JP2000234798A - Grill elevation device of ceiling-mount-type air- conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy and reduce costs by composing a grill elevation device of a drum that is driven by an AC synchronous motor and a wire that is extended while being wound and delivered freely by the drum and providing a suspension part that is engaged to the wire for a separation member. SOLUTION: A separation member that is mounted to an air-conditioner 50 so that it can be separated freely is a grill G for detachably retaining a filter. One end of first and second wires 110 and 120 is fixed to two drums 100a and 100b, and 101a and 101 and is wound so that it can be taken up and delivered freely. The other ends of the first and second wires 110 and 120 are connected by a connection means such as a hook via a pulley 130 that is a suspension part being provided at the grill G. In this manner, by suspending the first wire 110 and the second wire 120 in a U shape and suspending the grill G at the first wire 110 and the second wire 120 via the pulley 130, the need for the idling mechanism of the drum is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grill elevating device for a ceiling-mounted air conditioner. More particularly, the present invention relates to a device for raising and lowering a grill of a ceiling-mounted air conditioner with a wire wound around a drum driven by an AC synchronous motor so as to be able to be wound up and out.

[0002]

2. Description of the Related Art Conventionally, in the case of an air conditioner used for a building or the like, an air conditioner (hereinafter, simply referred to as "grill") for gripping a filter portion has been conventionally used. The system is equipped with a device, and the filter is lowered by remote control, and the filter is removed and cleaned at a position where the cleaning operation is easy.

[0003] An example of a device for raising and lowering such a grill (hereinafter, simply referred to as "elevator") is disclosed in Japanese Patent Application Laid-Open No. 10-47750.

[0004] The lifting device described in the above publication is shown in FIG.
, A DC motor 3 for raising and lowering the grill, a timer 20 for measuring the time when the grill is lowered, a timer 21 for measuring the time when the grill is raised, and a measurement value of the timer 20 Subtraction means 22 for subtracting the value measured by the timer 21 and the DC motor 3 are rotated forward (OUT1) for a predetermined time and then reversely rotated (OU) for a predetermined time.
T2).

As described above, in the case of the lifting device described in the above-mentioned publication, since the lifting height of the grill is controlled by the timer control, the time and the rotation amount change depending on the load.
Therefore, there is a problem that the accuracy of the elevation height is not good.

Although it is theoretically possible to control the elevation by using means such as a switch or a sensor instead of the timer control, there is a problem that the cost is increased.

On the other hand, as a rotation control of the DC motor, FIG.
And 10 are conventionally known.

In this device, a rotation angle signal generating means 1 comprising shift registers R1, R2 and an adder, and a DC motor M in a predetermined direction based on a signal generated from the rotation angle signal generating means 1, And a rotation driving means 2 for rotating by an angle.

With this configuration, when A and B are 1 (binary number), the signal S1 becomes "1" (binary number), the motor M rotates forward, A is 1 (binary number), and B Is 0
At the time of (binary number), S2 becomes 1 (binary number), and the electric motor M reverses.

Assuming that the cycle of the shift pulse P is T, for example, if A = 111 (binary number) and B = 111 (binary number) are input as data to the shift registers R1 and R2, respectively, (3 × T) The electric motor M rotates forward for seconds, and A = 1 as data in the shift registers R1 and R2, respectively.
When (binary number) and B = 0 (binary number) are input, the electric motor M reverses for T seconds (see FIG. 11).

However, the rotation control shown in FIGS. 9 and 10 has a problem that an accurate rotation amount cannot be actually obtained due to the rotation inertia of the motor.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to provide an ascending / descending apparatus which can perform highly accurate ascending / descending control and has low cost.

[0013]

The lifting device according to the present invention is a device for raising and lowering a separation member detachably attached to an air conditioner main body provided on a ceiling of a building, and comprises an AC power supply. Pulse conversion means for converting the obtained sine wave input signal into a pulse signal composed of a number of pulse trains, pulse counting means for measuring the number of pulse trains of the pulse signal generated by the pulse conversion means, and the pulse signal AC synchronous motor that rotates by the same number of steps as the number of pulse trains to be applied, a drum provided on the ceiling and driven by the AC synchronous motor, and a stretchable / unwound / extendable drum. The separation member is provided with a suspension portion detachably engaged with the wire.

Further, it is preferable that the wire is stretched so as to hang down in a U-shape, two suspension portions are provided, and one end of the wire is fixed to a drum.

