JP4425679B2 - Air conditioner - Google Patents

Description

  The present invention relates to an indoor fan control of an air conditioner, and more particularly to an air conditioner that performs indoor fan control during heating operation to reduce the feeling of cold wind or improve a comfortable environment forming ability. is there.

  As an example of preventing cold air feeling during heating operation in a conventional air conditioner, the blower temperature is detected at the start of the heating operation, and the indoor fan is operated at a low speed until the blowout temperature reaches a predetermined temperature. After reaching a predetermined temperature, an attempt is made to reduce the feeling of cold air by raising the indoor fan to a set air volume (see, for example, Patent Document 1).

  In addition, there are some which are designed to improve the comfort without feeling a feeling of cold air by controlling the indoor fan to repeat operation and stop and intermittently generating a high temperature blowing air (for example, Patent Document 2). reference).

Japanese Patent Laid-Open No. 60-120135 (page 2, right column, lines 3 to 11, line 3) JP 2001-336808 A (Claim 2, page 5 FIG. 4)

In the conventional indoor fan speed control of an air conditioner, priority is given to the user's air volume notch setting. Automatic fan speed control has a function to adjust the air conditioning capacity generated by changing the air volume according to the temperature difference between the set temperature and room temperature, but if the user sets the fan speed manually, the known cool air prevention fan speed control is canceled. After that, give priority to user-set fan speed. In other words, the blowing temperature during the heating operation is controlled to be a breeze when the blowing temperature is low, and to a fan speed set by the user when exceeding a predetermined temperature. In such control, especially when operating with priority on the air volume in a state where the outside air temperature is low and the heating capacity is low, even if the outside air temperature heating capacity is generated, the air at a temperature unsuitable for the heating device is blown out. There was a problem of being.
In some regions, there is a tendency to hold the hand over the air outlet of the air conditioner and judge whether the air conditioner is good or bad depending on whether the hot air is coming out regardless of the outside air temperature. In the region, there were cases where normal equipment was judged as defective.

  The present invention has been made to solve the above-described problems, and a first object thereof is to obtain an air conditioner that can obtain a blowing temperature that is equal to or higher than a predetermined temperature as much as possible by adjusting the fan speed. Is.

  Moreover, the 2nd objective is to obtain the air conditioner which can enable a user to set desired blowing temperature.

  In addition, the third object is to perform indoor fan control that takes into consideration the formation of the indoor environment while ensuring a blowing temperature that is equal to or higher than a predetermined temperature during heating operation, immediately after the release of cold wind prevention or during low outdoor air operation. An air conditioner is obtained.

  The fourth object is to obtain an air conditioner that can control indoor fans with reduced cold air feeling while taking into account the formation of the indoor environment.

  Further, the fifth object is to obtain an air conditioner that enables the user to select whether the priority is given to the blowout temperature or the blown-out air amount according to his / her preference.

  The sixth object is to let the user know that the blowout temperature control is being performed when the indoor air volume is changed to a value lower than the user set value by the blowout temperature priority control. An air conditioner that can be used is obtained.

An air conditioner according to the present invention includes a heat exchanger provided between an inlet and an outlet of an indoor unit body , an indoor fan driven by an indoor fan motor, and a pipe for detecting a pipe temperature of the heat exchanger A temperature detection sensor; an intake air temperature sensor for detecting the intake air temperature; and a control means for controlling the number of revolutions of the indoor fan motor based on an output of the pipe temperature detection sensor. when the elapsed time in the current fan speed of the fan exceeds a predetermined air volume migration permission time, the detected pipe temperature sensor the piping temperature is, when the above predetermined airflow up permission temperature the fan speed the raised, the pipe temperature is, with the case before Symbol predetermined lower air volume up permission temperature below the air volume down permission temperature performs a control operation to decrease the fan speed, the said piping temperature suction When the temperature difference from the intake air temperature detected by the air temperature sensor (pipe temperature-intake air temperature) is large, the air volume up permission temperature and the air volume down permission temperature are low, and when the temperature difference is small, the air volume is up. Based on the temperature difference, the air volume up permission temperature and the air volume down permission temperature are set and changed based on the temperature difference, and when the temperature difference is large, the air volume transition permission time. When the temperature difference is small, the air volume transition permission time is set and changed based on the temperature difference so that the air volume transition permission time is lengthened .

