Air curtain jet energy-saving fume hood

Abstract

The utility model belongs to the technical field of fume hoods, and provides an air curtain jet energy-saving fume hood, comprising a cabinet body, a sliding door, an exhaust port, an air supply port and an air curtain jet part arranged on the cabinet body. The air curtain jet part comprises a fan and a jet slit, and the fan supplies air to the jet slit and thus supplies air into the cabinet body. The air curtain blows into the cabinet body, which blocks the outflow of pollutants generated by the experiment to a large extent, forming an effective barrier. The fan can adjust the power according to different pollutant emission conditions, further enhancing the effect of the wind curtain and making ventilation more orderly. The wind speed of the fan can be adjusted according to the emission conditions or specific gravity of different pollutants, and is not limited by individual pollutants. The fume hood of the utility model is flexible and can be adjusted according to different experimental conditions and needs, which makes the fume hood more adaptable and suitable for different types of experiments.

Description

Technical Field

[0001] The utility model belongs to the technical field of fume hoods, and in particular relates to an air curtain jet energy-saving fume hood. Background Art

[0002] Fume hoods are important local ventilation equipment for chemical laboratory environmental control and an important component for ensuring the health and safety of chemical researchers. They are widely used in laboratories of colleges and universities, government agencies, and corporate institutions. When researchers perform chemical experiments on the operating table in the fume hood, under the negative pressure generated by the fume hood exhaust fan, the air will first flow into the fume hood through the fume hood operating port, and then pass through the contaminated area on the operating table in the cabinet to take away the toxic and harmful gas pollutants generated in the contaminated area and discharge them to the outside. Therefore, fume hoods are of great significance to the control of laboratory air pollutants.

[0003] In order to ensure that the pollutants inside the fume hood are kept away, commonly used fume hoods usually need to exhaust a large amount of air so that the door operation area reaches a certain surface wind speed (0.5m / s) to ensure that the pollutants in the cabinet will not spread into the interior of the room; but in order to ensure that the room is at normal pressure, it is necessary to carry out air supply with a volume equivalent to the exhaust volume, which increases the ventilation energy consumption. If the experimental environment in the room requires temperature and humidity control, then the air conditioning energy consumption brought by the air supply is very huge.

[0004] If there is a fume hood that can discharge pollutants in the fume hood while reducing the amount of air entering from the door, then such a fume hood can not only reduce the energy consumption of the ventilation system, but also greatly reduce the air conditioning energy consumption required for air supply. Such a fume hood will have a wide range of application value. Utility Model Content

[0005] The utility model is developed to solve the above-mentioned problems, and its purpose is to provide an air curtain jet energy-saving fume hood, which forms a replacement airflow organization in the hood under the premise of extremely small fume hood surface wind speed through the way of air supply and jet induction in the hood, so as to discharge pollutants in the hood while reducing ventilation and air-conditioning energy consumption.

[0006] The utility model provides an air curtain jet energy-saving fume hood, which has the following characteristics: a cabinet body; a sliding door, which is arranged on the cabinet body; an exhaust port, which is located at the top of the cabinet body and is used to exhaust the gas in the cabinet body; an air supply port, which is located at the top of the cabinet body and is used to supply new air into the cabinet body; an air curtain jet part, which is arranged at the bottom of the cabinet body and below the sliding door, and is used to generate an induced airflow to supply air into the cabinet body; wherein the air curtain jet part includes a fan and jet slits, and the fan supplies air to the jet slits so as to supply air into the cabinet body.

[0007] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: wherein, the wind curtain jet part also includes a shell and a jet unit located in the shell, the fan is located in the shell and below the jet unit; the jet unit includes a jet strip, two anti-overflow arc plates and a fan-shaped connecting plate, the jet strip is used to supply air into the cabinet, and the two anti-overflow arc plates are respectively connected to the two sides of the jet strip; the arc end of the fan-shaped connecting plate is connected to the two anti-overflow arc plates and the end side surfaces of the jet strip, the center end of the fan-shaped connecting plate is connected to the fan by a rivet, the shell has a guide plate matching the anti-overflow arc plate, and a limiting opening is opened on the guide plate; the fan-shaped connecting plate can rotate around the rivet to drive the jet strip to move in the limiting opening.

[0008] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: wherein the adjustable angle of the jet slit is 30° to 80°, and the guide plate is an arc-shaped plate of 1 / 4 circle.

