A biosafety cabinet make-up air device with heat recovery function

Abstract

This utility model relates to the field of biosafety cabinet technology, and more particularly to a biosafety cabinet make-up air device with heat recovery function. It includes a biosafety cabinet, an exhaust duct assembly, and a make-up air duct assembly. The air inlet of the exhaust duct assembly is located on one side of the top of the biosafety cabinet, used to exhaust the airflow entering the biosafety cabinet. The air outlet of the make-up air duct assembly is located on the other side of the top of the biosafety cabinet, used to introduce external airflow into the biosafety cabinet. Its purpose is to eliminate the strong pressure disturbances in the laboratory, and even the reversal from absolute negative pressure to absolute positive pressure, caused by the opening or closing of the IIB2 type biosafety cabinet, by adding a make-up air device. This improves the operational stability and safety of the IIB2 type biosafety cabinet in the biosafety laboratory, and maintains stable overall laboratory pressure and compliance with biosafety requirements.

Description

Technical Field

[0001] This utility model relates to the field of biosafety cabinet technology, and in particular to a biosafety cabinet make-up air device with heat recovery function. Background Technology

[0002] Biosafety cabinets are commonly used local purification and protection devices in biosafety laboratories. Their main function is to protect the safety of operators and the surrounding environment. Their working principle involves using a power source to draw in outside air or air from the laboratory's ventilation system, which is then filtered through a high-efficiency particulate air (HEPA) filter before being introduced into the cabinet to prevent sample contamination. Simultaneously, the power source draws in the filtered air from inside the cabinet to expel it into the external environment, maintaining a negative pressure state within the cabinet. This protects experimental samples from external contamination while preventing operators from being exposed to harmful or unknown bioaerosols and splashes generated during experimental procedures.

[0003] Currently, biosafety laboratories typically use Type IIA2 and Type IIB2 biosafety cabinets for pathogenic microorganism experiments. The difference lies in the exhaust airflow. With Type IIA2 cabinets, 70% of the exhaust air is recirculated back into the cabinet cavity (i.e., the work surface), while the remaining 30% is exhausted into the room. In other words, all exhaust air from Type IIA2 cabinets is vented into the laboratory, not outwards. However, when handling samples that may contain unknown infectious agents, or samples using volatile toxic chemicals or radioactive nuclides as auxiliary agents, Type IIB2 biosafety cabinets are typically used. Unlike Type IIA2 cabinets, Type IIB2 cabinets employ a unidirectional fresh air system within the cabinet. This means that 100% of the air intake for Type IIB2 cabinets comes from inside the laboratory, while 100% of the airflow entering the cabinet is exhausted into the room, using a closed-loop connection for external exhaust.

[0004] The IIB2 type biosafety cabinet has a larger exhaust volume (typically 1800-2500 m³ / h). 3 The exhaust volume ( / h) is often equivalent to the exhaust volume of the air supply system in the laboratory room. Therefore, in practical applications, the start-up and shutdown of the IIB2 biosafety cabinet will cause drastic changes in the laboratory's exhaust volume in a short period of time. If the room pressure is not properly controlled, it will have a significant impact on the static pressure difference of the room, and may even lead to air leakage from the biosafety cabinet and a short-term positive pressure relative to the atmosphere in the laboratory. This is absolutely not allowed in biosafety laboratory regulations. The room should always be under negative pressure, and the airflow inside the biosafety cabinet should blow inward in real time, that is, the air pressure inside the biosafety cabinet cavity should also be negative relative to the laboratory. In addition, for smaller rooms, even if the room is opened to the maximum exhaust volume, it may not be enough to support the normal exhaust volume of the IIB2 biosafety cabinet during start-up and operation, causing the biosafety cabinet to fail to operate normally, thus creating safety hazards for personnel and the environment. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a biosafety cabinet make-up air device with heat recovery function. By adding the make-up air device, the laboratory pressure disturbance caused by the opening or closing of the IIB2 biosafety cabinet can be eliminated, thereby improving the operational stability and safety of the IIB2 biosafety cabinet in the biosafety laboratory, and maintaining the overall pressure of the laboratory to be stable and in compliance with biosafety requirements.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] A biosafety cabinet make-up air device with heat recovery function includes a biosafety cabinet, an exhaust duct assembly and a make-up air duct assembly. The air inlet of the exhaust duct assembly is located on one side of the top of the biosafety cabinet to exhaust the airflow entering the biosafety cabinet. The air outlet of the make-up air duct assembly is located on the other side of the top of the biosafety cabinet to introduce external airflow into the biosafety cabinet.

