JP2005016877A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a versatile cooling unit without the need for exclusively designing a cooling system for each room to be cooled or for each large refrigerator. <P>SOLUTION: The refrigerator simply comprises the cooling unit formed by a compressor 4, an evaporator 1, a condenser 2, an expansion means 5, an evaporator fan motor 101, and a condenser fan motor 3, a casing combined therewith and having an outside air temperature sensor 104 for detecting an outside air temperature and an inside temperature sensor 111, and a first control device for determining the operation range of the compressor 4 in accordance with the detection results of the outside air temperature sensor 104 and the inside temperature sensor 105. It is easy to apply for model development. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling unit in which a compressor and a condenser of a cooling system are installed in the upper part of the gantry and an evaporator is installed in the lower part of the gantry, and a large commercial refrigerator-freezer provided with the cooling unit in the upper part of the main body. .
[0002]
[Prior art]
Conventionally, in large storages and commercial freezer refrigerators, a cooling unit with a cooling system compressor and condenser installed at the top of the gantry and an evaporator at the bottom of the gantry has been designed exclusively for each company's own housing. It is installed.
[0003]
An example of a conventional cooling unit is disclosed in Patent Document 1.
[0004]
The conventional cooling unit will be described below with reference to the drawings.
[0005]
FIG. 4 is a structural example of a large refrigerator when a conventional cooling unit is used.
[0006]
In FIG. 4, 1 is an evaporator, 2 is a condenser, 3 is a condenser fan motor, 4 is a compressor, 5 is expansion means, 6 is a drive circuit for driving the fan and compressor, and 101 is an evaporator fan motor. Yes, the first unit 102 is configured by the above-described configuration.
[0007]
Since the second unit 103 has the same configuration as the first unit 102, description thereof is omitted.
[0008]
Reference numeral 104 denotes an outside air temperature sensor that detects the outside air temperature, and reference numeral 105 denotes an inside temperature sensor that detects the temperature inside the room to be cooled.
[0009]
Reference numerals 107 and 108 denote the interior when a refrigerator is assumed.
[0010]
The first unit 102 is attached so as to cool the refrigerator compartment 107, and the second unit 103 is attached so as to cool the interior 108.
[0011]
Reference numeral 7 denotes a main control board. Based on information from the outside air temperature sensor 104 and the inside temperature sensor 105, the drive circuit 6 and the second unit 103 in the first unit 102 are set so that the inside temperature becomes constant. A command for moving the driving circuit 6 is issued.
[0012]
In the conventional cooling unit, the gas refrigerant discharged from the compressor 4 is sent to the condenser 2. In the condenser 2, the sent high-temperature gas refrigerant is condensed and liquefied, and the obtained liquid refrigerant is sent to the fender 5.
[0013]
At this time, the condenser fan motor 3 is driven, and the outside air is discharged to the atmosphere after being heated by exchanging heat with the gas refrigerant in the process of passing through the condenser 2.
[0014]
In the expansion means 5, it becomes a gas-liquid two-phase refrigerant, enters the evaporator 1, where it exchanges heat with the inside air, and the evaporator fan motor 101 conveys the cold air into the inside.
[0015]
Then, the evaporated and evaporated refrigerant returns to the compressor 4 again.
[0016]
For example, when the refrigerator compartment 107 is cooled, the information of the inside temperature sensor 105 attached to the refrigerator compartment 107 is input to the main controller 7, and the drive circuit of the first unit 102 is output by an output command from the main controller 7. 6 is operated.
[0017]
When the inside 108 is cooled, the information of the inside temperature sensor 105 attached to the inside 108 is input to the main control device 7, and the drive circuit 6 of the second unit 103 is turned on by an output command from the main control device 7. Make it work.
[0018]
That is, a configuration is adopted in which a plurality of cooling units are controlled by a single main board.
[0019]
[Patent Document 1]
JP 2002-340449 A [0020]
[Problems to be solved by the invention]
However, in the large-sized refrigerator-freezer using the conventional cooling unit, a plurality of rooms, for example, one cooling unit per refrigerator room and one cooling unit per refrigerator room, When a cooling unit is installed, the main control board that manages the control is usually consolidated into one, and sensors installed in each individual warehouse are also integrated into the main control board. Thus, a plurality of cooling units are driven by collective management by the main control board 7.
[0021]
In particular, in order to save energy in large refrigerator-freezers, compressor and fan motor capacity control based on internal and external temperatures, compressor protection control based on evaporator and condenser temperatures, internal and external temperatures, etc. It is necessary to perform on / off control of the dew prevention heater due to the increase in the number of inputs and outputs.
