JPH07266844A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To uniform the distribution of air flow speed passing through a cooling heat exchanger without causting the increase of ventilation resistance. CONSTITUTION:A blower unit 20 is disposed on a cooler unit 30 in the front side of a vehicle to blow from the side of a cooler case 32 into the cooler case 32 in the upstream of a cooling heat exchanger 31 received in the cooler case 32. A plate-like guide plate 33 in the cooler case 32 is uprighted in the blowing direction (direction of an inflow port 32a) of the blower unit 20 over the whole vertical direction of the cooler case 32 on the opposite side to the wall surface formed with the inflow port 32a of the cooler case 32. Also, a resistor 24 of the blower unit 20 is provided on the blow-ward side of the guide plate 33 on the wall surface of the cooler case 32 provided with the guide plate 33.

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.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner, a cooler unit containing a refrigerant evaporator is connected downstream of a blower unit containing a blower, and air sent from the blower passes through the refrigerant evaporator. It is configured like. Here, when the air flow rapidly changes between the blower and the refrigerant evaporator, for example, as shown in FIG. 8, the inlet 110 of the cooler unit 100 is not at a position facing the refrigerant evaporator 200 but at the cooler. When it is provided on the side of the unit 100, the amount of air passing through the refrigerant evaporator 200 becomes uneven. That is, in the case of FIG. 8, the cooler unit 1
The air that has flowed in through the inlet 110 of 00 is going to go straight as it is.
The amount of air passing through 00 is small, and the amount of air passing through the refrigerant evaporator 200 is large at a place distant from the inlet 110.

Therefore, in JP-A-5-85148, as shown in FIGS. 9 and 10, a refrigerant evaporator 200 is provided.
There is disclosed a technique in which a guide plate 300 having a substantially L-shape is installed upstream (upwind) of the air conditioner to make the distribution of the amount of air passing through the refrigerant evaporator 200 uniform.

[0004]

However, in the prior art disclosed in the above publication, the guide plate 300 is the refrigerant evaporator 2.
The resistor 50 that needs to be cooled by blowing air because it is attached to the duct wall surface 400 (see FIG. 9) facing 00.
The mounting position of 0 (or transistor) is the guide plate 300.
There is a problem in that the wind resistance becomes higher and the ventilation resistance increases. The present invention has been made based on the above circumstances, and an object thereof is to achieve uniform wind velocity distribution passing through a cooling unit without increasing ventilation resistance.

[0005]

In order to achieve the above object, the present invention comprises the following technical means for each claim. According to claim 1, a duct that guides air into the vehicle compartment, a cooling unit that is arranged in the duct to cool passing air, and an inside of the duct from a side of the cooling unit upstream of the cooling unit. In a vehicle air conditioner equipped with a blower that sends air to the inside of the duct on the side opposite to the side where the blower is attached with respect to the cooling means, at a portion where the flow velocity of the air blown to the cooling means increases. A shield plate was installed facing the cooling means to block the flow of air.

According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the shielding plate projects in a plate shape from a wall surface of the duct on a side opposite to a side on which the blower is attached, in a blowing direction of the blower. It is set up.

According to a third aspect of the present invention, in the vehicle air conditioner according to the first or second aspect, a space formed between the shield plate and the inner wall surface of the duct on the windward side of the shield plate,
A resistance means for adjusting the rotation speed of the blower is installed.

According to a fourth aspect, in the vehicle air conditioner according to any of the first to third aspects, the shielding plate is formed integrally with the duct.

[0009]

The air blown by the blower is sent from the side of the cooling means to the inside of the duct upstream of the cooling means, and then is bent at a substantially right angle in the duct and sent to the cooling means. At this time, in the duct on the side opposite to the side where the blower is mounted with respect to the cooling means, at a portion where the flow velocity of the air flowing from the blower toward the cooling means is high, the air flow is blocked by the shielding plate installed in the duct. From being
By that amount, a large amount of air will flow to the part where the flow velocity of air is low. As a result, the wind velocity distribution of the air passing through the cooling means can be made uniform.

