JP6877644B2 - Refrigeration cycle equipment, air conditioner and hot water supply equipment - Google Patents

Description

The present invention relates to a refrigeration cycle device having an outdoor unit including a compressor, a fan, a linear electronic expansion valve and an outdoor control board, and an air conditioner and a hot water supply device having a refrigeration cycle device.

It has a temperature sensor arranged on the outdoor heat exchanger side, detects the temperature at predetermined time intervals by the temperature sensor regardless of whether it is operating or stopped, and the outside air temperature is based on the detected temperature. An air conditioner for grasping the above has been proposed (see, for example, Patent Document 1). The air conditioner described in Patent Document 1 grasps immediately before the air conditioner when the difference between the outside air temperature grasped immediately before and the current temperature detected by the temperature sensor is larger than a predetermined temperature while the operation is stopped. It has a control means for holding the outside air temperature as the current outside air temperature.

Japanese Patent No. 3092532

However, in the above-mentioned conventional technique, since the temperature sensor is separated from the control means, it is necessary to connect the temperature sensor to the control means via a lead wire and a connector. If vibration occurs beyond expectations, or if the board is replaced in the market, the lead wire may be cut or the connector may be disconnected, and the control means may not be able to detect the outside air temperature, causing the air conditioner to operate. There is a risk that it will not be possible.

The present invention has been made in view of the above, and refrigeration capable of detecting or estimating the outside air temperature even when vibration exceeding expectations occurs or when the substrate is replaced. The purpose is to obtain a cycle device.

To solve the above problems and achieve the object, the outdoor refrigeration cycle apparatus according to the present invention, comprising a compressor for compressing a refrigerant, a fan, you adjust the flow rate of the refrigerant Rise expansion valve, and an outdoor control board It is a refrigeration cycle device having a machine. The compressor includes a compressor motor. The outdoor unit is provided on the outdoor control board, and further includes an inverter module for driving the compressor motor and a temperature detection unit provided inside the inverter module. The outdoor unit is provided on the outdoor control board, estimates the outside air temperature, which is the outside air temperature of the outdoor unit, based on the temperature detected by the temperature detector while the compressor is stopped, and detects it by the temperature detector. based temperature or estimated outside air temperature, further comprising rotational speed per unit of the compressor time, number of revolutions per unit of fans time, the control unit for controlling the opening of及beauty Rise expansion valve. The control unit rotates the fan in the direction opposite to the normal direction while the compressor is stopped.

The refrigeration cycle apparatus according to the present invention has the effect of being able to detect or estimate the outside air temperature even when vibrations exceeding expectations occur or when the substrate is replaced.

The figure which shows the structure of the refrigerating cycle apparatus which concerns on Embodiment 1. The figure which shows the structure of the outdoor unit which the refrigerating cycle apparatus which concerns on Embodiment 1 has. A flowchart showing an operation procedure of a control unit included in an outdoor unit included in the refrigeration cycle apparatus according to the first embodiment. The figure for demonstrating the operation at the time of estimating the outside air temperature by the control part included in the outdoor unit included in the refrigerating cycle apparatus which concerns on Embodiment 1. Part or all of the linear electronic expansion valve, inverter module, temperature detection unit, power module, linear electronic expansion valve drive unit, four-way valve drive unit, and control unit of the outdoor unit of the refrigeration cycle device according to the first embodiment. Diagram showing a processor when the function is realized by the processor Part or all of the linear electronic expansion valve, inverter module, temperature detection unit, power module, linear electronic expansion valve drive unit, four-way valve drive unit, and control unit of the outdoor unit of the refrigeration cycle device according to the first embodiment. The figure which shows the processing circuit when it is realized by the processing circuit The figure which shows the structure of the air conditioner which concerns on Embodiment 1. The figure which shows the structure of the hot water supply device which concerns on Embodiment 1. A flowchart showing an example of the operation procedure of the control unit included in the outdoor unit included in the refrigeration cycle apparatus according to the second embodiment. The figure for demonstrating the operation at the time of estimating the outside air temperature by the control part included in the outdoor unit included in the refrigerating cycle apparatus which concerns on Embodiment 2.

