Biochemical incubator for experiment with constant temperature function

Abstract

The application discloses a biochemical incubator with a constant temperature function, and relates to the technical field of incubators, which comprises a box body and a constant temperature mechanism, wherein a box door is arranged on the box body; the constant temperature mechanism comprises a temperature controller, a refrigeration system, a heating system, a main air duct, a circulating fan, an air outlet box and an adjusting assembly; the adjusting assembly comprises a supplementary air duct, an air volume shunt valve, a hard air guide hose and an air curtain air outlet piece; the main air duct, the air outlet box, the supplementary air duct, the air volume shunt valve, the hard air guide hose and the air curtain air outlet piece are used in cooperation, so that the inductive switch is linked, the constant temperature air curtain is triggered immediately when the box door is opened, the air curtain is formed by constant temperature air in the box, the inflow of external cold air or hot air is effectively isolated, the outflow of the constant temperature air in the box is reduced, the supplementary air duct supplements the slightly lost heat after the door is closed, the adverse effect of temperature fluctuation on the activity of experimental samples is avoided, and the use effect of the biochemical incubator is improved.

Description

Technical Field

[0001] This invention belongs to the field of incubator technology, specifically relating to a laboratory biochemical incubator with constant temperature function. Background Technology

[0002] An incubator is a chamber device that can precisely control the environmental conditions inside the chamber. It is mainly used to simulate the in vivo environment or specific natural environment to support the in vitro culture and research of microorganisms, cells, tissues, plants, etc. Laboratory biochemical incubators are high-precision environmental control devices for laboratory use. Their core function is to achieve precise and stable temperature control inside the chamber through a two-way temperature regulation system of cooling and heating. They are mainly used in experimental scenarios such as biochemical reactions, microbial culture, and plant cultivation that require low-temperature or constant-temperature environments. They simulate the in vivo environment or specific natural environment to provide a stable growth / reaction environment for samples such as microorganisms, cells, tissues, and plants. They need to achieve constant temperature control below or above room temperature. Therefore, a laboratory biochemical incubator with constant temperature function is needed.

[0003] Existing biochemical incubators with constant temperature function often require opening the incubator door to take out or put in samples. However, this operation can trigger a thermodynamic coupling effect inside the incubator, allowing cold or hot air from the outside to rush in, causing the constant-temperature air inside the incubator to leak out and resulting in drastic temperature fluctuations. After closing the door, the cooling or heating system needs to run at high load to restore the set temperature. This process not only increases the energy loss rate but also prolongs the recovery time of the constant-temperature air inside the incubator, seriously affecting experimental efficiency and sample viability, and failing to meet people's needs. Summary of the Invention

[0004] The purpose of this invention is to provide a laboratory biochemical incubator with a constant temperature function, thereby solving the technical problem in related technologies where opening the door of the biochemical incubator to take out or put in samples causes the constant temperature air inside the biochemical incubator to leak out, resulting in drastic temperature fluctuations, and requiring the refrigeration or heating system to run at high load to restore the set temperature after the door is closed.

[0005] To achieve the above objectives, this invention provides a biochemical incubator for laboratory use with a constant temperature function, comprising: an incubator body and a constant temperature mechanism disposed inside the incubator body; the incubator body is provided with a sealable door, and a placement cavity is provided on the front side of the interior of the incubator body; the constant temperature mechanism includes a temperature controller disposed inside the incubator body, a refrigeration system and a heating system connected to the temperature controller, and a main air duct disposed inside the incubator body and a circulating fan disposed inside the main air duct; symmetrical air outlet boxes communicating with the placement cavity are disposed on the inner side of the incubator body, and the air outlet boxes are connected to the main air duct... The main air duct is connected to the air outlet box, which has several downward-sloping air outlets. The lower side of the placement cavity has an air inlet connected to the main air duct. Both the refrigeration and heating systems are located inside the lower side of the main air duct. The refrigeration system includes a compressor, evaporator, condenser, and expansion valve. The heating system includes several evenly arranged stainless steel electric heating tubes, a heating relay connected to the stainless steel electric heating tubes, and a fuse. The temperature control mechanism also includes an adjustment component located on the door and connected to the main air duct. The adjustment component includes a makeup air duct located inside the door. An airflow diversion valve is installed inside the enclosure and connected to the main air duct, along with a rigid air guide hose connecting the makeup air duct to the airflow diversion valve. An air curtain outlet is inclinedly installed on the makeup air duct. The airflow diversion valve is electrically controlled. The enclosure is equipped with a sensor switch for use with the enclosure door. The sensor switch is located at the hinge side of the enclosure and door, with a sensing distance of 5mm. It is triggered immediately when the door is opened ≥5mm and reset immediately when closed. The sensor switch is connected in series with the temperature controller of the circulating fan and the electromagnetic switch of the airflow diversion valve, and the sensing signal is directly transmitted to the temperature controller. The controller automatically switches the fan speed and airflow diversion valve. When the box door is opened, the circulating fan immediately switches to medium speed, and the airflow diversion valve automatically opens, allowing 30% of the airflow in the main air duct to enter the makeup air duct. The remaining airflow maintains normal circulation within the box. The makeup air duct and the air curtain outlet work together to blow out a constant temperature airflow, forming a constant temperature air curtain between the box door and the box body. This prevents hot and cold air from entering the box body and reduces the leakage of constant temperature air from the box body. When the box door is closed, the airflow diversion valve closes, and the makeup air duct runs at a low speed for three minutes to quickly replenish the slight loss of constant temperature air within the box body.

[0006] According to one aspect, the make-up air duct is configured with a U-shaped structure. The constant temperature mechanism further includes a double-layer insulation interlayer disposed on the outside of the main air duct, the air outlet box, and the make-up air duct to reduce energy loss. The adjustment component also includes a pressure equalization pipe disposed inside the cabinet door and fixedly connected to the make-up air duct. The pressure equalization pipe has a pressure equalization chamber inside that communicates with the make-up air duct. One end of the pressure equalization pipe is connected to one end of a rigid air guide hose. The make-up air duct has a pressure equalization perforated plate inside. The pressure equalization perforated plate includes a plurality of ventilation holes arranged in a triangular array. The pressure equalization perforated plate extends along the cavity of the make-up air duct. The pressure equalization perforated plate is disposed on the side of the make-up air duct near the air curtain outlet. At the corner of the section, there is an arc-shaped guide rib for guiding the smooth flow of air. The side of the supplementary air duct near the air curtain outlet has several parallel shaped guide grooves. The air curtain outlet has a narrow slit outlet that works in conjunction with the parallel shaped guide grooves. The inner wall of the far end of the supplementary air duct has a static pressure return micro-groove that is connected to the pressure equalization pipe. The static pressure return micro-groove serves as a pressure compensation unit at the far end of the supplementary air duct, solving the problem of pressure attenuation caused by friction in the airflow within the supplementary air duct. It allows a small amount of airflow that has not flowed out at the far end of the supplementary air duct to flow back to the pressure equalization chamber through the micro-groove to form a small circulation, avoiding stagnation of airflow and low pressure at the far end, and completely eliminating the defect of no airflow at the far end of the supplementary air duct. All the adjustment components adopt a smooth design.

