JPS6136041Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a self-holding switch circuit that is convenient for switching electrical equipment that does not want to continue operating after the power outage when a power outage occurs during operation. This article relates to this type of built-in switch circuit.

For example, some oil burners such as oil heaters use electric circuits to control ignition, fuel supply, and air blowing. In such devices, if a power outage occurs during combustion, combustion will stop, but unless the power supply circuit is disconnected, the ignition will automatically restart after the power outage ends, which is a problem in many ways. It is a danger.

For this reason, a switch circuit is used in which a relay and a pushbutton switch are connected in series, and a contact that is normally open, that is, closed when the relay is operated, is connected to the pushbutton switch in parallel. In this switch circuit, when a push button is operated, the relay self-holds and supplies power to the load. When a power outage occurs, the relay's self-holding is released, so power is not supplied to the load when the power is turned on again. .

On the other hand, it is convenient for various types of electrical equipment to be equipped with a timer circuit that automatically starts or stops the equipment after a certain period of time. For example, in the case of the above-mentioned kerosene heater, it can be turned off automatically even if you go to bed while keeping warm, or it can be turned on automatically before you wake up. This usually has a built-in motorized timer so that the timer is automatically set by turning a knob.
In the previous version, if you set it during combustion, it meant that you had set auto-extinguishment, and if combustion was stopped, it meant that you had set auto-ignition. It was impossible to set up a fire that would automatically extinguish the fire and then automatically relight after 5 hours.

In contrast, the present invention attempts to provide a self-holding switch circuit that can set both the automatic power supply stop using a timer and the automatic power supply restart after the stop. A similar automatic power supply stop or automatic power supply start set can be performed, and another timer can be used to perform the automatic power supply stop set.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit of an embodiment of the present invention.

In the figure, the normally closed operation stop pushbutton switch
Connect PB ₁ and relay RLA and its normally open contact a ₁ in series to commercial power supply V, and connect pushbutton switch PB ₁ and its contact
Connect the normally open operation start pushbutton switch PB ₂ in parallel to a ₁ and in series to relay RLA to activate the relay.
By configuring a circuit that supplies power to RLA for a short time, it is possible to configure a circuit that self-maintains power supply to load R connected in parallel (or series) to relay RLA.

In order to provide such a circuit with a timer operation function for automatic power supply stop and automatic power supply start, a normally closed timer switch TS ₁ , which is an operation switch for motorized timer TM ₁ , is installed at the connection point between push button switch PB ₂ and relay RLA. -NC and a delay operation type switch _S1 that opens after a predetermined time after the start of power supply to the load R are inserted and connected, and a normally open timer switch TS1, which is the operation switch of timer _TM1 , is connected to the _NO switch with a delay. A recovery type relay RLC is connected. Also, relay
Between the connecting point of RLA and switch S ₁ and contact a ₁ , a parallel circuit consisting of normally open timer switch TS' ₁ , which is the operating switch of timer TM ₁ , and normally closed contact c ₁ of relay RLC is inserted and connected. , in this parallel circuit, the normally open contact A ₂ of relay RLA is connected in parallel to contact A ₁ and push button switch PB ₁ and in series to relay RLA via switch S ₁ , and relay RLC is connected in parallel to push button switch PB ₂ . The normally open contact _C2 is connected. C _p1 is a capacitor for delay recovery operation of relay RLC, and PB ₃ is a push button switch for canceling the timer set.

Furthermore, in addition to the above-mentioned timer, a timer switch is also provided to provide a timer operation function that only automatically stops power supply.
Motorized timer in series with TS′ ₁ and in parallel with contact c ₁
A timer switch TS ₂ , which is an operating switch for TM ₂ , is inserted and connected. This timer switch TS ₂ is a three-mode changeover switch, and is normally located at a position that connects the common terminal and terminal NC, but when the timer is set, it is switched to be connected to both terminal NC and terminal NO, and the set time elapses. Then it switches to the open state.

