JP4416809B2 - Negative pressure construction compartment air conditioner - Google Patents

Description

  The present invention relates to a negative pressure construction section air conditioner for improving a working environment in a negative pressure construction section when waste is treated by removing asbestos and the like.

  In order to prevent dust such as asbestos from being scattered outside the construction area when dismantling the building and removing the interior materials of the building, the construction section is covered with a plastic curing sheet and cured. A negative pressure construction section is known in which the inside of the construction section is maintained at a negative pressure to prevent dust from being scattered outside the construction section (for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-279861

  Thus, in the removal work in the negative pressure construction section of Patent Document 1, particularly in the summer, the internal temperature may reach 40 to 60 degrees, which may cause heat stroke, Therefore, a drastic countermeasure is desired.

  The subject of this invention is providing the negative pressure construction division air conditioner which improved the working environment in a negative pressure construction division and improved the work efficiency of asbestos processing.

Means for Solving the Problems and Effects of the Invention

The negative pressure construction section air conditioner of the present invention sucks the air in the negative pressure construction section and the negative pressure construction section cured by a plastic curing sheet, and removes asbestos dust contained in the air to the outside. An exhaust dust collector that exhausts the air, a cooling device that cools the air in the negative pressure construction section, and an outside air supply device that feeds air into the negative pressure construction section ,
The cooling device has two independent air-conditioning flow paths for sending cooled air into the negative pressure construction section and an exhaust flow path with a filter for discharging the air in the negative pressure construction section to the outside. One of the channel structure have a further includes a heat radiating part and the cooling part by circulation of the coolant, the cooling unit is installed in a flow path for air conditioning feeding air into the negative pressure construction compartment, and the heat radiation section negative pressure construction Installed in the exhaust flow path that exhausts the air in the compartment, cools the air sent to the negative pressure construction section by the cooling part, and the heat radiation part is cooled by the air discharged from the negative pressure construction part And
The filter that filters the air from inside the negative pressure construction section that has cooled the heat radiation part has the function of removing asbestos dust, and the air from which the asbestos dust in the negative pressure construction section has been removed is exhausted to the outside. It is supposed to
Each air supply / exhaust amount in the ventilation dust collector, the outside air supply device, and the cooling device is selected and controlled so as not to destroy the negative pressure state in the negative pressure construction section .

  By comprising as mentioned above, since the inside of a negative-pressure construction division can be made into a negative-pressure state, scattering to the exterior of the asbestos dust generated by asbestos removal can be prevented. In addition, since the room temperature in the negative pressure construction section can be lowered by the cooling device, the working environment is improved particularly in summer. As a result, the work efficiency of the asbestos treatment is improved without damaging the health of the worker.

In addition, the negative pressure construction section air conditioner is provided with an outside air supply device that supplies air into the negative pressure construction section where the air is exhausted by the exhaust dust collector and becomes negative pressure. It has adapted to supply the external air in contact with the negative pressure construction compartment which negative pressure is maintained Runode, since it supplied by lowering the temperature of the air supply from the outside by the external air air supply device The cooling capacity load of the cooling device can be reduced.
In addition, humidity can be given to the air supplied to the negative pressure construction section by the outside air supply device, so humidity management in the negative pressure construction section can be performed, and the generation of static electricity in the curing sheet is suppressed, and asbestos is applied to the curing sheet. It is possible to reduce the amount of dust adhering or to reduce the amount of asbestos dust floating in the air to improve the work efficiency of asbestos treatment (including removal of the final curing sheet).

In addition, the cooling device includes a cooling unit by circulating the refrigerant and a heat radiating unit, the cooling unit is installed in a flow path for air conditioning that sends air into the negative pressure working section, and the heat radiating unit is air in the negative pressure working section. It is installed in the exhaust flow path that discharges air, and the air sent to the negative pressure construction section is cooled by the cooling section, and the heat radiation section is cooled by the air discharged from the negative pressure construction section, The filter that filters the air from inside the negative pressure construction section that has cooled the heat radiation part has the function of removing asbestos dust, and the air from which the asbestos dust in the negative pressure construction section has been removed is exhausted to the outside. Therefore, even if the negative pressure function is lowered or stopped by the exhaust dust collector, it is possible to prevent the negative pressure destruction in the negative pressure construction section by the air that is cooled to the outside of the cooling device and exhausted to the outside. further, the negative pressure state of the negative pressure construction compartment Destroy not ventilated dust collector as outside air air supply device, in the cooling apparatus, thereby to control by selecting the respective supply and exhaust amount. As a result, the reliability of preventing asbestos dust from scattering to the outside is maintained and secured.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a schematic plan view showing a negative pressure construction section air conditioner according to the present invention. In FIG. 1, the negative pressure construction section air conditioner 1 has a construction area in order to prevent the generated asbestos dust from being scattered outside the construction area when removing the spray material including asbestos of the building 2. Is covered with a curing sheet 3 and is cured. The negative pressure construction section 4 includes a ventilation dust collector 20 that places the inside of the section in a negative pressure state with respect to the outside, an outside air supply device 30 that supplies external air, and a cooling device that cools the inside of the section. 40 is provided. The negative pressure construction section 4 is provided with a security zone 50 for workers to enter and leave the section. This security zone 50 is provided in order to prevent asbestos dust from leaking from the negative pressure construction section 4 to the outside.

