JP3181142B2 - Gas burner 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 burner device which calculates an air ratio and indirectly monitors an air-fuel ratio.
The air-fuel ratio in the gas burner device used for gas boilers, gas absorption chillers and hot water heaters is maintained in a predetermined state, and stable and complete combustion is performed without generating carbon monoxide and soot. And a configuration for stopping combustion.

[0002]

2. Description of the Related Art Since a gas burner device cannot directly measure an air-fuel ratio, a gas boiler, a gas absorption type chiller / heater, an absorption type chiller, and the like generally use air pressure due to gas pressure and air pressure. Although a proportional control gas burner that calculates the ratio and indirectly monitors the air-fuel ratio is used,
Fluids (gas, air) are turbulent, and the pressure of the detection unit has a large pulsation, so that the controllability is poor, and the air-fuel ratio deviates from a predetermined state, causing inconvenience such as generation of carbon monoxide. . The configuration of a gas burner device that calculates the air ratio based on the data of the gas pressure and the air pressure and indirectly monitors the air-fuel ratio is disclosed in, for example, Japanese Patent Application No. 3-310153 filed by the present applicant. Japanese Patent Laid-Open No. 5-
This is disclosed by Japanese Patent Application Publication No. 118531 (hereinafter referred to as a first conventional technique). Japanese Patent Laid-Open No. 4-292701 discloses a configuration for processing such data using a moving average value.
And Japanese Patent Application Laid-Open No. 4-55615 (hereinafter referred to as a second prior art). And the load factor of the heating load in such a gas burner device, for example, the load factor of an absorption refrigerator, is the actual temperature difference between the chilled water outlet and inlet, and the temperature difference between the chilled water outlet and inlet at 100% load, for example, The load factor (%) is calculated from 5 ° C., for example, the temperature of the cold water inlet is 10 ° C. and the temperature of the cold water outlet is 7 ° C.
Then, the temperature difference is 3 ° C, and the load factor at this time (%)
Is calculated assuming that 3 ° C./5° C. = 0.6 = 60% (hereinafter referred to as a third prior art). For example, Japanese Patent Application Laid-Open No. H05-331938 based on the application of Japanese Patent Application No. 3-331938 of the present applicant.
It is disclosed in, for example, JP-A-164438.

[0003]

The operation with such a gas burner requires indirect monitoring of the air-fuel ratio with a quick and accurate air ratio because the load factor frequently fluctuates depending on the operation state on the load side. However, even if the gas pressure / air pressure data as in the first prior art is converted to a moving average value as in the second prior art, the data does not become data related to the load factor. In response to the above, indirect monitoring of the air-fuel ratio cannot be performed with a quick and accurate air ratio, which causes a disadvantage that an unexpected accident may occur. For this reason, there is a problem that it is desired to provide a gas burner device without such inconvenience.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a gas burner device for calculating an air ratio based on the above gas pressure and air pressure and indirectly monitoring the air-fuel ratio. And data of the air pressure are stored in a storage unit that can store a predetermined number of data provided for each load factor,
When the memory of the storage unit is saturated, the average value of the stored data is calculated by the calculation unit to obtain the air ratio, and thereafter, every time new detection data of the gas pressure and the air pressure is stored in the storage unit. A first configuration in which a moving average value of stored data is calculated by a calculation unit to obtain an air ratio, and data of these air ratios is output;

[0005] In a gas burner apparatus for calculating an air ratio based on a gas pressure and an air pressure and indirectly monitoring an air-fuel ratio, data of the gas pressure and the air pressure detected every predetermined time are provided for each load factor. Is stored in a storage unit capable of storing the same number of data, and when the storage of this storage unit is saturated, the average value of the stored data is calculated by the calculation unit to obtain the air ratio. Each time new detection data of pressure is stored in the storage unit, the moving average value of the stored data is calculated by the calculation unit to obtain the air ratio, and these air ratios are compared with the set values to check for an inspection signal or abnormality. The above problem has been solved by the second configuration for outputting a signal.

