Circulating ventilation system for laboratory

Abstract

The invention relates to the technical field of circulating ventilation, in particular to a circulating ventilation system for a laboratory, and adopts the technical scheme that the circulating ventilation system comprises a front housing and a ceiling ventilation opening outer frame, a ventilation main pipe is fixedly mounted on the top surface of the ceiling ventilation opening outer frame, and a rear housing is fixedly mounted on one side of the front housing; a wall hanging structure is fixedly installed on the side, away from the front cover shell, of the rear cover shell, a ventilation system is installed on the inner wall of the front cover shell, a corrugated pipe is arranged in the rear cover shell, a turnover connector is fixedly installed at one end of the corrugated pipe, and lifting devices are installed on the two sides, perpendicular to a small pipe connector, of a ceiling ventilation opening outer frame. The ventilation system has the beneficial effects that air in a laboratory can be sucked into the front cover shell by starting the ventilation system, and the position of the front cover shell is adjusted according to actual conditions through the detachable wall-mounted front cover shell, so that the purposes of improving the flexibility of the mounting position of an air inlet in the ventilation system and improving the ventilation efficiency are achieved. And dynamic adjustment can be carried out at any time according to actual requirements in a laboratory.

Description

Technical Field

[0001] The invention relates to the technical field of circulating ventilation, and in particular to a circulating ventilation system for a laboratory. Background Art

[0002] The laboratory circulation ventilation system is a system used to maintain indoor air circulation, remove harmful gases, maintain air quality and ensure the safety of the experimental environment. The air inlet position of the existing laboratory circulation ventilation system usually needs to be determined according to the laboratory layout, work nature and air circulation requirements. Common installation locations include the ceiling, wall, under the laboratory table or above the table in the laboratory; Since the existing air inlet structure is usually fixed, the installation position is difficult to move, and the air inlets at different positions have different exhaust and ventilation effects (for example, the air inlets on the ceiling and walls have a larger ventilation coverage, which is suitable for air exchange in the large environment inside the laboratory; while the air inlets near the laboratory table have a larger suction force, which can specifically deal with harmful gases, smoke or chemical vapors generated during experimental operations to avoid the spread of pollution sources), the most complete laboratory circulation ventilation system usually needs to be fully equipped with a complete set of air inlets on the ceiling, wall, under the laboratory table or above the table, which may cause the following problems during the installation and use of the ventilation system: 1. The cost of installing a complete set of laboratory circulation ventilation system (including ceiling, wall, under the laboratory table, above the table, etc.) is high. For some lower-level laboratories, the cost is high and may be unaffordable. Relatively speaking, these laboratories can only carry out reduced installation, resulting in the lack or insufficiency of ventilation function in the end use, which in turn affects the safety, comfort and work efficiency of the laboratory; 2. Fixed air inlets and ventilation systems may lack flexibility and cannot be dynamically adjusted according to the actual needs within the laboratory (for example, during certain experiments, specific areas may require more air circulation, while other areas do not need such strong winds). If the ventilation system cannot adjust automatically, the laboratory may waste energy or the ventilation effect of some areas may be insufficient; 3. The ventilation system near the laboratory table (such as tabletop fume hoods and local exhaust hoods) may occupy the operating space of the experimenter, limit the free movement on the laboratory table, and affect the convenience of experimental operation. In addition, the ventilation system with fixed installation mode has poor flexibility and cannot be quickly adjusted according to different experimental needs; Therefore, it is necessary to invent a circulating ventilation system for laboratories. Summary of the invention

[0003] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a circulating ventilation system for a laboratory, comprising a front cover shell and a ceiling vent outer frame, wherein the ceiling vent outer frame is fixedly mounted on the ceiling suspended ceiling board of the laboratory, a ventilation main pipe is fixedly mounted on the top surface of the ceiling vent outer frame, and the ventilation main pipe extends to the outside of the laboratory at one end away from the ceiling vent outer frame, a rear cover shell is fixedly mounted on one side of the front cover shell, a wall-mounted structure is fixedly mounted on the side of the rear cover shell away from the front cover shell, and the wall-mounted structure is used to hang and fix the rear cover shell on the laboratory wall, a ventilation duct is fixedly mounted on the laboratory wall above the rear cover shell, and a plurality of duct interfaces are fixedly mounted on two sides of the ceiling vent outer frame parallel to each other, and the upper ends of all the ventilation ducts extend upward to Different small tube interfaces are fixedly connected at the ceiling, the lower end of the ventilation small tube is used to connect to the top of the front cover shell hung on the wall, the inner wall of the front cover shell is installed with a ventilation system, the ventilation system is used to draw external air into the front cover shell, a bellows is arranged in the rear cover shell, one end of the bellows is fixedly installed with a flip joint, the flip joint is used to flip and connect to the top of the front cover shell, the other end of the bellows is fixedly installed with a ventilation plug, the ceiling vent outer frame is perpendicular to the two sides of the small tube interface and is provided with metal strips below, a number of ventilation sockets are installed on the metal strips, the ventilation plugs are used to be inserted into the ventilation sockets and connected to the ceiling vent outer frame, the ceiling vent outer frame is perpendicular to the two sides of the small tube interface and is installed with a lifting device, the lifting device is used to drive the metal strip to rise or fall.

