JP2009002537A - Control device of refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device of a refrigerating machine capable of controlling at least one or more compressors with high accuracy at low cost, in particular, controlling capacities of a wide variety of refrigerating machines with high accuracy. <P>SOLUTION: This control device 1 of the refrigerating machine 1 controls an operation of the compressor on the basis of a low pressure-side pressure of at least one or more compressors, and comprises a low pressure-side pressure setting operation means for setting a set value of a low pressure-side pressure of the compressor, a low-pressure pressure sensor 19 (low pressure-side pressure detecting means) detecting the low pressure-side pressure of the compressor, a control means executing the control of an operation of the compressor with a prescribed control pattern on the basis of the low pressure-side pressure of the compressor detected by the low-pressure pressure sensor 19 and the set value set by the low pressure-side pressure setting operation means, and a switching operation means for switching and setting the kind of a refrigerant used in a refrigerating cycle of the refrigerating machine, and the control means changes a range of pressure settable by the low pressure-side pressure setting operation means according to the kind of the refrigerant set by the switching setting means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control device that controls the operation of at least one compressor constituting a refrigeration cycle of a refrigerator.

  Conventionally, in a plurality of showcases installed in a store such as a supermarket, the inside of the store is cooled by a refrigerator, and the displayed products are kept at an appropriate temperature. In this refrigerator, a refrigerant cycle is composed of a compressor, a condenser, a decompression means, an evaporator, etc., and an evaporator is installed in each showcase, and the compressor is a showcase installed in a store. It is set separately.

  In particular, when the number of showcases is large, a plurality of (for example, 2 to 5) compressors are provided, and by increasing or decreasing the number of compressors operated according to the load of the showcase, The refrigeration capacity is controlled. Specifically, conventionally, pressure detection means (for example, a mechanical pressure switch) for detecting the pressure on the low pressure side (input side) is provided on the refrigerant suction side of each compressor, and is detected by the mechanical pressure switch. The operation of each compressor was controlled by the pressure on the low pressure side of each compressor, and the refrigeration capacity was appropriate.

  In recent years, electronic pressure switches are being used instead of mechanical pressure switches as such pressure detection means. That is, the mechanical pressure switch is low-cost, but the pressure setting is an analog scale adjustment using a driver or the like, so there is a problem that the setting is difficult and the accuracy is low. There was a shift to the use of electronic pressure switches. However, the control of the electronic pressure switch requires the use of a microcomputer and the number of electronic pressure switches required for the number of compressors, resulting in a problem that the cost is considerably higher than that of the mechanical type. It was.

  Therefore, in order to solve such a problem, the applicant applies detection means for outputting the refrigerant pressure on the low-pressure side of each compressor as a pressure signal, and the pressure signal and three preset ON / OFF set pressures. Based on the above, the four output modes are controlled by ON / OFF of two outputs, the compressor capacity is divided into two different groups, and compression of the first group is performed by ON / OFF of one of the two outputs. Developed a compressor control device equipped with control means for controlling the compressor and controlling the second group of compressors with the other output ON / OFF.

As a result, the compressor can be controlled at a low cost, and the pressure setting can be simplified (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2006-337022

  However, in order to control the compressor by the control device, it is necessary to replace at least a dedicated refrigerator equipped with the control device, and it is impossible to control the existing refrigerator.

  Therefore, the present invention has been made to solve the conventional problems of the prior art, and aims to control at least one compressor with high accuracy at low cost. It is an object of the present invention to provide a control device for a refrigerator that can accurately control the capacity of a refrigerator.

  That is, the control device for the refrigerator of the present invention controls the operation of the compressor based on the low pressure side pressure of at least one compressor constituting the refrigeration cycle of the refrigerator, Low pressure side pressure setting operation means for setting the set value of the side pressure, low pressure side pressure detection means for detecting the low pressure side pressure of the compressor, and the low pressure side pressure of the compressor detected by the low pressure side pressure detection means, Based on the setting value set by the low-pressure side pressure setting operation means, the control means for executing the operation control of the compressor with a predetermined control pattern and the type of refrigerant used in the refrigeration cycle of the refrigerator are switched. Switching operation means for changing the pressure range settable by the low pressure side pressure setting operation means in accordance with the type of refrigerant set by the switching setting means. .

  The control device for a refrigerator of the invention of claim 2 includes a transmission / reception means for transmitting / receiving data to / from an external higher-order control device, and the control means receives from the higher-order control device received via the transmission / reception means. Compressor operation control is executed based on the set value of the low-pressure side pressure in the control data.

  The control device for a refrigerator of the invention of claim 3 is a communication line connection capable of connecting two-wire and four-wire communication lines for transmitting and receiving data to and from the host controller in the invention of claim 2 And a switching operation means for switching the circuit depending on whether the communication line connected to the communication line connection unit is a two-wire type or a four-wire type.

  According to a fourth aspect of the present invention, there is provided a control device for a refrigerator, wherein the contact point controlled by the control means in the invention according to any one of the first to third aspects is connected in series with a low-pressure switch provided in the refrigerator. It is characterized by being.

According to the present invention, in the control device that controls the operation of the compressor based on the low pressure side pressure of at least one compressor constituting the refrigeration cycle of the refrigerator, the set value of the low pressure side pressure of the compressor is set. Low pressure side pressure setting operation means, low pressure side pressure detection means for detecting the low pressure side pressure of the compressor, low pressure side pressure of the compressor and low pressure side pressure setting operation means detected by the low pressure side pressure detection means Control means for executing compressor operation control in a predetermined control pattern based on the set values set in the above, and a switching operation means for switching and setting the type of refrigerant used in the refrigeration cycle of the refrigerator. And the control means changes the pressure range that can be set by the low pressure side pressure setting operation means in accordance with the type of refrigerant set by the switching setting means, and therefore controls a plurality of compressors with high accuracy. be able to. In particular, since compressors of other models can be connected, the capacity of an existing refrigerator that could not be controlled conventionally can be accurately controlled by the control device of the present invention. That is, the control device of the present invention is connected to an existing refrigerator. Since it is possible to accurately control the capacity of the existing refrigerator, it is possible to suppress the increase in cost as much as possible. And a control means for controlling the operation of the compressor based on the set value of the low pressure side pressure in the control data from the host controller received via the transmission / reception means. It is possible to centrally control the refrigerator that performs the operation.

  In addition, a communication line connection unit capable of connecting two-wire and four-wire communication lines for transmitting and receiving data to and from the host control device as in the invention of claim 3, and a connection to the communication line connection unit Switching control means for switching the circuit according to whether the communication line used is a two-wire type or a four-wire type, so that a host control having either a two-wire type or a four-wire type communication line is provided. Applicable to devices, and versatility can be improved.

  Furthermore, in the invention of claim 4, the contact controlled to be opened and closed by the control means in the invention of any one of claims 1 to 3, is connected in series with a low pressure switch provided in the refrigerator. Then, the existing low pressure switch of the refrigerator can be used as a fail safe, and the safety can be improved.

