Energy-saving air supply fume hood

Abstract

The invention discloses an energy-saving air supply fume hood, belonging to the technical field of fume hoods. The fume hood comprises an upper cabinet, a lower cabinet and an upper air supply system, an air collecting hood connected to an exhaust fan through an exhaust duct is provided on the top of the upper cabinet, a perspective sliding door movable in a vertical direction is provided at the operation port of the upper cabinet, a guide baffle is provided in the inner and rear sides of the upper cabinet, the upper air supply system comprises an upper air supply fan, an upper air supply duct, an upper external air supply plenum box and an upper internal air supply plenum box, the upper external air supply plenum box and the upper internal air supply plenum box are both arranged on the top of the fume hood and are respectively located at the front and rear sides of the sliding door, the upper external air supply plenum box and the upper internal air supply plenum box are closed cavities with upper external air supply ports and upper internal air supply ports respectively opened at the bottom, and the inner cavities of the upper external air supply plenum box and the upper internal air supply plenum box are respectively connected to the upper air supply fan through the upper air supply duct. Compared with the traditional fume hood, the present invention can ensure the overall sewage discharge effect of the fume hood with a smaller exhaust volume, and has low energy consumption.

Description

Technical Field

[0001] The invention relates to a fume hood, in particular to an energy-saving air-supplementing fume hood, and belongs to the technical field of fume hoods. 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] Existing fume hoods usually include an upper cabinet and a lower cabinet, wherein the upper cabinet is a hollow structure, and the top of the upper cabinet is connected to the exhaust fan through an exhaust pipe to ensure a negative pressure state in the cabinet. A vertically movable sliding door is provided at the operation port of the upper cabinet, and the size of the operation port can be controlled by vertically moving the sliding door. A guide baffle for optimizing the airflow organization in the cabinet is provided on the inner and rear sides of the upper cabinet, and the lower cabinet is a storage space. The structural design of the existing fume hood will produce gas boundary layer separation near the entrance of the fume hood and behind the sliding door, resulting in eddy currents and backflow phenomena, thereby causing the retention of gaseous pollutants in the cabinet, which is not conducive to the discharge of gaseous pollutants; in addition, the structural design of the existing fume hood is a passive confluence structure, that is, under the suction action of the exhaust fan, the cabinet maintains a negative pressure state, so that a significant pressure gradient is formed between the cabinet and the room. Under the action of the pressure gradient, air continuously flows from the room into the cabinet, and then carries the gaseous pollutants in the cabinet to the outside. The passive confluence structure makes the fume hood have poor anti-interference ability when converging airflow at the operation port. It is easily affected by factors such as the movement of laboratory staff and air conditioning supply, which reduces the overall sewage exhaust effect of the fume hood. In order to ensure the exhaust efficiency of pollutants in the fume hood, a larger exhaust volume is usually required, resulting in greater energy consumption. Summary of the invention

[0004] In response to the problems in the prior art, the present invention provides an energy-saving air-supplementing fume hood. The fume hood can not only improve the anti-interference ability of the fume hood when the airflow converges at the operating port through the upper inner air-supplementing jet and the upper outer air-supplementing jet that cooperate with each other, but also improve the airflow organization behind the sliding door, so that the fume hood can ensure the overall sewage discharge effect of the fume hood when the exhaust volume is smaller than that of the traditional fume hood, thereby reducing the air supply load and energy consumption of the laboratory air conditioning.

[0005] In order to achieve the above technical objectives, the technical solution of the present invention is:

[0006] An energy-saving air-making fume hood comprises an upper cabinet body, a lower cabinet body and an upper air-making system, the top of the upper cabinet body is provided with an air collecting hood connected to the exhaust fan through an exhaust duct, the operation port of the upper cabinet body is provided with a perspective sliding door that can move in a vertical direction, and the inner and rear sides of the upper cabinet body are provided with a guide baffle, the upper air-making system comprises an upper air-making fan, an upper air-making duct, an upper external air-making plenum box and an upper internal air-making plenum box, the upper external air-making plenum box and the upper internal air-making plenum box are both arranged on the top of the fume hood and are respectively located at the front and rear sides of the sliding door, the upper external air-making plenum box and the upper internal air-making plenum box are closed cavities with upper external air-making inlets and upper internal air-making inlets respectively opened at the bottom, and the inner cavities of the upper external air-making plenum box and the upper internal air-making plenum box are respectively communicated with the upper air-making fan through the upper air-making duct. The present invention has a simple structure. Through the upper inner air supply jet and the upper outer air supply jet that cooperate with each other, the present invention can not only improve the anti-interference ability of the fume hood when the airflow converges at the operation port, but also improve the airflow organization behind the sliding door, so that the fume hood can ensure the overall sewage discharge effect of the fume hood when the exhaust volume is relatively small, thereby reducing the air supply load and energy consumption of the laboratory air conditioning.

