JPH0726175Y2 - Casing structure of air conditioning unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a casing structure of a vehicle air conditioning unit,
More specifically, the present invention relates to a casing structure for easily and inexpensively forming a bypass auxiliary air passage as needed.

(Prior Art) Generally, in an air conditioning unit for a vehicle, an evaporator of a cooling unit is arranged in an air passage on a downstream side of a blower in a unit casing, and a heater core is arranged in an air passage on a downstream side of an evaporator. The air passage on the downstream side of the core branches into a plurality of passages and is connected to air outlets arranged at various places in the vehicle interior. Generally, these branch passages form a heat duct for blowing air to the lower body such as the occupant's feet, a pent duct for blowing air to the occupant's face, upper body such as the chest, and a defroster duct for defrosting the window. A control door for controlling the flow of air is provided at an appropriate position in the air passage in the unit casing. For example, the control provided on the air inlet side of the heater core together with the control of the cooling unit and the heater core. By controlling the turning position of the door, it is possible to send cold air, warm air, or a mixed air thereof to the branch passage.

However, even if the turning position of the control door on the heater core entrance side is controlled, it is difficult to make the temperature of the Oze sent to each branch passage different. When bi-level mode air conditioning of so-called head cold foot heat that sends cold air to the upper body such as the face is desired, the cool air in the upstream air passage of the heater core in the unit casing is directly sent to the occupant's upper body. It is necessary to provide a bypass auxiliary air passage for sending to the vent duct).

A technique for forming an auxiliary air passage for bypass in a proper position of a unit casing is disclosed in, for example, Japanese Utility Model Publication No. 55-70309 and Japanese Utility Model Publication No.
It is disclosed in Japanese Patent Laid-Open No. 3-3228. In the conventional air conditioning units disclosed in these publications, pipes or hoses for forming a bypass auxiliary air passage are used, and both ends of the pipes or hoses are provided in holes formed at appropriate positions in the unit casing. They are connected and fixed by welding or fasteners.

(Problems to be solved by the invention) When manufacturing an air conditioning unit for a vehicle, depending on the grade of the vehicle, the bypass auxiliary air passage may or may not be required. Or, if the hole for connecting the hose is formed in advance, it cannot be applied to the air conditioning unit that does not need the bypass auxiliary air passage. On the other hand, it is difficult to newly open a hole for connecting a pipe or a hose on the outer wall of the unit casing in which the necessary parts have been assembled. For this reason, conventionally, an air conditioning unit requiring a bypass auxiliary air passage and an air conditioning unit not requiring a bypass auxiliary air passage have been manufactured and stored separately, which has been a cause of cost increase.

Therefore, an object of the present invention is to provide a casing structure of an air conditioning unit in which a bypass auxiliary air passage can be easily and inexpensively formed as needed.

(Means for Solving the Problem) In order to achieve the above object, the casing structure of the air conditioning unit according to the present invention is configured as follows. That is, the unit casing that forms an air passage that branches and extends into a plurality of ducts through the blower, the evaporator, and the heater core, and the outer surface of the unit casing over the section from the vicinity of the heater core to the branch air passage to the required duct. An auxiliary casing having a substantially U-shaped cross section, which is formed so as to be attachable and cooperates with the unit casing to form an auxiliary air passage for bypass when attached to the unit casing. Is attached to the unit casing, a fragile portion for forming a hole for connecting the air inlet side end and the air outlet side end of the auxiliary casing is formed in a loop shape.

(Operation) In the casing structure of the air conditioning unit having the above configuration, when the bypass auxiliary air passage is required,
A hole for connecting the auxiliary casing can be easily opened in the unit casing by applying an appropriate external force to the wall portion surrounded by the loop-shaped weak portion. Then, by attaching the auxiliary casing to the outer surface of the unit casing and connecting the air inlet side end and the air outlet side end of the auxiliary casing to the corresponding holes, an air conditioning unit having a bypass auxiliary air passage can be obtained. it can. in this case,
Since the cool air can be sent directly from the upstream side of the heater core to the desired branch passage, it is possible to separately guide the warm air that has passed through the heater core and the cool air that has passed through the bypass auxiliary air passage to the appropriate places in the vehicle interior. it can. Since the bypass auxiliary air passage is formed between the inner surface of the auxiliary casing and the outer surface of the unit casing, the material cost can be reduced, and the structure can be simplified and made compact.

