阅读说明：本技术 车辆用空调装置 (Air conditioner for vehicle ) 是由 韩仲万 金斗勋 金灦奎 安暻周 于 2019-06-17 设计创作，主要内容包括：本发明公开一种车辆用空调装置。本发明提供一种如下的车辆用空调装置：包括导墙,该导墙在加热器芯与电热器之间,从上述加热器芯的上侧方向向下侧方向突出到与上述电热器的一部分重叠的长度为止,将通过了上述加热器芯的空气引导至上述电热器,由此提高电热器的效率的同时显著地加大从空气排出口排出的空气量,且能够容易地控制排出风量。(The invention discloses an air conditioner for a vehicle. The present invention provides an air conditioner for a vehicle, comprising: the air heater includes a guide wall which is provided between a heater core and an electric heater and protrudes from an upper side direction to a lower side direction of the heater core to a length overlapping a part of the electric heater, and guides air passing through the heater core to the electric heater, thereby improving efficiency of the electric heater, remarkably increasing an amount of air discharged from an air outlet, and easily controlling a discharge air volume.)

1. An air conditioning device for a vehicle, comprising: an air conditioning casing (110) which is internally provided with an air flow path for sending the air supplied by the air supply unit to an air outlet (112); an evaporator (101), a heater core (102), and an electric heater (105) which are provided in the air conditioning casing (110) in this order along the air flow direction,

the air conditioner for a vehicle is characterized by comprising:

and a guide wall (200) which is provided between the heater core (102) and the electric heater (105), and which protrudes from the upper side direction of the heater core (102) to the lower side direction to a length that overlaps a part of the electric heater (105), and which guides the air that has passed through the heater core (102) to the electric heater (105).

2. An air conditioning device for a vehicle according to claim 1,

the air conditioner for a vehicle has an arrangement angle (A) of 5 degrees or more and 30 degrees or less with respect to the longitudinal direction of the heater core (102) and the longitudinal direction of the electric heater (105).

3. An air conditioning device for a vehicle according to claim 1,

the heater core (102) is separated from the electric heater (105) to form a flow path space (B).

4. An air conditioning device for a vehicle according to claim 3,

the width of the flow path space (B) is 5mm to 30 mm.

5. An air conditioning device for a vehicle according to claim 3,

a part of the air passing through the heat generating part of the heater core (102) passes through the heat generating part of the electric heater (105),

the other part of the air passing through the heat generating part of the heater core (102) bypasses the electric heater (105), flows through the flow path space (B), and then joins the air passing through the heat generating part of the electric heater (105).

6. An air conditioning device for a vehicle according to claim 1,

the guide wall (200) is disposed opposite to the heat generating portion (102-2) of the heater core (102) and the heat generating portion of the electric heater (105).

7. An air conditioning device for a vehicle according to claim 2,

the guide wall (200) is formed on the heater core (102) and the electric heater (105) having the arrangement angle (A) on the side where the heater core (102) and the electric heater (105) are arranged close to each other.

8. An air conditioning device for a vehicle according to claim 7,

the end of the guide wall (200) is formed near the heater core (102).

9. An air conditioning device for a vehicle according to claim 1,

the guide wall (200) is formed by integrally extending a support wall of an upper tank part (102-1) supporting the heater core (102) in a downward direction.

10. An air conditioning device for a vehicle according to claim 9,

the guide wall (200) extends obliquely toward the heater core (102) as it approaches the lower portion, and the width between the guide wall (200) and the electric heater (105) increases as it approaches the end portion of the guide wall (200).

11. An air conditioning device for a vehicle according to claim 2,

the width between the heater core (102) and the electric heater (105) is formed to be narrow at the upper part and gradually wider as approaching the lower part.

12. An air conditioning device for a vehicle according to claim 3,

the flow path space (B) is formed above the heater core (102) and the electric heater (105).

13. An air conditioning device for a vehicle according to claim 3,

the flow path space (B) is formed by a gap between the guide wall (200) and the electric heater (105).

14. An air conditioning device for a vehicle according to claim 1,

the upper end of the electric heater (105) is separated from the heater core (102) by a guide wall (200), and the lower end of the electric heater (105) is separated from the bottom surface of the air-conditioning case (110).

Technical Field

The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle having an electric heater, in which the volume of air that exchanges heat with the electric heater is improved.

Background

In general, the purpose of providing an air conditioner for a vehicle is as follows: the front and rear visual fields of the driver are ensured by cooling or heating the interior of the vehicle in summer or winter, or by removing frost or the like present on the windshield in rainy days or winter.

