JPS645214B2 - - Google Patents
Info
- Publication number
- JPS645214B2 JPS645214B2 JP57055092A JP5509282A JPS645214B2 JP S645214 B2 JPS645214 B2 JP S645214B2 JP 57055092 A JP57055092 A JP 57055092A JP 5509282 A JP5509282 A JP 5509282A JP S645214 B2 JPS645214 B2 JP S645214B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- amount
- temperature
- water
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 58
- 230000007423 decrease Effects 0.000 description 10
- 230000004397 blinking Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 230000004043 responsiveness Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/082—Regulating fuel supply conjointly with another medium, e.g. boiler water using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/18—Measuring temperature feedwater temperature
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Description
【発明の詳細な説明】
本発明は入力量に応じてガスバーナの燃焼量を
比例的に制御するガス比例弁を用いて、負荷の温
度を設定した一定温度に維持するようにした湯沸
器、ガス温風機等の加熱装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a water heater that maintains the load temperature at a preset constant temperature using a gas proportional valve that proportionally controls the combustion amount of a gas burner according to the input amount; This relates to heating devices such as gas hot air blowers.
従来のこの種加熱装置には給湯或るいは温風の
温度に基づいてガス比例弁を制御するいわゆるフ
イードバツク制御と、水量、給水温度或るいは風
量、風温等に基づいてガス比例弁を制御するフイ
ードフオワード制御とがあつた。 Conventional heating devices of this type include so-called feedback control, which controls a gas proportional valve based on the temperature of hot water or hot air, and a feedback control, which controls a gas proportional valve based on water volume, water supply temperature, air volume, air temperature, etc. There was a feed forward control.
第1図はフイードバツク制御の湯沸器に於ける
適用例を示したもので、1は熱交換器、2はガス
バーナ、3はガスバーナ2のガス供給路4中に設
けたガス比例弁、5は熱交換器1の下流の給湯路
6に設けた湯温検出器、7は温度設定器、8は比
例制御部である。又ガスバーナには一般的にリフ
テイングや不側の消火を招来する最小燃焼量があ
つて絞り可能範囲があり従つて湯沸器の出湯能力
のターンダウンをある限度以下まで求められる場
合には当該最小燃焼量に見合う比例出力以下では
ガスバーナを消火せしめ、比例出力が最小燃焼量
に見合う出力を越えると再びガスバーナを着火せ
しめる点滅制御を採用して解決している。これを
第2図に基づいて説明する。湯温が上昇するに従
つて比例制御部8からの比例出力は減少し、ガス
量が減少する。ガス量がガスバーナ2の最小燃焼
量Aまで減少するとガス比例弁3が全閉或るいは
別に設けた電磁弁が閉塞してガスバーナ2が消火
する。バーナの消火により湯温は次第に低下し、
この低下に伴ない比例制御部8からの出力は増加
し、該出力が最小燃焼量Aに見合う出力になれば
再びガスバーナ2が着火する。このように点滅制
御と絞り制御とを組合せることにより広範囲の湯
温制御を可能にしている。ところがこのフイード
バツク制御では、外乱の変化に対する湯温検出器
の不感応時間(遅れ時間)が長く、変化に対する
過渡特性が問題となる。 Figure 1 shows an example of application of feedback control to a water heater, in which 1 is a heat exchanger, 2 is a gas burner, 3 is a gas proportional valve installed in the gas supply path 4 of the gas burner 2, and 5 is a gas proportional valve installed in the gas supply path 4 of the gas burner 2. A hot water temperature detector is provided in a hot water supply path 6 downstream of the heat exchanger 1, 7 is a temperature setting device, and 8 is a proportional control section. Additionally, gas burners generally have a minimum combustion amount that can lead to lifting and extinguishing fires, and there is a range in which they can be throttled. This problem is solved by adopting blinking control that extinguishes the gas burner when the proportional output is less than the proportional output commensurate with the combustion quantity, and ignites the gas burner again when the proportional output exceeds the output commensurate with the minimum combustion quantity. This will be explained based on FIG. As the water temperature rises, the proportional output from the proportional control section 8 decreases, and the gas amount decreases. When the gas amount decreases to the minimum combustion amount A of the gas burner 2, the gas proportional valve 3 is fully closed or a separately provided electromagnetic valve is closed, and the gas burner 2 is extinguished. As the burner is extinguished, the water temperature gradually decreases.
As the output decreases, the output from the proportional control section 8 increases, and when the output corresponds to the minimum combustion amount A, the gas burner 2 is ignited again. By combining flashing control and throttling control in this way, it is possible to control the hot water temperature over a wide range. However, with this feedback control, the insensitivity time (delay time) of the hot water temperature detector to changes in disturbance is long, and transient characteristics with respect to changes become a problem.
