CN111112271A - Adjustable speed-increasing and flow-stabilizing type physical and chemical safety cabinet - Google Patents
Adjustable speed-increasing and flow-stabilizing type physical and chemical safety cabinet Download PDFInfo
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- CN111112271A CN111112271A CN201911175094.5A CN201911175094A CN111112271A CN 111112271 A CN111112271 A CN 111112271A CN 201911175094 A CN201911175094 A CN 201911175094A CN 111112271 A CN111112271 A CN 111112271A
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- 239000000126 substance Substances 0.000 title claims description 12
- 239000003517 fume Substances 0.000 claims abstract description 84
- 230000001502 supplementing effect Effects 0.000 claims abstract description 70
- 238000009423 ventilation Methods 0.000 claims abstract description 58
- 239000007789 gas Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 168
- 239000013589 supplement Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
- B08B15/023—Fume cabinets or cupboards, e.g. for laboratories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Use In Laboratory Experiments (AREA)
Abstract
The invention provides an adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet, belonging to novel ventilation equipment, which comprises an air supplementing system, a flow regulating system and a flow regulating system, wherein the air supplementing system is arranged at the bottom end and the rear end of a ventilation cabinet and is used for supplementing air to the interior of the ventilation cabinet; the exhaust system is arranged at the top of the fume hood and used for exhausting gas in the fume hood; the water collecting and draining system is arranged at the bottom of the fume hood and is used for supplying water to the fume hood and collecting liquid in the fume hood; and the control system is arranged on the side edge of the upper part of the fume hood and is used for controlling the air supplementing system to perform air supplementing operation or controlling the exhaust operation of the exhaust system so as to enable the air supplementing flow and the exhaust flow in the fume hood to reach a balanced state. The ventilation cabinet disclosed by the invention is convenient to install, has a water collecting and draining function, is convenient for test utensils in the ventilation cabinet to clean and clear accumulated liquid in time, can prevent harmful gas and particles in a working cavity from overflowing, reduces the working noise of ventilation equipment, ensures the safety and comfort of the working environment of experimental personnel, and can effectively reduce the energy consumption of an air conditioner.
Description
Technical Field
The invention relates to the technical field of ventilation, in particular to an adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet.
Background
Ventilation equipment generally refers to equipment for discharging waste gas, harmful gas, particles and other substances in a certain working space to the outside after a series of harmless treatments, and the equipment is widely applied in the fields of industrial production, medical treatment, biological and chemical research and development and the like at present.
The traditional ventilation equipment is usually provided with a cabinet body, the interior of the cabinet body is a working space, air required by the interior of the cabinet body is sent into a large amount of indoor ambient air from an opening at the front end of the cabinet body (generally a gap reserved between a working door and the cabinet body) to the working space during working, and an air outlet is connected into a building exhaust pipeline driven by a high-power fan to be processed. On the one hand, the indoor ambient air supplied to the working space in such a ventilating device is basically clean and comfortable air treated by an air conditioner, and the air conditioner consumes a large amount of energy. On the other hand, the indoor self-wind-collecting type ventilation equipment is difficult to control the flow velocity of indoor air entering the working space of the equipment, so that the working space and indoor air are diffused and mixed due to various turbulent flows and turbulences, harmful substances are overflowed, a necessary safety detection and protection device is lacked, and the health safety of indoor workers is seriously threatened. In addition, traditional ventilation equipment structural design is unreasonable, and mesa and steelframe combination mode are glue bonding, and the mesa is yielding, and the lower cabinet body is directly placed in not horizontally ground, causes whole table top or the unbalanced state of equipment. The anticorrosion grade of the base steel and the anticorrosion property of the protective material can not meet the laboratory requirements, and the surface paint is excessively depended on.
