Multi-filter-element adaptive ventilation cabinet with temperature and humidity balancing function

Abstract

The invention discloses a multi-filter-element adaptive fume hood with a temperature and humidity balancing function, and belongs to the technical field of fume hoods, the multi-filter-element adaptive fume hood comprises a fume hood body, the inner side of the fume hood body is provided with a temperature adaptation adjusting assembly, and the inner side of the fume hood body is provided with a temperature adaptation adjusting assembly; the temperature adaptation adjusting assembly comprises an air outlet adjusting unit and a driving unit used for driving the air outlet adjusting unit, a high-expansion-coefficient mineral oil mixed solution serves as a temperature sensitive type power source, compared with traditional bimetallic strip adjustment, force output is smoother and free of rigid impact, and temperature fluctuation caused by sudden change of the air outlet amount can be avoided; the liquid power source is resistant to acid and alkali corrosion, wide in adjusting range and capable of stably responding to temperature changes of chemical laboratory acid and alkali reaction heat release, biological safety laboratory constant-temperature culture and other scenes, liquid leakage can be completely avoided through sealing fit of the piston and the containing barrel, and the requirement for laboratory cleanliness is met. The problems that traditional electric control temperature adjustment is prone to faults, and double metal sheets are poor in corrosion resistance are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of fume hoods, specifically a multi-filter adaptable fume hood with temperature and humidity balancing function. Background Technology

[0002] In chemical laboratories (such as organic synthesis and acid-base reaction experiments), biosafety laboratories (such as microbial culture and sample smearing), and electronic cleanrooms (such as semiconductor welding and precision component assembly), experimental processes are often accompanied by temperature changes (such as exothermic acid-base reactions and heat generation during equipment operation). Fume hoods are required to maintain stable temperatures within the hood to ensure experimental accuracy and safety. For example, in chemical laboratories, excessively high temperatures in acid-base neutralization reactions can lead to uncontrolled reaction rates; microbial culture in biosafety laboratories requires a constant temperature environment, and temperature fluctuations can easily cause strain inactivation; and in electronic cleanrooms, unstable temperatures during semiconductor welding can affect solder joint quality. Therefore, "temperature balance" is a core requirement for fume hoods in these scenarios. However, existing fume hoods have many problems in temperature regulation and supporting functions, making it difficult to meet actual usage needs. Traditional fume hoods often use bimetallic strips as temperature-sensitive elements, which drive the airflow regulation through bending force. However, the force output of bimetallic strips is "step-like," which can easily lead to sudden changes in airflow and cause temperature fluctuations. In addition, bimetallic strips have weak corrosion resistance and are prone to oxidation and rust in the acidic and alkaline environment of chemical laboratories, resulting in a short service life. Some fume hoods use an electronic sensor + motor regulation method, which has slightly higher accuracy, but the sensor is susceptible to electromagnetic interference or chemical corrosion failure in the laboratory, and motor failure can directly lead to the paralysis of temperature regulation, making it difficult to adapt to complex experimental scenarios. Most existing fume hoods only focus on the exhaust of hot air inside the hood (temperature control), neglecting the quality of the incoming air. When outside air enters the hood directly, the dust, hair, and other impurities it carries can easily contaminate experimental samples (such as microbial culture dishes in biological laboratories and precision components in electronic workshops). Although some fume hoods have added inlet filters, the filter and the connecting structure are poorly sealed, and unfiltered air can easily enter through the gaps. In addition, there is a lack of reverse leakage prevention design, and contaminated air inside the hood may leak into the laboratory through the air inlet pipe, endangering the health of the operators. The intake-side fresh air filter needs to filter external impurities, so it needs to be replaced much more frequently than the exhaust-side exhaust gas treatment filter. However, the filters in traditional fume hoods are mostly fixed with bolts or snap-fit ​​connections, which require tools to disassemble during replacement. This is cumbersome, and negative pressure can easily form inside the hood during disassembly, causing unfiltered air to flow back in, further increasing the risk of pollution. On the other hand, the exhaust-side exhaust gas treatment filter, which is replaced less frequently, often uses the same complex structure as the intake-side filter, resulting in wasted costs. Fume hoods that use liquid as a temperature-sensitive power source require disassembly of the entire structure, including connecting pipes and fixed supports, for liquid replacement. This is a complex operation, and the sealing structure is easily damaged by repeated disassembly, leading to liquid leakage. The reset mechanism often lacks limit protection, and the springs are prone to failure due to lateral bending, requiring frequent replacement. This not only increases maintenance costs but also affects the experimental progress due to downtime. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-filter adaptable fume hood with temperature and humidity balancing function to solve the problems of existing fume hoods mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a fume hood body is included, and a temperature adaptation and adjustment component is installed on the inner side of the fume hood body. The temperature adaptation and adjustment component includes an exhaust regulating unit and a driving unit for driving the exhaust regulating unit. The temperature adaptation and adjustment component also includes an installation and replacement unit for installing and replacing the driving unit, and a reset unit for resetting the driving unit. An air inlet and outlet unit is installed on the upper side of the temperature adaptation and adjustment component, and a filter replacement unit for replacing the filter element is provided on the air inlet and outlet unit. As a further preferred embodiment of this technical solution: the drive unit includes a holding tank, and a temperature-sensitive liquid power source is held inside the holding tank. The temperature-sensitive liquid power source is a mineral oil mixture with a high expansion coefficient. A piston is slidably attached to the inside of the holding tank, and a connecting slide rod is provided on the upper side of the piston. As a further preferred embodiment of this technical solution: the exhaust regulating unit includes an adjusting groove provided on the connecting slide rod, and the exhaust regulating unit also includes a baffle provided at the end of the connecting slide rod away from the piston. The exhaust regulating unit also includes a connecting cover installed on the upper side of the fume hood body, and a partition is connected to the inner side of the connecting cover. The connecting cover is provided with air holes. As a further preferred embodiment of this technical solution: the installation and replacement unit includes a sealing threaded collar disposed at the upper end of the container, and the inner side of the sealing threaded collar is threadedly connected to a threaded cylinder. As a further preferred embodiment of this technical solution: the reset unit includes a first spring connected to the upper side of the threaded cylinder, and a connecting ring is connected to the end of the first spring away from the threaded cylinder. The reset adjustment unit also includes a connecting cylinder installed on the outside of the threaded cylinder. As a further preferred embodiment of this technical solution: the connecting ring is fixedly disposed on the outside of the connecting slide rod, and the connecting ring is disposed on the inside of the connecting cylinder, and the connecting cylinder is fixedly disposed on the inside of the fume hood body through the connecting plate, while the threaded cylinder is fixedly disposed on the inside of the connecting cylinder; As a further preferred embodiment of this technical solution: the piston is slidably connected to the inner side of the container and the threaded cylinder, and the connecting slide rod is slidably connected to the upper middle position of the fume hood body. Two sets of baffles are provided and symmetrically arranged at the upper end of the connecting slide rod. At the same time, the baffles are slidably connected to the inner side of the connecting cover. As a further preferred embodiment of this technical solution: the partition is slidably connected to the inner side of the adjusting groove, and the side of the baffle away from the connecting cover is slidably connected to the outer side of the partition, and the partition is disposed between the two sets of baffles, while several sets of air holes are disposed and evenly and symmetrically distributed on both sides of the connecting cover. As a further preferred embodiment of this technical solution: the air inlet and outlet unit includes a connecting shell installed on the fume hood body, a connecting pipe is connected to the middle position of one side of the connecting shell, and a flange is connected to the end of the connecting pipe away from the connecting shell. As a further preferred embodiment of this technical solution: the connecting shell is provided in two sets and symmetrically installed on both sides of the connecting cover, the connecting cover is fixedly installed in the middle position of the two sets of connecting shells, and the air holes are correspondingly provided with the connecting shells.

