JPS6233250A - Control unit of air conditioning door - Google Patents

Abstract

PURPOSE:To improve the sealing property of the door when it is closed and the space cooling and heating efficiency by constituting the control unit so that a motor for driving the door is locked for a short period of time when the air conditioning door is closed. CONSTITUTION:When normally driving terminals 12a and 13a are selected in a state where an air mix door 1 is in an intermediate position, a motor 5 is normally driven, and the air mix door 1 is driven toward a full heat side (a). Simultaneously, a slide contact 9 is moved toward the full heat side (a). When the air mix door 1 reaches the full heat side (a), the slide contact 9 slips out of a conductive track 8b, and excitation with respect to a delay relay 20 is released. However, a constantly open contact 20a of a delay relay 20 is not immediately opened but is delayed for a short period of time. During this delay time, power supply to the motor 5 continues, the motor is driven into a locked state, and the air mix door 1 assumes a hermetically closed state at the full heat side (a). If reversing terminals 12c and 13c are selected in this state, the air mix door 1 assumes a hermetically closed state at the full cool side (b) after a similar operation process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a motor-driven air conditioning door such as an air mix door.

[Description of Prior Art] FIG. 4 is a block diagram showing a conventional example of this type of control device.

Reference numeral 1 denotes an air mix door, which, as is well known, is placed in the duct 4 between the evaporator 2 and the heater core 3, and when operated to the full heat side a, all the air supplied via the evaporator 2 is delivered to the heater core. All the air is sent to heater core 3 and operated by the full cool side.
is sent downstream without being given to Such an air mix door 1 is driven by a motor 5 via a link mechanism, and the operating angle θ between the full heat side a and the full cool side is connected to the motor 5 via a forward/reverse circuit 6. This is regulated by a stop circuit 7. The stop circuit 7 includes a conductive pattern 8 and a sliding contact 9 that slides on the conductive pattern 8 in conjunction with the rotation of the motor 5. The conductive pattern 8 has a common conductive track 8a connected to the power supply and the full heat side a of the air mix door 1.
The conductive track 8b regulates the stop position at the full cool side of the air mix door 1, and the conductive track 8C regulates the stop position at the full cool side of the air mix door 1. The forward/reverse rotation circuit 6 includes interlocking changeover switches 10.11 inserted into the energizing circuit of the motor 5, and selection terminals 12a to 12c and 13a to 13c are provided for each of these changeover switches. Terminals 12a and 13a are normal rotation terminals, terminal 12a is connected to conductive track 8b, and terminal 13a is grounded. When the changeover switch 10.11 selects these terminals 12a and 13a, the air mix door 1 is driven toward the full heat side a via the motor 5, and at the same time the sliding contact 9 is moved to the full heat side a. will be carried out. and.

When the sliding contact 9 comes off the conductive track 8b, the power to the motor 5 is cut off, and the air mix door 1 is operated to the full heat side a. Terminals 12c and 13c are inverted terminals, terminal 12c is grounded, and terminal 13c is connected to conductive track 8C. Changeover switch 10.11
By selecting these terminals 12c and 13c, the air mix door 1 is driven toward the full cool side via the motor 5, and at the same time, the sliding contact 9 is moved to the full cool side. . Then, as the sliding contact 9 comes off the conductive track 8C, the motor 5 is cut off.
The air mix door 1 is operated to the full cool side. Terminals 12b and 13b are off terminals, and selector switch 10.1
By selecting these terminals, the air mix door 1 is stopped at an arbitrary opening degree within the range of the operating angle θ.

In the prior art with such a configuration, when the air mix door l is operated to the full heat side a or the full cool side and the electric current to the motor 5 is cut off by the movement of the sliding contact 9, the air mix door 1 is always turned off. There is no problem if the airtight condition is achieved. However, due to variations in component accuracy or variations in the mounting position of the link mechanism between the air mix door 1 and the motor 5, the airtight condition may not always be achieved. Similarly, there is a risk that a non-sealing state may occur due to wear of the component parts, and as a result, there is a problem in that the sheeting properties of the air mix door become defective and the cooling or heating efficiency decreases.

