Experimental operating table ventilation device and method thereof

Abstract

The present invention discloses a ventilation device for an experimental operating table and a method thereof, which relate to the field of ventilation technology, and include a bottom frame, a ventilated hollow operating table installed at the top of the bottom frame, C-shaped columns fixed at two corner positions of the top of the bottom frame on one side of the ventilated hollow operating table, and a support frame slidably installed between the two C-shaped columns, wherein a Z-axis screw lifting module for driving the support frame to perform Z-axis lifting is installed on the outer wall of one side of the C-shaped columns, and a dual-zone negative pressure suction assembly is installed at the bottom end of the bottom frame. The present invention centralizes the high-resistance filtering link in the front and is undertaken by the dual-zone negative pressure suction assembly, freeing up the subsequent left and right centrifugal gear blast assemblies, so that the symmetrically arranged centrifugal blast assembly can fully utilize the low resistance characteristic of purified air transmission, realize strong, uniform, and controllable two-way or multi-point air supply, and create a uniformly distributed, fully mixed and clean airflow environment near the operating table.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation, in particular to a ventilation device for an experimental operating table and a method thereof. Background Art

[0002] The main function of the ventilation device used in the laboratory operating table is to promptly and effectively remove harmful gases, vapors and dust generated during the experiment to ensure the health and safety of the operators; the device consists of a ventilation hood, exhaust ducts, fans and filtration systems. The ventilation hood covers the experimental area, has a reasonable shape, and is made of corrosion-resistant materials, aiming to capture harmful substances to the greatest extent. The fan generates negative pressure to extract the gas from the hood, and flows it along the exhaust duct to the filter device. The filtration system is responsible for purifying the exhausted air, removing harmful components before discharging it outdoors or recycling it. The entire ventilation process relies on the power of the fan to quickly extract harmful gases, forming a locally enclosed environment, preventing harmful substances from spreading to other areas of the laboratory, and ensuring fresh and safe air.

[0003] For example, a laboratory operating table ventilation device disclosed in the authorization announcement number CN218079540U includes a ventilation duct, suction ports are provided at both ends of the ventilation duct, an air outlet is extended at the center of the ventilation duct, and filtering structures are provided in both ends of the ventilation duct. A symmetrically distributed placement slot is opened on one side of the ventilation duct, a box door is hingedly provided on the placement slot, a handle is provided on the box door, and a hinge is hinged at the connection between the box door and the placement slot. The suction fan, the filter frame, the suction port and the ventilation duct are arranged in coordination, so that the suction fan draws the experimental gas from the suction port into the ventilation duct, so that the gas passes through the filter holes in the filter frame to remove the particles in the air. Secondary filtration is performed to prevent particles from directly clogging subsequent filter elements. However, during use, the above technical solution mainly sets a filtering structure in the air inlet section of the suction fan to achieve the purpose of ventilation and air purification. When the air passes through these filter materials, it must overcome the pore resistance of the filter materials, which means that the air flow is restricted, resulting in the airflow entering the fan becoming more difficult. Especially in the case of a thicker filter layer or a higher filter material density, the resistance will increase significantly. The high resistance forces the fan to operate in an inefficient area of ​​low air volume and high static pressure for a long time, which is inefficient and prone to overheating. Under extremely high resistance, the fan may also enter an unstable working area, generating violent vibration and noise, and seriously damaging core components such as bearings and blades. Summary of the Invention

[0004] The purpose of the present invention is to provide a laboratory workbench ventilation device and method thereof, which utilizes a dual-zone negative pressure suction assembly to continuously suck air in a ventilated hollow workbench. The air is sucked and filtered by the dual-zone negative pressure suction assembly and then sent to the right centrifugal gear blower assembly and the left centrifugal gear blower assembly respectively by a three-way pipe and a connecting pipe. The rotary drive assembly provides power to the right centrifugal gear blower assembly and the left centrifugal gear blower assembly, prompting the left and right blower assemblies to work and blow the purified air back to the ventilated hollow workbench to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ventilation device for an experimental operating table, comprising a bottom frame, a ventilated hollow operating table installed on the top of the bottom frame, C-mouth columns fixed at two corner positions of the top of the bottom frame on one side of the ventilated hollow operating table, and a support frame slidably installed between the two C-mouth columns, wherein a Z-axis screw lifting module for driving the support frame to perform Z-axis lifting is installed on the outer wall of one side of the C-mouth columns, a dual-zone negative pressure suction assembly is installed at the bottom end of the bottom frame, and the air inlet of the dual-zone negative pressure suction assembly extends to the interior of the ventilated hollow operating table, and left centrifugal gear blasts are respectively installed on the left and right inner walls of the support frame. Assembly, right centrifugal gear blast assembly, a tee pipe is installed between the right centrifugal gear blast assembly and the left centrifugal gear blast assembly, one end of the tee pipe is installed with a connecting pipe interconnected with the air outlet of the dual-zone negative pressure suction assembly, a rotary drive assembly for driving the right centrifugal gear blast assembly is installed on the outer wall of one side of the support frame, a transmission shaft for maintaining power connection is also installed between the right centrifugal gear blast assembly and the left centrifugal gear blast assembly, a PLC control panel electrically connected to the Z-axis screw lifting module, the rotary drive assembly, and the input end of the dual-zone negative pressure suction assembly is installed on the outer wall of one side of the ventilated hollow operating table.