Some neotype energy-conserving ventilation equipment appear in the existing market, adopt the tonifying wind structure mostly, through setting up a tonifying wind mouth from cabinet body top or below promptly, then obtain fresh air input fume chamber's workspace through tonifying wind pipe-line system from outdoor, the air conditioner energy consumption of building has been reduced really to a certain extent to this kind of structure. However, the simple air supplement device cannot ensure a relatively stable air flowing state in the working space of the ventilation equipment, the problem of outflow of harmful substances caused by turbulent flow and turbulence still exists, the noise of the air supplement channel is high, the comfort of the indoor environment where the ventilation equipment is located is reduced, and the hidden danger of harming the body health of indoor workers still exists. In addition, when the air supply type ventilation equipment in the current market is used by a plurality of indoor sets in parallel, the flow of an air supply system and an air exhaust system cannot be individually controlled and adjusted according to the actual working condition of a single set of equipment, an accurate control module is not provided, the air supply and the air exhaust control are not linked, once the air exhaust system fails, the air exhaust stops working, the air supply is carried out, the power consumption of the air supply system and the air exhaust system is increased, the energy-saving effect is not achieved, even the risk of air flow leakage in a working space is caused, and the exhaust cabinet becomes a dangerous cabinet; at present, the ventilation cabinets on the market do not have a drainage system, and vessels containing harmful substances are difficult to clean in time in the ventilation cabinets.
Disclosure of Invention
Aiming at the problems, the invention provides an adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet, which mainly solves the problem that the ventilation equipment in the prior art cannot clean vessels and collect and clean accumulated liquid in the ventilation cabinet in time.
The invention provides an adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet, which comprises:
the air supplementing system is arranged at the bottom end and the rear end of the fume hood and is used for supplementing air to the interior of the fume hood;
the exhaust system is arranged at the top of the fume hood and used for exhausting gas in the fume hood;
the water collecting and draining system is arranged at the bottom of the fume hood and is used for supplying water to the fume hood and collecting liquid in the fume hood;
and the control system is arranged on the side edge of the upper part of the fume hood and is used for controlling the air supplementing system to perform air supplementing operation or controlling the exhaust operation of the exhaust system so as to enable the air supplementing flow and the exhaust flow in the fume hood to reach a balanced state.
Further, fume chamber internally mounted water supply pipe more than the twice to dispose independent water valve, set up the water conservancy diversion notch at the fume chamber bottom plate of water valve below corresponding position, lay rather than the grid board that matches the installation on the water conservancy diversion notch, the water conservancy diversion notch passes through drainage pipe and is connected with the drainage tank of installing in fume chamber surface bottom, and the liquid that the drainage tank was collected collects is to main drainage pipe in, disposes drainage valve on the main drainage pipe, and main drainage pipe is with liquid emission to treating the emission department.
The air supplementing system further comprises an air supplementing flow stabilizing device, an air supplementing speed increasing device and an air supplementing pipeline, wherein the air supplementing pipeline is sequentially connected with the first manual valve, the first automatic valve, the air supplementing speed increasing device and the air supplementing flow stabilizing device; outdoor air is accelerated by the air supplementing and accelerating device and stably conveys fresh air to each direction in the ventilation cabinet by the air supplementing and stabilizing device; the ventilation cabinet also comprises a gas guide device which is arranged inside the ventilation cabinet, guides air entering from the air supplementing system and the whole airflow in the ventilation cabinet to circulate in a stable state, and timely discharges waste gas and particles through an air outlet of the air exhaust system; the exhaust system comprises an exhaust pipeline, a second manual valve, a second automatic valve and a gas collecting hood which are sequentially communicated, and the gas collecting hood collects gas to be exhausted inside the ventilation cabinet.
Furthermore, the air supplementing and speed increasing device is tubular, one end of the air supplementing and speed increasing device is provided with an air inlet cavity, the volume of the air inlet cavity gradually decreases and then gradually increases to an air outlet cavity at the other end, an air outlet of the air outlet cavity is a long strip-shaped gap, and the air inlet cavity and the air outlet cavity are in arc transition; the air outlet cavity of the air supplementing and accelerating device is connected with an air supplementing and flow stabilizing device; the air supplementing and flow stabilizing device is an internal hollow part, the hollow part is provided with a notch connected with an air outlet of the air supplementing and speed increasing device, and the two hollow parts are opposite and are provided with a plurality of ventilation grooves on the side surfaces adjacent to the notch.
