JP3072639B2 - Gas combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas combustion apparatus, and more particularly to a gas combustion apparatus which is easy to check and adjust and which is efficient.

[0002]

2. Description of the Related Art Based on input signals from a temperature setter and a temperature detector, a gas amount calculator calculates and outputs a voltage corresponding to a required gas amount, and a current converter calculates a current corresponding to the output voltage. In a gas combustion device that outputs a gas and a gas proportional valve opens and closes the valve based on the output current, and sends the generated secondary pressure gas to a gas burner and burns it, a maximum combustion state or a minimum combustion state (these are called limit combustion states). In this case, the adjustment must be made for each device so that the gas secondary pressure becomes the preset maximum limit gas pressure or the minimum limit gas pressure, respectively.

[0003] The maximum limit gas pressure or the minimum limit gas pressure is a common set value for each gas combustion device, but the output voltage at the time of realizing this limit gas pressure is a unique value for each gas combustion device.

Therefore, paying attention to the output voltage to the current converter, the output voltage is manually adjusted for each gas combustion device so that the gas pressure in the limit combustion state becomes the preset limit gas pressure. , The output voltage after the adjustment to the limit voltage (maximum voltage DVmax and minimum voltage DVmi) for each device.
The operation of updating and storing as n) is performed at the time of installation and inspection of the gas combustion device.

Such a conventional gas combustion apparatus is disclosed in Japanese Patent Application Publication No. Hei 3-60015, which discloses a maximum secondary pressure setting switch or a minimum secondary pressure setting switch connected to individual input terminals provided in a gas amount calculator during inspection and adjustment. The operator turns on the switch for setting the secondary pressure, defines one of the limit combustion states and starts it, and sets the maximum pressure adjusting resistor or the minimum pressure connected to an individual input terminal different from the input terminal. An operator adjusts the adjustment resistor to adjust the output voltage from the gas calculator, and updates the limit voltage with the output voltage when a preset limit gas pressure is realized.

[0006]

However, the gas combustion apparatus has a high temperature and humidity, and is apt to generate dust. Therefore, in the conventional gas combustion apparatus having many input terminals and many device parts connected to the input terminals, there is a problem that a contact failure or a failure is likely to occur.

Further, in the above-mentioned conventional gas combustion apparatus, when the limit combustion state is set at the time of inspection or the like, the limit combustion state is started only by the signal for turning on the dedicated setting switch. Separate inspection work to check whether the input circuit including the sensor circuit that receives signals from the connected temperature setting device and temperature detector and the input circuit operates normally is required in addition to the limit voltage check and adjustment work. There is a disadvantage that the efficiency is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems and disadvantages, and an object of the present invention is to provide a gas combustion apparatus in which the number of input terminals and the number of equipment components connected thereto are reduced, and the occurrence of contact failures and failures is reduced. Is to do.

Further, inspection and adjustment of limit combustion and inspection of circuits such as a sensor circuit and an input circuit can be carried out at once.
Accordingly, it is an object of the present invention to provide a gas combustion device capable of improving inspection work efficiency.

[0010]

According to a first aspect of the present invention, there is provided a gas combustion apparatus, comprising: a set temperature input terminal for inputting a set temperature signal output from a temperature setter; A detected temperature input terminal for inputting a detected temperature signal output from a temperature detector for detecting the temperature of the input terminal; an external input terminal for inputting an external signal; an Rmax input terminal for connecting a maximum pressure adjusting resistor; A gas amount controller having an Rmin input terminal for connecting a resistor, an output terminal for outputting an output voltage, a voltage-current conversion circuit connected to the output terminal, and an output current of the voltage-current conversion circuit In the case where the external signal is not input to the gas amount controller in a gas combustion device including a gas proportional valve that controls a valve opening according to the valve opening and sends a gas amount corresponding to the valve opening to a gas burner, A temperature difference signal based on the set temperature signal and the detected temperature signal is output, and when a first external signal is input, a first specific signal for maximizing the valve opening of the gas proportional valve is output. , When a second external signal is input, a second valve that minimizes the valve opening of the gas proportional valve
And a voltage calculating means for calculating the output voltage based on an output signal of the input signal receiving means.

