JPH0268441A - Air conditioner - Google Patents

Abstract

PURPOSE:To avoid an abnormal temperature of an indoor heat exchanger or a break-down of a compressor by a method wherein as an abnormal load condition of the indoor heat exchanger is detected, an opening degree of a louver is forcedly corrected to a normal operating angle range. CONSTITUTION:A control unit 2 may compare a room temperature Ta set by a room temperature sensor 7 with a set temperature Ts set by a room temperature setting unit 5. ON/OFF of a compressor 24 is controlled through a compressor operating circuit 8 and a switch 26 and at the same time a motor 27 i.e. an opening angular degree position of a louver 23 is controlled. A position of the louver 23 is detected by counting the number of pulses to be applied to the motor 27. A temperature Tc of an indoor heat exchanger 21 is detected by a temperature sensor 10, it is compared with a set temperature Ti of an abnormal judging temperature setting unit 12 set in response to a content of changing-over operation of a cooling changing-over unit 6 with a comparator 11. In case of Tc<=Ti (in case of cooling operation) or Tc>=Ti (in case of heating operation), an abnormal signal Q is sent to a louver driving circuit 9 and then the motor 27 is controlled in such a way as the louver 23 occupies a normal operating angle range thetab.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides an air blower which is limitedly set within the entire mechanically movable angular range at the air outlet from the indoor heat exchanger. The present invention relates to an air conditioner equipped with a louver whose opening angle is automatically adjusted within a normal operating angle range.

(Prior art) The air outlet from the indoor heat exchanger has a normal operating angle range that is set within the entire range of mechanically movable angles, depending on the cooling or heating operation. FIG. 7 shows an indoor unit of an air conditioner equipped with a louver that is automatically adjusted to a suitable opening angle. This indoor unit 20
is cooled (during cooling operation) or heated (during heating operation) by the indoor heat exchanger 21.
An indoor fan 22 is provided for blowing air indoors. A louver 23 is arranged at the air outlet for adjusting the effective opening degree and air blowing direction of the air outlet. Mechanically, the louver 23 is in the fully closed angle position A.
Is it configured so that it can be rotated manually within a wider angular range θa from a to a nearly vertical fully open angular position Ab? It is configured so that it can be rotated to an opening angular position that is preprogrammed within a narrower and limited normal operating angle range θb from the reference opening angular position Ac to the fully open angular position Ab.

(Problem to be Solved by the Invention) As described above, in the conventional air conditioner, during operation, the user manually operates the louver 23 and consciously moves it beyond the angular position Ac corresponding to the normal operating angle range θb. Therefore, as shown in FIG. 8, the user may intentionally move the louver 23 to an angular position Ad that exceeds the angular position Ac corresponding to the normal operating angle range θb. If the louver 23 is forcibly moved in the direction of narrowing the blow-off opening by manual operation in this way, the temperature of the indoor heat exchanger 21 will drop abnormally during cooling operation, and the suction pressure will drop abnormally. Freezing and condensation may occur in the equipment, and in the case of heating operation, the temperature of the indoor heat exchanger 21 may rise abnormally, causing the discharge pressure to rise abnormally and causing the compressor to break down due to the heavy load. . A situation where the compressor breaks down means that the entire air conditioner stops operating, which causes a decrease in the reliability of the entire device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air conditioner that can avoid abnormal temperatures in an indoor heat exchanger or breakdown of a compressor caused by a too narrow opening of a louver, and can improve reliability.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a normal operation that is limitedly set within the entire angular range where mechanical movement is possible at the air outlet from the indoor heat exchanger. In an air conditioner equipped with a louver whose opening angle is automatically adjusted within a range of angles,
A detecting means for detecting an abnormal load state of the indoor heat exchanger, and an opening angle correcting means for forcibly correcting the opening angle of the louver to within a normal operating angle range when the detecting means detects the abnormal load state are provided. It is characterized by

(Function) By detecting the abnormal load condition of the indoor heat exchanger and forcibly correcting the opening angle of the louver to within the normal operating angle range based on the abnormal load condition, the abnormal load condition of the indoor heat exchanger is detected. can be removed to allow normal operation to continue and improve the reliability of equipment operation.

(Embodiment) FIG. 1 shows an embodiment of the essential parts of an air conditioner according to the present invention. In FIG. 1, only a compressor (CP) 24 is shown as a component of the refrigeration cycle.

The compressor 24 is driven by a motor 25 (CM). The motor 25 is driven, for example, by an alternating current power source AC via a switch 26. The louver 23 is driven by a motor (LM) 27 made of, for example, a stepping motor.