Hereinafter, the refrigeration cycle device, the air conditioner, and the hot water supply device according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
First, the configuration of the refrigeration cycle apparatus 1 according to the first embodiment will be described. FIG. 1 is a diagram showing a configuration of a refrigeration cycle device 1 according to a first embodiment. The refrigeration cycle device 1 includes an indoor unit 2, an outdoor unit 3, and a pipe 4 through which a refrigerant flows. The pipe 4 connects the indoor unit 2 and the outdoor unit 3.

The outdoor unit 3 includes a compressor 5 for compressing the refrigerant, a fan 6, a linear electronic expansion valve 7 for adjusting the flow rate of the refrigerant, a four-way valve 8 for switching the flow path of the refrigerant, and a heat exchanger 9. It has an outdoor control board 10. In the following, the linear electronic expansion valve may be referred to as "LEV". A compressor 5, a LEV 7, a four-way valve 8, a heat exchanger 9, an indoor unit 2, and a pipe 4 form a refrigeration cycle.

FIG. 2 is a diagram showing a configuration of an outdoor unit 3 included in the refrigeration cycle device 1 according to the first embodiment. FIG. 2 also shows the indoor unit 2 and the pipe 4. The outdoor control board 10 is connected to the compressor 5, the fan 6, the LEV 7, and the four-way valve 8. The compressor 5 includes a compressor motor 5a. The fan 6 includes a fan motor 6a.

The outdoor unit 3 further includes an inverter module 11 for driving the compressor motor 5a. The inverter module 11 is provided on the outdoor control board 10. The outdoor unit 3 further includes a temperature detection unit 12 provided inside the inverter module 11 and a power module 13 for driving the fan motor 6a.

The outdoor unit 3 further includes a linear electronic expansion valve drive unit 14 that drives the LEV 7, and a four-way valve drive unit 15 that drives the four-way valve 8. The LEV drive unit 14 and the four-way valve drive unit 15 are provided on the outdoor control board 10. The outdoor unit 3 further includes a control unit 16. The control unit 16 controls the inverter module 11, the power module 13, the LEV drive unit 14, and the four-way valve drive unit 15. The control unit 16 is provided on the outdoor control board 10. The control unit 16 is connected to the temperature detection unit 12.

The control unit 16 estimates the outside air temperature, which is the outside air temperature of the outdoor unit 3, based on the temperature detected by the temperature detection unit 12 while the compressor 5 is stopped. The control unit 16 may rotate the fan 6 in the direction opposite to the normal direction while the compressor 5 is stopped. The control unit 16 determines the rotation speed of the compressor 5 per unit time, the rotation speed of the fan 6 per unit time, and the LEV 7 based on the temperature detected by the temperature detection unit 12 or the estimated outside air temperature. Control the opening degree.

Specifically, the control unit 16 controls the inverter module 11 based on the temperature detected by the temperature detection unit 12 or the estimated outside air temperature to determine the number of revolutions per unit time of the compressor 5. Control. The control unit 16 controls the rotation speed of the fan 6 per unit time by controlling the power module 13 based on the temperature detected by the temperature detection unit 12 or the estimated outside air temperature. The control unit 16 controls the opening degree of the LEV 7 by controlling the LEV drive unit 14 based on the temperature detected by the temperature detection unit 12 or the estimated outside air temperature.