対するフイードフオワード制御は第3図に示し
た如く熱交換器1への給水路9に給水温検出器1
0と、水量検出器11とを設け、比例制御部8で
は設定温度から給水温検出器10で検出した給水
温度を減算した後水量検出器11の検出した水量
を乗算してガス比例弁3に出力してある。このフ
イードフアワード制御では外乱の変化に対する遅
れ時間が極めて少なく応答性はフイードバツク制
御に対して著しく良好である。ところがフイード
フオワード制御では上述したガスバーナのリフテ
イング、消火を防止すべく一定出力以下でガスバ
ーナを消火せしめるようにすれば、例えばその時
の条件が続く間はガスバーナを着火させることが
出来ず(第4図)、点滅制御が行えない為湯温は
低下し続けて湯温制御は狭い範囲でしか行えなか
つた。 As shown in FIG.
0 and a water flow rate detector 11 are provided, and the proportional control unit 8 subtracts the water supply temperature detected by the water supply temperature detector 10 from the set temperature, and then multiplies the water flow rate detected by the water flow rate detector 11. It has been output. In this feedback control, the delay time to a change in disturbance is extremely small, and the responsiveness is significantly better than that in feedback control. However, in feed forward control, if the gas burner is extinguished below a certain output in order to prevent lifting and extinguishing of the gas burner as described above, for example, the gas burner cannot be ignited while the current condition continues (4. (Figure), because flashing control could not be performed, the water temperature continued to drop, and water temperature control could only be performed within a narrow range.
本発明は上述した従来例の問題点を解決せんと
するもので、ガスバーナが最小燃焼量以上の絞り
可能範囲ある場合は主としてフイードフオワード
制御により絞り制御を行ない、ガスバーナの最小
燃焼量にまでガス比例弁が絞られ絞り可能範囲外
になるとフイードバツク制御に切換えて点滅制御
を行わしめ、過渡特性の良い、又広範囲の温度制
御が行える加熱装置を提供せんとするものであ
る。 The present invention aims to solve the above-mentioned problems of the conventional method.When the gas burner has a range in which the gas burner can be throttled beyond the minimum combustion amount, throttle control is performed mainly by feedforward control, and the gas burner reaches the minimum combustion amount. It is an object of the present invention to provide a heating device which has good transient characteristics and can perform temperature control over a wide range by switching to feedback control and performing blinking control when the gas proportional valve is throttled and goes out of the throttleable range.
以下に本発明を瞬間湯沸器に実施した例につい
て説明する。 An example in which the present invention is applied to an instantaneous water heater will be described below.
21は熱交換器、22はガスバーナ、23はガ
スバーナ22のガス供給路24に設けたガス比例
弁、25は熱交換器21下流の給湯路26に設け
た湯温検出器で被加熱流体の温度即ち湯温を検出
する。27は熱交換器21上流の給水路28に設
けた給水温検出器で、該検出器により熱交換器2
1に向う流体の温度即ち給水温を検出するもので
ある。29は水量検出器であり流体流量即ち水量
を検出するものである。30は温度設定器であ
る。31は温度設定器30の設定温度から給水温
検出器27で検出した給水温度を減算し、水量検
出器29で検出した水量を乗算し、得られた演算
量の大小により絞り可能範囲にあるか否かを判別
し後述するスイツチ32を切換える制御部であ
る。33は湯温検出器25からの湯温と温度設定
器30の設定温度を比較して比例、積分或るいは
微分と共に組合せてガスバーナ22の最小燃焼量
以下では点滅制御を行うようにしたガス比例弁2
3等を制御する第1の制御部である。34は制御
部31と同様の演算を行ない、又本実施例に示し
た如く湯温を外乱(測定誤差、ガス比重の変化)
に対する補正用の制御要素とした絞り制御を行な
う第2の制御部である。又制御部31によるスイ
ツチ32の切換えは、当該制御部31の演算出力
がガスバーナ22の最小燃焼量以上の絞り可能範
囲にある場合は第2の制御部34を、最小燃焼量
以下の絞り範囲外の場合は第1の制御部33をガ
ス比例弁23等に接続するようにしてある。尚ス
イツチ32は本実施例で示した機械的なものに限
られず、電気的に切換るものでもよい。又第1の
制御部33は限らずしもガス比例弁23のみを制
御しなくてもよく、別に設けたON−OFF型の電
磁弁(図示せず)と共に制御するようにしてもよ
い。 21 is a heat exchanger, 22 is a gas burner, 23 is a gas proportional valve provided in the gas supply path 24 of the gas burner 22, and 25 is a hot water temperature detector provided in the hot water supply path 26 downstream of the heat exchanger 21, which measures the temperature of the fluid to be heated. That is, the water temperature is detected. 27 is a feed water temperature detector installed in the water supply channel 28 upstream of the heat exchanger 21;
This is to detect the temperature of the fluid flowing toward the water supply point 1, that is, the temperature of the water supply. Reference numeral 29 is a water amount detector which detects the fluid flow rate, that is, the amount of water. 30 is a temperature setting device. 31 subtracts the feed water temperature detected by the feed water temperature detector 27 from the set temperature of the temperature setting device 30, multiplies it by the amount of water detected by the water amount detector 29, and determines whether or not it is within the throttling possible range based on the amount of calculation obtained. This is a control section that determines whether or not the switch is on and switches a switch 32, which will be described later. 33 is a gas proportional system which compares the hot water temperature from the hot water temperature detector 25 and the set temperature of the temperature setting device 30 and performs blinking control when the minimum combustion amount of the gas burner 22 is lower than the minimum combustion amount by combining the results with proportional, integral or differential information. valve 2
This is the first control section that controls the third and the like. 34 performs the same calculation as the control unit 31, and also disturbs the water temperature (measurement error, change in gas specific gravity) as shown in this embodiment.