  The present invention aims to control at least one compressor with high accuracy at low cost, and in particular, to provide a control device for a refrigerator capable of accurately controlling the capacity of an existing refrigerator. It was made as a purpose. For the purpose of providing a control device for a refrigerator that accurately controls an existing refrigerator, a low pressure side pressure setting operation means for setting a set value of a low pressure side pressure of the compressor, and a low pressure side pressure of the compressor Compression with a predetermined control pattern based on the low pressure side pressure detection means for detecting the pressure, the low pressure side pressure of the compressor detected by the low pressure side pressure detection means, and the set value set by the low pressure side pressure setting operation means. Control means for executing the operation control of the machine, and switching operation means for switching and setting the type of refrigerant used in the refrigeration cycle of the refrigerator, the control means for the refrigerant set by the switching setting means This was realized by changing the pressure range that can be set by the low pressure side pressure setting operation means according to the type. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a refrigerant circuit diagram of a refrigerating cycle of a refrigerating machine according to an embodiment controlled by a refrigerating machine control apparatus according to the present invention, and FIG. 2 is a diagram showing an example of the arrangement of the refrigerating machine control apparatus according to the present invention. is there. This refrigerator is used for cooling the inside of a plurality of (two in FIG. 1) showcases 20. The refrigerator R of the present embodiment shown in FIGS. 1 and 2 is a refrigerator provided with two semi-hermetic compressors C1 and C2 having different outputs. The refrigerator R is installed in each showcase 20 and two compressors C1 and C2 with different outputs, a condenser (heat radiator) 13 that radiates the refrigerant compressed by the compressors C1 and C2, and so on. The refrigeration cycle is configured by connecting the expansion valves 16A and 16B, the evaporators 17A and 17B, and the like as the decompression means. Specifically, two different-output compressors C1 and C2 are connected in parallel to each other, and an oil separator 12 is provided on the refrigerant discharge side of each of the compressors C1 and C2. The oil separator 12 separates oil contained in the high-temperature and high-pressure refrigerant gas discharged from the compressors C1 and C2 and returns the oil to the compressors C1 and C2.

  Further, a condenser 13 is provided on the outlet side of the oil separator 12, and a liquid receiver 14 is further provided on the outlet side thereof. The liquid receiver 14 temporarily stores the refrigerant liquefied by the condenser 13 and stably supplies the liquid refrigerant to the expansion valves 16A and 16B and the evaporators 17A and 17B.

  The piping on the outlet side of the liquid receiver 14 branches and is connected to the inlets of the expansion valves 16A and 16B provided in the showcase 20 via the electromagnetic valves 15A and 15B, respectively. The pipes exiting the expansion valves 16A and 16B are connected to the inlets of the evaporators 17A and 17B. The pipes coming out of the evaporators 17A and 17B come out of the showcases 20 and merge, and then reach the gas-liquid separator 18. This gas-liquid separator 18 gas-liquid separates the refrigerant from each of the evaporators 17A and 17B installed in the showcase 20, returns only the gas content to the compressors C1 and C2, and each compressor C1, C2 This is to prevent the disadvantage of liquid compression.

  And the piping which exited the gas-liquid separator 18 branches, and is connected to the refrigerant | coolant suction side of compressor C1, C2, respectively. In FIG. 1, reference numeral 19 denotes a low pressure sensor of the control device 1. The low-pressure sensor 19 is a low-pressure sensor for detecting the refrigerant pressure on the low-pressure side of the compressors C1 and C2 on the refrigerant suction side of the compressors C1 and C2, and is connected to the control device 1 described later. Yes. In FIG. 1, reference numeral 29 denotes a high pressure sensor that detects the refrigerant pressure on the high pressure side of the compressors C <b> 1 and C <b> 2, and is connected to the control device 1 in the same manner as the low pressure sensor 19. In the refrigerator R of this embodiment, as shown in FIG. 2, a horizontal liquid receiver 14 is fixed on the unit base 3, and two compressors C <b> 1 and C <b> 2 compress the refrigerant above the liquid receiver 14. And a controller 5 as an existing control means are arranged in parallel. In the present invention, the controller 5 is connected to the control device 1 and executes operation control of the compressors C1 and C2 based on the output from the control device 1. That is, in this embodiment, the operation of the compressors C1 and C2 of the refrigerator R is substantially controlled by the control device 1, and the existing controller 5 is used as a part of the control device 1. It becomes. The controller 5 is configured by an electrical box 7 and has a control board inside.

  And on the side surface of the electrical box 7, high pressure switches H1, H2 and low pressure switches L1, L2 of the compressors C1, C2 provided in the existing refrigerator R are provided. Further, the oil separator 12 and the gas-liquid separator 18 described above are installed on the back side of the electrical box 7 (not shown in FIG. 2).

  On the other hand, the control device 1 of the present invention is installed on the side of the electrical box 7 (left side of the electrical box 7 in FIG. 2). The control device 1 is installed on a kit stand 6 that is anchored to the unit base 3 at four locations. The control device 1 has a built-in memory serving as a storage unit in which the number of compressors, the capacity of each compressor, or a plurality of control patterns corresponding to the number of compressors and each capacity are written. 3 is a front view of the control device 1, FIG. 4 is a side view (left side view), FIG. 5 is a plan view, FIG. 6 is a front view with the cover 35 of the main body 30 opened, and FIG. A part of the component layout of the disposed control board 37 is shown.

  The control device 1 has an outer casing constituted by an electrical box 33 constituted by a main body 30 having a vertically long rectangular shape and a top plate 32 attached above the main body 30. A cover 35 is attached to the front surface of the main body 30, and the inside is closed by the cover 35 so as to be opened and closed. A control board 37 is accommodated inside the main body 30.

  In FIG. 6, 3P2 is a wiring connection part of the low pressure sensor 19, 3P3 is a wiring connection part of the high pressure sensor 29, and 2P5 is an intake temperature sensor for detecting the refrigerant temperature on the suction side (suction side) of the compressors C1 and C2. 2P6 is a wiring connection part of a discharge temperature sensor (not shown) for detecting the refrigerant temperature on the discharge side of the compressors C1 and C2, and these are any kind of refrigerators. It is a wiring connection part that can be connected in common. The low pressure sensor 19 is connected to the refrigerator control device 1 of the present invention, and compressor operation control is executed based on the output of the low pressure sensor 19. The low pressure switches L1 and L2 used for the control are connected in series to the contacts that are controlled to be opened and closed by the control device 1 and used as a failsafe for low pressure.

  In FIG. 6, X1 to X8 are relays. In the control device 1 of the present embodiment, when controlling a multi-type refrigerator (multi-type refrigerator equipped with a compressor), X1 is an alarm relay (ON for contact opening, OFF for contact connection) X2 is a relay for stopping protection of the compressor (when ON, the contact is turned on, contacts are opened when OFF, and all the compressors are protected and stopped), X3 is a relay for stopping the oil back (when OFF) Contact conduction, ON opens the contact, liquid pipe solenoid valve is fully closed), X4 to X7 are capacity control relays for each compressor (ON is contact conduction, OFF is contact release), X8 is the condenser fan It shall be used as a full-speed relay (contact ON when ON, contact open when OFF).

  On the other hand, when controlling a refrigerator other than the multi system, X1 to X3 are relays that make the rotation speed of the condenser fan motor full speed (X1 and X3 are ON, the contact is open, OFF is the contact conduction, X2 is When ON, the contact is connected, and when OFF, the contact is opened), and X4 to X8 are used as capacity control relays of the compressors (contact connection when ON, contact open when OFF).

  Furthermore, when a multi-type refrigerator is used, 2P3 is used as a contact for temperature abnormality of the electrical box 33, and 2P4 is used as a contact for reset. Further, 3P1, 2P1 and 4P2 are 200V inputs. When a multi-type refrigerator is controlled, 3P1 is used as a reverse phase input, 2P1 is used as a defrosting input, and 4P2 is used as a nighttime input. Furthermore, 2P1 shall be used as various abnormal inputs of a refrigerator when controlling refrigerators other than a multi system.

