阅读说明：本技术 一种便于更换过滤器且风速稳定的生物安全柜 (Biosafety cabinet convenient to change filter and wind speed is stable ) 是由 刘发柱 徐桂杰 孙晓雪 慕吉升 刘欣 郑永权 于吉帅 邱长义 于 2020-11-30 设计创作，主要内容包括：本发明提供一种便于更换过滤器且风速稳定的生物安全柜。包括生物安全柜主体和分体设置于生物安全柜主体内的排气过滤器和下降过滤器,其中排气过滤器通过可拆卸固定在生物安全柜主体上的排气过滤器导风板限位在生物安全柜主体顶端预设位置,下降过滤器通过下降过滤器导风板限位在生物安全柜操作口上方预设位置,所述下降过滤器导风板在第一状态下能够固定压持在下降过滤器上,所述下降过滤器导风板在第二状态下能够停靠在适宜更换下降过滤器的预设位置。本发明拆卸部件较少,节省操作时间,同时避免因为过多部件拆卸、组装产生的安装错误隐患,降低更换人员的能力要求。同时,避免仅需更换一处过滤器时必须拆卸两部分结构而造成的人力浪费。(The invention provides a biosafety cabinet which is convenient for replacing a filter and has stable wind speed. The biological safety cabinet comprises a biological safety cabinet main body, and an exhaust filter and a descending filter which are arranged in the biological safety cabinet main body in a split mode, wherein the exhaust filter is limited at a preset position at the top end of the biological safety cabinet main body through an exhaust filter air deflector detachably fixed on the biological safety cabinet main body, the descending filter is limited at a preset position above an operation opening of the biological safety cabinet through a descending filter air deflector, the descending filter air deflector can be fixedly pressed on the descending filter in a first state, and the descending filter air deflector can stop at a preset position suitable for replacing the descending filter in a second state. The invention has fewer disassembled parts, saves the operation time, avoids the hidden trouble of installation error caused by too many parts disassembly and assembly, and reduces the capability requirement of replacing personnel. Meanwhile, the manpower waste caused by the fact that two parts of structures need to be disassembled when only one filter needs to be replaced is avoided.)

1. The biological safety cabinet is characterized by comprising a biological safety cabinet main body, an exhaust filter and a descending filter, wherein the exhaust filter and the descending filter are arranged in the biological safety cabinet main body in a split mode, the exhaust filter is limited at a preset position at the top end of the biological safety cabinet main body through an exhaust filter air deflector detachably fixed on the biological safety cabinet main body, the descending filter is limited at a preset position above an operation opening of the biological safety cabinet through a descending filter air deflector, the descending filter air deflector can be fixedly pressed and held on the descending filter in a first state, and the descending filter air deflector can stop at a preset position suitable for replacing the descending filter in a second state.

2. The biosafety cabinet facilitating filter replacement and stabilizing wind speed according to claim 1, wherein the descending filter air deflector is fixed to the biosafety cabinet body by a descending filter air deflector fixing shaft, and the descending filter air deflector is rotatable about the descending filter air deflector fixing shaft.

3. The biosafety cabinet convenient for filter replacement and stable in wind speed according to claim 1, wherein a descending filter hook is arranged inside the biosafety cabinet, one end of the hook is connected with the biosafety cabinet main body and can rotate and swing, an ear plate matched with the hook is arranged on the side of the descending filter air deflector, and the other end of the hook can be manually inserted into the descending filter hook ear plate in the second state.

4. The biosafety cabinet convenient for filter replacement and stable wind speed according to claim 1, wherein the descending filter fixing plate is connected with the biosafety cabinet body through a screw, the descending filter fixing plate is provided with a bending structure, the bending structure is provided with a screw hole, and the descending filter air deflector is tightly pressed with the descending filter through the bending structure.

5. The biosafety cabinet facilitating filter replacement and stabilizing wind speed according to claim 1, wherein the interior of the biosafety cabinet body is sealed by a detachable sealing plate, and the exterior of the sealing plate is provided with a detachable outer cover plate.

