JP2000346473A - Heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat pump in which a sufficient compositional separation width can be ensured for both cooling and heating conditions through simple arrangement and control and the capacity can be controlled depending on the load by enlarging the capacity control width through regulation of the quantity of refrigerant in a main circuit and compositional control. SOLUTION: Delivery piping of a compressor 11 is coupled through a sub- throttle 20 and a first on/off valve 21 with the column bottom section of a rectifier/separator 17 having column top section coupled with a cooler and a storage unit annularly. The column bottom section of the rectifier/separator 17 is coupled through a sub-throttle 22 with the cooler 18 coupled with the suction piping of the compressor. Further, the piping coupling an outdoor main throttle 20 and an indoor main restrictor 22 is coupled through an on/off valve 23 with the bottom section of the storage unit 19 and non-azeotropic mixed refrigerant is encapsulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a non-azeotropic mixed refrigerant, stores a low-boiling refrigerant by a refrigerant rectification separator, changes the refrigerant composition flowing through a main circuit, and generates a capacity corresponding to a load. The present invention relates to an improvement in a heat pump device that can perform the heat treatment.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 5-44582 discloses a heat pump device which uses a non-azeotropic refrigerant mixture and stores a low-boiling refrigerant by composition separation to vary the main circuit composition.

Hereinafter, the conventional heat pump device will be described with reference to the drawings.

FIG. 5 is a configuration diagram of a refrigeration cycle showing a conventional heat pump device. In FIG. 5, the compressor 1,
The four-way valve 2, the outdoor heat exchanger 3, the main circuit pressure reducing device 4, and the indoor heat exchanger 5 are connected in series. Further, a decompressor 6 is connected to the middle of the condenser 3 and the main circuit decompression device 4, and is connected to the bottom of the rectifying separator 7. A cooler 8 is provided at the top of the rectifying separator 7, and a pipe between the compressor 1 and the four-way valve 2 penetrates therethrough so that heat can be exchanged. The cooler 8 is connected to the top of the fractionator 7 and also serves as a refrigerant storage.

[0005] The lower part of the cooler 8 is connected to the top of the rectifier separator 7, and the gas-phase refrigerant flowing into the rectifier separator 7 is liquefied by the cooler 8 also serving as a reservoir, and the refrigerant is cooled. gas phase,
It flows through due to the specific gravity difference of the liquid phase.

Further, in order to allow the refrigerant liquefied in the cooler 8 to flow out from the bottom of the rectifying separator 7 to the main circuit, the bottom of the rectifying separator 7 is passed through the decompressor 9 to the main circuit pressure reducing device. 4
And the indoor heat exchanger 5.

In the circuit having such a configuration, the refrigerant discharged from the compressor 1 at the time of heating flows into the four-way valve 2 and the indoor heat exchanger 5, and becomes a use side heat exchanger to heat a room or the like. Further, the refrigerant radiated in the indoor heat exchanger 5 is liquefied and divided into a rectification circuit passing through the pressure reducer 9 and a main circuit passing through the main circuit pressure reducing device 4.

The refrigerant passing through the main circuit pressure reducing device 4 evaporates in the outdoor heat exchanger 3, passes through the four-way valve 2, and is sucked into the compressor 2 again.

The refrigerant branched to the rectification circuit is depressurized by the decompression device 9.

[0010] On the other hand, the state of the refrigerant flowing into the rectifying separator 7 depends on the change in the capacity of the indoor heat exchanger 5, the liquid region,
If it changes to a two-phase region and flows into the rectification separator 7 in the liquid region, the compositional separation of the refrigerant as described above is not performed, and the refrigerant rich in low-boiling components circulates, and the capacity increases. On the other hand, if the refrigerant in the two-phase region flows into the rectifier 7, the gas phase rises in the rectifier 7, is cooled and liquefied by the cooler 8, and is stored.
Due to the rectification operation, a refrigerant rich in low-boiling components is stored in the cooler 8, and a refrigerant rich in high-boiling components circulates in the main circuit, so that the capacity can be reduced.

[0011]

However, in such a conventional heat pump device, if the separation is to be performed in both the refrigerant and the heating, it is necessary to set the decompressors 6 and 9 to the same throttle opening. Therefore, the pressure of the rectification separator 7 becomes the intermediate pressure of the main circuit, and the rectification separation also operates at this pressure. Accordingly, the temperature at the top of the fractionator 7 has a large amount of low-boiling components, and the saturation temperature for liquefying the rising gas phase becomes lower.

On the other hand, since the suction pipe between the compressor 1 and the four-way valve 2 is used as a cooling source of the cooler 8, the compressor 1
If the suction superheat degree is large, the refrigerant temperature of the cooling source rises, so that the temperature for liquefying the gas phase at the top of the tower becomes insufficient, and the amount of cooling heat is insufficient.
In the case of separating a non-azeotropic mixed refrigerant having a relatively large difference in boiling point, the separation width is small and the capacity control width is small.

Further, since the decompression devices 6 and 9 are always in an open state, the refrigerant is always stored in the cooler 8 and the refrigerant amount cannot be adjusted, so that the capacity cannot be controlled by the refrigerant amount. Was.

The present invention has been made to solve the conventional problems, and it is possible to obtain a sufficient composition separation width under any operating condition of cooling and heating, and also in a non-azeotropic mixed refrigerant having a large boiling point difference. It is another object of the present invention to provide a heat pump device capable of controlling the capacity of the main circuit by adjusting the amount of refrigerant in a short time, thereby expanding the capacity control range.

[0015]

In order to achieve this object, the present invention relates to a method in which a discharge pipe of a main circuit and a bottom of a rectifying separator tower are connected to a sub-throttle device via an on-off valve, and the top side Using the latent heat of the liquid refrigerant flowing out of the bottom as a refrigerant source for
Not only can the cooler be reduced in size, but it is also possible to liquefy the gas phase of the rectifier at a sufficiently low temperature and cooling heat, and to use a refrigerant with a large amount of low-boiling components even in a non-azeotropic mixed refrigerant having a large boiling point difference. The separation width can be reserved to increase the separation width.

Further, since the amount of refrigerant in the main circuit can be adjusted by controlling the refrigerant in the reservoir to be stored or empty, a wide range of capacity control can be performed by controlling the capacity based on the refrigerant amount and controlling the capacity based on the refrigerant composition. It becomes possible.

