KR101418857B1 - Heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a heat pump system for a vehicle, and more particularly, to a heat pump system in a heat pump mode for dehumidifying a passenger compartment by bypassing an evaporator and a portion of a refrigerant circulating through a refrigerant circulation line, The evaporator can be dehumidified even during the heat pump mode by performing the defrosting control for closing the branch line through the on-off valve and blocking the refrigerant supplied to the evaporator side when the evaporation of the evaporator is recognized, The defrosting effect is obtained through the defrosting control for shutting off the refrigerant supplied to the evaporator, and the defrosting of the evaporator is further promoted by controlling the air inflow mode of the air conditioning case to the inflow mode, And more particularly to a vehicle heat pump system capable of improving stability.

Description

[0001] Heat pump system for vehicle [0002]

The present invention relates to a heat pump system for a vehicle, and more particularly, to a heat pump system in a heat pump mode for dehumidifying a passenger compartment by bypassing an evaporator and a portion of a refrigerant circulating through a refrigerant circulation line, The present invention relates to a heat pump system for a vehicle which performs a defrosting control for closing a branch line through an on-off valve to shut off the refrigerant supplied to the evaporator and controlling the inflow airflow mode.

Background Art [0002] A vehicle air conditioner generally includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. Wherein the cooling system is configured to cool air in the vehicle interior by exchanging air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle with the refrigerant flowing in the evaporator to convert into cool air, The air passing through the outside of the core is exchanged with the cooling water flowing in the inside of the heater core to warm the inside of the vehicle.

A heat pump system which can selectively perform cooling and heating by switching the flow direction of refrigerant by using one refrigerant cycle is different from the above vehicle air conditioning system. For example, two heat exchangers (That is, an indoor heat exchanger installed inside the air conditioner case for exchanging heat with air blown into the vehicle interior, and an outdoor heat exchanger for exchanging heat outside the air conditioner case), and a direction control valve for switching the flow direction of the refrigerant do. Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the direction control valve, the indoor heat exchanger functions as a cooling heat exchanger. When the heating mode is activated, the indoor heat exchanger functions as a heating heat exchanger .

Various kinds of such a heat pump system for vehicles have been proposed, and a representative example thereof is shown in Fig.

1 includes a compressor 30 for compressing and discharging a refrigerant, a high-pressure side heat exchanger 32 for dissipating the refrigerant discharged from the compressor 30, A first expansion valve 34 and a first bypass valve 36 for selectively passing the refrigerant passed through the high pressure side heat exchanger 32 and a second expansion valve 34 and a first bypass valve 36 Pressure side heat exchanger (60) for evaporating the refrigerant that has passed through the outdoor heat exchanger (48), and a low-pressure side heat exchanger (60) for evaporating the refrigerant that has passed through the outdoor heat exchanger An accumulator 62 for separating the refrigerant having passed through it into a gas phase and a liquid phase refrigerant, an internal heat exchanger 50 for exchanging heat between the refrigerant supplied to the low pressure side heat exchanger 60 and the refrigerant returning to the compressor 30, Pressure side heat exchanger (60), and a low-pressure side heat exchanger The second expansion valve 56 and the second expansion valve 56 are provided in parallel with each other so as to selectively connect the outlet side of the outdoor heat exchanger 48 and the inlet side of the accumulator 62, 2 bypass valve (58).

1, reference numeral 10 denotes an air conditioning case in which the high-pressure side heat exchanger 32 and the low-pressure side heat exchanger 60 are incorporated, reference numeral 12 denotes a temperature control door for controlling the mixing amount of cold air and warm air, And an air blower installed at the entrance of the air conditioning case.

The first bypass valve 36 and the second expansion valve 56 are closed and the first expansion valve (heating mode) 34 and the second bypass valve 58 are opened. In addition, the temperature control door 12 operates as shown in Fig. Therefore, the refrigerant discharged from the compressor 30 flows through the high-pressure side heat exchanger 32, the first expansion valve 34, the outdoor heat exchanger 48, the high-pressure portion 52 of the internal heat exchanger 50, The accumulator 62 and the low pressure section 54 of the internal heat exchanger 50 in this order. That is, the high-pressure side heat exchanger 32 serves as a radiator and the outdoor heat exchanger 48 serves as an evaporator.

When the air conditioning mode (cooling mode) is activated, the first bypass valve 36 and the second expansion valve 56 are opened, and the first expansion valve 34 and the second bypass valve 58 are closed do. Further, the temperature control door 12 closes the high-pressure side heat exchanger 32 passage. Therefore, the refrigerant discharged from the compressor 30 flows through the high-pressure side heat exchanger 32, the first bypass valve 36, the outdoor heat exchanger 48, the high-pressure portion 52 of the internal heat exchanger 50, The low pressure side heat exchanger 60, the accumulator 62 and the low pressure portion 54 of the internal heat exchanger 50 in this order. That is, the low-pressure side heat exchanger 60 serves as an evaporator, and the high-pressure side heat exchanger 32 closed by the temperature control door 12 serves as a radiator as in the heat pump mode do.

However, in the conventional vehicle heat pump system, since the operation of the low-pressure side heat exchanger (60) installed inside the air conditioner case (10) is stopped during the heat pump mode (heating mode) In order to dehumidify the inside of the vehicle, the heating performance is deteriorated by switching to the air conditioning mode while the heat pump mode is operating.

