JPS6226685Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a main controller that performs control operations for combustion preparation and operations that generate switching signals for switching the calorific value during combustion into multiple stages.
Connect the relay terminal board via the remote cable,
Furthermore, it relates to a combustion safety control device for a water heater with capacity switching in which a flow controller is connected to this relay terminal board via another remote cable, and a two-circuit rotary switch is installed as a capacity switching switch installed in the main controller and flow controller. By using this function, it is possible to give priority to the capacity switching operation on the flow controller side over that on the main controller side, and to use a simple wiring circuit to display the function of indicating by a lamp the state in which capacity switching operation is possible on the main controller side. The purpose of this project is to provide a combustion safety control device with a high level of safety.

In order to achieve the above-mentioned purpose, this invention
As shown in the figure, the base of a switching transistor Q1 provided in the main controller MC is connected to the power supply via a resistor R2, and a water flow switch S4 provided in the relay terminal board CP is connected to the connection point between the resistor R2 and the base. and the flow switch S5 connected in parallel with this water flow switch S4 and the flow side relay.
A series circuit with AK2 is provided in the flow controller FC, and the main valve V7 provided in the relay terminal board CP is connected to the normally open contact K1A of the first relay of the main controller MC, and the normally open contact K1 of the first relay is connected to the normally open contact K1A of the first relay of the main controller MC.
The normally open contact K2A of the second relay in series with A is connected to one end of the small valve V1 provided on the relay terminal board CP, the other end of the small valve is connected to the power supply side of the water flow switch S4, and the relay terminal The flow valve V4 provided on the panel CP is connected to the power supply side of the small valve V1 via the normally open contact AK2a of the flow side relay provided on the flow controller FC, and the relay side relay K3 is connected to the power supply side of the small valve. The igniter V5 and the pilot valve V6 are connected in parallel with the main valve V7 through the normally closed contact K3A of the relay side relay K3, and the interlocking first and second valves provided in the main controller MC are
The movable contacts of the rotary switches S2 and S3 are connected to the connection path between the normally open contact K2A of the second relay and the small valve V1, and the fixed contacts "medium" and "large" of the first rotary switch S2 are connected in common. The interlocking third and fourth parts provided in the flow controller FC
Connect the fixed contact "OFF" of the third rotary switch S6 of the rotary switches S6 and S7, and connect the fixed contact "large" of the second rotary switch S3 to the fixed contact "OFF" of the fourth rotary switch S7. and connect the fixed contacts "large" and "medium" of the third rotary switch S6 and the fixed contact "large" of the fourth rotary switch S7 to the power supply side of the normally open contact AK2a of the flow side relay. The movable contact of the third rotary switch S6 is connected to a medium capacity valve V2 provided on the relay terminal board CP, and the movable contact of the fourth rotary switch S7 is connected to a high capacity valve V2 provided on the relay terminal board CP. The base of a switching transistor connected to the valve V3 and connected in series with the capacity switchable display lamp L3 provided on the main controller MC is connected to the fixed contact "OFF" of the fourth rotary switch. In addition, in the figure,
RS is a reset switch, and AK2a is a self-holding contact of relay AK.

In the above configuration, when either water flow switch S4 or flow switch S5 is closed, switching transistor Q1 in main controller MC becomes conductive and generates a combustion sequence start signal. The combustion sequence is started based on this start signal, and first, when the first relay contact K1A is closed, the main valve V7, the igniter V5, and the pilot valve V6 are operated.

Then, the combustion sequence progresses normally and the second
When the relay contact K2A is closed, the small valve V1 is operated when the water flow switch S4 is closed, and the flow valve V4 is operated when the water flow switch S5 is closed, and both switches are closed. S4, S5
When the valve V1 and the flow valve V4 are closed, the small valve V1 and the flow valve V4 operate simultaneously. At this time, the relay side relay K3 is activated, and the igniter V5 and pilot valve V6 are deactivated.

If you want to change the hot water temperature on the main controller MC side, turn the possible contacts of the third and fourth rotary switches S6 and S7 on the flow controller FC side to the fixed contact "OFF" position. As a result of this turning on, a lighting signal path is formed via the fourth rotary switch S7, and the capacity switchable display lamp L3 is lit.Seeing this lighting, the first and second rotary switches S2, By switching S3 to the fixed contact "medium" or "large", only the capacity valve V2 or capacity valves V2 and V3 can be activated.
can be operated simultaneously.

