JPH02133747A - Air conditioning plant - Google Patents

Abstract

PURPOSE:To reduce the noises, such as the noise of refrigerant, and enhance the comfortableness of air conditioning by setting a limit to the maximum value of the operative frequency of the compressor according to the air flow set for an indoor fan. CONSTITUTION:A controlling device 5 comprises a temperature difference-detecting means 5a which finds a temperature difference from an indoor temperature sensor 2 and an indoor temperature setting 3a, a temperature difference-frequency altering means 5c which converts the output frequency to what corresponds to the temperature difference from the temperature difference-detecting means 5a, and a variable frequency range-setting means 5b for limiting the maximum value of the operative frequency of a compressor 11 according to an air flow set by an air flow-switching setting 3b in a remote control 3. The air flow-switching setting 3b in the remote control 3 outputs an air flow set for an indoor fan motor 7 to a fan revolution-controlling means 6 which controls the number of revolutions of an indoor fan motor 7. The controlling device 5 sets a limit to the capacity of the compressor 11 and runs the compressor 11 by controlling an inverter 10. Since thus the operative frequency of the compressor 11 is set at an optimal operative frequency according to the operating condition of the indoor fan motor 7, the noises, such as the noise of refrigerant, can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a novel air conditioner, and particularly to an air conditioner that limits the maximum operating frequency of a compressor.

(Prior Art) In an air conditioner, a compressor is driven by an inverter, and the inverter frequency is changed based on the temperature difference between a set room temperature and the room temperature, and the capacity of the compressor is operated according to the air conditioning load.

On the other hand, in this air conditioner, the air volume is set using a remote control or the like, and the indoor ventilation fan is driven by the set air volume. This is done regardless of the airflow settings, so for example, if the air volume or speed is set to low and the air conditioner is operated when there is a large difference between the set temperature and the room temperature, the air will be emitted when refrigerant flows through the pipes of the indoor heat exchanger. It becomes easier to hear the so-called refrigerant noise (sounds like hissing or whistling). In other words, dirt has a high compression capacity and a high refrigerant flow rate, and the indoor fan motor operates at a low speed and the blowing noise is low, making the refrigerant sound easy to hear. This was done in consideration of the above circumstances, and by limiting the maximum operating frequency of the compressor according to the top volume setting of the indoor fan, it is possible to reduce noise such as refrigerant noise and provide comfortable air conditioning. Our goal is to provide the best air conditioners possible.

[Configuration of the Invention (Means for Solving the Problems) As a means to solve the above problems, the present invention provides an inverter section that switches the capacity of the compressor, and a compression capacity that changes depending on the difference between the set temperature and the room temperature. In an air conditioner, the air conditioner is equipped with a frequency changing means for outputting a driving command frequency to an inverter section, and a rotation speed control means for controlling the rotation speed of an indoor fan motor according to the air volume switching setting. The frequency changing means is equipped with a frequency variable [1] stage setting stage for limiting the maximum operating frequency of the compressor according to the air volume.

(Function) According to the description, during cooling operation, depending on the air volume setting, for example, when the air volume is small, the maximum operating capacity of the compressor is limited, making it difficult to hear the refrigerant sound.

(Embodiment) Next, an outline of an embodiment of the present invention will be explained based on the block diagram of FIG. 1.9 In FIG. A room temperature sensor 2 for detecting the room temperature is connected to the control device 5, and various operating information from a remote control 3 for setting room temperature settings 3a, air volume switching settings 3b, etc. is transmitted and received by infrared rays or the like. It has become. The control device 5 also controls the air volume switching setting 3b of the remote controller 3.
”(-The setting (for example, strong wind, weak wind, slight wind) outputs the screen setting to the fan rotation speed control means 6 that controls the rotation speed of the indoor fan motor 7. The outdoor side 12 is provided with a compressor 11 and an inverter section 1° that drives the compressor 11 with variable capacity, and a control device 5 outputs an operation command frequency to the inverter section 1o. , a temperature difference detection means 5a for detecting a temperature difference from the room temperature sensor 2 and the room temperature setting 3a, and a temperature difference-frequency changing means 5c for converting the temperature difference between the temperature difference detection means 5a into an output frequency corresponding to the temperature difference. 71 Scenery switching setting 3 of the mo-controller 3. Slanted frequency variable IJ setting means 5 for limiting the maximum operating frequency value of the compressor 1-1 according to the set air volume from b.
It consists of b. The temperature difference-frequency changing means 5c detects whether the operating frequency determined from the temperature difference between the temperature difference detecting means 5a is within the range of the frequency variable setting means 5b, and if it is within the range of the setting means 51), An operation command frequency value corresponding to the temperature difference is output to the inverter unit 10, and when the frequency value based on the temperature difference exceeds the maximum frequency value set by the setting means 5b, the maximum frequency value limited by the setting means 5b is output. is output to the inverter section 1o.

Next, the determination of the operating frequency of the inverter section 1o by the control device 5 will be explained in detail with reference to FIG.

