JP2014190600A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that the overshoot of supplied heat quantity is large, an indoor temperature reaches a set temperature in a breath, and a compressor turns into a thermo Off-state again before operating frequency falls if an air conditioning load is light and an air conditioning capability is higher than a required capability with respect to a capability required in an air-conditioning target room, and that a phenomenon that the compressor restarts after the room temperature returns to normal is repeated.SOLUTION: If a compressor turns into a thermo OFF-state during operation and the compressor starts operating again from the thermo Off-state, an operating frequency of the compressor quickly decreases by changing a compressor control coefficient table to that for quickly reducing the operating frequency of the compressor of which a temperature difference coefficient set to be small.

Description

  The present invention relates to an air conditioner having a function of reducing the number of times of thermo-on / off.

  Some conventional air conditioner operation control devices have a table that defines the zones based on the difference between the room temperature and the set temperature, and associates each zone with the compressor operating frequency. Some have a table of (frequency change value from current frequency). 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 apparatus, when the air-conditioning load is small or when the thermo-off is restored, the compressor 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 the operating frequency is greater than the required capacity, the operating frequency will also decrease due to room temperature change, but the overshoot of the heat supply will be large, reaching the set room temperature all at once, before the compressor operating frequency decreases again It becomes a thermo-off state. After that, the room temperature returns and the compressor starts again, but there is a problem that the comfort is remarkably impaired by repeating the above-mentioned phenomenon.

  In order to solve the above-described conventional problems, the present invention provides an indoor suction temperature detecting means for detecting indoor temperature by sucking indoor air, an operation mode storage means for detecting an indoor temperature set by a remote controller, and an indoor suction A differential temperature setting means for calculating the differential temperature from the outputs of the temperature detection means and the operation mode storage means; and a frequency determination means for determining the compressor operating frequency based on the compressor control coefficient table based on the output of the differential temperature setting means. If the air conditioner is turned off during operation and the compressor starts operation again from the thermo-off state, the compressor is changed to a compressor control coefficient table in which the differential temperature coefficient is set low and the operating frequency of the compressor is lowered quickly. It is characterized by doing.

  The air conditioner of the present invention compresses the air conditioner earlier than usual when the temperature difference between the indoor suction temperature and the remote controller set temperature becomes small in an environmental condition where the air conditioning load is small and the thermo-on and off are repeated frequently. By operating at a lower machine operating frequency, the number of thermo-ONs and OFFs can be reduced and the comfort of the equipment can be improved.

Refrigeration cycle circuit diagram in the first and second embodiments of the present invention Control block diagram in the first and second embodiments of the present invention Schematic transition diagram of compressor operating frequency and room temperature in Embodiments 1 and 2 of the present invention Flowchart in Embodiment 1 of the present invention Flowchart in Embodiment 2 of the present invention

  The present invention relates to an indoor suction temperature detecting means for detecting a room temperature by sucking indoor air, an operation mode storage means for detecting a room temperature set by a remote controller, and an output of the indoor suction temperature detecting means and the operation mode storage means. An air conditioner equipped with a differential temperature setting means for calculating the differential temperature from the output, and a frequency determination means for determining the compressor operating frequency based on the compressor control coefficient table based on the output of the differential temperature setting means. When the compressor is restarted from the thermo-off state, the thermo-on / off is frequently changed by changing to the compressor control coefficient table in which the differential temperature coefficient is set low and the operating frequency of the compressor is lowered quickly. In the case of repeated environmental conditions, the compressor is operated with the compressor operating frequency of the air conditioner lowered earlier than usual, and the number of times the thermo is turned on and off. Reduced, thereby improving the comfort of the equipment.

(Embodiment 1)
1 is a refrigeration cycle circuit diagram of an air conditioner according to Embodiment 1 of the present invention, FIG. 2 is a control block diagram of the air conditioner according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. Compressor operating frequency and room temperature transition conceptual diagram in Embodiment 1, FIG. 4 shows a flowchart in 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 “compressor 2”), an outdoor heat exchanger 3, an outdoor fan 4, and an air conditioning switching unit. A four-way valve 5 is provided.

  On the other hand, the indoor unit 7 is provided with an indoor blower 8 and an indoor heat exchanger 9. The outdoor unit 1 and the indoor unit 7 are connected to the liquid side connection portion 14 and the gas side by the refrigerant liquid pipe 12 and the refrigerant gas pipe 13. They are connected by a connection unit 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 setting device (remote control) 10 that can set an operation mode (cooling, dehumidification or heating) desired by a resident, room temperature, and operation or stop.

  In the refrigeration cycle configured as described above, 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 the outdoor fan 4 is driven to drive the outdoor heat exchanger. After the heat exchange with the outdoor air at 3, the liquid is condensed and liquefied, the flow rate is controlled by the electric expansion valve 6 through the refrigerant liquid pipe 12 and evaporated by the indoor heat exchanger 9, and then again through the refrigerant gas pipe 13 and four-way valve 5 It is sucked into the compressor 2. 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 load in the room, the refrigerant is also controlled at a flow rate corresponding to the room 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. Then, 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, control of the air conditioner of the present invention will be described with reference to FIGS.

  In addition, Table 1 is a table | surface which shows the relationship between the temperature difference between the room temperature in which the air conditioning apparatus was installed, and preset temperature, and a compressor control value 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, and an indoor air volume setting switch 19. The air conditioner is operated / stopped by the operation mode storage device 22 for storing each signal of the operation setting device 10 constituted by the indoor air direction setting switch 20 and the temperature difference between the indoor suction temperature and the indoor temperature setting value. A differential temperature setting device 23 that selects a compressor control value table, a determination device 24 that receives a signal from the indoor suction temperature detection device 11 every sampling time and determines an operation state, and a time setting that sets the operation time of the compressor 2 Frequency determining means for determining the operating (driving) frequency of the compressor 2 based on the device 26 and their signals, the number of rotations of the blower is determined, And an output relay circuit 25 for performing a control such as wind machines 4.

