JPH0814672A - Freezer device - Google Patents

Abstract

PURPOSE:To enable a fast raising up to a set temperature to be attained and to enable an efficient operation to be carried out. CONSTITUTION:A freezer device is comprised of a surrounding air temperature sensing means 11 for use in sensing a temperature of surrounding air; a convertor 10 for changing a frequency of an invertor compressor 1; and a speed variable means for changing a varying speed of the frequency with this convertor in response to a temperature detected by the surrounding air temperature sensing means 11. In the case that the frequency of the invertor compressor is changed according to the detected surrounding air temperature, the varying speed of the frequency is made variable and a varying speed of the frequency corresponding to the surrounding air temperature is determined. With such an arrangement as above, it is possible to set rapidly and efficiently a raising speed of it up to the set temperature while preventing a high pressure cutting and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus in which an inverter compressor, a condenser, an expansion valve and an evaporator are connected in an annular shape, and more particularly to an inverter compressor of the refrigerating apparatus according to a required load. The present invention relates to a refrigerating device that changes the frequency.

[0002]

2. Description of the Related Art In an air conditioner using a refrigeration system of this type, an inverter compressor (variable capacity compressor) is used as a compressor.
A configuration is known in which the output of the compressor is changed according to the required load.

[0003] In such an air conditioner, conventionally, the rising speed is uniformly kept constant from the start of startup until the inverter compressor is raised to a predetermined output (for example, maximum output). For example, the frequency was raised up to the maximum frequency of the compressor at a rising speed of 1 Hz / 5 sec.

On the other hand, in recent air conditioners, in order to obtain better comfort, the rising temperature of the blowout temperature at startup and the time from turning on the switch until reaching the set room temperature are set. There is a strong demand for shortening, and such a demand is particularly high for heating in cold regions.

In response to such a request, Japanese Patent Publication No. 4-63
Japanese Patent Laid-Open No. 977 discloses a configuration in which the outside air temperature is detected and the operating frequency of the compressor is determined according to the outside air temperature. That is, in the air conditioner disclosed in this publication,
Comparing the outside temperature with the room temperature, if it is higher than a certain reference value, maximize the output of the compressor, and if it is lower, limit it to a frequency lower than this to ensure efficient operation of the air conditioner. I am trying.

[0006]

However, if the output of the compressor is simply determined according to the outside air temperature, efficient operation until the set temperature is reached is achieved, but the time until the operation is started up is increased. There is a problem that it costs.

In this case, it is possible to uniformly increase the frequency of the compressor so that the frequency of the compressor rises to a predetermined frequency at the highest speed of rise. When the frequency is increased, for example, when the outside air temperature is high during heating operation and the operation output of the indoor unit (operating horsepower of the indoor unit) is small, the ejection pressure of the compressor becomes abnormally high due to the delay in response in control. Therefore, there is a problem that high pressure is cut and efficient operation cannot be performed.

Therefore, it is an object of the present invention to provide a refrigerating apparatus which can quickly rise to a set temperature and can be operated efficiently.

[0009]

According to a first aspect of the present invention, in a refrigerating apparatus in which an inverter compressor, a condenser, an expansion valve and an evaporator are connected in an annular shape, an outside air temperature detecting means for detecting the outside air temperature, A converter for changing the frequency supplied to the inverter compressor and a speed changing means for changing the changing speed of the frequency by the converter based on the temperature detected by the outside air temperature detecting means are provided.

A second aspect of the present invention is, in a refrigerating apparatus in which an inverter compressor, a condenser, an expansion valve and an evaporator are connected in a ring shape, an outside air temperature detecting means for detecting an outside air temperature and an indoor load are detected. The load output detection means, a converter for changing the frequency supplied to the inverter compressor, and the frequency by the converter based on a value obtained by comparing the detection value by the outside air temperature detection means and the detection value by the load output detection means. Speed changing means for changing the changing speed of the.

[0011]

In the refrigeration system of the first aspect of the present invention, when the frequency supplied to the inverter compressor is changed according to the outside air temperature, the changing speed of the frequency is made variable, and the changing speed of the frequency according to the outside air temperature. To decide. For example, when the outside air temperature is low during heating operation, when increasing the frequency of the compressor, the speed of increase of the frequency is set to 1 Hz / 1 sec,
When the outside air temperature is high, the frequency rise rate is slowed down to 1 Hz / 30 sec. Therefore, there is little risk of high-pressure cut, and the rising speed up to the set temperature according to the outside air temperature can be increased quickly and efficiently.