[0005] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, a mineral oil mixture with a high coefficient of expansion is used as a temperature-sensitive power source. Compared with traditional bimetallic strip regulation, the force output is smoother and without rigid impact, which can avoid temperature fluctuations caused by sudden changes in gas output. Moreover, the liquid power source is resistant to acid and alkali corrosion, has a wide adjustment range, and can stably respond to temperature changes in scenarios such as exothermic acid-base reactions in chemical laboratories and constant temperature incubation in biosafety laboratories. At the same time, the sealing fit between the piston and the container can completely prevent liquid leakage, meet the cleanliness requirements of the laboratory, and effectively solve the problems of easy failure of traditional electronic temperature regulation and poor corrosion resistance of bimetallic strips. 2. In this invention, through the design of a dedicated fresh air filter element and sealing structure on the air intake side, outside air must be filtered by a pre-filter and a medium-efficiency composite filter element before entering the cabinet. Combined with the annular silicone sealing strip on the underside of the connecting slide plate, it can prevent dust, hair and other impurities from affecting experiments with high environmental cleanliness requirements, such as microbial culture and semiconductor welding. At the same time, the one-way valve for air intake can automatically close when there is no negative pressure inside the cabinet, preventing the reverse leakage of contaminated air inside the cabinet, thus solving the problem of traditional fume hoods having no air intake filtration or poor sealing after filtration. 3. In this invention, the intake side filter replacement unit adopts an elastic locking structure of a second spring and a fastening ball, which can be disassembled and assembled without tools, much faster than the traditional bolt fixing method. During disassembly, the intake one-way valve closes simultaneously, which can prevent unfiltered air from flowing back in, perfectly adapting to the high-frequency replacement needs of the intake side fresh air filter. On the exhaust side, a simple structure is adopted according to the low replacement frequency of the exhaust gas treatment filter, which takes into account both efficiency and cost, and solves the problem of cumbersome and time-consuming traditional filter replacement operation. 4. In this invention, when the fresh air filter on the intake side is saturated and needs to be replaced, hold the handle on the outside of the connecting slide plate and apply outward pulling force to overcome the preload of the second spring, causing the fastening ball to disengage from the arc-shaped groove of the positioning slider. Pull out the connecting slide plate and the filter body, replace the new filter, and push the connecting slide plate back. Under the action of the second spring, the fastening ball is embedded in the arc-shaped groove and locked. At the same time, the sealing strip adheres to the inner wall of the intake connecting shell to ensure a seal. When the liquid power source is aged or contaminated, rotate the container clockwise to disengage the sealing threaded collar from the threaded cylinder. Remove the container, replace the liquid, and retighten to complete the maintenance. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of a multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 1 ; Figure 2 This invention provides a structural illustration of a multi-filter adapter fume hood with temperature and humidity balancing function. meaning Figure 2 ; Figure 3 This is a schematic diagram of the structure of a multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the structure of a multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 4 ; Figure 5 This is a partial structural diagram of a multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 1 ; Figure 6 This is a partial exploded view of the multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 1 ; Figure 7 This is a partial exploded view of the multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 2 ; Figure 8 This is a partial exploded view of the multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 3 ; Figure 9 This is a partial exploded view of the multi-filter adapter fume hood with temperature and humidity balancing function according to the present invention. Figure 4 .

