WO2024019333A1

WO2024019333A1 - Vapor injection heat pump system and operation method thereof

Info

Publication number: WO2024019333A1
Application number: PCT/KR2023/008447
Authority: WO
Inventors: 김윤진; 김성훈; 이해준
Original assignee: 한온시스템 주식회사
Priority date: 2022-07-18
Filing date: 2023-06-19
Publication date: 2024-01-25
Also published as: KR20240010791A

Abstract

Disclosed are a vapor injection heat pump system and an operation method thereof, according to an embodiment. The operation method of the vapor injection heat pump system formed of a compressor, an indoor heat exchanger, a vapor injection module, an outdoor heat exchanger, and an evaporator, comprises a step of performing control in one of a first heating mode that is a non-vapor injection heating mode in which a refrigerant introduced into the vapor injection module flows into the outdoor heat exchanger, and a second heating mode that is a vapor injection heating mode, in which a part of the refrigerant introduced into the vapor module flows into the compressor and the remainder flows into the outdoor exchanger, wherein in the control step, when the first heating mode is changed to the second heating mode or the second heating mode is changed to the first heating mode, the flow of the refrigerant is maintained in the vapor injection module.

Description

Vapor injection heat pump system and its operating method

The embodiment relates to a vapor injection heat pump system and method of operating the same.

Under the trend of environmentally friendly industrial development and the development of energy sources that replace fossil raw materials, the areas that have recently attracted the most attention in the automobile industry are electric vehicles and hybrid vehicles. These electric and hybrid vehicles are equipped with batteries to provide driving power, and the batteries are used not only for driving but also for cooling and heating.

In vehicles that provide driving force using batteries, the fact that the battery is used as a heat source during cooling and heating means that the driving distance is reduced accordingly. To overcome the above problem, a heat pump system, which has been widely used as a home air conditioning and heating system, is used in automobiles. A method of application was proposed.

A heat pump is a device that absorbs heat at low temperatures and moves the absorbed heat to high temperatures. As an example, a heat pump has a cycle in which a liquid refrigerant evaporates in an evaporator, takes heat from the surroundings, becomes a gas, and then liquefies while releasing heat to the surroundings through a condenser. Applying this to an electric vehicle or hybrid vehicle has the advantage of securing a heat source that is insufficient in a conventional air conditioning case.

This heat pump system may operate in a first heating mode and a second heating mode depending on the heating load. At this time, noise may occur due to the refrigerant valve switching, and the abnormal refrigerant at a high flow rate hits the wall of the gas-liquid separator and then rotates the inner wall in the downward direction, increasing vibration in the process of separating the gas phase and the liquid phase.

Embodiments may provide a vapor injection heat pump system and a method of operating the same.

A method of operating a vapor injection heat pump system consisting of a compressor, an indoor heat exchanger, a vapor injection module, an outdoor heat exchanger, and an evaporator according to an embodiment of the present invention is a method of operating a vapor injection heat pump system in which the refrigerant flowing into the vapor injection module flows into the outdoor heat exchanger. It includes a step of being controlled in one of a first heating mode, which is an injection heating mode, and a second heating mode, which is a vapor injection heating mode, in which a part of the refrigerant flowing into the vapor module flows into the compressor and the remainder flows into the outdoor exchanger. And, in the controlled step, when changing from the first heating mode to the second heating mode or from the second heating mode to the first heating mode, the flow of the refrigerant can be maintained in the vapor injection module. there is.

The controlled step may be set so that the start time of the second heating mode is not earlier than the end time of the first heating mode.

In the controlled step, the end time of the first heating mode and the start time of the second heating mode may be set to be the same, or the end time of the first heating mode may be set after the start time of the second heating mode.

When the controlled step is controlled in the second heating mode, the second heating mode is operated for a predetermined time and then changed to the first heating mode, and the starting point of the first heating mode is the second heating mode. It can be set no earlier than the end point of the mode.

In the controlled step, the end time of the first heating mode and the start time of the second heating mode may be set to be the same, or the end time of the second heating mode may be set after the start time of the first heating mode.

The controlled step may be controlled in the first heating mode for a certain period of time and then controlled in the second heating mode according to the pressure difference between the inlet pressure and outlet pressure of the compressor, or may be controlled directly in the second heating mode. there is.

