JPH04350443A - Air conditioner - Google Patents

Abstract

PURPOSE:To control air quantity extending over a wide range by using output frequency multiplied to an air-quantity desired value out of an air-quantity detection range as the ratio of output frequency stored at the time of preceding air-quantity stabilizing to the air-quantity desired value when the air-quantity desired value is out of the air-quantity detection range. CONSTITUTION:An air-supply air blower 1 supplies the indoor side with outdoor air, and the supply air is heated and cooled by a heat exchanger 4. An exhaust blower 2 discharges indoor air to outdoors, and these outdoor air and the indoor air are heat-exchanged by a total heat exchanger 3. Air-supply quantity and exhaust quantity are detected by each air-quantity sensor 21, 22 respectively, and each air blower 1, 2 is driven and controlled by each control means 25a, 25b on the basis of the result of the comparison of these detecting values and a desired value. In this constitution, when the air-quantity desired value is out of the air-quantity detecting ranges of each air-quantity sensor 21, 22, the ratio of output frequency stored at the time of preceding stable air-quantity operation to the air-quantity desired value is set as output frequency multiplies to the air-quantity desired value out of the air-quantity detecting range.

Description

Detailed Description of the Invention [0001] [Industrial Application Field] This invention relates to an air conditioner having a supply air blower that supplies outdoor air into a room and an exhaust blower that exhausts indoor air to the outdoors. . [0002] FIG. 4 is a block diagram of, for example, a conventional air conditioner for processing outside air, in which 1 is a supply air blower, 2 is an exhaust blower, and 3 is a block diagram of a conventional air conditioner for processing outside air.
is a total heat exchanger, 4 is a heat exchanger, 6 is an outside air filter,
7 is a return air filter, 8 is an outside air intake, 9 is a supply air outlet, 10 is a return air intake, 11 is an exhaust outlet, and the dashed line indicates the duct installed at the site during installation. , 12
is an outside air duct, 13 is a supply air duct, 14 is a return air duct,
15 is an exhaust duct. In such a configuration, fresh outdoor air is sucked in from the outside air intake port 8 through the outside air duct 12, dirt and dust are removed by the outside air filter 6, and heat exchanged with indoor air by the total heat exchanger 3. After that, it is heated or cooled by a heat exchanger 4, humidified by a humidifier 5, and then supplied into the room. Also, indoor air is sucked in from the return air intake 10 through the return air duct 14, removes dirt and dust with the return air filter 7, exchanges heat with outdoor air in the total heat exchanger 3, and then is discharged outside. . At this time, as shown in the electrical circuit diagram of FIG. 5, both the supply air blower 1 and the exhaust air blower 2 are connected to
There are only two patterns: full speed/stop, and during operation, there is only full speed operation, and the air volume is adjusted by the supply air volume adjustment device 16 and the exhaust air volume adjustment device 17. Since the configurations of the supply air volume adjustment device 16 and the exhaust air volume adjustment device 17 are similar, the exhaust air volume adjustment device 17 will be explained as an example. In FIG. 6, vanes 17a and 17b that are slidable inside the exhaust outlet 11 are attached to thumbscrews 18a and 1.
8b and nuts 19a, 19b to be fixed on the outer frame 20 of the air conditioner,
At the time of installation, calculate the pressure loss etc. of the duct and install the vane 1.
The interval between 7a and 17b (actual opening size) is set. In other words, when a small amount of air is required, the interval between the vanes 17a and 17b is set narrow, and when a large amount of air is required, the interval is set wide. [0004] Problems to be Solved by the Invention [0004] Since the conventional air volume adjustment device is constructed as described above, the duct pressure loss must be calculated at the time of installation, and then the vane spacing must be set, which requires a lot of time and effort. In addition, if the calculation or settings are incorrect, there is a problem that the air volume may be too large or too low. Furthermore, once the initial settings are made, the air volume cannot be changed during operation, and there are only two patterns: a certain rated air volume or shutdown, which not only makes it impossible to respond to air conditioning loads, but also makes it impossible to adjust the air volume after setting. Therefore, when the filter becomes clogged, there is a problem that the air volume decreases. [0005] This invention was made to solve the above-mentioned problems, and it eliminates the need for the initial adjustment of the air volume using the vane, etc., and also enables the air volume sensor to detect changes in air conditioning load and air volume. The purpose is to obtain an air conditioner capable of controlling air volume over a wide range, including areas outside the range. [Means for Solving the Problems] A supply air blower for supplying outdoor air taken in from an outdoor air intake port to the indoor side, and heating and cooling the supply air supplied by the supply air blower. an exhaust blower for discharging the indoor air taken in from the indoor air intake port to the outdoor side, and a total heat exchanger for exchanging heat between the outdoor air and the indoor air, The air volume sensor for detecting the supply air volume and the exhaust air volume compares a preset air volume target value with the detection value detected by the air volume sensor, and based on the comparison result, the output of the blower inverter is adjusted. and a blower control means for increasing/decreasing the frequency, the target air volume value is
If the airflow is outside the airflow detection range of the airflow sensor, the output frequency is calculated by multiplying the airflow target value outside the airflow detection range by the ratio (ratio) between the output frequency and the airflow target value stored when the airflow was stabilized last time. It is something to do. [Operation] In the air conditioner configured as described above, an air volume sensor for detecting the supply air volume and the exhaust air volume, a preset air volume target value, and the air volume sensor are used to detect the supply air volume and the exhaust air volume. Compare the detected value and increase or decrease the output frequency of the blower inverter based on the comparison result.
