KR20130101254A - Heat pump system for vehicle - Google Patents

Abstract

PURPOSE: A heat pump system for vehicles is provided to perform the defrosting control by controlling an upper limit of the rotation number of a compressor below the predetermined rotation number preventing the frosting of an evaporator while the defrosting mode is maintained when the frosting of the evaporator is recognized for operating a defrosting mode of a heat pump mode. CONSTITUTION: A heat pump system for vehicles comprises a first bypass line (R1), a second bypass line (R2), a branch line (R4), and a control unit. The first bypass line allows the refrigerant circulating in a refrigerant circulating line (R) to selectively bypass a first expansion unit (140) and an evaporator (160). The second bypass line is installed to connect a refrigerant circulating line of an entrance and an exit of an outdoor heat exchanger (130) and allows the refrigerant circulating in the refrigerant circulating line to bypass the outdoor heat exchanger. The branch line connects the first bypass line and the refrigerant circulating line of the entrance of the evaporator. The control unit performs the defrosting control by controlling an upper limit of the rotation number of a compressor (100) below the predetermined rotation number while a defrosting mode is maintained when the frosting of the evaporator is recognized from a frosting recognizing member for operating the defrosting mode of a heat pump mode. In the defrosting mode of the heat pump mode, a part of the refrigerant circulating in the refrigerant circulating line bypasses the evaporator through the first bypass line and the other part defrosts the indoor vehicle by passing the evaporator through the branch line. [Reference numerals] (AA) Regulate the maximum rotating number of a compressor

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 controller controls the defrosting control by regulating the upper limit value of the compressor rotational speed to be equal to or lower than a predetermined rotational speed that prevents the evaporator from being frozen while maintaining the dehumidifying 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, The dehumidification of the inside of the vehicle can be performed not only in the heat pump mode but also in the defrost control by regulating the upper limit value of the compressor rotational speed to be equal to or lower than a predetermined number of revolutions to prevent the impeller from being frozen while maintaining the dehumidification mode And the lower limit value of the compressor rotational speed is controlled to be less than a predetermined number of rotations, the refrigerant pressure and the temperature are increased due to the reduction of the refrigerant flow rate of the system, so that the conception delay and defrosting effect can be obtained, And to provide a heat pump system for a vehicle.

The present invention for achieving the above object is, respectively installed on the refrigerant circulation line, the compressor for compressing and discharging the refrigerant, and installed inside the air conditioning case heat exchange between the air in the air conditioning case and the refrigerant discharged from the compressor A heat exchanger installed inside the air conditioning case to exchange heat between the air in the air conditioning case and the refrigerant supplied to the compressor, and a heat exchanger installed outside the air conditioning case to circulate the refrigerant circulation line with the outdoor air. A first expansion means installed on the refrigerant circulation line at the inlet side of the evaporator to expand the refrigerant, and a second expansion installed on the refrigerant circulation line between the indoor heat exchanger and the outdoor heat exchanger to expand the refrigerant. In the vehicle heat pump system comprising a means, the refrigerant inlet side 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, The controller controls the defrosting control by regulating the upper limit value of the compressor rotational speed to be equal to or less than a predetermined number of rotations preventing the evaporation of the evaporator while maintaining the dehumidification mode.

In the present invention, when the evaporator is conceived during a dehumidification mode operation of a heat pump mode in which a part of the refrigerant circulating in the refrigerant circulation line is dehumidified by bypassing the evaporator and partly passing through the evaporator, And the upper limit value of the compressor rotational speed is regulated to be equal to or less than a predetermined rotational speed to prevent the evaporator from being frozen, thereby performing dehumidification in the car even during the defrost control as well as the heat pump mode, Is regulated below a certain number of revolutions, the pressure and temperature of the refrigerant increase due to the reduction of the refrigerant flow rate of the system, so that the delay of the evaporation of the evaporator and the defrosting effect can be obtained and the heating performance and stability of the system can be improved.

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 block diagram showing a second heating mode of the heat pump mode in a 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 in the second heating mode in the heat pump system for a vehicle according to the present invention.
9 is a graph showing a case where the number of revolutions of the compressor is regulated when the evaporator is conceived during dehumidification mode operation 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, the vehicle heat pump system according to the present invention, the compressor 100, the indoor heat exchanger 110, the second expansion means 120, the outdoor heat exchanger 130 and the refrigerant circulation line (R) 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.