According to a second aspect of the present invention, the gas combustion apparatus further comprises a limit voltage storing means for storing a predetermined maximum voltage and a minimum voltage as a limit voltage, and the input signal receiving means includes the maximum pressure adjusting resistor, the minimum pressure, An upper limit voltage corresponding to the resistance value of the adjustment resistor, an adjustment mode for calculating the output voltage based on the lower limit voltage, and a normal mode for calculating the voltage signal based on the limit voltage, according to the presence or absence of the external signal. In addition to the above configuration, the limit voltage storage unit is configured to store the upper limit voltage and the lower limit voltage as the limit voltage when switching from the adjustment mode to the normal mode.

[0012]

According to the first aspect of the present invention, the gas combustion apparatus receives a signal from a temperature setter for setting a target temperature and a signal from a temperature detector for detecting the temperature of water or hot water as an input signal of a gas amount controller. Means accept. The input signal receiving means outputs a temperature difference signal based on the set temperature signal and the detected temperature signal. On the other hand, the external signal generated by the external controller comprises a first or a second external signal. When the external signal is input, the input signal receiving means causes the first or the second to make the valve opening of the gas proportional valve maximum or minimum. And outputting a second specific signal. Further, upon input of the temperature difference signal or the first or second specific signal, the voltage calculation means calculates an output voltage based on this signal.

In the gas combustion apparatus according to the second aspect, the input signal receiving means includes an adjustment mode for calculating an output voltage based on the resistance values of the maximum pressure adjustment resistor and the minimum pressure adjustment resistor, and a normal mode. Switch according to presence / absence. Here, when switching from the adjustment mode to the normal mode, the limit voltage storage means stores the upper limit voltage and the lower limit voltage corresponding to the maximum pressure adjustment resistance value and the resistance value of the minimum pressure adjustment resistor as the limit voltage. In the normal mode, the voltage calculation means calculates the output voltage based on the limit voltage stored in the limit voltage storage means.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a gas combustion apparatus according to claims 1 and 2. The gas combustion device 1 according to claim 1 includes a gas amount controller 2, a temperature setting device 3, a temperature detector 4, a voltage-current conversion circuit 5, and a gas proportional valve 6.

The gas amount controller 2 of the gas combustion apparatus 1 according to the first aspect includes a set temperature input terminal 201, a detected temperature input terminal 202, an external input terminal 203, an output terminal 204, and Rmi.
an input signal receiving means 207; a necessary combustion amount calculating means 20;
8, voltage calculation means 209, calculation formula setting section 210, and limit voltage calculation means 212.

The controller 20 is an external device, and is connected to the gas combustion device 1 when adjusting the gas combustion device 1. The gas burner 7 burns by gas supply from the gas proportional valve 6.

A set temperature signal TS from a temperature setter 3 for inputting a target temperature is detected via a set temperature input terminal 201, and a detected temperature TH from a temperature detector 4 for detecting the temperature of water or hot water is detected. The signal is received by the input signal receiving means 207 via the temperature input terminal 202, and outputs a temperature difference signal dT. The required combustion amount calculating means 208 calculates the temperature difference signal d.
Upon receiving T, the required combustion amount is calculated and sent to the voltage calculation means 209 as the combustion amount F.

On the other hand, the resistance value Rmax of the maximum pressure adjustment resistor 24 and the resistance value Rmin of the minimum pressure adjustment resistor 23 provided in the controller 20 are supplied to the limit voltage calculation means via the Rmax input terminal 206 or the Rmin input terminal 205, respectively. 2
Enter 12. The limit voltage calculating means 212 calculates the corresponding upper limit voltage Vmax or lower limit voltage Vmin, and
2a is sent to the arithmetic expression setting unit 210. The arithmetic expression setting unit 210 uses this as the signal 210a and
9

The voltage calculating means 209 calculates a combustion amount F based on the input upper limit voltage Vmax or lower limit voltage Vmin.
Is calculated and output as the output voltage V.

The output voltage V is applied to a voltage-current conversion circuit 5
Is converted into a current I and enters the gas proportional valve 6. The valve opening of the gas proportional valve 6 is controlled in accordance with the current I, and a gas amount corresponding to the valve opening is delivered to the gas burner 7.

On the other hand, the maximum limit combustion instruction means 21 of the external controller 20 emits a first external signal TX1, and the minimum limit combustion instruction means 22 emits a second external signal TX2, and either of them is switched by a switch SW. Then, the input signal receiving means 207 via the external input terminal 203 of the gas combustion device 1
To enter.

