JPH07136393A - Hot-air blower for bedding - Google Patents

Abstract

PURPOSE:To prevent a user from being given discomfort or from getting into danger when the control function fails by providing an abnormal state detecting means and a power interrupting means interrupting the power to a heating means and a blowing means regardless of the control of a control means. CONSTITUTION:When the temperature control cannot be properly made due to some abnormality and the air temperature becomes too high although a motor 4 is rotated at a low speed during the heating operation, for example, a high-temperature detecting means 33 generates a high-temperature detection signal. When this state is continued for a prescribed period, a timing means 34 sends an abnormal state signal to a relay off circuit 35, and the abnormal state signal is latched. When the relay off circuit 35 receives the abnormal state detection signal, it turns on a transistor 31 and forcefully turns off a relay driving transistor 30. The drive of a relay 29 is stopped, its setting 29b is opened, and the motor 4 and a heater 6 are de-excited thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a futon blower capable of sending warm air to a futon for drying the futon and heating at bedtime, and more particularly to a safety function thereof.

[0002]

2. Description of the Related Art A warm air blower for a futon is disclosed in, for example, Shoko Sho 62.
Although various proposals have been made, including −630,
Since the conventional one is designed only for futon drying, the hot air temperature is as high as 50 to 70 ° C. Therefore, although the conventional one can be used for heating the futon before going to bed, it cannot be used for heating while sleeping because of the high warm air temperature.

Therefore, the applicant of the present application has filed Japanese Patent Application No. 4-348.
In No. 887, etc., we proposed something that can be used for bedtime heating in addition to futon drying. However, the proposed warm air blower for futon has the following inconvenience when it is used as a heating for sleeping because no countermeasure is taken when the control of sending warm air is not normal.

That is, when the control means composed of a microcomputer (hereinafter referred to as a microcomputer) or the like malfunctions due to noise or the like, the temperature of the hot air becomes abnormally high and the user feels sleepy due to the heat. Waking up,
There was a case where a strong blast continued for a long period of time, causing discomfort similar to dehydration. Further, even if the operation of the microcomputer is kept normal, even if the element controlling the motor and the heater is destroyed, the same discomfort is given to the user. In addition, for example, when the user is in a drunk state while using, if an abnormal state occurs in which high-temperature hot air is continuously blown by strong air flow, dehydration may occur, which may be life-threatening. Conceivable.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and prevents the user from feeling uncomfortable or injuring the user even if the control function of the control means is impaired. The task is to

[0006]

The present invention comprises heating means,
In a warm air blower for a futon, which comprises a blowing unit, a control unit that controls the heating unit and the blowing unit, and blows warm air whose temperature is controlled by the control unit to a futon for a predetermined time,
An abnormal state detecting means and a power disconnecting means for disconnecting the power supply to the heating means and the blower means independently of the control of the control means are provided, and when the abnormal state detecting means detects an abnormal state, the power disconnecting means is provided. Is operated to stop the operation of the heating means and the blower means.

Further, the abnormal state detecting means may be configured to monitor the operating state of the control means and detect the abnormal state of the control means to operate the power disconnecting means.

Further, the abnormal state detecting means monitors the operating state of the air blowing means, and when it detects that the predetermined air blowing state has been performed for a predetermined time or longer which cannot occur in normal operation,
The power cut-off means may be operated.

Further, the abnormal state detecting means monitors the hot air temperature, and when it detects that hot air blowing of a predetermined temperature or higher has been performed for a predetermined time or longer that cannot occur in normal operation, the disconnecting means is operated. It can be configured to.