  The curing sheet 3 for curing the negative pressure construction section 4 is formed into a sheet shape from polyethylene terephthalate (PET resin) as plastic. The curing sheet 3 is stretched and cured so as to cover the floor surface, wall surface, and the like. In addition, as the thickness of the curing sheet 3 is regulated for asbestos treatment in this example, when used on the floor surface, a sheet having a thickness of 0.15 mm or more is used in multiple layers (double). In addition, in the case of construction on a wall surface, one having a thickness of 0.08 mm or more is used as a single layer.

The ventilation dust collector 20 is arranged outside the negative pressure construction section 4. The ventilation dust collector 20 includes a ventilation dust collector main body 21, and the ventilation dust collector main body 21 includes a ventilation HEPA filter 22 and a ventilation fan 24 that is operated by a ventilation motor 23. The asbestos dust is captured and collected by the ventilation HEPA filter 22 by sucking air containing asbestos dust in the negative pressure construction section 4 by the ventilation fan 24. Thus, the cleaned air is exhausted to the outside, and the atmospheric pressure in the negative pressure construction section 4 is maintained and managed to be in a negative pressure state with respect to the outside.
This ventilation HEPA filter 22 is composed of a HEPA filter (High Efficiency Particulate Air Filter), and the collection of fine particles in the HEPA filter is “filtering (sieving effect)”, “inertia (collision)”, “cutting off (electrostatic) Adsorption) ”and“ Diffusion (Brownian motion) ”principles are applied, and 99.97% or more of 0.3 micron particles, which are considered to be the most difficult to catch, can be collected.

  A suction pipe 26 having a plurality of suction ports 25 is provided on the suction side of the ventilation dust collector 20 where the ventilation HEPA filter 22 is disposed in order to uniformly suck air containing asbestos dust in the negative pressure construction section 4. Is disposed. This negative pressure state is constantly measured and managed by a differential pressure gauge (not shown). In this example, the ventilation dust collector 20 is intermittently operated a plurality of times per hour to obtain a negative pressure state of −6 to −8 Pa.

  The outside air supply device 30 is disposed outside the negative pressure construction section 4. The outside air supply device 30 includes an outside air supply device main body 31, and the outside air supply device main body 31 is internally provided with a scrubber portion 32 and an air supply fan 34 that is operated by an air supply motor 33. Then, air is supplied into the negative pressure construction section 4 by sucking outside air with the air supply fan 34 and passing it through the scrubber portion 32. An air supply pipe 36 having a plurality of air supply ports 35 is connected to the air supply side. The air supply pipe 36 is disposed in the negative pressure construction section 4.

  As shown in FIG. 2, the scrubber portion 32 is disposed in an air supply flow path 37 provided to allow external air to flow into the negative pressure construction section 4. The scrubber part 32 is provided with a spray part 32 a for spraying so that the pressurized water is brought into contact with the air flowing through the air supply passage 37. The spray part 32a is comprised by the water storage part 32b provided in the lower part in the external air supply apparatus main body 31, and the pump 32c for supplying the circulating water in this water storage part 32b to the spray head 32d.

  The circulating water sprayed from the spray head 32d comes into contact with the air passing through the air supply passage 37, whereby dust and dust in the air are removed by the circulating water. At the same time, the passing air is cooled by contact with the circulating water and is given moisture.

  In addition, this type of contact includes a method of contacting air by passing air into the stored water, a method of contacting air with a water film of sprayed water on a filling material such as plastic and porcelain, and water with a rotating body. It is also possible to use a system in which the air is dispersed and contacted. It is also possible to further cool the air in contact with the circulating water by cooling the circulating water by putting a cooling body in a state where the water put in the PET bottle (not shown) is frozen in the water reservoir 32b. it can.

  Returning to FIG. 1, the cooling device 40 is disposed in the negative pressure construction section 4. The cooling device 40 includes a cooling device main body 41, a dust collection unit 42 for removing asbestos dust from the air in the negative pressure construction section 4, and an air conditioning unit 43 for cooling the air in the negative pressure construction section 4. Is provided.

  As shown in FIG. 3, the dust collection unit 42 and the air conditioning unit 43 are provided in a dust collection channel 40a and an air conditioning channel 40b as independent air channels.

  The dust collection unit 42 includes a fan 42b that is operated by a fan motor 42a and a HEPA filter 42c that captures and collects asbestos dust on the downstream side of the dust collection passage 40a. The air in the negative pressure construction section 4 is sucked by the fan 42b, and asbestos dust is removed when passing through the HEPA filter 42c. Thereafter, the cleaned air is exhausted to the outside from the ejection side.