In addition, if you want to change the hot water temperature on the flow controller FC side, the third and fourth rotary switches S6 and S7 should be changed regardless of the switching positions of the first and second rotary switches S2 and S3 on the main controller MC side. By setting the movable position of the fixed contact "medium" and "large", the capacity valve V2
only, or capacity valves V2 and V3 can be operated simultaneously. In other words, the water supply temperature can be controlled on the flow controller side with priority over the main controller side.

Small valve V1 installed on relay terminal board CP as above
By making it possible to control the flow valve V4 and the flow valve V4 separately and independently using the water flow switch S4 provided on the relay terminal board and the flow switch S5 provided on the flow controller FC, extremely high safety can be obtained. In addition, the water supply temperature can be controlled on the flow controller side with priority over the main controller side, so in conjunction with the above points, safety is improved, and a rotary switch that controls the hot water temperature on the flow controller side is used. Since the main controller side is configured to form a signal path for lighting a lamp indicating that the hot water temperature can be controlled, the circuit configuration is greatly simplified and reliability is improved.

Next, an embodiment of this invention will be described with reference to the drawings. In the figure, the main controller
MC determines the operating procedure of the combustion safety control device.
LSI element U2 and IC that forms the main part of fire detection section FD
When the power switch S1 is turned on, the DC voltage that has passed through the transformer T and the rectifier D1 is supplied to each part as a control circuit power source, and the power supply is confirmed by lighting the power lamp L1.

Q1, Q2, Q3, and Q4 are switching transistors, and when transistor Q3 is turned on, combustion lamp L2 is turned on via diode D15. Interlocking second capacity changeover switch S
6. By setting S7 to the OFF position, a current flows through the large capacity valve V3 and the resistor R1, thereby turning on the switching transistor Q4.
Switching lamp L3 that is ON and connected to the load side
lights up. The magnitude of the current at this time is such that the magnitude of the resistor R1 is set so that the large capacity valve V3 does not operate.

K1 and K2 are relays driven by the control signal of the LSI element U2, C is a capacitor, R is a resistive element, and D is a diode element. Furthermore, the relay terminal board CP is connected to the main controller MC, which is constituted by the above-mentioned respective elements, by a first remote cable RC1 with wire numbers 1 to 8 attached thereto.

This relay terminal board CP has small, medium, and large capacity valves required to selectively operate multiple burners.
1, V2, V3, flow valve V4, main valve V7, water flow switch S4, etc., and from this relay terminal board CP, the flow controller FC is further connected by a multi-core second remote cable RC2. It is connected.

This Flo Controller FC is Flo Switch S
5 is a relay AK1 operated thereby;
AK2 (shown as one relay AK in FIG. 1) and a fluoramp L4 are connected in parallel.

Further, L5 is a power lamp, which is connected in parallel with the power lamp L1 in the main controller MC,
Power-on confirmation can also be performed on the flow controller FC side. Also, S2, S3
S6 and S7 are first ability changeover switches consisting of two-contact rotary switches for two circuits, and second ability changeover switches S6 and S7 are four-contact rotary switches for two circuits.

When the power switch S1 is turned on in the combustion safety control device configured in this way, the transformer T is energized, and its output side DC power is supplied to the LSI element U.
2, the IC element U1, etc. are supplied with control power, and the power lamp L1 and the flow power lamp L5 are turned on. The switching lamp L3 is a flow switch S6, S7
Lights up when is in the "on" position.

In addition, the power lamp L5 of the flow is connected to the power supply via the resistor R2, and is also connected to the base of the transistor Q1, but the resistor R2 and select the value of R92. Therefore, transistor Q1 is kept in an OFF state.

Here, by flowing water to the flow, the water flow switch S
When transistor Q4 is turned on or when the float switch S5 is turned on manually, the current flowing through the resistor R2 increases, so that the potential difference between the base and emitter increases, and the transistor Q1 turns on. That is, when the flow switch S5 is turned on, relays AK1 and
Fluoramp L4 because AK2 turns on at the same time
The lamp also lights up, and the combustion operation of the fluoro pot starts.