[0006]

According to the gas burner device of the present invention, a quick and accurate air ratio can be obtained by the following operation. (1) Determine a data stock amount of gas pressure and air pressure for each load factor, for example, determine a predetermined number of data to be stored for these data, and output an average value when the stock amount of data becomes saturated. The input data of
Output as a moving average. (2) Prepare a 101 load ratio table divided into 1% from 0% to 100% load ratio, for example, a storage unit having a storage amount of the number of data for each load ratio. (3) As for the data of the gas pressure and the air pressure, the data collection is stopped while the control motor for gas or the control motor for air is operated by the control, and the data is collected when the control motors of both sides are stopped. That is, the data of the gas pressure and the air pressure detected at each of such predetermined time points is collected. (4) The data stock for each load factor is randomly filed during the control operation. For example, a storage unit corresponding to the load factor at that time is selected and stored. Is stored, the air ratio is calculated, and indirect monitoring of the air-fuel ratio is performed.

[0007]

Next, the present invention will be described in detail, but the present invention is not limited to the embodiments without departing from the gist of the present invention.
FIG. 1 shows a file prepared for each load factor, a data amount to be filed, that is, a storage unit for storing a predetermined number of data of gas pressure P _G and air pressure P _A , and an average value or moving average value P of gas pressure _GX, is an explanatory view of an air ratio calculation structure of the present invention showing the air pressure average value or moving average value P _AX, a relationship such as air ratio m _X. The load factor is calculated, for example, by calculating the load factor (%) in the third conventional technique. (1) Prepare a file for stocking the gas pressure P _G and the air pressure P _A for each load factor. For example, load factor 0%, 1
%, 2%... 101 files are prepared as files for every 100%. That is, the load factor is 0%, 1%,
2%... A storage unit corresponding to each of 100% is prepared. (2) Determine the amount of data to be stocked in each load factor file. For example, there is a table capable of filing 100 data volumes, and data is randomly filed during operation. That is, for each load factor, as the predetermined number of data, for example, with 100 data is provided to the storage unit that can store, gas pressure P _G, the data of the air pressure P _A, respectively, of the corresponding load factor storage unit To memorize.
Here, for example, if it is assumed that one data requires 200 ms, and data corresponding to the same load factor is continuously stored, 100 data is 20 seconds, and the storage unit of the load factor is stored in 20 seconds. Saturates. (3) When the data of the file is saturated, that is, when the memory of the storage unit is saturated, the average values P _GX and P _AX of the gas pressure and the air pressure are calculated and output, and thereafter, new data is stored. The moving average value P including the data
_GX and _PAX are calculated and output. (4) The air ratio m from the average value or moving average value P _GX , P _AX
Calculate _X.

FIG. 2 is an explanatory view of the gas burner device of the present invention except for a storage unit for performing the above-described storage and a calculation unit for performing the above-described calculation. The burner body 1, the blower 2, the air damper 3, It comprises a control motor 4, a mechanical linkage 7, a fuel control valve 5, a control motor 6, and the like. 8 is a gas pressure sensor and 9 is an air pressure sensor.

FIG. 3 shows a flow chart of the air ratio m calculation performed by the storage unit and the calculation unit. (1) The microcomputer stores the reference values g and a of the gas pressure P _GX and the air pressure P _AX corresponding to the load factor X (%), respectively. The reference values g and a and the constant K are, for example, values experimentally obtained by operating the apparatus in advance. (2) If a trouble occurs on the air side, P _GX , P
_If both _AX change and a trouble occurs on the gas side, P _AX does not change and P _GX changes, so the air ratio ma is calculated from P _AX by the following equation (1), and P _GX
The air ratio mg is calculated by the following equation (2). ma = K · [(P _AX /a)×{0.6+0.4×(P _AX / a)}] ^0.5 ... (1) K: Proper air ratio (constant) P _AX : Air pressure average value (mmH ₂₎ O) a: Reference value of air pressure P _A at each load (mmH ₂ O) And, when | P _AX −a | / X <0.06, mg = K / (P _GX / g) ² (2) ) K: proper air ratio (constant) P _GX: gas pressure average value (mmH ₂ O) g: the reference value of the gas pressure P _G in the load (mmH ₂ O)