[0004] Preferably, a side of the front cover shell close to the rear cover shell is set as an opening, and a side of the front cover shell away from the rear cover shell is set with a plurality of air inlet holes, the air inlet holes are arranged radially, a slot is set on one side of the front cover shell, a side panel is inserted and installed at the slot of the front cover shell, a semicircular groove is set on the surface of the side panel, and a ventilation interface is fixedly installed on the top surface of the front cover shell.

[0005] Preferably, the ventilation system includes an air suction plate, which is fixedly mounted on a portion of the inner wall of the front cover shell where an air inlet hole is provided, and a plurality of fan-shaped openings are provided on a side of the air suction plate away from the front cover shell, a motor is fixedly mounted on the inner wall of the side of the air suction plate away from the front cover shell, an exhaust fan is fixedly mounted on an output end of the motor close to the front cover shell, a filter plate is fixedly bonded on a side of the side panel away from the semicircular groove, the filter plate can be inserted into and installed inside the front cover shell from a groove on the side face of the front cover shell, and the filter plate is tightly attached to a surface of the side of the air suction plate away from the front cover shell.

[0006] Preferably, the ventilation duct is embedded in or installed on the surface or inside of the laboratory wall and ceiling, a telescopic hose is fixedly installed on the lower end of the ventilation duct, a ventilation joint is fixedly installed on the end of the telescopic hose away from the ventilation duct, and the ventilation joint can be inserted and installed in the top opening of the ventilation interface.

[0007] Preferably, the top surface of the rear cover shell is provided with a square groove, the flip joint is rotatably installed in the square groove on the top surface of the rear cover shell, the flip joint can be flipped out of the square groove on the top surface of the rear cover shell and inserted into the opening on the top surface of the ventilation interface, the side of the rear cover shell away from the front cover shell is set as an opening, and a plurality of clips are fixedly installed on the inner wall of the rear cover shell, and the corrugated tube is fixed on the clips by clipping.

[0008] Preferably, the wall-mounted structure includes a mounting bracket, bolts are inserted and installed on both sides of the mounting bracket, the bolts are used to fix the mounting bracket on the walls around the laboratory, and hooks are fixedly installed at two corners above the inner wall of the rear cover shell, and the hooks can be inserted and connected to the mounting bracket.

[0009] Preferably, a plurality of air guide plates are arranged and installed on the inner wall of the outer frame of the ceiling vent, and annular protrusions are provided at both upper and lower ends of the outer wall of the outer frame of the ceiling vent. The annular protrusions on the outer wall of the outer frame of the ceiling vent are used to fix the outer frame of the ceiling vent in a square opening reserved on the ceiling suspended ceiling panel, and a strip opening is provided on the surface of the annular protrusion at the lower end of the outer wall of the outer frame of the ceiling vent, and the strip opening is provided on both sides of the outer frame of the ceiling vent perpendicular to the small tube interface.

[0010] Preferably, the lifting device includes an upper track cabin, which is fixedly mounted on the annular raised bottom surface of the upper end of the outer wall of the ceiling vent frame above the strip opening, and a lower track cabin is arranged directly below the upper track cabin, a pair of upper sliders are slidably mounted on the bottom surface of the upper track cabin, and a pair of lower sliders are slidably mounted on the top surface of the lower track cabin, two ends of the lower track cabin are fixedly connected to two ends of the metal bar, and the two lower track cabins and the two metal bars form a rectangular frame structure.

[0011] Preferably, the first lifting link is rotatably mounted on one end of the upper slider away from the upper orbital cabin, the middle parts of the two first lifting links are rotatably connected to each other, the second lifting link is rotatably mounted on one end of the first lifting link away from the upper slider, the middle parts of the two second lifting links are rotatably connected to each other, the third lifting link is rotatably mounted on one end of the second lifting link away from the first lifting link, the middle parts of the two third lifting links are rotatably connected to each other, and the ends of the two third lifting links away from the second lifting links are rotatably connected to the two lower sliders respectively.

[0012] Preferably, a tooth plate is fixedly mounted on the top surface of the inner wall of the upper orbital cabin, a tooth groove is provided on the bottom surface of the tooth plate, a gear is rotatably mounted on the top surface of the upper slider, the top surface of the gear is meshed with the tooth groove on the bottom surface of the tooth plate, a strip slit is provided on one side of the outer wall of the upper orbital cabin, and a rotating shaft at one end of the gear extends from the strip slit of the upper orbital cabin to the outside of the upper orbital cabin and is fixedly connected to the motor.

