WO2018229864A1

WO2018229864A1 - Air conditioning device

Info

Publication number: WO2018229864A1
Application number: PCT/JP2017/021800
Authority: WO
Inventors: 圭吾岡島; 昌彦中川
Original assignee: 三菱電機株式会社
Priority date: 2017-06-13
Filing date: 2017-06-13
Publication date: 2018-12-20
Also published as: JP6755396B2; JPWO2018229864A1; CN110709648A; CN110709648B

Abstract

This air conditioning device comprises: a primary circuit in which a compressor, a condenser, a limiting device, an evaporator, and an accumulator are sequentially connected, and in which a zeotropic mixture refrigerant containing a first refrigerant and a second refrigerant having a higher boiling point than the first refrigerant circulates; and a control device that controls the primary circuit. The primary circuit has a first regulating valve provided upstream of the accumulator, a second regulating valve provided downstream of the accumulator, and a bypass pipe that bypasses the accumulator. The control device adjusts the proportion of the first refrigerant in the zeotropic mixture refrigerant taken into the compressor by controlling the first regulating valve and the second regulating valve.

Description

Air conditioner

This invention relates to an air conditioner using a non-azeotropic refrigerant mixture.

Conventionally, an air conditioner having a refrigerant circuit in which a compressor, a condenser, an expansion valve, an evaporator, and an accumulator are sequentially connected by piping (for example, see Patent Document 1). When performing the dehumidifying operation, the air conditioner of Patent Document 1 increases the temperature of the air cooled by the evaporator with a condenser that acts as a reheater, and suppresses the temperature drop of the air blown into the room. Yes.

By the way, the refrigerant circulating in the refrigerant circuit includes a single refrigerant and a mixed refrigerant. In the mixed refrigerant, an azeotropic mixed refrigerant in which refrigerants having the same boiling point are mixed with a refrigerant having different boiling points is mixed. There is an azeotropic refrigerant mixture. The non-azeotropic refrigerant mixture includes a low boiling point refrigerant having a relatively low boiling point and a high boiling point refrigerant having a relatively high boiling point.

JP 2007-78242 A

However, when a non-azeotropic refrigerant mixture is simply applied to a conventional air conditioner such as Patent Document 1, a low-boiling refrigerant and a low-boiling refrigerant are mixed together in the non-azeotropic refrigerant mixture. Compared with the case where a single refrigerant is applied, the discharge temperature is less likely to rise. That is, the conventional air conditioner has a problem that it cannot perform an efficient operation utilizing the characteristics of the non-azeotropic refrigerant mixture.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an air conditioner that realizes an efficient operation utilizing the characteristics of a non-azeotropic refrigerant mixture.

The air conditioner according to the present invention includes a compressor, a condenser, a throttling device, an evaporator, and an accumulator, which are sequentially connected and include a first refrigerant and a second refrigerant having a boiling point higher than that of the first refrigerant. A main circuit through which the refrigerant circulates, and a control device that controls the main circuit, the main circuit including a first adjustment valve provided upstream of the accumulator and a second adjustment provided downstream of the accumulator A bypass pipe for connecting the valve, between the evaporator and the first regulating valve, between the second regulating valve and the compressor, and bypassing the accumulator, and the control device includes the first regulating valve And the second adjusting valve are respectively controlled to adjust the ratio of the first refrigerant in the non-azeotropic refrigerant mixture sucked into the compressor.

According to the air conditioning apparatus of the present invention, the ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor is adjusted by controlling the first regulating valve and the second regulating valve, respectively. Since the pressure can be increased and the high pressure and the temperature of the refrigerant discharged from the compressor can be increased, efficient operation utilizing the characteristics of the non-azeotropic refrigerant mixture can be realized.

It is the figure which showed the structure relevant to the refrigerant circuit of the air conditioning harmony system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the control system of the air conditioning apparatus of FIG. It is a flowchart which shows the operation | movement centering on the dehumidification operation and defrost operation of the air conditioning apparatus of FIG. It is a flowchart which shows the operation | movement in the heating amount up mode of the air conditioning apparatus of FIG. It is the figure which showed the structure relevant to the refrigerant circuit of the air conditioning harmony system which concerns on Embodiment 2 of this invention. It is a block diagram which shows the control system of the air conditioning apparatus of FIG. It is a flowchart which shows the operation | movement centering on the dehumidification driving | operation of the air conditioning apparatus of FIG. It is a flowchart which shows the operation | movement in the heating amount up mode of the air conditioning apparatus of FIG.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration related to the refrigerant circuit of the air-conditioning conditioning system according to Embodiment 1 of the present invention. As shown in FIG. 1, the air conditioning system 100 includes an air conditioning apparatus 200 and a controller 300. In the first embodiment, the air conditioner 200 is a dehumidifier installed in a room such as a room. The air conditioner 200 may be an industrial dehumidifier or a dehumidifier installed in a general household.

The air conditioner 200 includes a compressor 1, a condenser 2, an expansion device 3, an evaporator 4, an accumulator (ACC) 6, a hot gas electromagnetic valve 7, a first electromagnetic valve 8, and a second electromagnetic valve 9. Yes. The first electromagnetic valve 8 is provided on the upstream side of the accumulator 6, that is, between the evaporator 4 and the accumulator 6. The second electromagnetic valve 9 is provided on the downstream side of the accumulator 6, that is, between the accumulator 6 and the compressor 1.

In the air conditioner 200, the compressor 1, the condenser 2, the expansion device 3, the evaporator 4, the first electromagnetic valve 8, the accumulator 6, and the second electromagnetic valve 9 are sequentially connected by the main pipe 20, and the refrigerant circulates. A main circuit 10 is included. The main pipe 20 includes a discharge pipe 21 arranged on the high pressure side, a liquid pipe 22 arranged on the high pressure side, a liquid pipe 23 arranged on the low pressure side, and a suction pipe arranged on the low pressure side. 24.

The discharge pipe 21 is a pipe connecting the discharge side of the compressor 1 and the inflow side of the condenser 2. High-pressure refrigerant discharged from the compressor 1 flows through the discharge pipe 21. The liquid pipe 22 is a pipe that connects the outflow side of the condenser 2 and the inflow side of the expansion device 3. A high-pressure liquid refrigerant flowing out of the condenser 2 flows through the liquid pipe 22. The liquid pipe 23 is a pipe connecting the outflow side of the expansion device 3 and the inflow side of the evaporator 4. The low-pressure two-phase refrigerant that has flowed out of the expansion device 3 flows through the liquid pipe 23. The suction pipe 24 is a pipe connecting the outflow side of the evaporator 4 and the suction side of the compressor 1. The low-pressure gas refrigerant collected from the evaporator 4 flows through the suction pipe 24.

The suction pipe 24 has a bypass pipe 24 a that connects between the evaporator 4 and the first electromagnetic valve 8, between the second electromagnetic valve 9 and the compressor 1, and bypasses the accumulator 6. More specifically, the intake pipe 24 is provided with upstream branching means 24b upstream of the first electromagnetic valve 8, that is, between the evaporator 4 and the first electromagnetic valve 8. The intake pipe 24 is provided with a downstream branching unit 24 c downstream of the second electromagnetic valve 9, that is, between the second electromagnetic valve 9 and the compressor 1. That is, the upstream branching unit 24b and the downstream branching unit 24c are connected by the bypass pipe 24a.

