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  Method and device for local ventilation by buiding airflow and separating airflowUSPTO Application #: 20060154590Title: Method and device for local ventilation by buiding airflow and separating airflow Abstract: This a method of discharging polluted air near combustion heating type cooking device (1) in a room having combustion heating type cooking device (1) to cause polluted air, comprising the steps of generating upward suction discharge stream (6) from upward position of the combustion heating type cooking device (1) to outdoor air, generating upward blow induction stream (21) from the position near the side of the combustion heating type cooking device (1) to the suction discharge stream (6), and by inductive action of this blow induction stream (21), taking up the polluted area near the surrounding of the combustion heating type cooking device (1) and forcibly collecting and delivering into the suction discharge stream (6). To present technology of discharge and local ventilation capable of decreasing ventilation capacity and air conditioning capacity substantially by lowering the air conditioning load by introduction of fresh air by intake, and decreasing the capacity of air conditioning and ventilation facilities by eliminating consumption of electrical energy. (end of abstract) Agent: Rader Fishman & Grauer PLLC - Washington, DC, US Inventor: Yoshiaki Kanaya USPTO Applicaton #: 20060154590 - Class: 454056000 (USPTO) Related Patent Categories: Ventilation, Workstation Ventilator (e.g., Hood, Offtake, Etc.), Covered Workbench Chamber (e.g., Fume Hood, Etc.) The Patent Description & Claims data below is from USPTO Patent Application 20060154590. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to discharge method, local ventilation method, discharger, local ventilator, and ventilation system, and more particularly to an effective technology of discharge and local ventilation for use in any indoor space requiring discharge and ventilation such as factory, kitchen, smoking room, and toilet, where sources of contaminants causing polluted air can be specified in a specific area in the room, and polluted air is not seriously harmful for human health such as hot air flow, steam, odor, cigarette smoke, oil fume or dusty air. BACKGROUND ART [0002] Generally in indoor space having sources of contaminants causing polluted air such as factory, kitchen, smoking room, and toilet, discharge or ventilation for cleaning the indoor atmosphere is needed. [0003] In this case, if the polluted air is not seriously harmful for human health such as hot air flow, steam, odor, cigarette smoke, oil fume or dusty air, local ventilation method for such indoor space is generally an overall ventilation method for exchanging the entire air of the room, in a diluted state of polluted air mixed in the indoor atmosphere. [0004] Overall ventilation method consists of three types, that is, a case of using mechanical power in both intake and discharge, a case of using mechanical power in intake and discharging naturally through suction opening, and a case of using mechanical power in discharge, and sucking naturally from intake opening, and the mainstream is the mechanical intake and discharge method. [0005] According to statutory regulations about ventilation in general buildings, ventilation rates are roughly determined for the purposes of assuring safety and sanitation of people as calculated from the allowable carbon dioxide concentration in the room, or keeping necessary amount of oxygen for combustion in a room using fire or flame, and standards based on pure technology or performance are not clear. In the present building technical field or industries, it has been a general trend not to spend too much money in ventilation system as far as the statutory requirements about ventilation are satisfied. [0006] On the other hand, a general ventilation system in a room demanding a certain habitability and working efficiency, for example, a professional kitchen ventilation system is composed, for example, in an overall ventilation system, as shown in FIG. 19, in which a combustion heating cooking device (a) as source of contaminant is disposed closely to the wall of the room, and the entire air of the kitchen is ventilated. [0007] That is, in the ceiling above the cooking device (a), a suction opening (c) is opened for a discharge duct (b), and discharge fan for duct (not shown) is provided at the outdoor side end of the discharge duct (b). The suction opening (c) is covered with a discharge hood (e) for capturing polluted air containing hot jet flow (d) of contaminants generated by combustion and heating of the cooking device (a), and diffusion of polluted air is prevented. On the other hand, in the ceiling of the central part of the room away from the cooking device (a), a discharge opening (h) of intake dust (g) having intake box (f) is opened, and an air conditioner (i) is installed. In the ceiling near an opening (m) remote from the cooking device (a), a discharge duct (k) having a ceiling discharge fan (j) is opened. [0008] The hot jet flow (d) of contaminants generated by combustion and heating of the cooking device (a) is captured into the discharge duct (b) from the discharge hood (e) and suction opening (c) by driving of dust discharge fan of the discharge duct (b), and is discharged out of