[0009] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: a position sensor is provided on the hood body for measuring the opening of the sliding door; an exhaust valve is installed at the exhaust port, and an air supply valve is installed at the air supply port.

[0010] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: wherein the position sensor is a pull-rope displacement sensor, the exhaust valve is electrically connected to the exhaust motor, and the supply air valve is electrically connected to the supply air motor.

[0011] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: a control unit is also provided on the cabinet body, the control unit includes a control chip and a control screen, and the control chip is communicatively connected with the exhaust motor, the air supply motor, the fan and the displacement sensor.

[0012] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: an air supply static pressure box connected to the air supply port is arranged below the air supply port, and an air supply plate is arranged below the air supply static pressure box, which is a perforated plate obliquely installed in the cabinet body.

[0013] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: wherein the angle between the perforated plate and the sliding door is 40° to 30°, and a plurality of evenly arranged circular holes are evenly distributed thereon.

[0014] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: an exhaust guide plate is installed in the cabinet below the exhaust port, the lower part of the exhaust guide plate is parallel to the back plate of the cabinet, the upper part is inclined, and the upper end of the upper part is connected to the top plate of the cabinet.

[0015] The wind curtain jet energy-saving fume hood provided by the utility model may also have the following features: wherein the fan is driven by a frequency converter, the jet wind speed at the outlet of the jet slit is 1 to 4 m / s, and the air volume is 50 to 200 m 3 / h.

[0016] Functions and effects of utility models

[0017] The wind curtain jet energy-saving fume hood provided by the utility model comprises a cabinet body, a wind curtain jet part, an air supply port and an air exhaust port, and a jet slit is arranged at the bottom of the fume hood so that the airflow forms a wind curtain. The wind curtain is blown into the cabinet body, which blocks the outflow of pollutants generated by the experiment to a great extent, forming an effective barrier, and the fan can adjust the power according to different pollutant emission working conditions, further enhancing the effect of the wind curtain and making the ventilation more orderly.

[0018] Since the density of pollutants generated in the fume hood varies greatly, the initial velocity of emission also varies widely, and there is a possibility of leakage from the sliding door into the laboratory. The wind curtain jet part can generate high-speed induced airflow, which can control the pollutants inside the fume hood. The wind curtain jet part adopts a high-flow rate and small air volume method, and adapts to different experimental operation types and pollutant emission conditions in the fume hood by adjusting the fan speed. Therefore, the wind speed of the fan can be controlled according to the emission or specific gravity of different pollutants, without being restricted by individual pollutants. The fume hood provided by the utility model is flexible and can be adjusted according to different experimental conditions and needs, which makes the fume hood more adaptable and suitable for different types of experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an air curtain jet energy-saving fume hood in an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the wind curtain jet energy-saving fume hood in the embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the internal structure of the wind curtain jet energy-saving fume hood from another angle in the embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of the internal structure of the wind curtain jet energy-saving fume hood from another angle in the embodiment of the utility model;

[0023] Figure 5 It is a right view of the internal structure of the air curtain jet energy-saving fume hood in the embodiment of the utility model;

[0024] Figure 6It is a structural schematic diagram of the wind curtain jet part in the embodiment of the utility model;

[0025] Figure 7 It is a schematic diagram of the structure of the jet slit in the embodiment of the utility model;

[0026] Figure 8 yes Figure 7 A partial enlarged view of

[0027] Fig. 9 It is a structural schematic diagram of another state of the wind curtain jet part in the embodiment of the utility model;

[0028] Fig.10 yes Fig. 9 A partial enlarged view of .

[0029] Explanation of the accompanying figures: wind curtain jet energy-saving fume hood 100, cabinet body 10, sliding door 20, air supply port 30, exhaust port 40, wind curtain jet part 50, control part 60, fume hood side panel 11, back panel 12, front panel 13, operating table 14, main part 21, rope 22, pulley 23, air supply valve 31, air supply plate 32, air supply static pressure box 33, air supply motor 34, exhaust valve 41, exhaust guide plate 42, exhaust hole 43, exhaust motor 44, shell 51, fan 52, jet slit 53, anti-overflow arc plate 54, fan-shaped connecting plate 55, guide plate 56, limit port 57, air inlet 58. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the wind curtain jet energy-saving fume hood of the utility model is specifically described below in combination with embodiments and drawings.

[0031] <Example>

[0032] This embodiment specifically describes the structure of the air curtain jet energy-saving fume hood 100.