In order to solve the above-described problems, an object of the present invention is to provide a refrigerant circulation system and a refrigerant circulation system, which are capable of operating a dehumidifying mode of a heat pump mode in which a part of a refrigerant circulating in a refrigerant circulation line bypasses an evaporator and a part of the refrigerant passes through an evaporator, And the defrosting control for closing the branch line through the opening / closing valve to block the refrigerant supplied to the evaporator side is carried out, so that the inside of the car can be dehumidified even during the heat pump mode, And the defrosting of the evaporator is further promoted by switching the air inflow mode of the air conditioning case to the inflow air inflow mode to improve the heating performance and the stability of the system The present invention provides a heat pump system for a vehicle.

According to an aspect of the present invention, there is provided a refrigeration system comprising: 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 conditioning case and the refrigerant discharged from the compressor, And an evaporator provided inside the air conditioner case for exchanging heat between the air in the air conditioner case and the refrigerant supplied to the compressor, and a heat exchanger provided outside the air conditioner case for exchanging heat between the refrigerant circulating through the refrigerant circulation line and outdoor air A second expansion means provided on the 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 between the indoor heat exchanger and the outdoor heat exchanger for expanding the refrigerant, And a second heat exchanger for cooling the inlet side refrigerant of the first expansion means, A first bypass line installed to connect the circulation line and the outlet side refrigerant circulation line of the evaporator so that the refrigerant circulating through the refrigerant circulation line selectively bypasses the first expansion means and the evaporator, A second bypass line provided so as to connect the inlet side and the outlet side refrigerant circulation line of the evaporator with the refrigerant circulating in the refrigerant circulation line bypasses the outdoor heat exchanger, A first direction switching valve for switching a direction of a refrigerant flow to the first bypass line; an opening / closing valve for opening / closing a refrigerant flow of the branch line; And a control unit for controlling the system, including means for recognizing whether the refrigerant circulates through the refrigerant circulation line, When the evaporator is concealed from the conception recognition means during a dehumidification mode operation of the heat pump mode in which the evaporator is bypassed through the first bypass line and a part of the refrigerant passes through the evaporator and the dehumidifier is dehumidified through the evaporator, And closing the branch line through the opening / closing valve to shut off the refrigerant supplied to the evaporator side.

In the present invention, when the evaporator is in the dehumidification mode operation of the heat pump mode in which a part of the refrigerant circulating in the refrigerant circulation line bypasses the evaporator and partly passes through the evaporator to dehumidify the inside of the vehicle, The defrosting control for closing the branch line and shutting off the refrigerant supplied to the evaporator side is performed, thereby enabling the dehumidification of the room even during the heat pump mode, The defrost effect can be obtained through control.

Further, at the time of the defrost control, the air inflow mode of the air conditioning case is switched to the inflow air inflow mode to further promote the defrosting of the evaporator, thereby improving the heating performance and the stability of the system.

1 is a schematic view showing a conventional heat pump system for a vehicle,
FIG. 2 is a diagram showing an air conditioner mode in a heat pump system for a vehicle according to the present invention,
3 is a view showing a first heating mode of a heat pump mode in a vehicle heat pump system according to the present invention;
4 is a view showing a dehumidifying mode during a first heating mode operation of a heat pump mode in a vehicle heat pump system according to the present invention;
5 is a view showing a defrost mode during dehumidification mode operation of the first heating mode in the heat pump system for a vehicle according to the present invention.
6 is a view showing a second heating mode of the heat pump mode in the vehicle heat pump system according to the present invention.
7 is a view showing a dehumidifying mode during the second heating mode operation of the heat pump mode in the vehicle heat pump system according to the present invention;
8 is a view showing a defrost mode during dehumidification mode operation of the second heating mode in the heat pump system for a vehicle according to the present invention.

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

First, a heat pump system for a vehicle according to the present invention includes a compressor 100, an indoor heat exchanger 110, a second expansion means 120, an outdoor heat exchanger 130, The first expansion means 140 and the evaporator 160 are sequentially connected to each other and are preferably applied to an electric vehicle or a hybrid vehicle.

A first bypass line R1 for bypassing the first expansion means 140 and the evaporator 160 and a second bypass line R1 for bypassing the outdoor heat exchanger 130 are provided on the refrigerant circulation line R. [ And a first direction switching valve 191 is connected to a branch point of the first bypass line R1 and a second direction switching valve 191 is connected to a branch line of the first bypass line R1, A second direction switching valve 192 is provided at a branch point of the second bypass line R2 and the third direction switching valve 193 is installed at a branch point of the expansion line R3. do.

A branch line R4 is provided so as to connect the outlet side refrigerant circulation line R of the first expansion means 140 and the first bypass line R1, (Not shown).

2, the refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110, the outdoor heat exchanger 130, the first expansion device 140, the evaporator 160, the compressor The indoor heat exchanger 110 serves as a condenser and the evaporator 160 serves as an evaporator.

Meanwhile, the outdoor heat exchanger 130 functions as a condenser as the indoor heat exchanger 110.

3, the refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110, the second expansion means 120, the outdoor heat exchanger 130, the outdoor heat exchanger 130, 1 bypass line R1 and the compressor 100. The indoor heat exchanger 110 serves as a condenser and the outdoor heat exchanger 130 serves as an evaporator, 1 Refrigerant is not supplied to the expansion means 140 and the evaporator 160.

As described above, the heat pump system of the present invention can share the refrigerant circulation line R with the same refrigerant circulation direction in the air conditioner mode and the heat pump mode, prevents the refrigerant stagnation phenomenon that occurs when the refrigerant does not flow, The circulation line (R) can also be simplified.

