JP6350485B2 - Air conditioner - Google Patents

Air conditioner Download PDF

Info

Publication number
JP6350485B2
JP6350485B2 JP2015215194A JP2015215194A JP6350485B2 JP 6350485 B2 JP6350485 B2 JP 6350485B2 JP 2015215194 A JP2015215194 A JP 2015215194A JP 2015215194 A JP2015215194 A JP 2015215194A JP 6350485 B2 JP6350485 B2 JP 6350485B2
Authority
JP
Japan
Prior art keywords
control
condition
mode
frequency
control unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2015215194A
Other languages
Japanese (ja)
Other versions
JP2017083145A (en
Inventor
貴裕 仲田
貴裕 仲田
伊藤 裕
裕 伊藤
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to JP2015215194A priority Critical patent/JP6350485B2/en
Publication of JP2017083145A publication Critical patent/JP2017083145A/en
Application granted granted Critical
Publication of JP6350485B2 publication Critical patent/JP6350485B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

  The present invention relates to an air conditioner.
  An air conditioner is known in which the upper air volume of a fan is set higher than the heat exchanger temperature at the start of heating operation, and the upper air volume of the fan is set lower when stable (Japanese Patent Laid-Open No. 5-87391). Publication))).
  This type of air conditioner may be provided with a high-temperature wind mode that blows higher-temperature air than a general heating mode as a heating function. When the operation mode is set to the high-temperature air mode, the air conditioner increases the temperature of the condenser by decreasing the number of rotations of the indoor fan and increasing the frequency of the compressor. At this time, if the temperature of the condenser rises too much, that is, if the refrigerant pressure rises too much, the compressor stops.
  The subject of this invention is providing the air conditioner which suppresses the excessive raise of a refrigerant | coolant pressure.
  An air conditioner according to a first aspect of the present invention includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a setting unit, and a control unit. The compressor can change the frequency. The indoor heat exchanger exchanges heat between the refrigerant circulated by the compressor and the indoor air to generate conditioned air. The outdoor heat exchanger exchanges heat between the refrigerant and the outdoor air. The setting unit sets the operation mode. The control unit performs frequency control of the compressor. When the operation mode is set to the second heating mode in which conditioned air having a temperature higher than that of the first heating mode is generated, the control unit has a first condition in which the refrigerant pressure suppression level is set to the first suppression level. Control the frequency with. Thereafter, frequency control is performed under a second condition in which the suppression level is set to a second suppression level lower than the first suppression level.
  In the air conditioner according to the first aspect of the present invention, when the operation mode is set to the second heating mode, the control unit does not immediately perform frequency control under the second condition, but under the second condition. Prior to the frequency control, the frequency control is performed under the first condition. Prior to the frequency control under the second condition, the excessive increase in the refrigerant pressure is suppressed by performing the frequency control under the first condition set at the first suppression level at which the refrigerant pressure suppression level is higher. Can do.
  In the air conditioner according to the second aspect of the present invention, when the time during which the refrigerant pressure is maintained within the preset range reaches the preset time, the control unit The frequency control under the condition shifts to the frequency control under the second condition.
  In the air conditioner according to the second aspect of the present invention, when the time during which the refrigerant pressure is maintained within the preset range has reached the preset time, that is, the stability of the refrigerant pressure is high. When secured, the control unit shifts from frequency control under the first condition to frequency control under the second condition. Since the shift to the frequency control under the second condition is performed after the stability of the refrigerant pressure is ensured, an excessive increase in the refrigerant pressure can be suppressed.
  In the air conditioner according to the third aspect of the present invention, the first condition set to the first suppression level is a condition in which the starting threshold value of the drooping control is set to the first threshold value. The second condition set to the second suppression level is a condition where the start threshold is set to the second threshold. The drooping control is included in the frequency control and is a drooping control. The second threshold is larger than the first threshold.
  In the air conditioner according to the third aspect of the present invention, the control unit performs frequency control according to the start threshold value of the drooping control. The control unit performs the drooping control at an earlier stage under the condition in which the start threshold is set to the first threshold than in the condition in which the start threshold is set to the second threshold. Therefore, an excessive increase in the refrigerant pressure can be suppressed.
  In the air conditioner according to the fourth aspect of the present invention, the frequency control includes at least one of up control and unchanged control. The up control is control for increasing the frequency. Non-change control is control that maintains the frequency. In at least one of up control under the first condition and up control under the second condition, and no change control under the first condition and no change control under the second condition, the control units are different from each other. Set the start threshold.
  In the air conditioner according to the fourth aspect of the present invention, the start threshold value for up-control and the start threshold value for unchanged control can be set as appropriate according to the first condition and the second condition.
  In the air conditioner according to the fifth aspect of the present invention, the start threshold value of the up control under the first condition is the same as the start threshold value of the up control under the second condition.
  In the air conditioner according to the fifth aspect of the present invention, since the start threshold value for the up control is common under the first condition and the second condition, the control unit shifts from the first condition to the second condition. In doing so, it becomes easier to maintain up-control.
  The air conditioner according to the sixth aspect of the present invention further includes a condenser and a temperature sensor. The temperature sensor detects the temperature of the condenser. The control unit performs frequency control based on the output value of the temperature sensor.
  In the air conditioner according to the sixth aspect of the present invention, since the control unit performs frequency control based on the output value of the temperature sensor, the air conditioner may not include a pressure sensor.
  The air conditioner according to a seventh aspect of the present invention further includes a pressure sensor that detects a refrigerant pressure on the discharge side of the compressor. The control unit performs frequency control based on the output value of the pressure sensor.
  In the air conditioner according to the seventh aspect of the present invention, the control unit performs frequency control based on the output value of the pressure sensor. Thereby, frequency control can be performed with higher accuracy.
  In the air conditioner according to the eighth aspect of the present invention, when the operation mode is set to the first heating mode, the control unit performs frequency control under the first condition.
