JPS62129673A - Refrigerator - 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 [Technical Field of the Invention] The present invention relates to a refrigerator in which a compressor motor can be switched between being driven by a commercial power source and being driven by an output from an inverter device.

[Technical Background of the Invention] Recently, in refrigerators, there are cases in which normal refrigeration operation is performed by driving the compressor motor using a commercial power source, and cases in which quick refrigeration operation is performed by driving the compressor motor by the output of an inverter device. A device that can switch between 1nI and 1nI is now being offered. An example of this refrigerator is shown in FIG. In the same figure, 1 is single-phase 100V and the frequency is, for example, 60Hz.
2 is a commercial power source, and 2 is an inverter device, the output power frequency of which is set to, for example, 90 Hz, which is higher than that of the commercial power source. Reference numeral 3 denotes a compressor motor, and 4 a changeover switch consisting of an interlocking switch. By switching the changeover switch 4, the compressor motor 3 can be driven by the commercial power supply 1 or by the output power of the inverter device 2. I'm trying to switch it up. Reference numeral 5 denotes a switch for energizing/disconnecting the compressor motor, which is controlled to open when the temperature inside the freezing chamber falls below a predetermined value.Opening/closing this switch 5 enables normal refrigeration operation. Operation and stop of compressor motor 3 at times 1]
is designed to be controlled.

[Problems with the background art] However, in the case of a two-unit type, the compressor motor 3
When driven by the commercial power supply 1 (during normal refrigeration operation), it is uncertain whether the compressor motor 3 is energized or disconnected, so the output from the inverter device 2 When switching to power-driven operation (quick freezing operation), the following problems may occur. That is, at the time of switching, if the commercial power supply is energized to the compressor motor 3, the drive power only changes from 60 Hz of the commercial power supply 1 to 90 Hz, which is the output power frequency of the inverter device 2. However, if the compressor motor 3 is in a power-off state at the time of the switching described in 1. Since the output power frequency of 90 Hz is suddenly applied, there is a risk that the compressor motor 3 may become locked and cannot be started.Also, even if the compressor motor 3 starts, the compressor motor 3 or the inverter device 2 Since the compressor is driven rapidly by the output power frequency of the compressor, there is a risk that the refrigerating machine oil in the compressor will abnormally diffuse into the refrigerating cycle and cause the compressor to malfunction, as well as problems such as increased vibration and noise during switching. Ta.

[Object of the invention]] The present invention was made in view of the above circumstances, and its purpose is to solve the problem when switching from driving a compressor motor with a commercial power source to driving it with an output power source of an inverter device. It is an object of the present invention to provide a refrigerator that can eliminate startup failures of a compressor motor, eliminate the risk of compressor failure, and reduce vibration and noise during switching.

[Summary of the Invention] The present invention provides a compressor motor that can be switched between being driven by a commercial power source and being driven by an output power source of an inverter device. a drive control device that controls the output power frequency of the inverter device to be set lower than its steady output power frequency for a predetermined period of time from the switching point when the inverter device is switched to be driven by the inverter;
With this, when the compressor motor is driven by switching from the commercial power source to the output power source of the inverter device, the compressor motor can be smoothly started even if the compressor motor is stopped.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. First, in Fig. 1, 11 is 1-do phase 100
Commercial power supply with a frequency of, for example, 60 Hz, 12 and 13
is a bus bar connected to this commercial power supply 11. 14 is an inverter device whose input side is connected to bus bar 12.13,
The steady output power frequency of this is set to, for example, 90 Hz, which is higher than the frequency of the commercial power source 11. 15 is a switch connected to the bus bar 12 for turning on/off the compressor motor, and 16 is a compressor motor. Reference numeral 17 denotes a changeover switch consisting of an interlocking switch, which is used to close both the contacts (c-a) of one switch 17a and the other switch 17b, and to close the contacts (c-b) of each switch 17a, 17b. ) can be switched between closing both. Therefore, this changeover switch 17 is configured to switch between driving the compressor motor 16 with the commercial power supply 11 and driving with the output power of the inverter device 14. Reference numeral 18 denotes a drive control device, to which a quick freezing set signal is given based on the operation of the quick freezing start switch 19, and when the quick freezing set signal is given, the two-leg changeover switch 17 is activated. Each switch 17a, 17b of this has each contact (c-
b) Switch the compressor motor 1 to close the
6 to be driven by the output power of the inverter device 14, and for a predetermined period of time from the point of switching, the output power frequency of the inverter device 14 is set to a frequency lower than the steady output power frequency (90 Hz) of the commercial power source 11.
The frequency is controlled to be set to 60Hz, which is the same as the frequency of .

