JP2015021656A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which comfort is greatly impaired as a phenomenon is repeated in which in the case where an air conditioning load is small or when returning from thermo-off, with respect to capacity required by an air-conditioned room, when the capacity of an air conditioner corresponding to operation frequency determined by a zone which is determined from deviation between a room temperature and a preset temperature is larger than required capacity, even though the operation frequency decreases by room temperature change, as overshoot of a supply heat amount is large, the preset room temperature is attained instantly, and the air conditioner becomes a thermo-off state again before the operation frequency decreases, and after that, when the room temperature returns, a compressor starts again.SOLUTION: In an air conditioner in which, during an operation of the air conditioner, when a calculated value of a temperature difference setting device reaches a predetermined temperature, and the state continues for first predetermined time, a compressor is stopped and the air conditioner comes into a thermo-off state, an operation is performed for second predetermined time out of the first predetermined time, with operation frequency of the compressor being the lowest frequency with which the air conditioner is operable.

Description

  The present invention relates to an air conditioner that operates by reducing the frequency to the lowest operable frequency.

  Some conventional air conditioner operation control devices define zones based on the difference between room temperature and set temperature, and have a table that associates each zone with the operating frequency. Some have a table of frequency change values. For example, at the time of start-up, the operation is performed at a high frequency in a zone having a large deviation, and the room temperature is stabilized, that is, the operation is performed at a low frequency in a zone having a small deviation (see, for example, Patent Document 1).

JP 57-67735 A

  However, in the conventional device, when the air conditioning load is small or when the thermostat is off, the operating frequency determined by the zone determined from the deviation between the room temperature and the set temperature with respect to the capacity required in the air-conditioned room If the capacity of the air conditioner corresponding to is larger than the required capacity, the operating frequency also decreases due to room temperature change, but the overshoot of the supply heat amount is large, the set room temperature is reached at once, and the thermo-off state is entered again before the operating frequency decreases . Thereafter, when the room temperature returns, the compressor starts again, but there is a problem that the above phenomenon is repeated and the comfort is remarkably impaired.

  An air conditioner according to the present invention includes an indoor suction temperature detection device that detects a room temperature by sucking indoor air, an operation mode storage device that stores a room temperature set by a remote controller, an indoor suction temperature detection device, and an operation A differential temperature setting device that calculates the differential temperature from the output of the mode storage device, and an output relay circuit that determines the operating frequency of the compressor based on the output of the differential temperature setting device, and during operation of the air conditioner When the calculated value of the differential temperature setting device reaches a predetermined temperature and the state continues for a first predetermined time, the second air-conditioner in the first predetermined time is stopped in the air conditioner that stops the compressor and enters the thermo-off state. The compressor is operated at a minimum frequency at which the air conditioner can be operated for a predetermined time.

  The present invention provides the lowest frequency at which the air conditioner can be operated earlier than usual when the temperature difference between the indoor suction temperature and the set temperature of the remote control is small in the case of an environmental condition where the air conditioning load is small and the thermo-on and off are repeated frequently. By operating at a reduced frequency, the number of times the thermo is turned on and off is reduced, and the comfort of the device is improved.

Refrigeration cycle diagrams in Embodiments 1, 2, and 3 of the present invention Control block diagram in the first, second and third embodiments of the present invention Flowchart in Embodiment 1 of the present invention Flowchart in Embodiment 2 of the present invention Flowchart in Embodiment 3 of the present invention

  The present invention relates to an indoor suction temperature detection device that detects indoor temperature by sucking indoor air, an operation mode storage device that stores a room temperature set by a remote controller, an indoor suction temperature detection device, and an operation mode storage device. A differential temperature setting device that calculates the differential temperature from the output, and an output relay circuit that determines the operating frequency of the compressor based on the output of the differential temperature setting device, and sets the differential temperature during operation of the air conditioner When the calculated value of the device reaches a predetermined temperature and the state continues for the first predetermined time, in the air conditioner that stops the compressor and enters the thermo-off state, the second predetermined time within the first predetermined time, By operating the compressor at the lowest frequency at which the air conditioner can operate, the ambient suction temperature and the remote controller set temperature are When the differential temperature is reduced by early air conditioner than normal perform driving drop the frequency to the lowest frequency that can be operated, thermo, reduces the number of off, thereby improving the comfort of the device.

(Embodiment 1)
FIG. 1 is a refrigeration cycle diagram of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a control block diagram thereof, and FIG. 3 is a flowchart according to Embodiment 1 of the present invention.