The air conditioner 200 has a hot gas bypass circuit 15 that connects between the discharge side of the compressor 1 and the condenser 2 and between the condenser 2 and the expansion device 3. The hot gas bypass circuit 15 includes a hot gas defrost pipe 25 and a hot gas solenoid valve 7. More specifically, the first branching means 25 a is provided in the middle of the discharge pipe 21, and the second branching means 25 b is provided in the middle of the liquid pipe 22. That is, the first branching means 25 a and the second branching means 25 b are connected by the hot gas defrost pipe 25, and the hot gas electromagnetic valve 7 is disposed in the hot gas defrost pipe 25.

The air conditioner 200 of the first embodiment uses a first refrigerant and a second refrigerant having a higher boiling point than the first refrigerant as refrigerant that circulates through the refrigerant circuit formed by the main circuit 10 and the hot gas bypass circuit 15. A non-azeotropic refrigerant mixture is used. In the non-azeotropic refrigerant mixture, the first refrigerant is a low-boiling refrigerant having a relatively low boiling point, and the second refrigerant is a high-boiling refrigerant having a relatively high boiling point.

More specifically, the non-azeotropic mixed refrigerant is, for example, R407C or R448A. The non-azeotropic refrigerant mixture is a refrigerant mixture of R32, R125, R134a, R1234yf, and CO _2, and the condition that the ratio XR32 (wt%) of R32 is “33 <XR32 <39”; The ratio XR125 (wt%) of “27 <XR125 <33”, the ratio XR134a (wt%) of R134a is “11 <XR134a <17”, and the ratio XR1234yf (wt%) of R1234yf is The condition that “11 <XR1234yf <17”, the condition that the CO ₂ ratio XCO ₂ (wt%) is “3 <XCO ₂ <9”, and the sum of XR32, XR125, XR134a, XR1234yf, and XCO ₂ are A refrigerant that satisfies all the conditions of 100 may be used.

The compressor 1 compresses the refrigerant. The compressor 1 may be a constant speed compressor or an inverter compressor provided with a motor driven by an inverter. The condenser 2 condenses the refrigerant compressed in the compressor 1. The condenser 2 is composed of, for example, a fin-and-tube heat exchanger, and exchanges heat between the refrigerant and air. The expansion device 3 is composed of, for example, an electronic expansion valve, and expands the refrigerant condensed in the condenser 2. The evaporator 4 evaporates the refrigerant expanded in the expansion device 3. The evaporator 4 consists of a fin and tube type heat exchanger, for example, and heat-exchanges between a refrigerant | coolant and air.

By the way, when the refrigerant that has not been evaporated by the evaporator 4 is sucked into the compressor 1 in a liquid state, the compressor 1 causes liquid compression. That is, when the liquid refrigerant is sucked into the compressor 1, since the liquid is incompressible, a large pressure is generated inside the compressor 1, and a severe impact sound is generated. Further, since the liquid refrigerant dissolves in the oil in the compressor 1, the concentration of the oil is diluted and the viscosity of the oil is lowered, so that the compressor 1 may break down due to poor lubrication. In order to prevent such inconvenience, the accumulator 6 is provided in the main circuit 10 of the air conditioner 200. Whether or not the liquid refrigerant has returned to the compressor 1 can be determined based on the value of the suction superheat degree (hereinafter referred to as suction SH). As will be described in detail later, the suction SH can be obtained by subtracting the low-pressure saturation temperature from the suction temperature measured by the suction pipe temperature sensor 33.

The accumulator 6 is for separating the refrigerant flowing into the container into gas and liquid and returning the gas refrigerant to the compressor 1. The hot gas solenoid valve 7 is an electromagnetic valve that is in an open state that allows the refrigerant to pass therethrough when in the ON state, and that is in a closed state that blocks the refrigerant when in the OFF state. If the hot gas solenoid valve 7 is in the ON state, the refrigerant discharged from the compressor 1 passes through the hot gas bypass circuit 15.

The first electromagnetic valve 8 and the second electromagnetic valve 9 are electromagnetic valves that are in an open state in which the refrigerant is allowed to pass in the ON state and are in a closed state in which the refrigerant is shut off in the OFF state. When the first electromagnetic valve 8 and the second electromagnetic valve 9 are in the ON state, the refrigerant that has passed through the evaporator 4 passes through the accumulator 6. The first electromagnetic valve 8 corresponds to the “first regulating valve” of the present invention, and the second electromagnetic valve 9 corresponds to the “second regulating valve” of the present invention.

Further, the air conditioner 200 has a fan 5 shared by the evaporator 4 and the condenser 2. The fan 5 can send wind to the evaporator 4 and can also send wind to the condenser 2. That is, the fan 5 acts to promote the evaporation of the refrigerant in the evaporator 4, that is, the release of cold heat, and to promote the condensation of the refrigerant in the condenser 2, that is, the release of hot heat.

Furthermore, the air conditioning apparatus 200 includes a discharge pipe temperature sensor 31, a high pressure sensor 32, a suction pipe temperature sensor 33, and a low pressure sensor 34. The discharge pipe temperature sensor 31 is provided around the discharge port of the compressor 1 and measures a discharge temperature that is the temperature of the refrigerant discharged from the compressor 1. The high pressure sensor 32 is provided around the discharge port of the compressor 1 and measures a high pressure that is the pressure of the refrigerant discharged from the compressor 1. The suction pipe temperature sensor 33 is provided in the vicinity of the suction port of the compressor 1 and measures a suction temperature that is the temperature of the refrigerant sucked into the compressor 1. The low-pressure sensor 34 is provided around the suction port of the compressor 1 and measures a low-pressure that is the pressure of the refrigerant sucked into the compressor 1.

And the air conditioner 200 has the control apparatus 50 which controls the main circuit 10, the hot gas bypass circuit 15, and the fan 5. FIG. That is, the control device 50 controls operations of various actuators in the air conditioner 200 such as the compressor 1, the expansion device 3, the hot gas electromagnetic valve 7, the first electromagnetic valve 8, the second electromagnetic valve 9, and the fan 5. And manage. For example, the control device 50 adjusts the ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor 1 by adjusting the open / close states of the first electromagnetic valve 8 and the second electromagnetic valve 9. It is. Hereinafter, the ratio of the first refrigerant in the non-azeotropic refrigerant mixture sucked into the compressor 1 is also simply referred to as “the ratio of the first refrigerant”.

(Basic refrigerant flow)
Next, the basic refrigerant flow in the refrigerant circuit of the air conditioner 200 will be described.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the discharge pipe 21 and enters the condenser 2. The gas refrigerant that has entered the condenser 2 is liquefied by releasing warm heat by exchanging heat with air. The refrigerant liquefied in the condenser 2 flows into the expansion device 3 through the liquid pipe 22 and is decompressed in the expansion device 3 to be in a gas-liquid two-phase state. Then, the refrigerant that has become a gas-liquid two-phase state in the expansion device 3 flows into the evaporator 4 through the liquid pipe 23, and heat is exchanged with air in the evaporator 4, thereby releasing cold. Gasify. Further, the refrigerant gasified by the evaporator 4 passes through the suction pipe 24 and is sucked from the suction side of the compressor 1 and compressed again. That is, in the air conditioning apparatus 200, the refrigerant in the refrigerant circuit repeats the circulation process as described above, thereby forming a refrigeration cycle.