[0008] The make-up air duct assembly includes a make-up air duct and a control component. One end of the make-up air duct is connected to the top of the biosafety cabinet, and the other end is connected to the technical interlayer. It is used to introduce airflow from outside the laboratory air supply system into the biosafety cabinet. The control component is mounted on the make-up air duct and is used to control the working status of the make-up air duct.

[0009] Furthermore, the control component includes a regulating valve and a shut-off valve. The regulating valve is located at the end of the air supply pipe away from the biosafety cabinet, and the shut-off valve is located at the end of the air supply pipe close to the biosafety cabinet.

[0010] Based on the aforementioned technical means, the flow rate of gas entering the make-up air duct can be adjusted by installing a regulating valve. A sealing valve is installed to protect the airtightness of the laboratory and prevent the leakage of any pathogenic microorganism aerosols that may be generated within the laboratory.

[0011] Furthermore, the regulating valve includes a second manual regulating valve and a second constant air volume regulating valve. The second manual regulating valve is located at one end of the make-up air pipe away from the airtight valve, and the second constant air volume regulating valve is located between the airtight valve and the second manual regulating valve.

[0012] Based on the above technical means, the resistance coefficient of the entire make-up air pipeline can be initially adjusted by setting a manual regulating valve; and the airflow of the make-up air pipeline can be controlled by setting a constant air volume regulating valve.

[0013] Furthermore, the make-up air duct assembly also includes a filter, which is installed at the air inlet of the make-up air duct.

[0014] Based on the above technical means, filters are installed to block impurities in the air, such as large-diameter dust and debris in the technical interlayer, so as to prevent impurities from entering the air supply duct.

[0015] Furthermore, the air supply equipment also includes a heat exchange mechanism, which is installed on the exhaust duct assembly and the air supply duct assembly.

[0016] Based on the above technical means, by setting up a heat exchange mechanism, heat exchange can be carried out on the airflow discharged from the biosafety cabinet and the airflow introduced, thereby improving the thermal comfort of the biosafety cabinet operating area, avoiding the direct introduction of air from the technical interlayer which would cause overheating in summer and freezing hands in winter, and thus reducing the energy consumed in processing the introduced airflow into the laboratory environment.

[0017] Furthermore, the heat exchange mechanism includes a housing and a heat exchange assembly. The heat exchange assembly is disposed inside the housing, and the exhaust duct assembly and the make-up air duct assembly both extend out of the heat exchange assembly for heat exchange of the airflow passing through the exhaust duct assembly and the make-up air duct assembly.

[0018] Based on the above-mentioned technical means, heat exchange efficiency can be improved by exchanging heat between the exhaust airflow and the introduction airflow within the heat exchange component.

[0019] Furthermore, the heat exchange assembly includes a first mounting shell, a second mounting shell, a clamping member, and a hot and cold circulation pipeline. A first wavy channel is provided on one side of the first mounting shell, and a second wavy channel is provided on one side of the second mounting shell. The exhaust duct extends through the first wavy channel, and the make-up air duct extends through the second wavy channel. The clamping member is pressed against the first and second wavy channels. A first receiving cavity is opened on one side of the first mounting shell, and a second receiving cavity is opened on one side of the second mounting shell. The hot and cold circulation pipeline is located in the first and second receiving cavities and contacts the exhaust duct and the make-up air duct.

[0020] The above-mentioned technical methods can further improve heat exchange efficiency.

[0021] Furthermore, the middle part of both the first and second wavy channels is set to be hollow, the exhaust pipe group and the air supply pipe are located on one side of the hollow shape, and the hot and cold circulation pipe is located on the other side of the hollow shape and is in contact with the exhaust pipe group and the air supply pipe.

[0022] Based on the above technical means, the hollow design facilitates contact between the hot and cold circulation pipes and the make-up air pipes and exhaust air pipes, thereby helping to accelerate the heat exchange rate.

[0023] Furthermore, the clamping component includes a frame and a clamping part, the frame is disposed on the clamping part, and the two sides of the clamping part are respectively attached to the first wavy channel and the second wavy channel.

[0024] According to the above technical means, by using a pressing part to press the air supply pipe and the exhaust pipe together with the first and second wavy channels, it is beneficial to the heat exchange of the hot and cold circulation pipes.