The outdoor unit 3 further has a storage unit 17 provided inside the control unit 16. An example of the storage unit 17 is a semiconductor memory. The storage unit 17 may be provided on the outdoor control board 10 other than the inside of the control unit 16. The control unit 16 identifies the temperature detected by the temperature detection unit 12 as the outside air temperature, and records data indicating the specified outside air temperature in the storage unit 17. Alternatively, the control unit 16 records data indicating the estimated outside air temperature in the storage unit 17. After recording the data in the storage unit 17, the control unit 16 per unit time of the compressor 5 based on the outside air temperature indicated by the data recorded in the storage unit 17 until the next time the outside air temperature is specified or estimated. The rotation speed of the fan 6, the rotation speed of the fan 6 per unit time, and the opening degree of the LEV 7 are controlled.

The outdoor unit 3 further includes a cooler 18 connected to the inverter module 11. The cooler 18 discharges the heat of the inverter module 11 to the outside of the outdoor control board 10 by using the wind generated by the rotation of the fan 6. The cooler 18 does not have to be connected to the inverter module 11. The power module 13 may be connected to the cooler 18. The power module 13 may be connected to a cooler other than the cooler 18. The cooler other than the cooler 18 is a cooler having the same function as the cooler 18.

Next, the operation of the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the first embodiment will be described. FIG. 3 is a flowchart showing the operation procedure of the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the first embodiment. FIG. 3 shows the operation of the control unit 16 when the compressor 5 is stopped. When the compressor 5 is stopped, it includes a case immediately before the start of the operation of the compressor 5 and a case immediately after the stop of the compressor 5.

The control unit 16 determines whether or not the fan 6 is rotating in the direction opposite to the normal direction (S1). When the fan 6 is rotating in the direction opposite to the normal direction, it means that the compressor 5 is operating normally, and the amount of current flowing through the compressor 5 is limited to an amount equal to or less than the target current amount. If not. The target current amount is a constant amount and is set in advance. When the control unit 16 determines that the fan 6 is rotating in the direction opposite to the normal direction (Yes in S1), the control unit 16 records data indicating the temperature detected by the temperature detection unit 12 in the storage unit 17 (yes in S1). S2).

The control unit 16 has a temperature detection control counter, which is not shown in FIG. 2, but is used when estimating the outside air temperature. After performing the operation of step S2, the control unit 16 determines whether or not the count time of the temperature detection control counter is longer than the predetermined estimated time (S3). The estimated time is the time required for the control unit 16 to estimate the outside air temperature in step S5 described later. An example of the estimated time is 1 minute. However, the estimated time is not limited to one minute. When the control unit 16 determines that the count time is longer than the estimated time (Yes in S3), the control unit 16 clears the count time of the temperature detection control counter (S4).

FIG. 4 is a diagram for explaining an operation when the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the first embodiment estimates the outside air temperature. FIG. 4 shows an example of how the temperature detected by the temperature detection unit 12 changes with the passage of time immediately after the operation of the compressor 5 is stopped. The temperature of the inverter module 11 immediately after the operation of the compressor 5 is stopped is relatively high. That is, the temperature detected by the temperature detection unit 12 immediately after the operation of the compressor 5 is stopped is relatively high.

The control unit 16 is based on the first characteristic that the temperature of the inverter module 11 decreases at a speed within a certain range and converges to the outside air temperature, and the temperature detected by the temperature detection unit 12 over an estimated time. It has a function of estimating the outside air temperature. After performing the operation of step S4, the control unit 16 calculates the temperature to converge based on the above-mentioned first characteristic and the temperature detected by the temperature detection unit 12 over the estimated time, and the temperature to converge. Is estimated as the outside air temperature (S5).

After performing the operation of step S5, the control unit 16 records data indicating the outside air temperature in the storage unit 17 (S6). When the control unit 16 knows that the time when the compressor 5 is stopped is longer than a predetermined time and the temperatures of the inverter module 11 and the cooler 18 are relatively close to the temperature outside the outdoor unit 3. The temperature detected by the temperature detection unit 12 may be regarded as the outside air temperature, and the data indicating the temperature detected by the temperature detection unit 12 may be recorded in the storage unit 17 as the data indicating the outside air temperature. That is, the outside air temperature indicated by the data recorded in the storage unit 17 is the outside air temperature estimated by the control unit 16 or the temperature detected by the temperature detection unit 12.