By the way, in the air conditioner 200, as indicated by the dashed-dotted white arrow in FIG. 1, the indoor air sucked from the room passes through the evaporator 4 and then passes through the condenser 2. . Therefore, the indoor air is cooled when passing through the evaporator 4 and is heated when passing through the condenser 2. In other words, the room air receives cold heat when passing through the evaporator 4 and falls below the dew point. Therefore, a part of the room air is condensed on the evaporator 4 to be cooled and dehumidified. On the other hand, when the room air that has passed through the evaporator 4 passes through the condenser 2, it receives warm heat and reaches a predetermined temperature, and is discharged into the room as air having a low relative humidity. That is, in the air conditioner 200, the condenser 2 functions as a reheater that adds warm heat again to the cooled air when passing through the evaporator 4.

FIG. 2 is a block diagram showing a control system of the air conditioner of FIG. With reference to FIG. 2, the configuration content of the control device 50 will be specifically described. As illustrated in FIG. 2, the control device 50 includes a control unit 51, an operation unit 52, and a storage unit 53. The operation unit 52 receives an input operation related to various settings such as a target temperature and a target pressure, and outputs a signal corresponding to the content of the input operation to the control unit 51. The storage unit 53 includes a RAM (Random Access Memory) for storing various data, and a ROM (Read Only Memory) for storing a program for the control unit 51 to perform control in each operation mode. Has been.

The control unit 51 is configured by, for example, a CPU (Central Processing Unit), a microcomputer, or a DSP (Digital Signal Processor). The control unit 51 includes information on the discharge temperature measured by the discharge pipe temperature sensor 31, information on the high pressure measured by the high pressure sensor 32, information on the suction temperature measured by the suction pipe temperature sensor 33, and a low pressure sensor. Information on the low pressure measured by 34 is input.

The control unit 51 causes the air conditioner 200 to perform a dehumidifying operation, an operation in the heating amount up mode, and a defrosting operation. The control unit 51 controls the operation of various actuators in the air conditioning apparatus 200 based on information output from various sensors, a signal output from the operation unit 52, a signal transmitted from the controller 300, and the like. It is.

For example, the control unit 51 appropriately controls the open / closed state of the first electromagnetic valve 8 and the second electromagnetic valve 9 according to the program in the ROM of the storage unit 53 and adjusts the composition of the refrigerant to be sucked into the compressor 1. is there. That is, the control unit 51 performs opening / closing control of the first electromagnetic valve 8 and the second electromagnetic valve 9, and adjusts the amount of liquid refrigerant remaining in the accumulator 6, thereby controlling the refrigerant composition in the refrigerant circuit, that is, the refrigerant circuit. The ratio of the circulating low-boiling refrigerant is changed.

The controller 51 can increase the ratio of the first refrigerant by opening the first electromagnetic valve 8 and the second electromagnetic valve 9. When the ratio of the first refrigerant increases, the value of the low pressure measured by the low pressure sensor 34 increases, the amount of refrigerant circulating in the refrigerant circuit increases, the value of the high pressure measured by the high pressure sensor 32, and the discharge The discharge temperature value measured by the tube temperature sensor 31 increases. Therefore, since the temperature difference between the temperature of the evaporator 4 and the temperature of the refrigerant flowing into the evaporator 4 becomes large, the defrosting time in the defrosting operation can be shortened and the dehumidification efficiency can be increased. The dehumidifying efficiency in the first embodiment is determined by using a value obtained by dividing the dehumidifying operation time by the defrosting time (dehumidifying operating time / defrosting time) as an index.

The controller 300 is connected to the control device 50 in a wired or wireless manner, and communicates with the control unit 51. The controller 300 is provided with an ON switch for starting the operation of the air conditioner 200, an OFF switch for stopping the operation of the air conditioner 200, a heating amount adjustment switch for increasing the heating amount, and the like. Yes. The controller 300 receives an input operation by a user and transmits a signal corresponding to the content of the input operation to the control unit 51.

(During dehumidifying operation)
The controller 51 determines whether the first solenoid valve 8 and the second solenoid valve 9 are open or closed during the dehumidifying operation by checking whether the suction SH is higher or lower than the first threshold value. More specifically, the control unit 51 obtains the suction SH by subtracting the low pressure saturation temperature from the suction temperature input from the suction pipe temperature sensor 33. The low pressure saturation temperature is a value obtained by converting the value of the low pressure input from the low pressure sensor 34 into a saturation temperature. The storage unit 53 stores, for example, a conversion table that is table information in which the low pressure and the saturation temperature are associated with each other, and the control unit 51 checks the low pressure information input from the low pressure sensor 34 against the conversion table. Thus, the low pressure saturation temperature is obtained. Then, the control unit 51 determines whether or not the obtained suction SH is equal to or smaller than the first threshold value. If the suction SH is equal to or smaller than the first threshold value, the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened. It is a state.

When the first solenoid valve 8 and the second solenoid valve 9 are in the open state, the ratio of the first refrigerant sucked into the compressor 1 increases and the discharge temperature rises. Therefore, the temperature of the condenser 2 and the condenser 2 are increased. The temperature difference from the temperature of the entering refrigerant increases. Therefore, when it is going to obtain the same heat exchange amount with the condenser 2, if the compressor 1 is an inverter compressor which can adjust a frequency with an inverter, compared with the time when the compressor 1 is a constant speed compressor. Since the operating frequency can be lowered, the driving efficiency can be improved. That is, according to the air conditioner 200 in which an inverter compressor is mounted as the compressor 1, it is possible to increase COP (Coefficient of Performance).

More specifically, when the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened, the control unit 51 performs a COP-up operation that lowers the frequency of the compressor 1, that is, the operation frequency of the motor of the compressor 1. It may be. For example, the control unit 51 compresses when the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened, or when the waiting time has elapsed since the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened. The frequency of the machine 1 may be lowered. The waiting time may be set and changed via the operation unit 52 or the controller 300, or the control unit 51 may automatically set the waiting time according to the operating state or the installation environment. However, the control unit 51 may increase the frequency of the compressor 1 when the first electromagnetic valve 8 and the second electromagnetic valve 9 are closed. Such a COP-up operation and the like can be performed by the control unit 51 during the defrosting operation and the operation in the heating amount increase mode.

Further, the controller 51 obtains the intake SH over time even after the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened, and determines whether or not the obtained intake SH is greater than or equal to the second threshold value. It is. The control unit 51 closes the first electromagnetic valve 8 and the second electromagnetic valve 9 when the suction SH reaches the second threshold value.

Here, the first threshold value is a temperature serving as a reference for opening the first electromagnetic valve 8 and the second electromagnetic valve 9 during the dehumidifying operation, and is set to 5K, for example. The second threshold is a temperature that serves as a reference for closing the first electromagnetic valve 8 and the second electromagnetic valve 9 that are once opened during the dehumidifying operation. The second threshold is set to a temperature higher than the first threshold, for example, 15K. The first threshold value and the second threshold value can be appropriately changed according to the configuration content of the air conditioner 200 and the installation environment. The user can set and change the first threshold value and the second threshold value by operating the operation unit 52 or the controller 300.

(During operation in heating up mode)
The user can perform a setting operation of the heating amount up mode for increasing the heating amount by the condenser 2 via the operation unit 52 or the controller 300. In the heating amount up mode, the controller 51 performs the opening / closing control of the first electromagnetic valve 8 and the second electromagnetic valve 9 according to the change of the discharge temperature measured by the discharge pipe temperature sensor 31, thereby increasing the heating capacity. This is an operation mode that adjusts to realize a rapid dehumidifying operation. Here, the rapid dehumidifying operation is an operation that provides an air environment having a desired humidity in a time earlier than a normal dehumidifying operation by supplying air having a low relative humidity into the room.

