JPH0788827B2 - Blower operation controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operation control device for a blower such as a range hood fan that measures temperature and automatically operates the blower.

[Conventional technology]

Conventionally, the one that measures the temperature and automatically operates the blower includes one that uses two temperature sensors to detect and control the relative change and one that uses absolute temperature. There are two types, one that captures and controls the temperature.

FIG. 8 is a circuit diagram showing an operation control device for a conventional blower, which uses two temperature sensors disclosed in, for example, Japanese Utility Model Publication No. 59-37613 to detect and control the relative change thereof. This circuit is an automatic-manual switch
A circuit that supplies commercial power to the fan motor FM including _S2a , manual operation switch _S3a, etc.
It is composed of a circuit for controlling the drive of the fan motor FM by using the DC voltage V _cc obtained via T ₁ , the diode D ₁ and the smoothing capacitor C ₁ as input. The fan motor FM used here is a motor that has a high-speed winding HW and a low-speed winding LW and is capable of speed switching.

The control circuit detects the temperature near the heat source Thermistor Th ₁
And a thermistor Th ₂ for detecting the room temperature and a bridge circuit composed of resistors R ₁ and R ₂ and a comparator Z ₁ and a transistor Q ₁ ,
A circuit for supplying power to the high-speed winding HW according to the difference between the heat source temperature during automatic operation and the room temperature by the relay RL _1, and a timer circuit T including a timer Z ₂ and a resistor R ₁₀ and a capacitor C _4.
And a circuit for supplying power to the predetermined time slow winding LW by the transistor Q ₄ and the relay RL _2, and a integration circuit by the transistor Q _2, Q ₃ and the capacitor C ₃ and resistor R _8, the comparator Z ₁ And a circuit for giving a start signal to the timer circuit T when the output is lost or the manual operation switch S ₃ is turned off.

The control circuit is provided with switches S _2b and S _{2c which} are interlocked with the manual / automatic changeover switch S _2a.When the switch _2a is on the automatic side, the switch S _2b is turned on and the switch S _2c is turned off. In addition to this, a switch _3b is provided which is interlocked with the manual switch _S3a . The switches S _3a and S _3b are pushbutton switches, and each has a pushbutton switch H _i for high-speed operation and a pushbutton switch L _o for low-speed operation that can be locked individually, and further, the switch S _3a is respectively It has an operation stop pushbutton OFF for releasing the lock of the push button switch H _i or push-button switch L _o. Of course, there is no need for a lock mechanism to turn off the push button.

The conventional blower operation control device is configured as described above,
First, in the case of automatic operation in which the power switch S ₁ is turned on and the switch S _{2a is set} to the automatic side, the temperature of the heat source rises when the gas range is ignited and the temperature detected by the thermistors Th ₁ and Th ₂ is set to the predetermined temperature. When a difference more than the value occurs, the bridge circuit becomes unbalanced and the comparator Z ₁ outputs a signal to make the transistor Q ₁ conductive. As a result, the relay RL ₁ operates and the contact of the contact rl ₁ is closed, so that the fan motor FM causes the high-speed winding H
Power is supplied to W for high speed exhaust movement.

