housing (1), the housing (1) being slidably connected to an observation glass (101), a cleaning strip (1011) being fixedly connected to the housing (1) at a position close to the observation glass (101), the cleaning strip (1011) being fixedly connected to a flexible strip (1012) that is in contact with the observation glass (101), the housing (1) being connected to a collection pipe (102), a guide plate (103) being arranged inside the housing (1), the guide plate (103) being used to guide gas entering the housing (1) into the collection pipe (102); The sliding blocks (2) have two symmetrically distributed ones, both of which are slidably connected to the housing (1); a symmetrically distributed first elastic member is arranged between the sliding blocks (2) and the housing (1); the sliding blocks (2) are slidably connected to a sliding frame (3); a first electromagnetic slide rail is arranged on a side of the sliding frame (3) away from the adjacent sliding blocks (2); a first electromagnetic slider (4) is slidably connected in the first electromagnetic slide rail of the sliding frame (3); and the first electromagnetic slider (4) is rotatably connected to the housing (5) via a cylindrical rod.

2. The dust-free fume hood with exhaust gas treatment function according to claim 1, characterized in that: The housing (1) is provided with an external water pump, the cleaning strip (1011) is provided with a plurality of water outlet holes connected to the external water pump, and the flexible strip (1012) is provided with a recessed portion, which is used for temporarily storing liquid and impurities.

3. The dust-free fume hood with exhaust gas treatment function according to claim 1, characterized in that: A second elastic member is fixedly connected between the sliding frame (3) and the adjacent sliding block (2).

4. The dust-free fume hood with exhaust gas treatment function according to claim 3, characterized in that: Also included are: A motor (6) is mounted on the housing (1); the output shaft of the motor (6) is fixedly connected to a lead screw (7); the lead screw (7) is provided with four threaded portions, and the rotation directions of two adjacent threaded portions are opposite; The extrusion plates (8) have four extrusion plates (8) which are spaced apart and are all slidably connected to the housing (1). The extrusion plates (8) are threadedly connected to the lead screw (7). The lead screw (7) is used to adjust the relative positions of the four extrusion plates (8) so that two adjacent extrusion plates (8) move in opposite directions. The sliding block (2) is located between two adjacent extrusion plates (8). Two ends of the first elastic member are respectively fixed to the adjacent extrusion plates (8) and the adjacent sliding blocks (2).

5. The dust-free fume hood with exhaust gas treatment function according to claim 1, characterized in that: Also included are: There are two airbags (9), which are respectively fixed to adjacent shells (5).

6. The dust-free fume hood with exhaust gas treatment function according to claim 5, characterized in that: Also included are: The flexible block (10) has two parts, a chamber is provided at a position on the shell (5) for rotationally connecting the cylindrical rod of the adjacent first electromagnetic slider (4), the flexible block (10) is fixedly connected to the chamber of the adjacent shell (5), the flexible block (10) is located between the adjacent shell (5) and the cylindrical rod of the adjacent first electromagnetic slider (4), and the contact surface between the flexible block (10) and the cylindrical rod on the adjacent first electromagnetic slider (4) is a rough surface.

7. The dust-free fume hood with exhaust gas treatment function according to claim 6, characterized in that: An extrusion ring (11) is slidably connected in the chamber of the shell (5), and the extrusion ring (11) is used to extrude the adjacent flexible block (10). The chamber of the shell (5) is in communication with the airbag (9), and the elastic coefficient of the flexible block (10) is smaller than the elastic coefficient of the airbag (9).

8. The dust-free fume hood with exhaust gas treatment function according to claim 7, characterized in that: Also included are: The second electromagnetic slider (12) has two pieces, the housing (5) is provided with a second electromagnetic slide rail, the second electromagnetic slider (12) is slidably connected in the second electromagnetic slide rail of the adjacent housing (5), and the second electromagnetic slider (12) is fixedly connected to a connecting frame (13); There are two limiting rings (14), which are respectively fixed to one side of an adjacent connecting frame (13) close to the guide plate (103).

9. The dust-free fume hood with exhaust gas treatment function according to claim 8, characterized in that: Also included are: There are two movable rings (15), which are respectively fixed to a side of an adjacent connecting frame (13) away from an adjacent limiting ring (14), and the movable ring (15) is used to squeeze the airbag (9); There are a plurality of plugs (16), each of which is fixed to the limiting ring (14) via a connecting rope. The airbag (9) is provided with through holes at a position close to the limiting ring (14) which are the same in number as the plugs (16). The plugs (16) are used to block adjacent through holes on the airbag (9).

10. The dust-free fume hood with exhaust gas treatment function according to claim 9, characterized in that: Also included are: The shielding members (17) have two members, and are respectively fixed to the adjacent limiting rings (14); the side of the shielding members (17) away from the adjacent limiting rings (14) is fixed to the shell (5); and the shielding members (17) are made of a flexible material.

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