Internal circulation self-purification ventilation cabinet

Abstract

The invention discloses an internal circulation self-purification ventilation cabinet which comprises a ventilation cabinet body and a purification mechanism, the ventilation cabinet body comprises a ventilation cabinet body, an air inlet and an air outlet are formed in the two ends of the ventilation cabinet body respectively, and the air inlet is communicated with the air outlet end of a fan; the purifying mechanism comprises a purifying cabinet, a moving plate, a plurality of filters, a moving driving part, a lower connecting assembly and an upper connecting assembly. The device has the beneficial effects that through the design of the movable plate and the movable driving piece, horizontal movement of the filters is achieved, different filters on the movable plate can reach set positions according to needs, accurate connection and sealing of the filters in the replacement process are ensured through the design of the lower connecting assembly and the upper connecting assembly, and the replacement efficiency is improved. And the problem that the purification effect is reduced due to improper installation is avoided. Through system integration and automatic control, rapid and automatic replacement of the filter is realized, the working efficiency of a laboratory is improved, and manual intervention and downtime are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fume hoods, and in particular to an internal circulation self-purification fume hood. Background Art

[0002] Fume hoods are indispensable safety protection equipment in laboratory environments. Their main function is to effectively control the diffusion of air pollutants, protect the safety of operators, and ensure the accuracy of experimental results. Traditional fume hood designs rely on the introduction and exhaust of external air. This method not only consumes a lot of energy, but also requires the layout of a ventilation duct system extending to the outdoors, and may also have a certain impact on the outdoor environment. With the advancement of technology, internal circulation self-purification fume hoods came into being and became an ideal choice for modern laboratories.

[0003] The internal circulation self-purification fume hood adopts an advanced internal circulation ventilation system, which is composed of a high-efficiency filter and a circulating fan. The air enters the cabinet after being filtered by the high-efficiency filter, and then is driven by the circulating fan to form a circulating flow in the cabinet. In this process, the circulating fan takes away the pollutants and purifies them again through the high-efficiency filter. The purified gas is passed into the cabinet again to form a cycle. This internal circulation method not only effectively saves energy, but also does not require the layout of a ventilation duct system extending to the outdoors, and also significantly reduces the impact on the outdoor environment.

[0004] Although internal circulation self-purification fume hoods have many advantages in laboratory environments, there are still some problems when replacing filter elements (or filters). At present, the internal circulation fume hoods on the market cannot automatically replace the filter elements when replacing them. This defect causes operators to face great difficulties when replacing the filter elements.

[0005] Specifically, replacing the filter element requires manual operation, and the operation process is relatively complicated. Since the filter element is usually located in a relatively hidden position inside the fume hood, the operator needs to disassemble some parts to access the filter element. This not only increases the difficulty of operation, but may also cause the filter element to fail to be installed in place during the installation process, thereby affecting the purification effect of the fume hood.

[0006] In addition, since fast and automatic replacement cannot be achieved, when the filter element needs to be replaced, the operator needs to spend a long time to complete the replacement work. This not only affects the work efficiency of the laboratory, but also may cause the air quality to deteriorate due to untimely replacement of the filter element, posing a potential threat to the health of the operator. Therefore, how to improve the filter element replacement method of the internal circulation self-purification fume hood to achieve fast, simple and reliable replacement is an urgent problem to be solved. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an internal circulation self-purification fume hood to solve the technical problems in the prior art that the filter element (or filter) is inconvenient to replace, the operation is complicated and it is difficult to ensure the installation is in place, and the filter element (or filter) cannot be replaced quickly and automatically.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides an internal circulation self-purification fume hood, comprising: A fume hood, the fume hood comprising a fume hood body, an air inlet and an air outlet are respectively provided at two ends of the fume hood body, the air inlet is connected to an air outlet end of a fan; and, The purification mechanism includes a purification cabinet, a movable plate, a plurality of filters, a movable driving member, a lower connecting component and an upper connecting component. The movable plate is slidably arranged in the purification cabinet, and each of the filters is fixed to the movable plate. The movable driving member is used to drive the movable plate to move horizontally. When any filter moves between the lower connecting component and the upper connecting component, the lower connecting component can connect the lower end of the filter with the air inlet end of the fan, and the upper connecting component can connect the upper end of the filter with the air outlet.