[0007] In the diagram: 1. Fume hood body; 2. Temperature adaptation and adjustment component; Drive unit: 21. Container; 22. Piston; 23. Connecting slide rod; Air outlet adjustment unit: 24. Adjustment groove; 25. Baffle; 211. Partition; 212. Connecting cover; 213. Air hole; Installation and replacement unit: 26. Sealing threaded collar; 27. Threaded cylinder; Reset unit: 28, first spring; 29, connecting ring; 210, connecting cylinder; 3. Air inlet / outlet unit; 31. Connecting housing; 32. Connecting duct; 33. Flange; 4. Filter element replacement unit; 41. Connecting slide plate; 42. Filter element body; 43. Positioning hole; 44. Positioning slider; 45. Second spring; 46. Fastening ball. Detailed Implementation

[0008] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0009] Please see Figures 1-9 This is a schematic diagram of some embodiments of the multi-filter adapter fume hood with temperature and humidity balancing function of this application.

[0010] In some embodiments, multi-filter adaptive fume hoods with temperature and humidity balancing functions can be applied in fields such as chemical laboratories, biosafety laboratories, and electronic cleanrooms. Chemical laboratories can be used for experiments requiring real-time temperature control and waste gas treatment, such as organic synthesis and acid-base reactions; biosafety laboratories can be used for operations requiring a stable environment, such as microbial culture and sample smearing; and electronic cleanrooms can be used for scenarios requiring low-dust and temperature control, such as semiconductor welding and precision component assembly. Figure 1 In this embodiment, the fume hood is described as being used in an acid-base reaction experiment in a chemical laboratory. Of course, fume hoods in other application areas can also adopt a similar structure, which will not be elaborated on later.

[0011] It is understood that the schematic diagram only shows the core components of the fume hood (fume hood body 1, temperature adaptation and adjustment component 2, air inlet and outlet unit 3). The actual shape (e.g., the fume hood body 1 can be designed as square or arc), actual size, and actual position (temperature adaptation and adjustment component 2 can be installed at the bottom or side wall) of these components are not limited by the schematic diagram. The fume hood may also include auxiliary components such as glass observation door, experimental workbench, and local lighting module to improve the convenience and safety of operation.

[0012] In some embodiments, a multi-filter adapter fume hood with temperature and humidity balancing function may include a fume hood body 1, a temperature adaptation and adjustment component 2, an air inlet and outlet unit 3, and a filter replacement unit 4. The temperature adaptation and adjustment component 2 is installed inside the fume hood body 1, the air inlet and outlet unit 3 is installed on the upper side of the temperature adaptation and adjustment component 2, and the filter replacement unit 4 is disposed on the air inlet and outlet unit 3.

[0013] It should be noted that when the fume hood is used for acid-base reaction experiments in a chemical laboratory, the fume hood body 1 can serve as the main frame for experimental operation and environmental control (the inside is treated with anti-corrosion measures to resist hydrochloric acid and sodium hydroxide corrosion); the temperature adaptation and adjustment component 2 can respond to the heat released during the experiment and adjust the air volume to balance the temperature through the expansion force of the liquid; the air inlet and outlet unit 3 can realize air replacement by "exiting hot air and replenishing fresh air"; the filter replacement unit 4 can easily replace the acid gas filter element to avoid leakage of corrosive exhaust gas.

