JP2002274152A - Case extending member, air conditioning case using this case extending member, and method of assembling this air conditioning case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost of an air conditioning unit, by making a common case member usable even in a different kind of automobile between a light automobile and an ordinary automobile while obtaining an air conditioning capacity in accordance with the kind of automobile. SOLUTION: Relating to an air conditioning case 1 comprising a plurality of case members 41, 42 divided into two parts so as to be capable of incorporating an air conditioning part, by interposing a case extending member 43 between divided surfaces of the divided each case member 41, 42, a space between the divided surfaces of the case members 41, 42 of the air conditioning case 1 is changed, so as to adjust an air conditioning capacity of the incorporated air conditioning part, so that a common case member can be used even between a light automobile and an ordinary automobile requiring the different air conditioning capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner case, and more particularly to an improvement of an air conditioner case of an air conditioner unit for an automobile.

[0002]

2. Description of the Related Art In a four-wheeled vehicle, the maximum width of the vehicle in the direction intersecting with the traveling direction of the vehicle is determined by the type of vehicle such as a so-called liter car such as an ordinary car or a mini car. Since the volume of the space also varies depending on the type of vehicle, the air conditioning capacity required for the air conditioning unit mounted on the vehicle also differs for each type of vehicle.

On the other hand, the air conditioning unit is disclosed in
As disclosed in Japanese Patent No. 91743, an integrated air-conditioning unit in which a blower, an evaporator, a heater core, and other air-conditioning devices are built in one air-conditioning case has been developed.
In such an integrated air-conditioning unit, the air-conditioning case is vertically divided into a pair of left and right case members in order to make the above-mentioned air-conditioning parts detachable and facilitate maintenance. . In the air-conditioning case having such a configuration, the dimension of the side of the blower along the axial direction of the impeller and the area of the side surface facing the ventilation direction of the heat exchanger are the dimensions in the direction perpendicular to the dividing surface of each case member. Can be adjusted by changing.

[0004] For this reason, conventionally, the external dimensions of the case member are designed in accordance with the vehicle type so that the air conditioning capacity required for each vehicle type can be obtained in the mounting space for the air conditioning unit of each vehicle type. A case member having a relatively small outer size is used for a mini vehicle, and a case member having a relatively large outer size is used for a normal vehicle.

[0005]

On the other hand, in recent years, in order to reduce the cost of the air conditioning unit of the automobile, the components of all the air conditioning units have been standardized.
As described above, even for the air-conditioning case in which the external dimensions must be different for each vehicle type, it has been requested that the components be shared for each vehicle type.

[0006] In this case, if the case members are shared between different vehicle types while the vertically divided case members shown in the above-mentioned publication are simply joined together, the air-conditioning case for a light vehicle can be replaced with a normal vehicle. It may be used for business purposes. However, in this case, there is a disadvantage that the air-conditioning capacity of the air-conditioning unit for a normal vehicle is relatively reduced.

Therefore, in the present invention, a case extension member which enables a common case member to be used in different models of a mini car and a normal car while obtaining an air-conditioning capacity according to the car model, An object of the present invention is to provide an air-conditioning case used and an assembling method of the air-conditioning case.

[0008]

According to the present invention, there is provided a case extension member for an air-conditioning case comprising a plurality of case members divided into two or more so that an air-conditioning component can be built therein. By interposing one or two or more spaces between the divided surfaces of the case members, the distance between the divided surface of one case member and the divided surface of the other case member of the air conditioning case can be adjusted. Item 1).

The case extending member has a dividing surface of the one case member or an abutting surface which abuts against another case extending member.
A dividing surface of the other case member or an abutting surface that abuts against another case extending member, and these abutting surfaces are provided with a dividing surface of the abutting case member or an abutting surface of another case extending member. An engaging means for engaging with the second member is provided (claim 2). And, as an engagement means of the case extension member, a concave portion is provided on the one abutting surface so that a convex portion formed on a division surface of the one case member can be engaged, and the other abutting surface is provided on the other abutting surface. It is also possible to provide a convex portion that can be engaged with a concave portion formed on the division surface of the other case member.

[0010] The case extension member extends in a direction different from the abutting direction of the case members by being partitioned by the partition portion, or an air conditioning case in which an air passage branched into a plurality of flow paths is defined inside. When interposed between the case members constituting the air-conditioning case, the air conditioner has a partition portion that abuts against the dividing surface of the partition portion, and a strut portion is disposed to maintain the shape of the partition portion. (Claim 4).