  On the other hand, SW1 shown in FIGS. 6 and 7 is an automatic forced changeover switch SW3 for switching between a forced mode in which all compressors are stopped at a Lim value, which will be described later, and all compressors are operated at an ON value, and an automatic mode. A dip switch for mode switching, SW4 is a dip switch for model switching, SW6 and SW7 are setting operation switches, and these select one of the control patterns written in the memory of the control device 1. This is a selection operation means. Reference numeral 40 denotes a setting dial. In the automatic mode of the automatic forced changeover switch SW1, the energy saving mode for energy saving operation of the compressor, the high freshness mode for keeping the product in the showcase at high freshness, and the one system for controlling the operation of the compressor by one system. Either a mode or a night mode by an external input (in the control device 1 of this embodiment, the night mode is an operation mode applicable only to control of a multi-type refrigerator) can be selected.

  In addition, the switch SW3 of the embodiment is composed of eight dip switches that can be turned ON / OFF, and is used in a refrigerator type selection switch for communication control of a plurality of types of refrigerators and a refrigeration cycle of the refrigerator. A refrigerant selection switch or the like for switching and setting the type of refrigerant is provided.

  The switch SW4 is a refrigerator type selection switch for communication control of a plurality of types of refrigerators. The switch SW4 is composed of four DIP switches that can be turned ON / OFF, and compresses ON / OFF of each DIP switch. By operating as determined in advance according to the type, capacity, and number of units, each refrigerator can be controlled by the control device 1. Specifically, as shown in FIG. 8, the switch SW4 of this embodiment has ON / OFF of each dip switch determined in advance according to the type of the refrigerator, and 1 to 4 of SW4 as shown in FIG. By operating ON / OFF of the dip switch 4, the control device 1 can control the operation of the compressor of each refrigerator. In FIGS. 6 and 7, reference numeral 45 denotes a digital display unit (in the embodiment, 4-digit display is possible). The digital display unit 45 is display means for displaying each set value, operation mode, each temperature (compressor intake temperature and discharge temperature), failure content (error code), and the like.

  For example, when it is desired to display the operation mode, if the operation mode of the dial 40 is moved upward (the operation position shown in FIG. 7), the current operation mode is displayed on the digital display unit 45. “Eco” is displayed on the digital display unit 45 when the current operation mode is the energy saving mode, “Fre” is displayed in the high freshness mode, and “Sin” is displayed in the one system mode. When changing the operation mode, the operation mode can be set (changed) by operating the operation switches SW6 and SW7.

  Further, as shown in FIG. 7, when the dial 40 is operated so that the “operation” display is on the upper side, the low pressure side pressure of the refrigerant is displayed on the digital display unit 45, and the “high pressure” display on the dial 40 is displayed. If the operation is performed as described above, the high pressure side pressure detected by the high pressure sensor 29 is displayed on the digital display unit 45 in units of 0.01 MPa. Then, if the dial 40 is operated so that the “intake” display is on the upper side, the suction temperature of the refrigerant sucked into the compressor detected by the suction temperature sensor is displayed on the digital display 45 every 1 ° C. If the operation is performed so that “discharge” is at the top, the discharge temperature of the refrigerant discharged from the compressor detected by the discharge temperature sensor is displayed every 1 ° C.

  Further, if the dial 40 is operated so that the “failure history” display is on the top, the content of the failure is displayed as a code on the digital display unit 45. Specifically, when applied to a multi-type refrigerator, E00 is displayed on the digital display 45 when the cause of the abnormality is reverse phase, and E01, low pressure when the temperature is abnormal in the electrical box 33 The digital display section is E02 when the pressure abnormality is the cause, E04 for the compressor protection, E06 for the high pressure abnormality, E07 for the suction temperature abnormality, E040 for the discharge temperature abnormality, and E19 if any communication abnormality occurs. 45, respectively.

  On the other hand, when the control device 1 is applied to an existing refrigerator other than the multi system, E05 is caused by a low pressure abnormality, E06 is caused by a high pressure abnormality, E07 is caused by an intake temperature abnormality, E04 is caused by a discharge temperature abnormality, When a communication abnormality occurs, E19 is displayed on the digital display unit 45, respectively.

  In FIGS. 6 and 7, 51 is a warning lamp for blinking or lighting when a failure described later is displayed to indicate the occurrence of the failure, and 52 is each compressor when the relay coil of each compressor is ON. Compressor operation lamps for displaying that each is turned on, and 53 is a check lamp for displaying the operation of the board check program. This board check program is for checking the board when the operation is stopped. That is, the control board 37 can be checked by turning on SW2 when the normal operation is stopped. When the board check program is activated, “CHECK” is displayed on the digital display unit 45. Further, when this SW2 is turned ON during normal operation, that is, during normal operation, the board check cannot be performed and the operation is erroneous, and therefore an indication “−CH−” indicating that the setting is incorrect on the digital display unit 45. Is displayed (display for informing the user that the setting is incorrect and prompting the SW2 to be turned off).

  Further, 54 and 55 are pressure value display lamps for displaying the pressure value on the low pressure side, and 54 is a pressure value detected by the low pressure sensor 19 from a set value (within the range of ON value and OFF value described later). A HIGH lamp that is turned on when the pressure is high, and a LOW lamp 55 that is turned on when the pressure value detected by the low-pressure sensor 19 is lower than a set value (within an ON value and an OFF value described later). Reference numeral 56 denotes a defrost lamp that is turned on during the defrosting operation.

  Here, as described above, the control device 1 is written in the memory in accordance with the type of the refrigerator (the number of compressors and the capacity of each compressor, the number of compressors, the capacity of the compressor, or the like). The compressor operation control is executed via the controller 5 in any one of the control patterns selected by operating the switches (SW1, SW3, SW4, SW6, SW7) from the plurality of control patterns. Specifically, the control device 1 operates the compressor so that the low pressure detected by the low pressure sensor 19 in the control pattern is within a predetermined pressure range (within the range between the ON value and the OFF value). Step control.

  The ON value and OFF value of the low pressure are configured to be writable in the memory of the control device 1 depending on the use application of the refrigerator and the type of refrigerant. FIG. 9 shows an example of the ON value and the OFF value set according to the usage of the refrigerator and the type of refrigerant. For example, as shown in FIG. 1-no. 6 can be written in the memory, and the controller 1 selects the setting most suitable for the usage of the refrigerator and the type of refrigerant by operating the dial 40 and the operation switches SW6 and SW7. The possible pressure range (range between the ON value and the OFF value) is changed, and the operation of the compressor is controlled so as to be within the range between the ON value and the OFF value of the selected setting.

  Specifically, the operation is performed so that the display value of the dial 40 is on the upper side (the “standard pressure setting” display on the dial 40 is in the “operation” position shown in FIG. 7). The desired setting value no. Is selected by operating the operation switches SW6 and SW7 and displayed on the digital display unit 45. In this state, the dial 40 is operated to return the display of “RUN” to the original position (position shown in FIG. 7). The relevant no. The operation of the compressor is controlled with the ON value and OFF value stored in.

  Each no. When the ON value and the OFF value are written in (that is, when the initially set ON value and OFF value of each no. Are newly written and written), the dial 40 and the operation switches SW6 and SW7 are operated. It is possible to change. That is, the dial 40 and the operation switches SW6 and SW7 constitute the low pressure side pressure setting operation means of the present invention.