In the second aspect of the present invention, the rate of change in frequency is determined by comparing the outside air temperature with the load inside the room. For example, when the outside air temperature is low during heating operation and the load on the room is large, when increasing the frequency of the compressor, the speed of increase of the frequency is increased to 1 Hz / sec, the outside air temperature is high and the indoor load is high. When is small, the frequency rising speed is slowed down to 1 Hz / 30 sec. As a result, the rising speed of the compressor is changed in consideration of not only the outside air temperature but also the indoor load. Therefore, in addition to the first aspect of the invention, more efficient operation can be performed in consideration of the indoor load. .

In the cooling operation as well, in the same manner as in the heating operation, low pressure cut and freeze prevention are achieved, and the rising to the set temperature is quick and efficient operation can be performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a heat pump type air conditioner for performing cooling and heating as an example of the refrigerating apparatus of the present invention. In the figure, reference numeral 1 is a compressor provided in an outdoor unit 2 and this compression is performed. The outdoor heat exchanger 4 via the four-way valve 3 to the machine 1
The four-way valve 3 is connected to the indoor unit 6
The indoor heat exchanger 7 is connected, and an electric expansion valve 8 is provided in the outdoor unit 2 between the indoor heat exchanger 7 and the outdoor heat exchanger 4.

As the compressor 1, an inverter compressor whose discharge capacity is variable is used, and the number is not limited to one and may be two. The discharge capacity of the inverter compressor 1 is determined by the (power) frequency supplied to the inverter compressed air 1, and this frequency receives a signal from the converter 10 to operate at a predetermined frequency. Controlled.

An accumulator 9 is provided on the suction side of the compressor 1.

The outdoor unit 2 is provided with an outside air temperature detector (outside air temperature detecting means) 11 for detecting the outdoor temperature, and the outside air temperature detector 11 sends a detection signal to the control device 13. In addition, the indoor unit 6 is provided with a load output detector 15 and an indoor temperature detector 16 that detect a load (set temperature or driving horsepower) of the indoor unit and transmit the detected load to the control device 13. The operation control is performed according to the load output of the unit 6 and the room temperature.

The load output detector 15 detects the output of the blower or the like in the indoor unit 6 and the total output of the indoor heat exchangers 7 as the load output when there are multiple indoor heat exchangers. The load due to the temperature difference may be detected.

The control device 13 determines the operating frequency of the compressor 1 by performing a predetermined calculation based on the detected value of the outside air temperature detector 11 and the operating output (operating horsepower) value of the indoor unit 2.

At the same time, in the control device 13, the speed varying means 17 determines the rising speed for increasing the frequency of the compressor 1 up to the operating frequency, and based on the rising speed,
The compressor 1 is driven via the converter 10.

Next, the operation of this embodiment will be described.

In the cooling operation, the refrigerant is discharged from the compressor 1 and flows back from the four-way valve 3 to the compressor 1 through the outdoor heat exchanger 4, the electric expansion valve 8, the indoor heat exchanger 7, and the accumulator 9. (See the broken line arrow in FIG. 1). Also,
In the heating operation, conversely, the refrigerant from the compressor 1 returns to the accumulator 9 and the compressor 1 from the indoor heat exchanger 7 via the electric expansion valve 8 to the outdoor heat exchanger 4. (See the solid line arrow in FIG. 1).

In this embodiment, the frequency control of the compressor during the heating operation will be described with reference to the control flow of FIG.

When the control operation is started, in step S1, the outside air temperature detector 11 detects the outside air temperature and issues a detection signal of the detected value to the control device 13. Then, in step S2, a detection signal of the value detected by the load output detector 15 of the indoor unit is emitted.

In step S3, the detected value from the indoor temperature detector 16 is also taken in to determine the operation output of the compressor 1, and thus the set frequency of the compressor 1 is determined.

Subsequently, in step S4, the speed varying means 17 determines the frequency increasing speed of the compressor. By determining the rate of increase of the frequency in this way, high-speed cut is prevented while the rise to the set room temperature is accelerated, and efficient and safe operation is achieved.

In determining the frequency rising speed, for example, as shown in FIG. 2, the rising speed set in several stages is selected in advance from the relationship between the operating output (driving horsepower) of the indoor unit and the outside air temperature. To do. The operation output of the indoor unit 6 may be a load required depending on the indoor installation temperature and the indoor temperature.

That is, in FIG. 2, the outdoor temperature (outside air temperature), which is the heat source temperature, is plotted on the ordinate, and the indoor load (indoor operating horsepower) is plotted on the abscissa. D
It is divided into four stages.

The indoor driving horsepower is divided into two stages, which are larger or smaller than an arbitrary horsepower, as a boundary, and the outside air temperature is similarly divided into two stages, which are larger or smaller than an arbitrary value as a boundary. It is divided into four stages A to D according to a combination of two stages of indoor driving horsepower and two stages of outside air temperature.