  In the air conditioner according to the eighth aspect of the present invention, when the operation mode is set to the first heating mode, the control unit performs frequency control under the first condition. Therefore, when the operation mode is switched from the first heating mode to the second heating mode, the control unit continues the frequency control under the first condition and then performs the frequency control under the second condition. That is, since some conditions are common between the case where the operation mode is set to the first heating mode and the case where the operation mode is set to the second heating mode, the program can be simplified.
  In the air conditioner according to the ninth aspect of the present invention, when the operation mode is switched from the second heating mode to the first heating mode, the control unit performs frequency control under the first condition.
  In the air conditioner according to the ninth aspect of the present invention, when the operation mode is switched to the first heating mode, the control unit performs frequency control under the first condition without performing frequency control under the second condition. Take control. That is, instead of stepwise switching from frequency control under the second condition to frequency control under the first condition, the control is immediately switched to frequency control under the first condition. Thereby, compared with the case where frequency control switches in steps, the frequency of a compressor can be lowered more.
  In the air conditioner according to the first aspect of the present invention, prior to frequency control under the second condition, the control unit is configured under the first condition in which the suppression level of the refrigerant pressure is set to a higher first suppression level. Perform frequency control. Thereby, the excessive raise of a refrigerant | coolant pressure can be suppressed.
  In the air conditioner according to the second aspect of the present invention, the transition to the frequency control under the second condition is performed after the stability of the refrigerant pressure is ensured, so that an excessive increase in the refrigerant pressure can be suppressed.
  In the air conditioner according to the third aspect of the present invention, the control unit droops at an earlier stage under the condition in which the start threshold is set to the first threshold than in the condition in which the start threshold is set to the second threshold. Take control. Therefore, an excessive increase in the refrigerant pressure can be suppressed.
  In the air conditioner according to the fourth aspect of the present invention, the start threshold value for up-control and the start threshold value for unchanged control can be set as appropriate according to the first condition and the second condition.
  In the air conditioner according to the fifth aspect of the present invention, since the start threshold value for the up control is common under the first condition and the second condition, the control unit shifts from the first condition to the second condition. In doing so, it becomes easier to maintain up-control.
  In the air conditioner according to the sixth aspect of the present invention, since the control unit performs frequency control based on the output value of the temperature sensor, the air conditioner may not include a pressure sensor.
  In the air conditioner according to the seventh aspect of the present invention, the control unit performs frequency control based on the output value of the pressure sensor. Thereby, frequency control can be performed with higher accuracy.
  In the air conditioner according to the eighth aspect of the present invention, some conditions are common between the case where the operation mode is set to the first heating mode and the case where the operation mode is set to the second heating mode. The program can be simplified.
  In the air conditioner according to the ninth aspect of the present invention, the frequency control under the second condition is not switched stepwise to the frequency control under the first condition, but immediately switched to the frequency control under the first condition. . Thereby, compared with the case where frequency control switches in steps, the frequency of a compressor can be lowered more.
It is a figure explaining an example of composition of an air harmony machine. It is a figure explaining an example of the functional block of an air conditioner. It is a figure explaining an example of a peak cut control zone. It is a figure which shows an example of the flowchart of the setting process of a peak cut control zone. It is a figure which shows an example of the flowchart of a stabilization process.
  Embodiments of the present invention are shown below. The following embodiments are merely specific examples and do not limit the invention according to the claims.
<First Embodiment>
(1) Schematic Configuration of Air Conditioner FIG. 1 is a diagram illustrating an example of the configuration of the air conditioner 100. The air conditioner 100 includes an air conditioning outdoor unit 200 as a heat source side unit and an air conditioning indoor unit 300 as a use side unit. The air-conditioning outdoor unit 200 and the air-conditioning indoor unit 300 are connected to each other via a liquid refrigerant refrigerant communication pipe 101 and a gas refrigerant refrigerant communication pipe 102.
  The refrigerant circuit of the air conditioner 100 includes an air conditioning outdoor unit 200, an air conditioning indoor unit 300, a refrigerant communication pipe 101, and a refrigerant communication pipe 102. More specifically, the refrigerant circuit includes an expansion valve 203, a compressor 204, a four-way switching valve 205, an accumulator 206, an outdoor heat exchanger 207, and an indoor heat exchanger 301.
(2) Detailed configuration of air conditioner (2-1) Air conditioning indoor unit The air conditioning indoor unit 300 includes an indoor heat exchanger 301 and an indoor fan 302. The indoor heat exchanger 301 is, for example, a cross fin type fin-and-tube heat exchanger configured by heat transfer tubes and a large number of fins. The indoor heat exchanger 301 functions as a refrigerant evaporator during cooling operation to cool indoor air, and functions as a refrigerant condenser during heating operation to heat indoor air. That is, conditioned air is generated by exchanging heat between the refrigerant and room air. The produced conditioned air is blown out from the air outlet (not shown) of the air conditioning indoor unit 300. The indoor fan 302 supplies air to the indoor heat exchanger 301.
(2-2) Air Conditioning Outdoor Unit The air conditioning outdoor unit 200 includes a gas refrigerant pipe 201, a liquid refrigerant pipe 202, an expansion valve 203, a compressor 204, a four-way switching valve 205, an accumulator 206, and an outdoor heat exchange. And an outdoor fan 208. One end of the gas refrigerant pipe 201 is connected to the gas side end of the outdoor heat exchanger 207, and the other end of the gas refrigerant pipe 201 is connected to the four-way switching valve 205. One end of the liquid refrigerant pipe 202 is connected to the liquid side end of the outdoor heat exchanger 207, and the other end of the liquid refrigerant pipe 202 is connected to the expansion valve 203.
  The expansion valve 203 is a mechanism that depressurizes the refrigerant. The expansion valve 203 is provided between the outdoor heat exchanger 207 and the refrigerant communication pipe 101. The compressor 204 is a hermetic compressor driven by a compressor motor. The compressor motor controls the operating frequency by an inverter. Thereby, the capacity of the compressor 204 is controlled.
  The four-way switching valve 205 is a mechanism that switches the direction in which the refrigerant flows. During cooling operation, as shown by the solid line of the four-way switching valve 205 in FIG. 1, the four-way switching valve 205 connects the refrigerant pipe 201 on the discharge side of the compressor 204 and the gas refrigerant pipe 201 and passes through the accumulator 206. Thus, the refrigerant pipe on the suction side of the compressor 204 and the refrigerant communication pipe 102 are connected. On the other hand, during heating operation, as shown by the broken line of the four-way switching valve 205 in FIG. 1, the four-way switching valve 205 connects the refrigerant pipe on the discharge side of the compressor 204 and the refrigerant communication pipe 102 and also accumulator 206. Then, the refrigerant pipe on the suction side of the compressor 204 and the gas refrigerant pipe 201 are connected.
