JP2001113941A - Air conditioning unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a sufficient air flow to an air filter even if the width of an air blow passage is not increased. SOLUTION: A cooling heat exchanger 13 is disposed in the air flow passage 11 allowing the air blown from a blower 5 to flow generally in vertical direction. Also, the air filter 31 is disposed on the upstream side of the cooling heat exchanger 13 horizontally. An inlet opening 37 allowing air to flow is provided at the upper end part of the air filter 31 so that air can be introduced from the front and the upper inlet opening 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning unit suitable for an automobile.

[0002]

2. Description of the Related Art Conventionally, an air conditioning unit integrating a heat exchanger for cooling, a heat exchanger for heating and a blower is arranged at the rear of an engine room at the center in the front width direction of a vehicle interior. The thing of Unexamined-Japanese-Patent No. 9-267620 is known. FIG. 5 shows a specific example.

That is, the air from the blower 101 is guided by a blower passage 103, descends from top to bottom, and makes a cooling heat exchanger 105 and a heating heat exchanger 10 when making a U-turn.
Go through 7. At the time of this passage, heat exchange is performed in the order of cooling, heating, mixing and harmony, the conditioned air,
By controlling the switching of each door 109, each indoor air outlet 11 can be controlled.
1 is blown out toward the vehicle interior.

[0004]

There is a growing need to add a filtration type air filter to an air conditioning unit for the purpose of purifying the air in a vehicle cabin from a health and cleanliness perspective. Further, in the cooling heat exchanger 105 for cooling the taken-in outside air, if dust or the like adheres, the efficiency of heat exchange deteriorates. Therefore, an air filter 113 is provided on the upstream side.

The air filter 113 can be installed without increasing the width of the air passage 103 by disposing the air filter 113 in the air passage 103 flowing from the top to the bottom. Since it is narrowed to d1, an adverse effect such as a restriction on the flow of air passing through the air filter 113 is produced.

As a means for solving this problem, for example, it is conceivable to move the air filter 113 and the cooling heat exchanger 105 to the right side of the drawing to secure the passage width d. Without expanding, the opening / closing door 109 and the heating heat exchanger 107 located on the downstream side
It is technically difficult to lay out the data at an efficient position.

As another means, if the width of the passage is enlarged as indicated by the imaginary line, the entire unit case becomes larger by the amount of the enlargement, which causes a new problem which is contrary to downsizing.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioning unit for a vehicle in which a sufficient amount of air passing through an air filter can be obtained without increasing the width of an air passage.

[0009]

In order to achieve the above object, according to the present invention, there is provided a vehicle for a vehicle in which a cooling heat exchanger is disposed substantially vertically in a ventilation passage through which air blown from a blower flows. In the air conditioning unit, in the air passage that flows downward from above, on the upstream side of the cooling heat exchanger,
An air filter is arranged in parallel, and an intake opening through which air flows is provided at the upper end of the air filter.

[0010] Thus, the air from the blower is guided to the blower passage, passes through the air filter, and passes through the cooling heat exchanger after dust and the like have been removed. During this passage, heat exchange takes place and is cooled.

In this operation, the air flowing from above to below flows not only from the front surface of the air filter but also directly from the inlet opening at the upper end.
Sufficient air flow through the air filter can be obtained without increasing the width of the passage.

[0012]

According to the air conditioning unit for a vehicle of the present invention, in addition to the flow for taking in air from the front of the air filter, the flow for taking in air directly from the upper end can be ensured. Can be obtained without increasing the air flow rate. As a result, it is possible to install the filter in a ventilation passage having a narrow passage width without reducing the filter efficiency.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a unit case of the air conditioning unit 3. Inside the unit case 1, a blower 5 which is a main component, a blow passage 11 for guiding air from the blower 5 toward connection ports 7 and 9 which are a vent port and a differential port, And a heat exchanger for heating 13 and a heat exchanger 15 for heating arranged at the same position.

The blower 5 is disposed in a housing 21 having an inlet 17 and a blower port 19, and is supplied with rotational power by a drive motor 23.

The blower passage 11 is connected to and communicates with a blower opening 19 of the housing 21, and a descending passage 23 for guiding air from the blower outlet 19 downwardly, and a U-turn passage for making air from the descending passage 23 U-turn. 25 and an ascending passage 27 for guiding the air from the U-turn passage 25 upward.

The cooling heat exchanger 13 is supported by the upper and lower support brackets 29 in an inclined posture.
The air is arranged substantially in parallel with the descending passage 11 through which the air flows from top to bottom.

An air filter 31 is mounted in the descending passage 23 on the upstream side of the cooling heat exchanger 13.

