JP4532087B2 - Fume hood - Google Patents

Description

  In the present invention, even if the internal air becomes a positive pressure atmosphere due to the high amount of heat generated by the heat source installed in the processing chamber of the hood main body, it can be safely enclosed without leaking into an indoor space such as a laboratory. This technology is related to fume hoods that can be discharged.

  The fume hood is a device that is necessary for safely conducting various chemical experiments in laboratories in laboratories, etc., and the hood body that constitutes this is used to open and close the front opening of the processing chamber Elevating sash windows are provided, and by drawing air so that the inside of the processing chamber has a negative pressure atmosphere, internal air containing toxic gas and the like generated during the experiment is installed outdoors such as an exhaust gas cleaning device. It can be smoothly led out to the purification processing means side.

FIG. 4 is an explanatory diagram showing an example of a conventional quantitative exhaust type fume hood as a schematic diagram. In this case, the hood main body 1 is lifted and lowered in the front opening 3 of the processing chamber 2 so as to be raised and lowered. in relation to the opening of the sash window 4, by controlling the face velocity of the conditioned air flow a ₁ flows into the processing chamber 2, for example, regardless of the vertical position of the sash window as described in Patent Document 1 It is formed with a structure capable of quantitative exhaust.
Japanese Utility Model Publication No. 3-9792

FIG. 5 is an explanatory view showing an example of a conventional air curtain type fume hood as a schematic diagram. In this case, the hood main body 1 is disposed in the front opening 3 of the processing chamber 2 so as to be movable up and down. In addition to controlling the surface speed of the air-conditioned air flow A ₁ flowing into the processing chamber 2 in relation to the opening degree of the elevating sash window 4, it is also possible to use the air outlet 5 provided above the front opening 3. The air curtain A ₂ can be formed along the front side of the elevating sash window 3 by blowing the outside air introduced from the outdoors downward, as described in Patent Document 2, for example. Further, it is formed with a structure capable of suppressing the consumption of conditioned air in the laboratory.
JP-A-1-266857

Further, FIG. 6 is an explanatory view showing a modified example of the air curtain type fume hood shown in FIG. 5 as a schematic diagram. In this case, the hood main body 1 is arranged to be raised and lowered in the front opening 3 of the processing chamber 2. In addition to being able to control the surface speed of the air-conditioned air flow A ₁ flowing into the processing chamber 2 in relation to the opening degree of the elevating sash window 4 provided, the fumarole provided above the inner side of the front opening 3 blowing outside air introduced from outdoors from 6 downward, by drawing into the lower process chamber 2, and to be able to form an air curtain a ₃ and along a rear side of the lifting sash windows 4, This makes it possible to perform experiments more safely by blocking researchers from toxic gases and odorous gases generated in the processing chamber 2.

  However, in the case of the conventional fume hood shown in FIGS. 4 to 6, if a high amount of heat is generated from a heat source such as a gas burner in the processing chamber 2, the internal air thermally expands or generates an updraft. As a result of the positive pressure atmosphere, the flow of conditioned air (bypass air) at a predetermined flow rate that should flow from the front opening 3 or a gallery (not shown) located above the front opening 3 is suppressed. There was a risk of leaking internal air containing toxic gas and odorous gas to the laboratory side which is an indoor space.

  In view of the above-described problems of the prior art, the present invention may cause the internal air containing a toxic gas or the like to thermally expand or generate an updraft due to the high amount of heat generated by a heat source installed in the processing chamber of the hood body. However, it is an object to provide a fume hood that can be safely discharged without being leaked into an indoor space such as a laboratory.

The present invention has been made to achieve the above object, and a hood body in which the opening area of the front opening of the processing chamber is freely expanded and contracted in relation to the opening of the lifting sash window, and the lifting sash window. An air supply that is provided on the ceiling side of the hood main body located above the hood body, takes in conditioned air in an indoor space such as a laboratory, and forcibly blows it downward along the lift sash window as sealing air A chamber, and prevents leakage of the internal air in the processing chamber to the indoor space side by the sealing force generated by the sealing air when a positive pressure atmosphere is generated by a high amount of heat from the heat source. In the fume hood that can be freely exhausted to the outside, the air supply chamber includes a compartment having a communication portion with the indoor space, one or more blowers installed in the compartment, and an air volume of these blowers. Controller to control And an air supply guide plate that guides the sealing air downward between the front surface of the elevating sash window and the sealing air between the rear surface and the lower surface. A guide plate is provided to guide the air to the front opening portion of the processing chamber along both the front surface and the rear surface of the lifting sash window. This is the main feature.