Further, since the liquid pipe connecting the outdoor main throttle device and the indoor main throttle device and the bottom of the reservoir are connected via the on-off valve, the opening and closing operation of the on-off valve allows the storage in a short time. The refrigerant can flow into and out of the vessel, and the capacity control by adjusting the refrigerant amount can be performed in a short time.

Also, the present invention detects the temperature of the intake air of the indoor unit and determines that the difference from the set temperature is equal to or less than a predetermined value, that is,
If the cooling and heating capacity becomes excessive compared to the indoor load, open the on-off valve between the bottom of the reservoir and the liquid pipe, and open the on-off valve between the tower bottom of the rectification separator and the compressor discharge pipe. With a simple control of closing, the refrigerant is stored in the reservoir in a short time to reduce the amount of refrigerant in the main circuit, then the on-off valve between the bottom of the reservoir and the liquid pipe is closed, and rectification separation The low-boiling components are stored in the reservoir by performing rectification and separation by simple control of opening the on-off valve between the bottom of the vessel and the compressor discharge pipe, and the main circuit refrigerant composition is shifted to the high-boiling side. When the difference between the set temperature and the set temperature is more than a certain value, that is, when the cooling and heating capacity is insufficient compared with the indoor load, the tower bottom of the rectifying separator and the compressor discharge can be changed. Simple opening and closing valves between the piping and the bottom of the reservoir and the liquid piping In your only, to almost empty the refrigerant quantity in the reservoir, to increase the refrigerant amount of the main circuit, it is possible to perform the capacity improved by returning the refrigerant composition on the basis of the fill composition.

Further, according to the present invention, there is provided a liquid refrigerant flowing out of the bottom as a cooling source on the top side by connecting the discharge pipe of the main circuit and the bottom of the tower of the rectifying separator via an on-off valve. The use of the latent heat of not only makes the cooler smaller,
The gas phase of the rectifier can be liquefied at a sufficiently low temperature and heat of cooling, and even a non-azeotropic mixed refrigerant with a large difference in boiling point can store a large amount of low-boiling-point components to increase the separation width. it can.

Further, since the amount of refrigerant in the main circuit can be adjusted by controlling the refrigerant in the reservoir to be stored or empty, a wide range of capacity control can be achieved by controlling the capacity based on the amount of refrigerant and controlling the capacity based on the composition of the refrigerant. It becomes possible.

Further, since the liquid pipe connecting the outdoor main throttle device and the indoor main throttle device and the bottom of the reservoir are connected via the on-off valve, opening and closing the on-off valve allows the reservoir to be operated in a short time. The refrigerant can be made to flow into and out of the refrigerant, and the capacity control by adjusting the refrigerant amount can be performed in a short time.

Further, since the indoor / outdoor main throttle device which can be fully closed is used, even when the compressor is stopped during the rectification separation operation, the main throttle device is fully closed and the main circuit is shifted to the high pressure side and the low pressure side. By separating, the gas discharged from the compressor can be supplied to the rectification separator, and the separation operation can be continued even when the compressor is stopped until the pressure in the main circuit is balanced.

Also, the present invention detects the temperature of the intake air of the indoor unit and determines that the difference from the set temperature is equal to or less than a predetermined value, that is,
If the cooling / heating capacity is excessive compared to the indoor load, open the on-off valve between the bottom of the reservoir and the liquid pipe, and close the on-off valve between the bottom of the rectifying separator and the compressor discharge pipe. With a simple control, the refrigerant is stored in the reservoir in a short time to reduce the amount of refrigerant in the main circuit, and then the on-off valve between the reservoir bottom and the liquid pipe is closed, and the rectification separator The simple control of opening and closing the on-off valve between the bottom of the tower and the discharge pipe of the compressor allows rectification and separation to be performed, thereby storing low-boiling components in the storage tank and changing the main circuit refrigerant composition to the high-boiling side. If the difference between the set temperature and the set temperature is more than a certain value, that is, if the cooling and heating capacity is insufficient compared with the indoor load, the tower bottom of the rectification separator and the compressor discharge pipe Simple control of opening the on-off valve between the reservoir and the on-off valve between the reservoir bottom and the liquid pipe In body, the almost empty amount of the refrigerant reservoir, to increase the refrigerant amount of the main circuit, it is possible to perform the capacity improved by returning the refrigerant composition on the basis of the fill composition.

Further, when the compressor is stopped during the separation operation, the separation operation can be continued until the pressures in the main circuit are balanced even when the compressor is stopped by only simple control of completely closing the main throttle device. it can.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device,
A rectification separator having a circuit in which an indoor main throttle device and an indoor heat exchanger are connected by piping to form a main circuit of a refrigerating cycle, and a discharge pipe of the compressor and a circuit in which a cooler and a storage device are connected in a ring at a tower top. The bottom of the rectifier is connected via a first sub-throttling device and a first on-off valve, and the bottom of the rectifying separator and the cooler are connected via a second sub-throttling device, Further, the cooler and the suction pipe of the compressor are connected, and further, the pipe connecting the outdoor main throttle device and the indoor main throttle device and the bottom of the reservoir are connected through a second on-off valve. This is a heat pump device characterized by connecting and enclosing a non-azeotropic mixed refrigerant.If the load required for cooling and heating capacity is large, the reservoir can be emptied in a short time to increase the amount of main circuit refrigerant, and The rectification is not performed and the main circuit is By operating in the stomach condition, it is possible to perform high-capacity operation commensurate with the load.

When the load which does not require much cooling and heating capacity is small, the amount of refrigerant in the main circuit is reduced by holding the refrigerant in the reservoir in a short time, and the stored refrigerant is removed by performing rectification and separation. With a refrigerant composition rich in low boiling point components,
By operating the main circuit in a state in which the amount of the refrigerant rich in the high boiling point component is small, the capacity can be saved according to the load.

According to a second aspect of the present invention, in the first aspect of the present invention, an indoor temperature sensor for detecting an intake air temperature in the indoor unit is provided, and a preset set air temperature and the indoor temperature sensor are provided. When the temperature difference with the suction air temperature detected in the below becomes a certain value or less, after opening the second on-off valve for a certain period of time while the first on-off valve is closed, the first on-off valve Opening and closing the second on-off valve, and when the temperature difference between the set air temperature and the suction air temperature becomes a certain value or more, the first on-off valve and the second on-off valve This is a method for controlling the operation of a heat pump device, characterized in that the load can be determined by simple sensing, and the amount of main circuit refrigerant and the main circuit composition can be varied with a simple configuration of opening and closing an open / close valve. And load Flip capacity control can be carried out.

