JPH06246207A - Coating booth with air feeding - Google Patents

Abstract

PURPOSE:To make it possible not to feed supermoistened air conditioning air in a coating booth even when external air with high humidity is introduced in an air conditioner as the rainy season in the coating booth with air feeding wherein a flow path through which the external air is introduced into the air conditioner feeding conditioned air into the coating booth and a rotor of a rotary heat exchanger riding on a flow path exhausting exhaust gas from the coating booth and rotating, are provided. CONSTITUTION:Sensors S1 and S2 detecting humidity of the external air indroduced into an air conditioning apparatus 2 or humidity of the conditioned air fed in a coating booth 1 and a controlling apparatus 5 decresing the rotating speed of or stopping said rotor 4 when the humidities detected by means of said humidity sensor S1 and S2 exceed preset allowable upper limiting value, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type rotating across a flow path for introducing outside air into an air conditioner for supplying conditioned air to a coating booth and a flow path for discharging exhaust gas from the coating booth. The present invention relates to a coating booth with air supply provided with a rotor of a heat exchanger.

[0002]

2. Description of the Related Art A large air-conditioned paint booth for painting automobiles controls the temperature and humidity of the outside air introduced into the air conditioner, and sends, for example, conditioned air having a temperature of 21 degrees and a humidity of 80% to the painting booth. I am trying to pay. And temperature control the outside air
In order to reduce the running cost during humidity control, conventionally, the honeycomb-shaped moisture absorption is made so as to span the flow path of the outside air introduced into the air conditioner and the flow path of the exhaust gas discharged from the coating booth. A rotary heat exchanger is used in which a rotor (rotary heat storage body) made of a porous material is rotated to heat the outside air by utilizing the heat of exhaust gas (Japanese Patent Laid-Open No. 57-10506).
No. 3, 62-66033). Next, the outside air that has passed through this heat exchanger is temperature-controlled / humidified to a predetermined temperature / humidity by a heater, a humidifier, etc. arranged in the air conditioner and supplied to the coating booth.

[0003]

However, the rotor of the rotary heat exchanger imparts not only the heat of the exhaust gas but also about 60% of the moisture contained in the exhaust gas to the outside air side. If the humidity is originally high, it will be over-humidified through the rotor, and even if the humidifier in the air conditioner is stopped, over-humidified air-conditioned air will be supplied to the coating booth and condensation will form in the coating booth. There is a problem that it will occur.
Therefore, the present invention has a technical problem to prevent the excessively humidified air-conditioned air from being supplied into the coating booth even when high-humidity outside air is introduced such as in the rainy season.

[0004]

In order to solve this problem, the present invention provides a flow path for introducing outside air into an air conditioner for supplying conditioned air to a coating booth and a flow for discharging exhaust gas from the inside of the coating booth. Detects the humidity of outside air introduced into the air conditioner or the humidity of conditioned air supplied into the coating booth in the air-supplying coating booth equipped with the rotor of the rotary heat exchanger that rotates across the road. A humidity sensor and a control device for decreasing or stopping the rotation speed of the rotor when the humidity detected by the humidity sensor exceeds a preset allowable upper limit value are provided.

[0005]

According to the present invention, when the humidity of the outside air introduced into the air conditioner or the humidity of the conditioned air supplied to the coating booth exceeds a preset allowable upper limit value, the rotor of the rotary heat exchanger is The rotation speed is reduced or stopped, and in response,
Since the amount of water taken into the outside air out of the water contained in the exhaust gas is also reduced, it is possible to prevent the excessively humidified conditioned air from being supplied to the coating booth.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a flow sheet showing a supply booth with air supply according to the present invention, and FIGS. 2 and 3 are flow sheets showing another embodiment.

In this example, rotary total heat exchange for exchanging heat between the outside air introduced into the air conditioner 2 for supplying conditioned air to the coating booth 1 and the exhaust gas discharged from the inside of the coating booth 1. The rotor 4 of the container 3 is configured to rotate across the flow path F _{1 of} outside air and the flow path F _{2 of} exhaust gas.

