Technical Field
[0001] The present invention relates to an indoor unit of an air conditioning apparatus,
and more particularly to improvement in a ground configuration for reducing noise
terminal voltage with respect to an electrical parts box.
Background Art
[0002] In an indoor unit of a typical ceiling embedded type air conditioning apparatus,
an indoor unit body comprises a sheet metal casing formed by fabricating sheet metal
in such a way that a substantially whole area of a lower surface is opened, and a
heat insulating material to be incorporated inside the casing. Inside the indoor unit
body, a heat exchanger, an air blower, a drain pan, etc. are arranged.
[0003] On a lower surface of the drain pan, a dress panel attractively made of synthetic
resin is mounted. An air outlet and an air inlet are provided on the dress panel.
A louver for setting an air outlet direction is attached to the air outlet, and a
filter supported by an air inlet grill is fit into the air inlet.
[0004] Between the drain pan and the dress panel, an electrical parts box for containing
electrical parts or the like for electrically controlling the indoor unit is arranged.
The drain pan is made of, for example, styrofoam, and the electrical parts box is
made of fabricated sheet metal. The electrical parts box as-is is therefore not mountable
on the drain pan.
[0005] For instance, Jpn. Pat. Appln. KOKAI Publication No.
2001-235176 discloses a drain pan of an indoor unit of an air conditioning apparatus which is
formed in such a manner that an insert metal part made of sheet metal is integrally
embedded when molding styrofoam. A part of the insert metal part projects from the
drain pan, and a screw hole is provided in this projected part. Furthermore, an insert
connection is provided in the electrical parts box. Jpn. Pat. Appln. KOKAI Publication
No.
2001-235176 discloses an art in which a screw is inserted into the insert connection and fixed
thereto.
Disclosure of Invention
[0006] The electrical parts box mentioned above is made of a metallic material and contains
electrical parts. Measures for reducing noise terminal voltage are therefore necessary.
Though Jpn. Pat. Appln. KOKAI Publication No.
2001-235176 does not mention reduction of a noise terminal voltage, ground wiring for reducing
noise terminal voltage is generally configured in such a manner that one end of a
lead wire is connected to an electrical parts box, a midway part of the lead wire
is interposed between a drain pan and a dress panel, and the other end is brought
out of an indoor unit to be grounded.
[0007] Assembling work of an indoor unit is performed by putting the indoor unit in a condition
reverse to a condition in which the indoor unit is embedded in a ceiling. More specifically,
a casing, namely an indoor unit body is put on a workbench in such a way that an upper
surface is cast down and an opening section of a lower surface is cast up. An air
blower, a heat exchanger, a drain pan, and an electrical parts box are sequentially
inserted into and mounted in the casing from the opening section thereof, and a dress
panel is attached to the casing at the end.
[0008] In order to install the ground wiring, an assembler has to insert his hand into the
casing from the opening for connecting one end of a lead wire to the electrical parts
box, since the electrical parts box is already mounted in the casing. During the installation,
the assembler has to work with the lead wire and tools while avoiding the air blower,
the heat exchanger, and the drain pan that are already mounted. The installing of
the ground wiring is thus extremely troublesome.
[0009] Another method of installing the ground wiring is to connect one end of the lead
wire to the electrical parts box in advance, and insert and mount the electrical parts
box in the casing. However, in this condition, the lead wire hangs from the electrical
parts box, and the hanging lead wire may tangle with the air blower, the heat exchanger,
etc. Therefore, installation of the ground wiring is worrying. A midway part of the
lead wire is necessary to be routed in a predetermined site, and this method is also
extremely troublesome.
[0010] It is an object of the present invention to provide an indoor unit of an air conditioning
apparatus in which an installation of ground wiring is unnecessary and improvement
in assembling work can be obtained.
[0011] In order to satisfy the object, an indoor unit of an air conditioning apparatus of
the present invention comprises an indoor unit body having an openable lower surface
and containing an electrical components box, a heat exchanger, a drain pan, and air
blower inside thereof; a dress panel for closing the lower surface of the indoor unit
body; and a first insert metal part provided in the drain pan for fixing the drain
pan with respect to the indoor unit body, and a second insert metal part for attaching
and fixing the electrical parts box with respect to the drain pan; characterized in
that the first insert metal part and the second insert metal part are electrically
connected and integrally formed.