[0013] The beneficial effects of the present invention are as follows: starting the ventilation system can draw the air in the laboratory into the front cover shell, and through the detachable wall-mounted front cover shell, the position of the front cover shell can be adjusted according to actual conditions; when no test of releasing harmful gases is carried out in the laboratory, multiple rear covers and front covers are hung and fixed on the walls of the laboratory through the wall-mounted structure, and then the lower end of the ventilation tube is connected to the top of the front cover shell. At this time, the air drawn into the front cover shell is introduced into the ventilation main pipe connected to the top of the ceiling vent outer frame through the ventilation tube and discharged to the outdoors; when the test of releasing harmful gases is carried out in the laboratory, by removing the front covers on several walls, the combination is placed on the test table, the top of the front cover shell is connected by a rotating flip joint, and then the lifting device is started to drive the metal strip to drive the ventilation socket to descend, and then the ventilation plug is inserted and installed in the ventilation socket, and the lifting device is started again to drive the metal strip to drive the ventilation socket to descend, and then the ventilation plug is inserted and installed in the ventilation socket, and the lifting device is started again to drive the metal strip to drive the ventilation socket to descend, and then the ventilation plug is inserted and installed in the ventilation socket. The metal strip drives the ventilation socket to a high place and connects with the outer frame of the ceiling vent. At this time, the air drawn in by the front cover is introduced into the ventilation main pipe connected to the top of the outer frame of the ceiling vent through the flip joint, bellows and ventilation plug and discharged to the outside; so as to improve the flexibility of the installation position of the air inlet in the ventilation system and make dynamic adjustments according to the actual needs of the laboratory at any time, which can effectively alleviate the problem of energy waste or insufficient ventilation in certain areas; and the movable front cover air inlet can be quickly adjusted according to different experimental needs. The configuration will not occupy too much operating space for the experimenter, ensuring the convenience of experimental operation; finally, the ventilation system with flexible adjustment of the air inlet position greatly reduces the cost, and can achieve reduced installation without losing various ventilation functions, ensuring the safety, comfort and work efficiency of low-level laboratories. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A usage scenario diagram of a laboratory circulation ventilation system provided by the present invention; Figure 2 A schematic diagram of the descent of a lifting device of a laboratory circulation ventilation system provided by the present invention; Figure 3 A schematic diagram of the front cover structure of a laboratory circulation ventilation system provided by the present invention; Figure 4 A cross-sectional view of a front cover of a laboratory circulation ventilation system provided by the present invention; Figure 5 A schematic diagram of extracting a filter plate of a laboratory circulating ventilation system provided by the present invention; Figure 6 A side cross-sectional view of a ventilation system of a laboratory circulation ventilation system provided by the present invention; Figure 7 A schematic diagram of a flip joint of a laboratory circulating ventilation system provided by the present invention; Figure 8A schematic diagram of the internal structure of a rear housing of a laboratory circulation ventilation system provided by the present invention; Fig. 9 An exploded view of the internal structure of a rear cover of a laboratory circulation ventilation system provided by the present invention; Fig.10 A schematic diagram of the wall-mounted structure plug-in connection of a laboratory circulation ventilation system provided by the present invention; Fig.11 A schematic diagram of the outer frame structure of a ceiling vent of a laboratory circulation ventilation system provided by the present invention; Fig.12 A schematic diagram of the structure of a lifting device for a laboratory circulation ventilation system provided by the present invention; Fig.13 A bottom view of a ceiling vent outer frame of a laboratory circulation ventilation system provided by the present invention; Fig.14 A cross-sectional view of an outer frame of a ceiling vent of a laboratory circulation ventilation system provided by the present invention; Fig.15 A schematic diagram of the folding of a lifting device of a laboratory circulation ventilation system provided by the present invention; Fig.16 A schematic diagram of the internal structure of an upper orbital cabin of a laboratory circulation ventilation system provided by the present invention; Fig.17 A schematic diagram of the sliding connection of an upper slider of a laboratory circulation ventilation system provided by the present invention; Fig.18 A schematic diagram of the sliding connection of a lower slider of a laboratory circulating ventilation system provided by the present invention.