Further, the gas guiding device comprises a guiding plate fixed in the ventilation cabinet; a plurality of through holes are uniformly distributed on the guide plate; the air supplied by the air supply system enters the exhaust system through the gap between the side wall of the fume hood and the guide plate and the through holes on the guide plate.
Further, the guide plate includes a top guide plate and a back guide plate, one end of the top guide plate is fixedly connected with the top of the fume hood, the other end of the top guide plate is fixedly connected with the back guide plate, the back guide plate is in surface contact with the fume hood, and a gap is reserved between the back guide plate and the side wall of the fume hood.
The pressure detection device is arranged at an air supply port of the air supply system and an air exhaust port of the air exhaust system and is used for controlling the balance between the air pressure in the fume hood and the indoor pressure; the pressure detection device compares the detected gas pressure value with a gas pressure value preset in the control system, and the obtained comparison result is fed back to the control system to control the opening and closing of the first automatic valve and the second automatic valve.
Furthermore, lifting door guide rail mechanisms are arranged on two sides of the ventilation cabinet, glass doors are arranged on the lifting door guide rail mechanisms, and the opening and closing of the glass doors are controlled manually or by a control system; the fume chamber is fixed on a support, and the support is built by a steel frame and a cross beam which are connected through tenons and screws.
Furthermore, the fume hood also comprises an auxiliary exhaust system which is used for connecting an additional device of the fume hood into the exhaust system; an auxiliary exhaust pipe of the auxiliary exhaust system is connected with an exhaust pipeline of the exhaust system, and the auxiliary exhaust pipe is connected with an auxiliary exhaust pipe joint.
And the safety mutual inspection alarm device is arranged at an air supplementing opening of the air supplementing system and an air outlet of the air exhausting system, and sends out an alarm signal when equipment fails.
The invention has the beneficial effects that:
1. the bottom of the safety cabinet is provided with a drainage system which provides water source for the fume hood, is convenient for cleaning utensils in the fume hood, is provided with a drainage guide notch and collects and discharges waste water to a designated position;
2. the bottom and the rear part of the fume hood are provided with the air supplementing accelerating device and the air supplementing current stabilizing device, and the air of the air supplementing pipeline flows into the air supplementing current stabilizing device after being accelerated, so that the phenomenon of turbulent flow or turbulent flow of air flow entering the fume hood is reduced, the relatively stable air flowing state in the working space of the fume hood is ensured, the probability of harmful substance leakage is reduced, the noise of an air supplementing channel is reduced, and the comfort of the indoor environment where the fume hood is located is improved;
3. the inside of the fume hood is provided with a gas guide plate, and the guide plate is uniformly provided with a plurality of through holes, so that air entering from an air supply port of an air supply system and the whole airflow of a working cavity in the fume hood are effectively guided to perform stable circulation, and harmful gas and particles are timely discharged through an air outlet;
4. a manual valve and an automatic regulating valve are arranged at an air supplementing opening of the air supplementing system and an air exhaust opening of the air exhaust system, a gas pressure value detected by a pressure detection device is compared with a gas pressure value preset in a control system, and the gas pressure value is automatically fed back to the control system to control the automatic regulating valve to be opened and closed, so that the energy-saving performance of the fume hood is improved, and the energy-saving fume hood is a safe fume hood; meanwhile, the manual valve can adjust the gas flow rate by hands to perform adaptive fine adjustment.
5. A pressure detection device and a safety mutual detection alarm device are arranged at an air supply port of the air supply system and an air exhaust port of the air exhaust system, and the balance between the air pressure in the working cavity and the indoor pressure is controlled by the control system, so that harmful gases and particles are prevented from overflowing out of the working cavity of the ventilation cabinet; the safety mutual inspection alarm device sends out an alarm signal when equipment fails, so that the problems of harmful substances diffusion and leakage to the indoor environment caused by equipment failure due to various uncertain factors are effectively prevented;
6. this ventilation cabinet still installs nimble supplementary exhaust pipe and connects, and additional device with on the ventilation equipment that can be convenient inserts exhaust system to guarantee that various harmful, volatile material deposit, collect the ventilation of the cabinet body smooth and easy, establish comfortable, safe operational environment.