[0014] For example, the fume hood may also include a sliding glass observation door (not shown in the figure). The glass observation door is connected to the front side of the fume hood body 1 by a hinge. The opening is opened during experimental operation and completely closed when the experiment is in a static state, which ensures both operational convenience and reduces the risk of exhaust gas leakage.

[0015] In some embodiments, the drive unit may include a container 21, a temperature-sensitive fluid power source, a piston 22, and a connecting slide 23, wherein: The container 21 is a cylindrical stainless steel structure, which is fixed to the bottom inside the fume hood body 1 with bolts to prevent it from tipping over; The temperature-sensitive liquid power source is a high-expansion-coefficient mineral oil mixture (dioctyl sebacate and dibutyl phthalate mixed in a 1:1 ratio, with a volume expansion coefficient of 0.000875 / ℃, a boiling point of >250℃, suitable for laboratory temperature range of 20-100℃), which is placed inside the container 21. The piston 22 is a circular polytetrafluoroethylene structure with the same inner diameter as the container 21. A nitrile rubber sealing ring is attached to the outside and is slidably connected to the inside of the container 21 to ensure a seal and prevent liquid leakage. The connecting slide rod 23 is a cylindrical rod made of 304 stainless steel. One end is vertically welded to the center of the upper side of the piston 22, and the other end extends through the upper side of the fume hood body 1 to the exhaust regulating unit.

[0016] It should be noted that when the temperature inside the cabinet rises (e.g., when the acid-base reaction releases heat to 45°C), the temperature-sensitive liquid power source expands in volume due to heat, generating hydraulic thrust (approximately 15-20N) that pushes the piston 22 to slide upward along the inner side of the container 21. The piston 22 drives the connecting slide rod 23 to move upward synchronously, converting the liquid thermal expansion force into mechanical displacement force, providing adjustment power for the gas outlet adjustment unit. When the temperature inside the cabinet decreases (e.g., when the reaction ends and the temperature drops to 25°C), the liquid power source cools and contracts, the hydraulic pressure disappears, and the reset unit drives the piston 22 and the connecting slide rod 23 to reset downward, waiting for the next temperature adjustment.

[0017] In this embodiment, a mineral oil mixture is used as the power source. Compared with traditional bimetallic strips, the force output is smoother, the corrosion resistance is stronger, and the adjustment range is wider. The sealed fit between the piston 22 and the container 21 can completely prevent liquid leakage from contaminating the experimental samples, which meets the cleanliness requirements of the laboratory.

[0018] It should be noted that the volume of the container 21 can be adjusted according to the size of the fume hood; here, only 100mL is used as an example. For example, in a large fume hood, a 200mL container 21 can be used to ensure that the liquid expansion force is sufficient to drive a larger exhaust regulating unit. Understandably, the length of the connecting slide rod 23 shown in the figure is only for illustration; the specific length needs to be matched according to the height of the fume hood body 1 and the displacement stroke of the piston 22, and is not limited here.

[0019] In some embodiments, the exhaust regulating unit may include an regulating groove 24, a baffle 25, a connecting cover 212, and a partition 211. Wherein: The adjusting groove 24 is a strip-shaped groove, which is opened on the outer side of the middle part of the connecting slide bar 23 and is used to cooperate with the partition 211 for limiting the position. The baffle 25 is an ABS plastic rectangular plate, and two sets are symmetrically welded to the top of the connecting slide rod 23. The outer side of the baffle 25 is attached to the inner side of the connecting cover 212. The connecting cover 212 is a transparent acrylic rectangular cover, which is fixed to the upper side of the fume hood body 1 by bolts, making it easy to observe the adjustment status; The partition 211 is an acrylic plate, which is vertically welded to the center of the inner side of the connecting cover 212, and is slidably connected to the inner side of the adjusting groove 24, and is located between the two sets of baffles 25. The vent 213 is a circular hole, evenly distributed on both sides of the connecting cover 212, for the exhaust of hot air inside the cabinet.

[0020] It should be noted that when the connecting slide rod 23 moves upward, it drives the two sets of baffles 25 to slide upward synchronously: in the initial state, the baffles 25 completely block the air holes 213; when it continues to move, the baffles 25 open the air holes 213; when it moves to the final position, the baffles 25 completely disengage from the air holes 213, the air output is maximized, and the hot air in the cabinet enters the connecting cover 212 through the air holes 213, and is then discharged through the air inlet and outlet unit 3, thereby reducing the temperature; the adjustment groove 24 and the partition 211 can limit the radial sway of the connecting slide rod 23, ensure that the baffles 25 accurately block the air holes 213, and avoid fluctuations in the air output.

