JP2003034114A - Air-conditioning device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a stable temperature adjusting characteristic by preventing the direction of a flow of air guided to a mixing area without regard to the existence of an auxiliary heater while preventing enlargement of an air- conditioning casing in an air-conditioning device in which a wall surface is formed along the end surface of the ventilation part of a heat exchanger in the downstream side of the heat exchanger for heating and the auxiliary heater can be disposed between the heat exchanger for heating and the wall surface. SOLUTION: The area of the end surface of the ventilation part of the auxiliary heater 22 is smaller than that of the end surface of the ventilation part of a heater core 5, and the auxiliary heater 22 is disposed at such a position between the heater core 5 and a partition wall 17 as avoiding the side near the mixing area 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner in which an auxiliary heater can be arranged on the downstream side of a heating heat exchanger, if necessary, and more particularly, to pass air through the heating heat exchanger. The present invention relates to a vehicle air conditioner in which a wall portion provided along an end surface of a ventilation portion of a heating heat exchanger guides the air to a mixing area.

[0002]

2. Description of the Related Art In an air conditioner mounted on a vehicle,
Many use a heat exchanger for heating that uses engine cooling water, but in such vehicles, due to improvements in engine combustion efficiency, etc., sufficient heating capacity may not be obtained, Also, for vehicles produced for cold regions, it is necessary to increase the heating capacity, so
It is required to be able to add an auxiliary heater as needed.

Therefore, in the prior art, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-183206, an auxiliary heater (PTC heater 14) is arranged on the downstream side of the heater core, and the air passing through the heater core is assisted by this auxiliary heater. A configuration in which a heater can be used for further heating has been considered.

[0004]

However, the above-described structure is used for the air conditioner for a vehicle placed in the center, that is, for example, in the center console of a vehicle, such as a blower, an evaporator, and a heater core, as disclosed in JP-A-11-11135. Air conditioners such as air conditioners are centrally arranged to allow air to flow from the front side to the rear side of the vehicle inside the air conditioning case. Despite the request I want to make,
Since the auxiliary heater has to be arranged on the rear side (vehicle compartment side) of the heater core, the following inconvenience occurs.

That is, in the vehicle air conditioner as described above, as shown in FIG. 4 (a), the cooling heat exchanger α is used.
Behind the heating heat exchanger β arranged on the downstream side of the vehicle (cabin side)
Is provided with a wall surface γ along the end surface of the ventilation part of the heat exchanger, and the air passing through the heating heat exchanger β is sent upward along the wall surface γ and provided on the downstream side of the air mix door δ. Since it is led to the mixed area ε,
As shown in (b), the auxiliary heater ζ is replaced with the heating heat exchanger β.
If it is installed at the rear of the, the passage that was previously secured between the heating heat exchanger β and the wall surface γ becomes narrower, leading to an increase in ventilation resistance and the flow direction of the air guided to the mixing area ε. Changes and the temperature control characteristics change. In order to avoid this point, it is possible to secure a large space between the heating heat exchanger β and the wall surface γ, but with such a configuration, the dimension of the air conditioning case in the front-rear direction is reduced. The size becomes large and the mountability is deteriorated.

Therefore, in the present invention, a wall surface is provided downstream of the heating heat exchanger along the end face of the ventilation portion of the heating heat exchanger, such as in a center-mounted vehicle air conditioner. In a vehicle air conditioner in which an auxiliary heater can be installed between the heat exchanger and the wall surface, the auxiliary heater is installed in the mixing area regardless of whether the auxiliary heater is installed or not while avoiding an increase in the size of the air conditioning case. It is an object of the present invention to eliminate the change in the flow direction of blown air and to obtain stable temperature control characteristics.

