JP5914899B1 - Simple inverter control type refrigerator, inverter control unit for refrigerator, and inverter compressor using the same - Google Patents

Abstract

A constant-speed refrigerator is made a simple inverter-controlled refrigerator. A constant speed main body control unit 12 capable of driving a constant speed compressor by turning on / off a power source by a temperature detecting means 17, and an inverter control unit 14 operated by power on / off of the constant speed main body control unit; And a variable speed compressor 8 controlled based on the output from the inverter control unit, and the inverter control unit sets the rotation speed based on the ON / OFF signal of the constant speed compressor from the constant speed main body control unit. Thus, the variable speed compressor is driven. As a result, the constant-speed refrigerator can be simply converted into an inverter by simply incorporating the inverter control unit and the variable-speed compressor into the constant-speed refrigerator having the constant-speed main body control unit that controls the constant-speed compressor on / off with the temperature detection means. It can be set as a control type refrigerator, and it can be easily set as an inverter control type refrigerator without any trouble on the refrigerator manufacturer side. [Selection] Figure 4

Description

  The present invention relates to a simple inverter control type refrigerator, an inverter control unit for a refrigerator, and an inverter compressor using the same.

  Generally, refrigerators are roughly classified into two types: a constant-speed refrigerator that cools by turning on / off the compressor and an inverter-controlled refrigerator that cools the compressor at a variable speed by an inverter. Under these circumstances, today, where energy saving is strongly demanded, inverter-controlled refrigerators are mainstream, but constant-speed refrigerators that can be provided at low cost are also in strong demand in some countries. There is.

  However, even in such countries where the demand for constant-speed refrigerators is high, the demand for inverter-controlled refrigerators with high energy saving is gradually increasing due to the growing awareness of power saving.

  This inverter-controlled refrigerator has a considerably higher price than a constant-speed refrigerator, and its spread depends on how inexpensive it can be provided. Furthermore, it depends on how quickly an inverter-controlled refrigerator can be provided in response to demand conditions.

  Therefore, the applicant has been studying a method of using a constant-speed refrigerator as a simple inverter-controlled refrigerator.

  As similar to this idea, the applicant has already replaced the inverter by replacing the main body control unit of the constant speed refrigerator with an inverter control unit capable of variable speed control by inputting only the temperature signal from the thermistor. It has been proposed to use a controlled refrigerator (see, for example, Patent Document 1).

  FIG. 13 shows the refrigerator described in Patent Document 1, wherein 101 is a main body control unit, and this main body control unit 101 inputs a temperature signal from a thermistor 103 provided in the storage 102 and based on this temperature signal. The inverter control unit variably controls the rotation speed of the compressor 104 based on the on / off time, the operation rate calculated from the on / off time, or the temperature change. The inverter main body control unit 101 (hereinafter referred to as an inverter main body control unit) controls each component such as the cooling air fan 105 and the condensing fan 106 together with the compressor 104.

  The conventional inverter-controlled refrigerator configured as described above receives a temperature signal from the thermistor 103 in place of the constant speed main body control unit that controls on / off of the compressor and the cooling fan by a thermostat or the like. By providing the inverter main body control unit 101 capable of variable speed control, an inverter control type refrigerator can be obtained.

JP 2000-356447 A

  According to the refrigerator described in Patent Document 1, a complicated electronic circuit for processing the operation status of the refrigeration system is not necessary, and there is an advantage that it can be provided at low cost while being an inverter-controlled refrigerator.

  However, in the configuration described in Patent Document 1, the inverter main body control unit 101 that variably controls the rotation speed of the compressor by the temperature signal from the thermistor is newly developed as the main body control unit of the refrigerator when the inverter control type refrigerator is used. The work of designing and attaching this as a main body control part to a refrigerator main body occurs. That is, on the refrigerator manufacturer side, a huge amount of man-hours for inverter main body control development and complicated assembly man-hours such as main body control unit installation occur, which is troublesome, and the inverter control type refrigerator can be quickly and quickly There was a problem that it could not be provided.

  In particular, for the assembly, the inverter main body control unit 101 and the thermistor 103 are newly installed and connected with lead wires, and the inverter main body control unit 101 is also connected to each component such as the cooling fan 105 and the condensation fan 106. The refrigerator manufacturer needs a lot of man-hours, and the refrigerator manufacturer cannot easily manufacture an inverter-controlled refrigerator. In order to be able to supply, there were many problems to be solved.

  Moreover, even if it is set as an inverter control type refrigerator in this way, although the rotation speed from which the efficiency becomes the best differs for every compression capacity, for example, patent document 1 is an inverter based on a thermistor output. There are cases where the set rotational speed is not necessarily the rotational speed that makes the best use of the efficiency of the compressor, and there is a problem that the merit of energy saving due to the inverter can not be fully utilized.

  The present invention was made in view of such a new problem of supplying an inverter-controlled refrigerator as needed, and a simple inverter-controlled refrigerator that can be easily used as an inverter-controlled refrigerator without taking time and effort. And it aims at provision of the inverter control unit for refrigerators, and an inverter compressor using the same.

In order to achieve the above object, the present invention provides a constant speed main body control unit capable of driving a constant speed compressor by turning on / off the power by temperature detecting means, and the constant speed main body control unit connected to the constant speed main body control unit. An inverter control unit that operates based on power on / off of a part, and a variable speed compressor that is connected to the inverter control unit and controlled based on an output from the inverter control unit, the inverter control unit comprising: A rotation speed setting section that operates based on power on / off of the constant speed main body control section and sets the rotation speed of the variable speed compressor, and the variable speed compressor at the rotation speed set by the rotation speed setting section An inverter drive circuit unit for driving the motor, and setting the number of revolutions in the revolution number setting unit in conjunction with power on / off of the constant speed main body control unit, Ri and configured to drive the variable speed compressor, the inverter
The control unit further includes an operation rate calculation unit that calculates an operation rate from the time when the constant speed main body control unit is turned on and off based on the power on / off, and the rotation speed setting unit is configured to calculate the operation rate. determined operation ratio in parts are are a structure for setting the rotational speed to fall within a predetermined.