Further, the shielding plate is installed facing the cooling means at a portion where the flow velocity of air is high, specifically, from the wall surface of the duct on the side opposite to the side where the blower is mounted, facing the blowing direction of the blower. Are projected like a plate. Therefore, it is possible to secure a space for installing the resistance means for adjusting the rotation speed of the blower between the windward side of the shield plate and the inner wall surface of the duct, and install the resistance means in this space. Therefore, it is possible to minimize the increase in ventilation resistance due to the installation of the resistance means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner of the present invention will be described with reference to FIGS. FIG. 1 is an overall schematic diagram of a vehicle air conditioner. Vehicle air conditioner 10 of the present embodiment
Includes a blower unit 20, a cooler unit 30, and a heater unit 40.

The blower unit 20 constitutes a blower means (blower of the present invention) for sending air into the passenger compartment, and comprises a blower case 21, a centrifugal fan 22, and a blower motor 23 (see FIG. 2). The rotation speed of the blower motor 23 is changed by switching the resistor 24 (the resistance means of the present invention) interposed in the power supply circuit.

As shown in FIG. 2, the blower case 21 has an inside air introduction port 21a for introducing air (inside air) inside the vehicle,
An outside air introduction port 21b for introducing outside air (outside air) and a discharge port 21c for discharging blown air are formed, and an inside / outside air switching damper 25 for selectively opening / closing the inside air introduction port 21a and the outside air introduction port 21b. Is provided. The inside / outside air switching damper 25 is driven by driving means (not shown) such as a servo motor or a step motor via a link mechanism not shown. Since the resistor 24 requires cooling by blowing air, the cooler unit 3
It is installed in 0 (described later).

The cooler unit 30 is the blower unit 2
A cooling heat exchanger 31 (cooling means of the present invention) that cools the air sent from 0 and a cooler case 32 that houses this cooling heat exchanger 31 are provided. Cooling heat exchanger 31
Is a refrigerant evaporator of a refrigeration cycle, which cools passing air by heat exchange with a low-temperature low-pressure refrigerant supplied by the operation of a refrigerant compressor (not shown).

The cooler case 32 has an inlet 32a that is hermetically connected to the discharge port 21c of the blower case 21 via a sealing material 50 such as packing, and a flow through which the air cooled by the cooling heat exchanger 31 flows out. An outlet 32b is formed. Further, in the cooler case 32, the cooling heat exchanger 3 is provided.
A guide plate 33 (described later) is provided on the upstream side (upwind side) of 1.

The heater unit 40 is the cooler unit 3
A heating heat exchanger 41 for heating the air sent from 0;
A heater case 42 accommodating the heating heat exchanger 41 is provided. The heat exchanger 41 for heating heats the air passing therethrough by using engine cooling water as a heat source, and the heater case 4
The bypass circuit 43 that bypasses the heat exchanger 41 for heating in 2 (see FIG.
(See) is formed. The proportion of the amount of air passing through the heating heat exchanger 41 and the amount of air passing through the bypass 43 is adjusted by an air mix damper 44, which is a temperature adjusting means mounted in the heater case 42. The air mix damper 44 is driven by driving means (not shown) such as a servo motor or a step motor via a link mechanism not shown.

The heater case 42, together with the cooler case 32, forms a duct for guiding the air sent from the blower unit 20 into the passenger compartment. The heater case 42 is provided at the outlet 32b of the cooler case 32 with a seal material 51 such as packing interposed therebetween. An air inlet 42a that is airtightly connected and an air outlet 42 through which the conditioned air whose temperature is adjusted by the air mix damper 44 flows out.
b, 42c, 42d are formed.

Further, in the heater case 42, blower outlet switching dampers 42e, 42f, 42g for selectively opening and closing the respective outlets 42b, 42c, 42d (see FIGS. 1 and 3).
Is provided. The outlet switching dampers 42e, 42
f and 42g are driven by driving means (not shown) such as a servo motor or step motor via a link mechanism not shown.