[0025] Furthermore, the clamping part is filled with a phase change material.

[0026] Based on the above-mentioned technical means, heat exchange efficiency can be further improved by filling with phase change materials.

[0027] The present application, employing the above-described scheme, has at least the following beneficial effects:

[0028] 1. In this application, by adding a make-up air duct assembly to the IIB2 type biosafety cabinet, in conjunction with the exhaust air duct assembly on the IIB2 type biosafety cabinet, the laboratory pressure disturbance problem caused by the opening or closing of the IIB2 type biosafety cabinet can be eliminated, thereby improving the operational stability and safety of the IIB2 type biosafety cabinet in the biosafety laboratory.

[0029] 2. In this application, by setting up heat exchange mechanisms at the air supply duct assembly and the air exhaust duct assembly, heat exchange can be performed on the airflow discharged from the biosafety cabinet and the airflow introduced, thereby improving the thermal comfort of the biosafety cabinet operating area, avoiding overheating in summer and freezing hands in winter, and thus reducing the energy consumed to process the introduced airflow to the normal state in the laboratory, achieving the effect of reducing energy consumption.

[0030] 3. In this application, the airflow of the make-up air duct group and the exhaust air duct group do not come into direct contact within the heat exchange mechanism. At the same time, the airflow sources of the make-up air duct group and the exhaust air duct group do not come into direct contact, thereby reducing the risk of cross-infection of pathogenic microorganisms. Attached Figure Description

[0031] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0032] Figure 1 This is a schematic diagram of the structure of a biosafety cabinet make-up air device with heat recovery function according to this utility model;

[0033] Figure 2 This is a partial structural schematic diagram of a biosafety cabinet make-up air device with heat recovery function according to this utility model;

[0034] Figure 3 This is a schematic diagram of the heat exchange mechanism in this utility model;

[0035] Figure 4 This is a cross-sectional view of the heat exchange mechanism in this utility model;

[0036] Figure 5 This is an exploded view of the heat exchange mechanism in this utility model;

[0037] The components include: 1. Biosafety cabinet; 11. Working window; 12. First passageway; 13. Second passageway; 14. First supply air HEPA filter; 15. Second supply air HEPA filter; 16. Flow equalization fan; 17. Exhaust duct; 171. First manual regulating valve; 172. First constant air volume regulating valve; 173. First biosafety airtight valve; 2. Makeup air duct assembly; 21. Makeup air duct; 22. Regulating valve; 221. Second manual regulating valve; 222. Second constant air volume regulating valve. 23. Sealing valve; 24. Filter; 3. Heat exchange mechanism; 31. Housing; 32. Heat exchange assembly; 33. First mounting shell; 331. First corrugated channel; 332. First receiving cavity; 34. Second mounting shell; 341. Second corrugated channel; 342. Second receiving cavity; 35. Fixing plate; 36. Clamping element; 361. Frame; 362. Clamping part; 37. Hot and cold circulation pipeline; 371. Circulation pipe; 372. Branch pipe; 4. Laboratory roof. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0039] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting the present utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. In the description of this application, terms such as "first", "second", etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0041] like Figure 1 As shown, this utility model discloses a make-up air device for a biosafety cabinet 1 with heat recovery function, comprising a biosafety cabinet 1, an exhaust duct assembly, and a make-up air duct assembly 2. The air inlet of the exhaust duct assembly is located on one side of the top of the biosafety cabinet 1, for discharging the airflow entering the biosafety cabinet 1. The air outlet of the make-up air duct assembly 2 is located on the other side of the top of the biosafety cabinet 1, for introducing external airflow into the biosafety cabinet 1.