[0022]
When taking such a configuration, it is necessary not only to make a main control board for each model individually, but also to make a main control board 7 with a large number of inputs and outputs mounted so that it can handle multiple models. However, there is a drawback that not only the size becomes huge but also very expensive.
[0023]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention includes a compressor, an evaporator, a condenser, a cooling system including expansion means, an evaporator fan motor that conveys cold air generated in the evaporator, A cooling unit including a condenser fan motor that cools the condenser, an outside air temperature sensor that detects an outside air temperature where the housing is installed, and an internal temperature sensor that detects the temperature inside the housing. In the housing, a refrigerator is formed by combining the cooling unit and the housing, and the operation range of the compressor of the cooling unit is determined based on the detection results of the outside air temperature sensor and the internal temperature sensor. It is equipped with a control device, and it is possible to easily make a refrigerator simply by designing a housing and installing a cooling unit, and can easily cope with the development of models.
[0024]
According to the second aspect of the present invention, the compressor according to the first aspect of the present invention is an inverter compressor, and the control device is provided with an inverter control unit, so that a necessary refrigeration capacity can be obtained for each case. The refrigeration capacity can be varied according to the load fluctuation.
[0025]
The invention according to claim 3 further includes an evaporator temperature sensor for detecting the temperature of the evaporator and a condenser temperature sensor for detecting the temperature of the condenser, in addition to the invention according to claim 1 or 2. Since the operation status of the refrigerator can be grasped from the condensation temperature and the evaporation temperature, the operation outside the specified use range of the compressor can be avoided and the compressor can be protected.
[0026]
The invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising a dew prevention heater, wherein the dew prevention heater is provided according to a detection result of an internal temperature sensor. By providing a control device with a function to control the energization to the condenser and a function to control the voltage applied to the condenser fan motor in conjunction with the detection result of the condenser temperature detection sensor, unnecessary heater energization and fan drive Can be suppressed, and power consumption can be reduced.
[0027]
According to a fifth aspect of the present invention, in addition to the first aspect of the present invention, a current sensor is disposed on a power supply line, and a power consumption is calculated from a result of the current sensor. By providing the display function, the user can recognize the electricity bill.
[0028]
The invention according to claim 6 is characterized in that, in the case where a plurality of cooling units are further mounted on the invention according to any one of claims 1 to 5, each is connected by a communication line, Restrictions can be set for phenomena that require mutual restrictions. For example, it is possible to avoid starting the compressor at the same time in order to prevent the breaker from falling.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a large refrigerator for business use according to the present invention will be described with reference to the drawings.
[0030]
(Embodiment 1)
FIG. 1 is a configuration diagram of a large refrigerator equipped with a cooling unit according to Embodiment 1 of the present invention.
[0031]
FIG. 2 is an internal block diagram of a control device used in the refrigerator according to the embodiment. In addition, about the same structure as the past, the same number is attached | subjected and detailed description is abbreviate | omitted.
[0032]
In FIG. 1, 1 is an evaporator, 2 is a condenser, 3 is a condenser fan motor, 4 is a compressor, 5 is an expansion means, and 101 is an evaporator fan motor, which constitutes one cooling system.
[0033]
Reference numeral 106 denotes a refrigerator housing. In the first embodiment, there are two rooms to be cooled, which are divided into a refrigerator room 107 and a freezer room 108.
[0034]
Further, in the first embodiment, the upper portion of the housing 106 is a machine room 109, and the first cooling unit 102 and the second cooling unit 103 are installed.
[0035]
Among the cooling systems constituting the cooling unit, the evaporator 1 and the evaporator fan motor 101 are installed inside the cabinet, and the condenser 2, the condenser fan motor 3 and the compressor 4 are installed on the machine room side. .
[0036]
One cooling unit, for example, the first cooling unit 102 is basically configured by the above-described cooling system and the control device 1 201 that controls the actuator of the cooling system and can operate independently.
[0037]
Since the second cooling unit 103 also has the same basic configuration as the first cooling unit 102, a description of detailed operations of the sensor and the like is omitted.
[0038]
Reference numeral 104 denotes an outside air temperature sensor that detects the outside air of the unit or the ambient temperature of a refrigerator equipped with the air.
[0039]
Reference numeral 105 denotes an internal temperature sensor for detecting the internal temperature of the side cooled by the unit (for example, the air temperature in the refrigerator compartment 107).