[0015] In the figure: front cover 11, air inlet 12, ventilation interface 13, side panel 14, filter plate 15, air suction disc 16, motor 17, exhaust fan 18, rear cover 21, hanging buckle 22, flip joint 23, bellows 24, buckle 25, ventilation plug 26, hanging seat 27, ventilation small tube 28, telescopic hose 29, ventilation joint 30, ceiling vent frame 31, air guide plate 32, strip opening 33, small tube interface 34, metal strip 35, ventilation socket 36, ventilation main pipe 37, upper track module 41, upper slider 42, gear plate 43, gear 44, motor 45, first lifting link 46, second lifting link 47, third lifting link 48, lower slider 49, lower track module 50. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0017] Embodiment 1, as Figure 1 - Figure 3 , Figure 8 , Fig.11 - Fig.14 As shown, a circulating ventilation system for a laboratory in an embodiment of the first aspect of the present invention comprises a front cover shell 11 and a ceiling vent outer frame 31, the ceiling vent outer frame 31 is fixedly mounted on the ceiling suspended ceiling board of the laboratory, a ventilation pipe 37 is fixedly mounted on the top surface of the ceiling vent outer frame 31, the ventilation pipe 37 extends to the outside of the laboratory at one end away from the ceiling vent outer frame 31, a rear cover shell 21 is fixedly mounted on one side of the front cover shell 11, a wall-mounted structure is fixedly mounted on the side of the rear cover shell 21 away from the front cover shell 11, the wall-mounted structure is used to hang the rear cover shell 21 on the laboratory wall, a ventilation duct 28 is fixedly mounted on the laboratory wall above the rear cover shell 21, a plurality of small duct interfaces 34 are fixedly mounted on two parallel sides of the ceiling vent outer frame 31, and the upper ends of all the ventilation ducts 28 extend upward to the ceiling and are fixed Different small tube interfaces 34 are connected, and the lower end of the ventilation small tube 28 is used to connect to the top of the front cover shell 11 suspended on the wall. A ventilation system is installed on the inner wall of the front cover shell 11, and the ventilation system is used to draw external air into the front cover shell 11. A bellows 24 is arranged in the rear cover shell 21, and a flip joint 23 is fixedly installed at one end of the bellows 24. The flip joint 23 is used to flip and connect to the top of the front cover shell 11, and a ventilation plug 26 is fixedly installed at the other end of the bellows 24. A metal strip 35 is arranged below the two sides of the ceiling vent outer frame 31 perpendicular to the small tube interface 34, and a plurality of ventilation sockets 36 are installed on the metal strip 35. The ventilation plug 26 is used to be inserted into the ventilation socket 36 and connected to the ceiling vent outer frame 31. A lifting device is installed on the ceiling vent outer frame 31 perpendicular to the two sides of the small tube interface 34, and the lifting device is used to drive the metal strip 35 to rise or fall.

[0018] In the above embodiment, it should be noted that the wall-mounted structure can realize the detachable wall-mounting of the rear cover 21, and the bellows 24 and the ventilation plug 26 can be folded and stored inside the rear cover 21 by rotating the flip joint 23. The ventilation duct 28 can be installed on the surface of the ceiling and the wall, or can be pre-buried in the wall. The ventilation duct 28 is a fixed structure, and the inner diameter of the ventilation socket 36 is equal to the outer diameter of the ventilation plug 26. The ventilation socket 36 and the ventilation plug 26 are both made of plastic material. When the ventilation plug 26 is inserted into the ventilation socket 36, there is sealing between the ventilation plug 26 and the ventilation socket 36; the ventilation main pipe 37 is a pipe for exchanging air with the outside world, and an air supply device is installed in the ventilation main pipe 37. The ventilation main pipe 37 can not only discharge the internal air of the laboratory input into the ceiling vent outer frame 31, but also can, when there is no need to discharge harmful gases, input the external air into the laboratory through the ceiling vent outer frame 31 through the reverse output of the air supply device to realize the exchange of internal and external air; By starting the ventilation system, the air in the laboratory can be drawn into the front cover shell 11; when no test of releasing harmful gases is conducted in the laboratory, multiple rear covers 21 and the front cover shell 11 are hung and fixed around the walls of the laboratory through a wall-mounted structure, and then the lower end of the ventilation tube 28 is connected to the top of the front cover shell 11. At this time, the air drawn into the front cover shell 11 is introduced into the ceiling vent outer frame 31 through the ventilation tube 28, and then discharged to the outdoors through the ventilation main pipe 37; when the test of releasing harmful gases is conducted in the laboratory, a certain number of rear covers 21 and front covers 11 on the wall are removed, the combination is placed on the test table, and then the flip joint 23 is rotated to connect to the top of the front cover shell 11, and then the lifting device is started to drive the metal strip 35 to drive the ventilation socket 36 to descend to the vicinity of the table, and then the ventilation plug 26 is inserted and installed in the ventilation socket 36, and the lifting device is started again to drive the metal strip 35 The ventilation socket 36 is driven to rise to a high place and connected with the ceiling vent outer frame 31. At this time, the air drawn in by the front cover is introduced into the ceiling vent outer frame 31 through the flip joint 23, the bellows 24 and the ventilation plug 26, and then discharged to the outside through the ventilation main pipe 37; so as to improve the flexibility of the installation position of the air inlet in the ventilation system, and dynamically adjust it according to the actual needs of the laboratory at any time, which can effectively alleviate the problem of energy waste or insufficient ventilation in certain areas; and the movable front cover air inlet can be quickly adjusted according to different experimental needs. The configuration will not occupy too much operating space for the experimenter, ensuring the convenience of experimental operation; finally, the ventilation system with flexible adjustment of the air inlet position greatly reduces the cost, and can achieve reduced installation without losing various ventilation functions, ensuring the safety, comfort and work efficiency of low-level laboratories.