the room, and the indoor air at a position remote from the cooking device (a) is discharged out of the room (not shown) through discharge duct (k) opened near the opening (m). On the other hand, from the intake opening (h) in the center of the ceiling, by driving of dust intake fan (not shown), fresh outdoor air is supplied through intake box (f) of intake duct (g), and also fresh air flows in from the window (m) of the kitchen. As a result, the entire air in the kitchen is ventilated. [0009] However, such conventional overall ventilation method has the following problems, and it has been desired to solve them. [0010] As represented by kitchen, when the overall ventilation system is installed in a room having many sources of contaminants, the ventilation rate is enormous and discharge efficiency is poor in ventilation, and since a huge volume of fresh air is introduced as intake, the indoor air becomes same as outdoor air. [0011] Discharge by suction and discharge stream by using mechanical power is poor in controllability, and only the contaminants cannot be discharged effectively, and heat, steam, oil fuse, odor or vapor may be stagnant in the room, and the indoor air conditioning state is poor. [0012] For example, in the case of kitchen, to satisfy the temperature and humidity condition of the kitchen as the standard of hazard analysis and critical control point (HACCP), a tremendous amount is required in ventilation air flow and air conditioning capacity. [0013] Increase of ventilation air flow and air conditioning capacity leads to increase of ventilation and air conditioning equipment capacity, and also increase in initial cost and running cost of ventilation and air conditioning equipment. [0014] In addition, increase of ventilation and air conditioning equipment capacity also leads to increase of electric capacity of equipment, and such increase of energy consumption also causes to increase outputs of global warming gases such as CO and CO.sub.2. [0015] Concerning this point, the following ventilation system of special application may be used in ventilation system in a room requiring specific habitability and working efficiency as ventilation system of kitchen. [0016] That is, in factory ventilation, since substances harmful for human health are released, statutory standards are strict, and sources of harmful contaminants are enclosed by partitions, and the operator puts hands into the partitions, and the partial or local ventilation system by draft chamber is widely employed as effective means. [0017] If the draft chamber cannot be used depending on the kind of work, the so-called push-pull flow method is executed as effective local ventilation system. In local ventilation system by push-pull flow method, sources of contaminants are enclosed by uniform flow of blowing (push) flow and sucking (pull) flow, and air balance is completed locally. [0018] Overall ventilation system for ventilating a wide space such as indoor parking facility includes so-called delivent ventilation system making use of induction action. In this delivent ventilation system, corresponding to suction discharge, indoor polluted air is guided and delivered to the suction opening by plural small blowers arranged sequentially, and by this method of ventilation, the duct extension distance can be shortened, and efficient ventilation is realized. [0019] However, even in such local ventilation system or overall ventilation system effective in special applications, when employed as ventilation system of a room requiring a certain habitability or working efficiency, there are new problems as listed below, it is far from the level of actual execution. [0020] That is, in the local ventilation method by draft chamber, since the sources of contaminants are enclosed by partitions, there is no risk of leak of polluted air into the room, but materials cannot be delivered onto the working surface through the door, the working efficiency is extremely poor. [0021] In the local ventilation method by push-pull flow type, contaminant sources are enclosed, and the air flow rate of induction stream and suction discharge stream is balanced in the entire surrounding space, and hence when the bore of the blow opening and the core of suction opening become large, the air flow rate increases tremendously. From the viewpoint of working efficiency, the worker gets into the uniform air flow, and in the case of kitchen, a lower blow opening is provided, different from the upper suction opening, and not only the working efficiency is lowered, but there is also problem of sanitation. [0022] The ventilation method by delivent ventilation system is overall ventilation method, not local ventilation, and assuming automotive emission to be collected in the ceiling of indoor parking facility, it is intended to guide in the discharge direction, and the discharge efficiency is enhanced, but the air flow rate is not decreased. Besides, since many small delivent fans are installed in the ceiling, the noise is very large. Continue reading... Full patent description for Method and device for local ventilation by buiding airflow and separating airflow Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method and device for local ventilation by buiding airflow and separating airflow patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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