[0010]

According to the present invention, by the abnormal state detecting means,
When the abnormal state of operation is detected by monitoring the controlled state of the control means, the heating means and the blower means are de-energized and their operations are stopped. You can safely stop the operation before it becomes dangerous.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a warm air blower for a futon and a futon according to an embodiment of the present invention. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is shown in FIG.
FIG. In these drawings, the warm air blower 1 has an intake port (not shown), a discharge port 2 and an operation panel 3 on the outer surface, and a fan (not shown) and a switch between strong rotation and weak rotation inside. A blower 5 having a fan motor 4 capable of heating, a heater 6 and the like are provided. A futon that is suitable for use with the warm air blower 1 is a futon 7, which is made of, for example, a feather and has ventilation passages 8 on both left and right sides, and a connection port 9 is provided at the entrance of the ventilation passage 8. The hose 10 connects the discharge port 2 of the warm air blower 1 and the connection port 9 of the futon 7, and the warm air introduced from the warm air blower 1 passes through the mesh of the cloth provided in the ventilation passage 8 to form the futon 7. Diffuse inside. The warm air blower assembly 11 for the futon of this embodiment is constituted by these members. User 11a is a mattress 11b
And is wrapped in the above-mentioned futon 7 to take a sleep.

The warm air blower 1 can be used as a futon dryer as shown in FIG. When used as a bedding dryer, a drying sheet 12 is connected to the end of the hose 10, the drying sheet is sandwiched between the comforter 13 and the bedding 14, and warm air is blown into the drying sheet. As a result, warm air is blown into the futon through the cloth mesh of the dry sheet to dry the futon. still,
When the above-mentioned specific futon 7 is not used for bedtime heating, it is possible to apply the case of performing such futon drying (for example, separately prepare a dry sheet for bedtime) to perform heating at bedtime.

Next, the circuit block of the warm air blower 1 is shown in FIG.
Shown in. A microcomputer 22 controls the motor 4 and the heater 6 based on the contents programmed in advance. Reference numeral 15 denotes a motor drive circuit for controlling a strong rotation state, a weak rotation state, and an off state of the motor, which executes one of the three states selected by a signal from the microcomputer 22. Reference numeral 16 is an energization control circuit for the heater 6 including a triac.
The heater 6 is turned on / off by a signal from the microcomputer 22. Reference numeral 17 denotes a heating course lamp, which lights up during the heating operation course. Reference numeral 19 denotes a dry course lamp, which lights up during the dry operation course. Reference numeral 18 is a heating key for starting the heating operation course, 20 is a drying key for starting the drying operation course, and 21 is a cancel key. When the cancel key 21 is pressed, the power supply to the motor 4 and the heater 6 is cut off, and the state where no course is selected immediately after the power is turned on (hereinafter referred to as the initial state) is restored. 23
Is a DC power supply circuit that supplies drive power to the microcomputer 22 and each circuit. Reference numeral 28 denotes a warm air temperature detection circuit, which detects the warm air temperature of the discharge port 2 via the temperature sensor 27. The microcomputer 22 takes in this temperature data from Pi1.

Reference numeral 29 is a relay which constitutes a disconnection means for cutting off the power supply to the motor 4 and the heater 6, and is a condenser 2
4, a resistor 25 and a diode 26 supply a driving power source. In the relay 29, when the transistor 30 is turned on, a voltage is applied to the relay coil 29a to close the relay contact 29b, and when the transistor 30 is turned off, the relay contact 29b is opened. The transistor 31 is the transistor 3
This is a transistor for forcibly turning off 0, and when this transistor 31 is turned on, the base current to the transistor 30 stops flowing, so that the transistor 30 cannot be turned on. That is, turning on the transistor 31 turns off the relay 29.

Reference numeral 36 denotes an AC coupling circuit, which periodically causes the output port Po1 (the port of the N-channel open drain in this example) of the microcomputer 22 to repeat the H state and the L state, thereby causing a current to flow through the capacitor 36a to the capacitor 36b. Is supplied to turn on the transistor 36c and turn on the transistor 30 that drives the relay 29. Therefore, if the port Po1 is stopped in the H state, the capacitor 36a remains charged because the cycle of discharging the capacitor 36a disappears, and it is no longer possible to supply the current to the capacitor 36b side through the capacitor 36a. . Therefore, the transistor 36c turns off and the relay driving transistor 30 also turns off. Similarly, when the port Po1 is stopped in the L state, the capacitor 36a is also used to stop.
Since the current cannot be supplied to the b side, the transistor 36c turns off and the relay driving transistor 30 also turns off. In this way, the AC coupling circuit 36 only operates when the microcomputer 22 periodically turns Po1 on (L state) and off (H state).
Although 0 can be turned on and kept on, the relay driving transistor 30 is turned off in any other state. In other words, the AC coupling circuit 36
Is an abnormal state detecting means for monitoring the operating state of the microcomputer 22 and detecting an abnormal state where the operation of the microcomputer 22 becomes abnormal or the port Po1 cannot be turned on / off periodically due to an abnormality in the port itself. Make up one.