[0006] Preferably, the support frame consists of a triangular side plate slidably mounted on the inner wall of the C-mouth column and a horizontal column mounted on the outer walls of the opposite sides of the two triangular side plates, and the movable end of the Z-axis screw lifting module is fixedly connected to the outer wall of one side of the triangular side plates.

[0007] Preferably, the upper surface of the ventilated hollow operating table is provided with through holes.

[0008] Preferably, the dual-zone negative pressure suction assembly includes L-shaped air inlet pipes installed on both sides of the bottom end of the ventilated hollow operating table, a horizontal pipe installed between the two L-shaped air inlet pipes, and a first switch valve installed at one end of one of the L-shaped air inlet pipes, a Z-shaped tube is installed on the outer wall of one side of one of the L-shaped air inlet pipes, a vacuum pump is installed on one side of the top of the bottom frame, a filter is installed at the air inlet of the vacuum pump, and the air inlet of the filter and one end of the Z-shaped tube are connected to each other.

[0009] Preferably, the air outlet of the vacuum pump is equipped with a bellows expansion pipe extending vertically upward, and one end of the bellows expansion pipe away from the vacuum pump is connected to one end of the connecting pipe.

[0010] Preferably, the rotary drive assembly includes a motor installed on the outer wall of one side of another triangular side plate, a main shaft installed at the lower end of the motor drive shaft through a cross universal joint, and an axle-carrying frame fixed on the outer wall of one side of another triangular side plate. The lower end of the main shaft extends to the interior of the axle-carrying frame and is installed with a bevel gear right-angle transmission structure for driving the right centrifugal gear blower assembly to work.

[0011] Preferably, the right centrifugal gear blower assembly and the left centrifugal gear blower assembly have the same structural composition, and the right centrifugal gear blower assembly includes a centrifugal fan fixed on the outer wall of one side of another triangular side plate, an air intake disc installed on the outer wall of the air inlet side of the centrifugal fan, and a second switch valve installed on the outer wall of one side of the air intake disc, one end of the second switch valve is interconnected with one end of the three-way pipe, and a final stage gear disc is installed on the input shaft of the centrifugal fan, and the input shaft of the centrifugal fan is powered by a bevel gear right-angle transmission structure, and a secondary gear shaft is rotatably installed on the outer wall of the triangular side plate on one side of the final stage gear disc, the secondary gear shaft and the final stage gear disc are meshed with each other, and a first stage gear shaft is fixed at both ends of the transmission shaft surface, and the first stage gear shaft and the second stage gear shaft are meshed with each other.

[0012] Preferably, a cavity is provided inside the air intake disc head, and a longitudinal column cavity for connecting the cavity and the second switch valve is provided on the other side of the air intake disc head. The bevel gear right-angle transmission structure includes a driven bevel gear installed on the input shaft of the centrifugal fan and a driving bevel gear installed at the lower end of the main shaft, and the driven bevel gear and the driving bevel gear are engaged with each other.

[0013] Preferably, an air duct is installed at the lower end of the air outlet of the right centrifugal gear blower assembly and the left centrifugal gear blower assembly.