[Purpose of the invention] The present invention has been made based on the above viewpoint.

The purpose is to provide an air conditioning door control device that can always provide good sheeting properties.

[Means for achieving the object] In the present invention, in a control device that controls energization of a motor that drives an air conditioning door provided in a ventilation system of an air conditioner, the air conditioning door is switched to a closed position. and a means for turning off the power to the motor after a short time elapses after the detection, and the drive motor is forced into a locked state for a short time when the air conditioning door is opened, thereby achieving the above object. Achieve.

[Embodiment of the Invention] FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals as in FIG. 4 indicate the same components.

The feature of this example is that delay relays 20 and 21 are provided between the forward rotation/reverse rotation circuit 6 and the stop circuit 7, and detect that the air mix door 1 has been switched to the closed position via the stop circuit 7. The reason is that the power supply to the motor 5 is turned off after a short time has elapsed after this detection. The delay relays 20, 21 are mechanically configured to delay their response by a predetermined time, and both have normally open contacts 20a, 21a.

The normally open contact 20a of the delay relay 20 is inserted and connected between the selection terminal 12a of the forward/reverse rotation circuit 6 and the power supply, and the relay coil 20b is inserted and connected between the conductive track 8b of the stop circuit 7 and the ground. has been done. The normally open contact 21a of the other delay relay 21 is inserted and connected between the selection terminal 13c of the forward/reverse circuit 6 and the power supply, and the relay coil 21b is connected between the conductive track 8C of the stop circuit 7 and the ground. Insertion is connected. For other configurations, please refer to Chapter. It is the same as Figure 4.

With this configuration, if the air mix door 1 is in the intermediate position as shown in the figure, the sliding contact 9 of the stop circuit 7 is also in the intermediate position, so the delay relays 20 and 21 are both in the energized state, and the follower Those normally open contacts 20a, 21a
is kept closed. In this state, if the normal rotation terminals 12a and 13a are selected in the forward/reverse rotation circuit 6, the motor 5 is driven to rotate in the forward direction, and thereby the air mix door 1 is driven toward the full heat side a. At the same time, one sliding contact 9 is moved toward the full heat side a. When the air mix door 1 reaches the full heat side a, the sliding contact 9 is removed from the conductive track 8b, so that the delay relay 20 is de-energized. However, since the normally open contact 20a of the delay relay 20 does not open immediately but is delayed for a short time, the motor 5 continues to be energized during this delay time. As a result, the motor 5 is forced into a locked state, and the air mix door l is inevitably opened to the left on the full heat side a. In this state, if the reverse rotation terminals 12c and 13c are selected in the forward/reverse rotation circuit 6, the normally open contact 21a of the delay relay 21 is closed because the delay relay 21 is in the energized state, and therefore the motor 5 is driven in the reverse direction. Air mix door 1 and sliding contact 9 are driven toward full cool 01lb. Then, the air mink store 1 reaches the fully cooled side, and the sliding contact 9 is connected to the
[When removed from the trunk 8c, the motor 5 is forced into a locked state due to the delay caused by the delay relay 21, and the air mix door (2) inevitably becomes in a sealed state on the full cool side. In this state, since the delay relay 20 is in an excited state, driving to the full heat side a is possible by switching to the normal rotation terminals 12a and 13a.

FIG. 2 is a block diagram showing another embodiment of the undeveloped town, and the same reference numerals as in FIG. 1 indicate the same parts.