In the air conditioner of the present invention, the control means is configured such that when the elapsed time at the current fan speed of the indoor fan exceeds a predetermined elapsed time, the pipe temperature detected by the pipe temperature detection sensor shifts to a predetermined air volume. when exceeding the permitted time raises the fan speed, the pipe temperature is, with the prior SL when the pipe temperature is less than the air volume up permission temperature lower than a predetermined air flow down permission temperature performs a control operation to decrease the fan speed When the temperature difference between the piping temperature and the suction air temperature detected by the suction air temperature sensor (pipe temperature-suction air temperature) is large, the air volume up permission temperature and the air volume down permission temperature are lowered, and the temperature difference When the air volume is small, the air volume increase permission temperature and the air volume decrease temperature are increased based on the temperature difference so that the air volume increase permission temperature and the air volume decrease permission temperature are increased. The air volume is changed based on the temperature difference so that the air temperature transition permission time is shortened when the temperature difference is set and the temperature difference is large, and the air volume transition permission time is lengthened when the temperature difference is small. Since the transition permission time is changed , the blowing temperature can be kept at a predetermined temperature or higher. In addition, when the temperature difference is small, the responsiveness can be ensured by shortening the transition permission time, and the cold air feeling of the user can be suppressed.

Embodiment 1 FIG.
1 is a cross-sectional view showing an indoor unit of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a block diagram showing a control circuit configuration of an indoor fan of the indoor unit, and FIG. 3 is a room of the indoor unit of the air conditioner FIG. 4 is an explanatory diagram showing the control operation of the indoor fan of the air conditioner.
In FIG. 1, the indoor unit includes a main body 20, an upper panel 21 having a suction port 22, a front grill 17, a filter 18, a blower outlet 23 provided at the lower part of the main body, a vane 19 provided at the blower outlet 23, and a suction port. The indoor heat exchanger 15 and the indoor indoor fan 16 provided between 22 and the blower outlet 23 are provided. In addition, a pipe temperature detection sensor 1 provided in the indoor heat exchanger 15 for detecting the pipe temperature of the indoor heat exchanger 15 is provided.

In FIG. 2, the output signal of the pipe temperature detection sensor 1 is input to the indoor unit control circuit 7 via the A / D conversion circuit 2. A signal from the remote controller 5 is input to the indoor unit control circuit 7 via the input circuit 6. The indoor unit control circuit 7 has a threshold value memory 13 for storing a threshold value for control. The indoor unit control circuit 7 has a threshold of the pipe temperature detection sensor 1 and the remote controller 5 and the threshold value memory 13. Based on the value, the rotational speed of the indoor fan motor 9 is controlled via the indoor fan SSR output circuit 8 to rotate the indoor indoor fan 16. The indoor fan rotational speed F / B circuit 10 feeds back the rotational speed of the indoor fan motor 9 to the indoor unit control circuit 7.
Further, the threshold memory 13 stores an elapsed time threshold value that permits the air volume change of the indoor indoor fan 16 and a pipe temperature threshold value that permits the air volume change of the indoor indoor fan 16. Further, the indoor unit control circuit 7 as a control means is a microcomputer that controls the overall indoor unit control, and although not shown, also controls the compressor and the like, and also measures the elapsed time. It also has.

