JP3534635B2 - Inside / outside separation type air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor / outdoor separation type in which an indoor unit and an outdoor unit are connected to each other via an internal / external connection wire in a state where the indoor unit and the outdoor unit are separated from each other indoors and outdoors. The present invention relates to an air conditioner. 2. Description of the Related Art In recent years, in general homes, offices, and the like, indoor air conditioners have been used as air conditioners for adjusting and controlling, for example, the temperature of an atmosphere in an arbitrary range of the indoor space to a predetermined set temperature. 2. Description of the Related Art An internal / external separation type air conditioner in which an air conditioner and an outdoor unit are connected via an internal / external connection wire in a state where the air conditioner and the outdoor unit are separated from each other indoors and outdoors has been widely used, and the use contents thereof have also been diversified. As one of the contents used in such an inside / outside separation type air conditioner, there is a case where a cooling operation is performed even in winter when the outside air temperature is low. This is a room with excellent heat insulation structure that does not come into contact with the outside air, and in the case of a room with a heat source in it, for example, a computer room, a kitchen, a room where many people gather, etc. In rooms, cooling operation is required even in winter when the outside temperature is low. [0004] The conventional internal / external separation type air conditioner as described above will be described below with reference to the drawings. FIG. 3 is a sequence diagram schematically showing an electric circuit in the conventional inside / outside separated air conditioner, and FIG. 4 is a flowchart showing the operation of a control device in the conventional inside / outside separated air conditioner. . In FIG. 3, 1a is an indoor unit installed indoors, 2a is an outdoor unit installed outdoors, and 3 is an indoor unit 1a.
And a power supply for supplying power to the outdoor unit 2a;
An electronic control unit 5 provided on the side a is an indoor fan motor for blowing air indoors, 6 is an indoor fan motor control relay for controlling the start and stop of the operation of the indoor fan motor 5, and this control is performed by electronic control. This is performed according to an instruction from the device 4a. Reference numeral 7a denotes a compressor / outdoor fan motor control relay for controlling the operation of the compressor 11 and the outdoor fan motor 12, and this control is performed according to an instruction from the electronic control unit 4a. Reference numeral 10 denotes a temperature sensor.
The temperature of the indoor heat exchanger provided on the side a is detected and transmitted to the electronic control unit 4a. Reference numeral 11 denotes a compressor, and 12 denotes an outdoor fan motor. Both the compressor 11 and the outdoor fan motor 12 are provided on the side of the outdoor unit 2a. Stop is controlled. 13 is the indoor unit 1a from the power source 3.
And a power switch 15a, 16 for turning on / off the power supply to the outdoor unit 2a, and internal and external connection wires for electrically connecting the indoor unit 1a and the outdoor unit 2a. [0007] In the air conditioner of the inside / outside separation type configured as described above, since the cooling only model is originally designed to be operated in summer when the outside air temperature is high, when it is operated in winter when the outside air temperature is low. The following problems may occur. That is, when the outside temperature is low, the outdoor unit 2
The heat radiation effect of the outdoor heat exchanger provided on the side a is increased, the temperature of the outdoor heat exchanger is lowered, the refrigerant pressure inside is lowered, and the refrigerant pressure in the indoor heat exchanger on the indoor unit 1a side is also reduced, In the indoor heat exchanger, freezing may occur due to a decrease in the temperature. In this case, first, as shown in FIG. 3, a temperature sensor 10 for detecting the temperature is usually attached to the indoor heat exchanger on the indoor unit 1a side, as shown in FIG. As shown, when the power supply from the power supply 3 to the indoor unit 1a and the outdoor unit 2a is turned on by the power switch 13 (step 41), the compressor 11 and the outdoor unit are controlled by the compressor / outdoor fan motor control relay 7a. The fan motors 12 are both turned on to start the operation (step 42), and thereafter, when the temperature sensor 10 detects a certain temperature C from the decreasing temperature of the indoor heat exchanger (step 43), the compressor / outdoor fan motor Both the compressor 11 and the outdoor fan motor 12 are turned off by the control relay 7a to stop the operation (step 44), and control is performed to prevent the indoor heat exchanger from freezing. There is shall. In this case, after stopping the operation of the compressor 11 and the outdoor fan motor 12 for several minutes (for example, 7 minutes) when it is considered that the risk of freezing of the indoor heat exchanger disappears (step 4).