According to a third aspect of the present invention, a compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device that can be fully closed, an indoor main throttle device that can be fully closed, and an indoor heat exchanger are piped. The first sub-throttling device is connected to form a main circuit of a refrigeration cycle, and a discharge pipe of the compressor and a tower top of a rectifying separator having a circuit in which a cooler and a reservoir are connected in a ring at the tower top. And a first on-off valve, and also connects the tower bottom of the rectifying separator and the cooler via a second sub-throttling device, and also connects the cooler and the suction pipe of the compressor. And further, a pipe connecting the fully-closeable outdoor main throttle device and the fully-closeable indoor main throttle device and the bottom of the reservoir are connected via a second on-off valve, A heat pump device in which a non-azeotropic mixed refrigerant is sealed. The use, it is possible to perform the capabilities save commensurate with the load by capability control and rectification separation action by the refrigerant amount control in a short time.

Further, even when the compressor is stopped during the rectification separation operation, the main circuit can be separated into the high pressure side and the low pressure side by fully closing the outdoor main throttle device and the indoor main throttle device. Rectification and separation operation can be continued until the equilibrium is satisfied, and the time required for separation can be reduced.

According to a fourth aspect of the present invention, in accordance with the third aspect of the present invention, there is provided an indoor temperature sensor for detecting an intake air temperature in the indoor unit, and a preset set air temperature and the indoor temperature sensor are provided. When the temperature difference with the suction air temperature detected in the below becomes a certain value or less, after opening the second on-off valve for a certain period of time while the first on-off valve is closed, the first on-off valve Opening and closing the second on-off valve, and when the temperature difference between the set air temperature and the suction air temperature becomes a certain value or more, the first on-off valve and the second on-off valve When the compressor is stopped in a state where the first on-off valve is opened and the second on-off valve is closed, the outdoor main throttle device and the indoor main throttle device are fully closed. Features of heat pump equipment It is a method of controlling the load, and it is possible to judge the magnitude of the load with simple sensing, and it is possible to control the capacity according to the load by changing the amount of main circuit refrigerant and the main circuit composition with a simple configuration called open / close valve operation .

Further, even if the compressor is stopped during the rectifying / separating operation, the rectifying / separating operation can be continued with a simple structure of fully closing the main expansion device.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat pump device according to the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a system configuration diagram of a heat pump apparatus according to Embodiment 1 of the present invention, in which a non-azeotropic mixed refrigerant is sealed, a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, Outdoor main throttle device 14, indoor main throttle device 1
5. The indoor heat exchanger 16 is connected in series to form a main circuit of the refrigeration cycle.

Reference numeral 17 denotes a rectification separator, which is constituted by a straight pipe filled with a filler (not shown).
The tower top of the rectifier 17 constitutes a circuit that connects the cooler 18 and the reservoir 19 in series and returns to the tower top of the rectifier 17 again. It is connected to the discharge pipe of the compressor 11 via the sub-throttle device 20 and the on-off valve 21. Similarly, the bottom of the rectifier 17 is
It is connected to the cooler 18 via the sub-throttling device 22, where it is configured to indirectly exchange heat with the circuit at the top of the rectifying separator 17, and furthermore, the suction between the compressor 11 and the four-way valve 12. Connected to piping. In addition, the bottom of the reservoir 19 is connected to the outdoor main throttle device 14 and the indoor main throttle device 1 through an on-off valve 23.
5 is connected to the liquid pipe.

An indoor unit 24 includes the indoor heat exchanger 16 and the like. The indoor unit 24 includes a temperature sensor 25 for detecting the indoor air temperature (that is, the temperature of the intake air of the indoor unit 24). Reference numeral 26 denotes an arithmetic unit for comparing the preset air temperature with the air temperature detected by the temperature sensor 25 to perform an arithmetic operation, and 27 receives the arithmetic result of the arithmetic unit 26 and controls the opening and closing of the on-off valve. An on-off valve control device.

Next, the operation of the refrigeration cycle having such a configuration will be described with reference to FIG.
FIG. 2 is a control flowchart of the heat pump device according to the first embodiment of the present invention.

When cooling performance is required, such as immediately after the compressor 11 is started during cooling, the on-off valves 21 and 23
Is closed (STEP 1). The high-pressure gas refrigerant discharged from the compressor 11 in this state passes through the four-way valve 12, flows into the outdoor heat exchanger 13 and is condensed to become a high-pressure liquid refrigerant, and the intermediate pressure between the discharge pressure and the suction pressure by the outdoor main throttle device 14. After being reduced to a low-pressure two-phase refrigerant near the suction pressure by the indoor main expansion device 15, the indoor heat exchanger 16
And is sucked into the compressor 11 again through the four-way valve 12.

In such a refrigeration cycle, the load is determined (STEP 2), and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature set in the arithmetic unit 26 is a constant value. If it is larger than t, that is, if the cooling load is large, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the on-off valve control device 27, and the on-off valve 21 and the on-off valve 23 are kept closed ( (STEP 1). That is, the refrigerant discharged from the compressor 11 circulates only in the main circuit.

On the other hand, since the on-off valve 21 and the on-off valve 23 of the rectifying separator 17, the cooler 18, and the reservoir 19 are closed and connected to the suction pipe of the compressor 11, low-pressure gas is generated and almost no refrigerant is stored. Absent.

In this way, the refrigerant in the main circuit is a non-azeotropic mixed refrigerant mixed with the filling composition as it is, and is operated with a large amount of refrigerant.

Next, a load determination is made (STEP 2). If the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the arithmetic unit 26 is smaller than a certain value t, That is, when the cooling load is small, a signal for closing the on-off valve 21 and opening the on-off valve 23 is transmitted from the on-off valve control device 27, and the on-off valve 21 is closed and the on-off valve 23 is opened (STEP 3). This state is maintained for a certain period of time (STEP 4). By doing so, a liquid or a two-phase refrigerant having a high density can be stored directly in the storage device, and the main circuit is operated with a small amount of the refrigerant, and the capacity can be saved in a short time.

