JP2007057189A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve amenity by improving a dwelling environment by avoiding a malfunction in switching heating and cooling operation by influence of a short circuit to a suction port by blowout air in automatic operation of an air conditioner. <P>SOLUTION: When selecting the automatic operation by an operation mode setting device, indoor sucking temperature is detected with every at least specific time, and when easily receiving the influence of the short circuit by a form of an indoor machine, the indoor air volume and a wind direction angle, a temperature difference between the sucking temperature and the preset temperature is changed to a predetermined value, and the amenity is improved by controlling so as to change the heating and cooling switching temperature in the automatic operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to control of an air conditioner.

  In a conventional air conditioner, during automatic operation, the difference between the suction temperature and the set temperature is less than or equal to a predetermined temperature (for example, the suction temperature-the set temperature) at regular intervals, regardless of the form of the indoor unit and the air volume and direction of the indoor unit. = −3 ° C. or lower), heating operation is performed, and when the difference between the suction temperature and the set temperature is equal to or higher than a predetermined temperature (for example, suction temperature−set temperature = 3 ° C. or higher)

Between the two, control is performed so that the previous operation mode is continued (for example, during cooling operation, it is not switched to heating operation unless suction temperature−set temperature = −3 ° C. or less) (see, for example, Patent Document 1).
JP-A-6-101858

  However, a conventional air conditioner (especially a ceiling cassette type air conditioner that blows air in four directions) has a structure in which the blown air is easily sucked directly (hereinafter referred to as a short circuit). As a result, there is a discrepancy between the temperature of the room and the temperature of the air conditioner suction detection device, and the compressor may stop (thermo-off) before the temperature of the entire room approaches the set temperature of the remote controller. An indoor unit that is easily short-circuited is controlled so as to approach the set temperature by changing the difference between the suction temperature and the set temperature.

  However, during automatic operation, switching between cooling and heating (mode determination) is determined only by the difference between the suction temperature and the set temperature, so switching between cooling and heating frequently occurs, and comfort is significantly impaired.

  The present invention is to solve the above-described conventional problems, and provides an air conditioner that controls the room temperature to be close to a target set temperature even under conditions where a short circuit is likely to occur. It is for the purpose.

  The air conditioner of the present invention changes the temperature difference between the suction temperature and the set temperature according to the form of the indoor unit, the set air volume and the set air direction of the indoor unit during automatic operation, If the setting is close to the suction port), change the temperature at which the operation mode should be switched (lower during cooling, increase during heating), and without switching frequently between cooling and heating operations, the entire room By controlling so as to reliably approach the set temperature, an air conditioner with high comfort can be supplied.

The first invention includes an outdoor unit having a compressor, an outdoor heat exchanger, a blower, a four-way valve, a throttle device, a refrigerant liquid pipe, and a refrigerant gas pipe, and an indoor unit having a heat exchanger, a blower, and a wind direction changing device. Connected and at least the indoor unit temperature sensor for detecting the indoor suction temperature, the operation mode setting unit for storing the operation mode setting unit for instructing the operation of the indoor unit, and the room for storing the set air volume of the indoor fan An air conditioner that includes a blower air volume setting storage device and an indoor air direction setting storage device that stores setting values of the air direction change device, and controls at least the operation of the compressor by a differential temperature between the indoor suction temperature detection device and the operation temperature setting device. , The control unit is configured to control at least the operation of the compressor based on the corrected differential temperature, and automatically by the operation mode setting device. When the rotation is selected, the control unit is configured to detect the indoor suction temperature at least every predetermined time, and to switch between the cooling operation and the heating operation based on the temperature difference between the indoor suction temperature detection device and the operation temperature setting device, By changing the differential temperature setting value that switches between cooling operation and heating operation according to the form of at least the indoor unit, even in indoor units that are easily short-circuited, the entire room can be reliably switched without frequently switching between cooling and heating operations. By controlling to approach the set temperature, an air conditioner with high comfort can be supplied.

  In the second aspect of the invention, particularly in the automatic operation of the first aspect of the invention, it is easy to make a short circuit by changing the temperature difference setting value for determining at least switching between cooling and heating from the form of the indoor unit and the air volume setting of the indoor fan. Even if the set air volume is small and the short circuit is remarkably easy, it is possible to control the entire room to approach the set temperature without switching frequently between cooling and heating operations. The air conditioner which improves can be supplied.