In this case, the pre-Symbol blower can be freely controlled air volume by the controller based on the output signal from the sensor for detecting is disposed in a treatment chamber temperature and / or pressure.

According to a fume hood according to the present invention, forcibly provided air supply chamber for blowing air downward on the ceiling side of the hood main body as a sealing air takes in air-conditioning air in the indoor space, such as a laboratory, the lifting sash The processing without increasing the total exhaust air volume by the sealing air that is always forcibly supplied under optimum conditions along the both front and back surfaces of the window to the front opening side of the processing chamber. Leakage of the internal air to the indoor space can be prevented when the indoor air becomes a positive pressure atmosphere due to the high heat quantity from the heat generation source. Therefore, since toxic gases and odorous gases generated in the processing chamber can be surely prevented from leaking into the indoor space and exhausted to the outside, researchers and others can achieve energy saving effects. There is an advantage that the experiment can be performed more safely.

  FIG. 1 is an explanatory view schematically showing an example of a fume hood according to the present invention. The fume hood 11 has an opening area of the front opening 16 of the processing chamber 15 in relation to the opening of the elevating sash window 17. The hood main body 13 is formed so as to be freely expanded and contracted, and the whole is formed.

  That is, the fume hood 11 includes a pedestal 12 installed on the floor of an indoor space such as a laboratory, and a hood main body 13 installed integrally on the pedestal 12, and an elevating sash with a handle 18. Air-conditioned air is introduced into the processing chamber 15 from the front opening 16 and the like under a predetermined surface speed determined by the relationship with the opening of the window 17, and the exhaust port 21 is passed through the baffle plate 19 and the ventilation portion 20. Can be smoothly led out to a purification processing means side such as an exhaust gas cleaning device installed outdoors. Note that reference numeral 22 in the drawing denotes an illumination box composed of a fluorescent lamp 23 and the like disposed to illuminate the inside of the processing chamber 15.

  In addition, air-conditioned air in the indoor space is taken into the ceiling portion 14 side of the hood body 13 located above the lift sash window 17 and is forced along the lift sash window 17 as the sealing air 45 shown in FIG. An air supply chamber 33 for blowing air downward is provided. For this reason, when the internal air in the processing chamber 15 becomes a positive pressure atmosphere by thermal expansion due to a high heat amount from a heat source such as a burner or an electric heater, or by generating an upward airflow, Even if the flow of conditioned air (bypass air) at a predetermined flow velocity that should flow from a gallery (not shown) is blocked and internal air containing toxic gas, odorous gas, etc. tries to leak back to the indoor space side, the sealing air 45 Is sealed in the processing chamber 15, and can be smoothly discharged to the outside through the exhaust port 21.

  In this case, the air supply chamber 33 includes a top plate portion 35 disposed along the length direction of the front edge portion of the ceiling portion 14, and the left and right sides of the top plate portion 35 as shown in FIG. One or more compartments 34 that are partitioned by partition walls 37 that cover both side surfaces and the rear surface side, and that are arranged along the length direction of the top plate 35 and that have communication portions 36 with the indoor space. In the illustrated example, a total of four blowers 38 and a controller 39 for controlling the air volume of these blowers 38 are provided.

In addition, as shown in FIG. 3, the air supply chamber 33 includes an upper inclined plate portion 42 disposed in a positional relationship facing the front side of the compartment 34, and the upper inclined plate portion 42. An air supply guide plate 41 including a lower vertical plate portion 43 reaching the front surface 17a side of the elevating sash window 17 is disposed. A guide plate 44 is provided on the back surface 17 b side of the lift sash window 17 that is in a positional relationship facing the lower vertical plate portion 43 to secure a space between the lift sash window 17.

  In addition, each blower 38 can freely control the air volume by the controller 39 based on an output signal from a detection sensor (not shown) that detects the temperature and / or pressure disposed in the processing chamber 15.