Next, the indoor fan control operation of the air conditioner according to Embodiment 1 of the present invention will be described with reference to FIG.
The compressor is turned on by the temperature control unit of the air conditioner, and the control state of the present invention is started from the state where the predetermined cold air prevention protection operation is completed. If it is determined that the cool air is being prevented, the indoor fan 16 is set to the cool air preventing fan speed (step S2). When the cold air is not being prevented, the process proceeds to step S3. In step S3, when the user operates the remote controller 5 which is a fan speed setting changing unit, first, the fan speed set by the user is first given priority to determine the fan speed ( Step S4). If there is no user request, the process proceeds to step S5. In step S5, it is determined whether or not an elapsed time threshold value tikou kyoka seconds at which the current fan speed permits a preset air volume change has elapsed. In this control, once the setting is changed to a new fan speed, at least the current fan speed is maintained as long as this tiko kyoka second has not elapsed (step S6), and the transition of the fan speed is not permitted.

After the elapsed time threshold value tikou kyoka seconds has elapsed in step S5, it is determined in step S7 whether the tube temperature state satisfies the fan speed transition condition. If the pipe temperature is equal to or higher than the first threshold value Tikou up of the pipe temperature permitting the air volume change, the fan speed is allowed to be increased (step S10). At this time, the target fan speed (= user set fan speed) is used as the upper limit of the fan speed after UP. If the tube temperature is lower than the first threshold value Tikou up in step S7, the process proceeds to step S8, and the tube temperature state is determined again. In step S8, if the pipe temperature is less than the second threshold value “Tikou down” of the pipe temperature permitting the air volume change, the fan speed DOWN is permitted (step S9). At this time, the minimum fan speed after the DOWN is set as the lower limit of the fan speed after DOWN with the heating operation minimum fan speed during the compressor ON determined by the equipment side. If the tube temperature exceeds the second threshold value “Tikou down” in step S8, the current fan speed is maintained (step S6).
The above operation is repeated. In the next cycle, the fan speed request by the user in step S3 has been completed as an event last time, and the process proceeds to step S5.

  Note that the “cool air prevention fan speed” in step S2 is the number of revolutions set in advance in the indoor unit, and becomes the minimum notch as the fan speed of the indoor unit. In addition, the “user requested fan speed” in step S4 is a fan speed that can be arbitrarily set by the user with an input device such as a remote controller, and is normally in three stages of Hi, Me, and Lo. “Maintenance” indicates a state and means that the fan speed notch currently being operated is maintained (not changed).

FIG. 4 shows an example of the control operation of the indoor fan 16 as described above. After the first transition permission time t1 has elapsed (after the time elapsed in step S5), the pipe temperature is equal to or higher than the first threshold value Tikou up. So, the fan speed has been increased from the current fan speed to the fan speed UP. Then, the fan speed UP, which is the current fan speed, is maintained before the lapse of tikou kyoka from t1.
When tikou kyoka elapses and t2 is reached, the pipe temperature becomes lower than the timing down, so that the fan speed is lowered by one step from the fan speed UP of the current fan speed to the fan speed down.
Thus, this control operation is repeated at the start of the heating operation.

At the start of heating operation, the fan speed up condition is satisfied when the compressor gradually warms up and the temperature rises. After the fan speed is changed, the fan speed is undershooted due to the fan speed being increased, and the fan speed Down condition is It is shown that it is established and hunting, but if the unit side is sufficiently stable, excessive undershoot and overshoot will not occur (actually set a constant so that hunting will not occur even if these exist) It converges to a fan speed that cannot satisfy the temperature.
Moreover, hunting can be prevented by dividing the pipe temperature threshold value into “Tikou up” and “Tikou down”.

As described above, even when the user manually sets the fan speed, the fan speed is always controlled by the tube temperature, so that a higher blowing temperature can be obtained even under low outside air conditions.
Further, since the fan speed is maintained for the elapsed time threshold tikou kyoka seconds after the fan speed is changed, it is possible to prevent the annoyance of hearing due to frequent fan speed changes.

