KR101350611B1 - Heat pump system that use duality compression type - Google Patents

Abstract

A heating and cooling heat pump using a dual refrigerant cycle and a single stage refrigerant cycle is disclosed. The disclosed heating pump includes a low temperature side refrigeration cycle and a high temperature side refrigeration cycle, a cascade heat exchanger serving as a condenser of the low temperature side refrigeration cycle and a condenser of the high temperature side refrigeration cycle, the low temperature side refrigeration cycle, or the high temperature side refrigeration cycle. It includes a heat storage tank unit for storing hot water or cold water produced by the heating operation, during the heating operation, the hot water refrigeration cycle and the low temperature side refrigeration cycle to produce hot water in a two-way refrigeration cycle that receives heat from the cascade heat exchanger, and cooling In operation, it is characterized in that the cold water is produced by heat exchange in multiple stages by operating in separate single stage cycles without heat exchange between the high temperature side refrigeration cycle and the low temperature side refrigeration cycle.

Description

Heating and cooling heat pump using dual refrigerant cycle and single stage refrigerant cycle {Heat pump system that use duality compression type}

The present invention relates to a heating and cooling heat pump, and more particularly, in a cold season, heating is performed by producing hot water through a dual refrigerant cycle, and in the summer, a cooling and heating heat capable of performing cooling in a multistage compression method through a single stage refrigerant cycle. It is about a pump.

In general, the heat pump consists of a compressor, a condenser, an expansion valve, and an evaporator to perform cooling and heating through a refrigeration cycle. As the refrigerant boils in the evaporator, heat is absorbed from the outside, and the boiled refrigerant gas is compressed into a gas of high temperature and high pressure by a compressor and sent to the condenser. The high pressure refrigerant gas is condensed and condensed to a liquid state of low temperature and high pressure by releasing heat from the condenser. Condensed refrigerant is throttled and expanded through an expansion valve, and some refrigerant liquid evaporates and absorbs latent heat. Through the coolant liquid becomes a state of coexistence of the liquid phase and the gaseous phase of colder low pressure and colder to boil through the evaporator. As described above, the refrigerating cycle has a portion for absorbing heat and a portion for dissipating heat, and may simultaneously perform cooling and heating by absorbing heat from the evaporator and transferring heat to the condenser.

In general, the binary refrigeration cycle is divided into a low temperature side using a low temperature refrigerant boiling at -52 ° C and a high temperature side using a high temperature refrigerant boiling at relatively -11 ° C or more. Evaporation of the high-temperature side refrigerant and condensation of the low-side side refrigerant in one cascade heat exchanger is effective in producing hot water because the refrigerant discharge gas temperature on the high side can be maintained at a high temperature even when the outside air temperature is low in winter. The heat pump is a device composed of two parts such a low temperature side and a high temperature side and used for cooling and heating and hot water supply. The heat pump is a cooling and heating device that transfers a low temperature heat source to a high temperature or a high temperature heat source to a low temperature by using heat of a refrigerant or heat of condensation.

Korean Patent No. 859311 discloses a heat pump of the prior art, which is composed of a low temperature side and a high temperature side, and is utilized for cooling and heating and hot water supply. In the conventional heat pump apparatus disclosed in the patent, in the simultaneous production mode of cold hot water, the high temperature side condenser produces hot water by exchanging heat with the water in the hot water tank, and the refrigerant passing through the high temperature side condenser lowers the expansion temperature while passing through the auxiliary heat exchanger. .

However, in the above-described conventional heat pump, the refrigerant on the low temperature side is heat-exchanged with the water in the cold water tank in the low temperature side evaporator to produce cold water, and then passes through the low temperature side evaporation / condenser (external air heat exchanger: acting as a condenser in cooling or defrost mode). Since it is immediately recovered by the low temperature compressor, there is a problem that the low temperature side cycle becomes unstable due to the lack of refrigerant and the efficiency is lowered.

In addition, in the summer cold water production mode, the heat transfer cycle is not driven, only the heat acquisition cycle is driven, and thus there is a problem in that a separate cooler is operated due to insufficient cooling heat storage amount.

It is an object of the present invention to smoothly produce high-temperature water using a cascade heat exchanger in winter, and to cool in multiple stages while operating single-stage cycles on the hot side and the low-temperature side separately in summer, thereby improving the cooling efficiency. It is to provide a cooling and heating heat pump using a refrigerant cycle.