In the present invention, the heat pump mode is diversified as the first heating mode, the second heating mode, the dehumidifying mode, and the defrosting mode.

In this case, a control unit (not shown), which will be described later, performs the first heating mode of the heat pump mode when the outdoor temperature is equal to or higher than the reference temperature and the second heating mode of the heat pump mode when the outdoor temperature is lower than the reference temperature.

Here, the first heating mode is performed when the outdoor temperature is 0 ° C or higher (image), and the second heating mode is performed when the outdoor temperature is lower than 0 ° C (minus).

Of course, the reference temperature of the outdoor temperature for distinguishing the first and second heating modes is not limited to 0 ° C, but may be changed according to the purpose.

Further, the dehumidification mode is performed when the user desires to dehumidify the car in the first and second heating modes, and the defrost mode, which will be described later, is performed when the defrosting operation is required due to the conception of the evaporator 160 .

Hereinafter, each component of the heat pump system will be described in detail.

First, the compressor 100 installed on the refrigerant circulation line R receives power from an engine (an internal combustion engine, a motor, or the like), sucks the refrigerant, compresses the refrigerant, and discharges the compressed refrigerant in a gas state of high temperature and high pressure.

The compressor 100 sucks and compresses the refrigerant discharged from the evaporator 160 in the air conditioning mode and supplies the compressed refrigerant to the indoor heat exchanger 110. In the heat pump mode, The refrigerant having passed through the first bypass line R1 is sucked, compressed, and supplied to the indoor heat exchanger 110 side.

In the dehumidifying mode of the heat pump mode, since the refrigerant is simultaneously supplied to the first bypass line (R1) and the evaporator (160) through the branch line (R4) described later, the compressor (100) 1 bypass line R1 and the evaporator 160, sucks the combined refrigerant, compresses it, and supplies it to the indoor heat exchanger 110 side.

The indoor heat exchanger 110 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the outlet side of the compressor 100 and is connected to the air flowing in the air conditioning case 150 The refrigerant discharged from the compressor 100 is heat-exchanged.

The evaporator 160 is installed inside the air conditioning case 150 and is connected to the refrigerant circulation line R at the inlet side of the compressor 100 so that the air flowing in the air conditioning case 150 And the refrigerant supplied to the compressor 100 is heat-exchanged.

The indoor heat exchanger 110 functions as a condenser in both the air conditioning mode and the heat pump mode,

The evaporator 160 serves as an evaporator in the air conditioning mode, and stops operating because the refrigerant is not supplied during the first and second heating modes of the heat pump mode. In the dehumidifying mode, a part of the refrigerant is supplied to serve as an evaporator Dehumidification.

At this time, the performance of the evaporator 160 in the dehumidification mode is lower than that of the evaporator 160 in the air conditioning mode.

The indoor heat exchanger 110 and the evaporator 160 are installed in the air conditioner case 150 at a predetermined distance from the air conditioner case 150, And an indoor heat exchanger 110 are sequentially installed.

2, the low-temperature and low-pressure refrigerant discharged from the first expansion means 140 is supplied to the evaporator 160. At this time, the blower (not shown) Air flowing through the air conditioning case 150 through the evaporator 160 is exchanged with the low temperature low pressure refrigerant in the evaporator 160 to be converted into cool air and then discharged to the vehicle interior The inside of the car is cooled.

3, the high-temperature and high-pressure refrigerant discharged from the compressor 100 is supplied to the indoor heat exchanger 110 and the refrigerant discharged from the outdoor heat exchanger 110 to the indoor heat exchanger 110. In the heat pump mode (first heating mode) in which the indoor heat exchanger 110 functions as a condenser, The air flowing inside the air conditioning case 150 through the blower (not shown) flows through the indoor heat exchanger 110, and the refrigerant in the indoor heat exchanger 110 is heat- And then it is discharged to the inside of the vehicle to heat the inside of the vehicle.

The size of the evaporator 160 may be larger than the size of the indoor heat exchanger 110.

The amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 are adjusted between the evaporator 160 and the indoor heat exchanger 110 in the air conditioning case 150 A temperature control door 151 is provided.

The temperature control door 151 adjusts the amount of air passing through the indoor heat exchanger 110 and the amount of air passing through the indoor heat exchanger 110 to control the temperature of the air discharged from the air conditioning case 150 Can be adjusted appropriately,

2, when the front side passageway of the indoor heat exchanger 110 is completely closed through the temperature control door 151 as shown in FIG. 2, the cold air passing through the evaporator 160 passes through the indoor heat exchanger 110, The indoor heat exchanger 110 is bypassed through the temperature control door 151 as shown in FIG. 3 during the heat pump mode (in the first heating mode) All the air passes through the indoor heat exchanger 110 serving as a condenser and is converted into warm air, and the warm air is supplied to the interior of the vehicle, so that the maximum heating is performed.

The outdoor heat exchanger 130 is installed outside the air conditioning case 150 and is connected to the refrigerant circulation line R to perform heat exchange between the refrigerant circulating in the refrigerant circulation line R and outdoor air .

The outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to exchange heat with the outdoor air.

The outdoor heat exchanger 130 functions as the same condenser as the indoor heat exchanger 110 in the air conditioning mode. At this time, the high-temperature refrigerant flowing in the outdoor heat exchanger 130 is heat-exchanged with the outdoor air, do. In the heat pump mode (first heating mode), the refrigerant acts as an evaporator opposite to the indoor heat exchanger 110. At this time, the low-temperature refrigerant flowing in the outdoor heat exchanger 130 exchanges heat with the outdoor air, .