[0009] In some embodiments, the lower connecting assembly includes a lower connecting head, a lower connecting hose and a lower connecting driving member, one end of the lower connecting hose is connected to the air inlet end of the fan, and the other end of the lower connecting hose is connected to one end of the lower connecting head. The lower connecting driving member is disposed in the purification cabinet and connected to the lower connecting head, and is used to drive the lower connecting head to move up and down so that the lower connecting head is connected or disconnected with the lower end of the filter.

[0010] In some embodiments, the lower connecting assembly also includes a lower connecting rigid tube, one end of which is connected to the air inlet, a mounting hole is provided on the side wall of the other end of the lower connecting rigid tube, one end of the lower connecting hose is connected to the mounting hole, and the fan is disposed in the lower connecting rigid tube.

[0011] In some embodiments, the lower connecting drive member includes two lower connecting plates, two lower screws, two synchronous wheels, a synchronous belt and a first rotating drive member. The two lower connecting plates are fixed to the lower connecting head. Lower screw holes are opened on the two lower connecting plates. The two lower screws are rotatably set in the purification cabinet. The two lower screws are threadedly connected to the two lower screw holes. The two synchronous wheels are coaxially fixed to the two lower screws, and the two ends of the synchronous belt are respectively wound around the two synchronous wheels. The first rotating drive member is connected to one of the lower screws and is used to drive the lower screw to rotate.

[0012] In some embodiments, the first rotating drive member includes a first rotating drive motor, a first sprocket, a second sprocket and a chain. The housing of the first rotating drive motor is fixed in the purification cabinet. The output shaft of the first rotating drive motor is coaxially fixedly connected to the first sprocket. The second sprocket is coaxially fixed to one of the lower screw rods. The chain is closed, and the two ends of the chain are respectively wound around the first sprocket and the second sprocket.

[0013] In some embodiments, the upper connection assembly includes an upper connecting head, an upper connecting hose, an upper connecting hard pipe and an upper connecting driving member, one end of the upper connecting hose is connected to the upper end of the upper connecting head, the other end of the upper connecting hose is connected to one end of the upper connecting hard pipe, the other end of the upper connecting hard pipe is connected to the air outlet, and the upper connecting driving member is connected to the upper connecting head and is used to drive the upper connecting head to move up and down so that the upper connecting head is connected or disconnected with the upper end of the filter.

[0014] In some embodiments, the upper connecting drive member includes an upper connecting plate, an upper guide rod, an outer connecting plate, an upper screw rod and a second rotating drive member, the upper connecting plate is fixed to the upper connecting head, a guide hole is provided on the upper end surface of the purification cabinet, the upper guide rod is slidably inserted in the guide hole, the two ends of the upper guide rod are respectively fixed to the outer connecting plate and the upper connecting plate, the outer connecting plate is provided with an upper screw hole, the upper screw rod is rotatably arranged above the purification cabinet, the upper screw rod is threadedly inserted in the upper screw hole, and the second rotating drive member is connected to the upper screw rod and is used to drive the upper screw rod to rotate.

[0015] In some embodiments, the second rotation driving member includes a mounting frame and a rotation driving motor, the mounting frame is fixed to the upper end of the purification cabinet, the upper end of the upper screw is rotationally connected to the mounting frame, the lower end of the upper screw is rotationally connected to the purification cabinet, the housing of the rotation driving motor is fixed to the mounting frame, and the output shaft of the rotation driving motor is coaxially and fixedly connected to the upper screw.

[0016] In some embodiments, the movable plate is provided with a plurality of vent holes, the upper end surface of the movable plate is formed with a plurality of first mounting flanges coaxial with the respective vent holes, and the lower end of each filter is formed with a second mounting flange matched with the first mounting flange; the lower connecting driving member is used to connect or disconnect the lower connector with the lower end of the vent hole; The mobile driving component includes a plurality of rollers, a roller driving component and a distance sensor. Each of the rollers is rotatably arranged in the clean room. The roller driving component is connected to each of the rollers and is used to drive each of the rollers to rotate. The mobile plate is placed on the rollers. The distance sensor is fixed to the inner wall of the clean room and is used to detect the distance between itself and the mobile plate.

[0017] In some embodiments, a pressure sensor is installed on the upper connecting rigid tube.