Thereafter, the on-off valve 21 is opened and the on-off valve 23 is opened.
Is transmitted from the on-off valve control means 27, the on-off valve 21 is opened, and the on-off valve 23 is closed (STE).
P5). As a result, a part of the high-pressure gas is diverted from the discharge pipe of the compressor 11 and passes through the on-off valve 21, and the sub-throttling device 20
The gas refrigerant depressurized by the above flows into the bottom of the rectifier 17 and rises inside the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the top of the rectification separator 17, where And flows into the sub-throttle device 22 from the bottom of the fractionator 17, and the decompressed two-phase refrigerant passes through the cooler 18 and flows into the suction pipe between the compressor 11 and the four-way valve 12. . At this time, the cooler 18 indirectly exchanges heat between the low-temperature two-phase refrigerant depressurized by the sub-throttle device 22 and the gas refrigerant flowing into the cooler 18 from the top of the fractionator 17.

Here, since a low-temperature, low-pressure two-phase refrigerant having the lowest enthalpy in the cycle is used as a cooling source of the cooler 18, the latent heat can be effectively used, and the cooler 18 can be reduced in size. The gas at the top of the fractionator 17 can be reliably liquefied.

Thus, the gas refrigerant flowing from the bottom of the fractionator 17 is cooled by the cooler 18 and liquefied.
It is stored in the storage device 19 and returns to the top of the rectifying separator 17 again to descend the rectifying separator 17. When this state occurs continuously, the gas refrigerant ascending in the rectifier 17 and the liquid refrigerant ascending rise in the rectifier 17 due to gas-liquid contact in the rectifier 17, and a rectification action occurs in the reservoir 19 gradually. The refrigerant composition having a low boiling point is stored, and the refrigerant passing down the rectifying separator 17 and passing through the sub-throttling device 22 gradually becomes a composition having a high boiling point, and is supplied to the compressor 11 via the cooler 18. Inhaled.

In this manner, the main circuit gradually becomes a refrigerant composition having a high boiling point, and the capacity can be saved. Further, since the low-boiling-point refrigerant is stored in the storage device 19, the amount of refrigerant in the main circuit can be reduced, and the effect of reducing the amount of refrigerant is also added, thereby further contributing to capacity saving and having a low capacity suitable for the load. Can be driven.

In this state, the load is determined (STEP
6) When the cooling load increases and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the calculation device 26 becomes larger than a certain value t, the on-off valve 23 Opening signal of the open / close valve controller 27
And the on-off valve 23 is opened again (STEP 7).
This state is maintained for a predetermined time (STEP 8). As a result, the refrigerant stored in the reservoir 19 flows out to the main circuit side, and thereafter, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the on-off valve control device 27 and the on-off valve 21 and the on-off valve 2
3 is closed (STEP 1). As a result, the amount of refrigerant in the main circuit increases in a short time and returns to the high-capacity filling composition, so that operation with a large capacity corresponding to the load can be resumed.

As described above, the magnitude of the load is detected based on the difference between the intake air temperature of the indoor unit 24 and the set air temperature, and only the simple operation of opening and closing the on-off valves 21 and 23 opens and closes the main circuit. The capacity control can be performed by changing the refrigerant amount and the refrigerant composition to a state corresponding to the load.

Next, at the time of the heating operation, the operation is the same except that the refrigerant flow direction is only the reverse direction in the main circuit.

That is, when heating capacity is required, for example, immediately after the compressor 11 is started, the on-off valve 21 and the on-off valve 2
3 is closed (STEP 1). The high-pressure gas refrigerant discharged from the compressor 11 in this state passes through the four-way valve 12, flows into the indoor heat exchanger 16 and is condensed to become a high-pressure liquid refrigerant, and the main throttle device 15 increases the pressure to an intermediate pressure between the discharge pressure and the suction pressure. After the pressure is reduced, the pressure is further reduced to a low-pressure two-phase refrigerant near the suction pressure by the indoor main expansion device 14, and then is vaporized and gasified by the outdoor heat exchanger 13 and is sucked into the compressor 11 again through the four-way valve 12. .

In such a refrigeration cycle, load determination is performed (STEP 2), and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature set in the arithmetic unit 26 is a constant value. When it is larger than t, that is, when the heating load is large, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the on-off valve control device 27, and the on-off valve 21 and the on-off valve 23 are kept closed. (STEP 1). That is, the refrigerant discharged from the compressor 11 circulates only in the main circuit.

On the other hand, since the on-off valve 21 and the on-off valve 23 of the rectifying separator 17, the cooler 18, and the reservoir 19 are closed and connected to the suction pipe of the compressor 11, low-pressure gas is generated and almost no refrigerant is stored. Absent.

By doing so, the refrigerant in the main circuit is a non-azeotropic mixed refrigerant mixed with the filling composition as it is, and is operated with a large amount of refrigerant.

Next, a load determination is made (STEP 2), and when the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the arithmetic unit 26 is smaller than a fixed value t, that is, When the heating load is small, a signal for closing the on-off valve 21 and opening the on-off valve 23 is transmitted from the on-off valve control device 27, closing the on-off valve 21 and opening the on-off valve 23 (STEP 3). The state is maintained for a certain period of time (STEP 4). By doing this,
A high-density liquid or two-phase refrigerant can be stored directly in the storage device 19, and the main circuit is operated with a small amount of refrigerant, so that the capacity can be saved in a short time.

Thereafter, the on-off valve 21 is opened, and the on-off valve 23 is opened.
Is transmitted from the on-off valve control device 27, the on-off valve 21 is opened, and the on-off valve 23 is closed (STE).
P5). As a result, a part of the high-pressure gas is diverted from the discharge pipe of the compressor 11 and passes through the on-off valve 21 so that the sub-throttling device 2
The gas refrigerant decompressed by 0 flows into the bottom of the rectifier 17 and rises in the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the top of the rectification separator 17, where And flows into the sub-throttling device 22 from the bottom of the fractionator 17, where the pressure is reduced and the two-phase refrigerant passes through the cooler 18 and flows into the suction pipe between the compressor 11 and the four-way valve 12. At this time, in the cooler 18, the low-temperature two-phase refrigerant depressurized by the sub-throttling device 22 and the cooler 1
Heat exchange is indirectly performed with the gas refrigerant flowing into the gas refrigerant 8.

Here, since a low-temperature, low-pressure two-phase refrigerant having the lowest enthalpy in the cycle is used as a cooling source of the cooler 18, the latent heat can be effectively used, and the cooler 18 can be reduced in size. Thus, the gas refrigerant at the top of the fractionator 17 can be reliably liquefied.

