JPH0367920A - Combustion controller for gas burner - Google Patents

Abstract

PURPOSE:To make it possible to secure a specified combustion quantity by detecting a change in pressure difference in a passage by a pressure sensor when a change in the volume of passing air occurs due to a gust, clogging in the supply and exhaust section, etc. and controlling the blast so as to bring it to a set volume by a feedback circuit in the control section. CONSTITUTION:A hot water temperature setting device D sets the temperature of the delivered hot water of a heat exchanger 34, and a water temperature sensor E detects the temperature of the water that flows into a heat exchanger 34. And, a flow rate detector F detects the volume of the water that flows into the heat exchanger 34. A required volume of gas and required volume of blast are set and they are set as standard values by calculating the output signals of those hot water temperature setting device D, water temperature sensor E, and flow rate detector F. And the volume of the blast in a combustion air (or mixture gas) channel is detected by the pressure difference generated in the channel as a passage pressure loss and detected by a pres sure sensor P, and at the same time the pressure difference signal is inputted to a control section C as an actual blast volume signal corresponding to it, and in the control section C the deviation between the standard blast volume signals and actual blast volume signal is corrected by a feedback circuit to control blast volume.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a combustion control device used in a full-zip interlocking type gas burner device.

[Conventional technology]

When using the all-primary mixing method for a water heater or other device that proportionally controls the combustion load, the quality of the air ratio control becomes a problem because the combustion range is much narrower than that of the Bunsen method.

For this reason, in the past, an electronic control method 11 was adopted in which the combustion state was detected by a sensor and the amount of raw gas and combustion air (hereinafter referred to as "air") were individually controlled while providing feedback. Ta.

However, this control method uses electronic control, which complicates the element conversion and component configuration in the foot handle circuit, and requires sensor precision and response speed, which requires maintenance.
Therefore, the production cost is high and the reliability is poor.

Furthermore, when pressure changes occur due to gusts of wind, etc., the degree of influence differs between the amount of air and the amount of raw gas, so the design is designed to spread the source pressure of the blower fan to minimize the effects of gusts of wind, etc. However, the number of rotations of the blower fan must be increased or the diameter of the fan must be increased, which increases the production cost of the blower fan and tends to generate noise.

In order to eliminate these drawbacks, the inventor devised a ratio control valve (Patent Application No. 1-1.15885, Japanese Patent Application No. 134196). With this ratio control valve,
Easily maintains a constant air ratio against disturbances such as gusts of wind or changes in passage resistance such as clogging of the intake and cultivation parts of water heaters, etc., and reduces the number of rotations of the blower fan to the necessary minimum. I made it possible to keep it.

[Problem to be solved by the invention]

However, since this ratio control valve maintains the air ratio constant, if the air amount changes due to gusts, etc.
A corresponding amount of raw waste was supplied, and the combustion amount changed, resulting in the following inconvenience.

(1) When the gas burner device is used in a water heater, the hot water temperature inevitably changes.(2) Also, in order to prevent this change in the hot water temperature, a temperature sensor is used to control the hot water temperature. A method was considered to correct the set temperature by detecting the temperature and controlling the blower fan using a soi 1-verter method, but this method requires a heat exchanger, water (hot water), Since a heat transfer element such as a temperature sensor is involved5, the response speed must be slow.

(3) Furthermore, there is a possibility that the burner may deviate from the limits (upper and lower limits) of the amount of combustion per unit area under the same air ratio.

The problem of this invention is to solve these disadvantages? +! It is to do something.

[Means to solve the problem]

In order to achieve the above object, in the combustion control device for a gas burner according to the present invention, a blower fan supplies combustion air, a control section appropriately controls the combustion ML of the burner section, and a ratio control valve section controls the combustion air. In a gas burner device that maintains the air ratio of the air-fuel mixture supplied to the burner section at a constant value, the gas burner device includes a pressure sensor, means for setting a target airflow rate, and a reference airflow rate signal corresponding to the target airflow rate. means for controlling the combustion air in the burner section by the pressure sensor;
The airflow rate in the passage (or air mixture) is detected by the pressure drop generated in the passageway, and this differential pressure signal is input to the control unit as a corresponding actual speed airflow signal, and this control unit Then, the deviation between the standard airflow volume signal and the back road airflow signal is corrected using a foot hook circuit, and airflow control is performed.

In addition, the blower fan supplies combustion air, and the control section controls combustion in the burner section as appropriate.
and a means for setting a pressure sensor in the gas burner apparatus, a means for setting a target ventilation volume, and a means for setting a target ventilation volume. and a means for setting a base TLT air flow rate signal corresponding to the above, and the pressure sensor detects the amount of gas passing through the raw gas passage of the heena section by detecting the passage pressure loss generated in the passage, and detects the differential pressure. At the same time, this differential pressure signal is input to the control I-roll section as a corresponding actual airflow volume signal, and this control section controls the base! The deviation between the 48 airflow rate signal and the actual airflow rate signal is corrected by a foot hack circuit to control the airflow rate.