  The accumulator 206 divides the refrigerant into a gas phase and a liquid phase. The accumulator 206 is provided between the compressor 204 and the four-way switching valve 205.
  The outdoor heat exchanger 207 functions as a refrigerant condenser during the cooling operation, and functions as a refrigerant evaporator during the heating operation. The outdoor fan 208 supplies air to the outdoor heat exchanger 207.
(3) Air conditioning operation of air conditioner (3-1) Cooling operation The degree of superheat of the refrigerant at the outlet of the indoor heat exchanger 301 (that is, the gas side of the indoor heat exchanger 301) is constant for the opening degree of the expansion valve 203. It has been adjusted to be. The connection state of the four-way switching valve 205 during the cooling operation is as already described.
  In the refrigerant circuit in the above-described state, the refrigerant discharged from the compressor 204 flows into the outdoor heat exchanger 207 through the four-way switching valve 205, dissipates heat to the outdoor air, and is condensed. The refrigerant that has flowed out of the outdoor heat exchanger 207 expands when it passes through the expansion valve 203. Then, it flows into the indoor heat exchanger 301, absorbs heat from the indoor air, and evaporates.
(3-2) Heating Operation The opening degree of the expansion valve 203 is adjusted so that the degree of supercooling of the refrigerant at the outlet of the indoor heat exchanger 301 is constant at the target value of the degree of supercooling. The connection state of the four-way switching valve 205 during the heating operation is as already described.
  In the refrigerant circuit in the above state, the refrigerant discharged from the compressor 204 flows into the indoor heat exchanger 301 through the four-way switching valve 205, dissipates heat to the indoor air, and is condensed. The refrigerant that has flowed out of the indoor heat exchanger 301 expands when it passes through the expansion valve 203. Then, it flows into the outdoor heat exchanger 207, absorbs heat from the outdoor air, and evaporates. The refrigerant that has flowed out of the outdoor heat exchanger 207 passes through the four-way switching valve 205 and is again sucked into the compressor 204 and compressed.
(4) Functional block of air conditioner FIG. 2 is a diagram illustrating an example of functional blocks of the air conditioner 100. The air conditioning outdoor unit 200 includes an outdoor control unit 211 in addition to the compressor 204 described above. The air conditioning indoor unit 300 includes an indoor control unit 311, a temperature sensor 312, and a remote controller 313 in addition to the indoor fan 302 described above.
  The temperature sensor 312 detects the indoor heat exchanger temperature. The indoor heat exchanger temperature is a temperature in the two-phase region of the indoor heat exchanger 301. The temperature sensor 312 is electrically connected to the indoor control unit 311. The temperature sensor 312 transmits the detected indoor heat exchanger temperature to the indoor control unit 311.
  The remote controller 313 transmits a command signal to the indoor control unit 311 using infrared rays based on a user operation. The command signal includes a command signal related to setting of the operation mode. The user can set the operation mode of the air conditioning indoor unit 300 by operating the remote controller 313.
  The indoor control unit 311 is a computer that includes an MPU, a ROM, a RAM, and the like. The ROM stores in advance various start threshold values and the like which will be described later. The indoor control unit 311 is electrically connected to the indoor fan 302.
  The indoor control unit 311 plays a role as a setting unit that sets an operation mode based on a command signal transmitted from the remote controller 313. The operation mode includes a normal heating mode as an example of the first heating mode and a hot air mode as an example of the second heating mode. That is, the air conditioner 100 includes a normal heating mode and a high temperature air mode as a heating function. The blowing temperature in the hot air mode is higher than the blowing temperature in the normal heating mode. That is, in the hot air mode, conditioned air having a higher temperature than that in the normal heating mode is generated.
  When the operation mode is set to the high-temperature air mode, the indoor control unit 311 reduces the rotational speed of the indoor fan 302, and the outdoor control unit 211 increases the operation frequency of the compressor 204, thereby exchanging indoor heat. Increase vessel temperature. Here, the outdoor control unit 211 determines the operating frequency of the compressor 204 according to the temperature difference Δd between the indoor target temperature and the indoor actual temperature. The outdoor control unit 211 sets a maximum value that can be set as the indoor target temperature. Thereby, since the temperature difference Δd increases, the operating frequency can be increased.
  When the operation mode is set to the normal heating mode and the user requests to turn on the function of the high temperature air mode, the indoor control unit 311 switches from the normal heating mode to the high temperature air mode. On the other hand, when the operation mode is set to the hot air mode, if the user requests to turn off the function of the hot air mode, the indoor control unit 311 switches from the hot air mode to the normal heating mode. Further, even when a preset time has elapsed since the operation mode was set to the high temperature air mode, the indoor control unit 311 switches from the high temperature air mode to the normal heating mode.
  The indoor control unit 311 transmits a control signal related to the setting of the high temperature air mode to the outdoor control unit 211. The control signal related to the setting of the high temperature air mode is a control signal indicating a high temperature air notification indicating that the high temperature air mode has been set or a high temperature air release notification indicating that the high temperature air mode has been canceled. When the operation mode is set to the high temperature wind mode, the indoor control unit 311 transmits a high temperature wind notification to the outdoor control unit 211. The indoor control unit 311 transmits the indoor heat exchanger temperature and various start thresholds to the outdoor control unit 211.
  The outdoor control unit 211 is a computer that includes an MPU, a ROM, a RAM, and the like. The outdoor control unit 211 is electrically connected to the compressor 204. During the heating operation, the outdoor control unit 211 performs frequency control of the compressor 204 according to the indoor heat exchanger temperature transmitted from the indoor control unit 311. More specifically, a peak cut control zone, which will be described later, is set according to the indoor heat exchanger temperature, and the limit value of the operating frequency of the compressor 204 is set as appropriate. Further, the operation frequency of the compressor 204 is controlled within the set limit value.
  Moreover, although mentioned later in detail, the outdoor control part 211 performs the frequency control on the 1st conditions set to the 1st suppression level, when receiving a high temperature wind notification, Then, the 2nd suppression level set to the 2nd suppression level Frequency control is performed under two conditions. The first suppression level and the second suppression level are refrigerant pressure suppression levels. The first suppression level is higher than the second suppression level. In the present embodiment, the suppression level is mainly determined by the starting threshold value of the drooping control described later.
