JP2012052687A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that switches between the mechanical air supply and the natural air supply, by detecting a temperature difference between a room and an underfloor using one temperature sensor.SOLUTION: The air conditioner includes a fan 2 for supplying air with a stable temperature of the underfloor from an air inlet 1, a swing louver 3 for regulating an air flow supplied, and a temperature sensor 4 at an indoor side of the air inlet 1. The air conditioner is configured: to detect an indoor temperature by the temperature sensor 4, when the air supplied from the swing louver 3 is not blown to the temperature sensor 4; to detect an underfloor temperature by the temperature sensor 4, when the air supplied from the swing louver 3 is blown to the temperature sensor 4; and to stop the fan 2, when the temperature difference between the room and the underfloor is larger than a stop temperature threshold for determining the operation stop, and the natural air supply is obtained by the temperature difference even if the fan 2 is stopped.

Description

  The present invention relates to an air conditioner that detects a temperature difference between a room and an underfloor with a single temperature sensor and switches between mechanical air supply and natural air supply.

  Today, ventilation is obliged in homes for 24 hours. In order to reduce power consumption, a temperature sensor for detecting the indoor temperature and a temperature sensor for detecting the outdoor temperature are provided, respectively. There is an air conditioner that reduces the rotational speed of the fan when natural ventilation due to a temperature difference is obtained (see, for example, Patent Document 1).

JP 2005-147469 A

  In the conventional method as described above, there is a problem that a temperature sensor is required for each of the room and the room.

  Accordingly, the present invention solves the above-described conventional problems, and an object thereof is to provide an air conditioner that detects a temperature difference between a room and an underfloor with a single temperature sensor and switches between mechanical air supply and natural air supply. To do.

  In order to achieve this object, the air conditioner of the present invention includes a fan that supplies air with a stable temperature under the floor into the room from an air supply port, a swing louver that rectifies the air to be supplied, A temperature sensor is provided on the indoor side of the air supply port. When the air supplied by the swing louver is not blown against the temperature sensor, the temperature is detected by the temperature sensor, and the air is supplied by the swing louver. When air is blown against the temperature sensor, the temperature sensor detects the underfloor temperature, and even if the fan is stopped when the temperature difference between the room and the underfloor is greater than the stop temperature threshold for determining the stoppage of operation, When the air supply is obtained, the fan is stopped.

  According to the present invention, it is possible to obtain an air conditioner that detects a temperature difference between the room and the floor with a single temperature sensor and switches between mechanical air supply and natural air supply.

The perspective view which shows the structure of the air conditioner of Embodiment 1 of this invention. (A) Side perspective view showing a normal state of the air conditioner, (b) Side perspective view showing an underfloor temperature detection state of the air conditioner The figure which shows the structure which detects underfloor temperature with the temperature sensor of the same air conditioner Flow chart showing the operation of the air conditioner The flowchart which shows operation | movement of the air conditioner of Embodiment 2 of this invention. The perspective view which shows the structure of the air conditioner of Embodiment 3 of this invention. The perspective view which shows the structure of the air conditioner of Embodiment 4 of this invention.

  The invention of the air conditioner according to claim 1 includes a fan for supplying air having a stable underfloor temperature into the room from the air supply port, a swing louver for rectifying the supplied air, and the indoor side of the air supply port. Is provided with a temperature sensor, and when the air supplied by the swing louver is not blown against the temperature sensor, the temperature sensor detects the room temperature, and the air supplied by the swing louver is supplied to the temperature sensor. When blown, the temperature sensor detects the underfloor temperature and the temperature difference between the room and the underfloor is greater than the stop temperature threshold that determines the stoppage of operation. Is configured to stop the fan, and has the function of detecting the temperature of the room and the floor by switching the swing louver. Detecting a temperature difference, mechanical air supply and the air conditioner switch the natural gas supply is obtained.

