JP2006112716A - Closed space ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed space ventilation system excellent in ventilating property, mountable with minimized disturbance to the work, and operable with a low power consumption. <P>SOLUTION: In this system, one air blowout part blowing an air flow having a uniformed velocity distribution and a low velocity equal to or close to a laminar flow or a combination of two or more thereof, and one air suction part sucking an air flow having the same low velocity as it or a combination of two or more thereof are provided in mutually opposed positions adjacent to an air contamination source in conformation to each other so as not to interfere with each other. One air blowout part blowing an air flow having the same low velocity as described above or a combination of two or more thereof, and one air suction part sucking an air flow having the same low velocity as it or a combination of two or more thereof are provided along two opposed wall surfaces in conformation to each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a closed space ventilation system that is surrounded by a wall, such as a paint shop, and in which an air pollution source exists, and is excellent in ventilation performance despite a small air volume. The present invention relates to an apparatus that prevents contact with a pollutant and that operates with low power consumption with less trouble on the layout.

In a closed space where a wall is surrounded by a wall such as a paint shop and an air pollution source exists inside, an operator may inhale health contaminated with solvent vapor generated from the pollution source, thereby impairing health. A ventilation system is provided to ventilate the air by blowing air into the closed space and sucking out the air within the closed space. As one of them, ventilation by a push-pull booth has been proposed (for example, Non-Patent Documents 1, 2, and 3). In particular, the area of the air outlet of the air outlet is increased to reduce the outlet speed, In order to make the velocity distribution uniform and to realize it, a combination of adjustment plates (vanes, distribution plates) is preferred instead of resistors and filters with high pressure loss.

  In addition, the above-mentioned document also describes that air is supplied separately into the worker area and the article processing area, but the two air flows are in contact with each other over a wide area, and there is diffusive mixing of air between them. As a result, there remains a risk of workers coming into contact with contaminants. On the other hand, although there is a description about equalization of the velocity distribution not only at the air outlet of the air outlet but also at the air inlet of the air inlet (for example, Non-Patent Document 4), this is the object of the present invention. There is no mention of ventilation in a closed space that is surrounded by walls and has air pollution sources inside.

Japan Work Environment Measurement Association: Work Environment Measurement Special Issue 22 (Month, Heisei 24-24) Japan Work Environment Measurement Association: Work Environment Measurement Special Issue 26 (February 1994, 60-61) Ministry of Labor Ordinance No. 13: Amendment of Organic Solvent Poison Prevention Regulations (March 1997) HORIGO Hiromasa: Chemical equipment (June 1993, 92-93)

  In view of the above, the present invention is a closed space ventilation system which is surrounded by a wall and has an air pollution source inside, in order to eliminate the above-described drawbacks of the prior art. An object of the present invention is to provide a device that is excellent in ventilation, prevents contact with contaminants of an operator, operates with low power consumption, and has few troubles in terms of arrangement.

In order to achieve the above object, a closed space ventilation system according to the invention of claim 1 blows air into a closed space surrounded by a wall and has an air pollution source inside, and the air is closed. A ventilation system that ventilates air by sucking out air in a space, in which one or a plurality of air blowing portions that blow out a low-speed air flow that has a uniform velocity distribution and is close to a laminar flow or a laminar flow; A velocity distribution is uniform, and one or a combination of a plurality of air suction portions that suck in a laminar flow or a low-velocity air flow close to the laminar flow correspond to each other so as not to interfere with each other and approach the air pollution source. One or a combination of one or a plurality of air blowing portions that are separately provided with a uniform velocity distribution and blow a laminar flow or a low-speed air flow close to the laminar flow, and a uniform velocity distribution and a laminar flow or Provided along one of the wall surfaces including the ceiling of the closed space corresponding to at least one pair of one or a plurality of air suction portions for sucking a low-speed air flow close to a laminar flow Yes.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, each of the air blowing portions is configured such that the air supplied in a direction parallel to the blowing surface is uniform from the blowing surface to a direction perpendicular thereto. A plurality of vanes for airflow distribution uniformization are juxtaposed in the air so that the air sucked into each air suction portion is parallel to the air suction surface in a direction perpendicular to the air suction surface. A plurality of vanes for equalizing the airflow distribution are juxtaposed in the interior so as to be discharged in any direction,
In addition, the area of the blowing surface of each air blowing section is larger than that of the cross section perpendicular to the blowing face, and the area of the sucking surface of each air sucking section is larger than that of the cross section perpendicular to the suction surface. It is configured.

