Multipurpose energy-saving biological safety cabinet

Abstract

The utility model relates to the technical field of safety cabinets, and particularly discloses a multipurpose energy-saving biological safety cabinet which comprises a cabinet body, a working cabin, an exhaust purification module, a descending circulation purification module and a control module, a front window operation opening is formed in the front end of the cabinet body, liftable front window glass is installed on the front window operation opening, and a front window glass opening contact switch and a front window glass bottom contact switch which are used for sensing the front window glass are arranged on the edge, corresponding to the front window operation opening, of the cabinet body. The working cabin is arranged in the cabinet body; the discharge purification module and the descending circulation purification module are both mounted in the cabinet body; the control module is configured to control the exhaust purification module to be closed or opened when the front window glass triggers the front window glass bottom contact switch or the front window glass opening contact switch; and the control module is configured to control the power of the descending circulation purification module to be reduced to a set value when the discharging purification module is closed. According to the safety cabinet, internal circulation can be guaranteed when the front window glass is closed, so that the application range of the safety cabinet is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of safety cabinets, in particular to a multi-purpose energy-saving biological safety cabinet. Background Art

[0002] The biological safety cabinet is a box-type air purification negative pressure safety device that can prevent the aerosol dispersion of certain dangerous or unknown biological particles during experimental operations. All biological contaminated parts in the biological safety cabinet are in a negative pressure state or surrounded by negative pressure channels and negative pressure ventilation systems. It is widely used in scientific research, teaching, clinical testing and production in the fields of microbiology, biomedicine, genetic engineering, biological products, etc. It is the most basic safety protection equipment in the first-level protection barrier of laboratory biosafety; the working principle of the biological safety cabinet is mainly to suck the air in the cabinet outward to keep the cabinet in a negative pressure state, and at the same time protect the staff through the downward airflow; the downward airflow is a mixture of part of the inflow airflow and part of the vertical airflow, which is filtered by a high-efficiency air filter and sent to the work area to avoid contamination of the processed samples.

[0003] The airflow of traditional biological safety cabinets is discharged and descended by a fan. Specifically, the incoming airflow and the descending airflow flow into the static pressure box through the air duct. The fan discharges part of the airflow through the high-efficiency filter, and feeds part of the airflow back to the working area through the high-efficiency filter. When the fan is turned on, the front window glass needs to be opened, and the fan needs to inhale part of the airflow from the front window operation port to maintain pressure balance. When microorganisms are cultured for a long time, the working area must have a clean environment and be isolated from the outside world. The front window glass needs to be closed and the fan needs to be turned on; however, the front window of the traditional biological safety cabinet is a 6mm thick tempered glass, and the fan needs to inhale airflow from the front window. If the front window is closed and the fan is not turned off, the suction of the fan will cause the negative pressure in the cabinet to increase, thereby causing the glass to break. When the fan is turned off, the internal airflow cannot be circulated internally, and the cleanliness of the internal space cannot be maintained, which limits the use of the biological safety cabinet. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to solve the problem that the internal circulation cannot be realized when the fan of the existing biological safety cabinet is turned off, resulting in limited use.

[0005] In order to solve the above technical problems, the utility model provides a multi-purpose energy-saving biological safety cabinet, comprising:

[0006] A cabinet, wherein a front window operation port is provided at the front end of the cabinet, a liftable front window glass is installed on the front window operation port, a front window glass opening contact switch and a front window glass bottom contact switch for sensing the front window glass are provided at an edge of the cabinet corresponding to the front window operation port, and the front window glass opening contact switch is placed above the front window glass bottom contact switch;

[0007] A working cabin, the working cabin is arranged inside the cabinet, and the working cabin is configured to form a closed cabin when the front window glass is lowered and closed;

[0008] An external exhaust purification module, which is installed inside the cabinet and is used to filter the gas inside the cabinet and then discharge it to the outside;

[0009] A descending circulation purification module, which is disposed inside the cabinet, is in a normally open state and is used to filter the gas inside the cabinet and then transport it to the working chamber; and

[0010] A control module, wherein the control module is configured to control the external exhaust purification module to be closed or opened when the front window glass triggers the front window glass bottom contact switch or the front window glass open contact switch; the control module is also configured to control the power of the descending circulation purification module to be reduced to a set value when the external exhaust purification module is closed.