In addition, on the refrigerant circulation line R, the first bypass line R1 bypasses the first expansion means 140 and the evaporator 160 and the second bypass bypasses the outdoor heat exchanger 130. A line R2 and an expansion line R3 on which the second expansion means 120 are installed are connected in parallel, respectively, and a first direction switching valve 191 is formed at a branch point of the first bypass line R1. Is installed, a second diverter valve 192 is installed at a branch point of the second bypass line R2, and a third diverter 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).

Therefore, in the air conditioner mode, the refrigerant discharged from the compressor 100 as shown in Figure 2 is the indoor heat exchanger 110, the outdoor heat exchanger 130, the first expansion means 140, the evaporator 160, the compressor ( 100 is sequentially circulated, wherein 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.

In the heat pump mode (first heating mode), the refrigerant discharged from the compressor 100 as shown in Figure 3 is the indoor heat exchanger 110, the second expansion means 120, the outdoor heat exchanger 130, 1 bypass line (R1), the compressor 100 is sequentially circulated, wherein the indoor heat exchanger 110 serves as a condenser and the outdoor heat exchanger 130 serves as an evaporator, One expansion means 140 and the evaporator 160 is not supplied to the refrigerant.

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 in the first heating mode, the second heating mode, the dehumidification mode, and the defrost mode.

At this time, the controller (not shown), which will be described later, performs the first heating mode of the heat pump mode when the outdoor temperature is higher than the reference temperature, and performs the second heating mode of the heat pump mode when the outdoor temperature is less than the reference temperature.

Here, if the outdoor temperature is 0 ° C. or more (image), the first heating mode is performed. If the outdoor temperature is less than 0 ° C. (zero), the second heating mode is performed.

Of course, the reference temperature of the outdoor temperature for distinguishing the first and second heating modes is not limited to 0 ° C., and 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 the evaporator performance of the evaporator 160 in the air conditioner 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.

Therefore, in the air conditioner mode in which the evaporator 160 serves as an evaporator, as shown in FIG. 2, a low temperature low pressure refrigerant discharged from the first expansion means 140 is supplied to the evaporator 160, and at this time, a blower ( The air flowing through the inside of the air conditioning case 150 through the evaporator 160 is exchanged with the low temperature low pressure refrigerant inside the evaporator 160 to be converted into cold air, and then discharged into the vehicle interior. The interior 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 exchange heat between the refrigerant circulating through the refrigerant circulation line R and the outdoor air. Let's go.

Here, the outdoor heat exchanger 130 is installed on the front side of the vehicle engine room to heat exchange the refrigerant flowing inside with the outdoor air.

The outdoor heat exchanger 130 serves as the same condenser as the indoor heat exchanger 110 in the air conditioner mode, where the high temperature refrigerant flowing inside the outdoor heat exchanger 130 is condensed as it exchanges heat with outdoor air. do. In the heat pump mode (first heating mode) to serve as an evaporator opposite to the indoor heat exchanger 110, wherein the low-temperature refrigerant flowing inside the outdoor heat exchanger 130 is heat-exchanged with the outdoor air to evaporate Done.

In addition, the first expansion means 140 is installed on the inlet refrigerant circulation line R of the evaporator 160 to expand the refrigerant supplied to the evaporator 160.

That is, the first expansion means 140 expands the refrigerant discharged from the outdoor heat exchanger 130 in the air conditioner mode so as to be in a liquid phase (wet-saturated) state at low temperature and low pressure, and then supplies it to the evaporator 160. Done.

The first expansion means 140 is preferably made of an expansion valve, but may be made of an orifice.

In addition, the second expansion means 120 is installed on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130, and performs the outdoor heat exchange according to the air conditioner mode or the heat pump mode. The refrigerant supplied to the unit 130 is selectively expanded.

The second expansion means 120 is installed on an 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.

In addition, at the branch point of the expansion line (R3) and the refrigerant circulation line (R), the refrigerant passing through the indoor heat exchanger (110) in accordance with the air conditioning mode or the heat pump mode through the expansion line (R3) a second A third direction switching valve 193 is installed to change the refrigerant flow direction so as to pass through the expansion means 120 or bypass the second expansion means 120.

Therefore, in the air conditioner mode, the refrigerant discharged from the compressor 100 by the third direction switching valve 193 and passed through the indoor heat exchanger 110 bypasses the second expansion means 120. It is supplied to the outdoor heat exchanger 130, and in the heat pump mode (in the first heating mode), is discharged from the compressor (100) by the third direction switching valve (193) to the indoor heat exchanger (110) The refrigerant passing through is expanded while passing through the expansion line R3 and the second expansion means 120, and then is supplied to the outdoor heat exchanger 130.