6. The biosafety cabinet convenient for filter replacement and stable wind speed according to claim 1, wherein the exhaust area where the exhaust filter is located is provided with an exhaust fan, and the descending area where the descending filter is located is provided with a descending fan.

7. The biosafety cabinet convenient for filter replacement and stable wind speed as claimed in claim 1 or 6, wherein the exhaust pressure sensor for measuring wind pressure in the exhaust area is connected with the exhaust pressure interface through a hose, and the descent pressure sensor for measuring wind pressure in the descent area is connected with the descent pressure interface through a hose.

8. The biosafety cabinet convenient for filter replacement and stable wind speed according to claim 7, further comprising a temperature sensor for measuring the temperature inside the biosafety cabinet, wherein the temperature sensor is fixed inside the biosafety cabinet, the temperature sensor, the exhaust pressure sensor, the descent pressure sensor, the exhaust fan and the descent fan are all connected with a controller, and the controller controls the wind speed of the exhaust fan and the descent fan based on data monitored by the temperature sensor, the exhaust pressure sensor and the descent pressure sensor.

Technical Field

The invention relates to the technical field of biological safety cabinets, in particular to a biological safety cabinet which is convenient for replacing a filter and has stable wind speed.

Background

The biosafety cabinet is designed for protecting the operator, the laboratory environment and the experimental materials from being exposed to infectious aerosols and splashes which may be generated in the operation process when operating infectious experimental materials such as primary cultures, strains of bacteria and viruses and diagnostic specimens. The working principle is that negative pressure airflow formed in the suction cabinet through the front window operation port protects the safety of operators; descending airflow filtered by a high efficiency filter (HEPA) is used for protecting the tested objects in the safety cabinet; the air flows through a high efficiency filter (HEPA) and then is discharged out of the safety cabinet to protect the environment.

The filter that biological safety cabinet used need be changed after reaching the saturated condition, because structural problem, part producer product need dismantle several even a plurality of parts or part just can change, some complicated processes need 2 people to coordinate just can go on, both influenced efficiency, also there is the hidden danger of installation error, it is not independent with exhaust filter still to have the decline filter simultaneously, the problem of unable independent change, the technical problem that now urgently needs to solve is under the prerequisite of changing the structure and guaranteeing the seal, change the in-process and should carry out the part as little as possible and dismantle, reduce operating personnel quantity simultaneously.

The wind speed is a basic parameter of the biological safety cabinet, in the standard YY 0569-2011 II-level biological safety cabinet, the difference between the nominal value and the measured value is required to be within +/-0.025 m/s, because the wind speed is determined by the rotating speed of the fan and the pressure loss of the filter, and the pressure loss of the filter is gradually increased along with the use time, the rotating speed of the fan is required to be correspondingly adjusted to keep the stable wind speed,

disclosure of Invention

According to the technical problem that the aforesaid provided, and provide one kind only need dismantle double-deck apron and filter fixed plate can 1 people change, two kinds of filters change the structure simultaneously and independent respectively, design that each other does not influence. The technical means adopted by the invention are as follows:

the utility model provides a biosafety cabinet convenient to change filter and wind speed is stable, includes biosafety cabinet main part and components of a whole that can function independently set up exhaust filter and decline filter in the biosafety cabinet main part, and wherein exhaust filter is spacing at biosafety cabinet main part top preset position through the exhaust filter aviation baffle that can dismantle the fixing in biosafety cabinet main part, and decline filter is spacing in biosafety cabinet operation mouth top preset position through decline filter aviation baffle, decline filter aviation baffle can fix the pressure and hold on decline the filter under the first state, decline filter aviation baffle can stop at the preset position that suits to change the decline filter under the second state.

Furthermore, the descending filter air deflector and the biological safety cabinet main body are fixed together through a descending filter air deflector fixing shaft, and the descending filter air deflector can rotate by taking the descending filter air deflector fixing shaft as an axis.