[0021] In this embodiment, the linear blocking design of the baffle 25 and the air hole 213 makes the air output proportional to the temperature change; the transparent connecting cover 212 allows the operator to observe the position of the baffle 25 in real time and intuitively judge the temperature adjustment status; the symmetrical arrangement of the two sets of baffles 25 and the limiting of the partition 211 can avoid jamming caused by wear on one side of the connecting slide rod 23 and improve the reliability of the mechanism.

[0022] It should be noted that the shape of the vent 213 is not limited to a circle; it can also be designed as a square or a strip, as long as it can achieve "baffle 25 blocking - air volume adjustment". For example, in scenarios that require a large air volume, the vent 213 can be designed as a strip-shaped vent to improve air circulation efficiency.

[0023] In some embodiments, the installation and replacement unit may include a sealing threaded collar 26 and a threaded sleeve 27. Wherein: The sealing threaded collar 26 is a brass ring structure, integrally formed on the upper end of the container 21; The threaded cylinder 27 is a stainless steel cylindrical cylinder, which is threaded to the inner side of the sealing threaded collar 26 and fixed to the inner side of the fume hood body 1 through the connecting cylinder 210. The inner side of the threaded cylinder 27 is connected to the inner side of the container 21, and the piston 22 can slide along the inner side of the threaded cylinder 27 to ensure that the hydraulic transmission is uninterrupted.

[0024] It should be noted that when the temperature-sensitive liquid power source ages (e.g., the expansion coefficient decreases after 1 year of use) or becomes contaminated, the container 21 can be rotated clockwise to disengage the threaded sleeve 26 from the threaded cylinder 27. The container 21 can then be removed, the old liquid poured out, and new liquid injected. After replacement, the container 21 can be aligned with the threaded cylinder 27 and rotated counterclockwise until the threads are fully tightened (the resistance increases and no liquid leaks out), thus completing the maintenance.

[0025] In some embodiments, the reset unit may include a first spring 28, a connecting ring 29, and a connecting cylinder 210. Wherein: The first spring 28 is a piano wire compression spring, with one end welded to the upper side of the threaded cylinder 27 and the other end welded to the lower side of the connecting ring 29; The connecting ring 29 is a stainless steel ring structure, fixed to the outside of the connecting slide rod 23 and located inside the connecting cylinder 210; The connecting cylinder 210 is an aluminum alloy cylindrical cylinder, which is fixed to the inside of the fume hood body 1 by a connecting plate. The threaded cylinder 27 is fixed to the bottom of the connecting cylinder 210, and the connecting slide rod 23 slides through the connecting cylinder 210.

[0026] It should be noted that when the temperature rises, the connecting slide rod 23 drives the connecting ring 29 to move upward, compressing the first spring 28 to store elastic potential energy; when the temperature drops, the liquid power source contracts, the hydraulic pressure disappears, the first spring 28 releases elastic potential energy, pushes the connecting ring 29 to move downward, and drives the connecting slide rod 23 and piston 22 to return to the initial position, ensuring that the adjustment can be triggered again when the temperature rises next time; the connecting cylinder 210 can limit the radial sway of the connecting ring 29 and prevent the spring from bending to the side.

[0027] In this embodiment, the pre-compression design of the first spring 28 ensures stable reset force (even if a small amount of residual hydraulic fluid remains, it can still push the reset); the interference fit between the connecting ring 29 and the connecting slide 23 eliminates relative sliding loss, and the reset force transmission efficiency is 100%; the limiting function of the connecting cylinder 210 extends the fatigue life of the spring and is suitable for the daily adjustment frequency in the laboratory.

[0028] It should be noted that the stiffness of the first spring 28 can be adjusted according to the total weight of the connecting slide 23 and the piston 22; for example, if the total weight increases to 800g, a spring with a stiffness of 15N / mm can be selected to ensure that the reset force is sufficient to overcome the sliding friction. In some other embodiments, the reset unit may also be provided with a guide rod (parallel to the connecting slide 23) to further limit the swaying of the connecting ring 29, and is not limited to being limited only by the connecting cylinder 210.