[0011] Further preferably, a purification cavity is formed between the top of the working chamber and the inner top of the cabinet, and the external exhaust purification module and the descending circulation purification module are both arranged in the purification cavity.

[0012] Further preferably, a first guide channel is formed between the working chamber and the bottom of the cabinet, and a second guide channel is formed between the working chamber and the back of the cabinet, and the second guide channel is used to connect the purification cavity and the first guide channel.

[0013] Further preferably, an air inlet hole is provided on a side of the first air guide channel close to the front window operating port, and the air inlet hole connects the working compartment and the first air guide channel.

[0014] Further preferably, the external exhaust purification module comprises an external exhaust static pressure box and an external exhaust fan, the external exhaust static pressure box is arranged in the purification cavity, and the external exhaust static pressure box is provided with an external exhaust air outlet connected to the outside on a side away from the external exhaust fan.

[0015] Further preferably, the external exhaust purification module also includes an external exhaust filter, and the external exhaust filter is arranged between the external exhaust fan and the external exhaust air outlet.

[0016] Further preferably, the descending circulation purification module includes a descending static pressure box and a descending fan connected to each other, the descending static pressure box is provided with a descending air outlet connected to the working compartment, and the interior of the descending static pressure box is provided with a descending filter covering the descending air outlet.

[0017] Further preferably, the external exhaust fan and the downdraft fan are both controlled by the control module, and the control module is configured to control the external exhaust fan to be turned off when the front window glass triggers the front window glass bottom contact switch, and at the same time control the power of the downdraft fan to be reduced to a set value.

[0018] Compared with the prior art, the multi-purpose energy-saving biological safety cabinet provided by the utility model has the following beneficial effects:

[0019] The utility model independently completes the outward discharge and downward flow of airflow by an outward discharge purification module and a downward circulation purification module respectively, and controls the opening and closing of the outward discharge purification module and the power of the downward circulation purification module according to the front window glass opening contact switch and the front window glass bottoming contact switch through the control module. When the front window glass is closed, the working cabin forms a closed cabin and the front window glass bottoming contact switch is triggered at the same time. The control module controls the closing of the outward discharge purification module according to the signal of the front window glass bottoming contact switch, and controls the power of the downward circulation purification module to be reduced to a set value to reduce energy consumption. The downward circulation purification module can extract and filter the gas in the cabinet and the working cabin and then transport it to the working cabin, thereby realizing internal circulation, and can also meet the environmental cleanliness level in the working area when microorganisms are cultured for a long time under isolation from the outside world. On the contrary, when the front window glass is opened to trigger the front window glass opening contact switch, the control module controls the opening of the outward discharge purification module according to the signal of the front window glass opening contact switch, and restores the power of the downward circulation purification module, so that the cabinet maintains a negative pressure state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a multi-purpose energy-saving biological safety cabinet described in this embodiment.

[0021] Figure 2 It is a schematic diagram of the interior of a multi-purpose energy-saving biological safety cabinet described in this embodiment.

[0022] Figure 3 It is a front view of a multi-purpose energy-saving biological safety cabinet described in this embodiment (the front cover is omitted).

[0023] Figure 4 This embodiment Figure 3 Cross-sectional view of section AA (arrows in the figure indicate the direction of airflow).

[0024] Figure 5 It is a top view of a multi-purpose energy-saving biological safety cabinet described in this embodiment.

[0025] Figure 6 This embodiment Figure 5 Cross-sectional view of section BB.

[0026] In the figure:

[0027] 100, cabinet; 110, front window operation port; 120, front window glass; 130, air inlet; 140, first air guide channel; 150, purification cavity; 160, second air guide channel; 170, front window glass opening contact switch; 180, front window glass bottom contact switch;

[0028] 200. Working cabin;

[0029] 300, external exhaust purification module; 310, external exhaust static pressure box; 320, external exhaust outlet; 330, external exhaust fan; 340, external exhaust filter;