  Specifically, when the ON value of the pressure setting is written, the operation is performed so that the pressure setting ON of the dial 40 is on (the pressure setting ON is the “operation” position of the dial 40 shown in FIG. 7). As a result, the ON value of the current pressure setting is displayed on the digital display unit 45. Then, when the position of the dial 40 is left as it is (when the dial 40 pressure setting is on), the operation switches SW6 and SW7 are operated. By repeatedly operating the operation switch SW7 until the ON set pressure displayed on the display unit 45 reaches a desired value, the set value can be increased. When changing the ON pressure setting value, the dial 40 is left in the same position (the dial 40 pressure setting is ON), and the operation switch SW6 is set to a desired value. If the operation is performed up to, the set value can be lowered.

  On the other hand, when the OFF value of the pressure setting is written, an operation is performed so that the pressure setting OFF of the dial 40 comes up (the pressure setting OFF is the “operation” position of the dial 40 shown in FIG. 7), and the digital display The current OFF pressure setting value is displayed in the section 45. When the dial 40 is left in the same state (the dial 40 pressure setting is OFF), the operation switches SW6 and SW7 are operated, for example, when it is desired to increase the OFF pressure setting value, the digital display The set value can be increased by repeatedly operating the operation switch SW7 until the OFF set pressure displayed on the unit 45 reaches a desired value. Further, when changing the OFF pressure setting value to be changed, the position of the dial 40 is left as it is (the pressure setting of the dial 40 is OFF), and the operation switch SW6 is set to a desired value. If the operation is performed up to, the set value can be lowered.

  Further, the control device 1 classifies the zones into a plurality of zones according to the low pressure values detected by the low pressure sensor 19, and changes the switching time of each step according to the zone to which the low pressure values belong. Specifically, the zone has two zones (zone A and zone B) above the pressure value in the zone C range, with the range between the ON value and the OFF value of the set value being intermediate (zone C). Is set. Zone B is a pressure value that is equal to or higher than the ON value and is less than a predetermined value determined in accordance with the ON value (in this embodiment, (ON value +0.1) × 1.2−0.1). If the pressure value is higher than this value, it is classified as zone A.

  Further, two zones (zone D and zone E) are set below the pressure value in the zone C range. Zone D is a pressure value equal to or lower than the OFF value, and is a range higher than a predetermined value determined by the OFF value ((OFF value + 0.1) × 0.8−0.095 in this embodiment). When the pressure value is lower than this value, the zone E is classified. Then, the control device 1 divides the zone based on the detected low pressure, and further determines the step control method (number of steps, etc.) of the compressor capacity and the switching time of the step in consideration of the operation mode. Based on these, operation control of the compressor is performed. Furthermore, the pressure value (Lim value mentioned above) which stops all the compressors according to the kind of refrigerant to be used and the OFF value is determined. That is, the control device 1 stops the operation of all the compressors when the low pressure value detected by the low pressure sensor 19 decreases to this Lim value.

  Specifically, in this embodiment, when R22 is used as the refrigerant, that is, when the dip switch for selecting the type of refrigerant among the switches SW3 is switched to R22, the OFF value is 0.170 MPa. In the above case, the Lim value is 0.050 MPa, the OFF value is 0.100 MPa or more, and when it is less than 0.170 MPa, the pressure value is 0.030 MPa and the OFF value is less than 0.100. In some cases, it is set to -0.010 MPa.

  On the other hand, when R404A is used as the refrigerant (when the dip switch is switched to R404A) and the OFF value is 0.240 MPa or more, the Lim value is 0.090 MPa, and the OFF value is When the pressure value is 0.150 MPa or more and less than 0.240 MPa, 0.030 MPa, and when the OFF value is a pressure value less than 0.150, −0.010 MPa is set.

  Furthermore, the control device 1 of the present invention is provided with transmission / reception means for transmitting / receiving data to / from a master controller MC as an external host control device. In this embodiment, the control board of the control device 1 is provided. The external communication connection parts 5P1 and 5P2 provided in 37 correspond to transmission / reception means. The external communication connection portions 5P1 and 5P2 are provided with a plurality (five in each embodiment) of connection portions, and are configured to be connectable to two-wire and four-wire communication lines. Further, the control board 37 is provided with a changeover switch SW8 as a changeover operation means for changing over the circuit depending on whether the connected communication line is a two-wire type or a four-wire type. Specifically, in the control device 1 of the present embodiment, when connecting to a two-wire communication line, the second and third connection parts from the top of the external communication connection part 5P2 shown in FIG. By connecting the line SW and operating the changeover switch SW8, data is transmitted and received between the controller 1 and the master controller MC having a two-wire communication line. Based on the control data from the host controller The control pattern can be selected to control the compressor operation.

  When connecting to a master controller MC having a four-wire communication line, a connection unit other than the uppermost connection unit in the external communication unit 5P2 shown in FIG. By operating SW8, data is transmitted to and received from a master controller MC having a four-wire communication line, and a control pattern is selected based on control data from the master controller MC to control the operation of the compressor. Will be able to do.

  Next, the control operation of the refrigerator by the control device 1 of the present invention will be described.

(1) Multi-type (25 HP) refrigerator equipped with three compressors First, two compressors with the same output (for example, each output 10 HP) and these two compressors and one of the different outputs The control operation of a multi-type refrigerator equipped with a compressor (for example, output 5 HP) will be described with reference to FIG. In this case, the control device 1 performs six-step capacity control of the refrigerator. Further, the step transition time in each zone is determined by the operation mode as shown in FIG. Specifically, the operation of controlling the refrigerator in the energy saving mode will be described. The refrigerator 5 is equipped with a controller 5 as a control means for the existing refrigerator as in the refrigerator R shown in FIGS. 1 and 2, and the controller 1 compresses the controller 5 through the controller 5. It is assumed that the operation of the machine is controlled. In addition, it is assumed that each wiring of the refrigerator is correctly connected to the control board 37 of the control device 1.

  First, the user operates ON / OFF of the switch SW4 for model switching (that is, the multi 25HP in FIG. 8), the automatic forced switching switch SW1 is switched to the automatic mode, and the dial 40 and the operation switches SW6 and SW7 are switched. When the energy saving mode is selected, the control device 1 starts operation control of the compressor via the controller 5. When the refrigerator is connected, the control device 1 controls the compressor 6 steps. In the 6-step control, the operation of the three compressors is controlled according to the low-pressure side pressure, and the operation is changed to the 6-stage output. As shown in FIG. (Output 0 HP), Step 2 operates only the 5 HP compressor 3 (Output 5 HP), Step 3 operates only the 10 HP compressor 2 (Output 10 HP), and Step 4 operates the 5 HP compressor 3 and the 10 HP compressor 2 is operated (output 15 HP), 10 HP compressor 1 and compressor 2 are operated in step 5 (output 20 HP), and all compressors 1, 2 and 3 are operated in step 6 (output 25 HP). The compressor is operated and its capacity is controlled.

  Here, when the low pressure value detected by the low pressure sensor 19 enters the zone A during the operation in Step 4 (the compressor 2 and the compressor 3 are operating and the output is 15 HP), the control device 1 performs FIG. As shown in (1), a step-up signal is sent to the controller 5 to increase the output of the compressor by one step after one minute. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 5). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in the zone A, the controller 1 outputs the output of the compressor to the controller 5 after 1.5 minutes as shown in FIG. A step-up signal is sent to step up one step. As a result, the controller 5 increases the output of the compressor by one step (ie, shifts to step 6).