Reference numeral 5 denotes a control device for controlling the rotation speed of the rotor 4, which is supplied to the interior of the coating booth 1 and a humidity sensor S ₁ for detecting the humidity of the outside air introduced into the air conditioner at its input side. Humidity sensor S ₂ for detecting the humidity of conditioned air
Is connected to the motor 6 and drives the rotor 4 on its output side.
Are connected. Then, the control unit 5 is preset with an upper limit humidity (allowable upper limit value) capable of maintaining an appropriate humidity inside the coating booth, and _one of the humidity detected by each of the sensors S ₁ and S ₂ is When the allowable value is exceeded, a control signal for reducing the rotation speed is output to the motor 6 that drives the rotor 4.

The air conditioner 2 controls the temperature of the primary air 9 and the secondary filter 10 for removing dust in the outside air introduced into the air conditioning room 8 from the air supply gallery 7, and the outside air purified by these filters. .Humidifier 11 and cooler 1 for controlling humidity
2. A heater 13 and the like are connected at regular intervals, and the conditioned air is fed into the air supply chamber 15 of the coating booth 1 by the air supply fan 14.

In the coating booth 1, the conditioned air sent from the air conditioner 2 into the air supply chamber 15 flows down into the coating chamber 17 through the filter 16 at a predetermined wind speed, so that the air in the coating chamber 17 is coated. The mist, the evaporated organic solvent, etc. are sucked into the exhaust treatment chamber 18 under the floor through the gas-liquid contact mechanism 19, the paint mist and the like are separated and removed by the gas-liquid contact mechanism 19, and then discharged by the exhaust fan 20. Has been done.

The above is an example of the configuration of the present invention, and its operation will be described below. The outside air introduced into the air conditioner 2 from the air supply gallery 7 is heat-exchanged with the exhaust gas via the rotor 4 of the rotary total heat exchanger 3, and part of the heat and moisture of the exhaust gas is taken into the outside air. Thereafter, the humidifier 11 and the heater 13 adjust the temperature and the humidity to, for example, a temperature of 21 degrees and a humidity of 80%, and supply the temperature to the coating booth 1.

At this time, the humidification amount and the heating amount by the humidifier 11 and the heater 13 are adjusted based on the humidity and temperature of the conditioned air supplied to the coating booth 1, and when the humidity of the outside air becomes high, the conditioned air is increased accordingly. The humidity of the humidifier 11 is gradually decreased because the humidity of the humidifier 11 is gradually increased. However, if the humidity of the outside air exceeds a preset allowable upper limit value, the conditioned air is overhumidified even if the humidification by the humidifier 11 is stopped. Becomes

Therefore, when the humidity of the outside air or the humidity of the conditioned air detected by the humidity sensor S ₁ or S ₂ exceeds the allowable upper limit value, the control device 5 causes the rotor 4 of the total heat exchanger 3 to change.
A control signal for reducing or stopping the rotation speed of the air conditioner is output, the amount of water taken from the exhaust air to the outside air via the total heat exchanger 3 is decreased, and the conditioned air is maintained at an appropriate humidity to achieve the coating booth 1. It is possible to prevent the inside from being excessively humidified.

FIG. 2 is a flow sheet showing another embodiment. In this example, the flow path F ₂ for exhausting the exhaust gas from the coating booth 1 does not pass through the rotor 4 of the total heat exchanger 3. Bypass flow path F that can bypass from the upstream side of the rotor 4 to the downstream side
₃ is formed, and when the humidity of outside air or conditioned air detected by the humidity sensor S ₁ or S ₂ exceeds a preset allowable upper limit value, the damper 21 interposed in the bypass flow passage F ₃ is formed. There is provided a control device 5 for opening or increasing the opening degree.

Therefore, when the humidity of the outside air or the conditioned air exceeds the allowable upper limit value, the exhaust gas also flows to the side of the bypass flow path F ₃ and the flow rate through the exhaust flow path F ₂ is reduced, so that the total heat exchanger 3 Through this, the amount of water taken into the outside air is reduced and overhumidification is prevented.

FIG. 3 is a flow sheet showing still another embodiment. In this example, a flow path F ₁ for introducing outside air into the air conditioner 2 is provided from the outside of the air conditioner 2 to the downstream side of the rotor 4. An open / closed outside air sampling port 22 for directly introducing outside air is provided, and when the humidity of the outside air or the conditioned air detected by the humidity sensor S ₁ or S ₂ exceeds a preset allowable upper limit value, the outside air is introduced. A control device 5 that opens the sampling port 22 or increases the opening is provided.