  When the indoor heat exchanger temperature rises above a preset temperature, the outdoor control unit 211 performs peak cut control for setting a limit value for the operating frequency of the compressor 204 when determining the operating frequency of the compressor 204. Run. As will be described in detail later, in the present embodiment, two types of peak cut control zones are set as zones related to peak cut control.
(5) Peak Cut Control Zone FIG. 3 is a diagram for explaining an example of the peak cut control zone. As already described, in this embodiment, two types of peak cut control zones are set. The peak cut control zone on the left side of FIG. 3 shows a normal peak cut control zone, and the peak cut control zone on the right side of FIG. 3 shows a peak cut control zone for the high temperature wind mode. The normal peak cut control zone is used, for example, when the operation mode is set to the normal heating mode.
  Each of the two types of peak cut control zones has five zones. The five zones include a stop zone, a droop zone, an unchanged zone, an up zone, and a return zone. The five zones are divided according to the indoor heat exchanger temperature. The indoor heat exchanger temperature decreases in the order of the stop zone, the droop zone, the unchanged zone, the up zone, and the return zone.
  In the present embodiment, as indicated by arrows A1 and A2, the start threshold value of each zone when the indoor heat exchanger temperature increases is different from the start threshold value of each zone when the indoor heat exchanger temperature decreases. . Here, the start threshold value of each zone when the indoor heat exchanger temperature rises will be mainly described.
  The stop zone is a zone in which the compressor 204 is stopped. The start threshold value ST is a start threshold value for stop control. The start threshold ST is common to the normal peak cut control zone and the peak cut control zone for the high temperature wind mode. The start threshold ST is set in advance according to the allowable refrigerant pressure.
  The outdoor control unit 211 performs stop control when the indoor heat exchanger temperature reaches the start threshold ST. That is, the compressor 204 is stopped.
  The drooping zone is a zone in which the limit value of the operating frequency of the compressor 204 is drooped at regular intervals. The start threshold value Df as the first threshold value is a start threshold value for the drooping control in the normal peak cut control zone. The start threshold value Ds as the second threshold value is a start threshold value for drooping control in the peak cut control zone for the high-temperature wind mode. The start threshold value Ds is larger than the start threshold value Df. For this reason, the width of the drooping zone for the hot air mode is narrower than that of the normal drooping zone. In other words, the difference between the start threshold ST and the start threshold Ds is smaller than the difference between the start threshold ST and the start threshold Df. For example, if the start threshold value Ds of the drooping control is set to about 58 ° C., 60 ° C. can be realized as the blowing temperature in the high-temperature air mode by using the discharge gas.
  In the present embodiment, the first condition set to the above-described first suppression level is a condition in which the start threshold value of the drooping control is set to the start threshold value Df. The second condition set to the second suppression level is a condition where the start threshold value of the drooping control is set to the start threshold value Ds.
  In the normal peak cut control zone, the outdoor control unit 211 performs drooping control when the indoor heat exchanger temperature reaches the start threshold value Df. That is, the limit value of the operating frequency of the compressor 204 is dropped at regular intervals. Similarly, in the peak cut control zone for the high-temperature wind mode, the drooping control is executed when the indoor heat exchanger temperature reaches the start threshold value Ds. The outdoor control unit 211 may make the drooping speed of the limit value common or different between the normal peak cut control zone and the peak cut control zone for the hot air mode. Since the limit value of the operating frequency of the compressor 204 hangs down, the operating frequency of the compressor 204 also decreases as the limit value hangs down.
  The non-change zone is a zone in which the limit value of the operating frequency of the compressor 204 is not changed. The start threshold value Mf is a start threshold value for the non-change control in the normal peak cut control zone. The start threshold value Ms is a start threshold value for unchanged control in the peak cut control zone for the high-temperature wind mode. The start threshold value Ms is larger than the start threshold value Mf.
  In the normal peak cut control zone, the outdoor control unit 211 performs no-change control when the indoor heat exchanger temperature reaches the start threshold value Mf. That is, the operating frequency limit value of the compressor 204 is maintained. Similarly, in the peak cut control zone for the high-temperature air mode, when the indoor heat exchanger temperature reaches the start threshold value Ms, no change control is executed.
  The up zone is a zone in which the limit value of the operating frequency of the compressor 204 is increased at regular intervals. The start threshold value UP is a start threshold value for up control. In the present embodiment, the start threshold value UP is common to the normal peak cut control zone and the peak cut control zone for the hot air mode.
  The outdoor control unit 211 performs the up control when the indoor heat exchanger temperature reaches the start threshold value UP. That is, the limit value of the operating frequency of the compressor 204 is increased at regular intervals. The outdoor control unit 211 may make the increase rate of the limit value common or different between the normal peak cut control zone and the peak cut control zone for the hot air mode. Since the limit value of the operating frequency of the compressor 204 increases, the operating frequency of the compressor 204 increases as the limit value increases.
  The return zone is a zone that releases the limit value of the operating frequency of the compressor 204. The start threshold value RE is a start threshold value for return control when the indoor heat exchanger temperature decreases. In the present embodiment, the start threshold value RE is common to the normal peak cut control zone and the peak cut control zone for the hot air mode.
  The outdoor control unit 211 performs return control when the indoor heat exchanger temperature reaches the start threshold value RE. That is, the limit value of the operating frequency of the compressor 204 is released.
(6) Flowchart FIG. 4 is a diagram illustrating an example of a flowchart of a peak cut control zone setting process. This flowchart is started when the power of the air conditioner 100 is turned on and the operation mode is set to the normal heating mode.
  The outdoor control unit 211 determines whether the operation mode is set to the high temperature air mode (step S101). The outdoor control unit 211 can determine whether the operation mode is set to the high temperature air mode by determining whether the high temperature air notification is received.
  When the outdoor control unit 211 determines that the operation mode is set to the high-temperature air mode (YES in step S101), the outdoor control unit 211 executes a stabilization process described later (step S102). Thereafter, a peak cut control zone for the high-temperature air mode is set in order to increase the indoor heat exchanger temperature. At this time, the outdoor control unit 211 increases the frequency of the compressor 204 in order to increase the indoor heat exchanger temperature. In addition, the outdoor control unit 211 does not immediately set the peak cut control zone for the high-temperature air mode, but performs the stabilization process described below prior to the setting, as at the start of the heating operation, This is because in a situation where the refrigerant pressure is rising, the indoor heat exchanger temperature may exceed the start threshold value of the stop control.