[0033] like Figures 1 to 5 As shown, the air curtain jet energy-saving fume hood includes a cabinet body 10, a sliding door 20, an air supply port 30, an air exhaust port 40, an air curtain jet part 50 and a control part 60.

[0034] The cabinet body 10 is composed of two parallel fume hood side panels 11, a back panel 12 and a front panel 13 perpendicular to the side panels, and a top panel. The front panel 13 is relatively small in area and is installed on the upper half of the cabinet body 10. Guide rails are installed on the two side panels. The bottom of the cabinet body 10 is an operating table 14.

[0035] The sliding door 20 is installed in the guide rail on the side plate 11 and is equipped with a damping device so that the sliding door 20 can move up and down and hover at any position.

[0036] A position sensor is installed on the sliding door 20, which can feedback the current position of the sliding door 20. The position sensor is a pull rope displacement sensor. The position sensor includes a main body 21, a rope 22 and a pulley 23. The main body 21 is fixed on the air supply plate 32, one end of the rope 22 is fixedly connected to the roller in the main body 21, and the other end passes through the pulley 23 and is fixedly connected to the sliding door 20. When the sliding door 20 moves up and down, the opening degree of the sliding door 20, that is, the current position, is measured by the number of turns of the pulley 23.

[0037] There are two front and rear holes on the top plate of the cabinet body 10 of the fume hood. The hole near the front plate 13 is connected to the air supply port 30, and the hole near the back plate 12 is connected to the exhaust port 40. The air supply port 30 and the exhaust port 40 are both tubular and are respectively connected to corresponding pipelines in the outside world. The air supply port 30 is used to supply fresh air to the cabinet body; the exhaust port 40 is used to discharge the gas in the cabinet body. An air supply valve 31 is installed in the air supply port 30, and an exhaust valve 41 is installed in the exhaust port 40. The exhaust valve is electrically connected to the exhaust motor, and the air supply valve is electrically connected to the air supply motor. The exhaust motor and the air supply motor have the same structure and function, and both can reciprocate to control the opening of the air supply valve or the exhaust valve to control the air supply volume or exhaust volume.

[0038] An air supply static pressure box 33 connected to the air supply port 30 is provided below the air supply port 30. The air supply static pressure box 33 passes through the top plate of the cabinet 10. Inside the cabinet 10, an air supply plate 32 is fixed below the air supply static pressure box. The air supply plate 32 is a perforated plate, which is obliquely installed in the cabinet 10 and has an angle of 40° to 30° with the sliding door 20. There are a plurality of evenly arranged circular holes distributed on the air supply plate 32. Each row of circular holes is spaced a certain distance apart. In order to achieve a replacement effect of the supply and exhaust airflow in the fume hood and remove pollutants, the air supply plate 32 is a perforated plate and has an angle of 40° to 30° with the sliding door 20.

[0039] An exhaust guide plate 42 is installed in the cabinet 10 below the exhaust port 40, and an exhaust hole 43 is arranged on the exhaust guide plate 42. The lower part of the exhaust guide plate 42 is parallel to the back plate 12 of the cabinet, the upper part is inclined, and the upper end of the upper part is connected to the top plate of the cabinet 10. A certain gap is left between the lower end of the exhaust guide plate 42 and the operating table 14, which is used to form an airflow attached to the table surface inward to remove pollutants generated during the experiment. The upper part of the exhaust guide plate 10 is installed at an angle to separate the air supply port 30 from the exhaust air flow to avoid the air flow from short-circuiting here. The wind direction of the supplementary outdoor fresh air is from top to bottom, entering from the air supply port 30, passing through the air supply static pressure box 33, and then entering the cabinet 10 from the air supply plate 32. The direction of exhaust is from bottom to top, and the airflow in the cabinet is discharged upward from the exhaust port 40 along the exhaust guide plate 42 under the action of the external exhaust fan. Therefore, the replacement airflow formed by the supply air and exhaust air prevents the pollutants from spreading outside the fume hood.

[0040] like Figures 6 to 10As shown, the air curtain jet part 50 is arranged at the bottom of the cabinet and below the sliding door, and is used to supply air into the cabinet 10. Figure 6 , 9 In the figure, part of the housing at the fan 52 is not shown.

[0041] The wind curtain jet part 50 includes a housing 51 , and a fan 52 and a jet slit unit located in the housing 51 , wherein the fan 52 is located below the jet slit unit.

[0042] The jet slit unit includes a jet slit 53 , two anti-overflow arc plates 54 and two fan-shaped connecting plates 55 .