The control unit 16 stops the fan 6 after performing the operation of step S6 (S7). After performing the operation of step S7, the control unit 16 ends the operation related to recording the data indicating the outside air temperature in the storage unit 17.

When the control unit 16 determines that the fan 6 is not rotating in the direction opposite to the normal direction (No in S1), the control unit 16 rotates the fan 6 in the direction opposite to the normal direction (S8). If the fan 6 is not rotating in the direction opposite to the normal direction, it means that the fan 6 is stopped or the fan 6 is rotating in the normal direction.

As described above, in step S8, the control unit 16 rotates the fan 6 in the direction opposite to the normal direction. When the control unit 16 rotates the fan 6 in the direction opposite to the normal direction, the air outside the outdoor unit 3 can be positively applied to the cooler 18. As a result, the inverter module 11 is cooled. As a result, the estimated time when the control unit 16 estimates the outside air temperature after the operation of step S8 can be made shorter than the estimated time when the control unit 16 does not rotate the fan 6 in the direction opposite to the normal direction. ..

When the control unit 16 knows that the time when the compressor 5 is stopped is longer than a predetermined time and the temperatures of the inverter module 11 and the cooler 18 are relatively close to the outside air temperature of the outdoor unit 3. , It is not necessary to rotate the fan 6 in the direction opposite to the normal direction. The control unit 16 performs the operation of step S8 and then the operation of step S2.

When the control unit 16 determines that the count time is equal to or less than the estimated time (No in S3), the control unit 16 increments the count time of the temperature detection control counter (S9), and returns to step S1.

After performing the operation of step S7, the control unit 16 may return to step S1 and repeat the operations after step S1.

As described above, when the compressor 5 is stopped, when the control unit 16 determines that the fan 6 is not rotating in the direction opposite to the normal direction, the control unit 16 turns the fan 6 in the direction opposite to the normal direction. Rotate. As the fan 6 rotates in the direction opposite to the normal direction, the air having a temperature lower than the temperature of the inverter module 11 when the compressor 5 is operating hits the cooler 18. As a result, the inverter module 11 is cooled. As a result, the temperature detection unit 12 can detect the outside air temperature itself or a temperature close to the outside air temperature. As a result, the control unit 16 can estimate the outside air temperature.

After recording the data indicating the outside air temperature in the storage unit 17, the control unit 16 controls the compressor 5, the fan 6, the LEV 7, and the four-way valve 8 based on the request from the indoor unit 2 and the outside air temperature. The request from the indoor unit 2 means the request of the user.

As described above, the outdoor unit 3 included in the refrigeration cycle device 1 according to the first embodiment has a temperature detection unit 12 provided inside the inverter module 11. The control unit 16 having a function of estimating the outside air temperature is connected to the temperature detection unit 12. The inverter module 11 and the control unit 16 are provided on the outdoor control board 10.

Since the temperature detection unit 12 is provided inside the inverter module 11, the temperature detection unit 12 is provided even when vibration exceeding expectations occurs, for example, when the outdoor control board 10 is replaced in the market. 12 is protected. That is, the control unit 16 can acquire data indicating the temperature detected by the temperature detection unit 12. As a result, the outdoor unit 3 can detect or estimate the outside air temperature. That is, the refrigeration cycle device 1 can detect or estimate the outside air temperature even when vibration exceeding an assumption occurs or when the outdoor control board 10 is replaced.

As described above, the temperature detection unit 12 is provided inside the inverter module 11, and the inverter module 11 and the control unit 16 are provided on the outdoor control board 10. Therefore, the refrigeration cycle apparatus 1 according to the first embodiment is described in Patent Document 1 even when vibration exceeding an assumption occurs, for example, even when the outdoor control board 10 is replaced in the market. It does not cause the problem that the lead wire of the present invention is broken or the connector is disconnected.