  The outdoor control unit 211 sets a peak cut control zone for the high temperature wind mode after the end of the stabilization process (step S103). More specifically, taking the peak cut control zone for the high temperature wind mode of FIG. 3 as an example, the start threshold value Ds is set as the start threshold value of the drooping control. Similarly, the start threshold value Ms is set as the start threshold value for unchanged control, and the start threshold value UP is set as the start threshold value for up control.
  The outdoor control unit 211 determines whether or not the high temperature wind mode has ended (step S104). The outdoor control unit 211 can determine whether or not the hot air mode has ended by determining whether or not the hot air release notification has been received. If the outdoor control unit 211 determines that the high-temperature wind mode has not ended (NO in step S104), the outdoor control unit 211 maintains various start threshold values of the peak cut control zone for the high-temperature wind mode.
  If the outdoor control unit 211 determines that the high-temperature air mode has ended (YES in step S104), that is, determines that the operation mode has returned to the normal heating mode, it sets a normal peak cut control zone. (Step S105). More specifically, taking the normal peak cut control zone of FIG. 3 as an example, the start threshold value Df is set as the start threshold value of the drooping control. Similarly, the start threshold value Mf is set as the start threshold value for unchanged control, and the start threshold value UP is set as the start threshold value for up control. At this time, the outdoor control unit 211 reduces the frequency of the compressor 204 in order to reduce the indoor heat exchanger temperature. When it is determined in step S101 that the operation mode is not the high temperature air mode (NO in step S101), that is, when it is determined that the operation mode is the normal heating mode, the outdoor control unit 211 performs normal peak cut control. A zone is set (step S105).
  The outdoor control unit 211 determines whether the power of the air conditioner 100 is turned off or the operation mode is switched to another mode (step S106). When the outdoor control unit 211 determines that the air conditioner 100 is not turned off and the operation mode is not switched to another mode (NO in step S106), the outdoor control unit 211 returns to step S101. If the outdoor control unit 211 determines that the power of the air conditioner 100 has been turned off or the operation mode has been switched to another mode (YES in step S106), the series of processing ends.
  FIG. 5 is a diagram illustrating an example of a flowchart of the stabilization process. The outdoor control unit 211 sets a normal peak cut control zone prior to setting the peak cut control zone for the high-temperature air mode (step S201).
  The outdoor control unit 211 determines whether or not the indoor heat exchanger temperature is equal to or higher than the start threshold value for the up control (step S202). Taking FIG. 3 as an example, the outdoor control unit 211 determines whether the indoor heat exchanger temperature is equal to or higher than the start threshold value UP.
  If the outdoor control unit 211 determines that the indoor heat exchanger temperature is lower than the start threshold value of the up control (NO in step S202), the outdoor control unit 211 waits as it is. That is, it waits for the indoor heat exchanger temperature to rise. When it is determined that the indoor heat exchanger temperature is equal to or higher than the start threshold for the up control (YES in step S202), the outdoor control unit 211 determines whether the refrigerant pressure is stable. In this embodiment, the stability of the refrigerant pressure is determined by determining whether the indoor heat exchanger temperature correlated with the refrigerant pressure is stable. Specifically, it is as follows.
  First, the outdoor control unit 211 starts a timer (step S203). Next, the outdoor control unit 211 determines whether the indoor heat exchanger temperature is within the drooping zone, the unchanged zone, or the up zone (step S204).
  When the outdoor control unit 211 determines that the indoor heat exchanger temperature is not within the drooping zone, the unchanged zone, or the up zone (NO in step S204), the indoor heat exchanger temperature is not stable. Is determined. In this case, it is determined whether the indoor heat exchanger temperature is within the return zone (step S205). More specifically, it is determined whether the indoor heat exchanger temperature is lower than the start threshold value for up-control.
  If the outdoor control unit 211 determines that the indoor heat exchanger temperature is within the return zone (YES in step S205), the outdoor control unit 211 returns to step S202. On the other hand, when it is determined that the indoor heat exchanger temperature is not within the return zone (NO in step S205), the indoor heat exchanger temperature is within the stop zone. That is, the stop threshold is exceeded. In this case, since the outdoor control unit 211 stops the compressor 204, the peak cut control zone setting process ends.
  When it is determined in step S204 that the indoor heat exchanger temperature is within the drooping zone, the unchanged zone, or the up zone (YES in step S204), the outdoor control unit 211 sets the preset time. It is determined whether or not elapses (step S207). If the outdoor control unit 211 determines that the preset time has not elapsed (NO in step S207), the outdoor control unit 211 returns to step S204. If the outdoor control unit 211 determines that the preset time has elapsed (YES in step S207), the outdoor control unit 211 determines that the indoor heat exchanger temperature is stable, and ends the series of processes.
(7) Features of the air conditioner The air conditioner 100 of the present embodiment reduces the number of rotations of the indoor fan 302 and reduces the operating frequency of the compressor 204 when the operation mode is set to the high temperature air mode. By increasing the temperature, the temperature of the indoor heat exchanger is increased. At this time, if the indoor heat exchanger temperature rises too much, that is, if the refrigerant pressure rises too much, the compressor 204 stops.
  In the air conditioner 100 of the present embodiment, the outdoor control unit 211 performs frequency control under the second condition after performing frequency control under the first condition when the operation mode is set to the high temperature wind mode. That is, the outdoor control unit 211 does not immediately perform frequency control under the second condition when the operation mode is set to the high-temperature wind mode, but prior to frequency control under the second condition. Perform frequency control below. Prior to the frequency control under the second condition, the excessive increase in the refrigerant pressure is suppressed by performing the frequency control under the first condition set at the first suppression level at which the refrigerant pressure suppression level is higher. Can do.
  In the air conditioner 100 of the present embodiment, the time during which the indoor heat exchanger temperature is maintained in the droop zone, the non-change zone, or the up zone in the normal peak cut control zone is a preset time. In the case of reaching, the outdoor control unit 211 shifts from the frequency control under the first condition to the frequency control under the second condition. Since the shift to the frequency control under the second condition is performed after the stability of the indoor heat exchanger temperature, that is, the stability of the refrigerant pressure is ensured, an excessive increase in the refrigerant pressure can be suppressed.
  In the air conditioner 100 of the present embodiment, the first condition set to the first suppression level is a condition in which the start threshold value of the drooping control is set to the start threshold value Df. The second condition set to the second suppression level is a condition where the start threshold value of the drooping control is set to the start threshold value Ds. The outdoor control unit 211 performs drooping control at an earlier stage under the first condition than at the second condition. Therefore, an excessive increase in the refrigerant pressure can be suppressed.