Embodiment 2. FIG.
In the present embodiment, the control characteristics of the device can be easily changed by setting the elapsed time threshold and the pipe temperature threshold constant of the first embodiment.
The configuration and operation are the same as those in the first embodiment, and a description thereof is omitted.

  Table 1 is a control constant table of elapsed time threshold values and piping temperature threshold values, and Table 2 is a table showing examples of constant settings.

Table 1 shows a normal pattern, and the control constants are an air volume up permission temperature Tikou up, an air volume down permission temperature Tikou down, an air volume transition permission time tikou kyoka, and an air volume transition amount ikou N.
In Table 2, for example, by setting “Tikou up” as high as 35 ° C. as in the normal pattern A, it is possible to set more importance on prevention of cold wind. Further, if the elapsed time threshold value tikou kyoka is set to be as short as 60 seconds, the responsiveness can be increased, the time to reach the target fan speed is shortened, and the heating capacity can be set to be emphasized. Further, when the Tikou up is set to a low value of 22 ° C. as in the normal pattern B, it is possible to make the setting more emphasizing the heating capacity and emphasizing the user set fan speed.
Further, if the air volume shift amount ikou N is set as large as 1 notch as in the normal pattern A, the control is simplified and the reliability of the software is increased. The notches are fan speeds such as Hi, Me, Lo, and the like, and only the preset fan speed is used, so that the control is simplified.
Further, if the air volume transfer amount ikou N is set to be as small as 50 rpm as in the normal pattern B, the blowing temperature controllability is improved and the comfort can be improved.

Note that setting the first threshold value Tikou up higher is a means for swinging the blowout temperature higher, and the fan speed is not increased when the target blowout temperature cannot be obtained with respect to the outside air temperature. To control. When the capacity is not varied on the unit side, the blowing temperature at a certain outside air temperature has a linear function relationship with the fan speed, and the fan speed is low = the blowing temperature is high and the fan speed is high = the blowing temperature is high.
Also, if the first threshold value Tikou up is set lower, the fan speed will swing higher and the fan speed will be higher = high air volume = higher capacity, and the heating capacity (= comfort) will be higher than the blowing temperature (= comfort). = Environment formation).
The constants in Table 2 are preset when the unit (equipment) is manufactured.

  As described above, since the device characteristics can be set by changing the constant, the device characteristics can be easily changed.

Embodiment 3 FIG.
Since the purpose of Embodiments 1 and 2 of the present invention is to ensure a blow-off temperature that is equal to or higher than a predetermined temperature during heating operation, the effect can be obtained by using a setting such as the normal pattern A in Table 2 at the normal 1 level. Is highly effective. In the second embodiment, the characteristics of the device can be easily changed by setting the control constant. However, in the present embodiment, a plurality of constants are set in advance so as to correspond to the use scene of the user. 7 is prepared in the memory 13.

  Although the configuration and operation are the same as those in the first embodiment and the description thereof is omitted, it is possible to cope with this by preparing a plurality of constant settings in the threshold memory 13 shown in FIG. 1 of the first embodiment.

As described above, since a plurality of settings are stored in the threshold memory 13 in advance, the settings can be changed at the local service according to the use scene.
This is particularly effective for overseas markets where one constant cannot match the market usage environment.

Embodiment 4 FIG.
In the above first to third embodiments, the basic fan control prioritizing the blowout temperature has been described. However, the fourth embodiment further takes into account the formation of the environment as a heating operation.
FIG. 5 is a block diagram showing the configuration of the air conditioner according to Embodiment 4 of the present invention, FIG. 6 is a flowchart showing the control operation of the indoor fan of the indoor unit of the air conditioner, and FIG. 7 is a control threshold value calculation flowchart. It is.
FIG. 5 is a diagram in which an intake air temperature detection sensor 3 for detecting room temperature and an A / D conversion circuit 4 for A / D converting the output signal of the intake air temperature detection sensor 3 are added to FIG. The analog output of the intake air temperature sensor 3 is converted into a digital signal by the A / D conversion circuit 4 and is processed by the indoor unit control circuit 7. Since other configurations are the same, description thereof is omitted.