In the setting operation of the heating amount up mode, in addition to the operation for instructing the start of the heating amount up mode, the operation for setting the time for starting the heating amount up mode or the time until the heating amount up mode is started is set. Operations are included. Further, the setting operation of the heating amount up mode includes an operation of setting the heating amount up continuation time, which is the time during which the control unit 51 continues the control in the heating amount up mode. That is, the user can set and change the heating amount increase duration by operating the operation unit 52 or the controller 300.

In the heating amount up mode, the controller 51 first opens the first electromagnetic valve 8 and the second electromagnetic valve 9 during the operation of the compressor 1. More specifically, the control unit 51 detects the start of the heating amount up mode according to a signal from the operation unit 52 or the controller 300 or a setting content in the operation unit 52 or the controller 300. When the control unit 51 detects the start of the heating amount up mode while the compressor 1 is operating, the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9. Further, when the control unit 51 detects the start of the heating amount up mode, if the compressor 1 is stopped, the control unit 51 waits until the compressor 1 starts operation, and when the compressor 1 starts operation. The first electromagnetic valve 8 and the second electromagnetic valve 9 are opened.

When the first solenoid valve 8 and the second solenoid valve 9 are opened, the composition of the non-azeotropic refrigerant mixture in the refrigerant circuit changes, and the ratio of the first refrigerant circulating in the refrigerant circuit increases. That is, the controller 51 can increase the ratio of the first refrigerant by opening the first electromagnetic valve 8 and the second electromagnetic valve 9. When the ratio of the first refrigerant circulating in the refrigerant circuit increases, the low pressure increases, the amount of refrigerant circulating in the refrigerant circuit increases, and the high pressure and discharge temperature increase. The control unit 51 causes the first electromagnetic valve 8 and the second electromagnetic valve 9 to maintain an open state until the discharge temperature input from the discharge pipe temperature sensor 31 reaches a closing threshold set to 120 ° C., for example.

After the first solenoid valve 8 and the second solenoid valve 9 are opened, the control unit 51 sets the first solenoid valve 8 and the discharge valve temperature when the discharge temperature input from the discharge pipe temperature sensor 31 rises to the closing threshold. The second electromagnetic valve 9 is closed. Furthermore, after the control unit 51 closes the first electromagnetic valve 8 and the second electromagnetic valve 9, the discharge temperature input from the discharge pipe temperature sensor 31 is reduced to an open threshold that is set to 110 ° C., for example. Until this is done, the first electromagnetic valve 8 and the second electromagnetic valve 9 are kept in the closed state. And the control part 51 makes the 1st solenoid valve 8 and the 2nd solenoid valve 9 an open state, when the discharge temperature input from the discharge pipe temperature sensor 31 falls to an open threshold value.

Here, the closing threshold is a temperature that serves as a reference timing for closing the first solenoid valve 8 and the second solenoid valve 9 during operation in the heating-up mode. The closing threshold may be set to a temperature higher than the closing reference threshold. The open threshold is a temperature that serves as a reference for reopening the first electromagnetic valve 8 and the second electromagnetic valve 9 once closed during operation in the heating amount increase mode, and is set to a temperature lower than the close threshold. The open threshold value may be set to a temperature lower than the closed reference temperature and higher than the open reference temperature. The closing threshold and the opening threshold can be appropriately changed according to the configuration content of the air conditioner 200 and the installation environment. The user can set and change the open threshold value and the close threshold value by operating the operation unit 52 or the controller 300.

In addition, the control unit 51 has a heating amount up timer (not shown) that measures an elapsed time since the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened. That is, the control part 51 starts time-measurement by the heating amount up timer when the first electromagnetic valve 8 and the second electromagnetic valve 9 are opened. When the heating amount up timer counts up, that is, when the heating amount up time elapses after the first electromagnetic valve 8 and the second electromagnetic valve 9 are initially opened, The quantity up mode is terminated, and the normal operation is started. In the first embodiment, the normal operation corresponds to a normal dehumidifying operation.

(Defrost operation: Hot gas defrost)
The control unit 51 determines whether or not the air conditioner 200 is in the defrosting operation based on the open / closed state of the hot gas solenoid valve 7. During the defrosting operation, the hot gas solenoid valve 7 is in an open state. That is, if the hot gas solenoid valve 7 is in the open state, the control unit 51 determines that the defrosting operation is being performed, and if the hot gas solenoid valve 7 is in the closed state, it is not in the defrosting operation. It comes to judge. In the first embodiment, the control unit 51 determines that the dehumidifying operation is being performed if the hot gas solenoid valve 7 is in a closed state.

When the control unit 51 determines that the air conditioner 200 is in the defrosting operation, the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 and sets the non-azeotropic refrigerant mixture to be sucked into the compressor 1. The ratio of the first refrigerant is increased by changing the composition. In addition, the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 and then opens the first electromagnetic valve when the discharge temperature input from the discharge pipe temperature sensor 31 reaches the closed reference threshold. The valve 8 and the second electromagnetic valve 9 are once closed to suppress an increase in discharge temperature. Furthermore, after the first electromagnetic valve 8 and the second electromagnetic valve 9 are closed, the control unit 51 sets the first electromagnetic valve when the discharge temperature input from the discharge pipe temperature sensor 31 falls to the open reference threshold. The valve 8 and the second electromagnetic valve 9 are opened again.

Here, the closing reference threshold is a temperature serving as a reference for closing the first electromagnetic valve 8 and the second electromagnetic valve 9 during the defrosting operation, and is set to 115 ° C., for example. The open reference threshold is a temperature that serves as a reference for the timing of reopening the first electromagnetic valve 8 and the second electromagnetic valve 9 that are once closed during the defrosting operation. The open reference threshold is set to a temperature lower than the closed reference threshold, and is set to 105 ° C., for example. The open reference threshold value and the closed reference threshold value can be appropriately changed according to the configuration content of the air conditioner 200, the installation environment, and the like. The user can set and change the open reference threshold and the closed reference threshold by operating the operation unit 52 or the controller 300.

The control unit 51 has a function of determining whether or not the defrosting operation end condition is satisfied, and ends the defrosting operation when the defrosting operation end condition is satisfied. For example, the controller 51 may be configured to start the defrosting operation by estimating that the evaporator 4 is in a frosting state when the dehumidifying operation is continuously performed for a predetermined set time. In the case of adopting such a configuration, for example, a temperature sensor such as a thermistor is provided at the air suction port of the air conditioner 200, and the control unit 51 determines the set time for the dehumidifying operation based on the measured temperature of the temperature sensor You may make it determine the defrost time which is the time which continues a frost driving | operation. Then, the control unit 51 may start timing when the defrosting operation is started, and end the defrosting operation when the defrosting time has elapsed. In this case, when the defrosting time has elapsed, the defrosting operation end condition is satisfied.

Also, the control unit 51 may determine the start and end timing of the defrosting operation according to the temperature of the evaporator 4. In the case of adopting such a configuration, for example, an evaporation temperature sensor composed of a thermistor or the like may be provided in the evaporator 4. And the control part 51 starts defrost operation, when the temperature measured in the evaporation temperature sensor falls to the start threshold value, and then defrosts when the temperature measured in the evaporation temperature sensor rises to the end threshold value. You may make it complete | finish a driving | operation. In this case, when the temperature measured by the evaporation temperature sensor rises to the end threshold value, the defrosting operation end condition is satisfied. Note that the end threshold is set to a temperature higher than the start threshold.