[0030] 400, descending circulation purification module; 410, descending static pressure box; 420, descending fan; 430, descending filter. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] like Figure 1-Figure 6 As shown, the present embodiment provides a multi-purpose energy-saving biosafety cabinet, comprising a cabinet body 100 and a working chamber 200, wherein a front window operation port 110 is provided at the front end of the cabinet body 100, and a liftable front window glass 120 is installed on the front window operation port 110, and a front window glass opening contact switch 170 and a front window glass bottom contact switch 180 for sensing the front window glass 120 are provided at the edge of the cabinet body 100 corresponding to the front window operation port 110, and the front window glass opening contact switch 170 is arranged above the front window glass bottom contact switch 180, when the front window glass 120 is lowered to a closed state, the front window glass 120 can trigger the front window glass bottom contact switch 180, and when the front window glass 120 is opened, the front window glass opening contact switch 170 can be triggered, and the working chamber 200 is arranged inside the cabinet body 100, and the working chamber 200 is configured to form a closed chamber when the front window glass 120 is lowered and closed.

[0038] In some embodiments, the multi-purpose energy-saving biosafety cabinet also includes an external exhaust purification module 300, a descending circulation purification module 400 and a control module, wherein the external exhaust purification module 300 is installed inside the cabinet 100, and the external exhaust purification module 300 is used to filter the gas inside the cabinet 100 and discharge it to the outside; the descending circulation purification module 400 is arranged inside the cabinet 100, the descending circulation purification module 400 is in a normally open state and the descending circulation purification module 400 is used to filter the gas inside the cabinet 100 and transport it to the working chamber 200; the control module is configured to control the external exhaust purification module 300 to be closed or opened when the front window glass 120 triggers the front window glass bottom contact switch 180 or the front window glass open contact switch 170; the control module is also configured to control the power of the descending circulation purification module 400 to be reduced to a set value when the external exhaust purification module 300 is closed. In this way, the air discharge and descent are completed independently by the external purification module 300 and the downward circulation purification module 400 respectively, and the control module controls the opening and closing of the external purification module 300 and the power of the downward circulation purification module 400 according to the front window glass opening contact switch 170 and the front window glass bottom contact switch 180, so as to realize internal circulation while reducing energy consumption.

[0039] In the above embodiment, when the front window glass 120 is closed, the working chamber 200 forms a closed chamber and the front window glass bottom contact switch 180 is triggered at the same time. The control module controls the external exhaust purification module 300 to be closed according to the signal of the front window glass bottom contact switch 180, and controls the power of the descending circulation purification module 400 to be reduced to a set value to reduce energy consumption. The descending circulation purification module 400 can extract the gas in the cabinet 100 and the working chamber 200 and filter it before transporting it to the working chamber 200, thereby realizing internal circulation, and can also meet the environmental cleanliness level in the working area when microorganisms are cultured for a long time in isolation from the outside world; conversely, when the front window glass 120 is opened and the front window glass opening contact switch 170 is triggered, the control module controls the external exhaust purification module 300 to be opened according to the signal of the front window glass opening contact switch 170, and restores the power of the descending circulation purification module 400 to keep the cabinet in a negative pressure state.

[0040] In some embodiments, a purification cavity 150 is formed between the top of the working cabin 200 and the inner top of the cabinet 100, and the external exhaust purification module 300 and the downward circulation purification module 400 are both arranged in the purification cavity 150; specifically, a first guide channel 140 is formed between the working cabin 200 and the bottom of the cabinet 100, and a second guide channel 160 is formed between the working cabin 200 and the back of the cabinet 100, and the second guide channel 160 is used to connect the purification cavity 150 and the first guide channel 140. The first guide channel 140 is provided with an air inlet 130 on one side close to the front window operating port 110, and the air inlet 130 connects the working cabin 200 and the first guide channel 140; in this way, by setting the first guide channel 140 and the second guide channel 160 to connect the working cabin 200 with the purification cavity 150, the flow of air can be realized, and it is also beneficial to the subsequent internal circulation of air.

[0041] In addition, when the front window glass 120 is opened, part of the incoming air flow and part of the downward air flow are mixed and guided to the purification cavity 150 through the air inlet hole 130, the first guide channel 140 and the second guide channel 160 under the action of negative pressure, so that part of the gas is discharged to the outside after being filtered by the external exhaust purification module 300, and part of the gas is filtered by the downward circulation purification module 400 and then fed back to the working cabin 200.

