JP2594364B2 - Water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device provided with an adjusting means for adjusting a ratio between a fuel supply amount to a burner and a combustion air blowing amount to a set value.

[Conventional technology]

Conventionally, in the hot water supply device or the combustion device as described above, the ratio between the amount of fuel supplied and the amount of air blown for combustion, that is, the air-fuel ratio, regardless of the type in which the heating amount is variable and the type in which the heating amount is fixed, Is simply adjusted and maintained by the adjusting means to a value set in advance according to the fuel supply amount and the type of fuel to be used.

[Problems to be solved by the invention]

However, among the gas fuels generally called propane gas, there are two kinds of gas fuels, such as propane and butane, which have different calorific values but can be shared, and even with fuels used as the same kind, the calorific values due to compositional errors in the manufacturing process etc. Some fuels are slightly different.Furthermore, it is conceivable that different types of fuels, which are capable of burning but have different calorific values from the type of fuel to be used, are erroneously used. Naturally, different fuels require different amounts of air (the larger the amount of generated heat, the larger the required amount of air). However, in the conventional apparatus that merely adjusts and maintains the air-fuel ratio at a set value, the above-described heat generation is not possible. When fuels of different amounts and different required air amounts are introduced, the air-fuel ratio becomes inappropriate, which may lead to poor combustion.

In addition, by separately providing a calorimeter or the like, the calorific value of the fuel to be used is measured in advance before use, to prevent the use of a different kind of fuel other than the fuel type to be used, or based on the calorific value measured in advance. You can adjust the air-fuel ratio setting at
It is necessary to separately provide a calorimeter or the like, which may increase the size of the device and increase the manufacturing cost.

An object of the present invention is to efficiently and economically prevent poor combustion due to the introduction of fuels having different calorific values by adding a reasonable correction control configuration to a hot water supply temperature adjusting mechanism.

[Means for solving the problem]

The hot water supply apparatus according to the present invention includes a burner, a heat exchanger for heating water, a ventilation fan for supplying air for combustion, a hot water temperature sensor for detecting hot water temperature, and a hot water temperature sensor for detecting hot water temperature. And a water amount sensor for detecting a hot water supply amount or a water supply amount, and a hot water temperature setting means for setting a hot water temperature,
A hot water temperature adjusting section for adjusting the hot water temperature based on a deviation between the hot water temperature set by the hot water temperature setting means and the detected hot water temperature detected by the hot water temperature sensor; a fuel supply amount to the burner and combustion air Adjusting means for adjusting the ratio to the set air flow rate to a set value, wherein the hot water temperature adjusting section supplies a fuel supply amount calculated on the basis of a predetermined fuel type to be used in order to adjust the hot water supply temperature. Calculating means for calculating the deviation between the expected heating amount of the burner obtained as described above and the hot water supply temperature, the water supply temperature, and the actual heating amount calculated independently of the type of fuel used based on the hot water supply amount or the water supply amount. , And the arithmetic means (4
The correction means (4d) for correcting the ratio adjustment by the adjustment means (4b) according to the deviation (ΔQ) calculated in c) is provided, and the operation and effect are as follows.

(Operation)

In other words, if fuels with different calorific values are introduced, the amount of heating of the burner will also differ, so that the hot water temperature adjustment unit calculates the fuel supply amount calculated on the assumption of a predetermined fuel type to be used in order to adjust the hot water supply temperature. There is a deviation between the expected heating amount of the burner obtained when supplying the hot water and the hot water supply temperature, the water supply temperature, and the actual heating amount calculated based on the hot water supply amount or the water supply amount regardless of the type of fuel used. It is possible to determine that a fuel with a calorific value different from the expected calorific value has been introduced, and to determine whether the calorific value of the introduced fuel is positive or negative from the initial plan, depending on whether the deviation is positive or negative, and whether the deviation is large or small. It can be determined on which side and to what extent.

Since the required amount of air increases as the amount of heat generation increases, the correction means adds correction to the ratio adjustment (air-fuel ratio adjustment) by the adjustment means in accordance with the deviation calculated by the calculation means. In addition, the air-fuel ratio can be appropriately maintained irrespective of the introduction of fuels having different calorific values.

〔The invention's effect〕

As a result of the above, even if a different kind of fuel that is capable of burning but different from the type to be used is mistakenly used, regardless of the introduction of fuel with a different calorific value, automatic optimization of the air-fuel ratio based on the heating value deviation is achieved. A good combustion state can be obtained without artificial processing, and a combustion failure due to the introduction of fuel having a different calorific value can be prevented. , Safety can be greatly improved. Further, since the above heating amount deviation is obtained by calculation based only on the attribute value detected for adjusting the hot water supply temperature, a detecting means such as a calorimeter for previously measuring a heating value different depending on the fuel type is newly added. There is no need to provide it, and automatic optimization of the air-fuel ratio can be realized efficiently and economically.
High-performance, low-cost water heaters can now be provided.

〔Example〕

 Next, an embodiment will be described.

The drawing shows the device configuration of the water heater, (1) is a burner,
(2) is a fin tube type heat exchanger for water heating, (3)
Is a fan that blows combustion air, and (4) is a controller that controls operation.

The controller (4) receives the bath hot water supply command and receives the bath valve (5).
When the valve is opened and when the hot water tap (6) is opened, the fan (3) is started in response to the detection of the water amount of the water amount sensor (7) accompanying the valve opening / opening, and Hot water supply is started by opening the gas valve (8) and igniting the burner (1).