Figure 2 a, b, and c are timer switches, respectively.
₂ is a diagram showing the switching operation of the timer switch TS 2. This timer switch TS ₂ is provided with two stages of notches 10a and 10b in the rotary disk 10 driven by the timer TM ₂ .
When the contact piece 11 is connected to the common terminal in the figure, the contact piece 12 is connected to the terminal NC, and the contact piece 13 is connected to the terminal NO, and the outer periphery of the disk 10 is located at these contact positions, all the contacts are connected. When the pieces are connected (FIG. 2a) and the first notch 10a of the disc 10 is located, the contact pieces 11 and 12 are connected, and (FIG. 2b) the second notch 10b is located. All contact pieces are opened when positioned (Fig. 2c). Disk 1
0 is made to work in conjunction with a knob 14 provided on the device housing, and around this knob 14, a timer setting time or letters are attached, and the knob 14 is
The setting is done by turning clockwise in the figure. Then, when set as shown in Figure 2a,
The rotary disk 10 is driven counterclockwise in the drawing and opens as shown in FIG. 2c after the set time has elapsed.

Typically, the maximum set time by timer TM ₁ is 10
Several hours are sufficient, and the maximum setting time by timer _TM2 is approximately several hours.

To explain the circuit operation, to start power supply to load R, press pushbutton switch PB ₂ for a short time, and the relay will be activated via switch TS ₁ and switch S ₁ .
Contact a ₁ closes immediately after power is supplied to RLA, so even if push button switch PB ₂ is returned, power is not supplied to load R in the circuit of push button switch PB ₁ - contact a ₁ - contact c ₁ - relay RLA. Retained.

To stop power supply, press the switch after power supply starts.
If push button switch PB ₁ is pressed after S ₁ is opened, power supply to relay RLA is cut off and contact a ₁ is opened, so that self-holding is released and power supply to load R is cut off.

Next, a timer operation for supplying power to the load R or stopping the power supply after a desired time will be described. As with timer TM ₂ , the time of timer TM ₁ can also be set using a timer knob, and turning this timer knob switches timer switch TS ₁ to the NO side and also closes timer switch TS' ₁ . If the timer _TM1 is energized, it will return to its original state after the time set by the knob. Of course, the timer _TM1 is not limited to a motor type, but may be a mechanical type, and the same applies to the timer _TM2 .

When setting the start time of power supply to load R,
When the timer knob on the timer TM ₁ side is turned to set the desired time, the timer switch TS ₁ is switched to the NO side and the switch TS' ₁ is closed, but this alone does not mean that the timer operation has been set. Press pushbutton switch PB ₂ briefly to power relay RLC,
Close the contact c ₂ to connect relay RLC and timer.
Setup is performed only after power is maintained to _TM1 . And in this state, the timer switch TS ₁
is on the NO side, so power is not supplied to relay RLA, but timer switch TS ₁ is activated after the timer setting time.
When returning to the NC side, relay RLC is a delayed return type, so contact c ₂ , timer switch TS ₁ , switch
By supplying power to relay RLA via S ₁ and closing contacts a ₁ and a ₂ , even if contact c ₂ is opened, contact c ₁ remains
is closed, a self-holding circuit of relay RLA is formed, and power supply to load R is started.

On the other hand, when setting the power supply stop time while power is being supplied to the load R with switch _S1 open, contacts _a1 and _a2 are closed in the figure, and the timer knob on the timer _TM1 side is set. Turn the button to set the desired time and press the push button switch PB _2. As mentioned above, the timer switch TS ₁
switches to the NO side, timer switch _TS'1 closes, contact _c2 closes, and contact _c1 opens. Then, after the timer setting time, timer switch TS ₁ is activated.
When the switch returns to the NC side and the timer switch _TS'1 is opened, since the switch _S1 is open and the contact _c1 is also open, the self-holding of the relay RLA is released and the power supply to the load R is cut off.