The inverter control unit for the refrigerator includes a power on / off detection circuit, a rotation speed setting unit configured to set the rotation speed based on a power on / off signal from the power on / off detection circuit, and the rotation And an inverter drive circuit unit that drives the variable speed compressor at the number of revolutions set by the number setting unit, which are configured as one unit , based on the power on / off signal from the power on / off detection circuit further comprising a driving rate calculation unit for calculating a driving factor, rotation speed setting unit, are a configuration in which the operation rate determined by the operation rate calculating unit sets the rotational speed to fall within a predetermined.

  Furthermore, the inverter compressor has a configuration in which the inverter control unit is integrated with a variable speed compressor.

As a result, the constant-speed refrigerator can be simplified simply by incorporating the inverter control unit and variable-speed compressor into the constant-speed refrigerator having a constant-speed main body control unit that controls the constant-speed compressor on / off using temperature detection means. The inverter control type refrigerator can be used, and in that case, it is not necessary to replace the main body control unit with the inverter control unit on the refrigerator main body side, and the refrigerator manufacturer side does not need to take troublesome trouble. A refrigerator can be provided. That is, on the refrigerator manufacturer side, an inverter control unit and a variable speed compressor configured with the rotation speed setting unit and the inverter drive circuit unit as one unit, or an inverter compressor that combines these as an integral part, are used as parts. A simple inverter control type refrigerator can be obtained simply by incorporating it, and the simple inverter control type refrigerator can be provided easily and promptly according to the demand situation.
In addition, this reduces the rotational speed when the operating rate is lower than the predetermined operating rate, and conversely increases the rotational speed when the operating rate is higher than the predetermined operating rate. As a refrigerator, inverter control is performed within the operating rate range with the highest system efficiency. Since the unit controls the rotation speed of the compressor, a simple inverter-controlled refrigerator with high energy savings can be obtained.

According to the present invention, an inverter-controlled refrigerator can be easily manufactured with the above-described configuration, and a simple inverter-controlled refrigerator that can be manufactured quickly and at any time according to the demand situation can be provided.
In addition, this reduces the rotational speed when the operating rate is lower than the predetermined operating rate, and conversely increases the rotational speed when the operating rate is higher than the predetermined operating rate. As a refrigerator, inverter control is performed within the operating rate range with the highest system efficiency. Since the unit controls the rotation speed of the compressor, a simple inverter-controlled refrigerator with high energy savings can be obtained.

Sectional drawing of the simple inverter control type refrigerator in Embodiment 1 of this invention Rear view of the simplified inverter-controlled refrigerator Side view of the inverter compressor incorporated in the simple inverter-controlled refrigerator Block diagram showing the overall control configuration of the simple inverter-controlled refrigerator Main block diagram showing the circuit configuration around the inverter control unit of the simplified inverter control type refrigerator Control flow diagram of the simple inverter-controlled refrigerator Rotation speed determination flowchart showing operation rate and rotation speed determination operation of the simple inverter control type refrigerator Explanatory drawing which shows an example of the operation timing in the rotation speed control of the same simple inverter control type refrigerator Rotation speed determination flowchart showing the operation rate and rotation speed determination operation of the simple inverter control type refrigerator in Embodiment 2 of the present invention Characteristic diagram showing the relationship between the operating rate and compressor rotation speed of the simplified inverter-controlled refrigerator and refrigerator power consumption Characteristic chart showing the relationship between the efficiency and the rotational speed of the variable speed compressor used in the simple inverter controlled refrigerator Rear view showing a modification of the simple inverter-controlled refrigerator Block diagram showing the overall control configuration of a conventional low-speed refrigerator

According to a first aspect of the present invention, there is provided a constant speed main body control unit capable of driving a constant speed compressor by power on / off by a temperature detection means, and a power on / off of the constant speed main body control unit connected to the constant speed main body control unit. An inverter control unit that operates based on off, and a variable speed compressor that is connected to the inverter control unit and controlled based on an output from the inverter control unit, the inverter control unit including the constant speed main body control A rotation speed setting section that operates based on power on / off of the section and sets the rotation speed of the variable speed compressor, and an inverter drive that drives the variable speed compressor at the rotation speed set by the rotation speed setting section And a variable speed compression unit configured to set a rotation speed by the rotation speed setting unit in conjunction with power on / off of the constant speed main body control unit, and by the inverter drive circuit unit. And driving the configuration, the inverter control unit further comprises rotational speed setting operation rate calculating unit for calculating the operating ratio from time to time and off is turned on based on the power on / off of the constant speed main control unit parts are are a configuration in which the operation rate determined by the operation rate calculating unit sets the rotational speed to fall within a predetermined.

As a result, a constant speed refrigerator can be obtained by simply incorporating an inverter control unit and a variable speed compressor into a constant speed refrigerator having a constant speed main body control unit that controls the constant speed by turning the compressor on / off with temperature detection means. In this case, there is no need to replace the main body control unit with an inverter control unit on the refrigerator main body side, and on the refrigerator manufacturer side, no troublesome work is required. An inverter-controlled refrigerator can be provided. That is, on the refrigerator manufacturer side, an inverter control unit and a variable speed compressor configured with the rotation speed setting unit and the inverter drive circuit unit as one unit, or an inverter compressor that combines these as an integral part, are used as parts. A simple inverter control type refrigerator can be obtained simply by incorporating it, and the simple inverter control type refrigerator can be provided easily and promptly according to the demand situation.
In addition, this reduces the rotational speed when the operating rate is lower than the predetermined operating rate, and conversely increases the rotational speed when the operating rate is higher than the predetermined operating rate. As a refrigerator, inverter control is performed within the operating rate range with the highest system efficiency. Since the unit controls the rotation speed of the compressor, a simple inverter-controlled refrigerator with high energy savings can be obtained.

According to a second aspect of the present invention, there is provided a constant speed main body control unit capable of driving a constant speed compressor and a cooling fan by power on / off by a temperature detecting means, and the constant speed main body control unit connected to the constant speed main body control unit. An inverter control unit that operates based on power on / off; and a variable speed compressor that is connected to the inverter control unit and is controlled based on an output from the inverter control unit. A speed setting unit that operates based on power on / off of the speed main body control unit and sets the speed of the variable speed compressor, and drives the variable speed compressor at the speed set by the speed setting unit. And an inverter drive circuit unit configured to set a rotational speed in the rotational speed setting unit in conjunction with power on / off of the constant speed main body control unit, Drives the variable-speed compressor, the cooling fan is configured to control ON / OFF by the constant-speed main body control unit, the inverter control unit is turned on based on the power on / off of the constant speed main control unit The operation rate calculation unit further calculates the operation rate from the time and the off time, and the rotation speed setting unit sets the rotation speed so that the operation rate determined by the operation rate calculation unit falls within a predetermined range. It is a structure.