Brief Description of Drawings
[0012]
FIG. 1 is a perspective view of an indoor unit of a ceiling embedded type air conditioning
apparatus according to one embodiment of the present invention.
FIG. 2 is a perspective view of the disassembled indoor unit body according to the
embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of the indoor unit body according to the embodiment
of the present invention.
FIG. 4 is a plan view of the indoor unit body according to the embodiment of the present
invention, in which a drain pan is mounted.
FIG. 5 is a plan view of the indoor unit body according to the embodiment of the present
invention, in which a bell mouth is further mounted.
FIG. 6 is a plan view of the indoor unit body according to the embodiment of the present
invention, in which an electrical parts box is further mounted.
FIG. 7 is a partially perspective view of the indoor unit body according to the embodiment
of the present invention in which the electrical parts box is mounted.
FIG. 8 is a partially plan view of the electrical parts box according to the embodiment
of the present invention.
FIG. 9 is a partially perspective view of the electrical parts box according to the
embodiment of the present invention.
FIG. 10 is a partially perspective view of the bell mouth according to the embodiment
of the present invention in ordinary use.
FIG. 11 is a partially perspective view of the bell mouth according to the embodiment
of the present invention when slit part is cut.
FIG. 12 is a partially perspective view of the bell mouth according to the embodiment
of the present invention when an electrical parts box for control is mounted thereto.
Best Mode for Carrying Out the Invention
[0013] Hereinafter, one embodiment of the present invention will be described on the basis
of accompanying drawings (Unsigned component parts and sites in the description are
not shown in the accompanying drawings. Also, in order to avoid complication of the
drawings, there are cases where components parts and component sites purposefully
do not have sings.)
[0014] FIG. 1 is a perspective view of an indoor unit 1 of a ceiling embedded type air conditioning
apparatus according to one embodiment of the present invention which is shown from
a lower surface side. FIG. 2 is a perspective view of a disassembled indoor unit body
2. FIG. 3 is a longitudinal sectional view of the indoor unit body 2.
[0015] The indoor unit 1 of the air conditioning apparatus comprises: an indoor unit body
2 which is inserted into an opening section for installation provided in a ceiling
board from an indoor side, and suspended and fixed to so-called back of a ceiling;
and a dress panel 3 which is mounted on a lower surface of the indoor unit body 2
to be exposed from the ceiling board to the indoor side.
[0016] The indoor unit body 2 includes a casing 4 made of sheet metal, which is formed in
such a manner that a sheet metal is fabricated to form an upper surface section and
side surface sections, and a lower surface section whose whole area is opened. A heat
insulating material 5 molded by utilizing styrofoam material is attached to an inner
periphery surface of the casing. Thus, the indoor unit body 2 has a heat insulating
structure.
[0017] An air blower 6 is provided in a central part inside the casing 4, and an indoor
heat exchanger 7, which is integrally formed to be a rectangular frame shape in plan
view, is mounted in such a manner that the indoor heat exchanger 7 encloses the air
blower 6. In addition, there is a case where a pair of heat exchangers that are formed
to be an L-shape in plan view are utilized as an indoor heat exchanger 7. A drain
pump 9 is attached to a corner part of the indoor unit body 2.
[0018] The lower surface opening section of the casing 4 is closed with the dress panel
3. This dress panel 3 is molded with, for example, synthetic resin and is finished
attractively. The dress panel 3 is exposed to the indoor side from the ceiling board,
and the panel covers a gap between the opening section for installation of the ceiling
board and the peripheral surface of the indoor unit body 2.
[0019] The air blower 6 comprises a fan motor M which is attached and fixed to the upper
surface section of the casing 4 with a suitable manner, and a fan F which is attached
to a rotation axis of the fan motor M. The fan F is a multiblade type fan that makes
blowing action in such a manner that the fan F rotates to take air in from a direction
of the rotation axis and blow air out to a circumferential direction.