  In the third aspect of the invention, particularly during the automatic operation of the first and second aspects of the invention, the temperature difference setting value for determining the switching of at least the cooling / heating according to the configuration of the indoor unit, the air volume setting of the indoor fan, and the setting of the indoor air direction changing device is set. By changing the room, it is easy to make a short circuit, and even if the set air volume is small and the set wind direction is close to the intake port, it is easy to make a short circuit without switching the cooling / heating operation frequently. It is possible to control the whole so as to reliably approach the set temperature, and it is possible to supply an air conditioner that improves comfort.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
1 is an example of a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a control block diagram, FIG. 3 is a diagram showing a temperature difference signal between suction temperature and set temperature, and FIG. Is a diagram showing temperature correction for each model, FIG. 5 is a diagram showing temperature setting values for switching between cooling and heating operation (mode determination), and FIGS. 6 and 7 are sectional views of indoor units.

  In FIG. 1, an outdoor unit 1 includes a compressor 2, an outdoor heat exchanger 3, an outdoor blower 4, a refrigerant liquid pipe 5, a refrigerant gas pipe 6, a cooling / heating switching four-way valve 7, and a throttle device 8. Is provided. The outdoor unit 1 is provided with an outdoor heat exchanger temperature detection device 9 that detects the temperature of the outdoor heat exchanger 3.

  On the other hand, the indoor unit 10 includes an indoor blower 11, an indoor heat exchanger 12, an indoor heat exchanger temperature detection device 13 that detects the temperature of the indoor heat exchanger 12, and an indoor suction temperature detection device that detects the room temperature of the room. 14, a wind direction changing device 15 for changing the wind direction, and an operation setting device 16 capable of setting an operation mode (cooling, dry, heating or automatic) desired by a resident, room temperature, operation or stop, air volume and wind direction are provided. Yes. As shown in FIG. 6, the wind direction changing device 15 includes upper and lower blades 17 and a louver motor 18, and a position desired by a resident can be selected from a plurality of positions set in the operation setting device 16 (here, FIG. 6 shows four setting examples).

In the refrigeration cycle having the above configuration, during cooling or dehumidifying operation, the refrigerant discharged from the compressor 2 flows to the outdoor heat exchanger 3 through the four-way valve 7 and is driven outdoor by the outdoor heat exchanger 3 by driving the outdoor blower 4. The refrigerant is condensed and liquefied by exchanging heat with air, and then the refrigerant decompressed by passing through the expansion device 8 evaporates in the indoor heat exchanger 11, passes through the refrigerant gas pipe 6, and again through the four-way valve 7. 2 is inhaled (the description of heating is omitted).

  Next, the control flow of the present invention will be described with reference to FIGS.

  The air conditioner control device 21 of the present invention includes an operation mode changeover switch 22 (cooling, drying, blowing, heating, or automatic) desired by a resident, an indoor temperature setting switch 23, an operation stop switch 24, and an air volume setting switch. 25 and a wind direction setting switch 26 for receiving a signal of the operation setting device 16, an indoor suction temperature detection device 14, and an indoor suction temperature setting storage device 28 for storing a set value of the indoor suction temperature. An air volume setting storage device 29 for storing an air flow setting value, an air direction setting storage device 30 for storing an air flow setting value, and an operation time setting storage device for setting a sampling time for periodically detecting the above signals. 31 and the signal transmission / reception device 32 which receives the above signals every sampling time and transmits / receives the signals inside and outside the room, and the compressor 2 and the indoor air blow by the signals 11, and an output relay circuit 33 for driving the outdoor blower 4 and the like.

  When the resident selects automatic driving with the operation mode changeover switch 22 and starts driving with the air volume setting device 25 set to a certain setting (for example, Hi) and the wind direction setting device 26 to a certain setting (for example, the wind direction 4 in FIG. 6). According to the signals of the set temperature storage device 28 and the indoor suction temperature detection device 14, the cooling operation is started when the indoor suction detection temperature is higher than the set temperature, and the heating operation is started when it is lower, but the operation time setting storage device 31 is started after the operation is started. The temperature difference calculation device 34 calculates the temperature difference between the room temperature and the set temperature every time set in (for example, every 30 minutes in this case), and when the heating operation is performed by the temperature difference signal (DT), the operation switching of FIG. (Mode switching) More than the differential temperature signal (here, for example, DT = T5) value, and in the cooling operation, the operation switching (mode switching) differential temperature signal (here, for example, DT = 12) in FIG. And switches the cooling and heating operation.

