CN211400209U - Adjustable speed-increasing and flow-stabilizing type energy-saving physical and chemical safety cabinet - Google Patents

Abstract

The utility model provides an adjustable speed-increasing and flow-stabilizing type energy-saving physical and chemical safety cabinet, belonging to a novel ventilation device, which comprises an air supplementing system, arranged at the bottom end and the rear end of a ventilation cabinet and 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 air guide device is arranged inside the fume hood, guides air entering from the air supplementing system and the whole airflow in the fume hood to circulate in a stable state, and timely discharges waste air through an air outlet of the air discharging system; the pressure detection device and the safety mutual detection alarm device control the balance between the air pressure in the fume hood and the indoor pressure and send out an alarm signal when equipment fails; the control system controls the air supply flow and the air exhaust flow in the fume hood to reach a balanced state; the utility model discloses safety cabinet simple to operate can prevent that harmful gas, granule in the work cavity from spilling over, reduces ventilation equipment noise at work, guarantees that the experimenter operational environment is safe, comfortable.

Description

Adjustable speed-increasing and flow-stabilizing type energy-saving physical and chemical safety cabinet

Technical Field

The utility model relates to a ventilation technology field especially relates to an energy-conserving physics and chemistry safety cabinet of adjustable acceleration rate steady flow type, belongs to a neotype ventilation equipment.

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 in parallel with a plurality of indoor sets, the flow of an air supply system and an air exhaust system of the air supply type ventilation equipment 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 air exhaust control are not linked, once the air exhaust system fails, the air exhaust stops working, the air supply is still 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.

SUMMERY OF THE UTILITY MODEL

To the problem, the utility model provides an energy-conserving physics and chemistry safety cabinet of adjustable acceleration rate steady flow type mainly solves the problem that prior art ventilation equipment consumed the energy big and mend the unable air supplement airflow volume of adjusting of wind system.

The utility model provides an energy-conserving physics and chemistry safety cabinet of adjustable acceleration rate steady flow type, include:

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 air supplementing system also comprises an air supplementing and flow stabilizing device, an air supplementing and speed increasing device and an air supplementing channel, wherein the air supplementing channel 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 conveys fresh air to each direction in the ventilation cabinet by the air supplementing and stabilizing device;

the exhaust system is arranged at the top of the fume hood and used for exhausting gas in the fume hood;

the gas guiding device is arranged in the ventilation cabinet and guides air entering from the air supplementing system and the whole airflow in the ventilation cabinet to circulate in a stable state, and waste gas and particles are discharged in time through an air outlet of the exhaust system.

Further, the control system is arranged on the side edge of the upper part of the fume hood and used for controlling the air supplementing system, the exhaust system and the automatic regulating valve to transmit the detected air flow value to the control system, and the control system compares the detected air flow value with the preset air flow and controls the air supplementing flow and the exhaust air flow in the fume hood to reach a balanced state; the middle part of the air supplementing and speed increasing device is provided with an air inlet cavity, the air circulation structures at two sides of the air inlet cavity are symmetrically arranged, the volume of the air inlet cavity is gradually reduced, the air inlet cavity is gradually enlarged 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.

Furthermore, air outlet cavities on two sides of the air supplementing and accelerating device are respectively connected with an air supplementing and current 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 uniformly provided with a plurality of ventilation grooves on the side surfaces adjacent to the notch.

Further, exhaust system is including the exhaust pipe, the manual valve of second, the automatic valve of second and the gas collecting channel that communicate in proper order, the gas collecting channel gathers the inside gas of treating the emission of fume chamber.

Further, the gas guiding device comprises a partition board fixed at the bottom of the fume hood and a guiding board connected with the top of the fume hood; the two guide plates are respectively fixed on the two sides of the partition plate, and a plurality of through holes are formed in the guide plates; the air supplemented by the air supplementing system enters the exhaust system through the gap between the partition plate and the guide plate and the through holes on the guide plate.

Further, the guide plate comprises a top guide plate and a back guide plate, one end of the top guide plate is fixedly connected with the top of the ventilation cabinet, and the other end of the top guide plate is fixedly connected with the back guide plate; a funnel shape is formed between the two guide plates.