FIG. 5 shows the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 included in the outdoor unit 3 of the refrigeration cycle device 1 according to the first embodiment. It is a figure which shows the processor 51 when a part or all functions of the above are realized by a processor 51. That is, some or all of the functions of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 execute the program stored in the memory 52. It may be realized by the processor 51.

The processor 51 is a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, or a DSP (Digital Signal Processor). The memory 52 is also shown in FIG.

When some or all of the functions of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 are realized by the processor 51, some or all of them. The function of is realized by the processor 51 and software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 52. The processor 51 reads and executes the program stored in the memory 52 to read and execute one of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16. Realize some or all functions.

That is, when a part or all of the functions of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 are realized by the processor 51, the refrigeration cycle device. 1 is that the step executed by a part or all of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 is executed as a result. It has a memory 52 for storing a program to become.

The program stored in the memory 52 is a procedure or method executed by a part or all of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16. It can be said that it is executed by a computer.

The memory 52 is, for example, non-volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EEPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). Alternatively, it may be a volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), or the like.

FIG. 6 shows the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 included in the outdoor unit 3 of the refrigeration cycle device 1 according to the first embodiment. It is a figure which shows the processing circuit 61 when a part or all of is realized by the processing circuit 61. That is, a part or all of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 may be realized by the processing circuit 61.

The processing circuit 61 is dedicated hardware. The processing circuit 61 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Is.

A part of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 may be dedicated hardware separate from the rest.

Regarding the plurality of functions of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16, some of the plurality of functions are realized by software or firmware. The rest of the plurality of functions may be realized by dedicated hardware. As described above, the plurality of functions of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 are hardware, software, firmware, or a combination thereof. Can be realized by.

Next, a usage example of the refrigeration cycle device 1 will be described. FIG. 7 is a diagram showing the configuration of the air conditioner 70 according to the first embodiment. As shown in FIG. 7, the air conditioner 70 includes the refrigeration cycle device 1 according to the first embodiment. FIG. 8 is a diagram showing the configuration of the hot water supply device 80 according to the first embodiment. As shown in FIG. 8, the hot water supply device 80 includes the refrigeration cycle device 1 according to the first embodiment. As described above, the refrigeration cycle device 1 is utilized by being provided in, for example, the air conditioner 70 or the hot water supply device 80.

Embodiment 2.
Next, the second embodiment will be described. The configuration of the refrigeration cycle device according to the second embodiment is the same as the configuration of the refrigeration cycle device 1 according to the first embodiment. The operation of the control unit 16 is different between the second embodiment and the first embodiment. In the first embodiment, the control unit 16 estimates the outside air temperature when the compressor 5 is stopped. In the second embodiment, the control unit 16 estimates the outside air temperature when the compressor 5 is operating. In the second embodiment, the parts different from the first embodiment will be mainly described.

When the compressor 5 is operating, the temperature detected by the temperature detection unit 12 is close to the temperature of the inverter module 11. Therefore, when the compressor 5 is operating, the control unit 16 cannot estimate the outside air temperature based on the first characteristic used in the first embodiment. In the second embodiment, as described later, the control unit 16 estimates the outside air temperature when the compressor 5 is operating by using the second characteristic.

The control unit 16 has a function not described in the first embodiment in addition to the function described in the first embodiment. Hereinafter, functions not described in the first embodiment of the control unit 16 will be described. When the operating time of the compressor 5 exceeds a predetermined first time, the control unit 16 controls to flow a constant current through the compressor 5 for a predetermined second time. After that, the control unit 16 rotates the fan 6 in the direction opposite to the normal direction for a predetermined third time, and the outside air temperature of the outdoor unit 3 is based on the temperature detected by the temperature detection unit 12. Estimate the outside air temperature.

