JPH01111153A - Controller of air conditioner - Google Patents

Abstract

PURPOSE:To decrease the quantity of combustion when the temperature of a coolant rises up even when the room temperature does not rise up to prevent the rise in a pipeline pressure and to increase the safety by giving priority to a smaller one out of the quantity of combustion operated from the room temperature and the quantity of combustion operated from the temperature of the coolant. CONSTITUTION:A first thermistor 19 detects the temperature of an inflowing coolant, and a second thermistor 20 detects the room temperature. A control part 21 controls a heat source 11 and a operating part 22 operates a quantity of combustion Q1 from the detected temperature T1 of the first thermistor 19, and a second operating part 23 operates a quantity of combustion Q2 from the detected temperature of a thermistor 20. A comparison part 24 compares Q1 with Q2 and outputs a smaller one as a quantity of combustion Q. A heat source control part 25 burns the heat source 11 at the quantity of combustion Q input from the comparison part 24. When the temperature of the coolant is kept at a predetermined temperature or less, it is possible to the increase in the pressure and also to maintain a safe state. When the temperature of an inflowing coolant rises up, the quantity of combustion decreases without any relation to the quantity of combustion and hence it is possible to increase the safety without increasing the pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates particularly to combustion amount control of a control device for an air conditioner that heats a heat medium by combustion.

2. Description of the Related Art Heat pump air conditioners are generally put into practical use as devices that perform heating and cooling by connecting indoor and outdoor units with refrigerant piping. However, in the case of heat pump air conditioners, there is a problem in that their performance decreases at low outside temperatures when heating is most needed, and they are unable to blow out high-temperature, strong wind.

As a solution to such problems, for example, the patent application filed in 1983
There is a system called -245729. That is, in FIG. 6, during heating operation, first, when heating starts, the first solenoid valve 1, the second solenoid valve 2, and the open and close valves 3 are closed, and the third solenoid valve 4 and the fourth solenoid valve 5 are opened. Then, the compressor 6 is operated. Since the refrigerant path is sealed by the action of the first solenoid valve 1 and the second check valve 7, the refrigerant is distributed to the outdoor refrigerant condenser 8, the accumulator 3=-/return 9, and the various refrigerant pipes connected thereto. The refrigerant that had been in use will be suction pumped down by the operation of the compressor 6, and all the refrigerant will pass through the first check valve 10 and be transferred to the refrigerant heater 11.
It gets pumped up. After this pump-down operation, the compressor 6 is stopped, the fourth solenoid valve 5 is closed, and a burner (not shown) is ignited to start heating operation. The heat medium pumped into the refrigerant heater 11 is heated by a burner and evaporated, increasing the evaporation pressure, and the evaporated high-temperature, high-pressure refrigerant gas flows from the refrigerant heater 11 to the third solenoid valve 4 and from the refrigerant piping 12 indoors. The heat exchanger 13 is fed under pressure. At this time, when the indoor fan 14 is operated, the high-temperature, high-pressure refrigerant gas radiates heat and performs heating, thereby condensing and liquefying. The refrigerant liquid flows from the refrigerant pipe 15 through the third check valve 16 into the liquid receiver 17 and is received therein. When the liquid level of the liquid receiving liquid reaches a certain level, the on-off valve 3 is opened and evaporation pressure is applied to the liquid receiving vessel 17, and in order to have the same static pressure as the refrigerant heater 11, the liquid in the liquid receiving liquid 17 is Due to the surface head differential pressure, the refrigerant liquid in the receiver 17 flows into the refrigerant heater 11 . After the liquid level in the liquid receiver 17 drops, the on-off valve 3 closes and returns to its initial state.

As described above, during heating operation, the refrigerant is heated by the burner and the heat is transferred to the indoor unit, so it is possible to blow out high-temperature, strong wind even when the outside temperature is low.

Problems to be Solved by the Invention However, in the above system, because high-temperature refrigerant circulates, if sufficient heat exchange cannot be performed due to an abnormality in the system, such as a blockage in the indoor unit, the pressure may drop. This had the problem of dangerous situations such as pipes bursting due to rising.

The present invention solves such conventional problems, and aims to suppress the increase in pressure and improve safety.

Means for Solving the Problems In order to solve the above problems, the air conditioner control device of the present invention includes a heat source that heats a heat medium by combustion, and a heat exchanger that heats the air by heat exchange with the heat medium. a first temperature detection means for detecting the temperature of the heat medium flowing into the heat source and the heat exchanger;
a second temperature detection means for detecting room temperature; and a control section for controlling the amount of combustion of the heat source based on the temperatures detected by the first temperature detection means and the second temperature detection means; a first calculation section that calculates the combustion amount by inputting the temperature detected by the first temperature detection means; a second calculation section that calculates the combustion amount using human power from the temperature detected by the second temperature detection means; a comparison section that compares the calculation result of the first calculation section and the calculation result of the second calculation section and outputs the smaller combustion amount; and a heat source that controls the combustion amount of the heat source based on the output of the comparison section. The configuration includes a control section.

