JP3552851B2 - Ceiling-mounted air conditioner - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to control for raising or lowering a suction grill in an in-ceiling type air conditioner.
[0002]
[Prior art]
2. Description of the Related Art In general, a ceiling-mounted air conditioner that supports a suction grill so as to be able to move up and down on a lower surface of a decorative panel by using a motor for lifting and lowering is known. This type of filter has an advantage that the filter can be replaced in a low place because the suction grill can be lowered to a low place when the filter is replaced.
[0003]
When the suction grill is lowered and stopped at the lower limit position, the lift motor is stopped by a signal from the limit switch that detects the lower limit position, and when the suction grill is raised and stopped at the upper limit position, the limit that detects the upper limit position The lifting motor is stopped by the signal from the switch.
[0004]
When stopping the suction grill at the upper limit position, the suction grill is raised and then stopped until the four corners of the suction grill are uniformly brought into close contact with the lower surface of the decorative panel so that the suction grill does not tilt. I have.
[0005]
[Problems to be solved by the invention]
Conventionally, a limit switch is used to stop the suction grill at the upper limit position or the lower limit position, so that the number of parts and electric wiring increase, which hinders cost reduction and increases the failure rate. .
[0006]
Therefore, an object of the present invention is to reduce the number of parts and electrical wiring, to reduce the cost and the failure rate, to stop the suction grill at the upper limit position or the lower limit position, and to stop at the upper limit position. In some cases, an object of the present invention is to provide an in-ceiling air conditioner capable of correcting the inclination of a suction grill.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, one end of a suspension string is fixed to the suction grill, the other end of the suspension string is wound around a pulley, a motor for lifting and lowering is connected to the pulley, and the motor for lifting and lowering is operated. In the ceiling-embedded type air conditioner for extending / rewinding the hanging string and lifting / lowering the suction grill, One end of each of the plurality of suspension strings is fixed to the suction grill, and the other end of each suspension string is wound around an individual pulley connected to the motor for lifting and lowering, respectively. A current consumption detecting means for detecting a current consumption of the lifting motor, and a detection result of the current consumption detecting means when the suction grill is raised. , When any of the hanging strings exceeds the value when reaching the upper limit position, Stop command means for outputting an operation stop command, and input of an operation stop command from the stop command means. Wait for a certain time after receiving Motor stopping control means for stopping the lifting motor.
[0008]
According to the present invention, when the suction grill is moved upward, the current consumption of the lifting / lowering motor is in a certain state, but when the suction grill reaches the upper limit position, the load on the lifting / lowering motor increases, and the current consumption becomes a predetermined value. Is increased above the set value of. When the current consumption detecting means detects that the current consumption of the elevating motor exceeds a predetermined set value, an operation stop command is output to the motor stop control means, and the elevating motor is stopped by the motor stop control means. This causes the suction grill to stop.
[0010]
According to the present invention, when the operation stop command is output from the stop command means, the elevating motor is stopped after the elapse of the predetermined time, so after the suction grill reaches the upper limit position, for a predetermined time, The lifting motor rotates to correct the inclination of the suction grill.
[0011]
The invention according to claim 2 is The ceiling-mounted air conditioner according to claim 1, The stop command means outputs an operation stop command when the detection result of the current consumption detecting means exceeds a value at the time when the hanging string has reached the lower limit position during a lowering operation of the suction grille, The motor stop control means is operable to stop the elevating motor upon receipt of an operation stop command from the stop command means when the suction grill is lowered.
[0012]
According to the present invention, since the rotation of the motor for lifting and lowering is continued even if the suction grill is lowered to the lower limit position, the rotation of the pulley functions to unwind the suspension string after all the suspension string has been paid out. The load on the motor for lifting and lowering when the rotation of the pulley draws out the suspension string is relatively small, and therefore the current consumption detecting means detects a relatively small current consumption. However, after the rotation of the pulley unwinds the suspension string, the load of the elevating motor at the time of rewinding becomes a relatively large load equal to or greater than the weight of the suction grille. Detects large current consumption. When the current consumption detecting means detects an increase in the current consumption by a predetermined value or more, an operation stop signal is output from the stop command means, and the motor stop control means stops the elevating motor.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0016]
FIG. 4 is a longitudinal sectional view of the ceiling-mounted air conditioner. In FIG. 4, reference numeral 50 indicates the air conditioner. The air conditioner 50 has a unit body 2 made of sheet metal housed in a ceiling interior 1, a central suction port 3 and air outlets 4 on four sides of an outer peripheral portion, and covers a ceiling surface so as to cover a ceiling hole 5. 6 and a suction grille 9 having an air inlet 8 in the center.