When the air volume target value falls outside the air volume detection range of the air volume sensor, the ratio between the output frequency and the air volume target value stored when the air volume was stabilized last time ( The output frequency is controlled such that the output frequency is multiplied by the air volume target value outside the air volume detection range. [Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 4, 6 to 15, and 20 are as explained in FIG. 4, and FIG. 2 is a schematic electrical circuit diagram in this embodiment. 1 and 2, the supply air volume is detected by the supply air volume sensor 21, converted into an electrical signal by the supply air volume detection means 23, and sent to the supply air volume control means 25a, where it is set to a certain air volume target. value (set according to the air conditioning load determined by the air conditioning load detection means), and if the detected value is larger than the target value, the output frequency of the supply air blower drive means 26 is decreased, and conversely, if the detected value is smaller than the target value, the Control is performed so that the detected value is stabilized at the target value by increasing the output frequency. This air supply blower driving means 26 is comprised of a converter 28a that converts AC power into DC power and an inverter section 28b that converts the DC power supply back into AC power having a certain frequency and voltage. Similarly, the exhaust air volume is detected by the exhaust air volume sensor 22, converted into an electrical signal by the exhaust air volume detection means 24, and sent to the exhaust air volume control means 25b, where the exhaust air volume is determined at a fixed ratio with respect to the target supply air volume. The output frequency is controlled by the exhaust blower driving means 27 so that the target exhaust air volume determined to be R matches the detected exhaust air volume value. The exhaust blower driving means 27 includes the converter section 28a.
and an inverter section 28c on the exhaust side. Further, the blower control means 25 includes air supply and exhaust air volume control means 25a and 25b. The amount of air blown for both supply and exhaust air is controlled by changing the output frequency from the inverter sections 28b and 28c. The air conditioning load detection means 29 includes a temperature sensor, a humidity sensor, and a CO2
There are various types of sensors, etc., and strong/weak settings may be made using a remote control or the like. Further, the relationship between the output voltage and the output frequency of the inverter is set in advance to be a constant relationship. FIG. 3 shows an operational flowchart. When the operation is turned on in step 30, the detected supply air volume Vjs and the target supply air volume Vts are compared in step 31, and if they are the same, the inverter output frequency Fs of the supply air blower is maintained in step 32, and the The supply-side output frequency Fso at a stable time is stored as the supply-side output frequency Fs at that time, and the supply-side target air volume Vtso at a stable time is stored as the supply-side target air volume Vts at that time.If Vts
is within the detectable range of the airflow sensor, step 35
Vts and Vjs are compared, and if Vjs is smaller than Vts, Fs is increased in step 36, and Vjs
If is larger than Vts, Fs is decreased in step 37. However, if Vts is outside the detectable range of the airflow sensor in step 34, the output frequency is determined as follows in step 38: FS = FSO/VtSO
is determined by the product of the target air volume Vts on the supply side and the exhaust/supply air volume ratio R. At this time, R is a preset value. In step 40, the exhaust air volume target value VtE and the exhaust air volume detection value VjE are compared, and if they are the same, the inverter output frequency FE of the exhaust blower is maintained in step 41, and in step 42, the exhaust side output frequency FEO in a stable state is set to the exhaust air volume at that time. The target air volume VtE on the exhaust side when stable is set to the side output frequency FE.
o is stored as the exhaust side target air volume VtE at that time. If VtE is within the detectable range of the airflow sensor in step 43, VjE and VtE are compared in step 44, and if VjE is smaller than VtE, FE is increased, and if it is larger, FE is decreased. However, if in step 43 VtE is outside the detectable range of the airflow sensor, then in step 47 the output frequency is determined as FE = FEO/VtEO x VtE. [0012] The relationship between the air conditioning load and the target value of supply/exhaust volume is, for example, in the case of temperature control, when the actual room temperature is higher than the preset set temperature, the target value increases for cooling, and the target value increases for heating. If the room temperature is lower than the set temperature, the target value decreases for cooling, and the target value increases for heating. The blower control means 25 is capable of comparing the set temperature with the room temperature and setting a target value. In this embodiment, the air volume control target value is set so that the ratio between the exhaust air volume control target value and the supply air volume control target value is constant. You can get the same effect with anything. [0013] As described above, the air conditioner according to the present invention includes an air volume sensor for detecting supply air volume and exhaust air volume, a preset air volume target value, and the air volume sensor. A blower control means that compares the detected value with the detected value and increases or decreases the output frequency of the blower inverter based on the comparison result, when the target air volume value is outside the air volume detection range of the air volume sensor. is not a comparative control using the air volume target value and the air volume sensor detection value, but the ratio (ratio) between the output frequency and the air volume target value stored when the air volume was stabilized last time.
Since the output frequency is set to be multiplied by the air volume target value outside the air volume detection range, it is possible to control the air volume over a wide range beyond the detectable range of the air volume sensor. This eliminates the need to calculate duct pressure loss or initialize air volume during installation, and allows for detailed response to air conditioning loads.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an electrical circuit diagram showing the configuration of a blower control system of the air conditioner shown in FIG. 1;