[0014] The present invention also provides a ventilation method for an experimental workbench, such as the experimental workbench ventilation device described above, comprising the following steps:

[0015] S101: The Z-axis screw lifting module is controlled by the PLC control panel to operate, and the Z-axis screw lifting module is used to drive the support frame, rotary drive assembly, right centrifugal gear blast assembly, transmission shaft, left centrifugal gear blast assembly, tee pipe, and connecting pipe to move up and down in the vertical direction to change the operating height of the right centrifugal gear blast assembly and the left centrifugal gear blast assembly;

[0016] S102: After the operating height adjustment of the right centrifugal gear blast assembly and the left centrifugal gear blast assembly is completed, the rotary drive assembly and the dual-zone negative pressure suction assembly are started through the PLC control panel. A stable negative pressure field is formed at the air inlet of the dual-zone negative pressure suction assembly. The negative pressure field strongly absorbs the air inside the operating table. Driven by the negative pressure, the air is concentrated into the internal air duct of the dual-zone negative pressure suction assembly and filtered.

[0017] S103: The purified air is collected at the air outlet of the dual-zone negative pressure suction assembly and evenly divided into two airflows through the connecting pipe and the tee pipe. The two purified airflows enter the air inlets of the right centrifugal gear blower assembly and the left centrifugal gear blower assembly. The rotary drive assembly transmits power to the right centrifugal gear blower assembly and the left centrifugal gear blower assembly synchronously and reliably through the transmission shaft, ensuring that the speeds of the two are coordinated. The powered left and right blower assemblies rotate at high speed, and the centrifugal impeller accelerates the clean air to be ejected, converting it into high-pressure airflow in the volute, significantly increasing the kinetic energy and pressure of the air.

[0018] S104: The right centrifugal gear blower assembly and the left centrifugal gear blower assembly spray air into the operating position through their respective air outlets from symmetrical positions on both sides of the ventilated hollow operating table. The airflows on both sides intersect and merge in the center of the work area, completely eliminating single-point air supply blind spots and achieving full coverage of the operating area.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the experimental operating table ventilation device and method thereof are provided with a ventilation hollow operating table, a double-zone negative pressure suction assembly, a three-way pipe, a connecting pipe, a right centrifugal gear blast assembly, a left centrifugal gear blast assembly and a transmission shaft and other structures that cooperate with each other, and the double-zone negative pressure suction assembly is used to continuously suck air in the ventilation hollow operating table, and the air is sucked and filtered by the double-zone negative pressure suction assembly and then sent to the right centrifugal gear blast assembly and the left centrifugal gear blast assembly by the three-way pipe and the connecting pipe respectively, and the rotating drive The dynamic assembly provides power to the right centrifugal gear blast assembly and the left centrifugal gear blast assembly, prompting the left and right blast assemblies to work, so that the purified air is blown back to the ventilated hollow operating table. The high-resistance filtration link is centralized in the front and is taken over by the dual-zone negative pressure suction assembly, freeing up the subsequent left and right centrifugal gear blast assemblies. The symmetrically arranged centrifugal blast assemblies fully utilize the low resistance of purified air transmission, achieving strong, uniform, and controllable two-way or multi-point air supply, and creating a uniformly distributed, fully mixed and clean airflow environment near the operating table.

[0020] The dual-zone negative pressure suction assembly is placed at the front end of the device, so that it directly faces the ventilated hollow operating table. By forming a more uniform and comprehensive negative pressure field inside the operating table, the initial capture efficiency of harmful gases and particulate matter is significantly improved, and pollutants are prevented from diffusing and retaining in the operating table. The subsequent air supply pipeline transports purified air, and there is no need to set up a filtering device, thereby reducing the resistance of the subsequent pipeline; secondly, the right centrifugal gear blower assembly and the left centrifugal gear blower assembly are driven by the rotary drive assembly and the transmission shaft to form multi-point and multi-directional air flow, and the high-pressure airflow provided by the centrifugal action has a stronger blowing force, which can effectively penetrate the ventilated hollow operating table and promote the rapid and full mixing of the purified air with the residual air in the table. At this time, the purified air is blown back to the ventilated hollow operating table, forming a closed loop with the front suction, maintaining a slightly positive pressure or balanced pressure environment, and reducing the demand for external fresh air;

[0021] Finally, the front dual-zone negative pressure suction assembly is responsible for setting and maintaining the total exhaust volume required by the operating table. The purified air is transported to the left and right blower assemblies through pipes. The left and right blower assemblies focus on sending the purified air back to the operating table efficiently and evenly. The clear division of responsibilities avoids the contradiction of a single fan having to overcome high filtration resistance while ensuring the air supply effect in complex spaces. The low-resistance purified air delivery duct further reduces ineffective energy loss and mechanical loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the dual-zone negative pressure suction assembly of the present invention;

[0025] Figure 4 Schematic diagram of the three-dimensional structure of the present invention Figure 3 ;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotary drive assembly of the present invention;

[0027] Figure 6 Schematic diagram of the three-dimensional structure of the right centrifugal gear blast assembly according to the second embodiment of the present invention Figure 1 ;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the air intake disk head according to the second embodiment of the present invention;

[0029] Figure 8Schematic diagram of the three-dimensional structure of the right centrifugal gear blast assembly according to the second embodiment of the present invention Figure 2 ;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention.