[0007] As a preferred embodiment, the fume hood further comprises a lower air supply and side air supply system, the lower air supply and side air supply system comprises a lower air supply fan, an air supply duct, a triangular air supply box and a side air supply box, the inner cavity of the triangular air supply box is connected to the lower air supply fan through the air supply duct, a lower air supply port is provided on the side wall of the triangular air supply box, the lower air supply port is located at the rear side of the sliding door, two side air supply boxes are provided, the two side air supply boxes are respectively located on the left and right sides of the fume hood, the inner cavity of each side air supply box is connected to the lower air supply fan through the air supply duct, and holes are evenly opened on the wall surface of each side air supply box. By setting up the lower air supply and side air supply system, the existence of the lower air supply airflow can effectively avoid the vortex and backflow generated by the separation of the gas boundary layer at the bottom edge of the operation port, and optimize the airflow organization at the entrance of the operation port. The existence of air supply airflow on both sides can optimize the airflow organization on both sides of the cabinet, improve the exhaust efficiency of gaseous pollutants in the corners of the cabinet, thereby improving the overall pollution control ability of the fume hood, so that the fume hood can ensure the exhaust efficiency of gaseous pollutants in the cabinet when the exhaust volume is relatively small, with low energy consumption.

[0008] As a further preferred solution, the fume hood further comprises a guide flap, which is arranged at the bottom edge of the operation port, and a guide channel is formed between the guide flap and the triangular air supply box for external air to enter the cabinet body on the rear side of the sliding door. By providing the guide flap and the guide channel, eddy currents and backflows caused by separation of the gas boundary layer at the bottom edge of the operation port can be effectively avoided, and the airflow organization at the entrance of the operation port can be further optimized, thereby further reducing energy consumption.

[0009] As a further preferred solution, the guide flap can rotate around a rotating shaft arranged at the front side of the sliding door. Such an arrangement can facilitate the cleaning of the guide flap.

[0010] As a preferred embodiment, the guide baffle is composed of an inclined guide plate and a vertical guide plate. The top of the inclined guide plate is connected to the top of the upper cabinet, and the connection is located between the air collecting hood and the upper internal air supply port. The bottom end of the inclined guide plate is connected to the vertical guide plate. The vertical guide plate is vertically arranged and has a spacing from the rear wall of the upper cabinet, and holes are evenly opened on the vertical guide plate.

[0011] As a preferred solution, a drainage hole connected to a sewer pipe is provided on the operating table in the upper cabinet.

[0012] As a preferred solution, the operating table in the upper cabinet adopts a ceramic table top, which can prevent chemical reagents from corroding the operating table top.

[0013] As a preferred solution, the fume hood further comprises a sliding door stopper, which is used to limit the opening height of the sliding door. By setting the sliding door stopper, the maximum opening height of the sliding door when the fume hood is working can be made not more than 0.5m.

[0014] As a preferred solution, an independent storage cabinet is provided in the lower cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A partial enlarged view of

[0017] Figure 3 is a front view of the present invention;

[0018] Figure 4 is a side sectional view of the present invention;

[0019] Figure 5 yes Figure 4 A partial enlarged view of

[0020] Figure 6 yes Figure 4 A partial enlarged view of

[0021] Figure 7 It is a schematic diagram of the structure in which the guide flap rotates around the rotation axis to another position;

[0022] Figure 8 It is a partial schematic diagram of the upper air supply system;

[0023] Fig. 9 It is a schematic diagram of the airflow direction of the present invention;

[0024] Reference numerals:

[0025] 100. Upper cabinet 110. Air collecting hood 120. Sliding door 130. Synchronous wheel 140. Belt 150. Guide baffle 151. Inclined guide plate 152. Vertical guide plate 160. Operation table 210. Upper air supply fan 220. Upper external air supply static pressure box 221. Upper external air supply port 230. Upper internal air supply static pressure box 231. Upper internal air supply port 310. Lower air supply fan 320. Triangular air supply box 321. Lower air supply port 330. Side air supply box 400. Guide flap 500. Guide channel 600. Rotating shaft 700. Lower cabinet 710. Locker 720. Shelf board 800. Sliding door stopper DETAILED DESCRIPTION

[0026] Combination Figures 1 to 9 , describes in detail a specific embodiment of the present invention, but does not limit the claims of the present invention.