[0042] In some embodiments, the external exhaust purification module 300 includes an external exhaust static pressure box 310 and an external exhaust fan 330. The external exhaust static pressure box 310 is arranged in the purification cavity 150. The side of the external exhaust static pressure box 310 away from the external exhaust fan 330 is provided with an external exhaust outlet 320 connected to the outside. The external exhaust purification module 300 also includes an external exhaust filter 340, which is arranged between the external exhaust fan 330 and the external exhaust outlet 320. When in use, the external exhaust fan 330 is started to draw the mixed air in the purification cavity 150 into the external exhaust static pressure box 310, and then the mixed air is discharged through the external exhaust outlet 320 after being filtered by the external exhaust filter 340. The gas filtered by the external exhaust filter 340 can be directly discharged to the laboratory or discharged to the atmosphere through the exhaust duct.

[0043] In some embodiments, the down-circulation purification module 400 includes a down-circulation static pressure box 410 and a down-circulation fan 420 connected to each other, the down-circulation static pressure box 410 is provided with a down-circulation air outlet connected to the working chamber 200, and the interior of the down-circulation static pressure box 410 is provided with a down-circulation filter 430 covering the down-circulation air outlet. When in use, the down-circulation fan 420 draws the mixed air in the purification cavity 150 into the down-circulation static pressure box 410, and after passing through the down-circulation filter 430, enters the working chamber 200 to form a vertical down-circulation airflow, replenishes the air in the working area, and protects the staff.

[0044] In the above embodiment, both the external exhaust fan 330 and the downdraft fan 420 are controlled by the control module, and the control module is configured to control the external exhaust fan 330 to be turned off when the front window glass 120 triggers the front window glass bottom contact switch 180, and at the same time control the power of the downdraft fan 420 to be reduced to a set value. In this way, two fans are used, the external exhaust fan 330 controls the external exhaust air volume, and the downdraft fan 420 controls the downdraft air volume, and the external exhaust static pressure box 310 and the downdraft static pressure box 410 are separated separately, and the air volume is sucked in by two different fans respectively. When the front window glass 120 is opened to the working height (this is convenient for testing experiments in the working cabin), the external exhaust fan 330 and the downdraft fan 420 work normally, and each sucks air into its own static pressure box, and the external exhaust and downdraft of the gas are completed without interfering with each other.

[0045] When microorganisms are to be cultured for a long time and are not easy to move, it is necessary to ensure a clean environment in the working cabin 200 and isolate it from the outside. To this end, the front window glass 120 needs to be lowered so that the working cabin 200 forms a closed cavity. When the front window glass 120 drops to the bottom and hits the front window glass bottom contact switch 180, the control module controls the external exhaust fan 330 to be turned off, and the external exhaust fan 330 stops sucking air. At the same time, the power of the downwind fan 420 is automatically reduced to the set value, such as reducing the efficiency of the downwind fan 420 to 1 / 5 of the original, thereby achieving internal air circulation while reducing operating energy consumption. The downwind fan 420 inhales the wind in the working cabin 200, and then intercepts the particles through the downwind filter 430 in the downwind static pressure box 410, and blows out clean air to the working cabin 200, and the cycle repeats. At this time, the air volume in the working cabin 200 does not need to be too large, as long as the internal space is kept clean and isolated from the outside.

[0046] When the microorganisms need to be cultured for a certain period of time and normal testing is required, the front window glass 120 needs to be opened. When the front window glass 120 rises, the control module will start the normal mode, increase the power of the downdraft fan 420, and start the external exhaust fan 330; when the front window glass 120 rises to a safe height, the operator can perform product testing in the working cabin 200.