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 sequentially connected with an auxiliary exhaust valve, a gas collecting box and an auxiliary exhaust connecting pipe.

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 utility model has the advantages that:

1. 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;

2. the bottom surface in the fume hood is provided with a partition plate and 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;

3. 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, and a gas pressure value detected by a pressure detection device is compared with a gas pressure value preset in a control system and 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 system is improved, and the energy-saving ventilation cabinet is a safe ventilation cabinet; meanwhile, the manual valve can adjust the gas flow rate by hands to perform adaptive fine adjustment.

4. 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;

5. the ventilation cabinet is also provided with a flexible auxiliary exhaust duct, and an additional device on the ventilation equipment can be conveniently connected into an exhaust system, so that the ventilation of various harmful and volatile materials is ensured to be smooth, and a comfortable and safe working environment is created.

Drawings

Fig. 1 is a schematic structural diagram of a safety cabinet according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a safety cabinet according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a safety cabinet from air intake to air exhaust according to an 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 airflow diagram of the wind-supplementing speed-increasing device and the wind-supplementing current-stabilizing device of the safety cabinet according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a wind-supplying and speed-increasing device of a safety cabinet according to an embodiment of the present invention;

fig. 7 is a schematic structural view of an air-supplementing and current-stabilizing device of a safety cabinet according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an exhaust system of a 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 valve; 21. a gas collection box; 22. an auxiliary exhaust connecting pipe; 23. 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; 52. a partition plate; 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. and (4) a bracket.

Detailed Description

In order to deepen the understanding of the present invention, the following embodiments will be combined to make the present invention do further details, and the present embodiment is only used for explaining the present invention, and does not constitute the limitation of the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, 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 for those skilled in the art. The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 1 to 8, an adjustable speed-increasing and flow-stabilizing type energy-saving physicochemical safety cabinet can supplement outdoor natural wind into a working environment without being processed by an air conditioner, thereby saving energy; the air supplementing speed increasing device, the air supplementing current stabilizing device and the valve are arranged, so that the speed and the air quantity of the air supplement can be adjusted, the ventilation cabinet is more energy-saving and environment-friendly, and the air supplement can be controlled according to requirements to prevent accidents caused by leakage of toxic air flow which is not discharged from an exhaust system.

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 through pipeline 32, wherein the air supplementing pipeline 32 is sequentially connected with a first manual valve 61, a first automatic valve 60, 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. 6, the middle of the air supplementing and speed increasing device 31 is provided with an air inlet cavity, the air circulation structures on both sides of the air inlet cavity are symmetrically arranged, the volume of the air inlet cavity gradually decreases, the air inlet cavity 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 at the two sides of the air supplementing and accelerating device 31 are respectively connected with an air supplementing and current stabilizing device 30, and specifically, the upper parts of the two air supplementing and accelerating devices 31 are connected with the two air supplementing and current stabilizing devices 30 to form a mutually communicated 'square-shaped' structure; as shown in fig. 7, 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 by 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 and 5, the air in the air supply duct 32 enters the square air inlet cavity from the bottom cylindrical air inlet duct of the air supply speed increasing device 31, then is divided into two paths, passes through the air circulation structures on both sides of the air inlet cavity, and enters the air supply flow stabilizing device 30 through the air outlet of the gap with the volume changing from large to small, and then enters the cabinet body through the ventilation groove.

As shown in fig. 8, the exhaust system 1 is provided 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 partition plate 52 fixed at the bottom of the fume hood 7 and a guide plate 5 connected with the top of the fume hood 7; the two guide plates 5 are respectively fixed on two sides of the partition plate 52, and a plurality of through holes are formed in the guide plates 5, so that flowing gas in the fume hood 7 can enter the exhaust system 1 orderly; the air supplied by the air supply system 3 enters the exhaust system 1 through the gap between the partition plate 52 and the guide plate 5 and the through holes on the guide plate 5. The baffle plate 52 and the guide plate 5 guide the flow direction of the gas to guide the air supplement from the two sides of the air supplement and flow stabilization device 30 to the exhaust system 1 at the top in the middle; 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; a funnel shape is formed between the two guide plates 5.

