KR0181629B1 - Function monitoring device - Google Patents

Abstract

The present invention relates to an inexpensive functional monitoring device capable of checking a function of various solenoid valve systems, wherein the function confirmation unit 420 includes an instruction to send the energization time signals 411, 412, and 413 by the solenoid valve control unit 410, and a photo coupler circuit. On the basis of the output 80 outputted by (8), the relay contacts (511, 521, 531) are defective, the connectors 211, 221, 261 are misaligned with the board side connectors (41, 42, 43), or the contact is poor, the original solenoid valve ( 21), the kettle valve 22 and the switching valve 26 are inspected for disconnection.

In a hot water heater for reducing the amount of water flowing into the bypass pipe when the tapping temperature does not reach the set temperature even when the burner is burned at the maximum allowed combustion amount of the burner, the water heater is capable of preventing the occurrence of drainage. 21) the combustion control means for controlling the combustion of the burner 4 so that the detected tapping temperature according to 21) matches the set temperature, and when the tapping temperature does not reach the set temperature even when the burner 4 burns at the maximum allowable combustion amount In a hot water heater equipped with water quantity control means for reducing the quantity of the bypass pipe 12 by inserting the quantity control device 13 while keeping the quantity of the engine 10 constant, the drain generation of the heat exchanger 17 is controlled. The amount of water in the bypass pipe 12 is monitored by the tapping temperature detected by the subsidiary body thermistor 19 of FIG. The increase is made to prevent drainage.

Description

Function monitoring device

1 is a block diagram of a hot water heater according to an embodiment of the present invention

2 is an electric circuit diagram of a solenoid valve function monitoring device attached to a hot water heater.

3 is an electric circuit diagram of a solenoid valve function monitoring apparatus according to the prior art.

4 is an electric circuit diagram of a solenoid valve function monitoring device related to a prototype.

* Explanation of symbols for main parts of the drawings

5: solenoid valve circuit 7: power supply (DC power supply)

8 photocoupler circuit 21 original solenoid valve

22: kettle valve (magnetic valve) 26: switching solenoid valve (magnetic valve)

41 substrate side connector 42 substrate side connector

43: board side connector 51: relay circuit (control switch)

52: relay circuit (control switch) 53: relay circuit (control switch)

211 connector 221 connector

261 connector 400: microcomputer

410: solenoid valve control unit (magnetic valve control means)

420: function check unit (function check means)

The present invention relates to a function monitoring device for monitoring the function of the solenoid valve system.

For example, in a hot water heater, a plurality of solenoid valves are provided in a gas supply path to a burner, and electricity is supplied to these solenoid valves to supply gas. In the related art, the function of the solenoid valve system is monitored by the function monitoring device J shown in FIG.

The function monitoring device J closes when the board side connector 921-923 inserted with the connector 914-916 connecting the solenoid valves 911-913 and the energization signal 931-933 are sent out. The relay contacts 941-943 are connected in series with the output terminal of the bridge diode 950.

Relays 971 which connect the light emitting portions 961-963 of the photocoupler to both ends of the substrate side connectors 921-923 and have relay contacts 941-943 in the relay driver circuit 930. -973).

The solenoid valve control unit 981 for instructing the energization time signal 931-933 to be sent to the relay drive circuit 930 and the output signal 994-996 of the light receiving unit 991-993 of the photo coupler. A microcomputer 980 having a function confirmation unit 982 for inspecting the function of the valve system is provided.

However, although the conventional function monitoring device J can detect the failure of the relays 971-973 (the malfunction of the relay contacts 941-943), the connector that connected the electric valves 911-913 by cable ( 914-916 and the board | substrate side connector 921-923 have a problem that a misalignment, a connection failure, and disconnection of the solenoid valves 911-913 cannot be detected.

In other words, even when the connectors are misaligned, a poor contact or disconnection of the valve coil occurs, when the relay contacts 941-943 are closed, a voltage is generated between the terminals of the connectors 921-923, resulting in an output signal 994-996. This is because the function confirmation unit 982 determines that the function of the solenoid valve system is normal.

Therefore, the present inventors started and examined the function monitoring apparatus K shown in FIG.

The function monitoring device (K) is closed when the board side connector (921-923) inserted with the connector (914-916) connecting the solenoid valve (911-913) is connected, and the energization signal (931-933) is sent out. The relay contacts 941-943 are connected in series, and are connected in series with the output terminal of the bridge diode 950 via a resistor 965 for current detection.

