JPH0648107B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a dehumidifying function that performs dehumidification while interrupting the cooling operation at high humidity to suppress a sudden temperature decrease in the room, in addition to the conventional cooling function. The present invention relates to an air conditioner that the user has.

[Prior art]

The first refrigeration cycle of an air conditioner with a conventional dehumidification function
Compressor 1, condenser 2, three-way valve 3. Reheater 5,
An evaporator 7 is sequentially connected to a pipe via capillary tubes 4 and 6 which are pressure reducing means.

During the cooling operation, the refrigerant flows as shown by the broken line, and the indoor heat exchangers 5 and 7 are all used as evaporators. During the dehumidifying operation, the refrigerant flows as shown by the solid line by the action of the three-way valve, and the heat exchanger inside the chamber is the reheater 5. And the evaporator 7 are used separately. That is, one of the indoor heat exchangers is used as a reheater and the other is used as an evaporator during dehumidification, and thus a minute gap is provided to avoid heat exchange between the two. In this dehumidifying operation, when the indoor air is cooled by the evaporator 7 to be dehumidified, the cold air is discharged into the indoor atmosphere as it is and the discharge temperature is passed through the reheater 5 to prevent the room temperature from decreasing. It is devised to return to. However, when such a refrigeration cycle is configured, the three-way valve for changing the flow of the refrigerant and the above-mentioned special heat exchangers 5 and 7 are indispensable. Therefore, in this conventional dehumidification method, the cost of the three-way valve and the cost up due to the addition of parts required for mounting, the cost up of the heat exchanger, etc. lead to the product cost up, and the space factor is reduced because the three-way valve is arranged in the unit. The problems, noise problems such as valve switching noise echoing in the room, and cooling capacity down due to pressure loss of the three-way valve have become very serious problems in design.

[Object of the Invention]

INDUSTRIAL APPLICABILITY The present invention eliminates the structural difficulty in designing by mounting a three-way valve by making full use of a temperature sensor and a temperature sensor, and provides an inexpensive air conditioner having a dehumidifying function with a suppressed cooling capacity down. It was made for the purpose of.

[Outline of Invention]

The air conditioner of the present invention is an air conditioner equipped with a refrigeration cycle in which a compressor, a condenser, a pressure reducing means, an evaporator and the like are sequentially connected, and a temperature sensor for detecting the temperature of indoor air and an indoor air conditioner. Both the humidity sensor that detects the humidity of the air and the signal that is output when the above temperature sensor detects that the temperature is above the set temperature and the signal that the humidity sensor detects that the temperature is above the set humidity when the dehumidifying function is used. Only when the refrigeration cycle is input, the refrigeration cycle is operated, and when the cooling function is detected, the temperature sensor detects that the temperature is higher than or equal to the set temperature, and the control section operates the refrigeration cycle when the output signal is input. This is to reduce the room humidity while suppressing the drop in room temperature, and has a simpler configuration than an air conditioner that uses a conventional three-way valve for dehumidifying operation using a refrigeration cycle. It performs a dehumidification, is intended to provide a comfortable environment.

Example of Invention

An air conditioner having a dehumidifying function of performing dehumidification by intermittently performing the cooling operation of the embodiment will be described below. Since the cooling function is continuously operated regardless of humidity until the set temperature is detected as in the conventional case, the description thereof will be omitted. Second
The figure is a refrigeration cycle diagram used in the air conditioner of the embodiment, which is no different from the refrigeration cycle of the conventionally known air conditioner for exclusive use of the cooling function. Further, when the control circuit of the embodiment is shown in FIG. 3, and the power switch 11 of FIG. 3 is turned on during the dehumidifying function during the dehumidifying function (that is, the intermittent cooling operation) in FIG. %) And above, the temperature sensor 12 and the humidity sensor 13 as shown in FIG.
Outputs an HI signal, and when this signal is input to the control unit 14, the indoor blower motor 15, the compressor motor 16, and the outdoor blower motor 17 are energized (ON). That is, the control unit 14
Has an And circuit incorporated therein so that the operation is controlled only when signals are output from both the temperature sensor 12 and the humidity sensor 13. In the dehumidifying function, as shown in FIG. 4, the operation is stopped when the room temperature is lowered and becomes equal to or lower than the set temperature after the cooling operation is started, or when the humidity in the room is equal to or lower than the set humidity. When the room temperature or the indoor humidity rises again, the cooling intermittent operation is performed such that the cooling operation is restarted. At this time, the indoor blower is stopped for Δt time as shown in the figure.

As described above, when the temperature is equal to or higher than the set temperature and equal to or higher than the set humidity, when the intermittent cooling operation is performed, normally, the absolute humidity in the room gradually decreases and the room temperature also decreases. Then, when either the temperature or the humidity falls below the set value, the operation is stopped in order to avoid excessive temperature drop and wasteful operation in a low humidity condition. Then, the intermittent cooling operation is performed such that the operation is restarted when at least one of the set temperature and the humidity rises. Further, the stop of the indoor blower for Δt time is a time for the dew on the indoor heat exchanger 10 to flow down from the surface of the heat exchanger during the cooling operation, and has an effect of preventing the dew from being returned to the indoor atmosphere again. According to the experiment, Δt≈20 seconds is suitable.