The controlled step is controlled to the second heating mode when the pressure difference between the inlet pressure and the outlet pressure of the compressor exceeds a predetermined reference pressure, and when the pressure difference is less than or equal to the predetermined reference pressure, the second heating mode is controlled. 1 Can be controlled in heating mode.

In the vapor injection heat pump system consisting of a compressor, an indoor heat exchanger, a vapor injection module, an outdoor heat exchanger, an evaporator, and a control device according to an embodiment of the present invention, the vapor injection module is used to cool the refrigerant flowing into the vapor injection module to the outdoor A portion of the refrigerant flowing into the vapor module flows into the compressor and the remainder flows into the outdoor exchanger. The first heating mode is a non-vapor injection heating mode flowing into the heat exchanger. a first expansion means that blocks the flow of the condensed refrigerant or expands and delivers the condensed refrigerant; a gas-liquid separator that separates the refrigerant delivered from the first expansion means into gas phase and liquid phase refrigerant; and a second expansion means for passing or expanding the condensed refrigerant or expanding the liquid refrigerant separated in the gas-liquid separator according to the first heating mode or the second heating mode, and the control device is configured to control the first heating mode. Controlling the first expansion means and the second expansion means according to the heating mode or the second heating mode, changing from the first heating mode to the second heating mode or changing from the second heating mode to the first heating mode When changed to , the flow of the refrigerant can be controlled to be maintained in the vapor injection module.

When switching to the second heating mode after operating in the first heating mode for a predetermined time, the control device sets the control time of the first expansion means and the control time of the second expansion means to be the same, or sets the control time of the first expansion means to be the same or The control time of the first expansion means can be set after the control time of the expansion means.

When switching to the first heating mode after operating in the second heating mode for a predetermined time, the control device sets the control timing of the first expansion means and the control timing of the second expansion means to be the same, or sets the control timing of the first expansion means to be the same, or The control point of the second expansion means can be set after the control point of the first expansion means.

The control device may be controlled in the first heating mode for a certain period of time or directly in the second heating mode depending on the pressure difference between the inlet and outlet pressures of the compressor.

The control device controls the second heating mode when the pressure difference between the inlet pressure and the outlet pressure of the compressor exceeds a predetermined reference pressure, and when the pressure difference is less than the predetermined reference pressure, the first heating mode It can be controlled in heating mode.

According to the embodiment, when changing from the first heating mode to the second heating mode, the first expansion means and the second expansion means in the vapor injection module are opened simultaneously or the first expansion means and the second expansion means are opened sequentially, Instantaneous high pressure generation can be suppressed, thereby improving the safety of the system.

According to the embodiment, noise and vibration caused by switching between the first expansion means and the second expansion means can be reduced.

1 is a diagram showing a vapor injection heat pump system according to an embodiment of the present invention.

FIG. 2 is a diagram showing the detailed configuration of the vapor injection module shown in FIG. 1.

Figure 3 is a diagram showing a method of operating a cooling mode according to an embodiment of the present invention.

Figure 4 is a diagram showing a method of operating a heating mode according to an embodiment of the present invention.

5A to 5B are diagrams for explaining the operating principle of the heating mode.

FIG. 6 is a diagram showing a method of operating the first heating mode shown in FIG. 4.

FIG. 7 is a diagram showing a method of operating the second heating mode shown in FIG. 4.

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

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining and replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B and C”, it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to that other component, but also is connected to that component. It can also include cases where other components are 'connected', 'combined', or 'connected' due to another component between them.

Additionally, when described as being formed or disposed “above” or “below” each component, “above” or “below” refers not only to cases where two components are in direct contact with each other, but also to one This also includes cases where another component described above is formed or placed between two components. In addition, when expressed as “top (above) or bottom (bottom)”, it can include not only the upward direction but also the downward direction based on one component.

Figure 1 is a diagram showing a vapor injection heat pump system according to an embodiment of the present invention, and Figure 2 is a diagram showing the detailed configuration of the vapor injection module shown in Figure 1.

Referring to Figures 1 and 2, the vapor injection heat pump system according to an embodiment of the present invention includes a vapor injection module (1), a compressor (10), an indoor heat exchanger (20), a condenser (30), and an outdoor heat exchanger ( 40), a third expansion means 50, an evaporator 60, a fourth expansion means 70, a chiller 80, an accumulator 90, and a control device 2.

