JP5804774B2 - Refrigeration cycle equipment - Google Patents

Description

  The present invention relates to a refrigeration cycle apparatus used for air conditioning of large facilities such as hospitals and hotels, and more particularly to a refrigeration cycle apparatus that reduces noise during operation.

  2. Description of the Related Art Conventionally, there are refrigeration cycle apparatuses that reduce operating noise (noise) emitted from an outdoor unit and an indoor unit when the room is air-conditioned. For example, when the sleep mode is selected, the rotational speed of the indoor fan motor and outdoor fan motor is decreased after a predetermined time, and in addition to this, the rotational speed of the compressor motor is decreased compared with that during normal operation to reduce the operation sound. (For example, refer to Patent Document 1).

JP-A-9-89347 (abstract, FIG. 5)

  However, in the technique described in Patent Document 1 described above, both the compressor motor and the fan motor are rotated at a low speed. Therefore, there is a problem that the cooling capacity as the refrigeration cycle apparatus is reduced and the efficiency is also reduced.

  The present invention has been made to solve the above-described problems, and even if noise is reduced, the reduction in air conditioning capability and efficiency can be minimized, and a time zone for noise reduction can be arbitrarily set. It aims at providing the refrigerating-cycle apparatus which can be set.

In the refrigeration cycle apparatus according to the present invention, at least a compressor, a first heat exchanger having a fan motor, an expansion valve, and a second heat exchanger are sequentially arranged in order to minimize a decrease in air conditioning capacity and efficiency. A refrigerant circuit that is connected by a refrigerant pipe and that exchanges heat between the refrigerant and water in the second heat exchanger, a time measuring means, and the frequency of the compressor are set according to the load, and the frequency of the fan motor is normally set. Mode A that is lower than during operation, mode B that suppresses the upper limit of the compressor frequency, mode B that makes the fan motor frequency the same as during normal operation, and the upper limit of the compressor frequency are suppressed, and the frequency of the fan motor the normally set in the mode C is each time lower than during operation, to determine the time based on counting of the timer means, set from the time to the time to the mode a, which of the mode B and mode C Select mode, in which a control means for reducing the noise compressor and fan motor rotation speed was controlled based on the selected mode, generated from the compressor and the fan motor.

According to the present invention, the frequency of the compressor is set according to the load, the mode A in which the frequency of the fan motor is lower than that during normal operation, the upper limit value of the compressor frequency is suppressed, and the frequency of the fan motor is normally operated. Mode B, which is the same as the time, and Mode C, which suppresses the upper limit of the compressor frequency and lowers the fan motor frequency compared to normal operation, are set at each time, and the time is determined based on the time measured by the time measuring means. Then, any one of mode A, mode B and mode C set at that time is selected from that time, and the rotation speeds of the compressor and the fan motor are controlled based on the selected mode , respectively. In addition, the noise generated from the fan motor is reduced. Thereby, noise reduction can be aimed at, suppressing the fall of the air-conditioning capability and efficiency as a refrigerating-cycle apparatus to the minimum.

Schematic of a refrigeration cycle apparatus showing an embodiment. The diagram which shows the change of the unit noise value with respect to the unit capacity | capacitance of the refrigerating-cycle apparatus in embodiment. The diagram which shows the unit noise value with respect to the unit capacity | capacitance of the refrigeration cycle apparatus in embodiment, and the change of unit efficiency. The flowchart which shows the operation | movement in the mode A of the refrigerating-cycle apparatus which concerns on embodiment. 5 is a flowchart showing an operation in mode B following FIG. 4. 6 is a flowchart showing an operation in mode C following FIG. 5. The figure of the schedule which shows the correlation for the time for noise reduction in embodiment, and each mode.

Embodiment.
1 is a schematic diagram of a refrigeration cycle apparatus showing an embodiment, FIG. 2 is a diagram showing a change in unit noise value with respect to a unit capacity of the refrigeration cycle apparatus in the embodiment, and FIG. 3 is a diagram of the refrigeration cycle apparatus in the embodiment. It is a diagram which shows the unit noise value with respect to unit capacity, and the change of unit efficiency.

  The refrigeration cycle apparatus shown in FIG. 1 is composed of, for example, an air-cooled heat pump chiller used for air conditioning of large facilities such as hotels and hospitals, and a condenser 2 (first heat exchanger) having a compressor 1 and an outdoor fan motor 3. , An expansion valve 4, an evaporator 5 (second heat exchanger) and the like are sequentially connected to the refrigerant pipe 6, a refrigerant circuit, a control circuit 11, a compressor drive circuit 12, and an outdoor fan motor drive circuit. 13, an operation unit 14, and a timer 15 which is a time measuring unit are housed in one unit.