[0007] In one possible implementation, the constant temperature mechanism further includes a filter assembly disposed inside the housing. The filter assembly is connected to a rigid air duct, allowing the airflow entering the make-up air duct from the main air duct to filter impurities, preventing blockages in the make-up air duct and extending its service life. The filter assembly includes a filter box detachably mounted on the housing and connected to an airflow diversion valve, and a filter cylinder rotatably disposed inside the filter box. The filter box has a filter cavity connected to the rigid air duct. The upper and lower ends of the filter cylinder extend out of the filter cavity and fit snugly inside the filter box. The filter cavity has symmetrically arranged partition plates, and the partition plates have through slots that match the filter cylinder, allowing the filter cylinder to filter the airflow. The filter cylinder has several spacers arranged in a circular array, and the spacers can fit snugly against the partition plates.

[0008] According to one aspect, the two partition plates separate the filter chamber into a cleaning chamber. The filter assembly further includes a cleaning roller brush rotatably disposed in the cleaning chamber to clean the inner wall of the filter cylinder, and a first cleaning scraper disposed against the outside of the cleaning roller brush to raise and lower the cleaning roller brush for cleaning. The inner wall of the first cleaning scraper is an arc-shaped surface that fits against the cleaning roller brush. The filter assembly further includes a rotating internal gear ring disposed on the upper inner side of the filter cylinder and controlling the rotation of the cleaning roller brush, and a first transmission gear coaxially connected to the cleaning roller brush and meshing with the rotating internal gear ring. The rotating internal gear ring and the first transmission gear cooperate to cause the cleaning roller brush to rotate as the filter cylinder rotates. The filter assembly also includes a drive motor disposed on the filter box and a... A rotating component is placed on the output shaft of the drive motor and connected to the top of the filter cylinder, the top of the filter cylinder being sealed; the filter assembly also includes a first screw drive structure vertically disposed in the cleaning chamber and a telescopic protective sleeve disposed outside the first screw drive structure, the first screw drive structure having a first connecting component extending out of the telescopic protective sleeve and connected to the first cleaning scraper, the top of the first screw drive structure extending into the filter box via a first rotating rod, the top of the first rotating rod having a first rotating gear meshing with a first transmission gear, the first rotating gear being able to control the first cleaning scraper to move up and down on the outside of the cleaning roller brush via the first screw drive structure, cleaning impurities on the outer wall of the cleaning roller brush.

[0009] In one possible implementation, the filter assembly further includes cleaning scrapers symmetrically arranged in the cleaning chamber for cleaning the outer wall of the filter cartridge. The cleaning scrapers are perpendicularly attached to the outer wall of the filter cartridge and are vertically arranged in the cleaning chamber. The side of the cleaning scraper closest to the filter cartridge has an isosceles triangular cross-section, while the side furthest from the filter cartridge has a rectangular cross-section. The filter assembly also includes a second cleaning scraper attached to the cleaning scraper for cleaning the scraper and a second screw drive structure disposed inside the cleaning scraper and controlling the movement of the second cleaning scraper. Both the lead screw drive structure and the second lead screw drive structure are reciprocating lead screw drive structures. The inner side of the second cleaning scraper is in contact with the outer side of the cleaning scraper. The second lead screw drive structure is provided with a moving block to control the movement of the second cleaning scraper. The top of the second lead screw drive structure is provided with a second rotating rod that extends out of the cleaning scraper. The upper outer side of the filter cylinder is provided with a rotating external gear ring. The top of the second rotating rod is provided with a second rotating gear that meshes with the rotating external gear ring. This allows the second cleaning scraper to clean the impurities adhering to the cleaning scraper by controlling the rotating external gear ring and the second rotating gear when the filter cylinder rotates.

[0010] In one possible implementation, the filter assembly further includes a movable groove formed on the cleaning scraper and fitting against the movable block, and a plurality of sealing blocks symmetrically movably disposed in the movable groove and sealing the movable groove. The cleaning scraper has a sealing groove that fits against the sealing block, and one end of the sealing block is disposed in the sealing groove. The filter assembly further includes drive blocks symmetrically disposed on the upper and lower sides of the movable block and drive racks symmetrically disposed on both sides of the drive blocks. One end of the sealing block has an insertion groove that matches the drive block. The filter assembly further includes a drive rack rotatably disposed on the cleaning scraper and fitting against the drive block. The sealing block has a drive gear meshing with a moving rack and a second transmission gear coaxially connected to the drive gear via a connecting rod. A moving rack meshing with the second transmission gear is fixed to the rear side of the sealing block. Several guide grooves that fit with the moving rack are provided on the cleaning scraper. A guide rod that fits with the sealing block and a return spring sleeved on the guide rod and connected to the sealing block are vertically provided in the sealing groove. The initial state of the return spring is set to a slightly compressed state. When the moving block is aligned with the sealing block, the guide rod and the return spring cooperate to reset the sealing block and make the two sealing blocks fit together to seal the moving groove.

[0011] In one possible implementation, the filter assembly further includes a scraper assembly disposed in the cleaning chamber for cleaning the inner wall of the filter cartridge and a limiting strip disposed on the rear side of the scraper assembly. The rear side of the scraper assembly is provided with a plurality of limiting rods that extend evenly into the limiting strip. The limiting strip is provided with a limiting spring that is coaxially connected to the limiting rods.

[0012] In one possible implementation, the constant temperature mechanism further includes a collection box disposed inside the housing and attached to the bottom of the filter box. The bottom of the filter box has symmetrically provided discharge grooves, and the top of the collection box has a feed chute aligned with the discharge grooves. The filter box is provided with an auxiliary component for sealing the discharge grooves. The auxiliary component facilitates the disassembly and cleaning of the collection box by the operator.