The compressor 10 is driven by receiving power from an engine (internal combustion engine) or a motor, sucks and compresses the refrigerant, and then discharges it to the condenser 30 in a high-temperature, high-pressure gaseous state.

The condenser 30 functions as a condenser 30 in both the cooling mode and the heating mode. The condenser 30 can condense the compressed refrigerant. The refrigerant condensed in the condenser 30 moves along the first line 100 and is supplied to the vapor injection module 1.

The vapor injection module 1 includes a first line 100, a second line 200, a third line 300, a gas-liquid separator 400, a first expansion means 500, and a second expansion means 600. It can be included.

The first line 100 may be connected to the inlet 110 through which the refrigerant flows, providing a passage through which the refrigerant flows into the vapor injection module 1. For example, the first line 100 may have a circular pipe structure, and various pipe structures for moving the refrigerant may be used.

The gas-liquid separator 400 can receive refrigerant from the first expansion means 500 and separate it into gas phase and liquid phase refrigerant. The gas-liquid separator 400 can move the separated gaseous refrigerant to the compressor 10 and move the liquid refrigerant to the third line 300.

The gas-liquid separator 400 may include a housing 410, an outflow passage 420, and a movement passage 430.

The housing 410 provides an internal space through which refrigerant flows. The housing 410 has a cylindrical structure, and the inner wall may have an inclination. This slope has a radius that decreases toward the bottom, providing the effect of flow rate correction. An outlet is disposed at the top of the housing 410, and a movement passage 430 may be formed at the bottom of the housing 410.

An outlet passage 420 is connected to the outlet, and gaseous refrigerant can move to the outlet through the outlet passage 420.

A second line 200 is connected to an upper area of the housing 410, and the second line 200 is arranged to discharge the refrigerant toward the side wall of the housing 410 to form a return flow. The refrigerant discharged from the second line 200 descends while circling the side wall of the outflow passage 420.

The moving passage 430 provides a passage through which the liquefied refrigerant in the housing 410 moves toward the second expansion means 600 disposed in the third line 300. A partition 440 may be disposed on one side of the moving passage 430 to prevent the refrigerant from scattering.

The partition 440 may be located in the center of the movement passage 430, that is, at the lower part of the outflow passage 420, and can prevent the refrigerant moving through this passage from scattering and flowing into the outflow passage 420. . For example, the partition wall portion 440 may have a circular plate structure and may have a diameter larger than the diameter of the outflow passage 420. The shape of the partition 440 is not limited, but is preferably formed larger than the cross-section of the outflow passage 420, and may be modified in various ways depending on the cross-sectional shape of the outflow passage 420.

Additionally, a fixing part may be connected to the partition wall part 440 and fixed to the housing 410. For example, the fixing part may have a bar structure, and one side may be connected to the partition 440 and the other side may be fixed to the housing 410.

One side of the second line 200 may be connected to the first line 100, and the other side may be connected to an upper area of the gas-liquid separator 400. The second line 200 provides a passage through which refrigerant moves, and a first expansion means 500 may be disposed in one area of the second line 200.

The first expansion means 500 may block the flow of condensed refrigerant, or expand the condensed refrigerant and deliver it to the gas-liquid separator 400, depending on the air conditioning mode. The first expansion means 500 may include a first ball valve 510 that is disposed at the center of the second line 200 and rotates. The first ball valve 510 may include a first inlet hole 511 and a first expansion groove 513 connected to the first inlet hole 511.

The refrigerant flowing into the first expansion means 500 moves through the first inlet hole 511 formed in the first ball valve 510, and expands while passing through the first expansion groove 513 to form the gas-liquid separator 400. ) can flow into the

The first expansion means 500 may be a 2-way expansion valve.

A driving part is connected to the first ball valve 510 and can rotate, and the refrigerant moving to the second line 200 can be moved or blocked through rotation of the first ball valve 510.

The third line 300 may be connected to the first line 100 and an area below the gas-liquid separator 400 to provide a passage through which refrigerant can move. One side of the third line 300 is connected to the first line 100, and the other side is connected to the movement passage 430 of the gas-liquid separator 400 so that the refrigerant can move.

The second expansion means 600 may pass or expand the condensed refrigerant or expand the liquid refrigerant separated in the gas-liquid separator 400, depending on the air conditioning mode.