Further, in this case, the drive control device 18 is configured to receive a temperature detection signal from a temperature sensor 20 that detects the temperature of the freezer compartment, and controls the opening and closing of the switch 15 based on the temperature detection signal. It is supposed to be done.

Next, the operation of the above configuration will be described. During normal refrigeration operation, each switch 17a, 17b of the changeover switch 17 closes each contact (ca), and the compressor motor 16 is driven by the commercial power supply 11 (frequency 60H2). . In this case, the temperature inside the freezing chamber is detected by the temperature sensor 20, and the drive control device 18 controls the opening and closing of the switch 15 based on this detection signal, thereby controlling the operation and stopping of the compressor motor 16. and,
When the quick freezing start switch 19 is opened in order to start the quick freezing operation from this state, the drive control device 18 switches the changeover switch 17 to each contact point (c-b) of each switch 17a, 17b. This causes the compressor motor 1 to close.
6 is fti 2 As shown in the figure, it is driven by the output power of the inverter device 14. In FIG. 2, the case where the compressor motor 16 is driven by the commercial power supply 11 is shown by a dashed line, and the case where the compressor motor 16 is driven by the output power of the inverter device 14 is shown by a solid line. ing. Here, when the compressor motor 16 is switched to be driven by the output power of the inverter device 14 in this way, the inverter device 14
The output power frequency of the RILL is controlled by the drive control device 18 for a predetermined period of time from the switching point to 60°C, which is the same as the frequency of the commercial rill.
Hz, as shown in FIG.
The output power frequency of the inverter device 14 is driven at 60 Hz for a predetermined period of time, and after that time t2, the output power frequency of the inverter device 14 is 90 Hz.
Driven at 0Hz.

By the way, the compressor motor 16 is connected to the inverter device 1.
For example, if the switch 15 is opened and the compressor motor 16 is stopped at a time to before the switching time t1, when the compressor motor 16 is switched to be driven by the output power source of the compressor motor 3.
However, in this embodiment, the compressor motor 16 in the stopped state is supplied with the commercial power supply frequency of 90 Hz, which is lower than the steady output power frequency (90 Hz) of the inverter device 14.
Since only 60Hz, which is the same as the frequency of Since there is no abnormal diffusion, it is possible to prevent the occurrence of compressor failure, and also to eliminate vibration and noise during switching.

Note that the present invention is not limited to the embodiments described in -, and for example, when the compressor motor 16 is switched from being driven by the commercial power supply 11 to being driven by the output power of the inverter device 14, the output power of the inverter device 14 The frequency may be increased stepwise from a frequency set lower than the steady output power frequency to the steady output power frequency.

Further, FIG. 3 shows a different embodiment of the present invention, in which the drive control device 18 includes temperature detection from a temperature sensor 21 that detects the temperature of the compressor (compressor motor 16 in the figure). A signal is provided, thereby causing the compressor motor 16 to be connected to the inverter device 1.
When the compressor reaches a predetermined temperature or higher while being driven by the output power source 4, the drive control device 18
The output power frequency of the inverter device 14 is set to the steady 9
It may be possible to prevent the compressor from rising to an abnormal temperature by lowering the frequency from 0 Hz to a lower frequency, for example 60 Hz.

[Effects of the Invention] As is clear from the following description, the present invention enables the compressor motor to be switched between being driven by a commercial power source and being driven by an output power source of an inverter device. , when the compressor motor is switched to be driven by the output power source of the inverter device, the output power frequency of the inverter device is controlled to be set lower than the steady output power frequency for a predetermined time from the switching point. A drive control device is provided, and with this, when the compressor motor is switched from commercial power to the output power of the inverter device and driven, the compressor motor can be started smoothly even if the compressor motor is stopped. This has the excellent effect of eliminating startup failures, eliminating the occurrence of compressor failure, and reducing vibration and noise during switching.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is an electric circuit diagram, FIG. 2 is a frequency change characteristic diagram, and FIG. 3 is a partial electric circuit diagram showing a different embodiment of the present invention. It is a circuit diagram. FIG. 4 is an electric circuit diagram showing a conventional example. In the figure, 11 is a commercial power source, 14 is an inverter device, 16 is a compressor motor, 17 is a changeover switch, and 18 is a drive control device. Applicant Toshiba Corporation Figure 2 Figure 4

Claims (1)

[Claims] 1. In a compressor motor that can be switched between being driven by a commercial power source and being driven by an output power source of an inverter device, the compressor motor is driven by the output power source of the inverter device. 1. A refrigerator comprising a drive control device configured to control the output power frequency of the inverter device to be lower than its steady output power frequency for a predetermined period of time from the time of switching.