The light emitters 960 of the photocoupler are connected to both ends of the resistor 965, and a relay 971-973 having a relay contact 941-943 is connected to the relay driver circuit 930.

The function of the solenoid valve system based on the solenoid valve control unit 981 which instructs the energization time signal 931-933 to be sent to the relay drive circuit 930 and the output signal 900 of the light receiving unit 990 of the photocoupler. And a microcomputer 980 having a function checking unit 982 for inspecting.

In addition to the failure of the relays 971-973 (the malfunction of the relay contacts 941-943), the functional monitoring device K can also detect misalignment of the connectors, contact failure, disconnection of the valve coil, and the like. However, the disadvantages described below have been manifested.

Since the total of the currents flowing through the respective solenoid valves 911-913 flows through the resistor 965, the resistor 965 needs to use a large component with a large withstand power. When there are a plurality of solenoid valves, the voltage at both ends of the resistor 965 varies depending on the number of the solenoid valves being energized, and the light emitting unit 960 is likely to be deteriorated. This is because the resistance value of the resistor 965 is set so that the output signal 900 is sent out even when energizing one solenoid valve, so that the voltage across the resistor 965 becomes too high when all the solenoid valves are energized.

A first object of the present invention is to provide an inexpensive functional monitoring apparatus capable of checking the functions of various solenoid valve systems.

A second object of the present invention is to provide a function monitoring device having excellent durability by checking the function of a solenoid valve circuit having a plurality of solenoid valves.

In order to solve the said subject, this invention employ | adopted the following structures.

(1) Connect the board-side connector into which the connector connecting the solenoid valve is inserted, and the diode of the control switch closed by the input of the signal during energization. And a microcomputer having a solenoid valve control means and a function checking means for checking the function of the solenoid valve system on the basis of the sending instruction of the energizing signal and the presence or absence of forward voltage generated between both ends of the diode.

(2) A series of solenoid valve circuits connected in series with a board-side connector into which a connector connecting a solenoid valve cable is fitted, and a control switch closed by input of a signal when energizing, and a diode connected in series A solenoid valve control means connected to a power supply and individually instructing each control switch to send out a signal during energization, and a solenoid valve system based on the presence or absence of forward voltage generated between the instruction to send the signal during energization and the diode. A microcomputer having a function checking means for checking a function of the device is provided.

(3) When the forward voltage is detected before having the configuration of (1)-(2) described above, the power supply time signal is sent out, the function checking means determines that the control switch is ON.

(4) When the forward voltage is not detected when the transmission signal is sent out when the above (1) to (3) is configured, the OFF switch of the control switch, a bad connector connection, or a cable disconnection Or the function checking means determines that at least one of the solenoid valve failures has occurred.

(5) With the configuration of (1) to (4), the function checking means detects the forward voltage by a photo coupler circuit.

The above ON or OFF failure of the control switch includes a drive part of the control switch.

According to claim 1, when the solenoid valve control means does not instruct the signal to be delivered, the control switch is in the open state. No current flows through the solenoid valve, and no forward voltage is generated at both ends of the diode. Do not.

When the solenoid valve control means instructs the transmission of the signal at the time of energization, the control switch is closed, a current flows through the solenoid valve, and forward voltage is generated at both ends of the diode.

The function checking means is based on the command to send a signal when the solenoid valve control means is energized and the presence or absence of forward voltage generated at both ends of the diode. , Disconnection of solenoid valve is detected.

Regarding claim 2

In the state where the solenoid valve control means does not instruct the energization signal to be sent, all the control switches are in an open state, and no current flows through any of the solenoid valves, so that no forward voltage is generated across the diode.

When the solenoid valve control means instructs the transmission of the signal at the time of energization, the corresponding control switch is closed, a current flows through the corresponding solenoid valve, and a substantially constant forward voltage is generated at both ends of the diode.

The function confirming means is a failure of a corresponding control switch or a misalignment of a corresponding connector based on an instruction to send a signal during energization to a predetermined solenoid valve by the solenoid valve control means and the presence or absence of forward voltage at both ends of the diode. Or contact failure, disconnection of the corresponding cable, disconnection of the corresponding solenoid valve, or the like.

