Patent Grant
10478873
This application is a U.S. National Stage of International Patent Application No. PCT/CN2016/071209, filed 18 Jan. 2016, which claims the benefit of Chinese Patent Application No. 201520216778.6, filed 10 Apr. 2015, both herein fully incorporated by reference.
The present invention relates to a fume hood, especially relates to an air supply type fume hood.
Fume hood can be generally described as a ventilated working space for catching, accommodating and discharging exhaust air, hazardous gas and particulate matter. Most of the traditional fume hoods are used to send a large amount of environmental air from the front opening of the fume hood into the work chamber of the fume hood while using a blower of large power to exhaust air in the work chamber to accommodate and process hazardous substances in the air. Under the design concept of the traditional fume hoods, the higher the air volume sent in from the front opening, the more effective the controlling and discharging function of the fume hood to the hazardous substances in the air is, thus, it is required to supply a large amount of air to the space of the fume hood through the ventilation air conditioning system of the building, such as the laboratory, to replace the environmental air sent into the fume hood from the front opening. Due to that the air supplied into the laboratory belongs to a part of the environmental air supplied for the laboratory, it must be processed into the same environmental air degree so as to ensure a comfortable and secure working environment of the laboratory, therefore, the use of the traditional fume hoods usually causes a great energy consumption of the buildings where laboratories and others are. Besides, unpredictable and inconsistent air flowing modes, such as the vortex type air group near the air outlet and the front opening will often happen. Under this situation, whatever the air velocity sent into from the front opening is, it will cause the risk of air leakage in the work chamber if the air system in the work chamber has turbulence or vortex, and it will threaten the health and safety of the experimenters. Therefore, new fume hood design structure and operation technology is highly required to cut down the energy consumption and reduce the leakage risk of hazardous substances in the work chamber.
At present, new type energy-saving and environment protective fume hoods in the fume hood market are all air supply type fume hoods. By disposing an air supply outlet on the upper or lower side of the work chamber and obtaining supplement air from the air supply power system of the building to blow into the work chamber of the fume hood, above design saves the air conditioning energy consumption of the building caused by air supplied in a certain degree. However, the single supplement air flow of current new type fume hoods cannot establish a stable air flow mode in the work chamber of the fume hood, so the problem of air turbulence and vortex is still unsolved, the leakage risk hazardous to the health and safety of the experimenters still exists. Besides, current fume hoods in the market all rely on the unified air supply system and air exhaust system of the building to obtain power, if a plurality of fume hoods are used at the same time, the amount of air supplied cannot realize individual adjustment depending on the required use condition, thus it will cause the result of a higher energy consumption. Moreover, during the installation and debugging process, the fume hood and its control system often use components in bulk to be temporarily assembled on site, therefore, it has the problem of high installation cost and poor consistency of product quality.
The present invention provides a fume hood, which can reduce air conditioning energy consumption and prevent leakage of hazardous substances by containing them within the work chamber, with a low installation cost and a high consistency of product quality. To achieve the foregoing, the fume hood of the present invention, comprising: a hood, of which an inner cavity forms a work chamber, and a front wall is formed with an opening opened toward the indoor environment; an air supply system, which is connected with an air supply channel of the building to supply air to the work chamber; an air exhaust system, which is connected with an air exhaust channel of the building to discharge air that enters the work chamber through a front opening and enters the work chamber through the air supply system, out from the work chamber; the air supply system is provided with at least one air supply outlet in an upper part and a lower part of the hood respectively, said air supply outlet supplies air toward the work chamber; the hood is provided with a top module in the upper portion; said top module is mounted therein with an air supply blower and an air supply valve for the air supply system, and an air exhaust blower and an air exhaust valve for the air exhaust system; the air supply channels which connect the air supply blower and the air supply valve to each air supply outlet are communicated with each other.
Applying that structure, due to that the upper part and the lower part of the hood comprises at least one air supply outlet respectively, not only can the air amount sent from the front opening be reduced so as to reduce air conditioning energy consumption, but also the risk of air overflow in the work chamber is greatly reduced for that the plurality of air supply outlets are disposed to establish a stable push-pull type airflow mode. Besides, due to that the fume hood itself has an air exhaust blower, an air exhaust valve, an air supply blower and an air supply valve, it can flexibly design the air exhaust and supplement amount according to actual conditions, i.e., the distance to the overall power blower of the building, whether the operator is in the disposed region, to further benefit the energy consumption. And as above blowers and valves are integrated on the top module of the fume hood, there is no need to have on-site assembling or secondary design to the ventilation system of the building, thereby reduction of installation cost can be realized. Further, due to the highly integrated modularity design, the consistency of product quality can be ensured.