In addition, in the case of setting only the timer TM ₁ side, the timer knob of the timer TM ₂ side is set at the position where the common terminal of the timer switch TS ₂ and the terminal NC are connected as shown in Fig. 2b, that is, the "continuous" position. is set to

The present invention further allows setting both the power supply stop time while power is being supplied to the load R with the switch _S1 open and the power supply restart time after the power supply is stopped, which will be described below.

In this case, turn the timer knob on the timer TM ₁ side to match the desired power supply restart time, turn the timer knob on the timer TM ₂ side to match the desired power supply stop time, and press push button switch PB ₂ . Timer switch TS ₁ , TS′ ₁ and relay RLC operate in the same manner as described above, and timer switch TS ₂ has a common terminal and terminal
Switch so that NC and NO are connected. Then, after the time set by timer TM ₂ , timer switch TS ₂ is opened, and at this time, switch S ₁ is of course closed.
Since _c1 is also open, the self-holding of relay RLA is released and power supply to load R is stopped. Furthermore, when the time set by the timer _TM1 has elapsed, the self-holding circuit of the relay RLA is formed and the power supply is restarted in the same manner as when power supply was started, except that the timer switch _TS2 is in the open state.

By the way, as mentioned above, simply turning the timer knob does not activate the timer circuit; returning the knob to its original position returns it to its original state. If push button switch PB ₂ is also pressed and set, pressing push button switch PB ₃ will cut off the power to relay RLC, closing contact c ₁ , opening contact c ₂ , and so on.
Timer _TM1 is de-energized and stops operating.
Thereafter, even if the time knob on the timer TM ₁ side is returned to its original position and the timer switches TS ₁ and TS' ₁ are reset, the energization state of the relay RLA will not change. For the timer TM ₂ side, press the push button switch.
If timer switch TS ₂ is returned to its original position after a short period of time from when PB ₃ is pressed until contact c ₁ closes, the timer switch can be activated even when power is being supplied.
The timer operation can be canceled regardless of whether TS ₂ is opened or closed, and there is no problem if the timer operation is continued. In this way, the timer set can be easily canceled regardless of whether it is set to start power supply or to stop power supply.

As described above, according to the present invention, it is possible not only to automatically start or stop power supply using a timer, but also to set both automatic power supply stop during power supply to load R and automatic power supply restart after stop.

FIG. 3 shows a circuit in which the present invention is applied to a combustion control circuit for a kerosene heater, and parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In Figure 3, TH is a temperature switch that turns on when the combustion section reaches a certain temperature or higher, and a relay RLB is connected in series to this switch TH.
A fan motor FM for blowing hot air is connected in parallel to the RLB. SL ₁ is a solenoid valve for small quantity fuel supply
SL ₂ is a solenoid valve for supplying large amounts of fuel, and both open when energized, and solenoid valve SL ₁ has a thermal power setting knob DY _1.
Solenoid valve SL ₂ is connected to terminal 3 via room temperature detection switch RS, terminal 2 is connected in series to solenoid valve SL ₂ , and terminal 3 and terminal 1 are connected to contact b ₁ of relay RLB. connected via. The common terminal of knob DY ₁ is connected to the connection point between time switch TS′ ₁ and relay RLA, and the push button switch
Power is supplied via PB ₁ - contact a ₁ - contact c ₁ . FH is an ignition heater, BM is a blower motor that blows combustion air, and these are powered by a self-holding circuit formed by relay RLD and its contact d ₂ , which is installed in parallel with the self-holding circuit formed by relay RLA. That is, ignition heater FH is connected to terminal NC of switching contact _b2 , which is the contact of relay RLB, and this is connected to terminal NO.
The blower motor BM is connected to _the common terminal _of contacts b ₂ until it switches to the terminal _{NC side, and the blower motor BM is connected to the common terminal of contacts d 2 -} when it switches to the terminal NC _side . Power is supplied via contact a ₂ and, when on the terminal NO side, via contacts d ₂ and d ₁ respectively. Power is supplied to the solenoid valves SL ₁ and SL ₂ , and to the ignition heater FH and blower motor BM using diodes connected in opposite directions with respect to the power supply point to relay RLA.
The relays RLA, RLB, and RLC are electrically separated by D ₁ and D ₂ , and therefore, DC type relays that operate at a half-wave of AC are used.