According to claim 3, since the control switch is in a closed state when the solenoid valve control means does not instruct the sending of the signal during energization, any control switch is in the open state; In the case of claim 2, no current flows through the solenoid valve (no current flows through any solenoid valve), and no forward voltage is generated across the diode.

However, if the control switch is ON (at least one control switch is ON), current flows in the solenoid valve (current flows in the corresponding solenoid valve), and forward voltage is generated at both ends of the diode. The function checking means determines that the control switch (at least one control switch) is ON.

In accordance with claim 4, when the solenoid valve control means sends out a signal for energizing {the control switch to be checked, the signal for energizing}, the control switch {corresponding control switch} is closed. Current flows through the solenoid valve (corresponding solenoid valve), and forward voltage is generated at both ends of the diode.

However, at least one of OFF switch failure, connector connection failure, cable disconnection, solenoid valve failure {control switch OFF failure, connector connection failure corresponding to the corresponding control switch, cable disconnection, solenoid valve failure} In this case, even when the solenoid valve control means sends out a signal for energizing {the signal for controlling the switch to be inspected when energizing,} no current flows to the solenoid valve {corresponding solenoid valve], and forward voltage is applied to both ends of the diode. This does not happen.

In such a case, the function checking means includes a failure of the control switch, a bad connector connection, a cable disconnection, a solenoid valve failure (a faulty connection of the connector corresponding to the OFF control switch, a control switch to be inspected, a broken wire, It is determined that at least one of the solenoid valves has failed.

In accordance with claim 5, the function checking means detects the forward voltage generated at both ends of the diode via the photo coupler circuit.

In accordance with claim 1, a function check such as a failure of a control switch, a misalignment between a connector and a board side connector, a poor contact, a failure of a solenoid valve, and the like can be performed.

Since the solenoid valve current flows by the forward voltage of the diode, it is cheaper, generates less heat, and saves space compared to using a resistor.

According to claim 2, in a solenoid valve circuit having a plurality of solenoid valves, a function check such as a failure of a control switch, a misalignment between a connector and a board side connector, a poor contact, a failure of a solenoid valve, and the like. Can be performed for each solenoid valve.

In the solenoid valve circuit having a plurality of solenoid valves, even if there are a plurality of solenoid valves to be energized, the forward voltage is substantially the same, so that the function checking means is not burdened and the durability is excellent.

According to claim 3, it is possible to detect an ON failure of a control switch (several control switches).

According to claim 4, the OFF switch of the control switch, the connector connection failure, the cable disconnection, the solenoid valve failure, the OFF switch of the control switch corresponding to the control switch to be inspected, the connector connection failure, the cable disconnection, During a solenoid valve failure, it is possible to detect at least which side has occurred and has not occurred.

With regard to claim 5,

Even if the cathode side of the diode is a circuit configuration (for example, an alternating current circuit) not electrically connected to the ground point of the microcomputer, it can be transmitted to the function confirming means by using a photo coupler that a forward voltage is generated.

An embodiment of the present invention (corresponding to ranges 1 to 5 of the patent jack phrase) will be described based on FIG. 1 and FIG.

The gas water heater U with the solenoid valve function monitoring device A includes a combustor 10, a gas pipe 20, a water pipe 30, and a control device 40.

The combustor 10 has the burner group 11 formed in the hot water heater case 100 and the combustion fan 12 which supplies combustion air to the burner group 11, and the gas blown out from the nozzle 13 is combustion air. Combustion occurs, and exhaust gas is discharged from the exhaust port 14.

The burner group 11 which heats the heat exchanger tube 33 mentioned later is a double burner which arranged several ribbon burners in two rows, and the ignition electrode 15 for igniting near the burner group 11 is ignited. A flame rod 16 and a thermocouple (not shown) for combustion detection are formed.

The gas pipe 20 is for supplying gas to the nozzle 13, and in turn, the original solenoid valve 21, the kettle valve 22, and the proportional solenoid valve 23 are disposed upstream. have. The gas pipe 20 is branched into one gas pipe 24 and the other gas pipe 25 in order to supply gas to each burner group 11 of the double burner downstream of the proportional solenoid valve 23. In the gas pipe 24, a switching valve 26 for switching the combustion state (ON or OFF) on one side of the burner group 11 is searched.

The water pipe 30 is located between the water supply pipe 31 connected to the water supply source (not shown), the hot water supply pipe 32 connected to the hot water supply port (not shown), and the water supply pipe 31-the hot water supply pipe 32. It consists of a heat exchange tube (33).