The first expansion means 140 is installed on the refrigerant circulation line R on the inlet side of the evaporator 160 and expands the refrigerant supplied to the evaporator 160.

That is, the first expansion means 140 causes the refrigerant discharged from the outdoor heat exchanger 130 to expand into a low-temperature and low-pressure liquid state in the air conditioning mode, and then supplied to the evaporator 160 .

The first expansion means 140 may be an expansion valve, but may be an orifice.

The second expansion means 120 may be installed on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 so as to perform the outdoor heat exchange Thereby selectively expanding the refrigerant supplied to the compressor 130.

The second expansion means 120 is installed on the expansion line R3 connected in parallel on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130. [

Here, the second expansion means 120 may be formed of an orifice, but may be an expansion valve.

The refrigerant that has passed through the indoor heat exchanger 110 according to the air conditioning mode or the heat pump mode is supplied to the branch line between the expansion line R3 and the refrigerant circulation line R through the expansion line R3, A third direction switching valve 193 for switching the refrigerant flow direction to pass through the expansion means 120 or bypass the second expansion means 120 is provided.

Accordingly, in the air conditioning mode, the refrigerant discharged from the compressor 100 and passed through the indoor heat exchanger 110 by the third direction switching valve 193 bypasses the second expansion means 120 And is supplied to the outdoor heat exchanger 130. In the heat pump mode (in the first heating mode), the refrigerant is discharged from the compressor 100 by the third direction switching valve 193, The refrigerant passes through the expansion line (R3) and the second expansion means (120) and is expanded and supplied to the outdoor heat exchanger (130).

The first bypass line R1 is installed to connect the inlet side refrigerant circulation line R of the first expansion means 140 and the outlet side refrigerant circulation line R of the evaporator 160 , And the refrigerant circulating through the refrigerant circulation line (R) selectively bypasses the first expansion means (140) and the evaporator (160).

As shown in the figure, the first bypass line R1 is disposed in parallel with the first expansion means 140 and the evaporator 160, that is, the inlet side of the first bypass line R1 is connected to the outdoor Is connected to the refrigerant circulation line R connecting the heat exchanger 130 and the first expansion means 140 and the outlet side is connected to the refrigerant circulation line R connecting the evaporator 160 and the compressor 100 .

The refrigerant that has passed through the outdoor heat exchanger 130 flows to the first expansion device 140 and the evaporator 160 in the air conditioner mode. However, in the heat pump mode (first heating mode) The refrigerant that has passed through the outdoor heat exchanger 130 flows directly to the compressor 100 side through the first bypass line R 1 and bypasses the first expansion means 140 and the evaporator 160.

Here, the function of switching the flow direction of the refrigerant according to the air conditioner mode and the heat pump mode is performed through the first direction switching valve 191.

The first direction switching valve 191 is installed at a branch point between the first bypass line Rl and the refrigerant circulation line R and is connected to the outdoor heat exchanger 130 according to an air conditioning mode or a heat pump mode. The refrigerant flow direction is switched so that the refrigerant passing through the first bypass line (R1) or the first expansion means (140) flows.

At this time, the first directional control valve 191 controls the refrigerant discharged from the compressor 100 in the air conditioning mode and passed through the indoor heat exchanger 110 and the outdoor heat exchanger 130 to flow through the first expansion means 140, The refrigerant discharged from the compressor 100 flows through the indoor heat exchanger 110 and the second expansion means 120 and the outdoor heat exchanger 120. In the heat pump mode, So that the refrigerant passing through the first bypass line (130) flows in the first bypass line (R1).

Meanwhile, the first directional control valve 191 is provided at a branch point on the inlet side of the first bypass line R1, and it is preferable to use a three-way valve.

It is preferable that not only the first direction switching valve 191 but also the second direction switching valve 192 and the third direction switching valve 193 use a three-way valve.

The second bypass line R2 is installed in parallel with the refrigerant circulation line R so that the refrigerant selectively passing through the second expansion means 120 bypasses the outdoor heat exchanger 130, That is, the second bypass line (R2) is provided to connect the inlet-outlet refrigerant circulation line (R) of the outdoor heat exchanger (130), so that the refrigerant circulating in the refrigerant circulation line (R) (130).

The refrigerant is circulated through the outdoor heat exchanger 130 or the second bypass line R2 at a branch point between the second bypass line R2 and the refrigerant circulation line R, A second direction switching valve 192 for switching the flow direction is provided.

At this time, when the outdoor temperature is an image, the refrigerant is controlled to flow to the outdoor heat exchanger 130 through the control of the second direction switching valve 192. When the outdoor temperature is zero, The refrigerant is controlled to flow to the second bypass line (R2) by bypassing the outdoor heat exchanger (130) through the control of the control unit (192).

In other words, the refrigerant passing through the second expansion means (120), as in the second heating mode of Fig. 6, is cooled by the outdoor heat exchanger (130) and flows to the second bypass line (R2) side.

An electric heater 115 is further installed on the downstream side of the indoor heat exchanger 110 in the air conditioning case 150 to improve the heating performance.

That is, the heating performance can be improved by operating the electric heating type heater 115 as an auxiliary heat source at the start of the vehicle, and the electric heating type heater 115 can be operated even when the heating heat source is insufficient.

As the electric heater 115, a PTC heater is preferably used.