  On the other hand, when the low pressure value is reduced due to such an output increase and the zone C is a pressure value between the ON value and the OFF value, the control device 1 maintains the current output (no change shown in FIG. 11). Furthermore, when the low pressure value falls to zone D, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by one step after 40 seconds as shown in FIG. As a result, the controller 5 decreases the output of the compressor by one step (ie, shifts to step 5). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in zone D, the control device 1 reduces the compressor output to the controller 5 by one step after 40 seconds as shown in FIG. Send a step-down signal to As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 4).

  When the low pressure value detected by the low pressure sensor 19 falls to zone E, the control device 1 causes the controller 5 to step down the compressor output by two steps after 10 seconds as shown in FIG. Send. As a result, the controller 5 decreases the output of the compressor by two steps (ie, shifts to step 2). Further, when the low pressure value continues and is in zone E, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by two steps after 20 seconds as shown in FIG. With this signal, the controller 5 reduces the output of the compressor, and the operation of all the compressors is stopped (step 1). In any step, when the low pressure value detected by the low pressure sensor 19 is lowered to a predetermined Lim value, the control device 1 immediately stops all compressors in the controller 5. Thus, all the compressors are stopped (shift to step 1).

  On the other hand, when the low-pressure pressure value detected by the low-pressure sensor 19 rises to zone A while the entire compressor is stopped (ie, step 1), the controller 1 causes the controller 5 to move to the controller 5 after 1 minute as shown in FIG. A step-up signal is sent to increase the compressor output by one step. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2). On the other hand, when the low-pressure value rises to zone B while all the compressors are stopped, the controller 1 sends a step-up signal to the controller 5 to increase the compressor output by one step after 2 minutes as shown in FIG. Send. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2).

(2) Multi-type (30 HP) refrigerator equipped with three compressors with the same output Next, control of a multi-type refrigerator equipped with three compressors with the same output (for example, each output 10 HP) The operation will be described with reference to FIG. In this case, the control device 1 performs 4-step capacity control of the refrigerator. Further, the step transition time in each zone is determined by the operation mode as shown in FIG. Specifically, the operation of controlling the refrigerator in the high freshness mode will be described. The refrigerator 5 is equipped with a controller 5 as a control means for the existing refrigerator as in the refrigerator R shown in FIGS. 1 and 2, and the controller 1 compresses the controller 5 through the controller 5. It is assumed that the operation of the machine is controlled. In addition, it is assumed that each wiring of the refrigerator is correctly connected to the control board 37 of the control device 1.

  First, the user operates ON / OFF of the switch SW4 for model switching (that is, the multi 30HP in FIG. 8), the automatic forced switching switch SW1 is switched to the automatic mode, and the dial 40 and the operation switches SW6 and SW7 are switched. When the high freshness mode is selected, the control device 1 starts operation control of the compressor via the controller 5. When the refrigerator is connected, the control device 1 controls the compressor for four steps. In the 4-step control, the operation of the three compressors is controlled according to the low-pressure side pressure, and the operation is changed to the four-stage output. As shown in FIG. (Output 0 HP), Step 2 operates only one compressor 3 (Output 10 HP), Step 3 operates two compressors 2 and 3 (Output 20 HP), Step 4 includes all compressors 1, The operation and capacity control of the compressor are performed by operating 2 and 3 (output 30 HP).

  Here, when the low pressure value detected by the low pressure sensor 19 enters the zone A during the operation in Step 2 (only the compressor 3 is operated and the output is 10 HP), the control device 1 is as shown in FIG. After one minute, a step-up signal is sent to the controller 5 to increase the output of the compressor by one step. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 3).

  On the other hand, when the low pressure value decreases due to such an output increase and the zone C is a pressure value between the ON value and the OFF value, the control device 1 maintains the current output (no change shown in FIG. 13). Furthermore, when the low pressure value falls to zone D, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by one step after 40 seconds as shown in FIG. As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 2).

  Then, when the low pressure value detected by the low pressure sensor 19 falls to zone E, the control device 1 causes the controller 5 to step down the output of the compressor by one step after 10 seconds as shown in FIG. Send. As a result, the controller 5 decreases the output of the compressor by one step, and the operation of all the compressors is stopped (step 1). In any step, when the low pressure value detected by the low pressure sensor 19 is lowered to a predetermined Lim value, the control device 1 immediately stops all compressors in the controller 5. Thus, all the compressors are stopped (shift to step 1).

  On the other hand, if the low pressure value detected by the low pressure sensor 19 rises to zone A while the entire compressor is stopped (ie, step 1), the controller 1 immediately compresses the controller 5 as shown in FIG. A step up signal is sent to increase the machine output by one step. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2). On the other hand, when the low pressure value rises to zone B while the entire compressor is stopped, the controller 1 steps up to increase the compressor output by one step in the controller 5 after 1.5 minutes as shown in FIG. Send a signal. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2).

(3) Multi-type (36HP) refrigerator equipped with four compressors Next, two compressors each having the same output (for example, two compressors having an output of 10 HP and two compressors having an output of 8 HP) The control operation of a multi-type refrigerator equipped with a machine will be described with reference to FIG. In this case, the control device 1 performs six-step capacity control of the refrigerator. Further, the step transition time in each zone is determined by the operation mode as shown in FIG. Specifically, the operation of controlling the refrigerator in the night mode by external input (at night input shown in FIG. 11) will be described. In addition, the controller 5 as a control means of the existing refrigerator is attached to the refrigerator as in the above-described refrigerators, and the controller 1 controls the operation of the compressor via the controller 5. Will be described. In addition, it is assumed that each wiring of the refrigerator is correctly connected to the control board 37 of the control device 1.

  First, the user operates ON / OFF of the switch SW4 for model switching (that is, the multi 36HP in FIG. 8), the automatic forced switching switch SW1 is switched to the automatic mode, and at the same time the night mode by the external input from 4P2. Is selected, the control device 1 starts operation control of the compressor via the controller 5. When the refrigerator is connected, the control device 1 controls the compressor 6 steps. In the 6-step control, the operation of the four compressors is controlled according to the low-pressure side pressure, and the operation is changed to the 6-stage output. As shown in FIG. (Output 0 HP), step 2 operates only the 10 HP compressor 1 (output 10 HP), step 3 operates both the 8 HP two compressors 3 and the compressor 4 (output 16 HP), and step 4 operates 10 HP. Both of the two compressors 1 and 2 are operated (output 20 HP), and in step 5, the two compressors 3 and 4 of 8 HP and the one compressor 2 of 10 HP are operated (output 26 HP). In step 6, all the compressors 1, 2, 3, and 4 operate (output 36HP), so that the control device 1 performs compressor operation and capacity control.

  Here, when the low pressure value detected by the low pressure sensor 19 enters the zone A during the operation in Step 4 (both the compressor 1 and the compressor 2 are operated and output 20 HP), the control device 1 As shown in FIG. 11, after 2 minutes, a step-up signal is sent to the controller 5 to increase the output of the compressor by one step. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 5). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in the zone A, the control device 1 outputs the output of the compressor to the controller 5 after 2 minutes as shown in FIG. Send a step-up signal to step up. As a result, the controller 5 increases the output of the compressor by one step (ie, shifts to step 6).

  When the low pressure value becomes zone B due to such output increase, the control device 1 maintains the current output (no change shown in FIG. 11). In this night mode, when the low pressure value is in zone B, the control device 1 Similarly, the current output is maintained without changing the output.

  On the other hand, when the low pressure value drops to zone D, the control device 1 sends a step-down signal to the controller 5 to step down the compressor output by one step after 40 seconds as shown in FIG. As a result, the controller 5 decreases the output of the compressor by one step (ie, shifts to step 5). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in zone D, the control device 1 reduces the compressor output to the controller 5 by one step after 40 seconds as shown in FIG. Send a step-down signal to As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 4).