Such an air conditioner for a vehicle selectively flows internal air or external air, which flows into a vehicle interior by a Blower (Blower), to an Evaporator (Evaporator) through which a refrigerant flows or a Heater Core (Heater Core) through which cooling water of a vehicle engine flows, exchanges heat, and then is distributed into the vehicle interior in a cold or hot state through a Defrost Vent (Defrost Vent), a Face Vent (Face Vent), and a Floor Vent (Floor Vent) which communicate with respective portions in the vehicle interior, thereby cooling or heating the vehicle interior.

Such air conditioners may be classified into Three-Piece (Three-Piece Type) air conditioners in which a blower, an evaporator, and a heater core are independently formed, Semi-Center-mounted (Semi-Center-Mounting Type) air conditioners in which an evaporator and a heater core are integrally provided in one case, and Center-mounted (Center-Mounting Type) air conditioners in which a blower, an evaporator, and a heater core are integrally provided in one case.

Fig. 1 is a sectional view of a conventional vehicle air conditioner including a PTC heater.

As shown in fig. 1, a conventional vehicle air conditioner provided with a PTC heater includes: an air conditioning casing 10 having an air flow inlet 11 formed on an inlet side and a plurality of air discharge ports 12 formed on an outlet side; an evaporator 1 and a heater core 2 provided inside the air conditioning casing 10; PTC heaters 5 provided in parallel on one side of the heater core 2; a temperature control door 20 provided between the evaporator 1 and the heater core 2 to control a temperature; and a mode door 30 provided at the air outlet 12 for adjusting an opening degree of the air outlet 12 according to an air-conditioning mode.

In addition, the air conditioner further includes various adjustment switches as follows: a temperature adjustment switch (not shown) that is controlled by various adjustment switches (not shown) provided in a controller of an Instrument Panel (Instrument Panel) of the vehicle, and that controls an actuator that drives the temperature adjustment door 20 to adjust the temperature; a mode switch (not shown) for controlling an actuator for driving the mode door 30 to operate an air-conditioning mode; an air volume switch (not shown) for adjusting the air volume; and an inside/outside air switch (not shown) for selecting inside air, outside air, and the like.

In winter, the heat of the cooling water in the engine, which is lowered in temperature by the influence of the outside air, cannot be used in the initial stage of the start-up, and therefore, there is a disadvantage that the interior of the vehicle cannot be immediately heated. In order to solve such a drawback, the air conditioner is provided with a PTC (Positive Temperature Coefficient) heater 5 as an auxiliary heating unit to heat the vehicle interior at the initial start-up stage.

In recent years, as for automobiles, hybrid automobiles and electric automobiles, which are another type of automobiles in which environmental protection and fuel economy are considered, have been actively developed in addition to automobiles using combustion engines. In such a hybrid vehicle or electric vehicle, a PTC heater 5 is additionally provided inside the air conditioner.

As shown in fig. 2, in the PTC heater 5, as one type of electric heater, a plurality of PTC elements 7 are provided inside a heater case 6, and a plurality of heat radiating fins 8 are provided around each PTC element 7 to form a heat transfer portion, so that heat is exchanged between heat generated by the PTC elements 7 and air passing through the heat radiating fins 8.

In addition, as for the on/off control of the PTC heater 5, a signal control method by PWM (Pulse Width Modulation) by the control section 9 can be applied. The PWM method is a method of changing a duty ratio (duty rate) of a pulse in accordance with the magnitude of a modulation signal and controlling the pulse as one of pulse modulation methods. That is, in the PWM control, the control value is adjusted by adjusting the duty ratio, and at this time, the average value of the pulse signal is changed by changing the duty ratio of the signal, and such average value is used as the control signal value.

In the case of a general air conditioner, a small low-voltage PTC heater is used as the PTC heater 5, and in the case of an electric or hybrid vehicle, a large high-voltage PTC heater is used. Such a control portion 9 is divided into a separate type control portion electrically connected to the PTC heater 5 and provided at a different position and an integrated type control portion assembled to the PTC heater 5.

Accordingly, the temperature adjustment door 20 rotates in a direction to open the heater core 2 and the PTC heater 5 in the maximum heating mode, and the temperature adjustment door 20 rotates in a direction to close the PTC heater in the maximum cooling mode.