[0019] Embodiment 2, as Figure 3 - Figure 7 As shown, a circulating ventilation system for a laboratory includes embodiment 1. In addition, a side of the front cover shell 11 close to the rear cover shell 21 is set as an opening, and a side of the front cover shell 11 away from the rear cover shell 21 is provided with a plurality of air inlet holes 12, and the air inlet holes 12 are arranged radially. A slot is provided on one side of the front cover shell 11, and a side plate 14 is inserted and installed at the slot of the front cover shell 11. A semicircular groove is provided on the surface of the side plate 14. A ventilation interface 13 is fixedly installed on the top surface of the front cover shell 11. The ventilation system includes an air suction plate 16, and the air suction plate 16 is fixedly installed on the front cover The inner wall of the shell 11 is provided with an air inlet hole 12, and a plurality of fan-shaped openings are provided on the side of the air suction plate 16 away from the front cover shell 11. A motor 17 is fixedly installed on the inner wall of the side of the air suction plate 16 away from the front cover shell 11, and an exhaust fan 18 is fixedly installed on the output end of the motor 17 close to the front cover shell 11. A filter plate 15 is fixedly bonded to the side of the side plate 14 away from the semicircular groove. The filter plate 15 can be inserted into the front cover shell 11 from the side groove of the front cover shell 11 and installed inside the front cover shell 11. The filter plate 15 is close to the surface of the side of the air suction plate 16 away from the front cover shell 11.

[0020] In the above embodiment, it should be noted that the ventilation interface 13 is made of rubber material, the air suction plate 16 divides the interior of the front cover shell 11 into two parts, and the exhaust fan 18 is driven to rotate by starting the motor 17 to achieve the effect of drawing the air in front of the front cover shell 11 into the air suction plate 16 through the air inlet hole 12. The air entering the air suction plate 16 can only enter the outer area of ​​the air suction plate 16 after being filtered by the filter plate 15. The semicircular groove on the surface of the side panel 14 can facilitate the staff to pull out the side panel 14. By pulling the side panel 14, the filter plate 15 is driven to slide in the groove on the side of the front cover shell 11 to achieve the effect of pulling out or inserting the filter plate 15, so as to facilitate regular replacement of the filter plate 15.

[0021] Embodiment 3, as Figure 3 and Figure 7 - Fig.10 As shown, a circulating ventilation system for a laboratory includes embodiment 2. In addition, a ventilation duct 28 is embedded and installed on the surface or inside of the laboratory wall and ceiling, a telescopic hose 29 is fixedly installed at the lower end of the ventilation duct 28, and a ventilation joint 30 is fixedly installed at one end of the telescopic hose 29 away from the ventilation duct 28. The ventilation joint 30 can be inserted and installed in the top opening of the ventilation interface 13. The top surface of the rear cover 21 is provided with a square groove, and the flip joint 23 is rotatably installed in the square groove on the top surface of the rear cover 21. The flip joint 23 can be flipped The rear cover shell 21 comes out of the square groove on the top surface and is inserted into the opening on the top surface of the ventilation interface 13. The side of the rear cover shell 21 away from the front cover shell 11 is set as an opening. A plurality of buckles 25 are fixedly installed on the inner wall of the rear cover shell 21. The bellows 24 is fixed on the buckles 25 by snap connection. The wall-mounted structure includes a mounting seat 27. Bolts are inserted and installed on both sides of the mounting seat 27. The bolts are used to fix the mounting seat 27 on the walls around the laboratory. Buckles 22 are fixedly installed at the two corners above the inner wall of the rear cover shell 21. The buckles 22 can be inserted and connected to the mounting seat 27.