5), their operation is resumed (step 42). Second, a pressure switch and a temperature sensor are attached to the outdoor heat exchanger on the side of the outdoor unit 2, and the outdoor fan motor 12 during operation is stopped by using the pressure switch and the temperature sensor to prevent freezing of the indoor heat exchanger. Some control devices include a control device for controlling the operation. [0011] However, in the above-described conventional inside / outside separation type air conditioner, in the case of the first configuration, since the outside air temperature is low, the air conditioner is connected to the indoor unit 1a and the outdoor unit 2a. Immediately after the supply power is turned on, the temperature of the indoor heat exchanger falls, and the temperature sensor 10 quickly detects a constant temperature C from the indoor heat exchanger, and the compressor / outdoor fan motor control relay 7a Since the compressor 11 and the outdoor fan motor 12 are stopped quickly, there is a problem that the operation time of the compressor 11 is shortened and sufficient cooling performance cannot be exhibited. In the case of the second configuration, the outdoor unit 2a
Since the control device is also provided on the side, there is a problem that the configuration is complicated and the cost is increased. The present invention solves the above-mentioned conventional problems, and has a simple configuration without providing a control device on the outdoor unit side, is inexpensive, and prevents freezing of the indoor heat exchanger even at a low outdoor temperature. Provided is an internal / external separation type air conditioner capable of maintaining sufficient cooling capacity and improving cooling performance at low outside temperatures. [0014] In order to solve the above-mentioned problems, the air conditioner of the present invention is provided with a compressor for compressing air even when the outside air temperature is too low and the capacity of the outdoor heat exchanger becomes too large. By controlling the unit and the outdoor fan motor separately from the indoor unit side, it is possible to stop or intermittently operate the outdoor fan motor even during the compressor operation, thereby reducing the capacity of the outdoor heat exchanger and reducing its capacity. It is characterized in that an appropriate heat radiation performance of the outdoor heat exchanger is secured within an appropriate range regardless of the outside air temperature. As described above, it is possible to maintain a sufficient cooling capacity while preventing freezing of the indoor heat exchanger even at a low outdoor temperature, with a simple configuration without providing a control device on the outdoor unit side. Cooling performance at the time of outside temperature can be improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inside / outside separation type air conditioner according to a first aspect of the present invention is provided with an indoor unit installed indoors and an outdoor unit separated from the indoor units. An electronic control unit having an outdoor unit, wherein the indoor unit and the outdoor unit are connected by an internal / external connection electric wire, and controls a compressor and an outdoor fan motor provided on the outdoor unit side via the internal / external connection electric wire. In the indoor / outdoor separation type air conditioner dedicated to cooling provided on the indoor unit side, the inside / outside connection electric wire has a three-core structure, of which a first one core is a common line and a second one core is the electronic control unit. a control line for operation start and stop of the compressor to be carried out as a control by, a third control line for operation start and stop of the outdoor fan motor to be performed one core as the control by the electronic control device use,
Controlling the electronic control unit separately and independently of the compressor and the outdoor fan motor via the internal and external connection wires ;
For the compressor and the outdoor fan motor,
Do not start at the same time
After a fixed time, the operating current of the compressor has exceeded a certain value.
At the time of starting the operation of the outdoor fan motor
Control, the compressor starts operation, and after a certain period of time
When the operating current exceeds a certain value, the outdoor fan motor
After starting operation, the indoor heat exchanger of the indoor unit side
When the temperature is detected and the temperature falls below the first temperature
Stops the operation of the outdoor fan motor and
The temperature of the heat exchanger is raised to a temperature equal to or higher than the first temperature.
If the temperature is equal to or higher than the second temperature, the outdoor fan
The outdoor fan is controlled to restart the operation of the motor.
Even after stopping the motor, the temperature of the indoor heat exchanger
If the temperature continues to fall, the temperature is below the first temperature
When the temperature of the compressor becomes equal to or less than the third temperature, the operation of the compressor
Is also controlled to stop.