However, in the case of a conventional air conditioner for a vehicle, the heater core 2 and the PTC heater 5 are arranged in parallel, and the PTC heater 5 is smaller in size than the heater core 2, and an air flow space is provided above and below the PTC heater 5. Thus, for example, in the maximum heating mode, although the air passing through the heater core 2 passes through the PTC heater 5, the air does not pass through the PTC heater 5 but leaks vertically, which may reduce the efficiency of the PTC heater 5.

The PTC heater 5 is mostly turned off after being driven for about 10 to 15 minutes mainly at the initial start-up of the vehicle, and particularly in the case of a hybrid vehicle requiring a continuous operation of the PTC heater 5, there is a problem in that the efficiency of the PTC heater is rapidly reduced.

Fig. 3 is a cross-sectional view of a conventional vehicle air conditioner including a PTC heater.

In view of this, as shown in fig. 3, the conventional air conditioner for a vehicle includes a guide wall 13 that partitions the heater core 2 and the upper side of the PTC heater 5, and blocks the flow of air flowing to the upper side of the PTC heater 5, but the wind pressure rapidly rises at the front end of the evaporator 1, and the wind speed discharged from the vent rapidly increases, and cannot be controlled.

In addition, when the size of the PTC heater 5 is increased to the size of the heater core 2, the cost increase range is very large in accordance with the increase, and therefore, the effective position selection of the PTC heater 5 and the configuration of the surrounding structure are continuously studied.

Disclosure of Invention

Problems to be solved by the invention

In order to solve the conventional problems, the following air conditioning device for a vehicle is provided: the air heater includes a guide wall which is provided between a heater core and an electric heater and protrudes from an upper side direction to a lower side direction of the heater core to a length overlapping a part of the electric heater, and guides air passing through the heater core to the electric heater, thereby improving efficiency of the electric heater, remarkably increasing an amount of air discharged from an air outlet, and easily controlling a discharge air volume.

Means for solving the problems

An air conditioning device for a vehicle according to the present invention includes: an air-conditioning case having an air flow path formed therein to send air supplied by the air supply unit to the air discharge port; an evaporator, a heater core, and an electric heater, which are provided in the air conditioning case in this order along an air flow direction, the air conditioning apparatus for a vehicle is characterized by comprising: and a guide wall protruding from an upper side of the heater core to a lower side thereof between the heater core and the electric heater to a length overlapping a part of the electric heater, for guiding the air passing through the heater core to the electric heater.

In addition, the vehicle air conditioner has an arrangement angle of 5 degrees or more and 30 degrees or less with respect to the longitudinal direction of the heater core and the longitudinal direction of the PTC heater.

The heater core is spaced apart from the electric heater to form a flow path space.

The width of the flow path space is 5mm to 30 mm.

In addition, a part of the air passing through the heat generating portion of the heater core passes through the heat generating portion of the electric heater, and the other part of the air passing through the heat generating portion of the heater core bypasses the electric heater, flows through the flow path space, and then joins the air passing through the heat generating portion of the electric heater.

The guide wall is disposed to face the heating portion of the heater core and the heating portion of the electric heater.

The guide wall is formed on the heater core and the electric heater having a predetermined arrangement angle, on a side where the heater core and the electric heater are arranged close to each other.

The end of the guide wall is formed near the heater core.

The guide wall is integrally formed to extend downward from a support wall supporting the upper tank portion of the heater core.

The guide wall extends obliquely toward the heater core as it approaches the lower portion, and the width between the guide wall and the electric heater increases as it approaches the end portion of the guide wall.

Further, the heater core and the electric heater are formed to have a narrow upper portion and a gradually wider lower portion.

The flow path space is formed above the heater core and the electric heater.

The flow path space is formed by a gap between the guide wall and the electric heater.

The upper end of the electric heater is separated from the heater core by a guide wall, and the lower end of the electric heater is separated from the bottom surface of the air conditioning case.

Effects of the invention

The present invention provides an air conditioner for a vehicle, which can improve the efficiency of an electric heater and remarkably increase the amount of air discharged from an air outlet, and can easily control the amount of discharged air, compared with a conventional air conditioner in which the upper side of the electric heater is closed.

Drawings

Fig. 1 is a sectional view of a conventional vehicle air conditioner including a PTC heater.

Fig. 2 is a perspective view showing a PTC heater applied to the air conditioning device for a vehicle of the present invention.

Fig. 3 is a cross-sectional view of a conventional vehicle air conditioner including a PTC heater.

Fig. 4 is a sectional view showing an air conditioner for a vehicle according to an embodiment of the present invention.