[0017]
Reference numeral 10 denotes a blower including a turbo 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, reference numeral 15 denotes an inner rising portion 15a and outer rising portion. A drain pan 16 having a portion 15b and formed of styrofoam in an angular ring shape is a plate-fin type heat exchanger 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 wind guiding portion for guiding the air heat exchanged by the heat exchanger 16 to the outlet 4, and reference numeral 22 denotes a hanging device for the unit main body 2. Suspension bolts 24 for suspending the ceiling beam are filters attached to the downstream side of the suction grille 9.
[0018]
Referring to FIGS. 1 to 3, suction grille 9 is supported via four suspension strings 31 so as to be able to move up and down. The four suspension strings 31 are formed by applying a vinyl coating to the outer periphery of a resin wire or a metal wire, but may be a dial code. As shown in FIG. 3, one end 31a of the four suspension strings 31 is connected to the hook 90a of the suction grill reinforcement member 90, and the other end 31b of the two 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 100A via the rope guide 200 or an auxiliary pulley (not shown).
[0019]
The suction grill reinforcing member 90 is fixed to two sides of the suction grill 9 by screws or the like, and, as described above, functions as a hook for the four suspension cords 31, as well as reinforcing the suction grill 9 and further suction. It also serves to prevent lateral displacement of the filter 24 (FIG. 4) mounted on the suction surface of the grill 9.
[0020]
As shown in FIG. 2, the four main pulleys 100 </ b> A and 100 </ b> B are connected to both ends of the shaft 110 one by one. A hole is formed in each of the main pulleys 100A and 100B, and each of the main pulleys 100A and 100B is loosely fitted to the shaft 110 so as to freely rotate through the hole. 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. Reference numeral 125 denotes a freely rotating ring. When the self-weight of the suction grille 9 is applied to the four suspension strings 31, the fixed portion 120, the main pulleys 100A and 100B, and the ring 125 Are frictionally joined, and as the shaft 110 rotates, the four suspension strings 31 are fed out / rewinded. However, when an excessive load is applied to the four suspension strings 31, the main pulleys 100 </ b> A and 100 </ b> B run idle against the spring force of the coil spring 130.
[0021]
Further, according to this embodiment, a drive system 150 for raising and lowering the suction grill 9, that is, a clutch including the above-described main pulleys 100 </ b> A and 100 </ b> B, the shaft 110, and the rotational force transmitting means 130, and a suction grill raising / lowering motor described later As shown in FIG. 1, a drive system 150 including a (DC motor) 140 and the like are collectively arranged on a support plate 151 extending into an opening of the unit main body 2.
[0022]
The support plate 151 is fixed to the decorative panel 7 as shown in FIG. 2, and the above-described 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.
[0023]
The drive system 150 is fixed to the decorative panel 7, whereas the controller 160 is fixed to the unit body 2.
[0024]
Describing the drive system 150 in more detail, the shaft 110 is rotatably supported on a support plate 151 via two bearings 152.
[0025]
A gear 153 is fixed substantially at the center of the shaft portion of the shaft 110, and a gear 154 meshes with the gear 153. The gear 154 is fixed to the output shaft of the suction grille elevating motor 140 described above. Reference numeral 141 is a motor capacitor, and 143 is a timer (for correction).
[0026]
Referring to FIG. 1, a pull switch (operation switch) 51 is provided as an instruction unit for raising and lowering suction grille 9.
[0027]
Next, with reference to FIG. 5, a description will be given of a means for stopping the elevating motor 140 when the suction grill 9 reaches the upper limit position or the lower limit position.