  However, in the indoor unit as shown in FIGS. 6 and 7 (here, a sectional view of a four-way ceiling cassette type is shown), the air sucked from the suction port 19 of the indoor unit 10 is exchanged indoor heat by the indoor blower 11. The air is cooled through the vessel 12 (heated by heating) and blown out from the outlet 20 by changing the direction by the upper and lower blades 17, but the air direction is downward (see FIG. In the case of the wind direction 4) 5 or when the air volume is small, the structure is such that the blown-out air is easily sucked in, and it is easy to detect a temperature lower than the room temperature during cooling operation and higher detection during heating. Therefore, there is a difference in detection between the actual room temperature and the suction temperature.

  Therefore, in the air conditioner of the present invention, the differential temperature calculation device 34 takes into account the correction coefficient (DTK) set for each model as shown in FIG. 4 and determines the model correction temperature (DTK) from the difference between the room temperature and the set temperature. ) Is used as a differential temperature signal (DT), and switching between cooling and heating is performed according to the corrected differential temperature signal (DT) value.

  And according to this configuration, by changing the differential temperature setting value for switching between cooling and heating operation (mode switching) depending on the model form of the indoor unit, even in the case of a model that is easy to short circuit, the entire room can be quickly and reliably Air conditioning equipment that can approach the set temperature and improve comfort can be supplied (for example, during cooling, there is a tendency to detect room temperature lower due to the blown air, but due to the effect of a short circuit due to the temperature shift, there is an error. To eliminate).

(Embodiment 2)
Since the refrigeration cycle diagram of the air conditioner according to the present invention is the same as that of Embodiment 1, the description thereof is omitted. 2 is a control block diagram, FIG. 3 is a diagram showing a temperature difference signal between the suction temperature and the set temperature, FIG. 4 is a diagram showing temperature correction for each model, and FIG. 5 is a temperature for switching between cooling and heating operation (mode switching). FIG. 8 is a diagram showing a set value, and FIG. 8 is a diagram showing a temperature shift.

  Next, the control flow of the present invention will be described with reference to FIGS.

  When the resident selects automatic driving with the operation mode changeover switch 22 and starts driving with the air volume setting device 25 set to a certain setting (for example, Hi) and the wind direction setting device 26 to a certain setting (for example, the wind direction 4 in FIG. 6). According to the signals of the set temperature storage device 28 and the indoor suction temperature detection device 14, the cooling operation is started when the indoor suction detection temperature is higher than the set temperature, and the heating operation is started when it is lower, but the operation time setting storage device 31 is started after the operation is started. The temperature difference calculation device 34 calculates the temperature difference by the room temperature, the set temperature, and the model correction value (DTK) every time set in (for example, every 30 minutes in this case), and during the heating operation by the temperature difference signal (DT) 5 is not less than the operation switching (mode switching) differential temperature signal (in this case, for example, DT = T5) value in FIG. 5, and during cooling operation, the operation switching (mode switching) differential temperature signal (in this case, example) If it becomes a DT = 12) values below, to switch the cooling and heating operation.

  However, as shown in FIG. 8, when the air volume setting device 25 has a certain setting (in this case, for example, the air volume Lo), in the case of cooling, a certain temperature (in this case, 1 ° C., for example). -Suction temperature-model correction factor + 1 ° C), and in the case of heating, a difference (room temperature-suction temperature-model correction factor-2 ° C) minus a certain temperature (in this case, for example, 1 ° C) from the signal of the indoor suction temperature detector 14 Switching between cooling and heating (mode switching) is performed based on the temperature signal (DT).

  As described above, based on the matrix diagram of FIG. 8, changing the differential temperature setting value for switching the cooling / heating (mode switching) by the air flow setting value of the indoor blower makes the air blow setting value of the indoor blower small and easy to make a short circuit. Even in this case, the entire room can quickly and reliably approach the set temperature, and an air conditioner that improves comfort can be supplied (for example, there is a tendency to detect a lower room temperature due to the blown wind during cooling, but the temperature shift To eliminate errors due to short circuit effects).

(Embodiment 3)
Since the refrigeration cycle diagram of the air conditioner according to the present invention is the same as that of Embodiment 1, the description thereof is omitted. 2 is a control block diagram, FIG. 3 is a diagram showing a temperature difference signal between the suction temperature and the set temperature, FIG. 4 is a diagram showing temperature correction for each model, and FIG. 5 is for switching between cooling and heating operation (mode switching). FIG. 9 is a diagram showing a temperature set value, and FIG. 9 is a diagram showing a temperature shift.

  Next, the control flow of the present invention will be described with reference to FIGS.

