Case assembling structure of blower unit

Details Case assembling structure of blower unit Case assembling structure of blower unit

1999-06-23

2001-03-27

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

C415S206000, C415S212100, C415S214100, C029S428000, C029S890035, C454S139000, C264S328100

Reexamination Certificate

active

06206633

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a blower unit for a vehicle air conditioner. More particularly, the present invention relates to a case assembling structure for securing a bell-mouth portion between upper and lower case portions of a blower unit.
2. Description of Related Art
In a conventional blower unit, a bell-mouth portion is interposed between an upper case portion for introducing air and a lower case portion for blowing air, and both of the upper and lower case portions are fastened by using a screw member, so that a case assembling structure of the upper and lower case portions is made simple. Each of the upper and lower case portions is made of resin. An air introduction port for introducing air is provided in the upper case portion, and a door for opening and closing the air introduction port is accommodated within the upper case portion. On the other hand, the lower case portion forms therein an air-blowing passage, and a fan is accommodated within the lower case portion. Further, an air leading port through which air is introduced from the upper case portion to the fan within the lower case portion is provided in the bell-mouth portion. However, in the conventional blower unit, when a case portion for the blower unit is molded from a die, the case portion is not readily removable from the die, and each case portion must be divided into plural complex parts to enable removal from the die.
SUMMARY OF THE INVENTION
The inventors of the present invention experimentally produce a case of a blower unit shown in
FIGS. 4A
,
4
B,
4
C. The case includes an upper case portion
101
, a lower case portion
102
, and a bell-mouth portion
103
. When the upper case portion
101
, the lower case portion
102
and the bell-mouth portion
103
are assembled, a first member D
1
integrated with the upper case portion
101
and a second member D
2
integrated with the lower case portion
102
are connected to form a duct D. The upper and lower case portions
101
,
102
and the first and second members D
1
, D
2
are fastened by screwing members screwed into holes
5
-
8
. The bell-mouth portion
103
is inserted and held between the upper and lower case portions
101
,
102
by fastening pressure of the screwing members.
A door for opening and closing an air introduction port
10
is accommodated in the upper case portion
101
, and an attachment boss portion
13
for attaching a motor for driving the door is provided on an outer wall surface of the upper case portion
101
to protrude from the outer wall surface of the upper case portion
101
. The attachment boss portion is disposed at a position to be covered by the first member D
1
of the duct D, as shown in FIG.
4
A. Therefore, when the upper case portion
101
is molded from resin by using a die, it is difficult for the upper case portion
101
to be removed from the die after a resin molding. That is, because the first member D
1
of the duct D and the attachment boss portion
13
are overlapped in the up-down direction, the first member D
1
or the attachment boss portion
13
is caught by the die even when the upper case portion
101
is divided into two division parts in an up-down direction. Thus, it is necessary to divide the upper case portion
101
into plural complex division parts so that each division part is removed from a die during a resin molding.
In view of the foregoing problems, it is an object of the present invention to provide a blower unit having first and second case portions and a bell-mouth portion interposed between the first and second case portions each of which is readily removed from a die after a resin molding.
According to the present invention, a case of a blower unit includes a first case having an air introduction port for introducing air, a second case portion for accommodating a fan, a bell-mouth portion interposed between the first and second case portions, and an attachment boss portion protruding from an outer wall surface of the first case portion. A duct for forming an air passage through which air blown by the fan flows is integrated with the case of the blower unit. The duct is divided into a first member extending from the bell-mouth portion to cover the attachment boss portion when the first case portion and the bell-mouth portion are assembled, and a second member integrated with the second case portion. Further, the first member and second member are detachably assembled to form the duct. Thus, the attachment boss portion integrated with the first case portion is not overlapped with the duct, and each of the upper case portion, the bell-mouth portion integrated with the first member of the duct and the second case portion integrated with the second member of the duct can be readily removed in one way from a die after a resin molding. As a result, the case can be simply resin-molded in low cost.
Preferably, the bell-mouth portion is assembled between said first case portion and said second case portion by fastening said first and second case portions. Therefore, the bell-mouth portion is fixed between the first and second case portions by only pressure due to the fastening of the first and second case portions. Thus, an assembling structure of the upper case portion, the bell-mouth portion and the lower case portion can be made simple.
More preferably, the first member and the second member are fastened by using a fastening member. Therefore, a case structure including the upper case portion, the bell-mouth portion, the lower case portion and the duct can be further tightly connected to each other.


REFERENCES:
patent: 6044656 (2000-04-01), Shirota et al.
patent: 62-225413 (1987-10-01), None

Affiliated with

Also associated with

Rating

Case assembling structure of blower unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Case assembling structure of blower unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Case assembling structure of blower unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2502592