Drawings
Fig. 1 is a first schematic structural diagram of a safety cabinet according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a safety cabinet according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the safety cabinet from intake to exhaust according to one embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air supplement system of a safety cabinet according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wind-supplementing and speed-increasing device of a safety cabinet according to an embodiment of the invention;
fig. 6 is a schematic structural view of a wind and current supplementing and stabilizing device of a safety cabinet according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an exhaust system of the safety cabinet according to an embodiment of the present invention;
wherein: 1. an exhaust system; 10. an exhaust duct; 2. an auxiliary exhaust system; 20. an auxiliary exhaust pipe joint; 21. an auxiliary exhaust duct; 3. a wind supplementing system; 30. a wind-supplementing and flow-stabilizing device; 31. a wind-supplementing and speed-increasing device; 32. an air supply pipeline; 33. a gas-collecting hood; 4. a control system; 5. a baffle; 50. a top baffle; 51. a back baffle; 60. a first automatic valve; 61. a first manual valve; 62. a second automatic valve; 63. a second manual valve; 7. a fume hood; 70. a glass door; 71. a support; 8. a water collecting and draining system; 80. a water supply pipeline; 81. a flow guide notch; 82. a grid plate; 83. a drain tank; 84. and a main drainage pipeline.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 7, an adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet comprises:
as shown in fig. 1, a water collection and drainage system 8 is disposed at the bottom of the fume hood 7, and provides water for the fume hood 7 and collects liquid inside the fume hood 7; more than two water supply pipelines 80 are arranged in the ventilation cabinet 7, and are provided with independent water valves, and the water supply pipelines are arranged in the ventilation cabinet, so that some vessels containing harmful substances can be cleaned conveniently in the ventilation cabinet, and the operation is carried out in the ventilation cabinet environment, and the safety of operators is ensured; a flow guide notch 81 is formed in a corresponding position of a bottom plate of the ventilation cabinet below the water valve, a grid plate 82 installed in a matched mode with the flow guide notch is laid on the flow guide notch, and the grid plate 82 is used for preventing objects in the ventilation cabinet from falling to the flow guide notch and preventing the flow guide notch from being blocked; the guide groove 81 is connected to a drain tank 83 installed at the bottom of the surface of the hood through a drain pipe, and the liquid collected by the drain tank 83 is collected into a main drain pipe 84 provided with a drain valve, and the main drain pipe discharges the liquid to a place to be discharged.
As shown in fig. 4, the fume hood 7 includes an air supply system 3 installed at the bottom end and the rear end of the fume hood 7 for supplying air to the inside of the fume hood 7; the air supplementing system 3 further comprises an air supplementing and flow stabilizing device 30, an air supplementing and speed increasing device 31 and an air supplementing pipeline 32, wherein the air supplementing pipeline 32 is sequentially connected with a first manual valve 61, a second automatic regulating valve, the air supplementing and speed increasing device 31 and the air supplementing and flow stabilizing device 30; outdoor air is accelerated by the air supplementing and accelerating device 31 (Venturi effect) and stably conveys fresh air to all directions in the ventilation cabinet 7 through the air supplementing and flow stabilizing device 30, so that the problem of turbulence or turbulent flow existing when air flow is supplemented into the ventilation cabinet 7 is solved, and air supplementing noise is reduced;
as shown in fig. 5, the air supplementing and speed increasing device 31 has a tubular structure, one end of which is provided with an air inlet cavity, the volume of the air flowing in the air inlet cavity gradually decreases and gradually increases to the air outlet cavity, the air outlet of the air outlet cavity is a long strip-shaped gap, and the air inlet cavity and the air outlet cavity are in arc transition. The air outlet cavities of the two air-supplementing speed-increasing devices 31 are connected with an air-supplementing current-stabilizing device 30 to form a communicated structure in a shape like a Chinese character 'kou'; as shown in fig. 6, the air supplementing and flow stabilizing device 30 is an internal hollow member, the hollow member is provided with a notch connected with the air outlet of the air supplementing and speed increasing device 31, the side surfaces of the two hollow members opposite to each other and adjacent to the notch are provided with a plurality of ventilation slots, the gas slowly enters the working environment due to the shunting action of the ventilation slots, the turbulence of the air flow is reduced, and the air supplementing noise is reduced. As shown in fig. 3, the air in the air supply duct 32 enters from the air inlet cavity of the air supply speed increasing device 31, enters the air supply flow stabilizing device 30 through the air outlet of the gap with the size changing from large to small, and then enters the cabinet body through the ventilation slot.