ON10FF control of the compressor 24 and control of the opening angle position of the louver 23 are performed through the controller 2. The controller 2 is provided with a first timer 3 for a set time T1, a second timer 4 for a set time T2, a room temperature setting device 5, and a heating/cooling switch 6. Note that the timer 3.4 part including the controller 2 is composed of a microcomputer. Timer 3 is used to obtain 1j time for preparing to start the refrigeration cycle, and the set time T1
is about 10 seconds. Further, the timer 4 is used to check whether the position of the louver 23 is appropriate or not, and the set time T2 is about 2 minutes.

The controller 2 controls the room temperature Ta detected by the room temperature sensor 7.
and the set temperature Ts set by the room temperature setting device 5, and so that the former matches the latter, 0N10FF of the switch 26, that is, 0N10FF of the compressor 24 is controlled via the compressor operating circuit 8, and the louver drive circuit 9 controls the motor 27, that is, the opening angle position of the louver 23. A position detector for detecting the position of the louver 23 is not provided to avoid high costs. Therefore, using an extreme position, for example, a fully closed position or a fully open position, as a reference, the motor 27
Detection is done by counting the number of pulses applied to the

The indoor heat exchanger 21 is provided with an indoor heat exchanger temperature sensor [0] for detecting its temperature Tc, and the detected temperature Tc is guided to a comparator 1]. Further, the set temperature Ti of the abnormality judgment temperature setter 2, which is set according to the switching contents of the heating/cooling switch 6, is also guided to the comparator 11, and the temperature Tc and temperature Ti
Compare Tc≦Ti (during cooling operation) or Tc
When ≧Ti (during heating operation), an abnormality signal Q is sent to the louver drive circuit 9. When the louver drive circuit 9 receives the abnormal color code Q, it controls the motor 27 so that the louver 23 is within the normal operating angle range θb. The set temperature Ti for abnormality determination is T i =Tmr+= 1° during cooling operation.
C, and during heating operation, T i =Tmx= approximately 50°C.

2(a) and 2(b) are flowcharts for explaining the operation of the apparatus shown in FIG. 1. FIG.

When the operation is started (step 30 "YES"), depending on which side the heating/cooling switch 6 is switched to, if it is a cooling operation (step 31 "YES"), the cooling operation from step 32 is performed. , if it is the heating operation (step 31 "No"), the heating operation from step 52 onwards is carried out.

In step 32, initial settings for cooling operation are performed, and the timer 3.4 is reset to set the count number n of a counter for abnormality determination, which will be described later, to n=o. Next, the louver 23 is adjusted to an angular position for cooling operation (step 33), and the timer 3 is started (step 34). Wait until timer 3 times up (step 35 ``YES''), and unless timer 4 times up (step 36 ``no''), step 37 and subsequent steps are executed. In step 37, the room temperature Ta detected by the room temperature sensor 7 is compared with the set temperature Ts, and if Ta>Ts, the compressor 24, that is, the motor 25 is turned on (step 38), and if Ta≦Ts, the compressor 24 is turned off. (Step 39) Reset the timer 4. Step 40) and return to step 36.

If "YES" in step 36 (timer T4 is up), compare the indoor heat exchanger temperature Tc detected by the indoor heat exchanger temperature sensor 10 with the set temperature Ti=Tmn (step 41), Tc> T
mn (“No” in step 41), it is determined that the indoor heat exchanger temperature Tc has not yet reached the abnormal temperature, and the routine proceeds to the normal operation route from step 37 onwards. Tc≦Tm
If n (step 41 “YES”), the indoor heat exchanger 21
It was determined that the temperature Tc of the louver 23 had fallen abnormally.
is readjusted to a predetermined position within the normal operating angle range during cooling (step 42), and the count value n of the counter is increased by "1" (step 43). Check this count value n (step 44), and if n<3, start timer 4 (step 45) and return to step 36. Also, n
If ≧3 (“No” in step 44), the air conditioner is stopped and an abnormality is displayed (step 46). With the above steps, the series of operations of the cooling operation is completed. FIG. 3 shows how the temperature Tc of the indoor heat exchanger 21 changes when the temperature Tc of the indoor heat exchanger 21 decreases to the set temperature Tmn and the operation continues in the route from step 42 to step 45. Indoor heat exchanger temperature Tc will soon reach set temperature Tmn
It turns out that it is higher than that.

The heating operation from step 52 onwards is performed in accordance with the cooling operation. The heating operation after step 52 differs from the cooling operation after step 32 only in steps 53, 57, 61 and 62.

In step 52, initial settings for the heating operation are performed, and the timers 3 and 4 are reset, and the count number n of the counter is set to n=0. Next, the louver 23 is adjusted to the angular position for heating operation (step 53), and the timer 3 is started (step 54). Wait for timer 3 to time up (step 55 "YES"), and wait until timer 4 times up (step 56 "no").
”), execute step 57 and subsequent steps. In step 57, the room temperature Ta detected by the room temperature sensor 7 and the set temperature T
If Ta<Ts, the compressor 24, that is, the motor 25 is turned on (step 58), and T
If a≦Ts, turn off the compressor 24 (5 steps) and reset the timer 4. Step 6
0), return to step 56.