This eliminates the need for wiring connection so that the cooling fan is controlled to be turned on / off by the inverter control unit, and makes it possible to make the constant speed refrigerator a simple inverter control refrigerator. The refrigerator can be provided more easily and quickly from time to time.
In addition, this reduces the rotational speed when the operating rate is lower than the predetermined operating rate, and conversely increases the rotational speed when the operating rate is higher than the predetermined operating rate. As a refrigerator, inverter control is performed within the operating rate range with the highest system efficiency. Since the unit controls the rotation speed of the compressor, a simple inverter-controlled refrigerator with high energy savings can be obtained.

According to a third aspect , in the first or second aspect , the operating rate calculation unit sets the operating rate correction value from the operating rate within a predetermined range and the efficiency of the variable speed compressor.

  Thus, the target operating rate is calculated from the ratio between the rotational speed at which the predetermined operating rate is achieved and the rotational speed at the maximum efficiency of the compressor alone. That is, the inverter control unit sets the compressor rotation speed in the range where the efficiency of the variable speed compressor is the highest, so that the energy saving performance is further improved and the simplified inverter control type refrigerator is further improved in energy saving performance. be able to.

According to a fourth invention, in the first to third inventions, the rotation speed setting unit drives the variable speed compressor by increasing the rotation speed when the power-on time exceeds a predetermined time.

  As a result, if the power-on cooling time is longer than the predetermined time, the number of revolutions can be increased to increase the cooling capacity, and rapid cooling becomes possible.

5th invention is the inverter control unit for refrigerators, The rotation speed setting part comprised so that rotation speed might be set based on the power ON / OFF detection circuit and the power ON / OFF signal from the said power ON / OFF detection circuit And an inverter drive circuit section that drives the variable speed compressor at the rotation speed set by the rotation speed setting section, and is configured as one unit, and the power on / off from the power on / off detection circuit is configured. The operation rate calculation unit further calculates an operation rate based on the off signal, and the rotation speed setting unit sets the rotation speed so that the operation rate determined by the operation rate calculation unit falls within a predetermined range. It is.

As a result, if the power on / off signal is detected, the rotation speed can be set only by the inverter control unit itself, so that the rotation speed setting function is not added to the equipment main body control unit side in which the inverter control unit is incorporated. However, variable speed control by an inverter becomes possible, and a simple inverter control type refrigerator can be easily obtained simply by incorporating this inverter control unit as a component.
In addition, when the device incorporating the inverter control unit is a refrigerator, the inverter controls the compressor rotation speed in the range of the operation rate with the highest system efficiency as a refrigerator. can do.

In a sixth aspect based on the fifth aspect , the operating rate calculation unit sets the operating rate correction value from an operating rate within a predetermined range and the efficiency of the variable speed compressor.

  As a result, when the device incorporating the inverter control unit is a refrigerator, the refrigerator sets the number of rotations of the compressor within the range where the efficiency of the variable speed compressor is the highest. Can be higher.

According to a seventh invention, in the fifth or sixth invention, when the power-on time exceeds a predetermined time, the rotational speed is increased to drive the variable speed compressor.

  Thereby, when the device incorporating the inverter control unit is a refrigerator, if the power-on cooling time is longer than a predetermined time, the number of rotations can be increased to increase the cooling capacity, and quick cooling is possible. .

According to an eighth invention, in the fifth to seventh inventions, the variable speed compressor can be driven by setting a rotation speed equal to or higher than a predetermined value for a predetermined time after the power is turned on.

  As a result, when the device incorporating the inverter control unit is a refrigerator, it is possible to perform cooling at a predetermined number of revolutions or more, for example, the maximum number of revolutions when starting to use the refrigerator or restarting operation after the defrosting operation. Cooling is possible.

A ninth aspect of the invention is an inverter compressor in which the refrigerator inverter control unit according to any one of the fifth to eighth aspects is integrated with a variable speed compressor.

  As a result, the inverter control unit and the variable speed compressor become one part in a paired shape, so that it can be combined in a compact manner, and the refrigerator manufacturer can simply incorporate it into the refrigerator. A simple inverter-controlled refrigerator can be obtained easily and quickly. Moreover, the inverter control unit and variable speed compressor can always be used in the form of setting the number of revolutions in the range where the efficiency of the variable speed compressor is the highest, and the energy saving performance of the equipment using this is the highest. Can be assured.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a simple inverter control type refrigerator in Embodiment 1 of the present invention, FIG. 2 is a rear view of the simple inverter control type refrigerator, and FIG. 3 is an inverter compressor incorporated in the simple inverter control type refrigerator. FIG.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a refrigerator main body filled with a foam heat insulating material, the interior of which is divided into two chambers, an upper refrigerator compartment 2 and a lower refrigerator compartment 3. A plurality of shelf plates 4 are arranged, and two freezer compartment cases 5 are provided in the lower freezer compartment 3 so as to be freely drawn out.

  And the front opening part of the refrigerator compartment 2 and the freezer compartment 3 of the said refrigerator main body 1 can be opened and closed by the doors 6 and 7, respectively.

  In addition, a refrigeration system configured by connecting a variable speed compressor 8, a cooler 9, a decompressor, an evaporator (all not shown) and the like in a loop shape is disposed on the back surface portion of the refrigerator body 1. In addition, the cool air generated by the cooler 9 is circulated to the refrigerator compartment 2 and the freezer compartment 3 by the cooling fan 10 to cool these chambers. And the frost adhering to the said cooler 9 is removed by the defrost heater 11 for every predetermined time.

  Further, a constant speed main body control unit 12 is incorporated in the rear portion of the refrigerator main body 1 together with the above-described refrigeration system, and controls a compressor (not shown) incorporated in the case of a constant speed refrigerator. However, in the case of a simple inverter control type refrigerator, an inverter control unit 14 is connected to the constant speed main body control unit 12 to control the variable speed compressor 8 at a variable speed.

  In this embodiment, the variable speed compressor 8 and the inverter control unit 14 are integrated in advance to form an inverter compressor 15 as shown in FIG. 3, and are incorporated in the case of a constant speed refrigerator. The inverter compressor 15 is installed instead of the compressor (not shown).