[0013] According to one aspect, the auxiliary component includes a first auxiliary plate and a second auxiliary plate movably disposed in the filter box and sealing two discharge grooves. The first auxiliary plate is disposed on the side of the filter box away from the main air duct, and the length of the second auxiliary plate is greater than that of the first auxiliary plate. The auxiliary component also includes guide moving strips symmetrically disposed on the lower end faces of the first and second auxiliary plates, respectively. The filter box has guide moving grooves that fit with the guide moving strips. The auxiliary component also includes a first rack and a first gear meshing with the first rack, disposed on the guide moving strip. The outer side of the guide moving strip has a first groove for mounting the first rack. The first gear and the first rack cooperate to control the movement of the first auxiliary plate or the second auxiliary plate through the guide moving strip.

[0014] According to one aspect, the auxiliary component further includes a second gear coaxially disposed below the first gear and a second rack meshing with the second gear. The upper end of the collection box is symmetrically and offsetly provided with a first mounting strip and a second mounting strip. The vertical cross-section of the first mounting strip and the second mounting strip is convex. The first mounting strip and the second mounting strip are each provided with a second groove for fixing the second rack. The bottom end of the filter box is respectively provided with a first mounting groove and a second mounting groove aligned with the first mounting strip and the second mounting strip. This allows the first mounting strip to control the first auxiliary plate to close or open the discharge groove through the second rack, the second gear, the first gear, and the first rack. This allows the second mounting strip to control the second auxiliary plate to close or open the discharge groove through the second rack, the second gear, the first gear, and the first rack.

[0015] The significant technical effects of the embodiments of the present invention are as follows: (1) The present invention provides a biochemical incubator with constant temperature function. The main air duct, air outlet box, make-up air duct, air volume diversion valve, rigid air guide hose and air curtain outlet are used in conjunction to make the sensor switch linked with the door. When the door is opened, the constant temperature air curtain is triggered immediately, which effectively isolates the influx of cold or hot air from the outside and reduces the leakage of constant temperature air in the chamber. After the door is closed, the make-up air duct quickly replenishes the slightly lost heat, shortens the temperature recovery time in the chamber and avoids the adverse effects of temperature fluctuation on the activity of experimental samples. The sound is improved, enhancing the accuracy of experimental data and eliminating the need for the refrigeration or heating system to operate at high load after the door is opened, thereby reducing energy loss. Through the combined use of pressure equalization pipes, pressure equalization orifice plates, arc-shaped guide ribs, parallel shaped guide grooves, and static pressure return micro-grooves, it is ensured that the airflow can reach the entire air outlet smoothly and evenly without affecting the normal circulation of the main air duct. This allows the makeup air duct to uniformly discharge air from all directions through the air curtain outlet, completely eliminating the problem of no airflow at the far end of the annular air duct and improving the performance of the biochemical incubator.

[0016] (2) The present invention provides a biochemical incubator for experiments with constant temperature function. The filter box, filter cylinder, partition plate and partition strip are used together to filter the gas entering the make-up air duct, so as to prevent impurities in the gas from clogging the make-up air duct or the air curtain outlet. Through the setting of cleaning roller brush, first cleaning scraper, rotating internal gear ring, first transmission gear, drive motor, first lead screw transmission structure, telescopic protective sleeve, first connecting piece, first rotating gear, scraper group, limit strip, limit rod and limit spring, impurities can be cleaned from the inner wall of the filter cylinder. The cleaning scraper can remove impurities from the outer wall of the filter cartridge, extending its service life. The second cleaning scraper, second lead screw drive structure, moving block, rotating external gear ring, and second rotating gear clean impurities adhering to the second cleaning scraper, improving its cleaning effect on the filter cartridge. The moving groove is effectively sealed by a sealing block, drive block, drive rack, drive gear, second transmission gear, moving rack, guide rod, and return spring, reducing interference from impurities on the second lead screw drive structure and improving the filter assembly's performance.

[0017] (3) The present invention provides a biochemical incubator for laboratory use with constant temperature function. The collection box can collect the impurities collected by the filter box and form a sealed space with the filter box. The first auxiliary plate and the second auxiliary plate can open or close the discharge groove in the filter box, which is convenient for the staff to disassemble or install the filter box. The guide moving strip, the first rack, the first gear, the second gear, the second rack, the first mounting strip and the second mounting strip make the collection box and the filter box work together. During the disassembly or installation of the collection box, the discharge groove is opened or closed. The staff does not need to manually open or close the discharge groove, which improves the auxiliary effect of the auxiliary components and improves the use effect of the biochemical incubator. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a biochemical incubator with constant temperature function in one embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the housing and the temperature control mechanism in this invention; Figure 3 This is a schematic diagram of the thermostatic mechanism in this invention; Figure 4 This is a schematic diagram of the make-up air duct and air volume diversion valve in this invention; Figure 5 This is a cross-sectional view of the make-up air duct and pressure equalization pipe in this invention. Figure 6 This is a cross-sectional view of the filter component in this invention; Figure 7 This is a schematic diagram of the structure of the filtering component and auxiliary component in this invention; Figure 8 This is a schematic diagram of the cleaning roller brush and rotating internal toothed ring in this invention; Figure 9 This is a schematic diagram of the cleaning roller brush and cleaning scraper in this invention; Figure 10 This is a schematic diagram of the second lead screw transmission structure and the second rotating gear in this invention; Figure 11 This is a schematic diagram of the structure of the moving block and the sealing block in this invention; Figure 12 This is a schematic diagram of the auxiliary component in this invention.