[0042] In this embodiment, as Figure 1 and Figure 2 As shown, the IIB2 type biosafety cabinet 1 has a working window 11. Below the working window 11, there is a first passageway 12, and behind the working window 11, there is a second passageway 13. The first passageway 12 and the second passageway 13 are connected. The IIB2 type biosafety cabinet 1 is equipped with a first supply air HEPA filter 14 at the second passageway 13. The exhaust duct assembly is located at the top of the IIB2 type biosafety cabinet 1 and is connected to the space where the first supply air HEPA filter 14 is located, so that the airflow can be filtered by the first supply air HEPA filter 14 and then discharged through the exhaust duct assembly. Above the working window 11, there is a second supply air HEPA filter 15. The make-up air duct assembly 2 is located at the top of the IIB2 type biosafety cabinet 1 and is connected to the space where the second supply air HEPA filter 15 is located, so that the airflow can be introduced into the IIB2 type biosafety cabinet 1 through the make-up air duct assembly 2, and then filtered by the second supply air HEPA filter 15, so that the airflow can enter the working window 11 and the laboratory. To improve the uniformity of the introduced airflow, a flow equalization fan 16 is installed at the top of the IIB2 type biosafety cabinet 1, at the air outlet of the make-up air duct assembly 2. In this embodiment, the above description introduces the IIB2 type biosafety cabinet 1. The IIB2 type biosafety cabinet 1 itself is prior art, and the above description is used to describe the general working principle of the IIB2 type biosafety cabinet 1.

[0043] In this embodiment, as Figure 1 and Figure 2As shown, the exhaust duct assembly includes an exhaust duct 17, a first manual regulating valve 171, a first constant air volume regulating valve 172 (CAV), and a first biosafety shut-off valve 173 (BED). One end of the exhaust duct 17 is connected to the top of the IIB2 biosafety cabinet 1 and communicates with the space where the first supply air high-efficiency filter 14 is located. The other end extends out of the laboratory roof and communicates with the exhaust duct of the fresh air system or a separate exhaust fan, allowing airflow to be exhausted. The first manual regulating valve 171 is located on the exhaust duct 17 away from the IIB2 biosafety cabinet 1 and is used to adjust the resistance coefficient of the exhaust duct 17. The first biosafety shut-off valve 173 is located on the exhaust duct 17 close to the IIB2 biosafety cabinet 1 and is used to protect the airtightness of the laboratory and prevent the leakage of pathogenic microorganism aerosols that may be generated in the laboratory. The first constant air volume regulating valve 172 is located between the first manual regulating valve 171 and the first biosafety shut-off valve 173 and is used to regulate the airflow. The exhaust duct assembly in this embodiment is integrated into the IIB2 type biosafety cabinet 1. The above description is used to introduce the working principle of the exhaust duct assembly.

[0044] In some embodiments, such as Figure 1 and Figure 2 As shown, the make-up air duct assembly 2 includes a make-up air duct 21 and a control assembly. One end of the make-up air duct 21 is connected to the top of the biosafety cabinet 1, and the other end extends through the laboratory roof and connects to the technical mezzanine, used to introduce airflow from outside the laboratory air supply system into the biosafety cabinet 1. The air in the technical mezzanine is from a normal indoor space, separate from the air within the laboratory air supply system, and does not contain pathogenic microorganisms. The technical mezzanine space is large, and the air source is mostly from reserved indoor and outdoor ventilation openings or infiltration through gaps in the space, sufficient to provide make-up air for the biosafety cabinet without causing changes in the static pressure within the technical mezzanine. The control assembly is mounted on the make-up air duct 21 and is used to control the operating status of the make-up air duct 21.

[0045] In this embodiment, by adding an independent make-up air duct group 2, the laboratory pressure disturbance problem caused by the opening or closing of the IIB2 type biosafety cabinet 1 can be eliminated.

[0046] In this embodiment, the control components include a second manual regulating valve 221, a second constant air volume regulating valve 222, and a shut-off valve 23. The second manual regulating valve 221 is located at one end of the make-up air pipe 21 away from the shut-off valve 23. The second constant air volume regulating valve 222 is located between the shut-off valve 23 and the second manual regulating valve 221. The shut-off valve 23 is located at one end of the make-up air pipe 21 near the biosafety cabinet 1.

[0047] In one specific implementation, the air inlet of the make-up air duct 21 is also provided with a filter 24. The filter 24 can be a G3 or G4 coarse duct filter 24, which is used to block impurities in the introduced air, such as large-diameter dust, debris in the technical interlayer, etc., to prevent impurities from entering the make-up air duct 21.

[0048] In some implementations, the second manual regulating valve 221 is primarily used to determine the resistance coefficient of the entire make-up air duct 21 during initial adjustment. The second constant air volume regulating valve 222 (CAV) is used to control the airflow in the make-up air duct 21. During the startup process of the IIB2 biosafety cabinet 1, the constant make-up airflow equals the required exhaust airflow. During normal operation of the IIB2 biosafety cabinet 1, the constant make-up airflow equals the exhaust airflow minus the inflow at the working window 11 (ensuring an average surface velocity of 0.5 m / s at the working window 11). When the IIB2 biosafety cabinet 1 is closed, constant airflow is not required; it is sufficient to meet the natural flow rate during the exhaust fan shutdown process.