  Here, the integration means that the variable speed compressor 8 and the inverter control unit 14 are combined into one.

  In the present embodiment, the inverter control unit 14 is a bracket (not shown) welded to the outer shell of the variable speed compressor 8 via a mounting leg (not shown) provided on the inverter control unit 14. ).

  Hereinafter, the control of the variable speed compressor 8 by the constant speed main body control unit 12 and the inverter control unit 14, that is, the control of the simple inverter control type refrigerator will be described with reference to FIGS.

  4 is a control block diagram of a simple inverter control type refrigerator constructed by incorporating the inverter compressor 15, and FIG. 5 is a principal block diagram showing a circuit configuration around an inverter control unit of the simple inverter control type refrigerator. .

  In FIG. 4, reference numeral 16 denotes a commercial power supply. In the case of Japan, for example, a fixed voltage and fixed frequency power supply such as 100 V 60 Hz is used to supply power to the constant speed main body control unit 12 incorporated in the refrigerator main body 1.

  The constant speed main body control unit 12 includes a temperature detecting means 17 such as a thermostat, a defrosting heater 11 connected to the temperature detecting means 17 via a normally open contact 18a of a defrost timer 18 and a bimetal switch 19 for detecting the completion of defrosting. The temperature detection means 17 is provided with a cooling fan 10 and an on / off output unit 20 connected via a normally closed contact 18 b of the defrost timer 18.

  The inverter control unit 14 of the inverter compressor 15 incorporated in the refrigerator main body 1 is connected to the on / off output unit 20 of the constant speed main body control unit 12.

  As described above, the inverter control unit 14 is integrated in the refrigerator main body 1 in the state integrated with the variable speed compressor 8, that is, in the form of the inverter compressor 15, and the constant speed main body control unit 12 is turned on / off. Based on the on / off output from the output unit 20, the variable speed compressor 8 is subjected to variable speed control. Therefore, as shown in FIG. 5, the inverter control unit 14 includes a power on / off detection circuit 21, a rotation speed setting unit 23 including an operation rate calculation unit 22, and an inverter drive circuit unit 24. It is unitized and operates by obtaining power from the commercial power supply 16 to the constant speed main body control unit 12.

  The rotation speed setting section 23 sets the rotation speed based on the on / off output from the on / off output section 20 of the constant speed main body control section 12, and is constituted by a microcomputer. The on / off output supplied via the connector 25 of the on / off detection circuit 21 is converted into a signal by the photocoupler 26, the operation rate is calculated based on the on / off time, and the rotation speed is set. ing.

  The inverter drive circuit unit 24 includes a rectifier circuit that rectifies the commercial power supply 16 of the constant speed main body control unit 12, an inverter circuit configured by connecting six power elements in a three-phase bridge, and the variable speed compressor 8 A position detection circuit (not shown) for detecting the rotational position of the motor rotor is provided, and a rotational speed command from the rotational speed setting unit 23 and a rotational position detection of the compressor drive motor rotor from the position detection circuit. Depending on the state, the power element of the inverter circuit is on / off controlled to rotate the compressor drive motor.

  The operation of the simple inverter-controlled refrigerator configured as described above will be described with reference to FIGS.

  FIG. 6 is a control flow diagram of the simple inverter control type refrigerator, and FIG. 7 is a rotation speed determination flowchart showing the operation rate and rotation speed determination operation of the simple inverter control type refrigerator. STEP 11 in FIG. FIG. FIG. 8 is an explanatory diagram showing an example of operation timing in the rotational speed control of the simple inverter control type refrigerator.

  In FIG. 6, STEP 1 is the start of operation. Electric power is supplied from the commercial power supply 16 to the constant speed main body control unit 12, and the operation starts.

  At this time, when the temperature of the refrigerator compartment 2 is higher than a predetermined temperature, the constant speed main body control unit 12 is closed and the temperature detection means 17 is turned on, and when the temperature of the refrigerator compartment 2 is lower than the predetermined temperature, The detection means 17 is open and turned off.

  The inverter control unit 14 inputs either on / off output from the on / off output unit 20 of the constant speed main body control unit 12 in STEP 2 and determines the input in STEP 3.

If the determination in STEP 3 is OFF input, the variable speed compressor 8 is stopped in STEP 4, the stop time is measured in STEP 5, and the process returns to STEP 2.

  If the determination in STEP 3 is ON input, it is determined in STEP 6 whether or not the variable speed compressor 8 is already in operation. If it is in operation, the variable speed compressor 8 is operated in STEP 7 as it is. Measure the operation time with.

  Then, in STEP 9, it is determined whether the input from the on / off output unit 20 of the constant speed main body control unit 12 is on / off. If it is off, the process returns to STEP 2 and the operation from STEP 2 is repeated, and the variable speed type is performed in STEP 4. The compressor 8 is stopped. That is, the refrigerator compartment 2 reaches a predetermined temperature, the temperature detecting means 17 is turned off, and the cooling operation is stopped.

  On the other hand, if the determination in STEP 9 remains on, and the ON time measured in STEP 8 is equal to or longer than the predetermined time, the rotation speed setting unit 23 determines the rotation speed of the variable speed compressor 8 in STEP 10 according to the elapsed time. Is corrected, and the process returns to STEP2.

  The rotational speed correction of the variable speed compressor 8 is determined in advance according to the ON time of the variable speed compressor 8, and is set as shown in (Table 1), for example.

  That is, as shown in Table 1 above, when the ON time of the variable speed compressor 8 has passed 100 minutes, the rotational speed of the variable speed compressor 8 is increased by 2 speeds, and when 120 minutes have elapsed, the speed is further increased by 3 speeds. Then, the cooling capacity is increased, the process returns to STEP 2 and the operation from STEP 2 is repeated to continue the cooling operation.

  As described above, when the ON time of the variable speed compressor 8 is equal to or longer than the predetermined time, rapid cooling is possible by increasing the number of rotations and increasing the cooling capacity. For example, when the outside air enters due to opening / closing of the door and the load is increased, or when the load is increased due to an increase in the amount of food stored, the cooling can be performed quickly.

  Particularly in this embodiment, since the rotation speed is increased every second speed or every third speed, not every first speed, cooling can be performed more quickly and is effective.