[0018] Compared with the prior art, the internal circulation self-purifying fume hood provided by the present invention has the following beneficial effects: through the design of the moving plate and the moving drive member, the horizontal movement of the filter is realized, so that different filters on the moving plate can reach the set position as needed, and the design of the lower connecting component and the upper connecting component ensures the accurate connection and sealing of the filter during the replacement process, avoiding the problem of reduced purification effect due to improper installation. Through system integration and automatic control, the rapid and automatic replacement of the filter is realized, the work efficiency of the laboratory is improved, and manual intervention and downtime are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an internal circulation self-purification fume hood provided by an embodiment of the present invention; Figure 2 yes Figure 1 A partial enlarged view of area A in FIG. Figure 3 yes Figure 1 A partial enlarged view of region B in FIG. Description of the accompanying drawings: 1-fume hood, 11-fume hood body, 111-air inlet, 112-air outlet, 113-first air duct, 114-second air duct, 115-air outlet, 2-purification mechanism, 21-purification cabinet, 22-movable plate, 221-ventilation hole, 222-first mounting flange, 23-filter, 231-second mounting flange, 24-moving drive member, 241-roller, 242-distance sensor, 25-lower connecting assembly, 251-lower connecting head, 252-lower connecting hose, 253-lower connecting drive member, 2531-lower connecting plate, 2532-lower screw, 2533-synchronizing wheel, 2534-same Step belt, 2535-first rotating drive member, 25351-first rotating drive motor, 25352-first sprocket, 25353-second sprocket, 25354-chain, 254-lower connecting tube, 2541-mounting hole, 26-upper connecting assembly, 261-upper connecting head, 262-upper connecting hose, 263-upper connecting tube, 2631-pressure sensor, 264-upper connecting drive member, 2641-upper connecting plate, 2642-upper guide rod, 2643-outer connecting plate, 2644-upper screw, 2645-second rotating drive member, 26451-mounting frame, 26452-rotating drive motor, 3-fan. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to solve the technical problems in the prior art that filter elements (or filters) are inconvenient to replace, the operation is complicated and it is difficult to ensure that they are installed in place, and the filter elements (or filters) cannot be replaced quickly and automatically, the present invention provides an internal circulation self-purification fume hood that can simplify the filter element replacement process, ensure that the filter element is accurately installed, and can quickly and automatically complete the replacement operation.

[0022] See also Figure 1-Figure 3 , Figure 1 Schematic diagram of the structure of an internal circulation self-purification fume hood in one embodiment of the present invention. The internal circulation self-purification fume hood includes a fume hood 1 and a purification mechanism 2.

[0023] The fume hood 1 comprises a fume hood body 11 , and an air inlet 111 and an air outlet 112 are respectively provided at two ends of the fume hood body 11 , and the air inlet 111 is connected to an air outlet end of a fan 3 . The purification mechanism 2 includes a purification cabinet 21, a movable plate 22, a plurality of filters 23, a movable driving member 24, a lower connecting assembly 25 and an upper connecting assembly 26. The movable plate 22 is slidably arranged in the purification cabinet 21, and each of the filters 23 is fixed to the movable plate 22. The movable driving member 24 is used to drive the movable plate 22 to move horizontally, so that each filter 23 can be moved between the lower connecting assembly 25 and the upper connecting assembly 26. When any filter 23 moves between the lower connecting assembly 25 and the upper connecting assembly 26, the lower connecting assembly 25 can make the lower end of the filter 23 communicate with the air inlet end of the fan 3, and the upper connecting assembly 26 can make the upper end of the filter 23 communicate with the air outlet 112. It should be understood that the filter 23 can select a suitable filter according to the type of harmful gas. For example, if the harmful gas is dust gas, the filter can select a microporous filter.

[0024] When the internal circulation self-purifying fume hood is in normal working state, the fan 3 is started, and the purified air is sucked from the air inlet 111 of the fume hood body 11. After the air enters the fume hood body 11, it takes away the harmful gas and is discharged from the air outlet 112, and then enters the filter 23 through the upper connecting component 26. After the filter 23 absorbs the harmful gas, the purified air enters the air inlet end of the fan 3 from the lower connecting component 25, and then enters the air inlet 111, forming an internal circulation. When the system detects that the filter 23 currently in use has reached the replacement standard, the system will send a replacement signal. At this time, the upper connecting component 26 and the lower connecting component 25 are separated from the upper and lower ends of the filter 23 respectively, and then the moving driving member 24 is started to drive the moving plate 22 to move horizontally, so that another filter 23 moves to the position between the lower connecting component 25 and the upper connecting component 26. When the other filter 23 reaches the predetermined position, the lower connecting component 25 is automatically connected to the lower end of the filter 23 to ensure that the air inlet end of the filter 23 is closely connected with the air inlet end of the fan 3. At the same time, the upper connecting assembly 26 is also automatically connected to the upper end of the filter 23, ensuring that the air outlet end of the filter 23 is connected to the air outlet 112. After the replacement is completed, the fan 3 continues to work, and the new filter 23 begins to perform the air purification task. The staff can remove the old filter 23 from the movable plate 22 during their free time, and then replace it with another new filter 23 and install it at a predetermined position on the movable plate 22.