[0020] In the diagram: 1. Housing; 2. Door; 3. Main air duct; 4. Air outlet box; 5. Makeup air duct; 6. Airflow diversion valve; 7. Rigid air duct; 8. Air curtain outlet; 9. Pressure equalizing pipe; 10. Pressure equalizing orifice plate; 11. Arc-shaped guide rib; 12. Filter box; 13. Filter cartridge; 14. Divider plate; 15. Divider strip; 16. Cleaning roller brush; 17. First cleaning scraper; 18. Rotating internal gear ring; 19. First transmission gear; 20. Drive motor; 21. First lead screw transmission structure; 22. Telescopic protective sleeve; 23. First connecting piece; 24. First rotating gear; 25. Cleaning scraper; 26. Second cleaning scraper; 27. 28. Second lead screw transmission structure; 29. ​​Moving block; 30. Rotating external gear ring; 31. Second rotating gear; 32. Sealing block; 33. Drive block; 34. Drive rack; 35. Drive gear; 36. Second transmission gear; 37. Moving rack; 38. Guide rod; 39. Return spring; 40. Scraper assembly; 41. Limiting strip; 42. Limiting rod; 43. Limiting spring; 44. Collection box; 45. First auxiliary plate; 46. Second auxiliary plate; 47. Guide moving strip; 48. First rack; 49. Second gear; 50. Second rack; 51. First mounting strip; 52. Second mounting strip. Detailed Implementation

[0021] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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, they should not be construed as limitations on the embodiments of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components.

[0028] Example 1 Please see Figures 1-6 This illustration shows an embodiment of a biochemical incubator with a constant temperature function, comprising a chamber body 1 and a constant temperature mechanism disposed inside the chamber body 1. The chamber body 1 is provided with a sealable door 2, and a placement cavity is provided on the front side of the interior of the chamber body 1. The constant temperature mechanism includes a thermostat disposed inside the chamber body 1, a refrigeration system and a heating system connected to the thermostat, a main air duct 3 disposed inside the chamber body 1 and a circulating fan disposed inside the main air duct 3, and air outlet boxes 4 symmetrically disposed on the inner side of the chamber body 1, communicating with the placement cavity. The air outlet boxes 4 are connected to the main air duct 3. The air box 4 has several downward-sloping air outlets, and the lower side of the placement cavity has an air inlet connected to the main air duct 3. Both the refrigeration and heating systems are located inside the lower side of the main air duct 3. The refrigeration system includes a compressor, evaporator, condenser, and expansion valve. The heating system includes several evenly arranged stainless steel electric heating tubes, a heating relay connected to the stainless steel electric heating tubes, and a fuse. The temperature control mechanism also includes an adjustment component located on the door 2 and connected to the main air duct 3. The adjustment component includes a makeup air duct 5 located inside the door 2 and a component located inside the housing 1 and connected to the main air duct 3. The system includes a flow divider valve 6 and a rigid air duct 7 connecting the make-up air duct 5 to the flow divider valve 6. An air curtain outlet 8 is inclined on the make-up air duct 5. The flow divider valve 6 is electrically controlled. The housing 1 is equipped with a sensor switch that works with the door 2. The sensor switch is located at the hinge side of the housing 1 and the door 2, with a sensing distance of 5mm. It is triggered immediately when the door 2 is opened to a distance ≥5mm and reset immediately when closed. The sensor switch is connected in series with the temperature controller of the circulating fan and the electromagnetic switch of the flow divider valve 6. The sensing signal is directly transmitted to the temperature controller to realize the fan speed and airflow distribution. With the automatic switching of the flow valve 6, when the box door 2 is opened, the circulating fan immediately turns to medium speed, and the air volume diversion valve 6 automatically opens, allowing 30% of the air volume in the main air duct 3 to enter the makeup air duct 5. The remaining air volume maintains normal circulation within the box 1. The makeup air duct 5 and the air curtain outlet 8 work together to blow out a constant temperature airflow, forming a constant temperature air curtain between the box door 2 and the box 1, isolating hot and cold air from entering the box 1 and reducing the leakage of constant temperature air from the box 1. When the box door 2 is closed, the air volume diversion valve 6 closes, and the makeup air duct 5 maintains a low speed for three minutes to quickly replenish the slightly lost constant temperature air within the box 1.

[0029] Furthermore, when it is necessary to raise the temperature of the placement chamber inside the housing 1, the heating system is activated, the heating relay and stainless steel electric heating tube work to heat the chamber, and the thermostat and circulating fan guide the heated airflow into the placement chamber through the main air duct 3 until the temperature inside the placement chamber reaches the set value. When it is necessary to lower the temperature inside the placement chamber, the heating system is turned off and the cooling system is activated, so that the compressor, evaporator, condenser and expansion valve work to cool the chamber, and the thermostat, circulating fan and main air duct 3 work together to guide the cooled gas into the air outlet box 4 and into the placement chamber through the air outlet until the temperature inside the placement chamber reaches the set value.

[0030] Furthermore, when the box door 2 is opened, the circulating fan immediately switches to medium speed, causing the air volume diversion valve 6 to open automatically. This allows 30% of the air volume in the main air duct 3 to enter the make-up air duct 5, while the remaining air volume maintains normal circulation within the box 1. The make-up air duct 5 directs 30% of the air volume into the air curtain outlet 8, causing the air curtain outlet 8 to blow a constant-temperature airflow into the box 1, forming a constant-temperature air curtain between the box door 2 and the box 1. This prevents outside hot and cold air from entering the box 1 and reduces the leakage of constant-temperature air from the box 1. When the box door 2 is closed, the air volume diversion valve 6 slowly closes, allowing the make-up air duct 5 to operate at a low speed for three minutes to replenish the slight loss of constant-temperature air within the box 1.

[0031] As a specific example, such as Figure 3 - Figure 6 As shown, the make-up air duct 5 is designed with a U-shaped structure. The constant temperature mechanism also includes a double-layer insulation layer installed on the outside of the main air duct 3, the air outlet box 4, and the make-up air duct 5 to reduce energy loss. The adjustment component also includes a pressure equalization pipe 9 installed inside the door 2 and fixedly connected to the make-up air duct 5. The pressure equalization pipe 9 has a pressure equalization chamber inside that communicates with the make-up air duct 5. One end of the pressure equalization pipe 9 is connected to one end of the rigid air guide hose 7. The make-up air duct 5 has a pressure equalization perforated plate 10 inside. The pressure equalization perforated plate 10 includes several ventilation holes arranged in a triangular array. The pressure equalization perforated plate 10 extends along the cavity of the make-up air duct 5 and is located on the side of the make-up air duct 5 near the air curtain outlet 8. At the corner, there is an arc-shaped guide rib 11 for guiding the airflow smoothly. The side of the make-up air duct 5 near the air curtain outlet 8 is provided with several parallel shaped guide grooves. The air curtain outlet 8 is provided with a narrow slit outlet that works in conjunction with the parallel shaped guide grooves. The inner wall of the far end of the make-up air duct 5 is provided with a static pressure return micro-groove that is connected to the pressure equalization pipe 9. The static pressure return micro-groove serves as a pressure compensation unit at the far end of the make-up air duct 5, which solves the problem of pressure attenuation caused by friction in the make-up air duct 5. It allows a small amount of airflow that has not flowed out at the far end of the make-up air duct 5 to flow back to the pressure equalization chamber through the micro-groove to form a small circulation, avoiding stagnation of airflow at the far end and low pressure, and completely eliminating the defect of no airflow at the far end of the make-up air duct 5. All adjustment components adopt a smooth design.