  The invention of the air conditioner according to claim 2 is configured such that the temperature sensor detects the indoor temperature in the normal state, and detects the underfloor temperature by entering the underfloor temperature detection state every predetermined underfloor detection time. An air conditioner that can detect the underfloor temperature with a small daily temperature change every predetermined time and usually detects the indoor temperature with a large temperature change, so that the temperature difference between the room and the underfloor can always be compared. can get.

  The invention of the air conditioner according to claim 3 is configured such that a predetermined underfloor detection time is set to 2 times / day and an average temperature is set to the underfloor temperature, and has an effect of sampling and averaging the minimum required number of times. Therefore, an air conditioner that can accurately detect the underfloor temperature is obtained.

  The invention of the air conditioner according to claim 4 is configured such that the fan is operated when the temperature difference between the room and the floor is smaller than the operation temperature threshold for determining the start of operation. When the natural supply air cannot be obtained, the fan operates, so that an air conditioner that can satisfy the required ventilation air volume can be obtained.

  The invention of the air conditioner according to claim 5 is configured such that the stop temperature threshold value for determining the operation stop and the operation temperature threshold value for determining the start of operation are set to different temperatures, and by providing a temperature hysteresis, in the vicinity of the temperature threshold value. Thus, the fan does not repeat the stop and operation, so that an air conditioner in which an excessive ON / OFF load is not applied to the fan drive circuit can be obtained.

  In the air conditioner according to the sixth aspect of the present invention, when the temperature difference between the room and the floor is smaller than the stop temperature threshold for determining the stoppage of operation, and the temperature difference between the room and the floor is larger than a predetermined cold air temperature threshold, It is configured to reduce the rotational speed, and has an effect of reducing the rotational speed of the fan when there is a cold wind feeling in winter, so that an air conditioner that can alleviate the cold wind feeling in winter can be obtained.

  The invention of the air conditioner according to claim 7 is configured to include a stop temperature threshold for determining operation stop and a temperature threshold changing means for changing the operation temperature threshold for determining start of operation, and determine the stop of operation. Since it has the effect | action which can change a temperature threshold value, the temperature threshold value is changed with the airtightness of a house, and the air conditioner which can satisfy a required ventilation air volume is obtained.

  The invention of the air conditioner according to claim 8 is configured to include a notification means for notifying that the fan is stopped due to natural air supply due to a temperature difference, and the fan is stopped due to a temperature difference. Since it has the effect | action which alert | reports this, the air conditioner which can confirm whether a user is satisfying required ventilation volume is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 3, the air conditioner of the present invention has a fan 2 that supplies air having a stable underfloor temperature into the room from the air inlet 1 and a swing that rectifies the air blown out from the air inlet 1. A louver 3 and a temperature sensor 4 on the indoor side of the air inlet 1 are provided in the main body 5, and a front slit 6 a is provided on the front surface of the main body 5 for detecting the temperature of the temperature sensor 4 and an inner surface 1 a of the air inlet 1 is provided. Has a side slit 6b.

  That is, the temperature sensor 4 is provided at a corner portion where the inner surface 1a of the air supply port 1 and the front surface 5a of the main body 5 intersect, and a front surface slit 6a is provided on the front surface, and a side surface slit 6b is provided on the inner surface of the air supply port 1. It is a thing.

  Here, as shown in FIG. 2, the swing louver 3 rotates about the horizontal axis 7 and rectifies the supplied air up and down, but in a normal state, as shown in FIG. The side slit 6 b is closed by the side plate 3 a of the swing louver 3, and the supplied air is not blown to the temperature sensor 4. Therefore, the temperature sensor 4 can detect the room temperature from the indoor air that naturally enters from the front slit 6a.

  On the other hand, in the underfloor temperature detection state for detecting the underfloor temperature, the side slit 6b is opened by rotating the swing louver 3 to an angle of 120 ° as shown in FIG. 2B, and as shown in FIG. The air supplied from below the floor blows from the side slit 6b to the front slit 6a and is blown to the temperature sensor 4, whereby the underfloor temperature can be detected.