  On the other hand, if it is determined in STEP 6 that the variable speed compressor 8 is not in operation, the operation rate calculator 22 calculates the rotation speed based on the operation rate of the variable speed compressor 8 in STEP 11.

  The rotation speed calculation based on the operating rate is performed as shown in the flowchart of FIG. That is, it is determined in STEP 15 whether the ON in STEP 3 is the first ON input. If it is not the first ON input, the ON time in the previous operation is captured in STEP 16, and then the OFF time in the previous operation is captured in STEP 17. In STEP18, the operation rate is calculated. This operating rate can be obtained by the following (Equation 1).

  Then, based on the operation rate calculated in STEP 18, the rotational speed of the variable speed compressor 8 is determined in STEP 19, and the variable speed compressor 8 is operated. This rotational speed is determined in advance according to the operation rate, and is set as shown in (Table 2), for example.

  That is, the operation rate is divided into several stages, and the operation rate that provides the most efficient operation is set as the target operation rate, and the acceleration / deceleration is set step by step as the operation rate increases or decreases above and below it. It has become. For example, the operation rate is divided into 8 stages from 0 to 100%, and if the operation rate at which the refrigerator is most efficiently operated is 68% to 74% as shown in Table 2, this is the target operation. With this as the center, the rotational speed is set by sequentially accelerating / decelerating one step at a time as the operating rate increases or decreases.

  Therefore, if the load does not fluctuate while the cooling operation is repeatedly turned on / off, the operating rate is gradually increased or decreased so that the operating rate becomes the most efficient target operating rate for the refrigerator. It becomes possible to drive and energy-saving operation is possible.

  In particular, in this embodiment, the degree of increase / decrease in the number of revolutions, that is, the range of change in the number of revolutions is set larger as the operation is performed at an operation rate having a large deviation rate from the target operation rate at which the refrigerator is operated most efficiently Therefore, as the deviation rate from the target operation rate, that is, the operation rate at which the refrigerator is most efficiently operated is large, the number of revolutions of the variable speed compressor 8 is greatly changed, and the target operation rate can be quickly achieved. It can be put into operation, and energy saving can be further promoted accordingly.

In this example, the target operating rate is 68% to 74%, but is slightly different depending on the capacity and form of the refrigerator. Therefore, the most efficient operation rate can be obtained by experiments and set in advance, and can be set appropriately. Usually, 50% to 90%, preferably 60% to 80%, a refrigerator with high energy saving can be obtained.

  On the other hand, if it is determined in STEP 15 that ON in STEP 3 is the first ON input, the rotation speed is set to a rotation speed higher than a predetermined rotation speed in STEP 20, for example, the maximum rotation speed, and the process proceeds to STEP 7 The variable speed compressor 8 is driven at the rotational speed. That is, when the ON output from the ON / OFF output unit 20 of the constant speed main body control unit 12 is the first ON input, in other words, in the first operation after turning on the power, it is estimated that the food is not cooled and the load is large. Therefore, the variable speed compressor 8 can be driven at the predetermined number of revolutions or more, in this example, at the maximum number of revolutions, and can be quickly cooled to the prescribed temperature.

  In this control, if the ON at STEP 3 is the ON input after the defrosting operation, this can be determined. If the temperature rises due to the defrosting and the load increases, the variable speed compression is always performed. The machine 8 is driven at the maximum number of revolutions and can be quickly cooled to a predetermined temperature, which is effective. The driving at the maximum number of revolutions at the time of defrosting may be stopped based on the defrosting end detection signal from the defrosting end detection thermistor.

  Next, the above-described rotation speed control will be described in detail with reference to FIG.

  FIG. 8 is an explanatory diagram showing an example of operation timing in the rotational speed control of the simple inverter control type refrigerator in the first embodiment of the present invention.

  8A shows the cooling operation, that is, the temperature state of the refrigerator compartment 2 when the inverter control unit 14 is operating the variable speed compressor 8, and FIG. 8B shows the temperature of the variable speed compressor 8. It shows the driving situation, and the horizontal axis shows time.

  First, when an ON output is input from the ON / OFF output unit 20 of the constant speed main body control unit 12 and the inverter control unit 14 starts to drive the variable speed compressor 8, if the ON input is the first ON input, The variable speed compressor 8 rotates at the maximum rotation speed, for example, 62 rps, as indicated by t1, and starts cooling.

  Thereby, the refrigerator compartment 2 is cooled, and when the temperature gradually decreases and reaches a predetermined temperature, that is, the compressor off temperature, the variable speed compressor 8 is stopped.

  And if the temperature of the refrigerator compartment 2 rises gradually and reaches compressor ON temperature, the variable speed type compressor 8 will drive, and cooling will advance as shown by t2.

  At this time, if the on-time t1 in the previous operation of the variable speed compressor 8 is 100 minutes and the off-time is 50 minutes, the operation rate calculated based on the equation 1 from the on / off time is 67%. The rotation speed setting unit 23 corresponds to a predetermined rotation rate range shown in Table 2, which corresponds to an operation rate of 62% to 68% in this example. Therefore, the rotation speed of the previous operation is reduced by one step. Set to a number.

  The acceleration / deceleration stages of the variable speed compressor 8 are set to 8 stages 1 to 8 as described above, and the respective rotation speeds are set as shown in the following (Table 3), for example. It is.

  Therefore, in this case, the rotational speed setting unit 23 of the inverter control unit 14 is set to 52 rps by decelerating to stage 7 since the rotational speed at the previous operation was stage 8 of 62 rps at the maximum speed based on Table 3. The variable speed compressor 8 is rotated at 52 rpm.

  Next, the variable speed compressor 8 rotates at 52 rps and proceeds with cooling as indicated by t2. When the refrigerator compartment 2 is cooled to a predetermined temperature, the variable speed compressor 8 stops and the temperature of the refrigerator compartment 2 is reduced. When it starts to rise and rises to the compressor on temperature, the variable speed compressor 8 is driven again and starts cooling.

  If the ON time of the variable speed compressor 8 at this time is 30 minutes and the OFF time is 50 minutes, the operation rate calculated from the ON / OFF time is 38%, and the rotation speed setting unit 23 is predetermined. The deceleration corresponding to the operation rate range in which 38% of Table 2 falls, in this example, the speed is further reduced by four steps from the rotation speed at the previous operation. Further, from Table 3, the rotational speed setting unit 23 sets the rotational speed to 32 rps, which is decelerated four stages from stage 7 to stage 3 in the previous operation, and the variable speed compressor 8 rotates at this 32 rps for cooling. .

