JP2000220864A - Indoor unit of air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a vertical crosspiece from being seen clearly and to enable an indoor unit to look more attractive by locating the front portion of the vertical crosspiece of an air inlet and an air outlet at the rear of a horizontal crosspiece. SOLUTION: A front portion 14A of a vertical crosspiece 14 of an air inlet or an air outlet is located at the rear of a rear portion 13A of a horizontal crosspiece 13, namely at the inside. When the vertical crosspiece 14 is separated from the horizontal crosspiece 13, they may be connected each other via a rib 16. Then, when the indoor unit 10 is installed at a high location on an indoor wall surface, the vertical crosspiece 14 cannot be seen clearly and a suction grill 2 can be seen only from the horizontal crosspiece 13, thus enabling the indoor unit 10 to look more attractive. Or, furthermore, a motor bracket for fixing a motor for driving a fan to a casing may be provided with the partition wall function of a wind passage and the fixation function of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an indoor unit of an air conditioner.

[0002]

2. Description of the Related Art An example of a conventional air conditioner indoor unit is shown in FIGS. FIG. 2 is a front view of the indoor unit. The front of the indoor unit 10 mainly includes a front panel 1 and a suction grill 2.

FIG. 3 is a sectional view taken along line AA of FIG. An air filter 4 and a heat exchanger 5 are provided inside a casing comprising a front panel 1, a suction grill 2 and a main body 3.
a, 5b, 5c, drain pans 6a, 6b, fan 7, etc. are provided.

During operation of the air conditioner, the fan 7 rotates,
Refrigerant from an outdoor unit (not shown) circulates through the heat exchangers 5a, 5b, 5c. Thus, the room air is sucked into the inside of the housing from the air inlet formed in the front panel 1 and the suction grill 2, and the dust in the room air is captured in the process of flowing through the air filter 4.

Next, the room air is supplied to the heat exchangers 5a, 5b,
After being cooled or heated by exchanging heat with the refrigerant in the process of flowing 5c, the air is urged by the fan 7 and
From 11, it is guided by the louver 8 and the flaps 9 a and 9 b and blown out into the room.

The details of the suction grill 2 are shown in FIG.
(A) is a longitudinal sectional view, (B) is a partially enlarged view of (B), (C) is a view taken along the arrow (B), (D) is a arrow in (C). It is an arrow view along.

The suction grill 2 has a large number of horizontal bars 13 extending horizontally so as to be parallel to each other at a predetermined interval vertically, and is perpendicular to the horizontal bars 13 and vertically at predetermined intervals in the horizontal direction. It has a plurality of vertical rails 14 extending therethrough.

The horizontal bar 13 and the vertical bar 14 are joined to each other at their intersections, and the joints are reinforced by ribs 16.

[0009]

In the above-mentioned conventional indoor unit, as shown in FIG. 4B, the front portion 14A of the vertical bar 14 is located forward, that is, outside the rear portion 13A of the horizontal bar 13. When looking at the indoor unit 10 from the front,
Since the vertical bar 14 is clearly visible, there is a problem that the appearance of the indoor unit 10 is impaired.

[0010]

Means for Solving the Problems The first invention has been invented to solve the above-mentioned problems, and its gist is to provide an air inlet or a vertical air inlet comprising a horizontal rail and a vertical rail. An indoor unit of an air conditioner having an outlet, wherein a front portion of the vertical bar is located behind a rear portion of the horizontal bar.

Another feature is that the horizontal rail and the vertical rail are connected to each other via a rib.

The gist of the second invention is that an air conditioner is characterized in that a motor bracket for fixing a fan drive motor to a casing has a partition function of an air passage and a function of fixing the motor. In the indoor unit of the machine.

[0013] The gist of the third invention is an indoor unit of an air conditioner, wherein a backflow prevention plate is provided between the left and right side walls limiting the outlet and the horizontal member.

According to a fourth aspect of the present invention, there is provided an air pump, wherein a wall surface of an outlet portion of a drain discharge passage has a slope inclined toward the center of the drain discharge passage, and a step is provided at the outlet portion. Located in the indoor unit of the harmonizer.

The gist of the fifth invention is that a motor bracket for mounting a fan drive motor is supported by a main body case as a cantilever type so that refrigerant piping is provided between the motor bracket and the main body case. An indoor unit for an air conditioner, characterized in that a space for holding by utilizing elasticity and rigidity is formed.

According to a sixth aspect of the present invention, there is provided an air conditioner or a refrigerator having a defrost control circuit for instructing the start of a defrost operation when all of a plurality of determination circuits are turned on. (1) A determination circuit that is turned on when the integrated value of the heating operation time after the start of the heating operation reaches the first set time, wherein the air sucked into the heat source side heat exchanger for the first set time is A plurality of first determination circuits preset in accordance with the temperature range of the temperature; (2) a determination circuit which is turned on when an elapsed time after the end of the defrosting operation reaches a second set time; A plurality of second determination circuits are set in advance according to the temperature range of the air temperature sucked into the heat source side heat exchanger. (3) The air temperature To sucked into the heat source side heat exchanger and The temperature difference between the heat source side heat exchanger (TopL) and the temperature is To−TopL ≧ E ₁ × To + F ₁
Third determination circuit above the E ₁ and F ₁ a decision circuit to be ON is previously plurality set according to the temperature range of the air temperature To sucked to the heat source-side heat exchanger when a An air conditioner or a refrigerator having one or all or all of the first to third determination circuits.

According to a seventh aspect of the present invention, there is provided an air conditioner or a refrigerator having a defrost control circuit for instructing a start of a defrost operation when all of a plurality of determination circuits are turned on. It has a determination circuit that determines the start of defrosting operation based on a predetermined determination formula from the temperature of the heat source side heat exchanger and the temperature and humidity of the air sucked into the heat source side heat exchanger. In the air conditioner or refrigerator.

Another feature is that the constants in the above-mentioned determination formula are set for each of a plurality of temperature ranges and humidity ranges of the air sucked into the heat source side heat exchanger.

[0019]

An embodiment of the present invention is shown in FIG.
(A) is a longitudinal sectional view of the suction grille, (b) is a partially enlarged view of the (b) part of (b), (c) is a view taken along the arrow (b) of (b),
(D) is an arrow view along (d).

As clearly shown in FIG. 1B, the front portion 14A of the vertical bar 14 is located behind, that is, inside the rear portion 13A of the horizontal bar 13.

When the vertical bar 14 and the horizontal bar 13 are separated from each other, they may be connected to each other via the rib 16.
The other configuration is the same as that of the conventional one shown in FIGS. 2 to 4, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

However, when the indoor unit 10 is installed at a high position on the indoor wall surface, the vertical bar 14 becomes invisible,
Since the suction grill 2 appears to be composed of only the horizontal rails 13, the appearance of the indoor unit 10 is improved.

Although the embodiment in which the present invention is applied to the air inlet has been specifically described above, it goes without saying that the present invention can also be applied to the air outlet.

[0024]

According to the first aspect of the present invention, since the front part of the vertical rail is located behind the rear part of the horizontal rail, the vertical rail becomes invisible when the indoor unit is viewed, so that the appearance of the indoor unit is improved. I do.

An embodiment of the second invention is shown in FIGS. 5 to 7, and FIG. 5 is a front view showing a mounting portion of a fan and a motor.
6 is a view taken along the line BB in FIG. 5, and FIG.
It is sectional drawing which follows the A line.

As shown in FIG. 7, the fan 7 and a motor 17 for driving the fan 7 are integrated by a screw 18. A motor bracket 19 covering the motor 17 is fixed to the case 20. The motor bracket 19 is integrally formed with a partition 21 for blocking wind leaking from the right end of the fan 7.

Conventionally, as shown in FIG. 8, a bearing 17a of a motor 17 is sandwiched between a motor bracket 22 and a case 20, and is passed from an air passage 23 of a fan 7 to a control unit 24 through a right end opening of the fan 7. Since the leaking wind was blocked by the bracket 25, the dew water condensed on the heat exchangers 5b and 5c during the cooling operation passed through the gap 26 between the motor bracket 22 and the bracket 25 and entered the control unit 24, and the indoor unit There was a risk of dripping to the outside.

According to the second aspect of the present invention, since the partition 21 is formed integrally with the motor bracket 19, the conventional bracket 25 can be omitted, so that not only the cost can be reduced, but also the dew condensation water It can be prevented from invading or dripping outside the indoor unit.

FIG. 9 shows an embodiment of the third invention. Right wall 28 that limits outlet 11 and rear wall of drain pan 6a
A backflow prevention plate 30 is provided between the antireflection plate 30 and the fuel cell 29. Although not shown, a similar backflow prevention plate 30 is provided between the left side wall and the rear wall 29.

Conventionally, as shown in FIG.
Is not provided, a backflow b of room air is generated, and the backflow b contacts with the left and right side walls 28 cooled by the cool air a blown out from the outlet 11, and condensed water generated by the backflow b drops. There was a risk of soiling the room.

In the third aspect, however, the backflow b of the warm room air containing moisture is prevented by the backflow prevention plate 30, so that dew condensation does not occur near the left and right side walls 28. Therefore, it is possible to prevent the dew condensation water from dropping and soiling the room.

An embodiment of the fourth invention is shown in FIGS. 11 and 12, wherein FIG. 11 is a side view showing a drain drainage system, and FIG.
FIG. 11 is a view taken along arrow A of FIG. 11. As shown in FIG. 11, during the cooling operation of the air conditioner, drain pans are supplied from the heat exchangers 5a and 5b.
The drain dropped on 6a is discharged to the outside via the drain passage 31 and the drain hose 32.

The drain dropped from the heat exchanger 5c to the drain pan 6c enters the drain pan 6d through a passage formed in the case 34 of the drive motor 17 of the fan 7. Also, the back plate of the housing
The drain condensed on the back surface of the cooling device 33 as it is cooled by the cool air also enters the drain pan 6d.

The drain that has entered the drain pan 6d enters the drain passage 31 through the drain discharge passage 35, and is discharged through the drain hose 32.

The outlet of the drain discharge passage 35 is shown in FIG. The outlet of the drain discharge passage 35 has a gutter 36 that is inclined so as to gradually descend toward the front and two
Is composed of two partitions 37, these two partitions 37
It extends slightly forward from the front end of 36.

The inner surface of the gutter 36 comprises four wall surfaces 36a, 36b, 36c and 36d inclined toward the center of the discharge passage 35,
The walls 36c and 36d are connected to the upper ends of the walls 36a and 36b,
The inclination angles of the wall surfaces 36c and 36d are larger than those of the wall surfaces 36a and 36b.

The inner surface of the partition 37 has three wall surfaces 37a, 37a.
The lower end of the wall 37b is connected to the upper end of the wall 37a, and the wall 37c is connected to the upper end of the wall 37b.

Although the wall 37c is vertical, the wall 37a
And 37b are inclined toward the center of the discharge passage 35.
The wall surface 37b is located below and in front of the wall surface 36c of the gutter 36 with a predetermined step therebetween. Although not shown, the other partition 37 has the same configuration.

The main flow H of the drain flowing through the drain discharge passage 35 falls from the tips of the wall surfaces 36a and 36b of the gutter 36, and is guided by the wall surface 37a of the partition wall 37 and gathers at the central portion 38.
Further, the diverted stream L generated by the surface tension of the drain falls from the wall surface 36c of the gutter 36 to the wall surface 37b of the partition wall 37, and this wall surface 37b
And is gathered in the central part 38 by being guided by the wall surface 37a which is continuous with the same.

As shown in FIG. 13, the outlet of the conventional drain discharge passage 35 has a partition wall 39 composed of vertical wall surfaces 39a and 39c and a wall surface 39b perpendicular thereto, and the inner edge of the wall surface 39b is a wall surface of the gutter 40. Since it was in contact with the upper ends of 40a and 40b, the drain K flowing down on the wall surface 39b might leak to the rear through the gap y.

However, in the fourth invention, the wall surface of the outlet of the drain discharge passage 35, that is, the wall surfaces 36c, 36
d and the walls 37a and 37b of the partition 37 are sloped toward the center of the discharge passage 35, and the walls 36c and 37b
Is provided, a drain can be prevented from leaking to the rear part through the gap, and therefore, the filling used for preventing the leak can be omitted.

FIGS. 14 to 16 show a fifth embodiment of the present invention. FIG. 14 is a side view showing a laying system of a refrigerant pipe, and FIG.
FIG. 16 is a perspective view showing the vicinity of the motor bracket,
FIG. 16 is a view along arrow A in FIG.

As shown in FIG. 14, a liquid pipe 42a for distributing a liquid refrigerant to the heat exchangers 5a, 5b, 5c and the heat exchangers 5a, 5a,
A refrigerant pipe 42 is formed by covering a gas pipe 42b for returning the gas refrigerant evaporated in 5b and 5c to the outdoor unit with a heat insulating material 42c.

The motor 17 for driving the fan 7 is held by a motor bracket 41. The motor bracket 41 is cantilevered via a support base 44. The outer end of the support base 44 is It is attached to the inner surface of 3a. In addition,
The motor bracket 41 and the support base 44 are formed integrally with the case body 3.

At the time of assembling, the refrigerant pipe 42 is routed around the gap 45 between the motor bracket 41 and the side plate 3b of the case body 3, as shown in FIG.
3a is drawn into the space 43 formed between the space 3a and the inlet 46.

Here, the refrigerant pipe 42 is held in this space 43 without any pressing parts due to its elasticity and rigidity. Next, the refrigerant pipe 42 is drawn out to the outside from a hole formed in the back plate 3a through a space at a lower rear portion in the casing, and is connected to the outdoor unit.

Conventionally, as shown in FIGS. 17 and 18, the motor bracket 41 is supported at both ends by a pair of support bases 44a, 44b, and the pair of support bases 44a, 44b and the back plate 3a of the case body 3 are supported. Since the refrigerant pipe 42 was laid in the space 48 surrounded by the inner surface and the back of the motor bracket 41, the workability of the laying operation was poor.

Therefore, in order to improve workability, a notch is provided in the top plate 3c of the main body case 3, and after the refrigerant pipe 42 is laid,
Since the notch is closed by the lid 49, there is a problem that the cost of parts and assembly of the lid 49 is added.

According to the fifth aspect of the present invention, the space 43 for mounting the refrigerant pipe 42 between the motor bracket 41 and the case main body 3 is provided between the motor bracket 41 and the case main body 3 by supporting the motor bracket 41 as a cantilever. Since it is formed, the refrigerant pipe 42 can be easily accommodated in the space 43 by sliding the refrigerant pipe 42 along the inner surface of the case body 3.

The motor bracket 41 and the case body 3
The space between the refrigerant pipe 42 and the space is reduced by using the elasticity and rigidity of the refrigerant pipe 42 so that other holding parts are not required.
43 can be held.

FIG. 19 shows a refrigerant system of the air conditioner. During the cooling operation, the gas refrigerant discharged from the compressor 51 passes through the four-way switching valve 52 as shown by a dashed arrow, and the heat source side heat exchanger.
It enters 53, where it is condensed and liquefied by radiating heat to the outside air sent by the outdoor blower 59.

Next, the liquid refrigerant is adiabatically expanded by being throttled by the capillary tube 54, and then enters the use side heat exchanger 55, where it evaporates by absorbing heat from the room air sent by the fan 57. Next, the gas refrigerant returns to the compressor 51 via the four-way switching valve 52, and repeats the above.

During the heating operation, the refrigerant is circulated in the direction opposite to that during the cooling operation by switching the four-way switching valve 52 in the opposite direction as indicated by the solid arrow. During the defrosting operation, the refrigerant circulates in the same direction as during the cooling operation, as indicated by the dashed arrow, by switching the four-way switching valve 52 in the same manner as during the cooling operation.

The sensor 60 for detecting the temperature Topl of the heat source side heat exchanger 53, the sensor 61 for detecting the temperature To of the air sucked into the heat source side heat exchanger 53, and the sensor 62 for detecting the humidity Ho of the air The value is input to the controller 63, which outputs to the compressor 51 to turn it on / off and outputs it to the four-way switching valve 52 to switch it.

As shown in FIG. 20, a conventional controller 63 includes an instruction circuit 65 for an operation mode such as heating or cooling, a circuit 66 for judging an integrated result of the heating operation time after the start of the heating operation, and a time period after the end of the defrosting operation. An integrated result determination circuit 67, a determination circuit 68 based on the temperature (TopL) of the heat source side heat exchanger 53 detected by the sensor 60, and a temperature of the air sucked into the heat source side heat exchanger 53 detected by the sensor 61 (To ) And a circuit 69 for determining a difference between the temperature of the heat source side heat exchanger 53 detected by the sensor 60 (TopL),
The operation instruction circuit 70 of the compressor 51 and the temperature (TopL) of the heat source side heat exchanger 53 detected by the sensor 60 are set to a preset temperature (G
C) and a circuit 72 for determining that the defrosting operation time has reached a preset time (J time), and the above circuits 65, 66, 67, 68, 69, 70 , 71, 72
Is provided with a defrost control circuit 73 for instructing the start or stop of the defrosting operation in response to the determination result from.

The circuit 65 is turned ON when heating is designated. Circuit 66
Is turned ON when the integrated value of the heating operation time after the start of the heating operation reaches a preset time (A time). circuit
At 67, it is turned ON when the elapsed time after the end of the defrosting operation reaches a preset time (B time). In the circuit 68, the temperature (TopL) of the heat source side heat exchanger 53 is continuously set for a preset set time (C time) (C time).
Turns ON when the temperature falls below ℃).

In the circuit 69, the difference between the air temperature (To) sucked into the heat source side heat exchanger 53 and the temperature (TopL) of the heat source side heat exchanger 53 is To
ON when −TopL ≧ E × To + F. (E is a preset constant and F is a preset set temperature. In the circuit 70, it is turned ON when the compressor 51 is instructed to run. All the circuits 65, 66, 67, and 68 described above. , 69, 70 are turned ON, the defrost control circuit 73 commands the start of the defrost operation.

The circuit 71 is turned ON when the temperature of the heat source side heat exchanger 53 becomes higher than a preset temperature (G ° C.). Circuit 72
Is turned on when the defrosting operation time reaches a preset time (J time). Then, when the circuit 71 or 72 is turned on, the defrost control circuit 73 instructs the defrost operation to stop.

Since the condition that the circuits 65, 68, 69, and 70 are turned on is always satisfied when the temperature is equal to or lower than a certain outside air temperature during the heating operation, the time that is the condition that the circuits 66 and 67 are turned on is always satisfied. The start of the defrosting operation is determined only by whether or not the time has elapsed.

FIG. 23 shows the relationship between the presence / absence of frost of the heat source side heat exchanger 53, the outside air temperature, and the heating capacity when the room temperature is constant at 20 ° C. 5.The outside air temperature is 5.
Above 5 ℃ and below -8.5 ℃, frost formation is difficult. When the humidity is high such as during snowfall, the amount of frost may increase or decrease depending on the humidity even when the outside air temperature is -8.5 ° C or less.

Therefore, in the conventional controller 63,
Circuit 66 during heating operation even under low outside temperature conditions of 8.5 ° C or less
And if the time lapse condition of 67 applies, the defrosting operation is performed,
Since the heating operation is stopped during that time, there is a disadvantage that the room temperature drops and the heating feeling deteriorates.

FIG. 22 shows a first embodiment of the sixth invention. In the first embodiment, a conventional circuit 66 shown in FIG.
First to third circuits 75, 76, 78 are provided instead of 67, 69.

The first circuit 75 is provided with a heating operation time after the start of the heating operation, the first set time (A ₁ or A ₂ or
Turns ON when A ₃ ) is reached. The times A ₁ , A ₂ , and A ₃ are preset according to the temperature range of the air temperature To sucked into the heat source side heat exchanger 53.

In the range where A ₁ <A ₂ <A ₃ and To is low, the elapsed time A ₁
Turned ON, To is turned ON when the elapsed time reaches the A ₂ in the range of medium, To is the elapsed time in a high range it becomes ON when reaching the A ₃ when it reaches the.

The second circuit 76 is an elapsed time after the end of the defrosting operation.
Is the second set time (B ₁ Or B_TwoOr B_Three)
Turns ON when it reaches. Above time B₁, B_Two, B_ThreeIs B₁<B_Two
<B_ThreeAnd the air sucked into the heat source side heat exchanger 53
Preset for low, medium and high temperature ranges of temperature To
You.

The third circuit 78 calculates the difference between the air temperature To sucked into the heat source side heat exchanger 53 detected by the sensor 61 and the temperature (TopL) of the heat source side heat exchanger 53 detected by the sensor 60. It is a circuit for determining. This temperature difference To-TopL is To-TopL ≧
(E ₁ × To + F ₁ ) or (E ₂ × To + F ₂ ) or (E ₃ × To + F ₃ )
At this time, the circuit 78 is turned ON.

E ₁ , E ₂ , E ₃ and F ₁ ,
F ₂ and F ₃ are constants and have a relationship of E ₁ > E ₂ > E ₃ and F ₁ > F ₂ > F ₃ and are numerical values set in advance, but are sucked into the heat source side heat exchanger 53 It is set in advance corresponding to the low, middle, and high temperature ranges of the air temperature To. The other configuration is the same as that of the conventional one shown in FIGS. 19 and 20, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, each of the circuits 65, 75, 76, 68, 78, 70
Are turned ON, the defrost control circuit 73 commands the start of the defrost operation. In the first circuit 75 and the second circuit 76, depending on the temperature range of the air temperature To sucked into the heat source side heat exchanger 53,
By setting a plurality of set times, which are ON conditions, in the third circuit 78, each of the constants E and F is set to a plurality depending on the temperature range of the temperature To sucked into the heat source side heat exchanger 53. Since the ON start time of the circuits 75, 76, and 78 is delayed, and the heating operation time continues during that time, the heating performance at low outside air temperature is improved.

The first to third judgment circuits 75, 76,
Any one or two of 78 can be omitted.

FIG. 23 shows a second embodiment of the sixth invention. In the second embodiment, a sensor 62 for detecting the humidity Ho of the air sucked into the heat source side heat exchanger 53 is provided. Then, a circuit 79 is used instead of the determination circuit 69 in FIG.
Is provided.

This circuit 79 determines the difference between the air temperature To sucked into the heat source side heat exchanger 53 detected by the sensor 61 and the temperature (TopL) of the heat source side heat exchanger 53 detected by the sensor 60. Circuit. This temperature difference To-TopL is To-TopL ≧
In the case of K ₁ × To + L ₁ × Ho + M ₁ , the circuit 79 turns ON and other circuits
Defrost control circuit when all 65, 66, 67, 68, 70 are ON
73 instructs the start of the defrosting operation.

In the judgment formula of the circuit 79, K ₁ , K ₂ , L ₁ , L ₂ ,
M ₁ and M ₂ are constants, and are numerical values that are set in advance corresponding to the temperature range of the air temperature To sucked into the heat source side heat exchanger 53 or the humidity range of the humidity Ho of the air, K ₁ <K ₂ , L ₁ <
L ₂ , which has a relationship of M ₁ <M ₂ , and the constant K ₁ , when the temperature To and the humidity Ho of the air sucked into the heat source side heat exchanger 53 are in a low range,
L ₂ and M ₂ are applied, and constants K ₂ , L ₂ and M ₂ are applied in the range where the temperature To and the humidity Ho are high.

The constants are not limited to two types, and if necessary, the temperature range and the humidity range or the humidity range can be finely divided and constants can be set for each of the temperature range and the humidity range. Alternatively, instead of dividing the humidity range, it can be treated as a continuous function.

However, if the humidity Ho of the air sucked into the heat source side heat exchanger 53, that is, the outside air humidity is low, the amount of frost formed on the heat source side heat exchanger 53 is small and the frosting time is slow. By including the humidity condition as well as the temperature of the outside air, the start of the defrosting operation can be delayed in the case of low outside temperature and low humidity, and the heating operation can be continued during that time, so the heating low temperature performance is improved, A detailed defrosting operation instruction can be given.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the first invention, (A) is a longitudinal sectional view of a suction grill, (B) is a partially enlarged view of (B), and (C) is (B). (D) is an arrow view along arrow d in (c).

FIG. 2 is a front view of a conventional indoor unit.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

4A and 4B show details of a conventional suction grill, wherein FIG. 4A is a longitudinal sectional view of the suction grill, FIG. 4B is a partially enlarged view of FIG. 4B, and FIG. (D) is an arrow view along the d arrow in (c).

FIG. 5 is a front view showing an embodiment of the second invention.

FIG. 6 is a view taken in the direction of arrows along the line BB in FIG. 5;

FIG. 7 is a view taken in the direction of arrows along the line AA in FIG. 5;

FIG. 8 is a partial perspective view corresponding to FIG. 7, showing a conventional configuration.

FIG. 9 is a partial perspective view showing an embodiment of the third invention.

FIG. 10 is a partial perspective view corresponding to FIG. 9 showing a conventional configuration.

FIG. 11 is a side view of a drain discharge passage showing the embodiment of the fourth invention.

12 is a view as viewed in the direction of the arrow A in FIG. 11;

13 is a view corresponding to FIG. 12 and shows a conventional configuration.

FIG. 14 is a side view showing a state of laying refrigerant pipes according to the fifth embodiment of the present invention.

FIG. 15 is a perspective view showing the vicinity of a motor bracket in the embodiment.

16 is a cross-sectional view taken along the arrow A in FIG.

FIG. 17 is a perspective view corresponding to FIG. 15 showing a conventional configuration.

18 is a sectional view taken along the arrow A in FIG.

FIG. 19 is a system diagram of an air conditioner.

FIG. 20 is a circuit diagram of a conventional defrost control device for an air conditioner.

FIG. 21 shows the outside air temperature and the heating capacity of a conventional air conditioner,
It is a diagram showing the relationship with frost formation.

FIG. 22 is a circuit diagram of a defrost control device according to the first embodiment of the sixth invention.

FIG. 23 is a circuit diagram of a defrost control device according to a second embodiment of the sixth invention.

[Explanation of symbols]

 1 Front panel 2 Suction grill 4 Air filter 13 Horizontal beam 14 Vertical beam 16 Rib

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiro Ito 3-chome, Asahimachi, Nishi-Biwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture F-term in Mitsubishi Heavy Industries, Ltd. Air Conditioning Works 3L051 BJ10

Claims (9)

[Claims] 1. An indoor unit of an air conditioner having an air inlet or an air outlet comprising a horizontal rail and a vertical rail, wherein a front part of the vertical rail is located behind a rear part of the horizontal rail. An indoor unit of an air conditioner characterized by the above. 2. The indoor unit for an air conditioner according to claim 1, wherein the horizontal rail and the vertical rail are connected to each other via a rib. 3. An indoor unit of an air conditioner, wherein a motor bracket for fixing a fan driving motor to a casing has a function of partitioning an air passage and a function of fixing the motor. 4. An indoor unit of an air conditioner, wherein a backflow prevention plate is provided between left and right side walls limiting an outlet and a horizontal member. 5. An indoor unit for an air conditioner, wherein a wall surface of an outlet portion of the drain discharge passage has a slope inclined toward the center of the drain discharge passage, and a step is provided at the outlet portion. 6. A cantilever type motor bracket for mounting a fan drive motor is supported by a main body case to hold a refrigerant pipe between the motor bracket and the main body case using its elasticity and rigidity. Indoor unit for an air conditioner, characterized by forming a space for the air conditioner. 7. An air conditioner or a refrigerator equipped with a defrost control circuit for instructing the start of a defrost operation when all of a plurality of determination circuits are turned on, (1) heating after the start of a heating operation. A determination circuit that is turned on when the integrated value of the operation time reaches a first set time, wherein the first set time is determined in advance according to a temperature range of an air temperature sucked into the heat source side heat exchanger; (2) A judgment circuit that is turned on when the elapsed time after the end of the defrosting operation reaches a second set time, wherein the second set time is the heat source side heat exchange. (2) The temperature of the air sucked into the heat source side heat exchanger To and the temperature of the heat source side heat exchanger (TopL ) And the temperature difference is To−TopL ≧ E ₁ × To + F ₁
Third determination circuit above the E ₁ and F ₁ a decision circuit to be ON is previously plurality set according to the temperature range of the air temperature To sucked to the heat source-side heat exchanger when a An air conditioner or a refrigerator having one or all of the first to third determination circuits. 8. An air conditioner or a refrigerator equipped with a defrost control circuit for instructing the start of a defrost operation when all of the plurality of determination circuits are turned on, the temperature of the heat source side heat exchanger; An air conditioner or a refrigerator having a determination circuit for determining the start of a defrosting operation based on a predetermined determination formula based on the temperature and humidity of the air sucked into the heat source side heat exchanger. 9. The air conditioner or refrigeration system according to claim 8, wherein the constants in the determination formula are set for each of a plurality of temperature ranges and humidity ranges of the air sucked into the heat source side heat exchanger. Machine.