JPH05113241A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent occurrences of malfunction of sensor due to high temperature, dust, and high humidity by installing sensors for control of air conditioner on the downstream side of a prefilter for return air and on the upstream side of a mixing part of return air and fresh air. CONSTITUTION:An air conditioner includes a suction fan 1, an exhaust fan 3, and an outside air fan 4, each of which can be operated at variable speed by an inverter 2, a main filter 5, a low hot water coil 6, and a total heat exchanger 7. Return air from a room to be air-conditioned passes through a prefilter 8 for return air and is divided into two portions from a section 9, one portion of which is passed through an exhaust damper 10 and the total heat exchanger 7 to be discharged, while the other portion is mixed with outside air at the section 9 and then passed through a supply air passage and supplied into the room to be air-conditioned. Temperature sensors 21-23 for supply air, return air, and outside air, CO2 sensor 24, humidity sensor 25, supply air pressure sensor 26, and differential pressure sensors 27-29 are installed on the downstream side of the prefilter 8 and the upstream side of a mixing part of return air and outside air, thereby preventing high temperature, high humidity, and dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner equipped with various control sensors.

[0002]

2. Description of the Related Art A typical conventional air conditioner having a total heat exchanger will be described with reference to FIG. FIG. 2 is a diagram showing a schematic configuration of a conventional air conditioner. The air conditioner includes an air supply fan 31 that supplies air to the room, a return air fan 32 that recirculates the room air, and a main filter 33 that filters the air.
And a cold / hot water coil 34 and a total heat exchanger 35.

The operation of the conventional air conditioner will be described with reference to FIG. 2. The air supply to the room is sucked from the compartment 36 through the main filter 33, the cold / hot water coil 34 and the compartment 37 into the air supply fan 31 to be boosted. Then, the air is supplied to the air-conditioned room (not shown) through the air supply duct 38. On the other hand, the return air from the room is sucked into the return air fan 32 through the return air duct connection port 39 to be boosted in pressure, then enters the compartment 40, is branched, and one is exhausted as a total heat exchanger 35, It is discharged to the outside of the room through the compartment 41 and the exhaust duct connection port 42, and the other one enters the compartment 36 through the damper 43, is mixed with the outside air, and is again supplied to the room through the supply path. The outside air supplied as fresh air into the room enters the compartment 36 from the outside air intake 44 through the total heat exchanger, is mixed with the return air, and is then supplied into the room through the supply air path.

Next, a method of installing various sensors of a conventional air conditioner will be described.

As shown in FIG. 2, in the air conditioner, in the compartment 37 which is the secondary side of the cold / hot water coil 34, the temperature sensor 46 for supply air and the return air system passage upstream of the prefilter 47 for return air are provided. The temperature sensor 48 for the outside air and the temperature sensor 49 for the outside air provided upstream of the prefilter 50 for the outside air are provided. The air conditioner is a return air pre-filter 47.
A CO ₂ sensor 51 for detecting the cleanliness of recirculated air is provided on the return air path on the upstream side of. Further, the air conditioner has an air humidity sensor 5 in the return air passage upstream of the return air pre-filter 47.
Equipped with 2.

Further, the air conditioner is equipped with a differential pressure gauge for detecting clogging of each filter. That is, a differential pressure sensor 53 having detection ends on the inlet side and the outlet side of the main filter 33, a differential pressure sensor 54 having detection ends on the inlet side and the outlet side of the return air pre-filter 47, and an outside air pre-filter. Differential pressure sensor 55 having detection ends on the inlet side and the outlet side of the filter 50
And are installed. On the other hand, the air supply pressure sensor 56 is installed outside the air conditioner adjacent to the air supply duct 38. As described above, various sensors are distributed and installed in various places.

Next, the environment of the location where the various sensors are installed will be explained. The secondary side of the cold / hot water coil 34, which is the location where the temperature sensor 46 for air supply is installed, is a very high humidity location. There is. For example, when cooling, the hot and cold water coil 3
The secondary side exiting No. 4 has a high humidity of 90% or more in relative humidity, and when the humidifier is operated even during heating, it is in a high humidity state of 80 to 90%. The temperature sensor is
The detection end is relatively strong against the environment, but since the sensor body connected to this detection end uses electronic parts, it is very weak against high humidity.

Further, since the CO ₂ sensor 51, the ambient air temperature sensor 48, or the ambient air humidity sensor 52 is installed on the upstream side of the return air pre-filter 47, dust and dirt from the room are installed. Many flow into the place. Since these sensors also use electronic parts in the sensor body, they are extremely vulnerable to dust and dirt.