  That is, the swing louver 3 is composed of a horizontal plate 3b for adjusting the wind direction and a side plate 3a for rotatably supporting the horizontal plate 3b around the horizontal shaft 7, and the side plate 3a depends on the rotation position of the swing louver 3. The side plate 3a and the side slit 6b are arranged so as to close the side slit 6b.

  In the above configuration, the operation of the air conditioner automatically operating will be described using the flowchart of FIG. In STEP 1, the main body 5 is turned on, the swing louver 3 is at a predetermined angle of 0 to 80 °, and the fan 2 is operated to supply the underfloor air to a predetermined range in the room. Start with "state".

  In STEP2, the temperature detected by the temperature sensor 4 is taken in as the room temperature. In STEP 3, it is determined whether the power has just been turned on. If the power has just been turned on, the underfloor temperature has not been detected, and the process immediately proceeds to STEP 4, which enters the “underfloor temperature detection state”. If it is not immediately after turning on the power, it is determined whether or not the underfloor detection time Tf has elapsed in STEP11. If the underfloor detection time Tf has elapsed, the process proceeds to STEP4 where the underfloor temperature is detected in order to update the underfloor temperature. If Tf has not elapsed, STEP4 to STEP7 are skipped and the process proceeds to STEP8. Here, the underfloor temperature is stable with little change in one day, and may be detected at a frequency of twice / day, and the underfloor detection time Tf is preferably 12 hours. In order to improve the detection accuracy of the underfloor temperature, it is better to average the previously detected temperature and the temperature detected this time to determine the underfloor temperature.

  In STEP 4, the process proceeds to the “under-floor temperature detection state”, and the side slit 6 b is opened by rotating the swing louver 3 to an angle of 120 °, and the air supplied into the main body 5 from under the floor as shown in FIG. 3. Is blown from the side slit 6 b to the front slit 6 a and blown to the temperature sensor 4. Here, even if the air supplied from under the floor is blown, the air around the temperature sensor 4 is not immediately replaced. Therefore, in STEP 5, it is determined whether the detected temperature is stable. Since the air around the sensor 4 is replaced with the air under the floor, the value of the temperature sensor 4 at that time is detected as the underfloor temperature. When the detection of the underfloor temperature is completed, the swing louver 3 is returned to the “normal state” in STEP 7.

  In STEP 8, the current state of the fan 2 is determined. If the fan 2 is operating, it is determined in STE 9 whether the temperature difference Td between the room and the floor is equal to or greater than the stop temperature threshold Ts that determines operation stop. When the temperature difference Td under the floor is less than the stop temperature threshold value Ts, the operation of the fan 2 is continued, and when the temperature difference Td is equal to or greater than the stop temperature threshold value Ts, the process proceeds to STEP 10 and the fan 2 is stopped and the natural supply due to the temperature difference is performed. Switch to mind. When the fan 2 is stopped in STEP 8, the process proceeds to STEP 12, where it is determined whether the temperature difference Td between the room and the floor is equal to or less than the operation temperature threshold To that determines the start of operation, and the temperature difference Td between the room and the floor is the operation temperature threshold To. If the temperature difference exceeds Td, the fan 2 is stopped. If the temperature difference Td between the room and the floor is less than the operating temperature threshold To, it is determined that natural air supply due to the temperature difference cannot be expected, and the fan 2 is operated in STEP13. And mechanical ventilation. Thus, by separating the stop temperature threshold value Ts and the operation temperature threshold value To, the ON / OFF load on the drive circuit due to the repeated operation / stop of the fan 2 when the temperature difference Td is near the temperature threshold value is reduced. be able to. Here, the stop temperature threshold Ts is 15 ° C. at which natural air supply due to a temperature difference can be expected, and the operation temperature threshold To does not repeat the operation / stop of the fan 2 if a difference of 3 ° C. from the stop temperature threshold Ts. And good.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to the flowchart of FIG. The same parts as those in the first embodiment are given the same numbers, and detailed description thereof is omitted. Steps 12 and 13 are the same as those in the first embodiment. In STEP 9, when the temperature difference Td between the room and the floor is less than the stop temperature threshold Ts, the process proceeds to STEP 12, where the temperature difference Td between the room and the floor is equal to or greater than the cold air temperature threshold Tc. If the temperature difference Td between the room and the floor is less than the cold air temperature threshold Tc, the current operation of the fan 2 is continued. If the temperature difference Td between the room and the floor is equal to or greater than the cold air temperature threshold Tc, the fan 2 The number of rotations can be reduced to relieve the cold air under the floor being supplied into the room and feeling the feeling of cold wind. Here, the cold air temperature threshold value Tc is preferably set to 10 ° C. where a cold air feeling is felt.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are given the same numbers, and detailed description thereof is omitted. As shown in FIG. 6, the main body 5 is provided with a temperature threshold value changing means 8, and the house has low airtightness, and even if the temperature difference between the room and the floor is small, the house can satisfy the ventilation air volume by natural air supply. The frequency of natural air supply can be increased by the installer changing the temperature threshold arbitrarily, and power consumption can be reduced.