  Next, the operation of the present invention will be described. Since the air supply chamber 33 is disposed on the ceiling portion 14 side of the hood main body 13 located above the elevating sash window 17, the gas in the processing chamber 15 is provided. A high heat quantity is generated from a heat source such as a burner, and the internal air thermally expands or generates a rising air flow to form a positive pressure atmosphere, and a predetermined flow velocity that should flow from a gallery (not shown) located above the front opening 15 Inflow of conditioned air (bypass air) is suppressed, and on the contrary, there is no possibility of leaking internal air containing toxic gas and malodorous gas in the processing chamber 15 from the above portions to the laboratory side which is an indoor space. be able to.

That is, the air supply chamber 33, so can be forcibly blowing air downward as a sealing air 45 takes in air-conditioning air in the indoor space, such as a laboratory, the sealing air 45, the upper-side inclined plate Guided by an air supply guide plate 41 including a portion 42 and a lower vertical plate portion 43, the air is blown down along the front surface 17 a of the elevating sash window 17. Further, the sealing air 45 is blown down along the back surface 17b of the elevating sash window 17 as shown in FIG. As a result, toxic gas and odorous gas generated in the processing chamber 15 without increasing the overall exhaust air volume while allowing inflow of conditioned air from the front opening 16 or the like at a predetermined surface speed. As a result, it is possible to reliably prevent leakage to the indoor space side and exhaust it to the outside, so that researchers and the like can perform experiments more safely.

  Moreover, the conditioned air supplied to the indoor space side is always relatively slow, for example, at a low wind speed of 0.5 m / sec or less, even under such a positive pressure atmosphere, from the front opening 16. Since it can be introduced into the processing chamber 15, it can function effectively as an aid to achieve the energy saving effect.

Furthermore, each air blower 38 constituting the air supply chamber 33 includes a controller 39 that can control the air flow rate according to the change in the amount of heat in the processing chamber 15 and the capacity of the internal space. it can be forcibly supplied to the front opening 16 side of the processing chamber 15 along a side of the front 17a and rear 17 b of the lifting sash window 17 sealing air 45 optima.

  Furthermore, if one or both of the temperature sensor and the pressure sensor is installed as a detection sensor (not shown) at an appropriate position in the processing chamber 15, the controller is controlled more appropriately based on the output signal detected by the sensor. Thus, the amount of air blown from each blower 38 can be made more preferable.

Explanatory drawing which shows an example of this invention typically. The principal part perspective view which shows the detail of the air supply chamber in this invention. Explanatory drawing which expands and shows the surrounding part in the dashed-dotted line in FIG. Explanatory drawing which shows an example of the conventional quantitative exhaust type fume hood. Explanatory drawing which shows an example of the conventional air curtain type fume hood. Explanatory drawing which shows the example of improvement of the air curtain type fume hood shown in FIG.

DESCRIPTION OF SYMBOLS 11 Fume hood 12 Base 13 Hood main body 14 Ceiling part 15 Processing chamber 16 Front opening part 17 Lifting sash window 17a Front surface 17b Rear face 18 Handle 19 Baffle plate 20 Ventilation part 21 Exhaust port 22 Illumination box 23 Fluorescent lamp 33 Supply chamber 34 Compartment 35 Top plate portion 36 Communication portion 37 Side wall portion 38 Blower 39 Controller 41 Air supply guide plate 42 Upper inclined plate portion 43 Lower vertical plate portion 44 Guide plate
45 sealing air

Claims (2)

A hood body for the scaling of the opening area of the front opening of the processing chamber in relation to the opening of the lifting sash windows were freely formed, the experiment provided on the ceiling side of the hood body located above the lifting sash window uptake conditioned air indoor space such as a chamber, and a supply chamber for blowing air into forced downward along the lifting sash window as the sealing air, and positive pressure atmosphere by high heat amount from the heating source In the fume hood which prevents the leakage to the indoor space side by the sealing force generated by the sealing air and the internal air in the processing chamber when it becomes
The air supply chamber is formed by including at least a compartment having a communication portion with the indoor space side, one or more blowers installed in the compartment, and a controller for controlling the air volume of the blowers. ,
An air supply guide plate that guides the sealing air downward is provided between the front surface of the lift sash window, and a guide plate that guides the sealing air downward is provided between the back surface and the back of the lift sash window. A fume hood capable of always forcibly supplying sealing air under optimum conditions along the front and rear surfaces of a window to the front opening side of the processing chamber . The fume hood according to claim 1, wherein the blower freely controls the air volume by the controller based on an output signal from a detection sensor that detects a temperature and / or pressure disposed in the processing chamber .

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