Further, since the temperature sensor 49 for the outside air is also installed in a place where the outside air comes into direct contact, dust easily gets in,
It was placed in an unfavorable environment for the sensor. Similarly, the differential pressure sensors 54 and 55 were not installed in a good environment.

[0010]

As described above, the various sensors of the conventional air conditioner have been installed in a high humidity place or a place where much dust is present. That is, in the conventional air conditioner, there is a problem that the installation environment of various sensors is bad. In addition, the sensors are often inoperable due to the poor installation environment.

Further, since various sensors are distributed and installed in various places, there is a problem that maintenance is very poor.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to install various sensors in a location that is favorable in terms of the environment in which the sensor is installed and to collect the various sensors in one location. It is to provide an air conditioner that can be installed.

[0013]

In order to achieve the above-mentioned object, an air conditioner of the present invention comprises a cold / hot water coil, an air supply fan for supplying air to the room, and an exhaust air for discharging the air in the room to the outside. A fan, an outside air introduction fan for introducing outdoor air, a return air pre-filter, an outside air pre-filter,
A main air supply filter, the return air from the air-conditioned room passes through the return air pre-filter, and part of the return air is exhausted to the outside by the exhaust fan, and the return air and the outside air An air conditioner that mixes with the outside air introduced by the outside air introduction fan through the pre-filter for use, cools during cooling by the cold / hot water coil, heats during heating, and supplies the air into the air-conditioned room by the air supply fan. A device for controlling the air conditioner, wherein the sensors for controlling the air conditioner are installed on the downstream side of the return air prefilter and on the upstream side of the mixing portion of the return air and the outside air. is there.

[0014]

According to the present invention having the above-described structure, various sensors are installed on the downstream side of the return air pre-filter and on the upstream side of the mixing section of the return air and the outside air, so that the environment in which the sensor is installed is improved. Sensors can be installed in good locations, and will not cause malfunctions due to high temperature and high humidity and dust. Further, since various sensors are installed in one place, the maintainability of the sensors is extremely good.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an air conditioner according to the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing a basic configuration of an air conditioner according to the present invention. The air conditioner is an air supply fan 1 for supplying air into a room with a variable air flow rate for variable speed operation by an inverter 2. An exhaust fan 3 for discharging indoor air to the outside, an outside air fan 4 for introducing outdoor air, a main filter 5 for filtering the air, a cold / hot water coil 6, and a total heat exchanger 7. There is. Then, the return air path for returning the air in the air-conditioned room is configured to be guided to the main filter 5 via the return air pre-filter 8 without passing through the return air fan, and the exhaust gas is branched from the return air path. The exhaust path passes through the partition 9, the exhaust damper 10, the total heat exchanger 7 and the exhaust fan 3, and the exhaust fan 3 exhausts the outside air to the outside. It is introduced into the outside air fan 4 from the intake 12 via the outside air pre-filter 13, the outside air introduction path is branched downstream of the outside air fan 4, passes through the outside air damper 14 via the total heat exchanger 7,
Path from compartment 9 to main filter 5 and total heat exchanger 7
To bypass the outside air total heat exchanger bypass circuit damper 15,
It is configured to be introduced into the main filter 5 from the section 9.

The operation of the air conditioner of this embodiment shown in FIG. 1 will be briefly described. The air supply to the air-conditioned room is performed from the compartment 9 through the main filter 5, the hot / cold water coil 6, and the compartment 16 to the air supply fan. After being sucked into the unit 1 and boosted in pressure, it is supplied into the air-conditioned room through the air supply duct 17.

Return air from the air-conditioned room is branched from the compartment 9 through the return air pre-filter 8 and, on the other hand, the return air is passed through the exhaust damper 10 and exhausted through the total heat exchanger 7. It is discharged from the fan 3 to the outside of the room, and the other one is in the compartment 9
After being mixed with the outside air at, the air is supplied again into the air-conditioned room through the air supply route. On the other hand, the outside air supplied as fresh air into the air-conditioned room is sucked by the outside air fan 4 from the outside air intake 12, and when the total heat exchanger 7 is used, the outside air passes through the total heat exchanger 7 to reach the outside air. After passing through the damper 14 and being mixed with the return air, it is supplied again into the air-conditioned room via the supply air path. On the other hand, when the total heat exchanger 7 is not used,
The outside air bypasses the total heat exchanger 7, passes through the outside air total heat exchanger bypass circuit damper 15, is mixed with the return air, and is then supplied again into the air-conditioned room through the supply air path.

Next, the installation location and installation method of various sensors will be described with reference to FIG.

