JPS6359355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dryer suitable for drying a mixture of quick-drying clothing and non-quick-drying clothing.

Figure 6 shows the drying rate D and drying time T of various fabric types.
In the figure, curve X shows the relationship between synthetic fibers and
Curve Y represents cotton, and curve Z represents flannel. As shown in this figure, when clothes with different drying speeds are mixed and put into the rotating drum of a dryer and drying is performed, quick-drying clothes such as synthetic fibers have a drying rate of about 100% compared to cotton's drying rate of about 80%. , and after that the drying operation becomes wasteful for quick-drying clothes.

The present invention was made in view of such circumstances, and its purpose is to change the drying rate set value of the comparison circuit for determining the drying rate from the first set value corresponding to a low drying rate during the drying process. By providing a means to automatically change to a second set value corresponding to a high drying rate and having a configuration that notifies the change, it is possible to notify when non-quick drying clothing reaches, for example, 80% drying rate. , a dryer that can be expected to have effects such as being able to encourage the user to take out quick-drying clothes from the rotating drum when they know that the drying rate has reached approximately 100%, and contributing to overall energy savings. is to provide.

The present invention will be explained below by way of an embodiment with reference to the drawings. In FIG. 1, 1 is an instantaneous value detection circuit, 2 is an instantaneous value storage circuit, 3 is a comparison circuit, 4 is a control section, and 5 is a set value automatic changing means. Furthermore, in these specific configurations, 6 is an AC power supply, and 7 is a transformer energized by the AC power supply 6, which provides DC power between DC buses 10 and 11 via a full-wave rectifier circuit 8 and a smoothing circuit 9. It's getting old.
12 is a timer including a timer motor 13 and cam switches 14 to 20. This timer 1
The operating parts of 2 are shown in FIG. 2, and the opening and closing timings of the cam switches 14 to 20 are shown by diagonal lines in FIG. In FIG. 2, reference numeral 21 denotes an operation knob of the timer 12, and 21a denotes a setting instruction section for instructing settings of the operation knob 21. Shown in Figure 3
A ₀ , A ₁ ... and B ₀ , B ₁ ... are the cam switch 14
These symbols indicate switching positions of cams that open and close 20 to 20, and some of them are also shown in FIG. 2 for convenience. As understood from FIGS. 2 and 3, this timer 12 has an automatic setting area TA whose timing area is between positions A ₀ and B 0, and a cut position OFF and a timing area between positions A 0 and B ₀ .
Manual setting area with timing area between B ₀
Has TB. Now, 22 is a drive motor that drives the rotating drum and the fan, which is controlled by the cam switch 15, and 23 is a heater that is a heat source of hot air that is supplied to the rotating drum, and is controlled by the cam switch 14. The timer 12 is energized by cam switches 16 and 17, and is also energized by a normally open contact 25 of a relay 24, independent of the cam switch 17. In the instantaneous value detection circuit 1, 26 and 27 are a pair of electrodes, one of which is connected to the DC bus 10 via a resistor 28,
The other electrode 27 is grounded via resistors 29 and 30. Here, the value of resistance 30 is approximately 75% to 85% drying rate.
%, which is approximately equal to the cloth resistance between the electrodes 26 and 27 during the middle stage of drying, that is, during "half-dry removal". The detection terminal 31, which is the non-grounded end of the resistor 30, is connected to the input resistor 3 in the instantaneous value storage circuit 2.
2a, is grounded via an operational amplifier 32, a diode 33, and a storage capacitor 34. The instantaneous value output terminal 35, which is the non-grounded end of the storage capacitor 34, is connected to one input end of the comparator 36 in the comparison circuit 3, and the DC bus 10 is connected in series between the other input end and the ground point. Resistor 3 installed in
Terminal voltage V _R of resistor 39 among 7, 38, and 39
is now given as the drying rate setting value. In the explanation so far, the detection terminal 31 in the instantaneous value detection circuit 1 has the electrodes 26 and 2.