[0015] Further, the wire is stretched so as to hang down in a U-shape, further provided with two hanging portions, and a second drum rotatably driven by the AC synchronous motor, wherein the other end of the wire is provided. Preferably, it is fixed to the second drum.

[0016] Further, the wire hangs down in the vertical direction and has two suspending portions. The second drum is driven to rotate by the AC synchronous motor, and is fixed to the second drum so as to be able to be wound up and out. And a second wire provided so as to hang in a vertical direction, and the free ends of the wire and the second wire are preferably connected to the two suspension portions.

Further, the wire is stretched so as to hang down in a U-shape, a second AC synchronous motor identical to the AC synchronous motor, and a third drum rotatably driven by the second AC synchronous motor. And a second wire having one end fixed to the third drum and the other end fixed to the air conditioner main body, four suspension units, and four suspension units. Two of the four suspensions are detachably engaged with the wire, and the other two of the four suspensions are the second suspension.
Is preferably detachably engaged with the wire.

Further, the wire is stretched so as to hang down in a U-shape, and a second AC synchronous motor identical to the AC synchronous motor is fixed to the drum by the second AC synchronous motor. The end is fixed to the fourth drum,
A second wire stretched so as to hang down in a character-like manner, four of the hanging portions being provided, two of the four hanging portions being detachably engaged with the wire, and having the four hanging portions. Preferably, the other two of the portions are detachably engaged with the second wire.

Further, the wire is stretched so as to hang down in a U-shape, and four wires are provided. Two of the four wires are detachably engaged with the wire.
The other two of the suspensions are detachably engaged with the second wire, and the air conditioner body is provided with at least one pulley, and the wire is engaged with the four suspensions and the pulley. Is preferred.

Preferably, the suspension is a pulley.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lifting device according to the present invention.

FIG. 1 is an explanatory view showing an example of an elevating device according to an embodiment of the present invention, FIG. 2 is a perspective view showing an outline of a drive section of the elevating device of FIG. 1, and FIG. 3 is an elevating device of the present invention. FIG. 4 is a graph showing a pulse generated by the pulse converting means of FIG. 3, and FIG. 5 is a circuit showing an example of a pulse counting means used in the lifting device of the present invention. FIGS. 6, 6 and 7 are explanatory views showing another example of a method of extending a wire.

Embodiment 1 Referring to FIGS. 1 to 4 and FIG. 5, a lifting / lowering device 51 of a separating member which is detachably attached to an air conditioner main body 50 according to the present embodiment is obtained from an AC power supply Ein. Pulse converting means 60 (see FIG. 3) for converting the input sine wave input signal into a pulse signal composed of a number of pulse trains;
A pulse counting means 70 for measuring the number of pulse trains of the pulse signal generated by the pulse converting means 60, and a forward / reverse rotatable AC synchronous motor (hereinafter, referred to as "rotating") which rotates by the same number of steps as the number of applied AC voltage waves. 2, which is rotatably provided via a bearing (not shown) fixed in a housing provided on the ceiling of a building such as a building, and is rotatably driven by the motor 80. Two axes 90, 91 and two axes 90,
The two drums 100a, 10
0b and 101a, 101b.

In the case of this embodiment, the air conditioner body 50
Is a grill G that detachably holds a filter of the air conditioner.

Two drums 100a, 100b and 1
One end of the first wire 110 and one end of the second wire 120 are fixed to each of the wires 01a and 101b, and are wound so as to be able to be wound up / out (see FIG. 1).

In the present embodiment, as shown in FIG. 1, first wire 110 and second wire 1
The other end of 20 is connected to each other by a connecting means such as a hook via a pulley 130 which is a suspension provided on grill G. Thus, the first wire 110 and the second wire 110
Is stretched so as to hang down in a U-shape with the wire 120,
It is preferable that the grill G be suspended from the first wire 110 and the second wire 120 via the pulley 130, since a rotating mechanism for rotating the drum is not required. Note that a hook may be used instead of the pulley as the suspension portion.

The grill G is connected to the first wire 110 and the second wire 110.
In the case of fixing directly to the tip of the wire 120, a rotating mechanism of the drum for absorbing the difference in the length of each wire is necessary, but it is only a matter of design change for those skilled in the art, and this embodiment included. The method of stretching a wire as shown in FIGS. 6 and 7 is also included in the present invention.