Another object of the present invention is to provide a cooling / heating heat pump using a dual refrigerant cycle and a single stage refrigerant cycle in which a shortage of refrigerant is eliminated to stabilize a cycle and improve performance.

In addition, another object of the present invention is to ensure the stable production of hot water by raising the evaporation amount and the temperature of the refrigerant sucked into the low temperature compressor of the low temperature side refrigeration cycle during the cold weather in winter, and fear of overcooling and overheating of the low temperature side compressor during the fall season. It is to provide a cooling and heating heat pump using a low dual refrigerant cycle and a single stage refrigerant cycle.

The heating and cooling heating pump of the present invention, a low temperature side refrigeration cycle and a high temperature side refrigeration cycle, a cascade heat exchanger that serves as the evaporator of the low temperature side refrigeration cycle and the condenser of the high temperature side refrigeration cycle, the low temperature side refrigeration cycle or the high temperature side It includes a heat storage tank unit for storing hot water or cold water produced by a refrigeration cycle, and during the heating operation, the hot water refrigeration cycle and the cold side refrigeration cycle heats each other in the cascade heat exchanger to produce hot water In the cooling operation, cold water is produced by performing heat exchange in multiple stages by operating in separate single stage cycles without heat exchange between the high temperature side refrigeration cycle and the low temperature side refrigeration cycle.

According to an embodiment of the present invention, the high temperature side refrigeration cycle, a high temperature compressor for compressing the first refrigerant, an oil separator connected to the outlet of the high temperature compressor, and the outlet of the oil separator is connected to the first refrigerant A four-way valve, a condenser having one side connected to the outlet of the oil separator, a cooling expansion valve connected to the outlet side of the condenser, and a outlet connected to the outlet side of the oil separator and the cooling expansion valve. A first heat exchanger, a first receiver and a heating expansion valve installed between an inlet of the cascade heat exchanger and an outlet of the first heat exchanger, a liquid separator and a high temperature suction filter connected to an inlet side of the high temperature compressor, and the first One side is connected to the heat exchanger outlet and the other side is connected to the inlet of the high temperature suction filter to include a second receiver for replenishing or storing the first refrigerant.

The low temperature side refrigeration cycle may include a low temperature compressor for compressing a second refrigerant, an oil separator connected to an outlet of the low temperature compressor, four sides connected to an outlet of the oil separator, and an outlet of the cascade heat exchanger. A second heat exchanger, a cooling expansion valve connected to one side of the second heat exchanger to expand the second refrigerant, a cycle heat exchanger for exchanging heat between the second refrigerants, and between the four sides and the heating expansion valve And a third heat exchanger that serves as a condenser when cooling and an evaporator when heating, a liquid separator and a low temperature suction filter connected to an inlet of the low temperature compressor, and between the cooling expansion valve and the cycle heat exchanger. One side is connected to the third receiver installed and the outlet of the second heat exchanger or the outlet of the cascade heat exchanger and the cold suction The other side is connected to the filter inlet includes a fourth receiver for replenishing or storing the second refrigerant.

The first and second heat exchangers and the cycle heat exchanger may be plate heat exchangers, and the condenser of the high temperature side refrigeration cycle and the third heat exchanger of the low temperature side refrigeration cycle may be an outdoor air heat exchanger or a plate heat exchanger. Can be.

In addition, according to an embodiment of the present invention, the heat storage tank unit, a heat storage tank for storing cold water or hot water, a diffuser installed in the heat storage tank, and connected to the diffuser and penetrates the first heat exchanger and the second heat exchanger And a circulation pipe and a circulation motor installed in the circulation pipe, wherein the water stored in the heat storage tank is circulated through the circulation pipe to receive or lose heat from the first and second heat exchangers, thereby producing hot or cold water.

In the heating pump of the present embodiment, the cascade heat exchanger condition is the temperature of the image even when the outside air temperature is -15 ° C to -20 ° C in winter due to the high temperature condensation of the low temperature side refrigeration cycle and the evaporation of the high temperature side refrigeration cycle in the cascade heat exchanger in the heating operation mode. The conditions allow for high calorific value in the hot side refrigeration cycle, and it is always possible to produce hot water of 70-80 degrees Celsius. In addition, when the temperature of the second refrigerant that has undergone condensation in the low temperature side refrigeration cycle is high, additional heat transfer is possible in the second heat exchanger, thereby improving hot water production efficiency.