  During operation of the refrigeration cycle apparatus, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 enters the condenser 2 and is cooled by the outdoor fan motor 3 to become a low-temperature and high-pressure liquid refrigerant. Next, the liquid refrigerant is decompressed by the expansion valve 4 to become a low-temperature and low-pressure liquid refrigerant and flows into the evaporator 5. The liquid refrigerant flowing into the evaporator 5 exchanges heat with the high-temperature water in the water pipe 7 to become a low-pressure gas refrigerant and flows into the compressor 1. On the other hand, the high-temperature water in the water pipe 7 that has flowed into the evaporator 5 absorbs heat from the low-temperature and low-pressure liquid refrigerant to become low-temperature water, and flows into an indoor unit (not shown). The low-temperature water that has flowed into the indoor unit is heat-exchanged with indoor air to become high-temperature water and flows into the evaporator 5.

  When the operation mode to be described later is not set, the control circuit 11 performs the compressor drive circuit 12 and the outdoor fan motor so that the room temperature becomes the set temperature set by the operation of the operation unit 14 as normal operation. The rotational speed (capacity) of the compressor 1 and the outdoor fan motor 3 is controlled via the drive circuit 13 to control the opening degree of the expansion valve 4.

  As will be described later, the control circuit 11 sets each frequency of the compressor 1 and the outdoor fan motor 3 in combination with emphasis on either improvement of the capacity and efficiency of the refrigerant circuit, and counts the time of the timer 15. The time is determined based on the time, the frequencies of the compressor 1 and the outdoor fan motor 3 are selected from the time, and the rotation speeds of the compressor 1 and the outdoor fan motor 3 are controlled based on the selected frequency, respectively. 1 and a control means for reducing noise generated from the outdoor fan motor 3 is provided.

Here, the unit capacity based on the number of revolutions of the compressor 1 and the outdoor fan motor 3 in the unit of the refrigeration cycle apparatus, the unit noise value emitted from the unit, and the efficiency of the refrigeration cycle apparatus (hereinafter referred to as “unit efficiency”) The correlation will be described with reference to FIGS.
As shown in FIG. 2, the unit noise value increases as the unit capacity increases. Further, as shown in FIG. 3, when the unit capacity is reduced, the unit noise value is lowered, and accordingly, the unit efficiency is also lowered. Conversely, when the unit capacity is increased, the unit efficiency gradually increases and decreases when it exceeds MAX, while the unit noise value increases in proportion to the unit capacity.

  Therefore, in the present embodiment, the following modes are set in the control circuit 11 in order to reduce the noise value generated from the unit during operation of the refrigeration cycle apparatus. For example, the control circuit 11 sets the frequency of the compressor 1 according to the load (set temperature) (no upper limit value) and sets the frequency of the outdoor fan motor 3 to be lower than that during normal operation, and the compressor 1 The upper limit of the frequency is suppressed, the mode B in which the frequency of the outdoor fan motor 3 is the same as that during normal operation, and the upper limit of the frequency of the compressor 1 is suppressed, and the frequency of the outdoor fan motor 3 is lower than that during normal operation. Mode C to be set is set.

  To suppress the upper limit value of the frequency of the compressor 1 is to make the frequency lower than the frequency when the compressor 1 is operated at the rated capacity. Making the frequency of the outdoor fan motor 3 lower than that during normal operation means making the frequency lower than the frequency of the outdoor fan motor 3 during normal operation.

  For example, when a mode for noise reduction is input at each time by the operation unit 14, the control circuit 11 creates a schedule in which the mode is associated with each time as shown in FIG. ). The schedule and the timer 15 constitute a schedule timer. The setting of the mode for each time shown in FIG. 7 is an example and is not limited. When it is determined that the time has changed from the time measured by the timer 15, the control circuit 11 controls the compressor drive circuit 12 and the outdoor fan motor drive circuit 13 based on the mode set at that time.

  In mode A, since the noise is reduced by lowering the frequency of the outdoor fan motor 3 and the upper limit value of the frequency of the compressor 1 is not lowered, the cooling capacity is not lowered. In mode B, since the upper limit value of the frequency of the compressor 1 is suppressed, the power consumption is reduced, and the noise is reduced without reducing the COP. In mode C, by reducing the upper limit value of the frequency of the compressor 1 and further reducing the frequency of the outdoor fan motor 3, both the cooling capacity and the COP are reduced, but the noise is reduced most.