[0025] The technical solution provided by the present invention realizes the horizontal movement of the filter 23 through the design of the moving plate 22 and the moving driving member 24, so that different filters 23 on the moving plate 22 can reach the set position as needed. The design of the lower connecting component 25 and the upper connecting component 26 ensures the accurate connection and sealing of the filter 23 during the replacement process, avoiding the problem of reduced purification effect due to improper installation. Through system integration and automatic control, the rapid and automatic replacement of the filter is realized, the working efficiency of the laboratory is improved, and manual intervention and downtime are reduced.

[0026] In one embodiment, see Figure 1 and Figure 2 The lower connection assembly 25 includes a lower connection head 251, a lower connection hose 252 and a lower connection driving member 253. One end of the lower connection hose 252 is connected to the air inlet end of the fan 3, and the other end is connected to one end of the lower connection head 251. The lower connection driving member 253 is disposed in the purification cabinet 21 and connected to the lower connection head 251, and is used to drive the lower connection head 251 to move up and down, so that the lower connection head 251 is connected to or disconnected from the lower end of the filter 23.

[0027] In one embodiment, see Figure 1 and Figure 2 The lower connection assembly 25 further includes a lower connection hard tube 254. One end of the lower connection hard tube 254 is connected to the air inlet 111, and a mounting hole 2541 is provided on the side wall of the other end. One end of the lower connection hose 252 is connected to the mounting hole 2541, and the fan 3 is arranged in the lower connection hard tube 254. The length of the lower connection hose 252 can be extended to adapt to the up and down movement of the lower connector 251.

[0028] In one embodiment, see Figure 1 and Figure 2 , the lower connecting driving member 253 includes two lower connecting plates 2531, two lower screw rods 2532, two synchronous wheels 2533, a synchronous belt 2534 and a first rotating driving member 2535. The two lower connecting plates 2531 are fixed to the lower connecting head 251, and the two lower connecting plates 2531 are provided with lower screw holes. The two lower screw rods 2532 are rotatably arranged in the purification cabinet 21, and are threadedly rotatably connected in the two lower screw holes. The two synchronous wheels 2533 are coaxially fixed to the two lower screw rods 2532, and the two ends of the synchronous belt 2534 are respectively wound around the two synchronous wheels 2533. The first rotating driving member 2535 is connected to one of the lower screw rods 2532, and is used to drive the lower screw rod 2532 to rotate, thereby driving the other lower screw rod 2532 to rotate synchronously through the synchronous belt 2534, so as to realize the up and down movement of the lower connecting head 251.

[0029] When the lower connecting head 251 needs to be driven to move up and down, the system issues a command to start the first rotating driving member 2535, and the first rotating driving member 2535 starts to work, driving the lower screw rod 2532 connected thereto to rotate. The rotating lower screw rod 2532 drives another lower screw rod 2532 to rotate synchronously through the synchronous belt 2534. Since the two lower screw rods 2532 are respectively threadedly connected to the two lower screw holes of the lower connecting plate 2531, the rotating lower screw rod 2532 drives the lower connecting plate 2531 (and the lower connecting head 251) to move up and down.

[0030] In one embodiment, see Figure 1 and Figure 2 The first rotating driving member 2535 includes a first rotating driving motor 25351, a first sprocket 25352, a second sprocket 25353 and a chain 25354. The housing of the first rotating driving motor 25351 is fixed in the purification cabinet 21, and the output shaft of the first rotating driving motor 25351 is coaxially fixedly connected with the first sprocket 25352. The second sprocket 25353 is coaxially fixed to one of the lower screw rods 2532, and the chain 25354 is closed and wound around the first sprocket 25352 and the second sprocket 25353. When in use, the first rotating driving motor 25351 drives the first sprocket 25352 to rotate, the first sprocket 25352 drives the second sprocket 25353 to rotate via the chain 25354, and the second sprocket 25353 drives a lower screw rod 2532 to rotate.