The first bypass line R1 is installed to connect the inlet refrigerant circulation line R of the first expansion means 140 and the outlet refrigerant circulation line R of the evaporator 160. The refrigerant circulating in the refrigerant circulation line R selectively bypasses the first expansion means 140 and the evaporator 160.

As shown in the drawing, 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 located outdoors. It is connected to the refrigerant circulation line (R) for connecting the heat exchanger 130 and the first expansion means 140, the outlet side is connected to the refrigerant circulation line (R) for connecting the evaporator (160) and the compressor (100). .

Thus, in the air conditioner mode, the refrigerant passing through the outdoor heat exchanger 130 flows to the first expansion means 140 and the evaporator 160, but in the heat pump mode (in the first heating mode), The refrigerant passing through the outdoor heat exchanger 130 flows directly to the compressor 100 through the first bypass line R1 to bypass 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 the branch point of the first bypass line (R1) and the refrigerant circulation line (R), the outdoor heat exchanger 130 according to the air conditioner mode or the heat pump mode Refrigerant passing through the refrigerant flow direction is changed so as to flow to the first bypass line (R1) or the first expansion means (140).

At this time, the first direction switching valve 191, the refrigerant discharged from the compressor 100 in the air conditioner mode and passed through the indoor heat exchanger 110 and the outdoor heat exchanger 130 is the first expansion means 140 and The direction is changed to flow to the evaporator 160 side, and discharged from the compressor 100 in the heat pump mode (in the first heating mode), the indoor heat exchanger 110 and the second expansion means 120 and the outdoor heat exchanger. The refrigerant is passed through the 130 to change the direction to flow to 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.

In addition, a second bypass line R2 is installed in parallel in the refrigerant circulation line R such 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 installed to connect the inlet and outlet side refrigerant circulation lines R of the outdoor heat exchanger 130 so that the refrigerant circulating through the refrigerant circulation line R is the outdoor heat exchanger. Bypass (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.

In this case, 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, and when the outdoor temperature is below zero, the second direction switching valve Through the control of 192, the refrigerant is controlled to bypass the outdoor heat exchanger 130 and flow toward the second bypass line R2.

In other words, in a low heat source condition in which the outdoor temperature is below zero, as shown in the second heating mode of FIG. Bypass 130 to flow 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 a refrigerant heat exchanger through which the refrigerant flowing through the first bypass line R1 flows to supply the waste heat of the vehicle electronics 200 to the refrigerant flowing through the first bypass line R1. A water-cooled heat exchanger 181 including a portion 181a and a coolant heat exchanger 181b provided at one side of the refrigerant heat exchanger 181a and having a coolant circulating in the vehicle electrical equipment 200 flows therethrough. It is done by

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 160), and when the evaporator (160) is concealed from the conception recognizing means during dehumidification mode operation of the heat pump mode for dehumidifying the inside of the vehicle, an upper limit value of the number of revolutions of the compressor Is controlled to be equal to or less than a predetermined number of rotations preventing the evaporation of the evaporator (160), thereby performing defrost control.

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 .

Accordingly, when the control unit recognizes the conception of the evaporator 160 from the conception recognizing means in the dehumidifying mode during the first and second heating mode operations of the heat pump mode, 100) is controlled to be equal to or lower than a predetermined number of revolutions for preventing the evaporation of the evaporator 160, that is, a defrost mode.

When the number of revolutions of the compressor 100 is reduced, the flow rate of the refrigerant circulating in the system is reduced. As a result, the pressure and the temperature of the refrigerant in the system are increased, thereby delaying the defrosting and defrosting of the evaporator 160. The heating performance and stability of the system can be improved.

In other words, it is noted that the compressor (100) does not generate frost (freezing) in the evaporator (160) when the compressor (100) is below a certain number of revolutions.

Accordingly, in the present invention, the defrosting control (defrosting mode) is performed by a method of maintaining the operating dehumidification mode while maintaining the upper limit of the number of rotations of the compressor 100 when the evaporator 160 is conceived during the dehumidification mode operation .

Here, it is preferable that the upper limit of the number of rotations of the compressor 100 during the defrost control (defrost mode) is set to be smaller than the number of rotations of the compressor 100 at the time when the evaporation of the evaporator 160 occurs.