The outlet 42b is connected to the cooler case 32.
Is connected to a defroster outlet 52 that opens to the upper surface of the vehicle and blows air toward the window glass of the vehicle through the branch duct 45 (see FIG. 3). The outlet 42c opens to the side of the cooler case 32 (toward the passenger compartment) and communicates with a face outlet 53 that blows air toward the upper body of the occupant via a branch duct 46 (see FIG. 1). . The outlet 42d is open to the lower surface of the cooler case 32 and is connected to a foot outlet 54 that blows out air toward the feet of the occupant through the branch duct 47 (see FIG. 3).

In the vehicle air conditioner 10 of this embodiment, the cooler unit 30 and the heater unit 40 are arranged in the vehicle width direction (see FIG. 1).
Blower unit 2 while it is placed in the left-right direction)
0 is arranged on the vehicle front side (upper side in FIG. 1) of the cooler unit 30. Therefore, the inlet 3 of the cooler case 32
The opening 2a is formed on the vehicle front side wall surface of the cooler case 32 toward the lower side (see FIGS. 1 and 2). For this reason,
The air sent from the blower unit 20 bends at a substantially right angle in the cooler case 32 and is sent to the cooling heat exchanger 31.

The above-mentioned guide plate 33 (shield plate of the present invention)
Is provided in order to make the wind velocity distribution of the air passing through the cooling heat exchanger 31 uniform, and is provided in the cooler case 32 where the flow velocity of the air flow toward the cooling heat exchanger 31 is high. , Is installed so as to block the flow of air. Specifically, the inlet 3 of the cooler case 32 is provided over the entire vertical direction of the cooler case 32 (the vertical direction in FIG. 2).
On the wall surface opposite to the wall surface on which 2a is formed (that is, the side opposite to the installation side of the blower unit 20), the blower unit 2
It is provided upright in a plate shape in the direction of 0 (the direction of the inlet 32a). The guide plate 33 is made of resin integrally molded with the cooler case 32, and is 2 in this embodiment.
It has a plate thickness of mm.

The resistor 24 of the blower unit 20 is shown in FIG.
As shown in FIG.
3 is installed on the wall surface of the cooler case 32. Therefore, since the resistor 24 is arranged at a position facing the discharge port 21c of the blower case 21, it can be cooled by receiving the air blown from the blower unit 20.

Next, the operation of this embodiment will be described. The air sent from the blower unit 20 into the cooler case 32 by the rotation of the blower motor 23 bends in the cooler case 32 at a substantially right angle and is sent to the cooling heat exchanger 31.
Therefore, when the guide plate 33 is not installed,
The wind velocity distribution of the air passing through the cooling heat exchanger 31 becomes non-uniform, and the wind velocity of the air passing through the cooling heat exchanger 31 becomes higher as it is farther from near the inlet 32a of the cooler case 32.

On the other hand, in this embodiment, the guide plate 33 is provided on the part of the cooling heat exchanger 31 where the wind speed is high on the windward side.
The installation of the guide plate 3 prevents the air having a high wind speed from being blown directly to the cooling heat exchanger 31.
Since it collides with the nozzle 3 and flows into a portion where the wind velocity is originally low, the wind velocity distribution of the air passing through the cooling heat exchanger 31 can be made uniform.

Here, the results of measurement of the wind velocity distribution passing through the cooling heat exchanger 31 in the state where the guide plate 33 is not installed and the state where the guide plate 33 is installed are shown in FIGS. 4 and 5. The measurement method is that the exit wind speed of the cooling heat exchanger 31 is measured by a multipoint anemometer.

According to this measurement, it was confirmed that the wind speed was high at the lower right portion of the cooling heat exchanger 31, as shown in FIG. 4, when the guide plate 33 was not installed. On the other hand, in the state where the guide plate 33 was installed, it was confirmed that the wind velocity distribution was uniform as a whole, as shown in FIG. However, each reference symbol in the drawing indicates the following wind velocity range (unit: m / s). A = 0.0 to 0.6, B = 0.6 to 1.2, C = 1.2
-1.8 D = 1.8-2.4, E = 2.4-3.0, F = 3.0
-3.6 G = 3.6-4.2, H = 4.2-4.8, I = 4.8
~ 5.4 J = 5.4 or more

As can be confirmed from the measurement results, by installing the guide plate 33 at a portion where the wind speed is high,
The wind velocity distribution of the air passing through the cooling heat exchanger 31 can be made uniform. As a result, variations in the temperature and the amount of air blown into the vehicle interior can be prevented, and the temperature controllability in the vehicle interior can be improved.

