JPH0355424A - Gas burner controller - Google Patents

Abstract

PURPOSE:To obtain the most suitable combustion by not connecting a control module to a gas pipe and making it actuate with the compressed air that is supplied by a fan. CONSTITUTION:A control module 19 that operates with the compressed air supplied by a fan 9 is placed as near as possible to a gas control valve 15, and it is possible to regulate different rates of gain of the control module by only exchanging diaphragms 18 and 43 simply or changing the control module itself. Further, it is possible to regulate a control device 6 for requirements of a burner system and a burner chamber 11 without a change in the control valve. It is possible to guarantee a high pressure control that is highly reliable of the gas control valve by the gain and a high choking force that is generated by a choking member 21. It is possible to improve the control performance and raise the stability in output pressure of the gas control valve by providing in another control module 19 an amplification diaphragm 18 and a control diaphragm 43 that are placed mutually close to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to a gas burner control device, and more particularly to a gas burner control device that adjusts the flow rates of gas and combustion air to always enable optimal combustion.

[Prior Art 1] In a conventional gas burner control device, for example, as in West German Patent Application No. 3010737, a temperature sensor controls the main valve of the gas control device by means of a servo pressure regulator, and the control pressure is simultaneously controlled by a separate diaphragm actuator. The flasher installed in the combustion air supply pipe is adjusted in the same way as controlling the gas valve. Furthermore, as a similar Mm device, West German Patent Application No. 31
47857, where the temperature sensor measuring the heat demand does not actuate a gas control valve, but rather an air control member connected in series with the fan via a servo pressure regulator. Are known. The servo pressure regulator is attached to the air control valve. The control pressure of the servo pressure regulator is simultaneously transmitted to the diaphragm operating part of the gas valve via the connecting pipe. Furthermore, West German Patent Application No. 3,114,954 (corresponding U.S. Pat. No. 44)
No. 36,506), it is also known to control the amount of combustion air by using an air control valve connected in series with the fan as described above, or by controlling the speed of the fan itself. The present invention aims to improve the above-mentioned control device in terms of its functionality and safety. The control module of the invention is not connected to a gas line, as in West German Patent Application No. 3110737, but operates with compressed air supplied by a fan. Therefore, the model according to the invention can be installed in close proximity to the gas valve without compromising the safety of the device, and it can also be installed in close proximity to the gas valve and, by extension with a flexible conduit, to the pressure measuring boat in the empty gas supply channel. You can also connect to. Even when the amount of air is small and only a very small differential pressure can be obtained, the model of the present invention can supply a sufficiently strong air control signal to the diaphragm operating part of the gas valve by its amplification function. This function allows the amount of supplied gas to be made proportional to the amount of combustion air even at low flow rates. Furthermore, optimal combustion can be obtained in the above-mentioned cases. [Embodiment 1] An embodiment of the present invention will be described with reference to the attached drawings.
In FIG. 1, a heat exchanger l is connected to a load (not shown) by a supply pipe 2 and a reflux pipe 3. The temperature sensor 4 measures the temperature of the heated water supplied to the load and supplies a corresponding signal to the actual measurement power 5 of the temperature control device 6 . The control device 6 receives at a set point input 7 a signal corresponding to the desired temperature from the manual adjustment means. The M1tll device 6 controls the energy supplied to the motor 8 of the fan 9 via a converter. The burner 11 is supplied with compressed air by an air channel 10. Burner 11 and heat exchanger! is located in a shielded burner chamber 12. Exhaust gas is discharged from the burner chamber l2 through the chimney l3. A gas nozzle l4 is provided in the air channel 10, and gas is supplied from a gas mw hub l5. This gas fl4
The m-harvest 15 is, for example, a combination gas pulp V4700 manufactured by Honeywell. When fan 9 is switched off, pressure measuring line l6
, 17 have the same pressure. The same pressure is also present on both sides of the ItIIN control diaphragm l8 of control module l9. A spring 20 is attached to this diaphragm l8, and a seat 22 is attached to the closing member 2l of this servo valve.
Press against. Therefore, the servo valves 2l, 2
2 continues to be closed by the force of spring 20. When fan 9 is switched on, the pressure at input 5 of conduit l6 increases and the pressure in conduit 17 connected to nozzle 23 decreases. As a result, a force assisting the force of spring 20 acts on diaphragm l8. A higher pressure will develop in the left-hand chamber 24 of the diaphragm l8 than in the right-hand chamber 25, and the servovalve 21,22 remains closed. A main valve consisting of a closing member 28 and a pulp sheet 29 is provided between the input 26 and the output 27 of the gas fM control valve 15. The closing member 28 is urged in the opening direction by the /1 lubstem 30 and the spring 31. The valve stem 30 abuts the actuating diaphragm 32 of the servo pressure regulator. A demand for heat causes the closing member 35 of the switch-on valve to move from the illustrated rest position to the opposite position. This movement is effected by a solenoid 33 and a spring biased rod 34. Therefore, the closing member 35
closes the boat 36. At the same time, gas from the input 26 flows through the throttle 37 into the space 38 and from there to the diaphragm chamber 39 of the main valve. The diaphragm 32 is moved downward by the pressure within the diaphragm chamber 39, and the main valves 28 and 29 are opened. The gas from the input 26 thus flows to the output 27 and further via the conduit 40 to the gas nozzle l4 of the burner 1l. The pressure at output 27 of the gas control valve is supplied through channel 4l to chamber 42 of lM# diaphragm 43111. The diaphragm 43 faces the control diaphragm l8 and is provided with a closing member 2l. An adjusting screw 52 is provided for zero adjustment, and a spring 54 attached to it acts on the control diaphragm l8. By adjusting the screw 52 within the range of the thread formed in the cylindrical portion 53, the spring 5
4 and which acts on the diaphragm l8 can be adjusted. Furthermore, the pressure at output 27 is supplied via channel 44 to chamber 45 below diaphragm 45. This diaphragm 45 has a closing member 50 that operates together with the hull seat 5l.
Equipped with The compression spring 47 is connected to the cylindrical portion 4 via the adjustment screw 46.
This servo valve 50.
51 toward the diaphragm 49 in the closing direction. An adjustment screw 46 allows the maximum gas pressure to be adjusted and limited. A servo pressure regulator consisting of a diaphragm 49, a spring 47, a closure member 50 and a seat 5l is also used in Honeywell's Pulp Series V4700 to limit the maximum gas pressure. Seat the closing member 50}
The force pressing against the sheet 2 is applied by the spring 47.
U4 is adjusted so that it is larger than the force that closes the closing member 2l of No. 2. A second servo valve consisting of a diaphragm 43, a closing member 2l, and a seat 22 has springs 20, 54.
It is also used to zero the control curves for air and gas volumes. The valve seat 22 of the servo valves 2l and 22 is connected to the conduit 55
It is connected to chamber 38 via. This valve seat 2
2 there is a pressure in chamber 39 which is the same as the pressure acting on the diaphragm 32 of the actuator of the main valves 28, 29. Pressure at output 27 and with it channel 41.4
When the pressure at 4 increases and the force acting on the diaphragm caused by this pressure exceeds the opposing force exerted by the spring 20 on the diaphragm l8 from the opposite side, the closing member 2l lifts off the hull seat 22 and the acting force in the chamber 38 increases. are conduit 55, valve seat 22, chamber 42 and channel 4
leaks to output 27 via l. This is the normal control operation of a servo pressure regulator. This pressure is applied to conduits l6, 17
It is controlled depending on the differential pressure between the air supply channels 10 and the air flow rate flowing through the air supply channel 10. The amount of gas supplied to the burner 11 via the nozzle l4 is continuously adjusted by the amount of air supplied by the fan 9. In this way, the burner 11 is always supplied with a constant air/gas mixture even as the required heat and combustion air flow rates vary. Furthermore, the amplification factor of the control model 19 is determined by the operating area ratio of the diaphragm 18.43. When the heating device is switched off, the switch-on valve 35 is moved to the rest position as shown by the force of its closing spring, and the control pressure in the chamber 38 is transferred to the output 27 via the pulp seat 36. Leak. And main pulp 2
8 and 29 are closed. Since the conduits 16,17 are filled with air rather than gas, flexible tubing of any desired length can be used. Control model l9 is placed as close as possible to gas control valve l5. By using a separate control module that is not integrated with the gas control valve, different gain factors of the control module can be adjusted by simply replacing the diaphragm l8, 43 or by replacing the control module itself. There are advantages,
The control device can be adjusted to the requirements of the burner system and burner chamber without changes in the gas control pulp. The gain obtained by the servo model and the high closing force generated by the closing member 2l can ensure reliable pressure control of the gas control valve. By providing the amplifying diaphragm 18 and the control diaphragm 43 close to each other in separate control modules 19, the control performance can be improved and the stability of the gas-controlled pulp output pressure can be increased. This valve may be a standard gas control valve used in a variety of applications;
Select and combine control models as appropriate for each application. Since the surface area of the diaphragm l8, 43 is freely adjustable, a relatively high gain factor can be obtained.