In this way, the refrigerant flowing from the bottom of the rectifying separator 17 is cooled by the cooler 18 to be liquefied, stored in the storage 19, and the storage amount is gradually increased. It returns to the top of the separator 17 and descends the rectifier 17. When this state occurs continuously, the gas refrigerant ascending in the rectifier 17 and the liquid refrigerant ascending rise in the rectifier 17 due to gas-liquid contact in the rectifier 17, and a rectification action occurs in the reservoir 19 gradually. The refrigerant composition having a low boiling point is stored, and the refrigerant passing down the rectifying separator 17 and passing through the sub-throttling device 22 gradually becomes a composition having a high boiling point, and is supplied to the compressor 11 via the cooler 18. Inhaled.

In this way, the main circuit gradually becomes a refrigerant composition having a high boiling point, and the capacity can be saved. Further, since the low-boiling-point refrigerant is stored in the storage device 19, the amount of refrigerant in the main circuit can be reduced, and the effect of reducing the amount of refrigerant is also added, thereby further contributing to capacity saving and having a low capacity suitable for the load. Can be driven.

In this state, load determination is performed (STEP
6) When the heating load increases and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the calculation device 26 becomes larger than a certain value t, the on-off valve 23 Opening signal of the open / close valve controller 27
And the on-off valve 23 is opened again (STEP 7).
This state is maintained for a predetermined time (STEP 8). As a result, the refrigerant stored in the reservoir 19 flows out to the main circuit side, and thereafter, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the on-off valve control device 27 and the on-off valve 21 and the on-off valve 2
3 is closed (STEP 1). As a result, the amount of refrigerant in the main circuit increases in a short time and returns to the high-capacity filling composition, so that operation with a large capacity corresponding to the load can be resumed.

As described above, the magnitude of the load is detected based on the difference between the intake air temperature of the indoor unit 24 and the set air temperature, and only the simple operation of opening and closing the on-off valves 21 and 23 opens and closes the main circuit. The capacity control can be performed by changing the refrigerant amount and the refrigerant composition to a state corresponding to the load.

(Embodiment 2) FIG. 3 is a system configuration diagram of a heat pump apparatus according to Embodiment 2 of the present invention.
Components having the same configuration and the same function as those described above are denoted by the same reference numerals, and description thereof will be omitted.

Here, a non-azeotropic refrigerant mixture is sealed, and an outdoor main throttle device 28 that can be fully closed and an indoor main throttle device 29 that can be fully closed are connected in series between the outdoor heat exchanger 13 and the indoor heat exchanger 16. It is installed in.

Next, the operation of the refrigeration cycle having such a configuration will be described with reference to FIG. FIG. 4 is a control flowchart of the heat pump device according to the second embodiment of the present invention.

When cooling performance is required, for example, immediately after the compressor 11 is started during cooling, the on-off valve 21 and the on-off valve 23
The high-pressure gas refrigerant discharged from the compressor 11 in the closed state passes through the four-way valve 12 and flows into the outdoor heat exchanger 13 to be condensed to become a high-pressure liquid refrigerant, which is intermediate between the discharge pressure and the suction pressure by the outdoor main throttle device 28. After the pressure is reduced to a low-pressure two-phase refrigerant near the suction pressure by the indoor main expansion device 29, the refrigerant is vaporized and gasified by the indoor heat exchanger 16 and returned to the compressor 11 via the four-way valve 12. Inhaled.

In such a refrigeration cycle, the load is determined (STEP 2), and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature set in the arithmetic unit 30 is a constant value. When it is larger than t, that is, when the cooling load is large, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the drive valve control device 31, and the on-off valve 21 and the on-off valve 23 are kept closed ( (STEP 1). That is, the refrigerant discharged from the compressor 11 circulates only in the main circuit.

On the other hand, since the on-off valve 21 and the on-off valve 23 are closed and connected to the suction pipe of the compressor 11, the rectification separator 17, the cooler 18, and the storage device 19 become low-pressure gas, and almost no refrigerant is stored. Absent.

In this way, the refrigerant in the main circuit is a non-azeotropic mixed refrigerant mixed with the filling composition as it is, and is operated in a state of a large amount of refrigerant, so that operation with a large capacity suitable for the load can be performed.

Next, a load determination is made (STEP 2). If the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the arithmetic unit 31 is smaller than a certain value t, That is, when the cooling load is small, a signal for closing the on-off valve 21 and opening the on-off valve 23 is transmitted from the drive valve control device 31 to close the on-off valve 21 and open the on-off valve 23 (STEP 3). This state is maintained for a certain period of time (STEP 4). By doing so, a liquid or a two-phase refrigerant having a high density can be stored directly in the storage device, and the main circuit is operated with a small amount of the refrigerant, and the capacity can be saved in a short time.

Thereafter, the on-off valve 21 is opened and the on-off valve 23 is opened.
Is transmitted from the drive valve control device 31, the on-off valve 21 is opened, and the on-off valve 23 is closed (STE).
P5). As a result, a part of the high-pressure gas is diverted from the discharge pipe of the compressor 11 and passes through the on-off valve 21 so that the sub-throttling device 2
The gas refrigerant decompressed by 0 flows into the bottom of the rectifier 17 and rises in the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the top of the rectification separator 17, where And flows into the sub-throttle device 22 from the bottom of the fractionator 17, and the decompressed two-phase refrigerant passes through the cooler 18 and flows into the suction pipe between the compressor 11 and the four-way valve 12. .

The on-off valve 21 is opened and the on-off valve 23 is opened.
Is closed, that is, during the rectification separation operation, the stop of the compressor 11 is detected (STEP 6), and the main throttle device 2 is detected.
8 and 29 are not fully closed (STEP
7), a stop signal of the compressor 11 is transmitted from the arithmetic unit 30 to the drive valve control device 31, a signal for completely closing the outdoor main throttle device 28 and the indoor main throttle device 29 is transmitted, and the outdoor main throttle device 28 and the indoor The main throttle device 29 is fully closed (S
TEP8). As a result, the main circuit is separated into a high pressure side and a low pressure side. The high pressure side refrigerant passes through the on-off valve 21, and the gas refrigerant depressurized by the sub-throttle device 20 is separated by the rectification separator 17.
And rises inside the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the tower top of the rectification separator 17, and the rectification separator 17 It descends, flows into the sub-throttling device 22 from the bottom of the fractionator 17, and the decompressed two-phase refrigerant passes through the cooler 18 until the low-pressure side pressure and the high-pressure side pressure are balanced. It flows out to the suction pipe between the valves 12. At this time, the cooler 18
In this case, the low-temperature two-phase refrigerant decompressed by the sub-throttling device 22 and the gas refrigerant flowing into the cooler 18 from the top of the fractionator 17 indirectly exchange heat.