[0007]

In order to achieve the above object, an air conditioner for a vehicle according to the present invention is provided with a blowing means for blowing air through an air conditioning case, and the air conditioning means arranged in the air conditioning case. A cooling heat exchanger that cools the air introduced into the case, and a heating heat exchanger that is arranged in the air conditioning case and is arranged on the downstream side of the cooling heat exchanger,
A cool air passage for guiding the air passing through the cooling heat exchanger to the downstream side by bypassing the heating heat exchanger, and a warm air passage for guiding the air passing through the heating heat exchanger to the downstream side, A mixing area for mixing the air flowing through the cold air passage and the air flowing through the warm air passage, and an auxiliary heater arranged as necessary in the warm air passage, and the hot air passage It is formed between the heating heat exchanger and a wall portion provided along the end surface of the ventilation part of the heating heat exchanger, and the passing air of the heating heat exchanger is formed by the wall portion. In the configuration in which the auxiliary heating device is configured to lead to the heating device, the area of the end surface of the ventilation portion of the auxiliary heater is made smaller than the area of the end surface of the ventilation portion of the heating heat exchanger, and The mixing area between the exchanger and the wall It is characterized in that so as to disposed in a portion avoiding the side close (Claim 1).

Therefore, the auxiliary heater is made smaller than the heating heat exchanger, and is arranged downstream of the heating heat exchanger so as to avoid a portion close to the mixing area. On the downstream side of the heating heat exchanger close to, it is possible to secure the same passage area as when the auxiliary heater is not installed, and it is possible to introduce it to the mixing area without increasing the size of the air conditioning case. It is possible to suppress the change in the flow direction of the blown air.

Further, since it is necessary to secure a passage area behind the heating heat exchanger near the mixing area, the portion of the heating heat exchanger which does not face the auxiliary heater is provided on the side near the mixing area. It is desirable to form it larger than the opposite side (claim 2).

Further, in order to suppress a decrease in air flow rate due to an increase in ventilation resistance within an allowable limit, the distance between the end faces of the heating heat exchanger and the auxiliary heater on the ventilation outlet side is set to the heating heat exchanger. The distance between the wall of the auxiliary heater and the wall of the auxiliary heater can be set to be less than half the distance between the wall and the wall. %
It may be set as follows (claim 4).

The above-described structure is particularly useful in a structure in which a flow path for flowing air from the front to the rear of the vehicle is formed in the air conditioning case, such as a vehicle air conditioner placed at the center. (Claim 5).

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a center-standing type air conditioning unit 1 mounted in a center console section of a vehicle is shown. The air conditioning unit 1 is arranged closer to the vehicle compartment than a partition plate that divides the engine room and the vehicle compartment, which is provided on the left side of the drawing, from the air conditioning case 2
In addition, the blower 3, the evaporator 4, the heater core 5 and the like are housed at substantially the same position in the vehicle width direction, and the inside air and the outside air are introduced into the air conditioning case through an intake portion (not shown) provided facing the blower 3. It is supposed to do.

In this example, the evaporator 4 is arranged below the blower 3 on the downstream side, and the heater core 5 is arranged further downstream from the evaporator 4. The evaporator 4 and the heater core 5 are arranged in a staggered manner in the front-rear direction of the air conditioning case 2, and the heater core 5 is arranged behind the evaporator 4 in the air conditioning case 2 (on the passenger compartment side). There is.

The heater core 5 is provided so as to face the lower half of the evaporator 4, and the heater core 5 is provided.
A cold air passage 6 that guides the air passing through the evaporator 4 to the downstream side by bypassing the heater core 5 is formed above. Further, a warm air passage 7 for guiding the air passing through the heater core 5 to the downstream side is formed from the rear side of the heater core 5 toward the upper side.

Above the heater core 5, an air mix door 8 for adjusting the ratio of the air flowing through the cold air passage 6 to the air flowing through the hot air passage 7 is arranged. The air mix door 8 is composed of a butterfly type plate door, and is arranged from the position where the cold air passage 6 is fully closed to the hot air passage 7
It is designed to rotate to the position where
The warm air passage 7 is fully opened when the cold air passage 6 is fully closed, and the cold air passage 6 is fully opened when the warm air passage 7 is fully closed.