Reference numeral 32 is a motor strong rotation detecting means for monitoring the driving state of the motor driving circuit 15 and for generating a strong rotation detection signal when detecting that the motor 4 is being strongly rotated.
Reference numeral 33 is a high temperature detecting means for generating a high temperature detection signal when the air temperature is equal to or higher than a predetermined temperature Te through the temperature sensor 27.
These motor strong rotation detecting means 32, high temperature detecting means 33,
The clocking means 34, which will be described later, is constituted by a circuit independent of the microcomputer 22 so that it can operate even when the microcomputer 22 is in an abnormal state, but it can be incorporated inside the microcomputer 22 together with other control means. Numeral 34 is a timing means for starting timing when either the strong rotation detection signal or the high temperature detection signal, or both signals are inputted, and continuing the timing until neither signal is inputted. Is configured to be reset when no input is made. And this time measuring means 3
4 transmits an abnormal state detection signal to the relay-off circuit 35 when it measures a predetermined time t e. If the warm air blower 1 is operating normally, the predetermined time te is longer than the motor 4
Is set to be the longer one of the time when no strong rotation should continue and the time when the high air temperature detected by the high temperature detection means 33 should not continue any more. There is. Further, the time measuring means 34,
A latch circuit is provided for holding the abnormal state detection signal once it is output until the power is cut off. Upon receiving the abnormal state detection signal, the relay off circuit 35 turns on the transistor 31 and forcibly turns off the relay driving transistor 30. That is, the motor strong rotation detecting means 32, the time measuring means 34, the relay off circuit 35.
Is one of abnormal state detecting means for monitoring the energization state of the motor 4 and detecting that the motor 4 is energized for a time longer than the normal operation. Further, the high temperature detecting means 33, the time measuring means 34, and the relay-off circuit 35 are one of the abnormal state detecting means for monitoring the hot air temperature and detecting that the temperature continues to be high for a time that cannot occur in normal operation. Are configured.

Next, the operation of the warm air blower 1 having such a configuration will be described. First, when the power is turned on, the microcomputer 22 starts the operation of turning on / off the port Po1 at 2 kHz. Then, the above-mentioned AC coupling circuit 36
The relay 29 is driven via the relay contact 29b and the relay contact 29b is closed. After that, the microcomputer 22 turns the heating course lamp 17,
The dry course lamp 19 is made to blink, and the state is waiting for the start input of either course. In this state,
The motor 4 and the heater 6 are off. Microcomputer 2
2 is programmed to keep port Po1 on and off at 2 kHz until powered off.

Next, the operation when each driving course is started will be described. First, the operation of the heating course will be described. When the heating key 18 is pressed in the initial state, the microcomputer 22 turns on the heating course lamp 17 and turns off the other operation course lamps.
A signal for slightly rotating the motor 4 is sent to 5. On the other hand, the energization control circuit 16 is controlled by the temperature setting Tr for heating operation (assuming that the temperature is fixed at 34 ° C. in this embodiment) and the hot air temperature data obtained from the air temperature detection circuit 28, and the heat generation amount of the heater 6 is controlled. Is started to control the warm air temperature to the set temperature Tr. At the same time, a timer M1 (built in the microcomputer 22) that measures the elapsed time from the start of operation is started (the time measured by the timer M1 is t
Represented by 1.) After that, from the operating time setting tr of heating operation (in this embodiment, it is assumed that it is fixed at 8:00 minutes), the timer M is set.
The operation of controlling the warm air temperature to Tr is continued while weakly blowing air until the remaining time (tr-t1) obtained by subtracting the time counting time t1 of 1 becomes zero. Remaining time after 8 hours (tr-t1)
When becomes zero, it returns to the initial state.