The second expansion means 600 is disposed on the third line 300 and controls the movement direction and expansion of the liquid refrigerant flowing through the first line 100 or separated from the gas-liquid separator 400. You can. When the first expansion means 500 blocks the flow of the condensed refrigerant, the second expansion means 600 may pass through or expand the condensed refrigerant.

The second expansion means 600 may be a 3/2-way expansion valve. The 3/2-way expansion valve can control the direction of movement, expansion, and flow rate of the incoming refrigerant.

The second expansion means 600 includes a second inlet hole 611, a second outlet hole 613 connected to the second inlet hole 611, and a second expansion groove formed on one side of the second outlet hole 613. It may include a second ball valve 610 having (613a).

The second ball valve 610 is provided in a spherical shape and can be connected to a driving unit (not shown) to rotate. The second ball valve 610 may be disposed inside the second expansion means 600.

The second ball valve 610 may have a second inlet hole 611 and a second outlet hole 613 connected to form a passage through which refrigerant moves. For example, the second inlet hole 611 and the second outlet hole 613 may be connected to have an angle of 90 degrees. However, the angles of the second inlet hole 611 and the second outlet hole 613 are not limited and may be modified to various angles.

The second expansion groove 613a is connected to the end of the second outlet hole 613 to expand and move the refrigerant moving through the second outlet hole 613. In one embodiment, the second expansion groove 613a is provided in an elongated shape and can expand the refrigerant using pressure changes of the moving refrigerant.

The second ball valve 610 operates to move or expand the refrigerant. The second ball valve 610 may operate to move or expand the refrigerant by changing the positions of the second inlet hole 611, the second outlet hole 613, and the second expansion groove 613a through rotation. .

The first expansion means 500 and the second expansion means 600 are electronic expansion valves, which, although not indicated by reference numerals, are equipped with an actuator (motor) for rotating each ball valve, and are adjusted according to the rotation angle of the actuator. Accordingly, the expansion amount or refrigerant flow amount can be controlled.

The indoor heat exchanger 20 can heat the room by exchanging heat with air conditioning wind using the heat of the refrigerant flowing in from the compressor 10. The indoor heat exchanger 20 is disposed inside the air conditioning case C of the vehicle together with the evaporator 60, which will be described later, to heat the interior of the vehicle.

The outdoor heat exchanger 40 is an air-cooled heat exchanger along with a radiator and is installed on the front side of the vehicle engine room, and is arranged in a straight line in the direction of flow of air blown from the blower fan. Additionally, the outdoor heat exchanger 40 can exchange heat with low-temperature coolant discharged from the radiator.

Additionally, the outdoor heat exchanger 40 may perform different roles depending on the air conditioning mode. In the cooling mode, the outdoor heat exchanger 40 functions as a condenser 30, which is the same as the water-cooled condenser 30, and in the heating mode, it functions as an evaporator 60, which is opposite to the water-cooled condenser 30.

The third expansion means 50 is disposed on the inlet side of the evaporator 60 and can perform the functions of expansion, flow control, and opening and closing of the refrigerant.

The evaporator 60 is installed inside the air conditioning case (C), is placed in the refrigerant circulation line, and is supplied with the low-temperature, low-pressure refrigerant discharged from the third expansion means (50), and is supplied to the inside of the air conditioning case (C) through a blower. As the air flowing through passes through the evaporator 60, it exchanges heat with the low-temperature, low-pressure refrigerant inside the evaporator 60 and turns into cold air, which is then discharged into the vehicle interior to cool the interior of the vehicle. That is, the evaporator 60 functions as an evaporator 60 on the refrigerant circulation line.

The fourth expansion means 70 is connected in parallel with the third expansion means 50 and can perform the functions of expansion, flow control, and opening and closing of the circulating refrigerant.

The chiller 80 may be supplied with the low-temperature, low-pressure refrigerant discharged from the fourth expansion means 70 and exchange heat with the coolant moving through the coolant circulation line. Meanwhile, the cold coolant heat-exchanged in the chiller 80 may circulate through the coolant circulation line and exchange heat with the high-temperature battery.

The accumulator 90 is installed on the refrigerant circulation line at the inlet side of the compressor 10, where the refrigerant that has passed through the evaporator 60 and/or the chiller 80 joins, and separates the liquid refrigerant and the gaseous refrigerant to produce the gaseous refrigerant. Only the refrigerant is supplied to the compressor 10, and excess refrigerant can be stored.

