JPH0942786A - Control device of cooling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of a cooling apparatus in which its wiring can be simplified even in case that an operation control for a blower for a condensor in correspondence with a state of control of supplying refrigerant to a cooling device is performed and further a workability during its installing operation may also be improved. SOLUTION: A control section 2 controls a supplying of refrigerant to a cooling device in response to an output of a cooling temperature sensor 4 and further controls an operation of a motor 8 for a condensor blower in response to an output of a condensor temperature sensor 7. The control section 2 performs an operation control for the motor 8 in response to a controlling state for supplying refrigerant to the cooling device in preference to a control performed in reference to an output of the condensor temperature sensor 7 and concurrently this control section 2 is arranged at one of either a cooling system R or a condensing system C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a cooling unit equipped with a cooler and a condensing unit equipped with a condenser and a fan for the condenser, and operates the fan for the condenser based on the temperature of the condenser. The present invention relates to a control device for a cooling device that is controlled.

[0002]

2. Description of the Related Art Heretofore, a cooling device of this type has a refrigerating cycle composed of a compressor, a condenser, a cooler and the like, as shown in, for example, Japanese Unexamined Patent Publication No. 7-71856 (F25D17 / 06) as a low temperature showcase. The cool air cooled by the cooler is circulated in the refrigerator by the cooling blower to cool it. Further, the condenser is normally air-cooled by a condenser blower to radiate and condense the high-temperature and high-pressure refrigerant discharged from the compressor. The controller controls the operation of the compressor and the cooling blower based on the output of the sensor that detects the internal temperature.

On the other hand, in a large-scale equipment such as a prefabricated refrigerator / refrigerator, the control device as described above has conventionally been constructed as shown in FIG. That is, the conventional control device 101 will be described with reference to FIG. Here, prefabricated refrigeration not shown
A refrigerator is provided with a cooling unit inside the refrigerator, and a condenser is provided outside the refrigerator with a condenser, a blower for the condenser, and a compressor. The cooler and the cooler are connected by piping so as to form a known refrigeration cycle together with the decompression device.

[0006] In this case, the cooling unit and the condensing unit are installed at a position (outdoor) where the condensing unit is separated from the cooling unit, and an integrated type in which one heat insulating wall (heat insulating panel) is integrated. There is a separate type. The conventional control device 101 is provided on the cooling unit side, and is provided on the cooler side control unit 102 composed of a general-purpose microcomputer, and the discrete electric circuit provided on the condensing unit side and composed of a comparator and the like. Condenser side control unit 103
It is composed of A cooling temperature sensor 104 for detecting the temperature inside the prefabricated freezer / refrigerator is connected to the input of the cooler-side control unit 102, and an electromagnetic valve 106 for controlling the refrigerant supply to the cooler is connected to the output. .

On the other hand, a condenser temperature sensor 107 for detecting the temperature of the condenser and a motor 108 for driving the condenser blower are connected to the condenser side controller 103. With the above configuration, the cooler-side control unit 102 operates as the cooling temperature sensor 10
The solenoid valve 106 is controlled to open and close based on the temperature inside the refrigerator detected by 4. Now, assuming that the internal temperature is sufficiently high, the solenoid valve 106 is opened. In this state, the high temperature and high pressure gas refrigerant discharged from the compressor flows into the condenser to radiate heat,
After being condensed, it flows into a cooler through a decompression device (not shown). The refrigerant that has flowed into the cooler evaporates and exerts a cooling action, but the cool air that has exchanged heat with the cooler is circulated in the refrigerator by a cooling blower (not shown) to cool the inside.

When the temperature inside the refrigerator drops to the set temperature due to such cooling, the cooler-side controller 102 closes the solenoid valve 106 based on the output of the cooling temperature sensor 104. When the electromagnetic valve 106 is closed, the suction side pressure of the compressor drops and the compressor stops. When defrosting the cooler, by bypassing the decompression device and supplying high-temperature refrigerant (hot gas) to the cooler to heat the cooler to defrost (hot gas defrost), The control of defrosting by forcibly stopping the supply of the refrigerant to the cooler (off-cycle defrosting) has been performed.

On the other hand, the condenser side control unit 103 controls the operation of the motor 108 based on the output of the condenser temperature sensor 107. That is, when the temperature of the condenser rises, the number of rotations of the motor 108 of the condenser blower is increased, and the control is performed to reduce the number of rotations as the temperature of the condenser drops, thereby maintaining a required condensing capacity. Was said.

[0008]

As described above, in the conventional control device 101, the motor 108 is controlled only by the temperature of the condenser.
However, depending on the state of the cooler, in particular, the control state of the refrigerant supply such as cooling or defrosting, the motor 1
If the operation of 08 is controlled, smoother and more accurate control can be realized. For example, while cooling with the cooler, the operation of the motor 108 is controlled by the temperature of the condenser,
When defrosting the cooler with hot gas, the motor 108 is forcibly operated regardless of the temperature of the condenser (full speed operation)
Alternatively, if the motor 108 is forcibly stopped when defrosting the cooler in the off cycle, it is possible to realize accurate defrost control that can also contribute to energy saving.