On the first bypass line R1, a heat supply means 180 for supplying heat to the refrigerant flowing along the first bypass line R1 is installed.

The heat supply unit 180 is connected to the first bypass line Rl so that waste heat of the vehicle electrical product 200 can be supplied to the refrigerant flowing through the first bypass line R1, And a cooling water heat exchanger 181b which is provided at one side of the refrigerant heat exchanger 181a and is capable of heat exchange and in which the cooling water circulating in the vehicle electrical appliance 200 flows, .

Therefore, the heating performance can be improved by recovering the heat source from the waste heat of the vehicle electrical equipment 200 in the heat pump mode.

On the other hand, the vehicle electrical equipment 200 is typically a motor, an inverter, or the like.

The inlet side first bypass line (R1) of the heat supply means (180) is connected to the evaporator (160) to supply a part of the refrigerant flowing toward the heat supply means (180) along the first bypass line (R1) And a branch line R4 connecting the inlet side refrigerant circulation line R of the evaporator 160 and an opening and closing valve 195 for opening and closing the refrigerant flow are provided on the branch line R4.

The open / close valve 195 is opened in the dehumidification mode, so that some of the refrigerant flowing toward the first bypass line R1 by the first direction switching valve 191 passes through the water-cooled heat exchanger 181, 200 and some of them are dehumidified while passing through the evaporator 160 through the branch line R4.

Accordingly, the air flowing inside the air conditioning case 150 is dehumidified while passing through the evaporator 160, that is, during the heat pump mode operation such as the first and second heating modes, the branch line R4 The evaporator 160 can supply a part of the refrigerant to perform the dehumidification in the passenger compartment.

On the other hand, in order to improve the heating performance by recovering the heat source of the indoor air during the second heating mode in which the outdoor temperature is zero and the dehumidification mode in the second heating mode, the air inflow mode To enter the air conditioning case (150).

A controller (not shown) is provided to control the heat pump system of the present invention. The controller includes a first direction switching valve 191 for switching the refrigerant flow direction to the first bypass line R1, An on-off valve 195 for opening and closing the refrigerant flow of the branch line R4, and an ignition recognizing means (not shown) for recognizing the ignition of the outdoor heat exchanger 130.

Of course, the control unit may include a second direction switching valve 192, a third direction switching valve 193, an electric heating heater (not shown), and a second direction switching valve 192, as well as the first direction switching valve 191, 115 and the like.

The control unit may be configured such that a part of the refrigerant circulating through the refrigerant circulation line R bypasses the evaporator 160 through the first bypass line R1 and a part of the refrigerant bypasses the evaporator 160 through the branch line R4 Closing valve (195) to close the branch line (R4) through the opening / closing valve (195) when the evaporator (160) is concealed from the conception recognizing means during dehumidification mode operation of the heat pump mode for dehumidifying the passenger compartment And the defrost control for shutting off the refrigerant supplied to the evaporator 160 is performed.

That is, in the dehumidifying mode during the first heating mode operation of the heat pump mode or during the dehumidifying mode during the second heating mode operation of the heat pump mode, the refrigerant flowing into the evaporator 160 is heat- The surface of the evaporator 160 may drop below the freezing point. In this case, conception is started to occur on the surface of the evaporator 160. If the conception is continuously enlarged at this time, the evaporator 160 can not absorb heat The temperature of the refrigerant in the system is lowered and the temperature of the air discharged into the room is lowered. As a result, the heating performance is deteriorated, and the liquid refrigerant can flow into the compressor 100 and the stability of the system is lowered .

Therefore, when the controller recognizes the conception of the evaporator 160 from the conception recognition means in the dehumidifying mode during the first and second heating mode operation of the heat pump mode, the control unit controls the branch line R4 through the on- Defrosting mode in which a part of the refrigerant flowing toward the heat supply unit 180 side is prevented from being supplied to the evaporator 160 side along the first bypass line R1 is performed.

At this time, when the defrosting control (defrosting mode) is performed due to the conception of the evaporator 160 during the dehumidification mode operation, the refrigerant supplied to the evaporator 160 is blocked, so that the concealed evaporator 160 is defrosted .

In addition, when the defrost control (defrost mode) is performed, the control unit controls the air inflow mode of the air conditioning case 150 to enter the air inflow mode, thereby further promoting defrosting of the concealed evaporator 160.

The conception recognizing means is provided with a conception sensor (not shown) in the evaporator 160 so as to sense conception of the evaporator 160. Of course, it is also possible to provide a temperature sensor for sensing the surface temperature of the evaporator 160 as well as the conception sensor.

In addition, a temperature sensor (not shown) for sensing the temperature of the discharged air is installed on the side of the vehicle compartment outlet port connected to the air conditioning case 150.

The controller senses the temperature of the air discharged from the air conditioning case 150 to the passenger compartment during the defrosting control (defrost mode) through the temperature sensor, and controls the electric heater 115 to operate can do. In other words, when defrost control is insufficient, the capacity of the electric heater 115 is increased.

Meanwhile, the second heating mode and the defrost mode are controlled in a refrigerant circulation path and an inflow air inflow mode, while the second heating mode is a mode operating in a condition where the outdoor temperature is zero, A mode in which the evaporator 160 is activated when the dehumidification mode of the heating mode is operated, and the operating conditions are different from each other.