  In FIG. 1, an outdoor unit 1 includes an inverter-driven capacity (frequency) variable compressor 2 (hereinafter simply referred to as a compressor), an outdoor heat exchanger 3, an outdoor blower 4, and a four-way valve 5 for switching between cooling and heating. Is provided.

  On the other hand, the indoor unit 7 is provided with an indoor blower 8 and an indoor heat exchanger 9, and the outdoor unit 1 and the indoor unit 7 are connected to the liquid side connection portion by connecting pipes (refrigerant liquid pipe 12 and refrigerant gas pipe 13). 14 and the gas side connection part 15.

  The refrigerant liquid pipe 12 of the liquid side connection portion 14 is provided with an electric expansion valve 6 whose valve opening degree can be controlled by a stepping motor or the like, for example.

  Further, the indoor unit 7 is provided with an operation mode changeover switch 17 for selecting an operation mode (cooling, dehumidification or heating) desired by a resident, and an operation setting device 10 capable of setting room temperature and operation or stop.

  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 5, and is driven by the outdoor heat exchanger 3 by driving the outdoor blower 4. After exchanging heat with the outdoor air to condense and liquefy, flow through the refrigerant liquid pipe 12 and control the flow rate of the refrigerant with the electric expansion valve 6 and evaporate with the indoor unit 7, and then again with the compressor through the refrigerant gas pipe 13 and the four-way valve 5. 2 is inhaled. Since this electric expansion valve 6 is pulse-controlled by a stepping motor or the like so as to have an opening corresponding to the indoor load, the refrigerant is also controlled at a flow rate corresponding to the indoor load.

  On the other hand, during the heating operation, the refrigerant discharged from the compressor 2 flows to the indoor heat exchanger 9 through the four-way valve 5, and exchanges heat with indoor air in the indoor heat exchanger 9 by driving the indoor blower 8. It is condensed and liquefied, the flow rate is controlled by the electric expansion valve 6, evaporated by the outdoor heat exchanger 3, and then sucked into the compressor 2 again through the four-way valve 5.

  Next, the control in Embodiment 1 of this invention is demonstrated using FIG.

  Table 1 shows the relationship between the temperature difference between the temperature in the room where the air conditioner of the present invention is installed and the set temperature, and the temperature difference signal, and Table 2 shows the thermo-off point of the air conditioner. It is a table.

The control device 21 of the air conditioner of the present invention includes an operation mode changeover switch 17 (cooling, drying, air blowing or heating) desired by a resident, an indoor temperature setting switch 18, an operation stop switch 16, an indoor air volume setting switch 19, and the like. An operation mode storage device 22 that stores a signal of the operation setting device 10 constituted by the indoor wind direction setting switch 20, and a differential temperature that stops the operation of the air conditioner based on the difference between the indoor suction temperature and the indoor temperature setting value. The setting device 23, the determination device 24 that receives the signals of the indoor suction temperature detection device 11 every sampling time, determines the operation status, the time setting device 26 that sets the operation time of the compressor, and the signals of the compressor 2 It has an output relay circuit 25 that determines the operating frequency and the rotational speed of the blower, and controls the compressor 2, the indoor blower 8, the outdoor blower 4, and the like.

  When the resident selects, for example, heating in the operation setting device 10 and starts operation at a temperature setting Ta (eg, 32 ° C. here) (S1, S2), the indoor unit 7 detects the indoor suction temperature Thin (S3), A difference temperature TX between the value Ta of the room temperature setting switch 18 and the value Thin of the room suction temperature detecting device 11 is calculated (S4), and the compressor 2 is operated at an operation frequency corresponding to the difference temperature (S5). When the temperature TX is lower than the value of the differential temperature setting device 23 (here, for example, T7 in Table 1), the operation of the compressor 2 is continued (S6). When the temperature TX is higher, the state is t1 hours (here, for example, 2 minutes). ) If continued (S6), the operating frequency of the compressor 2 is reduced to the minimum frequency (here, for example, 10 Hz) (S7), and the temperature difference TX is determined from the value of the temperature difference setting device 23 (here, for example, T7 in Table 1), The higher state is t2 hours (here (For example, 1 minute) When the operation is continued (S8), the compressor is stopped (S9), and the difference temperature TX changes to a state lower than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1). The operation of the compressor 2 is continued at an operation frequency corresponding to the temperature (S5).