This is a second control section that performs aperture control as a control element for correction. Furthermore, when the control unit 31 switches the switch 32, if the calculated output of the control unit 31 is within the throttleable range that is greater than or equal to the minimum combustion amount of the gas burner 22, the second control unit 34 is switched to a state that is outside the throttleable range that is less than or equal to the minimum combustion amount. In this case, the first control section 33 is connected to the gas proportional valve 23 or the like. Note that the switch 32 is not limited to the mechanical type shown in this embodiment, but may be an electrical type. Further, the first control section 33 does not necessarily have to control only the gas proportional valve 23, but may control it together with a separately provided ON-OFF type solenoid valve (not shown).
本発明は以上の構成よりなり、給湯栓を開いて
熱交換器21に通水すると、先ず制御部31に給
水温度と水量の検出信号が入力され、当該制御部
31で(設定温度−給水温度)×入水量の演算が
行われる。この演算出力がガスバーナの最小燃焼
量以上の絞り可能範囲にある場合は第2の制御部
34がガス比例弁23に接続され、ガス比例弁2
3は第2の制御部34により給水温度並びに水量
の変化に応じて比例的に絞り制御され、出湯温度
は設定した一定温度に維持される。この時給水温
度が上昇し、又水量が減少するとガス比例弁23
の入力量は徐々に減少してガス量が絞られ、ガス
量がガスバーナ22の最小燃焼量にまで絞られる
と制御部31によりスイツチ32が切換えられ
て、第1の制御部33によりガス比例弁23等が
制御されることになる。 The present invention has the above-described configuration. When the hot water tap is opened and water is passed through the heat exchanger 21, first, detection signals of the water supply temperature and water amount are input to the control unit 31, and the control unit 31 outputs (set temperature - water supply temperature) ) x amount of water inflow is calculated. If this calculation output is within the throttleable range equal to or greater than the minimum combustion amount of the gas burner, the second control section 34 is connected to the gas proportional valve 23, and the gas proportional valve 2 is connected to the gas proportional valve 23.
3 is throttled proportionally by the second control unit 34 according to changes in the water supply temperature and water amount, and the hot water temperature is maintained at a set constant temperature. At this time, if the water supply temperature rises and the water amount decreases, the gas proportional valve 23
The input amount gradually decreases to throttle the gas amount, and when the gas amount is throttled down to the minimum combustion amount of the gas burner 22, the control section 31 switches the switch 32, and the first control section 33 switches the gas proportional valve. 23 etc. will be controlled.
この関係を第6図に基づいて説明する。水量が
何らかの原因で減少すると、第2の制御部34に
よりガス量は水量の減少に比例して絞られる。そ
して水量が一定水量Wo以下に減少してその水量
が継続して熱交換器21に流れる条件を考える。
尚上記一定水量Woはそのとき第2の制御部34
によりガス比例弁23が絞られたガス量がガスバ
ーナ22の最小燃焼量Goに相当するものとする。
従つて当該ガス量Goに絞られた時制御部31が
スイツチ32を切換えて、第1の制御部33がガ
ス比例弁23等を制御することになる。そして第
1の制御部33で湯温を検出して設定温度との比
較によりガス比例弁23を制御し、ガス比例弁2
3の入力量がガス量Goに相当する設定値以上に
なればガスバーナ22を着火せしめ、又設定値以
下になれば消火せしめて湯温は略一定に制御され
るのである。即ち以上述べたように本発明でガス
バーナ22の最小燃焼量以上の絞り可能範囲では
第2の制御部34によりフイードフオワード制御
で絞り制御を、又設定値以下では第1の制御部3
3によりフイードバツク制御で点滅制御を行うの
である。 This relationship will be explained based on FIG. When the amount of water decreases for some reason, the second control section 34 throttles the amount of gas in proportion to the decrease in the amount of water. Then, consider a condition in which the amount of water decreases below a certain amount of water Wo and the amount of water continues to flow to the heat exchanger 21.