The operation sequence is that transistor Q1
By inverting to ON, the transistor Q3 connected to the next stage is switched ON, and at the same time, the resistor R
The sequence is automatically started by transmitting the divided voltage signals of 7 and R8 as a start signal to the No. 18A pin of LSI element U2.

The next sequence of operations is pre-purge of the combustion device.If this pre-purge operation is the first sequence, the second sequence operation is that relay K1 turns on, main valve V7 opens, and igniter V5 and pilot valve V6 turn on to ignite. It is started by performing an action.

When ignition occurs, the flame detector FD immediately detects this, and when this ignition detection command is transmitted to the No. 24A pin of LSI element U2, the No. 24A pin of LSI element U2.
An output signal appears from the 10A pin and connects relay K2.
At the same time as switching to ON, the No. 2A pin turns ON,
Resistor R18, diode D15, transistor Q
3, the combustion lamp L2 is turned on. In addition, when relay contacts K1A and K2A are switched, relay K3 is turned on, and when relay contact K3A is turned off, igniter V5 and sub-pilot valve V6, which are activated to ignite the pilot flame, are turned off.

Due to the ON operation of transistor Q3, transistor Q2 also turns ON, and the resistor R connected to it turns ON.
A charging current flows to the capacitor C1 through the capacitor C1. The charging time of the capacitor C1 determines the timing of the past pilot described later.

Therefore, as mentioned above, when the flame detector FD is activated and the relay K2 is energized, its a contact K2A is switched, and the small capacity V1 and the second remote cable are connected through the No. 5 terminal of the first remote cable RC1.
Power is supplied to the flow controller FC via the No. 2' terminal of RC2.

However, when Floss Switch S5 is turned on, the relay
AK1 operates and forms a self-holding circuit, and relay AK2 short-circuits between terminals No. 2' and No. 7' of the second remote cable RC2, so the flow valve V
4 turns on.

On the other hand, when water flow switch S4 turns on, transistor Q1 turns on, so No. 18A of LSI element U2 turns on.
Power is supplied to the small capacity valve V1 in the order of operation of pin, 7A pin, 24A pin, 10A pin, and relay contacts K1A and K2A, and since water flow switch S4 is ON, the current exceeds the limit by resistor R1. A current flows, and the small capacity V1 is energized.
Of course, even if the flow switch S5 and the water flow switch S4 are turned on at the same time, the above operation is performed in the same way.

Next, when it is desired to change the hot water temperature, the capacity changeover switches S2, S3 and S6, S7 are switched.
This ability switching is done by S6 in the flow controller FC.
It is possible to switch between S7 and any of S2 and S3 in the main controller MC, but when the capacity changeover switches S6 and S7 are in use, switching with the capacity changeover switches S2 and S3 is impossible.
The capacity changeover switches S6 and S7 have operational priority over the capacity changeover switches S2 and S3.

In other words, when switching the capacity with switches S2 and S3 on the main controller MC side, turn off switches S6 and S7 on the flow controller FC side.
It is necessary to keep it in this position. In this state, the tri-registor Q4 is turned on with its base connected to the ground side through the "off" contact of the switch S7, the large-capacity valve V3, and the resistor R1, and its load, the switching lamp L3, lights up. Displays that ability switching is possible on the main controller MC side. Switches S2 and S3 that interlock here
When rotated by one step, contacts K1A, K2A,
Operating current flows through switch S2 and the "off" contact of switch S6 to medium capacity valve V6, resulting in a medium capacity condition.

Next, when switches S2 and S3 are rotated to the second stage, medium capacity valve V2 remains operated in the above system, and large capacity valve V3 is also operated through the "off" contacts of switch S3 and switch S7. Current flows and the state becomes high capacity.

On the other hand, when the capacity changeover switches S6 and S7 on the flow controller FC side are rotated by one step, the connections between switches S2 and S3 and valves V2 and V3 are cut off, so the capacity changeover by switches S2 and S3 is not possible. The switching lamp L3 goes out. In this state, an operating current flows through the contacts K1A and K2A to the small capacity valve V1.

Next, when switches S6 and S7 are rotated to the second stage, contacts K1A and K2A and switch S
Operating current is supplied to the medium capacity valve V2 through 6,
When the valve is rotated to the third stage, the operating current also flows through the switch S7 to the large capacity valve V3 while keeping the medium capacity valve V2 operating.