Therefore, when the humidity of the outside air or the conditioned air exceeds the allowable upper limit value, a part of the outside air is directly introduced into the air conditioner 1 without passing through the rotor 4, so that the exhaust air is exhausted via the total heat exchanger 3. As a result, the amount of water taken in from the outside is reduced, and overhumidification is prevented.

In the description of the embodiment, the humidity sensor S ₁
The case where both the humidity of the outside air and the humidity of the conditioned air are detected by S and S ₂ has been described.
It may be a case where only one of them is detected. Also,
The normal exhaust flow path F ₂ may be cut off when the bypass flow path F ₃ is opened, or the normal outside air flow path F ₁ may be cut off when the outside air collection port 22 is opened.

[0019]

As described above, according to the present invention, when the humidity of the outside air or the conditioned air exceeds the allowable upper limit value, the rotation speed of the rotor of the rotary heat exchanger is reduced or stopped, and the rotor is replaced. Since the efficiency is reduced and the amount of water taken in from the exhaust air to the outside air is also reduced, it is an excellent effect that it is possible to prevent the paint booth from becoming over-humidified even when the humidity of the outside air becomes high. Have.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example of a paint booth with air supply according to the present invention.

FIG. 2 is a flow sheet showing another embodiment.

FIG. 3 is a flow sheet showing still another embodiment.

[Explanation of symbols]

1 ... Painting booth 2 ... Air conditioner 3 ... Rotating heat exchanger 4 ... Rotor 5 ... Controller S ₁ , S ₂ ... Humidity sensor F ₁ ... Outside air flow path F ₂ the flow path of the ... exhaust F ₃ ·· bypass flow path 21 ... damper 22 ... ambient air sampling port

Claims (3)

[Claims] 1. A flow path (F ₁ ) for introducing outside air into an air conditioner (2) for supplying conditioned air to a coating booth (1) and a flow path (F) for discharging exhaust gas from the inside of the coating booth (1). ₂ ) In a coating booth with air supply provided with a rotor (4) of a rotary heat exchanger (3) that rotates over the air conditioner (2), the humidity of the outside air introduced into the air conditioner (2) or the coating booth (1) ), A humidity sensor (S _1, S ₂ ) that detects the humidity of the conditioned air
A control device (5) is provided for reducing or stopping the rotation speed of the rotor (4) when the humidity detected by the humidity sensor (S _1, S ₂ ) exceeds a preset allowable upper limit value. A paint booth with air supply. 2. A flow path (F ₁ ) for introducing outside air into an air conditioner (2) for supplying conditioned air to the coating booth (1) and a flow path (F) for discharging exhaust gas from the inside of the coating booth (1). _{In a} coating booth with air supply provided with a rotor (4) of a rotary heat exchanger (3) that rotates across ₂ ), a flow path (F ₂ ) for discharging exhaust gas from the coating booth (1) The outside air introduced into the air conditioner (2) while forming a bypass flow path (F ₃ ) that can bypass the rotor (4) from the upstream side to the downstream side of the rotor (4) without passing through the rotor (4). Humidity sensor (S
_1, S ₂ ) and the humidity detected by the humidity sensor (S _1, S ₂ ) exceeds a preset allowable upper limit value, the bypass passage (F ₃ ) is opened or the opening degree is changed. A paint booth with air supply, characterized in that a control device (5) for enlarging is provided. 3. A flow passage (F ₁ ) for introducing outside air into an air conditioner (2) for supplying conditioned air to the coating booth (1) and a flow passage (F for discharging exhaust gas from the inside of the coating booth (1). ₂ ) In a paint booth with air supply provided with a rotor (4) of a rotary heat exchanger (3) that rotates across ₂ ), a flow path (F ₁ ) for introducing outside air into an air conditioner (2) An openable / closable outside air sampling port (22) for introducing outside air directly from the outside of the air conditioner (2) to the downstream side of the rotor (4) is provided, and the humidity of the outside air introduced into the air conditioner (2) is also provided. or a humidity sensor for detecting humidity of the conditioned air supplied to the coating booth (1) in (S _1, S _2), humidity detected in the humidity sensor (S _1, S ₂₎ is preset permissible A control device (5) is provided for opening the outside air collection port (22) or increasing the opening when the upper limit is exceeded. Feeding care paint booth characterized by Rukoto.