Furthermore, a descending filter hook is arranged in the biological safety cabinet, one end of the hook is connected with the biological safety cabinet main body and can rotate and swing, an ear plate matched with the hook is arranged on the side of the descending filter air deflector, and the other end of the hook can be manually inserted into the ear plate of the descending filter hook in the second state.

Furthermore, the descending filter fixing plate is connected with the biological safety cabinet main body through screws, the descending filter fixing plate is provided with a bending structure, the bending structure is provided with screw holes, and the descending filter air deflector and the descending filter are tightly pressed through the bending structure.

Further, the interior of the biological safety cabinet main body is sealed by a detachable sealing plate, and a detachable outer cover plate is arranged outside the sealing plate.

Further, an exhaust fan is arranged in an exhaust area where the exhaust filter is located, and a descending fan is arranged in a descending area where the descending filter is located.

Further, an exhaust pressure sensor for measuring the wind pressure of the exhaust area is connected with the exhaust pressure interface through a hose, and a descent pressure sensor for measuring the wind pressure of the descent area is connected with the descent pressure interface through a hose.

Further, the biological safety cabinet air speed control device further comprises a temperature sensor used for measuring the internal temperature of the biological safety cabinet, the temperature sensor is fixed inside the biological safety cabinet, the temperature sensor, the exhaust pressure sensor, the descending pressure sensor, the exhaust fan and the descending fan are all connected with the controller, and the controller controls the air speeds of the exhaust fan and the descending fan based on data monitored by the temperature sensor, the exhaust pressure sensor and the descending pressure sensor.

The invention has the following advantages:

1. when the filter needs to be replaced, the number of the detachable parts is small, the operation time is saved, the hidden trouble of installation errors caused by the detachment and the assembly of too many parts is avoided, and the capability requirement of replacement personnel is reduced.

2. Can 1 people carry out the operation and change, reduce the human cost.

3. Avoid only having to dismantle 2 partial structures when changing a filter, cause meaningless manpower extravagant.

4. The descending fan and the exhaust fan are independently controlled, and the rotating speed of the fan is adjusted at the moment when the air speed changes through the pressure value, so that the stability of the air speed is kept.

5. In the same space, the pressure is more uniform and stable than the wind speed, and the requirement on the installation position of the sensor is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an exploded view of a part of the mechanism of the present invention.

Fig. 2 is a schematic structural view of the present invention in a replacement state.

Fig. 3 is an inside elevational view of the present invention.

Fig. 4 is an interior side view of the present invention.

Fig. 5 is a partially enlarged schematic view of the internal side view of the present invention.

FIG. 6 is a control diagram of the present invention.

In the figure: 1. an outer cover plate; 2. a sealing plate; 3. a biosafety cabinet body; 31. a fixed shaft of the filter air deflector descends; 32. an exhaust filter fixing bolt; 33. a temperature sensor; 4. a descending filter hook; 5. a drop filter; 6. lowering the filter holding plate; 7. a pressure sensor; 71. an exhaust pressure sensor; 72. a falling pressure sensor; 8. a descending filter air deflector; 81. a reduced pressure interface; 82. a descending fan; 9. an exhaust filter air deflector; 91. an exhaust pressure interface; 92. an exhaust fan; 93. a bolt guide hole; 10. an exhaust gas filter; 11. and a controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, the present embodiment discloses a biosafety cabinet with stable wind speed and easy filter replacement, which comprises a biosafety cabinet main body 3, an exhaust filter 10 and a descending filter 5 separately arranged in the biosafety cabinet main body, wherein the exhaust filter 10 is limited at the preset position at the top end of the biological safety cabinet main body through an exhaust filter air deflector 9 which is detachably fixed on the biological safety cabinet main body, and is specifically guided through a bolt guide hole 93 arranged on the exhaust filter air deflector, fixed by an exhaust filter fixed bolt 32, the descending filter 5 is limited at a preset position above an operation opening of the biological safety cabinet by a descending filter air deflector 8, the falling filter air deflector 8 can be fixed and pressed against the falling filter 5 in a first state, the drop filter air deflector 8 can be parked at a preset position suitable for replacing the drop filter in the second state.