[0032] Furthermore, the main air duct 3 delivers airflow to the make-up air duct 5 through the rigid air guide hose 7. The airflow diversion valve 6 precisely limits the airflow entering the make-up air duct 5. The pressure equalization pipe 9 converts the unstable dynamic pressure in the rigid air guide hose 7 into stable static pressure through the pressure equalization chamber, allowing the airflow to enter the make-up air duct 5 stably. The arc-shaped guide rib 11 cooperates to guide the airflow to flow smoothly. The static pressure return micro-groove balances the pressure at the far end of the loop, forming a small circulation, and enabling the pressure equalization orifice plate 10 to achieve a second precise pressure equalization, transforming the circumferential static pressure field of the loop into a uniform pressure equalization field throughout the entire area. The uniform airflow from the pressure equalization orifice plate 10 enters the parallel shaping guide groove, is combed into parallel fine streams, and then achieves flow restriction and directional airflow through the narrow slit air outlet. The curtain-like airflow blown out of the air outlet forms a complete annular constant temperature air curtain.

[0033] Example 2 Based on Example 1, referring to Figure 6 - Figure 11 This is the second embodiment of the present invention.

[0034] As a specific example, such as Figure 6 and Figure 7 As shown, the constant temperature mechanism also includes a filter assembly installed inside the housing 1. The filter assembly is connected to the rigid air duct 7, so that the airflow entering the make-up air duct 5 from the main air duct 3 is filtered for impurities, avoiding blockage in the make-up air duct 5 and extending the service life of the make-up air duct 5. The filter assembly includes a filter box 12 that is detachably installed on the housing 1 and connected to the airflow diversion valve 6, and a filter cylinder 13 that is rotatably installed inside the filter box 12. The filter box 12 has a filter cavity that is connected to the rigid air duct 7. The upper and lower ends of the filter cylinder 13 extend out of the filter cavity and fit into the filter box 12. The filter cavity is symmetrically provided with partition plates 14. The partition plates 14 are fitted with through slots that match the filter cylinder 13, so that the filter cylinder 13 can filter the airflow. The filter cylinder 13 is provided with several partition strips 15 in a circular array, and the partition strips 15 can fit into the partition plates 14.

[0035] Furthermore, when the airflow diversion valve 6 directs the airflow inside the main air duct 3 into the filter box 12, the filter cartridge 13 filters impurities from the airflow and directs the filtered airflow through the airflow diversion valve 6 into the rigid air duct 7, so that the rigid air duct 7 directs the airflow into the make-up air duct 5.

[0036] As a specific example, such as Figure 7 and Figure 8As shown, two partition plates 14 divide the filter chamber into a cleaning chamber. The filter assembly also includes a cleaning roller brush 16 rotatably disposed in the cleaning chamber to clean the inner wall of the filter cylinder 13, and a first cleaning scraper 17 fitted to the outside of the cleaning roller brush 16 to perform lifting and cleaning of the cleaning roller brush 16. The inner side wall of the first cleaning scraper 17 is an arc-shaped surface that fits against the cleaning roller brush 16. The filter assembly also includes a rotating internal gear ring 18 disposed on the upper inner side of the filter cylinder 13 to control the rotation of the cleaning roller brush 16, and a first transmission gear 19 coaxially connected to the cleaning roller brush 16 and meshing with the rotating internal gear ring 18. The rotating internal gear ring 18 and the first transmission gear 19 cooperate to make the cleaning roller brush 16 rotate with the rotation of the filter cylinder 13. The filter assembly also includes a drive motor 20 disposed on the filter box 12 and a first transmission gear 19 disposed on the filter box 12. The filter assembly includes a rotating component on the output shaft of the drive motor 20 and connected to the top of the filter cylinder 13. The top of the filter cylinder 13 is set to a sealed state. The filter assembly also includes a first screw drive structure 21 vertically arranged in the cleaning chamber and a telescopic protective sleeve 22 arranged outside the first screw drive structure 21. The first screw drive structure 21 is provided with a first connecting member 23 that extends out of the telescopic protective sleeve 22 and is connected to the first cleaning scraper 17. The top of the first screw drive structure 21 extends into the filter box 12 through the first rotating rod. The top of the first rotating rod is provided with a first rotating gear 24 that meshes with the first transmission gear 19. The first rotating gear 24 can control the first cleaning scraper 17 to move up and down on the outside of the cleaning roller brush 16 through the first screw drive structure 21 to clean the impurities on the outer wall of the cleaning roller brush 16.

[0037] Furthermore, when the filter cylinder 13 is activated at regular intervals, the drive motor 20 is started, causing the filter cylinder 13 to rotate, so that the filter surface of the filter cylinder 13 passes through the partition plate 14 and rotates into the cleaning chamber. The filter surface of the filter cylinder 13 is adjusted to make the filter cylinder 13 work continuously. When the filter cylinder 13 is working, it drives the rotating internal gear ring 18 to rotate, so that the rotating internal gear ring 18 drives the first transmission gear 19 to rotate, so that the first transmission gear 19 drives the cleaning roller brush 16 to rotate, so that the cleaning roller brush 16 cleans the inner wall of the filter cylinder 13. When the first transmission gear 19 rotates, it drives the first rotating gear 24 to rotate. The first rotating gear 24 drives the first lead screw transmission structure 21 to work through the first rotating rod. The first lead screw transmission structure 21 drives the first connecting member 23 to move and drives the telescopic protective sleeve 22 to extend and retract. The first connecting member 23 drives the first cleaning scraper 17 to move on the cleaning roller brush 16 to clean the cleaning roller brush 16.