Further, in this embodiment, the guide plate 33 is provided upright on the side opposite to the inlet 32a of the cooler case 32 in the air blowing direction (inlet direction) of the blower unit 20. A space for installing the resistor 24 can be secured between the windshield of the guide plate 33 and the inner wall surface of the cooler case 32. Therefore, by installing the resistor 24 in this space, the resistor 24 can be cooled by the air sent from the blower unit 20, and the increase in ventilation resistance due to the installation of the resistor 24 can be minimized. be able to.

[Modification] The guide plate 33 is not limited to the shape shown in FIGS. 1 and 2, but may be a flat plate integrally formed with the cooler case 32. For example, as shown in FIG. 6, the end surface on the inflow port 32a side may be inclined. Alternatively, the height of the guide plate 33 may be changed in the vertical direction (horizontal direction in FIG. 6) according to the position of the inlet 32a of the cooler case 32. Also, the guide plate 3
The plate thickness of 3 may have a meat-throwing shape (hollow) at the center as shown in FIG. 7 as long as it has a necessary thickness (2 mm in this embodiment).

In this embodiment, the system in which the rotation speed of the blower motor 23 is changed by switching the resistance is shown, but a system in which switching control is performed by an electronic circuit may be used. Therefore, in the case of this electronic circuit type, instead of the resistor 24,
As a resistance means, a power transistor can be installed between the guide plate 33 and the inner wall surface of the cooler case 32.

In this embodiment, the duct for introducing air into the passenger compartment is composed of the cooler case 32 and the heater case 42, but the cooler unit 30 shares the heater unit 40 or the blower unit 20 and the outer case together. Is also good.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram (plan sectional view) showing a ventilation path of a vehicle air conditioner.

FIG. 2 is a sectional view of a blower unit and a cooler unit.

FIG. 3 is a side sectional view of a heater unit.

FIG. 4 is a wind velocity distribution map of the cooling heat exchanger when the guide plate is not installed.

FIG. 5 is a wind velocity distribution diagram of the cooling heat exchanger when the guide plate is installed.

FIG. 6 is a sectional view of a cooler unit showing a modified example of a guide plate.

FIG. 7 is a cross-sectional view showing a modified example of the guide plate.

FIG. 8 is a sectional view (prior art) showing a positional relationship between a blower and a cooler unit.

FIG. 9 is a plan sectional view of a cooler unit showing a conventional technique.

FIG. 10 is a side sectional view of a cooler unit showing a conventional technique.

[Explanation of Codes] 10 Vehicle Air Conditioner 20 Blower Unit (Blower) 24 Resistor (Resistor Means) 31 Cooling Heat Exchanger (Cooling Means) 32 Cooler Case (Duct) 33 Guide Plate (Shield Plate) 42 Heater Case ( duct)

Claims (4)

[Claims] 1. A duct for introducing air into a passenger compartment, a cooling means arranged in the duct to cool passing air, and a duct inside the duct from a side of the cooling means upstream of the cooling means. In a vehicle air conditioner equipped with a blower for sending air to the cooling means, in the duct on the side opposite to the side where the blower is attached with respect to the cooling means, at a portion where the flow velocity of the air blown to the cooling means increases. An air conditioner for a vehicle, comprising a shielding plate facing the cooling means to block the flow of air. 2. The vehicle air conditioner according to claim 1, wherein the shielding plate is projected in a plate shape from a wall surface of the duct on a side opposite to a side where the blower is attached, in a blowing direction of the blower. A vehicle air conditioner characterized by the above. 3. The vehicle air conditioner according to claim 1, wherein the number of revolutions of the blower is in a space formed between the shield plate and an inner wall surface of the duct on the windward side of the shield plate. A vehicle air conditioner, wherein a resistance means for adjusting the air conditioner is installed. 4. The vehicle air conditioner according to claim 1, wherein the shielding plate is formed integrally with the duct.