Preferably, the left and right side walls of the hood are hollow double-laminar structures, the air supply channel located on the upper portion of the hood and the air supply channel located on the lower portion of the hood are communicated through the hollow portion of the left and right side walls.
Applying that structure, the air supply channels of the upper and lower portions of the hood are communicated to each other through the hollow portion of the side wall, therefore, there is no need to dispose another connection pipe, it saves the space and simplifies the procedures when the user is installing the fume hood for the first time.
In addition, preferably, the air exhaust system is on the upper portion of the hood and an air exhaust region is provided close to the position of the rear wall of the hood; the air exhaust region extends in a whole left and right width direction of the hood, and is connected with the air exhaust blower and the air exhaust valve.
Applying that structure, the air exhaust system is disposed on the upper portion of the hood and close to the position of the rear wall of the hood, therefore, it is benefit for forming the said push-pull type airflow mode. In addition, due to that the air exhaust region extends in the whole left and right width direction of the hood, it can avoid the formation of air vortex near the top air exhaust outlet of the work chamber and provide possibility to the intercommunication of the whole air exhaust system including the following bottom air exhaust channel.
In addition, preferably, each said air supply outlet extends along a left and right width direction of the work chamber, respectively, the plurality of air supply outlets comprise therein: a first air supply outlet located above the front opening; a second air supply outlet located below the front opening; and a third air supply outlet located on the upper portion of the hood and on an outer side of the front wall, the third air supply outlet supplies air toward the work chamber and toward the lower side of the hood.
Applying that structure, it is benefit for forming above said push-pull type airflow mode. And due to that the air supply outlet along the left and right width direction of the work chamber, it can send out air uniformly and avoid the formation of turbulence. In addition, due to that the third air supply outlet blows wind downward, the downwardly blown wind is just in the breathing position of the operator, therefore, it will further reduce the risk of inhaling hazardous substances of the operator, and the downwardly blown wind forms an “air barrier”, which can have the function of buffering the environmental air in the work chamber and outside the hood, thus it can effectively prevent the risk of overflow.
In addition, preferably, there is an inclined top wall that extends backwards and upwards from the first air supply outlet toward the air exhaust region in the work chamber.
Applying that structure, it can prevent the formation of vortex on the top portion of the work chamber and the air in the work chamber can climb slowly and uniformly from above first air supply outlet to above air exhaust region along the inclined top wall.
In addition, preferably, the work chamber is provided with an air baffle therein, the air baffle is vertically disposed close to the rear wall and the upper end portion extends toward the air exhaust region, a plurality of through holes are provided on the lower portion of the air baffle, the plurality of through holes are arranged in the whole left and right width direction of the air baffle.
Applying that structure, it is benefit for guiding the air in the work chamber to above air exhaust region so as to avoid the formation of air vortex, and due to that the through holes on the air baffle are arranged in the whole left and right width direction of the air baffle, it is benefit for providing basically consistent continues wind discharging to the whole width face of the work chamber.
In addition, preferably, at least one hood base is provided on the lower part of the hood; the inner cavity of the hood base is communicated with the air exhaust region through an air exhaust channel of the hood base; the air exhaust channel of the hood base is disposed in the hollow part of at least one side wall of the left and right side walls and extends along an up and down direction closing to the rear wall.
Applying that structure, hazardous air in the hood base caused by storing volatile reagent or toxic materials can be discharged to outside. And due to that the air exhaust channel of the hood base is disposed in the hollow part of the side wall, therefore, it saves the space and simplifies the procedures when the user is installing the fume hood for the first time.
In addition, preferably, each said air supply outlet is provided with at least one air baffle, respectively.
Applying that structure, it can minimize the turbulence and ensure the supplement airflow to blow out uniformly and slowly along the set direction.
Applying that structure, it can effectively reduce the material wastage of the air supply outlet and further help the bottom supplement air to become laminar flow that supplied into the work chamber, and it can also prevent sundries from coming into the air supply outlet.
In addition, preferably, the air supply blower and the air exhaust blower are power adjustable blowers, respectively, the air supply valve and the air exhaust valve are opening degree changeable blowers, respectively, the fume hood is also provided with: a sliding window, which can slide within the front opening and is for adjusting the open area of the front opening; a position sensor, which is provided in the top module and is for detecting the position of the sliding window; an air velocity transducer, which is disposed on the inner wall of the work chamber and close to the front opening, and is for detecting the velocity of the air entering into the work chamber from the front opening; an infrared detector, which is disposed on the front wall of the top module and is for detecting whether the operators are in the disposed region; and a control unit, which is located in the top module and is connected with the position sensor, the air velocity transducer, the infrared detector, the air supply blower and the air supply valve and the air exhaust blower and the air exhaust valve and adjusts the power of the air supply blower and the opening degree of the air supply valve and the power of the air exhaust blower and the opening degree of the air exhaust valve based on the detected information of the position sensor, the air velocity transducer and the infrared detector.