[0029] In some embodiments, the air inlet / outlet unit 3 may include a connecting housing 31, a connecting pipe 32, and a flange 33. Wherein: The connecting shell 31 is a stainless steel rectangular shell, and two sets are symmetrically welded to both sides of the connecting cover 212. One set has a filter element mounting groove on its inner side. The connecting cover 212 and the inner side of the connecting shell 31 are connected through the air hole 213. Both sets of connecting pipes 32 are equipped with spring-loaded check valves (made of 304 stainless steel, with valve discs made of nitrile rubber and spring preload of 3N). The check valves are fixed in series on the inner side of the connecting pipes 32 (near the flange 33) to control the unidirectional flow of air. The two sets of connecting shells 31 and connecting pipes 32 are respectively divided into an air inlet group and an air outlet group: Air intake group: One set of connecting shell 31 (defined as air intake connecting shell 31) has an inner filter element mounting groove that is adapted to the fresh air filter element, the corresponding connecting pipe 32 is the air intake pipe, and the one-way valve is the air intake one-way valve; The exhaust assembly: another set of connecting shell 31 (defined as exhaust connecting shell 31) has an inner filter element mounting groove adapted to the exhaust gas treatment filter element, the corresponding connecting pipe 32 is the exhaust pipe, and the one-way valve is the exhaust one-way valve. The air inlet connection shell 31 and the air outlet connection shell 31 have the same structure and are only distinguished by the filter type and the direction of the one-way valve. The filter replacement unit 4 is only set on the air inlet connection shell 31 (the air outlet connection shell 31 can be selectively set according to the needs. In this embodiment, only the air inlet side needs to be frequently replaced with fresh air filter). The connecting pipe 32 is a stainless steel circular pipe, with one end vertically welded to the center of the connecting shell 31 on the side away from the connecting cover 212; Flange 33 is a stainless steel circular flange 33 disc, welded to the other end of the connecting pipe 32. Bolt holes are provided on flange 33 for docking with the laboratory exhaust system.

[0030] It should be noted that the intake check valve opens and closes as follows: Opening conditions: When the temperature inside the cabinet rises, the air outlet regulating unit opens the air hole 213, and a slight negative pressure is formed inside the cabinet. Outside air flows through the flange 33 and the air inlet pipe to the air inlet connecting shell 31. The airflow pressure is greater than the spring preload of the air inlet one-way valve, which pushes the valve disc to overcome the spring force and open upward, allowing outside air to enter the air inlet connecting shell 31. Closure conditions: When the temperature inside the cabinet decreases, the exhaust regulating unit closes the vent 213, the slight negative pressure inside the cabinet disappears, the spring of the intake one-way valve releases its elastic potential energy, pushes the valve disc downward to reset, tightly fits the valve seat, and blocks the reverse flow of air (preventing contaminated air inside the cabinet from leaking into the laboratory through the intake pipe).

[0031] Opening and closing of the exhaust check valve: Opening conditions: When the temperature inside the cabinet rises, hot air enters the exhaust connection shell 31 through the air hole 213. The airflow pressure is greater than the spring preload of the exhaust one-way valve, which pushes the valve disc to overcome the spring force and open upward. The hot air is introduced into the laboratory exhaust system through the exhaust pipe and flange 33. Closing condition: When the temperature inside the cabinet decreases, the amount of hot air discharged decreases, and the airflow pressure is lower than the spring preload, the spring pushes the valve disc downward to reset, blocking the reverse flow of airflow (preventing outside air from flowing back into the cabinet through the air outlet pipe and disrupting the temperature and humidity balance). The intake and exhaust groups respond synchronously to temperature changes: when the temperature rises, the exhaust one-way valve opens as the hot air pressure increases, and the slight negative pressure inside the cabinet triggers the intake one-way valve to open. Fresh air from the outside is filtered through the intake connection shell 31 and then supplied to the cabinet, while hot air is filtered through the exhaust connection shell 31 and then discharged, forming a closed loop of air exchange of "intake-exhaust". When the temperature drops, both sets of one-way valves close synchronously to maintain stable temperature and humidity inside the cabinet.

[0032] In some embodiments, the filter element replacement unit 4 includes a connecting slide plate 41, a filter element body 42, a positioning hole 43, a positioning slider 44, a second spring 45, and a fastening ball 46. Wherein: Connecting slide plate 41: It is an ABS plastic rectangular plate (the size is adapted to the inside of the air intake connecting shell 31), which is slidably connected to the filter element mounting groove inside the air intake connecting shell 31. The filter element body 42 (adapted to "pre-efficiency + medium-efficiency composite fresh air filter element", used to filter dust, hair and other impurities in the outside air) is fixedly connected to the bottom by bolts. Positioning hole 43 and positioning slider 44: Positioning hole 43 is a rectangular hole, which is opened on both sides of the connecting slide plate 41; positioning slider 44 is an L-shaped stainless steel block, which is slidably connected to the inside of positioning hole 43. An arc-shaped groove is opened on the outer side of the end of the slider away from the connecting slide plate 41 to fit the fastening ball 46. The second spring 45 and the fastening ball 46: The second spring 45 is a stainless steel compression spring, with two sets symmetrically fixed to the inner wall of the air intake connection shell 31 (corresponding to the position of the positioning slider 44). One end of the spring is welded to the inner wall of the air intake connection shell 31, and the other end is welded to the fastening ball 46. The fastening ball 46 is a solid stainless steel ball, which is slidably connected to the spherical groove preset in the inner wall of the air intake connection shell 31, and its outer side is fitted into the arc-shaped groove of the positioning slider 44 to form a locking structure. Dedicated seal on the air intake side: A ring-shaped silicone sealing strip is pasted on the lower edge of the connecting slide plate 41. When the connecting slide plate 41 is fully pushed into the air intake connecting shell 31, the sealing strip fits tightly against the inner wall of the connecting shell 31, preventing unfiltered air from entering the cabinet through the gap.