[0031] Figure: 1. Bottom frame; 2. Ventilated hollow operating table; 3. C-port column; 4. Support frame; 401. Triangular side plate; 402. Horizontal column; 5. Z-axis screw lifting module; 6. Right centrifugal gear blast assembly; 601. Centrifugal fan; 602. Inlet disk head; 6021. Cavity; 6022. Vertical column cavity; 603. Final gear disc; 604. Secondary gear shaft; 605. Primary gear shaft; 606. Secondary on / off valve; 7. Left centrifugal gear blast assembly; 8. Drive shaft ; 9. Rotary drive assembly; 901. Motor; 902. Main shaft; 903. Shaft frame; 904. Bevel gear right-angle transmission structure; 10. PLC control panel; 11. Through hole; 12. Dual-zone negative pressure suction assembly; 1201. Vacuum pump; 1202. L-shaped air inlet pipe; 1203. Horizontal pipe; 1204. First switch valve; 1205. Filter; 1206. Z-shaped pipe; 1207. Corrugated expansion pipe; 13. Tee pipe; 14. Connecting pipe; 15. Air duct. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Embodiment 1, by Figures 1 to 5 The present invention includes a bottom frame 1, a ventilated hollow operating table 2 installed on the top of the bottom frame 1, C-shaped columns 3 fixed at two corner positions of the top of the bottom frame 1 on one side of the ventilated hollow operating table 2, and a support frame 4 slidably installed between the two C-shaped columns 3, a Z-axis screw lifting module 5 for driving the support frame 4 to perform Z-axis lifting is installed on the outer wall of one side of one C-shaped column 3, a dual-zone negative pressure suction assembly 12 is installed at the bottom end of the bottom frame 1, the air inlet of the dual-zone negative pressure suction assembly 12 extends to the interior of the ventilated hollow operating table 2, and a through hole 11 is provided on the upper surface of the ventilated hollow operating table 2;

[0034] The left centrifugal gear blast assembly 7 and the right centrifugal gear blast assembly 6 are respectively installed on the left and right inner walls of the support frame 4. A three-way pipe 13 is installed between the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7. One end of the three-way pipe 13 is installed with a connecting pipe 14 interconnected with the air outlet of the dual-zone negative pressure suction assembly 12. The three-way pipe 13 and the connecting pipe 14 realize the diversion of air in two directions, greatly improving the flexibility and adjustment ability of the ventilation of the device;

[0035] A rotary drive assembly 9 for driving the right centrifugal gear blast assembly 6 is mounted on one side outer wall of the support frame 4. A transmission shaft 8 for maintaining power connection is also mounted between the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7. A PLC control panel 10 electrically connected to the input end of the Z-axis screw lifting module 5, the rotary drive assembly 9, and the dual-zone negative pressure suction assembly 12 is mounted on one side outer wall of the ventilated hollow operating table 2.

[0036] The support frame 4 is composed of a triangular side plate 401 slidably mounted on the inner wall of the C-mouth column 3 and a horizontal column 402 mounted on the outer walls of the two triangular side plates 401 on opposite sides. The moving end of the Z-axis screw lifting module 5 is fixedly connected to the outer wall of one side of the triangular side plates 401. When the Z-axis screw lifting module 5 is used to drive the support frame 4, the right centrifugal gear blast assembly 6, the left centrifugal gear blast assembly 7 and other components to perform Z-axis lifting, the moving end of the Z-axis screw lifting module 5 drives one of the triangular side plates 401 to slide on the extension path of the C-mouth column 3, and the horizontal column 402 serves the purpose of connecting the other triangular side plate 401. During this process, the triangular side plate 401 slides with the C-mouth column 3 through the roller;

[0037] The dual-zone negative pressure suction assembly 12 includes L-shaped air inlet pipes 1202 installed on both sides of the bottom end of the ventilated hollow operating table 2, a horizontal pipe 1203 installed between the two L-shaped air inlet pipes 1202, and a first switch valve 1204 installed at one end of one of the L-shaped air inlet pipes 1202. A Z-shaped tube 1206 is installed on the outer wall of one side of one of the L-shaped air inlet pipes 1202. A vacuum pump 1201 is installed on one side of the top of the bottom frame 1. A filter 1205 is installed at the air inlet of the vacuum pump 1201. The air inlet of the filter 1205 and one end of the Z-shaped tube 1206 are connected to each other. A corrugated telescopic tube 1207 extending vertically upward is installed at the air outlet of the vacuum pump 1201. The end of the corrugated telescopic tube 1207 away from the vacuum pump 1201 is connected to one end of the connecting pipe 14.