  Here, if the start threshold value of the up control under the second condition is larger than the start threshold value of the up control under the first condition, immediately after the transition to the peak cut control zone for the high temperature wind mode, The indoor heat exchange temperature may be included in the return zone.
  In the air conditioner 100 of the present embodiment, the start threshold value for up control under the first condition is the same as the start threshold value for up control under the second condition. Therefore, when the outdoor control unit 211 shifts from the first condition to the second condition, it is easy to maintain the up control without shifting to the return zone.
  In the air conditioner 100 of the present embodiment, the start threshold value for the unchanged control under the first condition is different from the start threshold value for the unchanged control under the second condition. Therefore, it is possible to appropriately set the start threshold value for the non-change control according to the first condition and the second condition.
  In the air conditioner 100 of the present embodiment, the outdoor control unit 211 performs frequency control based on the output value of the temperature sensor 312. Therefore, the air conditioner 100 does not have to include a pressure sensor.
  In the air conditioner 100 of this embodiment, when the operation mode is set to the normal heating mode, the outdoor control unit 211 performs frequency control under the first condition. Therefore, when the operation mode is switched from the normal heating mode to the high temperature air mode, the outdoor control unit 211 continues the frequency control under the first condition, and then performs the frequency control under the second condition. That is, since some conditions are common between the case where the operation mode is set to the normal heating mode and the case where the operation mode is set to the high temperature air mode, the program can be simplified.
  In the air conditioner 100 of this embodiment, when the operation mode is switched from the high-temperature air mode to the normal heating mode, the outdoor control unit 211 performs the first condition without performing frequency control under the second condition. Control the frequency with. That is, instead of stepwise switching from frequency control under the second condition to frequency control under the first condition, the control is immediately switched to frequency control under the first condition. Thereby, compared with the case where frequency control switches in steps, the frequency of a compressor can be lowered more.
<Modification>
A modification applicable to the embodiment of the present invention will be described.
(1) Modification A
In the above description, the air conditioner 100 includes the temperature sensor 312, but may include a pressure sensor instead of or in addition to the temperature sensor 312. The pressure sensor detects the refrigerant pressure on the discharge side of the compressor 204. The outdoor control unit 211 performs frequency control of the compressor 204 according to the output value of the pressure sensor. Thereby, frequency control can be performed with higher accuracy. The outdoor control unit 211 may convert the output value of the pressure sensor into the indoor heat exchanger temperature and use it for frequency control, or convert the output value of the temperature sensor 312 into the refrigerant pressure and use it for frequency control. Also good. The output value of another sensor correlated with the refrigerant pressure may be converted into the refrigerant pressure or the indoor heat exchanger temperature and used for frequency control.
(2) Modification B
In the above description, the outdoor control unit 211 performs frequency control under the condition set at the second suppression level after performing frequency control under the condition set at the first suppression level. That is, the frequency control was switched to two stages. However, the frequency control may be switched to three or more stages. For example, a third suppression level may be set between the first suppression level and the second suppression level. In this case, the outdoor control unit 211 performs frequency control under the condition set to the second suppression level after performing the frequency control under the condition set at the first suppression level and the condition set at the third suppression level. I do.
(3) Modification C
In the above description, the high-temperature air mode is given as an example of the heating function different from the normal heating mode. However, as long as the temperature of the indoor heat exchanger 301 is higher than that in the normal heating mode, the high-temperature air mode is limited. Absent.
(4) Modification D
In the above description, the peak cut control zone includes the non-change zone, but may not include the non-change zone. In the above description, the start threshold value for the up control is common to the normal peak cut control zone and the peak cut control zone for the high temperature wind mode, but may be different. For example, the start threshold value for the up control in the peak cut control zone for the high temperature air mode may be larger than the start threshold value for the up control in the normal peak cut control zone.
(5) Modification E
In the above description, the first condition and the second condition are set by changing the start threshold value of the drooping control, but may be set by changing the drooping speed of the drooping control. In this case, the start threshold value of the drooping control may be common to the first condition and the second condition. For example, the first condition is a condition in which the drooping speed is set to the first speed, and the second condition is a condition in which the drooping speed is set to the second speed. The first speed is faster than the second speed. As described above, if the first speed is higher than the second speed, an excessive increase in the refrigerant pressure is suppressed by performing the frequency control under the first condition prior to the frequency control under the second condition. be able to.
(6) Modification F
In the above description, when the operation mode is switched from the hot air mode to the normal heating mode, the outdoor control unit 211 performs frequency control under the first condition without performing frequency control under the second condition. However, prior to the frequency control under the first condition, the frequency control may be performed under the second condition. In other words, the frequency control under the second condition may be switched stepwise from the frequency control under the first condition.
(7) Modification G
In the above description, when the operation mode is set to the hot air mode, the outdoor control unit 211 sets the maximum value that can be set as the indoor target temperature in order to increase the operation frequency. Δd itself may be set to a maximum value that can be set. The smaller the difference between the maximum value of the target temperature and the actual temperature, the more difficult it is to increase the operating frequency. This is particularly effective when the actual temperature is relatively high.
  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the above-mentioned embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above-described embodiments. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.
  The execution order of each process such as operation, procedure, step, and stage in the apparatus, program, and method shown in the claims, the description, and the drawings is particularly “before”, “prior”, etc. It should be noted that it can be implemented in any order unless explicitly stated and the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.
DESCRIPTION OF SYMBOLS 100 Air conditioner 204 Compressor 207 Outdoor heat exchanger 211 Outdoor control part 301 Indoor heat exchanger 311 Indoor control part 312 Temperature sensor
JP-A-5-87391