The descending filter air deflector 8 and the biosafety cabinet main body are fixed together by a descending filter air deflector fixing shaft 31, and the descending filter air deflector 8 can rotate by taking the descending filter air deflector fixing shaft 31 as an axis.

The biological safety cabinet is internally provided with a descending filter hook 4, one end of the hook is connected with the biological safety cabinet main body and can rotate and swing, the side of the descending filter air deflector is provided with an ear plate matched with the hook, and the other end of the hook can be manually inserted into the descending filter hook ear plate in the second state. In an optional embodiment, the hook is arranged on one side of the biosafety cabinet with the smaller width, and the hooks are arranged on two sides of the biosafety cabinet with the larger width.

In this embodiment, the fixing and pressing mainly comprises a descending filter fixing plate 6, the descending filter fixing plate 6 is connected with the biosafety cabinet main body 3 through screws, the descending filter fixing plate 6 is provided with a bending structure, the bending structure is provided with screw holes, and a descending filter air deflector and a descending filter are pressed tightly through the bending structure.

The biological safety cabinet main body 3 is internally sealed by a detachable sealing plate 2, and a detachable outer cover plate 1 is arranged outside the sealing plate.

The specific disassembly process of this embodiment is as follows: the outer cover plate 1 and the sealing plate 2 are sequentially detached by using a screwdriver, if the descending filter 5 needs to be replaced, one end of the descending filter air deflector 8 is hung up with the biological safety cabinet main body 3 by using the descending filter hook 4, and then the descending filter 5 is taken out; if the exhaust filter 10 needs to be replaced, the exhaust filter fixing bolt 32 is rotated counterclockwise, then the exhaust filter air deflector 9 is removed in the opposite direction, and then the exhaust filter 10 is removed, and the installation process is reverse to the disassembly process.

An exhaust fan 92 is arranged in an exhaust area where the exhaust filter is located, and a descending fan 82 is arranged in a descending area where the descending filter is located.

Wind speed and wind pressure calculation formula: wp is 0.5 ro v2

And (Wp): wind pressure [ kN/m ]²]ro: air Density [ kg/m³]v: wind speed [ m/s ]]

Air density is affected by temperature changes. Therefore, under the condition of no change of other conditions, the wind pressure is corrected according to the following relationship when the temperature changes, so as to obtain the wind pressure value under the standard condition: p' [ (273+ t)/293]

P': measured pressure

For this purpose, a pressure sensor 7 is arranged inside the biosafety cabinet, specifically comprising an exhaust pressure sensor 71 and a descent pressure sensor 72, the exhaust pressure sensor for measuring the air pressure in the exhaust area is connected with the exhaust pressure interface 91 through a hose, and the descent pressure sensor for measuring the air pressure in the descent area is connected with the descent pressure interface 81 through a hose. The biological safety cabinet air speed control device is characterized by further comprising a temperature sensor 33 used for measuring the internal temperature of the biological safety cabinet, the temperature sensor is fixed inside the biological safety cabinet, the temperature sensor, the exhaust pressure sensor, the descending pressure sensor, the exhaust fan and the descending fan are all connected with the controller, and the controller 11 controls the air speeds of the exhaust fan and the descending fan through data monitored by the temperature sensor, the exhaust pressure sensor and the descending pressure sensor based on an operational relation formula of the fan rotating speed and the fan pressure. Specifically, the control system logic is that pressure sensor transmits the pressure data of place space to the controller, converts into fan control voltage after controller logical operation and through temperature sensor data correction, realizes the different rotational speeds of fan through different voltages, and fan rotational speed change leads to pressure variation simultaneously, produces the circulation once more, so the repeated order is carried out, keeps the wind speed stable.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.