In a practical state, changes in room temperature and humidity are as shown in FIGS. When the room temperature is not high enough to use the cooling function and the humidity is high, that is, when the set room temperature is raised (a little lower than the current room temperature), the room temperature is lowered by the cooling operation as shown in Fig. 5 and the set humidity is lower than the set humidity. First, the set temperature is reached and intermittent operation is performed to gradually dehumidify the room while suppressing a decrease in room temperature. As a result, when the indoor humidity drops and reaches the set humidity, the operation also stops. Therefore, after the humidity also drops sufficiently (reaches the set value), the operating rate decreases extremely and changes to a gentle operating state. Needless to say, the rise in room temperature and the rise in humidity are constantly monitored by the temperature sensor 12 and the humidity sensor 13, so that a comfortable state can be maintained. Also, if the room temperature is not extremely high and is close to the level of using the cooling function, that is, if the set room temperature is set low (much lower than the current room temperature), the humidity will be higher than the room temperature as shown in Fig. 6. When the humidity sensor detects that the setting has been achieved, it performs intermittent operation, and the room temperature begins to drop slightly.After the humidity reaches the set humidity once, the room temperature gradually rises due to the influence of the outdoor temperature and the room temperature at the start of operation Often approaches. Therefore, dehumidification is performed without significantly lowering the room temperature, and after almost all the moisture contained in the indoor floor, walls, etc. is dehumidified, the same gentle operation state as described above is achieved. In this case, the room temperature does not reach the set room temperature, but since the indoor humidity drops to the set value (usually 60%), the effective temperature (= the temperature display indicating the feeling given to the human body) drops as shown in the YAGROW diagram in Fig. 7. Therefore, it feels refreshing. That is, the room temperature is 24 ° C., the relative humidity ψ = 80% (wet bulb temperature 21.5
)), When the speed of the wind hitting the human body is 1 m / s, the effective temperature E. T. Is 21 ° C. at point A in FIG.
From this state, only relative humidity ψ = 60% (wet bulb temperature 18.
4 °), the effective temperature becomes 20 ° C. at point B in the figure. Therefore, if the relative humidity is lowered, the effective temperature is lowered and the body feels very refreshing, resulting in a comfortable environment.

That is, according to the present invention, the conventional refrigeration cycle that does not use the three-way valve is used as it is, and the temperature and humidity sensors are used to perform the intermittent operation of the cooling, thereby dehumidifying while suppressing a sudden decrease in room temperature and creating a comfortable environment. Is what you get. Also, in terms of design, it is possible to develop a low-priced product without the need to study the installation of a three-way valve and the design of a special heat exchanger.

〔The invention's effect〕

According to the present invention, when the room temperature is not so high that the room temperature is extremely lowered by the cooling function and the humidity is high, by selecting the dehumidifying function and setting the set room temperature lower than the present room temperature, the air in the room is reduced. When the dehumidifying function is to lower the room temperature and humidity by operating the refrigeration cycle when the temperature is above the set temperature and above the set humidity, the operation of the refrigeration cycle is stopped when the set temperature falls below the set temperature even if the set temperature is not reached. , Dehumidification is performed without lowering the room temperature,
The effective temperature is lowered to provide a refreshing bodily sensation and a comfortable environment is obtained. Moreover, wasteful driving in a humorously refreshing low humidity state is prevented, resulting in power saving. Further, when the temperature reaches the set temperature, the cooling operation is stopped even if the set humidity is not reached, and the cooling operation is repeated after waiting for the temperature to rise, so that the humidity can be lowered while suppressing the decrease in room temperature. Further, since the parts such as the three-way valve used conventionally are not used, the product design can be facilitated structurally and in space. In terms of product cost, the cost of the three-way valve and the cost of parts required for mounting and control can be significantly reduced. As a result, an inexpensive air conditioner having a dehumidifying function can be supplied to the market.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of a conventional air conditioner having a dehumidifying function, FIG. 2 is a refrigeration cycle diagram according to this embodiment, and FIG.
FIG. 4 is a control circuit diagram according to the present embodiment, FIG. 4 is an operation diagram when the dehumidifying function is shown in FIG. 3, and FIGS. 5 and 6 are room temperature and humidity change diagrams during dehumidifying function operation according to the present embodiment. The figure is a Yaguro diagram. 1 ... Compressor, 2 ... Condenser, 3 ... Three-way valve, 4 ... Cooling capillary tube, 5 ... Reheater, 6 ... Dehumidifying capillary tube, 7 ... Evaporator, 8 ... Outdoor blower , 9 ... Indoor blower, 10 ... Evaporator, 11 ... Power switch, 12 ... Temperature sensor, 13 ... Humidity sensor, 14 ... Control unit, 15 ... Indoor blower motor, 16 ... Compressor motor , 17 ... Outdoor blower motor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunori Tominaga 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Hitachi Co., Ltd. Tochigi factory (72) Inventor Shimoho Suzuki 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Hitachi, Ltd. Inside the Tochigi Plant (72) Inventor Tetsunobu Okamura 800 Ota, Ohira-cho, Shimotsuga-gun, Tochigi Inside the Tochigi Plant, Hitachi, Ltd. (56) Reference JP 58-6346 (JP, A) JP 57-73340 JP, A) Actual development Sho 47-23736 (JP, U)

Claims (1)

[Claims] 1. An air conditioner comprising a refrigeration cycle in which a compressor, a condenser, a pressure reducing means, an evaporator, etc. are sequentially connected, and a temperature sensor for detecting the temperature of indoor air, and the humidity of the indoor air. Both the humidity sensor that detects the temperature and the signal that is output when the above temperature sensor detects that the temperature is above the set temperature and that the humidity sensor detects that the temperature is above the set humidity during the dehumidification function are input. And a control unit that operates the refrigeration cycle when a signal output by detecting that the temperature sensor is above the set temperature and inputting the output signal is input during the cooling function. An air conditioner.