At the same time, the output of the comparator Z ₁ makes the transistor Q ₃ conductive via the diode D ₄ . Here, the timer Z ₂ is an input terminal when the clear terminal CL is cut off from the ground side.
When a signal is input to IN, it has a timer function to turn on transistor Q ₄ for a time determined by the time constant determined by resistor R ₁₀ and capacitor C ₄ from output terminal OUT, and clear terminal CL is turned on again to the ground side. For example, the output from the output terminal OUT is reset. Therefore, the transistor Q ₃ also maintains the conduction state during the combustion, and the timer circuit T does not operate. Also, even if the gas range is extinguished, transistor Q ₁ will remain conductive as long as the output of comparator Z ₁ is present, so fan motor FM will continue high-speed exhaust operation, but the heat source temperature will drop sufficiently and the bridge circuit will When it returns to the equilibrium state, the output of comparator Z ₁ disappears and the transistor
The Q ₁ and relay RL ₁ are turned off and the power supply to the high speed winding HW is cut off. At the same time, the transistor Q _{3 is} also turned off and the clear terminal CL of the timer Z ₂ is cut off from the ground side. Subsequently, the transistor Q ₂ is turned on for a short time due to the integration circuit of the capacitor C ₃ and the resistor R _8, and the cutoff signal of the voltage V _cc is input to the input terminal IN of the timer Z ₂ . The timer circuit T operates by this cutoff signal and outputs a signal from the output terminal OUT of the timer Z _{2 for} a certain period of time determined by the time constant of the resistor R ₁₀ and the capacitor C ₄ , which causes the transistor Q ₄ relay RL _{2 to} have a certain period of time. Working fan motor FM
When the contact rl ₂ for directly supplying power to the low speed winding LM is closed, the fan motor FM is switched to the low speed exhaust operation, and the relay RL ₂ is automatically stopped after a certain time when the relay RL ₂ is turned off.

Even when the timer circuit T is operating and the gas range is reignited, the bridge circuit immediately becomes unbalanced and the transistors Q ₁ and Q ₃ are turned on by the output of the comparator Z _1. Therefore, the output terminal of the timer Z ₂ The signal from OUT is immediately reset, relay RL ₂ is turned off, and relay RL ₁ is turned on to switch to high speed operation again.

Next, the case of manual operation will be described.

When the switch S _2a is switched to the manual side, the switch S _2b is turned off and the output of the comparator Z ₁ is always shut off.
The switch S _2c is turned on. When the push button switch H _i of the switch S _3a is pushed after ignition to the gas range, the fan motor FM starts high-speed operation, and the push button switch H _i of the switch S _3b is also locked. This transistor Q ₃ are rendered conductive via the diode D _7, resistors R _9, never operated while the timer circuit T of the fan motor FM are operated.

Here, when the operation stop push button OFF of the switch S _3a is pressed,
The pushbutton switches H _i of the switches S _3a and S _3b are both restored and turned off. As a result, the transistor Q ₃ turns off, so that the timer Z ₂ clear terminal is the same as in the automatic operation.
CL is cut off from the ground side, and capacitor C ₃ and resistor
When the transistor Q ₂ is turned on for a short time by the integrating circuit by R ₈ , a cutoff signal is input to the input terminal IN of the timer Z ₂ and the timer circuit T operates, which causes the relay RL ₂ to operate for a certain period of time. The fan motor FM is automatically stopped after performing a low-speed exhaust operation for a certain period by the power supplied via its contact rl ₂ . Of course, even if the pushbutton switch H _i or L _o is pressed while the timer circuit T is operating, the transistor Q ₃ becomes conductive immediately and the timer circuit T is reset, and the pushbutton switch H _i or the switch S _3a is pressed. _Switch to manual operation via Lo. The operating time of the relay RL ₂ by the timer circuit T can be set arbitrarily.

FIG. 9 is a circuit diagram showing a control device of a conventional air conditioner in which a single temperature sensor disclosed in Japanese Utility Model Laid-Open No. 58-133732 is used to capture and control the absolute temperature, for example. In the figure, (1a) is the thermistor and (2a) (3a) (4
a) (5a) is a resistor, (6a) is a variable resistor, (7a) is a voltage comparator, (8a) is a current amplifier, (9a) is a drive load,
The variable resistor (6a), the resistors (2a) (3a) (4a) and the thermistor (1a) form a resistor bridge circuit.

The air conditioner controller thus configured sets the voltage difference between points A and B to an appropriate value by adjusting the variable resistance, and when the resistance value of the thermistor (1a) changes due to temperature change, When the voltage at point A becomes higher or lower than the voltage at point B, the output of the voltage comparator (7a) is inverted,
The current amplifier (8a) turns the drive load (9a) on and off.