Claims (8)

  1. A compressor (204) capable of changing the frequency;
    An indoor heat exchanger (301) for generating conditioned air by exchanging heat between the refrigerant circulated by the compressor and room air;
    An outdoor heat exchanger (207) for exchanging heat between the refrigerant and outdoor air;
    A setting unit (311) for setting an operation mode;
    A control unit (211) for performing frequency control of the compressor;
    With
    When the operation mode is set to the second heating mode in which the conditioned air having a temperature higher than that of the first heating mode is generated, the control level of the refrigerant pressure is set to the first suppression level. After performing the frequency control under one condition, performing the frequency control under a second condition where the suppression level is set to a second suppression level lower than the first suppression level ,
    The time during which the refrigerant pressure is maintained within a preset range is preset.
    When the time reaches the second time, the control unit performs the second control from the frequency control under the first condition.
    Transition to the frequency control under conditions,
    Air conditioner (100).
  2. The first condition set to the first suppression level is a condition in which the starting threshold value of the drooping control is set to the first threshold value,
    The second condition set to the second suppression level is a condition where the start threshold is set to the second threshold,
    The drooping control is included in the frequency control, and is a control that droops the frequency,
    The second threshold is greater than the first threshold;
    The air conditioner according to claim 1 .
  3. The frequency control includes at least one of up control and unchanged control,
    The up control is a control for increasing the frequency,
    The non-change control is control for maintaining the frequency,
    In at least one of the up control under the first condition, the up control under the second condition, the non-change control under the first condition, and the non-change control under the second condition The control unit sets different start thresholds,
    The air conditioner according to claim 2 .
  4. The start threshold of the up control under the first condition is the same as the start threshold of the up control under the second condition;
    The air conditioner according to claim 3 .
  5. A condenser (301);
    A temperature sensor (312) for detecting the temperature of the condenser;
    Further comprising
    The control unit performs the frequency control based on an output value of the temperature sensor.
    The air conditioner according to any one of claims 1 to 4 .
  6. A pressure sensor for detecting the refrigerant pressure on the discharge side of the compressor;
    The control unit performs the frequency control based on an output value of the pressure sensor.
    The air conditioner according to any one of claims 1 to 4 .
  7. When the operation mode is set to the first heating mode, the control unit performs the frequency control under the first condition.
    The air conditioner according to any one of claims 1 to 6 .
  8. When the operation mode is switched from the second heating mode to the first heating mode, the control unit performs the frequency control under the first condition.
    The air conditioner according to any one of claims 1 to 7 .
JP2015215194A 2015-10-30 2015-10-30 Air conditioner Active JP6350485B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015215194A JP6350485B2 (en) 2015-10-30 2015-10-30 Air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015215194A JP6350485B2 (en) 2015-10-30 2015-10-30 Air conditioner