  Further, the variable speed compressor 8 rotates at 32 rps and proceeds with cooling as indicated by t3. When the refrigerator compartment 2 is cooled to a predetermined temperature, the variable speed compressor 8 stops and the refrigerator compartment 2 temperature rises. When it starts to rise to the compressor on temperature, the variable speed compressor 8 is driven again and cooling is started.

  If the ON time of the variable speed compressor 8 at this time is 60 minutes and the OFF time is 30 minutes, the operation rate calculated from the ON / OFF time is 67%, and the rotation speed setting unit 23 is predetermined. Deceleration corresponding to the operating rate range in which 67% of Table 2 falls, in this example, the speed is further reduced by one step from the rotational speed at the previous operation. Further, from Table 3, the rotational speed setting unit 23 sets the rotational speed to 29 ps, which is decelerated by one stage from stage 3 to stage 2 in the previous operation, and the variable speed compressor 8 rotates at this 29 rps to perform cooling. .

Furthermore, the variable speed compressor 8 rotates at 29 rps and proceeds with cooling as indicated by t4. When the refrigerator compartment 2 is cooled to a predetermined temperature, the variable speed compressor 8 stops and the temperature of the refrigerator compartment 2 rises. When it starts to rise to the compressor on temperature, the variable speed compressor 8 is driven again and cooling is started.

  If the ON time of the variable speed compressor 8 at this time is 77 minutes and the OFF time is 30 minutes, the operation rate calculated from the ON / OFF time is 72%, and the rotation speed setting unit 23 determines in advance. The operation rate range in which 70% of Table 2 falls, in this example, the rotation speed at the previous operation is maintained. The rotation speed setting unit 23 maintains the rotation speed of 29 rps, and the variable speed compressor 8 rotates at the 29 rps for cooling.

  Further, when the variable speed compressor 8 rotates at 29 rps and the cooling proceeds as indicated by t5, and 100 minutes elapses as it is, the rotational speed setting unit 23 considers that the cooling capacity is insufficient, as shown in Table 1. Then, the rotational speed is increased by 2 and set to 35 rps, the variable speed compressor 8 is operated, and the cooling operation is continued.

  When the refrigerator compartment 2 is cooled to a predetermined temperature, the variable speed compressor 8 is stopped, and when the refrigerator compartment 2 temperature starts to rise and rises to the compressor on temperature, the variable speed compressor 8 is driven again, Start cooling.

  If the on-time of the variable speed compressor 8 at this time is 110 minutes in total of 100 minutes of 29 rps rotation and 10 minutes of 35 rps rotation and the off time is 50 minutes, the operation rate calculated from the on / off time Is 78%, and the rotation speed setting unit 23 maintains a predetermined operation rate range in which 68% of Table 2 falls, in this example, the rotation speed during the previous operation. The rotation speed setting unit 23 maintains the rotation speed of 35 rps, and the variable speed compressor 8 rotates at the 35 rps for cooling.

  Thereafter, the same operation is repeated, and cooling is performed by rotating the variable speed compressor 8 at the rotation speed set by the rotation speed setting unit 23 of the inverter unit 14.

  As described above, this simple inverter-controlled refrigerator operates.

  And the simple inverter control type refrigerator which operates in this way is the constant speed type refrigerator having the constant speed main body control unit 12 which controls the constant speed by turning the compressor on / off by the temperature detecting means 17, and the inverter control unit 14. By simply incorporating the variable speed compressor 8, the constant speed refrigerator can be a simple inverter control refrigerator.

  In addition, at that time, it is not necessary to replace the main body control unit with the inverter control unit 14 on the refrigerator main body side, and an inverter control type refrigerator can be provided without any troublesome trouble on the refrigerator manufacturer side.

  That is, the refrigerator manufacturer side has the inverter control unit 14 and the variable speed compressor 8 that are configured by the rotation speed setting unit 23 and the inverter drive circuit unit 24 as one unit, or an inverter compressor that combines these integrally. The simple inverter control type refrigerator can be obtained simply by incorporating 15 as a component, and the simple inverter control type refrigerator can be provided easily and promptly according to the demand situation.

  Further, in the present embodiment, the cooling fan 10 is controlled by the constant speed main body control unit 12, so that it is not necessary to perform wiring connection so as to perform on / off control by the inverter control unit 14. The constant speed refrigerator can be a simple inverter-controlled refrigerator. Therefore, a simple inverter control type refrigerator can be provided more easily and quickly as needed.

  In addition, the inverter control unit 14 is configured to set the rotation speed so that the operation rate determined by the operation rate calculation unit 22 that calculates the operation rate falls within a predetermined range. When it is low, the rotational speed is lowered, and conversely, when it is higher than the predetermined operation rate, the rotational speed is increased. As a result, the number of revolutions of the variable speed compressor 8 is controlled within the range of the operation rate with the highest system efficiency as a refrigerator, and a refrigerator with high energy savings can be obtained.

  Further, since the rotational speed setting unit 23 is configured to drive the variable speed compressor 8 by increasing the rotational speed when the power-on time exceeds a predetermined time, the power-on cooling time exceeds the predetermined time. If it becomes longer, the number of revolutions can be increased to increase the cooling capacity, and rapid cooling becomes possible.

  On the other hand, the inverter control unit 14 includes a power on / off detection circuit 21 and a rotation speed setting unit 23 configured to set the rotation speed based on a power on / off signal from the power on / off detection circuit 21; An inverter drive circuit unit 24 that drives the variable speed compressor 8 at the rotation speed set by the rotation speed setting unit 23 is provided, and these are configured as one unit.

  Thus, the inverter control unit 14 can set the rotation speed only by the inverter control unit 14 itself if it detects the power on / off signal. Therefore, it is possible to perform variable speed control by an inverter without adding a rotation speed setting function to the device main body control unit such as the constant speed main body control unit 12 incorporating the inverter control unit 14. A simple inverter control type refrigerator can be easily obtained simply by incorporating 14 as a component in a constant speed refrigerator.