  When a resident selects, for example, heating in the operation setting device 10 and starts operation at a temperature setting Ta (for example, 32 ° C. here) (S1, S2), the indoor unit 7 detects the indoor suction temperature Thin (S3), A temperature difference TX between the value Ta of the temperature setting switch 18 and the indoor suction temperature Thin of the indoor suction temperature detector 11 is calculated (S4). Here, it is determined whether or not the device is experiencing a thermo-off (S5). If the device is not experiencing a thermo-off, the operating frequency is calculated from the compressor control value table A (Table 1) and the temperature difference, and the compressor 2 (S6). On the other hand, when the device has experienced a thermo-off, the normal compressor control value table A is changed to the compressor control value table B (S7), and the changed compressor control value table B (Table 1) and the differential temperature are changed. To calculate the operating frequency and operate the compressor 2 (S8).

Here, since the compressor control value table B is changed from the value of the normal compressor control value table A so that the coefficient of the zone having a small temperature difference is lowered, the air conditioner as shown in FIG. In the environment where the air conditioning load is low, such as after the thermo is turned off and on, when the temperature difference between the indoor suction temperature and the remote controller set temperature becomes small, the air conditioner operates at a lower compressor operating frequency earlier than usual. By reducing the performance of the air conditioner and performing control so that the room temperature is easily removed from the thermo-off region, the number of times of thermo-on and off is reduced, and the comfort of the device is improved.

  In addition, the value of the operating frequency of TBn (n = 1-16) of Table 1 is a value lower than the value of the operating frequency of TAn (n = 1-16).

(Embodiment 2)
1 is a refrigeration cycle circuit diagram of an air conditioner according to Embodiment 2 of the present invention, FIG. 2 is a control block diagram of the air conditioner according to Embodiment 2 of the present invention, and FIG. 3 is an embodiment of the present invention. Compressor operating frequency and room temperature transition conceptual diagram in Embodiment 2, FIG. 5 shows a flowchart in Embodiment 2 of the present invention.

  In the present embodiment, configurations (functions) common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  When the resident selects, for example, heating with the operation setting device (remote controller) 10 and starts operation with a temperature setting Ta (for example, 32 ° C. here) (S1, S2), the indoor unit 7 detects the indoor suction temperature Thin (S3). ) A temperature difference TX between the value Ta of the room temperature setting switch 18 and the room suction temperature Thin of the room suction temperature detecting device 11 is calculated (S4). Here, it is determined whether or not the device has experienced a thermo-off (S5). If the device has not experienced a thermo-off, the operation frequency is calculated from the compressor control value table A (Table 1) and the differential temperature, and the compressor 2 Operation is performed (S6). On the other hand, when the device has experienced a thermo-off, the normal compressor control value table A is changed to the compressor control value table B (S7), and the changed compressor control value table B (Table 1) and the differential temperature are changed. To calculate the operating frequency and operate the compressor 2 (S8). Further, it is determined whether a predetermined time T1 has elapsed since the thermo-off (S9). When the predetermined time T1 has elapsed, it is determined that the room temperature is sufficiently stable, the thermo-off experience memory is deleted, and the compressor control value table B is changed to the normal compressor control value table A.

  According to this configuration, when the air conditioner is in an environment where the air conditioning load is low, such as after the thermo is turned off and on, the air conditioner compresses earlier than usual when the temperature difference between the indoor suction temperature and the set temperature of the remote control becomes small. Operates at a lower machine operating frequency, lowers the performance of the air conditioner, and controls the room temperature to be more easily removed from the thermo-off area, thereby reducing the number of times the thermo is turned on and off and improving the comfort of the equipment.

  As described above, the air conditioner according to the present invention operates in an environment where the air conditioning load that repeats thermo-ON and OFF in a short time is low and the air conditioner lowers the compressor operating frequency earlier than normal. Thus, it is possible to prevent room temperature hunting 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 (remote control)
DESCRIPTION OF SYMBOLS 11 Indoor suction temperature detection apparatus 12 Refrigerant liquid pipe 13 Refrigerant gas pipe 14 Liquid side connection part 15 Gas side connection part 16 Operation stop switch 17 Operation mode switch 18 Indoor temperature setting switch 19 Indoor air volume setting switch 20 Indoor air direction setting switch 21 Control Device 22 Operation mode storage device 23 Differential temperature setting device 24 Judgment device 25 Output relay circuit 26 Time setting device

Claims (2)

From the output of the indoor suction temperature detecting means for detecting the indoor temperature by sucking indoor air, the operation mode storage means for detecting the indoor temperature set by the remote controller, the output of the indoor suction temperature detecting means and the operation mode storage means An air conditioner comprising differential temperature setting means for calculating a differential temperature and frequency determining means for determining a compressor operating frequency based on a compressor control coefficient table based on an output of the differential temperature setting means, during operation An air conditioner characterized by changing to a compressor control coefficient table in which the differential temperature coefficient is set to a small value and the operating frequency of the compressor is quickly lowered when the compressor is started again from the thermo-off and thermo-off state. The air conditioner according to claim 1, wherein the compressor starts operating again from a thermo-off state, and the compressor control coefficient table is restored after a predetermined time has elapsed.