When this external signal is input, the input signal receiving means 207 outputs the first specific signal S1 as the corresponding specific signal.
Alternatively, the second specific signal S2 is output to the required combustion amount calculating means 208. Here, the input signal receiving means 207 determines that the voltage calculated corresponding to the first specific signal S1 is equal to the upper limit voltage Vm.
The first specific signal S1 and the second specific signal S2 are configured such that the voltage is equal to or more than ax and the voltage calculated corresponding to the second specific signal S2 is equal to or less than the lower limit voltage Vmin.

The required combustion amount calculating means 208 calculates the combustion amount F corresponding to the first specific signal S1 or the second specific signal S2 constructed as described above, and calculates the voltage calculating means 20.
9 The voltage calculator 209 outputs the first specific signal S
Since the voltage calculated when the combustion amount F corresponding to 1 exceeds the upper limit voltage Vmax, the upper limit voltage Vmax is output as the output voltage V in this case. Further, since the calculated voltage when the combustion amount F corresponding to the second specific signal S2 is received is equal to or lower than the lower limit voltage Vmin, the lower limit voltage Vmin is output as the output voltage V in this case.

As a result, by inputting the first external signal TX1 from the maximum limit combustion instruction means 21 of the controller 20 to the input signal receiving means 207, the gas amount controller 2 can output the upper limit voltage Vmax. .

Similarly, the second external signal TX2 from the minimum limit combustion instructing means 22 of the controller 20 is supplied to the input signal receiving means 2
07, the gas amount controller 2 can output the lower limit voltage Vmin.

As described above, the inspection and adjustment operator receives the external signal T.
By inputting X1 or TX2, the upper limit voltage Vmax or the lower limit voltage Vmin can be easily output from the gas amount controller 2, so that adjustment of the gas combustion device can be easily performed.

The gas combustion apparatus 1 according to claim 2 comprises a gas amount controller 2, a temperature setting device 3, a temperature detector 4, a voltage-current conversion circuit 5, and a gas proportional valve 6 in FIG.

The gas amount controller 2 of the gas combustion apparatus 1 according to the second aspect includes a set temperature input terminal 201, a detected temperature input terminal 202, an external input terminal 203, an output terminal 204, and Rmi.
an input signal receiving means 207; a necessary combustion amount calculating means 20;
8, voltage calculation means 209, calculation formula setting section 210, limit voltage storage means 211, and limit voltage calculation means 212.

The controller 20 is an external device and is connected to the gas combustion device 1 when the gas combustion device 1 is adjusted. The gas burner 7 burns by gas supply from the gas proportional valve 6.

The limit voltage storage means 211 stores predetermined maximum voltage DVmax and minimum voltage DVmin as limit voltages. On the other hand, the input signal receiving means 207 includes resistance values Rmax of the maximum pressure adjustment resistor 24 and the minimum pressure adjustment resistor 23,
An adjustment mode for calculating the output voltage V based on Rmin;
The normal mode in which the output voltage V is calculated based on the stored limit voltage is referred to as an external signal (the first external signal TX1 or the second external signal TX1) input from the external input terminal 203.
Switch according to 2).

The first external signal TX1 is input to the external input terminal 203.
Alternatively, when there is an input of the second external signal TX2, the input signal receiving means 207 detects this, and outputs the mode instruction signal 207.
a is set to the arithmetic expression setting unit 210 and the limit voltage storage unit 211
To start the adjustment mode.

When the adjustment mode ends, the input signal receiving means 207 detects that there is no more input to the external input terminal 203, and sends out the mode instruction signal 207a to the arithmetic expression setting section 210 and the limit voltage storage means 211 again. The mode is switched from the adjustment mode to the normal mode. At this time, the limit voltage storage unit 211 stores the upper limit voltage Vmax and the lower limit voltage Vmin held by the operation formula setting unit 210 as the limit voltages (the maximum voltage DVmax and the minimum voltage DVmin).

Next, the operation in the adjustment mode will be described below. Now, it is assumed that the limit voltage storage unit 211 stores a temporary maximum voltage DVmax and a minimum voltage DVmin. Here, when the first external signal TX1 is input from the maximum limit combustion instruction means 21 in order to adjust the maximum combustion state,
The input signal receiving unit 207 switches from the normal mode to the adjustment mode, and outputs, for example, 100 degrees Celsius as the first specific signal S1.