[0028]
The controller 160 outputs a control signal for controlling the forward and reverse rotations of the elevating motor 140 in accordance with an instruction from the pull switch 51. The controller 160 outputs a control signal for controlling the normal rotation and the reverse rotation of the elevating motor 140 to the driver circuit 305. The driver circuit 305 has a function of driving the elevating motor 140 at a predetermined speed in response to a control signal from the controller 160.
[0029]
When the suction grill 9 is raised by rotating the lifting / lowering motor 140 in one direction, the consumption current Ic output by the driver circuit 305 is, for example, about 170 mA while the suction grill 9 is not at the upper limit position. However, when the suction grill 9 reaches the upper limit position (the position where at least one corner (or side) of the suction grill 9 contacts the decorative panel 7), the rotation speed of the main pulleys 100A and 100B is reduced or stopped, and 11, the load on the motor 140 increases by the amount of rotation of the motor 140 against the frictional force generated between the rotation of the motor 11 and the current Ic consumed by the motor 140 output by the driver circuit 305. Increase. At this time, a consumption current Ic of, for example, about 300 mA to 350 mA flows.
[0030]
When the suction grill 9 is lowered by rotating the lifting motor 140 in the other direction, the current consumption Ic of the lifting motor 140 is, for example, about 60 mA while the suction grill 9 is not at the lower limit position. However, even after the suction grille 9 reaches the lower limit position, the driver circuit 305 rotates the elevating motor 140, so that the current consumption Ic increases from, for example, 100 mA to about 170 mA.
[0031]
That is, when the elevating motor 140 rotates even after the suction grille 9 reaches the lower limit position, the pulleys 100A and 100B rotate so as to rewind the suspending string 31 after all the suspending strings 31 have been drawn out. When the pulleys 100A and 100B rotate so as to rewind the suspension string 31, a load is applied to the elevating motor 140 substantially equal to when the suction grille 9 is raised, so that the current consumption Ic of the elevating motor 140 is For example, it increases from 100 mA to about 170 mA.
[0032]
On the other hand, the driver circuit 305 is connected to a consumed current detecting unit 307 via the amplifying unit 303. The current consumption detecting means 307 constantly detects the current consumption Ic of the lifting / lowering motor 140, and the detected current consumption Ic is input to the controller 160.
[0033]
The controller 160 outputs a command to stop the operation of the lifting / lowering motor 140 when the current consumption Ic reaches 300 mA (first set value X) or more from the state of 170 mA while the lifting / lowering grill is being raised, When the elevating grill is descending and the current consumption Ic has reached 100 mA (second set value Y) or more from the state of 60 mA, the operation stop command of the elevating motor 140 is output.
[0034]
When the operation stop command of the elevating motor 140 is output, the output of the control signal to the driver circuit 305 is cut off, and the driving of the elevating motor 140 is stopped. However, when the elevating grill is being raised and the current consumption Ic has reached 300 mA (first set value X) or more from the state of 170 mA, even if the operation stop command of the elevating motor 140 is output, In this case, the output of the control signal to the driver circuit 305 is not interrupted until a predetermined time (for example, 4 seconds) is counted by the timer 309, and the control signal to the driver circuit 305 is measured when, for example, 4 seconds are counted. Is cut off, and the drive of the elevating motor 140 is stopped.
[0035]
When the suction grille 9 is raised, there is a difference in the rewinding time of the four suspension strings 31, 31 fixed to the suction grille 9. Therefore, even if one suspension string side completely reaches the rising limit position, The remaining suspension string may not reach the ascending limit position, and the suction grille 9 may not be completely lifted. The time difference of 4 seconds described above is the time required for completely lifting each hanging string.
[0036]
Next, the operation of the embodiment will be described with reference to FIGS.
[0037]
First, in step S1, it is determined whether or not the pull switch 51 has been operated. The operation of the pull switch 51 is performed, for example, by preparing a pull-down bar and pulling the pull switch 51 using this.
[0038]
When the pull switch 51 is operated, in step S2, a control signal for rotating the elevating motor 140 forward is output from the controller 301 and input to the driver circuit 305 to rotate the elevating motor 140 forward and to perform suction. The grill 9 is lowered. In step S3, the current consumption Ic output from the driver circuit 305 to the elevating motor 140 is detected by the current consumption detection means 307. In this case, the detected value of the consumed current Ic is, for example, about 60 mA, because the suction grille 9 is lowered at a position halfway until reaching the lower limit position.