[0022] In the above embodiment, it should be noted that the telescopic hose 29 is used to adjust the length between the ventilation joint 30 and the ventilation tube 28 so as to better insert the ventilation interface 13. The ventilation joint 30 is made of rubber material and has good sealing performance with the ventilation interface 13 which is also made of rubber material. The flip joint 23 is also made of rubber material and has good sealing performance with the ventilation interface 13 which is also made of rubber material. The bellows 24 is folded and fixedly installed in the rear cover 21 through the buckle 25. The present invention provides two communication modes of the front cover 11: when no test of releasing harmful gas is conducted in the laboratory, the hook 22 on the inner wall of the rear cover 21 is inserted from above and installed on the hanger 27, and then the ventilation joint 30 at the lower end of the telescopic hose 29 is pulled and inserted into the ventilation interface 13 at the top of the front cover 11, so as to achieve the effect of connecting the front cover 11 with the ventilation duct 28, and at this time, the air in the front cover 11 flows into the ceiling ventilation opening outer frame 31 through the ventilation duct 28; When conducting a test of releasing harmful gases in the laboratory, the rear cover shell 21 is lifted up to disengage the hook 22 from the hanger 27. After the front cover shell 11 and the rear cover shell 21 are disassembled, they are placed on the test bench according to the actual needs of the laboratory. Then, the flip joint 23 is turned over and inserted into the ventilation interface 13 on the top of the front cover shell 11. At the same time, the flip joint 23 drives the bellows 24 and the ventilation plug 26 to turn out of the rear cover shell 21 to achieve the effect of connecting the front cover shell 11 and the bellows 24. Finally, the ventilation plug 26 is inserted into the ventilation socket 36. At this time, the air in the front cover shell 11 flows into the ceiling vent outer frame 31 through the bellows 24. Embodiment 4, as Fig.11 - Fig.18As shown, a circulating ventilation system for a laboratory includes embodiment 3. In addition, a plurality of air guide plates 32 are arranged on the inner wall of the ceiling vent outer frame 31, and annular protrusions are arranged at both upper and lower ends of the outer wall of the ceiling vent outer frame 31. The annular protrusions on the outer wall of the ceiling vent outer frame 31 are used to fix the ceiling vent outer frame 31 in the square opening reserved in the ceiling ceiling plate. The annular protrusion surface at the lower end of the outer wall of the ceiling vent outer frame 31 is provided with a strip opening 33, and the strip opening 33 is arranged on the ceiling vent outer frame 31. The air outlet frame 31 is perpendicular to the two sides of the small tube interface 34. The lifting device includes an upper track cabin 41, which is fixedly mounted on the annular raised bottom surface of the upper end of the outer wall of the ceiling vent frame 31 above the strip opening 33. A lower track cabin 50 is arranged directly below the upper track cabin 41. A pair of upper sliders 42 are slidably mounted on the bottom surface of the upper track cabin 41, and a pair of lower sliders 49 are slidably mounted on the top surface of the lower track cabin 50. The two ends of the lower track cabin 50 are fixedly connected to the two ends of the metal strip 35. The two lower track cabins 50 are connected to the two metal strips 35. The strip 35 forms a rectangular frame structure, the end of the upper slider 42 away from the upper rail cabin 41 is rotatably mounted with a first lifting link 46, the middle parts of the two first lifting links 46 are rotatably connected to each other, the end of the first lifting link 46 away from the upper slider 42 is rotatably mounted with a second lifting link 47, the middle parts of the two second lifting links 47 are rotatably connected to each other, the end of the second lifting link 47 away from the first lifting link 46 is rotatably mounted with a third lifting link 48, the middle parts of the two third lifting links 48 are rotatably connected to each other The ends of the two third lifting links 48 away from the second lifting links 47 are rotatably connected to the two lower sliders 49 respectively. A tooth plate 43 is fixedly installed on the top surface of the inner wall of the upper track module 41, and a tooth groove is arranged on the bottom surface of the tooth plate 43. A gear 44 is rotatably installed on the top surface of the upper slider 42. The top surface of the gear 44 is meshed with the tooth groove of the bottom surface of the tooth plate 43. A strip slit is arranged on one side of the outer wall of the upper track module 41. The rotating shaft at one end of the gear 44 extends from the strip slit of the upper track module 41 to the outside of the upper track module 41 and is fixedly connected to the motor 45.

[0023] In the above embodiment, it should be noted that by starting the motor 45 on a pair of upper sliders 42 in the lower track cabin 50, the driving gear 44 rotates and meshes with the tooth plate 43, driving the pair of upper sliders 42 to slide close to each other, and the upper sliders 42 approach to drive the two first lifting links 46 to retract inward, drive the two second lifting links 47 to retract inward, drive the two third lifting links 48 to retract inward, drive the lower sliders 49 to slide close to each other in the lower track cabin 50, and finally push the lower track cabin 50 downward to achieve the effect of driving the metal strip 35 to descend; when the ventilation plug 26 is inserted into the ventilation plug After the seat 36 is moved, by starting the motor 45 on a pair of upper sliders 42 in the lower track cabin 50, the driving gear 44 rotates and meshes with the tooth plate 43, driving the pair of upper sliders 42 to slide away from each other, and the upper sliders 42 move away from each other to drive the two first lifting links 46 to deflect outward, drive the two second lifting links 47 to deflect outward, drive the two third lifting links 48 to deflect outward, drive the lower sliders 49 to slide away from each other in the lower track cabin 50, and finally push the lower track cabin 50 to move upward into the strip opening 33, so as to achieve the effect of driving the metal strip 35 to rise to the bottom surface of the ceiling vent outer frame 31.