  On the other hand, when the low pressure value detected by the low pressure sensor 19 falls to zone E, the control device 1 causes the controller 5 to step down the compressor output by one step after 10 seconds as shown in FIG. Send. As a result, the controller 5 decreases the output of the compressor by one step (ie, shifts to step 3). Further, when the low pressure value continues and is in zone E, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by one step after 20 seconds as shown in FIG. With this signal, the controller 5 reduces the output of the compressor (shifts to step 2). In any step, when the low pressure value detected by the low pressure sensor 19 is lowered to a predetermined Lim value, the control device 1 immediately stops all compressors in the controller 5. Thus, all the compressors are stopped (shift to step 1).

  Further, when the low pressure value detected by the low pressure sensor 19 rises to the zone A while the entire compressor is stopped (that is, step 1), the control device 1 after 2 minutes as shown in FIG. A step-up signal is sent to increase the compressor output by one step. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2).

(4) Multi-type (40 HP) refrigerator equipped with four compressors of the same output Further, in a multi-type refrigerator equipped with four compressors of the same output (for example, each output 10 HP), FIG. As shown, the compressor operation is controlled in five steps. That is, in the 5-step control, the operation of the four compressors is controlled in accordance with the low-pressure side pressure and the operation is changed to the five-stage output. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 4 (output 10 HP), step 3 operates two compressors 3 and 4 (output 20 HP), and step 4 operates three units. The compressors 2, 3 and 4 are operated (output 30HP), and in step 5, the compressors are operated and the capacity is controlled by operating all the compressors 1, 2, 3 and 4 (output 40HP).

  Further, the step transition time in each zone is determined by the operation mode as shown in FIG. 13 as in the refrigerator (2). Specifically, the operation of controlling the refrigerator in the energy saving mode will be described. In addition, the controller 5 is attached to this refrigerator as the control means of the existing refrigerator similarly to each refrigerator mentioned above, and the control apparatus 1 controls the driving | operation of a compressor via this controller 5. FIG. It will be explained as a thing. Similarly, it is assumed that each wiring of the refrigerator is correctly connected to the control board 37 of the control device 1.

  First, the user operates ON / OFF of the switch SW4 for model switching (that is, the multi 40HP in FIG. 8), the automatic forced switching switch SW1 is switched to the automatic mode, and the dial 40 and the operation switches SW6 and SW7 are switched. When the energy saving mode is selected, the control device 1 starts operation control of the compressor via the controller 5.

  Here, when the low pressure value detected by the low pressure sensor 19 enters the zone B during the operation in Step 2 (only the compressor 4 is operated and the output is 10 HP), the control device 1 is 3 as shown in FIG. After a minute, a step-up signal is sent to the controller 5 to increase the output of the compressor by one step. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 3). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in the zone B, the control device 1 outputs the output of the compressor to the controller 5 after one minute as shown in FIG. Send a step-up signal to up. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 4).

  Further, when the low-pressure value detected by the low-pressure sensor 19 enters the zone A, the control device 1 sends a step-up signal to the controller 5 to increase the compressor output by one step after one minute as shown in FIG. Send. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 5).

  On the other hand, when the low pressure value decreases due to such an output increase and the zone C is a pressure value between the ON value and the OFF value, the control device 1 maintains the current output (no change shown in FIG. 13). Furthermore, when the low pressure value falls to zone D, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by one step after 40 seconds as shown in FIG. As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 4). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in zone D, the control device 1 reduces the compressor output to the controller 5 by one step after 40 seconds as shown in FIG. Send a step-down signal to As a result, the controller 5 decreases the output of the compressor by one step (ie, shifts to step 3).

  Then, when the low pressure value detected by the low pressure sensor 19 falls to zone E, the control device 1 causes the controller 5 to step down the output of the compressor by one step after 10 seconds as shown in FIG. Send. As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 2). Further, when the low pressure value continues and is in zone E, the controller 1 sends a step-down signal to the controller 5 to step down the output of the compressor by one step after 20 seconds as shown in FIG. With this signal, the controller 5 reduces the output of the compressor, and the operation of all the compressors is stopped (step 1).

  In any step, when the low pressure value detected by the low pressure sensor 19 is lowered to a predetermined Lim value, the control device 1 immediately stops all compressors in the controller 5. Thus, all the compressors are stopped (shift to step 1).

  On the other hand, when the low-pressure pressure value detected by the low-pressure sensor 19 rises to zone A while the entire compressor is stopped (ie, step 1), the controller 1 causes the controller 5 to move to the controller 5 after 1 minute as shown in FIG. A step-up signal is sent to increase the compressor output by one step. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2). On the other hand, when the low pressure value rises to zone B while the entire compressor is stopped, the controller 1 sends a step-up signal to the controller 5 to increase the compressor output by one step after 3 minutes as shown in FIG. Send. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2).

(5) Multi-type (65HP) refrigerator equipped with four compressors Next, two compressors with the same output (for example, output 20 HP), and one of these two compressors and a different output 16 (for example, 15 HP) and a multi-type refrigerator having a compressor (for example, 10 HP) having a different output from these compressors, the compressor operates as shown in FIG. Step controlled. That is, the 7-step control is to control the operation of the four compressors in accordance with the low-pressure side pressure and to change the output to seven stages of operation. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 4 (output 10 HP), step 3 operates only one compressor 2 (output 20 HP), step 4 includes two compressors 2 and Compressor 4 is operated (output 30 HP), two compressors 1 and 2 are operated (output 40 HP) in step 5, three compressors 1, 2, 4 are operated (output 50 HP) in step 6, In Step 7, the compressors are operated and the capacity is controlled by operating all the compressors 1 to 4 (output 65 HP).

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Specifically, the operation of controlling the refrigerator in the high freshness mode will be described. In addition, the controller 5 is attached to this refrigerator as the control means of the existing refrigerator similarly to each refrigerator mentioned above, and the control apparatus 1 controls the driving | operation of a compressor via this controller 5. FIG. It will be explained as a thing. Similarly, it is assumed that each wiring of the refrigerator is correctly connected to the control board 37 of the control device 1.

  First, the user operates ON / OFF of the switch SW4 for model switching (that is, the multi-65HP in FIG. 8), the automatic forced switching switch SW1 is switched to the automatic mode, and the dial 40 and the operation switches SW6 and SW7 are switched. When the high freshness mode is selected, the control device 1 starts operation control of the compressor via the controller 5.

  Here, when the low pressure value detected by the low pressure sensor 19 enters the zone B during the operation in Step 2 (only the compressor 4 is operated and the output is 10 HP), the control device 1 becomes 1 as shown in FIG. After 5 minutes, a step-up signal is sent to the controller 5 to increase the output of the compressor by one step. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 3). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in the zone B, the controller 1 sends the output of the compressor to the controller 5 after 1.5 minutes as shown in FIG. Send a step-up signal to step up one step. As a result, the controller 5 increases the output of the compressor by one step (that is, shifts to step 4).

  Further, when the low pressure value detected by the low pressure sensor 19 enters the zone A, the control device 1 sends a step-up signal to the controller 5 to increase the compressor output by two steps after one minute as shown in FIG. Send. As a result, the controller 5 increases the output of the compressor by two steps (that is, shifts to step 6).