Next, the operation will be described with reference to FIGS.
FIG. 6 is obtained by adding a control threshold value calculation to step S11 in FIG. 3 of the first embodiment, and since the others are the same, description thereof will be omitted, and the control threshold value calculation performed in step S11 will be described with reference to FIG. I will explain it. In step S20, when the suction temperature detected by the suction air temperature (room temperature) detection sensor 3 is lower than a predetermined temperature C2, a threshold value y4 is set (step S30), and when the temperature is equal to or higher than C2, the process proceeds to step S21. In step S21, when the suction temperature is lower than the predetermined temperature B2, the threshold value y3 is set (step S31). When the temperature is equal to or higher than the temperature B2, the process proceeds to step S22. In step S22, the suction temperature is lower than the predetermined temperature A2. Is a threshold value y2 (step S32), and when the temperature is equal to or higher than A2, the threshold value is y1 (step S33). Note that C2 <B2 <A2.

  Thereafter, the fan speed is determined by the control threshold value obtained here after step S5 in FIG. Table 3 shows a control constant table. Table 4 shows an example of control constants.

  As described above, the first threshold value “Tikou up”, the second threshold value “Tikou down”, and the elapsed time threshold values “tikou kyoka” and “ikou_N”, which are threshold values for changing the fan speed, are changed according to the suction temperature. Therefore, for example, when the room temperature is low, an indoor heating environment is formed, so that the air volume can be output at the set fan speed even if the blowing temperature is somewhat low. By carrying out like this, the heating operation capability which forms room temperature can be exhibited, and quick warming performance can be improved. Moreover, since the difference between the suction temperature and the blow-out temperature can be maintained, it is possible to suppress the user from feeling dissatisfied with the fact that warm air is not emitted.

Embodiment 5 FIG.
The fourth embodiment is a control method that takes into account the suction temperature and also takes into account the formation of the heating room environment, but this embodiment further suppresses the feeling of cold wind while taking into account the formation of the heating environment.
The configuration is the same as in FIG. 5 of the fourth embodiment, and a description thereof is omitted.

  FIG. 8 is a calculation flowchart of the control threshold value in the control operation of the indoor fan of the air conditioner according to Embodiment 5 of the present invention.

Next, the operation will be described with reference to FIG.
The operation is the same as in FIG. 6 of the fourth embodiment, but the control threshold value calculation contents in step S11 are the same except for the above, so the explanation is omitted, and the control threshold value calculation performed in step S11 is shown in FIG. explain.
In step S40, when the temperature difference between the tube temperature detected by the tube temperature detection sensor 1 and the suction temperature detected by the suction air temperature (room temperature) detection sensor 3 is less than a predetermined temperature B1, the threshold value y3 is set. (Step S50) When the temperature is equal to or higher than the temperature B1, the process proceeds to Step S41. In Step S41, when the temperature difference is less than the predetermined temperature A1, the threshold value y2 is set (Step S51). Let y1 (step S52). Note that A1 <B1.

  Thereafter, the fan speed is determined by the control threshold value obtained here after step S5 in FIG. Table 5 shows a control constant table. Table 6 shows an example of control constants.

In Table 6, A1 is 10 deg and B1 is 20 deg. Since the threshold value Yl is a situation where the relative difference between the tube temperature and the suction temperature cannot be as much as 10 degrees, the heating capacity is very low. The outside air temperature is very low or the room temperature is very high.
In such a case, since the absolute value of the blowing temperature is required in order not to give a cool wind feeling, the UP permission temperature is set as high as 35 ° C.
The state of the threshold value Y2 is a state where the relative difference between the tube temperature and the suction temperature is 10 ° C. to 20 ° C. and the heating capacity is slightly low. However, in order to form a boundary in a state where the absolute value of the blowing temperature can be 30 ° C., the UP permission temperature is set to about 30 ° C. in the direction of increasing the breath l.
At the threshold value Y3, there is a sufficient difference between the suction temperature and the blow-out temperature, and the heating capacity is sufficient. Therefore, it is desirable to positively output the air volume. Therefore, the UP permission temperature is set to a low 20 ° C.

