JP3164630B2 - Operation control device of air conditioner equipped with refrigerant heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an air conditioner having a refrigerant heater for burning oil, which is mainly used at home.

[0002]

2. Description of the Related Art In recent years, air conditioners for heating a refrigerant have been developed, and those using oil as a heat source have been developed in addition to those using gas.

FIG. 4 is a refrigeration cycle diagram of an air conditioner provided with a conventional refrigerant heater. In the figure, 31 is a refrigerant heater, and 2 is a compressor. The refrigerant heated and evaporated by the refrigerant heater 31 is sent to the indoor heat exchanger 32 by the compressor 2, radiates and condenses to exhibit a heating capability, and then returns to the refrigerant heater 31 in a cycle.

FIG. 5 is a sectional view of a burner portion of a refrigerant heater using petroleum as a heat source. Here, the fan 46 is rotated by a motor 45 provided inside the burner main body 44, and the combustion air is sucked into the burner main body 44 from an air supply port 47 as shown by an arrow. On the other hand, the kerosene hits the atomizing vanes 49 provided coaxially with the fan 46 by the oil feed pipe 48 and scatters around due to centrifugal force. Here, since the vaporizer 50 is heated by the heater 5 and is kept at a high temperature, the scattered kerosene evaporates in the vaporizer 50 and mixes with the combustion air to be in a state where it is easy to burn. Then, after squirting from the flame hole plate 52, the igniter 53 ignites and burns.

With the above arrangement, in a conventional air conditioner equipped with a petroleum combustion type refrigerant heater, control is performed such that the heater inside the burner is energized in preparation for heating while operating the compressor. . Such an air conditioner is known, for example, from Japanese Patent Application Laid-Open No. 2-68443.

[0006]

However, in such a conventional configuration, when the compressor 5 is driven after the heater 5 is energized, the current capacity of the heater 5 and the compressor 2 is equal to the current capacity at home. May be exceeded. That is, at home, the current capacity is limited to 15 A or 20 A from the capacity of the outlet, and a special wiring work is required for an electric device larger than this, so that the capacity of the heater 5 cannot be increased.
For this reason, there is a drawback that it takes a long time to reach the oil combustion, and the rising of the heating is slow.

[0007] Accordingly, the present invention has been made in view of the above-mentioned drawbacks, and provides an air conditioner that can quickly start heating while satisfying the current capacity of a household outlet.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks, the present invention, as shown in the block diagram of FIG. 1, employs an air-fueled refrigerant heater and a variable displacement compressor. In the harmony machine, a combustion amount setting means for instructing a combustion amount necessary for heating, a compressor capacity setting means for instructing a necessary compressor capacity, and a capacity indicated by the compressor capacity setting means. A compressor driving means for driving the compressor, and a vaporizer temperature detecting means for detecting a temperature of a vaporizer for vaporizing fuel inside the refrigerant heater, and setting the detected vaporizer temperature. Vaporizer temperature comparing means for comparing the temperature with a value, vaporizer heater energizing means for energizing a heater for heating the vaporizer if the vaporizer temperature is lower than a set value, and burning when the vaporizer reaches a combustible temperature. Amount setting means Therefore, it is provided with combustion control means for performing combustion in accordance with the instructed combustion amount, and further compares a current detected by the current detection means with a set value and a current detection means for detecting an operation current of the compressor. Current comparing means; vaporizing heater energizing inhibiting means for inhibiting energization of the vaporizing heater when the current compared by the current comparing means is larger than a set value; and current of the compressor when energizing the vaporizing heater. Is larger than the set value, a capacity setting reducing means for reducing the capacity setting of the compressor.

[0009]

According to the configuration of the present invention described above, the operating current of the compressor is detected, and when the current value is large, the operating frequency of the compressor is reduced to reduce the set capacity, and after the operating current is reduced. The energization of the vaporization heater is performed.

[0010]

An embodiment of the present invention will be described with reference to the drawings. The air conditioner and its refrigerant heater have the same configuration as those in FIGS. 4 and 5 described in the conventional example.

FIG. 2 is an electric circuit diagram of an operation control device for an air conditioner according to one embodiment of the present invention. In FIG.
Is a detector of vaporizer temperature. A compressor 12 is driven by a power transistor 13. 14 is a compressor 12
Is a CT that detects the current value of the current. 15 is a vaporization heater,
The relay 16 is energized. Reference numeral 17 denotes a combustion controller, which is energized by a relay 18. Combustion controller 1
Reference numeral 7 basically consists of several functional components necessary for combustion, but since it is a generally well-known control unit, to start combustion when the relay 18 is energized to simplify the description. And Reference numeral 20 denotes a detector for detecting the room temperature, and reference numeral 21 denotes a variable resistor for setting the room temperature. Reference numeral 19 denotes a microcomputer to which the temperature detected by the vaporizer temperature detector 11 and the current value detected by the CT 14 are input, and the power transistor 13 and the relays 16 and 1 are input.
8 is driven.