[0040]
110 is a condenser temperature sensor that detects the temperature of the condenser 2, and 111 is an evaporator temperature sensor that detects the temperature of the evaporator 1.
[0041]
Reference numeral 112 denotes a dew prevention heater that heats the joint surface in order to prevent this dew condensation, since dew condensation may occur on the joint surface with the front door of the refrigerator when the interior is cooled by the unit.
[0042]
Reference numeral 113 denotes display means for displaying the set temperature, the current internal temperature, and the like.
[0043]
114 is a current sensor, and 115 is a communication means.
[0044]
FIG. 2 is a block diagram of the configuration of the first control device 201 and the second control device 301. In the first embodiment, each of the first control device 201 and the second control device 301 is connected by the communication means 115. Each single unit can control the cooling cycle, and both are the same.
[0045]
In the first embodiment, various sensors, dew prevention heaters, display means and the like are wired in advance as a part of the unit, and the unit user does not need to newly attach them.
[0046]
The first control device 201 includes an input unit 202 that converts a detection value of a sensor or the like into a voltage, a first microcomputer 204 that includes control software, an output unit 205 that drives an actuator such as a heater or a fan motor, and a compression An inverter control unit 206 that controls the machine and a communication unit 203 that oscillates operation information of the control device to the outside.
[0047]
The operation will be described below with reference to FIGS.
[0048]
Regarding the operation, since the basic operation of the first unit 102 and the second unit 103 is the same, the operation of the first unit 102 will be described as a representative example.
[0049]
First, when the power is turned on, the inside temperature of the refrigerator compartment 107 is detected by the inside temperature sensor 105, converted into a voltage by the input unit 202 of the first control device 201, and sent to the first microcomputer 204. The detected value is T1 ° C.
[0050]
The first microcomputer 204 compares the detected internal temperature T1 with a specified value (for example, a set value K1). For example, if T1> K1, the refrigerator compartment 107 needs to be cooled and the cooling system should be operated. A signal is sent from the first microcomputer 204 to the output unit 205 and the inverter control unit 206, the condenser fan motor 3, the compressor 4, and the evaporator fan motor 101 move, and the refrigerant flows in the cooling system.
[0051]
The refrigerant evaporated in the evaporator 1 exchanges heat with the surrounding air, and the cooled air is forcibly sent to the refrigerator compartment 107 by the wind generated by the evaporator fan motor 101, and the refrigerator compartment 107 is cooled. .
[0052]
Finally, the first microcomputer compares the detected internal temperature T1 with a specified value (for example, set value K1). For example, if T1 = K1 or T1 <K1, the first microcomputer is used to stop the cooling system. A signal is sent from the microcomputer to the output unit 205 and the inverter control unit 206, the condenser fan motor 3, the compressor 4, and the evaporator fan motor 101 are stopped, and the circulation of the refrigerant in the cooling system is stopped.
[0053]
When the compressor 4 is induction, the inverter control unit 206 is not necessary, and it is only necessary to operate / stop the compressor 4 using a relay or the like instead.
[0054]
While the compressor 4 is stopped, the evaporator fan motor 101 may continue to rotate in order to circulate the air in the refrigerator.
[0055]
Since the outside air temperature is detected, for example, when the outside air temperature is low, the condenser fan motor 3 may be activated with a delay from the activation of the compressor 4.
[0056]
By repeating the above operation, the refrigerator compartment 107 can maintain the set temperature.
[0057]
The outside air temperature sensor 104, the inside temperature sensor 105, the evaporator temperature sensor 111, and the condenser temperature sensor 110 always detect each temperature and send information to the first microcomputer 204.
[0058]
For example, FIG. 3 shows a safe operation range of a certain compressor 4 when stable. If the pressure calculated from the temperature data detected by the evaporator temperature sensor and the condenser temperature sensor is outside the range of FIG. If the first microcomputer 204 determines that there is a signal (for example, point 1 in FIG. 3), a signal is sent from the first microcomputer 204 to the inverter control unit 206 to reduce the rotation speed of the compressor 4 in order to reduce the condensation pressure. The inverter control unit 206 decreases the rotation speed until it enters the safe driving range of FIG.
[0059]
It is clear that once the refrigerator compartment 107 is cooled, the amount of heat to be cooled can be reduced. At this time, in this Embodiment 1, the refrigeration capacity of a cooling cycle can be changed at any time by making the compressor 4 into the variable inverter compressor.