[0031] In one embodiment, see Figure 1 and Figure 3 The upper connection assembly 26 includes an upper connection head 261, an upper connection hose 262, an upper connection hard pipe 263 and an upper connection driving member 264. One end of the upper connection hose 262 is connected to the upper end of the upper connection head 261, and the other end is connected to one end of the upper connection hard pipe 263. The other end of the upper connection hard pipe 263 is connected to the air outlet 112. The upper connection driving member 264 is connected to the upper connection head 261 and is used to drive the upper connection head 261 to move up and down, so that the upper connection head 261 is connected to or disconnected from the upper end of the filter 23.

[0032] In one embodiment, see Figure 1 and Figure 3, the upper connecting driving member 264 includes an upper connecting plate 2641, an upper guide rod 2642, an outer connecting plate 2643, an upper screw rod 2644 and a second rotating driving member 2645. The upper connecting plate 2641 is fixed to the upper connector 261, and a guide hole is provided on the upper end surface of the purification cabinet 21, and the upper guide rod 2642 is slidably inserted into the guide hole. The two ends of the upper guide rod 2642 are respectively fixed to the outer connecting plate 2643 and the upper connecting plate 2641. The outer connecting plate 2643 is provided with an upper screw hole, and the upper screw rod 2644 is rotatably arranged above the purification cabinet 21 and is threadedly inserted into the upper screw hole. The second rotating driving member 2645 is connected to the upper screw rod 2644 and is used to drive the upper screw rod 2644 to rotate.

[0033] In this embodiment, when it is necessary to drive the upper connector 261 to move up and down, the system issues a command to start the second rotation drive member 2645. The second rotation drive member 2645 starts to work and drives the upper screw rod 2644 to rotate. Since the upper screw rod 2644 is threadedly connected to the upper screw hole on the outer connecting plate 2643, the rotating upper screw rod 2644 will push or pull the outer connecting plate 2643 along the thread direction. Since the outer connecting plate 2643 is connected to the upper connector 261 through the upper guide rod 2642 and the upper connecting plate 2641, the movement of the outer connecting plate 2643 will drive the upper connector 261 to move up and down along the guide hole. If the upper screw rod 2644 rotates clockwise, the upper connector 261 will move downward; if it rotates counterclockwise, it will move upward, thereby realizing the up and down movement of the upper connector 261.

[0034] In one embodiment, see Figure 1 and Figure 3 , the second rotation driving member 2645 includes a mounting frame 26451 and a rotation driving motor 26452. The mounting frame 26451 is fixed to the upper end of the purification cabinet 21, the upper end of the upper screw 2644 is rotationally connected to the mounting frame 26451, and the lower end is rotationally connected to the purification cabinet 21. The housing of the rotation driving motor 26452 is fixed to the mounting frame 26451, and the output shaft of the rotation driving motor 26452 is coaxially fixedly connected to the upper screw 2644. When in use, the rotation driving motor 26452 drives the upper screw 2644 to rotate, thereby realizing the up and down movement of the upper connector 261.

[0035] In one embodiment, see Figure 1-Figure 3, a plurality of vent holes 221 are provided on the movable plate 22, and a plurality of first mounting flanges 222 coaxial with each of the vent holes 221 are formed on the upper end surface of the movable plate 22. A second mounting flange 231 matching with the first mounting flange 222 is formed at the lower end of each of the filters 23. The lower connecting driving member 253 is used to connect or disconnect the lower connector 251 with the lower end of the vent hole 221. The movable driving member 24 includes a plurality of rollers 241, a roller driving member and a distance sensor 242. Each of the rollers 241 is rotatably arranged in the purification cabinet 21, and the roller driving member is connected to each of the rollers 241 and is used to drive each of the rollers 241 to rotate. The movable plate 22 is laid on the roller 241, and the distance sensor 242 is fixed to the inner wall of the purification cabinet 21 and is used to detect the distance between itself and the movable plate 22 to monitor the position of the movable plate 22. Several preset positions are stored in the system. When the movable plate 22 moves to these positions, different filters 23 can reach the position between the lower connecting component 25 and the upper connecting component 26.