Here, since a low-temperature, low-pressure two-phase refrigerant having the lowest enthalpy in the cycle is used as a cooling source of the cooler 18, the latent heat can be effectively used, and the cooler 18 can be reduced in size. The gas at the top of the fractionator 17 can be reliably liquefied.

As described above, the gas refrigerant flowing from the bottom of the fractionator 17 is cooled by the cooler 18 and liquefied.
It is stored in the storage device 19 and returns to the top of the rectifying separator 17 again to descend the rectifying separator 17. When this state occurs continuously, the gas refrigerant ascending in the rectifier 17 and the liquid refrigerant ascending rise in the rectifier 17 due to gas-liquid contact in the rectifier 17, and a rectification action occurs in the reservoir 19 gradually. The refrigerant composition having a low boiling point is stored, and the refrigerant passing down the rectifying separator 17 and passing through the sub-throttling device 22 gradually becomes a composition having a high boiling point, and is supplied to the compressor 11 via the cooler 18. Inhaled.

In this way, the main circuit gradually becomes a refrigerant composition having a high boiling point, and the capacity can be saved. Further, since the low-boiling-point refrigerant is stored in the storage device 19, the amount of refrigerant in the main circuit can be reduced, and the effect of reducing the amount of refrigerant is also added, thereby further contributing to capacity saving and having a low capacity suitable for the load. Can be driven. Further, even when the compressor is stopped during the rectification separation operation, the rectification separation operation can be continued until the pressure in the cycle is balanced.

In this state, the load is determined (STEP
9) When the cooling load increases and the difference between the suction air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the calculation device 30 becomes larger than a certain value t, the on-off valve 23 An opening signal is transmitted from the drive valve control device 31 and the on-off valve 23 is opened again (STEP 1).
2). At this time, after the load determination (STEP 9), the compressor operation determination (STEP 10) is performed. When the stop of the compressor is detected, the opening degree of the main throttle devices 28 and 29 is set (S9).
(TEP11), and thereafter, proceed to STEP12.

As a result, the refrigerant stored in the storage device 19 flows out to the main circuit side, and thereafter, a signal for closing the on-off valves 21 and 23 is transmitted from the drive valve control device 31 and the on-off valves 21 and 23 is closed, the amount of refrigerant in the main circuit increases in a short time and returns to a high-capacity filling composition, and operation with a large capacity corresponding to the load can be resumed.

As described above, the magnitude of the load is detected by the difference between the intake air temperature of the indoor unit 24 and the set air temperature, and only the simple operation of opening and closing the on-off valves 21 and 23 opens and closes the main circuit. The capacity control can be performed by changing the refrigerant amount and the refrigerant composition to a state corresponding to the load.

Next, during the heating operation, the operation is the same except that the flow direction of the refrigerant in the main circuit is only the opposite direction.

That is, when the heating capacity is required, for example, immediately after the compressor 11 is started, the on-off valve 21 and the on-off valve 2
Reference numeral 3 denotes a high-pressure gas refrigerant discharged from the compressor 11 in a closed state, passes through the four-way valve 12, flows into the indoor heat exchanger 16 and is condensed to become a high-pressure liquid refrigerant, and the discharge pressure and suction pressure of the indoor main throttle device 29 are reduced. After the pressure is reduced to the intermediate pressure, the pressure is further reduced to a low-pressure two-phase refrigerant near the suction pressure by the outdoor main throttle device 28, and the refrigerant is evaporated and gasified by the outdoor heat exchanger 13 to the compressor 11 via the four-way valve 12. It is inhaled again.

In such a refrigeration cycle, load determination is performed (STEP 1), and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature set in the arithmetic unit 30 is a constant value. When it is larger than t, that is, when the heating load is large, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the drive valve control device 31, and the on-off valve 21 and the on-off valve 23 are kept in a closed state ( (STEP 1). That is, the refrigerant discharged from the compressor 11 circulates only in the main circuit.

On the other hand, since the on-off valve 21 and the on-off valve 23 of the rectifying separator 17, the cooler 18, and the reservoir 19 are closed and connected to the suction pipe of the compressor 11, low-pressure gas is generated and almost no refrigerant is stored. Absent.

In this way, the refrigerant in the main circuit is a mixed non-azeotropic refrigerant mixed with the filling composition as it is, and is operated with a large amount of refrigerant, so that operation with a large capacity suitable for the load can be performed.

Next, a load determination is made (STEP 2). If the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the arithmetic unit 30 is smaller than a predetermined value t, That is, when the heating load is small, a signal for closing the on-off valve 21 and opening the on-off valve 23 is transmitted from the drive valve control device 31, closing the on-off valve 21 and opening the on-off valve 23 (STEP 3). This state is maintained for a certain period of time (STEP 4). In this way, the liquid or the two-phase refrigerant having a high density can be directly stored in the reservoir 19.
And the main circuit is operated with a small amount of refrigerant, so that the capacity can be saved in a short time.

Thereafter, the on-off valve 21 is opened, and the on-off valve 23 is opened.
Is transmitted from the drive valve control device 31, the on-off valve 21 is opened, and the on-off valve 23 is closed (STE).
P5). As a result, a part of the high-pressure gas is diverted from the discharge pipe of the compressor 11 and passes through the on-off valve 21 so that the sub-throttling device 2
The gas refrigerant decompressed by 0 flows into the bottom of the rectifier 17 and rises in the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the top of the rectification separator 17, where And flows into the sub-throttling device 22 from the bottom of the fractionator 17, where the pressure is reduced and the two-phase refrigerant passes through the cooler 18 and flows into the suction pipe between the compressor 11 and the four-way valve 12.

The on-off valve 21 is opened and the on-off valve 23 is opened.
Is closed, that is, the stop of the compressor 11 is detected during the rectification separation operation (STEP 6), and the main throttle device 28,
When it is detected that 29 is not fully closed (STEP 7),
A signal for stopping the compressor 11 is transmitted from the arithmetic unit 30 to the drive valve control device 31, a signal for fully closing the outdoor main throttle device 28 and the indoor main throttle device 29 is transmitted, and the outdoor main throttle device 28 and the indoor main throttle device are transmitted. 29 is fully closed (STEP
8).

