JP3617071B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, a vehicle air conditioner is configured so that a cooler unit that houses a refrigerant evaporator is connected downstream of a blower unit that houses a blower, and air sent from the blower passes through the refrigerant evaporator. Yes. Here, when the air flow changes abruptly 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 provided on the side of the unit 100, the amount of air passing through the refrigerant evaporator 200 is biased. That is, in the case of FIG. 8, the air that has flowed in from the inlet 110 of the cooler unit 100 tries to go straight as it is, so that the amount of air that passes through the refrigerant evaporator 200 is small near the inlet 110 and is smaller than the inlet 110. At a distant place, the amount of air passing through the refrigerant evaporator 200 increases.
[0003]
Therefore, in Japanese Patent Laid-Open No. 5-85148, as shown in FIGS. 9 and 10, the refrigerant evaporator 200 is installed by installing a guide plate 300 having a substantially L shape upstream (upwind) of the refrigerant evaporator 200. A technique for making the distribution of the amount of air passing through the air uniform is disclosed.
[0004]
[Problems to be solved by the invention]
However, in the prior art disclosed in the above publication, since the guide plate 300 is attached to the duct wall surface 400 (see FIG. 9) facing the refrigerant evaporator 200, the resistor 500 (or transistor) that requires cooling by air blowing. This causes the problem that the airflow resistance increases due to the mounting position of the windshield being on the windward side of the guide plate 300.
The present invention has been made based on the above circumstances, and an object of the present invention is to make uniform the wind speed distribution passing through the cooling means without causing an increase in ventilation resistance.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises the following technical means for each claim.
In claim 1, a duct that guides air into the passenger compartment, a cooling means that is arranged in the duct and cools the air passing therethrough, and in the duct from the side upstream of the cooling means with respect to the cooling means. The blower has a blower case, a fan, and a blower motor. The blower case has a discharge port for discharging blown air, and the duct has a discharge port for the discharge port. In the vehicle air conditioner in which the inflow port to be connected is formed ,
A shielding plate that blocks the flow of air facing the cooling means is installed at a portion where the flow velocity of the air blown to the cooling means in the duct is increased, and the shielding plate is disposed on the cooling means with respect to the cooling means. Projected in a plate shape from the wall surface of the duct on the side opposite to the mounting side of the blower toward the blowing direction of the blower, and formed between the shielding plate and the inner wall surface of the duct on the windward side of the shielding plate Resisting means for adjusting the rotational speed of the blower is installed in the space to be provided, and the resistance means is arranged at a position facing the discharge port of the blower case.
[0008]
In Claim 2 , in the vehicle air conditioner described in Claim 1 ,
The shielding plate is formed integrally with the duct.
[0009]
[Operation and effect of the invention]
The air blown from the blower is sent into the duct from the side with respect to the cooling means upstream of the cooling means, and then is bent substantially at right angles within the duct and sent to the cooling means.
In the duct, a shielding plate is provided at a portion where the flow velocity of the air blown to the cooling means increases to face the cooling means and block the air flow. Accordingly, the flow speed of the air is to flow more air to small sites, it is possible to uniform the air velocity distribution of the air passing through the cooling means.
[0010]
Moreover, the shielding board is installed in the site | part where the flow velocity of air is large facing the cooling means . Specifically, it protrudes in the shape of a plate from the wall surface of the duct on the side opposite to the mounting side of the blower toward the blowing direction of the blower. And since the resistance means for adjusting the rotation speed of the blower is installed at a position between the windward side of the shielding plate and the inner wall surface of the duct and facing the discharge port of the blower case The increase in ventilation resistance due to the installation of the resistance means can be minimized, and the resistance means can be cooled by receiving blown air from the blower.
[0011]
【Example】
Next, an embodiment of a vehicle air conditioner according to the present invention will be described with reference to FIGS.
FIG. 1 is an overall schematic diagram of a vehicle air conditioner.
The vehicle air conditioner 10 of this embodiment includes a blower unit 20, a cooler unit 30, and a heater unit 40.
[0012]
The blower unit 20 constitutes blower means (blower of the present invention) for sending air into the passenger compartment. The blower unit 20 includes a blower case 21, a centrifugal fan 22, and a blower motor 23 (see FIG. 2). The number of rotations of the blower motor 23 is varied by switching the resistor 24 (resisting means of the present invention) interposed between the two.
[0013]
As shown in FIG. 2, the blower case 21 has an inside air introduction port 21a for introducing vehicle interior air (inside air), an outside air introduction port 21b for introducing vehicle interior air (outside air), and a discharge port 21c for discharging blown air. And an inside / outside air switching damper 25 that selectively opens and closes the inside air introduction port 21a and the outside air introduction port 21b. The inside / outside air switching damper 25 is driven by driving means (not shown) such as a servo motor or a step motor through a link mechanism (not shown). The resistor 24 is installed in the cooler unit 30 because it requires cooling by blowing air (described later).