You. According to this configuration, even when the outside air temperature is too low and the capacity of the outdoor heat exchanger becomes too large, the compressor and the outdoor fan motor are controlled separately from the indoor unit side so that the compressor can be operated during the operation. It is also possible to stop or intermittently operate the outdoor fan motor, reduce the capacity of the outdoor heat exchanger, and set its capacity to an appropriate range regardless of the outside temperature,
Ensure the optimal heat radiation performance of the outdoor heat exchanger. [0018] Further, by increasing quickly discharge pressure of the compression unit a time low outside air temperature, thereby enabling rapid rise of early to cooling capacity of the heat of the compressor, the operation of the compressor When the compressor is started, current detection is not performed for a certain period of time with respect to a large starting current that flows instantaneously at the time of starting, so that a situation in which the outdoor fan motor starts operating due to erroneous detection of the starting current is avoided. [0020] Further, after from the start is operated, while detecting the temperature of the indoor heat exchanger, the temperature of the indoor heat exchanger the
When the temperature becomes equal to or lower than 1, the operation of the outdoor fan motor is stopped or dropped to increase the discharge pressure of the compressor, thereby making it possible to increase the temperature of the indoor heat exchanger. Further , even when the temperature of the indoor heat exchanger is adjusted by controlling the outdoor fan motor to detect a decrease in the temperature of the indoor heat exchanger and increase the temperature, the temperature of the indoor heat exchanger continues to decrease. In this case, the compressor is also stopped to prevent freezing of the indoor heat exchanger. Hereinafter, an internal / external separation type air conditioner showing an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a sequence diagram schematically showing an electric circuit in the inside / outside separation type air conditioner of the present embodiment. Note that the same reference numerals are given to those which operate in the same manner as in FIG. 3 showing the prior art, and they are commonly referred to in specific description. In FIG. 1, 1b is an indoor unit installed indoors, 2b is an outdoor unit installed outdoors, and 3 is an indoor unit 1b
And a power supply for supplying power to the outdoor unit 2b, and 4b is the indoor unit 1
An electronic control unit 5 provided on the side b is an indoor fan motor for blowing air indoors, 6 is an indoor fan motor control relay for controlling the start and stop of the operation of the indoor fan motor 5, and this control is performed by electronic control. This is performed according to an instruction from the device 4b. Reference numeral 7b denotes a compressor control relay for controlling the operation of the compressor 11, and this control is performed according to an instruction from the electronic control unit 4b. Reference numeral 8 denotes an outdoor fan motor control relay for controlling the operation of the outdoor fan motor 12, and this control is performed according to an instruction from the electronic control unit 4b.
(The compressor control relay 7b and the outdoor fan motor control relay 8 are shown in FIG.
One relay is also used as the outdoor fan motor control relay 7a), and 9 is a CT transformer, which detects a current flowing through the compressor 11 and transmits it to the electronic control unit 4b. A temperature sensor 10 detects the temperature of an indoor heat exchanger provided on the indoor unit 1b side and transmits the detected temperature to the electronic control unit 4b. Reference numeral 11 denotes a compressor, which is provided on the outdoor unit 2b side, and its operation start and stop are controlled by a compressor control relay 7b. 12 is an outdoor fan motor,
The start and stop of the operation are controlled by an outdoor fan motor control relay 8 provided on the outdoor unit 2b side. 1
Reference numeral 3 denotes a power switch for turning on / off a power supply from the power supply 3 to the indoor unit 1b and the outdoor unit 2b;
Reference numeral 6 denotes an inside / outside connection electric wire for electrically connecting the indoor unit 1b and the outdoor unit 2b. FIG. 2 is a flowchart showing the operation of the control device in the inside / outside separation type air conditioner of the present embodiment. In this indoor / outdoor separation type air conditioner, as shown in FIG. 2, when the power supply from the power supply 3 to the indoor unit 1b and the outdoor unit 2b is turned on by the power switch 13, and an operation signal is input (step 21). Then, the indoor fan motor control relay 6 and the compressor control relay 7b are turned on, and the indoor fan motor 5 and the compressor 11 start operating (step 22). Next, after a lapse of time (usually within 1 to 2 seconds) in which the starting current of the compressor 11 flows (step 2).