[0038] As a specific example, such as Figure 7 - Figure 10As shown, the filter assembly also includes cleaning scrapers 25 symmetrically arranged in the cleaning chamber to clean the outer wall of the filter cylinder 13. The cleaning scrapers 25 are perpendicularly attached to the outer wall of the filter cylinder 13 and are vertically arranged in the cleaning chamber. The side of the cleaning scraper 25 closest to the filter cylinder 13 has an isosceles triangular cross-section, while the side of the cleaning scraper 25 furthest from the filter cylinder 13 has a rectangular cross-section. The filter assembly also includes a second cleaning scraper 26 attached to the cleaning scraper 25 for cleaning the cleaning scraper 25, and a second lead screw drive structure 27 disposed inside the cleaning scraper 25 and controlling the movement of the second cleaning scraper 26. The first lead screw drive structure 21 and... The second lead screw drive structure 27 is configured as a reciprocating lead screw drive structure. The inner side of the second cleaning scraper 26 is in contact with the outer side of the cleaning scraper 25. The second lead screw drive structure 27 is provided with a moving block 28 for controlling the movement of the second cleaning scraper 26. The top of the second lead screw drive structure 27 is provided with a second rotating rod extending out of the cleaning scraper 25. The upper outer side of the filter cylinder 13 is provided with a rotating external gear ring 29. The top of the second rotating rod is provided with a second rotating gear 30 that meshes with the rotating external gear ring 29. When the filter cylinder 13 rotates, the rotating external gear ring 29 and the second rotating gear 30 control the second cleaning scraper 26 to clean the impurities adhering to the cleaning scraper 25.

[0039] Furthermore, when the filter cylinder 13 rotates, the cleaning scraper 25 cleans the impurities on the outer wall of the filter cylinder 13, and the filter cylinder 13 drives the rotating external gear ring 29 to rotate, which in turn drives the second rotating gear 30 to rotate. The second rotating gear 30 drives the second lead screw transmission structure 27 to work through the second rotating rod, which in turn drives the moving block 28 to move. The moving block 28 drives the second cleaning scraper 26 to move, so that the second cleaning scraper 26 cleans the impurities adhering to the cleaning scraper 25, preventing impurities from accumulating and adhering to the cleaning scraper 25.

[0040] As a specific example, such as Figure 10 - Figure 11As shown, the filter assembly also includes a movable groove formed on the cleaning scraper 25 and fitting against the movable block 28, and several sealing blocks 31 symmetrically and movably disposed in the movable groove and sealing the movable groove. The cleaning scraper 25 has a sealing groove that fits against the sealing block 31, and one end of the sealing block 31 is disposed in the sealing groove. The filter assembly also includes a drive block 32 symmetrically disposed on the upper and lower sides of the movable block 28 and a drive rack 33 symmetrically disposed on both sides of the drive block 32. One end of the sealing block 31 has an insertion groove that matches the drive block 32. The filter assembly also includes a drive gear 34 rotatably disposed on the cleaning scraper 25 and meshing with the drive rack 33. A second transmission gear 35, coaxially connected to the drive gear 34, is provided via a connecting rod. A movable rack 36, meshing with the second transmission gear 35, is fixed on the rear side of the sealing block 31. Several guide grooves that fit with the movable rack 36 are provided on the cleaning scraper 25. A guide rod 37 that fits with the sealing block 31 and a return spring 38 that is sleeved on the guide rod 37 and connected to the sealing block 31 are vertically provided in the sealing groove. The initial state of the return spring 38 is set to a slightly compressed state. When the moving block 28 is aligned with the sealing block 31, the guide rod 37 and the return spring 38 cooperate to reset the sealing block 31, so that the two sealing blocks 31 fit together and seal the moving groove.

[0041] Furthermore, when the second lead screw transmission structure 27 drives the moving block 28 to move downward, the moving block 28 drives the driving block 32 to move. The lower driving block 32 drives the driving rack 33 to move. The driving rack 33 meshes with the driving gear 34, causing the driving gear 34 to drive the second transmission gear 35 to rotate. The second transmission gear 35 drives the moving rack 36 to move into the guide groove. The moving rack 36 drives the sealing block 31 to move into the sealing groove, so that the moving block 28 passes through the two sealing blocks 31. When the upper driving rack 33 meshes with the driving gear 34, the driving gear 34 drives the moving rack 36 to move into the guide groove through the second transmission gear 35. This causes the return spring 38 to elastically compress the sealing block 31. When the upper driving block 32 leaves, the return spring 38 causes the sealing block 31 to reset and causes the sealing block 31 to move in a guided manner on the guide rod 37.

[0042] As a specific example, such as Figure 8 - Figure 9 As shown, the filter assembly also includes a scraper assembly 39 disposed in the cleaning chamber to clean the inner wall of the filter cylinder 13 and a limiting strip 40 disposed on the rear side of the scraper assembly 39. Several limiting rods 41 are vertically disposed on the rear side of the scraper assembly 39 and extend evenly into the limiting strip 40. A limiting spring 42 is disposed in the limiting strip 40 and is coaxially connected to the limiting rods 41.

[0043] Furthermore, when the filter cylinder 13 rotates, the scraper assembly 39 cleans the inner wall of the filter cylinder 13, and the limiting spring 42 elastically compresses the limiting rod 41.

[0044] Example 3 Based on Example 2, referring to Figure 6 - Figure 7 and Figure 12 This is the third embodiment of the present invention.

[0045] As a specific example, such as Figure 6 - Figure 7 As shown, the constant temperature mechanism also includes a collection box 43 located inside the housing 1 and attached to the bottom of the filter box 12. The bottom of the filter box 12 is symmetrically provided with a discharge groove, and the top of the collection box 43 is provided with a feed chute aligned with the discharge groove. The filter box 12 is provided with an auxiliary component for sealing the discharge groove. The auxiliary component facilitates the disassembly and cleaning of the collection box 43 by the operator. The outer side of the collection box 43 is provided with a handle extending out of the housing 1.

[0046] Furthermore, when the collection box 43 has collected enough impurities, it is moved outward so that the auxiliary component closes the discharge groove and the filter box 12 forms a sealed space for filtration and cleaning. After cleaning the impurities inside the collection box 43, the collection box 43 is installed on the housing 1, and the auxiliary component opens the discharge groove, forming a sealed space between the collection box 43 and the filter box 12. The collection box 43 collects the cleaned impurities through the discharge groove and the feed chute.