[0043] The housing 51 has a guide plate 56 that matches the overflow prevention arc plate 54, and a limit opening 57 is opened on the guide plate 56. The guide plate is a 1 / 4 circle arc plate, and the extension direction of the limit opening 57 is consistent with the extension direction of the guide plate 56, and is narrow and long. A plurality of air inlets 58 are opened on the side of the housing 51 at the fan 52.

[0044] The jet slit 53 is hollow and extends out of the limit opening 57, and is used to supply air into the cabinet 10. Two anti-overflow arc plates 54 are respectively connected to the two sides of the jet slit 53. Two fan-shaped connecting plates 55 have arc ends respectively connected to the two anti-overflow arc plates 54 and the two end side surfaces of the jet slit 53, and the center ends are respectively connected to the two ends of the fan 52 through rivets.

[0045] Under manual control, the fan-shaped connecting plate 54 can rotate around the rivet to drive the jet slit 53 to move in the limit opening 57. Therefore, the angle between the jet slit 53 and the operating table 14 is adjustable. By moving the jet slit 53, the jet angle can be adjusted. The angle of the jet slit 53 can be manually adjusted within a certain range to adapt to different pollutant emission conditions in the fume hood. For example, if the initial emission speed of pollutants in the cabinet is relatively fast during the experiment, in order to avoid the jet wind curtain directly shooting at the pollutants and increase the risk of pollutants spreading indoors, the angle of the jet slit 53 can be adjusted to 80°, forming a wind curtain outside the pollutant diffusion area to control the pollutants in the cabinet. When the pollutant emission speed in the cabinet is relatively slow and the position is close to the operating table 14, the air supply angle of the slit 53 is adjusted to 30°, so that the pollutants can be controlled within a smaller range. In this embodiment, the angle of the jet slit 53 is the angle between it and the horizontal plane of the operating table 14.

[0046] The fan 52 is driven by a frequency converter, and the fan speed can be adjusted to adjust the jet intensity. Figure 7 , 8As shown in FIG. 5 , the wind generated by the fan 52 enters the housing 51 from the air inlet 58 and then blows toward the jet slits, and then blows toward the cabinet to deliver air into the cabinet. The fan is driven by a frequency converter, and the jet wind speed at the outlet of the jet slit 53 is 1 to 4 m / s, and the air volume is 50 to 200 m 3 / h. When the fan 52 rotates during operation, the indoor air acquires a certain speed at the air inlet 58 and becomes a high-speed airflow, which is then sent out from the jet slits 53, thereby generating an air curtain to block the pollutants in the fume hood and prevent them from spreading from the fume hood into the room.

[0047] The fan 52 is controlled by a variable frequency driver, and the jet wind speed at the outlet of the jet slit 53 can be adjusted by adjusting the rotation speed of the fan 52, thereby adjusting the jet distance of the jet wind speed to adapt to different pollutant emission conditions in the fume hood.

[0048] The wind curtain jet part 50 is located directly below the visible window frame sliding door 20 and at the bottom of the operation port. The jet slit 53 is 1260 mm long and 3-5 mm wide, and can be adjusted at an angle of 30°-80° with the operation table 14. The air flows out through the slit to form a jet, and the speed is controlled at 1-4 m / s, forming a wind curtain to induce airflow.

[0049] The sliding door 20 can adjust the opening of the operation port during the experiment. When fully closed, it contacts the 1 / 4 circular guide plate 56 to avoid the danger of a large amount of pollutants leaking out when working in the fume hood. When the experimenter operates, the sliding door 20 is manually pulled to a distance of 500mm from the table surface, and the sliding door 20 is pulled down to the table surface after the operation is completed.

[0050] A control unit 6 is also provided on the side of the cabinet 10. The control unit 60 includes an internal control chip and a control screen for display. The control chip is respectively connected to the exhaust motor 44, the supply air motor 34, the fan 52 and the displacement sensor. The control chip adjusts the relationship between the supply air volume, the exhaust air volume and the height of the sliding door measured by the displacement sensor. In this embodiment, the exhaust air volume remains unchanged, and the supply air volume and the frequency of the fan change as the opening of the sliding door 20 changes.

[0051] When the sliding door 20 is raised to 500 mm, due to the larger door opening space, the make-up air volume is reduced to 30% of the exhaust air volume while the exhaust air volume remains unchanged, and the frequency of the fan 52 is increased to 50 Hz. This can increase the surface wind speed of the fume hood opening below the sliding door 20, and the leakage of pollutants in the cabinet can be controlled together with the wind curtain through this surface wind speed.