[Action of the invention]

Since the combustion control system for gas burners configured in this way is configured as described above, when the ventilation rate changes due to gusts of wind or clogging of the air supply/exhaust section, it will not be affected by the change in the passage differential pressure. Since the pressure sensor detects this, the air volume control unit 9 operates to reach the set air volume using the foot circuit in the control section, and as a result, the set combustion volume is maintained.

[Explanation of Examples]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, G is a gas burner section of the gas water heater 1, C is a control section for this gas burner section G, and R is a ratio control valve section that controls the amount of raw gas supplied to the gas burner section G.

11 is an air chamber case of the gas burner section l; 12 is a mixing chamber case installed in the air chamber case 11; and 13 is a heat exchanger inner shell installed in the upper part of the air chamber case 11. In this case, an air chamber hole is formed between the air chamber case 11 and the mixing chamber case 12, and the inside of the mixing chamber case 12 constitutes a mixing chamber M. Reference numeral 14 denotes a blower fan, which is provided in a protruding manner on the air chamber case 11. Air is supplied to the air chamber A by this ventilation fan 14. Reference numeral 2 denotes a gas supply pipe, which is arranged on the bottom surface of the air chamber case 11. This gas supply pipe 2
Raw gas is supplied from the ratio control valve section C to the gas burner section G via. A nozzle 21 is provided to protrude from the gas supply pipe 2 .

This nozzle 21 protrudes into the mixing chamber M, and the ejection hole 21
1,211. The /4E waste is ejected into the mixing chamber M through... Here, since the gas supply pipe 2 is connected to the ratio control well R indicated by +i'lf, the raw waste is supplied to the gas burner section G with the air ratio always kept constant. In addition, the ratio dividing valve part R is configured to handle the fluid (
It operates due to the differential pressure between the upstream side and the downstream side at the pressure loss part of the mixture of raw gas and combustion air. 3],,3
], . . . are through holes formed in the bottom plate of the mixing chamber case 12. Air (air supplied by the blower fan 14) is supplied into the mixing chamber M through the through holes 31.3L, and is mixed with the raw gas. Reference numeral 32 denotes a pressure equalizing plate, which is installed near the top of the nozzle 21. This pressure equalization plate 311 maintains the mixing space, and the mixed gas (a mixture of /4F gas and air,
The same applies hereafter) to equalize the pressure. 33 is a flame hole plate, which is installed at the open end of the mixing chamber case 12. Further, 331, 331, . . . are pores, which are formed in the flame hole plate 33. This pore 331.331.
, . . , 7) 1 scum is ejected into the heat exchanger inner shell 13 and burned.

34 is a heat exchanger, which is installed on three sides of the flame hole plate 33 in the heat exchanger inner shell 13. This heat exchanger 34 includes a water pipe 341 and fins 342, 342. ... and heats the water passing through the water pipe 341 by the combustion heat of the mixed gas.

Next, in FIG. 1, FIG. 2, and FIG. 3, D is a hot water temperature setting device, which is used to set the temperature of hot water discharged from the heat exchanger 34.

A water temperature detector E is used to detect the temperature of water flowing into the heat exchanger 34.

F is a flow rate detector, which is for detecting the amount of water flowing into the heat exchanger 34.

By calculating the output signals of these hot water temperature setter D, water temperature detector E, and flow rate detector F, the required gas amount and ventilation amount are set and set as reference values. Here,
The hot water temperature setting device r) corresponds to the "target air volume setting means" of the present invention.

Note that FIG. 2 is a block diagram of a control section that feeds back air differential pressure as pressure loss, and FIG. 3 is a block diagram of a control section that feeds back gas differential pressure as pressure loss. , 4th
Supplementally, as shown in FIG.
At the outlet of water pipe 341? A temperature sensor T is installed, the hot water temperature signal detected by this sensor is inputted to the control section C, and the blower fan 14 is controlled by a feed bar method that detects the deviation from the set hot water temperature. , the hot water temperature in the heat exchanger 34 can be controlled with higher precision. In this case, FIG. 4 is a block diagram of a control section that feeds back air differential pressure as a pressure loss, and FIG. 5 is a block diagram of a control section that feeds back gas differential pressure as a pressure loss. In the case of pressure sensor'! tP
Although it is installed in the ratio control valve part R, it is not limited to this, but it can be installed in any place where the differential pressure of the raw gas or combustion air supplied to the gas burner part G can be detected. .