In addition to the configuration of the invention of claim 1 or 2, the invention of claim 3 is configured such that the specification of the ventilation system is determined based on the results of a case study by a flow simulator for a plurality of conditions. Yes.

In addition to the configuration of the invention of claim 3, the invention of claim 4 is configured such that, when being introduced into the existing closed space, the current state is first investigated and reproduced on the flow simulator. .

 According to the first aspect of the present invention, one or a plurality of air blowing portions (hereinafter abbreviated as “air blowing portion”) and one or a plurality of air suction portions (hereinafter referred to as “air”) are combined. (Abbreviated as suction part) and arranged so as to face each other in the state of being close to the whole air pollution source, the velocity distribution uniform and low-speed air flow blown out from the blowing part It passes through the air pollution source as it is without almost diffusing, entraps and entrains the pollutant generated from it, and is sucked into the air suction section at a low speed with a uniform velocity distribution with little diffusion to the surroundings. Therefore, the partial ventilation can be realized with an extremely small amount of air and low power consumption, while hardly moving most of the air in the closed space and hardly polluting the closed space with pollutants.

In addition to the above, uniform air velocity distribution, low speed, and a small amount of air are blown out from an air blowing portion similar to the above, which is disposed on any one of the wall surfaces away from the air pollution source. The air blowing portion and the air suction provided close to the above-mentioned air pollution source by being sucked at a low speed at a uniform speed distribution into the air suction portion similar to the above-described one, which is disposed on the wall of It is possible to reduce the disturbance of the air flow caused by the parts, and to ventilate the surrounding parts that are insufficiently ventilated to prevent the accumulation and accumulation of pollutants at any point in the closed space. In particular, the concentration of contaminants in the operator's work area can be easily suppressed below an allowable value.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the air blowing part and the air suction part are both wide and thin, and a plurality of air flow distributions are made uniform. Since the vanes are juxtaposed, for example, if placed on the top, side, or other wall surface including the ceiling of the air pollution source, the operation and maintenance of the equipment that is the air pollution source, as well as the obstacle to the work of the worker are minimized. The power consumption is low because it is low speed and does not require wasteful resistance for uniform speed distribution.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, a case study on a plurality of conditions is performed by the proven flow simulator, and the specification of the ventilation system is based on the result. Therefore, the design accuracy is remarkably improved and costs such as operation costs are suppressed to a minimum as compared with those not based on it.

  According to the invention of claim 4, in addition to the effect of the invention of claim 3, when introducing into the existing closed space, since the reproduction on the current flow simulator investigated first is carried out, it is incorporated. As a result, it is possible to perform more accurate performance prediction and economic prediction compared to the newly established one, and further optimum design is possible.

  As an example of a closed space ventilation system related to the best mode for carrying out the present invention, what is applied to an existing steel sheet coating chamber will be described with reference to FIG. As will be described later, it is used as a painting chamber. 1a, 1b, 1c and 1d are wall surfaces thereof, D is a door for entering and exiting the closed space 1, 2 is a coating device for continuously coating a steel plate disposed substantially in the center of the closed space 1, and 2a is a Attached equipment such as a driving device provided around, 3a is a cleaning work place for parts and the like installed near the wall surface 1a, 3b is a stirrer for mixing paint installed near the corner where the wall surfaces 1a and 1d intersect, 3c is This is a paint supply station.