  The compressor driving circuit 12 and the outdoor fan motor driving circuit 13 have a rectifying unit that converts an AC voltage from the AC power supply 16 into a DC voltage, and an inverter unit that converts the DC voltage output from the rectifying unit into an AC voltage. ing. The compressor drive circuit 12 determines the frequency of the compressor 1 based on an instruction from the control circuit 11, and drives the inverter unit so that the compressor 1 rotates at the determined frequency. As described above, the outdoor fan motor drive circuit 13 determines the frequency of the outdoor fan motor 3 based on an instruction from the control circuit 11, and drives the inverter unit so that the outdoor fan motor 3 rotates at the determined frequency. To do.

Next, the operation of the refrigeration cycle apparatus of the present embodiment will be described based on the flowcharts shown in FIGS. 4 to 6 and the schedule shown in FIG.
4 is a flowchart showing an operation in mode A of the refrigeration cycle apparatus according to the embodiment, FIG. 5 is a flowchart showing an operation in mode B following FIG. 4, and FIG. 6 is a flowchart showing an operation in mode C following FIG. is there.
It is assumed that the schedule of FIG. 7 set by the operation of the operation unit 14 is set in the control circuit 11.

  When a signal for starting operation by the operation of the operation unit 14 is input (S1), the control circuit 11 determines the current time from the time measured by the timer 15, and determines whether or not the mode A is set at that time. (S2). When it is determined that the mode B is set at that time, the control circuit 11 proceeds to S7, and when it is determined that the mode C is set at that time, the control circuit 11 proceeds to S12. When it is determined that A is set, an instruction to set the frequency of the compressor 1 according to the load (set temperature) is output to the compressor drive circuit 12 (S3). Next, the control circuit 11 outputs an instruction to set the frequency of the outdoor fan motor 3 to a frequency lower than that during normal operation to the outdoor fan motor drive circuit 13 (S4). Thereafter, the control circuit 11 determines whether or not the mode A is set with respect to the time measured by the timer 15 (S5). When the mode A is set, the process returns to S3 until the mode A ends. Repeat the operation.

  On the other hand, when the compressor drive circuit 12 receives the above-described instruction, the inverter drive unit 12 is configured so that the compressor 1 rotates within a range not exceeding the rated capacity of the compressor 1 and according to the load (set temperature). Drive. The outdoor fan motor drive circuit 13 determines the frequency of the outdoor fan motor 3 based on an instruction from the control circuit 11, and drives the inverter unit so that the outdoor fan motor 3 rotates at the determined frequency. In this case, since the noise is reduced by lowering the frequency of the outdoor fan motor 3 and the upper limit value of the frequency of the compressor 1 is not lowered, the cooling capacity is not lowered.

  When it is determined in S5 that the mode A has ended, the control circuit 11 determines whether either mode B or C is set at the time measured by the timer 15 (10 o'clock) (S6). When it is determined that the mode C is set at that time, the control circuit 11 proceeds to S13. However, when it is determined that the mode B is set at that time (10 o'clock), the control circuit 11 limits the frequency of the compressor 1 to an upper limit. An instruction to set a value is output to the compressor drive circuit 12 (S8). Next, the control circuit 11 outputs to the outdoor fan motor drive circuit 13 an instruction similar to that during normal operation of the frequency of the fan motor 3 (S9). Thereafter, the control circuit 11 determines whether or not the mode B is set at the time measured by the timer 15 (S10). When the mode B is set, the control circuit 11 returns to S8 and operates until the mode B ends. repeat.

  On the other hand, when the compressor drive circuit 12 receives the above-described instruction, the compressor drive circuit 12 is connected to an inverter so that the compressor 1 rotates within a capacity range lower than the rated capacity of the compressor 1 and according to a load (set temperature). Drive part. The outdoor fan motor drive circuit 13 drives the inverter unit according to the instruction from the control circuit 11 so that the outdoor fan motor 3 rotates at the same frequency as during normal operation. In this case, since the upper limit value of the frequency of the compressor 1 is suppressed, the power consumption is reduced as compared with the mode A, and the noise can be further reduced without reducing the COP.

  When it is determined in S10 that the mode B has ended, the control circuit 11 determines whether either mode A or C is set at the time measured by the timer 15 (17:00) (S11). When it is determined that the mode C is set at that time, the control circuit 11 proceeds to S13. However, when it is determined that the mode A is set at that time (17:00), the control circuit 11 returns to S3 and described above. Repeat the operation. Also in this case, as described above, the noise is reduced by reducing the frequency of the outdoor fan motor 3, and the upper limit value of the frequency of the compressor 1 is not lowered, so that the cooling capacity is not lowered. .