FIG. 3 is a flowchart regarding blower control of the air conditioner shown in FIG. 1;

FIG. 4 is an overall configuration diagram of a conventional air conditioner.

FIG. 5 is an electrical circuit diagram of the air conditioner shown in FIG. 4.

6 is a detailed diagram of the air volume adjustment device of the air conditioner shown in FIG. 4. FIG.

[Explanation of symbols]

1 Air supply blower 2 Exhaust blower 3 Total heat exchanger 4 Heat exchanger 21, 22 Air volume sensor 25 Blower control means 25a Supply air flow control means 25b Exhaust air volume control means 29 Air conditioning load detection means

Claims (1)

[Claims] [Claim 1] A supply air blower for supplying outdoor air taken in from an outdoor air intake port to the indoor side, a heat exchanger for heating and cooling the supply air supplied by the supply air blower, and an indoor It has an exhaust blower for discharging the indoor air taken in from the air suction port to the outdoor side, and a total heat exchanger for exchanging heat between the outdoor air and the indoor air. an airflow sensor for detecting airflow; a blower control means that compares a preset airflow target value with a detected value detected by the airflow sensor; and increases or decreases the output frequency of the blower inverter based on the comparison result; If the air volume target value is outside the air volume detection range of the air volume sensor, the ratio (ratio) between the output frequency and the air volume target value stored when the air volume was stabilized last time is set to the air volume detection range. An air conditioner characterized in that the output frequency is multiplied by an external air volume target value.