If "YES" in step 56 (timer T4 has timed up), compare the indoor heat exchanger temperature Tc detected by the indoor heat exchanger temperature sensor 10 with the set temperature Ti=Tmx (step 61), Tc< T
mx (“No” at step 61), it is determined that the indoor heat exchanger temperature Tc has not yet reached the abnormal temperature, and the routine proceeds to the normal operation route from step 57 onwards. Tc≧T
mx (step 61 "YES"), the louver 23 is readjusted to a predetermined position within the normal operating angle range during heating (step 62), and the count value n of the counter is increased by "1" (step 63). Check this count value n (step 64), and if n<3, start timer 4 (step 65) and return to step 56. Also, n
≧3 (If "NON" in step 64, the air conditioner is stopped and an error message is displayed (step 66). With the above, the series of operations of the heating operation is completed. The temperature Tc of the indoor heat exchanger 21 is Step 6 when the set temperature Tmx is reached
FIG. 4 shows how the indoor heat exchanger temperature Tc changes when the operation is continued along the route of step 65 from step 2 onward.

In this case, the indoor heat exchanger temperature Tc or the set temperature T
It can be seen that it is lower than tllX.

As described above, the loop prevents an abnormal temperature drop in the indoor heat exchanger 21 during cooling operation due to improper positioning, or a drop in the suction pressure of the compressor 24, and the resulting freezing and dew condensation of the equipment, and also prevents the equipment from freezing and dew condensation during heating operation. It is possible to prevent an abnormal increase in discharge pressure due to an abnormal temperature rise in the indoor heat exchanger 21.

In the above embodiment, the over-closed state of the louver 23 is detected based on the temperature of the indoor heat exchanger, so even when the suction air filter is clogged] ] ] 2 Since the temperature of the indoor heat exchanger increases, It is also possible to protect against an abnormal rise in temperature of the indoor heat exchanger due to clogging of the suction air filter.

Note that when the louver 23 and the indoor fan 22 are moved at the same time when starting the operation of the air conditioner, especially when the louver 23 is moved from the fully closed state, a sudden change in the air blowing noise occurs due to the movement of lou/<23. , tend to impair comfort. In such a case, as shown in FIG. 5, first move the louver 23, wait until it reaches a predetermined angle position, and then drive the indoor fan 22 with a delay time α, or As shown in the figure, the indoor fan 22 is operated at a low air volume (
(low-speed operation), and after the time α has elapsed, the original set air volume operation may be resumed.

By performing such an operation, it is possible to avoid a sudden change in the air blowing noise with respect to the movement of the louver 23, and to avoid a decrease in comfort.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent an abnormal drop in suction pressure during cooling operation and the resulting freezing and dew condensation of equipment, and prevent an operation stoppage due to an abnormal rise in discharge pressure during heating operation.
- Avoid the I+ condition and improve reliability as an air conditioner.
can be made to

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
a) and FIG. 2(b) are flowcharts for explaining the operation of the air conditioner shown in FIG. 1, and FIG. FIG. 4 is a graph showing an aspect of the temperature change of the indoor heat exchanger in the case of an abnormal temperature rise in the indoor heat exchanger during heating operation in the air conditioner of the present invention. Graphs showing one mode of temperature change in the exchanger, FIGS. 5 and 6 are time charts showing different operating modes of the louver and indoor fan at the start of operation, and FIG. 7 is a graph showing one mode of the temperature change of the exchanger. FIG. 8 is an explanatory diagram showing the state of abnormal manual operation of the louver in the indoor unit of FIG. 7, which is an internal equipment layout diagram of the indoor unit. 2... Controller, 3, 4... Timer, 5... Room temperature setting device, 6... Heating/cooling switch, 7... Room temperature sensor,
10... Indoor heat exchanger temperature sensor, 11... Comparator,
12...Abnormality determination temperature setter, 20...Indoor unit, 21...Indoor heat exchanger, 22...Indoor fan, 2
3... Louver, 24... Compressor.

Claims (1)

[Claims] The air outlet from the indoor heat exchanger is equipped with a louver whose opening angle is automatically adjusted within the normal operating angle range, which is limited to the full angular position range that can be mechanically rotated. In an air conditioner, a detection means for detecting an abnormal load state of an indoor heat exchanger, and an opening for forcibly correcting the opening angle of the louver to within the normal operating angle range when the detection means detects the abnormal load state. An air conditioner characterized by being provided with angle correction means.