However, the conventional control unit 101 has a cooler side control unit 102 and a condenser side control unit 1 which are independent of each other.
Therefore, if the control as described above is to be realized, the cooler-side control unit 102 sends the electric current S1 of AC 100V to the condenser-side control unit 103, as shown by the broken line arrow in FIG. S2 (S1 is a cooling control power line (high-voltage wiring), S2 is a defrosting control power line (high-voltage wiring)), and the condenser side control unit 103 must be controlled by a relay or the like. As the circuit configuration becomes complicated and the high-voltage wiring must be installed through the wall especially in the separated type, the work by qualified personnel for electrical work is required, and the wiring work at the time of installation There was a problem that became complicated.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and wiring is performed even when the operation control of the blower for the condenser according to the control state of the refrigerant supply to the cooler is executed. It is an object of the present invention to provide a cooling device control device that can be simplified and improved in workability during installation.

[0011]

The control device of the present invention is used in a cooling device comprising a cooling unit having a cooler and a condensing unit having a condenser and a fan for the condenser. A condenser temperature sensor that detects the temperature of the condenser, a cooling temperature sensor that detects the temperature of the space to be cooled, and control the refrigerant supply to the cooler based on the output of this cooling temperature sensor. It is provided with a control means for controlling the operation of the condenser blower based on the output, and this control means has priority over the control by the output of the condenser temperature sensor and condenses in accordance with the refrigerant supply control state to the cooler. In addition to executing the operation control of the air blower, it is integrated in either the cooling unit or the condensing unit.

According to the control device of the cooling device of the second aspect of the invention, in addition to the above, the control means is provided on the cooling unit side, and the motor for driving the motor of the condenser blower based on the signal from the control means. The control element is provided on the condensing unit side. According to the control device of the cooling device of the present invention, the control means for controlling the supply of the refrigerant to the cooler based on the output of the cooling temperature sensor and for controlling the operation of the condenser blower based on the output of the condenser temperature sensor. The cooling unit or the condensing unit, and this control means gives priority to the control by the output of the condenser temperature sensor, and executes the operation control of the blower for the condenser according to the refrigerant supply control state to the cooler. Therefore, it is possible to simplify the wiring between the cooling unit and the condensing unit while realizing accurate control of the condenser blower according to the state of the cooling medium supply control to the cooler such as cooling or defrosting. This makes it possible to improve workability during installation.

According to the control device for the cooling device of the second aspect of the present invention, in addition to the above, the control means is provided on the cooling unit side, and the motor of the condenser blower is driven based on the signal from this control means. Since the motor control element is installed on the side of the condensing unit, the wiring between the cooling unit and the condensing unit can be only low-voltage signal lines, and workability during installation can be reliably simplified. It will be possible.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an electric circuit diagram of a control device 1 for a prefabricated refrigerator / freezer as an embodiment to which the present invention is applied. Here, a prefabricated freezer / refrigerator (not shown) is provided with a cooling unit R provided with a cooler provided at the top of the refrigerator, and a condenser, a blower for the condenser, and a compressor are provided outside the refrigerator on the ceiling wall. It is assumed that a condensing unit C including the above is provided, and these compressors, condensers, and coolers are connected by piping so as to form a well-known refrigeration cycle together with a decompression device.

The control device 1 is provided on the cooling unit R side and comprises a control unit 2 as a control means composed of a general-purpose microcomputer and a motor control element 3 provided on the condensing unit C side. Has been done. A cooling temperature sensor 4 for detecting a temperature inside the prefabricated freezer / refrigerator is connected to an input of the control unit 2, and an electromagnetic valve 6 for controlling a refrigerant supply to a cooler is connected to an output thereof.

Further, a condenser temperature sensor 7 for detecting the temperature of the condenser provided in the condensing unit C is connected to the input of the control section 2 by a low voltage signal line S3, and the output of the control section 2 Is connected to the motor control element 3 by a low voltage signal line S3. And
A motor 8 for driving the condenser blower is connected to the motor control element 3 by a high voltage signal line S4 such as AC 100V.

The motor control element 3 controls energization of the motor 8 based on a control signal from the control unit 2. In this case, the motor control element 3 determines the energization rate of the motor 8 (intermittent energization).
Is linearly changed from zero to a range including continuous energization. The operation will be described with the above configuration. First, the control unit 2 controls the opening / closing of the solenoid valve 6 based on the temperature inside the refrigerator detected by the cooling temperature sensor 4. Now, assuming that the internal temperature is sufficiently high, the solenoid valve 6 is opened. In this state, the high-temperature and high-pressure gas refrigerant discharged from the compressor flows into the condenser to radiate heat, is condensed, and then flows into the cooler via the pressure reducing device. The refrigerant that has flowed into the cooler evaporates and exerts a cooling action, but the cool air that has exchanged heat with the cooler is circulated in the refrigerator by a cooling blower (not shown) to cool the inside.