As a result, the main circuit is separated into a high-pressure side and a low-pressure side. The high-pressure side refrigerant passes through the on-off valve 21, and the gas refrigerant decompressed by the sub-throttle device 20 is supplied to the rectification separator 17.
And rises inside the rectifier 17.

After that, it flows into the cooler 18 and
The liquid refrigerant condensed and liquefied in is stored in the storage device 19, and the liquid refrigerant stored earlier is returned from the bottom of the storage device 19 to the top of the rectification separator 17, where And flows into the sub-throttle device 22 from the bottom of the fractionator 17 and the reduced-pressure two-phase refrigerant passes through the cooler 18 until the low-pressure side pressure and the high-pressure side pressure are balanced. It flows out to the suction pipe between the four-way valves 12. At this time, the cooler 1
At 8, the low-temperature two-phase refrigerant depressurized by the sub-throttling device 22 and the gas refrigerant flowing into the cooler 18 from the top of the fractionator 17 indirectly exchange heat.

Here, since a low-temperature and low-pressure two-phase refrigerant having the lowest enthalpy in the cycle is used as a cooling source of the cooler 18, the latent heat can be effectively used, and the cooler 18 can be reduced in size. Thus, the gas refrigerant at the top of the fractionator 17 can be reliably liquefied.

In this way, the refrigerant flowing from the bottom of the rectifying separator 17 is cooled by the cooler 18 to be liquefied, stored in the storage unit 19, and the storage amount is gradually increased. The rectifier 17 is returned to the top of the separator 17 to descend. When this state occurs continuously, the gas refrigerant rising in the rectifying separator 17 and the liquid refrigerant descending in the rectifying separator 17 cause gas-liquid contact in the rectifying separator 17 to perform a rectifying action, and the reservoir 19 is gradually lowered. The refrigerant composition having a high boiling point is stored, and the refrigerant passing down the rectifying separator 17 and passing through the sub-throttle device 22 gradually becomes a composition having a high boiling point, and is sucked into the compressor 11 via the cooler 18. Is done.

In this manner, the main circuit gradually becomes a refrigerant composition having a high boiling point, and the capacity can be saved. Further, since the low-boiling-point refrigerant is stored in the storage device 19, the amount of refrigerant in the main circuit can be reduced, and the effect of reducing the amount of refrigerant is also added, thereby further contributing to capacity saving and having a low capacity suitable for the load. Can be driven. In addition, even when the compressor is stopped during the rectifying operation, the rectifying operation can be continued until the cycle internal pressure is balanced.

In this state, load determination is performed (STEP
9) When the heating load increases and the difference between the intake air temperature of the indoor unit 24 detected by the temperature sensor 25 and the set air temperature calculated by the calculation device 30 becomes larger than a certain value t, the on-off valve 23 Release signal of the drive valve controller 31
And the on-off valve 23 is opened again (STEP 1).
2). At this time, after the load determination (STEP 9), the compressor operation determination (STEP 10) is performed, and when the stop of the compressor is detected, the opening degree of the main throttle devices 28 and 29 is set (S9).
(TEP11), and thereafter, proceed to STEP12. As a result, the refrigerant stored in the reservoir 19 flows out to the main circuit side, and thereafter, a closing signal of the on-off valve 21 and the on-off valve 23 is transmitted from the drive valve control device 31, and the on-off valve 21 and the on-off valve 23 are closed. As a result, the amount of refrigerant in the main circuit increases in a short time and returns to a high-capacity filling composition, so that operation with a large capacity corresponding to the load can be resumed.

As described above, the magnitude of the load is detected based on the difference between the intake air temperature of the indoor unit 24 and the set air temperature, and only the simple operation of opening and closing the on-off valves 21 and 23 opens and closes the main circuit. The capacity control can be performed by changing the refrigerant amount and the refrigerant composition to a state corresponding to the load.

Although the compressor is not described in the embodiment, it is not limited to a constant speed compressor, but has a capacity control means such as a pole change compressor or a cylinder bypass.
Alternatively, a variable speed compressor using an inverter can be used, and the case where these are used is also included in the present invention.

Also, as the on-off valve, an electronic expansion valve or a manual valve which can shut off the flow of the refrigerant can be considered, and the use of these is also included in the present invention.

[0098]

As described above, according to the first aspect of the present invention, a non-azeotropic mixed refrigerant is charged, and a compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device, an indoor main throttle device, Connecting the indoor heat exchanger with piping to form the main circuit of the refrigeration cycle,
The discharge pipe of the compressor and the tower bottom of the rectifier having a circuit in which a cooler and a reservoir are connected in a ring at the top are connected via a first auxiliary throttle device and a first on-off valve, and Since the bottom of the rectifier and the cooler are connected via the second sub-throttling device, and the cooler is connected to the suction pipe of the compressor, it flows out of the bottom as a cooling source at the top of the tower. Not only the latent heat of the liquid refrigerant,
The gas phase of the rectifier can be liquefied at a sufficiently low temperature and heat of cooling, and even a non-azeotropic mixed refrigerant with a large difference in boiling point can store a large amount of low-boiling-point components to increase the separation width. it can.

Further, since the amount of refrigerant in the main circuit can be adjusted by controlling the refrigerant in the reservoir to be stored or empty, a wide range of capacity control can be performed by controlling the capacity based on the refrigerant amount and controlling the capacity based on the refrigerant composition. It becomes possible. Also, since the liquid pipe connecting the outdoor main throttle device and the indoor main throttle device and the bottom of the reservoir are connected through the second on-off valve, opening the second on-off valve for a short time Thus, the liquid refrigerant can be stored in the storage device, and the capacity control by adjusting the refrigerant amount can be performed in a short time.

According to a second aspect of the present invention, in the first aspect of the present invention, when a temperature difference between a preset air temperature and a suction air temperature detected by an indoor temperature sensor becomes smaller than a predetermined value. After opening the second on-off valve for a certain period of time while the first on-off valve is closed, the first on-off valve is opened to close the second on-off valve, and the difference between the set air temperature and the suction air temperature. When the temperature difference exceeds a certain value, the first and second on-off valves are controlled so as to be opened. With a simple configuration called valve operation, the amount of refrigerant in the main circuit can be increased or decreased in a short time, and the main circuit composition by rectification separation can be controlled. Capability control can be performed accordingly.