[Effects of the Invention] The combustion control device for a gas burner of the present invention supplies combustion air using a blower fan, appropriately controls combustion in the burner section using a control section, and supplies air to the burner section using a ratio control wholesale valve section. In a gas burner device that maintains a constant air ratio of seven airflows, the gas burner device is equipped with a pressure sensor, a means for setting a target airflow amount, and a means for setting a reference airflow amount signal corresponding to the target airflow amount. and the pressure sensor detects combustion air (
1-1-11. Or mixture) Detect the differential pressure by detecting the airflow rate in the passage by detecting the passage pressure loss generated in the passageway, and use this differential pressure signal as the corresponding actual airflow rate signal.1-1-11. This control section corrects the deviation between the reference airflow rate signal and the actual airflow rate signal using a feedbark circuit to control the airflow rate, and also supplies combustion air with a blower fan. In a gas burner device that appropriately controls the combustion in the burner section by a control valve section and maintains a constant air ratio of the air-fuel mixture supplied to the burner section by a ratio control valve section, this gas burner The apparatus is provided with a pressure sensor, means for setting a target airflow rate, and means for setting a base 41 airflow rate signal corresponding to the target airflow rate, and the pressure sensor determines the amount of gas passing through the raw gas passage of the burner section. The difference in pressure is detected by detecting the passage pressure loss that occurs in the passage, and this differential pressure signal is input to the control unit as the corresponding actual airflow rate signal, and this control unit compares the reference airflow rate signal and the actual airflow rate signal. Since the deviation is corrected by the feed bark circuit and the air volume is controlled, if the air volume changes due to gusts of wind or clogging of the air supply/exhaust section, this will be detected by the pressure sensor as a change in the passage differential pressure. The air volume is controlled by the feed bark circuit of the control unit to reach the set air volume, and as a result, the set combustion volume can be secured.

Therefore, if this combustion control 4FLL device for gas burners is used, the feedbar signal directly corresponds to the flow rate without intervening heat transfer elements such as a heat exchanger, water (hot water), or temperature sensor. The response speed is fast, and as a result, the blower fan can be immediately controlled in response to disturbances, and the gas water heater can be operated while quickly correcting the effects of disturbances.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the combustion control device for a gas burner according to the present invention, FIG. 2 is a first flowchart of the control section, FIG. 3 is a second flowchart of the control section, and FIG. 4 is a third flowchart of the control section. FIG. 5 is a fourth flowchart of the control section. Blow fan control section Hot water temperature setting device Water inflow detector Flow rate detector Burner section Pressure sensor 3 4 R Ratio control valve section Patent application Artificial Iken Industry Co., Ltd. ■ Procedures formalities (method) (spontaneous) 1. Display of case: 1999 Patent Application No. 203591 2,
Title of the invention Combustion control device for gas burner 3, relationship to the amended case Patent applicant address 1370 Kadoya, Hamaoka-cho, Ogasa-gun, Shizuoka Name Aiken Kogyo Co., Ltd. Representative Kono Sanbe 4, Agent Address 430 Hamamatsu, Shizuoka Prefecture 218-29, Ichimotojocho (Flower Building 5th floor) 6. Subject of amendment Drawing 7. Contents of amendment

Claims (2)

[Claims] (1) While supplying combustion air by a blower fan, combustion in the burner section is appropriately controlled by a control section, and the air ratio of the mixture supplied to the burner section is maintained constant by a ratio control valve section. A gas burner device is provided with a pressure sensor, means for setting a target airflow rate, and means for setting a reference airflow rate signal corresponding to the target airflow rate, and the pressure sensor controls combustion air in the burner section. (
The airflow rate in the passage (or air mixture) is detected by the pressure drop generated in the passageway, and the differential pressure is detected, and this differential pressure signal is input to the control unit as the corresponding actual airflow rate signal. A combustion control device for a gas burner, characterized in that a deviation between a volume signal and an actual airflow volume signal is corrected by a feedback circuit to control the volume of air. (2) While supplying combustion air by a blower fan, combustion in the burner section is appropriately controlled by a control section, and the air ratio of the mixture supplied to the burner section is maintained constant by a ratio control valve section. The gas burner device is provided with a pressure sensor, means for setting a target airflow rate, and means for setting a reference airflow rate signal corresponding to the target airflow rate, and the pressure sensor controls the raw gas passage of the burner section. The amount of gas passing through the passage is detected by the passage pressure loss generated in that passage, and this differential pressure signal is input to the control unit as the corresponding actual airflow rate signal, and this control unit compares the reference airflow rate signal and the actual airflow rate signal. A combustion control device for a gas burner, characterized in that the deviation from the airflow rate signal is corrected by a feedback circuit to control the airflow rate.