JPS63207968A - Refrigerator by inverter control - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inverter-controlled refrigerator, and particularly relates to an inverter-controlled refrigerator in which the rotation speeds of both a compressor and a fan motor can be varied. .

[Prior Art] FIG. 3 is a block diagram showing the electrical configuration of a conventional inverter-controlled refrigerator disclosed in, for example, Japanese Utility Model Application Publication No. 59-86565.

In the figure, (1) is an AC power source that is the power source of the refrigerator controlled by this inverter, (2) is an inverter device that generates three-phase AC, (3) is a compressor that compresses the refrigerant in the refrigeration cycle, and (4) is A fan motor for circulating cold air in the refrigerator, (5) a control circuit for controlling the inverter device (2), and (6) a control circuit for continuously operating the compressor (3) and fan motor (4) for a predetermined period of time. A manual quick-freeze switch that sends a signal to the control circuit (5), (7) is connected to the fan motor (4
) control relay.

The electrical configuration of a conventional inverter-controlled refrigerator is:
It was as above. This operation will be explained below.

For example, when the temperature inside the refrigerator compartment, etc. exceeds the set temperature, the control circuit (5) senses this and inverts the inverter (2).
) and sends a signal to the inverter device (2) that responds to the temperature difference.
The compressor (3) is driven by the output. On the other hand, a signal is simultaneously sent from the control circuit (5) to the relay (7), which operates and also drives the fan motor (4).

These series of operations are usually automatically controlled, for example,
The output frequency of the inverter device (2) was changed according to the temperature difference between the internal temperature and the set temperature to control the rotation speed of the compressor (3).

In addition, when rapid cooling and freezing of the inside of the refrigerator is desired, the compressor (3) and fan motor (4) can be manually driven as desired without affecting the automatic control described above. . That is, when the quick-freezing switch (6) is activated, the control circuit (5) sends a signal to the inverter device (2), and the inverter device (2) outputs high-frequency three-phase alternating current to the compressor (3). ) is operated at high speed for a predetermined period of time.

At this time, since a signal is simultaneously sent from the control circuit (5) to the relay (7), the relay (7) is activated and the fan motor (4) is driven.

In this way, this type of inverter-controlled refrigerator
By automatically or manually controlling the inverter device (2) with the control circuit (5), the drive rotation speed of the compressor (3) is controlled, and the fan motor (4) is also driven at the same time.
It was designed to quickly adjust the temperature inside the refrigerator.

[Problems to be solved by the invention] In the conventional inverter-controlled refrigerator as described above,
When performing rapid cooling or freezing, the compressor (3) could be rotated at high speed to increase the cooling or freezing capacity. However, even in this case, the fan motor (4) always rotated at a constant speed. For this reason, although rapid cooling or freezing is required, the circulation speed of cold air remains constant, and it cannot be said that efficient cooling is necessarily achieved. Therefore, even if the capacity of the compression unit 41(3) and the inverter unit (2) were increased, the problem often occurred that this capacity was not utilized effectively.

In addition, as a refrigerator that can change both the rotation speed of compression @ (3) and fan motor (4),
There was also a technology described in the publication, but this was a compressor (
3) and the fan motor (4) are controlled using separate means, and a problem arises in that each requires a complicated control device such as an inverter control circuit.

Therefore, this invention was made to solve these problems, and it is possible to simultaneously control the rotation speed of the fan motor according to the refrigerating capacity of the compressor and inverter device, and to achieve efficient cooling with a simple configuration. The purpose of this invention is to obtain an inverter-controlled refrigerator that allows for

[Means for Solving the Problems] The inverter-controlled refrigerator according to the present invention controls the rotation speed of the fan motor (4) for circulating cold air inside the refrigerator by controlling the rotation speed of the inverter device (2) and the control circuit (5). It is controlled using the output.

[Function] In this invention, the rotation speed of the fan motor (4) that circulates cold air inside the refrigerator is controlled by using the output of the same inverter device (2) and control circuit (5) as the compressor (3). Since the compressor (3) and the fan motor (4) can be controlled accordingly.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of a refrigerator controlled by an inverter, which is an embodiment of the present invention. In addition, in the figure, (1) to (6) are the same or corresponding components to the components of the above-mentioned conventional example. The inverter controlled refrigerator of this invention is different from the conventional one and the fan motor (4
) The only thing that matters is the connection position and control method. Therefore, here, we will focus on the differences from conventional inverter-controlled refrigerators.

First, the operation of this embodiment will be described below.