In the case of the present embodiment, the driving section D
Although two motors 80 are provided (see FIG. 2), driving two shafts 90, 91 by one motor 80 is only a matter of design change for those skilled in the art.
Included in this embodiment.

Next, the operation of the pulse conversion means 60 of the present embodiment will be described with reference to FIGS.

The sine wave input signal Ein is supplied to the transformer T, and the potential at the point a is higher than the potential at the point b by half.
When in the cycle, the transformer secondary voltage is equal to the DC voltage E
Until the voltage exceeds 1, the base current of the transistor Tr does not flow, the transistor Tr is “OFF”, and the output voltage E
out is a positive voltage.

When the secondary voltage of the transformer exceeds the DC voltage E1, a current (base current) is applied to a circuit including the diode D3, the resistor R1, the transistor Tr (base and emitter), and the diode D2. Flow, the transistor Tr becomes “ON”. The output voltage Eout becomes zero.

When the secondary voltage of the transformer falls below the DC voltage E1, the same operation as described above is performed, and the output voltage Eout becomes a positive voltage.

The sine wave input signal Ein is supplied to the transformer T, and the potential at the point a is lower than the potential at the point b by half.
When in the cycle, the transformer secondary voltage is equal to the DC voltage E
Until the voltage exceeds 1, the base current of the transistor Tr does not flow, the transistor Tr is “OFF”, and the output voltage E
out is a positive voltage.

When the secondary voltage of the transformer exceeds the DC voltage E1, a current (base current) is applied to a circuit including the diode D4, the resistor R1, the transistor Tr (base and emitter), and the diode D1. As a result, the transistor Tr is turned “ON” and the output voltage Eout becomes zero.

When the secondary voltage of the transformer falls below the DC voltage E1, the same operation as described above is performed, and the output voltage Eout becomes a positive voltage.

As described above, the operations (1) to (4) are periodically repeated, so that the sine wave input signal (see the uppermost stage in FIG. 4) is converted into a pulse signal composed of a large number of pulse trains (see the middle stage in FIG. 4). .

The pulse width can be changed by changing the DC voltage E1. For example, the pulse width is changed from the pulse width shown in the middle part of FIG. 4 (referred to as the DC voltage E1a at this time) to the lowermost part in FIG. When changing the pulse width to the indicated pulse width, the DC voltage E1b at this time may be set to satisfy E1b> E1a.

The pulse counting means 70 for measuring the number of pulse trains of the pulse signal generated by the pulse converting means 60 is a cascade-connected counter integrated circuit (IC) indicated by reference numeral 70a in FIG. Is adopted.

According to such a counter means 70, when the set number of pulses is reached, a signal is output and the motor 80
To stop. At this time, by simultaneously inputting the CLEAR signal, the counter integrated circuit 70a is reset.

If synchronization is required for each stage of the counter integrated circuit 70a, a carry-forward circuit may be added.

In the case of this embodiment, a so-called synchronous motor is employed as the AC synchronous motor. As the synchronous motor, for example, an inductor type of Japan Servo Corporation can be adopted. Such a synchronous motor is preferable because the rotation speed of the motor rotates in synchronization with the power supply frequency, so that a constant rotation speed can be maintained even if the magnitude of the voltage or load slightly changes.

According to the present embodiment, when a switch (not shown) is set to the lower side, the motor 80 rotates to draw out the wire wound around the drum, and the grill G is lowered. At the same time, the AC voltage applied to the motor 80 is converted into a pulse train by the pulse converting means 60, and the number of generated pulse trains is measured by the pulse counting means 70. When the pulse sequence reaches a predetermined value, the pulse counting means 70 generates a stop signal, and the control circuit CLR stops outputting to the motor 80 and the pulse conversion means 60. Therefore,
The grill G can be stopped at a predetermined lowered position.

On the other hand, when the switch is set to the up position, the motor 80 rotates in the reverse direction, the drum winds up the wire, and the grill rises. At the same time, the AC voltage applied to the motor 80 is converted into a pulse train by the pulse converting means 60, and the number of occurrences of the pulse train is measured by the pulse counting means 70. When the pulse sequence reaches a predetermined value, the pulse counting means 70 generates a stop signal, and the control circuit CLR stops outputting to the motor 80 and the pulse conversion means 60. When raising the grill, a limit switch may be provided on the grill or the air conditioner main body 50, and the motor 80 may be stopped.