[0038] When the dual-zone negative pressure suction assembly 12 is working, the vacuum pump 1201 is turned on through the PLC control panel 10, and the first switch valve 1204 is closed, and then the air inlet of the L-shaped air inlet pipe 1202 generates negative pressure suction. The air sucked in enters the filter 1205 for filtration and purification, and then the filtered air is sent to the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7 through the vacuum pump 1201, the bellows expansion pipe 1207, the connecting pipe 14, and the three-way pipe 13. By concentrating the high-resistance filtration link at the front end, its interference with the subsequent blast assembly is isolated, thereby ensuring the overall air volume stability;

[0039] The rotary drive assembly 9 includes a motor 901 installed on the outer wall of one side of another triangular side plate 401, a main shaft 902 installed at the lower end of the driving shaft of the motor 901 through a cross universal joint, and an axis-carrying frame 903 fixed on the outer wall of one side of another triangular side plate 401. The lower end of the main shaft 902 extends to the interior of the axis-carrying frame 903 and is installed with a bevel gear right-angle transmission structure 904 for driving the right centrifugal gear blower assembly 6 to work. When the rotary drive assembly 9 transmits rotational power to the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7, the motor 901 works according to the direction, speed, angle, and response time set by the PLC control panel 10. The driving shaft of the motor 901 drives the right centrifugal gear blower assembly 6 to work through the main shaft 902 and the bevel gear right-angle transmission structure 904. By adjusting the speed of a single driving source, the air supply volume on both sides can be synchronously controlled to maintain the dynamic balance of the flow field.

[0040] A ventilation method for a laboratory workbench according to this embodiment, such as the above-mentioned laboratory workbench ventilation device, includes the following steps:

[0041] S101: The Z-axis screw lifting module 5 is controlled by the PLC control panel 10 to operate, and the Z-axis screw lifting module 5 drives the support frame 4, the rotary drive assembly 9, the right centrifugal gear blast assembly 6, the transmission shaft 8, the left centrifugal gear blast assembly 7, the three-way pipe 13, and the connecting pipe 14 to move up and down in the vertical direction to change the operating height of the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7;

[0042] S102: After the operating height adjustment of the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7 is completed, the rotation drive assembly 9 and the dual-zone negative pressure suction assembly 12 are started through the PLC control panel 10. A stable negative pressure field is formed at the air inlet of the dual-zone negative pressure suction assembly 12. The negative pressure field strongly absorbs the air inside the operating table. Driven by the negative pressure, the air is concentrated and collected into the internal air duct of the dual-zone negative pressure suction assembly 12 and filtered.

[0043] S103: The purified air is collected at the air outlet of the dual-zone negative pressure suction assembly 12 and evenly divided into two airflows through the connecting pipe 14 and the three-way pipe 13. The two purified airflows enter the air inlets of the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7. The rotary drive assembly 9 transmits power to the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7 synchronously and reliably through the transmission shaft 8, ensuring that the rotation speeds of the two are coordinated. The powered left and right blower assemblies rotate at high speed, and the centrifugal impeller accelerates the clean air to be ejected, converting it into high-pressure airflow in the volute, significantly increasing the kinetic energy and pressure of the air.

[0044] S104: The right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7 spray air into the operating position through their respective air outlets from the symmetrical positions on both sides of the ventilated hollow operating table 2. The airflows on both sides intersect and merge in the center of the working area, completely eliminating single-point air supply blind spots and achieving full coverage of the operating area.