[0033] It should be noted that when installing a new filter element, the connecting slide plate 41 is aligned with the filter element installation groove of the air intake connection shell 31 and pushed in: when the connecting slide plate 41 slides to the preset position (the positioning slider 44 is aligned with the fastening ball 46), the arc-shaped groove of the positioning slider 44 contacts the fastening ball 46, pushing the fastening ball 46 to compress the second spring 45; continue pushing the connecting slide plate 41 to the limit position, the second spring 45 releases its elastic potential energy, pushing the fastening ball 46 to be fully embedded in the arc-shaped groove, the positioning slider 44 is locked inside the positioning hole 43, and the connecting slide plate 41 cannot slide out by itself, thus completing the filter element installation; at this time, the sealing strip on the lower side of the connecting slide plate 41 is in contact with the inner wall of the air intake connection shell 31, ensuring that the intake air only enters the cabinet after being filtered by the filter element; When replacing the old filter element, hold the outside of the connecting slide plate 41 and apply a pulling force to the outside: the pulling force overcomes the preload of the second spring 45, pushes the fastening ball 46 out of the arc-shaped groove of the positioning slider 44, compresses the second spring 45 and retracts into the spherical slide groove; the positioning slider 44 loses the lock of the fastening ball 46 and can slide along the positioning hole 43 with the connecting slide plate 41. Continue to pull the handle to pull out the connecting slide plate 41 and the filter element body 42 together from the air inlet connecting shell 31; during the disassembly process, the air inlet one-way valve corresponding to the air inlet connecting shell 31 will automatically close because there is no airflow pressure in the cabinet (no air enters the cabinet temporarily during the pulling operation) to prevent unfiltered air from flowing back in; The intake side requires frequent filter replacements. This structure, with its elastic locking via the second spring 45 and the retaining ball 46, allows for easy disassembly and assembly without tools, meeting the high-frequency maintenance needs of the intake side. The exhaust side, however, does not require this complex locking structure due to its low filter replacement frequency; a simple snap-fit ​​is sufficient.

[0034] Working principle or structural principle: Initial state: The fume hood is in standby or initial stage of experimentation. The temperature inside the hood is stable, the volume of the temperature-sensitive mineral oil mixture does not change, the first spring 28 of the reset unit is in a pre-compressed state, driving the piston 22 and the connecting slide rod 23 to the low position; the two sets of baffles 25 of the exhaust regulating unit completely block the air holes 213 of the connecting cover 212, and the exhaust volume is 0; the inlet one-way valve and the outlet one-way valve are both closed due to the lack of airflow pressure, the inside of the hood remains sealed, and outside air is prevented from entering. Temperature rise triggers adjustment: When the experiment generates heat, causing the temperature inside the chamber to rise, the mineral oil mixture in the container 21 expands in volume due to the heat, generating hydraulic thrust that pushes the piston 22 upward along the inner side of the container 21 and the threaded cylinder 27. The piston 22 drives the connecting slide rod 23 to move upward synchronously; the connecting slide rod 23 drives the two sets of baffles 25 to slide upward, gradually opening the vent 213 on the connecting cover 212. The air output increases with the increase of the displacement of the baffle 25, and the hot air inside the chamber enters the connecting shell 31 through the vent 213. On the exhaust side: hot air enters the exhaust connection shell 31, and the airflow pressure overcomes the spring preload of the exhaust one-way valve, pushing the valve disc to open. The hot air is then introduced into the laboratory exhaust system through the exhaust pipe and flange 33 to achieve cooling inside the cabinet. On the intake side: hot air is discharged to create a slight negative pressure inside the cabinet. Outside air flows through flange 33 and intake pipe to intake connection shell 31. The airflow pressure overcomes the spring preload of the intake one-way valve, pushing the valve to open. Outside air is filtered by the fresh air filter element inside the intake connection shell 31 and then replenished into the cabinet, forming a closed loop of air exchange between intake and exhaust, maintaining the air pressure balance inside the cabinet while ensuring the cleanliness of the intake air. Temperature reduction and reset process: When the experiment ends or heat dissipation is completed, the temperature inside the cabinet decreases, the mineral oil mixture cools and contracts, and the hydraulic pressure disappears; the first spring 28 of the reset unit releases elastic potential energy, pushing the connecting ring 29 to move downward, and the connecting ring 29 drives the connecting slide rod 23 and the piston 22 to reset to the low position; the connecting slide rod 23 drives the baffle 25 to slide downward, completely blocking the air hole 213 again, reducing the amount of hot air discharged, and the airflow pressure is lower than the preload of the one-way valve spring. The inlet one-way valve and the outlet one-way valve close synchronously, blocking the reverse flow of airflow, preventing the leakage of contaminated air inside the cabinet or the backflow of outside air, and stabilizing the temperature inside the cabinet within the target range; Filter replacement and power source maintenance: When the fresh air filter on the intake side is saturated and needs to be replaced, hold the outer handle of the connecting slide plate 41 and pull outward to overcome the preload of the second spring 45, causing the fastening ball 46 to disengage from the arc-shaped groove of the positioning slider 44. Pull out the connecting slide plate 41 and the filter body 42, replace the new filter, and push the connecting slide plate 41 back. Under the action of the second spring 45, the fastening ball 46 is embedded in the arc-shaped groove and locked. At the same time, the sealing strip adheres to the inner wall of the intake connecting shell 31 to ensure a seal. When the liquid power source is aged or contaminated, rotate the container 21 clockwise to disengage the sealing threaded collar 26 from the threaded cylinder 27. Remove the container 21, replace the liquid, and retighten to complete the maintenance.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the scope of protection of this invention. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-filter adapter fume hood with temperature and humidity balancing function, characterized in that: The device includes a fume hood body (1), a temperature adaptation and adjustment component (2) is installed on the inner side of the fume hood body (1), the temperature adaptation and adjustment component (2) includes an exhaust regulating unit and a drive unit for driving the exhaust regulating unit, and the temperature adaptation and adjustment component (2) also includes an installation and replacement unit for installing and replacing the drive unit, and the temperature adaptation and adjustment component (2) also includes a reset unit for driving the drive unit to reset, an air inlet and outlet unit (3) is installed on the upper side of the temperature adaptation and adjustment component (2), and a filter replacement unit (4) for replacing the filter element is provided on the air inlet and outlet unit (3).

2. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 1, characterized in that: The drive unit includes a container (21), and a temperature-sensitive liquid power source is placed inside the container (21). The temperature-sensitive liquid power source is a mineral oil mixture with a high expansion coefficient. A piston (22) is attached to and slides inside the container (21). A connecting slide rod (23) is provided on the upper side of the piston (22).

3. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 2, characterized in that: The exhaust regulating unit includes an adjusting groove (24) provided on the connecting slide (23), and the exhaust regulating unit also includes a baffle (25) provided on the end of the connecting slide (23) away from the piston (22). The exhaust regulating unit also includes a connecting cover (212) installed on the upper side of the fume hood body (1), and a partition (211) is connected to the inner side of the connecting cover (212). An air hole (213) is provided on the connecting cover (212).

4. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 3, characterized in that: The installation and replacement unit includes a sealing threaded collar (26) located at the upper end of the container (21), and a threaded cylinder (27) is threadedly connected to the inner side of the sealing threaded collar (26).

5. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 4, characterized in that: The reset unit includes a first spring (28) connected to the upper side of the threaded cylinder (27), and a connecting ring (29) is connected to the end of the first spring (28) away from the threaded cylinder (27). The reset adjustment unit also includes a connecting cylinder (210) installed on the outside of the threaded cylinder (27).

6. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 5, characterized in that: The connecting ring (29) is fixedly set on the outside of the connecting slide rod (23), and the connecting ring (29) is set on the inside of the connecting cylinder (210). The connecting cylinder (210) is fixedly set on the inside of the fume hood body (1) through the connecting plate, and the threaded cylinder (27) is fixedly set on the inside of the connecting cylinder (210).

7. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 6, characterized in that: The piston (22) is slidably connected to the inner side of the container (21) and the threaded cylinder (27), and the connecting rod (23) is slidably connected to the upper middle position of the fume hood body (1). Two sets of baffles (25) are provided and symmetrically arranged at the upper end of the connecting rod (23). At the same time, the baffles (25) are slidably connected to the inner side of the connecting cover (212).

8. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 7, characterized in that: The partition (211) is slidably connected to the inner side of the adjustment groove (24), and the baffle (25) is slidably connected to the outer side of the partition (211) on the side away from the connecting cover (212). The partition (211) is located between the two sets of baffles (25), and several sets of air holes (213) are evenly and symmetrically distributed on both sides of the connecting cover (212).

9. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 8, characterized in that: The air inlet and outlet unit (3) includes a connecting shell (31) installed on the fume hood body (1), a connecting pipe (32) is connected to the middle of one side of the connecting shell (31), and a flange (33) is connected to the end of the connecting pipe (32) away from the connecting shell (31).

10. A multi-filter adapter fume hood with temperature and humidity balancing function according to claim 9, characterized in that: Two sets of connecting shells (31) are symmetrically installed on both sides of the connecting cover (212). The connecting cover (212) is fixedly installed in the middle of the two sets of connecting shells (31). The air hole (213) is correspondingly set with the connecting shell (31).

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