[Problems to be solved by the invention]

In the conventional blower operation control device as described above, when the automatic operation is performed using the relative value of the thermistors Th ₁ and Th ₂ as in the former case, the thermistor Th that detects the temperature near the heat source is detected.
_{When 1} is significantly cooled by the ingress of outside air when the outside air is low such as in winter, the response of the blower operation will be slow, and in the latter case when the absolute value of the thermistor (1a) is used for automatic operation Had a problem that the variable resistor (6a) had to be adjusted according to changes in ambient temperature to always set the optimum sensitivity.

The present invention has been made to solve the above problems, and an object thereof is to obtain a blower operation control device with good responsiveness without making special settings even if the temperature thermometer near the heat source is significantly cooled. To do.

[Means for solving problems]

The blower operation control device according to the present invention includes a blower having a switching notch, a switching means for switching the notch of the blower, a high-temperature thermometer for measuring the temperature of gas rising from a heat source such as a range, and an ambient temperature around the blower. A low temperature thermometer for measuring the temperature, a measuring means for measuring temperature signals from the high temperature thermometer and the low temperature thermometer at predetermined time intervals, and a calculating means for calculating a temperature difference between the measured temperature of the high temperature thermometer and the measured temperature of the low temperature thermometer. And a storage means for storing a plurality of high-temperature thermometric data measured by the measurement means, and an operating means for operating the blower, the operating means having a range of a temperature difference value in which the result of the calculating means is preset. If it is within the range, the switching means is operated, and when the blower is stopped by this operation, the value of the final data stored in the storage means is stored. The value of the other data is at a temperature rise state having a predetermined temperature range is assumed to operate the blower by operating the switching means.

[Action]

In the present invention, the temperature difference between the measurement temperature of the high temperature thermometer that measures the temperature of the gas rising from the heat source such as the range and the measurement temperature of the low temperature thermometer that measures the ambient temperature around the blower is set in advance. If it is within the range, the switching means operates. At this time, when the blower is selected to be stopped by this operation, the switching means operates in a temperature rising state in which the value of the other data stored with respect to the value of the final data stored in the storage means has a predetermined temperature range. It will operate and the blower will be operated. That is, the operation of the blower is started on the basis of whichever of the operating conditions, which is the difference in temperature value between the two temperature thermostats and the temperature increase of the high temperature thermostat, whichever comes first.

〔Example〕

1 to 7 are views showing an embodiment of the present invention,
In FIG. 1, (1) is a range hood fan main body,
(2) has three taps and can blow air with three-step notches of weak, medium, and strong, (3) is an illumination lamp, (4) and (5) are temperatures above the range. A temperature sensor for measuring (hereinafter referred to as high temperature thermo), (6) is a temperature sensor for measuring indoor temperature (hereinafter referred to as low temperature thermo),
(7) is a control panel having a control switch and an indicator lamp, and (8) is a cooking range.

FIG. 2 is a control circuit diagram, and (58) is an A / D conversion microcomputer (hereinafter referred to as a microcomputer) as an operating means for operating the blower (2), and an A / D conversion input port K
₀ and K ₁ . Immediately after resetting, the other terminals are all at the output “H” level. (9) is the power circuit, (10) is A /
D converter, (11) key input, (12) load driver,
(13) is a display section, and (14) is an oscillation circuit section.

In the A / D conversion circuit section (10), (15) and (16) are resistors,
(4) (5) is a high temperature thermostat, (6) is a low temperature thermostat, and the low temperature thermostat (6) and the high temperature thermostat (4) (5) use thermistors whose resistance constants change with temperature changes. The resistance (1
5) The voltage division value of (16) fluctuates. Input the value into the A / D conversion input K ₀ K ₁ of the microcomputer (58), and
Calculate the temperature value of each thermometer in 8).

In the key input section (11), (17) to (22) are transient key switches, and (60) to (62) are pull-up resistors. In order to confirm whether or not each key switch (17) to (19) is pressed by the microcomputer (58), first, INT, S
₀ Set S ₁ terminal to input mode, set S ₂ to “H” level and S ₃ to “L” level. Then, the key switch (20) ~
When (22) is pressed, INT, S ₀ , S ₁ drop to the “L” level and it is possible to check whether the key switch has been pressed. Then, the S ₂ "L" level, when the S ₃ to the "H" level, respectively, when the key switch (17) to (19) is pressed INT, S _0, drop S ₁ is the "L" level Then, it is possible to confirm whether the key switch has been pressed.
From the above, when the keys of the key switches (17) to (22) are received, the buzzer (57) is turned on for 75 ms to confirm it.
Turn it on for a while.