[0024] The use process of the present invention is as follows: When a person skilled in the art does not conduct a test for releasing harmful gases in a laboratory, he or she inserts the hook 22 on the inner wall of the rear cover 21 from above and installs it on the hanger 27, then pulls the ventilation joint 30 at the lower end of the telescopic hose 29 and inserts it into the ventilation interface 13 at the top of the front cover 11, starts the motor 17 to drive the exhaust fan 18 to rotate, and draws the air in front of the front cover 11 into the suction plate 16 through the air inlet 12, and after being filtered by the filter plate 15, flows into the ceiling vent outer frame 31 through the ventilation duct 28, and then is discharged to the outside through the ventilation main pipe 37; when a test for releasing harmful gases in the laboratory is performed, the air in the front cover 11 is sucked into the air suction plate 16 through the air inlet 12, and then ...37, and then is When testing the release of harmful gases, the rear cover 21 is lifted up to disengage the hook 22 from the hanger 27. After the front cover 11 and the rear cover 21 are disassembled, they are placed on the test bench according to the actual needs in the laboratory. Then, the flip joint 23 is turned over and inserted into the ventilation interface 13 on the top of the front cover 11. At the same time, the flip joint 23 drives the bellows 24 and the ventilation plug 26 to turn out of the rear cover 21. Then, the motor 45 on the pair of upper sliders 42 in the lower orbital cabin 50 is started, and the drive gear 44 rotates and meshes with the tooth plate 43, driving the pair of upper sliders 42 to slide closer to each other. The upper sliders 42 approach and drive the two first lifts The lowering link 46 contracts inwards, driving the two second lifting links 47 to contract inwards, driving the two third lifting links 48 to contract inwards, driving the lower sliders 49 to slide closer to each other in the lower track cabin 50, and finally pushing the lower track cabin 50 downwards to drive the metal strip 35 and the ventilation socket 36 to descend, inserting the ventilation plug 26 into the ventilation socket 36, and starting the motor 45 on the pair of upper sliders 42 in the lower track cabin 50 again, driving the gear 44 to rotate and mesh with the gear plate 43, driving the pair of upper sliders 42 to slide away from each other, and the upper sliders 42 move away and drive the two first lifting links 46 to deflect outwards, driving the two third lifting links 48 to move away from each other. The second lifting link 47 deflects outward, driving the two third lifting links 48 to deflect outward, driving the lower slider 49 to slide away from each other in the lower track cabin 50, and finally pushing the lower track cabin 50 to move upward into the strip opening 33, while driving the metal strip 35 and the ventilation socket 36 to rise to the bottom surface of the ceiling vent outer frame 31. At this time, the motor 17 is started to drive the exhaust fan 18 to rotate, and the gas generated by the test in front of the front cover shell 11 is drawn into the suction plate 16 through the air inlet hole 12, and after being filtered by the filter plate 15, it flows into the ceiling vent outer frame 31 through the bellows 24, and then is discharged to the outside through the ventilation main pipe 37.

[0025] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A circulating ventilation system for a laboratory, comprising a front cover (11) and a ceiling vent outer frame (31), wherein the ceiling vent outer frame (31) is fixedly mounted on a ceiling plate of the laboratory, a ventilation main pipe (37) is fixedly mounted on the top surface of the ceiling vent outer frame (31), and one end of the ventilation main pipe (37) away from the ceiling vent outer frame (31) extends to the outside of the laboratory, characterized in that: A rear cover (21) is fixedly mounted on one side of the front cover (11), and a wall-mounted structure is fixedly mounted on a side of the rear cover (21) away from the front cover (11), and the wall-mounted structure is used to suspend and fix the rear cover (21) on the laboratory wall. A ventilation duct (28) is fixedly mounted on the laboratory wall above the rear cover (21), and a plurality of small tube interfaces (34) are fixedly mounted on two parallel sides of the ceiling vent outer frame (31). The upper ends of all the ventilation ducts (28) extend upward to the ceiling and are fixedly connected to different small tube interfaces (34). The lower ends of the ventilation ducts (28) are used to communicate with the top of the front cover (11) hung on the wall. A ventilation system is installed on the inner wall of the front cover (11), and the ventilation system is used to draw external air into the front cover. (11), a bellows (24) is arranged in the rear cover (21), one end of the bellows (24) is fixedly installed with a flip joint (23), the flip joint (23) is used to flip and connect to the top of the front cover (11), the other end of the bellows (24) is fixedly installed with a ventilation plug (26), the ceiling vent outer frame (31) is perpendicular to the small tube interface (34) and is provided with metal strips (35) below both sides, the metal strip (35) is installed with a plurality of ventilation sockets (36), the ventilation plug (26) is used to be inserted into the ventilation sockets (36) and connect to the ceiling vent outer frame (31), the ceiling vent outer frame (31) is perpendicular to the small tube interface (34) and is installed with a lifting device, the lifting device is used to drive the metal strip (35) to rise or fall.

2. A laboratory circulation ventilation system according to claim 1, characterized in that: The side of the front cover shell (11) close to the rear cover shell (21) is set as an opening, and the side of the front cover shell (11) away from the rear cover shell (21) is provided with a plurality of air inlet holes (12), and the air inlet holes (12) are arranged radially. A groove is provided on one side of the front cover shell (11), and a side plate (14) is inserted and installed at the groove of the front cover shell (11). The surface of the side plate (14) is provided with a semicircular groove, and a ventilation interface (13) is fixedly installed on the top surface of the front cover shell (11).