The arithmetic expression setting section 210 is provided with the limit voltage storage means 2
11, the maximum voltage DVmax is read out and sent to the voltage calculation means 209. The voltage calculation means 209 calculates the voltage corresponding to the first specific signal S1, but since this voltage is higher than the maximum voltage DVmax, the maximum voltage DVmax is calculated. As an output voltage V to the voltage-current conversion circuit 5.

The gas proportional valve 6 is controlled by the output current I from the voltage-current conversion circuit 5 to supply a combustion gas to the gas burner 7 and burn it. The inspection and adjustment operator measures the gas pressure P at this time by connecting the gas secondary pressure measuring device 25 and adjusts the maximum pressure adjusting resistor 24 based on a deviation from a preset maximum gas pressure. I do.

The new resistance value Rmax of the adjusted maximum pressure adjusting resistor 24 is input to the limit voltage calculating means 212,
The calculated new upper limit voltage Vmax is calculated by the voltage calculating means 20.
9 is input. The voltage calculation means 209 outputs a new output voltage V, and the gas proportional valve 6 updates the valve opening with the new output current I obtained from the voltage-current conversion circuit 5. Then, since the gas pressure P changes, the inspection operator adjusts the maximum pressure adjusting resistor 24 again based on the deviation between the measured gas pressure P and the maximum gas pressure.

When the above adjustment is repeated and the gas pressure P converges to the maximum gas pressure, the process proceeds to the adjustment of the minimum combustion state.
As described above, the minimum voltage D
Vmin is read, the corresponding output current I is sent to the gas proportional valve 6, and the inspection adjustment operator adjusts the minimum pressure adjustment resistor 23 based on the deviation between the measured gas pressure P and the minimum gas pressure. When the gas pressure P converges to the minimum gas pressure by repeating this adjustment, the gas pressure adjustment is completed.

When the gas pressure adjustment is completed, no external signal is input to the input signal receiving means 207 by the operation of the inspection and adjustment operator. Here, the input signal receiving unit 207 switches from the adjustment mode to the normal mode, and sends the adjustment mode instruction signal 207a to the arithmetic expression setting unit 210 and the limit voltage storage unit 211.

In response to the adjustment mode instruction signal 207a, the limit voltage storage means 211 stores the upper limit voltage Vmax and the lower limit voltage Vmin held by the arithmetic expression setting unit 210 into the maximum voltage DVmax and the minimum voltage DV unique to the gas combustion device 1.
and rewrite and update the storage of the limit voltage. The lower limit voltage Vmin is used as the minimum voltage DVmin specific to the gas combustion device 1, and the limit voltage storage means 211 is rewritten and updated.

Thereafter, in the normal mode, the voltage calculation means 209 calculates the voltage corresponding to the combustion amount F based on the maximum voltage DVmax and the minimum voltage DVmin read from the limit voltage storage means 211. If the voltage is within the range between the maximum voltage DVmax and the minimum voltage DVmin, the voltage is sent to the voltage-current conversion circuit 5 as the output voltage V. If the voltage is out of the range, the maximum voltage DVmax or the minimum voltage DVmin is used as the output voltage V to perform the voltage-current conversion. Send to circuit 5.

FIG. 2 shows a configuration example of an external signal. FIG. 2A shows a case in use in the normal mode, in which a grounding probe 10 as shown is mounted on the external input terminal 203 of the gas amount controller 2. This allows the external input terminal 2
03 becomes 0 potential, and the input signal receiving means 207 can confirm that there is no input of an external signal.

FIG. 2 (b) shows a state in use in the adjustment mode. The external input terminal 203 of the gas amount controller 2 is
Since the signal of the positive potential is input as the first external signal TX1 from the maximum limit combustion instruction means 21 and the signal of the negative potential is input as the second external signal TX2 from the minimum limit combustion instruction means 22, the input signal receiving means is provided. Reference numeral 207 makes it possible to easily confirm the input of the external signal and the type thereof.

It is desirable that the gas amount controller 2 be constituted by a microcomputer of a stored program system. The limit voltage storage means 211 is configured by a nonvolatile memory such as an EEPROM.