As shown in fig. 7, the exhaust system 1 is disposed on the top of the hood 7; the exhaust system 1 comprises an exhaust duct 10, a second manual valve 63, a second automatic valve 62 and a gas collecting hood 33 which are sequentially communicated, and the gas collecting hood 33 collects gas to be exhausted inside the fume hood 7. Considering that the gas passing through the air outlet is viscous gas, the drift diameter of the air supply port and the drift diameter of the air outlet are arranged according to a preset proportion, and meanwhile, the air inlet and the air outlet are both provided with a manually controlled valve and a valve controlled and adjusted by the control system 4, so that the balance state of the air supply flow and the air exhaust flow in the working cavity of the fume hood 7 is ensured.
As shown in fig. 3, the gas guiding device is disposed inside the fume hood 7, and the gas guiding device guides air entering from the air supply system 3 and the whole airflow in the fume hood 7 to circulate in a steady state, and discharges waste gas and particles in time through the exhaust outlet of the exhaust system 1; the gas guide device comprises a guide plate 5 fixed inside a fume hood 7; the guide plate 5 is provided with a plurality of through holes, and the through holes are convenient for flowing gas in the fume hood 7 to orderly enter the exhaust system 1; the air supplied by the air supply system 3 enters the exhaust system 1 through the gap between the side wall of the fume hood and the guide plate 5 and the through holes on the guide plate 5. The flow direction of the guide plate 5 guides the flow of the air to guide the air supplement output from the air supplement flow stabilizing device 30 to the exhaust system 1 at the top; the guide plate 5 comprises a top guide plate 5 and a back guide plate 5, one end of the top guide plate 5 is fixedly connected with the top of the ventilation cabinet 7, and the other end of the top guide plate 5 is fixedly connected with the back guide plate 5; the top guide plate and the back guide plate form a preset gap with the side wall of the ventilation cabinet, and the wind discharged from the wind supplementing and current stabilizing device is guided to flow through the operation space and then to the exhaust system, so that the supplemented wind can effectively take away the waste gas.
The pressure detection device (not marked in the figure) is arranged at an air supply opening of the air supply system 3 and an air exhaust opening of the exhaust system 1 and is used for controlling the balance between the air pressure in the fume hood 7 and the indoor pressure and preventing harmful gas and particles from overflowing the working cavity; the pressure detection device compares the detected gas pressure value with a gas pressure value preset in the control system 4, and the obtained comparison result is fed back to the control system 4 to control the opening and closing of the first automatic valve 60 and the second automatic valve 61.
The safety mutual inspection alarm device (not marked in the figure) is arranged at an air supplement port of the air supplement system 3 and an air exhaust port of the exhaust system 1 and sends out alarm signals when equipment fails; effectively prevent the accidents of harmful substance diffusion and leakage to the indoor environment caused by equipment failure caused by various uncertain factors.
As shown in fig. 1, the control system 4 is disposed at an upper side of the fume hood 7, and is configured to control the air supplement system 3, the exhaust system 1, and the automatic regulating valve to transmit the detected air flow value to the control system 4, and the control system 4 compares the air flow value with a preset air flow value to control the air supplement flow and the exhaust flow in the fume hood 7 to reach a balanced state.
As shown in fig. 1 and 2, it is preferable that the fume hood 7 is provided with a lift gate rail mechanism at both sides thereof and a glass door 70 mounted thereon, and the opening and closing of the glass door 70 is controlled manually or by the control system 4. When the glass door 70 is opened to a preset range, the air film with pressure and flow speed output by the air supplementing and flow stabilizing device 30 can effectively prevent the diffusion and blending of the air in the working cavity of the fume hood 7 and the indoor air outside the fume hood 7, so that the overall safety of the indoor air is ensured, and the energy consumption of an indoor air conditioner can be effectively reduced.