In addition, since the heat pump according to the present embodiment undergoes two stages of cooling in the first and second heat exchangers during the cooling operation, the amount of cooling heat storage can be sufficiently accumulated and the heat storage efficiency is improved.

In addition, in the present embodiment, since the excess and shortage of the first and second refrigerants are measured in real time in the high temperature side refrigeration cycle and the low temperature side refrigeration cycle, it is controlled to replenish or reduce the refrigerant to an appropriate amount. There is no unstable phenomenon and no phenomenon such as over compression or overheating occurs. In addition, by eliminating the excessive shortage of the refrigerant, the possibility of defrost occurs when defrosting the third heat exchanger installed in the outdoor side of the low temperature in winter, the effect of reducing the hot water production due to defrost during defrost mode operation This can be solved and the defrost time can be shortened.

In addition, the heating pump according to the embodiment of the present invention, during the cold season of less than -15 ℃ in winter, operating the low-temperature compressor to condense toward the cascade heat exchanger to the remaining heat (that is, about 30% of fresh gas) and the low-temperature compressor intake pipe and heat In exchange, the suction temperature of the compressor and the amount of evaporation of the refrigerant can be increased. Therefore, it is possible to discharge a certain amount of heat of the low-temperature compressor, and the heat exchange with the high-temperature side refrigeration cycle is smooth, so that no hot water is produced. In addition, when the temperature of the second refrigerant sucked into the low temperature compressor is 15 ° C. or more in the spring and autumn seasons of about 10 ° C., the cold refrigerant remaining after evaporation is bypassed to the suction pipe to control the supercooling and overheating of the low temperature compressor. . Accordingly, it is possible to solve the problems of the prior art such as damage to the low temperature compressor without overloading the low temperature compressor.

1 is a system diagram of a heating and cooling heat pump according to an embodiment of the present invention.
2 is a schematic diagram illustrating a process in which the low temperature and high temperature side refrigeration cycles are operated as a binary refrigeration cycle during heating (when producing hot water).
3 is a schematic diagram illustrating a multi-stage cooling process of a so-called single stage refrigeration cycle in which the hot and cold side refrigeration cycles at the time of cooling (cold water production) are operated separately to take heat from the water stored in the heat storage tank twice.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In describing the drawings, like reference numerals refer to like elements.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the terms "comprise" or "consisting" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of features or numbers, steps, operations, components, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a system diagram of a cooling and heating heat pump 90 according to an embodiment of the present invention.

In the heating and cooling heating pump according to an embodiment of the present invention, referring to FIG. 1, the high temperature side refrigeration cycle 100 may include a low temperature side refrigeration cycle, a high temperature side refrigeration cycle, a low temperature side refrigeration cycle, and a high temperature side refrigeration cycle. A cascade heat exchanger serving as a condenser of a cycle, and a heat storage tank unit for storing and circulating hot water or cold water produced by a low temperature side refrigeration cycle or a high temperature side refrigeration cycle.

1 to 3, the high temperature side refrigeration cycle 100, a high temperature compressor 26 for compressing the first refrigerant, an oil separator 8 connected to the outlet of the high temperature compressor 26, and an oil separator ( 8 is connected to the outlet of 8) to direct the first refrigerant to the condenser 23 or the first heat exchanger 19 (four way valve) 13, one side is connected to the outlet of the oil separator (8) The condenser 23, the cooling expansion valve 10 connected to the outlet side of the condenser 23, and the first heat exchanger 19 connected to the outlet side of the oil separator 8 and the cooling expansion valve 10 during heating operation. And the first receiver 3 and the heating expansion valve 14 provided between the inlet of the cascade heat exchanger 16 and the outlet of the first heat exchanger 19, and the inlet side of the high temperature compressor 26. One side is connected to the liquid separator 4 and the high temperature suction filter 17 and the outlet of the first heat exchanger 19 and the other side is connected to the inlet of the high temperature suction filter 17 to refill the first refrigerant. The loading device is a second receiver 24, a bidirectional filter drier 38 connected to the outlet of the condenser, and first and second solenoid valves 18, 25 provided at the inlet and outlet of the second receiver 24, respectively. ), The third solenoid valve 9 provided in parallel with the cooling expansion valve 10, the fourth solenoid valve 12 provided at the outlet of the cascade heat exchanger 16, and the cascade heat exchanger 16 in parallel. And a fifth solenoid valve 11 provided, and a liquid level gauge 40 indicating the amount of the first refrigerant.