N _e1 to N _e3 are combustion status indicator lights that display the fire power status, LED ₁ and LED ₂ are timer set indicator lights, and S ₃ to _{S 6} are automatic return type abnormality detection switches that automatically extinguish the fire in an emergency. Earthquake detection switch, combustion section overheat detection switch, water detection switch in the fuel oil tank or piping, fuel oil tank oil level detection switch, LED ₃ , and LED ₄ are abnormality indicator lights that indicate these operations, respectively. .

To explain the circuit operation, when the relay RLA self-holds by pressing the push button switch PB ₂ , power is supplied to the solenoid valve SL ₁ with the knob DY ₁ in the "1" position (N _e
1 on), thereby supplying fuel to the combustion chamber. On the other hand, relay through contact a ₂ of relay RLA
Since RLD is also self-holding, contact d ₂ - contact a ₂ - contact b ₂
Power is applied to heater FH via
Power is supplied to the blower motor BM via S ₂ and contact b ₃ , and combustion air is sent to the combustion chamber. As a result,
Combustion begins.

After combustion starts, when the temperature of the combustion chamber reaches a predetermined temperature or higher, the temperature switch TH is turned on, and the fan motor FM operates to blow out hot air. After that, if you set the knob DY ₁ to the "2" position, only the solenoid valve SL ₂ will be supplied with power (N _e2 lights up), and combustion will occur with moderate heat, but if you set the knob DY 1 to the "3" position, the room temperature detection switch will be activated.
Since power is supplied to the solenoid valves SL ₁ and SL ₂ via RS and contact b ₁ , a large amount of fuel is supplied (N _e3 lights up) and heating operation begins. At this time, contact b ₂ is also switched to the NO side, and as a result, blower motor BM is supplied with power via contacts d ₂ and d ₁ of self-held relay RLD. When room temperature detection switch RS turns off as the indoor temperature rises, solenoid valve SL ₂ closes, so solenoid valve SL ₁
The combustion of only a small amount of fuel supplied by the switch continues (only N _e1 lights up), and when the room temperature detection switch RS is turned on due to a drop in the indoor temperature, the solenoid valve SL ₂ opens again and a large amount of fuel is supplied, reducing the indoor temperature. raise.
This operation continues thereafter.

Now, since this circuit is equipped with a self-holding switch circuit equipped with a timer as explained in Fig. 1,
During heating operation, by setting the timer knob on the timer TM ₁ side and pressing push button switch PB ₂ (LED ₂ lights up), combustion can be stopped after the set time, that is, the fire can be automatically extinguished. It becomes possible to go to bed while taking a bath. on the other hand,
When the timer knob on the timer TM ₁ side is set and push button switch PB ₂ is pressed while the heating operation is stopped (LED ₁
After the set time, the relay RLA can be energized and held by itself, so the combustor can start combustion after the set time, that is, it can be automatically ignited, so you can set the timer knob on the timer TM ₁ side before going to bed. By pressing the push button switch PB ₂ , you can automatically ignite it in the morning before you wake up. Now, with conventional timer circuits, you can only set one of these settings, so if you set it to automatically ignite, you would have to extinguish it just before you go to bed, and if you set it to automatically extinguish it, it will turn on when you wake up in the morning. The ignition operation must be carried out.