[0047] As a specific example, such as Figure 7 and Figure 12 As shown, the auxiliary component includes a first auxiliary plate 44 and a second auxiliary plate 45 movably disposed in the filter box 12 and sealing the two discharge grooves. The first auxiliary plate 44 is disposed on the side of the filter box 12 away from the main air duct 3. The length of the second auxiliary plate 45 is greater than that of the first auxiliary plate 44. The auxiliary component also includes guide moving strips 46 symmetrically disposed on the lower end faces of the first auxiliary plate 44 and the second auxiliary plate 45, respectively. The filter box 12 has guide moving grooves that fit with the guide moving strips 46. The auxiliary component also includes a first rack 47 disposed on the guide moving strip 46 and a first gear 48 meshing with the first rack 47. The outer side of the guide moving strip 46 has a first groove for mounting the first rack 47. The first gear 48 and the first rack 47 cooperate to control the movement of the first auxiliary plate 44 or the second auxiliary plate 45 through the guide moving strip 46.

[0048] Furthermore, when the first gear 48 rotates, it causes the first rack 47 to move, which in turn causes the guide moving bar 46 to move. The guide moving bar 46 then causes the first auxiliary plate 44 and the second auxiliary plate 45 to move, thereby opening or closing the feeding groove.

[0049] As a specific example, such as Figure 7 and Figure 12 As shown, the auxiliary components also include a second gear 49 coaxially disposed below the first gear 48 and a second rack 50 meshing with the second gear 49. The upper end of the collection box 43 is symmetrically offset with a first mounting strip 51 and a second mounting strip 52. The vertical cross-section of the first mounting strip 51 and the second mounting strip 52 are both convex. The first mounting strip 51 and the second mounting strip 52 are both provided with a second groove for fixing the second rack 50. The bottom end of the filter box 12 is provided with a first mounting groove and a second mounting groove aligned with the first mounting strip 51 and the second mounting strip 52, respectively. This allows the first mounting strip 51 to control the first auxiliary plate 44 to close or open the discharge groove through the second rack 50, the second gear 49, the first gear 48 and the first rack 47. This allows the second mounting strip 52 to control the second auxiliary plate 45 to close or open the discharge groove through the second rack 50, the second gear 49, the first gear 48 and the first rack 47.

[0050] Furthermore, the collection box 43 is installed onto the filter box 12, causing the first mounting strip 51 to move in the first mounting groove and the second mounting strip 52 to move in the second mounting groove. This causes the first mounting strip 51 and the second mounting strip 52 to drive the second rack 50 to move, so that the second rack 50 meshes with the second gear 49, causing the second gear 49 to rotate. The second gear 49 then drives the first gear 48 to rotate, causing the first gear 48 to control the movement of the first auxiliary plate 44 and the second auxiliary plate 45 through the cooperation of the first rack 47 and the guide moving strip 46. This opens the discharge groove, allowing the collection box 43 to connect with the filter box 12. Conversely, when the collection box 43 is removed from the filter box 12, the first auxiliary plate 44 and the second auxiliary plate 45 are controlled to close the discharge groove.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention 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 the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. A biochemical incubator for laboratory use with constant temperature function, comprising a chamber body (1) and a door (2) connected to the chamber body (1), characterized in that, include: The main air duct (3) is located inside the box (1) and blows air at an angle through the air outlet box (4). An air volume diversion valve (6) is provided on one side of the main air duct (3). The equalizing pipe (9) is located inside the box door (2) and is connected to the air volume diversion valve (6) through a rigid air guide hose (7); The air supply duct (5) is fixedly connected to the pressure equalization pipe (9). The pressure equalization pipe (9) is provided with a pressure equalization cavity that communicates with the air supply duct (5). The inner wall of the far end of the air supply duct (5) is provided with a static pressure return micro-groove that communicates with the pressure equalization pipe (9). The air curtain outlet (8) is installed at an angle on the make-up air duct (5) and can blow the airflow in the make-up air duct (5) toward the housing (1). The pressure equalizing orifice plate (10) is set inside the air supply duct (5) and extends along the cavity of the air supply duct (5). The pressure equalizing orifice plate (10) includes a number of ventilation holes arranged in a triangular array. The air supply duct (5) has a number of parallel shaped guide grooves on the side near the air curtain outlet (8).

2. The experimental biochemical incubator with constant temperature function according to claim 1, characterized in that, The air supply duct (5) is configured as a square structure; One end of the equalizing pipe (9) is connected to one end of the rigid air guide hose (7); The pressure equalizing perforated plate (10) includes a plurality of ventilation holes arranged in a triangular array; The internal corner of the supplementary air duct (5) is provided with an arc-shaped guide rib (11) for guiding the airflow to flow smoothly. The air curtain outlet (8) is provided with a narrow slit outlet that works in conjunction with the parallel shaped guide groove; The airflow diversion valve (6) is electrically controlled; The box body (1) is equipped with an induction switch that works in conjunction with the box door (2); The induction switch is located at the hinge side of the junction between the box body (1) and the box door (2), with a sensing distance of 5mm. It is triggered immediately when the opening distance of the box door (2) is ≥5mm, and reset immediately when it is closed. The box (1) is equipped with a temperature controller and a circulating fan inside; The induction switch is connected in series with the thermostat of the circulating fan and the electromagnetic switch of the air volume diversion valve (6). The induction signal is directly transmitted to the thermostat to realize the automatic switching of the fan speed and the air volume diversion valve (6). When the door (2) is opened, the circulating fan immediately turns on medium speed, and the air volume diversion valve (6) automatically opens, so that 30% of the air volume in the main air duct (3) enters the make-up air duct (5), and the remaining air volume maintains normal circulation in the box (1). The make-up air duct (5) and the air curtain outlet (8) work together to blow out constant temperature airflow, forming a constant temperature air curtain between the door (2) and the box (1), which isolates the outside cold and hot air from entering the box (1) and reduces the leakage of constant temperature air in the box (1). When the door (2) is closed, the air volume diversion valve (6) closes, and the make-up air duct (5) runs at a low speed for three minutes to quickly replenish the slightly lost constant temperature air in the box (1).

3. The experimental biochemical incubator with constant temperature function according to claim 2, characterized in that, The housing (1) is provided with filter boxes (12) that are connected to the airflow diversion valve (6) and the rigid air duct (7) respectively. The filter box (12) is rotatably equipped with a filter cylinder (13); The filter box (12) is symmetrically provided with partition plates (14) that divide the filter cylinder (13). The filter cylinder (13) is provided with several spacers (15) arranged in a circular array.