1 to 3, the low temperature side refrigeration cycle 200 includes a low temperature compressor 27 for compressing a second refrigerant, an oil separator 1 connected to an outlet of the low temperature compressor 27, and an oil separator. Four sides 29 connected to the outlet of (1), a second heat exchanger 36 connected to the outlet of the cascade heat exchanger 16, and one side of the second heat exchanger 36 is connected to the second refrigerant It is installed between the cooling expansion valve 34 to expand, the cycle heat exchanger 33 for exchanging heat between the second refrigerant in the low temperature side refrigeration cycle, and the four sides 29 and the heating expansion valve 30. A third heat exchanger 31 which serves as a condenser during cooling, and an evaporator when heating, a liquid separator 6 and a low temperature suction filter 28 connected to the inlet of the low temperature compressor 27, and a cooling expansion The third receiver 5 installed between the valve 34 and the cycle heat exchanger 33 and the outlet or cascade row of the second heat exchanger 36. One side is connected to the outlet of the ventilation 16, the other side is connected to the inlet of the low temperature suction filter 28, the fourth receiver 21 for replenishing or storing the second refrigerant, and the heating expansion valve 30 and the cycle A bidirectional filter drier 2 installed between the heat exchanger 33, a liquid level meter 39 connected to one side of the cycle heat exchanger 33, and a sixth end disposed at both ends of the inlet and outlet of the fourth receiver 21. And a seven solenoid valve 20, 22, a reverse valve 35 connected to the second heat exchanger 36, and an eighth solenoid valve 7 provided in parallel with the second heat exchanger 36.

In the present embodiment, the first and second heat exchangers 19 and 36 and the cycle heat exchanger 33 are configured as plate heat exchangers, and the third heat exchanger 31, the condenser 23 of the high temperature side refrigeration cycle, and the low temperature side. It consists of an outdoor air heat exchanger or a plate heat exchanger of a refrigeration cycle.

The cascade heat exchanger 16 serves as a condenser of the low temperature side refrigeration cycle 200 at the same time as the evaporator of the high temperature side refrigeration cycle 100 during the heating operation, but does not play any role during the cooling operation. The first and second refrigerant lines pass through the cascade heat exchanger 16.

The heat storage tank unit 71 is connected to a heat storage tank 45 for storing cold water or hot water, a diffuser 46 installed inside the heat storage tank 45, a diffuser 46, and a first heat exchanger 19 and the second heat exchanger. The circulation pipe 53 penetrates the heat exchanger 36, and the circulation motors 15 and 37 provided in the circulation pipe 53 are included. Water stored in the heat storage tank 45 is circulated through the circulation pipe 53 to receive or deprive heat from the first and second heat exchangers 19 and 36 to produce hot or cold water.

Hereinafter, referring to FIGS. 2 and 3, the operation process of the dual refrigeration cycle during heating (when producing hot water) and the high temperature and low temperature side refrigeration cycles (100,200) during cooling (when producing cold water) are operated two times. The operation of the multi-stage cooling of the so-called single stage refrigeration cycle that takes heat from the water stored in the heat storage tank 45 will be described in detail.

[Heating operation mode (hot water production mode)]

2 is a schematic diagram illustrating a process of operating the low-temperature and high-temperature side refrigeration cycles 200 and 100 as a dual refrigeration cycle during heating (when producing hot water).