[0036] In one embodiment, see Figure 1 A pressure sensor 2631 is installed on the upper connecting hard pipe 263 to monitor the pressure in the upper connecting hard pipe 263. When the pressure exceeds the preset pressure, it indicates that the filter 23 needs to be replaced.

[0037] In one embodiment, see Figure 1 The lower part of the fume hood 11 is provided with a first air duct 113, the side wall of the fume hood 11 is provided with a second air duct 114, the inner side wall of the fume hood 11 is provided with a plurality of air outlet holes 115 connected with the second air duct 114, the first air duct 113 is connected with the air inlet 111, and the second air duct 114 is connected with the first air duct 113. When in use, the purified gas enters the first air duct 113 from the air inlet 111, then enters each second air duct 114, and then enters the fume hood 11 from each air outlet hole 115. By providing a plurality of second air ducts 114 and a plurality of air outlet holes 115, the air outlet uniformity can be improved.

[0038] In order to better understand the present invention, the following Figures 1 to 3The technical solution of the present invention is described in detail: when the internal circulation self-purifying fume hood is in normal working state, the fan 3 is started, and the purified air is sucked from the air inlet 111 of the fume hood body 11. After the air enters the fume hood body 11, it takes away the harmful gas and is discharged from the air outlet 112, and then enters the filter 23 through the upper connecting component 26. After the filter 23 absorbs the harmful gas, the purified air enters the air inlet end of the fan 3 from the lower connecting component 25, and then enters the air inlet 111 to form an internal circulation. When the system detects that the currently used filter 23 reaches the replacement standard, the system will send a replacement signal. At this time, the upper connecting component 26 and the lower connecting component 25 are separated from the upper and lower ends of the filter 23 respectively, and then the moving driving member 24 is started to drive the moving plate 22 to move horizontally, so that another filter 23 moves to the position between the lower connecting component 25 and the upper connecting component 26. When the other filter 23 reaches the predetermined position, the lower connecting component 25 is automatically connected to the lower end of the filter 23 to ensure that the air inlet end of the filter 23 is closely connected with the air inlet end of the fan 3. At the same time, the upper connecting assembly 26 is also automatically connected to the upper end of the filter 23 to ensure that the air outlet end of the filter 23 is connected to the air outlet 112. After the replacement is completed, the fan 3 continues to work, and the new filter 23 starts to perform the air purification task. The staff can remove the old filter 23 from the movable plate 22 during their free time, and then replace it with another new filter 23 and install it at a predetermined position on the movable plate 22. Specifically, it is only necessary to align the second mounting flange 231 of the new filter 23 with the first mounting flange 222 on the movable plate 22 and tighten it with bolts or screws.

[0039] The technical solution provided by the present invention realizes the horizontal movement of the filter 23 through the design of the moving plate 22 and the moving driving member 24, so that different filters 23 on the moving plate 22 can reach the set position as needed. The design of the lower connecting component 25 and the upper connecting component 26 ensures the accurate connection and sealing of the filter 23 during the replacement process, avoiding the problem of reduced purification effect due to improper installation. Through system integration and automatic control, the rapid and automatic replacement of the filter is realized, the working efficiency of the laboratory is improved, and manual intervention and downtime are reduced.

[0040] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An internal circulation self-purification fume hood, characterized in that: include: A fume hood, the fume hood comprising a fume hood body, an air inlet and an air outlet are respectively provided at two ends of the fume hood body, the air inlet is connected to an air outlet end of a fan; and, The purification mechanism includes a purification cabinet, a movable plate, a plurality of filters, a movable driving member, a lower connecting component and an upper connecting component. The movable plate is slidably arranged in the purification cabinet, and each of the filters is fixed to the movable plate. The movable driving member is used to drive the movable plate to move horizontally. When any filter moves between the lower connecting component and the upper connecting component, the lower connecting component can connect the lower end of the filter with the air inlet end of the fan, and the upper connecting component can connect the upper end of the filter with the air outlet.

2. The internal circulation self-purification fume hood according to claim 1 is characterized in that: The lower connecting assembly includes a lower connecting head, a lower connecting hose and a lower connecting driving member, one end of the lower connecting hose is connected to the air inlet end of the fan, and the other end of the lower connecting hose is connected to one end of the lower connecting head. The lower connecting driving member is arranged in the purification cabinet and connected to the lower connecting head, and is used to drive the lower connecting head to move up and down so that the lower connecting head is connected or disconnected with the lower end of the filter.