As shown in FIG. 2, the air filter 31 is provided with a corrugated filter section 35 in a peripheral wall 33 surrounded on the left, right, and bottom. The upper end of the peripheral wall 33 is an intake opening 37 for directly taking in the air flowing from the top to the bottom without bending, and the front surface of the filter unit (arrow B).
The air is taken in from the intake opening 37.

In this case, as shown in FIG. 3, the structure of the filter section 35 of the air filter 31 is changed from the upper intake opening 37 on the upstream side to the lower side on the downstream side. By making the diameter gradually increase, the amount of air taken in from above can be greatly increased.

Alternatively, as a modified example, as shown in FIG. 4, when arranging a corrugated filter section 35 orthogonal to the flow, the upper intake opening 37 on the upstream side may be moved downward from the upper intake opening 37 on the downstream side. By making the diameter of the corrugated plate of the filter section 35 gradually increase toward the same, the amount of air taken from above can be greatly increased.

The heating heat exchanger 15 is provided with a first passage 41 through which the air from the cooling heat exchanger 13 flows toward the mix door 39 without passing through the heating heat exchanger 15 and the heating heat exchanger 15. , And is supported by the front and rear support brackets 45. As a result, as shown in FIG. 1, a substantially horizontal T-shaped layout structure is formed with the cooling heat exchanger 13, so that the unit case 1 has a reduced vertical dimension.

The heating heat exchanger 15 is designed to flow heated water heated by an engine (not shown). When air passes through the heat exchanger body, heat is exchanged and heated. It has become so.

When the mixing door 39 is at the position shown by the solid line in FIG.
The first passage 41 is closed, a full hot state is obtained, and switching control is performed so that the air from the cooling heat exchanger 13 flows toward the heat exchanger 15 for full heating. Hereinafter, the first passage 41 in which the mix door 39 rotates toward the chain line position
The amount of passage through the heat exchanger for heating 15 is set in accordance with the degree of opening, so that mixed and conditioned air is ensured.

On the other hand, the connection ports 7 and 9 are connected to the unit case 1
Engine room side case wall 47 and its case wall 4
An opening / closing door 51 that is arranged intensively on an upper wall surface 49 that continues from 7 and that controls switching of the connection ports 7 and 9 alternately is provided at the center of the connection ports 7 and 9.

A ventilator duct 53 having indoor air outlets 53a (both sides are not shown) at the center and both left and right sides are connected to the connection port 7 serving as a vent port.

The connection port 9 serving as a defroster port is connected to a defroster duct 57 for blowing air toward the windshield 55.

In FIG. 1, reference numeral 59 denotes a foot opening for sending air to the feet, which can be opened and closed by an opening / closing door 61.

The air conditioning unit 3 configured as described above
According to the above, the air blown from the blower 5 is subjected to heat exchange when passing through the cooling heat exchanger 13 and the heating heat exchanger 15 after dust and the like are removed when passing through the air filter 31. It is mixed and adjusted to a predetermined temperature. The mixed and conditioned air is controlled by opening and closing the doors 51, 61,
It is blown out toward the passenger compartment.

In a series of these operations, when air from the blower 5 flows down from the top in the descending passage 23, the air is taken directly from the upper intake opening 37 and passes through the filter section 35 (arrow opening). Filter section 35 from the front side
Dust and the like are removed by the flow (arrow a) passing through the air.

In this case, the passage width d is reduced to d1 by the air filter 31, but in addition to the intake from the front,
With the flow that directly takes in the air flowing from top to bottom,
The original passage width d can be secured, and a sufficient air flow rate can be obtained for the filter unit 35.

The air filter 31 can be applied to a ventilation passage in which air blown out from the ventilation opening 19 flows from the engine room to the vehicle compartment.

[Brief description of the drawings]

FIG. 1 is a schematic sectional side view showing an air conditioning unit for a vehicle according to the present invention.

FIG. 2 is a schematic perspective view of an air filter.

FIG. 3 is a schematic perspective view similar to FIG. 2, showing another embodiment of the air filter.

FIG. 4 is a schematic perspective view similar to FIG. 2, showing another embodiment of the air filter.

FIG. 5 is a schematic sectional view similar to FIG. 1 showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 unit case 5 blower 11 blower passage 13 cooling heat exchanger 31 air filter 35 filter unit 37 intake opening

Claims (1)

[Claims] A cooling heat exchanger (1) is arranged substantially vertically in an air passage (11) through which air blown from a blower (5) flows.
In the air conditioning unit for a vehicle in which 3) is arranged, an air filter (31) is arranged in parallel in the air passage that flows from above to below, upstream of the cooling heat exchanger (13). An air conditioning unit for a vehicle, wherein an intake opening (37) through which air flows is provided at an upper end of an air filter (31).