A water supply control valve 311, a water flow sensor 312, and a water inlet temperature thermistor (not shown) are formed in the water supply pipe 31, and a tapping temperature thermistor 321 is formed in the hot water supply pipe 32. .

The control device 40 having the microcomputer 400 receives input signals such as a controller 401, a water flow sensor 312, an inlet temperature thermistor, a flame rod 16, and a thermocouple. On the basis of the output signal, the microcomputer 400 of the control device 40 includes an original solenoid valve 21, a kettle valve 22, a proportional solenoid valve 23, a switching valve 26, a combustion fan ( 12), the ignition electrode 15, and the quantity control valve 311 are controlled.

In this embodiment, the solenoid valve function monitoring device A has the following configuration. (See Fig. 2).

The series connection of the solenoid valve circuit 5 and the diodes 6, 6, 6 is connected to the power supply 7, and the terminal voltages of the diodes 6, 6, 6 are detected via the photo coupler circuit 8. The microcomputer 400 includes a solenoid valve control unit 410 and a function confirmation unit 420.

The solenoid valve control unit 410 sends out the energization time signal 411-413 to the relay circuits 51-53.

The function confirmation unit 420 has a contact failure (relay contact point) based on the transmission instruction of the energization time signal 411-413 by the solenoid valve control unit 410 and the output 80 which the photo coupler circuit 8 sends out. (511,521,531)}, misalignment or poor contact between connectors {connectors 211, 221, 261 and board side connectors 41-43}, cable breaks, and coil breaks {original solenoid valve 21, kettle valve 22, Check valve 26).

The solenoid valve circuit 5 includes a substrate side connector 41-43 fitted with connectors 211, 221, and 261 which cable-connect the original solenoid valve 21, the kettle valve 22, and the switching valve 26, and a signal for energizing the battery. The parallel connection of the relay contacts 511, 521, and 531 which are closed by the input to the relay circuits 51-53 of (441-413) is performed in parallel.

The relay circuits 51-53 are constituted by relays 510, 520, 530 having relay contacts 511, 521, 531 which are always open, transistors 512, 522, 532, etc. which are conducted by input of the energizing signals 411-413.

The diodes 6, 6 and 6 are connected in series by three silicon diodes. When at least one of the relay contacts 511, 521 and 531 is closed, the forward voltage at both ends is about 0.6x3 = about 1.8V. In addition, both ends of the diodes 6, 6, 6 are connected in parallel with a capacitor 61 and a series circuit composed of the light emitting portions of the resistor 9 and the photo coupler 81, respectively.

The power source 7 is constituted by a silicon bridge 71 for rectifying alternating current.

The photo coupler circuit 8 detects whether the forward voltage is generated at both ends of the diodes 6, 6, and 6 by the photo coupler 81, and inputs the output 80 to the microcomputer 400. Doing.

The following describes the operation of the solenoid valve function monitoring device (A).

Initial check before starting combustion operation

When the operation switch (not shown) is turned ON, the function confirmation unit 420 performs the "initial check before the start of combustion operation" shown below, and the initial check error (when an abnormality is detected). While the initial check error is displayed, the operation is stopped without performing the next operation.

In the state where the solenoid valve control unit 410 does not instruct the transmission of the energizing signals 411 to 413, the function confirming unit 420 determines whether or not the output 80 is detected, thereby causing a contact ON failure (relay contact ( 511,521,531)} or not.

Specifically, in the state where the solenoid valve control unit 410 does not send out the energizing signals 411, 412, and 413, all of the contacts of the relay contacts 511, 521, 531 are turned off, and which solenoid valve (original solenoid valve 21, kettle) No current also flows in the valve 22 and the switching valve 26, and no forward voltage is generated between the both ends of the diodes 6, 6 and 6.

However, if any of the contacts {relay contacts 511,521,531} is ON, a current flows through the corresponding solenoid valve and a forward voltage is generated between both ends of the diodes 6, 6, 6, so that the output 80 is a microcomputer 400. ) Is entered.

Check before ignition

If the initial check before the start of the combustion operation is normal, the microcomputer 400 performs the "check before ignition" described later. When the abnormality is detected, a check error is displayed and the operation is stopped.

