JP2616276B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having an air blower for supplying outdoor air to a room and an exhaust air blower for discharging room air to the outside.

[0002]

2. Description of the Related Art FIGS. 1 and 2 are block diagrams of an air conditioner for treating outside air according to the prior art and the present invention.
Is an exhaust blower, 3 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 inlet, 9 is a supply air outlet, 10 is a return air inlet, Reference numeral 11 denotes an exhaust outlet, and broken lines indicate ducts installed at the time of installation at the site. Reference numeral 12 denotes an outside air duct, 13 denotes an air supply duct, 14 denotes a return air duct, and 15 denotes an exhaust duct.

In such a configuration, fresh outdoor air outside the room is sucked from the outside air inlet 8 through the outside air duct 12, dust and dust are removed by the outside air filter 6, and the indoor air is heat-exchanged by the total heat exchanger 3. After that, it is heated or cooled by the heat exchanger 4, humidified by the humidifier 5, and supplied to the room. The indoor air is sucked from the return air inlet 10 through the return air duct 14, the dust and dust are removed by the return air filter 7, the heat is exchanged with the outdoor air by the total heat exchanger 3, and then discharged outside the room. . The blower control will be described below. The supply air flow is detected by the supply air flow sensor 21, converted into an electric signal by the supply air flow detection means 23, sent to the supply air flow control means 25 a, and is sent to a certain target value (determined by the air conditioning load detection means). If the detected value is larger than the target value, the output frequency of the air blower driving means 26 is decreased, and if the detected value is smaller than the target value, the output frequency is increased. Control is performed so that the detection value is stabilized at the value.
The air blower driving means 26 comprises a converter 28a for converting AC power into DC and an inverter 28b for converting the DC power again into an AC power having a certain frequency and voltage.

Similarly, the exhaust air amount is detected by an exhaust air amount sensor 22, converted into an electric signal by an exhaust air amount detecting means 24, and sent to an exhaust air amount controlling means 25b. The output frequency is controlled by the exhaust blower driving means 27 so that the target exhaust air flow rate determined to be R matches the exhaust air flow rate detection value. The exhaust blower driving means 27 comprises the converter section 28a and an exhaust-side inverter section 28c. Both the air supply and the exhaust are performed by changing the output frequency from the inverters 28b and 28c. The air conditioning load detecting means 29
There are various types such as temperature sensor, humidity sensor Co ₂ sensor, etc.
Also, strong / weak settings using a remote controller or the like may be used. Also,
The relation between the output voltage and the output frequency of the inverter is set in advance in a fixed relation.

[0005] The relationship between the air-conditioning load and the target value of the supply / exhaust amount is, for example, in the case of temperature control, when the actual room temperature is higher than a preset temperature, or in the case of cooling, the target value is increased and heating is performed. For example, if the room temperature is lower than the set temperature, the target value decreases if the cooling is performed, and if the room temperature is heating, the target value decreases. The blower control means 25 is capable of comparing the set temperature with the room temperature and setting a target value.

FIG. 4 shows an operation flowchart. When the operation is turned on in step 30, the supply air flow rate detection value V is determined in step 31.
comparing _jS and supply air flow rate the target value V _tS, step if the same
32 to maintain the inverter frequency F _S of supply air blower in. If towards the V _jS it is less than the V _tS in step 33, to increase the inverter frequency F _s of the supply air blower at step 34,
If the case towards the V _jS is greater than V _tS at step 33 at step 36, it decreases the inverter frequency F _s of the supply air blower. Here, at the time of start-up, the air supply and exhaust both start at an inverter frequency of 0 Hz. Further, in step 37, the target exhaust air volume value _VtE is determined by the product of the supply air volume target value _VtS and the exhaust gas / air supply air volume ratio R. At this time, the exhaust / supply air volume ratio R is set in advance. In step 38, the exhaust air flow detection value _VjE
It is equal to the exhaust air volume target value V _tE, maintaining the inverter frequency F _E of the exhaust blower at step 39. If the case towards the V _jE is less than the V _tE at step 40 to increase the inverter frequency F _E at step 41, if who V _jE is greater than V _tE at step 40 decreases the inverter frequency 43 in step 43 .

[0007]

In the conventional air volume adjustment of the inverter control, the output frequency is gradually increased from 0 Hz at the time of starting. For this reason, it takes a long time to stabilize to the target air volume, and since the air volume sensor controls the air volume at the time of startup when the air volume is unstable, the air volume is difficult to stabilize, and hunting of the output frequency and the air volume occurs. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides an air conditioner that has a shorter time from startup to a time when a target air volume is reached and has no hunting of an output frequency or an air volume. For the purpose.