(Method for controlling opening and closing of the first regulating valve 11 and the second regulating valve 12)
FIG. 3 is a flowchart showing operations centering on dehumidifying operation and defrosting operation of the air-conditioning apparatus of FIG. 1. FIG. 4 is a flowchart showing the operation in the heating amount up mode of the air conditioner of FIG. Based on FIG.3 and FIG.4, the opening / closing control method of the 1st solenoid valve 8 and the 2nd solenoid valve 9 is demonstrated. First, with reference to FIG. 3, the operation control method centering on the dehumidification operation and defrost operation of an air conditioning apparatus is demonstrated.

The control unit 51 determines whether or not the compressor 1 is in operation (step S101). If the compressor 1 is not in operation, the control unit 51 waits until the compressor 1 starts operation (step S101 / NO). ). When the control unit 51 detects the start of the heating amount up mode during the operation of the compressor 1 (step S101 / YES) (step S102 / YES), the control unit 51 shifts to the heating amount up mode (see FIG. 4). When the control unit 51 is not operating the compressor 1 (step S101 / YES) and does not detect the start of the heating-up mode (step S102 / NO), is the air conditioning apparatus 200 performing the defrosting operation? It is determined whether or not (step S103).

(Defrosting operation)
When the control unit 51 detects that the hot gas solenoid valve 7 is open and determines that the air-conditioning apparatus 200 is in the defrosting operation (step S103 / YES), the control unit 51 and the first solenoid valve 8 2 The ratio of the first refrigerant is increased by opening the solenoid valve 9 (step S104).

Next, the control unit 51 determines whether or not the discharge temperature input from the discharge pipe temperature sensor 31 is equal to or higher than the closed reference threshold (step S105). If the discharge temperature is lower than the closing reference threshold (step S105 / NO), the controller 51 determines whether or not the defrosting operation end condition is satisfied (step S106). Control part 51 will return to processing of Step S102, if defrost operation end conditions are fulfilled (Step S106 / YES). If the defrosting operation end condition is not satisfied (step S106 / NO), the control unit 51 returns to the process of step S105.

On the other hand, when the discharge temperature reaches the closing reference threshold (step S105 / YES), the control unit 51 closes the first electromagnetic valve 8 and the second electromagnetic valve 9 to suppress an increase in the discharge temperature (step S107). . And the control part 51 determines whether the discharge temperature input from the discharge pipe temperature sensor 31 is below an open reference threshold value (step S108).

When the discharge temperature is higher than the open reference threshold, the control unit 51 causes the first electromagnetic valve 8 and the second electromagnetic valve 9 to maintain a closed state (step S108 / NO). However, after the first solenoid valve 8 and the second solenoid valve 9 are closed in step S107, the control unit 51 sets the defrosting operation end condition until the discharge temperature falls to the open reference threshold (step S108 / NO). If satisfied, the process returns to step S102.

The control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 (step S109) when the discharge temperature falls to the open reference threshold (step S108 / YES). Next, the control unit 51 determines whether or not the defrosting operation end condition is satisfied (step S110). If the defrosting operation end condition is satisfied (step S110 / YES), the control unit 51 returns to the process of step S102. If the defrosting operation end condition is not satisfied (step S110 / NO), the control unit 51 returns to the process of step S105.

(Dehumidifying operation)
When the control unit 51 detects that the hot gas solenoid valve 7 is closed and determines that the air-conditioning apparatus 200 is in the dehumidifying operation (step S103 / NO), the control unit 51 obtains the intake SH and obtains the obtained intake. It is determined whether or not SH is equal to or less than a first threshold value (step S201).

When the intake SH is a value higher than the first threshold value (step S201 / NO), it is considered that the compressor 1 does not cause liquid compression, so the control unit 51 applies the first electromagnetic valve 8 and the second electromagnetic valve 9 to each other. The process returns to step S102 while the closed state is maintained. On the other hand, if the intake SH is equal to or less than the first threshold (step S201 / YES), the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 (step S202).

Further, the control unit 51 obtains the inhalation SH over time, and determines whether or not the obtained inhalation SH is equal to or greater than the second threshold (step S203). The control unit 51 causes the first electromagnetic valve 8 and the second electromagnetic valve 9 to maintain the open state until the obtained suction SH reaches the second threshold value (step S203 / NO). And when the suction | inhalation SH reaches | attains 2nd threshold value (step S203 / YES), the control part 51 closes the 1st solenoid valve 8 and the 2nd solenoid valve 9 (step S204), and returns to the process of step S102.

Next, the operation control method in the heating amount up mode of the air conditioner will be described with reference to FIG. When detecting the start of the heating-up mode in step S102 of FIG. 3 (step S102 / YES), the controller 51 determines whether or not the compressor 1 is in operation (step S301). Then, if the compressor 1 is not in operation, the control unit 51 waits until the compressor 1 starts operation (step S301 / NO).

When the compressor 1 is in operation or when the compressor 1 starts operation (step S301 / YES), the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 to generate refrigerant. To increase the ratio of the first refrigerant. In that case, the control part 51 starts time-measurement by a heating amount up timer (step S302).

Next, the control unit 51 determines whether or not the discharge temperature input from the discharge pipe temperature sensor 31 is equal to or higher than the closing threshold (step S303). If the discharge temperature is lower than the closing threshold, the controller 51 causes the first electromagnetic valve 8 and the second electromagnetic valve 9 to maintain the open state (step S303 / NO). On the other hand, when the discharge temperature rises to the open threshold (step S303 / YES), the controller 51 determines whether or not the heating amount up timer has counted up (step S304).

When the heating amount up timer counts up (step S304 / YES), the control unit 51 ends the heating amount up mode (step S305) and shifts to normal operation. On the other hand, if the heating amount up timer does not count up (step S304 / NO), the controller 51 closes the first electromagnetic valve 8 and the second electromagnetic valve 9 (step S306).

And if the heating amount up timer counts up (step S307 / YES), the control part 51 will complete | finish a heating amount up mode (step S308), and will transfer to a normal driving | operation. On the other hand, if the heating amount up timer does not count up (step S307 / NO), the control unit 51 determines whether or not the discharge temperature input from the discharge pipe temperature sensor 31 is equal to or lower than the open threshold. Determination is made (step S309).

If the discharge temperature is higher than the open threshold (step S309 / NO), the controller 51 causes the first electromagnetic valve 8 and the second electromagnetic valve 9 to maintain the closed state, and returns to the process of step S307. On the other hand, when the discharge temperature falls to the opening threshold value (step S309 / YES), the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 (step S310), and returns to the process of step S303.

As described above, according to the air conditioner 200, the ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor 1 is controlled by controlling the first electromagnetic valve 8 and the second electromagnetic valve 9, respectively. adjust. Therefore, the low pressure can be raised and the high pressure and the temperature of the refrigerant discharged from the compressor 1 can be raised, so that an efficient operation utilizing the characteristics of the non-azeotropic refrigerant mixture can be realized. it can.