A part of the refrigerant flowing toward the heat supply unit 180 of the first bypass line R1 is supplied to the evaporator 160 through the branch line R4 in the dehumidifying mode of the first and second heating modes, If the evaporator 160 is concealed, the controller closes the branch line R4 to shut off the refrigerant supplied to the evaporator 160, and controls the air conditioner case 150 (Defrosting mode) in which the evaporator 160 is defrosted by controlling the evaporator 160 in the air inflow mode so that defrosting of the evaporator 160 is accelerated as the air enters the air conditioning case 150 Thereby improving the heating performance and the stability of the system. In addition, even when the evaporator 160 is concealed, the system can be continuously operated without stopping the compressor 100.

On the other hand, an accumulator 170 is installed on the refrigerant circulation line R on the inlet side of the compressor 100.

The accumulator 170 separates the liquid refrigerant and the gaseous refrigerant from the refrigerant supplied to the compressor 100 so that only the gaseous refrigerant can be supplied to the compressor 100.

Hereinafter, the operation of the vehicle heat pump system according to the present invention will be described.

end. Air conditioning mode (cooling mode) (Fig. 2)

In the air conditioning mode (cooling mode), as shown in FIG. 2, the first bypass line R1 is closed through the first direction switching valve 191, and the first bypass line R1 is closed through the second direction switching valve 192 The second bypass line R2 is also closed, and the third direction switching valve 193 closes the expansion line R3.

The cooling water circulating through the electrical component 200 is not supplied to the water-cooled heat exchanger 181 of the heat supply unit 180.

On the other hand, at the time of maximum cooling, the temperature control door 151 in the air conditioning case 150 is operated to close the passage through the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower Is cooled while passing through the evaporator (160), and is then supplied to the interior of the vehicle by bypassing the indoor heat exchanger (110), thereby cooling the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is supplied to the indoor heat exchanger 110 installed in the air conditioning case 150.

The refrigerant supplied to the indoor heat exchanger 110 is supplied to the outdoor heat exchanger 130 without heat exchange with air because the temperature control door 151 closes the passage on the indoor heat exchanger 110 as shown in FIG. .

The refrigerant flowing into the outdoor heat exchanger 130 is condensed while exchanging heat with the outdoor air, thereby changing the gaseous refrigerant into the liquid refrigerant.

Meanwhile, both the indoor heat exchanger 110 and the outdoor heat exchanger 130 perform the condenser dynamics, but the refrigerant is mainly condensed in the outdoor heat exchanger 130 that performs heat exchange with the outdoor air.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 is decompressed and expanded in the process of passing through the first expansion means 140 to be a low-temperature low-pressure liquid-phase refrigerant, and then flows into the evaporator 160.

The refrigerant flowing into the evaporator 160 is heat-exchanged with the air blown into the air conditioning case 150 through the blower to evaporate, and at the same time, the air is cooled by an endothermic effect due to the latent heat of evaporation of the refrigerant. And supplied to the vehicle interior to be cooled.

Then, the refrigerant discharged from the evaporator 160 flows into the compressor 100 and recycles the cycle as described above.

I. In the first heating mode (Fig. 3) of the heat pump mode,

The first heating mode of the heat pump mode operates under the condition that the outdoor temperature is an image and uses the outdoor air and the waste heat of the vehicle electrical equipment 200 as a heat source. The first bypass line R1 is opened and the refrigerant is not supplied to the first expansion means 140 and the evaporator 160 side.

The second bypass line R2 is closed through the second direction switching valve 192 and the expansion line R3 is opened through the third direction switching valve 193.

On the other hand, the cooling water heated by the vehicle electrical component 200 is supplied to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181 serving as the heat supply means 180.

In the first heating mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, and is blown into the air conditioning case 150 by the blower Air passes through the evaporator 160 (operation stop), passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 flows into the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing into the expansion line R3 flows through the second Pressure low-temperature liquid refrigerant in the process of passing through the expansion means 120, and then supplied to the outdoor heat exchanger 130 serving as an evaporator.

The refrigerant supplied to the outdoor heat exchanger 130 is evaporated while exchanging heat with the outdoor air and then passed through the first bypass line R1 by the first direction switching valve 191. At this time, The refrigerant passing through the pass line R1 is heat-exchanged with the cooling water passing through the cooling water heat exchanging part 181b in the process of passing through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181, And then recycles the cycle as described above while flowing into the compressor 100.

All. During the first heating mode operation of the heat pump mode,

The dehumidification mode during the first heating mode operation of the heat pump mode is activated when the room dehumidification is required during operation in the first heating mode of FIG.

Therefore, only the portions different from the first heating mode of FIG. 3 will be described.

In the dehumidifying mode, the branch line R4 is further opened through the opening / closing valve 195 in the first heating mode.

In the dehumidifying mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower After passing through the evaporator 160, the refrigerant passes through the indoor heat exchanger 110 and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, so that the change in the room temperature is minimized, and the air passing through the evaporator 160 is dehumidified smoothly.

Next, the refrigerant circulation process will be described.

The refrigerant having passed through the compressor 100, the indoor heat exchanger 110, the second expansion means 120 and the outdoor heat exchanger 130 is supplied to the first bypass line R1 A part of the refrigerant passing through the first bypass line R 1 passes through the cooling water heat exchanging part 181 b in the process of passing through the refrigerant heat exchanging part 181 a of the water- Exchanges heat with the cooling water passing therethrough and evaporates while recovering the waste heat of the vehicle electrical component 200. A part of the refrigerant is supplied to the evaporator 160 through the branch line R4 and exchanges heat with air flowing in the air conditioning case 150 And evaporates during the process.