The solenoid valve control unit 410 sequentially sends out the energization time signals 413, 412 and 411, and determines whether the output 80 is detected by the function confirming unit 420 so that the OFF contact of the relay contacts 511, 521, 531 and connector Check if there is a misfit between the parts, bad contact, cable disconnection, or solenoid valve disconnection.

Specifically, first, when the solenoid valve control unit 410 sends out the energization time signal 413, the connection between the connector 261 and the board side connector 43 is completed, and the switching valve 26 is disconnected. If not, a current flows through the switching valve 26, and a forward voltage is generated between the both ends of the diode, so that the function checking unit 420 detects the output 80. Similarly, the solenoid valve control unit 410 sequentially sends and checks the energization time signals 412 and 411.

However, for example, the connector 261 and the board-side connector 43 may cause misalignment or poor contact, the electromagnetic coil of the selector valve 26 is disconnected, the cable is disconnected, or the relay contact 531. ) Is OFF (at least one has occurred), the forward voltage does not occur between both ends of the diodes 6, 6, and 6, and the function confirmation unit 420 does not detect the output 80.

When the microcomputer 400 detects an abnormality in the "check before the telephone call", the microcomputer 400 displays a check error and instructs stop of operation.

Next, the advantages of the solenoid valve function monitoring device A attached to the gas water heater U will be described. [A] The solenoid valve function monitoring device A has a failure check of the relay circuits 51-53. ON / OFF failure of 511,521,531, or misalignment or poor contact with the connector (211,221,261) board side connectors (41-43), the solenoid valve (21), the kettle valve (22), the switching valve (26) Various functional checks can be performed, such as a fault check.

[B] Since the solenoid valve current flows due to the forward voltage (about 1.8 V) of the diodes 6, 6 and 6, it is inexpensive, generates less heat, and saves space compared to using a resistor. Can be. In addition, even if some of the relay contacts 511, 521, 531 are turned on, the forward voltage of the diodes 6, 6, 6 is substantially constant, so that deterioration of the photo coupler 81 can be prevented.

Since the photo coupler 81 is used, the negative side of the capacitor 61 can transmit to the function confirming unit 420 that a forward voltage has occurred even when the microcomputer 400 is not electrically connected to the ground point. .

[D] In the [check before ignition], even if the solenoid valve control unit 410 sequentially sends out the energization time signals 413, 411, and 412, the output checking unit 80 detects the output 80, Since there may be only one input port of the photo coupler 81 or the output 80, a part price can be saved.

[E] Since three silicon diodes are connected in series to form diodes 6, 6, and 6, and a forward voltage of about 1.8 V is generated, the photo coupler 81 can be driven with ease.

The present invention includes the following embodiments in addition to the above embodiments.

a. If the cathode side of the diode is grounded, the forward voltage may be input to the microcomputer only by using a transistor without using a photo coupler.

b. If the forward voltage is detected using a photo coupler, the order of series connection of the board-side connector, the control switch, and the diode may be arbitrary.

c. The solenoid valve function monitoring device A may be applied to a gas table, a gas stove, a gas hot air fan heater, or the like.

Claims (5)

A board side connector to which the connector connecting the solenoid valve is fitted; A solenoid valve control means for connecting the control switch and the diode closed by the input of the energizing signal in series to connect with a DC power source and instructing the energizing signal to be sent, and between the instruction to send the energizing signal and both ends of the diode. And a microcomputer having a function checking means for inspecting the function of the solenoid valve system on the basis of the presence of a generated forward voltage. A board side connector to which the connector connecting the solenoid valve is fitted; The serial connection of the control switch, which is closed by the input of the signal at the time of energization, is connected in series with the solenoid valve circuit connected in parallel with the diode, and is connected to the DC power supply. A microcomputer having an instructing solenoid valve control means and a function checking means for inspecting a function of the solenoid valve system on the basis of the transmission instruction of the energizing signal and the presence or absence of a forward voltage generated between both ends of the diode; Functional monitoring device, characterized in that. The function according to claim 1 or 2, wherein the function checking means determines that the control switch is ON when the forward voltage is detected before giving an outgoing signal of the energizing time. Surveillance device. The method according to claim 1 to 3, wherein when the forwarding signal of the energizing time signal is sent, when the forward voltage is not detected, an OFF failure of the control switch, a connector connection failure, a cable disconnection, or a solenoid valve failure. And said function checking means determines that at least one of them has occurred. The functional monitoring device according to claim 1, wherein the function checking means detects the forward voltage by a photo coupler circuit.