Further, the case extension member has an installation portion for installing the built-in air conditioner therein, and
An air-conditioning case having a case member divided in a direction that divides the installation portion into two parts, has an installation portion that abuts against the split surface of the installation portion when interposed between the case members constituting the air-conditioning case. In addition, a support portion is provided to maintain the shape of the installation portion (claim 5).

Further, in the case extending member, a shaft seat portion for installing a door for opening and closing the air flow path and branching is defined therein, and the shaft seat portion is bisected. An air-conditioning case having a case member divided in a direction, a shaft seat portion that abuts against a dividing surface of the shaft seat portion when interposed between case members constituting the air-conditioning case, In order to maintain the shape of the part, a pillar part is provided (claim 6).

On the other hand, when the present invention is viewed as an air-conditioning case using a case extension member, the air-conditioning case includes a plurality of case members divided into two or more so that air-conditioning parts can be built therein. When joining the member and the case member, one or more of the case extending members according to any one of claims 1 to 6 can be interposed between the case members, and the case extension can be performed. The member has a dividing surface of one of the case members or an abutting surface that abuts against another case extending member, and a dividing surface of the other case member of the divided case member or another case extending member. Abutting surface for abutting against the member, wherein the abutting surface is provided with engaging means for engaging with the dividing surface of the case member or another case extending member. It becomes as (claim 7).

The method for assembling an air-conditioning case is a method for assembling an air-conditioning case having a plurality of case members divided into two or more so that air-conditioning components can be built therein. A space is provided between the case member and the case, and one or more case extension members according to any one of claims 1 to 6 are interposed in the space between the case members. When the extension member is engaged with the engagement means and two or more case extension members are interposed, the case extension members are also engaged with each other by the engagement means to assemble the air conditioning case. Claim 8).

The air conditioning components include, for example, blowers,
Evaporators, heater cores, air-mix doors, and blow-out mode doors are applicable. The air-conditioning case is also a unit case for an integrated air-conditioning unit incorporating all of the air-conditioning components, a blower case mainly including a blower, a cooling case mainly including an evaporator, and a heater case mainly including a heater unit. And the like.

According to the above description, in an air conditioning unit for a light vehicle, case members are directly joined to each other without a case extension member interposed therebetween, and in a normal automobile, one case extension member is interposed between case members and joined. Accordingly, the width in the direction in which the case member of the air conditioning case is joined to the case member is changed, and accordingly, the width of the air conditioning component built in the air conditioning case in the direction in which the case member is joined to the case member is also changed. On the other hand, a common case member can be used for the air conditioner unit of the mini vehicle and the air conditioner unit of the ordinary vehicle.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an example of an embodiment of an air conditioning case 1 according to the present invention. The air-conditioning case 1 is used for an all-in-one type integrated air-conditioning unit, and has a structure in which substantially all air-conditioning components (not shown) necessary for air-conditioning can be built. That is,
This air-conditioning case 1 is, as shown in FIG.
Blower unit 3 containing a blower, cooling unit 9 containing an evaporator, heating unit 16 containing a heater core, outlet 2
1, 22 and 23 and passages 24, 25 and 26 for guiding air to the outlets 21, 22, and 23.

The air-conditioning case 1 has a synthetic resin case member 41 shown in FIG. 1, a synthetic resin case member 42 shown in FIG. 2, and a synthetic resin case member shown in FIG. It is formed from a case extension member 43 made of resin.

Among these, the case members 41 and 42 have an annular outer wall 41 formed along the axial direction of the blower and along the side of the evaporator or heater core in the ventilation direction.
A, 42A and the outer walls 41B, 42B are formed so as to extend along the radial direction of the blower and at right angles to the side surfaces in the ventilation direction of the evaporator or the heater core, and to close one opening of the outer wall 41A or 42A. ing.

The case members 41 and 42 are provided with partitioning portions extending in a substantially arc shape along a substantially peripheral edge of the blower in order to define a boundary between the blowing section 3 and the cooling section 9, the heating section 16 or the passage 22. 5 and the partition 5
The air outlet opening forming part 6 which forms an air outlet which communicates the cooling part 9 and the air blowing part 3 is formed by having a gap which does not reach the inner peripheral surfaces of the outer walls 41A and 42A. A circular hole 4 is formed in a portion of the outer walls 41B and 42B on the inner peripheral side of the partition portion 5 for attaching and detaching a blower or for taking in air.

The case members 41 and 42 are provided in the cooling section 8.
The installation section 10 which holds the end of the evaporator on the blower side in order to securely install the evaporator inside
Is formed in the partition part 5, and the installation part 11 for holding the end of the evaporator on the side opposite to the blower is connected to the outer wall 41.
A and 42A are formed at portions facing the installation portion 10. The case members 41 and 42 define a boundary between the cooling unit 9 and the heating unit 16, and have a partitioning portion 17 formed therein to prevent the air passing through the evaporator from being short-circuited to the heater core. The partition 17 has a blower-side end that does not reach the partition 5, a passage is formed between the partition 5 and the partition 5, and the rotation axis of the air mix door has a rotation range between the ends of the passage. Is formed to be rotatable. Also, the outer wall 41A,
An installation portion 19 for holding the end of the heater core is provided on the inner surface of 42A.

Further, the case members 41 and 42 are provided with a partition portion 27 on the side opposite to the evaporator of the heater core, thereby forming a passage forming portion 28 for forming a passage 23 for guiding air to the foot outlet 21. In addition, a foot outlet 21 is formed on a side surface of the outer wall 41B of the passage forming portion 28. And the case members 41 and 42 are 3
A vent outlet and a differential outlet forming part 29 comprising two parallel plate parts 29A, 29B, 29C and a plate part 29D connected to the ends of the plate parts 29A, 29B, 29C are formed. Also, passages 24, 25, 26
The shaft seat portion 31 is provided on the outer wall 4 so as to rotatably seat the rotating shaft of the blow-out door for appropriately selecting the air to be blown to the outside door.
In the vicinity of the partition portion 27 of 1A, 42A, the shaft sheet portion 32 is provided with the plate portion 2 of the vent outlet / differential outlet forming portion 29.
9B.

On the other hand, the case extending member 43 is
As shown in FIG. 5, the partition 5, the air outlet forming part 6, the partitions 17, 27, the passage forming part 28, the installation parts 10, 11, 1
9 and the shaft seat portions 18, 31, 32 are formed in common with the case members 41, 42, while the outer wall 4 is joined to both the case members 41, 42.
The outer frame is formed only by the arc-shaped outer wall 43A having the abutting surface that abuts the cut surfaces 1A and 42A. Then, the vent outlet and the differential outlet forming part 29 are connected to the case member 4.
Three parallel plate portions having abutting surfaces at both ends so that the abutting surfaces can be formed by abutting against the cut surfaces of the vent outlets 1 and 42 and the differential outlet forming portion 29 to form the differential outlet 22 and the vent outlet 23. 29A, 29B and 29C are formed.

The case extending member 43 is connected to the case
As shown in FIG. 2, a plurality of columns 35 are used to maintain the shape. That is, the ventilation port forming section 6
In order to maintain the space between the outer wall 43A and the partition portion 5,
A support 35A is provided between the outer wall 43A and the partition 5. Further, in order to secure an appropriate rotation range when the air mix door is mounted, an arc-shaped support portion 35B is provided between the partition portion 5 and the partition portion 17, and the partition portion 17 and the shaft seat portion 18 are provided. Between the linear support portion 35C
And a support portion 35D connecting the partition portion 5, the shaft seat portion 18, and the partition portion 27 is provided.
A linear support 35E is provided between the shaft seat 18 and the partition 27. Further, the partition 2 of the passage 24
In order to maintain the space between the outer wall 43A and the outer wall 43A, a rectangular support portion 35F having a hollow inside is formed on the outer wall 43 of the passage forming portion 28.
A support 35G is provided between the partition 27 and the outer wall 43A to maintain a space between the partition 27 of the passages 25 and 26 and the outer wall 43A. Further, the partition portion 17 of the heater core installation portion 19 and the outer wall 43
In order to maintain the distance from the partition A, the partition 17 and the outer wall 43
A triangular pillar portions 35H are provided at the corners on the bottom side of A,
35I are provided. By using these support portions 35, the shape of the partition portion 5 and the like is maintained, and when the resin material is injected into the mold to form the case extension member 43, the support portions 35 serve as a supply passage and serve as a case. Extension member 43
The resin material spreads to the details of the case, and the molding of the case extension member 43 can be performed reliably and easily.

These pillars 35 are formed to have a small thickness on the side along the ventilation direction. In this case, it is desirable that the strut portion 35 has a streamline shape, such as a wing of an airplane, for example, in which the vicinity of both ends is narrow and the center is relatively thick compared to the both ends. By adopting such a configuration, the support portion 35 can function as an air guide without causing ventilation resistance.

However, according to the configuration of the case members 41 and 42 and the case extending member 43 described above, the air-conditioning case 1
The case members 41 and 42 are required for both a light vehicle that suffices with a relatively low air-conditioning capacity and an ordinary car called a litter car or the like that requires a relatively high air-conditioning capacity. The number of the case extension members 43 interposed between the case members 41 and 42 is set in a predetermined numerical range (for example, 0
This can be dealt with by adjusting the above (2 or less).

That is, the width of the case members 41 and 42 on the side along the joining direction is set to a size suitable for incorporating the air-conditioning parts for the mini-vehicle, and accordingly, when assembling the air-conditioning case for the mini-vehicle, As shown in FIG. 4, a case member 41 and a case member 42 are directly joined to each other to form an air-conditioning case 1 with zero intervening case extension members 43 shown in FIG. On the other hand, when assembling the air-conditioning case of a normal automobile, as shown in FIG. 6, a case member 41 and a case member 42 are joined together with a case extension member 43 interposed therebetween, as shown in FIG. It is assumed that the number of extending members 43 is, for example, one. Thereby, the air conditioning case 1
The width of the side along the joining direction of the case members 41 and 42 is
Because the width of the outer wall 43A of the case extending member 43 has been extended,
Case extension member 4 compared to air conditioning components mounted on mini vehicles
3 having the same width as the outer wall 43A can be mounted.

Then, the case member 41 of the air-conditioning case 1
The width of the side along the joining direction of the case
Can be freely changed by changing the width of the outer wall 43A or the number of the case extension members.

That is, when one case extending member is interposed, the width of the outer wall 43A of the case extending member is 10 mm.
If the width of the air-conditioning member incorporated in the air-conditioning case 1 is 10
mm, whereas if the width of the outer wall 43A of the case extension member is 15 mm, the air conditioning case 1
The width of the air-conditioning member incorporated in the device can be increased by about 15 mm. When two case extension members are interposed, and two case extension members having a width of the outer wall 43A of 10 mm are interposed, the width of the air conditioning member incorporated in the air conditioning case 1 can be increased by about 20 mm. When two case extension members having a width of the outer wall 43A of 15 mm are interposed, the width of the air conditioning member incorporated in the air conditioning case 1 can be increased by about 30 mm. Further, when the width of the outer wall 43A is 10
When a case extension member having a width of 15 mm and a case extension member having a width of the outer wall 43A of 15 mm are interposed, the width of the air conditioning member incorporated in the air conditioning case 1 can be increased by about 25 mm. However, even when the required air-conditioning capacity of a normal automobile varies from vehicle to vehicle, the air-conditioning case 1 having a width capable of incorporating an air-conditioning component capable of exhibiting the optimum air-conditioning capacity can be prepared.

As means for joining the case members 41, 42 and the case extension member 43, for example, as shown in FIG. 8 or FIG. The concave portion 46 is formed on the divided surface of the case member 42.
When the case member 41 and the case member 42 can be joined by engaging the convex portion 45 and the concave portion 46, the case extending member 43 abuts against the dividing surface of the case member 41. A concave portion 46 is formed on the abutting surface, and a convex portion 45 is formed on the abutting surface that abuts against the dividing surface of the case member 42. The case extending member 43 and the case members 41 and 42 are connected to the convex portion 45 and the concave portion. It is conceivable that joining can be performed by engagement with 46.

As shown in FIG. 8, the case members 41 and 42 and the case extension member 43 are joined together in order to improve the airtightness and prevent the case members 41 and 42 from falling off.
2. Outer walls 41A, 42A, 43A of case extension member 43
A projecting portion 47 having a through-hole 48 extending coaxially in the direction in which these members 41, 42, 43 are joined to each other is formed. A fixing tool 49 such as a bolt having substantially the same length as the dimension of the through hole 48 along the axial direction may be inserted into the through hole 48 and fixed.

As shown in FIG. 9, a projection 50 is formed near the divided surface of the outer wall 41A of the case member 41,
A hinge 51 is formed on an outer wall 42 </ b> A of the case member 42, and the hinge 51 is provided with a plurality of through holes 53 and 54 that are inserted into the projection 50. Of these, the through hole 53 is formed at a position to be extrapolated to the projection 50 when the case member 41 and the case member 42 are directly joined, and the through hole 54 is It is formed at an interval substantially equal to the width of the extension member 43 in the joining direction.

According to such a configuration, when the case members 41 and 42 are directly joined to form the air-conditioning case 1 for a mini vehicle, the through hole 53 of the hinge 51 is externally inserted into the projection 50. By doing so, it is possible to join the case members 41 and 42 with good airtightness and watertightness. Further, the case member 4 is used to form the air-conditioning case 1 of a normal automobile.
When one case extension member 43 is interposed between the first and second joints 42, the case members 41, 42 and the case extension member 43 are connected to each other by externally inserting the through hole 54 of the hinge 51 into the projection 50. It can be joined with good airtightness and watertightness.
In the case where two or more case extension members 43 are interposed, the hinge 51 is extended and the number of the case extension members 43 interposed at the same interval as the interval between the through hole 53 and the through hole 54 (not shown). In this case, a through hole may be provided.

Further, the air-conditioning case 1 has been described in which the case member 41 and the case member 42 are vertically divided into two parts, but the present invention is not limited to this configuration. The present invention can also be used in the air-conditioning case 1 having the configuration described above. Since the built-in air-conditioning parts are arranged in parallel in the horizontal direction, the case member and the case member are vertically divided with respect to the horizontal direction. The present invention can also be used in the air-conditioning case 1 having the configuration. in this way,
In the configuration in which the case member and the case member are vertically divided with respect to the horizontal direction, when the case extension member is interposed between the case members, the air-conditioning members such as the evaporator and the heater core have a vertical dimension with respect to the ventilation direction. Since it can be varied according to the width of the case extension member, the air conditioning capacity can be varied according to the type of vehicle.

Furthermore, the air-conditioning case 1 has been described for an all-in-one type integrated air-conditioning unit in which substantially all of the air-conditioning components are incorporated, but is limited to such an integrated air-conditioning unit. The present invention is also applied to an air-conditioning case of a blower unit mainly including a blower, a cooling-unit air-conditioning case mainly including an evaporator, a heater core, an air-conditioning case of a heater unit mainly including a blowout mode door, and the like. be able to.

In the case of an air-conditioning case for a blower unit, the number of intervening case extension members or the width of the side along the direction in which the case members come into contact with the air conditioner is changed, so that the blower unit extends in the axial direction of the impeller. The size of the blower can be adjusted to change the air intake volume of the blower. Also, if it becomes an air conditioning case for the cooling unit,
By changing the number of the case extending members or the width of the side along the direction in which the case members come into contact with each other, the horizontal or vertical dimension of the surface facing the ventilation direction of the evaporator is adjusted. Cooling capacity can be changed. Further, when the air conditioning case of the heater unit is used, by changing the number of interposed case extension members or the width dimension along the direction in contact with the case member, the horizontal portion of the surface facing the ventilation direction of the heater core is changed. The heating capacity of the heater core can be changed by adjusting the dimension on the direction side or the vertical direction side.

Lastly, the axial width or the radial direction of the air mixing door and the blow mode door of the heater unit is also the number of the case extension members interposed or the width dimension along the direction in which the case extension members come into contact with the case members. Can be changed by changing

[0039]

As described above, according to the present invention, in an air-conditioning unit for a mini vehicle, the case members are directly joined to each other without the interposition of the case extending member. By joining with the extension member interposed therebetween, the width of the case member of the air-conditioning case in the direction in which the case member is joined is changed, and accordingly, the case member and the case member of the air-conditioning components incorporated in the air-conditioning case are changed. While the width in the joining direction can be varied,
Since the same case member can be used for the air conditioner unit of the mini car and the air conditioner unit of the ordinary car, the number of parts is reduced as a whole, and accordingly, Since the number of molds is reduced and the production line can be simplified, cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of one case member constituting an air-conditioning case.

FIG. 2 is a perspective view showing a configuration of another case member constituting the air-conditioning case.

FIG. 3 is a perspective view showing a configuration of a case extension member according to the present invention.

FIG. 4 is a perspective view showing a process of directly joining case members to constitute an air-conditioning case for a mini vehicle.

FIG. 5 is a perspective view showing an outer shape of an air-conditioning case for a mini vehicle assembled by directly joining case members.

FIG. 6 is a perspective view showing a step of joining case members with a case extension member interposed therebetween to configure an air-conditioning case of a normal automobile.

FIG. 7 is a perspective view showing the outer shape of an air-conditioning case for a normal vehicle assembled by joining case members with a case extension member interposed therebetween.

FIG. 8 is a partially enlarged view showing a configuration for joining three members, a case member, a case extension member, and a case member.

FIG. 9 is a partially enlarged view showing another embodiment as a configuration for joining three members of a case member, a case extension member, and a case member, and FIG. 9A is a case in which the case members are joined directly. FIG. 9B shows a case where the case members are joined with a case extension member interposed therebetween.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning case 5 Partition part 10 Installation part 17 Partition part 18 Axis seat part 19 Installation part 27 Partition part 31 Axis seat part 32 Axis seat part 35 Prop part 41 Case member 42 Case member 43 Case extension member 45 Convex part 46 Recess 47 Projection Part 48 through-hole 50 protrusion 51 hinge 53 through-hole 54 through-hole

Claims (8)

[Claims] 1. An air-conditioning case comprising a plurality of case members divided into two or more so that air-conditioning parts can be built therein.
By interposing one or two or more between the divided surfaces of the divided case members, it is possible to adjust the distance between the divided surface of one case member and the divided surface of the other case member of the air conditioning case. Characteristic case extension member. 2. A split surface of the one case member or an abutment surface which abuts against another case extension member, and a split surface of the other case member or an abutment surface which abuts on another case extension member. The abutting surfaces are provided with engaging means for engaging with a dividing surface of the abutting case member or an abutting surface of another case extending member. A case extension member according to any of the preceding claims. 3. As an engagement means of the case extension member,
The one abutting surface is provided with a concave portion with which a convex portion formed on the divided surface of the one case member is engageable, and the other abutting surface is a concave portion formed on the divided surface of the other case member. 3. A projection which can be engaged with the projection.
A case extension member according to item 1. 4. The air-conditioning case is configured such that an air passage extending in a direction different from the abutting direction of the case members by being divided by the partition portion or having an air passage branched into a plurality of flow paths is defined inside. When interposed between the case members
2. The case extension member according to claim 1, further comprising a partition portion abutting on a dividing surface of the partition portion, and a support portion disposed to maintain the shape of the partition portion. 3. 5. An air-conditioning case having an installation part for installing a built-in air conditioner therein and having a case member divided in a direction that divides the installation part into two parts.
When it is interposed between the case members constituting the air conditioning case, it has an installation portion that abuts against the dividing surface of the installation portion, and a strut portion is arranged to maintain the shape of the installation portion. The case extension member according to claim 1, wherein: 6. A case member, in which a shaft seat portion for installing a door for opening and closing an air flow path and branching is defined therein, and which is divided in a direction that bisects the shaft seat portion. In order to maintain the shape of the shaft seat portion, the shaft seat portion has a shaft seat portion that abuts against the dividing surface of the shaft seat portion when interposed between the case members constituting the air conditioning case. The case extension member according to claim 1, wherein a pillar portion is disposed on the case. 7. An air-conditioning case comprising a plurality of case members divided into two or more so that an air-conditioning component can be built therein. In a case where the case members are joined to each other, one or two members are interposed between the case members. The case extension member according to any one of the above-described claims 1 to 6 can be interposed, and the case extension member is provided on one of the divided surface of the one of the divided case members or the other. A contact surface that contacts the case extension member, and a contact surface that contacts the split surface of the other case member of the divided case member or another case extension member. An air-conditioning case provided with an engagement means for engaging a division surface of a member or another case extension member. 8. A method of assembling an air-conditioning case having a plurality of case members divided into two or more so that air-conditioning parts can be built therein, wherein a space is provided between a division surface of the case member and a division surface of the case member. 7. After the one or more case extending members according to any one of claims 1 to 6 are interposed between the case members, the case member and the case extending member are engaged with each other. The method for assembling an air-conditioning case according to claim 1, wherein when two or more case extending members are interposed, the case extending members are also engaged with each other by engaging means to assemble the air-conditioning case.