In the production of hot water for heating, the low temperature side refrigeration cycle 200 compresses the second refrigerant at a high temperature and high pressure in the low temperature compressor 27, and heats the compressed second refrigerant through the oil separator 1 on all sides (29). Heat radiation from the cascade heat exchanger (16) to the high temperature side refrigeration cycle through). After the heat dissipation process, condensation and the remaining heat is measured by the temperature sensor 72, the second temperature is higher than 30 degrees Celsius Sent to heat exchanger (36). Heat is transferred from the second heat exchanger 36 to the water through the circulation pipe 53 and the temperature of the second refrigerant is lowered. The second refrigerant passing through the second heat exchanger 36 passes through the reverse side 35 and passes through the third receiver 5, and then is sent to the cycle heat exchanger 33. When the temperature of the second refrigerant is lower than 30 degrees Celsius or less, the eighth solenoid valve 7 is opened to allow the second refrigerant to flow into the cycle heat exchanger 33, and the pipe 61 on the inlet side of the low temperature compressor 27 After exchanging heat and passing through the heating expansion valve (30) through the two-way dryer (2) and after the heat exchange with the outside air in the third heat exchanger (31). After that, the second refrigerant is heat-exchanged in the cycle heat exchanger 33 through the four sides 29, and then sucked into the low temperature compressor 27 through the low pressure filter 28 and the liquid separator 6, and is compressed to high temperature and high pressure again. . The liquid level meter 39 represents the amount of the second refrigerant. At this time, the amount of the second refrigerant flowing into the low temperature compressor 27 is measured by the low pressure sensor 52 in real time, and if the amount of the second refrigerant flowing into the low temperature compressor 27 is small, it passes through the bypass refrigerant pipe 62. Open the installed sixth solenoid valve 20. When the sixth solenoid valve 20 is opened, the refrigerant in the fourth receiver 21 is replenished to the low-temperature compressor 27 inlet pipe 61 through the bypass refrigerant pipe 62. The solenoid valve 22 is opened, and the 2nd refrigerant | coolant is removed from the pipe | pipe downstream of the 8th solenoid valve 7 with the 4th receiver 21, and is stored in the 4th receiver 21. As shown in FIG.

The high temperature side refrigeration cycle 200 compresses the first refrigerant at a high temperature and high pressure in the high temperature compressor 26, passes through the oil separator 8, and passes through the four sides 13 to the third solenoid valve 9. Pass through the first heat exchanger 19 (the third solenoid valve is open at the time of heating). The first heat exchanger 19 supplies heat to the circulation pipe 53 of the heat storage unit 71 to produce hot water. The first refrigerant passing through the first heat exchanger 19 is expanded through the first receiver 3 to the heating expansion valve 14 and then heat exchanged in the cascade heat exchanger 16. The cascade heat exchanger 16 condenses on the low temperature side and evaporates on the high temperature side, and separates the liquid from the liquid separator 4 via the liquid level gauge 40 and the high temperature suction filter 17 through the fourth solenoid valve 12. And then suctioned into the high temperature compressor (when heating, the fourth solenoid valve 12 is opened and the fifth solenoid valve 11 is closed). If the suction amount of the first refrigerant sucked into the high temperature compressor 26 is small, the first solenoid valve 18 is opened to replenish the refrigerant in the second receiver 24 with the piping at the inlet side of the high temperature compressor. If the amount is large, the second solenoid valve 25 is opened to store the first refrigerant in the second receiver 24. The amount of the first refrigerant is measured in real time by the low pressure sensor 51 provided in the high temperature compressor inlet pipe. In the heating mode, the circulation motor 37 at the lower end of the heat storage tank is operated so that the water stored in the heat storage tank passes through the second heat exchanger 36 and passes through the first heat exchanger 19 and is then sent to the heat storage tank again.

The heating pump 90 of the present embodiment, which is operated as described above in the heating operation mode, is winter outside temperature due to the high temperature condensation of the low temperature side refrigeration cycle 200 and the evaporation of the high temperature side refrigeration cycle 100 in the cascade heat exchanger 16. In the case of -15 ℃ ~ -20 ℃ cascade heat exchanger 16 conditions can be a temperature condition of the image, it can produce high heat in the high temperature side refrigeration cycle 100, and always produces hot water of 70-80 degrees Celsius It is possible.

In addition, since the high temperature side refrigeration cycle 100 and the low temperature side refrigeration cycle 200 are controlled to measure the real shortage of the first and second refrigerants in real time and then replenish the refrigerant or reduce it to an appropriate amount. There is no cycle instability, no over-compression or overheating, and the cycle can be operated stably.

In addition, in the present embodiment, when the temperature of the second refrigerant that has undergone condensation in the low temperature side refrigeration cycle 200 is 30 degrees Celsius or more, the second heat exchanger 36 transfers heat to the circulation pipe 53 once again. Process improves hot water production efficiency.