[0039]
In step S4, it is determined again whether the pull switch 51 has been operated. When the pull switch 51 is operated, the process proceeds to step S8, in which the current to the elevating motor 140 is interrupted to stop the suction grill 9, but when the pull switch 51 is not operated, the process proceeds to step S5. The controller 160 determines whether or not the current consumption Ic has reached, for example, 100 mA or more as the second set value Y. If the current consumption Ic has not reached the second set value Y, the process returns to step S3. However, if the current consumption Ic has reached the second set value Y, the process goes to step S6, and the controller 160 stops the operation. A signal is output.
[0040]
Then, in step S7, the controller 301 cuts off the control signal output to the driver circuit 305, thereby cutting off the current to the elevating motor 140 and stopping the suction grille 9. Then, the process proceeds to step S9.
[0041]
In step S9, it is determined whether the pull switch 51 has been operated. If the pull switch 51 is not operated, the process returns to step S8. However, if the pull switch 51 is operated, the process proceeds to step S10, where a control signal for reversely rotating the elevating motor 140 is output from the controller 301, and the driver circuit 305, the motor 140 is rotated in the reverse direction, and the suction grill 9 is raised. In step S11, the current consumption Ic of the elevating motor 140 is detected by the current consumption detection means 307. In this case, the detected value of the consumed current Ic is, for example, about 170 mA, because the suction grille 9 rises at a position halfway up to the upper limit position.
[0042]
In step S12, it is determined again whether the pull switch 51 has been operated. If the pull switch 51 has been operated, the process proceeds to step S13, where the controller 301 cuts off the current to the elevating motor 140, and stops the suction grille 9. However, when the pull switch 51 is not operated, the process proceeds to step S14, and the controller 160 determines whether the current consumption Ic has reached the first set value X, for example, 300 mA or more. If the current consumption Ic has not reached the first set value X, the process returns to step S10. However, if the current consumption Ic has reached the first set value X, the controller 160 sends the timer 309 to the timer 309 in step S15. After the start instruction is output, the process proceeds to step S16.
[0043]
In step S16, the timer 309 that has input the start instruction starts. The set time of the timer 309 is, for example, 4 seconds. In step S17, it is determined whether the time measured by the timer 309 has reached the set time, for example, 4 seconds. If the time measured by the timer 309 has passed 4 seconds, the process proceeds to step S18, and after the controller 301 outputs an operation stop signal, the process proceeds to step S19. In step S19, the controller 301 having issued the operation stop signal cuts off the control signal output to the drive circuit 305, whereby the elevating motor 140 is stopped and the suction grill 9 is stopped. Then, the process returns to step S1.
[0044]
That is, when the suction grille 9 reaches the upper limit position, the elevating motor 140 is stopped after the set time of the timer 309 is measured for 4 seconds, and the elevating motor 140 rotates during the four seconds. Subsequently, the main pulleys 100 </ b> A and 100 </ b> B rotate with the rotation of the shaft, the suspending string 31 is strongly rewound, and the four corners of the suction grill 9 are almost surely adhered to the decorative panel 7.
[0045]
Note that a rotary pull switch is adopted as the pull switch 51, and when the switch is repeatedly pulled, the suction grill elevating motor 140 repeats “forward rotation”, “stop”, “reverse rotation”, The suction grill 9 repeats the operations of "down", "stop", "up", and "stop" in this order.
[0046]
Since the suction grill repeats descending, stopping, rising, and stopping in order by pulling the rotary pull switch, the suction grill can be stopped at an arbitrary position by a simple operation.
[0047]
According to the present embodiment, in the process of lowering the suction grille 9, the pulling switch 51 is pulled as described above (S4), so that the suction grille 9 stops lowering (S8). The grill 9 can be temporarily stopped. Although not shown in FIG. 1, an air cleaning filter 24 (FIG. 4) is mounted on the upper part of the suction grille 9, so that the suction grille 9 is pulled down from the ceiling surface 6 as shown in FIG. When the operation is temporarily stopped, operations such as replacement and cleaning of the filter 24 can be performed at a low place. Therefore, compared to the case of working at a high place, not only the work is facilitated, but also the safety of the work can be improved.
