JP2938560B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION Field of the Invention
The present invention relates to a duct type air conditioner that controls room temperature.

2. Description of the Related Art A conventional example will be described below with reference to the drawings.

FIG. 4 is a schematic diagram showing an example of a conventional air conditioner. Reference numeral 1 denotes an indoor unit main body, which includes an indoor blower 2 therein, and a blower controller 2a for controlling an operation frequency of the indoor blower 2.
, An indoor heat exchanger 3 and a suction filter 4. Reference numeral 5 denotes an outdoor unit main body, which internally includes a compressor 6, an outdoor heat exchanger 7, and an outdoor blower 8. Further, a performance controller 9 for controlling the number of rotations of the compressor 6 and controlling the stop and operation of the compressor 6 is provided.

A blow duct 10 is provided from the indoor blower 2 to the room to be air-conditioned 11. Inside the discharge duct 10, a pressure detector 12 for detecting the external static pressure and a pressure setter 12 for setting the external static pressure to a constant value
It has a.

In addition, a suction duct 12 is provided from the room to be air-conditioned 11 to the indoor unit main body 1. The suction duct 12 is provided with a temperature detector 13 for detecting a suction air temperature, and the room to be air-conditioned 11 is provided with a room temperature setting device 13a.

Next, the operation of the air conditioner configured as described above will be described.

The indoor unit main body 1 and the outdoor unit main body 5 are connected to form a well-known refrigeration circuit, and warm air or cold air blown from the indoor unit main body 1 passes through the blow duct 10 and is guided to the room to be air-conditioned 11. .

When the air volume changes due to clogging of the suction filter 4,
The external static pressure inside the blow-out duct 10 changes, the change is captured by the pressure detector 12, and the indoor controller 2a tries to set the external static pressure to the set value by the pressure setting device 12a by the blower controller 2a.
The operation frequency is controlled so that the air volume is always kept constant.

The room temperature changes due to the change in the air conditioning load in the room to be air-conditioned 11, but the temperature change is detected by the temperature detector 13 and the compressor 6 is controlled by the capacity controller 9 in order to set the temperature to the set value of the room temperature setter 13a. Of the compressor, and also controls the stop and operation of the compressor.

However, in the above configuration, when the compressor is stopped during the heating operation, the amount of air blown to the room to be air-conditioned is the same as before the compressor was stopped. Since the blast temperature suddenly drops, a sense of cool air is given to the human body in the room to be air-conditioned, and there is a problem that comfort is greatly impaired.

In view of the above problems, the present invention provides an air conditioner having a function of setting the operating frequency of an indoor blower when a compressor is stopped during a heating operation to a predetermined frequency or less in a constant air volume type air conditioner. is there.

Means for Solving the Problems Therefore, in the air conditioner of the present invention, in addition to the conventional, when receiving a signal of the compressor stop from the capacity controller during the heating operation,
When the operating frequency of the indoor blower is above a predetermined frequency,
The operating frequency of the indoor-side blower while the compressor is stopped is changed to a predetermined frequency and kept constant.On the other hand, if the frequency at the start of the compressor stop is equal to or lower than the predetermined frequency, it is maintained as it is while the compressor is stopped and is kept constant. It is provided with a controller for a blower with a function to prevent cold air when the compressor is stopped.

Effect of the Invention With the configuration described above, the present invention suppresses the amount of air blown to the room to be air-conditioned to a predetermined amount or less when the compressor stops, in which the temperature of the air blown out to the room to be air-conditioned suddenly decreases in the heating operation, and By eliminating the feeling of cool air, comfortable air conditioning is realized.

Embodiment FIG. 1 is a schematic diagram showing an embodiment of the present invention.
This will be described below with reference to the drawings. Components having the same configuration as the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

In one embodiment of the present invention, a pressure detector
The number of rotations of the indoor blower 2 is controlled by the pressure difference between the pressure controller 12 and the pressure setting device 12a to keep the air volume constant, and when a signal to start the compressor stop is received from the capacity controller 9 during the heating operation, When the operating frequency of the inner blower 2 is equal to or higher than a predetermined frequency, the operating frequency of the indoor blower 2 during which the compressor is stopped is changed to a predetermined frequency, and is kept constant while the compressor is stopped. When the frequency is equal to or lower than the frequency, a controller 15 for a blower with a cool air prevention function at the time of the compressor stop which keeps the compressor as it is and keeps it constant is provided.

Next, the operation will be described with reference to the block diagram of FIG. 16 is a CPU (not shown) for controlling the air conditioner,
Inside, a pressure comparator 17 for comparing a set pressure X set by a pressure setter 12a with a pressure Y detected by a pressure detector 12, a set temperature S set by a room temperature setter 13a and a temperature detector A temperature comparator 18 for comparing the detected temperature T with the temperature T is provided. The CPU 16 varies the rotation speed of the compressor 6 according to the comparison result of the temperature comparator 18, varies the operating frequency of the indoor blower 2 according to the comparison result of the pressure comparator 17, and The operating frequency of the indoor blower 2 is changed.