By the way, since the conventional air conditioning apparatus applies a non-azeotropic refrigerant mixture, the discharge temperature is less likely to rise than when a low-boiling point single refrigerant is applied. There is a problem that the amount of heat to perform is insufficient and it takes time to complete the defrosting. In this regard, the air-conditioning apparatus 200 according to the first embodiment increases the ratio of the first refrigerant that is a low boiling point refrigerant by opening the first electromagnetic valve 8 and the second electromagnetic valve 9 during the defrosting operation. Can do. Therefore, the temperature difference between the temperature of the evaporator 4 and the temperature of the refrigerant that circulates in the refrigerant circuit and enters the evaporator 4 becomes large, so that the defrosting time can be shortened. And since the ratio of the defrosting time with respect to a dehumidification driving | operation time can be reduced, the improvement of a defrosting efficiency can be aimed at.

Further, in the heating amount up mode, the control unit 51 performs opening / closing control of the first electromagnetic valve 8 and the second electromagnetic valve 9 based on the discharge temperature measured by the discharge pipe temperature sensor 31. Thereby, since the control part 51 can adjust the heat exchange amount of the condenser 2 which acts as a reheater, it can implement | achieve a rapid dehumidification driving | operation. In addition, when the air conditioning apparatus 200 is equipped with an inverter compressor as the compressor 1, the control unit 51 can perform the COP-up operation, so that the operation efficiency can be increased. In addition, when a DC fan is mounted as the fan 5 during the COP-up operation, the COP can be further improved by adjusting the air volume.

Further, the control unit 51 opens the first electromagnetic valve 8 and the second electromagnetic valve 9, and then when the discharge temperature, which is the temperature of the refrigerant discharged from the compressor, reaches the closed reference threshold, Since the valve 8 and the second electromagnetic valve 9 are closed, an excessive increase in the discharge temperature can be suppressed. Moreover, since the 1st solenoid valve 8 and the 2nd solenoid valve 9 are solenoid valves which have an open state and a closed state, respectively, the air conditioning apparatus 200 improves the efficiency of air conditioning control by simple control. Can be achieved.

That is, the air conditioner 200 opens the first electromagnetic valve 8 and the second electromagnetic valve 9 at a predetermined timing, and increases the ratio of the low-boiling-point refrigerant circulating in the refrigerant circuit, thereby increasing the low-pressure pressure, and the refrigerant circuit The refrigerant circulation amount is increased, and the discharge temperature and the high pressure are increased. Therefore, it is possible to shorten the defrosting time, increase the defrosting efficiency, and improve the operation efficiency.

Embodiment 2. FIG.
FIG. 5 is a diagram showing a configuration related to the refrigerant circuit of the air conditioning harmony system according to Embodiment 2 of the present invention. As shown in FIG. 5, the configuration of the air conditioning system 100A of the second embodiment is the same as that of the air conditioning system 100 of the first embodiment described above, but the configuration of the refrigerant circuit is different. That is, the main circuit 10 of the air conditioner 200 A is characterized in that it has a first adjustment valve 11 and a second adjustment valve 12 instead of the first electromagnetic valve 8 and the second electromagnetic valve 9. The same reference numerals are used for the same components as those in the first embodiment, and the description thereof will be omitted. In the following, configurations and operations particularly related to the control of the first adjustment valve 11 and the second adjustment valve 12 will be described.

As shown in FIG. 5, the air conditioning system 100A includes an air conditioning apparatus 200A and a controller 300. In the air conditioner 200 A, the first adjustment valve 11 and the second adjustment valve 12 are provided in the suction pipe 24 of the main circuit 10. The first regulating valve 11 is provided on the upstream side of the accumulator 6, that is, between the evaporator 4 and the accumulator 6. The second adjustment valve 12 is provided on the downstream side of the accumulator 6, that is, between the accumulator 6 and the compressor 1. Each of the first adjustment valve 11 and the second adjustment valve 12 includes, for example, an electronic expansion valve, and the opening degree can be adjusted.

The bypass pipe 24a of the second embodiment connects between the evaporator 4 and the first regulating valve 11 and between the second regulating valve 12 and the compressor 1. That is, in the suction pipe 24 of the second embodiment, the upstream branching means 24b is provided upstream of the first regulating valve 11, and the downstream branching means 24c is provided downstream of the second regulating valve 12.

FIG. 6 is a block diagram showing a control system of the air conditioner of FIG. As shown in FIG. 6, the control device 50 A includes a control unit 51 A, and the control unit 51 A adjusts the respective opening degrees of the first adjustment valve 11 and the second adjustment valve 12. That is, the control unit 51A determines the first adjustment valve 11 and the second adjustment valve 12 based on information output from various sensors, a signal output from the operation unit 52, a signal transmitted from the controller 300, and the like. It is comprised so that each opening may be adjusted.

During the dehumidifying operation, the control unit 51A determines the respective opening degrees of the first regulating valve 11 and the second regulating valve 12 according to the change of the suction SH. That is, if the intake SH is equal to or less than the first threshold value, the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction to open the first adjustment valve 11 and the second adjustment valve 12. Increase the degree.

When the opening degree of the first regulating valve 11 and the second regulating valve 12 is increased, the ratio of the first refrigerant sucked into the compressor 1 is increased and the discharge temperature is increased, so that the temperature of the condenser 2 and the condenser 2 are increased. The temperature difference from the temperature of the entering refrigerant increases. Therefore, when trying to obtain the same heat exchange amount in the condenser 2, if the compressor 1 is an inverter compressor, the operating frequency can be lowered as compared with the case where the compressor 1 is a constant speed compressor. Driving efficiency can be improved.

Further, the control unit 51A obtains the intake SH over time even after increasing the opening degree of the first adjustment valve 11 and the second adjustment valve 12, and determines whether the obtained intake SH is equal to or greater than the second threshold value. It comes to judge. Then, when the intake SH reaches the second threshold value, the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the closing direction so that the first adjustment valve 11 and the second adjustment valve 12 The opening is made smaller.

In the second embodiment, the first threshold value is a temperature serving as a reference for the timing of operating the first regulating valve 11 and the second regulating valve 12 in the opening direction during the dehumidifying operation, and is set to 5K, for example. In addition, the second threshold value is a temperature that serves as a reference for timing of operating the first adjustment valve 11 and the second adjustment valve 12 once operated in the opening direction during the dehumidifying operation. The second threshold is set to a temperature higher than the first threshold, for example, 15K. The first threshold value and the second threshold value can be appropriately changed according to the configuration content of the air conditioner 200A, the installation environment, and the like. The user can set and change the first threshold value and the second threshold value by operating the operation unit 52 or the controller 300.

In the heating amount increase mode, the control unit 51A first operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction during the operation of the compressor 1, and the first adjustment valve 11 and the second adjustment valve 12 are operated. The degree of opening is increased. Then, the control unit 51A sets the current opening degree to the first adjustment valve 11 and the second adjustment valve 12 until the discharge temperature input from the discharge pipe temperature sensor 31 reaches a closing threshold set to 120 ° C., for example. Let it be maintained.

Further, the control unit 51A increases the opening degree of the first adjustment valve 11 and the second adjustment valve 12, and then the first adjustment valve when the discharge temperature input from the discharge pipe temperature sensor 31 rises to the closing threshold. 11 and the second regulating valve 12 are operated in the closing direction. Furthermore, after the control unit 51A reduces the opening degree of the first adjustment valve 11 and the second adjustment valve 12, the discharge temperature input from the discharge pipe temperature sensor 31 decreases to an open threshold value set to 110 ° C., for example. Until it does, the 1st regulating valve 11 and the 2nd regulating valve 12 maintain the present opening degree. And the control part 51 makes the 1st solenoid valve 8 and the 2nd solenoid valve 9 the open state, when the discharge temperature input from the discharge pipe temperature sensor 31 falls to an open threshold value.