In the load drive unit (12), (2) is the blower described in FIG. 1, (3) is an illumination lamp, and (39) to (41) are for making the blower (2) weak, medium, and strong, respectively. Switch bidirectional thyristors, (42) lamp (3) switch bidirectional thyristors, (23) to (26) microcomputers (58)
F _{0 to} F ₃ port current amplification driver, ON at input “L” level, output structure is N channel open collector. (31) to (34) are LEDs that indicate the ON state of the drivers (23) to (26), (27) to (30) are current limiting resistors for these LEDs, and (35) to (38) are bidirectional. Thyristor (39) ~ (4
This is the gate current limiting resistor in 2). The driving procedure of the bidirectional thyristors (39) to (42) is as follows. F port "L" level of the microcomputer (58), for example, F ₀ the port becomes "L" level driver (23) is turned ON. When the driver (23) is turned on, a current flows from the gate of the bidirectional thyristor (39) through the resistor (35) and the LED (31) and resistor (27) that are provided in parallel with the resistor (35) and are connected in series. It flows into the output of (23). Then, the bidirectional thyristor (39) is turned on and the blower (2) starts operating.

In the display section (13), (50) to (56) are display LEDs,
(43) to (49) are resistors for limiting the current of this LED. When the D port (D _{0 to} D ₆ ) of the microcomputer (58) becomes “L” level.
LED lights up. (57) is a buzzer, which self-oscillates and sounds when D ₇ becomes "L" level.

In the oscillator circuit (14), reference numeral (59) is a resistance, and the resistance causes the microcomputer (58) to self-oscillate and serve as a system clock source for a built-in program.

FIG. 3 is a front view showing the control panel (7) of the range hood body (1), which includes (31) to (34) and (50).
(56) is a display LED shown in FIG. 2, and (17) to (22) are key switches.

FIG. 4 is a flowchart in the manual operation mode, fifth
The figure shows the flow chart in the automatic driving mode, and Fig. 6 shows the notch selection in the automatic driving.
FIG. 7 is an explanatory diagram showing the temperature difference between the high temperature thermostat and the low temperature thermostat and the air volume (notch of the blower) selection during automatic operation.

The operation of the blower operation control device configured as described above will be described below.

The function of the range hood body (1) is the manual operation mode,
It is roughly divided into automatic operation modes. Each time you press the key switch (17), the LED (50) will repeatedly turn on and off. L
When ED (50) is lit, automatic exercise mode, LED (5
When (0) is off, it is the manual exercise mode.

In the manual movement mode, when pressing the key switch (21) to select the notch of the blower (2), the F port of the microcomputer (58) operates each time it is pressed, and the drivers (23) to (25) are turned on one by one. Then, the bidirectional thyristors (39) to (41) are sequentially turned on one by one. Along with this, the blower (2) is weak →
The notch switches in the order of medium → strong → weak. When viewed from the control panel (7) side, the display LED is weak (33) → medium (3
2) → Strong (31) → Weak (33) lights sequentially.

There are two ways to stop the blower (2).

One is to press the key switch (21). Then, the drivers (23) to (25) are all turned off, and the bidirectional thyristors (39) to (41) are all turned off. Therefore, the power supply to the blower (2) is stopped and the blower (2) is stopped. At this time, the microcomputer (58) backs up the notch just before stopping.