In this process, the air passing through the evaporator 160 is dehumidified, and the dehumidified air passing through the evaporator 160 is converted into hot air while passing through the indoor heat exchanger 110, Dehumidification is heated.

Then, the refrigerant having passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100, and recycles the cycle as described above.

la. During the dehumidification mode operation of the first heating mode (defrost control) (Fig. 5)

The defrosting mode during the dehumidification mode operation of the first heating mode is a mode that operates when the evaporator 160 is concealed from the conception recognition means during the dehumidification mode operation of the first heating mode, The branch line R4 is closed through the control unit and the air conditioning case 150 is controlled to the inflow inflow mode in which the indoor air (indoor air) flows.

The cooling water heated by the vehicle electrical component 200 is supplied to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181 serving as the heat supply means 180. [

In the defrosting mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that air blown into the air conditioning case 150 by the blower Passes through the evaporator 160, passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 flows into the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing into the expansion line R3 flows through the second Pressure low-temperature liquid refrigerant in the process of passing through the expansion means 120, and then supplied to the outdoor heat exchanger 130 serving as an evaporator.

The refrigerant supplied to the outdoor heat exchanger 130 is evaporated while exchanging heat with the outdoor air and is then passed through the first bypass line R1 by the first direction switching valve 191. At this time, The refrigerant passing through the pass line R1 is heat-exchanged with the cooling water passing through the cooling water heat exchanging part 181b in the process of passing through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181, And then recycles the cycle as described above while flowing into the compressor 100.

In addition, the supply of the refrigerant to the evaporator 160 is interrupted through the defrost control of the controller, and the evaporator 160 is defrosted as the air is introduced into the air conditioning case 150.

hemp. In the second heating mode of the heat pump mode (Fig. 6)

The second heating mode of the heat pump mode operates under the condition that the outdoor temperature is below zero and uses the room air (inflow inflow mode) and the waste heat of the vehicle electrical equipment 200 as a heat source. The first bypass line R1 is opened through the direction switching valve 191 and the second bypass line R2 is opened through the second direction switching valve 192. [

The branch line R4 is closed through the opening and closing valve 195 and the expansion line R3 is opened through the third direction switching valve 193 so that the air is introduced into the air conditioning case 150 To enter the stall flow-in mode.

On the other hand, the cooling water heated by the vehicle electrical component 200 is supplied to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181 serving as the heat supply means 180.

In the second heating mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that air is blown into the air conditioning case 150 by the blower Air passes through the evaporator 160 (operation stop), passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 flows into the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing into the expansion line R3 flows into the second The refrigerant flows to the second bypass line (R2) and bypasses the outdoor heat exchanger (130). The liquid refrigerant flows through the second bypass line (R2).

Then, the refrigerant having passed through the second bypass line R2 passes through the first bypass line R1 by the first direction switching valve 191. At this time, the first bypass line R1 Is heat-exchanged with the cooling water passing through the cooling water heat exchanging part 181b in the process of passing through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181 to recover the waste heat of the vehicle electrical equipment 200 , And recycles the cycle as described above while flowing into the compressor (100).

bar. 7) during the second heating mode operation of the heat pump mode,

The dehumidification mode during the second heating mode operation of the heat pump mode is activated when the room dehumidification is required during operation in the second heating mode of FIG.

Therefore, only the portions different from the second heating mode of FIG. 6 will be described.

In the dehumidifying mode, the branch line R4 is further opened through the opening / closing valve 195 in the second heating mode.

In the dehumidifying mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that the air blown into the air conditioning case 150 by the blower After passing through the evaporator 160, the refrigerant passes through the indoor heat exchanger 110 and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

At this time, since the amount of the refrigerant supplied to the evaporator 160 is small, the air cooling performance is low, so that the change in the room temperature is minimized, and the air passing through the evaporator 160 is dehumidified smoothly.

Next, the refrigerant circulation process will be described.

The refrigerant having passed through the compressor 100, the indoor heat exchanger 110, the second expansion means 120 and the second bypass line R2 is supplied to the first bypass line 191 by the first direction switching valve 191, A part of the refrigerant passing through the first bypass line R1 passes through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181, and the cooling water heat exchanging part 181b And a part of the air is supplied to the evaporator 160 through the branch line R4 and flows through the air flowing inside the air conditioning case 150 It evaporates during heat exchange.

In this process, the air passing through the evaporator 160 is dehumidified, and the dehumidified air passing through the evaporator 160 is converted into hot air while passing through the indoor heat exchanger 110, Dehumidification is heated.

Then, the refrigerant having passed through the water-cooled heat exchanger 181 and the evaporator 160 is combined and then flows into the compressor 100, and recycles the cycle as described above.

four. During the dehumidification mode operation of the second heating mode (defrost control) (Fig. 8)

The defrosting mode during the dehumidification mode operation of the second heating mode is a mode that operates when the evaporator 160 is concealed from the conception recognition means during the dehumidification mode operation of the second heating mode, The branch line R4 is closed through the control unit, and the air conditioning case 150 is continuously controlled in the air inflow mode.

The cooling water heated by the vehicle electrical component 200 is supplied to the cooling water heat exchanger 181b of the water-cooled heat exchanger 181 serving as the heat supply means 180. [

In the defrosting mode, the temperature control door 151 in the air conditioning case 150 is operated to close the passage bypassing the indoor heat exchanger 110, so that air blown into the air conditioning case 150 by the blower Passes through the evaporator 160, passes through the indoor heat exchanger 110, and is converted into hot air to be supplied to the interior of the vehicle, thereby heating the interior of the vehicle.