Here, the closing threshold is a temperature that serves as a reference for timing to reduce the opening degree of the first regulating valve 11 and the second regulating valve 12 during operation in the heating amount up mode. The closing threshold may be set to a temperature higher than the closing reference threshold. The open threshold is a temperature that serves as a reference for the timing of increasing the opening degree of the first and

second regulating valves

11 and 12 once reduced during operation in the heating amount increase mode, and is set to a temperature lower than the closing threshold. Is done. The open threshold value may be set to a temperature lower than the closed reference temperature and higher than the open reference temperature. The closing threshold and the opening threshold can be appropriately changed according to the configuration content of the air conditioner 200A, the installation environment, and the like. The user can set and change the open threshold value and the close threshold value by operating the operation unit 52 or the controller 300.

During the defrosting operation, the control unit 51A first operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction so that the opening degrees of the first adjustment valve 11 and the second adjustment valve 12 are increased. It has become. As a result, the control unit 51A changes the composition of the non-azeotropic refrigerant mixture that is sucked into the compressor 1 and increases the ratio of the first refrigerant.

Further, the control unit 51A increases the opening degree of the first adjustment valve 11 and the second adjustment valve 12, and then performs the first adjustment when the discharge temperature input from the discharge pipe temperature sensor 31 reaches the closed reference threshold value. The valve 11 and the second regulating valve 12 are operated in the closing direction to suppress an increase in discharge temperature. Further, the control unit 51A reduces the opening degree of the first adjustment valve 11 and the second adjustment valve 12, and then performs the first adjustment when the discharge temperature input from the discharge pipe temperature sensor 31 falls to the open reference threshold. The opening degree of the valve 11 and the second regulating valve 12 is increased.

Here, the closing reference threshold is a temperature that serves as a reference for timing to reduce the opening degree of the first adjusting valve 11 and the second adjusting valve 12 during the defrosting operation, and is set to 115 ° C., for example. The open reference threshold is a temperature that serves as a reference for timing of increasing the opening degree of the first adjustment valve 11 and the second adjustment valve 12 once reduced during the defrosting operation. The open reference threshold is set to a temperature lower than the closed reference threshold, and is set to 105 ° C., for example. The closing reference threshold and the opening reference threshold can be appropriately changed according to the configuration content of the air conditioner 200A, the installation environment, and the like. The user can set and change the open reference threshold and the closed reference threshold by operating the operation unit 52 or the controller 300. Other functions of the control unit 51A are the same as those of the control unit 51 of the first embodiment.

(Method of opening degree adjustment control of the first solenoid valve 8 and the second solenoid valve 9)
FIG. 7 is a flowchart showing operations centering on the dehumidifying operation and the defrosting operation of the air-conditioning apparatus of FIG. FIG. 8 is a flowchart showing the operation in the heating amount up mode of the air conditioner of FIG. Based on FIG.7 and FIG.8, the method of the opening degree adjustment control of the 1st regulating valve 11 and the 2nd regulating valve 12 is demonstrated.

First, with reference to FIG. 7, the operation control method centering on the dehumidifying operation and the defrosting operation of the air conditioner will be described. About the operation | movement equivalent to FIG. 3, description is abbreviate | omitted using the same code | symbol.

The control unit 51A executes the processing from step S101 to step S103 in the same manner as in the case of FIG. When the control unit 51A detects that the hot gas solenoid valve 7 is open and determines that the air-conditioning apparatus 200 is in the defrosting operation (step S103 / YES), the first adjustment valve 11 Then, the second adjustment valve 12 is operated in the opening direction (step S401).

Next, the control unit 51A executes the processing from step S105 to step S106 as in the case of FIG. When the discharge temperature input from the discharge pipe temperature sensor 31 reaches the close reference threshold (step S105 / YES), the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the closing direction. (Step S402). Subsequently, the control unit 51A executes the process of step S108 in the same manner as in FIG. 3, and when the discharge temperature input from the discharge pipe temperature sensor 31 has dropped to the open reference threshold (step S108 / YES). The first adjustment valve 11 and the second adjustment valve 12 are operated in the opening direction (step S403).

Further, when the control unit 51A detects that the hot gas solenoid valve 7 is in the closed state and determines that the air conditioning apparatus 200 is in the dehumidifying operation (step S103 / NO), the process of step S201 is performed. The same processing as in the case of 3 is performed. If the intake SH is equal to or less than the first threshold value (step S201 / YES), the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction (step S501), and illustrates the process of step S203. The same processing as in the case of 3 is performed. Then, when the intake SH reaches the second threshold value, the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the closing direction (step S502), and returns to the process of step S102.

Next, the operation control method in the heating amount up mode of the air conditioner will be described with reference to FIG. About the operation | movement equivalent to FIG. 4, description is abbreviate | omitted using the same code | symbol.

When the controller 51A detects the start of the heating-up mode in step S102 of FIG. 3 (step S102 / YES), it determines whether or not the compressor 1 is in operation (step S301). When the compressor 1 is in operation or when the compressor 1 starts operation (step S301 / YES), the control unit 51 operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction. Increase the ratio of the first refrigerant. At that time, the control unit 51A starts measuring time by the heating amount up timer (step S601).

Next, the control unit 51A executes the processing from step S303 to step S305 as in the case of FIG. Then, the control unit 51A determines that the discharge temperature input from the discharge pipe temperature sensor 31 is equal to or higher than the closing threshold (step S303 / YES) and the heating amount up timer has not counted up (step S304 / NO). The first adjustment valve 11 and the second adjustment valve 12 are operated in the closing direction (step S602).

Next, the control unit 51A executes the processing from step S307 to step S309 as in the case of FIG. Then, the control unit 51A operates the first adjustment valve 11 and the second adjustment valve 12 in the opening direction when the discharge temperature input from the discharge pipe temperature sensor 31 falls to the open threshold (NO in step S309). (Step S603), the process returns to Step S303.

By the way, in the above description, the case where the controller 51A causes the first adjustment valve 11 and the second adjustment valve 12 to maintain the current opening until the discharge temperature reaches the closing threshold is illustrated, but the present invention is limited to this. It is not a thing. For example, the control unit 51A may finely adjust the opening degrees of the first adjustment valve 11 and the second adjustment valve 12 in accordance with information output from various sensors. In the above description, the control unit 51A illustrated the case where the first adjustment valve 11 and the second adjustment valve 12 maintain the current opening until the discharge temperature falls to the open threshold, but the present invention is not limited thereto. It is not something. For example, the control unit 51A may finely adjust the opening degrees of the first adjustment valve 11 and the second adjustment valve 12 in accordance with information output from various sensors. In this way, the ratio of the first refrigerant in the non-azeotropic refrigerant mixture that circulates in the refrigerant circuit can be adjusted more flexibly.

As described above, according to the air conditioner 200A, the ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor 1 is controlled by controlling the first regulating valve 11 and the second regulating valve 12, respectively. adjust. Therefore, the low pressure can be raised, and the high pressure and the temperature of the refrigerant discharged from the compressor can be raised, so that an efficient operation utilizing the characteristics of the non-azeotropic refrigerant mixture can be realized. . Moreover, since the 1st adjustment valve 11 and the 2nd adjustment valve 12 are electronic expansion valves which can respectively adjust an opening degree, the ratio of a 1st refrigerant | coolant can be adjusted more flexibly.