3) The detection of the current of the compressor 11 is started by the CT transformer 9, and the current value of the compressor 11 is set to a certain value by utilizing the relationship that the operating current increases when the discharge pressure of the compressor 11 increases. When (A) is reached (step 24), the outdoor fan motor control relay 8 operates, the outdoor fan motor 12 starts operating, and normal operation starts (step 25). From this time, a signal from the temperature sensor 10 attached to the indoor heat exchanger enters the electronic control unit 4b, and when the temperature of the indoor heat exchanger falls below the freezing limit temperature (C) (step 26), the electronic control unit 4b turns off the outdoor fan motor control relay 8, whereby the outdoor fan motor 12 stops (step 27). afterwards,
Further, when the temperature of the indoor heat exchanger falls and becomes equal to or lower than the predetermined temperature (B) (step 28), the electronic control unit 4b turns off the compressor control relay 7b, and thereby the compressor 11
Stops for a fixed time (for example, 7 minutes) (step 29)
However, when the temperature of the indoor heat exchanger becomes equal to or higher than the predetermined temperature (D) (step 30), the outdoor fan motor control relay 8 is turned on again, and the outdoor fan motor 12 starts operating (step 25). The above control is repeated until the operation returns to the normal operation and the operation stop signal is received. Here, the set temperatures B, C, and D have a relationship of B ≦ C ≦ D. As described above, even when the outside air temperature is low and the capacity of the outdoor heat exchanger becomes too large, the compressor 11 and the outdoor fan motor 12 are separately controlled from the indoor unit 1b by the electronic control unit 4b. By doing so, the compressor 11
It is possible to stop or intermittently operate the outdoor fan motor 12 even during the operation of the air conditioner, to narrow down the capacity of the outdoor heat exchanger, to set the capacity to an appropriate range irrespective of the outside temperature, and to set the optimum outdoor heat exchanger. Heat radiation performance can be ensured. Therefore, it is possible to maintain a sufficient cooling capacity while preventing the indoor heat exchanger from freezing even at a low outdoor temperature, with a simple configuration without providing a control device on the outdoor unit 2b side. Cooling performance at the time of outside temperature can be improved. In the electronic control unit 4b,
For example, even if the outside temperature is low, after the driving signal is received,
Since only the compressor 11 and the indoor fan motor 5 are operated and the outdoor fan motor 12 is stopped, the heat of the compressor 11 is not radiated, and the rise of the discharge pressure of the compressor 11 is accelerated. As a result, the function of the compressor 11 starts up quickly, and the cooling capacity is quickly obtained. Furthermore, the temperature of the indoor heat exchanger is monitored, and when the temperature reaches just before freezing, the outdoor fan motor 12 is stopped, so that the discharge pressure of the compressor 11 increases, and the temperature of the indoor heat exchanger is also reduced by the action. It is also possible to prevent the indoor heat exchanger from rising and freezing. Further, even if the outdoor fan motor 12 is stopped, if the temperature of the indoor heat exchanger decreases due to the strong wind blowing outside and the wind circulating through the outdoor heat exchanger, etc. Since the freezing of the indoor heat exchanger can be prevented by stopping the compressor 11, it is possible to prevent water leakage from the indoor unit 1b and a decrease in cooling performance. As described above, according to the first aspect of the present invention, even if the outdoor temperature is too low and the capacity of the outdoor heat exchanger becomes too large, the compressor and the outdoor fan motor can be connected. By controlling separately from the indoor unit side, it is possible to stop or intermittently operate the outdoor fan motor even during the compressor operation, reduce the capacity of the outdoor heat exchanger, and adjust its capacity to an appropriate value regardless of the outside temperature. Within this range, optimum heat radiation performance of the outdoor heat exchanger can be ensured. Therefore, it is possible to maintain a sufficient cooling capacity while preventing the indoor heat exchanger from freezing even at a low outdoor temperature, with a simple configuration without providing a control device on the outdoor unit side. Cooling performance at the time of temperature can be improved. Further, by increasing quickly discharge pressure of the compression unit a time of low outside air temperature, fast as well as allow the rise of and fast heating of the compressor cooling capacity, the moment when the operation start of the compressor When the compressor is started, current detection is not performed for a certain period of time with respect to a large starting current flowing continuously, so that it is possible to avoid a situation in which the outdoor fan motor starts operating due to erroneous detection of the starting current. Therefore, it is possible to prevent the failure of the refrigeration cycle parts due to the return of the liquid to the compressor. Further, after from OPERATION it is started, while detecting the temperature of the indoor heat exchanger, the temperature of the indoor heat exchanger the