The suction port of the compressor 10 is connected to the gaseous refrigerant outlet of the accumulator 90, and through this, it is possible to prevent liquid refrigerant from being sucked into the compressor 10.

The control device 2 can control the cooling mode and heating mode by controlling the vapor injection module 1. The heating mode may include a first heating mode that is a non-vapor injection heating mode and a second heating mode that is a vapor injection heating mode.

In the cooling mode, the control device 2 closes the first expansion means 500 of the vapor injection module to block the flow of condensed refrigerant, and opens the second expansion means 600 to allow the condensed refrigerant to pass. .

The control device 2 may be controlled or driven in the first heating mode or the second heating mode based on the pressure difference between the first pressure, which is the inlet pressure of the compressor, and the second pressure, which is the outlet pressure.

As an example, the control device 2 may be driven in the first heating mode when the pressure difference between the first pressure and the second pressure exceeds a predetermined reference pressure.

In the first heating mode, the control device 2 closes the first expansion means 500 to block the condensed refrigerant, and opens the second expansion means 600 to expand the condensed refrigerant.

And after the first heating mode is operated for a certain period of time, it may be changed to the second heating mode. At this time, so that the flow of refrigerant in the vapor injection module is maintained without being blocked, the end time of the first heating mode and the start time of the second heating mode are set to be the same, or the end time of the first heating mode is set after the start time of the second heating mode. can be set.

As another example, the control device 2 may be driven in the second heating mode when the pressure difference between the first pressure and the second pressure is less than or equal to a predetermined reference pressure.

In the second heating mode, the control device 2 may open the first expansion means 500 to expand the condensed refrigerant and open the second expansion means 600 to expand the condensed refrigerant. After the second heating mode is operated for a certain period of time, it can be changed to the first heating mode.

And after the second heating mode is operated for a certain period of time, it may be changed to the first heating mode. At this time, the end time of the first heating mode and the start time of the second heating mode may be set to be the same, or the end time of the second heating mode may be set after the start time of the first heating mode.

Referring to FIG. 3, when operating in the cooling mode, the first expansion valve of the vapor injection module is closed to block the flow of condensed refrigerant (S310), and the second expansion valve is opened to allow the condensed refrigerant to pass (S320). ). That is, when the refrigerant flows in through the inlet 110, the movement of the refrigerant in the second line 200 connected to the first line 100 is blocked by the first expansion means 500.

The refrigerant whose movement to the second line 200 is blocked by the first expansion means 500 moves to the third line 300, and the second expansion means 600 moves through the third line 300. The incoming refrigerant can be bypassed and moved to the refrigerant outlet.

Figure 4 is a diagram showing a method of operating a heating mode according to an embodiment of the present invention, Figures 5A to 5B are diagrams for explaining the operating principle of the heating mode, and Figure 6 is a diagram showing the first heating mode shown in Figure 4. It is a diagram showing an operation method, and FIG. 7 is a diagram showing the second heating mode operation method shown in FIG. 4.

Referring to FIGS. 4 to 7, the vapor injection heat pump system (hereinafter referred to as the heat pump system) according to an embodiment of the present invention uses the first pressure, which is the inlet side pressure of the compressor, when the heating mode is driven according to the user's operation. The pressure and the second pressure, which is the outlet pressure, can be measured (S410).

The heat pump system may calculate a pressure difference between the first pressure and the second pressure (S420) and compare the calculated pressure difference with a predetermined reference pressure (S430). For example, the reference pressure may be set to 2 bar, but is not necessarily limited to this.

If the calculated pressure difference is greater than a predetermined reference pressure, the heat pump system may be driven in the first heating mode (S440).

When operating the first heating mode as shown in FIGS. 5A and 6, the first expansion means 500 of the heat pump system blocks the condensed refrigerant, and the second expansion means 600 expands the condensed refrigerant. there is.

In the case of the first heating mode, when the refrigerant flows in through the inlet 110, the second line 200 connected to the first line 100 is blocked from moving the refrigerant by the first expansion means 500. moves to the third line 300.

The second ball valve 610 of the second expansion means 600 blocks the refrigerant from flowing into the third line 300 from the gas-liquid separator 400, and the third line connected to the first line 100 ( 300) can be operated to allow refrigerant to flow in. The refrigerant flowing into the second ball valve 610 may be expanded to low pressure through the second expansion groove 613a and then flow out.