When the resident selects automatic driving with the operation mode changeover switch 22 and starts driving with the air volume setting device 25 set to a certain setting (for example, Hi) and the wind direction setting device 26 to a certain setting (for example, the wind direction 4 in FIG. 6). According to the signals of the set temperature storage device 28 and the indoor suction temperature detection device 14, the cooling operation is started when the indoor suction detection temperature is higher than the set temperature, and the heating operation is started when it is lower, but the operation time setting storage device 31 is started after the operation is started. The temperature difference calculation device 34 calculates the temperature difference by the room temperature, the set temperature, and the model correction value (DTK) every time set in (for example, every 30 minutes in this case), and during the heating operation by the temperature difference signal (DT) 5 is not less than the operation switching (mode switching) differential temperature signal (in this case, for example, DT = T5) value in FIG. 5, and during cooling operation, the operation switching (mode switching) differential temperature signal (in this case, example) If it becomes a DT = 12) values below, to switch the cooling and heating operation. However, as shown in FIG. 9, when the air volume setting device 25 has a certain setting (here, for example, the air volume Lo) and the air direction setting device 26 has a certain setting (here, for example, the air direction 4 in FIG. 5), the cooling has a certain temperature. (In this case, for example, 2 ° C.) Plus (room temperature−suction temperature−model correction value + 2 ° C.) from the signal of the indoor suction temperature detection device 14. Switching between cooling and heating is performed based on the differential temperature signal (DT) minus the room temperature signal (room temperature−suction temperature−model correction value−2 ° C.).

  Based on the matrix table of FIG. 8 as described above, by changing the air flow setting value of the indoor fan and the differential temperature setting value for switching the cooling and heating (mode switching) by the air direction setting device, the set air volume is small and the wind direction is downward. Even when a short circuit is likely to occur, the entire room can quickly and reliably approach the set temperature, and an air conditioner that improves comfort can be supplied. There is an error due to the short circuit effect due to the temperature shift).

  As described above, the air conditioner according to the present invention changes the temperature difference between the suction temperature and the set temperature according to the form of the indoor unit, the set air volume and the set wind direction of the indoor unit during automatic operation, and frequently performs cooling and heating operation. Since a highly comfortable air conditioner can be supplied without switching, it can also be applied to a multi-type air conditioner.

Refrigeration cycle diagram of the first to third embodiments of the present invention Control block diagram of first to third embodiments of the present invention Temperature zone diagram of the first to third embodiments of the present invention Temperature value diagram of first to third embodiments of the present invention Temperature value diagram of first to third embodiments of the present invention Cross-sectional view of the blowing unit of the indoor unit of the first to third embodiments of the present invention and the wind direction setting diagram of the wind direction change blade Sectional drawing of the indoor unit of the 1st-3rd embodiment of this invention Temperature value diagram of second embodiment of the present invention Temperature value diagram of the third embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor blower 5 Refrigerant liquid pipe 6 Refrigerant gas pipe 7 Four-way valve 8 Throttle device 9 Outdoor heat exchanger temperature detector 10 Indoor unit 11 Indoor blower 12 Indoor heat exchanger 13 Indoor heat Exchanger temperature detection device 14 Indoor suction temperature detection device 15 Indoor air direction change device 16 Operation setting device

Claims (3)

Connecting an outdoor unit having a compressor, an outdoor heat exchanger, a blower, a four-way valve, a throttling device, a refrigerant liquid pipe, and a refrigerant gas pipe to an indoor unit having a heat exchanger, a blower, and a wind direction changing device; An indoor suction temperature detecting device for detecting the indoor suction temperature in the machine, an operating temperature setting device for storing the set temperature of the operation mode setting device for instructing the operation of the indoor unit, and an indoor fan air volume setting for storing the set air volume of the indoor fan In an air conditioner that includes a storage device and an indoor wind direction setting storage device that stores a setting value of the wind direction changing device, and controls at least the operation of the compressor based on a difference between the indoor suction temperature detection device and the operating temperature setting device. The control unit is configured to provide a correction value for the differential temperature according to the form of the indoor unit, and to control at least the operation of the compressor based on the corrected differential temperature. When the automatic operation is selected by the control unit, the control unit is configured to detect the indoor suction temperature at least every predetermined time and switch between the cooling operation and the heating operation based on the temperature difference between the indoor suction temperature detection device and the operation temperature setting device. An air conditioner configured to change a differential temperature set value for switching between cooling operation and heating operation depending on at least the form of the indoor unit. The air conditioner according to claim 1, wherein the temperature difference setting value for switching between the cooling operation and the heating operation is changed according to an air volume setting value of the indoor fan. The air conditioning apparatus according to any one of claims 1 to 2, wherein a differential temperature set value for switching between cooling operation and heating operation is changed according to a set value of the indoor air direction changing device.

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