  On the other hand, when the low pressure value is reduced due to such an output increase and the zone C is a pressure value between the ON value and the OFF value, the control device 1 maintains the current output (no change shown in FIG. 11). Furthermore, when the low pressure value falls to zone D, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by one step after 40 seconds as shown in FIG. As a result, the controller 5 decreases the output of the compressor by one step (ie, shifts to step 5). Further, when the low pressure value detected by the low pressure sensor 19 continues and is in zone D, the control device 1 reduces the compressor output to the controller 5 by one step after 40 seconds as shown in FIG. Send a step-down signal to As a result, the controller 5 decreases the output of the compressor by one step (that is, shifts to step 4).

  When the low pressure value detected by the low pressure sensor 19 falls to zone E, the control device 1 causes the controller 5 to step down the compressor output by two steps after 10 seconds as shown in FIG. Send. As a result, the controller 5 decreases the output of the compressor by two steps (ie, shifts to step 2). Further, when the low pressure value continues and is in zone E, the control device 1 sends a step-down signal to the controller 5 to reduce the output of the compressor by two steps after 20 seconds as shown in FIG. As a result, the controller 5 reduces the output of the compressor, and all the compressors are stopped (step 1).

  In any step, when the low pressure value detected by the low pressure sensor 19 is lowered to a predetermined Lim value, the control device 1 immediately stops all compressors in the controller 5. Thus, all the compressors are stopped (shift to step 1).

  On the other hand, if the low pressure value detected by the low pressure sensor 19 rises to zone A while the entire compressor is stopped (ie, step 1), the control device 1 immediately compresses the controller 5 as shown in FIG. A step up signal is sent to increase the machine output by two steps. As a result, the controller 5 increases the output of the compressor by two steps (shifts to step 3). On the other hand, when the low pressure value rises to zone B while the entire compressor is stopped, the control device 1 steps up to increase the output of the compressor by one step to the controller 5 after 1.5 minutes as shown in FIG. Send a signal. As a result, the controller 5 increases the output of the compressor by one step (shifts to step 2).

(6) Multi-type (70 HP) refrigerator equipped with four compressors Next, three compressors with the same output (for example, output 20 HP) and one compressor with a different output from these compressors In a multi-type refrigerator equipped with (for example, 10 HP), the operation of the compressor is controlled in eight steps as shown in FIG. That is, in the 8-step control, the operation of the four compressors is controlled in accordance with the low-pressure side pressure, and the operation is changed to the eight-stage output. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 4 (output 10 HP), step 3 operates only one compressor 3 (output 20 HP), step 4 includes two compressors 3 and Compressor 4 is operated (output 30 HP), two compressors 2 and 3 are operated at step 5 (output 40 HP), three compressors 2, 3, 4 are operated at step 6 (output 50 HP), In step 7, the three compressors 1 to 3 are operated (output 60 HP), and in step 8, all the compressors 1 to 4 are operated (output 70 HP), thereby operating the compressor and controlling the capacity.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted here.

(7) Multi-type (75HP) refrigerator equipped with four compressors Next, three compressors with the same output (for example, output 20 HP), and one compressor with a different output from these compressors In a multi-type refrigerator equipped with (for example, 15 HP), the operation of the compressor is controlled in five steps as shown in FIG. That is, in the 5-step control, the operation of the four compressors is controlled in accordance with the low-pressure side pressure, and the operation is changed to the five-stage output. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 4 (output 15 HP), step 3 operates two compressors 3 and 4 (output 35 HP), and step 4 operates three units. The compressors 2 to 4 are operated (output 55 HP), and in step 5, all the compressors 1 to 4 are operated (output 75 HP), thereby operating the compressor and controlling the capacity.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted here.

(8) Multi-type (80 HP) refrigerator including four compressors of the same output Further, in a multi-type refrigerator including four compressors of the same output (for example, output 20 HP), FIG. As shown, the compressor operation is controlled in five steps. That is, in the 5-step control, the operation of the four compressors is controlled in accordance with the low-pressure side pressure and the operation is changed to the five-stage output. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 4 (output 20 HP), step 3 operates two compressors 3 and 4 (output 40 HP), and step 4 operates three units. The compressors 2 to 4 are operated (output 60 HP), and in step 5, all the compressors 1 to 4 are operated (output 80 HP), thereby operating the compressor and controlling the capacity.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted here.

(9) Multi-type (85 HP) refrigerator equipped with five compressors Further, three compressors with the same output (for example, output 20 HP), one of these three compressors and one of the different outputs In a multi-type refrigerator equipped with a compressor (for example, output 15 HP) and one compressor (for example, output 10 HP) having a different output from these compressors, the operation of the compressor is performed as shown in FIG. Nine steps are controlled. That is, this 9-step control is to control the operation of five compressors according to the low-pressure side pressure and change them to nine-stage output. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 5 (output 10 HP), step 3 operates only one compressor 3 (output 20 HP), and step 4 includes two compressors 3 and The compressor 5 is operated (output 30 HP), the two compressors 2 and 3 are operated (output 40 HP) in step 5, and the three compressors 2, 3 and compressor 5 are operated (output 50 HP) in step 6. In step 7, the three compressors 1 to 3 having the same output are operated (output 60 HP), in step 8, the four compressors 1 to 3 and the compressor 5 are operated (output 70 HP), and in step 9, all compression is performed. Operate machine 1-5 (output 85HP) It is has been operating and capacity control of the compressor.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted here.

(10) Multi-type (90 HP) refrigerator equipped with five compressors Furthermore, four compressors with the same output (for example, output 20 HP), and one of these four compressors and a different output In a multi-type refrigerator having a compressor (for example, output 10 HP), the compressor operation is controlled by 10 steps as shown in FIG. That is, the 10-step control controls the operation of the five compressors according to the low-pressure side pressure and changes the operation to the output of 10 stages. As shown in FIG. Is stopped (output 0 HP), step 2 operates only one compressor 5 (output 10 HP), step 3 operates only one compressor 4 (output 20 HP), step 4 includes two compressors 4 and The compressor 5 is operated (output 30 HP), the two compressors 3 and 4 are operated (output 40 HP) in step 5, the three compressors 3 to 5 are operated (output 50 HP) in step 6, and the step 7 Then, three compressors 2 to 4 having the same output are operated (output 60 HP), four compressors 2 to 4 and the compressor 5 are operated (output 70 HP) in step 8, and four compressors having the same output are output in step 9. Operates compressors 1 to 4 (output 80 HP) In step 10 the total compressor 1-5 By operating (output 90hp), is performed operation and capacity control of the compressor.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted.

(11) Multi-type (95 HP) refrigerator equipped with five compressors Furthermore, four compressors with the same output (for example, output 20 HP), one of these four compressors and one of the different outputs In the multi-type refrigerator having the compressor (for example, output 15 HP), the compressor operation is controlled by 6 steps as shown in FIG. In this 6-step control, the operation of the five compressors is controlled according to the low-pressure side pressure, and the operation is changed to a six-stage output. As shown in FIG. (Output 0 HP), Step 2 operates only one compressor 5 (Output 15 HP), Step 3 operates two compressors 4 and 5 (Output 35 HP), Step 4 includes three compressors 3 to 5 (output 55 HP), in step 5 the four compressors 2 to 5 are operated (output 75 HP), and in step 6 all the compressors 1 to 5 are operated (output 95 HP). Operation and capacity control are performed.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted. Note that a multi-type refrigerator including five compressors with the same output is also controlled in five steps as in FIG.