At this time, the upper limit of the number of rotations of the compressor 100 is regulated to 4500 to 5000 RPM so that the defrosting of the evaporator 160 can be delayed and defrosted while maintaining the performance of the dehumidification mode as much as possible in the defrost control (defrost mode) desirable.

Of course, the value of 4500 ~ 5000 RPM may be changed according to the type, capacity or purpose of the compressor 100. [

9 is a graph showing a case where the number of revolutions of the compressor is regulated when the evaporator is concealed during the dehumidification mode operation. As shown in FIG. 9, at the conception of the evaporator 160, (Defrost mode) by regulating the upper limit of the number of revolutions of the compressor 100 to 5,000 RPM.

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.

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, When the evaporator 160 is frozen in this process, the control unit performs the defrosting control (defrosting mode) for restricting the upper limit value of the number of revolutions of the compressor 100 while maintaining the dehumidification mode during operation The evaporation of the evaporator 160 can be delayed and defrosted, thereby improving the heating performance and the stability of the system.

Meanwhile, an accumulator 170 is installed on the inlet refrigerant circulation line R 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 may 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 conditioner mode (cooling mode), as shown in FIG. 2, the first bypass line R1 is closed through the first direction switching valve 191, and the second direction switching valve 192 is closed. The second bypass line R2 is also closed, and the third diverter 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 as it exchanges heat with outdoor air, thereby converting the gaseous refrigerant into a liquid refrigerant.

On the other hand, both the indoor heat exchanger 110 and the outdoor heat exchanger 130 is condenser dynamics, but the refrigerant is mainly condensed in the outdoor heat exchanger 130 that exchanges heat with outdoor air.

Subsequently, the refrigerant passing through the outdoor heat exchanger 130 is expanded under reduced pressure in the course of passing through the first expansion means 140 to become a liquid refrigerant having a low temperature and low pressure, 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.

In addition, the second bypass line R2 is closed through the second diverter valve 192, and the expansion line R3 is opened through the third diverter 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 to the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing to the expansion line R3 is the second refrigerant. In the process of passing through the expansion means 120 is expanded under reduced pressure to become a low-temperature low-pressure liquid refrigerant, it is supplied to the outdoor heat exchanger 130 that serves as an evaporator.

The refrigerant supplied to the outdoor heat exchanger 130 passes through a first bypass line R1 by the first direction switching valve 191 after evaporating while exchanging heat with outdoor air. The refrigerant passing through the pass line R1 exchanges heat with the cooling water passing through the cooling water heat exchanger 181b in the course of passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181 to waste heat of the vehicle electrical equipment 200. After recovering, the cycle as described above is recycled 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 passing through the compressor 100, the indoor heat exchanger 110, the second expansion means 120, and the outdoor heat exchanger 130 is transferred to the first bypass line R1 by the first direction switching valve 191. In this case, some of the refrigerant passing through the first bypass line (R1) passes through the refrigerant heat exchanger (181a) of the water-cooled heat exchanger (181). Heat exchange with the passing coolant to recover the waste heat of the vehicle electrical equipment 200 is evaporated, a part is supplied to the evaporator 160 through the branch line (R4) to exchange heat with the air flowing in the air conditioning case 150 It will evaporate in 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 concealing means during the dehumidification mode operation of the first heating mode, The upper limit value of the number of revolutions of the compressor 100 is controlled to be equal to or lower than a predetermined number of revolutions to prevent the evaporator 160 from being concealed.

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 to the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing to the expansion line R3 is the second refrigerant. In the process of passing through the expansion means 120 is expanded under reduced pressure to become a low-temperature low-pressure liquid refrigerant, it is supplied to the outdoor heat exchanger 130 that serves 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, A part of 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 course of passing through the refrigerant heat exchanging part 181a of the water-cooling type heat exchanger 181, And a part thereof is supplied to the evaporator 160 through the branch line R4 and evaporated in the course of heat exchange with the air flowing inside the air conditioning case 150. [

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.

Further, since the upper limit value of the number of revolutions of the compressor 100 is regulated to be equal to or less than a predetermined number of revolutions to prevent the evaporation of the evaporator 160 through the defrosting control of the controller, the refrigerant flow rate circulating through the system is reduced, The refrigerant pressure and the temperature of the system are increased, and the evaporation of the evaporator 160 is delayed and defrosted.

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 to the expansion line R3 through the third direction switching valve 193, and the refrigerant flowing to the expansion line R3 is the second refrigerant. After expanding under reduced pressure in the course of passing through the expansion means 120 to become a low-temperature low-pressure liquid refrigerant, and flows to the second bypass line (R2) to bypass the outdoor heat exchanger (130).