[Cooling operation mode (cold water production mode)]

Figure 3 shows the operation of the multi-stage cooling of the so-called single stage refrigeration cycle in which the hot and cold side refrigeration cycles (100,200) during cooling (when cold water is produced) are operated separately to take heat from the water stored in the heat storage tank (45) twice. This is a schematic diagram to explain.

In the cooling operation mode, the heating pump 90 of the present embodiment operates the high temperature side refrigeration cycle 100 and the low temperature side refrigeration cycle 200 in a single cycle without passing through the cascade heat exchanger 16, respectively. In the multi-stage heat exchange method, the first heat exchanger 19 lowers the water temperature of the heat storage tank 45 and the second heat exchanger 36 of the low temperature side refrigeration cycle 200 lowers the water temperature. Therefore, a sufficient amount of heat in the heat storage tank 45 can be secured.

In the case of the high temperature side refrigeration cycle 100, when cooling, the 3rd and 4th solenoid valves 9 and 12 are closed, and the 5th solenoid valve 11 is opened. The hot gas compressed by the high temperature compressor (26) passes through the oil separator (8), exchanges heat with outside air from the four sides (13) through the condenser (23), and then passes through the bidirectional filter drier (38) and again the four sides ( 13) is expanded in the cooling expansion valve 10, and then heat exchanged with water in the first heat exchanger 19 to primarily lower the temperature of the water. After the heat exchange with water, the first refrigerant passes through the level gauge 40 through the fifth solenoid valve 11, passes through the high temperature suction filter 17, separates the liquid from the liquid separator 4, and then the high temperature compressor 26. Is sucked into. At this time, if the first refrigerant is insufficient, the first solenoid valve 18 is opened to supplement the refrigerant stored in the second receiver 24 with the high temperature compressor suction pipe, and if the first refrigerant is large, the second solenoid valve 25 is replaced. The first refrigerant is removed from the first heat exchanger 19 outlet pipe and stored in the second receiver 24. Real-time measurement and control of the amount of refrigerant with the low pressure sensor 51 is the same as described in the heating mode.

During the cooling operation of the low temperature side refrigeration cycle 200, the hot gas compressed by the high temperature compressor 27 passes through the oil separator 1 and heat exchanges through the third heat exchanger 31 at the four sides 29 to condense (condensation). After passing through the reverse direction 32, the bidirectional filter drier 2 is used to exchange heat with the low temperature compressor suction side pipe 61 in the cycle heat exchanger 33. The second refrigerant then passes through the liquid level meter 39, expands through the third receiver 5, in the cooling expansion valve 34, and passes through the cascade heat exchanger 16 after heat exchange in the second heat exchanger 36. The water is subsequently cooled. After the heat exchange, the second refrigerant is sucked into the low temperature compressor 27 after separating the liquid from the liquid separator 6 through the low pressure filter 28 after the heat exchange through the four sides 29 through the cycle heat exchanger 33. The low pressure sensor 52 measures the amount of the second refrigerant in real time. If the second refrigerant is insufficient, the sixth solenoid valve 20 installed in the bypass refrigerant pipe is opened to cool the refrigerant in the fourth receiver 21 to the low temperature compressor ( Refilling with the suction side pipe 61 of 27), if the amount of the second refrigerant is large, the seventh solenoid valve 22 is opened to store the second refrigerant in the fourth receiver 21. During the cooling operation, the circulation motor 15 at the upper end of the heat storage tank 45 is operated so that the water in the heat storage tank 45 is first cooled by the first heat exchanger 19 and then secondarily by the second heat exchanger 36. After further cooling to the storage tank 45 is sent.

As described above, since the heat pump 90 of the present embodiment undergoes two stages of cooling in the first and second heat exchangers 19 and 36 during the cooling operation, the heat storage 90 is sufficiently accumulated. It has the advantage that the heat storage efficiency can be improved.