A mixing area 9 for mixing the air passing through the cool air passage 6 and the air passing through the warm air passage 7 is formed on the downstream side of the air mix door 8. On the downstream side, a center vent outlet 10 for extracting temperature-controlled air, a defrost outlet 1
1, a side vent outlet 12, a foot outlet 13, and a rear foot outlet 14 are provided.

The center vent outlets 10 are formed on both sides of an upper portion of a side wall 16 of the air conditioning case 2 facing the vehicle compartment side so as to face the air conditioning passage 15 formed above the air mix door 8. 11 and the side vent outlet 12 are formed in the upper part of the air conditioning case 2 located at the most downstream end of the air conditioning passage 15. In addition, the foot outlet 13 faces the middle of the air conditioning passage 15 and the air conditioning case 2
Are formed on both left and right side walls. Further, the rear foot outlet 14 is formed in a lower portion of a side wall 16 of the air conditioning case 2 facing the vehicle compartment side, and is formed from the middle to the lower portion of the air conditioning case 2 along the side wall 16 facing the vehicle compartment side. A rear foot outlet passage 18 defined by the partition wall 17 communicates with a downstream portion of the air mix door 8. By this partition wall 17, the heater core 5
A wall portion standing upright along the outlet side end face of the ventilation portion of the heater core 5 is formed in the rear of the heater core 5, and the warm air passage 7 is defined between the heater core 5 and the air passing through the heater core 5. The flow is changed upward so that this air is guided to the mixing area 9 through the air mixing door 8.

The amount of air supplied to the foot outlet 13 and the rear foot outlet 14 is adjusted by a drum-shaped mode door 20 arranged above the air mix door 8 and the center vent is provided. Exit 1
0, defrost outlet 11 and side vent outlet 1
The amount of air supplied to the No. 2 is adjusted by the differential vent mode doors 21 and 22 formed of plate doors.

Therefore, the air sent from the blower 3 is cooled when passing through the evaporator 4, and the air mix door 8 adjusts the ratio between the air flowing through the heater core 5 and the air flowing by-passing. After being appropriately mixed in the mixing area 9 on the downstream side of the mix door 8, the mixture is blown out from an outlet opened in accordance with the blowout mode. A flow path through which air flows toward the rear side is formed.

By the way, in the above-mentioned structure, the auxiliary heater 22 is detachably arranged between the heater core 5 and the partition wall 17 which constitute the hot air passage 7. The auxiliary heater 22 is composed of an electric heater or the like, and the area of the end surface of the ventilation portion is smaller than the area of the end surface of the ventilation portion of the heater core 5, and the auxiliary core 22 and the partition wall 17 are separated from each other. It is arranged in a portion of the space (warm air passage 7) that is away from the side close to the mixing area 9 of the heater core 5.

From this point, from the evaporator 4 to the mixing area 9
2 is a schematic configuration diagram showing the parts up to
The auxiliary heater 22 is juxtaposed in close proximity to the heater core 5 so as to avoid a portion surrounded by a broken line behind the heater core 5. The portion of the heater core 5 not facing the auxiliary heater 22 is closer to the mixing area 9 (heater core 5
The avoidance portion indicated by M in the upper side of the drawing is formed larger than the opposite side (the avoidance portion indicated by L in the lower side of the heater core 5), and as a whole, the auxiliary portion is formed. The heater 22 is arranged so as to be shifted downward from the center of the heater core 5.

The distance D between the heater core 5 and the partition wall 17
Is not actually constant, but at least the auxiliary heater 2
In the upper part of 2, the distance C between the outlet side end faces of the ventilation portions of the heater core 5 and the auxiliary heater 22 is set to be half or less of the distance D between the heater core 5 and the partition wall 17. Further, the dimension A of the auxiliary heater 22 in the direction along the partition wall 17 is set to about 70% or less of the dimension B of the heater core 5 in the same direction. This is shown in Figure 3.
This is because it was confirmed by experiments that, when the auxiliary heater 22 is larger than about 70% of the size of the heater core 5, the decrease in the air volume becomes remarkable beyond the allowable limit (about 15%) as shown in FIG. .