In the figure, 30 is a conductor pattern that regulates the stop position of the air mix door l on the full heat side a, 31 is a sliding contact that slides on the conductor pattern 30 in conjunction with the rotation of the motor 5, and 32 is a conductor pattern for the air mix door l. A conductive pattern 33 is a sliding contact that slides on the conductive pattern 32 in conjunction with the rotation of the motor 5. The conductor patterns 30 and 31 each have two conductive tracks 30a, 30b and 31a, 31.
b, each of which is electrically independent. Conductive tracks 30a and 32a correspond to conductive track 8a of FIG. 1, conductive track 30b corresponds to conductive rack 8b of FIG. 1, and conductive track 32b corresponds to conductive track 8C of FIG. ing. The sliding contacts 31 and 33 are electrically independent from each other, and their moving direction and amount are the same.

The conductive track 30a of the conductive pattern 30 regulating the full heat side a is connected to a power source through a series connection of detection resistors 34a and 34b, and the conductive track 30b is grounded. A connection point between the detection resistors 34a and 34b is connected to the (+) input terminal of the comparator 35,
This causes the (+) input terminal of the comparator 35 to
If the sliding contact 31 moves to the full heat side a and comes off the conductive track 30b, 1 is applied via the resistor 34a; if the original voltage is applied and the sliding contact 31 has not reached the full heat side a, the resistors 34a and 34b A lower divided voltage can be changed depending on the voltage. Comparator 35
A reference voltage is applied to the (-) input terminal of , through series resistors 36a and 36b inserted between the power supply and ground. This reference voltage is smaller than the voltage applied to the (+) input terminal when the sliding contact 31 comes off the conductive track 30b on the full heat side a, and the sliding contact 31 is on the conductive track 30b.
It is set to be larger than the partial voltage given when it is in electrical contact with 0b, and the sliding contact 31 is on the full heat side a.
When the conductive track 30b is removed, the output of the comparator 35 is inverted to H level.

The output terminal of the comparator 35 is connected to one end of a resistor 38 via a resistor 37 inserted between the comparator 35 and ground. The other end of this resistor 38 is connected to the base of a transistor 40 via a Mu capacitor 39 inserted between the resistor 38 and the ground. The collector emitter circuit of the transistor 40 is inserted between the relay coil 41a of the relay 41, one end of which is grounded, and the power supply. The contact 41b of the relay 41 is a normally closed contact, and the negative end is connected to the power supply, and the other end is connected to the selection terminal 12a of the forward/reverse rotation circuit 6, respectively.

Regarding the conductor pattern 32 that regulates the fully cooled sideboard, except for the connection between the normally closed contact 49b of the final stage relay 49 and the forward/reverse circuit 6, there are no detection resistors 42a, 42b, a comparator 43, and a reference resistor 44a. , 44b, resistor 45
．． 46. A delay capacitor 47, a transistor 48, and a relay 49 constitute the same circuit as described above. A normally closed contact 49b of the relay 49 is inserted and connected between the power source and the selection terminal 13c of the forward/reverse rotation circuit 6.

With the above configuration, when the air mix door 1 is located between the full heat side a and the full cool side, the sliding contact 31
is in a state of electrical continuity between the conductive tracks 30a and 30b, and therefore the (+) of the comparator 35
) A divided voltage lower than the reference voltage is applied to the input terminal, and the output of the comparator 35 is at L level. Therefore, the transistor 40 is in an off state, and the normally closed contact 41b of the relay 41 is closed. Similarly, the other sliding contact 33 is in a state where conduction is established between the conductive tracks 32a and 32b.

The output of comparator 43 is at L level, and relay 49
The normally closed contact 49b is closed.

In this state, the normal rotation terminal 1 in the normal rotation/reverse rotation circuit 6
2a and 13a are selected, power supply voltage is applied to the motor 5 via the normally closed contact 41b of the relay 41, and the forward rotation of the motor 5 drives the air mix door l toward the full heat side a. , the sliding contacts 31, 33 are moved to the full heat side a. When the air mix door 1 reaches the full heat side a, the sliding contact 31 is removed from the conductive track 30b, so a voltage higher than the reference voltage is applied to the (+) input terminal of the comparator 35, which causes the output of the comparator 35 to changes to H level. However, since the capacitor 39 is present, the transistor 40 does not turn on immediately, but the turning on state is delayed until the capacitor 39 is completely charged. As a result, the motor 5 is not energized during this delay time! I, the motor 5 is forced into a locked state, and the air mix door I is inevitably in a sealed state on the full heat side a.