[0027] like Figures 1 to 9 As shown, an energy-saving air supply fume hood includes an upper cabinet 100, an upper air supply system, a lower air supply system and a side air supply system, a guide flap 400 and a lower cabinet 700;

[0028] The top of the upper cabinet 100 is provided with an air collecting hood 110 connected to the exhaust fan through an exhaust pipe; the operation port of the upper cabinet 100 is provided with a perspective sliding door 120 that can move in the vertical direction, wherein the perspective sliding door 120 is connected to a counterweight with a weight equivalent to that of a belt 140 that passes around a synchronous wheel 130, so that the sliding door 120 can stay at any position; the operating table 160 in the upper cabinet 100 is provided with a drainage hole connected to the sewer pipe, wherein, in order to prevent the corrosion of the operating table surface by chemical reagents, the upper cabinet 100 is provided with a drainage hole connected to the sewer pipe, wherein, the drainage hole in the upper cabinet 100 is connected to the operating table surface by a belt 140 that passes around a synchronous wheel 130, and the drainage hole in the upper cabinet 100 is connected to the operating table surface by a belt 140 that passes around a synchronous wheel 130, and the drainage hole in the upper cabinet 100 is connected to the operating table surface by a belt 140 that passes through ... The operating table 160 adopts a ceramic tabletop; a guide baffle 150 is provided on the inner rear side of the upper cabinet 100, and the guide baffle 150 is composed of an inclined guide plate 151 and a vertical guide plate 152. The top of the inclined guide plate 151 is connected to the top of the upper cabinet 100, and the connection is located between the air collecting hood 110 and the upper inner air supply port. The bottom of the inclined guide plate 151 is connected to the vertical guide plate 152. The vertical guide plate 152 is vertically arranged and has a spacing with the rear wall of the upper cabinet 100. The vertical guide plate 152 has uniform holes.

[0029] The upper air supply system includes an upper air supply fan 210, an upper air supply duct, an upper external air supply static pressure box 220 and an upper internal air supply static pressure box 230. The upper external air supply static pressure box 220 and the upper internal air supply static pressure box 230 are both arranged on the top of the fume hood and are respectively located at the front and rear sides of the sliding door 120. The upper external air supply static pressure box 220 and the upper internal air supply static pressure box 230 are closed cavities with upper external air supply ports 221 and upper internal air supply ports 231 respectively opened at the bottom. The inner cavities of the upper external air supply static pressure box 220 and the upper internal air supply static pressure box 230 are respectively connected to the upper air supply fan 210 through the upper air supply duct;

[0030] The lower air supply and side air supply system comprises a lower air supply fan 310, an air supply duct, a triangular air supply box 320 and a side air supply box 330. The inner cavity of the triangular air supply box 320 is connected to the lower air supply fan 310 through the air supply duct. A lower air supply port 321 is provided on the side wall of the triangular air supply box 320. The lower air supply port 321 is located at the rear side of the sliding door 120. Two side air supply boxes 330 are provided. The two side air supply boxes 330 are respectively located on the left and right sides of the fume hood. The inner cavity of each side air supply box 330 is connected to the lower air supply fan 310 through the air supply duct. Holes are evenly opened on the wall of each side air supply box 330.

[0031] The guide flap 400 is arranged at the bottom edge of the operation port, and a guide channel 500 is formed between the guide flap 400 and the triangular air supply box 320 for external air to enter the cabinet 100 on the rear side of the sliding door 120. In order to facilitate the cleaning of the guide flap 400, the guide flap 400 is arranged to be rotatable around a rotating shaft 600 arranged on the front side of the sliding door 120.

[0032] An independent storage cabinet 710 is disposed in the lower cabinet body 700 , and the storage cabinet 710 is divided into two layers by a shelf board 720 .

[0033] Among them, in order to facilitate the safety of operators and the efficient operation of the fume hood, the fume hood is also provided with a sliding door limiter 800 for limiting the opening height of the sliding door 120. By setting the sliding door limiter 800, the maximum opening height of the sliding door 120 when the fume hood is working can be made not to exceed 0.5m.

[0034] In summary, the present invention has the following advantages:

[0035] 1. The present invention can improve the anti-interference ability of the fume hood when the airflow converges at the operating port by setting an upper air supply system, and can also improve the airflow organization behind the sliding door 120, wherein the upper outer air supply port 221 is close to the movable sliding door 120, and the attached jet air curtain formed by the upper outer air supply can form positive pressure protection for the breathing zone of the operator in front of the cabinet, thereby preventing gaseous harmful substances from escaping to the human breathing zone and causing harm to the operators. At the same time, it can also improve the anti-interference ability of the fume hood when the airflow converges, and the jet air curtain formed by the upper inner air supply can inhibit the formation of vortex behind the fume hood's transparent sliding door 120, thereby preventing toxic and harmful gases generated on the operating table in the cabinet from being retained behind the sliding door 120, and reducing the risk of leakage of toxic and harmful substances caused by the up and down movement of the sliding door 120, so that the fume hood can ensure the overall sewage discharge effect of the fume hood when the exhaust volume is relatively small, thereby reducing the air supply load and energy consumption of the laboratory air conditioner.