[0049] The second biosafety shut-off valve 23 is used to protect the airtightness of the laboratory and prevent the leakage of pathogenic microorganism aerosols that may be generated in the laboratory. When the IIB2 biosafety cabinet 1 is opened and operating normally, the second biosafety shut-off valve 23 is open; when the IIB2 biosafety cabinet 1 is closed, the second biosafety shut-off valve 23 closes.

[0050] Specifically, the air inlet of the make-up air duct 21 is directly connected to the technical mezzanine (outside the laboratory air supply system). When the IIB2 biosafety cabinet 1 is started, the second biosafety shut-off valve (BED) and the second constant air volume regulating valve 222 (CAV) on the make-up air duct 21 are opened simultaneously. At this time, the opening degree of the CAV on the make-up air duct 21 and the CAV on the exhaust duct 17 are adjusted to be the same (i.e., the air volume is the same). At the same time as the IIB2 biosafety cabinet 1 starts, an equal amount of air is injected through the make-up air duct 21. This instantly makes up for the air volume lost in the laboratory due to the opening of the IIB2 biosafety cabinet 1, eliminating the dependence of the IIB2 biosafety cabinet 1 on the adjustment of the laboratory air supply (or exhaust) system at the moment of startup, and preventing drastic pressure fluctuations in the room.

[0051] Operating Status: When the exhaust system and built-in flow equalization fan 16 of the IIB2 biosafety cabinet 1 reach the operating status point, the CAV of the make-up air duct 21 is slightly closed, i.e., its airflow is appropriately reduced (the appropriate airflow can be obtained through pre-calculation), resulting in the airflow of the make-up air duct 21 being slightly less than that of the exhaust main airflow. At this time, the IIB2 biosafety cabinet 1 will supplement the airflow by drawing air from the working window 11. Through the built-in wind speed monitoring device of the IIB2 biosafety cabinet 1 (standard configuration), when the average flow velocity of the working window 11 reaches 0.5 m / s, the IIB2 biosafety cabinet 1 reaches the normal operating status and can operate. In this state, the majority of the make-up air of the IIB2 biosafety cabinet 1 comes from the make-up air duct 21 of this application, and a small portion comes from the laboratory (i.e., entering through the working window 11). Therefore, the room pressure will decrease slightly, but the supply and exhaust air of the laboratory does not need to be adjusted, and the laboratory operating status is still met. Alternatively, you can slightly adjust the room pressure difference by only slightly reducing the room exhaust volume (or only slightly increasing the supply volume).

[0052] When the IIB2 biosafety cabinet 1 is closed, the operator typically closes the working window 11 first. At this time, the exhaust duct of the IIB2 biosafety cabinet 1 still draws air (due to the inertia of the built-in exhaust fan or the valve not being fully closed). During this period, the make-up air duct 21 continues to provide make-up air to balance the pressure during the closure process. Once the biosafety shut-off valve 23 and the constant air volume control valve on the exhaust duct 17 gradually close, the make-up air duct 21 also stops operating. At this point, the CAV and BED on the make-up air duct 21 are then shut down. During the shutdown process, there are no pressure fluctuations in the room. This eliminates the laboratory pressure disturbance caused by the opening or closing of the IIB2 biosafety cabinet 1.

[0053] In this embodiment, the working principle of the IIB2 type biosafety cabinet 1 is as follows: IIB2 type biosafety cabinet 1 starts up – the automatic control system receives the opening signal of IIB2 type biosafety cabinet 1 – the biosafety airtight valve and constant air volume valve on the exhaust pipe 17 and the make-up air pipe 21 of IIB2 type biosafety cabinet 1 open simultaneously (if an exhaust fan is connected to the exhaust pipe 17, it starts up) – the automatic control system monitors the room pressure, but because of the presence of the make-up air pipe 21, the room does not need to adjust the supply or exhaust air; natural air supply through the make-up air pipe 21 is sufficient – ​​the exhaust fan of IIB2 type biosafety cabinet 1 gradually adjusts until it stabilizes – at this time, the pressure on the make-up air pipe 21 is adjusted... The constant air volume regulating valve is partially closed (the valve opening can be calculated beforehand; the control variable is that the average airflow inflow through working window 11 reaches 0.5 m / s). Once the average airflow inflow through working window 11 of the IIB2 biosafety cabinet reaches 0.5 m / s (this can be monitored by the cabinet's built-in wind speed sensor or obtained through pre-calculation), normal operation is possible. During this process, the automatic control system monitors the room pressure but does not need to adjust the supply or exhaust air volume. The room pressure will not change drastically; only when the constant air volume control valve of the make-up air pipe 21 is adjusted will the room pressure drop slightly. At this point, the supply or exhaust air volume does not need to be adjusted, or only minor adjustments are needed. However, there will never be drastic room pressure fluctuations, nor will there be excessive positive or negative pressure. The automatic control system and signal control in this embodiment are all existing technologies.