Thereafter, the refrigerant passing through the second bypass line R2 passes through the first bypass line R1 by the first direction switching valve 191, where the first bypass line R1 is used. The refrigerant passing through the heat exchange with the cooling water passing through the cooling water heat exchanger (181b) in the process of passing through the refrigerant heat exchanger (181a) of the water-cooled heat exchanger (181) to recover the waste heat of the vehicle electronics (200) As it flows into the compressor 100, the cycle as described above is recycled.

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 parts 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 passing through the compressor 100, the indoor heat exchanger 110, the second expansion means 120, and the second bypass line R2 is transferred to the first bypass line by the first diverter valve 191. In this case, some of the refrigerant passing through the first bypass line R1 passes through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181. Heat exchange with the cooling water passing through the e) is evaporated while recovering the waste heat of the vehicle electrical equipment 200, a part is supplied to the evaporator 160 through the branch line (R4) and the air flowing in the air conditioning case 150 and It will evaporate during the heat exchange 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.

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 which operates during the operation of the evaporation device 160 when the dehumidification mode is activated during the dehumidification mode operation of the second heating mode, The upper limit value of the number of revolutions of the compressor 100 is controlled to be equal to or lower than a predetermined number of revolutions to prevent the evaporator 160 from being concealed.

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, A part of the refrigerant passing through the heat exchanger 181 is heat-exchanged with the cooling water passing through the cooling water heat exchanger 181b in the process of passing through the refrigerant heat exchanger 181a of the water-cooled heat exchanger 181 to recover the waste heat of the vehicle electrical appliance 200, And a part thereof is supplied to the evaporator 160 through the branch line R4 and evaporated in the process of heat exchange with the air flowing in the air conditioning case 150. [

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.

In addition, since the upper limit value of the number of revolutions of the compressor 100 is regulated to be equal to or lower than a predetermined number of revolutions to prevent the evaporation of the evaporator 160 through the defrosting control of the controller, the refrigerant flow rate circulating through the system is reduced, The refrigerant pressure and the temperature of the system are increased, and the evaporation of the evaporator 160 is delayed and defrosted.

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: electronics
R: refrigerant circulation line R1: first bypass line
R2: second bypass line R3: inflation line
R4: Branch Line

Claims (6)

Installed on the refrigerant circulation line (R), respectively, the compressor 100 for compressing and discharging the refrigerant, and is installed in the air conditioning case 150 is discharged from the air in the air conditioning case 150 and the compressor 100 An indoor heat exchanger (110) for exchanging the refrigerant, an evaporator (160) installed inside the air conditioning case (150) for exchanging air in the air conditioning case (150) and the refrigerant supplied to the compressor (100), and Is installed outside the air conditioning case 150, the outdoor heat exchanger 130 for heat exchange between the refrigerant circulating the refrigerant circulation line (R) and the outdoor air, and the refrigerant circulation line (R) on the inlet side of the evaporator (160) Second expansion means installed on the first expansion means 140 to expand the refrigerant and on the refrigerant circulation line R between the indoor heat exchanger 110 and the outdoor heat exchanger 130 to expand the refrigerant. In a vehicle heat pump system comprising a (120),
The refrigerant circulating through the refrigerant circulation line R is installed to connect the inlet refrigerant circulation line R of the first expansion means 140 and the outlet 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,
A second bypass is installed to connect the inlet and 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. 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 160), and when the evaporator (160) is conceived from the conception recognition means during dehumidification mode operation of the heat pump mode for dehumidifying the inside of the vehicle, the upper limit value of the number of revolutions of the compressor (100) Is controlled so as to be equal to or less than a predetermined number of rotations to prevent concealment of the combustion chamber (160). The method of claim 1,
Wherein the upper limit value of the number of rotations of the compressor (100) is set to be smaller than the number of rotations of the compressor (100) at the time when the evaporation of the evaporator (160) occurs. The method of 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 of 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 a refrigerant heat exchanger through which the refrigerant flowing through the first bypass line R1 flows to supply the waste heat of the vehicle electronics 200 to the refrigerant flowing through the first bypass line R1. A water-cooled heat exchanger 181 including a portion 181a and a coolant heat exchanger 181b provided at one side of the refrigerant heat exchanger 181a and having a coolant circulating in the vehicle electrical equipment 200 flows therethrough. Vehicle heat pump system, characterized in that made. 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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