JPS6122210Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a control device for an air conditioner.

2. Description of the Related Art Conventionally, an air conditioner illustrated in FIG. 1 has been known as an air conditioner that performs heating using hot water and cooling using a refrigerant. In Fig. 1, 1 is the main body of the air conditioner, 2 is a heat exchanger installed at the front inside the main body 1, and this heat exchanger 2 has many hot water pipes 3 for heating and refrigerant pipes 4 for cooling. It is fixedly incorporated with the fin 5 of. Reference numeral 6 indicates a suction port opened on the front surface of the heat exchanger 2 of the main body 1, 7 indicates a drain receptacle provided below the heat exchanger 2 within the main body 1, and 8 indicates an opening below the drain receptacle 7 on the front surface of the main body 1. 9 is a switching damper provided at the suction port 8; 10 is an air passage formed in the main body 1 by connecting the back surface of the heat exchanger 2 and the air outlet 8; 11 is a blower fan installed in the air passage 10. It is.

In such an air conditioner, hot water is flowed through the hot water pipe 3 of the heat exchanger 2 during heating, and refrigerant is flowed through the refrigerant pipe 4 during cooling, and the blower fan 11 is rotated to blow indoor air from the suction port 6. The suction generates warm air for heating and cold air for cooling through the heat exchanger 2, and then passes through the air duct 10 to the air outlet 8.
It's blowing out into the room. Further, during heating, the switching damper 9 is set to the position shown by the solid line in FIG. 1 to blow hot air downward from the main body 1, and during cooling, the switching damper 9 is set to the position shown by the chain line in FIG. 1 to blow cold air forward.

In the above-mentioned air conditioner, conventionally, as shown in FIG. 2, the hot water pipe 3 of the heat exchanger 2 has a hot water inlet portion 3a located at the lower center in the front-rear direction, and a hot water outlet portion 3b located at the lower center of the heat exchanger 2.
The refrigerant pipe 4 has a refrigerant inlet section 4a and an outlet section 4b arranged at upper portions on both sides of the hot water outlet section 3b. In addition, a heating thermostat, that is, a cold air prevention thermostat 12 that delays the rotation of the blower fan in order to prevent the blowing of cold air immediately after the start of operation during heating, is attached to the hot water inlet 3a, and a cooling thermostat, that is, a weak operation for cooling, is installed. , or supply voltage drop,
Furthermore, a low temperature thermostat 13 for stopping the refrigerant compressor is provided at the refrigerant outlet portion 4b to prevent dew formation when the refrigerant temperature drops extremely due to fan lock or the like.

However, the heating and cooling thermostat 1
Since the thermostats 2 and 13 are provided separately and separated from each other, the temperature control circuit becomes complicated, and since the mounting positions of the two thermostats 12 and 13 are different, the workability when assembling them is poor and the manufacturing cost is high. Furthermore, since there were two control parts, there were problems such as a high failure rate.

This invention solves the above-mentioned problems by using one temperature sensing element for both heating and cooling thermostats, and simplifies the circuit configuration and facilitates assembly, reducing manufacturing costs. In addition, it is an object of the present invention to provide a highly reliable control device for an air conditioner with few failures.

An embodiment of this invention will be described below with reference to FIGS. 3 to 5.

In FIG. 3, 2 is a heat exchanger, 3 is a hot water pipe, 4 is a refrigerant pipe, and 5 is a fin. The hot water pipe 3 has a hot water inlet 3a disposed at the upper center in the front-rear direction of the heat exchanger 2, a hot water outlet 3b at the lower center, and the refrigerant pipe 4 has a refrigerant inlet 4a.
and outlet portions 4b are respectively disposed on both sides of the hot water inlet portion 3a. Further, as shown in FIGS. 3 and 4, a connecting member 14 made of a plate made of a material with high thermal conductivity is fixed across the hot water inlet section 3a and the refrigerant outlet section 3b, and In the heating/cooling thermostat 16, at least the temperature sensing element portion 18 is covered with a cover 15 made of a material with high thermal conductivity, and the cover 15 is removably fixed to the connecting member 14 with screws 17. In the dual-purpose thermostat, as shown in FIG. 5, the temperature sensing element 18 is connected to a heating side detection circuit 19 and a cooling side detection circuit 20 provided in parallel thereto, and these detection circuits 19 and 20 are used to switch between cooling and heating. It is connected to the circuit 21. The heating side detection circuit 19 is set at a temperature of 45°C to 50°C, and the cooling side detection circuit 20 is set at a temperature close to 0°C or higher.