According to a third aspect of the present invention, a non-azeotropic mixed refrigerant is charged, and a compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device that can be fully closed, an indoor main throttle device that can be completely closed, The indoor heat exchanger is connected by piping to form a main circuit of the refrigeration cycle, and the discharge pipe of the compressor and the tower bottom of the rectification separator having a circuit in which a cooler and a reservoir are connected in a ring at the top of the tower are formed. One sub-throttle device and a first on-off valve are connected, the bottom of the rectifying separator and the cooler are also connected via a second sub-throttle device, and a cooler and the compressor are connected. Since it is connected to the suction pipe, the latent heat of the liquid refrigerant flowing out from the bottom of the tower can be used as a cooling source on the top of the tower. It can liquefy the gas phase and has low boiling point components even in non-azeotropic mixed refrigerants with a large boiling point difference. More refrigerant can be a a large separation width and stored. In addition, since the refrigerant in the reservoir can be stored or emptied and the amount of refrigerant in the main circuit can be adjusted, a wide range of capacity control is possible by controlling the amount of refrigerant and controlling the amount of refrigerant by the composition of the refrigerant. . Also, since the liquid pipe connecting the outdoor main throttle device and the indoor main throttle device and the bottom of the reservoir are connected through the second on-off valve, opening the second on-off valve for a short time Thus, the liquid refrigerant can be stored in the storage device, and the capacity control by adjusting the refrigerant amount can be performed in a short time.

Further, since the indoor / outdoor main throttle device that can be fully closed is used, the main throttle device is fully closed to separate the main circuit into a high pressure side and a low pressure side even when the compressor is stopped during the rectification separation operation. Thus, the gas discharged from the compressor can be supplied to the rectifier and the rectification and separation operation can be continued even when the compressor is stopped until the pressure in the main circuit is balanced.

According to a fourth aspect of the present invention, in the third aspect, a temperature difference between a preset air temperature and a suction air temperature detected by an indoor temperature sensor is equal to or less than a predetermined value. In this case, after opening the second on-off valve for a certain period of time while the first on-off valve is closed, open the first on-off valve and close the second on-off valve, and also set the air temperature and suction air temperature. When the temperature difference between the first and second on-off valves becomes equal to or more than a certain value, the first on-off valve and the second on-off valve are controlled to be opened. The simple configuration of the on-off valve operation allows the amount of refrigerant in the main circuit to be increased or decreased in a short time and the main circuit composition to be controlled by rectification and separation. Can be controlled according to the conditions. In addition, if the compressor stops during the rectification separation operation, the separation operation can be continued until the pressure in the main circuit is balanced even if the compressor is stopped by only simple control of fully closing the main throttle device. it can.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a first embodiment of a heat pump device according to the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a system configuration diagram of a second embodiment of the heat pump device according to the present invention.

FIG. 4 is a flowchart showing the operation of the embodiment.

FIG. 5 is a system configuration diagram of a conventional heat pump device.

[Explanation of symbols]

 Reference Signs List 11 compressor 12 four-way valve 13 outdoor heat exchanger 14, 28 outdoor main throttle device 15, 29 indoor main throttle device 16 indoor heat exchanger 17 rectifying separator 18 cooler 19 storage device 20, 22 sub-throttle device 21, 23 On-off valve 24 Indoor unit 25 Temperature sensor 26, 30 Arithmetic unit 27 On-off valve control unit 31 Drive valve control unit

Claims (4)

[Claims] A compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device, an indoor main throttle device, and an indoor heat exchanger are connected to form a main circuit of a refrigeration cycle, and a discharge pipe of the compressor is provided. And a tower bottom of a rectifying separator having a circuit in which a cooler and a reservoir are connected in a ring at the top, via a first auxiliary throttle device and a first on-off valve, and the rectifying separator And the cooler is connected via a second sub-throttling device, the cooler is connected to a suction pipe of the compressor, and the outdoor main throttle device and the indoor main throttle device are further connected. A heat pump device, wherein a pipe connecting the above and a bottom of the reservoir are connected via a second on-off valve, and a non-azeotropic mixed refrigerant is sealed. 2. An indoor temperature sensor for detecting a suction air temperature of an indoor unit having the indoor heat exchanger, wherein a temperature difference between a preset air temperature and a suction air temperature detected by the indoor temperature sensor is constant. When the value becomes equal to or less than the value, after opening the second on-off valve for a certain period of time while the first on-off valve is closed, the first on-off valve is opened and the second on-off valve is closed. The first opening / closing valve and the second opening / closing valve are opened when a temperature difference between the set air temperature and the suction air temperature becomes equal to or more than a predetermined value. Operation control method of the heat pump device. 3. A main circuit of a refrigeration cycle is formed by connecting a compressor, a four-way valve, an outdoor heat exchanger, an outdoor main throttle device that can be fully closed, an indoor main throttle device that can be fully closed, and an indoor heat exchanger. Then, the discharge pipe of the compressor is connected to the tower bottom of a rectifier having a circuit in which a cooler and a reservoir are connected in a ring at the top of the tower via a first auxiliary throttle device and a first on-off valve. Similarly, the bottom of the fractionator and the cooler are connected via a second sub-throttling device, the cooler is connected to the suction pipe of the compressor, and The pipe connecting the possible outdoor main throttle device and the fully-closeable indoor main throttle device and the bottom of the reservoir are connected via a second on-off valve, and the non-azeotropic mixed refrigerant is sealed. Characteristic heat pump device. 4. An indoor temperature sensor for detecting a suction air temperature of an indoor unit having the indoor heat exchanger, wherein a temperature difference between a preset air temperature and a suction air temperature detected by the indoor temperature sensor is constant. When the value becomes equal to or less than the value, after opening the second on-off valve for a certain period of time while the first on-off valve is closed, the first on-off valve is opened and the second on-off valve is closed. When the temperature difference between the set air temperature and the suction air temperature is equal to or more than a certain value, the first on-off valve and the second on-off valve are opened, and the first on-off valve is further opened. The operation of the heat pump device according to claim 3, wherein when the compressor is stopped in a state where the compressor is stopped while the second on-off valve is closed and the second on-off valve is closed, the outdoor main throttle device and the indoor main throttle device are fully closed. Control method.