The heat pump system may be driven in the second heating mode by operating the first heating mode for a predetermined time and then changing to the second heating mode (S450). For example, the predetermined time may be set to 60 seconds, but is not necessarily limited thereto.

The reason why the heating mode is operated for a predetermined time in the first heating mode and then changed to the second heating mode and operated in the second heating mode is to prevent liquid refrigerant from flowing into the suction port of the initial compressor. .

When changing to the second heating mode as shown in FIGS. 5B and 6, the first expansion means 500 expands the condensed refrigerant, and the gas-liquid separator 400 separates the expanded refrigerant into gas phase and liquid phase, and then the gas phase is It is delivered to the compressor and the liquid phase is transferred to the second expansion means 600, and the second expansion means 600 can expand the condensed refrigerant.

In the case of the second heating mode, when the refrigerant flows in through the inlet 110, the first expansion means 500 is opened and the refrigerant flows in, and the inflow refrigerant expands to medium pressure in the first expansion means 500 to become a gas-liquid. flows into the separator 400. The first expansion means 500 expands the incoming refrigerant to medium pressure to reduce the load on the compressor and increase heat exchange efficiency in the evaporator.

The refrigerant flowing into the gas-liquid separator 400 circulates and descends along the side wall of the housing 410 of the gas-liquid separator 400, and the liquid refrigerant separated from the gas-liquid separator 400 flows through the connection passage to the third line (300). ), and the separated gaseous refrigerant can be discharged through the outflow passage 420.

The second ball valve 610 of the second expansion means 600 blocks the refrigerant from flowing from the first line 100 to the third line 300, and the third line connected to the gas-liquid separator 400 ( 300) can be operated to allow refrigerant to flow in. The refrigerant flowing into the second ball valve 610 may be expanded to low pressure through the second expansion groove 613a and then flow out.

In this way, efficiency can be increased by adjusting the expansion pressure of the refrigerant as it sequentially passes through the first expansion means 500 and the second expansion means 600 in the second heating mode.

At this time, when changing from the first heating mode to the second heating mode, the second expansion means 600 may be opened before the first expansion means 500, and a momentary blocked section may occur. At this time, the high pressure suddenly increases. There are concerns that it will rise.

Therefore, in order to solve this problem, in the embodiment, the first expansion means 500 and the second expansion means 600 are opened simultaneously by setting the control point at the same time, or the second expansion means 500 is opened after the control point of the first expansion means 500. The control point of the means 600 can be set and opened sequentially. Through this method, the second expansion means 600 is not opened before the first expansion means 500.

On the other hand, if the calculated pressure difference is smaller than the predetermined reference pressure, the heat pump system can immediately operate the second heating mode as shown in FIG. 7 (S450).

In the second heating mode, the first expansion means 500 and the second expansion means 600 may be opened simultaneously or the first expansion means 500 and the second expansion means 600 may be opened sequentially.

Meanwhile, here, the case of changing from the first heating mode to the second heating mode is described as an example, but it is not necessarily limited to this and the second heating mode may be changed from the first heating mode.

When changing from the second heating mode to the first heating mode, in the first heating mode, the first expansion means is closed and the second expansion means is open, so there may be a case where the first expansion means closes first and the refrigerant cannot flow momentarily. there is.

Therefore, in order to solve this problem, in the embodiment, the control timing of the first expansion means 500 and the second expansion means 600 are set to be the same and open simultaneously, or the first expansion means is performed after the control timing of the second expansion means 600. The control point of the means 500 can be set and opened sequentially. In this way, the first expansion means 500 is closed after the second expansion means 600 is opened.

The term '~unit' used in this embodiment refers to software or hardware components such as FPGA (field-programmable gate array) or ASIC, and the '~unit' performs certain roles. However, '~part' is not limited to software or hardware. The '~ part' may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors. Therefore, as an example, '~ part' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or may be further separated into additional components and 'parts'. Additionally, components and 'parts' may be implemented to regenerate one or more CPUs within a device or a secure multimedia card.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

Claims

In the operating method of a vapor injection heat pump system consisting of a compressor, an indoor heat exchanger, a vapor injection module, an outdoor heat exchanger, and an evaporator,

A first heating mode, which is a non-vapor injection heating mode in which the refrigerant flowing into the vapor injection module flows into the outdoor heat exchanger, and a portion of the refrigerant flowing into the vapor module flows into the compressor and the remainder flows into the outdoor exchanger. A step controlled by one of a second heating mode that is a vapor injection heating mode,

The controlled steps are,

Operation of a vapor injection heat pump system in which the flow of the refrigerant is maintained in the vapor injection module when changing from the first heating mode to the second heating mode or from the second heating mode to the first heating mode. method.
According to paragraph 1,

The controlled steps are,

A method of operating a vapor injection heat pump system, wherein the start time of the second heating mode is set no earlier than the end time of the first heating mode.
According to paragraph 1,

The controlled steps are,

Operation of a vapor injection heat pump system in which the end time of the first heating mode and the start time of the second heating mode are set to be the same or the end time of the first heating mode is set after the start time of the second heating mode. method.
According to paragraph 1,

The controlled steps are,

When controlled in the second heating mode, the second heating mode is operated for a predetermined time and then changed to the first heating mode,

A method of operating a vapor injection heat pump system, wherein the start time of the first heating mode is set no earlier than the end time of the second heating mode.
According to paragraph 3,

The controlled steps are,

Operation of a vapor injection heat pump system in which the end time of the first heating mode and the start time of the second heating mode are set to be the same or the end time of the second heating mode is set after the start time of the first heating mode. method.
According to paragraph 1,

The controlled steps are,

A vapor injection heat pump system that is controlled in the first heating mode for a certain period of time and then controlled in the second heating mode, or directly controlled in the second heating mode, depending on the pressure difference between the inlet pressure and the outlet pressure of the compressor. operating method.
According to clause 6,

The controlled steps are,

Controlled to the second heating mode when the pressure difference between the inlet pressure and the outlet pressure of the compressor exceeds a predetermined reference pressure,

When the pressure difference is less than or equal to the predetermined reference pressure, the method of operating a vapor injection heat pump system is controlled in the first heating mode.
In the vapor injection heat pump system consisting of a compressor, indoor heat exchanger, vapor injection module, outdoor heat exchanger, evaporator, and control device, the vapor injection module is

A first heating mode, which is a non-vapor injection heating mode in which the refrigerant introduced into the vapor injection module flows into the outdoor heat exchanger, or a portion of the refrigerant introduced into the vapor module flows into the compressor and the remainder flows into the outdoor heat exchanger. a first expansion means that blocks the flow of condensed refrigerant or expands and delivers the condensed refrigerant according to the second heating mode, which is an injection heating mode;

a gas-liquid separator that separates the refrigerant delivered from the first expansion means into gas phase and liquid phase refrigerant; and

It includes a second expansion means for passing or expanding the condensed refrigerant according to the first heating mode or the second heating mode or expanding the liquid refrigerant separated in the gas-liquid separator,

The control device is,

Controlling the first expansion means and the second expansion means according to the first heating mode or the second heating mode,

A vapor injection heat pump system that controls the flow of the refrigerant to be maintained in the vapor injection module when changing from the first heating mode to the second heating mode or from the second heating mode to the first heating mode. .
According to clause 8,

The control device is,

When changing to the second heating mode after operating in the first heating mode for a predetermined time, the control time of the first expansion means and the control time of the second expansion means are set to be the same, or the control time of the second expansion means is set to be the same. A vapor injection heat pump system that sets the control point of the first expansion means after the point in time.
According to clause 8,

The control device is,

When changing to the first heating mode after operating in the second heating mode for a predetermined time, the control timing of the first expansion means and the control timing of the second expansion means are set to be the same, or the control timing of the first expansion means is set to be the same. A vapor injection heat pump system that sets the control point of the second expansion means after the control point.
According to clause 8,

The control device is,

A vapor injection heat pump system that is controlled for a certain period of time in the first heating mode or directly controlled in the second heating mode depending on the pressure difference between the inlet pressure and the outlet pressure of the compressor.
According to clause 11,

The control device is,

Controlling to the second heating mode when the pressure difference between the inlet pressure and the outlet pressure of the compressor exceeds a predetermined reference pressure,

When the pressure difference is less than or equal to the predetermined reference pressure, the vapor injection heat pump system is controlled to the first heating mode.