When the internal temperature of the freezer compartment, etc. exceeds the set temperature, the control circuit (5) senses this and sends a signal to the inverter device (2), and the output of the inverter device (2) according to the temperature difference turns the compressor on. (3) starts driving. At the same time, the fan motor (4) starts to be driven using the three-phase power supply of the three-phase alternating current generated by the output of the inverter device @ (2). This fan motor (4) employs a variable rotation speed motor, and the rotation speed changes depending on the output frequency of the inverter unit (2).

Therefore, for example, if the temperature difference between the internal temperature and the set humidity is large and a signal to rotate the compressor (3) at high speed is sent from the control circuit (5) to the inverter device (2), the inverter device (2) The output frequency of the compressor (3
) is driven at high speed.

At this time, the rotation speed of the fan motor (4) is also controlled by the output of the inverter device (2), resulting in high-speed operation.

As a result, the rotation speed of the compressor (3) and the fan motor (4)
A specific relationship holds true with the rotation speed. For example, it will be approximately proportional. Conversely, if the temperature difference between the internal temperature and the set temperature is small, a signal to rotate the compressor (3) at a low speed is sent from the control circuit (5) to the inverter (2).
), the output frequency of the inverter (2) becomes low and the compressor (3) is operated at low speed. In this case as well, the rotation speed of the fan motor (4) is controlled by the output of the inverter device (2), so the rotation speed of the compressor (3) and the rotation speed of the fan motor (4) have a predetermined relationship. It will rotate at low speed.

These series of operations are usually automatically controlled, so if the capacity of the compressor (3) is increased, the cold air circulation capacity of the fan motor (4>) will also be increased. Freezing can be carried out efficiently.Also,
According to this configuration, the motor (4) and the compressor (3)
At the same time, since it operates reliably, reliability is improved, and the relay (7) used in the past is not required, reducing the number of parts and reducing the manufacturing cost.

In addition, if you want to rapidly cool and freeze the inside of the refrigerator, you can use not only the former automatic rotation control, but also the compressor (
3) and the fan motor (4) can be driven arbitrarily as in the conventional case. However, even in this case, the rotation speed of the compressor @ (3) and the rotation speed of the fan motor (4) maintain a predetermined relationship, so when the compressor (3) is operated at high speed for a predetermined period of time, the fan motor ( 4) will also be operated at high speed for the same period of time.

As described above, the inverter-controlled refrigerator of this embodiment controls the compressor (3) and fan motor (4') by automatically or manually controlling the inverter device (2) with the control circuit (5). Since the number of revolutions can be simultaneously controlled in a predetermined relationship, the temperature inside the refrigerator can be adjusted more quickly than before. Therefore, the freshness of foods that require rapid cooling and freezing can be maintained well.

Another embodiment of the invention will now be described.

FIG. 2 is a block diagram showing the electrical configuration of an inverter-controlled refrigerator according to another embodiment of the present invention.

In this embodiment, in order to further increase the cooling and freezing capacity, a fan motor (4) is added to make the number two.The rotation speed of these two fan motors (4) is also the same as in the above embodiment. Similarly, a predetermined relationship is maintained with the rotation speed of the compressor (3).Therefore, the circulation speed of cold air in the refrigerator is further increased, and by arranging an appropriate number of fan motors (4), Since cold air can be rapidly circulated throughout, it can be used for rapid cooling and freezing.

Moreover, a power saving switch may be used instead of the quick freeze switch (6). By using this power saving switch, power consumption can be saved by automatically operating at a low frequency when the amount of food stored in the refrigerator is small or when the temperature of the outside air is low such as in winter.

[Effects of the Invention] As explained above, in the inverter-controlled refrigerator of the present invention, the rotation speed of the fan motor for circulating cold air inside the refrigerator is controlled using the output of the same inverter device and control circuit as the compressor. With the simple configuration of The rotation speed of the motor is also the same! iQ control, and efficient cooling can be performed with inexpensive equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a refrigerator controlled by an inverter, which is an embodiment of the present invention, and FIG. 2 is a block diagram showing the electrical configuration of a refrigerator controlled by an inverter, which is another embodiment of the invention. Block Diagram FIG. 3 is a block diagram showing the electrical configuration of a conventional refrigerator controlled by an inverter. In the figure, 2: inverter device, 3: compressor, 4: fan motor, 5: control circuit. In addition, in the figures, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In an inverter-controlled refrigerator in which the frequency of the compressor of the refrigeration cycle is controlled by three-phase alternating current generated by an inverter device and a control circuit, the frequency of the fan motor for circulating cold air inside the refrigerator is controlled by the inverter. A refrigerator controlled by an inverter, characterized in that the refrigerator is controlled using the outputs of a device and a control circuit. (2) The inverter-controlled refrigerator according to claim 1, wherein the fan motor includes a plurality of fan motors.