Fig. 5 is an enlarged cross-sectional view of a part of the air conditioner of fig. 4.

Fig. 6 is a partially enlarged perspective view showing a state in which a part of the guide wall is cut away in the vehicle air conditioner of the present invention.

Fig. 7 is a diagram showing velocity distributions in the vicinity of a heater core and an electric heater of an air conditioner according to the present invention.

Fig. 8 is a diagram showing the distribution of wind velocities inside an air conditioner according to the present invention, and an air conditioner in which the upper and lower sides are closed so that air passes only through an electric heater, in a conventional air conditioner, wherein (a) is a diagram showing the air conditioner according to the present invention, and (b) is a diagram showing the conventional air conditioner.

(symbol description)

110: the air-conditioning case 102: heater core

101: evaporator 102-1: tank part

102-2: the heat generating portion 105: electric heater

111: air flow inlet 112: air outlet

120: bypass gate 121: rotating shaft

130: the mode gate 200: guide wall

Detailed Description

The technical structure of the air conditioner for a vehicle will be described in detail below with reference to the accompanying drawings.

Fig. 4 is a sectional view showing an air conditioner for a vehicle according to an embodiment of the present invention.

As shown in fig. 4, the air conditioner for a vehicle according to one embodiment of the present invention includes an air conditioning case 110, an evaporator 101 as a cooling unit, a heater core 102 as a heating unit, and an electric heater 105. The electric heater 105 includes the PTC heater of fig. 2 described in the background art as a broad concept heater that generates heat using electricity.

The air conditioning case 110 has an air flow path formed therein to supply air supplied from an air blowing unit (not shown) to an air outlet 112, an air inlet 111 connected to the air blowing unit formed on an inlet side, and a plurality of air outlets 112 formed on an outlet side to open and close the flow path by a mode door 130. The evaporator 101 and the heating unit are sequentially disposed in the air conditioning case 110 along the air flow direction. The heating means includes a heater core 102 and an electric heater 105.

That is, the air conditioner for a vehicle according to the present invention is applied to an electric vehicle, for example, and includes the electric heater 105 as the heating unit. In this case, the present invention is characterized in that the control of the volume and pressure of the discharged air passing through the electric heater 105 is improved by the structural configuration of the guide wall 200 described later.

In addition, as shown in the configuration of fig. 2, when the electric heater 105 is a PTC heater, heat is supplied or insulated by on/off control of a power supply, and the temperature of the discharged air is linearly controlled to a certain extent by PWM control. Specifically, as an example of the on/off control of the electric heater 105, a signal control method using pwm (pulse Width modulation) by the control unit described in the background art can be applied. The PWM method is a method of changing a duty ratio (duty Rate) of a pulse in accordance with the magnitude of a modulation signal and controlling the PWM method as one of pulse modulation methods. That is, in the PWM control, the control value is adjusted by adjusting the duty ratio, and at this time, the duty ratio of the pulse signal is changed so that the average value of the signal is changed, and such an average value is used as the control signal value.

The air conditioner for a vehicle according to the present invention includes a bypass passage formed between the evaporator 101, which is a cooling unit, and the heater core 102 and the electric heater 105, which are heating units, in the air conditioning case 110, and a bypass door 120 for opening and closing the bypass passage. The bypass flow path does not allow all of the air passing through the evaporator 101 to flow to the heating unit side, but allows a part or all of the air to bypass and not flow to the heating unit side. On the other hand, the bypass door 120 is provided on the bypass flow path so as to be rotatable about the rotary shaft 121, and controls the amount of air passing through the bypass flow path. In the drawings, the rotary shaft 121 of the bypass door 120 is rotatably coupled to one side of the upper portion of the heater core 102, but the position of the rotary shaft 121 of the bypass door 120 is not limited in the present invention. Specifically, the bypass door 120 is disposed on one side of the center of the evaporator 101 and the heating unit.

Fig. 5 is a partially enlarged sectional view of the air conditioner of fig. 4, fig. 6 is a partially enlarged perspective view showing a state in which a part of a guide wall 200 is cut away in the vehicle air conditioner of the present invention, and fig. 7 is a view showing a velocity distribution in the vicinity of a heater core 102 and an electric heater 105 of the air conditioner of the present invention.