The control unit 16 records data indicating the estimated outside air temperature in the storage unit 17, records the data in the storage unit 17, and then records the data recorded in the storage unit 17 until the next time the outside air temperature is specified or estimated. The rotation speed of the compressor 5 per unit time, the rotation speed of the fan 6 per unit time, and the opening degree of the LEV 7 are controlled based on the outside air temperature indicated by.

Next, an example of the operation of the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the second embodiment will be described. FIG. 9 is a flowchart showing an example of the operation procedure of the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the second embodiment. FIG. 9 shows the operation of the control unit 16 when the compressor 5 is operating.

The control unit 16 determines whether or not data indicating the outside air temperature is recorded in the storage unit 17 (S11). When the control unit 16 determines that the data indicating the outside air temperature is not recorded in the storage unit 17 (No in S11), the control unit 16 determines whether or not the amount of current flowing through the compressor 5 is limited (S12). .. When the amount of current flowing through the compressor 5 is not limited, it is the case where the compressor 5 is performing normal operation. For example, in step S12, when the amount of current flowing through the compressor 5 is the target current amount, the control unit 16 determines that the amount of current flowing through the compressor 5 is limited. When the amount of current flowing through the compressor 5 is larger than the target amount of current, the control unit 16 determines that the amount of current flowing through the compressor 5 is not limited. The target current amount is a constant amount and is set in advance.

When the control unit 16 determines that the amount of current flowing through the compressor 5 is limited (Yes in S12), the control unit 16 determines whether or not the fan 6 is rotating in the direction opposite to the normal direction (S13). ). When the control unit 16 determines that the fan 6 is rotating in the direction opposite to the normal direction (Yes in S13), the control unit 16 records data indicating the temperature detected by the temperature detection unit 12 in the storage unit 17 (yes in S13). S14). When the control unit 16 determines that the fan 6 is not rotating in the direction opposite to the normal direction (No in S13), the control unit 16 rotates the fan 6 in the direction opposite to the normal direction (S15). The control unit 16 performs the operation of step S15 and then the operation of step S14.

After performing the operation of step S14, the control unit 16 determines whether or not the count time of the temperature detection control counter is longer than the predetermined estimated time (S16). The estimated time is the time required for the control unit 16 to estimate the outside air temperature in step S18 described later. An example of the estimated time is 1 minute. However, the estimated time is not limited to one minute. When the control unit 16 determines that the count time is longer than the estimated time (Yes in S16), the control unit 16 clears the count time of the temperature detection control counter (S17).

FIG. 10 is a diagram for explaining the operation when the control unit 16 included in the outdoor unit 3 included in the refrigeration cycle device 1 according to the second embodiment estimates the outside air temperature. In FIG. 10, when the amount of current flowing through the compressor 5 is limited and the fan 6 is rotating in the direction opposite to the normal direction, the temperature detected by the temperature detection unit 12 is the passage of time. An example of how it changes with is shown.

The temperature of the inverter module 11 immediately after the amount of current flowing through the compressor 5 is limited and the fan 6 rotates in the direction opposite to the normal direction is relatively high. The control unit 16 has a second characteristic that the temperature of the inverter module 11 decreases at a speed within a certain range and converges to the convergence temperature T1, the temperature detected by the temperature detection unit 12 over the estimated time, and the convergence temperature. The outside air temperature T can be estimated based on the third characteristic that T1 is higher than the outside air temperature T and higher than the predetermined temperature ΔT.

The inverter module 11 includes a semiconductor switch. For example, the predetermined temperature ΔT is determined based on the amount of heat generated by the semiconductor switch of the inverter module 11. Furthermore, for example, the predetermined temperature ΔT is determined based on the target current amount flowing through the compressor 5. The predetermined temperature ΔT is predetermined, for example, experimentally or by calculation.