On the other hand, if the bypass auxiliary air passage is not needed, the auxiliary casing is not used, and the unit casing is used with the wall portion surrounded by the loop-shaped fragile portion remaining, thereby providing the bypass auxiliary air passage. It is possible to provide an air conditioning unit that does not have a risk of air leakage.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 7 show an embodiment of the present invention. Referring to FIG. 3, the air conditioning unit includes an air intake unit 10, a cooling unit 20 connected to the downstream side of the air intake unit 10, and a heater unit 30 connected to the downstream side of the cooling unit 20. The heater unit 30 can be connected with a heat duct 41 for blowing air to the lower body such as the occupant's feet, a vent duct 42 for blowing air to the occupant's face and upper body such as the chest, and a defroster duct 43 for wind defrosting. ing. These ducts 41-43
Is connected to an air outlet (not shown) arranged in a proper place in the vehicle compartment.

The casing 11 of the air intake unit 10 has an outside air intake port 12
And an inside air intake port 13, and a blower 14 in the air passage inside the casing 11 and a control door for adjusting the intake amount of air from the outside air intake port 12 and the inside air intake port 13.
15 and are provided. Casing 21 for cooling unit 20
An evaporator 22 is provided in the inner air passage.
A heater core 32 is provided in an air passage inside a casing 31 of the heater unit 30, and the inside of the casing 31 has a warm air passage passing through the heater core 32 and a heater core.
It is branched into a cold air passage that bypasses 32. By adjusting the turning position of the control door 33 provided on the inlet side of the heater core 32, it is possible to switch between the warm air passage and the cold air passage in the casing 31 and adjust the air flow rate passing through both passages. . Branch air passages connected to the above-mentioned ducts 41 to 43 are formed on the downstream side of the heater core 32 in the casing 31, and control doors 34 for adjusting the opening are provided at the entrances of the branch air passages. , 35,36 are provided.

The air conditioning unit includes an operation panel (not shown) provided in the passenger compartment, and the blower 14, the cooling unit 20, the heater unit 30, and the control doors 15, 33 according to the operation of the operation panel.
And a control unit (not shown) for controlling. Various known modes can be adopted as the operation and control modes of the air conditioning unit, but since they are unrelated to the gist of the present invention, detailed description thereof will be omitted.

As shown in FIGS. 1 to 6, according to the present invention, the air conditioning unit further includes a casing 31 of the heater unit 30 over a section from the upstream side of the heater core 32 to the branch air passage to the vent duct 42, for example. An auxiliary casing 50 having a substantially U-shaped cross section is formed so as to be attachable to the outer surface of the. In this embodiment, the auxiliary casing 50 can be fixed to the casing 31 with the screw 51, but the auxiliary casing 50 can be spot-welded or the like when necessary to make the casing 31.
You may stick to.

On the other hand, according to the present invention, in the casing 31 of the heater unit 30, as shown in phantom in FIG.
Are formed in a loop shape. As shown in FIG. 7, in this embodiment, by forming the groove 37a (38a) on the wall surface of the casing 31, the thin fragile portion 37 (38) is formed in a loop shape. When an appropriate external force is applied to the wall portion surrounded by the loop-shaped weak portions 37 and 38, the weak portions 37 and 38 are broken and holes 37b and 38b (see FIG. 3) are opened in the casing 31. Become.

Therefore, when it is necessary to form a bypass auxiliary air passage in the air conditioning unit, the casing is processed by the method described above.
By forming holes 37b and 38b in 31 and attaching the auxiliary casing 50 to the casing 31 and connecting the air inlet side end and the air outlet side end of the auxiliary casing 50 to the corresponding holes 37b and 38b, the auxiliary A bypass auxiliary air passage 52 can be formed between the inner surface of the casing 50 and the outer surface of the casing 31.