Therefore, as described above, the heater core 5
In the case where a partition wall 17 is erected on the downstream side of the heater core 5 along the end surface of the ventilation portion of the heater core 5 and the auxiliary heater 22 is disposed between them, the end surface of the ventilation portion of the auxiliary heater 22 is set to the ventilation portion of the heater core 5. Since the auxiliary heater 22 is made smaller than the end surface of the heater core 5, and the auxiliary heater 22 is arranged in a portion of the heater core 5 and the partition wall 17 that is away from the side close to the mixing area 9 of the heater core 5, The passage area behind the heater core 5 close to the heater core can be kept constant regardless of the presence or absence of the auxiliary heater 22, and the flow direction of the air guided from the warm air passage 7 to the mixing area 9 is changed by the addition of the auxiliary heater. It will not be lost. Therefore, it is possible to avoid the inconvenience that the mixed state with the air from the cold air passage 6 changes due to the change in the flow direction of the air flowing through the hot air passage 7 and the temperature control characteristic is changed.

Moreover, since the flow direction of the air guided from the warm air passage 7 to the mixing area 9 is not changed even if the auxiliary heater 22 is mounted, the partition wall is provided to secure the space between the heater core 5 and the partition wall 17. It is not necessary to consider moving the air conditioner rearward, and the air conditioning case 2 can be downsized. In addition, since the portion of the rear side of the heater core 5 that the auxiliary heater 22 does not face is formed to be large on the side close to the mixing area 9, the auxiliary heater 22 faces the heater core 5 and the auxiliary heater 22 faces the mixing area 9. The rear side of the heater core 5 can be widely opened on the near side, and a predetermined heating capacity can be secured, and
It becomes possible to maintain a predetermined temperature control characteristic.

Further, the distance C between the end faces of the heater core 5 and the auxiliary heater 22 on the ventilation outlet side is defined as follows.
Since the distance is set to be half or less of the distance D between the partition wall 17 and the partition wall 17, it is possible to secure an air flow path for the air that has passed through the auxiliary heater 22 and avoid an increase in ventilation resistance. Furthermore, the dimension of the auxiliary heater 22 in the direction along the partition wall 17 is about 70% of the dimension of the heater core 5 in the same direction.
Since the setting is made as follows, it is possible to reduce the decrease in the air volume guided to the mixing area 9.

In the above structure, the heater core 5
The example in which the wall portion standing upright in the rear of the vehicle is constituted by the partition wall 17 is shown. However, the above-described partition wall 17 does not exist, and the wall portion standing upright in the rear of the heater core 5 with the side wall 16 facing the vehicle interior side. Also in the case where the above is configured, it is possible to obtain the same operational effect by adopting the same configuration as described above.

Further, the wall portion along the end face of the ventilation portion of the heater core 5 does not necessarily have to be parallel to the heater core 5, and it may be erected at a predetermined angle with respect to the heater core 5. Well, here, the wall portion along the end face of the ventilation portion means a wall surface that is erected so that the passage area of the warm air passage 7 is determined by the distance between the heater core 5 and the wall portion. It suffices that the flow direction of the air that has passed through the heater core 5 is changed immediately after the heater core. Further, the wall portion may be formed integrally with the air conditioning case 2 or may be formed separately.

[0028]

As described above, in the vehicle air conditioner according to the present invention, the wall portion provided on the downstream side of the heating heat exchanger along the end surface of the ventilation portion of the heating heat exchanger. When the warm air passage that allows the auxiliary heater to be arranged is formed between the auxiliary heater and the heater, the area of the end surface of the ventilation portion of the auxiliary heater is made smaller than the area of the end surface of the ventilation portion of the heating heat exchanger. Along with this, the auxiliary heater is arranged at a location near the mixing area, avoiding the downstream side of the heating heat exchanger, so that the auxiliary heater is mounted on the side of the heating heat exchanger near the mixing area. It is possible to secure the same passage area as in the case where the air conditioning case is not installed, and to keep the flow direction of the air guided to the mixing area constant regardless of whether or not the auxiliary heater is installed while avoiding the enlargement of the air conditioning case. And maintain stable temperature control characteristics. It is possible.