A description will be given of the equipment and components that make up the ventilation system. Reference numeral 5 denotes an air duct installed horizontally along the wall surfaces 1a and 1b and the ceiling, and a plurality of air ducts that blow air toward the coating device 2 side. An air outlet is provided (not shown). Reference numeral 6 denotes two air suction portions installed vertically along the wall surface 1d opposite to the installation wall surface of the air duct 5; It is an air suction part installed on the floor near the front. In addition, although illustration is abbreviate | omitted, the three air suction parts are each provided above the said washing | cleaning work place 3a, the stirrer 3b, and the mixing supply place 3c (all are existing goods).

Next, 10 is the three air blowing portions installed vertically along the side surface (wall surface 1a side) of the coating apparatus 2, and 11 is installed horizontally along the coating apparatus 2 and extends to near the wall surface 1d. The air sucking part 12 is two air blowing parts arranged side by side along the wall surface 1a (newly provided). Note that the two air suction portions 6 arranged side by side along the wall surface 1d are modified to meet the object of the present invention (described later).

More specifically, the air sucking portion 11 has a direction in which air that has flown uniformly in a direction perpendicular to the suction surface A is parallel to the suction surface A, as schematically shown in FIG. A plurality of airflow distribution equalizing vanes V1 are juxtaposed in the interior so that the suction surface A has an area larger than a cross-sectional area perpendicular to the suction surface A. In addition, the structure of the air blowing part 6 is also substantially the same.

On the other hand, as schematically shown in FIG. 2B, the air blowing unit 10 blows air supplied in a direction parallel to the blowing surface B from the blowing surface B in a direction perpendicular thereto. As described above, a plurality of airflow distribution uniformizing vanes V2 are juxtaposed in the air blowing section 10, and the area of the blowing face B is set to be larger than the area of the cross section perpendicular thereto. In addition, the structure of the air blowing part 12 is also substantially the same. In this case, it is a matter of course that the design takes into account the influence of the plurality of air outlets 5a of the air duct 5.

In addition, although detailed illustration is omitted, each of the three air blowing portions 10 combined with the vane V2 is opposed to the vane V1 while being close to an air pollution source formed by the coating apparatus 2. The combined air suction part 11 is disposed so as to face the air pollution source composed of the coating apparatus 2 so as not to interfere with the air blowing part 10.

  The operation will be described. The air blowing section 10 and the air suction section 11 are configured to have low resistance, low pressure loss, and low wind speed, and are disposed so as to face each other particularly in the state of being close to the coating measure 2 that is an air pollution source. Therefore, the flow of air having a uniform velocity distribution and low speed blown out from the blowing surface B of the air blowing unit 10 passes through the air pollution source as it is without almost diffusing to the surroundings, and the pollutant generated therefrom. The air is sucked into the air suction surface A of the air suction section 11 at a low speed and with a uniform velocity distribution with little diffusion to the surroundings. Accordingly, partial ventilation can be realized with a very small amount of air and low power consumption, while hardly moving most of the air in the surrounding space 1 and the surrounding space 1 and hardly polluting the closed space 1 with pollutants. In addition, since the air blowing section 10 and the air suction section 11 are thin and widely formed, the operation maintenance of the coating apparatus 2 that is an air pollution source and the trouble to the work of the worker can be minimized. In order to make the speed distribution uniform, no unnecessary resistance is required and the power consumption is low.

In addition, uniform air velocity distribution, low speed, and a small amount of air are blown out from the air blowing portion 12 arranged on one of the opposing wall surfaces 1a and 1d away from the air pollution source and arranged on the vane. The air suction portion 6 in which the vane is disposed is sucked at a uniform speed distribution and at a low speed, so that the turbulence of the air flow generated by the air blowing portion 10 and the air suction portion 11 can be suppressed. In addition, as will be described later, it is possible to ventilate other parts together with the surrounding parts that are insufficiently ventilated, thereby preventing the accumulation and accumulation of contaminants at any point in the closed space 1. Also, the concentration of contaminants in the worker's work area can be reduced very easily below the allowable value. Moreover, since the air blowing section 12 and the air suction section 6 are thin and wide and are installed along the wall surfaces 1a and 1b, there is almost no hindrance to the operation and maintenance of the coating apparatus 2 and the work of the worker. Absent.