[0048]
That is, according to the present embodiment, by operating the pull switch 51 to drive the suction grille elevating motor 140, the shaft 110 rotates, and the main pulleys 100A, 100A, 100B is rotated, and the suspension string 31 wound around the main pulleys 100A and 100B is paid out / rewinded, whereby the suction grill 9 is automatically moved up and down. Then, it can be lowered to a low place (or an arbitrary position) and then maintenance can be performed.
[0049]
Furthermore, since only one suction grill elevating motor 140 needs to be provided, the increase in cost is small, and the structure is simpler and less troublesome than when a plurality of suction grill elevating motors 140 are provided. Further, when an excessive load is applied, the clutch operates and the shaft 110 idles, so that the burnout of the suction grille lifting / lowering motor 140 is prevented.
[0050]
According to the present embodiment, when the suction grill 9 descends, the current consumption Ic supplied to the elevating motor 140 is detected, and when the current consumption Ic increases from 60 mA to 100 mA, for example, the suction grill 9 is activated. Assuming that the lower limit position has been reached, the current to the lifting / lowering motor 140 is cut off, the lifting / lowering motor 140 is stopped, and the suction grille 9 is thereby stopped. As compared with the case of stopping at the lower limit position using, the number of parts is small, the configuration is simple, the cost can be reduced, and the failure rate can be reduced.
[0051]
When the intake grill 9 is raised, the current consumption Ic supplied to the lifting / lowering motor 140 is detected. For example, when the current consumption Ic increases from 170 mA to 300 mA, it is considered that the intake grill 9 has reached the upper limit position. Then, the current to the lifting / lowering motor 140 is interrupted, and the lifting / lowering motor 140 is stopped, thereby stopping the suction grille 9. Therefore, the motor is stopped at the upper limit position using a mechanical configuration such as a limit switch. Compared to the case, the number of parts is small, the configuration is simple, the cost can be reduced, and the failure rate can be reduced.
[0052]
In addition, when the suction grille 9 is lifted by the suspension strings 31, the suction grille 9 may be lifted in an inclined state in some cases because the lengths of the four suspension strings 31 are not always equal. .
[0053]
According to this embodiment, even if the suction grill 9 is lifted in an inclined state, when the upper limit position is reached, the timer 309 is operated to measure a predetermined time (4 seconds), and then the suction grill 9 is lifted and lowered. Since the rotation of the motor 140 is stopped, the rotation of the main pulleys 100A and 100B is continued until all the suspension strings 31 are completely wound up to that point, so that the suction grill 9 is completely rotated until it becomes horizontal. And completely adhere to the decorative panel 7. In this case, among the four suspension strings 31, the main pulleys 100A and 100B on which the suspension string 31 has already been wound are stopped against the rotation on the shaft of the shaft 110 as described above. I do.
[0054]
In addition, even when the length of the four suspension strings 31 is unbalanced when the suspension string 31 is unwound, for example, when the suction grille 9 is finally unwound, the main pulleys 100A and 100B are stopped, so that the suspension string 31 Since the unbalance in length is absorbed, the suction grille 9 is completely adhered to the decorative panel 7, and there is no gap there.
[0055]
Further, in the present embodiment, the configuration in which the suction grille 9 is stopped at the upper limit position after being raised is realized by a configuration using a small number of components, such as using the controller 160, the current consumption detection means 307, and the timer 309. In addition, since the number of parts is small, the cost can be reduced and the failure rate is low.
[0056]
The raised suction grille 9 may be configured to be fixed to the decorative panel via suction grille locking means (not shown). However, this locking means is not essential, and is omitted in the present embodiment. I have. As a simple suction grill locking means, referring to FIG. 1, it is possible to provide a magnet 43 on the decorative panel 7 and lock the suction grill 9 with the magnet 43.
[0057]
As described above, the present invention has been described based on one embodiment, but it is apparent that the present invention is not limited to this.