Next, the refrigerant circulation process will be described.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 100 after being compressed is introduced into the indoor heat exchanger 110 installed inside the air conditioning case 150.

The high-temperature, high-pressure gaseous refrigerant introduced into the indoor heat exchanger 110 is condensed while exchanging heat with the air blown into the air conditioning case 150 through the blower. At this time, air passing through the indoor heat exchanger 110 After changing to hot air, it is supplied to the interior of the vehicle, and the interior of the vehicle is heated.

Subsequently, the refrigerant discharged from the indoor heat exchanger 110 flows into the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing into the expansion line R3 flows through the second Pressure low-temperature liquid refrigerant in the process of passing through the expansion means 120, and then bypasses the outdoor heat exchanger 130 through the second bypass line R2.

The refrigerant having passed through the second bypass line R2 passes through the first bypass line R1 by the first direction switching valve 191. At this time, After passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181, the passing refrigerant undergoes heat exchange with the cooling water passing through the cooling water heat exchanger 181b to recover the waste heat of the vehicle electrical appliance 200, The refrigerant flows into the compressor 100 and recycles the cycle as described above.

In addition, the supply of the refrigerant to the evaporator 160 is interrupted through the defrost control of the controller, and the evaporator 160 is defrosted as the air is introduced into the air conditioning case 150.

100: compressor 110: indoor heat exchanger
115: Electric heater
120: second expansion means
130: outdoor heat exchanger 140: first expansion means
150: air conditioning case 151: temperature control door
160: Evaporator 170: Accumulator
180: Heat supply unit 181: Water-cooled heat exchanger
181a: refrigerant heat exchanger 181b: cooling water heat exchanger
191: first direction switching valve 192: second direction switching valve
193: third direction switching valve 195: opening / closing valve
200: Electrical equipment
R: refrigerant circulation line R1: first bypass line
R2: second bypass line R3: inflation line
R4: Branch line

Claims (6)

The compressor 100 is installed in the refrigerant circulation line R and compresses and discharges the refrigerant. The compressor 100 is installed inside the air conditioning case 150 and discharges air in the air conditioning case 150 and the air discharged from the compressor 100 An evaporator 160 installed inside the air conditioner case 150 for exchanging heat between the air in the air conditioner case 150 and the refrigerant supplied to the compressor 100, An outdoor heat exchanger 130 installed outside the air conditioning case 150 for exchanging heat between the refrigerant circulating in the refrigerant circulation line R and the outdoor air, and an outdoor heat exchanger 130 disposed on the inlet side refrigerant circulation line R of the evaporator 160 And a second expansion means provided on the refrigerant circulation line (R) between the indoor heat exchanger (110) and the outdoor heat exchanger (130) for expanding the refrigerant, (120), the heat pump system comprising:
A refrigerant circulation line R connected to an inlet side refrigerant circulation line R of the first expansion means 140 and an outlet side refrigerant circulation line R of the evaporator 160, A first bypass line R1 for selectively bypassing the first expansion means 140 and the evaporator 160,
The second heat exchanger 130 is installed to connect the inlet side and the outlet side refrigerant circulation line R of the outdoor heat exchanger 130 so that the refrigerant circulating in the refrigerant circulation line R bypasses the outdoor heat exchanger 130. A pass line R2,
A branch line R4 installed to connect the first bypass line R1 and the inlet side refrigerant circulation line R of the evaporator 160,
A first direction switching valve 191 for switching the direction of refrigerant flow to the first bypass line R1, an opening and closing valve 195 for opening and closing the refrigerant flow of the branch line R4, And a control unit for controlling the system,
The control unit may be configured such that a part of the refrigerant circulating through the refrigerant circulation line R bypasses the evaporator 160 through the first bypass line R1 and a part of the refrigerant bypasses the evaporator 160 through the branch line R4 Closing valve (195) to close the branch line (R4) through the opening / closing valve (195) when the evaporator (160) is concealed from the conception recognizing means during dehumidification mode operation of the heat pump mode for dehumidifying the passenger compartment And performs defrost control to shut off the refrigerant supplied to the heat exchanger (160). The method according to claim 1,
Wherein the control unit switches the air inflow mode of the air conditioning case (150) to the air inflow mode during the defrost control. The method according to claim 1,
Wherein the conception recognizing means comprises a conception sensor installed on the evaporator (160) to sense the conception of the evaporator (160). The method according to claim 1,
And a heat supply means (180) for supplying heat to the refrigerant flowing along the first bypass line (R1) is provided on the first bypass line (R1). 5. The method of claim 4,
The heat supply unit 180 is connected to the first bypass line Rl so that waste heat of the vehicle electrical product 200 can be supplied to the refrigerant flowing through the first bypass line R1, And a cooling water heat exchanger 181b which is provided at one side of the refrigerant heat exchanger 181a and is capable of heat exchange and in which the cooling water circulating in the vehicle electrical appliance 200 flows, And the heat pump system. 5. The method of claim 4,
In the heat pump mode,
A first heating mode in which the refrigerant circulating in the refrigerant circulation line R circulates through the outdoor heat exchanger 130 and the heat supply unit 180 of the first bypass line R1,
The refrigerant circulating in the refrigerant circulation line R bypasses the outdoor heat exchanger 130 through the second bypass line R2 and is then supplied to the heat supply unit 180 of the first bypass line R1, And a second heating mode for circulating the heat pump system.

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