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. The control system 4 is a common technical device in the prior art, such as a common controller of a PLC, a single chip microcomputer, etc., and therefore, the control system is not described herein.

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; an auxiliary exhaust duct 23 of the auxiliary exhaust system 2 is connected with the exhaust duct 10 of the exhaust system 1, and the auxiliary exhaust duct 23 is sequentially connected with an auxiliary exhaust valve 20, a gas collecting box 21 and an auxiliary exhaust connecting pipe 22. The auxiliary exhaust pipe 23 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 gas collecting box 21 is used for collecting all auxiliary exhaust pipelines and then is connected to the main exhaust pipe through a pipeline for unified exhaust, and meanwhile, the gas collecting box contains a drying agent for removing moisture in the auxiliary exhaust pipelines and reducing the corrosion influence of the moisture on the pipelines.

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 partition plate 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. Under the prerequisite that does not deviate from the design concept of the utility model, the ordinary person in the art should fall into the protection scope of the utility model to the various changes and improvements that the technical scheme of the utility model made.

Claims (10)

1. An adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet is a fume hood, and 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 air supplementing system also comprises an air supplementing and flow stabilizing device, an air supplementing and speed increasing device and an air supplementing channel, wherein the air supplementing channel 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 conveys fresh air to each direction in the ventilation cabinet by the air supplementing and stabilizing device;

the exhaust system is arranged at the top of the fume hood and used for exhausting gas in the fume hood;

the gas guiding device is arranged in the ventilation cabinet and guides air entering from the air supplementing system and the whole airflow in the ventilation cabinet to circulate in a stable state, and waste gas and particles are discharged in time through an air outlet of the exhaust system.

2. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as recited in claim 1, further comprising a control system, disposed at the upper side of the fume hood, for controlling the air supply system, the exhaust system, and the automatic regulating valve to transmit the detected air flow value to the control system, wherein the control system compares the detected air flow value with the preset air flow value, and controls the air supply flow and the exhaust flow in the fume hood to reach a balanced state; the middle part of the air supplementing and speed increasing device is provided with an air inlet cavity, the air circulation structures at two sides of the air inlet cavity are symmetrically arranged, the volume of the air inlet cavity is gradually reduced, the air inlet cavity is gradually enlarged 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.

3. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as claimed in claim 2, wherein the air outlet cavities at two sides of the air-supplementing and speed-increasing device are respectively 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.

4. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as claimed in claim 1, wherein the exhaust system comprises an exhaust duct, 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.

5. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as claimed in claim 1, wherein the gas guiding device comprises a partition plate fixed at the bottom of the fume hood and a guiding plate connected with the top of the fume hood; the two guide plates are respectively fixed on the two sides of the partition plate, and a plurality of through holes which are uniformly distributed are arranged on the guide plates; the air supplemented by the air supplementing system enters the exhaust system through the gap between the partition plate and the guide plate and the through holes on the guide plate.

6. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as claimed in claim 5, wherein the guide plate comprises a top guide plate and a back guide plate, one end of the top guide plate is fixedly connected with the top of the ventilation cabinet, and the other end of the top guide plate is fixedly connected with the back guide plate; a funnel shape is formed between the two guide plates.

7. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as recited in claim 4, further comprising a pressure detection device, installed at the air supply opening of said air supply system and the air exhaust opening of said air exhaust system, for controlling the balance between the air pressure in the ventilation cabinet 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 energy-saving physicochemical safety cabinet as claimed in claim 1, wherein the two sides of the ventilation cabinet are provided with lifting door guide rail mechanisms and 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.

9. The adjustable speed-increasing flow-stabilizing type energy-saving physicochemical safety cabinet as claimed in claim 1, further comprising an auxiliary exhaust system for connecting an additional device of the ventilation cabinet 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 sequentially connected with an auxiliary exhaust valve, a gas collecting box and an auxiliary exhaust connecting pipe.

10. The adjustable speed-increasing flow-stabilizing type energy-saving 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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