Publications (2)

Publication Number Publication Date
JP2017083145A JP2017083145A (en) 2017-05-18
JP6350485B2 true JP6350485B2 (en) 2018-07-04

Family

ID=58710619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015215194A Active JP6350485B2 (en) 2015-10-30 2015-10-30 Air conditioner

Country Status (1)

Country Link
JP (1) JP6350485B2 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0387554A (en) * 1989-08-31 1991-04-12 Mitsubishi Heavy Ind Ltd High temperature air blow control method of air conditioner
JPH04158171A (en) * 1990-10-23 1992-06-01 Fujitsu General Ltd Air conditioner
JPH06159823A (en) * 1992-11-25 1994-06-07 Toshiba Corp Air conditioner
JP3119046B2 (en) * 1993-09-01 2000-12-18 ダイキン工業株式会社 Air conditioner condition monitoring device
JPH1089782A (en) * 1996-09-19 1998-04-10 Daikin Ind Ltd Air conditioner
US8838277B2 (en) * 2009-04-03 2014-09-16 Carrier Corporation Systems and methods involving heating and cooling system control
JP6079852B1 (en) * 2015-10-30 2017-02-15 ダイキン工業株式会社 Air conditioner

Also Published As

Publication number Publication date
JP2017083145A (en) 2017-05-18

Similar Documents

Publication Publication Date Title
JP6079852B1 (en) Air conditioner
JP5692302B2 (en) Air conditioner
JP5182358B2 (en) Refrigeration equipment
JP6071648B2 (en) Air conditioner
JP2008039234A (en) Air conditioner
JP6338761B2 (en) Air conditioning system
JP2011069570A (en) Heat pump cycle device
JP2011144960A (en) Air conditioner and method of defrosting operation of air conditioner
JPWO2019003306A1 (en) Air conditioner
JP2008241065A (en) Refrigerating device and oil returning method of refrigerating device
JP5783215B2 (en) Air conditioner
JPWO2016125239A1 (en) Refrigeration air conditioner
WO2014103620A1 (en) Refrigeration device
KR101570644B1 (en) Refrigeration device
JP6045440B2 (en) Air conditioner control device
JP6403413B2 (en) Air conditioner
JP5492625B2 (en) Air conditioner
JP6350485B2 (en) Air conditioner
JPWO2020003490A1 (en) Air conditioner
WO2019026731A1 (en) Air-conditioning device
JP6537641B2 (en) Hot and cold air conditioning system
JP6338762B2 (en) Air conditioner
JP2016183830A (en) Controller of air conditioning system, air conditioning system, control program of air conditioning system, and control method of air conditioning system
JP2018141600A (en) Air conditioner
JP6415612B2 (en) Refrigeration cycle equipment

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20170822

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20171003

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20171117

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20180508

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180521

R151 Written notification of patent or utility model registration

Ref document number: 6350485

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151