  Moreover, since the inverter control unit 14 is configured to set the rotation speed so that the operation rate determined by the operation rate calculation unit 22 falls within a predetermined range, when the inverter control unit 14 is incorporated in a refrigerator, The refrigerator can rotate the variable speed compressor 8 in the range of the operation rate with the highest system efficiency as a refrigerator, and can improve energy saving performance as a refrigerator.

  Furthermore, since the inverter control unit 14 can drive the variable speed compressor 8 by increasing the rotational speed when the power-on time exceeds a predetermined time, when the inverter control unit 14 is incorporated in a refrigerator, If the power-on cooling time is longer than a predetermined time, the number of revolutions can be increased to increase the cooling capacity, and a refrigerator capable of rapid cooling can be provided.

  Moreover, since the inverter control unit 14 is capable of driving the variable speed compressor 8 by setting the number of revolutions at a predetermined value or more for a certain period of time after the power is turned on, when the inverter control unit 14 is incorporated in a refrigerator, At the start of use of the refrigerator or when the operation is resumed after the defrosting operation, cooling can be performed at a predetermined rotation speed or higher, for example, the maximum rotation speed, and a refrigerator capable of rapid cooling can be provided.

  Since the inverter compressor 15 in which the inverter control unit 14 is integrated with the variable speed compressor 8 has the inverter control unit 14 integrally, instead of the constant speed compressor of the constant speed refrigerator. A simple inverter-controlled refrigerator can be obtained simply by incorporating it. Therefore, while producing a constant-speed refrigerator, it becomes possible to produce a simple inverter-controlled refrigerator in the middle, and at that time, the inverter control unit 14 and the variable-speed compressor 8 are integrated, Assembling work can be easily performed, and a simple inverter-controlled refrigerator can be provided quickly as needed.

(Embodiment 2)
Next, the simple inverter control type refrigerator in Embodiment 2 is demonstrated.

  FIG. 9 is a rotational speed determination flowchart showing the operation of determining the operating rate and the rotational speed of the simple inverter control type refrigerator in the second embodiment, and FIG. 10 shows the operating rate and the compressor rotational speed of the simple inverter control type refrigerator. FIG. 11 is a characteristic diagram showing the relationship between the efficiency and the rotational speed of the variable speed compressor used in the simple inverter-controlled refrigerator.

  In the simplified inverter control type refrigerator in the second embodiment, the rotation speed setting unit including the operation rate calculation unit of the inverter control unit corrects the operation rate of the refrigerator in consideration of the efficiency of the variable speed compressor 8, The number of rotations that matches the operating rate is determined, and the other refrigerator configurations and control configurations are the same as those in the first embodiment, and the description thereof will be omitted with the aid of FIGS.

  In FIG. 9, the rotational speed setting unit of the second embodiment is similar to the first embodiment, and after obtaining the operation rate from the ON time and the OFF time of the variable speed compressor 8 at STEP 18, the variable speed type at STEP 21. The operating rate of the refrigerator is corrected in consideration of the efficiency of the compressor 8, and the rotational speed is determined in STEP19.

  The correction of the operation rate in consideration of the efficiency of the variable speed compressor 8 is obtained by the following (Equation 2).

  That is, as shown in FIG. 10, assuming that the operation rate at which the amount of power consumption is the smallest as a refrigerator is 70% in the calculation, for example, the variable speed compressor 8 at that time has the horizontal axis portion of the rotational speed in FIG. As shown in FIG. 4, the rotation speed is 30 rps.

  However, in the variable speed compressor 8, the rotational speed at which the operating efficiency of the compressor alone is the best is not necessarily the rotational speed of 30 rps. As shown in FIG. Assuming that it is the rotational speed, the operating rate calculation unit calculates 84% [operating rate 70% × (operating rate 70) as the operating rate (corrected operating rate) taking into account the efficiency of the variable speed compressor 8 from the above formula 2. % Of the rotation speed of the compressor at 30% / rotation speed of 25 rps at which the efficiency of the compressor exhibits the highest efficiency).

  Then, by operating at an operation rate of 84% in this way, as shown in FIG. 10 (A), the variable speed compressor 8 having a rotational speed of 25 rps at which the operating efficiency of the compressor alone is the best is used. Even if it is, the power consumption is suppressed to the same level as when the refrigerator power consumption is low (b) at the 70% operation rate where the calculation power consumption is the smallest as the refrigerator shown in FIG. can do. In other words, efficient energy-saving operation can be realized up to the same level as the calculation.

  The efficiency of the variable speed compressor refers to a value measured under typical compressor measurement conditions such as the Ashley condition.

Further, the operation rate correction value shown in the present embodiment, that is, the operation taking into account the efficiency of the compressor in the present invention does not mean only the value obtained by the above equation 2, but is obtained by at least the above equation 2. The value when the power consumption as the refrigerator is corrected to be less than the operation rate at the previous time (when the compressor efficiency is not taken into account) is corrected, and the operation is performed according to the value. This can be determined, for example, by the rotational speed of the compressor.

  The simple inverter control type refrigerator in the second embodiment that operates as described above has the same effects as the simple inverter control type refrigerator in the first embodiment, and also has the following effects.

  That is, since the operation rate calculation unit 22 of the inverter control unit 14 is configured to set the operation rate correction value in a form that incorporates the efficiency of the variable speed compressor 8 in addition to the operation rate in a predetermined range. It is possible to calculate a target operating rate taking into account the efficiency of the compressor from the ratio between the rotational speed at which the predetermined operating rate is achieved and the rotational speed at the highest efficiency of the single variable speed compressor.

  Therefore, the inverter control unit 14 sets the compressor rotation speed in the range where the efficiency of the variable speed compressor 8 is the highest, further enhances energy saving, and provides a simple inverter control type refrigerator with higher energy saving. be able to.

  Moreover, since the inverter control unit 14 and the variable speed compressor 8 are integrated or paired, the operating rate is always within a predetermined range while the variable speed compressor 8 is efficient. The refrigerator manufacturer can reliably operate under conditions that take into account the efficiency of the compressor without adjusting the efficiency and operating rate of the variable speed compressor 8. It can be set as a simple inverter control type refrigerator.

  Similarly, the inverter control unit 14 is configured so that the operation rate calculation unit 22 sets the operation rate correction value from the operation rate in a predetermined range and the efficiency of the variable speed compressor 8. When 14 is incorporated in the refrigerator, the refrigerator can set the number of rotations of the compressor within the range where the efficiency of the variable speed compressor 8 is the highest, so that it is possible to provide a highly energy-saving refrigerator.