[0020] The indoor heat exchanger 7 is arranged opposing the circumferential direction, which
is the blowing-out direction of the fan F. A lower end part of the indoor heat exchanger
7 is inserted into the rectangular frame shaped drain pan 10 provided in the casing
4, and drain water generated through the heat exchange action of the indoor heat exchanger
7 is thereby able to be received with the drain pan 10. The drain pump 9 is attached
in such a manner that it is immersed in the drain water in the drain pan 10.
[0021] A bell mouth 12 is provided between the dress panel 3 and the air blower fan F, and
is surrounded by the drain pan 10. The bell mouth 12 includes a convergent part 12a
which is horn shaped and formed in such a manner that an air blower fan F side is
small diametered and a dress panel 3 side is large diametered, a flat part 12b integrally
provided on a large diametered side of the convergent part 12a, and a slit part 12c
provided adjacent to one lateral of the flat part 12.
[0022] An electrical parts box 13 is mounted on the flat part 12b of the drain pan 12. The
electrical parts box 13 comprises a box body 14 having a lower surface thereof opened
for containing a control substrate on which electrical parts for control are mounted,
and a lid plate 15 for openably closing the lower surface opening section of the box
body 14. Both the box body 14 and the lid plate 15 are made of fabricated sheet metal.
[0023] A fan guard 16 is attached over the large diametered side of the convergent part
12a of the bell mouth 12. The fan guard 16 secures safety even in the condition where
the dress panel 3 is detached for maintenance, since the fan guard 16 prevents a maintenance
worker from touching the fan F comprising the air blower 6.
[0024] The dress panel 3 includes a panel body 3A having a rectangular shaped outline, and
a rectangular shaped air inlet 17 is opened at a central part thereof. The air inlet
17 is provided in such a way that its shape and area substantially faces an inside
surface of the drain pan 10, and an air inlet grill 18 for supporting a filter is
detachably attached to the air inlet 17.
[0025] The air inlet grill 18 covers the casing 4 at the air inlet 17, while simultaneously
letting air circulate through the air inlet 17. The filter can be detached together
with the air inlet grill 18 during maintenance, and thus the filter and the air inlet
grill 18 can be cleaned on an indoor floor.
[0026] Air outlets 19 are provided along each of side parts of the air inlet 17. The air
outlets 19 are respectively provided at four sides of the air inlet 17, and each of
the air outlets 19 has a shape extremely long and thin in a longitudinal direction
with respect to a width direction. Also, each of the air outlets 19 is provided to
face a gap between an outside surface of the drain pan 10 and a heat insulating material
5 attached to an inside surface of the casing 4, and the air outlet 19 itself is formed
in an outwardly curved manner.
[0027] To each of the air outlet 19, a louver R of a louver mechanism is attached, and the
louver R guides a heat exchanged air to be flown out toward wide area around the dress
panel 3. At each of the four corners of the panel body 3A, an opening section for
height adjustment 20 being rectangular shaped is provided, and a dress corner panel
21 is detachably attached to each of the opening sections for height adjustment 20.
[0028] On the other hand, the casing 4 is suspended and held by four hanger bolts that are
hung from beams comprising the back of the ceiling. To explain more specifically,
hanging lugs 22A that project outward in a horizontal direction are respectively attached
to the corner parts on side surfaces of the casing 4. Each of the hanging lugs 22A
has a long hole d and a hanger bolt is inserted into the long hole d. A nut is screwed
up at downside of the insertion section.
[0029] With the above structure, the hanging lugs 22A are on upper surfaces of the nuts
and the casing 4 is thereby suspended by the hanger bolts at four places. Furthermore,
height adjustment of the casing 4 is possible by adjusting positions at which the
nuts are screwed up with respect to the hanger bolts. Height adjustment is performed
in such a manner that the dress corner panels 21 are detached and tools are inserted
from the opening sections for height adjustment 20.
[0030] The hanging lugs 22A are formed in such a way that upper edge parts of metal parts
body 22, which are formed in substantially U-shape, are folded and projected in a
horizontal direction. The metal parts body 22 are attached to the casing 4 with methods
such as spot welding. Furthermore, lower edge parts of the metal parts body 22 are
also folded and projected in a horizontal direction, and these parts are called attachment
brackets 22B.
[0031] Therefore, the attachment brackets 22B and the hanging lugs 22A are integrally formed
with the casing 4. The attachment brackets 22B are for attaching and fixing the dress
panel 3 and the drain pan 10 to the casing 4, and a detailed explanation of attachment
operation will be given later.
[0032] A part of a first insert metal part 24 and a part of the second insert metal part
25 are exposed from a lower surface of the drain pan 10. In other words, the part
of the first insert metal part 24 and the part of the second insert metal part 25
are supported inside a molding die of the drain pan 10, and the parts of the first
and second insert metal parts 24 and 25 are embedded (inserted) in the drain pan 10
as the drain pan 10 is foam molded.
[0033] The fist insert metal part 24 is for attaching and fixing the drain pan 10 to the
casing 4. The second insert metal part 25 is for attaching the bell mouth 12 and the
electrical parts box 13 to the drain pan 10. Detailed explanation on the attachment
operation will be given later.
[0034] In the indoor unit 1 of the ceiling embedded type air conditioning apparatus, indoor
air is taken in via the air inlet grill 18 and the filter as the air blower 6 is driven.
Then, the taken-in air is further taken in a direction of a rotation axis of the air
blower 6 while being guided by the bell mouth 12, and then blown out in a circumferential
direction.
[0035] The indoor air that is blown out in the circumferential direction is heat exchanged
while being circulated through the indoor heat exchanger 7 and thereby turned into
cool air during cooling operation, and thereby turned into warm air during heating
operation. The heat exchanged air is guided along a gap between the indoor heat exchanger
7 and the heat insulating material 5, and is blown out to the room from a plurality
of air outlets 19 formed in the dress panel 3.
[0036] Thus, the heat exchanged air is evenly blown out from the indoor unit 1 of the air
conditioning apparatus that is mounted on the ceiling board, and air conditioning
action with respect to the room is efficiently performed.
[0037] Next, assembling configuration of the indoor unit body 2 will be described in detail.
[0038] FIG. 4 is a plan view of the casing 4 in which a drain pan 10 is mounted, FIG. 5
is a plan view of the casing 4 on which a bell mouth 12 is further mounted, FIG. 6
is a plan view of the casing 4 in which an electrical parts box 13 is further mounted,
and FIG. 7 is a partially perspective view of the electrical parts box 13 shown in
FIG. 6 and surrounding parts thereof.
[0039] In the metal part 22, proximal end parts, namely the hanging lug 22A on the upper
side and the attachment bracket 22B on the under side, are formed to have same width
size and provided in such a way that the hanging lug 22A and the attachment bracket
22B are facing each other above and below. The hanging lug 22A has a long hole d for
inserting a hanger bolt. A part of the attachment bracket 22B projects in such a manner
that the projected part does not face the long hole d.
[0040] Corner parts of the dress panel 3 are laid over the projected parts of the attachment
brackets 22B, and fixation screws are inserted into screw holes that are provided
in both of the attachment brackets 22B and corner parts of the dress panel 3 to be
screwed up. The dress panel 3 is thereby attached to the casing 4. Thus, the projected
parts of the attachment brackets 22B do not interfere with height adjustment operation
with respect to the hanger bolts of the hanging lugs 22A.
[0041] Each of the first insert metal part 24 and the second insert metal part 25 is made
of sheet metal fabricated in a bending manner. As mentioned above, the insert metal
parts 24 and 25 are inserted into the drain pan 10 at the time of foam molding. Though
most part of the insert metal parts 24 and 25 are embedded in the drain pan 10, a
part of the insert metal parts 24 and 25 are respectively exposed out of the drain
pan 10 as indicated in FIGS. 4 to 6 with hatching.
[0042] Only a first insert metal part 24 at bottom right corner part as shown in FIGS. 4
to 6 has different shape and size from the other first insert metal parts 24 respectively
at the other corner parts. The first insert metal parts 24 at the corner parts other
than the first insert metal part 24 at the bottom right corner part have the same
shape and size with each other.
[0043] The second insert metal parts 25 are attached only at top and bottom parts on the
left side as shown in FIGS. 4 to 6, and they are not attached to top and bottom parts
on the right side. FIG. 7 is an enlarged drawing showing a side on which the second
insert metal parts 25 are attached.
[0044] In every first insert metal part 24, one part thereof projects outside from a corner
part of the drain pan 10 so that it faces the proximal end parts, namely the hanging
lug 22A and the attachment bracket 22B. In a condition where the projected part of
the first insert metal 24 is fitted to the proximal end of the attachment bracket
22B, screw holes in the projected part and the attachment bracket 22B are communicated
with each other.
[0045] The first insert metal parts 24 of the drain pan 10 are attached to the attachment
brackets 22B on the lower end part of the casing 4, by inserting fixation screws in
each of the screw holes and screwing them up. In other words, as shown in FIG. 4,
the drain pan 10 is attached and fixed to the casing 4.
[0046] The first insert metal part 24 at the bottom right corner part has a pair of rectangular
shaped exposed parts g that are provided apart from the part projected from the drain
pan 10, as shown in FIGS. 4 to 6. The rest of the first insert metal parts 24 respectively
have horizontally long shaped exposed parts h that are provided in parallel with the
parts projected from the drain pan 10. These exposed parts g and h have hole parts.
These hole parts are for engaging pins that hold the first insert metal parts 24 during
the foam molding of the drain pan 10.
[0047] As shown in FIGS. 4 to 6, circular shaped exposed parts i are provided adjacent to
the horizontally long shaped exposed parts h of the first insert metal parts 24 at
top and bottom parts on the left side. Each of these exposed parts i has a fixation
screw 26 as shown in FIG. 7. The fixation screw 26 is for fixing the projected parts
respectively provided in the first and second insert metal parts 24 and 25 with each
other.
[0048] More specifically, inside the drain pan 10, the projected part of the first insert
metal part 24 and the projected part of the second insert metal part 25 are overlapped
and tightly in contact with each other. These projected parts have screw holes to
be communicated with each other, and the fixation screw is inserted and fixed thereto.
Therefore, the parts of the insert metal parts 24 and 25 are strongly fixed with each
other.
[0049] The second insert metal part 25, which is shown in an upper part side of FIGS. 4
to 6 and shown in the right side of FIG. 7, is attached in an angle different from
a direction in which the first insert metal part 24 is attached. On the other hand,
the second insert metal part 25, which is shown in a bottom part side of FIGS. 4 to
6 and shown in the left side of FIG. 7, is attached along a direction in which the
first insert metal part 24 is attached.
[0050] As described above, a couple of the second insert metal parts 25 used in the embodiment
of the present invention have different attachment directions with respect to the
first insert metal parts 24. However, these two second insert metal parts 25 are formed
to have the completely same shape and size. In the exposed parts of the second insert
metal parts 25, a plurality of screw holes and holes used for being held during insert
fabrication are provided.
[0051] As shown in FIG. 5, screw holes provided in the flat part 12b of the bell mouth 12
communicate with screw holes of the second insert metal parts 25, when the flat part
12b is fitted to parts of the drain pan 10 where the second insert metal parts 25
are exposed. The bell mouth 12 can be fixed to the drain pan 10 by inserting fixation
screws into these screw holes and screwing the screws up.
[0052] With the condition mentioned above, the bell mouth 12 has see-through opening sections
27, each of which faces the screw hole provided in the second insert metal part 25
and having diameter larger than diameter of the screw hole. As shown in FIGS. 6 and
7, the see-through opening sections 27 respectively faces screw holes k provided in
a box body 14 of the electrical parts box 13, when the box body 14 is aligned with
the flat part 12b of the bell mouth 12.
[0053] Then, fixation screws are inserted and fixed into the screw holes of the second insert
metal parts 25 from the screw holes k of the box body 14, via the see-through opening
sections 27 of the bell mouth 12, and the box body 14 is thereby attached to the drain
pan 10 via the bell mouth 12. Incidentally, a bottom part of the box boy 14 is pressed
through to form the screw holes k in a tiered manner. Therefore, the bottom part of
the box body is strengthened.
[0054] In the vicinity of the screw holes k of the box body 14, projected parts for clearance
m are provided. These projected parts for clearance m are situated at positions facing
the heads of the fixation screws that fix the bell mouth 12 to the second insert metal
parts 25, in a condition wherein the box body 14 is closely attached to the bell mouth
12. In other words, projected parts for clearance m prevent the heads of the fixation
screws from pushing up the bottom part of the box body 14.
[0055] The electrical parts box 13 is assembled by containing a control substrate in the
box body 14 and attaching a lid plate 15 to the box body 14. Then, a fan guard 16
is attached to the bell mouth 12, and the dress panel 3 is attached to the indoor
unit body 2 as mentioned above, for assembling the indoor unit 2. The assembled indoor
unit 2 is to be carried into a place for installation, and suspended by hanger bolts.
[0056] As explained above, since the electrical parts box 13 made of sheet metal is attached
to the second insert metal parts 25 also made of sheet metal, the electrical parts
box 13 and the second insert metal parts 25 are in a conduction state. The first insert
metal parts 24 and the second insert metal parts 25, which are made of sheet metal,
are inserted in the drain pan 10, and projected parts of the first and second insert
metal parts 24 and 25 are in contact with each other and in a conduction state.
[0057] Furthermore, the projected parts of the first insert metal parts 24 and the second
insert metal parts 25 are closely fixed with each other with the fixation screws 26.
In other words, though each of the insert metal parts 24 and 25 are inserted in the
drain pan 10, the fixation screws 26 make the insert metal parts 2 and 25 securely
in the conduction state.
[0058] The first insert metal parts 24 and the attachment brackets 22B, made of sheet metal,
are fixed with each other with fixation screws and in an electrically conduction state.
The attachment brackets 22B is formed at the bottom part of the metal parts body 22
made of sheet metal, and the hanging lugs 22A are formed at the upper part of the
metal parts body 22. The attachment brackets 22B and the hanging lugs 22A are therefore
in an electrically conduction state.
[0059] The metal parts body 22 respectively having hanging lugs 22A and the attachment brackets
22B are fixed to the sheet metal casing 4 and in an electrically conductive state.
The hanging lugs 22A are suspended by metal hanger bolts and they are electrically
conductive with each other. The hanger bolts are provided on beams comprising the
ceiling and are in a grounding condition.
[0060] The indoor unit 1 is thus completed as a product when the dress panel 3 is attached
to the assembled indoor unit body 2. When the completed indoor unit 1 is carried into
a place for installation and suspended by hanger bolts, an ground path is inevitably
formed since the electrical parts box 13 is grounded via the first and second insert
metal parts 24 and 25, the casing 4, and the hanger bolts, etc.
[0061] With an adoption of the configuration according to the embodiment of the present
invention, a conventional lead wire performing as ground wiring for reducing noise
terminal voltage becomes unnecessary. Parts cost can be thus reduced, and furthermore,
operation for connecting a lead wire to the electrical parts box can be omitted. Therefore,
improvement in workability and reduction in cost is both possible.
[0062] Incidentally, since the first insert metal parts 24 and the second insert metal parts
25 are individually formed, attachment positions of the first and second insert metal
parts 24 and 25 with respect to the drain pan 10 can be varied in accordance with
design specifications. In other words, with a plurality of the first and second insert
metal parts 24 and 25, drain pans having different shapes and configurations may be
applicable.
[0063] Next, a box body 14 comprising the electrical parts box 13 will be described in detail.
[0064] FIG. 8 is a partially plan view of the box body 14 in which electrical parts to be
contained are omitted. FIG. 9 is a perspective view of the electrical parts box 14,
showing the same part as in FIG. 8, including electrical parts contained inside the
box body 14.
[0065] The electrical parts box 13 has a rectangle shape which is long in a longitudinal
direction. A terminal block base 28 is attached to a bottom part of one side part
of the box body 14. To explain more specifically, this terminal block base 28 is attached
in a slant manner over the bottom part of the box body 14 and a lateral end, and there
is a gap between the bottom part of the box body 14 and the terminal block base 28
to make a double structure.
[0066] Especially as shown in FIG. 9, a plurality of terminal blocks 29 and cord retainers
30 are attached to the terminal block base 28, and a ground symbol 31 is provided
at a location between the terminal blocks 29 and the cord retainers 30. Furthermore,
a screw through hole 32 formed by barring is provided in the vicinity of the ground
symbol, and the screw hole k is provided in the bottom part of the box body 14, at
a location facing the screw though hole 32.
[0067] A notched part 33 is provided at a corner part of the box body 14, more specifically
at a location over an attachment position of the terminal block base 28 and the bottom
part of the box body 14. In the case where a fixation screw is accidentally come off
when inserting the fixation screw into the screw through hole 32 of the terminal block
base 28 during attachment of the box body 14, the fixation screw j may be taken out
from the notched part 33.
[0068] After the indoor unit body 2 is suspended with the hanger bolts and necessary height
adjustment is finished, the air inlet grill 18 and the filter is detached for exposing
the electrical parts box 13. The lid plate 15 of the electrical parts box 13 is also
detached for exposing electrical parts and the terminal blocks 29, etc. contained
in the box body 14.
[0069] A lead wire terminal for electrical power or for signal is at least attached to the
terminal block 29, for electrically connecting the electrical parts for control with
the lead wire. Although a worker has to look up the electrical parts box 13 for performing
this connecting operation, the attachment manner in which the terminal block base
28 is slantly attached with respect to the bottom of the box body 14 makes the worker
to perform the operation easier. The improvement in workability is therefore obtained.
[0070] Next, explanation on the bell mouth 12 will be given.
[0071] FIGS. 10-12 are partially perspective views respectively showing the bell mouth 12
in ordinary use, when a slit part is cut, and when the electrical parts box for control
is attached.
[0072] As shown in FIG. 10, a slit part 12c having a rectangular shaped slit is provided
in the bell mouth 12. This slit part 12c of the bell mouth 12 is broken out when a
certain level of force is applied to the slit part 12c. In ordinary use, however,
the slit part 12c is maintained without being broken out. Therefore, when bell mouth
12 is in ordinary use, air volume is secured.
[0073] In a case of optional specification where the number of indoor units is increased
with respect to an outside unit, for example, an electrical parts box for control
40 including a control substrate has to be additionally mounted in the indoor unit.
In that case, a certain level of force is applied to the slit part 12c for removing
a part at an end part side, as shown in FIG. 11 (the slit part is cut).
[0074] In the above condition in which the slit part is removed, a plurality of ribs 35
that are parallelly provided on an extension of a flat part 12b with a predetermined
space are exposed. There is narrow space between pointy ends of these ribs 35 and
a plate surface of the flat part 12b. A lead wire 36 can be held in with the ribs
35 by embedding the lead wire 36 into the narrow space.
[0075] Then, as shown in FIG. 12, the electrical parts box for control 40 which is stored
for optional use is mounted in the taken-away slit part 12c in such a manner that
the box 40 is placed on and faces the ribs 35. Furthermore, the electrical parts box
for control 40 is fixed to the bell mouth 12 with fixation screws (when the electrical
parts box for control is attached).
[0076] In other words, the electrical parts box for control 40 for optional use can be easily
mounted only by removing the slit part 12c, without increasing the number of parts.
The ribs 35 serve as a pedestal for the electrical parts box for control 40 and also
as a guide for the lead wire 36, for being able to comply with an optional specification.
Industrial Applicability
[0077] According to the present invention, an installation of ground wiring for reduction
of noise terminal voltage during assembly of an indoor unit becomes unnecessary, and
improvement in assembling workability is possible.