Applying that structure, the automatic control system could automatically adjust the power of the air supply blower and the opening degree of the air supply valve, and the power of the air exhaust blower and the opening degree of the air exhaust valve according to the actual using condition of the fume hood itself, which can reduce the air conditioning energy consumption. Also the structure is simple and convenient, which saves the space and greatly reduces the installation cost and maintenance cost of the fume hood.
Here the figures will be referred to introduce the preferable embodiment of the present invention in details. Although the description of the present invention will be introduced together with the preferable embodiment, it does not represent that the features of the present invention are limited to the embodiment. On the contrary, the purpose of combining the embodiment to introduce the invention is to cover the choices or improvements based on the claims of the present invention or which may extend over it. In order to provide deep understanding of the present invention, the following description will contain many specific details. The present invention may not use to implement these details. Besides, in order not to confuse or bedim the key point of the present invention, some specific details will be omitted in the description.
Besides, “up”, “down”, “left”, “right”, “top” and “bottom” used in the following description are defined by the space position based on the fume hood used by the experimenters in the laboratory, while it should not be understood as the limitation to the present invention.
As shown in
The hood 100 is provided with a top module 400 peculiar in the upper portion thereof. The top module 400 is mounted therein with a power adjustable air supply blower 211, an opening degree adjustable air supply valve 212 located on the downstream side of the airflow direction of the air supply blower 211, a power adjustable air exhaust blower 311 and an opening degree adjustable air exhaust valve 312 located on the downstream side of the airflow direction of the air exhaust blower. Said air supply blower 211, air supply valve 212 and all the following mentioned air supply outlets, air supply channels constitute the air supply system, which is connected with the air supply channel of the building through the air supply overall outlet A4 to supply air to the work chamber 102. Said air exhaust blower 311, air exhaust valve 312 and all the following mentioned air exhaust region, air exhaust channels constitute the air exhaust system, which is connected with the air exhaust channel of the building through the air exhaust overall outlet B4 to discharge air that enters the work chamber 102 through the front opening 110 and enters the work chamber 102 through the air supply system, out from the work chamber 102.
A second air supply outlet A2 is disposed below the front opening 110, the second air supply outlet A2 is designed to be a ¼ cylindrical surface shape which extends along the left and right width direction of the work chamber 102, its ¼ cylindrical surface faces toward the work chamber 102, that is, facing toward the rear upper side. The second air supply outlet A2 is provided thereon with plurality of air baffles 222 (as shown in
A third air supply outlet A3 is disposed on the upper portion of the hood 110 and on the front side of the front wall 101, the third air supply outlet A3 is designed to be a ¼ cylindrical surface shape which extends along the left and right width direction of the work chamber 102, its ¼ cylindrical surface faces toward the work chamber 102, that is, facing toward the rear lower side. The third air supply outlet A3 is provided thereon with plurality of air baffles 223 (as shown in
As shown in
As shown in
As shown in
The arrow in
Further, the fume hood of the present embodiment can cooperate with the control system to be used as a variable air volume fume hood; the entering amount of the air at the front opening can be flexibly changed in a great range by means of the position change of the sliding window. Specifically, as shown in
The infrared detector 803 can perceive whether the experimenters are in the disposed working region. If it detects that no one is in the working region and the sliding window 804 of the fume hood is not in a close state, the control unit will send signal to the driving device (not shown in the figures) of the sliding window 804 to close the sliding window 804 so as to reduce the air amount entered into the work chamber from the indoor environment and reduce energy consumption of the laboratory. Besides, after the sliding window 804 is closed, the air entering amount of the fume hood is only provided by each air supply outlets A1-A3, the air exhaust amount of the fume hood will decrease at the same time, thus the system energy consumption of the fume hood will also decrease.
Furthermore, when the opening of the sliding window 804 changes, the control unit receives the new position coordinates of the sliding window sent by the position sensor 802, and calculates the new fume hood air exhaust amount required for maintaining the surface air velocity according to following formula:
Q=V*S*3600 (1)
Q is the air exhaust amount of the work chamber 102 of the fume hood, of which the unit is m3/h; V is the preset value of the surface air velocity, of which the unit is m/s; S is the area of the ventilation sectional area of the sliding window 804, that is, the area of the front opening 110, of which the unit is m2, wherein,
S=L*H (2)
L is the width of (when the sliding window 804 is moving up and down) or the height (when the sliding window 804 is moving left and right) of the sliding window 804, which is a fixed value; while H is the opening degree of the sliding window 804 detected by the said position sensor 802.