After performing the operation of step S17, the control unit 16 has the above-mentioned second characteristic, the temperature detected by the temperature detection unit 12 over the estimated time, and the temperature ΔT at which the convergence temperature T1 is predetermined from the outside air temperature T. The outside air temperature T is estimated based on the third characteristic of being higher (S18). Specifically, the control unit 16 calculates the convergence temperature T1 based on the above-mentioned second characteristic and the temperature detected by the temperature detection unit 12 over the estimated time, and is predetermined from the convergence temperature T1. The outside air temperature T is estimated by subtracting the temperature ΔT (S18).

After performing the operation of step S18, the control unit 16 records data indicating the outside air temperature in the storage unit 17 (S19). After performing the operation of step S19, the control unit 16 rotates the fan 6 in the normal direction (S20). After performing the operation in step S20, the control unit 16 causes the compressor 5 to perform a normal operation (S21). After performing the operation of step S21, the control unit 16 ends the operation related to recording the data indicating the outside air temperature in the storage unit 17.

When the control unit 16 determines that the amount of current flowing through the compressor 5 is not limited (No in S12), the control unit 16 limits the amount of current flowing through the compressor 5 (S22). For example, in step S22, the control unit 16 makes the amount of current flowing through the compressor 5 match the target current amount. When the amount of current flowing through the compressor 5 matches the target amount of current, the amount of heat generated by the inverter module 11 can be made constant. As a result, the control unit 16 can estimate the outside air temperature. After performing the operation of step S22, the control unit 16 performs the operation of step S11.

When the control unit 16 determines that the count time is equal to or less than the estimated time (No in S16), the control unit 16 increments the count time of the temperature detection control counter (S23). The control unit 16 performs the operation of step S23 and then the operation of step S11.

When the control unit 16 determines that the data indicating the outside air temperature is recorded in the storage unit 17 (Yes in S11), the control unit 16 determines whether or not the count time of the outside air temperature storage time counter is longer than 60 minutes (S24). ). Although not shown, the control unit 16 has an outside air temperature storage time counter. The outside air temperature storage time counter counts the elapsed time since the data indicating the outside air temperature was recorded in the storage unit 17. The above "60 minutes" is an example of the judgment criteria and may be changed.

When the control unit 16 determines that the count time of the outside air temperature storage time counter is longer than 60 minutes (Yes in S24), the control unit 16 clears the count time of the outside air temperature storage time counter (S25). After performing the operation of step S25, the control unit 16 clears the data indicating the outside air temperature recorded in the storage unit 17 (S26). The outside air temperature may change due to the influence of the weather. When the compressor 5 is operating, in the second embodiment, when the count time of the outside air temperature storage time counter is longer than 60 minutes, in step S26, the control unit 16 causes the outside air temperature recorded in the storage unit 17. Clear the data indicating. After performing the operation of step S26, the control unit 16 performs the operation of step S11.

When the control unit 16 determines that the count time of the outside air temperature storage time counter is 60 minutes or less (No in S24), the control unit 16 increments the count time of the outside air temperature storage time counter (S27). The control unit 16 performs the operation of step S27 and then the operation of step S11.

As described above, the control unit 16 of the second embodiment can estimate the outside air temperature when the compressor 5 is operating.

A part of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 of the outdoor unit 3 of the refrigeration cycle device 1 according to the second embodiment, or All the functions may be realized by a processor having the same function as the processor 51 of the first embodiment. In that case, the refrigeration cycle device 1 according to the second embodiment is one of the processor, the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16. It has a memory 52 for storing a program in which a step executed by a part or all is to be executed as a result. The memory is a memory having a function equivalent to that of the memory 52.

A part of the LEV 7, the inverter module 11, the temperature detection unit 12, the power module 13, the LEV drive unit 14, the four-way valve drive unit 15, and the control unit 16 of the outdoor unit 3 of the refrigeration cycle device 1 according to the second embodiment, or All may be realized by a processing circuit having the same function as the processing circuit 61 of the first embodiment.