  When it is determined in S5 that the mode A has ended, the control circuit 11 determines whether either mode B or C is set at the time measured by the timer 15 (22:00) (S6). The control circuit 11 proceeds to S8 when it is determined that the mode B is set at that time, but when it is determined that the mode C is set at that time (22:00), the control circuit 11 of the compressor 1 is determined at S13. An instruction to set an upper limit value for the frequency is output to the compressor drive circuit 12. Next, the control circuit 11 outputs an instruction to set the frequency of the outdoor fan motor 3 to a frequency lower than that during normal operation to the outdoor fan motor drive circuit 13 (S14). Thereafter, the control circuit 11 determines whether or not the mode C is set at the time measured by the timer 15 (S15). When the mode C is set, the control circuit 11 returns to S13 and operates until the mode C ends. repeat.

  On the other hand, when the compressor drive circuit 12 receives the above-described instruction, the compressor drive circuit 12 is connected to an inverter so that the compressor 1 rotates within a capacity range lower than the rated capacity of the compressor 1 and according to a load (set temperature). Drive part. The outdoor fan motor drive circuit 13 drives the inverter unit so that the outdoor fan motor 3 rotates at a frequency lower than that during normal operation in accordance with an instruction from the control circuit 11. In this case, by lowering the upper limit value of the frequency of the compressor 1 and further lowering the frequency of the outdoor fan motor 3, both the cooling capacity and the COP are lowered, but the noise is reduced most.

As described above, in the present embodiment, the mode A in which the frequency of the compressor 1 is set according to the load (set temperature) (no upper limit value), and the frequency of the outdoor fan motor 3 is lower than that during normal operation, The upper limit of the frequency of the compressor 1 is suppressed, the mode B in which the frequency of the outdoor fan motor 3 is the same as that during normal operation, and the upper limit of the frequency of the compressor 1 is suppressed, and the frequency of the outdoor fan motor 3 is normally set. The compressor and the outdoor fan motor are controlled at every time arbitrarily set by the user using Mode C, which is lower than that during operation. For this reason, noise reduction can be aimed at, suppressing the fall of the cooling capacity and efficiency as a refrigerating-cycle apparatus to the minimum.
In addition, since modes A, B, and C can be arbitrarily set for each time, it is possible to realize an operation for noise reduction according to the user's needs.

  In addition, mode A, B, and C can be set arbitrarily at each time, so if cooling capacity is not required, such as during night driving, select mode B, and cooling capacity is required during daytime driving, When it is desired to suppress the noise level, the mode A is selected, and the three modes can be rearranged according to the user's needs.

  In the embodiment, the schedule timer is configured using the schedule and the timer 15, but a hardware configuration schedule timer may be connected to the control circuit 11.

  In the embodiment, the refrigeration cycle apparatus having only the cooling operation has been described. However, the present invention is not limited to this, and a refrigeration cycle apparatus in which a four-way valve is provided in the refrigerant circuit and heating operation can be used.

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Condenser, 3 Outdoor fan motor, 4 Expansion valve, 5 Evaporator, 6 Refrigerant pipe, 7 Water pipe, 11 Control circuit, 12 Compressor drive circuit, 13 Outdoor fan motor drive circuit, 14 Operation part, 15 Timer, 16 AC power supply.

Claims (2)

At least a compressor, a first heat exchanger having a fan motor, an expansion valve, and a second heat exchanger are sequentially connected by a refrigerant pipe, and heat is exchanged between the refrigerant and water in the second heat exchanger. A refrigerant circuit to
Timekeeping means,
The frequency of the compressor is set according to the load, the mode A in which the frequency of the fan motor is set lower than that during normal operation, the upper limit value of the frequency of the compressor is suppressed, and the frequency of the fan motor is set during normal operation. Mode B to be the same and mode C to suppress the upper limit value of the frequency of the compressor and lower the frequency of the fan motor than during normal operation are set for each time, and the time is set based on the time of the time measuring means. The mode is selected, and the mode A, the mode B, and the mode C set at the time is selected from that time, and the rotation speeds of the compressor and the fan motor are determined based on the selected mode. A refrigeration cycle apparatus comprising control means for controlling and reducing noise generated from the compressor and the fan motor, respectively. The refrigeration cycle apparatus according to claim 1, wherein the control means includes a schedule timer capable of setting the mode A, the mode B, and the mode C for each time.

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