  According to this configuration, when the temperature difference between the indoor suction temperature and the set temperature of the remote control is reduced and the temperature difference is lowered to the thermo-off region, the operation is performed with the frequency lowered to the lowest frequency at which the air conditioner can be operated. By reducing the performance of the harmony machine to the minimum and controlling the room temperature to be more easily removed from the thermo-off area, the number of thermo-on / off operations is reduced and the comfort of the equipment is improved.

(Embodiment 2)
FIG. 4 is a flowchart in the second embodiment. Hereinafter, the control in the second embodiment will be described with reference to FIG.

  When the resident selects, for example, heating in the operation setting device 10 and starts operation at a temperature setting Ta (eg, 32 ° C. here) (S1, S2), the indoor unit 7 detects the indoor suction temperature Thin (S3), A differential temperature TX between the value Ta of the indoor temperature setting switch 18 and the value Thin of the indoor suction temperature detector 11 is calculated (S4), and the compressor 2 is operated at an operation frequency corresponding to the differential temperature (S5). When the thermo-off has not been experienced even once from the start (S10), when the differential temperature TX is lower than the value of the differential temperature setting device 23 (here, T7 in Table 1, for example), the operation of the compressor 2 is continued (S11). When it is high, the state continues for t1 time (here, for example, 2 minutes) (S11). When the operating frequency of the compressor 2 is lowered to the minimum frequency (here, for example, 10 Hz) (S12), the temperature difference TX is set to the temperature difference. Value of device 23 Here, for example, when the state higher than T7 in Table 1 continues for t2 hours (here, for example, 1 minute) (S13), the compressor is stopped (S14), and the temperature difference TX is set to the difference temperature setting device 23. When it changes to a state lower than the value (for example, T7 in Table 1), the operation of the compressor 2 is continued at the operation frequency corresponding to the temperature difference (S5).

  When the thermo-off has been experienced even once from the start of operation (S10), when the temperature difference TX is lower than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1), the operation of the compressor 2 is continued (S15). If it is high, the state continues for t3 hours (here, for example, 1 minute) (S15). When the operating frequency of the compressor 2 is lowered to the minimum frequency (here, 10 Hz, for example) (S16), the temperature difference TX is different. When the state higher than the value of the temperature setting device 23 (for example, T7 in Table 1) continues for t4 hours (for example, 2 minutes here) (S17), the compressor is stopped (S18), and the temperature difference TX Is changed to a state lower than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1), the operation of the compressor 2 is continued at the operation frequency corresponding to the temperature difference (S5).

According to this configuration, when the air conditioner is in an environment where the air conditioning load is low, such as when the air conditioner is turned off and turned on, the temperature difference between the indoor suction temperature and the set temperature of the remote control becomes small, and the temperature difference decreases again to the thermo-off region. , Thermo-on by lowering the frequency to the lowest frequency that the air conditioner can operate earlier than normal, reducing the performance of the air conditioner to the minimum, and controlling the room temperature to be easily removed from the thermo-off region, The number of off times is reduced and the comfort of the device is improved.

(Embodiment 3)
FIG. 5 is a flowchart according to the third embodiment. Hereinafter, the control in the third embodiment will be described with reference to FIG.

  When the resident selects, for example, heating in the operation setting device 10 and starts operation at a temperature setting Ta (eg, 32 ° C. here) (S1, S2), the indoor unit 7 detects the indoor suction temperature Thin (S3), A differential temperature TX between the value Ta of the indoor temperature setting switch 18 and the value Thin of the indoor suction temperature detector 11 is calculated (S4), and the compressor 2 is operated at an operation frequency corresponding to the differential temperature (S5). If the thermo-off has never been experienced from the start (S19), the operation of the compressor 2 is continued when the differential temperature TX is lower than the value of the differential temperature setting device 23 (here, for example, T7 in Table 1) (S20). When it is high, the state continues for t1 time (here, for example, 2 minutes) (S20). When the operating frequency of the compressor 2 is lowered to the minimum frequency (here, for example, 10 Hz) (S21), the temperature difference TX is set to the temperature difference. The value of device 23 (this Here, for example, when the state higher than T7 in Table 1 continues for a further t2 hours (for example, 1 minute in this case) (S22) (S22), the compressor is stopped (S23), and the differential temperature TX is set to the differential temperature setting device 23. When it changes to a state lower than the value (for example, T7 in Table 1), the operation of the compressor 2 is continued at the operation frequency corresponding to the temperature difference (S5).