[0014]
The cooler unit 30 includes a cooling heat exchanger 31 (cooling means of the present invention) that cools the air sent from the blower unit 20, and a cooler case 32 that accommodates the cooling heat exchanger 31. The cooling heat exchanger 31 is a refrigerant evaporator of a refrigeration cycle, and cools the air passing through heat exchange with a low-temperature and low-pressure refrigerant supplied by operation of a refrigerant compressor (not shown).
[0015]
The cooler case 32 includes an inlet 32a that is airtightly connected to the discharge port 21c of the blower case 21 via a seal member 50 such as packing, and an outlet 32b from which the air cooled by the cooling heat exchanger 31 flows out. Is formed. In the cooler case 32, a guide plate 33 (described later) is provided upstream (upwind) of the cooling heat exchanger 31.
[0016]
The heater unit 40 includes a heating heat exchanger 41 that heats the air sent from the cooler unit 30 and a heater case 42 that houses the heating heat exchanger 41.
The heating heat exchanger 41 heats the air that passes through the engine coolant as a heat source, and a bypass 43 (see FIG. 3) that bypasses the heating heat exchanger 41 in the heater case 42 is formed. It is arranged in. The ratio between 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 attached 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 through a link mechanism (not shown).
[0017]
The heater case 42, together with the cooler case 32, forms a duct that guides the air sent from the blower unit 20 to the vehicle interior. The heater case 42 is hermetically connected to the outlet 32b of the cooler case 32 through a sealing material 51 such as packing. The air inlet 42a and the air outlets 42b, 42c and 42d through which the conditioned air whose temperature is adjusted by the air mix damper 44 flow out are formed.
[0018]
Further, in the heater case 42, outlet switching dampers 42e, 42f, and 42g (see FIGS. 1 and 3) that selectively open and close the outlets 42b, 42c, and 42d are provided. The outlet switching dampers 42e, 42f, and 42g are driven by driving means (not shown) such as a servo motor or a step motor through a link mechanism (not shown).
[0019]
In addition, the outflow port 42b is opened to the upper surface of the cooler case 32, and is connected to the defroster blowout port 52 which blows air toward the window glass of a vehicle through the branch duct 45 (refer FIG. 3). The outlet 42c opens to the side of the cooler case 32 (in the vehicle interior direction) and communicates with a face outlet 53 that blows air toward the upper body of the occupant through the branch duct 46 (see FIG. 1). . The outflow port 42d is open to the lower surface of the cooler case 32 and communicates with a foot outlet 54 that blows air toward the feet of the occupant via the branch duct 47 (see FIG. 3).
[0020]
In the vehicle air conditioner 10 of the present embodiment, the cooler unit 30 and the heater unit 40 are arranged in the vehicle width direction (left and right direction in FIG. 1), whereas the blower unit 20 is on the vehicle front side of the cooler unit 30. (Upper side in FIG. 1). Therefore, the inlet 32a of the cooler case 32 is opened to the lower side of the vehicle front side wall surface of the cooler case 32 (see FIGS. 1 and 2). For this reason, the air sent from the blower unit 20 is bent at a substantially right angle in the cooler case 32 and blown to the cooling heat exchanger 31.
[0021]
The above-described guide plate 33 (shielding plate of the present invention) is provided to make the air velocity distribution of the air passing through the cooling heat exchanger 31 uniform, and the cooling heat exchanger 31 in the cooler case 32. It is installed in a part where the flow velocity of the airflow flowing toward the air is large so as to block the airflow. Specifically, over the entire vertical direction of the cooler case 32 (the vertical direction in FIG. 2), the side opposite to the wall surface where the inlet 32a of the cooler case 32 is formed (that is, the side opposite to the mounting side of the blower unit 20). Are provided upright in a plate shape in the blowing direction of the blower unit 20 (in the direction of the inflow port 32a). The guide plate 33 is made of a resin integrally formed with the cooler case 32 and has a plate thickness of 2 mm in this embodiment.
[0022]
As shown in FIG. 1, the resistor 24 of the blower unit 20 is installed on the wall surface of the cooler case 32 provided with the guide plate 33 on the windward side of the guide plate 33. Therefore, since the resistor 24 is disposed at a position facing the discharge port 21c of the blower case 21, the resistor 24 can receive and cool air from the blower unit 20.
[0023]
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 is bent at a substantially right angle in the cooler case 32 and blown to the cooling heat exchanger 31. For this reason, when the guide plate 33 is not installed, the wind speed distribution of the air passing through the cooling heat exchanger 31 becomes non-uniform, and the heat exchanger for cooling is located farther from the vicinity of the inlet 32a of the cooler case 32. The wind speed of the air passing through the vessel 31 increases.
[0024]
On the other hand, in the present embodiment, the guide plate 33 is installed at a portion where the wind speed increases on the wind of the cooling heat exchanger 31, so that air with a high wind speed is directly blown to the cooling heat exchanger 31. However, since the air once collides with the guide plate 33 and flows to the part where the wind speed is originally low, the wind speed distribution of the air passing through the cooling heat exchanger 31 can be made uniform.