When a voltage V _S (detected instantaneous value) as shown in FIG. 4 appears which is inversely proportional to the instantaneous resistance value of the cloth between 7 and 7, and the terminal voltage of the memory capacitor 34 is V _C (see FIG. 4), The operational amplifier 32 is (V _S > V _C )
It is turned on when the memory capacitor 34
is instantly charged by V _S. The reason why this instantaneous charging is possible is that the gain of the operational amplifier 32 is extremely high. The terminal voltage V _C of the memory capacitor 34 is then used as the drying rate signal by the operational amplifier 3.
It is designed to be applied to one input terminal of 2. On the other hand, the comparator 36 outputs a high level voltage V _D when (V _C < V _R ) (see Figures 4 and 5).
is output as a set value arrival signal, and this is connected to the resistor 40.
Transistor 41 receives electricity through relay 24 . 42 is a changeover switch having contacts 42a to 42d;
42b, transistor 45 is turned on by a network consisting of diode 43 and resistors 44a, 44b, and diode 46 is turned on.
DC bus 1 is connected to the common point of resistors 37 and 38 through
It is designed to give a potential of 0. Further, contacts 42a-42b are turned on, and contacts 42a-42 are turned on.
When the potential of the DC bus 10 is set to be on between the conductor 4 and the contact 42a to 42d,
7 from the contact 42b through a series circuit of the diode 48 and the cam switch 18, and from the contact 42c only through the cam switch 19, and from the contact 42c.
2d through a diode 49 and a cam switch 19, respectively. Conductor 47
voltage dividing resistors 50a and 50b are interposed in series,
When the potential of the DC bus 10 is applied to the conducting wire 47, the transistor 41 is forcibly turned on. On the other hand, a series circuit of a transistor 45 and a resistor 51 and a resistor 52 are connected in parallel with the memory capacitor 34 in the instantaneous value memory circuit 2. Here, the transistor 45 is for switching the storage time, that is, switching the discharge time constant of the storage capacitor 34.
The values of the resistors 51 and 52 are set so that the discharge time constant when is off is _Tc , and when it is on is _Td (Tc=10Td). On the other hand, V _R when the contacts 42a and 42b of the changeover switch 42 are on is set as V _R1 , and that when the contacts 42a and 42b are off is V R1.
Assuming V _R2 , resistor 3 so that (V _R1 = 10V _R2 )
Values of 7, 38, and 39 are determined. in this case,
V _R1 is the first set value corresponding to low drying rate,
Further, V _R2 becomes the second setting value corresponding to a high drying rate. Next, to describe the automatic setting value changing means 5 for taking out mixed clothes in the middle, 53 is connected in series between the DC bus 10 and the ground point through the normally closed contact 55 of the relay 54 and the relay 56. thyristor, and the timer 1 is connected to its gate.
The contact 4 of the changeover switch 42 is
The ignition signal is given from 2d. Two normally open contacts 59 and 60 of the relay 56
One of the normally open contacts 59 is the changeover switch 42
The other normally open contact 60 supplies power to another comparator 61 of the comparator circuit 3 when turned on. One input terminal of this comparator 61 is connected to the terminal voltage of the storage capacitor 34.
V _C is applied thereto, and a set value is applied to the other input terminal from a voltage dividing circuit consisting of resistors 62a and 62b. This set value is set to a value substantially equal to the first set value V _R1 (low drying rate). And the output of the comparator 61 is the resistor 63
and the transistor 65 via the delayed recovery circuit 64.
The relay 54 is energized by the transistor 65. Reference numeral 66 denotes a notification device, for example, a first buzzer, which is connected to be supplied with power from the AC power source 6 via a bimetal switch 67 and its indirect heater 68;
A normally closed contact 69 of the relay 54 is connected in parallel to the series circuit of the buzzer 66 and bimetal switch 67. A second buzzer 70 has a different tone from the first buzzer 66, and is connected in parallel with the cam switch 15 via a bimetal switch 71, and an indirect heater 72 of the bimetal switch 71 is connected in parallel with the drive motor 22. It is connected. Reference numeral 73 denotes a door switch that operates in conjunction with a door that opens and closes a clothing entrance leading into the rotating drum.