[0044]

According to the elevating device of the present invention, it is possible to provide an elevating device capable of performing high-precision elevating control at a low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an example of an elevating device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an outline of a driving unit of the lifting device of FIG.

FIG. 3 is a circuit diagram showing an example of a pulse conversion means used in the lifting device according to the present invention.

FIG. 4 is a graph showing pulses generated by the pulse conversion means of FIG.

FIG. 5 is a circuit diagram showing an example of a pulse counting means used in the lifting device according to the present invention.

FIG. 6 is an explanatory diagram showing an example of a method of stretching a wire used in the lifting device according to the present invention.

FIG. 7 is an explanatory diagram showing an example of a method of extending a wire used in the lifting device according to the present invention.

FIG. 8 is a block diagram showing an example of a conventional elevating device.

FIG. 9 is a block diagram showing one example of a rotation angle signal generating means constituting rotation control of a conventional electric motor.

FIG. 10 is a circuit diagram showing an example of a rotation drive unit that constitutes a conventional rotation control of an electric motor.

FIG. 11 is a graph showing input and output of rotation control of the electric motor of FIGS. 9 and 10;

[Explanation of symbols]

 Reference Signs List 50 Air conditioner main body 51 Lifting device 60 Pulse conversion means 70 Pulse counting means 80 AC pulse motor 90 Axis 100a, 100b Drum 110, 120 Wire 130 Pulley

Claims (8)

[Claims] An apparatus for raising and lowering a separation member detachably attached to an air conditioner main body provided on a ceiling of a building, wherein a sine wave input signal obtained from an AC power supply is converted from a large number of pulse trains. Pulse converting means for converting the pulse signal into a pulse signal, pulse counting means for measuring the number of pulse trains of the pulse signal generated by the pulse converting means, and the same number of steps as the number of pulse trains to which the pulse signal is added An AC synchronous motor capable of rotating only forward and reverse, a drum provided in the air conditioner, driven by the AC synchronous motor, and a wire stretched by the drum so as to be able to be wound up / out. An elevating device, wherein the separating member is provided with a suspension portion detachably engaged with the wire. 2. The elevating device according to claim 1, wherein the wire is stretched so as to hang down in a U-shape, provided with two suspension portions, and one end of the wire is fixed to a drum. 3. The apparatus according to claim 2, wherein the wire is stretched so as to hang down in a U-shape, the wire further includes a second drum, and the second drum is rotatably driven by the AC synchronous motor. The lifting device according to claim 1, wherein the lifting device is fixed to the second drum. 4. A second drum, wherein the wire hangs down in a vertical direction and includes two suspension portions, and is fixed to a second drum rotatably driven by the AC synchronous motor so as to be wound / unwound to the second drum. And a second wire provided so as to hang in a vertical direction, wherein free ends of the wire and the second wire are connected to the two suspension portions, respectively. The lifting device as described. 5. A second AC synchronous motor identical to the AC synchronous motor, wherein the wire is stretched so as to hang down in a U-shape, and a third drum driven to rotate by the second AC synchronous motor. And a second wire having one end fixed to the third drum and the other end fixed to the air conditioner main body, four suspension units, and four suspension units. 2. The lift according to claim 1, wherein two of the four suspensions are detachably engaged with the wire, and the other two of the four suspensions are detachably engaged with the second wire. apparatus. 6. A second AC synchronous motor identical to the AC synchronous motor, one end of which is fixed to a drum by the second AC synchronous motor, the wire being stretched so as to hang down in a U-shape. A second wire fixed at an end to a fourth drum and extending in a U-shape, the second wire being provided with four of the suspensions, and two of the four suspensions being provided;
The lifting device according to claim 1, wherein one of the four suspension portions is detachably engaged with the wire, and the other two of the four suspension portions are detachably engaged with the second wire. 7. The wire is stretched so as to hang down in a U-shape and includes four hanging portions, two of the four hanging portions are detachably engaged with the wire, and the four hanging portions are attached to the wire. The other two of the suspensions are removably engaged with the second wire, the air conditioner body is provided with at least one pulley, and the wire is engaged with the four suspensions and the pulley. The lifting device according to claim 1, wherein 8. The method according to claim 1, wherein the suspension is a pulley.
The lifting device according to 2, 3, 4, 5, 6, or 7.