[0045] Example 2, based on Example 1, Figure 6 、 Figure 7 、 Figure 8 and Figure 9 It is given that the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7 have the same structural composition. The right centrifugal gear blast assembly 6 includes a centrifugal fan 601 fixed on the outer wall of one side of another triangular side plate 401, an air intake disc head 602 installed on the outer wall on the air inlet side of the centrifugal fan 601, and a second switch valve 606 installed on the outer wall on one side of the air intake disc head 602. One end of the second switch valve 606 is interconnected with one end of the three-way pipe 13. A final-stage gear disc 603 is installed on the input shaft of the centrifugal fan 601, and the input shaft of the centrifugal fan 601 is power-connected with the main shaft 902 through a bevel gear right-angle transmission structure 904. A secondary gear shaft 604 is rotatably installed on the outer wall of the triangular side plate 401 on one side of the final-stage gear disc 603. The secondary gear shaft 604 and the final-stage gear disc 603 are meshed with each other. A primary gear shaft 605 is fixed at both ends of the surface of the transmission shaft 8, and the primary gear shaft 605 and the secondary gear shaft 604 are meshed with each other.

[0046] The filtered air passes through the three-way pipe 13 and the second on-off valve 606 and enters the air intake disc 602. The air is then sent to the air inlet of the centrifugal fan 601 by the air intake disc 602. The input shaft of the centrifugal fan 601 is driven to rotate by the main shaft 902 through the bevel gear right-angle transmission structure 904. At this time, the right centrifugal gear blower assembly 6 is able to start blowing.

[0047] The air intake disc 602 has a cavity 6021 formed therein. A longitudinal column cavity 6022 is provided on the other side of the air intake disc 602 for connecting the cavity 6021 and the second switch valve 606. The bevel gear right-angle transmission structure 904 includes a driven bevel gear mounted on the input shaft of the centrifugal fan 601 and a driving bevel gear mounted on the lower end of the main shaft 902. The driven bevel gear and the driving bevel gear are meshed with each other.

[0048] The input shaft of the centrifugal fan 601 drives the secondary gear shaft 604, the primary gear shaft 605, and the transmission shaft 8 to rotate in sequence through the final gear disc 603. Then the transmission shaft 8 drives the left centrifugal gear blast assembly 7 to work. At this time, the left centrifugal gear blast assembly 7 and the right centrifugal gear blast assembly 6 are able to work synchronously at the same speed. The two throw out the airflow at high speed, generating a high-pressure airflow with strong penetrating power, ensuring that the purified air covers the entire area of ​​the ventilated hollow operating table 2.

[0049] An air duct 15 is installed at the lower end of the exhaust outlet of the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7. The air duct 15 collects the air blown out by the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7 and forms a laminar flow, eliminating single-point air supply dead corners and achieving uniform air flow distribution in the working area.

[0050] When the embodiment of the present application is in use, the staff first controls the Z-axis screw lifting module 5 through the PLC control panel 10 to work, and uses the Z-axis screw lifting module 5 to drive the support frame 4, the rotation drive assembly 9, the right centrifugal gear blast assembly 6, the transmission shaft 8, the left centrifugal gear blast assembly 7 and the three-way pipe 13 and the connecting pipe 14 to move up and down in the vertical direction to change the use height of the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7. During this process, the connecting pipe 14 maintains the air path unobstructed through the dual-zone negative pressure suction assembly 12; after the use height debugging of the right centrifugal gear blast assembly 6 and the left centrifugal gear blast assembly 7 is completed, the PLC control panel 10 is used to control the Z-axis screw lifting module 5 to move up and down. The C control panel 10 turns on the rotary drive assembly 9 and the dual-zone negative pressure suction assembly 12 to work. During the experiment, harmful gases, vapors or particulate matter are generated at the ventilated hollow operating table 2. A stable negative pressure field is formed at the air inlet of the dual-zone negative pressure suction assembly 12. The negative pressure field strongly absorbs the air inside the operating table to ensure that the newly released pollutants are quickly entrained into the air flow to avoid diffusion or retention in the operating space. The dual-zone design makes the negative pressure coverage more uniform, with fewer dead corners and higher capture efficiency. Driven by negative pressure, the polluted air flow is concentrated into the internal air duct of the ventilated hollow operating table 2 and is filtered. When the polluted air flows through the filter structure, the harmful particulate matter, aerosols or chemicals in it are removed. The chemical pollutants are intercepted, adsorbed, and converted into clean air that meets safety standards; the purified air is collected at the air outlet of the dual-zone negative pressure suction assembly 12, and is evenly divided into two air flows through the connecting pipe 14 and the three-way pipe 13. The two purified air flows enter the air inlets of the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7. Since the air has been purified, there is no need to filter this section of the pipeline and the resistance is extremely small; the rotary drive assembly 9 transmits power synchronously and reliably to the right centrifugal gear blower assembly 6 and the left centrifugal gear blower assembly 7 through the transmission shaft to ensure that the speeds of the two are coordinated. The left and right blower assemblies that obtain power rotate at high speed, and the centrifugal impellers inhale the clean air. It is accelerated and thrown out, and converted into high-pressure airflow in the volute, which significantly increases the kinetic energy and pressure of the air. The high-pressure clean airflow generated by the left and right blower assemblies is directionally sprayed into the operating position from the symmetrical positions on both sides of the ventilation type hollow operating table 2 through their respective air outlets. The airflows on both sides intersect and merge in the central area of ​​the working area, completely eliminating the single-point air supply dead angle and achieving full coverage of the operating area; during the ventilation process, the staff controls the speed of the rotary drive assembly 9 through the PLC control panel 10, and then synchronously changes the air supply volume of the left and right blower assemblies, and at the same time adjusts the suction intensity of the dual-zone negative pressure suction assembly 12, dynamically maintaining the air volume balance, pressure stability and ideal flow field distribution at the ventilation type hollow operating table 2.