First, the temperature difference-frequency changing means 5c detects the temperature difference between the set temperature and the room temperature in 0.5°C increments, and when the difference is from 0.5 to 245°C, the operating frequency is changed to 30°C. -80Hz)
In the range 1011 z increments (1 to change the frequency 9 On the other hand, frequency variable rl J setting f stage 5b!, imaginary, air volume is "copy"
If it is set to , it will be in the range of 30 to 5011 Hz, if it is set to 1, it will be in the range of 30 to 70 Hz, and if it is set to 1, it will be in the range of 30 to 70 Hz.
For example, if the indoor fan motor 7 is controlled by the air volume switching setting 3b of the remote controller 3, the indoor fan motor 7 is outputted to the changing means 5c so as to be operated in the range of 0.-80Hz. When operating the fan motor 7, the operating frequency is limited to a maximum of 50 Hz, and when operating the indoor fan motor 7 in a weak wind, the operating frequency is limited to a maximum of 701 Hz.
1z, and when operating the indoor fan motor 7 in strong wind, its operating frequency is limited to 8011z.
limited to.

3 and 5 do not show the frequency analysis of the noise level in the present invention and the conventional example.9 In the present invention, as shown in FIG.
Compared to the figure, it can be seen that there is a large difference in the noise level at 250 Kano 1 or higher. That is, in the present invention, there is almost no noise level above 3000 Hz, but in the conventional example, the noise level is 250 Hz or higher.
There is a peak around 0Hz, but the noise level is 3000~4
92 things that cause high noise even at 500Hz 4j
: At 2500 tl z, the noise that contributes to the high 11z range above I is mainly refrigerant sound, and 1. From the second point, it can be seen that the present invention can reduce refrigerant noise. .

FIG. 4 shows a concrete block diagram of this embodiment.
Components explained in the above embodiment are given the same reference numerals and detailed explanations will be omitted.

On the indoor side 1, a light receiving section 4 is configured to detect an infrared signal emitted from the remote control 3, and the light receiving section 4 and 1
- The above-mentioned infrared detector is used.

The infrared signal detected by the light receiving section 11 is converted from an infrared signal to an electric signal by a photoelectric conversion section (not shown).

Reference numeral 15 denotes a control means for the outdoor side 12 of the air conditioner. The function of transmitting to the compression function force limiting means 5, H2 set lf! There is a function to delay the restart of the i11, a quick heating function based on the heat exchange temperature sensor on the outdoor side 12, etc.

16Lj inverter drive circuit, this drive circuit 16 receives the operation command 200 from the compression function force control means 5 from the control means 1.
5, the inverter drive circuit 16 operates according to a control command from the control means 15, and the inverter drive circuit 16 outputs a drive signal that turns on the one transistor of the inverter unit 10.

In the inverter section 10, the compression function force limiting means 8
The inverter drive circuit 16 is operated by the control command from the control means 15 based on the operation command from the drive circuit #116, and the inverter section 10 is controlled by the drive output of the drive circuit #116, and the compressor 11 is operated.

In the embodiment described above, the inverter unit 10 is controlled by limiting the compressor capacity of the compressor 11 by the control means 5, and the compressor 11 is operated.

C'' in the air conditioner of this embodiment, the compressor 11
By setting the operating frequency of 1 to the optimum operating frequency,
Depending on the operating status of the indoor fan motor 7.

Therefore, in this air conditioner, even if the vibration noise of the compressor 11 is transmitted to the indoor heat exchanger (not shown) through the piping, noise such as refrigerant noise is reduced. To provide an air conditioner that performs comfortable air conditioning by reducing the difference between refrigerant noise and fan blowing noise, thereby reducing harsh noise.

In addition, in this air conditioner, when the indoor fan motor 7 is operated at low speed with a light breeze during cooling, the operating frequency of the compressor 11 during the breeze operation is limited by the temperature difference frequency conversion means 5c of the control means 8. 2, the vibration noise of the compressor 11 and the sound emitted by the inverter section 10 (chiro-1 flapping sound) are simultaneously reduced, and no harsh noise is generated9.
[Effects of the Invention] As described in section 1, the present invention provides an air conditioner that can reduce refrigerant noise and provide a comfortable cavity by limiting the maximum operating capacity of the compressor using the control means according to the set air volume. Can do 5

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the operating frequency of the compressor and the temperature difference between room temperature and indoor set temperature, and Fig. 3 is a refrigerant in such an air conditioner. A characteristic diagram showing the relationship between sound and operating frequency, FIG. 4 is a specific block diagram of an embodiment of the present invention, and FIG. 5 is a characteristic diagram showing the relationship between refrigerant sound and operating frequency in a conventional inverter type air conditioner. It is a diagram.

Claims (1)

[Claims] 1. An inverter section that switches the capacity of the compressor, a frequency change means that outputs a driving command frequency to the inverter section in order to adjust the compression capacity according to the difference between the set temperature and the room temperature, and a frequency change means that outputs an operation command frequency to the inverter section to adjust the compression capacity according to the difference between the set temperature and the room temperature. The air conditioner is equipped with a rotation speed control means for controlling the rotation speed, and the frequency change means is provided with a frequency variable width setting means for limiting the maximum operating frequency of the compressor according to the air volume in the air volume switching setting. An air conditioner featuring: