JPH1054579A - Ceiling embedded type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop the operation of a blower fan at the time when an inlet grille is not at an upper limit position, in an air conditioning operation, and thereby to improve the safety at the time of removal and fitting of a filter. SOLUTION: In a ceiling embedded type air conditioner having a turbo fan 11, an inlet grille 9 positioned below the turbo fan 11 and a motor 140 for vertically moving the inlet grille 9, a limit switch detecting whether the inlet grille 9 is at an upper limit position or not and a controller 160 stopping the operation of the turbo fan 11 at the time when it is detected by the limit switch that the inlet grille 9 is not at the upper limit position, are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of a fan in a ceiling-mounted type air conditioner when a suction grill starts to descend or rises to an upper limit position.

[0002]

2. Description of the Related Art There is known a ceiling-mounted type air conditioner in which a suction grill having a filter mounted thereon is supported on the lower surface of a decorative panel, and the suction grill is moved up and down by an elevating device. This type of air conditioner has an advantage that the filter can be easily attached and detached while the suction grill is lowered to a low place, so that the filter can be easily cleaned and replaced.

[0003]

By the way, it is not preferable from the viewpoint of safety to attach and detach the filter while operating the air conditioner because the blower fan is rotating even when the suction grill is lowered. Therefore, in the instruction manual and the like, it is required to temporarily stop the operation of the air conditioner when lowering the suction grill.

[0004] However, it is troublesome to perform such an operation using a remote controller or the like, and some users lower the suction grill while operating the air conditioner. In addition, when the blower fan is temporarily stopped (when the room temperature is equal to the set temperature) or when the number of revolutions is low (such as when the wind setting is a breeze), the air conditioner is operated. In some cases, the suction grill was lowered without noticing that

It is an object of the present invention to provide an embedded ceiling air conditioner that automatically stops a blowing fan when a suction grill is lowered.

[0006]

According to the first aspect of the present invention,
In a ceiling-mounted air conditioner having a blower fan, a suction grill located below the blower fan, and a grill elevating means for raising and lowering the suction grill, it is detected whether or not the suction grill is at an upper limit position. And a blower fan control means for stopping the operation of the blower fan when the grill position detector detects that the suction grille is not at the upper limit position during the air-conditioning operation. Features.

According to the present invention, during air-conditioning operation,
When the intake grill is lowered to clean the filter, and the grill position detecting unit detects that the intake grill is not at the upper limit position, the blower fan control unit operates to stop the blower fan. When the suction grill is lowered during the air-conditioning operation, the blower fan is stopped, so that the safety is improved and the trouble of stopping the blower fan by remote control operation is eliminated, thereby improving the usability.

According to a second aspect of the present invention, there is provided a ceiling-embedded air conditioner having a blower fan, a suction grill located below the blower fan, and grill elevating means for raising and lowering the suction grill. Grill position detection means for detecting whether or not the grill is at the upper limit position, and during air-conditioning operation, when the grill position detection means detects that the suction grill is not at the upper limit position, the operation of the blower fan is performed. And a blower fan control unit that restarts the operation of the blower fan when the grille position detecting unit detects that the suction grille is at the upper limit position.

According to this invention, by lowering the suction grille during the air-conditioning operation, when the grill position detecting means detects that the suction grille is not at the upper limit position, the blower fan is stopped by the blower fan control means. . Then, when the suction grill is lifted after the filter cleaning is completed, and the grill position detecting means detects that the suction grill is at the upper limit position, the blower fan is rotated by the blower fan control means. Since the stop and rotation of the fan are controlled in accordance with the elevation of the suction grill, the safety is improved, and the remote control operation is not required, thereby improving the usability.

According to a third aspect of the present invention, there is provided a blower fan, a suction grill located below the blower fan, grill elevating means for raising and lowering the suction grill, a temperature sensor for detecting a temperature, and a temperature sensor. In the ceiling embedded air conditioner having a blowing fan forced stop means for forcibly stopping the blowing fan when there is no output of the detection signal,
In the electric circuit of the temperature sensor, a switch that closes only when the suction grill is at an upper limit position is interposed in series.

According to the present invention, when the suction grill is lowered and the switch is opened, the output of the temperature sensor is interrupted, which is equivalent to the disconnection of the electric circuit of the temperature sensor, and the forced blowing fan stopping means is activated. And the blower fan is stopped. Then, when the intake grill is raised to the upper limit position and the switch is closed, the output of the temperature sensor is conducted, which is equivalent to the normal return of the electric circuit of the temperature sensor, and the blower fan is operated. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigerant circuit diagram for explaining the structure of a general refrigerant circuit. In FIG. 1, reference numeral 300 denotes a multi-type air conditioner. The air conditioner 300 is configured such that a plurality of indoor units 303a, 303b, and 303c embedded in a ceiling are connected in parallel to one outdoor unit 302 by a refrigerant pipe.

In the outdoor unit 302, 304 is a variable capacity compressor and 305 is a rated (constant capacity) compressor connected in parallel. Reference numeral 306 denotes a four-way valve, which is set to a solid line state during the cooling operation and to a broken line state during the heating operation. The refrigerant discharged from the compressors 304 and 305 flows in a solid arrow state during the cooling operation and flows in a broken arrow state during the heating operation. An outdoor heat exchanger 307 is arranged in parallel.

The outdoor heat exchanger 307 functions as a condenser during a cooling operation and as an evaporator during a heating operation. 308 is a receiver tank. Reference numeral 309 denotes an accumulator, which is a blow pipe 310 of the two compressors 304 and 305.
Is connected to

On the other hand, as shown in FIG. 1, the indoor unit 303a incorporates strainers 311a and 312a, an indoor heat exchanger 313a, a flow divider 319a, and the like. The indoor heat exchanger 313a functions as an evaporator during the cooling operation and as a condenser during the heating operation. Reference numeral 314a denotes an indoor electric expansion valve. The opening degree of the indoor electric expansion valve 314a is controlled by a pulse motor built in the indoor electric expansion valve 314a, and is fully opened at 480 pulses and fully closed at 0 pulses.

Reference numeral 318a denotes an auxiliary pressure reducer. According to the present embodiment, although not shown in detail, the auxiliary pressure reducer is provided with a flow path resistance formed of an orifice plate for reducing the flow path area. And
Downstream of the flow path resistance during the heating operation, a bag net-like rectifying tapered in a triangular pyramid shape toward the downstream in order to make the size of bubbles generated in the refrigerant flowing through the refrigerant pipe substantially uniform during the heating operation. A member ("screen") is provided.

The other units in the indoor units 303b and 303c are the same as the units in the indoor unit 303a, and therefore are given substantially the same reference numerals and will not be described.

In the multi-type air conditioner 300 having such a configuration, the indoor units 303a, 303
When the heating operation is performed on all of the indoor units b and 303c, the indoor electric expansion valves 314a, 314b, and 314c of the indoor units 303a, 303b, and 303c are set to the opening degrees according to the heating load of the indoor units. On the other hand, in the outdoor unit 302, the operation states of the two compressors 304 and 305 are controlled based on the total value of the heating load of each indoor unit.

Here, for example, one indoor unit 303
If only the heating load of “a” is “0” (the heating loads of the other indoor units 303b and 303c are not “0”), the heating operation of this one indoor unit 303a is stopped. Specifically, the operation of the indoor blower (not shown) is stopped, and the pulse motor of the indoor electric expansion valve 314a is set to 8
Set to 5 pulses.

As described above, even when the heating operation is stopped, the indoor electric expansion valve 314a is set to be slightly opened so that even if condensed refrigerant is accumulated in the indoor heat exchanger 313a, the accumulated refrigerant is removed. This is for returning to the outdoor unit 302 via the slightly open indoor electric expansion valve 314a.

Also, even if bubbles are generated in the refrigerant flowing through the flow divider 319a or the bent portion of the pipe, the refrigerant containing the bubbles is decompressed through, for example, a flow path resistance formed of an orifice and then downstream. Since the air bubbles pass through a bag net-shaped rectifying member tapering in a triangular pyramid shape, the size of bubbles is adjusted to be substantially uniform through this rectifying member, so that the refrigerant noise generated from the indoor electric expansion valve 314a is a so-called “shear”. The sound of the flowing refrigerant is greatly silenced.

Next, the indoor unit 303b during the heating operation
Will be described. Specifically, the indoor blower (not shown) is rotated, and the opening degree of the indoor electric expansion valve 314b is adjusted according to the heating load of the indoor unit 303b. Here, the adjustment is to slightly reduce the pressure-reducing resistance value with respect to the heating load. For example, if the valve opening should be set to about 23%, the valve opening should be set to about 25% and about 2%.
% (Set the valve opening large).

As described above, when the pressure reducing resistance is somewhat reduced, the above-described auxiliary pressure reducer 318b is provided to compensate for the shortage (2%) of the resistance caused by the reduction. Therefore, the state of the refrigerant in the indoor unit 303b during the heating operation is as follows. First, the refrigerant in the gas-liquid mixed state condensed in the indoor heat exchanger 313b is once depressurized by the auxiliary decompressor 318b, and then depressurized again by the indoor electric expansion valve 314b whose valve opening is set to be slightly larger. Here, since the valve opening is somewhat large, the generation of refrigerant noise can be suppressed to a small level. Then, the refrigerant that has been decompressed by the indoor electric expansion valve 314b and is in a liquid state is returned to the outdoor unit 302. Therefore, even in the indoor unit 303b during the heating operation, the refrigerant noise is unlikely to be generated as in the indoor unit 303a during the stop of the heating operation.

Next, during the cooling operation, since the state of the refrigerant passing through the indoor unit 303a (the indoor electric expansion valve 314a) is almost liquid, the indoor electric expansion valve 314a
Is smaller than at the time of heating that passes through the indoor electric expansion valve 314a in a liquid / gas mixed state.

FIG. 5 shows an indoor unit 303a embedded in a ceiling.
FIG. The indoor unit 303a has a unit body 2 made of sheet metal housed in a ceiling interior 1, a central suction port 3 and four outlets 4 on the outer peripheral part, and covers a ceiling surface 6 so as to cover a ceiling hole 5. And a suction grille 9 having an air inlet 8 in the center.

Reference numeral 10 denotes an indoor blower including a turbo fan (blowing fan) 11 and a fan motor 13 mounted on a top plate 12, reference numeral 14 denotes a nozzle port for guiding room air from the intake port 8 to the turbo fan 11, and reference numeral 15 denotes a nozzle port. Is the inner rising part 1
This is a drain pan having 5a and an outer rising portion 15b and formed of styrene foam in an angular ring shape. still,
Reference numeral 313a denotes a plate-fin type indoor heat exchanger which is annularly arranged on the discharge side of the turbo fan 11 so as to surround the fan. Reference numeral 17 denotes a heat insulating material wound around the peripheral surface of the unit main body 2, reference numeral 21 denotes a baffle for guiding the air heat exchanged by the heat exchanger 16 to the blowout port 4, and reference numeral 22 denotes a hanging device for the unit main body 2. Suspension bolts for hanging from ceiling beams, 2
Reference numeral 4 denotes a filter attached to the downstream side of the suction grille 9.

With reference to FIGS. 2 to 4, the mechanical structure of the main part of the indoor unit 303a of this embodiment will be described. The suction grille 9 is supported via four suspension cords 31 so as to be able to move up and down. As the four suspension strings 31, a resin wire or a metal wire having a vinyl coating on the outer periphery is used, but a dial code may be used. As shown in FIG. 4, one end 31a of the four suspension strings 31 is connected to the hook 90a of the suction grill reinforcing member 90, and the other end 31b of two of the four suspension strings 31 of the four suspension strings 31 is
The other ends 31c of the remaining two suspension strings 31 are respectively wound around the main pulley 100B via the rope guide 200 or an auxiliary pulley (not shown).

The suction grill reinforcing member 90 is fixed to the two sides of the suction grill 9 with screws or the like, and, as described above, functions as a hook for the four suspension strings 31.
It also serves to reinforce the suction grille 9 and to prevent the filter 24 (FIG. 4) mounted on the suction surface of the suction grille 9 from laterally shifting.

A total of four main pulleys 100A, 100B
Are connected to both ends of the shaft 110 one by one, as shown in FIG. A hole is formed in each of the main pulleys 100A and 100B.
A and 100B are loosely fitted to the shaft 110 so as to freely rotate. A fixed portion 120 is fixed to the shaft portion of the shaft 110 via a plurality of screws or the like, and a rotational force transmitting means (such as a coil spring, a plate spring, or an electromagnet) is provided between the fixed portion 120 and the main pulleys 100A and 100B. Hereinafter, it is referred to as “coil spring”.) 130 is interposed. In addition, 125 is a ring which rotates freely,
If the weight of the suction grill 9 is applied to the four suspension strings 31 by the weight of the coil spring 130, the fixed portion 1
20, the main pulleys 100A and 100B and the ring 125 are friction-welded, and the four suspension strings 31 are fed out / rewinded with the rotation of the shaft 110. However, when an excessive load is applied to the four suspension strings 31, the main pulley 100
A and 100B idle.

Further, according to this embodiment, a drive system 150 for raising and lowering the suction grille 9, that is, a clutch including the main pulleys 100A and 100B, the shaft 110, and the rotational force transmitting means 130, and a suction grill described later. A drive system 150 including a lifting motor 140 and the like is shown in FIG.
As shown in (1), they are collectively arranged on a support plate 151 extending into the opening of the unit body 2.

This support plate 151 is, as shown in FIG.
The drive system 150 is fixed to the decorative panel 7 and the drive system 150 is fixed to the decorative panel 7 side. A controller 160 for controlling the air conditioner is provided in the opening of the unit body 2 so as to face the support plate 151. The controller 160 and the support plate 151 extend into a so-called air intake opening of the unit body 2.
That is, although the support plate 151 extends to the area 190A and the controller 160 extends to the area 190B, their presence does not obscure the air intake function. The remaining space 170 is formed so that air can be sufficiently taken in.

While the drive system 150 is fixed to the decorative panel 7, the controller 160 is fixed to the unit body 2.

To describe the drive system 150 in more detail, the shaft 110 has two bearings 15 on a support plate 151.
It is rotatably supported via 2.

A gear 153 is fixed substantially at the center of the shaft portion of the shaft 110.
4, the gear 154 is fixed to the output shaft of the suction grille elevating motor 140 described above. Reference numeral 141 denotes a motor capacitor, and 143 denotes a timer (for correction).

Referring to FIG. 2, a pull switch (operation switch) 51 for raising and lowering suction grill 9 is provided.
Is provided. The output of the pull switch 51 is input to the controller 160. In the decorative panel 7, a limit switch 5 is provided on the bottom surface of the concave portion 7a that can accommodate the suction grill 9 (the surface on which the back surface of the suction grill 9 contacts).
2 are provided. The limit switch 52 is turned off, for example, when the suction grille 9 is separated from the upper limit position (the bottom surface of the concave portion 7a), and is turned on, for example, when the suction grille 9 is at the upper limit position. And the limit switch 52
Is output to the controller 160.

The lifting operation of the suction grill 9 of the grill lifting device configured as described above will be described. Pull switch 51
Then, the suction grill elevating motor 140 rotates forward to drive the drive system 150, and the suction grill 9 starts to descend via the suspension string 31. When the suction grill 9 descends, the limit switch 52 changes from the ON state to the OFF state. The hanging string 31 is completely extended and the suction grill 9 reaches the lowermost position, or the pull switch 5
When 1 is pulled, the drive of the suction grill elevating motor 140 is stopped, and the suction grill 9 stops descending. When the pull switch 51 is pulled again in the stopped state, the suction grill lifting / lowering motor 140 rotates in the reverse direction to drive the drive system 150, and the suction grill 9 is raised. When the suction grill 9 reaches the upper limit position, the limit switch 52 changes from the OFF state to the ON state, and the drive of the suction grill lifting / lowering motor is stopped.

Next, referring to FIG. 7, the temperature control is stopped and restarted and the
The means for controlling the stop and restart of the operation will be described.

When the limit switch 52 is turned off, for example, due to the start of the lowering of the suction grill 9 from the upper limit position, for example, an output as a lowering start signal is output to the controller 160 via the voltage lowering circuit 505. Conversely, when the limit switch 52 is turned on, for example, due to the suction grille 9 rising to the upper limit position, an output as a rise stop signal (or an output of 0) is output to the controller 160 via the step-down circuit 505. (If the output is 0, the output is cut off).

When an output as a descent start signal is input, the controller 160 activates a timer 501 that measures, for example, two seconds as a predetermined time, and outputs a control signal to a driver circuit 502 that drives the fan motor 13. The output is cut off, thereby stopping the fan motor 13 and stopping the turbo fan 11. At the same time, a control signal for fully closing the indoor electric expansion valve 314a is output,
The heat exchange action of the indoor heat exchanger 313a is stopped. The interruption of the control signal output to the driver circuit 502 and the output of the control signal to the indoor electric expansion valve 314a are continued until the time measured by the timer 501 elapses. Even if chattering occurs in the limit switch 52, the chattering is canceled before the time measured by the timer 501 elapses.
Even if the output as the descent start signal becomes unstable, the interruption of the output of the control signal or the like is stably continued.

When the output as the rising stop signal or the disconnection of the output is inputted, the controller 160 restarts the output of the control signal to the driver circuit 502, thereby driving the fan motor 13 and the turbo fan. 11 will be rotated. At the same time, the indoor electric expansion valve 3
By outputting a control signal for setting the opening 14a to an opening related to the setting of the temperature control, the heat exchange action of the indoor heat exchanger 313a is restarted. However, until the timer 501 is started by the output of the descending start signal and the timer processing ends, even if the ascent stop signal is output, the output of the control signal to the driver circuit 502 and the indoor electric expansion valve 3
The output of the control signal to 14a remains off. As described above, even if chattering occurs in the limit switch 52, the chattering is canceled before the time measured by the timer 501 elapses. Therefore, even if the output as the rising stop signal becomes unstable, the turbo fan 11 Forced stop and restart are not repeated.

Note that the controller 160 is connected to the driver circuit 5
When the output of the control signal to the control signal 02 is restarted, a wind setting command (light wind, weak wind, strong wind,
(Automatic), that is, a control signal including a wind power setting command is output. Therefore, unless a new remote control operation is performed, a control signal including a wind setting command according to the previous remote control operation (before the suction grill 9 is lowered) is output, and the turbo fan 11 is set before the suction grill 9 is lowered. It rotates at the same rotation speed as the rotation speed. However, when the wind power setting is automatic, the controller 160 outputs a control signal including a command of the wind power setting in proportion to the calculation of the temperature control in order to realize the wind power related to the temperature control by capturing the room temperature. .

Also, when the controller 160 outputs a control signal for opening the indoor electric expansion valve 314a to the opening degree related to the setting of the temperature control, the controller 160 can also operate the remote controller and calculate the temperature control by taking in the indoor temperature. A control signal including a command to set an opening degree for obtaining a proportional refrigerant flow rate is output.

Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. Step S
In 1, the limit switch 52 is turned off because the suction grille 9 starts lowering by operating the pull switch 51.
Is determined. If it is determined that the limit switch 52 has been turned off, the process proceeds to step S2, in which the timer 501 is preset, the timer 501 is started, and the process proceeds to step S3, where the flag F
To 1. Thereafter, the process proceeds to step S6, in which the power supply to the fan motor 13 is stopped to forcibly stop the turbo fan 11, the indoor electric expansion valve 314a is fully closed, and the process returns to step S1.

On the other hand, if it is determined in step S1 that the limit switch 52 is not OFF, the process proceeds to step S4, where it is determined whether the flag F is 1.
If the flag F is 1, the process proceeds to step S5, and it is determined whether or not the time measured by the timer 501 has reached a predetermined time, for example, 2 seconds. If the time of the timer 501 has not reached, for example, 2 seconds, the process proceeds to step S6, in which the energization of the fan motor 13 is stopped to forcibly stop the turbo fan 11, and the indoor electric expansion valve 314a is fully closed. Then, the process returns to step S1. If the time measured by the timer 501 reaches, for example, 2 seconds, the process proceeds to step S7, where the flag F is reset to 0, and further proceeds to step S8 to energize the fan motor 13. To restart the turbo fan 11, open the indoor electric expansion valve 314a by a predetermined amount, and return to step S1.

However, if it is determined in step S4 that the flag F is 0, the limit switch 52 is turned off.
Since N is NO (NO in step S1) and the flag F is 0, it means that the suction grill 9 is stopped at the upper limit position (the bottom surface of the decorative panel).
Then, the flag F is returned to 0, and furthermore, step S8
Then, the turbo fan 11 is operated, the indoor electric expansion valve 314a is opened by a predetermined amount, and the process returns to step S1.

Next, a case where chattering occurs in the limit switch 52 when the suction grille 9 starts to descend will be described. When chattering occurs, that is, when the limit switch 52 is repeatedly turned OFF and ON, the flow of the processing in steps S1, S2, S3, and S6 and the processing in steps S1, S4, S5, and S6 are performed in accordance with the repetition. After chattering is eliminated after the flow is alternately repeated, the former flow is stabilized.

That is, it is determined that the limit switch 52 is OFF when the suction grill 9 starts to descend (YES in step S1).
If this is the case, the turbo fan 11 is forcibly stopped in step S6 through the processing in steps S2 and S3, and the indoor electric expansion valve 314a is fully closed. Thereafter, the chattering determines that the limit switch 52 is ON (step S1).
If NO), the process goes through steps S4 and S5, but of course, at this stage, for example, the time measurement of 2 seconds by the timer 501 has not been completed, so the process proceeds from step S5 to step S6, and the turbo fan 11 And the fully closed state of the indoor electric expansion valve 314a is maintained.

If the limit switch 52 is once turned off at the start of the lowering of the suction grill 9, even if the limit switch 52 is turned on by chattering, the chattering is performed because the timer 501 is preset in the immediately preceding step S2. Unless, for example, two seconds have elapsed for which the cancellation can be determined, the forced stop of the turbo fan 11 and the fully closed state of the indoor electric expansion valve 314a are maintained. In addition, the limit switch 52 is continuously turned off by eliminating the chattering.
, The turbo fan 1 goes through steps S2 and S3.
1 is forcibly stopped. Therefore, even when chattering occurs, the turbo fan 11 is continuously forcibly stopped without repeating the forced stop and restart of the operation of the turbo fan 11.

Next, a case where chattering occurs in the limit switch 52 near the upper limit position when the suction grill 9 is raised will be described. When the suction grill 9 reaches the upper limit position and the limit switch 52 is turned on, the timer 5 is set in step S2 immediately before the suction grill 9 reaches the upper limit position.
01 is started, and the flag F is set to 1 in step S3, so that the processing of steps S4 to S5 is performed. However, since 2 seconds have not elapsed at this stage, naturally, step S6 is performed. Holds the forced stop of the turbo fan 11 and the like. Thereafter, if it is determined that the limit switch 52 is OFF by chattering (YES in step S1), the forced stop of the turbo fan 11 and the like are held in step S6 through steps S2 and S3.

When the chattering is eliminated during the repetition of this processing, the limit switch 52 is continuously turned on.
(NO in step S1), but in steps S4 and S5
After the processing of step S, until, for example, two seconds elapse, step S
6, the forced stop of the turbo fan 11 and the like are maintained. Thereafter, for example, it is determined that 2 seconds have elapsed (YE in step S5).
S) When the flag F is returned to 0 in step S7, the operation of the turbo fan 11 is restarted in step S8.

That is, if the limit switch 52 is kept ON due to the cancellation of chattering after the start of the time counting process of the timer 501 (NO determination is repeated in step S1), the process proceeds to steps S4 and S5 for 2 seconds. After the forced stop of the turbo fan 11 in step S6 is maintained, the turbo fan 11 is returned to the normal operation in step S8. Therefore, even if chattering occurs, the forced stop of the turbo fan 11 and the restart of the operation are not repeated, and the normal operation of the turbo fan 11 can be returned after the chattering is eliminated.

According to the present embodiment, when the limit switch 52 is turned off at the start of the lowering of the suction grill 9, the turbo fan 11 is forcibly stopped by the operation of the controller 160, and the indoor electric expansion valve 314a is fully closed. As a result, the temperature control is stopped, so that when the suction grill 9 is lowered to a low place to clean the filter, safety and economy are improved, and a remote control operation for stopping the turbo fan 11 is performed. It is unnecessary and the usability is improved.

When the limit switch 52 is turned off at the start of the lowering of the suction grill 9, the timer 501 is started and the forced stop of the turbo fan 11 is maintained for, for example, two seconds. When the limit switch 52 is turned on by the rise up to
For example, the forced stop of the turbo fan 11 is maintained for 2 seconds after the start of the operation of the limit switch 52.
Therefore, even if chattering occurs, the forced stop of the turbo fan 11 and the restart of the operation are not repeated, so that unnecessary power is not consumed. In addition, a reduction in the failure rate can be realized.

FIGS. 9 and 10 are explanatory diagrams for explaining the configuration of the second embodiment. In the case of the present embodiment, as shown in FIG. 9, the limit switch 52 described in the first embodiment is connected to a circuit 602 connecting a temperature sensor 601 for detecting the room temperature and a controller 160.

The controller 160 includes a temperature sensor 601
The airflow control and the temperature control corresponding to the operation command of the remote controller (not shown) are performed by taking in the detection value of. Then, the turbo fan 11 is forcibly stopped, and the indoor electric expansion valve 314a is fully closed to stop the temperature control. This is a control that has existed conventionally.

In the case of the present embodiment, when the limit switch 52 is turned off at the start of the lowering of the suction grill 9, it is equivalent to the disconnection of the circuit 602 of the temperature sensor 601.
When the controller 160 is activated, an alarm is output,
The turbo fan 11 is forcibly stopped, and the indoor electric expansion valve 31
4a is fully closed.

That is, as shown in FIG. 10, when the limit switch 52 is turned off, the controller 160 gives a start command to the alarm unit 605 to start the alarm unit 605 and output a control signal to the driver circuit 502. Is shut off, the fan motor 13 is stopped, and the turbo fan 11 is forcibly stopped. At the same time, a control signal for fully closing the indoor electric expansion valve 314a is output, whereby the indoor electric expansion valve 314a is fully closed, and the temperature control is stopped.

Note that in the second embodiment,
The limit switch 52 is connected in series to the temperature sensor 601 for detecting the room temperature. If the temperature sensor detects a break in the circuit and outputs an alarm (for example, a temperature sensor for detecting the outside air temperature), the limit switch 52 is connected thereto. Then, the same function and effect can be obtained.

The technical idea of the flowchart described with reference to FIG. 8 can be applied to the present embodiment. In this case, even if the limit switch 52 causes chattering when the suction grill 9 starts lowering and ascends to the upper limit position, the influence of the chattering can be eliminated.

In this embodiment, the same effect as that described in the first embodiment can be obtained.

[0062]

According to the present invention, during air-conditioning operation,
When the suction grill is not at the upper limit position, the operation of the blower fan is stopped, so safety is improved and
Usability is improved.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram illustrating a configuration of a refrigerant circuit of the present invention.

FIG. 2 is a perspective view showing an embodiment of a ceiling-mounted air conditioner according to the present invention.

FIG. 3 is a plan view showing a suction grill.

FIG. 4 is a perspective view showing a state where the suction grille is suspended.

FIG. 5 is a longitudinal sectional view of the ceiling-mounted air conditioner.

FIG. 6 is an explanatory view of a main part of an electrical configuration for stopping a suction grille according to the present invention.

FIG. 7 is an explanatory view of a main part of an electrical configuration for stopping and restarting operation of the turbo fan according to the present invention.

FIG. 8 is a flowchart showing a procedure for controlling stop and restart of operation of the turbo fan.

FIG. 9 is an explanatory diagram illustrating a configuration of a second exemplary embodiment of the present invention.

FIG. 10 is an explanatory diagram illustrating an electrical configuration according to a second embodiment.

[Explanation of symbols]

 2 Unit body 7 Decorative panel 9 Suction grill 11 Turbo fan 13 Fan motor 24 Filter 31 Suspension cord 52 Limit switch 65 Stop position detection sensor 100A, 100B Main pulley 110 Shaft 130 Rotating force transmitting means 140 Elevating motor 150 Drive system 160 Controller 314a Indoor electric expansion valve 501 timer

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[Procedure amendment]

[Submission date] September 30, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

Next, referring to FIG. 6 , the temperature control is stopped and restarted, and the
The means for controlling the stop and restart of the operation will be described.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

Next, with reference to the flowchart shown in FIG. 7, the operation of the present embodiment. Step S
In 1, the limit switch 52 is turned off because the suction grille 9 starts lowering by operating the pull switch 51.
Is determined. If it is determined that the limit switch 52 has been turned off, the process proceeds to step S2, in which the timer 501 is preset, the timer 501 is started, and the process proceeds to step S3, where the flag F
To 1. Thereafter, the process proceeds to step S6, in which the power supply to the fan motor 13 is stopped to forcibly stop the turbo fan 11, the indoor electric expansion valve 314a is fully closed, and the process returns to step S1.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction contents]

FIGS. 8 and 9 are explanatory diagrams for explaining the configuration of the second embodiment. In the case of the present embodiment, as shown in FIG. 8 , the limit switch 52 described in the first embodiment is connected to a circuit 602 connecting a temperature sensor 601 for detecting the indoor temperature and a controller 160.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

That is, as shown in FIG. 9 , when the limit switch 52 is turned off, the controller 160 gives a start command to the alarm unit 605 to start the alarm unit 605 and output a control signal to the driver circuit 502. Is shut off, the fan motor 13 is stopped, and the turbo fan 11 is forcibly stopped. At the same time, a control signal for fully closing the indoor electric expansion valve 314a is output, whereby the indoor electric expansion valve 314a is fully closed, and the temperature control is stopped.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0060

[Correction method] Change

[Correction contents]

The technical idea of the flowchart described with reference to FIG. 7 can be applied to the present embodiment. In this case, even if the limit switch 52 causes chattering when the suction grill 9 starts lowering and ascends to the upper limit position, the influence of the chattering can be eliminated.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram illustrating a configuration of a refrigerant circuit of the present invention.

FIG. 2 is a perspective view showing an embodiment of a ceiling-mounted air conditioner according to the present invention.

FIG. 3 is a plan view showing a suction grill.

FIG. 4 is a perspective view showing a state where the suction grille is suspended.

FIG. 5 is a longitudinal sectional view of the ceiling-mounted air conditioner.

FIG. 6 shows the operation of stopping and restarting the operation of the turbofan according to the present invention .
It is a principal part explanatory view of the electrical structure to be achieved.

FIG. 7 shows a procedure for controlling the stop and restart of the operation of the turbo fan .
It is a flowchart which shows.

FIG. 8 is a view for explaining the configuration of the second embodiment of the present invention .
FIG.

FIG. 9 illustrates an electrical configuration according to a second embodiment .
FIG.

[Description of Signs] 2 Unit body 7 Decorative panel 9 Suction grill 11 Turbo fan 13 Fan motor 24 Filter 31 Suspension cord 52 Limit switch 65 Stop position detection sensor 100A, 100B Main pulley 110 Shaft 130 Rotary force transmitting means 140 Lifting motor 150 Drive system 160 Controller 314a Indoor electric expansion valve 501 Timer

Claims (3)

[Claims] 1. An embedded ceiling air conditioner having a blower fan, a suction grill located below the blower fan, and grill elevating means for raising and lowering the suction grill, wherein the suction grill is at an upper limit position. Grill position detection means for detecting whether or not the suction grille is not at the upper limit position by the grill position detection means during air-conditioning operation;
A ceiling fan-type air conditioner, comprising: a blowing fan control unit for stopping the operation of the blowing fan. 2. A ceiling-embedded air conditioner having a blower fan, a suction grill located below the blower fan, and grill elevating means for raising and lowering the suction grill, wherein the suction grill is at an upper limit position. Grill position detection means for detecting whether or not the suction grille is not at the upper limit position by the grill position detection means during air-conditioning operation;
And a blower fan control unit that restarts the operation of the blower fan when the grill position detection unit detects that the suction grille is at the upper limit position while stopping the operation of the blower fan. Ceiling-mounted air conditioner. 3. A blower fan, a suction grill located below the blower fan, a grill elevating means for raising and lowering the suction grill, a temperature sensor for detecting a temperature, and no output of a detection signal from the temperature sensor. In a ceiling-mounted type air conditioner having a blower fan forced stop means for forcibly stopping the blower fan, the electric circuit of the temperature sensor includes a switch that is closed only when the suction grille is at an upper limit position. A ceiling-mounted air conditioner characterized by interposing in series.