(12) Multi-type refrigerator equipped with two different-output compressors Note that two different-output compressors (for example, the refrigerator R described in FIGS. 1 and 2 of the present embodiment (for example, In a multi-type refrigerator having an output 20HP compressor and an output 10HP compressor), the operation of the compressor is controlled in four steps as shown in FIG. In the 4-step control, the operation of the two compressors is controlled according to the low-pressure side pressure, and the operation is changed to the four-stage output. As shown in FIG. (Output 0 HP), Step 2 operates only the compressor 2 (Output 10 HP), Step 3 operates only the compressor 1 (Output 20 HP), and Step 4 operates both the compressors 1 and 2 (Output 30 HP). , Compressor operation and capacity control.

  In this case, the step transition time in each zone is determined by the operation mode as shown in FIG. Since the specific control operation is the same as that of each of the above refrigerators, the description is omitted.

(13) Multi-type refrigerator having two same-output compressors and three same-output compressors Further, a multi-type refrigerator having two same-output compressors (for example, output 10 HP) In the refrigerator, the compressor operation is controlled in three steps as shown in FIG. 24, and the step transition time in each zone is determined by the operation mode shown in FIG. Furthermore, in a multi-type refrigerator having three compressors with the same output (for example, output 10 HP), the operation of the compressor is controlled by four steps as shown in FIG. 25, and the step transition time in each zone is Similarly to the above, it is determined by the operation mode shown in FIG.

(14) Refrigerator consisting of one compressor (single model)
In the above (1) to (14), the control is performed for the refrigerator having a plurality of (2 to 5) compressors, but only one compressor is controlled by the control device 1 of the present invention. Of course, it is also possible. For example, in a refrigerator composed of a compressor with an output of 10 HP, control is performed as shown in FIG. 26, and the step transition time in each zone is determined by the operation mode shown in FIG.

  As described above in detail, the control device 1 of the present invention has a plurality of capacity control patterns, and can select these control patterns according to the number of compressors. Therefore, at least one compressor can be accurately selected. Can be controlled. In particular, even refrigerators of other companies with different control methods can be connected to the control device 1 of the present invention, and the control device 1 can accurately control the capacity. Furthermore, since the capacity of the existing refrigerator can be accurately controlled by connecting the control device 1 of the present invention to the existing refrigerator, an increase in cost can be suppressed as much as possible.

  In particular, a switching operation means for switching and setting the type of refrigerant used in the refrigeration cycle of the refrigerator, the low pressure side pressure setting operation means according to the type of refrigerant set by the switching setting means The settable pressure range can be changed.

  In addition, the existing low-pressure switch of the refrigerator can be used as a fail-safe by connecting the low-pressure switch provided in the existing refrigerator in series with the contact controlled by the control device 1 of the present invention. It is possible to improve safety.

  Furthermore, as described above, the control device 1 of the present invention includes transmission / reception means for transmitting / receiving data to / from the master controller MC as an external host control device. It is possible to select a control pattern based on control data from the host controller and execute compressor operation control. As a result, as shown in FIG. 27, by connecting the control device 1 of the present invention to a plurality of refrigerators, these can be centrally controlled by the master controller MC.

  In particular, by performing compressor operation control based on the set value of the low-pressure side pressure in the control data from the master controller MC received via the transmission / reception means, the centralized control of the refrigerator is performed with higher accuracy. It becomes possible.

  Furthermore, as described above, the control device 1 of the present invention includes a communication line connection unit that can connect two-wire and four-wire communication lines for transmitting and receiving data to and from the master controller MC, and this communication. By providing switching operation means for switching the circuit depending on whether the communication line connected to the line connection unit is a two-wire type or a four-wire type, either a two-wire type or a four-wire type communication is provided. It is possible to correspond to a host control device having a line. Thereby, versatility can further be improved.

It is a refrigerant circuit diagram of the refrigerator of one Example controlled by the control apparatus of the refrigerator of this invention. It is a figure which shows an example of arrangement | positioning of the control apparatus of the refrigerator of this invention. It is a front view of the control apparatus of FIG. It is a side view (left side view) of the control apparatus of FIG. It is a top view of the control apparatus of FIG. It is a figure which shows the state which opened the door of the control apparatus of FIG. FIG. 3 is a part of a component layout diagram of a control board of the control device of FIG. It is a figure which shows an example of ON / OFF operation of switch SW4 according to the model of the control apparatus of a present Example. It is a figure which shows an example of the ON value and OFF value which were written in the memory of the control apparatus of a present Example. It is a figure which shows the step control of the multi (25HP) compressor by the control apparatus of a present Example. It is a figure which shows the step transition time of each zone in each operation mode of a present Example. It is a figure which shows the step control of the multi (30HP) compressor by the control apparatus of a present Example. It is another figure which shows the step transition time of each zone in each operation mode of a present Example. It is a figure which shows the step control of the multi (36HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (40HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (65HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (70HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (75HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (80HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (85HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (90HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the multi (95HP) compressor by the control apparatus of a present Example. It is a figure which shows the step control of the compressor of different output 2 unit | multiplier by the control apparatus of a present Example. It is a figure which shows the step control of the compressor of the output 2 multi-unit by the control apparatus of a present Example. It is a figure which shows the step control of the compressor of the same output 3 unit multi by the control apparatus of a present Example. It is a figure which shows the step control of one compressor (single model) by the control apparatus of a present Example. It is an electric circuit diagram of an example when centralized control is performed by an external host control device using a plurality of control devices of the present invention.

Explanation of symbols

R refrigerator C1, C2 compressor 1 control device 3 unit pace 5 controller 6 kit stand 7 electrical box 12 oil separator 13 condenser (heat radiator)
14 Liquid receiver 15 Solenoid valve 16 Expansion valve (pressure reduction means)
17 Evaporator 18 Gas-liquid separator 19 Low-pressure sensor (low-pressure sensor)
20 Showcase 29 High pressure sensor 30 Main body 32 Top plate 33 Electrical box 35 Cover 37 Substrate part 40 Dial 45 Digital display part 5P1, 5P2 External communication connection part (transmission / reception means)
L1, L2 Low pressure switch SW1 to SW7 switch SW8 changeover switch (switching operation means for switching communication lines)

Claims (4)

In a control device for controlling the operation of the compressor based on the low-pressure side pressure of at least one compressor constituting the refrigeration cycle of the refrigerator,
Low pressure side pressure setting operation means for setting a set value of the low pressure side pressure of the compressor;
Low pressure side pressure detecting means for detecting the low pressure side pressure of the compressor;
Based on the low pressure side pressure of the compressor detected by the low pressure side pressure detection means and the set value set by the low pressure side pressure setting operation means, the operation control of the compressor is executed with a predetermined control pattern. Control means;
Switching operation means for switching and setting the type of refrigerant used in the refrigeration cycle of the refrigerator,
The control device for a refrigerator, wherein the control means changes a pressure range that can be set by the low pressure side pressure setting operation means in accordance with the type of refrigerant set by the switching setting means.   A transmission / reception unit for transmitting / receiving data to / from an external host controller, wherein the control unit sets a low-pressure side pressure in control data from the host controller received via the transmitter / receiver; The control device for a refrigerator according to claim 1, wherein operation control of the compressor is executed based on a value.   A communication line connection unit capable of connecting two-wire and four-wire communication lines for transmitting and receiving data to and from the host control device, and two communication lines connected to the communication line connection unit The control device for a refrigerator according to claim 2, further comprising switching operation means for switching a circuit according to whether the circuit is a four-wire system or a four-wire system.   The control device for a refrigerator according to any one of claims 1 to 3, wherein the contact controlled to be opened and closed by the control means is connected in series with a low pressure switch provided in the refrigerator.

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