[0025]
Here, the results of measuring the wind speed 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. In addition, the measuring method measures the exit wind speed of the heat exchanger 31 for cooling with the multipoint anemometer.
[0026]
According to this measurement, it was confirmed that in the state where the guide plate 33 is not installed, the wind speed is increased at the lower right portion of the cooling heat exchanger 31 as shown in FIG. On the other hand, in the state where the guide plate 33 is installed, it was confirmed that the wind speed distribution is uniform as a whole as shown in FIG. However, each code | symbol marked in a figure shows the following wind speed areas (unit m / s).
A = 0.0-0.6, B = 0.6-1.2, C = 1.2-1.8
D = 1.8-2.4, E = 2.4-3.0, F = 3.0-3.6
G = 3.6 to 4.2, H = 4.2 to 4.8, I = 4.8 to 5.4
J = 5.4 or more [0027]
As confirmed from this measurement result, the wind speed distribution of the air passing through the cooling heat exchanger 31 can be made uniform by installing the guide plate 33 at a portion where the wind speed is high. As a result, variations in the temperature of the blown air into the vehicle compartment and the amount of blown air are prevented, and the temperature controllability in the vehicle compartment can be improved.
[0028]
Further, in this embodiment, the guide plate 33 is provided upright on the side opposite to the inlet 32a of the cooler case 32 toward the blower unit 20 in the blowing direction (inlet direction). It is possible to secure a space for installing the resistor 24 between the windward side 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 is minimized. be able to.
[0029]
[Modification]
The guide plate 33 is not limited to the shape shown in FIGS. 1 and 2, and may be a flat plate formed integrally with the cooler case 32. For example, as shown in FIG. 6, the shape where the end surface by the side of the inflow port 32a inclined may be sufficient. Or according to the position of the inflow port 32a of the cooler case 32, you may change the height of the guide plate 33 in the up-down direction (left-right direction of FIG. 6).
Moreover, as long as the plate | board thickness of the guide plate 33 has required thickness (2 mm in a present Example), as shown in FIG. 7, the center may be a meat stealing shape (cavity).
[0030]
In the present embodiment, the method of changing the rotation speed of the blower motor 23 by switching the resistance is shown, but a method of switching control by an electronic circuit may be used. Therefore, in the case of this electronic circuit type, instead of the resistor 24, a power transistor can be installed as a resistance means between the guide plate 33 and the inner wall surface of the cooler case 32.
[0031]
In this embodiment, the duct for guiding air into the vehicle compartment is composed of the cooler case 32 and the heater case 42. However, the cooler unit 30 may share the heater unit 40 or the blower unit 20 with the outer case.
[Brief description of the drawings]
FIG. 1 is an overall schematic diagram (plan sectional view) showing an air blowing path of a vehicle air conditioner.
FIG. 2 is a cross-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 speed distribution diagram of the cooling heat exchanger when no guide plate is installed.
FIG. 5 is a wind speed distribution diagram of a cooling heat exchanger when a guide plate is installed.
FIG. 6 is a cross-sectional view of a cooler unit showing a modification of the guide plate.
FIG. 7 is a cross-sectional view showing a modified example of the guide plate.
FIG. 8 is a cross-sectional view (prior art) showing the positional relationship between the blower and the cooler unit.
FIG. 9 is a plan sectional view of a cooler unit showing the prior art.
FIG. 10 is a side sectional view of a cooler unit showing a conventional technique.
[Explanation of symbols]
10 Vehicle Air Conditioner 20 Blower Unit (Blower)
24 resistors (resistance means)
31 Heat exchanger for cooling (cooling means)
32 Cooler case (duct)
33 Guide plate (shield plate)
42 Heater case (duct)

Claims (2)

A duct for guiding air into the passenger compartment,
A cooling means arranged in the duct for cooling the passing air;
A blower that sends air into the duct from the side of the cooling means upstream from the cooling means ;
The blower has a blower case, a fan, and a blower motor,
The blower case is formed with a discharge port for discharging blown air,
In the vehicle air conditioner in which the inlet connected to the discharge port is formed in the duct ,
A shielding plate that blocks the flow of air facing the cooling means is installed at a portion where the flow velocity of the air blown to the cooling means in the duct is increased, and the shielding plate is disposed on the cooling means with respect to the cooling means. From the wall surface of the duct on the side opposite to the mounting side of the blower, it is provided in a plate shape toward the blowing direction of the blower,
On the windward side of the shielding plate, in a space formed between the shielding plate and the inner wall surface of the duct, resistance means for adjusting the rotational speed of the blower is installed,
The vehicle air conditioner characterized in that the resistance means is disposed at a position facing the discharge port of the blower case . In the vehicle air conditioner according to claim 1,
The vehicle air conditioner, wherein the shielding plate is formed integrally with the duct.

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