[0051] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation device for an experimental operating table, characterized by: The invention comprises a bottom frame (1), a ventilated hollow operating table (2) installed at the top of the bottom frame (1), a C-shaped column (3) fixed at two corner positions of the top of the bottom frame (1) on one side of the ventilated hollow operating table (2), and a support frame (4) slidably installed between the two C-shaped columns (3), wherein a Z-axis screw rod lifting module (5) for driving the support frame (4) to perform Z-axis lifting is installed on the outer wall of one side of the C-shaped column (3), and a dual-zone negative pressure suction assembly (12) is installed at the bottom end of the bottom frame (1). The air outlet extends to the interior of the ventilation type hollow operating table (2), and the left centrifugal gear blast assembly (7) and the right centrifugal gear blast assembly (6) are respectively installed on the left and right inner walls of the support frame (4). A three-way pipe (13) is installed between the right centrifugal gear blast assembly (6) and the left centrifugal gear blast assembly (7). One end of the three-way pipe (13) is installed with a connecting pipe (14) interconnected with the air outlet of the double-zone negative pressure suction assembly (12). A working device for driving the right centrifugal gear blast assembly (6) is installed on the outer wall of one side of the support frame (4). A rotation drive assembly (9) for operation, a transmission shaft (8) for maintaining power connection is also installed between the right centrifugal gear blast assembly (6) and the left centrifugal gear blast assembly (7), and a PLC control panel (10) electrically connected to the Z-axis screw lifting module (5), the rotation drive assembly (9), and the input end of the dual-zone negative pressure suction assembly (12) is installed on the outer wall of one side of the ventilation type hollow operating table (2); the dual-zone negative pressure suction assembly (12) includes an L-shaped air intake pipe (120) installed on both sides of the bottom end of the ventilation type hollow operating table (2) 2) a transverse pipe (1203) installed between the two L-shaped air inlet pipes (1202) and a first switch valve (1204) installed at one end of one of the L-shaped air inlet pipes (1202); a Z-shaped pipe (1206) is installed on the outer wall of one side of one of the L-shaped air inlet pipes (1202); a vacuum pump (1201) is installed on one side of the top of the bottom frame (1); a filter (1205) is installed at the air inlet of the vacuum pump (1201); and the air inlet of the filter (1205) and one end of the Z-shaped pipe (1206) are connected to each other.

2. A laboratory operating table ventilation device according to claim 1, characterized in that: The support frame (4) is composed of a triangular side plate (401) slidably mounted on the inner wall of the C-mouth column (3) and a horizontal column (402) mounted on the outer walls of the two triangular side plates (401) on opposite sides. The movable end of the Z-axis screw lifting module (5) is fixedly connected to the outer wall of one side of one of the triangular side plates (401).

3. A laboratory operating table ventilation device according to claim 2, characterized in that: The upper surface of the ventilated hollow operating table (2) is provided with a through hole (11).

4. A laboratory operating table ventilation device according to claim 3, characterized in that: The air outlet of the vacuum pump (1201) is provided with a bellows expansion tube (1207) extending vertically upwards, and one end of the bellows expansion tube (1207) away from the vacuum pump (1201) is connected to one end of the connecting tube (14).