Next, the operation of the above configuration will be explained separately for each state.

(a) "Dry removal" operation This operation is an operation in which clothes are removed for ironing etc. at a drying rate of approximately 80%, and in this case, the selector switch 42 is set to ON between contacts 42a and 42b. . As a result, the transistor 45 turns on, so the discharge time constant of the storage capacitor 34 is set to a short value of Td, while V _R is set to a high value of V _R1 (see Figure 4), that is, approximately 80% drying rate. is set to the first setting value corresponding to . In this state, the operation knob 21 of the timer 12 is set at position A6 in the automatic setting area TA. Then cam switch 14,1
5, 16, 18, 19, and 20 are in the closed state.
As a result, the drive motor 22 and heater 23 are energized to start drying operation, but at this time, the cam switch 18 is closed and the transistor 41 is forcibly turned on, so the relay 24
The normally open contact 25 is turned on and the timer motor 13 is forcibly energized. Therefore, the timer 12 continuously advances to position A4, where the cam switch 18 is opened, regardless of the cam switch 17, and stops there. on the other hand,
During this time and thereafter, the clothes in the rotating drum repeatedly come into contact with the electrodes 26 and 27.
V _S and V _C change as shown in Figure 4. Fourth
As shown in the figure, all the instantaneous values of V _S appearing at the detection terminal 31 are equal to or higher than V _R1 at the beginning of drying, such as during the time period (t ₀ - t ₂ ), but as the drying progresses,
The number of items with V _R1 or lower gradually increases. However, as is clear from FIG. 4, even if there is a case where V _S is less than V _R1 , the storage capacitor 34 immediately after being charged by V _S will have a V _S higher than V _R1 .
is detected as the drying rate signal V _C for a certain period of time (Td
Therefore, even if V _S which is less than V _R1 occurs, V _C will maintain V _R1 or more for a certain period of time. This clearly means low drying rate preferential memory. Now, if the state of (V _C < V _R1 ) is formed even once as it progresses to the middle dry period shown by the time period (t ₄ - t ₁₀ ),
Each time, a high level voltage V _D is output from the comparator 36 (see FIG. 4), and thereafter the automatic stop control process is started. That is, when voltage V _D is output,
Each time the relay 24 is energized, the timer motor 13 and hence the timer 12 are intermittently advanced from the stop position A4 to the position A3. The time between these positions A4 and A3 is set to be extremely short, for example, one minute. When the timer 12 reaches position A3, the cam switch 17 is closed, so the timer motor 13 is switched to continuous energization by the cam switches 16 and 17, and the timer 12 starts to run continuously. On the other hand, when the position A3 is reached, the heater 23 is cut off by the cam switch 14 and the cold air operation is started.At the same time, the drive motor 22 is cut off by the cam switch 15 at the subsequent position A2, and the drying operation is started with a drying rate of about 80%. stopped in the state.

In other words, the instantaneous resistance of the cloth part with the lowest drying rate among the cloth parts with various drying rates.
V _C is stored and compared with the drying rate set value _VR , and the minimum drying rate set value attainment signal V _D obtained each time the set value is reached is integrated by the timer 12 with its time width and number of occurrences ( (accumulation between positions A4 and A3), and when this reaches a set integration value (reaching position A3), the drying operation is stopped.

According to this configuration, even if the frequency of contact between the electrodes 2, 6, and 27 and clothing changes due to a difference in the amount of cloth, the detected instantaneous value and the set integrated value do not change, so the set drying rate and the actual drying The degree of agreement with the rate is higher.
Incidentally, when the cam switch 15 is opened as described above, the second buzzer 70 sounds to report the end of the operation. At this time, since the impedance of the second buzzer 70 is high, the amount of heat generated by the indirect heater 72 decreases, and after a certain period of time, the bimetal switch 71 is turned off and the second buzzer 70 stops sounding.