In the control operation, when the room temperature is high, the state where the tube temperature is low leads to an immediate cold wind feeling. Therefore, the quick response can be ensured by shortening the transition permission time.
In addition, if the air flow rate is set to a large amount when the tube temperature is low, the change in the blowout temperature after the fan speed change becomes large. Therefore, in Table 6, ikou N is set to 1 notch, but by setting ikou N small, The controllability (comfort for the user) of the blowing temperature can be improved.

  As described above, the first threshold value Tikou up, the second threshold value Tikou down, the elapsed time threshold value tikou kyoka, which are threshold values for changing the fan speed according to the temperature difference between the tube temperature and the suction temperature, Since ikou N is changed, for example, in a state where the blowing temperature is sufficiently high with respect to the suction temperature, the air volume can be emitted at the set fan speed even if the tube temperature is low. Here, the blowing temperature and the tube temperature are the same, and the fact that the tube temperature is low means that it is lower than the high state in normal heating. By doing so, air that has been sufficiently warmed with respect to room temperature can be blown out, so that there is no dissatisfaction that warm air is not emitted. Further, the same applies to the fourth embodiment. By changing the elapsed time threshold values tikou kyoka and ikou N for each threshold value, changing the fan speed when the room temperature is sufficiently high, The state of changing the fan speed when the room temperature is low can be changed.

In addition, when considering the formation of the environment, if you are too particular about the high blowing temperature, you can not get the air volume at any time, but the heating capacity increases in proportion to the air volume, so this embodiment is not the absolute value of the blowing temperature Instead, it focuses on the relative value to the suction temperature.
If a relatively high blow-off temperature is obtained, there is an advantage of increasing the air volume because there is an environment forming ability as a heating capacity.

Embodiment 6 FIG.
In the first to third embodiments, the control side sets the control constant in advance, but this embodiment allows the user to select a constant when dealing with various user usage scenes. It is a thing.
FIG. 9 is a front view of an input device for switching the air temperature switching priority of an indoor fan of an air conditioner according to Embodiment 6 of the present invention, and FIG. 10 is a control of the indoor fan of the air conditioner according to Embodiment 6 of the present invention. It is an operation | movement flowchart.
FIG. 9 shows an example of an interface used when the user selects a control constant. Specifically, an input key for selecting priority on the blowing temperature is provided on the remote controller. In this case, a plurality of settings selected by the user are prepared in advance in the threshold value memory 13 of FIG. Then, the user selects between the blowout temperature priority and the air volume setting priority according to the usage scene. The overall configuration is the same as that of FIG.

  Next, the operation will be described with reference to FIG. FIG. 10 is a control flowchart of the sixth embodiment, in which step S12 is added to FIG. 6. In step S12, the setting selected by the user through the interface is determined. If the air volume has priority, the fan speed is set as the user setting (step S13). If the air volume is not prioritized, the process proceeds to step S3. The other steps are the same as in FIG.

  As described above, since the user can freely change the setting according to his / her preference, it is possible to deal with various usage scenes.

Embodiment 7 FIG.
In the first to sixth embodiments, when the blowout temperature priority control is performed, the fan speed control is determined by the device. However, in the present embodiment, the fan speed set by the user by the current hot air priority control is used. It is intended to let you know if it is in a different state.
11 is a block diagram of an air conditioner according to Embodiment 7 of the present invention, FIG. 12 is a front view of a display unit of the indoor unit, and FIG. 13 is a control operation of the indoor fan of the air conditioner according to Embodiment 7 of the present invention. It is a flowchart.