The other one is to activate the timer operating mode,
When the key switch (22) is pressed, the display LED will change to 5 each time it is pressed.
Minutes (51) → 10 minutes (52) → 30 minutes (53) → 5 minutes (51) are fed in sequence, and the blower (2) operates for the displayed time, and stops after the displayed time has elapsed. Also at this time, the microcomputer (58) backs up the notch just before the stop. The timer operation mode operates not only during the operation of the blower (2) but also during the stop, and when the key switch (22) is pressed, the microcomputer (58) is activated before the stop.
The blower (2) operates with the notch backed up to
Stop after display time. Since the air volume switching key is accepted even during the timer operation, the air volume can be arbitrarily set by the user.
The time display LED in the timer operation mode also indicates the remaining time. For example, if the timer is set to 30 minutes, it will be 30
The minute display LED (53) lights up, and when the timer time has elapsed and the remaining time reaches 10 minutes, the 30 minute display LED (53) turns off and 1
The 0 minute LED (52) lights up. When the time further elapses and the remaining time reaches 5 minutes, the LED (52) for 10 minutes disappears and the LED (51) for 5 minutes lights up. After 5 minutes, the timer operation is stopped, the LED (51) for 5 minutes is turned off, and the blower (2) is also stopped. If the off key switch (20) is pressed during timer operation, the timer is cleared and the blower (2)
Can be stopped.

Next, the automatic operation mode will be described.

The operation of the blower (2) is basically a high temperature thermo (4) (5)
And A / D conversion data of low temperature thermo (6). There are the following three operating conditions of the blower (2) in the automatic operation mode.

The first is a differential temperature operation mode between the high temperature thermostats (4) and (5) and the low temperature thermostat (6). As shown in the flowchart of notch selection during automatic operation in FIG.
The temperature difference between the voltage change value due to temperature change in (5) in the microcomputer (58) and the temperature change value due to temperature change in the low temperature thermostat (6) in the microcomputer (58) As a result, as shown in the flow charts of FIGS. 7 and 6, if the blower (2) is stopped, weak notch air is blown with a temperature difference of T ₂ or more, and if the blower (2) is weak notch blown
Medium notch blowing temperature difference of T ₄ or more, and stops at a temperature difference of T ₁ or less, if the middle notch blowing state strong notch blowing at T ₆ above temperature difference, and the weak notch blowing temperature difference of T ₃ below , If it is a strong notch blower, it blows a medium notch with a temperature difference of T ₅ or less. Above, the temperature value from T _{1 to} T ₆ is the key switch for sensitivity adjustment (18)
Set by. Each time you press the key switch (18), the display is standard (55) → high sensitivity (56) → low sensitivity (5
4) → Standard (55) is sent in sequence. The difference in temperature setting values between low sensitivity, standard, and high sensitivity is that the low sensitivity has a larger value of T _{1 to} T ₆ than the standard, and the standard has a larger value of T _{1 to} T ₆ than the high sensitivity, and the air blowing notch is difficult to change due to the temperature difference. Secondly, the temperature change rate of the high temperature thermostats (4) and (5) is investigated, and the blower (2) is operated with a weak notch. This is, for example, when the cooking range (8) is started, the high temperature thermos (4) (5)
The temperature difference between the low temperature thermostat and the low temperature thermostat (6) is reversed,
It takes time until the difference reaches a temperature difference level T ₂ of the time-temperature operation, or, if it takes time until the heat of the cooking range to reach the less T _2, in order to speed up the operation start of the air blower (2) To do. Assuming that A / D conversion of the high temperature thermos (4) and (5) is performed every 4 seconds, 8 A / D converted data are stored in memory and each time new data is input, the data is replaced for 28 seconds. Can be held. The blower (2) when any one of the other data exceeds the preset temperature (for example, 1 ° C) value for the final data in the 28 seconds, that is, when the preset temperature rises within 28 seconds. Starts driving with a weak notch. Its operating time is 3 minutes. When the temperature difference between the high temperature thermostats (4) and (5) and the low temperature thermostat (6) reaches T ₂ within 3 minutes, the operation mode is changed from the rate-dependent operation mode to the differential temperature operation mode. If the temperature difference does not reach T ₂ after 3 minutes, stop the blower (2).