(b) Operation in "normal dry" state In this case, changeover switch 42 should be set to contact 42a-
Set to on for 42c. As a result, the transistor 45 turns off contrary to the above, so the discharge time constant of the storage capacitor 34 is set to a long value T _C , while V _R is as low as V _R2 as shown in FIG. value (second set value corresponding to high drying rate). This "normal drying" is approximately 100% of the normal cloth quality.
It is intended to obtain a drying rate close to
1 at position A6 in the automatic setting area TA.
This setting allows timer 12 to switch to cam switch 1.
9, it is forcibly advanced to position A5. After the time period t ₁₁ , which is past the "80% drying rate" time period during the process of increasing the drying rate (see enlarged view in Figure 5)
corresponds to "normal drying", and during this time period t ₁₁
After that, especially in the final stage of drying, even if most of the cloth parts are at or above the set drying rate, only a small portion of the clothing, such as the cuffs, is below the set drying rate. Therefore, the cycle in which (V _C < V _R2 ) becomes extremely long, but since the discharge time constant of the memory capacitor 34 is set to Tc, which is longer than Td, by the changeover switch 42, it is difficult to dry out. The priority of detecting the drying rate of the cloth portion is further increased. Moreover timer 12
In this case, the cumulative time of the set value arrival signal V _D regarding the drying rate (the time during which the cam switches 17 and 19 are both turned off and the timer motor 13 is intermittently energized only by the normally open contact 25) is set to be long between positions A5 and A3 ( (equivalent to increasing the set integrated value), it is possible to completely dry even the parts of the fabric that are difficult to dry.

(c) "Mixed clothing midway removal" operation This operation is intended to allow quick-drying clothing that has reached a drying rate of approximately 100% to be taken out midway through the drying process, and is intended to be used for synthetic fibers with the characteristics shown in Figure 6. An example will be explained in which drying operation is performed with clothing and cotton clothing coexisting in a rotating drum.

In this case, changeover switch 42 is connected to contact 42a-4.
Set it on for 2d and turn the operation knob 21 to position A6.
Set nearby. Then cam switch 14,1
5, 16, 18, 19, 20 are turned on, so
As mentioned above, the drive motor 22 and heater 23 are energized to start the drying operation, and the timer 12 is unconditionally advanced to position A5 by the cam switch 19, while the cam switch 20 is turned on for a short time. Then, the thyristor 53 is turned on and the relay 56 operates, and its normally open contacts 59 and 60
Turn on. When the normally open contact 59 is turned on, firstly, the transistor 45 is turned on, and the discharge time constant of the storage capacitor 34 is set to Td, which is a short time.
Further, V _R given to one comparator 36 is set to a first set value V _R1 corresponding to 80% drying rate, and secondly, the other comparator 61 is turned on by turning on the normally open contact 60. is given and becomes operational. On the other hand, with the start of the drying operation, the memory capacitor 34
As mentioned above, the drying rate signal is detected with priority given to low drying rate.
Since V _C is output, the comparator 61 compares V _C corresponding to the drying rate of slow-drying cotton clothing with V _R1 , and when the drying rate of cotton clothing reaches approximately 80%, V _C
<V _R1 , a high-level voltage is output from the comparator 61 and the transistor 65 is turned on, thereby energizing the relay 54 and turning off the normally closed contacts 55 and 69. When the normally closed contact 69 is turned off, the first buzzer 66 sounds, but in this case, because the impedance of the buzzer 66 is high, the heat generation temperature of the indirect heater 68 gradually decreases, and after a certain period of time, the bimetal switch 67 is turned off. and the sound stops. In this way, the first buzzer 66 indicates that slow-drying cotton clothing has reached a drying rate of approximately 80%; in other words, as is clear from FIG. 6, continuous drying synthetic fiber clothing has reached a drying rate of approximately 100%. Report what has happened. On the other hand, when the normally closed contact 55 is turned off, the relay 56 is de-energized, and since the cam switch 20 has already been turned off, the relay 56 is kept de-energized from now on. Since the normally open contacts 59 and 60 are turned off due to the power cut in the relay 56, the power to the comparator 61 is cut off and the power is cut off, and from this point on, the transistor 65 is turned on after a delay of the set time of the delay recovery circuit 64. The relay 54 is turned off and the power is cut off. At the same time, the transistor 45 is turned off by turning off the normally open contact 59, so the discharge time constant of the memory capacitor 34 is automatically changed to a long value of T _c , which is the same as that during normal drying (drying rate approximately 100%). At the same time, the power supply to the diode 46 is cut off, so the drying rate setting value of the comparator 36 also becomes approximately 100.
The second setting value V _R2 corresponding to the % drying rate is automatically changed. Therefore, after this automatic change, the operation proceeds toward a 100% drying rate in the same way as described in the above-mentioned "normal drying".

Now, in the above, the first buzzer 66 indicates that the drying rate of quick-drying clothes, such as synthetic fiber clothes, is low among mixed clothes.
When the user opens the door based on the notification that 100% has been reached, the door switch 73 is turned off and the drying operation is interrupted. When the synthetic clothing is taken out in this state and the door is closed, the door switch 73 is turned on and the drying operation is restarted. This restarted drying operation is performed under the drying rate setting value of approximately 100% after the automatic change as described above, and when the drying rate of the remaining non-quick-drying cotton clothing reaches approximately 100%. The operation is terminated.

Further, when the first buzzer 66 sounds as described above, it is also possible to take out the item to be ironed from among non-quick-drying clothes whose drying rate is about 80%.

Note that the present invention is not limited to the above-mentioned embodiments, and the drying operation may be stopped for a certain period of time at the same time as the first buzzer 66 sounds. A lamp may also be provided.

As described above, the present invention automatically changes the drying rate setting value of the comparison circuit that determines the drying rate from the first setting value corresponding to a low drying rate to the second setting value corresponding to a high drying rate during the drying process. By providing a means for automatically changing the drying rate and notifying the automatic change, it is possible to notify when non-quick-drying clothing reaches, for example, 80% drying rate, and then the drying rate of non-quick-drying clothes reaches approximately 100%.
This may prompt the user to take the clothes out of the rotating drum knowing that the drying rate is near, so that the rest of the clothes will be exposed to more hot air after this, which may contribute to saving energy, etc. In addition to being effective, it also prevents deterioration of fabric quality caused by dry clothes being exposed to hot air for a long time.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram of an operating circuit showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation part of the timer, Fig. 3 is a time chart of the timer, and Figs. 4 and 5 are voltage waveform diagrams. , FIG. 6 is a drying rate characteristic curve diagram. In the figure, 1 is an instantaneous value detection circuit, 2 is an instantaneous value storage circuit, 3 is a comparison circuit, 4 is a control section, 5 is a set value automatic change means, 26, 27...electrodes, 34...memory capacitors, 36 , 61...a comparator, and 66 is a first buzzer (notification device).

Claims (1)

[Claims] 1. An instantaneous value detection circuit that has a pair of electrodes in contact with the clothing in the rotating drum and detects the resistance value between the two electrodes when the clothing comes into contact with both electrodes, and the detected instantaneous value output from this detection circuit. an instantaneous value storage circuit that stores the values with priority given to low drying rates, and a first set value corresponding to a low drying rate and a second set value corresponding to a high drying rate. a comparison circuit that compares the output detected drying rate signal; and a comparison circuit that compares the drying rate set value of the comparison circuit with the first set value when the detected drying rate signal reaches the first set value as the operating time elapses. automatic setting value changing means for changing the set value to the second set value;
a notification device that notifies a change in the drying rate set value of the comparison circuit; and automatic stop control of the drying operation when the detected drying rate signal passes through the first set value and reaches the second set value. A dryer comprising a control section that performs the following steps.