In addition, the above-mentioned constant water amount Wo is then controlled by the second control section 34.
It is assumed that the amount of gas throttled by the gas proportional valve 23 corresponds to the minimum combustion amount Go of the gas burner 22.
Therefore, when the gas amount is reduced to the gas amount Go, the control section 31 switches the switch 32, and the first control section 33 controls the gas proportional valve 23 and the like. Then, the first control unit 33 detects the hot water temperature and controls the gas proportional valve 23 by comparing it with the set temperature.
When the input amount of No. 3 exceeds a set value corresponding to the gas amount Go, the gas burner 22 is ignited, and when it falls below the set value, it is extinguished, and the water temperature is controlled to be approximately constant. That is, as described above, in the present invention, the throttle control is performed by the second control section 34 using feedforward control in the throttleable range of the gas burner 22 exceeding the minimum combustion amount, and the throttle control is performed by the first control section 3 below the set value.
3, the blinking control is performed by feedback control.
従つて本発明によれば外乱の変化に対して遅れ
時間が極めて少なく、応答性、過渡特性が良好が
良好となり又広範囲の温度制御が行なえ、極めて
有用な加熱装置を提供できるのである。 Therefore, according to the present invention, the delay time with respect to changes in disturbance is extremely small, the responsiveness and transient characteristics are excellent, and the temperature can be controlled over a wide range, making it possible to provide an extremely useful heating device.
第1図、第3図は従来例の湯沸器の構成図、第
2図、第4図は同従来例における説明図、第5図
は本発明を湯沸器に実施した構成図、第6図は同
湯沸器における説明図である。
21……熱交換器、22……ガスバーナ、23
……ガス比例弁、33……第1の制御部、34…
…第2の制御部。
1 and 3 are block diagrams of a conventional water heater, FIGS. 2 and 4 are explanatory diagrams of the conventional water heater, and FIG. 5 is a block diagram of a water heater in which the present invention is implemented. FIG. 6 is an explanatory diagram of the water heater. 21...Heat exchanger, 22...Gas burner, 23
...Gas proportional valve, 33...First control section, 34...
...Second control unit.
Claims (1)
ガスバーナの燃焼量を比例的に制御するガス比例
弁と、被加熱流体の温度に基づいてガス量を制御
する第1の制御部と、熱交換器に向う流体の温度
並びに流量に基づきガス比例弁を絞り制御する第
2の制御部とを備え、上記ガスバーナの絞り可能
範囲では第2の制御部により、その範囲以下では
第1の制御部によりガス量を制御するようにした
ことを特徴とする加熱装置。1 A heat exchanger, a gas burner, a gas proportional valve that proportionally controls the combustion amount of the gas burner according to the input amount, a first control section that controls the gas amount based on the temperature of the heated fluid, and a second control section that throttles and controls the gas proportional valve based on the temperature and flow rate of the fluid heading to the exchanger, and the second control section controls the gas proportional valve within the throttleable range of the gas burner, and the first control section below that range. A heating device characterized in that the amount of gas is controlled by.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57055092A JPS58173314A (en) | 1982-04-01 | 1982-04-01 | Heating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57055092A JPS58173314A (en) | 1982-04-01 | 1982-04-01 | Heating device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58173314A JPS58173314A (en) | 1983-10-12 |
JPS645214B2 true JPS645214B2 (en) | 1989-01-30 |
Family
ID=12989087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57055092A Granted JPS58173314A (en) | 1982-04-01 | 1982-04-01 | Heating device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58173314A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60142115A (en) * | 1983-12-28 | 1985-07-27 | Matsushita Electric Ind Co Ltd | Controlling device of temperature of hot water feeder |
FR2563912B1 (en) * | 1984-05-02 | 1990-01-05 | Vaillant Sarl | DEVICE FOR MEASURING THE LOAD OF A HEAT SOURCE HEATED BY A FUEL AND PROVIDED WITH A HEAT EXCHANGER, AND REGULATION THEREOF |
JPS60194242U (en) * | 1984-05-31 | 1985-12-24 | 東陶機器株式会社 | Gas instant water heater |
-
1982
- 1982-04-01 JP JP57055092A patent/JPS58173314A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS58173314A (en) | 1983-10-12 |
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