5. The experimental table ventilation device according to claim 4, characterized in that: The rotary drive assembly (9) comprises a motor (901) mounted on the outer wall of one side of the other triangular side plate (401), a main shaft (902) mounted on the lower end of the drive shaft of the motor (901) via a cross universal joint, and a shaft-carrying frame (903) fixed on the outer wall of one side of the other triangular side plate (401), wherein the lower end of the main shaft (902) extends into the interior of the shaft-carrying frame (903) and is equipped with a bevel gear right-angle transmission structure (904) for driving the right centrifugal gear blower assembly (6) to work.

6. The experimental table ventilation device according to claim 5, characterized in that: The right centrifugal gear blast assembly (6) and the left centrifugal gear blast assembly (7) have the same structural composition. The right centrifugal gear blast assembly (6) includes a centrifugal fan (601) fixed on the outer wall of one side of the other triangular side plate (401), an air inlet disk (602) installed on the outer wall of the air inlet side of the centrifugal fan (601), and a second switch valve (606) installed on the outer wall of one side of the air inlet disk (602). One end of the second switch valve (606) is connected to one end of the three-way pipe (13). The centrifugal fan (601) A final gear disc (603) is installed on the input shaft of the centrifugal fan (601), and the input shaft of the centrifugal fan (601) is connected to the main shaft (902) through a bevel gear right-angle transmission structure (904). A secondary gear shaft (604) is rotatably installed on the outer wall of the triangular side plate (401) on one side of the final gear disc (603), and the secondary gear shaft (604) and the final gear disc (603) are meshed with each other. A primary gear shaft (605) is fixed to both ends of the surface of the transmission shaft (8), and the primary gear shaft (605) and the secondary gear shaft (604) are meshed with each other.

7. The experimental table ventilation device according to claim 6, characterized in that: A cavity (6021) is provided inside the air intake disc head (602), and a longitudinal column cavity (6022) for communicating with the cavity (6021) and the second switch valve (606) is provided on the other side of the air intake disc head (602). The bevel gear right-angle transmission structure (904) comprises a driven bevel gear mounted on the input shaft of the centrifugal fan (601) and a driving bevel gear mounted on the lower end of the main shaft (902), and the driven bevel gear and the driving bevel gear are meshed with each other.

8. The experimental table ventilation device according to claim 7, characterized in that: An air duct (15) is commonly installed at the lower ends of the air outlets of the right centrifugal gear air blast assembly (6) and the left centrifugal gear air blast assembly (7).

9. A method for ventilating a laboratory workbench, comprising the laboratory workbench ventilation device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S101: The Z-axis screw lifting module (5) is controlled to work through the PLC control panel (10), and the Z-axis screw lifting module (5) is used to drive the support frame (4), the rotary drive assembly (9), the right centrifugal gear blast assembly (6), the transmission shaft (8), the left centrifugal gear blast assembly (7), the three-way pipe (13), and the connecting pipe (14) to move up and down in the vertical direction to change the use height of the right centrifugal gear blast assembly (6) and the left centrifugal gear blast assembly (7); S102: After the use height adjustment of the right centrifugal gear blast assembly (6) and the left centrifugal gear blast assembly (7) is completed, the rotation drive assembly (9) and the dual-zone negative pressure suction assembly (12) are turned on through the PLC control panel (10) to start working. A stable negative pressure field is formed at the air inlet of the dual-zone negative pressure suction assembly (12). The negative pressure field strongly absorbs the air inside the operating table. Under the negative pressure drive, the air is concentrated into the internal air duct of the dual-zone negative pressure suction assembly (12) and is filtered; S103: The purified air is collected at the air outlet of the dual-zone negative pressure suction assembly (12), and is evenly divided into two air flows through the connecting pipe (14) and the three-way pipe (13). The two purified air flows enter the air inlets of the right centrifugal gear blower assembly (6) and the left centrifugal gear blower assembly (7). The rotary drive assembly (9) transmits the power to the right centrifugal gear blower assembly (6) and the left centrifugal gear blower assembly (7) synchronously and reliably through the transmission shaft (8), ensuring that the rotation speeds of the two are coordinated. The left and right blower assemblies that obtain power rotate at high speed, and the centrifugal impeller accelerates the clean air sucked in and throws it out, converting it into high-pressure air flow in the volute, significantly increasing the kinetic energy and pressure of the air. S104: The right centrifugal gear blower assembly (6) and the left centrifugal gear blower assembly (7) spray air into the operating position through their respective air outlets from the symmetrical positions on both sides of the ventilated hollow operating table (2). The airflows on both sides intersect and merge in the central area of ​​the working area, completely eliminating the single-point air supply dead angle and achieving full coverage of the operating area.

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