3. A laboratory circulation ventilation system according to claim 2, characterized in that: The ventilation system comprises an air suction plate (16), wherein the air suction plate (16) is fixedly mounted on a portion of the inner wall of the front cover shell (11) where an air inlet hole (12) is provided, and a plurality of fan-shaped openings are provided on a side of the air suction plate (16) away from the front cover shell (11), and a motor (17) is fixedly mounted on the inner wall of the side of the air suction plate (16) away from the front cover shell (11), and an exhaust fan (18) is fixedly mounted on an output end of the motor (17) close to the front cover shell (11), and a filter plate (15) is fixedly bonded to a side of the side plate (14) away from the semicircular groove, and the filter plate (15) can be inserted from a side slot of the front cover shell (11) and installed inside the front cover shell (11), and the filter plate (15) is closely attached to a surface of the side of the air suction plate (16) away from the front cover shell (11).

4. A laboratory circulation ventilation system according to claim 2, characterized in that: The ventilation duct (28) is embedded in or installed on the surface or inside of the laboratory wall and ceiling. A telescopic hose (29) is fixedly installed at the lower end of the ventilation duct (28). A ventilation joint (30) is fixedly installed at one end of the telescopic hose (29) away from the ventilation duct (28). The ventilation joint (30) can be inserted and installed in the top opening of the ventilation interface (13).

5. A laboratory circulation ventilation system according to claim 2, characterized in that: The top surface of the rear cover shell (21) is provided with a square groove, and the flip joint (23) is rotatably installed in the square groove on the top surface of the rear cover shell (21). The flip joint (23) can be flipped out of the square groove on the top surface of the rear cover shell (21) and inserted into the top surface opening of the ventilation interface (13). The side of the rear cover shell (21) away from the front cover shell (11) is set as an opening, and a plurality of clips (25) are fixedly installed on the inner wall of the rear cover shell (21), and the bellows (24) is fixed on the clips (25) by clipping.

6. A laboratory circulation ventilation system according to claim 5, characterized in that: The wall-mounted structure comprises a mounting seat (27), bolts are inserted and installed on both sides of the mounting seat (27), and the bolts are used to fix the mounting seat (27) on the walls around the laboratory. Hanging buckles (22) are fixedly installed at two corners above the inner wall of the rear cover (21), and the hanging buckles (22) can be inserted and connected to the mounting seat (27).

7. A laboratory circulation ventilation system according to claim 1, characterized in that: A plurality of air guide plates (32) are arranged and installed on the inner wall of the ceiling vent outer frame (31); annular protrusions are arranged at both upper and lower ends of the outer wall of the ceiling vent outer frame (31); the annular protrusions on the outer wall of the ceiling vent outer frame (31) are used to fix the ceiling vent outer frame (31) in a square opening reserved in a ceiling suspended ceiling plate; a strip opening (33) is arranged on the surface of the annular protrusion at the lower end of the outer wall of the ceiling vent outer frame (31); the strip opening (33) is arranged on both sides of the ceiling vent outer frame (31) perpendicular to the small tube interface (34).

8. A laboratory circulation ventilation system according to claim 7, characterized in that: The lifting device comprises an upper track cabin (41), the upper track cabin (41) being fixedly mounted on the annular raised bottom surface at the upper end of the outer wall of the ceiling vent outer frame (31) above the strip opening (33), a lower track cabin (50) being arranged directly below the upper track cabin (41), a pair of upper sliders (42) being slidably mounted on the bottom surface of the upper track cabin (41), a pair of lower sliders (49) being slidably mounted on the top surface of the lower track cabin (50), two ends of the lower track cabin (50) being fixedly connected to two ends of the metal strip (35), and two lower track cabins (50) and two metal strips (35) forming a rectangular frame structure.

9. A laboratory circulation ventilation system according to claim 8, characterized in that: The ends of the upper slider (42) away from the upper orbital cabin (41) are rotatably mounted with a first lifting link (46), the middle parts of the two first lifting links (46) are rotatably connected to each other, the ends of the first lifting links (46) away from the upper slider (42) are rotatably mounted with a second lifting link (47), the middle parts of the two second lifting links (47) are rotatably connected to each other, the ends of the second lifting links (47) away from the first lifting link (46) are rotatably mounted with a third lifting link (48), the middle parts of the two third lifting links (48) are rotatably connected to each other, and the ends of the two third lifting links (48) away from the second lifting links (47) are rotatably connected to the two lower sliders (49) respectively.

10. A laboratory circulation ventilation system according to claim 9, characterized in that: A toothed plate (43) is fixedly mounted on the top surface of the inner wall of the upper track cabin (41), and a toothed groove is arranged on the bottom surface of the toothed plate (43). A gear (44) is rotatably mounted on the top surface of the upper slider (42), and the top surface of the gear (44) is meshedly connected with the toothed groove of the bottom surface of the toothed plate (43). A strip-shaped slit is arranged on one side of the outer wall of the upper track cabin (41), and a rotating shaft at one end of the gear (44) extends from the strip-shaped slit of the upper track cabin (41) to the outside of the upper track cabin (41) and is fixedly connected to a motor (45).

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