In addition, water flow switch S4 and flow switch S
When both transistors 5 turn OFF, transistors Q1, Q2, and Q3 also turn OFF, but the ON signal continues to be supplied to the No. 18A pin of LSI element U2 for a predetermined period of time due to the charge in capacitor C1. Valve V4, small, medium, and large capacity valves V1, V2, and V3 are
However, only the main valve V7 continues to operate as ON due to continued energization of relay K1, resulting in a so-called post-pilot state.

At this time, terminal No. 2A is outputting voltage, but since transistor Q3 is turned off, combustion lamp L2 is turned off. If the flow switch S5 or the water flow switch S4 is turned ON again during this post-pilot timing, the flow valve V is immediately turned on without going through the timing of the pre-purge and ignition operations.
4. Since the small capacity valve V1 etc. can be turned on, it has the effect of reducing changes in hot water temperature caused by sudden opening and closing of the hot water tap. When the post-pilot timing has elapsed, the device returns to the power-on state and enters the standby state.

As described above, according to this invention, the hot water supply valve provided on the relay terminal board is opened and closed by the water flow switch S4, and the flow valve V4 provided on the relay terminal board is opened and closed by the flow switch S5 provided on the flow controller. Since they are controlled independently from each other, extremely high safety can be achieved. In addition, as capacity changeover switches provided on the main controller MC side and the flow controller FC side, rotary switches S2, S3 and S6, S7 each have two circuits.
One switch S2, S6 is used for medium capacity, and the other switch S3, S7 is used for high capacity. Since the large capacity switch S7 is used as part of the signal path for lighting the switching lamp L3 to indicate the state in which capacity switching can be performed on the main controller MC side, the circuit configuration is significantly reduced. This simplifies the process and provides significant benefits in terms of reliability and cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main part of this invention, and FIG. 2 is a circuit diagram of a combustion safety control device according to an embodiment of this invention. MC...Main controller, FC...Flow controller, CP...Relay terminal board, U1...IC element, U2...LSI element, FC...Flame detection section, RC
1, RC2...Remote cable, L1...Power lamp, L2...Combustion lamp, L3...Switching lamp, L4...Fluor lamp, L5...Power lamp,
AK, AK1, AK2...Relay, S2, S3, S
6, S7... Capacity changeover switch.

Claims (1)

[Scope of utility model registration request] Connect the base of the switching transistor provided in the main controller to the power supply via a resistor,
A water flow switch provided on a relay terminal board is connected to the connection point between the resistor and the base, and a series circuit of a flow switch connected in parallel with this water flow switch and a flow side relay is provided in the flow controller, and the first A main valve provided on the relay terminal board is connected to a normally open contact of the relay, and a normally open contact of a second relay in series with the normally open contact of the first relay is connected to one end of the small valve provided on the relay terminal board. The other end of the small valve is connected to the power supply side of the water flow switch, and the flow valve provided on the relay terminal board is connected to the power supply of the small valve via the normally open contact of the flow side relay provided on the flow controller. A relay side relay is connected to the power supply side of the small valve, and an igniter and a pilot valve are connected in parallel to the main valve through the normally closed contact of this relay side relay, and the main controller is provided with Connect the movable contacts of the first and second rotary switches that are interlocked to the normally open contact of the second relay and the connection path of the small valve, and connect the fixed contacts "medium" and "large" of the first rotary switch. A fixed contact "OFF" of the third rotary switch of the interlocking third and fourth rotary switches provided in the flow controller is connected in common, and a fixed contact "large" of the second rotary switch is connected to the fixed contact "OFF" of the third rotary switch. Connect to the fixed contact “OFF” of the rotary switch No. 4, and connect the fixed contact “L” of the third rotary switch.
"Medium" and the fixed contact "Large" of the fourth rotary switch are connected to the power supply side of the normally open contact of the flow side relay, and the movable contact of the third rotary switch is connected to the middle contact provided on the relay terminal board. A switch transistor is connected to the capacity valve, the movable contact of the fourth rotary switch on the front track is connected to the large capacity valve provided on the relay terminal board, and the switch transistor is connected in series to the capacity switchable indicator lamp provided on the main controller. A combustion safety control device characterized in that a base is connected to a fixed contact "OFF" of the fourth rotary switch.