Then the control unit obtains the air exhaust amount of the work chamber 102 of the fume hood by calculation and combines the air exhaust amount value of the bottom air exhaust channels B1 and B2 to adjust the power of the air exhaust blower 311 and the opening degree of the air exhaust valve 312 so as to change the air exhaust amount value of the whole fume hood. And accordingly the power of the air supply blower 211 and the opening degree of air supply valve 212 are adjustable to change the air supply amount value of the air supply system.
When a plurality of fume hoods are parallelly connected in the ventilation system of the building, the air supply and exhausting amount of each fume hood subject to its particular using condition will be different. People skilled in the field well knows that, in the whole airflow system, the closer the distance to the overall power blower is, the more the supplied or discharged airflow amount will be; the farther the distance to the overall power blower is, due to pressure drop and wastage, the less the supplied or discharged airflow amount will be. Thus, without the control of the valve, each fume hood cannot realize individual adjustment subject to the particular using condition only by the overall power blower. In order to solve the above problem, most of the new environmental VAV fume hoods in the current market are mounted with venture valves of high cost. In the present embodiment, as said above, due to that the fume hood is integrated with the top module 400, while the top module 400 is mounted therein with the exhausting blower 311, the air exhaust valve 312, the air supply blower 211 and the air supply valve 212 of which the power and opening degree can be adjusted according to actual conditions, and the power and opening degree of above blowers and valves can be adjusted by the automatic control system, therefore, it can have the identical function as the venture valves; and it has a simpler structure and saves more space, while greatly reduce the installation cost and maintenance cost of the fume hood.
Above is the description to the preferable embodiment of the present invention, but the present invention is not limited to this, it can be measured by conducting various deformation not out of its proposed range.
For example, in the said embodiment, two air supply outlets are provided on the upper portion of the hood, one air supply outlet is provided on the lower portion of the hood, and one air exhaust region is provided on the upper portion of the hood and close to the position of the rear wall of the hood, but the disposed position and number of the air supply outlet and the air exhaust region is not limited to this, only if the push-pull type airflow mode can be formed in the work chamber.
Also, in the said embodiment, the air supply blower and the air exhaust blower are power adjustable blowers, respectively, the air supply valve and the air exhaust valve are opening degree changeable blowers, respectively, but the present invention is not limited to this, only if at least one of the blower and the value is disposed to be adjustable. Besides, without the requirement of adjusting the air amount, it only needs to dispose the fixed power of the blower and the fixed opening degree of the valve according to the distance of the fume hood to the system overall power blower.
Also, in the said embodiment, the air supply valve and the air exhaust valve are disposed on the downstream side of the airflow direction of the air supply blower and the air exhaust blower, but the present invention is not limited to this, the air supply valve and the air exhaust valve can be also disposed on the upstream side of the airflow direction of the air supply blower and the air exhaust blower.
Also, in the said embodiment, the sliding window is disposed to adjust the air amount entering from the front opening of the fume hood, but the present invention is not limited to this, without the requirement of adjusting the air entering amount, it can dispose no sliding window to reduce to cost.
Also, in the said embodiment, the hood is provided with two hood bases in the lower side for storing reagents and materials required by the experiment, but the present invention is not limited to this, the number of the hood base can be appropriately disposed according to requirements, or without disposing the hood base. Besides, the number and position of the bottom air exhaust channel can be just appropriately disposed corresponding to the number and position of the hood base.
Also, in the said embodiment, the air velocity transducer for detecting the surface air velocity is disposed on the inner surface of the side wall, but the present invention is not limited to this, the air velocity transducer can be also disposed on the inner wall of the work chamber, such as the bottom wall or the top wall, if not the surface air velocity can be detected without bothering the experimental operation.
Also, in the said embodiment, the fume hood is a fume hood for experiment, but except for this, the fume hood of the present invention can be applied to any works which need to control and discharge hazardous substances in air, such as wet etching cleaning system required in semiconductor industry and so on.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015 2 0216778 U | Apr 2015 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2016/071209 | 1/18/2016 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2016/161834 | 10/13/2016 | WO | A |
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| 4741257 | Wiggin | May 1988 | A |
| 5240455 | Sharp | Aug 1993 | A |
| 6302779 | Ryan | Oct 2001 | B1 |
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| 101274327 | Oct 2008 | CN |
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| International Search Report (including English translation) for related International Patent Application No. PCT/CN2016/071209, dated Apr. 12, 2016. |
| Written Opinion of the International Searching Authority for related International Patent Application No. PCT/CN2016/071209, dated Apr. 12, 2016. |
| Number | Date | Country | |
|---|---|---|---|
| 20170182527 A1 | Jun 2017 | US |