4. A laboratory biochemical incubator with constant temperature function according to claim 3, characterized in that, The partition plate (14) divides the internal space of the filter box (12) into a filter chamber and cleaning chambers located on both sides of the filter chamber; The cleaning chamber is symmetrically rotated with a cleaning roller (16) for cleaning the inner wall of the filter cylinder (13). The cleaning roller brush (16) is provided with a first cleaning scraper (17) on the side away from the filter cylinder (13) to perform lifting and cleaning of the cleaning roller brush (16). The filter cylinder (13) is provided with a rotating internal toothed ring (18) on the upper inner side to control the rotation of the cleaning roller brush (16). The upper end of the cleaning roller brush (16) is coaxially provided with a first transmission gear (19) that meshes with the rotating internal gear ring (18). The upper end of the filter box (12) is provided with a drive motor (20) for controlling the rotation of the filter cylinder (13). The cleaning chamber is provided with a first screw drive structure (21) for controlling the lifting and lowering of the first cleaning scraper (17). The first lead screw transmission structure (21) is fitted with a telescopic protective sleeve (22) on its outer side. The top end of the first lead screw transmission structure (21) is provided with a first rotating gear (24) that meshes with the first transmission gear (19).

5. A laboratory biochemical incubator with constant temperature function according to claim 4, characterized in that, The cleaning chamber is symmetrically provided with cleaning scrapers (25) for cleaning the outer wall of the filter cylinder (13); The cleaning scraper (25) has an isosceles triangular cross-section on the side near the filter cartridge (13); The cleaning scraper (25) has a rectangular cross-section on the side away from the filter cartridge (13); A second cleaning scraper (26) is attached to the cleaning scraper (25); The cleaning scraper (25) is provided with a second screw drive structure (27) for controlling the movement of the second cleaning scraper (26). The top end of the second lead screw drive structure (27) is provided with a second rotating rod that extends out of the cleaning scraper (25); The top end of the second rotating rod is provided with a second rotating gear (30); The upper outer side of the filter cylinder (13) is provided with a rotating external gear ring (29) that meshes with several second rotating gears (30), so that when the filter cylinder (13) rotates, the rotating external gear ring (29) and the second rotating gears (30) cooperate to control the second cleaning scraper (26) to clean the impurities adhering to the cleaning scraper (25).

6. A laboratory biochemical incubator with constant temperature function according to claim 5, characterized in that, The second lead screw transmission structure (27) is provided with a moving block (28) for controlling the movement of the second cleaning scraper (26); The cleaning scraper (25) has a movable groove that fits into the movable block (28); The movable groove is symmetrically provided with several sealing blocks (31); The moving block (28) is provided with driving blocks (32) on both the upper and lower sides; The drive block (32) is provided with drive racks (33) symmetrically on both sides; One end of the sealing block (31) is provided with a plug-in groove that matches the driving block (32); The cleaning scraper (25) has several drive gears (34) inside that mesh with the drive rack (33). A second transmission gear (35) is coaxially provided on one side of the drive gear (34). The rear side of the sealing block (31) is fixed with a movable rack (36) that meshes with the second transmission gear (35). The cleaning scraper (25) is provided with a sealing groove for the sealing block (31) to move, so that when the moving block (28) moves downward, the sealing block (31) is moved away by the cooperation of the drive rack (33) and the drive gear (34) through the second transmission gear (35) and the moving rack (36).

7. A laboratory biochemical incubator with constant temperature function according to claim 6, characterized in that, The sealing groove is provided with a guide rod (37) that moves in contact with the sealing block (31). A return spring (38) connected to the sealing block (31) is sleeved on the guide rod (37). The initial state of the reset spring (38) is set to a slightly compressed state. After the moving block (28) and the sealing block (31) are in contact, the guide rod (37) and the reset spring (38) work together to reset the sealing block (31) and seal the moving groove between the two sealing blocks (31).

8. A laboratory biochemical incubator with constant temperature function according to claim 4, characterized in that, The cleaning chamber is equipped with a scraper assembly (39) for cleaning the inner wall of the filter cylinder (13); The scraper assembly (39) is provided with a limiting strip (40) aligned with its rear side. The scraper assembly (39) is provided with several limiting rods (41) that extend evenly into the limiting strip (40) vertically. The limiting strip (40) is provided with a limiting spring (42) that is coaxially connected to the limiting rod (41).

9. A laboratory biochemical incubator with constant temperature function according to claim 4, characterized in that, The inside of the box (1) is provided with a collection box (43) that fits into the bottom of the filter box (12). The bottom end of the filter box (12) is symmetrically provided with feeding grooves; The top of the collection box (43) is provided with a feeding groove that is aligned with the feeding groove; The filter box (12) is provided with a first auxiliary plate (44) and a second auxiliary plate (45) for sealing two material discharge grooves. The first auxiliary plate (44) is located on the side of the filter box (12) away from the main air duct (3); The length of the second auxiliary plate (45) is greater than the length of the first auxiliary plate (44); The lower end faces of the first auxiliary plate (44) and the second auxiliary plate (45) are symmetrically provided with guide moving strips (46); The guide moving bar (46) is provided with a first rack (47); The filter box (12) is internally equipped with a first gear (48) that meshes with the first rack (47); The first gear (48) and the first rack (47) work together to control the movement of the first auxiliary plate (44) or the second auxiliary plate (45) via the guide moving bar (46).

10. A laboratory biochemical incubator with constant temperature function according to claim 9, characterized in that, A second gear (49) is coaxially provided on the lower side of the first gear (48). The upper end of the collection box (43) is symmetrically offset with a first mounting strip (51) and a second mounting strip (52); The upper ends of the first mounting strip (51) and the second mounting strip (52) are both provided with a second rack (50) that meshes with the second gear (49). The vertical cross-sections of the first mounting strip (51) and the second mounting strip (52) are both convex-shaped structures; The bottom end of the filter box (12) is provided with a first mounting groove and a second mounting groove that are aligned with the first mounting strip (51) and the second mounting strip (52); When the first mounting strip (51) and the second mounting strip (52) are inserted into the first mounting groove and the second mounting groove respectively, the first mounting strip (51) controls the first auxiliary plate (44) to close or open the material discharge groove through the second rack (50), the second gear (49), the first gear (48) and the first rack (47), and the second mounting strip (52) controls the second auxiliary plate (45) to close or open the material discharge groove through the second rack (50), the second gear (49), the first gear (48) and the first rack (47).

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