As shown in fig. 5 to 7, an air conditioning device for a vehicle according to an embodiment of the present invention includes a heater core 102 and an electric heater 105 arranged in this order along a flow direction of air, and the heater core 102 includes a heat generating portion 102-2 having a heat exchanging portion such as a heat generating sheet to exchange heat with air, and a tank portion 102-1 fixed by vertically surrounding the heat generating portion 102-2. That is, heat exchange of the air flowing in the heat generating portion 102-2 of the heater core 102 with the heater core 102 is performed. Similarly, in the present embodiment, the electric heater 105 may be a PTC heater including a heat generating portion through which air passes to exchange heat.

A part of the air passing through the heat generating portion 102-2 of the heater core 102 exchanges heat by passing through the heat generating portion of the electric heater 105, and the other part of the air passes through the flow path space B on the upper side of the electric heater 105 and bypasses the electric heater 105 on the lower side so as to be guided along the inner wall of the air-conditioning case 110.

In this case, the heater core 102 and the electric heater 105 are formed in a disk shape with a constant thickness, and the arrangement angle a with respect to the longitudinal direction of the heater core 102 and the longitudinal direction of the electric heater 105 is 5 degrees or more and 30 degrees or less. That is, the heater core 102 and the electric heater 105 are disposed at a predetermined disposition angle a inside the air conditioning case 110, and when the disposition angle a is less than 5 degrees, resistance to air flow is generated when air passing through the heat generating portion of the electric heater 105 rises along the inner wall of the air conditioning case 110, and when the disposition angle a exceeds 30 degrees, the space of the air conditioning case 110 is occupied, which causes a problem that the volume of the air conditioning case 110 increases.

That is, in the present invention, the arrangement angle a with respect to the longitudinal direction of the heater core 102 and the longitudinal direction of the electric heater 105 is set to 5 degrees or more and 30 degrees or less, thereby minimizing resistance to air flow passing through the heat generating portions of the heater core 102 and the electric heater 105 and guiding a part of the air to smoothly bypass to the lower side of the heater core 102.

The air conditioner for a vehicle according to an embodiment of the present invention includes a flow path space B in which the heater core 102 and the electric heater 105 form a flow path of air at predetermined intervals in the drawing direction.

On the other hand, in the case where the hot air having passed through the heat generating portion of the heater core 102 passes through the heat generating portion of the electric heater 105 in order to raise the temperature of the air in an auxiliary manner, if the periphery of the heater core 102 is closed in order to more effectively use the electric heater 105 and the air having passed through the heat generating portion of the heater core 102 passes through the heat generating portion of the electric heater 105 as in the related art, a large ventilation resistance is generated in the electric heater 105, so that the amount of air discharged from the air outlet 112 is significantly reduced, and the speed of the air passing through the heat generating portion of the electric heater 105 is increased (see fig. 8), and it is difficult to control the discharge amount. Further, as described in the background art, when the upper side of the electric heater 105 is closed and the lower side is opened, air passing through the heat generating portion of the heater core 102 leaks to the lower side of the electric heater 105, thereby reducing the efficiency of the electric heater 105.

That is, in the present embodiment, in order to solve such a problem, in order to maximize the efficiency of the electric heater 105 and maximize the amount of air discharged from the air discharge port 112, the air passing through the heat generating portion of the heater core 102 is guided to pass through the electric heater 105 by securing the flow path space B by separating the heater core 102 and the electric heater 105 by a predetermined interval, and flowing to the flow path space B on the upper side of the electric heater 105 while flowing to the lower side of the electric heater 105.

In this case, it is preferable that the width of the flow path space B is set to 5mm to 30mm in a case of a general air conditioner. When the width of the flow path space B is less than 5mm, the air flowing into the flow path space B cannot be maintained to a proper degree, and thus the air flowing into the electric heater 105 is reduced, which may cause a reduction in the air volume, and when the width of the flow path space B exceeds 30mm, the air flowing into the flow path space B is excessive, and thus the air passing through the electric heater 105 is reduced, which may cause a reduction in the efficiency of the electric heater 105.

In order to guide the air passing through the heat generating portion of the heater core 102 to the electric heater 105, the air conditioner for a vehicle according to one embodiment of the present invention includes a guide wall 200 between the heater core 102 and the electric heater 105 in the upper direction of the heater core 102 in the drawing, the guide wall projecting in the upper-lower direction of the drawing to a length overlapping a part of the electric heater 105.