Next, the operation of the drying course will be described.
When the dry key 20 is pressed in the initial state, the microcomputer 22 turns on the dry course lamp 19, turns off the other operation course lamps, and at the same time sends a signal to the motor drive circuit 15 to strongly rotate the motor 4. On the other hand, the amount of heat generated by the heater 6 is controlled by controlling the energization control circuit 16 based on the temperature setting Td of the drying operation (this embodiment assumes that the temperature is fixed at 50 ° C.) and the hot air temperature data obtained from the air temperature detection circuit 28. To start the operation of controlling the warm air temperature to the set temperature Td. At the same time, the timer M1 for measuring the elapsed time from the start of the operation is started. Thereafter, strong air is blown until the remaining time (td-t1) obtained by subtracting the measured time t1 of the timer M1 from the operation time setting td of the dry operation (this embodiment assumes that it is fixed at 1 hour 30 minutes) becomes zero. Meanwhile, the operation of controlling the warm air temperature to Td is continued. When 1 hour and 30 minutes have passed and the remaining time (td-t1) becomes zero, the state returns to the initial state. The microcomputer 22 is programmed to accept only the cancel key 21 during driving once each driving course is started.

As described above, when the operation is normally performed, the time during which the motor 4 is strongly rotating is up to 1 hour and 30 minutes, and the time during which the motor 4 is slightly rotating is 8 hours. It should be up to 00 minutes. Also, the temperature sensor 2
The wind temperature detected by 7 is the temperature setting Tr of the heating course.
Higher than (34 ℃) and temperature setting Td of the drying course
The time for which the predetermined temperature lower than (50 ° C.), for example, the state higher than 42 ° C., should be within 1 hour and 30 minutes of the operation time of the drying course at the maximum.

Therefore, the set temperature Te at which the high temperature detecting means 33 outputs the high temperature detecting signal is set to 42 ° C., and the detection time te of the time measuring means 34 is 1 hour and 45 minutes with a 15 minute margin depending on the accuracy of the time measuring means. (1 hour 30 minutes + 15 minutes)
Is set and monitored, it is possible to detect an abnormality in the energization state of the motor 4 and an abnormality in the warm air temperature.

That is, when the motor 4 continues to be in a strong rotation state for a long time due to some abnormality (for example, a failure of the motor drive circuit 15), the motor strong rotation detection means 32 continues to output a strong rotation detection signal. With this signal, the time counting means 34 continues the time counting operation, and when the time counting time reaches the detection time te (1 hour 45 minutes), it sends an abnormal state detection signal to the relay off circuit 35, and this abnormal state detection signal is latched.
Upon receiving the abnormal state detection signal, the relay-off circuit 35 turns on the transistor 31 and forcibly turns off the relay driving transistor 30. As a result, the drive of the relay 29 is stopped and its contact 29b is opened.
Also, the heater 6 is not energized.

Further, for example, during the heating operation, the motor 4 is slightly rotated due to some abnormality (for example, a failure of the heater energization control circuit 16 or a failure of the air temperature detection circuit 28), but the temperature control cannot be performed normally, and the air temperature is reduced. Is high and the air temperature is higher than the detected temperature Te (42 ° C.) of the high temperature detecting means 33, the high temperature detecting means 33 generates a high temperature detecting signal. When this state continues for 1 hour and 45 minutes, the time measuring means 34 continues the time measuring operation and reaches the detection time te,
An abnormal state detection signal is sent to the relay off circuit 35, and this abnormal state detection signal is latched. Relay off circuit 35
Receives the abnormal state detection signal, turns on the transistor 31 and forcibly turns off the relay driving transistor 30. As a result, the drive of the relay 29 is stopped and its contact 29b is opened, and thereafter, neither the motor 4 nor the heater 6 is energized.

To summarize the above, the strong rotation of the motor 4 is 1
When the time continues for 45 minutes, the energization of the motor 4 and the heater 6 is forcibly stopped thereafter regardless of the air temperature. The wind temperature is Te (42
If the above temperature continues for 1 hour and 45 minutes, the motor 4 and the heater 6 are forcibly stopped from energizing even after the motor 4 is slightly rotated.