(3) Further, ma and mg are compared to determine whether the trouble is on the gas side or on the air side, and which of ma and mg has a larger variation with respect to K (appropriate air ratio). m (air ratio). (4) Normal when m is 1.135 ≦ m ≦ 1.68. (5) m is 1.05 ≦ m ≦ 1.135 or 1.68 ≦ m
If ≦ 1.9, a check sign, that is, a check signal is output. That is, here, 1.05 ≦ and ≦ 1.13.
5, 1.68 ≦, and ≦ 1.9 are set values. (6) When m is m <1.05 or m> 1.9, an abnormal sign, that is, an abnormal stop signal is output to stop the combustion (safe stop). That is, here, <1.05,
> 1.9 is set as the set value. (7) The display indicates m or the oxygen concentration O ₂ (%) calculated by the following equation. O ₂ (%) = 21 × [(m−1) / {m− (0.21- (1 / 0.79 × f))}] f: Constant (theoretical dry combustion gas amount)

The arithmetic expression used to calculate ma and mg is one typical example, and the arithmetic expression differs depending on the shape and structure of the gas burner device. The P _A and P _G is can be regarded as a pressure difference, in which case also the arithmetic expression differs.

[0012]

According to the gas burner device of the present invention, indirect monitoring of the air-fuel ratio based on the air ratio is performed by storing a predetermined number of data of the gas pressure and the air pressure in the corresponding storage unit of the storage unit provided for each load factor. And the air-fuel ratio is indirectly monitored by calculating the air ratio based on the moving average value obtained from a predetermined number of data for each load factor. Even if it fluctuates frequently, it is possible to monitor the air-fuel ratio indirectly with a quick and accurate air ratio corresponding to the load factor, and to prevent an unexpected accident due to a poor air-fuel ratio. Also, the components required for that are simply provided with a storage unit for each load factor.
There is an advantage that a gas burner device that can achieve the above-described effects with a simple and inexpensive configuration can be provided.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and the contents of each drawing are as follows.

FIG. 1 is a block diagram of a main part.

FIG. 2 is a configuration diagram of a main part.

FIG. 3 is a flowchart of a main part calculation.

[Explanation of symbols]

P _G gas pressure P _A air pressure P _GX gas pressure average value / moving average value P _AX air pressure average value / moving average value X Load factor g Gas pressure reference value (set value) a Air pressure reference value (set value) Set value) ma · mg · m air ratio K proper air ratio f constant 1 burner body 2 blower 3 air damper 4.6 control motor 5 gas control valve 7 mechanical linkage 8 gas pressure sensor 9 air pressure sensor

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideki Uchida 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-5-118531 (JP, A) JP-A-4- 292701 (JP, A) JP-A-4-55615 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/18 F23N 5/18 101 F23N 1/02 F23N 5/24 101 F23N 5/24 104

Claims (2)

(57) [Claims] 1. A gas burner device for calculating an air ratio based on a gas pressure and an air pressure and indirectly monitoring an air-fuel ratio, wherein data of the gas pressure and the air pressure detected at predetermined time points are provided for each load factor. The stored data is stored in a storage unit capable of storing a predetermined number of data, and when the storage of the storage unit is saturated, the average value of the stored data is calculated by the calculation unit to obtain the air ratio. Each time new detection data of air pressure is stored in the storage unit, a moving average value of the stored data is calculated by the calculation unit to obtain an air ratio, and data of these air ratios is output. Gas burner device. 2. A gas burner device for calculating an air ratio based on a gas pressure and an air pressure and indirectly monitoring an air-fuel ratio, wherein data of the gas pressure and the air pressure detected at each predetermined time is provided for each load factor. The data is stored in a storage unit capable of storing a predetermined number of data, and when the storage of the storage unit is saturated, the average value of the stored data is calculated by the calculation unit to obtain the air ratio. Each time new detection data of air pressure and air pressure is stored in the storage unit, the moving average value of the stored data is calculated by the calculation unit to obtain the air ratio, and these air ratios are compared with the set values to check the inspection signal. Alternatively, a gas burner device that outputs an abnormal signal.