Referring to fig. 7, air passing through the upper side of the heater core 102 passes through the guide walls 200 protruding downward, a part of the air flows to the flow path space B, and the rest of the air flows to the heat generating portions of the electric heater 105, thereby improving the efficiency of the electric heater 105. Air passes through the heat generating portion of the electric heater 105, and air is guided to the lower side without the air flow resistance of the electric heater 105. Thus, the vehicle air conditioner according to the present invention can significantly increase the amount of air discharged from the air outlet 112 while improving the efficiency of the electric heater 105, as compared to a conventional air conditioner in which the upper side of the electric heater 105 is closed.

In this case, the air flows along the inner wall of the air-conditioning case 110 to the lower side of the electric heater 105 without air-flow resistance, and joins the air.

More specifically, the guide wall 200 is formed integrally extending in a downward direction at a support wall of the upper tank portion 102-1 that supports the heater core 102. Further, the guide wall 200 extends obliquely toward the heater core 102 as it approaches the lower portion, and the width between the guide wall 200 and the electric heater 105 gradually increases as it approaches the end portion of the guide wall 200.

The width between the heater core 102 and the electric heater 105 is formed such that the upper portion is narrow and gradually becomes wider as it approaches the lower portion. The flow path space B is formed above the heater core 102 and the electric heater 105. Meanwhile, a flow path space B is formed by a gap between the guide wall 200 and the electric heater 105. The upper end of the electric heater 105 is spaced apart from the heater core 102 by a guide wall 200, and the lower end of the electric heater 105 is spaced apart from the bottom surface of the air-conditioning case 110.

That is, the vehicle air conditioner according to the present invention can maximize the efficiency of the electric heater 105 and efficiently perform heating even with a small amount of wind, although the amount of wind discharged from the air outlet 112 may be reduced to some extent as compared to a conventional air conditioner in which the upper side of the electric heater 105 is closed.

In this case, the guide wall 200 is disposed to face the heater core 102 and the electric heater 105. In this case, the guide wall 200 is formed on the heater core 102 and the electric heater 105 having the inclination with respect to each other, at an upper side where the heater core 102 and the electric heater 105 are disposed close to each other. This is because the heater core 102 and the electric heater 105, which are arranged to have an inclination with respect to each other, have a relatively narrow distance from each other on the upper side, and thus may cause an excessive amount of air to flow into the flow path space B due to the wind velocity.

Further, the guide wall 200 has an end portion formed close to the heater core 102. Specifically, when the end of the guide wall 200 is formed closer to the heater core 102, the air flow between the heater core 102 and the guide wall 200 having a relatively short distance is relatively high in the heater core 102 and the electric heater 105 having the inclination, and thus the air flow not passing around the electric heater 105 is increased.

Fig. 8 is a diagram showing the distribution of wind velocities inside the air conditioner in the vehicle air conditioner of the present invention and in the air conditioner in which the upper and lower sides are closed so that air passes only through the electric heater 105, wherein (a) is a diagram showing the vehicle air conditioner of the present invention, and (b) is a diagram showing the conventional air conditioner.

As shown in fig. 8, in the air conditioner for a vehicle according to the present invention, the ratio of air flowing into the electric heater 105 is increased from about 30 to 40% to about 60 to 70% as compared with the conventional air conditioner. That is, in fig. 8b, when the air passing through the heat generating portion of the heater core 102 is designed to pass through only the heat generating portion of the electric heater 105, the air flow resistance of the air passing through the heat generating portion of the heater core 102 and the heat generating portion of the electric heater 105 is increased by almost 25% or more compared to the vehicle air conditioner of the present invention, and the air volume is significantly reduced to about 40 to 60 CMH.

Specifically, when the air is blown from the blower (not shown) to the evaporator 101 at 300CMH (cubicmeter/hour), the pressure at the tip of the evaporator 101 is detected as 478.2Pa in fig. 8a and 636Pa in fig. 8b, and it is found that the ventilation resistance of the conventional air conditioner is increased by about 25% or more as compared with the air conditioner for a vehicle of the present invention. That is, the pressure is increased by the air flow resistance generated when the air sent from the blower passes through the heat generating portion of the heater core 102 and the heat generating portion of the electric heater 105.

Similarly, in the conventional air conditioner for a vehicle, since the air speed is so fast that it cannot be compared with the air speed at the rear end of electric heater 105, it is almost impossible to control the air discharged from air outlet 112.

Although the vehicle air conditioner according to the present invention has been described above with reference to the embodiments shown in the drawings, this is merely an example, and those skilled in the art can implement other embodiments having various modifications and equivalents. Therefore, the true technical scope of the present invention should be defined according to the technical idea of the appended claims.