[0060]
Further, when the temperature detected by the internal temperature sensor 105 is T1 <set value K2 and outside air temperature A1> set value K3, dew condensation occurs near the junction between the housing and the door. In order to operate the prevention heater 112, a signal is output from the output unit 205.
[0061]
When T1> K2, the dew heater 112 is not operated.
[0062]
The relationship between K2 and K3 is realized by having a table in which the dew point temperature at that time is estimated, but details are not described in the first embodiment.
[0063]
Also, when the inside of the refrigerator is cold or when the outside air temperature is low, the load on the cooling system is also reduced, so the condensing temperature is lowered, the voltage applied to the condenser fan motor 3 is suppressed, and the rotational speed is lowered. The power consumption can be reduced.
[0064]
Similarly, the voltage applied to the evaporator fan motor 101 may be suppressed to reduce the rotational speed.
[0065]
Further, by providing the current sensor 114 on the power line, the power consumed by the unit can be calculated.
[0066]
Although the example in which the current sensor 114 is attached to the power supply line is shown in FIG. 1, the current sensor 114 may be disposed on the pattern of the control board in the control device.
[0067]
The detection value of the current sensor 114 enters the input unit 202 of the control device 201 and is calculated by the first microcomputer, and the power and the power consumption are displayed on the display unit 113 via the output unit 205.
[0068]
In the first embodiment, the first unit 102 and the second unit 103 are mounted on one refrigerator casing.
[0069]
When a plurality of cooling units are arranged in the same casing, for example, the total power becomes a problem.
[0070]
For example, normally, when the power outlet is an AC 100V system, the breaking current at the breaker is 15A. In other words, the breaker will fall if power from 1500 W is taken from one outlet.
[0071]
When a plurality of units are mounted in one housing as in the first embodiment and the compressors in the units are activated at the same time, the instantaneous power may exceed the breaker capacity, and the breaker is dropped. There is a case.
[0072]
In order to avoid such a phenomenon, a communication unit is provided in the control device of each unit so that the control devices can grasp each other's operation status.
[0073]
For example, when one of the compressors 4 is started, the communication unit 203 sends a start prohibition command to the other party's communication so that the other compressor 4 does not start. Continue to send to unit 203 for several minutes.
[0074]
By the communication means 115, it is possible to set restrictions on each other and realize stable operation.
[0075]
As described above, in the first embodiment, the cooling system including the compressor 4, the evaporator 1, the condenser 2, and the expansion means 5, and the wind that conveys the cold air generated in the evaporator 1. The evaporator fan motor 101 that sends the air, the condenser fan motor 3 that sends the air that cools the condenser 2, the outside air temperature sensor 104 that detects the outside air temperature, and the indoor temperature of the casing that is cooled by the cool air of the evaporator 1 And a control device for determining the operation of the compressor 4 of the cooling system based on the detection results of the outside air temperature sensor 104 and the inside temperature sensor 105. Yes, because it is established as a single unit as a cooling unit, for example, when designing a large refrigerator or the like, only the casing is designed, and a unit equipped with the above-mentioned units is installed in the casing as much as necessary. It can be made easily large refrigerator just go, correspondence can be easily model deployment.
[0076]
Furthermore, by using the compressor 4 as the inverter compressor and providing the control device 1 with the inverter control unit 206, the necessary refrigeration capacity can be obtained for each target casing to be cooled, and the refrigeration capacity can be adjusted according to load fluctuations in the casing. Can be varied.
[0077]
Furthermore, it is provided with an evaporator temperature sensor 111 for detecting the temperature of the evaporator and a condenser temperature sensor 110 for detecting the temperature of the condenser, and the operation status of the cooling unit can be grasped from the condensation temperature and the evaporation temperature. Therefore, operation outside the specified use range of the compressor can be avoided and the compressor can be protected.
[0078]
Furthermore, a dew prevention heater 112 is provided, and a function for controlling energization to the dew prevention heater 112 according to the detection result of the internal temperature sensor 105 and condensation in conjunction with the detection result of the condenser temperature detection sensor 110 are provided. By providing the control device 1 having a function of controlling the voltage applied to the fan motor 3 for equipment, unnecessary heater energization and fan drive can be suppressed, and the power consumption of the cooling unit can be reduced.
[0079]
Furthermore, the current sensor 114 is arranged on the power line, and the function of calculating the power consumption amount from the result of the current sensor 114 and displaying it so that it can be visually confirmed is provided, so that the user can recognize the electricity bill. .