On the other hand, according to the present invention, timer TM ₂
Automatic extinguishing set by Timer TM ₁ and automatic re-ignition set by Timer TM 1 can be performed at the same time. For example, during combustion, set the timer knob on the Timer TM ₂ side to 1 hour, and set the timer knob on the Timer TM ₁ side to 9 hours. Once set, even if you go to bed immediately afterwards, the heating operation will continue (any one of N _e1 to N _e3 and LED ₂ will turn on) until one hour has passed after setting, and after one hour, the heating will automatically turn off (LED ₁ will turn on). only) and
Automatic re-ignition 9 hours after setting (N _e1 ~ _{N e3}
(only one of them lights up). In this way, automatic extinguishing after going to bed and automatic ignition before waking up in the morning are possible, which eliminates the above-mentioned inconvenience.

In addition, in this circuit, relay RLC is connected via abnormality detection switches S ₃ to _{S 6} , so if any of these operates while you are sleeping, for example, it will simply make relay RLA unable to maintain itself. Not, but
The timer operation can also be reset in the same way as when reset by push button switch _PB3 .

As explained above, according to the present invention, it is possible to control not only the on or off operation of a self-holding switch circuit after a predetermined time, but also the off operation after a predetermined time and the subsequent re-on operation. It is ideal as a power switch circuit for household warm air heaters and air conditioners.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the self-holding switch circuit according to the present invention, Figs. 2 a, b, and c respectively show the operating states of the timer switch TS ₂ used therein, and Fig. 3 shows an embodiment of the self-holding switch circuit according to the present invention. FIG. 2 is a circuit diagram showing the application of the present invention to a combustion control circuit of a kerosene heater. In the diagram, RLA, RLB, RLC, and RLD are relays,
TM ₁ , TM ₂ are timers, PB ₁ , PB ₂ , PB ₃ are push button switches, R is load, TS ₁ , TS' ₁ , TS ₂ are timer switches, TH is temperature switch, FM is fan motor, DY ₁ is Firepower setting knob, RS is room temperature detection switch, SL ₁ and SL ₂ are solenoid valves, FH is ignition heater,
BM is a blower motor, 10 is a rotating disk, 11,1
2 and 13 are contact pieces, and 14 is a knob.

Claims (1)

[Scope of utility model registration request] a first relay RLA, a first normally open contact _a1 of the relay RLA and a first normally closed pushbutton switch;
A normally open second push button switch PB ₂ is connected in parallel with PB ₁ and in series with the relay RLA, and the operation of the push button switches PB ₁ and PB ₂ connects the relay RLA in series or in parallel. A self-holding switch circuit configured to open and close power supply to a connected load includes a first timer TM ₁ and a second timer TM ₂ , and is connected to the push button switch PB ₂ and a relay.
A first normally closed timer switch TS ₁ -NC, which is the operating switch of the timer TM ₁ , is connected to the connection point with RLA.
and a delay action switch _S1 that opens after power is supplied to the load, and are connected in parallel to the push button switch _PB1 and the contact _a1 , and in series with the relay RLA via the delay action switch _S1 . A second normally open contact a2 of the relay RLA is connected to the push button switch _PB2 , and a second normally open timer switch _TS1- , which is the operating switch of the timer _TM1 , is connected in series to the push button switch _PB2 .
A series circuit of NO and a delay recovery type second relay RLC is connected, and the timer _TM1 is connected between the connection point of the relay RLA and the delay operation switch _S1 and the contact point _A1 .
the third normally open timer switch TS′ ₁ which is the operating switch of the relay RLC; and the first normally closed contact c ₁ of the relay RLC.
Insert and connect the parallel circuit with the timer switch.
A first normally closed timer switch TS ₂ , which is an operating switch for the timer TM ₂ , is connected in series with TS′ ₁ and in parallel with the contact c ₁ , and the push button switch
The second normally open contact of said relay RLC in parallel to PB ₂
A self-holding switch circuit with a built-in timer, characterized in that by connecting _c2 , a timer can be set for automatic power supply stop and automatic power supply restart after the stop.