JPS5918255Y2 - indoor air conditioner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the structure of an indoor air conditioner, especially the installation of a temperature sensor for detecting outside air temperature.

Recently, indoor air conditioners have been equipped with a central control unit equipped with a microcomputer, processor, etc., and correct the appropriate cooling temperature set value according to changes in the outside air temperature, using the outside air temperature as one control variable. There are now devices that control driving.

An outline of the configuration of such an indoor air conditioner will be explained with reference to FIG.

In the figure, 1 is a building, in which a cooling unit 2 is installed on the indoor side and a condensing unit 3 is installed on the outdoor side, forming a refrigerant circuit.

Cooling unit 2 is indoor unit cabinet 2
1 includes an evaporator 22, an indoor ventilation fan 23, and a pressure reducing valve 25 such as a capillary tube inserted into the refrigerant pipe 24.
It is configured with.

On the other hand, the condensing unit 3 is the outdoor unit case 3.
1 includes an electric compressor 32, a condenser 33, and an outdoor fan 3
It is composed of 4.

Note that the operation of the cooling operation using the refrigerant circuit is well known and will not be explained here.

Further, on the indoor side, a central control section 4 configured as a remote central control panel for controlling operation is installed.

The central control unit 4 has a built-in microcomputer, etc., in addition to control equipment that gives various operation commands such as a power switch, timer, room temperature setting device, and operation switch, and it also has a built-in microcomputer and the like, and it processes each of the above-mentioned operation commands and indoor temperature, etc. By providing a detection signal of outside air temperature, the air conditioner is configured to operate and control the air conditioner to maintain a comfortable room temperature using outside air temperature, indoor temperature, etc. as control variables.

Incidentally, a temperature sensitive element such as a thermistor is generally used as a sensor for detecting the outside air temperature to provide an outside air temperature signal to the central control unit 4, but conventionally, the sensor is as shown by the chain line in FIG. A temperature sensor 5 is installed outdoors separately from the outdoor unit, and is connected to the central control unit 4 indoors via a lead wire 51.

However, in order to accurately sense the outside temperature with the temperature sensor 5 installed outdoors, it is necessary to prevent the influence of external disturbances such as direct heat from the sun and conductive heat from the building wall. Consideration must be taken to store it.

In addition, when installing an indoor air conditioner, it is necessary to take similar heat insulation considerations to the lead wire 51, which requires extremely complicated work to install the temperature sensor 5 in addition to installing the unit itself. was there.

As a measure to solve the above-mentioned difficulties, the present invention is capable of indirectly and accurately detecting the outside air temperature by installing an outside air temperature detection sensor in a specific location inside the cooling unit on the indoor side. The object of the present invention is to obtain an indoor air conditioner that can simplify installation work.

In order to achieve this objective, the present invention thermally couples a temperature sensor for detecting outside air temperature to the refrigerant pipe on the inlet side of the pressure reducing valve in the indoor cooling unit. The gist is that the temperature of the refrigerant on the inlet side is detected and can be converted to the outside air temperature.

The present invention will be described in detail below based on illustrated embodiments.

As shown in FIGS. 1 and 2, according to the present invention, a temperature sensor 6 such as a thermistor is installed in the refrigerant pipe 24 on the inlet side of the pressure reducing valve 25 in the cooling unit 2 on the indoor side.

The output signal is given to the central control unit 4 via a lead wire 61 wired inside the cabinet 21.

Furthermore, the temperature sensor 6 is installed in the indoor unit in advance at the factory before shipping the product.

Next, the principle by which outside air temperature can be indirectly detected using the temperature sensor 7 described above will be described.

Figure 3 shows the central temperature A of the air-cooled condenser in an outdoor condensing unit where the outside air temperature changes, and the capillary tube inlet temperature B in the indoor cooling unit.
It is a temperature characteristic diagram obtained from actual results.

As is clear from this characteristic diagram, characteristic lines A and B both change in proportion to and parallel to changes in outside temperature.

Therefore, by detecting the temperature on the inlet side of the pressure reducing valve 25 with the temperature sensor 6 mentioned above, it is possible to indirectly convert it to the outside air temperature, and the output signal of this temperature sensor 6 can be directly used as the correct outside air temperature signal. It can be given to the central control unit 4.

Moreover, since the temperature sensor 6 is installed in the indoor unit in advance, it is not affected by external disturbances such as direct heat from sunlight or conductive heat from the building wall, compared to the conventional method of installing the temperature sensor 5 outdoors. can be detected accurately, and installation of the air conditioner can be extremely simplified.

As described above, according to the configuration of the present invention, the outdoor temperature signal sent to the central control unit installed on the guide side can be skillfully detected on the indoor unit side, and it is also possible to install the indoor air conditioner in a way that is easier than before. The construction work can be simplified in comparison, etc.
It can have practical effects.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an indoor air conditioner according to an embodiment of the present invention, Figure 2 is a partial diagram of the main parts in Figure 1, and Figure 3 is a temperature diagram for explaining the principle of detecting outside air temperature according to the present invention. It is a characteristic line diagram.

Claims (1)

[Scope of utility model registration request] It has a cooling unit on the indoor side and a condensing unit on the outdoor side, and by giving the outside air temperature as one control variable to the central control unit installed on the indoor side, it is possible to control the operation appropriately according to changes in the outside air temperature. An indoor air conditioner configured to perform the following, characterized in that a temperature sensor for detecting outside air temperature is attached to a refrigerant pipe on the pressure reducing valve inlet side of an indoor cooling unit.