[0054] Compared to the existing IIB2 type biosafety cabinet 1, which requires coordination of multiple automatic control points such as the room's supply fan frequency converter, exhaust valve adjustment, biosafety cabinet 1 start / stop signals, and valve actions on the exhaust duct 17 of biosafety cabinet 1 when opened, resulting in complex logic and a high failure rate, this application only requires adding one make-up air duct 21 to the IIB2 type biosafety cabinet 1, which can greatly reduce the logical complexity of the entire laboratory automation system.

[0055] In some embodiments, such as Figure 1 As shown, the make-up air equipment also includes a heat exchange mechanism 3, which is installed on the exhaust duct assembly and the make-up air duct assembly 2. By installing the heat exchange mechanism 3, heat exchange can be performed on the airflow exhausted from the biosafety cabinet 1 and the airflow introduced, thereby improving the thermal comfort of the operating area of ​​the biosafety cabinet 1, avoiding overheating in summer and freezing hands in winter, and reducing the energy consumed in processing the introduced airflow into the laboratory environment.

[0056] In one specific embodiment, the heat exchange mechanism 3 includes a housing 31 and a heat exchange component 32. The heat exchange component 32 is disposed within the housing 31, and both the exhaust duct 17 and the make-up air duct 21 extend through the heat exchange component 32 for heat exchange with the airflow passing through the exhaust duct 17 and the make-up air duct 21. In this embodiment, the heat exchange component 32 is made of a phase change material, which fills the housing 31. The exhaust duct 17 and the make-up air duct 21 intersect within the phase change material, thereby allowing the airflows of different temperatures in the exhaust duct 17 and the make-up air duct 21 to absorb or release heat through the phase change material. This balances the airflow temperatures in the exhaust duct 17 and the make-up air duct 21 as much as possible, ensuring that the temperature of the airflow introduced through the make-up air duct 21 is not significantly different from the temperature inside the laboratory. This improves the thermal comfort of the working window 11 of the biosafety cabinet 1, preventing overheating in summer and freezing temperatures in winter.

[0057] In this embodiment, the phase change material can be paraffin, sodium sulfate decahydrate, etc., and those skilled in the art can select according to the actual situation.

[0058] In another implementation, such as Figures 3-5 As shown, the heat exchange assembly 32 includes a first mounting shell 33, a second mounting shell 34, a clamping member 36, and a hot and cold circulation pipeline 37. A first wavy channel 331 is provided on one side of the first mounting shell 33, and a second wavy channel 341 is provided on one side of the second mounting shell 34. The middle portions of both the first and second wavy channels 331 and 341 are hollowed out. An exhaust pipe 17 extends through the first wavy channel 331, and a make-up air pipe 21 extends through the second wavy channel 341. The clamping member 36 presses against the first and second wavy channels 331 and 341, ensuring that the exhaust pipe 17 and make-up air pipe 21 are tightly fitted together. This increases the length of the exhaust pipe 17 and make-up air pipe 21 within the first and second mounting shells 33 and 34, thereby increasing the residence time of the airflow within the first and second mounting shells 33 and 34, which is more conducive to heat exchange.

[0059] In this embodiment, a first receiving cavity 332 is provided on one side of the first mounting shell 33, and a second receiving cavity 342 is provided on one side of the second mounting shell 34. The hot and cold circulation pipe 37 is disposed at the first receiving cavity 332 and the second receiving cavity 342, and contacts the exhaust pipe 17 and the air supply pipe 21 in the hollowed-out area, so that the liquid in the hot and cold circulation pipe 37 can more efficiently exchange heat with the airflow in the exhaust pipe 17 and the air supply pipe 21.

[0060] In this embodiment, a fixing plate 35 is provided at both the first receiving cavity 332 and the second receiving cavity 342. The fixing plate 35 is used to tightly attach the hot and cold circulation pipe 37 to the exhaust pipe 17 and the air supply pipe 21 in the hollowed-out area, which is more conducive to heat exchange.

[0061] In this embodiment, the hot and cold circulation pipeline 37 includes a circulation pipe 371, a water tank (not shown), and a branch pipe 372. A water pump is installed in the water tank to pump the liquid in the water tank into the circulation pipe 371 through the branch pipe 372. After passing through the first receiving cavity 332 and the second receiving cavity 342, the liquid in the circulation pipe 371 returns to the water tank, thus achieving circulating heat exchange. The water pumps are all existing technologies and are electrically connected to the automatic control system, which can control their operating status.

[0062] In this embodiment, the circulation pipe 371 includes a first circulation pipe 371 and a second circulation pipe 371. The liquid inlet ends of the first circulation pipe 371 and the second circulation pipe 371 are connected to the branch pipe 372. The first circulation pipe 371 and the second circulation pipe 371 are closely attached to both sides of the make-up air pipe 21 in the first receiving cavity 332, and the first circulation pipe 371 and the second circulation pipe 371 are closely attached to both sides of the exhaust pipe 17 in the second receiving cavity 342, thereby improving the heat exchange effect.

[0063] In this embodiment, a first temperature sensor is installed on the supply air duct 21 to detect the temperature of the airflow entering the supply air duct 21. A second temperature sensor is installed on the exhaust air duct 17 to monitor the temperature of the airflow entering the exhaust air duct 17. Both the first and second temperature sensors are electrically connected to the automatic control system. After monitoring the airflow temperatures in the supply air duct 21 and the exhaust air duct 17, the system controls the water pump to send liquid through the circulation pipe 371 through the exhaust air duct 17, allowing the airflow in the exhaust air duct 17 to heat or cool the liquid. The heated or cooled liquid then travels through the circulation pipe 371 to the supply air duct 21 to heat or cool the airflow in the supply air duct 21. This ensures that the airflow temperature in the supply air duct 21 is as close as possible to the temperature inside the laboratory, preventing overheating in the working window 11 during summer and freezing to the touch in the working window 11 during winter.

[0064] In this embodiment, the clamping member 36 includes a frame 361 and a clamping part 362. The frame 361 is disposed on the clamping part 362, and the two sides of the clamping part 362 are respectively fitted to the shapes of the first wavy channel 331 and the second wavy channel 341, so that the exhaust pipe 17 and the air supply pipe 21 can be tightly fitted to the hollow first wavy channel 331 and the second wavy channel 341. In order to facilitate the liquid in the circulation pipe 371 to further heat or cool the airflow in the air supply pipe 21, the clamping part 362 can be filled with a phase change material, such as paraffin wax, sodium sulfate decahydrate, etc., thereby improving the heat exchange efficiency.

[0065] Specifically, for example, in summer, the air temperature inside the technical interlayer can reach 30°C to 35°C or even higher, while in winter, without heating, the air temperature inside the technical interlayer can drop to 10°C to 15°C. The air drawn out of the laboratory through exhaust duct 17 is generally 21°C to 23°C. The water tank is located inside the laboratory. The liquid inside the tank is water, with a temperature of 21-23℃. In summer, when the air temperature in the exhaust duct 17 is 21-23℃, the water temperature remains relatively constant when it comes into contact with the exhaust duct 17. However, when it comes into contact with the make-up air duct 21, it cools the make-up air duct 21, thus cooling the airflow within it (30-35℃). In winter, when the air temperature in the duct is 21-23℃, the water temperature remains relatively constant when it comes into contact with the exhaust duct 17. However, when it comes into contact with the make-up air duct 21, it heats the airflow within it (10-15℃). With the addition of the phase change material in the clamping part 362, the temperature inside the make-up air duct 21 will be even closer to the laboratory's 21-23℃. This reduces the energy consumed in processing the introduced airflow to normal laboratory conditions, achieving energy conservation.