In addition, by installing the cycle heat exchanger 33 in the low temperature side refrigeration cycle 200 to improve the temperature of the low temperature compressor 27 suction side second refrigerant, the load of the low temperature compressor 27 is reduced, Replenishment ensures stable operation.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1,8 oil separator 2: two-way filter drier
3, 24, 5, 21: first to fourth receiver 4, 6: liquid separator
5: 3rd receiver 10,34: cooling expansion valve
13,29: Four sides 14, 30: Heating expansion valve
16: Cascade heat exchanger 17: High temperature suction filter
19: 1st heat exchanger 23: condenser
31: third heat exchanger 33: cycle heat exchanger
36: second heat exchanger 39, 40: liquid level meter
45: heat storage tank 46: diffuser

Claims (7)

Low temperature side refrigeration cycle and high temperature side refrigeration cycle;
A cascade heat exchanger serving as an evaporator of the low temperature side refrigeration cycle and a condenser of the high temperature side refrigeration cycle;
And a heat storage tank unit configured to store hot water or cold water produced by the low temperature side refrigeration cycle or the high temperature side refrigeration cycle.
During the heating operation, the high temperature side refrigeration cycle and the low temperature side refrigeration cycle produce hot water in a two-way refrigeration cycle to exchange heat with the cascade heat exchanger,
In cooling operation, cold water is produced by heat exchange in multiple stages by operating in separate single-stage cycles without heat exchange between the high temperature side refrigeration cycle and the low temperature side refrigeration cycle,
The high temperature side refrigeration cycle,
A high temperature compressor for compressing a first refrigerant, an oil separator connected to an outlet of the high temperature compressor, a four way valve connected to an outlet of the oil separator to induce the first refrigerant, and an outlet of the oil separator A condenser connected at one side thereof, a cooling expansion valve connected to an outlet side of the condenser, a first heat exchanger connected to the oil separator and an outlet side of the cooling expansion valve, an inlet of the cascade heat exchanger and the first heat exchanger A first receiver and a heating expansion valve installed between the outlets of the outlet, a liquid separator and a high temperature suction filter connected to the inlet side of the high temperature compressor, and a side of the first heat exchanger outlet connected to the inlet of the high temperature suction filter; Cooling and heating the heating pump, characterized in that the side connected to include a second receiver for replenishing or storing the first refrigerant. delete The method of claim 1, wherein the high temperature side refrigeration cycle,
A bidirectional filter drier connected to the outlet of the condenser, first and second solenoid valves provided at inlets and outlets of the second receiver, a third solenoid valve installed in parallel with the cooling expansion valve, and the cascade heat exchanger. And a fourth solenoid valve installed at an outlet of the machine and a fifth solenoid valve installed in parallel with the cascade heat exchanger. The method of claim 1, wherein the low temperature side refrigeration cycle,
A low temperature compressor for compressing a second refrigerant, an oil separator connected to an outlet of the low temperature compressor, a four-sided side connected to an outlet of the oil separator, a second heat exchanger connected to an outlet of the cascade heat exchanger, and the second heat exchanger A cooling expansion valve connected to one side of the unit to expand the second refrigerant, a cycle heat exchanger for exchanging heat between the second refrigerants, and installed between the four sides and the heating expansion valve to cool the condenser. And a third heat exchanger serving as an evaporator during heating, a liquid separator and a low temperature suction filter connected to the inlet of the low temperature compressor, a third receiver installed between the cooling expansion valve and the cycle heat exchanger, and the third heat exchanger. 2 One side is connected to the heat exchanger outlet or the outlet of the cascade heat exchanger and the other side is connected to the inlet of the low temperature suction filter. Air heating pump, characterized in that comprising a fourth fluid to supplement or storing the second refrigerant. The method of claim 4, wherein the low temperature side refrigeration cycle,
A bidirectional filter drier installed between the heating expansion valve and the cycle heat exchanger, a liquid level meter connected at one side to the cycle heat exchanger, sixth and seventh solenoid valves installed at both ends of the inlet and the outlet of the fourth receiver, And an eighth solenoid valve installed in parallel with the second heat exchanger and the second heat exchanger. 5. The method of claim 4,
The first and second heat exchangers, the cycle heat exchanger is composed of a plate heat exchanger,
And the third heat exchanger of the condenser of the high temperature side refrigeration cycle and the third heat exchanger of the low temperature side refrigeration cycle comprise an outdoor air heat exchanger or a plate heat exchanger. The heat storage tank unit according to claim 1, 3 or 4,
A heat storage tank for storing cold water or hot water,
A diffuser installed inside the heat storage tank,
A circulation pipe connected to the diffuser and penetrating the first heat exchanger and the second heat exchanger;
It includes a circulation motor installed in the circulation pipe,
The water stored in the heat storage tank is circulated through the circulation pipe while being supplied with or deprived of heat from the first and second heat exchangers to produce hot or cold water.

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