The third is an operation mode by forced operation. Basically, human operation is not required during automatic operation, but forced operation artificially switches the notches to the automatic notch selection of the microcomputer (58). When the blower (2) is operating, for example, if the air is blown in the middle notch, the notch will switch from strong to weak → medium to strong every time the key switch (21) is pressed, and the specified notch will force the switch for 3 minutes. After being operated, the operation mode is changed to the operation mode based on the differential temperature or the operation mode based on the rate of change of the high temperature thermostats (4) and (5). When the blower (2) is stopped, pressing the key switch (21) first weakens the notch. After that, every time the key switch (21) is pressed, the mode is changed from medium to strong to weak, and as described above, the operation mode is changed to the operation mode by the differential temperature after the forced operation for 3 minutes or the operation mode by the change rate.

The above is the description of the operation in the manual operation mode and the automatic operation mode.

The key switch (20) is a key switch having a function of "off", and this key switch is applied to all the functions other than turning on / off the lamp. When the key switch (20) is pressed, the mode becomes manual, the timer operation is stopped, and the blower (2) is also stopped.

Further, the range hood body (1) constantly monitors the temperature above the range by A / D conversion, and issues a warning when the temperature rises abnormally. That is, the temperature value of the high temperature thermostat (4) (5) is 60
When the temperature rises above ℃, a buzzer (57) sounds to notify the user that an abnormal temperature rise has occurred.

When switching the bidirectional thyristor, since there is a maximum half cycle delay from turning off the gate current to turning off the bidirectional thyristor, power supply is stopped for 100 ms when switching the notch, and two bidirectional thyristors are turned on at the same time. I try not to.

〔The invention's effect〕

As described above, the present invention starts the operation of the blower based on whichever of the operating conditions, which is the difference in temperature between the two temperature thermostats or the temperature rise of only the high temperature thermostat, whichever comes first, and starts the operation of the blower. Can be used together with the temperature difference between the high temperature thermostat and the low temperature thermostat and the control by the temperature rise rate of the high temperature thermostat,
Even if the temperature rises slowly with a temperature difference, there is an effect that the blower can be quickly operated at the temperature rise rate.

[Brief description of drawings]

1 is a perspective view showing a range hood using an embodiment of the present invention, FIG. 2 is a circuit diagram showing an embodiment of the present invention, FIG. 3 is a front view of the control panel, and FIG.
FIG. 5 is the same flowchart in the manual operation mode, and FIG. 5 is the same flowchart in the automatic operation mode.
FIG. 6 is a flow chart showing notch selection during automatic operation, and FIG. 7 is a temperature difference between the high temperature thermostat and the low temperature thermostat during automatic operation and the air volume (notch of the blower).
FIG. 8 is a circuit diagram showing a conventional blower operation control device, and FIG. 9 is a circuit diagram showing a conventional air conditioner control device. In the figure, (2) is a blower, (4) and (5) are high temperature thermostats, (6) is low temperature thermostat, (9) is power supply circuit section, and (10).
Is an A / D conversion unit, (11) is a key input unit, (12) is a load drive unit, (13) is a display unit, (14) is an oscillation circuit unit, and (58) is a microcomputer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F24F 7/007 B

Claims (1)

[Claims] 1. A blower having a switching notch, a switching means for switching the notch of the blower, a high temperature thermometer for measuring the temperature of gas rising from a heat source such as a range, and a low temperature thermometer for measuring the ambient temperature around the blower. A measuring means for measuring temperature signals from the high temperature thermostat and the low temperature thermometer at predetermined time intervals, and a calculating means for calculating a temperature difference between the measured temperature of the high temperature thermometer and the measured temperature of the low temperature thermostat. A storage means for storing a plurality of the high temperature thermometric data measured by the measurement means, and an operating means for operating the blower, the operating means being provided with a differential temperature in which the result of the calculating means is preset. If it is within the range of the value, the switching means is operated, and when the operation causes the blower to be stopped, the final value stored in the storage means is stored. The operation of the blower is characterized in that the switching means is operated to operate the blower in a temperature rising state in which the value of other data stored with respect to the value of the data has a predetermined temperature range. Control device.