  In FIG. 11, the display lighting output circuit 11 and the display unit 12 are added in FIG. 5 of the fourth embodiment. In FIG. 12, the display unit 12 is provided with an LED 25 that is turned on when the fan speed is DOWN from the user setting by the air temperature control.

  Next, the movement will be described with reference to FIG. FIG. 12 is obtained by adding step S14 to the control flowchart FIG. 10 of the sixth embodiment. When the air temperature priority control is set and the fan speed DOWN is set at step S9, the fan speed DOWN is set at step S14. The fact that it has been implemented is displayed on the LED 25 of the display unit 12. The other steps are the same as in FIG.

  As described above,. Since it is possible to inform the user of the control state, it is possible to appeal that the hot air priority is implemented by the control. In addition, there is no concern about whether the fan speed DOWN is a malfunction of the device.

It is sectional drawing which shows the indoor unit of the air conditioner in Embodiment 1 of this invention. It is a block diagram which shows the control circuit structure of the indoor unit of the air conditioner in Embodiment 1 of this invention. It is a flowchart which shows the control method of the indoor unit of the air conditioner in Embodiment 1 and Embodiment 5 of this invention. It is explanatory drawing which shows the indoor fan control operation | movement of the air conditioner in Embodiment 1 of this invention. It is a block diagram which shows the control circuit structure of the indoor unit of the air conditioner in Embodiment 4 of this invention. It is a flowchart which shows the control method of the indoor unit of the air conditioner in Embodiment 4 of this invention. It is a flowchart which shows the subroutine of the threshold value calculation in Embodiment 4 of this invention. It is a flowchart which shows the subroutine of the threshold value calculation in Embodiment 5 of this invention. It is a front view of the input device which switches the priority of the wind temperature switching in Embodiment 6 of this invention. It is a flowchart which shows the control method of the indoor unit of the air conditioner in Embodiment 6 of this invention. It is a block diagram which shows the control circuit structure of the indoor unit of the air conditioner in Embodiment 7 of this invention. It is a figure which shows the indoor unit display part of the air conditioner in Embodiment 7 of this invention. It is a flowchart which shows the control method of the indoor unit of the air conditioner in Embodiment 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piping temperature detection sensor, 3 Intake air temperature sensor, 7 Indoor unit control circuit, 9 Indoor fan motor, 12 Indicator lamp, 13 Memory, 15 Heat exchanger, 16 Indoor fan.

Claims (2)

A heat exchanger provided between the inlet and the outlet of the indoor unit body ,
An indoor fan driven by an indoor fan motor;
Piping temperature detecting sensor for detecting a piping temperature of the heat exchanger,
An intake air temperature sensor for detecting the intake air temperature;
Control means for controlling the rotational speed of the indoor fan motor;
With
The control means includes
Wherein when the elapsed time in the current fan speed of the indoor fan exceeds a predetermined air volume migration permission time, the detected pipe temperature sensor the piping temperature is, when the above predetermined airflow up permission temperature the increasing the fan speed, the pipe temperature is, with the case before Symbol lower than air volume up permission temperature given below airflow down permission temperature performs a control operation to decrease the fan speed,
When the temperature difference between the piping temperature and the suction air temperature detected by the suction air temperature sensor (pipe temperature-suction air temperature) is large, the air volume up permission temperature and the air volume down permission temperature are lowered, and the temperature difference is When it is small, the air volume increase permission temperature and the air volume decrease permission temperature are set based on the temperature difference so as to increase the air volume increase permission temperature and the air volume decrease permission temperature,
In addition, the air volume transition permission time is set based on the temperature difference so that the air volume transition permission time is shortened when the temperature difference is large, and the air volume transition permission time is lengthened when the temperature difference is small. An air conditioner characterized by that. To a priority to keep the blowing out temperature at a predetermined temperature, the fan speed of the indoor fan, when the user is reduced than the fan speed set, notify the user by displaying the control operation display the air conditioner according to claim 1, comprising the parts.

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