[0052] When the sliding door 3 is lowered to less than 100 mm, the air volume of the supplementary air is increased to 80% of the exhaust air volume under the premise of the exhaust air volume remaining unchanged, and the frequency of the fan 52 is reduced to 30 Hz. This keeps the negative pressure in the cabinet to prevent the leakage of pollutants, and the air curtain formed by the jet blocks the opening of the fume hood.

[0053] Functions and Effects of the Embodiments

[0054] The wind curtain jet energy-saving fume hood provided in this embodiment includes a hood body, a wind curtain jet part, an air supply port and an air exhaust port. When the fume hood is in operation, the air in the hood is made more orderly through ventilation, air supply and jet induction, thereby enhancing the ventilation effect.

[0055] In this embodiment, a jet slit with an adjustable angle within the range of 30° to 80° is set at the bottom of the fume hood, and the airflow forms a wind curtain at the optimal angle. The formation of this wind curtain largely blocks the outflow of pollutants generated in the experiment, forming an effective barrier. The jet induction method adjusts the angle of the jet and the angle of the wind curtain by adjusting the jet angle, so that the wind curtain can be targeted at different pollutant emission conditions, further enhancing the effect of the wind curtain and making ventilation more orderly.

[0056] Since the density of pollutants generated in the fume hood varies greatly, the initial velocity of the emission also varies greatly, and there is a possibility of leakage from the sliding door into the laboratory. The wind curtain jet part can generate high-speed induced airflow to control the pollutants inside the fume hood. The wind curtain jet part adopts high flow rate and small air volume (jet wind speed of 1 to 4m / s), and the air volume is 50 to 200m 3 / h, and adapt to different experimental operation types and pollutant emission conditions in the fume hood by adjusting the fan speed and jet angle. Therefore, the wind speed of the fan can be regulated according to the emission or specific gravity of different pollutants, without being restricted by individual pollutants. The design of the wind curtain jet and air supply takes flexibility into account and can be adjusted according to different experimental conditions and needs, which makes the fume hood more adaptable and suitable for different types of experiments.

[0057] In this embodiment, the position of the sliding door is measured by a position sensor, and the air supply volume and the speed of the fan are adjusted according to the sliding door position. When the sliding door is at a higher position and the fume hood opening is larger, in order to reduce the leakage of pollutants, the indoor air intake should be increased to form a uniform inward airflow at the opening, and a high-speed jet air curtain should be used to control the leakage of pollutants. However, when the sliding door is at a higher position and the fume hood opening is smaller, the probability of pollutant leakage is reduced. At this time, the fume hood maintains a negative pressure, and the jet can be used to ensure that pollutants do not leak into the room. Increasing the proportion of the air supply flow can utilize the displacement effect to prevent pollutants from being retained in the fume hood and leaking into the room through the gaps in the fume hood.

[0058] The fume hood can adjust the proportion of make-up air volume to exhaust air volume and the operating frequency of the fan according to the position of the sliding door. When the sliding door is raised to 500mm, the make-up air volume is reduced to 30% of the exhaust air volume, and the fan frequency is increased. When the sliding door is lowered, the make-up air volume is increased to 80% of the exhaust air volume, and the fan frequency is reduced. This can further reduce ventilation energy consumption and laboratory air conditioning energy consumption while controlling pollutant leakage.

[0059] In this embodiment, when the experimental operation is performed on the operating table, pollutants may be generated along with the experimental operation. The exhaust port is connected to the exhaust duct, which generates an airflow convergence with the exhaust guide plate, so that the pollutants flow to the back plate with the airflow. Since the air in the laboratory is heat and humidity treated air, if a large amount of air enters the cabinet of the fume hood from the sliding door and is discharged through the exhaust guide plate and the exhaust port, then in order to maintain the indoor pressure, the air added to the room needs to be heat and humidity treated, which will consume a lot of energy. By sending the make-up air into the fume hood from the make-up air port of the fume hood, outdoor air that has not been heat and humidity treated can be used for make-up air, avoiding the energy consumption of heat and humidity treatment.