[0047] In summary, the utility model embodiment provides a multi-purpose energy-saving biological safety cabinet, in which the airflow is discharged and descended by the external purification module 300 and the descending circulation purification module 400 respectively, and the control module controls the opening and closing of the external purification module 300 and the power of the descending circulation purification module 400 according to the front window glass opening contact switch 170 and the front window glass bottom contact switch 180. When the front window glass 120 is closed, the working chamber 200 forms a closed chamber, and the front window glass bottom contact switch 180 is triggered at the same time. The control module controls the external purification module 300 according to the signal of the front window glass bottom contact switch 180. 0 is closed, and at the same time, the power of the descending circulation purification module 400 is controlled to be reduced to the set value to reduce energy consumption. The descending circulation purification module 400 can extract and filter the gas in the cabinet 100 and the working chamber 200 and then transport it to the working chamber 200, thereby realizing internal circulation, and can also meet the environmental cleanliness level in the working area when microorganisms are cultured for a long time under isolation from the outside world; on the contrary, when the front window glass 120 is opened to trigger the front window glass opening contact switch 170, the control module controls the external exhaust purification module 300 to open according to the signal of the front window glass opening contact switch 170, and at the same time restores the power of the descending circulation purification module 400, so that the cabinet maintains a negative pressure state. The multi-purpose energy-saving biological safety cabinet provided by this embodiment has a wider range of uses after internal circulation, which is of great help to biological research work and can better protect products; the three biological performances of the safety cabinet are improved by one step.

[0048] The above is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the utility model, and these improvements and substitutions should also be regarded as the protection scope of the utility model. The above shows and describes the basic principles, main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-purpose energy-saving biological safety cabinet, characterized in that: include: A cabinet, wherein a front window operation port is provided at the front end of the cabinet, a liftable front window glass is installed on the front window operation port, a front window glass opening contact switch and a front window glass bottom contact switch for sensing the front window glass are provided at an edge of the cabinet corresponding to the front window operation port, and the front window glass opening contact switch is placed above the front window glass bottom contact switch; A working cabin, the working cabin is arranged inside the cabinet, and the working cabin is configured to form a closed cabin when the front window glass is lowered and closed; An external exhaust purification module, which is installed inside the cabinet and is used to filter the gas inside the cabinet and then discharge it to the outside; A descending circulation purification module, which is arranged inside the cabinet, is in a normally open state and is used to filter the gas inside the cabinet and then transport it to the working chamber; as well as A control module, wherein the control module is configured to control the external exhaust purification module to be closed or opened when the front window glass triggers the front window glass bottom contact switch or the front window glass open contact switch; the control module is also configured to control the power of the descending circulation purification module to be reduced to a set value when the external exhaust purification module is closed.

2. A multi-purpose energy-saving biological safety cabinet according to claim 1, characterized in that: A purification cavity is formed between the top of the working chamber and the inner top of the cabinet, and the external exhaust purification module and the descending circulation purification module are both arranged in the purification cavity.

3. A multi-purpose energy-saving biological safety cabinet according to claim 2, characterized in that: A first flow guide channel is formed between the working chamber and the bottom of the cabinet, and a second flow guide channel is formed between the working chamber and the back of the cabinet. The second flow guide channel is used to connect the purification cavity and the first flow guide channel.

4. A multi-purpose energy-saving biological safety cabinet according to claim 3, characterized in that: An air inlet is provided on one side of the first air guiding channel close to the front window operating port, and the air inlet is connected to the working compartment and the first air guiding channel.

5. A multi-purpose energy-saving biological safety cabinet according to claim 2, characterized in that: The external exhaust purification module comprises an external exhaust static pressure box and an external exhaust fan. The external exhaust static pressure box is arranged in the purification cavity. The side of the external exhaust static pressure box away from the external exhaust fan is provided with an external exhaust air outlet connected with the outside.

6. A multi-purpose energy-saving biological safety cabinet according to claim 5, characterized in that: The external exhaust purification module also includes an external exhaust filter, and the external exhaust filter is arranged between the external exhaust fan and the external exhaust air outlet.

7. A multi-purpose energy-saving biological safety cabinet according to claim 6, characterized in that: The descending circulation purification module includes a descending static pressure box and a descending fan connected to each other. The descending static pressure box is provided with a descending air outlet connected to the working chamber. The interior of the descending static pressure box is provided with a descending filter covering the descending air outlet.

8. A multi-purpose energy-saving biological safety cabinet according to claim 7, characterized in that: The external exhaust fan and the downdraft fan are both controlled by the control module, and the control module is configured to control the external exhaust fan to be turned off when the front window glass triggers the front window glass bottom contact switch, and simultaneously control the power of the downdraft fan to be reduced to a set value.

Images