  If the thermo-off has been experienced even once since the start of operation (S19), and the compressor operation state has been continued for more than t5 hours after the thermo-ON (S24), the differential temperature TX is the value of the differential temperature setting device 23 ( Here, for example, when it is lower than T7 in Table 1, the operation of the compressor 2 is continued (S20), and when it is higher, if the state continues for t1 time (for example, 2 minutes here) (S20), the operation of the compressor 2 is continued. The frequency is lowered to the minimum frequency (here, for example, 10 Hz) (S21), and the state where the temperature difference TX is higher than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1) is further t2 hours (here, for example, 1 minute). ) If continued (S22), the compressor is stopped (S23), and if the temperature difference TX changes to a state lower than the value of the temperature difference setting device 23 (here, T7 in Table 1, for example) Operation of the compressor 2 at the operating frequency To continue (S5).

  When the thermo-off has been experienced even once from the start of operation (S19), and the compressor operation state after the thermo-ON is within t5 hours (S24), the differential temperature TX is the value of the differential temperature setting device 23 (here, for example, When it is lower than T7) in Table 1, the operation of the compressor 2 is continued (S25), and when it is higher, if the state continues for t3 hours (here, for example, 1 minute) (S25), the operation frequency of the compressor 2 is minimized. The frequency (here, for example, 10 Hz) is dropped (S26), and the temperature difference TX continues to be higher than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1) for t4 hours (here, for example, 2 minutes). In the case (S27), the compressor is stopped (S28), and when the temperature difference TX changes to a value lower than the value of the temperature difference setting device 23 (here, for example, T7 in Table 1), the operating frequency according to the temperature difference To continue the operation of the compressor 2 ( 5).

  According to this configuration, in an environment where the air conditioning load is low such that the air conditioner repeats thermo-off and on in a short time, the temperature difference between the indoor suction temperature and the set temperature of the remote controller is reduced, and the difference is reached again to the thermo-off region When the temperature drops, the frequency is reduced to the lowest frequency at which the air conditioner can operate earlier than usual, and the performance of the air conditioner is reduced to the minimum, and control is performed so that the room temperature is easily removed from the thermo-off area. This reduces the number of times the thermo is turned on and off, improving the comfort of the equipment.

  As described above, the air conditioner according to the present invention operates by reducing the frequency to the lowest frequency at which the air conditioner can be operated earlier than usual in an environment where the air conditioning load that repeats thermo-on / off in a short time is low. Accordingly, it is possible to prevent hunting at room temperature and maintain a comfortable state without frequently repeating the thermo-off, and therefore it can be applied to various air conditioners.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Outdoor heat exchanger 4 Outdoor fan 5 Four-way valve 6 Electric expansion valve 7 Indoor unit 8 Indoor fan 9 Indoor heat exchanger 10 Operation setting apparatus 11 Indoor suction temperature detection apparatus 12 Refrigerant liquid pipe 13 Refrigerant gas pipe DESCRIPTION OF SYMBOLS 14 Liquid side connection part 15 Gas side connection part 16 Operation stop switch 17 Operation mode switching switch 18 Indoor temperature setting switch 19 Indoor air volume setting switch 20 Indoor air direction setting switch 21 Controller 22 Operation mode memory | storage device 23 Differential temperature setting apparatus 24 Determination apparatus 25 Output relay circuit 26 Time setting device

Claims (3)

  From the output of the indoor suction temperature detection device that detects the indoor temperature by sucking indoor air, the operation mode storage device that stores the indoor temperature set by the remote controller, the output of the indoor suction temperature detection device, and the operation mode storage device A differential temperature setting device that calculates the differential temperature; and an output relay circuit that determines an operating frequency of the compressor based on an output of the differential temperature setting device. When the calculated value of the device reaches a predetermined temperature and the state continues for the first predetermined time, in the air conditioner that stops the compressor and enters the thermo-off state, the second predetermined time within the first predetermined time, The air conditioner is operated at an operation frequency of the compressor at a lowest frequency at which the air conditioner can operate.   2. The air conditioner according to claim 1, wherein when the compressor starts operation again from a thermo-off state, the air conditioner is changed so as to extend the second predetermined time.   3. The air conditioner according to claim 2, wherein when the compressor starts operating again from a thermo-off state and a third predetermined time has elapsed, the second predetermined time is restored.