[0080]
Furthermore, when a plurality of cooling units are mounted, each is connected by the communication means 115, and it is possible to provide a restriction for a phenomenon that requires a mutual restriction. For example, it is possible to avoid starting the compressor at the same time in order to prevent the breaker from falling.
[0081]
【The invention's effect】
As described above, the invention described in claim 1 includes a compressor, an evaporator, a condenser, a cooling system including expansion means, and an evaporator fan motor that conveys cold air generated in the evaporator. A cooling unit comprising a condenser fan motor for cooling the condenser, an outside air temperature sensor for detecting an outside air temperature where the housing is installed, and an internal temperature sensor for detecting the temperature inside the housing. In the provided housing, a refrigerator is formed by combining the cooling unit and the housing, and the operation range of the compressor of the cooling unit is determined based on the detection results of the outside air temperature sensor and the internal temperature sensor. It is equipped with a control device for determining, and can be easily developed.
[0082]
The invention according to claim 2 can be applied regardless of the type of model by using the compressor of the invention of claim 1 as an inverter compressor and providing the control device with an inverter controller.
[0083]
The invention according to claim 3 further includes an evaporator temperature sensor for detecting the temperature of the evaporator and a condenser temperature sensor for detecting the temperature of the condenser, in addition to the invention according to claim 1 or 2. Since the operation status of the refrigerator can be grasped from the condensation temperature and the evaporation temperature, the compressor can be protected.
[0084]
The invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising a dew prevention heater, wherein the dew prevention heater is provided according to a detection result of an internal temperature sensor. Power consumption can be reduced by providing a control device having a function of controlling the energization of the capacitor and a function of controlling the voltage applied to the condenser fan motor in conjunction with the detection result of the condenser temperature detection sensor.
[0085]
According to a fifth aspect of the present invention, in addition to the first aspect of the present invention, a current sensor is disposed on a power supply line, and a power consumption is calculated from a result of the current sensor. By providing the display function, energy saving can be enlightened to the user.
[0086]
The invention according to claim 6 is characterized in that, in the case where a plurality of cooling units are further mounted on the invention according to any one of claims 1 to 5, each is connected by a communication line, The operation status of each compressor can be grasped and the compressor operation drive can be managed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a refrigerator equipped with a cooling unit according to the present invention. FIG. 2 is a block diagram of a control apparatus according to the present invention. FIG. 3 is a diagram showing an example of a safe operation range of a compressor used in the present invention. [Figure] Diagram showing an example of the structure of a large refrigerator when a conventional cooling unit is used
DESCRIPTION OF SYMBOLS 1 Evaporator 2 Condenser 3 Condenser fan motor 4 Compressor 5 Expansion means 101 Evaporator fan motor 102 1st unit 103 2nd unit 104 External temperature sensor 105 Internal temperature sensor 106 Refrigerator case 107 Refrigeration room 108 Freezing room 109 Machine room 110 Condenser temperature sensor 111 Evaporator temperature sensor 112 Dew prevention heater 113 Power display means 114 Current sensor 115 Communication means

Claims (6)

A compressor, an evaporator, a condenser, a cooling system including expansion means, an evaporator fan motor that conveys cold air generated in the evaporator, and a condenser fan motor that cools the condenser A cooling unit equipped with a cooling unit, an outside air temperature sensor that detects an outside air temperature in which the housing is installed, and an internal temperature sensor that detects a temperature inside the housing. A refrigerator comprising a controller that determines an operating range of a compressor of the cooling unit based on detection results of the outside air temperature sensor and the internal temperature sensor by forming a refrigerator by combination. The refrigerator according to claim 1, wherein the compressor is an inverter compressor, and the control device includes an inverter control unit. 3. The refrigerator according to claim 1, further comprising an evaporator temperature sensor for detecting the temperature of the evaporator and a condenser temperature sensor for detecting the temperature of the condenser. A function to control the energization of the dew prevention heater according to the detection result of the internal temperature sensor and the application to the condenser fan motor in conjunction with the detection result of the condenser temperature detection sensor. The refrigerator according to any one of claims 1 to 3, further comprising a control device that controls the voltage. 5. The refrigerator according to claim 1, wherein a current sensor is disposed on a power line, a power consumption is calculated from a result of the current sensor, and a display function is provided. The refrigerator according to any one of claims 1 to 5, wherein when a plurality of cooling units are mounted, each is connected by a communication line.

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