The refrigeration cycle device 1 according to the second embodiment may also be provided in the air conditioner or the hot water supply device in the same manner as the refrigeration cycle device 1 according to the first embodiment.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 Refrigeration cycle device, 2 Indoor unit, 3 Outdoor unit, 4 Piping, 5 Compressor, 5a Compressor motor, 6 fan, 6a fan motor, 7 Linear electronic expansion valve, 8 Four-way valve, 9 Heat exchanger, 10 Outdoor control Board, 11 Inverter module, 12 Temperature detector, 13 Power module, 14 Linear electronic expansion valve drive, 15 Four-way valve drive, 16 Control, 17 Storage, 18 Cooler, 51 Processor, 52 Memory, 61 Processing circuit , 70 air conditioner, 80 hot water supply device.

Claims (6)

A compressor for compressing the refrigerant, a fan, Rise expansion valve that adjust the flow rate of the refrigerant, and a refrigeration cycle apparatus including the outdoor machine having the outdoor control board,
The compressor includes a compressor motor and includes a compressor motor.
The outdoor unit is
An inverter module provided on the outdoor control board and driving the compressor motor, and
A temperature detector provided inside the inverter module and
The outside air temperature, which is the outside air temperature of the outdoor unit, is estimated based on the temperature detected by the temperature detection unit while the compressor is stopped, which is provided on the outdoor control board, and is estimated by the temperature detection unit. based detected temperature or estimated the outside air temperature, the rotational speed per unit of compressor time, revolutions per the fan unit of time, and control for controlling the opening of the pre Ki膨expansion valve In addition possess a part,
The control unit is a refrigeration cycle device that rotates the fan in a direction opposite to the normal direction while the compressor is stopped. The outdoor unit further has a storage unit provided inside the control unit or on the outdoor control board.
The control unit identifies the temperature detected by the temperature detection unit as the outside air temperature and records data indicating the outside air temperature specified in the storage unit, or data indicating the estimated outside air temperature. Is recorded in the storage unit, and after the data is recorded in the storage unit, the compressor is based on the outside air temperature indicated by the data recorded in the storage unit until the next time the outside air temperature is specified or estimated. and number of revolutions per unit time, the rotational speed per unit of fans time, the refrigeration cycle apparatus according to claim 1 for controlling the opening of the front Ki膨expansion valve. When the operating time of the compressor exceeds a predetermined first time, the control unit controls to flow a constant current through the compressor for a predetermined second time. For a predetermined third time, the fan is rotated in the direction opposite to the normal direction, and the outside air temperature, which is the outside temperature of the outdoor unit, is estimated based on the temperature detected by the temperature detection unit. , Data indicating the estimated outside air temperature is recorded in the storage unit, and after recording the data in the storage unit, the data recorded in the storage unit is recorded until the next outside air temperature is specified or estimated. based on the outside air temperature indicated, the rotational speed per unit of compressor time, the rotational speed per unit of fans time, according to claim 2 for controlling the opening of the front Ki膨expansion valve Refrigeration cycle equipment. The outdoor unit further has a storage unit provided inside the control unit or on the outdoor control board.
When the operating time of the compressor exceeds a predetermined first time, the control unit controls to flow a constant current through the compressor for a predetermined second time. For a predetermined third time, the fan is rotated in the direction opposite to the normal direction, and the outside air temperature, which is the outside temperature of the outdoor unit, is estimated based on the temperature detected by the temperature detection unit. , Data indicating the estimated outside air temperature is recorded in the storage unit, and after recording the data in the storage unit, the data recorded in the storage unit is recorded until the next outside air temperature is specified or estimated. based on the outside air temperature indicated, the rotational speed per unit of compressor time, the rotational speed per unit of fans time, according to claim 1 for controlling the opening of the front Ki膨expansion valve Refrigeration cycle equipment. An air conditioner including the refrigeration cycle device according to any one of claims 1 to 4. A hot water supply device including the refrigeration cycle device according to any one of claims 1 to 4.

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