[0058]
After the suction grille 9 reaches the upper limit position, the main pulleys 100A, 100B frictionally engaged with the main pulleys 100A, 100B also function as absorbing means for absorbing the difference in length between the suspension strings 31, 31 fixed to the left and right sides of the suction grille 9. The invention is not limited to the combination of the shaft 11 and the timer 309. For example, a lever may be provided between the main pulley 100B and the rope guide 200 to raise the suspension string 31 by a spring force.
[0059]
In this case, when the suction grill 9 is inclined and reaches the upper limit position, of the left and right sides of the suction grill 9, the tension of the suspension string 31 on the side that first reaches the upper limit position is increased, and the spring force is increased. The suspension string 31 is rewound to the extent that the lever is pulled down. According to this, the side which has not reached the upper limit position in the suction grill 9 can be raised to the upper limit position.
[0060]
In addition, the left and right rope guides 200 may be urged upward by spring force. When the suction grille 9 reaches the upper limit position by inclining, the tension of the suspension string 31 on the side of the left and right sides of the suction grille 9 which first reaches the upper limit position increases, thereby opposing the spring force. The rope guide 200 is pushed down, and the suspended string 31 is rewound by the amount of pushing down. Accordingly, the side of the suction grill 9 that has not reached the upper limit position can be raised to the upper limit position.
[0061]
【The invention's effect】
According to the first aspect of the present invention, when the suction current rises and the detection result of the current consumption detection means exceeds a predetermined set value, an operation stop command is output to stop the elevating motor. When the suction grill reaches the upper limit position, the suction grill can be stopped. Since the number of parts is small, the cost can be reduced and the failure rate can be reduced.
[0062]
Claim 1 According to the invention described above, when the current consumption exceeds the set value when the suction grill is raised, the elevating motor is stopped after a predetermined time elapses. The four corners of the grill can be brought into close contact with the bottom surface of the ceiling-mounted air conditioner to correct the inclination of the suction grill and stop the suction grill.
[0063]
Claim 2 According to the described invention, when the suction grill reaches the lower limit position and the current consumption becomes equal to or more than the set value when the suction grill is lowered, the elevating motor can be immediately stopped. Also in this case, the number of parts is small, so that the cost and the failure rate can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a ceiling-mounted air conditioner according to the present invention.
FIG. 2 is a plan view showing a suction grill.
FIG. 3 is a perspective view showing a state in which a suction grille is suspended.
FIG. 4 is a longitudinal sectional view of the ceiling-mounted air conditioner.
FIG. 5 is an explanatory diagram of a main part of an electric configuration of the present invention.
FIG. 6 is a diagram showing a processing flow in a preceding stage of the present invention.
FIG. 7 is a diagram showing a processing flow in a later stage of the present invention.
[Explanation of symbols]
2 Unit body
7 Makeup panel
9 Suction grill
24 Filter
31 Hanging string
65 Stop position detection sensor
100A, 100B Main pulley
110 shaft
130 torque transmission means
140 Lifting motor
150 drive system
160 controller
303 amplifier
305 driver circuit
307 Current consumption detecting means
309 timer

Claims (2)

One end of the suspension string is fixed to the suction grill, the other end of the suspension string is wound around a pulley, a motor for lifting and lowering is connected to the pulley, and the motor for lifting and lowering is operated to draw out / wind the suspension string. Return, in the ceiling embedded air conditioner to raise and lower the suction grill,
One end of each of the plurality of hanging strings is fixed to the suction grill, and the other end of each of the hanging strings is wound around an individual pulley connected to the lifting / lowering motor, respectively.
Current consumption detection means for detecting current consumption of the lifting motor,
Stop command means for outputting an operation stop command when a detection result of the current consumption detecting means at the time of raising operation of the suction grille exceeds a value when any of the hanging strings has reached an upper limit position. When,
An embedded ceiling air conditioner, comprising: motor stop control means for stopping the elevating motor after a predetermined time has elapsed after receiving an operation stop command from the stop command means. The stop command means,
At the time of the lowering operation of the suction grill, when the detection result of the current consumption detecting unit exceeds a value at the time when the hanging string has reached the lower limit position, an operation stop command is output,
The motor stop control means,
2. The ceiling-mounted air conditioner according to claim 1 , wherein when the suction grill is lowered, the lift motor is stopped upon receiving an operation stop command from the stop command unit. 3.

Images