JPH0452446A - Air-conditioner - Google Patents

Abstract

PURPOSE:To make shorter the time when hot air begins to be blown by providing a moving body-detecting means for detecting the existence of a moving body in a room at which an indoor heat-exchanger is installed, and a temperature-detecting means for the heat-exchanger and a control means for the on-off control of a compressor. CONSTITUTION:When time elapses after the stoppage of heating-operation and room temperature is at 10 deg.C or lower, it is decided whether a moving body (person) is present in a room, and if the person is not present in the room, the same preheating function as usual is actuated. After that, when the person enters the room during the operation of the preheating function, a new preheating function is actuated by a control part 7 since the existence of the person is detected by a moving body-detecting device 4. After that, when the temperature of an indoor heat-exchanger exceeds a specified value, the operation of a compressor 6 therefor is stopped, and the state thereof is continued until the warm air through the heat-exchanger is at a specified temperature or lower. After that, when the new preheating function is actuated, that is, when the compressor 6 is operated at a low frequency and stopped and the air through the indoor heat-exchanger is kept almost between 40 deg.C and 50 deg.C, the same preheating function as usual is actuated if the presence of the person is not detected and this is not detected continuously.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat pump type air conditioner, and more specifically to an air conditioner that makes the indoor environment more comfortable when heating operation starts. be.

[Conventional example] Conventionally, in this type of heat pump type air conditioner, when the outside air temperature is low (for example, 3) while the heating operation is stopped,
℃), the indoor temperature is below a predetermined value (e.g. 10℃), and a predetermined time (e.g. 3 hours) or more has elapsed since the heating operation was stopped, the compressor is activated at high frequency (e.g. 3 hours).
For example, a low voltage (for example, 20 V) of 150 Hz) is applied to warm up the compressor in advance (preheating function).

This preheating function shortens the time it takes to start blowing hot air at the start of heating operation, speeds up the start-up of heating operation, and quickly makes the indoor environment comfortable.

[Problems to be Solved by the Invention] However, in the above air conditioner, when the preheating function is activated, the preheating temperature is increased in order to suppress the temperature rise of the windings of the compressor motor and to suppress its power consumption. There is a limit to how much time it takes to blow out hot air.
For example, there was a problem in that the time until the hot air was blown out could only be about 60 seconds.

This invention was made in view of the above problems, and its purpose is to further shorten the time until hot air is blown out, and to make the indoor environment more comfortable when heating operation starts. Our goal is to provide quality air conditioners.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a refrigeration cycle including a compressor, a heat exchanger, and a four-way valve, and the indoor temperature is below a predetermined value while the heating operation is stopped. In a heat pump type air conditioner that has a preheating function that warms the compressor in advance when the heating operation is stopped and a predetermined period of time has passed since the heating operation was stopped, the indoor unit of the air conditioner is installed. a moving object detection means for detecting the presence of a body;
When the indoor heat exchanger temperature detection means detects the temperature of the indoor heat exchanger and the moving object detection means detects the presence of a moving object during the operation of the preheating function, the compressor is activated. The gist of the present invention is to include a control means that operates at a low frequency and controls the operation of the compressor on and off according to the temperature of the indoor heat exchanger.

Further, in the air conditioner of the present invention, the compressor is turned on and off during the heating operation stop by detecting the temperature of the indoor heat exchanger at predetermined time intervals, and performing the operation based on the detected temperature. The indoor fan and outdoor fan remained stopped.

[Function] With the above configuration, when the heating operation of the air conditioner is stopped, for example, the indoor temperature falls below a predetermined value (e.g. 10°C) due to a drop in the outside air temperature, and a predetermined period of time has elapsed since the operation was stopped. (e.g. 3 hours), the compressor is powered at a high frequency (e.g. 1501(z) low voltage (
For example, 20v) is applied to pre-warm the compressor.

If the presence of a person is detected in the room during activation of this preheating function, the compressor is operated at a lower frequency (e.g. 20&), which constitutes a heating cycle, and the indoor/outdoor fan is stopped. As a result, the compressor and indoor heat exchanger are heated. At this time, the temperature of the indoor heat exchanger is within a predetermined value range (for example, 40°C to 50°C).
The operation of the compressor is controlled ON and OFF so that the

In addition, if the presence of a person is not detected in the room for a predetermined period of time or longer, that is, if there is no possibility that the air conditioner will be operated soon, the preheating function (energizing the compressor with a high-frequency low voltage) is performed. ).

Therefore, when heating operation of the air conditioner is performed, since the compressor and indoor heat exchanger have been warmed in advance, the time until hot air is blown is shortened, and the indoor environment at the time of heating operation is started. It becomes more comfortable.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

In Fig. 1, this heat pump type air conditioner includes a room temperature detector 1 for detecting the indoor temperature (Tr), a temperature setting device 2 for setting the temperature using a remote control, etc., and a temperature setting device for the heat exchanger of the indoor unit. An indoor heat exchanger temperature detector 3 is installed at a predetermined location (for example, on the ceiling) in the room to detect the temperature ('rn; equivalent to condensation pressure), and a pyroelectric infrared sensor, thermistor, etc. The moving object detector 4 detects a predetermined time (tl; for example, 3 hours) from the start of heating operation, and measures the predetermined time (tl; for example, 3 minutes) used during the operation of the preheating function and the preheating function. a timer 5 that measures the time (t, for example, 15 minutes) during which there is no movement of the object during operation; a compressor 6 that constitutes a refrigerating cycle for obtaining warm air; and a compressor 6 that measures the indoor temperature. A control unit (microcomputer) 7 controls the rotation of the compressor 6 at a predetermined frequency according to the set temperature, etc., and operates the conventional preheating function and the preheating function of the present invention while the heating operation is stopped.
are provided.