If the portion of the heat exchanger for heating which does not face the auxiliary heater is formed to be larger on the side closer to the mixing area than on the side opposite thereto, the auxiliary heater will not be heated by the heating heat. While facing the exchanger, it becomes possible to secure a sufficient passage area behind the heating heat exchanger near the mixing area, so that a predetermined heating capacity can be secured and a predetermined temperature control characteristic can be maintained. It will be easy.

Further, the distance between the end faces of the heating heat exchanger and the auxiliary heater on the ventilation outlet side may be set to half or less of the distance between the heating heat exchanger and the wall portion,
If the dimension along the wall of the auxiliary heater is set to about 70% or less of the dimension of the heating heat exchanger in the same direction, the decrease in air flow due to the increase in ventilation resistance is within the allowable limit. It becomes possible to suppress.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a vehicle air conditioner according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of a portion from an air mix door to a mixing area of a vehicle air conditioner according to the present invention.

FIG. 3 is a characteristic diagram showing the relationship between the ratio of the dimension A in the direction along the wall of the auxiliary heater and the dimension B in the same direction of the heater core, and the air flow reduction rate.

FIG. 4 is a diagram for explaining an inconvenience caused by a conventional configuration.

[Explanation of symbols]

2 air conditioning case 3 blower 4 evaporator 5 heater core 6 cold air passage 7 hot air passage 8 air mix doors 9 mixed areas 17 partitions 22 Auxiliary heater

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Tsuzuki             39, Higashihara, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture               Zexel Valeo Climate Co., Ltd.             In control (72) Inventor Masayuki Murase             39, Higashihara, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture               Zexel Valeo Climate Co., Ltd.             In control F-term (reference) 3L011 BA01 BP02

Claims (5)

[Claims] 1. A blower unit for blowing air through an air conditioning case, a cooling heat exchanger arranged in the air conditioning case for cooling air introduced into the air conditioning case, and an air conditioning case in the air conditioning case. A heating heat exchanger that is arranged downstream of the cooling heat exchanger, and cool air that guides the air that has passed through the cooling heat exchanger to the downstream side by bypassing the heating heat exchanger. A passage, a warm air passage that guides air that has passed through the heating heat exchanger to a downstream side, a mixing area that mixes air flowing through the cold air passage and air flowing through the warm air passage, An auxiliary heater arranged in the warm air passage as needed, and the warm air passage is provided with the heating heat exchanger and a wall portion provided along an end surface of a ventilation portion of the heating heat exchanger. Formed between the wall and the wall, to allow the air passing through the heat exchanger for heating to pass through. In a vehicle air conditioner adapted to lead to the mixing area, the area of the end surface of the ventilation portion of the auxiliary heater is made smaller than the area of the end surface of the ventilation portion of the heating heat exchanger, and the auxiliary heater The air conditioner for a vehicle, characterized in that it is disposed between the heating heat exchanger and the wall portion, avoiding a side close to the mixing area. 2. The portion of the heating heat exchanger not facing the auxiliary heater is formed so that the side closer to the mixing area is larger than the opposite side. The vehicle air conditioner described. 3. The distance between the outlet side end faces of the ventilation parts of the heating heat exchanger and the auxiliary heater is set to half or less of the distance between the heating heat exchanger and the wall portion. The vehicle air conditioner according to claim 1, wherein 4. The dimension of the auxiliary heater in the direction along the wall is about 70 that of the heating heat exchanger in the same direction.
The air conditioner for a vehicle according to claim 1, wherein the air conditioner is set to be not more than%. 5. The air conditioner for a vehicle according to claim 1, wherein a flow path for allowing air to flow from a front side to a rear side of the vehicle is formed in the air conditioning case.