[0060] The air inlet is set at the top front side of the fume hood to obtain fresh air from the outside that has not been treated by air conditioning. After the fresh air enters the air inlet, it flows to the air supply static pressure box. The air velocity in this space decreases to zero, and the dynamic pressure is converted into static pressure. The static pressure at each point is approximately the same, so that the air outlet can achieve the effect of uniform air supply and then send it to the air supply plate. The air supply plate is inclined and porous to make the air supply more uniform. The exhaust guide plate is located at the rear side of the cabinet to optimize the air flow organization. The exhaust air is sent out from the exhaust port, forming a replacement effect in the fume hood to quickly discharge the pollutants generated by the experiment.

[0061] Air supply also plays an important role in improving ventilation effect. During the operation of the fume hood, a certain amount of indoor air will inevitably be discharged in order to remove indoor pollutants. In order to maintain the indoor pressure environment, the air supply volume needs to be increased, and the increase in air supply volume will increase ventilation and air conditioning energy consumption. The air supply system directly supplies fresh air into the fume hood to form a replacement airflow, which can reduce the discharge of indoor air through the fume hood while discharging pollutants, thus reducing the air supply volume and reducing ventilation energy consumption and air conditioning energy consumption.

[0062] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. An air curtain jet energy-saving fume hood, characterized in that: include: Cabinet; A sliding door is arranged on the cabinet body; An exhaust port, located at the top of the cabinet, for exhausting the gas in the cabinet; An air supply port, located at the top of the cabinet, for supplying fresh air into the cabinet; An air curtain jet part is arranged at the bottom of the cabinet and below the sliding door, and is used to generate an induced airflow to supply air into the cabinet; Wherein, the wind curtain jet part includes a fan and jet slits, The fan supplies air to the jet slits and thus supplies air into the cabinet.

2. The air curtain jet energy-saving fume hood according to claim 1 is characterized in that: in, The wind curtain jet part also includes a shell and a jet unit located in the shell. The fan is located in the housing and below the jet unit; The jet unit includes the jet slit, two anti-overflow arc plates and a fan-shaped connecting plate. The jet slit is used to supply air into the cabinet, and the two anti-overflow arc plates are respectively connected to two sides of the jet slit; The arc-shaped end of the fan-shaped connecting plate is connected to the end side surfaces of the two anti-overflow arc-shaped plates and the jet slits, and the center end of the fan-shaped connecting plate is connected to the fan by rivets. The shell has a guide plate matching the overflow prevention arc plate, and a limiting opening is formed on the guide plate; The fan-shaped connecting plate can rotate around the rivet to drive the jet slit to move in the limiting opening.

3. The air curtain jet energy-saving fume hood according to claim 2 is characterized in that: in, The adjustable angle of the jet slit is 30° to 80°, and the guide plate is a 1 / 4 circle arc plate.

4. The air curtain jet energy-saving fume hood according to claim 1 is characterized in that: in, The cabinet is provided with a position sensor for measuring the opening of the sliding door; An exhaust valve is installed at the exhaust port, and an air supply valve is installed at the air supply port.

5. The air curtain jet energy-saving fume hood according to claim 4 is characterized in that: in, The position sensor is a pull-rope displacement sensor, the exhaust valve is electrically connected to the exhaust motor, and the supply air valve is electrically connected to the supply air motor.

6. The air curtain jet energy-saving fume hood according to claim 5 is characterized in that: in, The cabinet is also provided with a control unit, which includes a control chip and a control screen. The control chip is communicatively connected with the exhaust motor, the air supply motor, the fan and the displacement sensor.

7. The air curtain jet energy-saving fume hood according to claim 6 is characterized in that: in, An air supply static pressure box connected to the air supply port is arranged below the air supply port, and an air supply plate is arranged below the air supply static pressure box. The air supply plate is a perforated plate obliquely installed in the cabinet.

8. The air curtain jet energy-saving fume hood according to claim 7 is characterized in that: in, The included angle between the perforated plate and the sliding door is 40° to 50°, and a plurality of evenly arranged circular holes are evenly distributed on the perforated plate.

9. The air curtain jet energy-saving fume hood according to claim 7, characterized in that: in, An exhaust air guide plate is installed in the cabinet below the exhaust port, the lower part of the exhaust air guide plate is parallel to the back plate of the cabinet, the upper part is inclined, and the upper end of the upper part is connected to the top plate of the cabinet.

10. The air curtain jet energy-saving fume hood according to claim 1, characterized in that: in, The fan is driven by a frequency converter, the jet velocity at the jet slit outlet is 1-4 m / s, and the air volume is 50-200 m 3 / h.

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