[0009]

An air conditioner according to the present invention.
Sum machine, air supply blower for supplying outdoor air taken from the outdoor air inlet to the interior side, an exhaust blower for discharging the indoor air taken from the chamber air inlet to the outdoor side, further the outdoor air And a total heat exchanger for performing heat exchange with the room air, an air volume sensor for detecting the supply air volume and the exhaust air volume, a preset air volume set value, and the air volume sensor. Comparison with the detected value
A blower control means for increasing or decreasing the output frequency of the blower inverter based on the comparison result, within a predetermined time from the start, regardless of the blower control based on the detection value of the air flow sensor, the air supply side, Both the exhaust-side blowers are operated at an output frequency fixed to a predetermined value relatively smaller than the rated value .

[0010]

In the air conditioner constructed as described above, an air volume sensor for detecting the air volume and the exhaust air volume, a preset air volume set value, and a detection value detected by the air volume sensor The output frequency of the blower inverter is increased or decreased based on the comparison result, and within a predetermined time from the start, the air supply side and the exhaust side are independent of the blower control based on the detection value of the air volume sensor. Both fans are controlled to operate at an output frequency fixed to a predetermined value relatively smaller than the rated value .

[0011]

【Example】

Embodiment 1 FIG. The unit configuration and the electric circuit configuration of the air conditioner are the same as those in the related art and are as shown in FIGS. Here, FIG.
The operation flowchart of FIG. When the operation ON in step 30, compares the elapsed time T _j after driving a predetermined value T ₁ of the elapsed time after the operation ON in step 45. Here, T ₁ is a value set in advance and is determined by the change speed of the inverter frequency or the like, but is usually a value of several tens seconds to several minutes. If T _j is smaller than T ₁ , the values of V _jE and V _jS , that is, the values detected by the air flow sensor are ignored in step 45, and the inverter frequency F on both the supply side and the exhaust side is ignored in step 47. _S, to secure the F _E to a predetermined value F _1. Where the value of F ₁ is usually set to a relatively small value than the rated value. If T _j is larger than T ₁ at step 45, that is, if a lapse of a predetermined time from the operation ON, the process proceeds to step 31, performs frequency control by the conventional same air volume sensor. Step 31 and subsequent steps are the same as those in the conventional example, and thus description thereof is omitted. Embodiment 2. FIG. In the first embodiment, the air flow control target value is set so that the ratio between the exhaust air flow control target value and the supply air flow control target value is constant. However, a similar effect can be obtained.

[0012]

In the air conditioner constructed as described above, an air flow sensor for detecting the supply air flow and the exhaust air flow, a preset air flow set value, and a detection by the air flow sensor. The output frequency of the blower inverter is increased or decreased based on the comparison result, and within a predetermined time from the start, regardless of the blower control based on the detected value of the air flow sensor, the air supply side is compared. Since both the exhaust side blowers are controlled so as to operate at an output frequency fixed to a predetermined value relatively smaller than the rated value, at the time of startup, instead of starting from 0 Hz, it is not necessary.
Since the blower is quickly operated at the predetermined output frequency,
As well as shortening the time from starting to reaching the target air volume,
For a predetermined period of time after startup, when operation is likely to be unstable,
Output frequency of the machine inverter is relatively lower than the rated value
Fixed to a predetermined value, so that wind
The air volume could be maintained at a constant value, and the operation of the air conditioner without hunting of the output frequency and the air volume became possible.

[Brief description of the drawings]

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

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

FIG. 3 is a flowchart relating to a blower control of the air conditioner of the present invention.

FIG. 4 is a flowchart relating to a conventional blower control of an air conditioner.

[Explanation of symbols]

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

Claims (1)

(57) [Claims] 1. A outdoor air outdoor air taken from the suction port air supply fan for supplying to the room side, an exhaust blower for discharging the indoor air taken from the chamber air inlet to the outdoor side, further the outdoor An air flow sensor for detecting the supply air flow and the exhaust air flow, having a total heat exchanger for performing heat exchange between air and the room air, a preset air flow setting value, and the air flow sensor And a blower control means for increasing or decreasing the output frequency of the blower inverter based on the comparison result, within a predetermined time from the start, based on the detected value of the air flow sensor An air conditioner characterized by operating at an output frequency fixed to a predetermined value which is relatively smaller than a rated value for both an air supply side and an exhaust side blower regardless of the blower control.