[0066] The above provides a detailed description of a biosafety cabinet make-up air device with heat recovery function provided in this application. The specific embodiments are described only to help understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0067] It should be noted that the terms "one embodiment," "embodiment," "some alternative embodiments," "exemplary embodiments," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0068] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A biosafety cabinet make-up air device with heat recovery function, characterized in that: It includes a biosafety cabinet (1), an exhaust duct assembly and a make-up air duct assembly (2). The air inlet of the exhaust duct assembly is located on one side of the top of the biosafety cabinet (1) to exhaust the airflow entering the biosafety cabinet (1). The air outlet of the make-up air duct assembly (2) is located on the other side of the top of the biosafety cabinet (1) to introduce external airflow into the biosafety cabinet (1). The make-up air duct assembly (2) includes a make-up air duct (21) and a control component. One end of the make-up air duct (21) is connected to the top of the biosafety cabinet (1), and the other end is connected to the technical interlayer. It is used to introduce airflow from outside the laboratory air supply system into the biosafety cabinet (1). The control component is mounted on the make-up air duct (21) and is used to control the working status of the make-up air duct (21).

2. The biosafety cabinet make-up air device with heat recovery function according to claim 1, characterized in that: The control components include a regulating valve (22) and a shut-off valve (23). The regulating valve (22) is located at one end of the make-up air pipe (21) away from the biosafety cabinet (1), and the shut-off valve (23) is located at one end of the make-up air pipe (21) close to the biosafety cabinet (1).

3. The biosafety cabinet make-up air device with heat recovery function according to claim 2, characterized in that: The regulating valve (22) includes a second manual regulating valve (221) and a second constant air volume regulating valve (222). The second manual regulating valve (221) is located at one end of the make-up air pipe (21) away from the airtight valve (23), and the second constant air volume regulating valve (222) is located between the airtight valve (23) and the second manual regulating valve (221).

4. The biosafety cabinet make-up air device with heat recovery function according to any one of claims 1-3, characterized in that: The make-up air duct assembly (2) also includes a filter (24), which is installed at the air inlet of the make-up air duct (21).

5. The biosafety cabinet make-up air device with heat recovery function according to any one of claims 1-3, characterized in that: The air supply equipment also includes a heat exchange mechanism (3), which is installed on the exhaust pipe group and the air supply pipe group (2).

6. The biosafety cabinet make-up air device with heat recovery function according to claim 5, characterized in that: The heat exchange mechanism (3) includes a housing (31) and a heat exchange assembly (32). The heat exchange assembly (32) is disposed inside the housing (31). The exhaust pipe group and the make-up air pipe group (2) both extend out of the heat exchange assembly (32) and are used to exchange heat with the airflow passing through the exhaust pipe group and the make-up air pipe group (2).

7. The biosafety cabinet make-up air device with heat recovery function according to claim 6, characterized in that: The heat exchange assembly (32) includes a first mounting shell (33), a second mounting shell (34), a clamping member (36), and a hot and cold circulation pipeline (37). A first wavy channel (331) is provided on one side of the first mounting shell (33), and a second wavy channel (341) is provided on one side of the second mounting shell (34). The exhaust pipe group extends out of the first wavy channel (331), and the air supply pipe (21) extends out of the second wavy channel (341). The clamping member (36) is pressed against the first wavy channel (331) and the second wavy channel (341). A first receiving cavity (332) is opened on one side of the first mounting shell (33), and a second receiving cavity (342) is opened on one side of the second mounting shell (34). The hot and cold circulation pipeline (37) is located at the first receiving cavity (332) and the second receiving cavity (342) and is in contact with the exhaust pipe group and the air supply pipe (21).

8. The biosafety cabinet make-up air device with heat recovery function according to claim 7, characterized in that: The middle part of the first wave-shaped channel (331) and the second wave-shaped channel (341) is set as a hollow shape. The exhaust pipe group and the air supply pipe (21) are located on one side of the hollow shape, and the hot and cold circulation pipe (37) is located on the other side of the hollow shape and is in contact with the exhaust pipe group and the air supply pipe (21).

9. The biosafety cabinet make-up air device with heat recovery function according to claim 7, characterized in that: The clamping member (36) includes a frame (361) and a clamping part (362). The frame (361) is disposed on the clamping part (362), and the two sides of the clamping part (362) are respectively attached to the first wave-shaped channel (331) and the second wave-shaped channel (341).

10. The biosafety cabinet make-up air device with heat recovery function according to claim 9, characterized in that: The clamping part (362) is filled with a phase change material.

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