  As shown in FIG. 3, the air-conditioning unit 43 is disposed so as to be connected to the dust collection channel 40 a and the air-conditioning channel 40 b. The air conditioning unit 43 includes an air conditioner 44. The air conditioner 44 includes a compressor 44a that compresses the refrigerant and pumps the refrigerant in a high temperature and high pressure state. The compressor 44a is connected to a condenser 44b as a heat radiating unit and an evaporator 44c as a cooling unit.

  The condenser 44b is disposed in the dust collection channel 40a. In this condenser 44b, the condenser 44b is cooled by the air sent from the condenser fan 44e operated by the heat radiation side drive motor 44d, and the medium flowing inside this condenser 44b is cooled and liquefied.

  The evaporator 44c is arrange | positioned in the air-conditioning flow path 40b. In the evaporator 44c, the liquid medium cooled and liquefied by the condenser 44b is injected into the evaporator 44c through an expansion valve (not shown) and vaporized at a stroke. The evaporator 44c is cooled by the vaporized refrigerant. Air sent from the evaporator fan 44g operated by the cooling drive motor 44f comes into contact with the evaporator 44c. Thereby, the room temperature in the negative pressure construction section 4 can be lowered by being cooled and turned into cold air and being supplied into the negative pressure construction section 4.

  The air passing through the condenser 44b and the evaporator 44c in the air conditioner 44 is air containing asbestos dust in the negative pressure construction section 4, and the asbestos is provided by a prefilter 45 provided on the suction side of the cooling device body 41. Since dust is primarily purified so as to be captured and supplied, the adhesion of dirt to the condenser 44b and the evaporator 44c itself is reduced. Furthermore, when the primary purified air passes through the HEPA filter 42c of the dust collection part 42, asbestos dust that could not be captured by the prefilter 45 can be further captured and collected, so that the negative pressure construction section 4 can be reliably prevented from splashing outside.

  The outside air supply device 30 and the cooling device 40 in the negative pressure construction section air conditioner 1 (see FIG. 1) are controlled by an inverter (not shown). In the control by the inverter, in the case of the outside air supply device 30, it is possible to control the supply amount of external air by the supply fan 34 and the supply amount of circulating water by the pump 32c (see FIG. 2). . In the case of the cooling device 40, the compressor 44a (see FIG. 3), the heat radiation side drive motor 44d, the rotation number of the cooling side drive motor 44f, and the like can be controlled to adjust the cooling capacity of the cooling device 40. It is. In addition, in order not to destroy the negative pressure state in the negative pressure construction section 4, the ventilation dust collection device 20 (see FIG. 1), the outside air supply device 30 and the cooling device 40 are controlled by selecting the respective supply and exhaust amounts. ing.

The plane schematic diagram which shows the negative pressure construction division air conditioner which concerns on this invention. The schematic diagram of an external air supply apparatus. The schematic diagram of a cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Negative pressure construction zone air conditioner 3 Curing sheet 4 Negative pressure construction zone 20 Ventilation dust collector 30 Outside air supply device 40 Cooling device 44a Compressor 44b Condenser (heat radiation part)
44c Evaporator (cooling part)

Claims (2)

Negative pressure construction section cured by plastic curing sheet,
An exhaust dust collecting device that sucks air in the negative pressure construction section, removes asbestos dust contained in the air and exhausts it to the outside;
A cooling device for cooling the air in the negative pressure construction section ;
An outside air supply device for supplying air into the negative pressure construction section ,
The cooling device is an independent air conditioning flow path that sends cooled air into the negative pressure work section and an exhaust flow path that includes a filter that discharges the air in the negative pressure work section to the outside. the have a two channel structure, further comprising a heat radiating portion and the cooling portion due to circulation of the refrigerant, the cooling unit is installing the air in the flow passage for air conditioning to be sent to the negative pressure construction compartment, and the radiator The unit is installed in a flow path for exhaust that discharges air in the negative pressure construction section, the air sent to the negative pressure construction section is cooled by the cooling section, and the heat radiating section is discharged from the negative pressure construction section. To be cooled by the air that
The filter that filters the air from inside the negative pressure construction section that has cooled the heat radiation part has a function of removing asbestos dust, and the air from which the asbestos dust in the negative pressure construction section has been removed is external To be exhausted,
Negative pressure characterized by selecting and controlling the amount of supply and exhaust air in the ventilation dust collector, the outside air supply device, and the cooling device so as not to destroy the negative pressure state in the negative pressure construction section Construction compartment air conditioner. 2. The negative pressure construction section air conditioning apparatus according to claim 1, wherein the outside air supply apparatus feeds outside air brought into contact with water into the negative pressure construction section in which a negative pressure is maintained .

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