If the microcomputer 22 runs out of control due to noise or the like, the program operation will not be performed normally, so the port Po1 will be fixed in the on or off state, and the AC coupling circuit 36 will operate. Then, the relay 29 stops driving immediately, and the power supply to the motor 4 and the heater 6 is forcibly stopped.

In this way, in the unlikely event that the motor 4 and the heater 6 are
Even if the control cannot be performed normally, the warm air blower 1 of the present embodiment can considerably reduce the discomfort of the user, and in the worst case, prevent the life of the user from being endangered. , Safety is secured.

In the above embodiment, the temperature setting Tr for heating operation is assumed to be a fixed temperature of 34 ° C. and the temperature Te detected by the high temperature detecting means 33 is set to 42 ° C. However, the temperature setting Tr for heating operation is When the variable type is used, a temperature obtained by adding a predetermined temperature to the maximum set temperature may be set as the detected temperature Te. Similarly, in the above embodiment, the operating time setting td for the drying operation is assumed to be a fixed time of 1 hour 30 minutes, and the detection time te of the timing means 34 is set to 1 hour 45 minutes. When td is made variable, the time obtained by adding a predetermined margin time to the maximum set time is the detection time te.
You can set it to.

Further, in the above embodiment, the detection time of the time measuring means is only te (1 hour 45 minutes), but the time set corresponding to the time when the motor strong rotation detection signal is output, It is also possible to separately set the time set corresponding to the time when the high temperature detection signal is output.

In the above embodiment, the relay 29 is used as the disconnecting means. However, if a heating element is provided in the vicinity of the temperature fuse (TF) and the abnormal state detecting means detects an abnormal state, the heating element will generate heat. The same effect can be obtained even if the temperature fuse is cut off. In this case, once the thermal fuse is blown, it cannot be used again, so that the user can be prevented from trying to use the defective product again.

[0030]

As described above, according to the present invention, even if the motor or the heater cannot be controlled normally, the fail-safe function is provided. In this case, it is possible to provide a safe warm air blower for the futon that does not endanger the user's life.

[Brief description of drawings]

FIG. 1 is a front view showing an example of use of a warm air blower for a futon according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a partially cutaway front view showing another usage state of the embodiment.

FIG. 5 is an electric circuit block diagram of the warm air blower for the futon of the embodiment.

[Explanation of symbols]

 1 Warm air blower 4 Motor 5 Blower 6 Heater 7 Futon 15 Motor drive circuit 16 Energization control circuit 22 Microcomputer 28 Warm air temperature detection circuit 29 Relay 32 Strong rotation detection circuit 33 High temperature detection circuit 34 Timing means 36 AC coupling circuit

Claims (4)

[Claims] 1. A warm air blower for a futon, which comprises a heating means, a blowing means, and a control means for controlling the heating means and the blowing means, for blowing warm air whose temperature is controlled by the control means to a futon for a predetermined time. In the above, an abnormal state detecting means and a power disconnecting means for cutting off the power supply to the heating means and the blower means independently of the control of the control means are provided, and when the abnormal state detecting means detects the abnormal state, the disconnection is performed. A warm air blower for a futon, characterized in that an electric means is operated to stop the operations of the heating means and the blowing means. 2. The abnormal state detecting means is configured to monitor the operating state of the control means and detect the abnormal state of the control means to operate the power disconnecting means. Warm air blower for the futon described. 3. The abnormal state detecting means monitors the operating state of the air blowing means, and when it detects that the predetermined air blowing state has been performed for a predetermined time or longer that cannot occur in normal operation, it operates the power disconnecting means. The warm air blower for a futon according to claim 1, which is configured. 4. The abnormal condition detecting means monitors the warm air temperature, and when it detects that warm air blowing at a predetermined temperature or higher has been performed for a predetermined time or longer that cannot occur in normal operation, it operates the disconnection means. The structure according to claim 1, characterized in that
Warm air blower for the futon described.