Next, a specific example of this operation is shown in the flowchart of FIG. Except for the control when the compressor is stopped during the heating operation, the control and the basic operation during the normal operation are the same as those in the conventional example, and thus the description is omitted.

Normally, when the air volume changes due to the clogging of the suction filter 4, the external static pressure inside the duct 10 changes. At step 31, the change is captured by the pressure detector 12 and the controller 15 for the compressor with the compressor stop function operates. The operation frequency of the indoor blower 2 is controlled so that the external static pressure is set to the value set by the pressure setting device 12a. However, when the controller 15 for the compressor-stop-time-cool-air-preventing blower is received from the capacity controller 9 at step 32 during the heating operation, the operation of the indoor blower 2 is performed at step 33. Read frequency A, step 34
, Compare whether A ≧ B for a predetermined frequency B, and A ≧ B
In the case of B, in step 35, the frequency A of the indoor-side blower 2 is changed to B, and is kept constant while the compressor is stopped. If A <B, in step 36, the frequency A of the indoor-side blower is maintained as it is while the compressor is stopped and is constant.
Thereafter, in step 37, when a signal indicating the end of the compressor stop is received from the capacity controller 9, the process returns to step 31 again, and the normal static pressure control operation is performed.

As described above, according to the present embodiment, while the compressor is stopped in the heating operation, the operating frequency of the indoor-side blower is set to a predetermined value or less, whereby the amount of air blown to the room to be air-conditioned is suppressed to a predetermined amount or less. It is possible to eliminate the problem of giving a cool air feeling to a human body in a room to be air-conditioned due to a decrease in the temperature of the blown air at the time of stoppage, thereby improving comfort.

Effect of the Invention As described above, the rotational speed of the indoor blower is controlled by the pressure difference between the pressure detector that detects the pressure in the duct and the pressure setter to keep the blow amount constant, and from the capacity controller during the heating operation. When the compressor stop start signal is received, when the operating frequency of the indoor blower is equal to or higher than a predetermined frequency, the operating frequency of the indoor blower when the compressor is stopped is changed to a predetermined frequency, and the compressor is fixed during stop, When the frequency at the start of the compressor stop is equal to or lower than the predetermined frequency, the compressor during the heating operation is provided with the controller for the blower having the cool air prevention function at the time of the compressor stop which is maintained and kept constant during the stop of the compressor. When stopped, the amount of air blown to the room to be air-conditioned is suppressed to a predetermined amount or less, and the problem of giving a feeling of cool air to the human body in the room to be air-conditioned due to the decrease in the temperature of the blown air when the compressor is stopped is realized, and comfortable air conditioning is realized. What to do It is.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of the configuration of an air conditioner according to an embodiment of the present invention, FIG. 2 is a block diagram showing the operation of the present invention, FIG. 3 is a flowchart showing the operation of a specific example of the present invention, FIG. FIG. 1 is a conceptual diagram of a configuration of a conventional air conditioner. DESCRIPTION OF SYMBOLS 1 ... indoor unit main body, 2 ... indoor side blower, 3 ... indoor side heat exchanger, 4 ... suction filter, 5 ... outdoor unit main body, 6
...... Compressor, 7 ... Outdoor heat exchanger, 8 ... Outdoor blower, 9 ... Capacity controller, 10 ... Outlet duct, 11 ... Air-conditioned room, 12 ... Pressure detector, 12a ... … Pressure setting device, 13 ……
Temperature detector, 13a …… Room temperature setting device, 14 …… Suction duct, 1
5 ... Controller for blower with function to prevent cold air when compressor stops.

Claims (1)

(57) [Claims] 1. A duct-connected indoor unit body having an indoor heat exchanger, an operation frequency controlled indoor blower, and a suction filter therein, a rotation speed controlled compressor, an outdoor heat exchanger, and an indoor heat exchanger. An outdoor unit main body having an outside blower, an air outlet duct for sending cool air or hot air from the indoor unit main body to the room to be air-conditioned, a pressure detector for detecting a pressure in the air outlet duct, and a pressure in the air outlet duct A pressure setting device, a suction duct for sending return air from the conditioned room to the indoor unit main body, a temperature detector for detecting a temperature in the suction duct, and a room temperature setting device for setting a room temperature in the conditioned room. A capacity controller that controls the rotation speed of the compressor and varies the refrigerating capacity according to the temperature difference between the temperature detector and the room temperature setter, and controls the operation and stop of the compressor. The compressor operation The operating frequency of the indoor blower is controlled by the pressure difference between the pressure detector and the pressure setter so that the blowing amount is always constant, and during the heating operation, a signal for stopping the compressor is issued from the capacity controller. When receiving, if the operating frequency of the indoor blower is equal to or higher than a predetermined frequency, change the operating frequency of the indoor blower to a predetermined frequency,
When the compressor is stopped, the operating frequency of the indoor-side blower when the compressor is stopped is lower than a predetermined frequency. An air conditioner comprising a blower controller.