[0036] 2. The present invention sets up a lower air supply system and a side air supply system. The existence of the lower air supply airflow can effectively avoid the vortex and backflow of the air flow at the bottom edge of the operating port due to the separation of the gas boundary layer, and optimize the airflow organization at the entrance of the operating port. The existence of the air supply airflow on both sides can optimize the airflow organization on both sides of the cabinet, and improve the discharge efficiency of gaseous pollutants in the corners of the cabinet, thereby improving the overall pollution control ability of the fume hood, so that the fume hood can ensure the discharge efficiency of gaseous pollutants in the cabinet when the exhaust volume is relatively small, and the energy consumption is low.

[0037] 3. The air supply jets of the upper air supply system, the lower air supply system and the side air supply system in the present invention cooperate with the exhaust fan to ensure that the airflow in front of the guide baffle 150 flows from top to bottom and from outside to inside, so that the airflow entering the fume hood can be promptly and preferentially discharged through the guide baffle 150 and the exhaust fan in sequence after passing through the contaminated area of ​​the operating table. On the one hand, it can avoid the accumulation of gaseous pollutants in other places in the cabinet, reduce the possibility of gaseous pollutants in the cabinet escaping to the outside, and ensure the safe use of the exhaust hood operator. On the other hand, it can improve the carrying effect of the airflow on gaseous pollutants and enhance the removal effect of the exhaust hood on gaseous pollutants, so that the fume hood can ensure the removal efficiency of gaseous pollutants in the cabinet when the exhaust volume is relatively small, further reducing energy consumption.

[0038] 4. The present invention can effectively avoid eddies and backflows caused by separation of the gas boundary layer at the bottom edge of the operating port by providing the guide flap 400 and the guide port, further optimize the airflow organization at the inlet of the operating port, and thus further reduce energy consumption.

[0039] 5. The present invention can facilitate the cleaning of the guide flap 400 by configuring the guide flap 400 to be rotatable around an axis.

[0040] 6. The present invention provides a sliding door stopper 800 so that the maximum opening height of the sliding door 120 when the fume hood is working does not exceed 0.5m.

[0041] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. An energy-saving air supply fume hood, comprising an upper cabinet and a lower cabinet, wherein the top of the upper cabinet is provided with an air collecting hood connected to an exhaust fan through an exhaust pipe, the operation port of the upper cabinet is provided with a perspective sliding door movable in a vertical direction, and a guide baffle is provided inside the rear side of the upper cabinet, characterized in that: It also includes an upper air supply system, which includes an upper air supply fan, an upper air supply duct, an upper external air supply static pressure box and an upper internal air supply static pressure box. The upper external air supply static pressure box and the upper internal air supply static pressure box are both arranged on the top of the fume hood and are respectively located on the front and rear sides of the sliding door. The upper external air supply static pressure box and the upper internal air supply static pressure box are closed cavities with upper external air supply ports and upper internal air supply ports respectively opened at the bottom. The inner cavities of the upper external air supply static pressure box and the upper internal air supply static pressure box are respectively connected to the upper air supply fan through the upper air supply duct; the fume hood also includes a lower air supply and a side air supply system. The lower air supply and side air supply systems include a lower air supply fan, an air supply duct, a triangular air supply box and a side air supply box. The inner cavity of the triangular air supply box is connected to the lower air supply fan through the air supply duct. A lower air supply port is provided on the side wall of the triangular air supply box. The lower air supply port is located on the rear side of the sliding door. Two side air supply boxes are provided. The two side air supply boxes are respectively located on the left and right sides of the fume hood. The inner cavity of each side air supply box is connected to the lower air supply fan through the air supply duct. Holes are evenly opened on the wall of each side air supply box. The fume hood also includes a guide flap, which is provided on the operating At the bottom edge of the opening, a guide channel is formed between the guide flap and the triangular air supply box for external air to enter the upper cabinet body behind the sliding door. The guide flap can rotate around a rotating shaft arranged on the front side of the sliding door; the guide baffle is composed of an inclined guide plate and a vertical guide plate. The top of the inclined guide plate is connected to the top of the upper cabinet body, and the connection point is located between the air collecting hood and the upper internal air supply port. The bottom end of the inclined guide plate is connected to the vertical guide plate. The vertical guide plate is vertically arranged and has a spacing from the rear wall of the upper cabinet body, and holes are evenly opened on the vertical guide plate.

2. The fume hood according to claim 1, characterized in that A drainage hole connected to the sewer pipe is arranged on the operating table in the upper cabinet.

3. The fume hood according to claim 1, characterized in that: The operating table in the upper cabinet adopts a ceramic table top.

4. The fume hood according to claim 1, characterized in that The fume hood also includes a sliding door limiter, which is used to limit the opening height of the sliding door.

5. The fume hood according to claim 1, characterized in that: An independent storage cabinet is arranged in the lower cabinet.

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