  In addition, a small amount of air pollutants from the cleaning work place 3a, the stirrer 3b, and the preparation supply place 3c are captured and entrained by the air outlet 5a of the existing air duct 5 that is disposed in the vicinity thereof, It is sucked out by three air sucking portions (not shown) provided above. In addition, the air sucking unit 7 existing on the floor in the immediate vicinity of the coating apparatus 2 also contributes to sucking out some of the contaminants from the coating apparatus 2.

In designing the above ventilation system, we conducted a case study on multiple conditions using a proven flow simulator and determined the specifications of this ventilation system based on the results. In addition, because it was a modification of the existing one, prior to that, the current flow simulator that had been measured and investigated in advance was reproduced on the flow simulator, and the result was incorporated into the case study. As a result, the design accuracy is remarkably improved compared to those that are not based on flow simulators and those that are newly installed, and a lot of luxury meat can be scraped off equipment, minimizing equipment costs and operating costs. I was able to suppress it.

The concentration of the solvent before and after the remodeling of each point in the closed space 1 (144 square meters) was measured, in which the steel sheet used for 200 t / month was combined with the paint and its solvent. As a result, the change in toluene concentration (ppm) before and after the remodeling at each point marked with * in Fig. 1 is as follows. Improved.

It is an equipment arrangement top view showing an example of the best form for carrying out the present invention. It is a perspective view of the air suction part (a) and air blowing part (b) used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Closed space 1a Wall surface 1b Wall surface 1c Wall surface 1d Wall surface 2 Coating apparatus 2a Accessory equipment 3a Cleaning work place 3b Stirrer 3c Preparation supply field 5 Air duct 6 Air sucking part 7 Air sucking part 10 Air blowing part 11 Air sucking part 12 Air blowing part A Suction surface B Outlet surface

Claims (4)

A ventilation system for ventilating by blowing air into a closed space surrounded by a wall and having an air pollution source inside, and sucking out the air in the closed space, having a uniform velocity distribution and laminar flow or One or more of the air blowing parts that blow out a low-speed air flow close to laminar flow, and one of the air suction parts that suck in a low-speed air flow that is uniform in velocity distribution and close to laminar flow or laminar flow, or A plurality of combinations are provided so as to be close to the air pollution source so as not to interfere with each other and to be opposed to each other. A combination of one or a plurality of air blowing parts to be blown out and one or a plurality of air suction parts for sucking a low-speed air flow with uniform velocity distribution and close to laminar flow or laminar flow Of at least one set correspondingly, it is provided along one wall including ceiling closed space and
A closed space ventilation system. Each of the air blowing portions has a plurality of vanes for uniform airflow distribution therein so that air supplied in a direction parallel to the blowing surface is uniformly blown from the blowing surface in a direction perpendicular thereto. Are arranged side by side, and each of the air suction portions has a plurality of air flow distributions made uniform so that air that has flown uniformly in a direction perpendicular to the suction surface is discharged in a direction parallel to the suction surface. Vanes are juxtaposed, in addition, the area of the blowing surface of each of the air blowing portions is larger than that of the cross section perpendicular to the blowing surface, and the area of the suction surface of each of the air sucking portions is perpendicular to the suction surface. The closed space ventilation system according to claim 1, wherein the ventilation system is larger than that of a cross section. The ventilation system in a closed space according to claim 1, wherein the determination of the specification of the ventilation system is performed based on a result of a case study by a flow simulator for a plurality of conditions. 5. The ventilation system according to claim 4, wherein, when the system is introduced into an existing closed space, the current state is first investigated and reproduced on the flow simulator.

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