Here, the correspondence between FIG. 2 and FIG. 1 will be described. The vaporizer temperature detector 11 is a vaporizer temperature detecting means, the relay 16 is a vaporizing heater energizing means, the relay 18 is a combustion control means, and the power transistor 13 is a Compressor driving means, CT14
Respectively correspond to current detection means. The microcomputer 19 corresponds to a combustion amount setting unit, a compressor capacity setting unit, a carburetor temperature comparison unit, a current comparison unit, a vaporization heater energization prevention unit, and a capacity setting reduction unit for the compressor.

FIG. 3 is a control flowchart in the embodiment of FIG. First, the room temperature is detected by the room temperature detector 20, and the difference between the room temperature and the set temperature set by the variable resistor 21 is calculated. This temperature difference causes the compressor 1
2. Set the operating frequency and combustion amount of 2. Next, the vaporizer temperature is detected by the vaporizer temperature detector 11, and the operating current of the compressor 12 is detected by the CT. Here, if the vaporizer temperature is higher than the temperature at which combustion is possible, the relay 18 is closed and combustion is turned on because it is in a combustible state, and if it is low, the relay 18 is opened and combustion is turned off because it is not in a combustible state. Next, if the current of the compressor 12 is lower than a predetermined value, the relay 16 is closed to energize the vaporization heater 15, and the microcomputer 19 switches the power transistor 13 at the set frequency to drive the compressor 12. I do. However, if the current value of the compressor 12 is high, even if the vaporizer temperature is low, the relay 1
6, the power supply to the vaporization heater 15 is stopped, and
In order to reduce the set capacity of the compressor 12, the compressor 12 is operated at a frequency lower than the set value and the operation returns to the start.

With the above control, the capacity of the vaporization heater can be increased, and the time until ignition is shortened, so that the heating can be started quickly and comfort can be improved. Since the capacity is forcibly reduced, the energization of the vaporization heater can be started at an early stage, so that the comfort when the thermostat is frequently turned on / off can be improved.

That is, unlike the present invention, the present invention does not merely detect the operating current of the compressor 12 and inhibit the energization of the vaporizing heater when the detected current value is larger than the set value. When the compressor 12 is warmed due to frequent thermo ON / OFF, the compressor 1
The current value of No. 2 tends to increase, and ignition cannot be performed until the current value decreases. For this reason, it takes time for the air conditioner to exhibit its inherent capabilities, and thus the thermo ON
When / OFF is frequent, there is a disadvantage that comfort is impaired. However, according to the present invention, it is possible to further improve the comfort when the thermostat is turned on / off while improving the drawbacks of the conventional air conditioner as described above.

[0016]

As is apparent from the above description, according to the present invention, the capacity of the vaporization heater can be increased, and the time until ignition is shortened, so that the heating is quickly started and comfort is improved. It is possible to improve the comfort when the thermostat is turned on / off frequently because the energization of the vaporization heater can be started at an early stage by reducing the capacity of the compressor. There is.

[Brief description of the drawings]

FIG. 1 is a block diagram corresponding to the present invention.

FIG. 2 is an electric circuit diagram based on one embodiment of the present invention.

FIG. 3 is a flowchart of control in the embodiment.

FIG. 4 is a refrigeration cycle diagram in a conventional air conditioner.

FIG. 5 is a sectional view of the refrigerant heater in FIG.

[Explanation of symbols]

 11 Vaporizer temperature detector 12 Compressor 14 CT 15 Vaporization heater 17 Combustion controller 19 Microcomputer

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/02 102 F24F 11/02 F25B 13/00 341

Claims (1)

(57) [Claims] 1. An air conditioner provided with a refrigerant heater using petroleum fuel and a variable displacement compressor, a combustion amount setting means for indicating a combustion amount required for heating, and a necessary compressor Compressor capacity setting means for instructing the capacity of the compressor, and compressor driving means for driving the compressor with the capacity indicated by the compressor capacity setting means, and the fuel inside the refrigerant heater. Vaporizer temperature detecting means for detecting the temperature of the vaporizer to be vaporized, vaporizer temperature comparing means for comparing the detected vaporizer temperature with a set value, and heating the vaporizer if the vaporizer temperature is lower than the set value. A vaporizing heater energizing means for energizing the heater to perform, and a combustion control means for performing combustion according to a combustion amount instructed by the combustion amount setting means when the vaporizer reaches a combustible temperature, further comprising: Current detection means for detecting the operating current of the compressor, current comparison means for comparing the current detected by the current detection means with a set value, and when the current compared by the current comparison means is larger than the set value. A vaporization heater energization blocking unit that inhibits energization of the vaporization heater, and a capacity setting reduction unit that reduces the capacity setting of the compressor when the current of the compressor is larger than a set value when the vaporization heater is energized. An operation control device for an air conditioner, comprising a refrigerant heater.