There is a close relationship between the working refrigerant temperature and the pipe pressure, and by keeping the refrigerant temperature below a certain level, pressure increases can be suppressed and a safe condition can be maintained. The present invention has the above configuration,
When the temperature of the incoming refrigerant rises, the amount of combustion decreases regardless of the room temperature, so it is possible to provide a safe air conditioner that does not increase the pressure.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In the description of the embodiment, the same parts as in FIG. 6 are given the same reference numerals for convenience, and the description will be omitted.

FIG. 1 shows a system block diagram of the present invention.

In FIG. 1, 18 is a heat transfer means having the same function as in FIG. 6, and 19 is a first thermistor for detecting the temperature of the inflowing heat medium, that is, the refrigerant, which is attached to the inflow pipe section. A second thermistor 20 detects room temperature and is attached to the air intake port. 21 is a control unit that controls the heat source 11; 22 is a first calculation unit that calculates the combustion amount Q1 from the temperature T1 detected by the first thermistor 19; and 23 is the calculation unit that calculates the combustion amount Q2 from the temperature detected by the second thermistor 2o. 24 is a comparison section that compares Ql and 02 and outputs the smaller one as the combustion amount Q; 25 is a heat source control section that burns the heat source 11 with the combustion amount Q input from the comparison section 24. . FIG. 2 shows the calculation result of the first calculation unit 22 when the thermistor 19 of 7-71 detects the refrigerant temperature T1. The amount of combustion is QH, QL
If the refrigerant temperature T1 is TI (Tla, then Q1 = QH. When the refrigerant temperature rises and reaches TI) Tla, the combustion amount is set to 0l-QL to suppress the pressure rise. . Furthermore, the refrigerant temperature rises and TI
) Tlb, 01=0, that is, combustion is stopped for safety. FIG. 3 shows the calculation result of the second calculation unit 23 when the second thermistor 20 detects the room temperature T2. Room temperature T
2 is T 2 (If T 2 a, Q2 = QH1 room temperature rises and T2) 72a, 02 = QL, further rises, T
2) At T2b, 02-0, that is, combustion is stopped. 72
a and T2b change depending on the temperature set by the user, and the room temperature is controlled to match the temperature set by the user by switching the combustion amount depending on the room temperature T2. The comparison unit 24 compares the calculation result Q1 of the first calculation unit 22 and the calculation result Q2 of the second calculation unit 23, and outputs the smaller combustion amount as Q to the heat source control unit 25.

The relationship between the refrigerant temperature T1, the room temperature T2, and the output Q of the comparator 24 is shown in FIG. FIG. 5 shows a flowchart when the above control is performed using a microcomputer.

In the above explanation, the combustion amount is controlled in two stages, QH and QL, but the same effect can be obtained even if the number of stages is increased. In that case, precise room temperature control becomes possible.

Effects of the Invention As described above, the air conditioner control device of the present invention provides the following effects.

Priority is given to the smaller combustion amount calculated from the room temperature and the smaller combustion amount calculated from the refrigerant temperature, so even if the room temperature does not rise, if the refrigerant temperature rises, the combustion amount will be reduced to prevent a rise in pipe pressure, ensuring safe air conditioning. We can provide equipment.

[Brief explanation of the drawing]

Figure 1 is a system block diagram of an air conditioner control device according to an embodiment of the present invention, Figure 2 is a characteristic diagram showing the relationship between refrigerant temperature and combustion amount, and Figure 3 is a diagram showing the relationship between indoor temperature and combustion amount. The characteristic diagrams shown in Fig. 4 show the relationship between refrigerant temperature, indoor temperature, and combustion amount. 6 is a flowchart showing the process flow of the microcomputer, and FIG. 6 is a system diagram illustrating a conventional example. 11...Heat source, 13...Heat exchanger, 1
8...Heat transport means, 19...First temperature detection means, 20...Second temperature detection means, 21
...control section, 22...first calculation section,
23... Second calculation section, 24... Comparison section, 25... Heat source control section. Name of agent: Patent attorney Toshio Nakao and one other person
'Q Banfukizo 0rei
Castle 2Q 7. The treasure

Claims (1)

[Claims] a heat source that heats a heat medium by combustion; a heat exchanger that heats air by heat exchange with the heat medium; a heat transfer means that circulates the heat medium between the heat source and the heat exchanger; and a heat medium that flows into the heat exchanger. a first temperature detection means for detecting the temperature of the room temperature, a second temperature detection means for detecting the room temperature, and a combustion amount of the heat source is determined based on the detected temperatures of the first temperature detection means and the second temperature detection means. The control section includes a first calculation section that calculates the combustion amount using the temperature detected by the first temperature detection means as an input, and a first calculation section that receives the temperature detected by the second temperature detection means as an input. a second calculation section that calculates the combustion amount; a comparison section that compares the calculation result of the first calculation section and the calculation result of the second calculation section and outputs the smaller one of the combustion amount; and the comparison section. A control device for an air conditioner, comprising a heat source control section that controls a combustion amount of the heat source based on an output of the heat source.