  The inverter compressor 15 in which the inverter control unit 14 is integrated with the variable speed compressor 8 is always a refrigerator in which the operation rate is in a predetermined range while the efficiency of the variable speed compressor 8 is good. A simple inverter control type that can be operated under conditions that take into account the efficiency of the compressor without the need to adjust the efficiency and operating rate of the variable speed compressor 8 at the refrigerator manufacturer. The refrigerator can be provided.

  In the second embodiment, the inverter control unit 14 and the variable speed compressor 8 are in a paired state. The inverter control unit 14 and the variable speed compressor 8 are separated from each other. It means that it may be installed in a separated state.

  Specifically, as shown in FIG. 12, the inverter control unit 14 is placed above the refrigerator, for example, near the constant speed main body control unit 12 on the back of the refrigerator main body 1, and the variable speed compressor 8 is placed below the refrigerator. It may be installed in a separated state.

When installed in such a state, the following effects can be expected. That is, for example, when it is used in an area or country (for example, a country in a tropical region) where inundation occurs frequently due to flooding or the like, it is possible to prevent water from entering the inverter control unit 14 and the inverter control unit 14 is not useful. It can prevent falling into a situation. In addition, no matter what region is used, the influence of heat from the variable speed compressor 8 on the inverter control unit 14 can be reduced, and the reliability of the inverter control unit can be prevented from being lowered.

  As mentioned above, although the simple inverter control type refrigerator which concerns on this invention, the inverter control unit for refrigerators, and the inverter compressor using the same were demonstrated using the said embodiment, this invention is not limited to this. . That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. That is, the scope of the present invention is shown not by the configuration exemplified in the above embodiment but by the scope of claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of claims. .

  As described above, according to the present invention, a constant-speed refrigerator can be easily converted into an inverter-controlled refrigerator, and a simple inverter-controlled refrigerator that can be manufactured quickly and at any time according to the demand situation can be provided. it can.

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Refrigerating room 3 Freezer room 4 Shelf board 5 Freezer room case 6, 7 Door 8 Variable speed compressor 9 Cooler 10 Cooling fan 11 Defrost heater 12 Constant speed main body control part 14 Inverter control unit 15 Inverter compressor 16 Commercial power supply 17 Temperature detection means 18 Defrost timer 19 Bimetal switch 20 On / off output section 21 Power on / off detection circuit 22 Operation rate calculation section 23 Speed setting section 24 Inverter drive circuit section 25 Connector 26 Photocoupler

Claims (9)

A constant-speed main body control unit capable of driving a constant-speed compressor by turning on / off the power by temperature detection means, and an inverter connected to the constant-speed main body control unit and operating based on power-on / off of the constant-speed main body control unit A control unit;
A variable speed compressor connected to the inverter control unit and controlled based on an output from the inverter control unit;
The inverter control unit is
A rotation speed setting section that operates based on power on / off of the constant speed main body control section and sets the rotation speed of the variable speed compressor;
An inverter drive circuit section for driving the variable speed compressor at the rotation speed set by the rotation speed setting section;
Have
In conjunction with the power on / off of the constant speed main body control unit, the rotational speed is set by the rotational speed setting unit, and the variable speed compressor is driven by the inverter drive circuit unit ,
The inverter control unit further includes an operation rate calculation unit that calculates an operation rate based on the time when the constant speed main body control unit is turned on and off based on the time when the constant speed main body control unit is turned off. A simple inverter-controlled refrigerator configured to set the rotation speed so that the operation rate determined by the calculation unit falls within a predetermined range . A constant-speed main body controller capable of driving the constant-speed compressor and the cooling fan by turning on / off the power by the temperature detection means;
An inverter control unit connected to the constant speed main body control unit and operating based on power on / off of the constant speed main body control unit;
A variable speed compressor connected to the inverter control unit and controlled based on an output from the inverter control unit;
The inverter control unit is
A rotation speed setting section that operates based on power on / off of the constant speed main body control section and sets the rotation speed of the variable speed compressor;
An inverter drive circuit section for driving the variable speed compressor at the rotation speed set by the rotation speed setting section;
Have
The rotation speed is set by the rotation speed setting section in conjunction with power on / off of the constant speed main body control section, the variable speed compressor is driven by the inverter drive circuit section, and the cooling fan is fixed It is configured to be on / off controlled by the speed main body control unit ,
The inverter control unit further includes an operation rate calculation unit that calculates an operation rate based on the time when the constant speed main body control unit is turned on and off based on the time when the constant speed main body control unit is turned off. A simple inverter-controlled refrigerator configured to set the rotation speed so that the operation rate determined by the calculation unit falls within a predetermined range . The simple inverter control type refrigerator according to claim 1 or 2 , wherein the operating rate calculation unit is configured to set an operating rate correction value from an operating rate within a predetermined range and the efficiency of the variable speed compressor. The simple inverter-controlled refrigerator according to any one of claims 1 to 3 , wherein the rotation speed setting unit is configured to drive the variable speed compressor by increasing the rotation speed when the power-on time exceeds a predetermined time. . A power on / off detection circuit, a rotational speed setting unit configured to set the rotational speed based on a power on / off signal from the power on / off detection circuit, and a rotational speed set by the rotational speed setting unit. Inverter drive circuit unit that drives the variable speed compressor, and configure these as one unit ,
The driving rate calculation unit further calculates a driving rate based on the power ON / OFF signal from the power ON / OFF detection circuit, and the rotation speed setting unit has a predetermined range of the driving rate determined by the driving rate calculation unit. The inverter control unit for refrigerators which set the rotation speed so that it may enter . 6. The inverter control unit for a refrigerator according to claim 5 , wherein the operating rate calculation unit is configured to set an operating rate correction value from an operating rate in a predetermined range and the efficiency of the variable speed compressor. The inverter control unit for a refrigerator according to claim 5 or 6, wherein when the power-on time exceeds a predetermined time, the number of revolutions is increased to drive the variable speed compressor. The inverter control unit for a refrigerator according to any one of claims 5 to 7 , wherein the variable speed compressor can be driven by setting a rotation speed equal to or higher than a predetermined value for a certain period of time after the power is turned on. The inverter compressor which integrated and comprised the inverter control unit for refrigerators of any one of Claims 5-8 in the variable speed compressor.

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