When the temperature becomes equal to or lower than 1, the operation of the outdoor fan motor is stopped or dropped to increase the discharge pressure of the compressor, thereby making it possible to increase the temperature of the indoor heat exchanger. Therefore, even at a low outdoor temperature, freezing of the indoor heat exchanger can be avoided without stopping the cooling capacity. Further, even when adjusting the temperature of the indoor heat exchanger by controlling the outdoor fan motor to detect the lowering of the temperature of the chamber within the heat exchanger to increase its temperature, if continuing to further descend The compressor can also be stopped to prevent the indoor heat exchanger from freezing. Therefore, the freezing of the indoor heat exchanger can be prevented in response to any outside air condition, and the occurrence of complaints such as water leakage can be eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sequence diagram schematically showing an electric circuit in an inside / outside separation type air conditioner according to an embodiment of the present invention. FIG. 2 is a control in the inside / outside separation type air conditioner according to the embodiment. FIG. 3 is a flowchart showing an operation of the apparatus. FIG. 3 is a sequence diagram showing an outline of an electric circuit in the conventional inside / outside separation type air conditioner. FIG. 1b Indoor unit 2b Outdoor unit 3 Power supply 4b Electronic control unit 5 Indoor fan motor 6 Indoor fan motor control relay 7b Compressor control relay 8 Outdoor fan motor control relay 9 (for compressor current detection) CT transformer 10 Temperature sensor 11 (for detecting the temperature of the indoor heat exchanger) Compressor 12 Outdoor fan motor 13 Power switch 14, 15b, 1 Inside and outside connection wires

Continuation of front page (56) References JP-A-59-231344 (JP, A) JP-A-7-243690 (JP, A) JP-A-50-117049 (JP, A) JP-A-6-281273 (JP, A) JP-A-6-313609 (JP, A) JP-A-7-19532 (JP, A) JP-A-3-175230 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) F24F 11/02 102

Claims (1)

(57) [Claim 1] An indoor unit installed indoors, and an outdoor unit installed outdoors while being separated from the indoor unit,
The indoor unit and the outdoor unit are connected by an indoor / outdoor connection wire, and an electronic control device for controlling a compressor and an outdoor fan motor provided on the outdoor unit side via the inside / outside connection wire is provided on the indoor unit side. In the air conditioner for air conditioning only for cooling, the inner and outer connection wires have a three-core structure, of which the first core is a common line and the second core is controlled by the electronic control unit. The third control unit is used for a control line for starting and stopping operation of the outdoor fan motor, and a third core is used for a control line for starting and stopping operation of the outdoor fan motor performed as control by the electronic control unit. and the compressor and the outdoor fan motor controlled separately and independently through the internal and external connection wires, said compression
And their operation with respect to the outdoor fan motor
Do not start at the same time, for a certain period of time
Later, when the operating current of the compressor exceeds a certain value
Control to start the operation of the outdoor fan motor with
Then, the compressor starts operation, and after a certain time,
When the current exceeds a certain value, the outdoor fan motor
After starting the rotation, the temperature of the indoor heat exchanger on the indoor unit side
Is detected, and when the temperature falls below the first temperature,
The operation of the outdoor fan motor is stopped to stop the indoor heat exchanger.
Temperature, and when the temperature is equal to or higher than the first temperature
If the temperature exceeds a certain second temperature, the outdoor fan motor
Control to restart the operation of the outdoor fan motor.
The temperature of the indoor heat exchanger further decreases even after the
If the temperature continues, the temperature is lower than the first temperature.
When the temperature falls below the third temperature, the operation of the compressor is also stopped.
An inside / outside separation type air conditioner , characterized in that it is controlled to stop .