When the internal temperature drops to the set temperature due to such cooling, the control unit 2 closes the solenoid valve 6 based on the output of the cooling temperature sensor 4. When this solenoid valve 6 is closed,
The suction side pressure of the compressor provided on the condensing unit C side drops and the compressor stops. Further, when defrosting the cooler, for example, the decompression device is bypassed and a high-temperature refrigerant (hot gas) is supplied to the cooler to heat the cooler for defrosting. In this case, off-cycle defrosting may be performed in which the refrigerant supply to the cooler is forcibly stopped and defrosted.

Further, the control unit 2 sends a control signal to the motor control element 3 by the low voltage signal line S3 based on the output of the condenser temperature sensor 7 sent from the low voltage signal line S3,
As described above, the motor control element 3 controls the operation of the condenser blower motor 8. That is, during the cooling operation by the cooler, the control unit 2 increases the rotation speed of the motor 108 when the temperature of the condenser rises, and executes the control of decreasing the rotation speed as the temperature of the condenser drops. , Maintain the required condensation capacity.

On the other hand, when defrosting the cooler with hot gas, the control unit 2 forces the motor 8 to operate (full speed operation) regardless of the temperature of the condenser detected by the condenser temperature sensor 7. 2) to the motor control element 3. Thereby, the hot gas defrosting of the cooler can be smoothly realized. When defrosting the cooler in the off cycle, the control unit 2 sends a signal for forcibly stopping the motor 8 to the motor control element 3. Since the compressor is stopped during defrosting during off-cycle defrosting, cooling of the condenser is also unnecessary, which contributes to energy saving and enables accurate defrosting control as a whole.

Next, in the case of a separate type cooling device 1 in which the condensing unit C is installed at a position (outdoor) separated from the cooling unit R, as shown in FIG. The low voltage signal lines S3, S that are drawn out
3 and the low-voltage signal lines S3, S3 drawn from the condenser temperature sensor 7 and the motor control element 3 on the side of the condensing unit C (through the wall of the prefabricated refrigerator / refrigerator) may be connected by a connector or the like.

That is, since only the low-voltage signal line S3 is used for wiring at the time of installation work, the work required by a qualified person for electrical work, which has been conventionally required, is unnecessary. Although the control unit 2 is provided on the cooling unit R side in each of the above-described embodiments, the present invention is not limited to this, and the control unit 2 may be provided on the condensing unit C side and a control element for the solenoid valve 6 may be separately provided on the cooling unit R side. .

[0023]

As described above in detail, according to the present invention, the refrigerant supply to the cooler is controlled based on the output of the cooling temperature sensor, and the blower for the condenser is operated based on the output of the condenser temperature sensor. The control means for controlling the cooling unit or the condensing unit is integrated into the cooling unit or the condensing unit, and the control unit has priority over the control by the output of the condenser temperature sensor, and the blower for the condenser according to the refrigerant supply control state to the cooler. Since the operation control of the cooling unit and the condensing unit is performed accurately, the condenser blower can be controlled accurately according to the state of the cooling medium supply control such as cooling or defrosting to the cooling unit. Can be simplified, and workability at the time of installation can be improved.

According to the invention of claim 2, in addition to the above, a control means is provided on the cooling unit side, and a motor control element for driving the motor of the condenser blower based on a signal from this control means is provided. Since it is provided on the side of the condensing unit, it is possible to use only the low voltage signal line as the wiring between the cooling unit and the condensing unit.
The workability at the time of installation can be surely simplified.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a control device for an integrated cooling device as an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the separate type control device.

FIG. 3 is an electric circuit diagram of a conventional cooling device control device.

[Explanation of symbols]

 1 Control device 2 Control part 3 Motor control element 4 Cooling temperature sensor 6 Solenoid valve 7 Condenser temperature sensor 8 Motor C Condensing unit R Cooling unit S3 Constant voltage signal line

Claims (2)

[Claims] 1. A cooling device comprising a cooling unit having a cooler and a condensing unit having a condenser and a fan for the condenser, wherein a condenser temperature sensor for detecting the temperature of the condenser, A cooling temperature sensor for detecting the temperature of the space to be cooled, and controlling the supply of the refrigerant to the cooler based on the output of the cooling temperature sensor, and the operation of the condenser blower based on the output of the condenser temperature sensor. And control means for controlling the operation of the blower for the condenser according to the refrigerant supply control state to the cooler in preference to the control by the output of the condenser temperature sensor. At the same time, it is integrated into one of the cooling unit and the condensing unit, and a cooling device control device. 2. A control unit is provided on the cooling unit side, and a motor control element for driving a motor of the condenser blower based on a signal from the control unit is provided on the condensing unit side. Claim 1
Cooling system controller.