On the other hand, even if the sliding contact 31 comes off the conductive track 30b, the other sliding contact 33 maintains continuity between the conductive tracks 32a and 32b, so that the reverse rotation terminals 12c and 13c are selected in the forward/reverse rotation circuit 6. As a result, the motor 5 is energized in the opposite direction through the normally closed contact 49b of the relay 49 in the closed state, and the motor 5 is rotated in the reverse direction. As a result, the air mix door I is driven toward the full cool side, and the sliding contacts 31 and 33 are moved to the full cool side. Due to this movement, the sliding contact 31
restores continuity between conductive tracks 30a and 30b, so the output of comparator 35 goes low and capacitor 39 discharges through resistor 38.37, allowing the next delay operation. When the air mix door 1 reaches the full cool side, the sliding J shaft 33 disengages from the four-light track 32b, the output of the comparator 43 becomes H level, and the motor 5 is locked due to the presence of the capacitor 47, as described above. Therefore, the air mix door 1 is inevitably in a sealed state on the full cool side. In this state, since the sliding contact 31 is in a conductive state between the conductive tracks 30a and 30b, driving to the full heat side a is possible by switching to the normal rotation terminals 12a and 13a.

FIG. 3 is a configuration diagram showing still another embodiment of the present invention, and FIG.
Items with the same reference numerals as those in the figures indicate the same items.

The characteristic # of this example is that the limit switches 50 and 51ffi are configured to detect that the air mix door 1 has reached the full heat side a or the full cool side. The limit switch 50 detects that the air mix door l is driven to the full heat side a, and has a normally closed contact 50a. The limit switch 51 detects that the air mix door 1 is driven to the full cool side, and has a normally closed contact 51 ai. When the air mix door 1 is between the full heat side a and the full cool side, the contacts 50a of the rim switches 50 and 51
, 51a are both in the open state, and are opened when the air mink store 1 reaches the full heat side a or the full cool side. Therefore, the air mix door 1 is in the sealed state by the same operation as in the case of FIG. achieved.

It goes without saying that the embodiments described above can also be applied to control of other air conditioning doors, such as the air mix door.

[Effects of the Invention] As explained above, according to the present invention, since the motor for driving the air conditioning door is forced into a locked state for a short time when the door is closed, the sheeting property when the air conditioning door is closed is improved. In addition, even if there are variations in the accuracy of parts or variations in the mounting position of the link mechanism, it is possible to eliminate these effects and seal the air conditioning door, improving cooling and heating efficiency. It is possible to provide a control device for an air conditioning door that is further improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, FIG. 3 is a block diagram showing yet another embodiment of the present invention, and FIG. The figure is a configuration diagram showing a conventional example of a control device for an air conditioning door. 1...Air mix door 5...Motor 6...
Forward/reverse circuit 8.30.32...Conductor pattern
9, 31. 33...Sliding contacts 20, 21--Delay relay 34a, 34b, 42a, 42b--Detection resistor 36a.

Claims (1)

[Claims] In a control device for controlling energization of a motor that drives an air conditioning door provided in a ventilation system of an air conditioner, there is provided a means for detecting that the air conditioning door has been switched to a closed position, and a means for detecting that the air conditioning door has been switched to a closed position, and a means for detecting that the air conditioning door has been switched to a closed position; 1. A control device for an air conditioning door, comprising means for turning off power to the motor, and configured to force the drive motor into a locked state for a short time when the air conditioning door is closed.