Further, the air conditioner includes a compressor 6, has a refrigeration cycle with a heat exchanger, a four-way valve, etc., and is also equipped with other controllers, such as an indoor/outdoor fan.

Next, the air conditioner having the above configuration will be explained with reference to the flowchart shown in FIG.

First, assuming that the heating operation of the air conditioner has been stopped, the process proceeds from step ST1 to Sr1, in which the control unit 7 determines whether or not the time measured by the timer 5 has elapsed (3 hours). If 3 hours have passed, the room temperature (Tr
) is below a predetermined temperature (T1; for example, 10° C.) (step 5T3).

Three hours have passed since the heating operation stopped, and the indoor temperature is 1.
If the temperature is below 0℃, move objects (people) indoors.
It is determined whether or not exists (step 5T4),
When no one is present in the room, a preheating function similar to the conventional one is activated. That is, a low voltage (20V) with a high frequency (150Hz) is applied to the compressor 6, and the
Since the outdoor fan remains stopped, the compressor 6 is preheated in the conventional manner.

Subsequently, if a person enters the room while the preheating function is in operation, the moving object detector 4 detects the presence of the person, so the process proceeds from step ST4 to Sr6, and the control unit 7 The preheat function of this invention is activated. That is, the compressor 6 is operated at a low frequency (for example, 207), and this operation constitutes a heating cycle, and since the indoor and outdoor fans are left stopped, the heating cycle is activated and the compressor 6 is activated. It will be heated further and the indoor heat exchanger will also be heated.

Subsequently, when the temperature (Tn) of the indoor heat exchanger exceeds a predetermined value (for example, 50°C) (step 5T7), the compressor 6
operation is turned OFF (step 5T8), and this OFF
The state continues until the temperature ('rn) of the heat exchanger falls below a predetermined value (for example, 40°C) (step 5T9).
.

Then, t8 hours (for example, 3 minutes) have passed since the temperature (Tn) of the heat exchanger became 40°C or lower, and step 5T1
0), if there is a person in the room (step STII), the process returns to step ST6 and the compressor 6 is turned on.
be made into That is, when there are people in the room, the temperature ('rn) of the indoor heat exchanger is maintained between 50°C and 40°C.

Subsequently, when the preheating function of the present invention is activated, that is, the compressor 6 is operated and stopped at a low frequency, and the indoor heat exchanger is
℃ and 50℃, if the presence of a person is not detected (step 5TII) and this detection is not continued for t time (for example, 15 minutes), the process proceeds to step ST5 and the conventional The preheating function is activated.

In this way, if there are people in the room and there is a high possibility that the air conditioner will be operated for heating, the preheating temperature of the compressor will be high.
Since the indoor heat exchanger is heated, when the air conditioner is operated for heating, the time from the operation to the start of hot air is shortened, and warm air is immediately blown out from the indoor unit's outlet. This can make the indoor environment more comfortable.

Furthermore, when no one is present in the room, it is unlikely that the air conditioner will immediately go into heating mode, so the conventional preheating function is restored to reduce power consumption as much as possible.

[Effects of the Invention] As explained above, according to the present invention, when the indoor temperature falls below a predetermined value while the heating operation is stopped, and a certain period of time has elapsed since the heating operation was stopped, the compressor is turned off. In a heat pump air conditioner having a preheating function, a moving object detector detects the presence of a moving object indoors, and an indoor heat exchanger temperature detector detects the temperature of an indoor heat exchanger.

If the moving object detector detects the presence of a moving object while the preheating function is in operation, the compressor is operated at a low frequency, and the Since it is equipped with a control unit that controls ON and OFF operation of the compressor, if there are people in the room and there is a high possibility that the air conditioner will be operated for heating, the compressor and indoor heat exchanger can be turned off. Since it can be heated, the time from heating operation to blowing out hot air can be shortened, and the start-up characteristics at the start of heating operation can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial block diagram of a heat pump type air conditioner showing an embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of the air conditioner. In the figure, 1 is a room temperature detector, 2 is a temperature setting device, 3 is an indoor unit heat exchanger temperature detector, 4 is a moving object detector (pyroelectric infrared sensor, thermistor), and 5 is a timer. 6 is a compressor, and 7 is a control unit (microcomputer). Patent applicant: Fujitsu General Co., Ltd. Agent: Patent attorney: Takuya Ohara

Claims (2)

[Claims] (1) If the refrigeration cycle includes a compressor, a heat exchanger, and a four-way valve, and the indoor temperature falls below a predetermined value while the heating operation is stopped, and a predetermined time has elapsed since the heating operation was stopped. A heat pump type air conditioner having a preheating function to warm up the compressor in advance, comprising: a moving object detection means for detecting the presence of a moving object in a room in which an indoor unit of the air conditioner is installed; and the indoor heat exchanger. indoor heat exchanger temperature detection means for detecting the temperature of the compressor; and when the moving object detection means detects the presence of a moving object while the preheating function is in operation, the compressor is operated at a low frequency. An air conditioner comprising: and a control means for controlling ON/OFF operation of the compressor according to the temperature of the indoor heat exchanger. (2) turning on the compressor while the heating operation is stopped;
2. The air conditioner according to claim 1, wherein the temperature of the indoor heat exchanger is detected at predetermined time intervals, and the turning off is performed based on the detected temperature, and at this time, the indoor fan and the outdoor fan remain stopped.