To make this possible, these diaphragms can be integrated with gas control valves. The control module can be installed anywhere except the gas control valve itself, depending on the gas control valve installation location. In particular, if a flexible conduit is used for the connection, the control module can be installed at a desired position within a heating device with a large space, making adjustment easier. Control model l9 and air channel 1
0 through a flexible conduit, the optimum positions of the inputs 23 and 56 can be selected, allowing stable operation. Separate servo pressure regulator 46 to adjust maximum pressure
, 47, 49, 50.51, the maximum pressure may be limited by limiting the maximum stroke of the control diaphragm by means of an adjustable stocker.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the burner control device of the present invention. 6. Temperature control device8. ．． ．． ．． Fan 11. ．． ．． ．． Burner 1 5. ．． ．． ．． Gas control valve 1 8. ．． ．． ．． Control diaphragm 19. ．． ．． ．． Control model 21.22 Bleed valve 23, 56 Nozzle 28, 29. Main valve 43. ．． adjustment diaphragm

Claims (1)

[Claims] 1. A burner control device that includes a gas control valve that controls a gas flow rate and a fan that supplies combustion air, and supplies gas and combustion air to a burner in accordance with a heat request of a load, comprising: temperature control means for generating an output signal for controlling the combustion air flow rate in accordance with the amount of heat supplied; nozzle means disposed within the air supply channel for generating a pressure difference proportional to the air flow rate; a control module having a large area control diaphragm exposed on both sides and operating as an amplified servo pressure regulator to regulate the flow of gas and air for optimum combustion; a bleed valve comprising a seat connected to the actuator chamber of the main valve; and a bleed valve attached to the control diaphragm via a spring, having a narrower working surface than the control diaphragm and supporting a closing member of the bleed valve. A burner control device comprising: a regulating diaphragm; and a chamber formed on the opposite side of the regulating diaphragm from the control diaphragm and connected to the output of the gas control valve.