  Here, it is preferable to use a slide switch or the like as the temperature threshold value changing means 8. For example, the slide switch can be switched in two stages of “high” and “low” according to the airtightness, and stopped when “high”. The temperature threshold Ts = 15 ° C., the operation temperature threshold To = 12 ° C., and in the case of “low”, the stop temperature threshold Ts = 13 ° C. and the operation temperature threshold To = 10 ° C. Natural air supply can be performed.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are given the same numbers, and detailed description thereof is omitted. As shown in FIG. 7, the main body 5 is provided with a notification means 9, and when the fan 2 is stopped because there is a temperature difference between the room and the floor and natural air supply can be expected, the notification means 9 notifies the fan 5. Even if 2 is stopped, the user can easily confirm that the ventilation airflow is normally satisfied. Here, it is good to use LED etc. as the alerting | reporting means 9, and can alert | report a state cheaply.

  The air conditioner according to the present invention detects the temperature difference between the room and the floor with a single temperature sensor, and switches between mechanical air supply and natural air supply, and is useful for air conditioners used in ordinary houses and the like. is there.

1 Air supply port 2 Fan 3 Swing louver 4 Temperature sensor 8 Temperature threshold changing means 9 Notification means

Claims (8)

  A fan that supplies air with a stable temperature under the floor into the room from the air supply port, a swing louver that rectifies the air to be supplied, and a temperature sensor on the indoor side of the air supply port, the swing louver When the supplied air is not blown against the temperature sensor, the temperature sensor detects the room temperature, and when the air supplied by the swing louver is blown against the temperature sensor, the temperature sensor detects the underfloor temperature. If the natural difference in air temperature is obtained even if the fan is stopped even if the temperature difference between the room and the floor is larger than the stop temperature threshold for determining the stoppage of operation, the fan is stopped. Air conditioning.   2. The air conditioner according to claim 1, wherein the temperature sensor detects the indoor temperature in a normal state and detects the underfloor temperature every predetermined underfloor detection time.   The air conditioner according to claim 2, wherein a predetermined underfloor detection time is set to twice per day, and an average temperature is set to the underfloor temperature.   2. The air conditioner according to claim 1, wherein the fan is operated when the temperature difference between the room and the floor becomes smaller than an operation temperature threshold for determining the start of operation.   The air conditioner according to claim 4, wherein a stop temperature threshold value for determining operation stop and an operation temperature threshold value for determining operation start are different temperatures.   The fan speed is reduced when the temperature difference between the room and the floor is smaller than a stop temperature threshold value for determining the stoppage of operation and the temperature difference between the room and the floor is larger than a predetermined cold air temperature threshold value. 1. The air conditioner according to 1.   5. The air conditioner according to claim 4, further comprising temperature threshold value changing means for changing a stop temperature threshold value for determining operation stop and an operation temperature threshold value for determining operation start.   The air conditioner according to claim 1, further comprising an informing unit for informing that the fan is stopped for natural air supply due to a temperature difference.

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