All the sensors are installed downstream of the return air pre-filter 8 and in a compartment 20 upstream of the compartment 9 which is a mixing portion of the return air and fresh outside air. That is, the sensor bodies of all the sensors are installed in the section 20,
By extending the detection end from this section 20 to a predetermined location, the installation environment of the sensor body is made good. Section 2
In 0, the air-conditioned air is the air pre-filter 8
Since it has been filtered by, the temperature and humidity are appropriate, and there is no dust, which is an extremely good environment for sensors.

The method of installing each sensor will be described below. The temperature sensor 21 for air supply has a detection end 21 a extending from the sensor body installed in the compartment 20 to the secondary side of the cold / hot water coil 6. Further, the return air temperature sensor 22 is installed in the compartment 20 together with the sensor body and the detection end. As for the outside air temperature sensor 23, the sensor body is installed in the compartment 20 and the detection end 23a is installed upstream of the outside air pre-filter 13.

The CO ₂ sensor 24 is installed in the compartment 20,
The ambient humidity sensor 25 is also installed in the compartment 20 in the same manner. The air supply pressure sensor 26 has a sensor body installed in the compartment 20 and a detection end 26a installed in the air supply system passage.
A tube or the like is connected between them. Further, regarding the main filter differential pressure sensor 27, the return air pre-filter differential pressure sensor 28, and the outside air pre-filter differential pressure sensor 29, the sensor main body is installed in the compartment 20, and tubes are respectively connected from the sensor main body. Extend to the inlet side and the outlet side of the filter. That is, the main filter differential pressure sensor 27 has a tube extending to the inlet side and the outlet side of the main filter 5. Similarly, the return air pre-filter differential pressure sensor 28 also has a tube extending to the inlet side and the outlet side of the return air pre-filter 8. Similarly, for the differential pressure sensor 29 for the outside air prefilter, a tube is extended to the inlet side and the outlet side of the outside air prefilter 13.

As described above, according to this embodiment, the sensor bodies of all the sensors 21 to 29 are installed in the compartment 20 in an environment where humidity, temperature, dust, etc. are extremely favorable, and their detection ends are installed. Have been extended to the necessary places. As a result, the environment in which the various sensors are installed becomes extremely good, and there is no fear of malfunction of the sensors due to the environment.
Further, since the sensor bodies of all the sensors are installed in the compartment 20, maintenance is extremely easy.

[0024]

According to the present invention having the above-mentioned structure,
By installing the sensors on the downstream side of the return air pre-filter and on the upstream side of the mixing section of the return air and the fresh outside air, it is possible to install them in a location that is good for the sensor installation environment, and It does not cause malfunction due to high humidity. Further, since various sensors are installed in one place, the maintainability of the sensors is extremely good.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of an embodiment of an air conditioner according to the present invention.

FIG. 2 is an explanatory diagram showing a basic configuration of a conventional air conditioner.

[Explanation of symbols]

1 Air Supply Fan 2 Inverter 3 Exhaust Fan 4 Outside Air Fan 5 Main Filter 6 Cold / Hot Water Coil 7 Total Heat Exchanger 10 Exhaust Damper 11 Exhaust Duct 12 Outside Air Intake 14 Outside Air Damper 15 Outside Air Total Heat Exchanger Detour Damper 21 Supply Air Temperature sensor 22 Return air temperature sensor 23 Outside air temperature sensor 24 CO ₂ sensor 25 Return air humidity sensor 26 Supply air pressure sensor 27, 28, 29 Differential pressure sensor

Claims (2)

[Claims] 1. A hot / cold water coil, an air supply fan for supplying air to the room, an exhaust fan for discharging indoor air to the outside, an outside air introducing fan for introducing the outdoor air, and a return air pre-filter. An external air pre-filter and a supply air main filter, return air from the air-conditioned room passes through the return air pre-filter, and part of the return air is exhausted to the outside by the exhaust fan. , The return air is mixed with the outside air introduced by an outside air introduction fan through an outside air pre-filter, and is cooled by the cold / hot water coil during cooling, heated during heating, and air-conditioned by the air supply fan. An air conditioner for supplying air to a room, wherein sensors for controlling the air conditioner are installed on the downstream side of the return air prefilter and on the upstream side of a mixing portion of the return air and the outside air. An air conditioner characterized by . 2. The return air temperature sensor, the supply air temperature sensor, the outside air temperature sensor, the return air pre-filter clogging detection differential pressure sensor, or the outside air pre-filter clogging. A differential pressure sensor for detection, a differential pressure sensor for detecting clogging of the main air supply filter, a supply air pressure sensor, a cleanliness detection sensor for return air, or a return air humidity sensor. 1. The air conditioner according to 1.