Preferably, the fume hood 7 is fixed on a support 71, and the support 71 is built by steel frames and beams which are connected through tenons and screws. The fume hood 7 of the bracket 71 is placed more smoothly, the working table surface in the fume hood 7 is horizontal and is not easy to incline, and the bottom of the fume hood 7 is not easy to corrode.
Preferably, the periphery of the bottom of the fume hood 7 is provided with an auxiliary exhaust system 2 for connecting the additional device of the fume hood 7 into the exhaust system 1; the auxiliary exhaust duct 21 of the auxiliary exhaust system 2 is connected with the exhaust duct 10 of the exhaust system 1, and the auxiliary exhaust duct 21 is connected with the auxiliary exhaust joint 20. The auxiliary exhaust pipe 21 can conveniently connect the additional devices on the equipment, such as various storage cabinets and the like, into the equipment exhaust system 1, thereby ensuring that various harmful and volatile materials are stored and the ventilation of the collection cabinet body is smooth, and creating a comfortable and safe working environment.
The ventilation working principle of the ventilation cabinet of the embodiment is as follows: the air enters the air supplementing accelerating device from an air supplementing pipeline of the air supplementing system and then enters the air supplementing flow stabilizing device, and then enters the working space inside the fume hood, and the supplemented air and the air in the working space enter the air collecting hood through a gap formed by the guide plate and the side wall of the fume hood and through holes formed in the guide plate and then are discharged by the exhaust system.
The above-described embodiments are merely illustrative of the embodiments of the present invention, and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and all of them should fall into the protection scope of the present invention.
Claims (10)
1. An adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet is characterized by comprising:
the air supplementing system is arranged at the bottom end and the rear end of the fume hood and is used for supplementing air to the interior of the fume hood;
the exhaust system is arranged at the top of the fume hood and used for exhausting gas in the fume hood;
the water collecting and draining system is arranged at the bottom of the fume hood and is used for supplying water to the fume hood and collecting liquid in the fume hood;
and the control system is arranged on the side edge of the upper part of the fume hood and is used for controlling the air supplementing system to perform air supplementing operation or controlling the exhaust operation of the exhaust system so as to enable the air supplementing flow and the exhaust flow in the fume hood to reach a balanced state.
2. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet as claimed in claim 1, wherein more than two water supply pipelines are installed inside the ventilation cabinet, and an independent water valve is configured, a diversion notch is formed at a corresponding position of the bottom plate of the ventilation cabinet below the water valve, a grid plate matched with the diversion notch is laid on the diversion notch, the diversion notch is connected with a drainage tank installed at the bottom of the surface of the ventilation cabinet through a drainage pipeline, liquid collected by the drainage tank is collected into a main drainage pipeline, a drainage valve is configured on the main drainage pipeline, and the main drainage pipeline discharges the liquid to a place to be discharged.
3. The adjustable speed-increasing and flow-stabilizing type physicochemical safety cabinet as claimed in claim 1, wherein the air-supplementing system further comprises an air-supplementing and flow-stabilizing device, an air-supplementing and speed-increasing device and an air-supplementing pipeline, and the air-supplementing pipeline is sequentially connected with the first manual valve, the first automatic valve, the air-supplementing and speed-increasing device and the air-supplementing and flow-stabilizing device; outdoor air is accelerated by the air supplementing and accelerating device and stably conveyed to the ventilation cabinet by the air supplementing and stabilizing device; the ventilation cabinet also comprises a gas guide device which is arranged inside the ventilation cabinet, guides air entering from the air supplementing system and the whole airflow in the ventilation cabinet to circulate in a stable state, and timely discharges waste gas and particles through an air outlet of the air exhaust system; the exhaust system comprises an exhaust pipeline, a second manual valve, a second automatic valve and a gas collecting hood which are sequentially communicated, and the gas collecting hood collects gas to be exhausted inside the ventilation cabinet.
4. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet according to claim 3, wherein the air-supplementing and speed-increasing device is tubular, one end of the air-supplementing and speed-increasing device is provided with an air inlet cavity, the volume of the air inlet cavity gradually decreases and then gradually increases to an air outlet cavity at the other end, the air outlet of the air outlet cavity is a long strip-shaped gap, and the air inlet cavity and the air outlet cavity are in arc transition; the air outlet cavity of the air supplementing and accelerating device is connected with an air supplementing and flow stabilizing device; the air supplementing and flow stabilizing device is an internal hollow part, the hollow part is provided with a notch connected with an air outlet of the air supplementing and speed increasing device, and the two hollow parts are opposite and are provided with a plurality of ventilation grooves on the side surfaces adjacent to the notch.
5. The adjustable speed-increasing flow-stabilizing physical and chemical safety cabinet as claimed in claim 3, wherein the gas guiding device comprises a guiding plate fixed inside the ventilation cabinet; a plurality of through holes are uniformly distributed on the guide plate; the air supplied by the air supply system enters the exhaust system through the gap between the side wall of the fume hood and the guide plate and the through holes on the guide plate.
6. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet according to claim 5, wherein the flow guide plate comprises a top flow guide plate and a back flow guide plate, one end of the top flow guide plate is fixedly connected with the top of the fume hood, the other end of the top flow guide plate is fixedly connected with the back flow guide plate, and the back flow guide plate is in contact with the surface of the fume hood and is spaced from the side wall of the fume hood.
7. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet according to claim 3, wherein the fume hood further comprises a pressure detection device, which is installed at an air supply opening of the air supply system and an air exhaust opening of the air exhaust system, and is used for controlling the balance between the air pressure in the fume hood and the indoor pressure; the pressure detection device compares the detected gas pressure value with a gas pressure value preset in the control system, and the obtained comparison result is fed back to the control system to control the opening and closing of the first automatic valve and the second automatic valve.
8. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet as claimed in claim 1, wherein a lifting door guide rail mechanism is installed on both sides of the ventilation cabinet, a glass door is installed on the lifting door guide rail mechanism, and the opening and closing of the glass door are controlled manually or by a control system; the fume chamber is fixed on a support, and the support is built by a steel frame and a cross beam which are connected through tenons and screws.
9. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet according to claim 1, further comprising an auxiliary exhaust system for connecting an additional device of the fume hood into the exhaust system; an auxiliary exhaust pipe of the auxiliary exhaust system is connected with an exhaust pipeline of the exhaust system, and the auxiliary exhaust pipe is connected with an auxiliary exhaust pipe joint.
10. The adjustable speed-increasing flow-stabilizing type physicochemical safety cabinet as claimed in claim 1, further comprising a safety mutual inspection alarm device, which is installed at the air supply opening of the air supply system and the air exhaust opening of the air exhaust system, and sends out an alarm signal when equipment fails.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911175094.5A CN111112271A (en) | 2019-11-26 | 2019-11-26 | Adjustable speed-increasing and flow-stabilizing type physical and chemical safety cabinet |
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| CN201911175094.5A CN111112271A (en) | 2019-11-26 | 2019-11-26 | Adjustable speed-increasing and flow-stabilizing type physical and chemical safety cabinet |
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| CN111112271A true CN111112271A (en) | 2020-05-08 |
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| CN201911175094.5A Pending CN111112271A (en) | 2019-11-26 | 2019-11-26 | Adjustable speed-increasing and flow-stabilizing type physical and chemical safety cabinet |
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| CN112044907A (en) * | 2020-08-25 | 2020-12-08 | 北京印刷学院 | VOCs exhaust gas negative pressure purification treatment device in printing and packaging workshop |
| CN112710054A (en) * | 2021-01-29 | 2021-04-27 | 广东天赐湾实验室装备制造有限公司 | Fume hood capable of forced downward air supply |
| CN113058961A (en) * | 2021-04-01 | 2021-07-02 | 惠特环境科技有限公司 | Laboratory explosion-proof fume chamber |
| CN114453375A (en) * | 2020-11-09 | 2022-05-10 | 实验室融合有限责任公司 | Air volume adjustable type fume hood equipment |
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