By forming the auxiliary air passage 52 for bypass, the heater core
Since the cool air on the upstream side of 32 can be directly guided to the branch passage to the vent duct 42, the warm air that has passed through the heater core 32 is sent from the heat duct 41 to the lower body such as the feet of the occupant in the vehicle compartment and bypassed. The cool air passing through the auxiliary air passage (52) can be blown from the vent duct (42) to the upper body such as the occupant's face in the passenger compartment.

Since the bypass auxiliary air passage 52 is formed between the inner surface of the auxiliary casing 50 and the outer surface of the casing 31 of the unit, the material cost can be reduced, and the structure can be simplified and made compact.

On the other hand, if the bypass auxiliary air passage 52 is not necessary, the auxiliary casing 50 is not used, and the casing 31 of the unit is used with the wall portion surrounded by the loop-shaped weak portions 37 and 38 remaining, thereby bypassing the bypass. It is possible to provide an air conditioning unit that does not have the auxiliary air passage 52 for use and has no fear of air leakage.

As shown in FIG. 3, a control door 53 for adjusting the air volume can be provided in the bypass auxiliary air passage 52 inside the auxiliary casing 50.

Although the embodiment shown in the drawings has been described above, the present invention is not limited to the embodiment described above. For example, the shape of the auxiliary casing, the formation position of the fragile portion, etc. form the bypass auxiliary air passage 52. It can be appropriately determined according to the position and purpose. It is also possible to attach a plurality of auxiliary casings to the casing of the unit at the same time.

(Effect of the Invention) As is apparent from the above description, according to the configuration of the present invention, if the auxiliary casing is not used and the wall portion surrounded by the loop-like weakened portion of the casing is used, An air conditioning unit that does not require a bypass auxiliary air passage can be provided. On the other hand, if a bypass auxiliary air passage is required,
Since the wall portion surrounded by the loop-shaped weak portion can be easily removed, a hole can be easily opened in the casing of the unit. Further, since the bypass auxiliary air passage can be formed easily and inexpensively by using the hole formed in the casing and the auxiliary casing, it is possible to easily manufacture the air conditioning unit that requires the bypass auxiliary air passage. As described above, the common unit casing can be used to easily and inexpensively separate the air conditioning unit having the bypass auxiliary air passage and the air conditioning unit not having the bypass auxiliary air passage. Since it is not necessary to separately manufacture and store the air conditioning unit having the above and the air conditioning unit that does not require the bypass auxiliary air passage, it is possible to achieve cost reduction.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an air conditioning unit showing an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the air conditioning unit shown in FIG. 1 in which a bypass auxiliary air passage is formed. FIG. 3 is a sectional view of the air conditioning unit shown in FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3 of the air conditioning unit shown in FIG. FIG. 5 is a sectional view of the air conditioning unit shown in FIG. 2 taken along the line VV in FIG. FIG. 6 is a plan view of an essential part of the air conditioning unit shown in FIG. FIG. 7 is an enlarged sectional view of a fragile portion formed in the unit casing. 10: Air intake unit 20: Cooling unit 30: Heater unit 11,21,31; Casing 14: Blower 22: Evaporator 32: Heater core 37,38: Weak section 41,42, 43: Duct 50: Auxiliary casing 52: Bypass Auxiliary air passage

Claims (1)

[Scope of utility model registration request] 1. A unit casing that forms an air passage branching and extending to a plurality of ducts through a blower, an evaporator, and a heater core, and a unit casing over a section from the vicinity of the heater core to a branch air passage to a required duct. And an auxiliary casing having a substantially U-shaped cross section that forms a bypass auxiliary air passage in cooperation with the unit casing when attached to the outer surface of the unit casing. An air conditioning unit characterized in that a weak portion for forming a hole connecting to the air inlet side end and the air outlet side end of the auxiliary casing is formed in a loop shape when the auxiliary casing is attached to the unit casing. Casing structure.