3. The internal circulation self-purification fume hood according to claim 2 is characterized in that: The lower connecting assembly also includes a lower connecting hard tube, one end of which is connected to the air inlet, a mounting hole is provided on the side wall of the other end of the lower connecting hard tube, one end of the lower connecting hose is connected to the mounting hole, and the fan is arranged in the lower connecting hard tube.

4. The internal circulation self-purification fume hood according to claim 2 is characterized in that: The lower connecting driving member includes two lower connecting plates, two lower screw rods, two synchronous wheels, a synchronous belt and a first rotating driving member. The two lower connecting plates are fixed to the lower connecting head. The two lower connecting plates are provided with lower screw holes. The two lower screw rods are rotatably arranged in the purification cabinet. The two lower screw rods are threadedly connected to the two lower screw holes. The two synchronous wheels are coaxially fixed to the two lower screw rods, respectively. The two ends of the synchronous belt are respectively wound around the two synchronous wheels. The first rotating driving member is connected to one of the lower screw rods and is used to drive the lower screw to rotate.

5. The internal circulation self-purification fume hood according to claim 4 is characterized in that: The first rotating drive member includes a first rotating drive motor, a first sprocket, a second sprocket and a chain. The housing of the first rotating drive motor is fixed in the purification cabinet. The output shaft of the first rotating drive motor is coaxially fixedly connected to the first sprocket. The second sprocket is coaxially fixed to one of the lower screw rods. The chain is closed, and the two ends of the chain are respectively wound around the first sprocket and the second sprocket.

6. The internal circulation self-purification fume hood according to claim 1 is characterized in that: The upper connection assembly includes an upper connecting head, an upper connecting hose, an upper connecting hard pipe and an upper connecting driving member, one end of the upper connecting hose is connected to the upper end of the upper connecting head, the other end of the upper connecting hose is connected to one end of the upper connecting hard pipe, the other end of the upper connecting hard pipe is connected to the air outlet, the upper connecting driving member is connected to the upper connecting head, and is used to drive the upper connecting head to move up and down so that the upper connecting head is connected or disconnected with the upper end of the filter.

7. The internal circulation self-purification fume hood according to claim 6 is characterized in that: The upper connecting driving member includes an upper connecting plate, an upper guide rod, an outer connecting plate, an upper screw rod and a second rotating driving member, the upper connecting plate is fixed to the upper connecting head, a guide hole is provided on the upper end surface of the purification cabinet, the upper guide rod is slidably inserted in the guide hole, the two ends of the upper guide rod are respectively fixed to the outer connecting plate and the upper connecting plate, the outer connecting plate is provided with an upper screw hole, the upper screw rod is rotatably arranged above the purification cabinet, the upper screw rod is threadedly inserted in the upper screw hole, and the second rotating driving member is connected to the upper screw rod and is used to drive the upper screw rod to rotate.

8. The internal circulation self-purification fume hood according to claim 1 is characterized in that: The second rotation driving member includes a mounting frame and a rotation driving motor, the mounting frame is fixed to the upper end of the purification cabinet, the upper end of the upper screw is rotationally connected to the mounting frame, the lower end of the upper screw is rotationally connected to the purification cabinet, the housing of the rotation driving motor is fixed to the mounting frame, and the output shaft of the rotation driving motor is coaxially and fixedly connected to the upper screw.

9. The internal circulation self-purification fume hood according to claim 2 is characterized in that: The movable plate is provided with a plurality of vent holes, and the upper end surface of the movable plate is formed with a plurality of first mounting flanges coaxial with the respective vent holes, and the lower end of each filter is formed with a second mounting flange matched with the first mounting flange; the lower connecting driving member is used to connect or disconnect the lower connector with the lower end of the vent hole; The mobile driving component includes a plurality of rollers, a roller driving component and a distance sensor. Each of the rollers is rotatably arranged in the clean room. The roller driving component is connected to each of the rollers and is used to drive each of the rollers to rotate. The mobile plate is placed on the rollers. The distance sensor is fixed to the inner wall of the clean room and is used to detect the distance between itself and the mobile plate.

10. The internal circulation self-purification fume hood according to claim 6, characterized in that: A pressure sensor is installed on the upper connecting hard pipe.

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