That is, the air conditioner 200A increases the opening of the first regulating valve 11 and the opening of the second regulating valve 12 at a predetermined timing, and increases the ratio of the low-boiling-point refrigerant circulating in the refrigerant circuit, thereby reducing the low pressure. The pressure is increased, the refrigerant circulation amount in the refrigerant circuit is increased, and the discharge temperature and the high pressure are increased. Therefore, it is possible to shorten the defrosting time, increase the defrosting efficiency, and improve the operation efficiency.

Furthermore, when the air conditioner 200A is equipped with an inverter compressor as the compressor 1, the control unit 51A can perform the COP-up operation as with the control unit 51 of the first embodiment. Here, the control device 50 A stores a frequency adjustment table in which the opening adjustment amounts of the first adjustment valve 11 and the second adjustment valve 12 are associated with the frequency of the compressor 1 in the storage unit 53. Also good. The frequency adjustment table may be configured such that the frequency of the compressor 1 decreases as the opening adjustment amount increases within a range in which the opening adjustment amount increases the opening. Further, the frequency adjustment table may be configured such that the frequency of the compressor 1 increases as the opening adjustment amount increases in a range where the opening adjustment amount indicates the amount by which the opening degree is decreased. That is, the control unit 51 A adjusts the frequency of the opening adjustment amounts of the first adjustment valve 11 and the second adjustment valve 12 when the opening amounts of the first adjustment valve 11 and the second adjustment valve 12 are adjusted. You may make it adjust the frequency of the compressor 1 in light of a table. Other effects and the like are the same as those in the first embodiment.

Each of the above embodiments is a preferred specific example in an air conditioning apparatus and an air conditioning system, and the technical scope of the present invention is not limited to these embodiments. For example, in each of the above-described embodiments, the case where the

air conditioners

200 and 200A are dehumidifiers is illustrated, but the present invention is not limited thereto, and the

air conditioners

200 and 200A have an air conditioning function that performs a heating operation or a cooling operation. It may be a machine. That is, the

air conditioners

200 and 200A may be any air conditioner that can execute at least the dehumidifying operation and the defrosting operation.

1 compressor, 2 condenser, 3 throttle device, 4 evaporator, 5 fan, 6 accumulator, 7 hot gas solenoid valve, 8 1st solenoid valve, 9 2nd solenoid valve, 10 main circuit, 11 1st regulating valve, 12, 2nd regulating valve, 15 hot gas bypass circuit, 20 main piping, 21 discharge piping, 22, 23 liquid piping, 24 suction piping, 24a bypass piping, 24b upstream branching means, 24c downstream branching means, 25 hot gas defrost piping, 25a, first branching means, 25b, second branching means, 31 discharge pipe temperature sensor, 32 high pressure sensor, 33 suction pipe temperature sensor, 34 low pressure sensor, 50, 50A control device, 51, 51A control section, 52 operation section, 53 storage unit, 100, 100A air conditioning system, 200, 200A air conditioning device, 300 Controller.

Claims

A main circuit in which a compressor, a condenser, a throttling device, an evaporator, and an accumulator are sequentially connected, and a non-azeotropic refrigerant mixture including a first refrigerant and a second refrigerant having a boiling point higher than that of the first refrigerant circulates;
A control device for controlling the main circuit;
Have
The main circuit is:
A first regulating valve provided upstream of the accumulator;
A second regulating valve provided downstream of the accumulator;
A bypass pipe connecting between the evaporator and the first regulating valve, between the second regulating valve and the compressor, and bypassing the accumulator;
The control device includes:
The ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor is adjusted by controlling the first adjustment valve and the second adjustment valve, respectively.
Air conditioner.
A circuit connecting the discharge side of the compressor and the condenser, and between the condenser and the throttling device, further comprising a hot gas bypass circuit provided with a hot gas solenoid valve; ,
The control device controls the hot gas bypass circuit.
The air conditioning apparatus according to claim 1.
The control device includes:
During the defrosting operation in which the hot gas solenoid valve is open,
The ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor is increased by opening the first adjustment valve and the second adjustment valve.
The air conditioning apparatus according to claim 2.
The control device includes:
During the defrosting operation, after opening the first adjustment valve and the second adjustment valve,
When the discharge temperature, which is the temperature of the refrigerant discharged from the compressor, reaches a closing reference threshold, the first adjustment valve and the second adjustment valve are closed.
The air conditioning apparatus according to claim 3.
The control device includes:
During the defrosting operation, after closing the first adjustment valve and the second adjustment valve,
The first regulating valve and the second regulating valve are opened when the discharge temperature falls to an open reference temperature set to a temperature lower than the closed reference threshold;
The air conditioning apparatus according to claim 4.
The control device includes:
When detecting the start of the heating amount up mode for increasing the heating amount by the condenser,
The ratio of the first refrigerant in the non-azeotropic refrigerant mixture to be sucked into the compressor is increased by opening the first adjustment valve and the second adjustment valve.
The air conditioner according to any one of claims 2 to 5.
The control device includes:
In the heating amount up mode, after opening the first adjustment valve and the second adjustment valve,
When the discharge temperature, which is the temperature of the refrigerant discharged from the compressor, rises to a closing threshold, the first adjustment valve and the second adjustment valve are closed.
The air conditioning apparatus according to claim 6.
The control device includes:
In the heating amount up mode, after closing the first adjustment valve and the second adjustment valve,
The first regulating valve and the second regulating valve are opened when the discharge temperature falls to an opening threshold set to a temperature lower than the closing threshold;
The air conditioning apparatus according to claim 7.
The control device includes:
During the dehumidifying operation in which the hot gas solenoid valve is closed,
If the suction superheat degree, which is the superheat degree on the suction side of the compressor, is less than or equal to a first threshold value, the non-azeotropy that causes the compressor to suck by opening the first adjustment valve and the second adjustment valve. The ratio of the first refrigerant in the mixed refrigerant is increased.
The air conditioner according to any one of claims 2 to 8.
The control device includes:
During the dehumidifying operation, after opening the first adjustment valve and the second adjustment valve,
When the suction superheat degree reaches a second threshold value set at a temperature higher than the first threshold value, the first regulating valve and the second regulating valve are closed.
The air conditioning apparatus according to claim 9.
The first adjustment valve and the second adjustment valve are electromagnetic valves having an open state and a closed state, respectively.
The control device includes:
When opening the first regulating valve and the second regulating valve, the first regulating valve and the second regulating valve are respectively changed from a closed state to an opened state.
The air conditioner according to any one of claims 3 to 10.
Each of the first adjustment valve and the second adjustment valve is an electronic expansion valve capable of adjusting the opening degree.
The control device includes:
When opening the first adjustment valve and the second adjustment valve, each opening degree of the first adjustment valve and the second adjustment valve is increased.
The air conditioner according to any one of claims 3 to 10.
The compressor is an inverter compressor capable of adjusting the frequency by an inverter,
The control device includes:
When the first regulating valve and the second regulating valve are opened, the frequency of the compressor is lowered.
The air conditioner according to any one of claims 3 to 12.
The main circuit is configured such that air cooled by passing through the evaporator is heated by passing through the condenser.
The air conditioner according to any one of claims 1 to 13.