In this embodiment, the frequency rise rate of the compressor is 1 Hz / 30 SEC, which is the slowest and slowest in the A stage where the outside air temperature is high and the indoor load is small. 1 Hz / 15 SEC at stage B with high outside air temperature and large indoor load, low outside air temperature and small indoor load, 1 Hz at stage C with low outside air temperature and small indoor load or high outside air temperature and large indoor load / 5SEC is set to 1Hz / 1SEC at stage D when the outside air temperature is low and the indoor load is large. Therefore, the rising speed is the slowest in the A stage,
As it moves to the B and C stages, it gradually becomes slower, and the rising speed of the frequency becomes slowest at the D stage.

The reason why the plurality of stages are set is that the high frequency cut may occur when the frequency increasing rate of the compressor is increased when the outside air temperature is high. I slowed it down. On the other hand, when the outside air temperature is high, even if the frequency rising speed is slowed down, it can be easily raised to the set room temperature, and the rising characteristic is not deteriorated. Needless to say, the setting stage is not limited to four stages, and any number of stages such as five stages and six stages may be set.

On the other hand, when the outside air temperature is low, the compressor 1
Since the high-voltage cut is less likely to occur even if the rising speed of is increased, the rising speed of the frequency is increased to accelerate the rise. As a result, when the outside air temperature is low, the set room temperature can be raised in a short time, and a quick rising characteristic can be obtained.

For example, in the case of the maximum rising speed D, it takes about 1 minute from the conventional 8 to 10 minutes until the compressor reaches its maximum capacity, and the outside air temperature as a heat source temperature is low, In addition, when the indoor driving horsepower is large and the condensing temperature does not easily rise, the capacity of the compressor is quickly raised.

In step S5, the speed varying means 17 causes the converter 10 to increase the frequency at a predetermined speed based on the step of the rising speed determined in step S4. Specifically, the timer of the converter 10 is set to a predetermined value. For example, in the stage A, the frequency is increased by 1 every 30 seconds, and in the stage D, the frequency is increased by 1 every 1 second. Set and finish.

According to this embodiment, the rate of change in frequency is determined by comparing the outside air temperature with the load output in the room, so that the rising speed up to the set temperature can be made fast and efficient. . Furthermore, when the rise speed of the compressor is changed by considering not only the outside air temperature but also the load inside the room, it is necessary to quickly raise the temperature to the set room temperature by considering the indoor output and room temperature. It is possible to quickly start up and provide a comfortable air conditioner.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention.

For example, in the above-mentioned embodiment, the heating operation has been described as an example, but the present invention is not limited to this, and the same effect can be obtained in the cooling operation.

Further, the frequency of the compressor is not limited to the rising speed, and the same control may be performed at the falling speed. The same applies to the heat source water temperature in the water cooling type.

Further, the frequency rising rate may be determined in consideration of the discharge temperature of the compressor, the current value, the indoor heat exchange temperature in the indoor heat exchanger, and the like.

[0041]

According to the first aspect of the present invention, when the frequency supplied to the inverter compressor is changed according to the required load or the like, the changing speed of the frequency is made variable and the frequency is changed according to the outside air temperature. It determines the rate of change of frequency. This makes it possible to increase the rising speed up to the set temperature quickly and efficiently while preventing high pressure cut and the like.

According to the second aspect of the present invention, the rate of change of frequency is determined by comparing the outside air temperature with the indoor load.
As a result, the rising speed of the compressor is changed in consideration of not only the outside air temperature but also the output of the indoor unit.
In addition to the first aspect of the invention, a comfortable and efficient operation can be performed in consideration of the indoor output.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing steps of frequency changing speed according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a control flow of a frequency rising speed of the compressor according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 10 Converter 11 Outside air temperature detector 13 Control device 15 Load output detector (load output detecting means) 17 Speed varying means

Claims (2)

[Claims] 1. A refrigerating apparatus in which an inverter compressor, a condenser, an expansion valve and an evaporator are connected in an annular shape, and an outside air temperature detecting means for detecting an outside air temperature and a frequency supplied to the inverter compressor are changed. A converter to
A refrigeration apparatus comprising: speed changing means for changing the changing speed of the frequency by the converter based on the temperature detected by the outside air temperature detecting means. 2. A refrigeration system in which an inverter compressor, a condenser, an expansion valve and an evaporator are connected in an annular shape, and an outside air temperature detecting means for detecting an outside air temperature and a load output detecting means for detecting a load in a room. Changing the frequency change rate by the converter based on a value obtained by comparing the value detected by the outside air temperature detecting means and the value detected by the load output detecting means with a converter that changes the frequency supplied to the inverter compressor A refrigerating apparatus comprising: a speed varying unit.