[0044]

As described above, the gas combustion apparatus according to claim 1 differs from the conventional gas combustion apparatus in that individual setting switch connection terminals and the like are provided, and the number of input terminals and connection thereto. Since the number of device parts is reduced, it is possible to realize a gas combustion device with less occurrence of contact failure and failure.

Further, the gas combustion device according to claim 1 is
When a temperature difference signal or a first or second specific signal is input, an operation means for calculating an output voltage based on the signal is provided. Therefore, by inputting the first or second external signal, an input signal is received. Inspection of the means and the voltage calculation means can be realized all at once, and a gas combustion device with improved inspection work efficiency can be realized.

In the gas combustion apparatus according to the present invention, the upper limit voltage and the lower limit voltage corresponding to the resistance values of the maximum pressure adjustment resistor and the minimum pressure adjustment resistor are stored as limit voltages. Since the output voltage is calculated based on the voltage, the output voltage can be accurately calculated even if the resistance values of the maximum voltage adjustment resistor and the minimum voltage adjustment resistor change over time during the normal mode.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gas combustion apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration example of an external signal in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas combustion apparatus 2 Gas amount controller 3 Temperature setter 4 Temperature detector 5 Voltage-current conversion circuit 6 Gas proportional valve 7 Gas burner 20 Regulator 21 Maximum limit combustion instruction means 22 Minimum limit combustion instruction means 23 Minimum pressure control resistor 24 Maximum pressure adjusting resistor 25 Gas secondary pressure measuring device 201 Set temperature input terminal 202 Detected temperature input terminal 203 External input terminal 204 Output terminal 205 Rmin input terminal 206 Rmax input terminal 207 Input signal receiving means 207a Mode instruction signal 208 Required combustion Volume calculation means 209 Voltage calculation means 210 Calculation formula setting section 211 Limit voltage storage means 212 Limit voltage calculation means dT Temperature difference signal DVmax Maximum voltage DVmin Minimum voltage F Burning amount I Current P Gas pressure Rmax Maximum pressure adjustment resistance signal Rmin Minimum pressure adjustment Resistance signal S1 First specific signal S2 second specific signal SW switch TH detected temperature signal TS a set temperature signal TX1 first external signal TX2 second external signal V output voltage Vmax upper limit voltage Vmin lower limit voltage

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-155434 (JP, A) JP-A-5-282003 (JP, A) JP-A-61-186958 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F23N 1/00 102 F23N 5/00 F23N 5/02

Claims (2)

(57) [Claims] A set temperature input terminal for inputting a set temperature signal output from a temperature setter; a detected temperature input terminal for inputting a detected temperature signal output from a temperature detector for detecting the temperature of water or hot water; An external input terminal for inputting an external signal, an Rmax input terminal for connecting a maximum pressure adjusting resistor, an Rmin input terminal for connecting a minimum pressure adjusting resistor, and an output terminal for outputting an output voltage. A controller, a voltage-current conversion circuit connected to the output terminal, a valve opening is controlled in accordance with an output current of the voltage-current conversion circuit, and a gas amount corresponding to the valve opening is sent to the gas burner. A gas combustion device comprising a gas proportional valve, wherein the gas amount controller outputs a temperature difference signal based on the set temperature signal and the detected temperature signal when the external signal is not input; If the section signal is input,
A first specific signal for maximizing the valve opening of the gas proportional valve is output. When a second external signal is input, a second specific signal for minimizing the valve opening of the gas proportional valve is output. A gas combustion device comprising: an input signal receiving unit that outputs; and a voltage calculating unit that calculates the output voltage based on an output signal of the input signal receiving unit. 2. Limit voltage storage means for storing a predetermined maximum voltage and a minimum voltage as a limit voltage,
The input signal receiving means, the maximum pressure adjustment resistor, the upper limit voltage corresponding to the resistance value of the minimum pressure adjustment resistor, an adjustment mode to calculate the output voltage based on the lower limit voltage, the voltage signal based on the limit voltage And the normal mode for calculating
In addition to the configuration in which switching is performed in accordance with the presence or absence of the external signal, the limit voltage storage unit is configured to store the upper limit voltage and the lower limit voltage as the limit voltage when switching from the adjustment mode to the normal mode. The gas combustion device according to claim 1, wherein