Therefore, during heating, when the temperature of the hot water inlet section 3a becomes equal to or higher than the set temperature of the heating side detection circuit 19 due to the operation of the cooling/heating switching circuit 21, the temperature sensing element 18
The heating side detection circuit 19 is turned ON by the detection signal, and the blowing fan that was stopped at the start of the heating operation is rotated to start blowing out hot air. Also, during cooling operation, by switching the cooling/heating switching circuit 21,
When the temperature of the refrigerant outlet portion 4b becomes equal to or lower than the set temperature of the cooling side detection circuit 20, the cooling side detection circuit 20 is turned off by the detection signal of the temperature sensing element 18, and the refrigerant compressor is stopped.

It should be noted that this embodiment is the same as the conventional one shown in FIGS. 1 and 2 except for the above-mentioned parts, so the explanation will be omitted.

As explained above, the air conditioner control device according to this invention uses a single temperature-sensing element that was conventionally installed in heating and cooling thermostats, which simplifies the circuit configuration and facilitates assembly. The manufacturing cost can be lowered by making it easier to install, and since there is only one mounting location, inspection and repair such as replacement in the event of a failure is easier.Furthermore, the number of temperature sensing elements is reduced, which reduces the possibility of failure. The effect is that reliability can be improved by reducing the temperature-sensitive element, and the mounting space for the temperature-sensitive element can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic side sectional view showing an example of an air conditioner, Fig. 2 is a perspective view showing a thermostat portion of a conventional air conditioner, and Fig. 3 is a schematic diagram showing a control device according to an embodiment of the invention. FIG. 4 is an enlarged sectional view of the temperature-sensitive element mounting portion, and FIG. 5 is a control circuit diagram. 2...Heat exchanger, 3...Hot water pipe, 4...Refrigerant pipe, 16...Dual use thermostat for heating and cooling, 18...Temperature sensing element, 19...Heating side detection circuit, 20...Cooling side detection circuit, 21...cooling/heating switching circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A heat exchanger 2 for heating and cooling is constructed by fixing and incorporating a hot water pipe 3 and a refrigerant pipe 4 with a number of fins 5.
The hot water inlet portion 3a of the hot water pipe 3 is disposed at the upper center in the front-rear direction of the heat exchanger 2, and the hot water outlet portion 3b is disposed at the lower center of the heat exchanger 2,
A refrigerant inlet part 4a and an outlet part 4b of the refrigerant pipe 4 are respectively disposed on both sides of the hot water inlet part 3a, and a thermally conductive connecting member 14 is connected between the hot water inlet part 3a and the refrigerant outlet part 4b, A thermally conductive cover 15 that surrounds the temperature sensing element section 18 of the heating and cooling thermostat 16 is attached to this connecting member 14, and a heating side circuit 19 and a cooling side detection circuit 20 are connected to this temperature sensing element section 18. The cooling/heating switching circuit 21
By operating the temperature sensing element part 1 during heating,
When the detected temperature of 8 becomes equal to or higher than the set temperature of the heating side detection circuit, blowing of hot air is started, and when the detected temperature of the temperature sensing element section 18 during cooling becomes equal to or lower than the set temperature of the cooling side detection circuit 20, the compressor is stopped. An air conditioner control device characterized by: