KR101811762B1 - Heat Pump For a Vehicle - Google Patents

Abstract

The present invention relates to a heat pump for a vehicle and, specifically, to a heat pump for a vehicle, formed as a dual loop including a refrigerant loop and a coolant loop and performing cooling/heating/defrosting/dehumidification operation by being interworked with each other as the dual loop. According to an embodiment of the present invention, the heat pump for a vehicle comprises: a first fluid line in which a first fluid flows; a compressor compressing and discharging the first fluid; an inner heat exchanger exchanging the heat of the first fluid with the heat of air in a vehicle; an outer heat exchanger exchanging the heat of the outer air with the heat of the first fluid; a first expansion unit installed on the first fluid line between the inner heat exchanger and the outer heat exchanger and installed to expand the first fluid; a second expansion unit installed on the first fluid line and installed to expand the first fluid passing through the outer heat exchanger; an accumulator enabling a gas refrigerant among the gas refrigerant and a liquid refrigerant on the first fluid line passing through the second expansion unit to flow into the compressor; a third heat exchanger installed on the first fluid line between the second expansion unit and the accumulator and heat-exchanging with a second fluid; and a second fluid line connected to the third heat exchanger.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat pump for a vehicle,

The present invention relates to a heat pump for an automobile, and more particularly, to a heat pump for an automobile which is composed of a double loop including a coolant loop and a cooling water loop, and which performs a cooling / heating / defrost / The invention.

In recent years, along with the demand for improvement of the global environment and the atmospheric environment, the demand for introduction of automobiles or low pollution vehicles powered by alternative energy sources is increasing.

As an alternative energy vehicle, a hybrid vehicle that uses an electric motor and an engine as an electric vehicle or a driving source is attracting attention.

In a general internal combustion engine using gasoline or diesel as a raw material, heating operation can be performed by using a heat source from an internal combustion engine. However, in the case of an electric vehicle, since the engine or the cooling water is not provided as a heating source, There is a technical difficulty in that the driving distance of the vehicle is drastically reduced when the battery is heated. Even in a hybrid vehicle, there is a motor driving mode in which the engine is stopped and driven only by an electric motor. In this section, the vehicle needs to run only with the capacity of the battery, so that a sufficient heat source can not be secured as in an electric vehicle. As a result, if an air conditioner installed in an automobile using an ordinary engine is applied to an electric vehicle and a hybrid vehicle, there arises a problem that the heat source at the time of heating operation and the driving force of the compressor at the time of cooling operation are not sufficiently provided.

In order to overcome the limitations of the conventional heating and cooling apparatus, it is necessary to heat and heat the electric vehicle or the hybrid vehicle in such a case. As one of the measures to overcome the problem, the heat pump, A method of applying the proposed method is proposed.

A heat pump refers to absorbing low temperature heat and moving the absorbed heat to high temperature. In one example, the heat pump has a cycle in which the liquid refrigerant evaporates in the evaporator, takes heat away from the evaporator, becomes a gas, and is again liquefied while releasing heat to the surroundings by the condenser. When this is applied to an electric vehicle or a hybrid vehicle, there is an advantage that a heat source insufficient for a conventional air conditioner can be secured.

Of course, there have been attempts to apply heat pumps to automobiles.

Korean Patent Laid-Open Publication No. 10-2000-0063254 discloses a heat pump comprising: a hot water heater as a heat pump which is installed on the downstream side of an air circulation unit and circulates cooling water of an engine; an air heater provided on the upstream side of the air circulation unit, A first bypass line for bypassing the refrigerant discharged from the compressor in the heating operation, and a second bypass line provided outside the air circulation unit for discharging the refrigerant discharged from the hot water heater A first electronic expansion valve disposed at a refrigerant inlet side of the indoor heat exchanger and a second electronic expansion valve disposed at a refrigerant inlet side of the dual pipe heat exchanger, Discloses a heat pump having an expansion valve and control means for controlling the opening degree of the first electronic expansion valve and the second electronic expansion valve It was.

In addition, Korean Patent Registration No. 10-1669826 discloses a refrigerant circulation system including a compressor installed on a refrigerant circulation line for compressing and discharging a refrigerant, and a heat exchanger installed inside the air conditioner case for exchanging heat between the air in the air conditioner case and the refrigerant discharged from the compressor An outdoor heat exchanger installed inside the air conditioner case for exchanging heat between the air in the air conditioner case and the refrigerant supplied to the compressor; an outdoor heat exchanger installed outside the air conditioner case for exchanging heat between the refrigerant circulating through the refrigerant circulation line and the outside air; A first expansion means provided on a refrigerant circulation line between the indoor heat exchanger and the outdoor heat exchanger for expanding the refrigerant; a second expansion means provided on the refrigerant circulation line at the inlet side of the evaporator for expanding the refrigerant; , And an inlet-side refrigerant circulation line of the second expansion means and an outlet-side refrigerant circulation line of the evaporator And a bypass line through which the refrigerant bypasses the second expansion means and the evaporator in the heat pump mode, wherein the refrigerant circulation line is provided with a bypass line for performing a dehumidification in the passenger compartment And a dehumidifying line for supplying a part of the refrigerant circulating in the refrigerant circulation line to the evaporator side is provided, wherein the dehumidifying line connects the outlet refrigerant circulation line of the first expansion means and the inlet refrigerant circulation line of the evaporator And a portion of the refrigerant passing through the first expansion means and before entering the outdoor heat exchanger is provided to the evaporator side.

According to these prior art vehicle heat pumps, it is possible to optimally control cooling and heating, and also to perform a dehumidifying operation smoothly in a vehicle interior. However, all of these inventions have various modes such as cooling / heating / Many bypass lines and valves are configured for operation to form a very complex system. Furthermore, in an environment where the outside air temperature is extremely low (for example, during winter), the external heat exchanger can be easily conceived. In order to remove the external heat exchanger, a complicated refrigerant defrost loop including a bypass line is used to remove the refrigerant.

When a large number of bypass lines and valves are constructed as in the prior art, the assembling and manufacturing processes of the heat pump system are complicated and the pressure drop of the refrigerant increases along the complicated line, There arises a problem that the refrigerant loop control for each operating mode becomes complicated. There is controversy as to whether the advantages of the heat pump system can be overcome due to the complexity of the control and the increase of the cost.

As long as there is a limitation on the battery for a vehicle, it is obvious that a conventional air conditioner should be modified or an air conditioner of a new concept should be developed.

There is a need to develop a new air conditioner suitable for electric cars or hybrid cars in keeping with the development of alternative energy, which is a trend of the times.

In addition, there is also a need to easily configure the air conditioning system to keep pace with the trend of downsizing and compacting of automobile equipment and components in order to improve the fuel efficiency of automobiles.

In order to meet such a demand, the present invention eliminates unnecessary bypass lines as an embodiment of the present invention, thereby avoiding the structural and control complexity of the conventional heat pump system. Thereby providing a heat pump system constituting a loop.

According to an embodiment of the present invention for solving the above-mentioned problems, there is provided a fluid supply device comprising: a first fluid line through which a first fluid flows; A compressor for compressing and discharging the first fluid; An internal heat exchanger for heat-exchanging the first fluid with air in the passenger compartment; An external heat exchanger for heat-exchanging the first fluid with outside air; First expansion means disposed on a first fluid line between the internal heat exchanger and the external heat exchanger, the first expansion means being arranged to expand the first fluid; A second expansion means disposed on the first fluid line, the second expansion means being arranged to expand the first fluid passing through the external heat exchanger; An accumulator for introducing gaseous refrigerant in the liquid phase and gaseous phase refrigerant on the first fluid line passing through the second expansion means into the compressor; A third heat exchanger disposed on the first fluid line between the second expansion means and the accumulator, the third heat exchanger being heat exchangeable with the second fluid; And a second fluid line connected to the third heat exchanger, wherein the second fluid line is disposed inside the air conditioning case and serves as an evaporator when cooling or dehumidifying-heating, Wherein the heat exchanger is connected to a cabin cooler that exchanges heat with air in the heat exchanger.

According to one embodiment, the heat pump is used in an electric vehicle or a hybrid vehicle.

According to one embodiment, the first fluid may be a refrigerant, and the second fluid may be a cooling water.

According to an embodiment, the second fluid line may be connected to a cabin cooler for heat-exchanging with air in the vehicle room, and an electric and / or thermal waste heat recovering unit for heat-exchanging with electrical equipment, respectively.

According to one embodiment, the second fluid line may include a first opening / closing valve for opening / closing the flow to the cabin cooler and a second opening / closing valve for opening / closing the flow to the electric waste heat recovering unit.

According to an embodiment, the second fluid line recovers electric waste heat at the time of heating and transfers heat to the third heat exchanger.

According to an embodiment of the present invention, when the second fluid line requires more heat than the heating, the heat recovery unit recovers both the total waste heat and the cabin waste heat to transfer heat to the third heat exchanger.

Further, the heat pump system according to an embodiment of the present invention may further include a direction switching valve for switching a flow direction of the first fluid discharged from the compressor.

On the other hand, in the present invention, a compressor, a directional switching valve, an internal heat exchanger, a first expansion means, an external heat exchanger, a second expansion means, a third heat exchanger, and an accumulator are sequentially arranged on a first fluid line through which a first fluid flows And a second open / close valve and a cabin cooler are disposed in a first branch line of a second fluid line through which the second fluid flows, and a second open / close valve and an electric waste heat recovering section are disposed in a second branch line. wherein the cabin cooler is located inside the air conditioner case and is operated to serve as an evaporator when cooling or dehumidifying-heating, and the flow of the first fluid and the second fluid is linked to each other And a cooling / heating operation is performed.

Here, the method of operating a heat pump according to an embodiment of the present invention is a cooling operation method, wherein the first fluid is introduced into a compressor, a first expansion means, an external heat exchanger, a second expansion means, a third heat exchanger, an accumulator, The first expansion means is fully opened, and the second fluid can pass through the third heat exchanger, the cabin cooler, and the third heat exchanger in this order.

In the heating operation method, the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, And the second fluid may be passed through the third heat exchanger, the electric field heat recovery unit, and the third heat exchanger in this order.

In the defrosting operation method, the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, And the second fluid may be passed through the third heat exchanger, the electric field heat recovery unit, and the third heat exchanger in this order.

As a heating-dehumidifying operation method, the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, And the second fluid may be passed through the third heat exchanger, the cabin cooler, and the third heat exchanger in this order.

In the present invention, the invention has been proposed in which the bypass line of the heat pump system is minimized.

In the conventional heat pump system, the assembling and manufacturing processes are complicated for driving the heat pump mode, the pressure drop of the refrigerant is increased, and the refrigerant loop control for each operation mode is difficult. In particular, when the outside air temperature is low, frost is conceived in the external heat exchanger. In the conventional heat pump system, the defrosting operation is performed by using a complicated refrigerant loop in order to remove the frost. For example, in the conventional technology, the refrigerant at mid-high temperature and high pressure passing through the internal heat exchanger flows through the expansion valve and the bypass line by the chiller (third heat exchanger) without passing through the external heat exchanger.

However, the present invention proposes a heat pump system that is shorter in length than a conventional heat pump system and has a shorter refrigerant loop length, and is superior to the prior art in terms of defrost efficiency. It has a technical advantage of reducing the cost because the bypass line is omitted and the cost is reduced and the refrigerant loop length is short so that the pressure drop amount is reduced and the internal heat exchanger is circulated to the external heat exchanger The defrost performance is improved and the defrosting time can be shortened. In addition, it has an advantage that the heating performance is prevented from being reduced during the defrosting operation.

From the control point of view, the present invention is a dual loop system, so temperature control can be individually performed for each loop, which is advantageous in terms of system stability. In the case of a system failure diagnosis, There are advantages.

FIG. 1 is a view showing a circulation path of a coolant and a cooling water in a cooling operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention.
FIG. 2 is a view showing a circulation path of a coolant and a cooling water in a heating operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention.
FIG. 3 is a view showing a circulation path of a coolant and a coolant in a defrost operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention.
FIG. 4 is a view showing a circulation path of a refrigerant and a cooling water in a heating-dehumidifying operation mode in a construction of a heat pump system having a double loop according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an automotive heat pump according to the present invention will be described in detail with reference to the accompanying drawings. The embodiments are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

The expression "including" any element is merely referred to as being an "open" expression and should not be understood as excluding the additional elements.

Further, when a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it should be understood that there may be other components in between.

Also, the expressions such as 'first, second', etc. are used only to distinguish a plurality of configurations, and do not limit the order or other features between configurations.

1 to 4, an automotive heat pump system and a heat pump operation method according to the present invention will be described.

FIG. 1 is a view showing a circulation path of a coolant and a cooling water in a cooling operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention. FIG. 2 is a view showing a circulation path of a coolant and a cooling water in a heating operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention. FIG. 3 is a view showing a circulation path of a coolant and a coolant in a defrost operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention. FIG. 4 is a view showing a refrigerant and a cooling water circulation path in the dehumidification-heating operation mode in the construction of a heat pump system having a double loop according to an embodiment of the present invention.

First, the structure of a heat pump for a vehicle according to an embodiment of the present invention is as follows. And consists of two loops as a whole, the configurations on the first fluid line through which the first fluid flows and the configurations on the second fluid line through which the second fluid flows. When the automobile of the present invention is an electric vehicle, the first fluid and the second fluid may preferably mean different refrigerants. In the case of a hybrid vehicle, the first fluid may be a refrigerant and the second fluid may be a refrigerant other than the first fluid. Or cooling water. More preferably, the first fluid may be a refrigerant provided for air conditioning of a passenger compartment, and the second fluid may be a cooling water line flowing into a vehicle through a water pump.

The heat pump system of the present invention may be applied to an electric vehicle that does not have an internal combustion engine using fossil fuel but that is driven only by a battery and a hybrid vehicle that is equipped with an internal combustion engine and a battery. According to an embodiment of the present invention, when the heat pump system of the present invention is applied to the electric vehicle, a cooling water line for cooling the engine is not separately provided. Therefore, the second fluid is preferably a refrigerant other than cooling water.

More specifically, an automotive heat pump according to an embodiment of the present invention includes: a first fluid line through which a first fluid flows; A compressor (COMP) for compressing and discharging the first fluid; An internal heat exchanger (110) for heat-exchanging the first fluid with air in the passenger compartment; An external heat exchanger (120) for heat-exchanging the first fluid with outside air; A first expansion means (220) disposed on a first fluid line between the internal heat exchanger (110) and the external heat exchanger (120), the first expansion means (220) being arranged to expand the first fluid; A second expansion means (230) disposed on the first fluid line, the second expansion means being arranged to expand the first fluid passing through the external heat exchanger (120); An accumulator (ACC) for introducing gaseous refrigerant in the liquid phase and gaseous phase refrigerant on the first fluid line passing through the second expansion means (230) into the compressor; A third heat exchanger (130) disposed on the first fluid line between the second expansion means (230) and the accumulator (ACC), the third heat exchanger being heat exchangeable with the second fluid; And a second fluid line connected to the third heat exchanger 130 to form a secondary-loop.

The second fluid line may be connected to a cabin cooler 140 that performs heat exchange with air in the vehicle room and may be connected to an electrical and thermal waste heat recovery unit 150 that performs heat exchange with electrical equipment, Closing valve 250 for opening / closing the flow to the electric waste heat recovering unit 150 and the first opening / closing valve 240 for opening / closing the flow to / from the electric waste heat recovery unit 150.

In addition, the heat pump of the present invention may further include a direction switching valve 210 for switching the flow direction of the first fluid discharged from the compressor COMP.

1, a compressor (COMP), a directional control valve 210, an internal heat exchanger 110, a first expansion device 220, an external heat exchanger 120, a second expansion device 230, A first fluid part 131 and an accumulator ACC of the third heat exchanger 130 and a second fluid part 132 of the third heat exchanger 130, A first open / close valve 240, a cabin cooler 140, a second open / close valve 250, and a total waste heat recovery unit 150.

The directional valve 210 provided on the first fluid line may supply the first fluid discharged from the compressor COMP to the internal heat exchanger 110 or the external heat exchanger 110 without passing through the internal heat exchanger 110, And is directly supplied to the heat exchanger 120. For this purpose, the directional control valve 210 may be a 3-way valve. When the directional control valve 210 is a 3-way valve, the operation of supplying the first fluid to the external heat exchanger 120 and the operation of supplying the first fluid to the internal heat exchanger 110 may be selectively performed.

A pressure sensor (not shown) is mounted on the first fluid line connecting the compressor COMP and the directional valve 210 to sense the pressure of the refrigerant discharged from the compressor COMP in a compressed state . The first fluid flowing on the first fluid line flows in one direction without any other path change other than the flow path change by the directional control valve 210. [

The first expansion means 220 and the second expansion means 230 according to an embodiment of the present invention may be an electronic expansion means selectively formed to be capable of fully opening the refrigerant line. The opening amount of the refrigerant line can be freely adjusted according to the input of the user or the controller. Unlike the mechanical expansion means in which the amount of opening is determined according to the piping shape and the pressure of the refrigerant line can not be freely adjusted.

The cabin cooler 140 and the electric waste heat recovering unit 150 provided on the second fluid line are arranged in parallel and are selectively opened and closed by the first opening and closing valve 240 and the second opening and closing valve 250, 2 fluid can selectively flow to the cabin cooler 140 and the total area waste heat recovering unit 150 side. However, in some cases, the first opening / closing valve 240 and the second opening / closing valve 250 may be opened at the same time, and the second fluid may flow simultaneously to the cabin cooler 140 and the total area waste heat recovering unit 150. That is, the temperature of the second fluid can be changed by selectively using the waste heat source generated from the electric component. The electric component connected to the electric component waste heat recovery unit 150 may mean a product that can generate heat such as a motor M, an inverter, a converter, a battery, and the like.

The third heat exchanger 130 may be divided into a first fluid-side part 131 and a second fluid-side part 132. The third heat exchanger 130 receives two different fluids and transmits thermal energy of the respective fluids. Since no separate heat providing means is connected to the third heat exchanger 130, the third heat exchanger 130 Heat will be transferred from a fluid with a hotter temperature to a fluid with a colder temperature. The fluid flowing in the third heat exchanger 130 is configured not to be mixed with each other. For this purpose, the shape of the third heat exchanger 130 is preferably formed like a chiller widely used as a cooler.

The second fluid line serves to cool the inside of the vehicle by moving the heat of the hot second fluid to the first fluid side relatively cool through the third heat exchanger 130 during cooling, thereby cooling the cabin cooler 140 side, And collects the waste heat of the electric system at the time of heating to transfer the heat to the first fluid side through the third heat exchanger 130. At the time of the advanced heating, the heat of the electric waste heat and the cabin is recovered together and the third heat exchanger 130 ) To the user.

Hereinafter, the operation method of the automotive heat pump of the present invention will be described in more detail.

According to the operation method of the automotive heat pump of the present invention, the compressor (COMP), the directional control valve (210), the internal heat exchanger (110), the first expansion means (220) The first fluid line is disposed in the first branch line of the second fluid line in which the second fluid is flowing and the second fluid line is connected to the second fluid line. Loop type automobile in which a first on-off valve 240 and a cabin cooler 140 are disposed and a second on-off valve 250 and an electric waste heat recovering portion 150 are disposed on a second branch line, The method of operating the heat pump is characterized by selectively performing the cooling, heating, defrosting or heating-dehumidifying operation by connecting the flows of the first fluid and the second fluid to each other.

The cooling mode, the heating mode, the defrost mode, the dehumidification-heating mode on / off, the switching and the temperature control of the present invention can be automatically adjusted and operated by the user's selection or the controller of the vehicle. Here, the controller may mean a conventional VCU (Vehicle Control Unit) provided in the vehicle.

The controller senses the pressure information of the first fluid received through the pressure sensor (not shown), the pressure information of the second fluid, the temperature of the first fluid and the second fluid received through the temperature sensor (not shown) The valves are driven to operate the compressors to adjust the opening of each of the expansion means and the opening / closing valve. In addition, the controller may control the flow rate of the water pump according to the air-conditioning mode of the vehicle and the temperature state of the electrical waste heat source, or may control the airflow of the opening / closing door and the blowing fan.

First, referring to Fig. 1, the cooling operation mode will be described.

As the cooling operation method, the first fluid is supplied to the compressor (COMP), the first expansion means 220, the external heat exchanger 120, the second expansion means 230, the third heat exchanger 130, the accumulator (ACC) The first expansion means 220 is fully opened and the second fluid is introduced into the third heat exchanger 130 and the cabin cooler 140 again in the third heat exchanger 130. [ (130) in this order.

Here, the path of the directional control valve 210 to the internal heat exchanger 110 side is closed and only the path directly connected to the external heat exchanger 120 side is opened. Accordingly, the high-temperature, high-pressure, and gaseous first fluid discharged from the compressor (COMP) flows directly to the external heat exchanger (120) through the first expansion means (220).

At this time, the first expansion means 220 is fully opened to minimize the pressure drop and the state change of the first fluid. Accordingly, the high-temperature, high-pressure, and gaseous first fluid discharged from the compressor COMP passes through the first expansion means 220 as it is, and is then condensed while being exchanged with the cool outside air by the external heat exchanger 120, The first fluid in the gas phase is converted into the first fluid in the liquid phase.

Subsequently, the first fluid having passed through the external heat exchanger 120 is decompressed and expanded in the process of passing through the second expansion means 230 to become a low-temperature, low-pressure liquid first fluid, and then flows into the third heat exchanger 130 .

The low-temperature low-pressure liquid phase first fluid introduced into the third heat exchanger 130 can heat-exchange with the second fluid on the second fluid line. At this time, the first fluid in the third heat exchanger 130 evaporates while exchanging heat with the second fluid, and at the same time, the second fluid is cooled by an endothermic effect due to the latent heat of vaporization, (140), and the cooling air is cooled by cooling the air supplied by the blowing fan (11). In this process, the door 12 closes the air flow on the side of the internal heat exchanger 110, flows into the air conditioner case, and then meets the cabin cooler 140 and discharges the cooled air directly into the passenger compartment.

Thereafter, the first fluid, which has passed through the third heat exchanger 130 and is mixed with the low-temperature and low-pressure gaseous and liquid phases, passes through the accumulator and flows back to the compressor COMP to circulate the cycle. The accumulator ACC separates the liquid refrigerant and the gaseous refrigerant from the refrigerant supplied to the compressor COMP so that only the gaseous refrigerant can be supplied to the compressor COMP.

That is, in the cooling mode, the first fluid passes through the first expansion means 220 as it is discharged from the compressor, the first expansion means 220 is condensed in the external heat exchanger 120, the second expansion means 230 is decompressed, And evaporating in the third heat exchanger 130. The second fluid cools the inside of the vehicle by contacting with the air in a state in which heat is taken by the first fluid.

Referring to Fig. 2, the heating operation mode will be described.

As the heating operation method, the first fluid is supplied to the compressor (COMP), the internal heat exchanger 110, the first expansion device 220, the external heat exchanger 120, the second expansion device 230, the third heat exchanger 130 ), The accumulator (ACC), and the compressor (COMP), the second expansion means (230) is fully opened and the second fluid is introduced into the third heat exchanger (130) The first heat exchanger 150, and the third heat exchanger 130 in this order.

Here, the path of the directional control valve 210 to the internal heat exchanger 110 side is opened and the path directly connected to the external heat exchanger 120 side is closed. Therefore, the high temperature, high pressure, and gaseous first fluid discharged from the compressor flows into the internal heat exchanger 110 side.

The first fluid of high temperature, high pressure and gaseous phase introduced into the internal heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case through the blowing fan 11 to convert the gaseous first fluid into a liquid first fluid do. The air passing through the internal heat exchanger 110 is converted into a warm air and then supplied to the interior of the vehicle to heat the inside of the interior of the vehicle.

The first fluid passed through the internal heat exchanger 110 is decompressed and expanded through the first expansion means 220 to become a low-pressure liquid first fluid, and then supplied to an external heat exchanger 120 serving as an evaporator. The first fluid supplied to the external heat exchanger 120 becomes a low-temperature, low-pressure gas-liquid mixture and flows into the accumulator ACC through the third heat exchanger.

At this time, the second expansion means 230 is fully opened and does not affect the state change of the first fluid.

The first fluid introduced into the third heat exchanger 130 can be heat-exchanged with the second fluid on the second fluid line. Here, heat exchange can be selectively performed, and the first fluid exchanges heat in the form of receiving heat from the second fluid when the temperature of the refrigerant is increased to improve the heating performance. For example, in the case where the outdoor temperature is a low temperature state at a predetermined temperature (for example, -10 ° C), the heating performance by the first fluid flow on the first fluid line and the operation for actively receiving the waste heat from the second fluid Mode (high heating mode) so that the heating load required for the vehicle can be satisfied.

At this time, the first fluid in the third heat exchanger 130 can be heat-exchanged with the second fluid and can receive heat from the second fluid. Here, the second fluid serves to recover the electric field waste heat and to supply heat to the first fluid through the third heat exchanger. To this end, the first on-off valve 240 on the second fluid line is closed to block the flow of the second fluid on the cabin cooler 140 side, and the second on-off valve 250 is opened, So that the second fluid can flow only toward the second side.

The first fluid, which is relatively low in temperature, low in pressure, and mixed with the gas phase and the liquid phase when introduced into the third heat exchanger 130, becomes a first fluid having a relatively high temperature, low pressure and a mixed gas phase and liquid phase, . As a result, the efficiency of the compressor (COMP) is increased and the heating efficiency is increased.

 In this process, the door 12 opens the air flow on the side of the internal heat exchanger 110, introduces into the air conditioning case, and then meets the internal heat exchanger to discharge hot air into the passenger compartment.

That is, in the heating mode, the first fluid is discharged from the compressor, condensed in the internal heat exchanger 110, reduced in pressure expansion in the first expansion device 220, evaporated in the external heat exchanger 120, 2 expansion unit 230, and the selective heat exchange process in the third heat exchanger 130 in sequence. And the second fluid serves to provide electric field waste heat to the first fluid.

Referring to Fig. 3, the defrost operation mode will be described.

As the defrosting operation method, the first fluid is supplied to the compressor (COMP), the internal heat exchanger 110, the first expansion device 220, the external heat exchanger 120, the second expansion device 230, the third heat exchanger 130 ), The accumulator (ACC), and the compressor (COMP) in this order, the first expansion means (220) is fully opened and the second fluid is introduced into the third heat exchanger (130) The first heat exchanger 150, and the third heat exchanger 130 in this order.

If the outside air is very cold in the above-described heating operation mode, there may arise a problem that frost is concealed on the surface due to the endothermic action of the external heat exchanger 120. If the defrost mode shown in FIG. 3 is temporarily applied, It is possible to prevent the frost from being frosted or to remove frost frost.

Here, the path of the directional control valve 210 to the internal heat exchanger 110 side is opened and the path directly connected to the external heat exchanger 120 side is closed. Therefore, the high temperature, high pressure, and gaseous first fluid discharged from the compressor flows into the internal heat exchanger 110 side.

The first fluid of high temperature, high pressure and gaseous phase introduced into the internal heat exchanger 110 is partially condensed while exchanging heat with the air blown into the air conditioning case through the air blowing fan 11 so that the gaseous first fluid flows into the first fluid Can be converted.

Subsequently, the first expansion means 220, located on the path through which the first fluid flows, is fully open to minimize the pressure drop and state change of the first fluid. The first fluid that has passed through the internal heat exchanger 110 can be condensed once again while exchanging heat with the outside air in the external heat exchanger 120.

At this time, since the first fluid maintains a certain amount of heat at a high temperature when it is discharged from the compressor COMP, it is possible to prevent the frost concealment in the external heat exchanger 120 or to remove frost frost. In other words, the refrigerant passing through the internal heat exchanger 110 is circulated to the external heat exchanger 120 at a medium-temperature high-pressure state without expanding, thereby exhibiting an improved defrosting ability. The defrosting time can be shortened by exerting the defrosting effect through simple valve operation without passing through a separate bypass line for defrosting.

The first fluid passing through the external heat exchanger 120 is decompressed and expanded while being passed through the second expansion means 230 to be brought into the low temperature, low pressure and liquid state, and then flows into the third heat exchanger 130 side. In the third heat exchanger 130, it is evaporated by the second fluid and converted into a low-temperature and low-pressure gas and liquid state, and flows into the accumulator ACC side.

Here, the second fluid may pass through the electric-field-waste heat recovery unit 150 to transfer the electric-field waste heat to the first fluid, so that the evaporation action in the third heat exchanger 130 can be more actively performed.

That is, in the defrosting mode, the first fluid is discharged from the compressor, condensed in the internal heat exchanger 110, passed through the fully opened first expansion means 220, re-condensed in the external heat exchanger 120, The second expansion means 230 and the third heat exchanger 130, and the second fluid provides electric field waste heat to the first fluid.

In the defrosting mode of the present invention, the operation of switching the flow direction of the first fluid is not accompanied, so that the amount of power consumption consumed in the operation of switching the flow direction can be reduced and frequent valve opening / And vibration and noise due to the vibration are reduced. Most of all, it is very simple and effective to configure and control the heat pump.

In addition, conventionally, a method has been mainly used in which the heating of the vehicle is temporarily stopped during the defrosting operation or the fluid flow cycle is reversed to temporarily reduce the heating performance. However, according to the present invention, since the first expansion means 220 is fully opened during the heating and the second expansion means 230 is switched so as to perform the expansion under reduced pressure, the interior of the vehicle can be continuously heated Therefore, the present invention has the advantage of preventing the phenomenon that the heating performance is temporarily reduced.

Referring to Fig. 4, the dehumidification-heating operation mode will be described.

As the dehumidification-heating operation method, the first fluid is supplied to the compressor (COMP), the internal heat exchanger 110, the first expansion device 220, the external heat exchanger 120, the second expansion device 230, The second expansion means 230 is fully opened and the second fluid is passed through the third heat exchanger 130, the cabin cooler 130, the accumulator ACC, and the compressor COMP in this order, The first heat exchanger 140, and the third heat exchanger 130 in this order.

Here, the path of the directional control valve 210 to the internal heat exchanger 110 side is opened and the path directly connected to the external heat exchanger 120 side is closed. Therefore, the high temperature, high pressure, and gaseous first fluid discharged from the compressor flows into the internal heat exchanger 110 side.

The first fluid of high temperature, high pressure and gaseous phase introduced into the internal heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case through the blowing fan to convert the gaseous first fluid into the liquid first fluid. The air passing through the internal heat exchanger 110 is converted into a warm air and then supplied to the interior of the vehicle to heat the inside of the interior of the vehicle.

The first fluid that has passed through the internal heat exchanger 110 is decompressed and expanded through the first expansion means 220 to become a low-pressure liquid first fluid, and then the external heat exchanger 120 serving as an evaporator is supplied. The first fluid supplied to the external heat exchanger 120 becomes a low-temperature, low-pressure gas-liquid mixture and flows into the accumulator ACC through the third heat exchanger.

At this time, the second expansion means 220 is fully opened and does not affect the state change of the first fluid.

The first fluid introduced into the third heat exchanger 130 can be heat-exchanged with the second fluid on the second fluid line. At this time, the second fluid in the third heat exchanger 130 may be heat-exchanged with the first fluid, and may be heated by the first fluid. The cooled second fluid may be supplied to the cabin cooler 140 side to cool the air supplied by the blowing fan.

That is, in the dehumidification-heating mode, the first fluid is discharged from the compressor, condensed in the internal heat exchanger 110, reduced in pressure expansion in the first expansion device 220, evaporated in the external heat exchanger 120, The second fluid passes through the second expansion means 230 and the heat exchange in the third heat exchanger 130 in sequence and the second fluid meets the air in the state of being deprived of heat by the first fluid to cool the interior of the vehicle .

The humid air introduced by the blowing fan is brought into contact with the surface of the cabin cooler 140 to be condensed, and then the air is introduced into the cabin cooler 140 to the side of the internal heat exchanger 110 which is in the heat-generating operation, so that dry air with moisture removed as a result is discharged into the passenger compartment.

As described above, according to the system of the present invention, a heat pump system that is shorter in length than the conventional heat pump system and shorter in length than the conventional heat pump system and superior in defrost efficiency to the prior art is proposed. It has a technical advantage of reducing the cost due to omission of the bypass line unlike the prior art and having a cost advantage in that the refrigerant loop length is short and the pressure drop amount is small and the internal heat exchanger does not expand the refrigerant past the internal heat exchanger, And can be circulated to the external heat exchanger, thereby improving defrost performance and shortening the time required for defrosting. In addition, it has an advantage that the heating performance is prevented from being reduced during the defrosting operation.

From the control point of view, since the present invention is a dual loop system, temperature control can be individually performed for each loop, which is advantageous in terms of system stability. Loops are dualized so that individual diagnosis can be done for each loop when a system fault diagnosis is made.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which come within the scope of the appended claims, and all variations, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims Should be understood.

10: Air conditioning case (duct)
11: blowing fan
12: Door
110: internal heat exchanger
120: External heat exchanger
130: third heat exchanger
140: cabin cooler
150: electric field heat recovery unit
210: Direction reversing valve
220: first expansion means
230: second expansion means
240: first opening / closing valve
250: Second open / close valve

Claims (13)

A first fluid line through which the first fluid flows;
A compressor for compressing and discharging the first fluid;
An internal heat exchanger for heat-exchanging the first fluid with air in the passenger compartment;
An external heat exchanger for heat-exchanging the first fluid with outside air;
First expansion means disposed on a first fluid line between the internal heat exchanger and the external heat exchanger, the first expansion means being arranged to expand the first fluid;
A second expansion means disposed on the first fluid line, the second expansion means being arranged to expand the first fluid passing through the external heat exchanger;
An accumulator for introducing gaseous refrigerant in the liquid phase and gaseous phase refrigerant on the first fluid line passing through the second expansion means into the compressor;
A third heat exchanger disposed on the first fluid line between the second expansion means and the accumulator, the third heat exchanger being heat exchangeable with the second fluid; And
And a second fluid line connected to the third heat exchanger to form a secondary loop,
Wherein the second fluid line is connected to a cabin cooler which is located inside the air conditioning case and performs heat exchange with air in the passenger compartment as a role of an evaporator in cooling or dehumidifying-heating.
The method according to claim 1,
Wherein the heat pump is used in an electric vehicle or a hybrid vehicle.
The method according to claim 1,
Wherein the first fluid is a refrigerant, and the second fluid is a cooling water.
The method according to claim 1,
Wherein the second fluid line comprises:
A cabin cooler for heat-exchanging heat with the air in the vehicle room, and an electric-component-waste heat recovery unit for heat-exchanging the electrical components.
The method according to claim 1,
On the second fluid line,
Closing valve that opens and closes the flow to the cabin cooler and a second open / close valve that opens / closes the flow to the electric-field-waste heat recovery unit.
The method according to claim 1,
Wherein the second fluid line comprises:
And recovering waste heat at the time of heating to transfer heat to the third heat exchanger.
The method according to claim 6,
Wherein the second fluid line comprises:
And when the heat source requires more heat than the heating, collects the electric waste heat and the cabin waste heat together to transfer heat to the third heat exchanger.
The method according to claim 1,
Further comprising a direction switching valve for switching a flow direction of the first fluid discharged from the compressor.
A directional switching valve, an internal heat exchanger, a first expansion means, an external heat exchanger, a second expansion means, a third heat exchanger, and an accumulator are sequentially disposed on a first fluid line through which the first fluid flows,
Closing valve and a cabin cooler are disposed in a first branch line of a second fluid line through which the second fluid flows, and a second-loop type in which a second open / close valve and a total- A method of operating an automotive heat pump,
The cabin cooler is disposed inside the air conditioner case and is operated to serve as an evaporator when cooling or dehumidifying-heating,
And performing a cooling, heating, defrosting, or dehumidifying-heating operation by connecting the flows of the first fluid and the second fluid to each other.
10. The method of claim 9,
A method for cooling operation, comprising: passing the first fluid through a compressor, a first expansion means, an external heat exchanger, a second expansion means, a third heat exchanger, an accumulator and a compressor in order,
And the second fluid is passed through the third heat exchanger, the cabin cooler, and the third heat exchanger in this order.
10. The method of claim 9,
Wherein the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, And,
And the second fluid is passed through the third heat exchanger, the total waste heat collecting unit, and the third heat exchanger in this order.
10. The method of claim 9,
Wherein the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, And,
And the second fluid is passed through the third heat exchanger, the total waste heat collecting unit, and the third heat exchanger in this order.
10. The method of claim 9,
Wherein the first fluid is passed through the compressor, the internal heat exchanger, the first expansion means, the external heat exchanger, the second expansion means, the third heat exchanger, the accumulator and the compressor in this order, Open,
And the second fluid is passed through the third heat exchanger, the cabin cooler, and the third heat exchanger in this order.

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