In response to the start of hot water supply, the hot water temperature adjusting unit (4a) incorporated in the controller (4) may set the hot water temperature (tx) (the set value may differ between the hot water supply for the bath and the hot water supply for the hot water tap (6)). ), Based on the detected water supply temperature (ti) detected by the water supply temperature sensor (9) and the detected water supply amount (Wi) detected by the water amount sensor (7), the required heating amount required for setting the hot water supply temperature to the set hot water supply temperature (tx) ( Qs), and based on the correlation between the heating amount (Q) preset according to the type of gaseous fuel used and the current (I) to the fuel regulating valve (10) comprising an electromagnetic proportional valve, Adjusting valve (1
0) is adjusted to a value (Is) corresponding to the required heating amount (Qs), and the fuel supply amount (G) to the burner (1) is adjusted to a value (Gs) corresponding to the required heating amount (Qs). ).

The hot water temperature adjusting section (4a) calculates a difference (Δt) between the hot water temperature (to) detected by the hot water temperature sensor (11) and the set hot water temperature (tx) with respect to the current (Is) adjusted as described above. The fuel supply amount (Gs) to the burner (1) is corrected (Gs → Gs ′) by adding a corresponding correction (Is → Is ′), whereby the hot water temperature is accurately adjusted to the set hot water temperature (tx). I do.

In response to the fuel supply amount adjustment as described above, the air flow amount adjustment unit (4) as air-fuel ratio adjustment means incorporated in the controller (4) is provided.
b) The air flow (V) of the fan (3) is based on the correlation between the current (I) and the air flow (V) for the fuel regulating valve (10) which is set in advance according to the type of gas fuel used. Is adjusted to the air flow (Vs ') corresponding to the current (Is') corrected according to the deviation (Δt) between the detected hot water supply temperature (to) and the set hot water supply temperature (tx), whereby the detected hot water supply temperature ( to) and the air supply ratio (air-fuel ratio) between the fuel supply amount (Gs ′) and the blown air amount (Vs ′) corrected according to the deviation (Δt) between the set hot water supply temperature (tx).

The controller (4) includes a heating amount deviation calculating unit (4c) and an air-fuel ratio correcting unit (4d) in addition to the hot water temperature adjusting unit (4a) and the air volume adjusting unit (4b) as air-fuel ratio adjusting means. ) Is installed, and the heating amount deviation calculation unit (4c) sets the detected hot water supply temperature (to) as the difference between the planned heating amount of the burner (1) and the actual heating amount for a fixed fuel supply amount. Hot water temperature (tx)
The heating amount (Qo ′) corresponding to the current (Is ′) corrected in accordance with the deviation (Δt) from the heating amount (Qo ′) and the detected hot water supply on the set correlation between the heating amount (Q) and the current (I). The detected hot water temperature (to) (or the set hot water temperature (tx)) and the detected hot water temperature (ti) under the condition that the correction according to the deviation (Δt) between the temperature (to) and the set hot water temperature (tx) is added. , And detected water supply (Wi)
The deviation (ΔQ) from the actual heating amount (Qo) calculated based on the above (corresponding to the required heating amount (Qs) calculated in the hot water temperature adjusting section (4a)) is calculated. The unit (4d) is a heating amount deviation calculation unit (4
Correction (Vs ′ → Vs ″) is added to the air volume adjustment (air-fuel ratio adjustment) by the air volume adjusting unit (4b) as the air-fuel ratio adjusting means according to the heating amount deviation (ΔQ) calculated in c).

Specifically, the air-fuel ratio correction unit (4d) calculates the actual heating amount (Q
o) is the heating amount (Qo ') as the expected heating amount obtained from the correspondence on the set correlation between the heating amount (Q) and the current (I).
The configuration is such that a correction is made to increase the blowing amount (Vs') as the value is larger.

In other words, the expected calorific value and the calorific value of the gas fuel to be used are different, and the required air amount is also different from the expected required air amount according to the difference in the calorific value. The correction of the air-fuel ratio adjustment based on the heating amount deviation (ΔQ) automatically optimizes the air-fuel ratio, thereby preventing poor combustion caused by the use of gas fuel whose calorific value differs from the expected calorific value. It is.

(Another embodiment)

 Next, another embodiment will be described.

(B) In the above-described embodiment, the configuration is such that the correction is made to the air supply amount adjustment side in accordance with the heating amount deviation (ΔQ). Instead, the correction may be made to the fuel supply amount adjustment side. Further, a configuration may be adopted in which correction is made to each of the air flow amount adjustment side and the fuel supply amount adjustment side.

(B) There are various specific calculation configurations for calculating the scheduled heating amount (Qo ') and the actual heating amount (Qo) of the burner (1) for a fixed fuel supply amount, and the deviation (ΔQ) thereof. Configuration changes are possible.

(C) The fuel is not limited to gas fuel,
Liquid fuel or solid fuel may be used.

(D) The present invention can be applied not only to a water heater but also to various types of combustion devices, and is not limited to a combustion device of a type in which the heating amount is variable, but also to a combustion device of a type in which the heating amount is fixed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawing is an apparatus configuration diagram of a water heater showing an embodiment of the present invention. (1) burner, (2) heat exchanger, (3) ventilating fan, (4a) hot water temperature adjustment unit, (4b) adjustment means, (4c) arithmetic means, (4d) ...... Correction means (7)
…… Water quantity sensor, (9) …… Feed water temperature sensor, (11) ……
Hot water temperature sensor.

Continuation of the front page (72) Inventor Yoshihisa Fujita 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka, Japan (72) Inventor Koji Mochiki 1-1-52, Oka, Minami-shi, Minato-ku, Osaka, Osaka In Herman (72) Kenji Aoki 1-1-52, Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Intra-Herman Co., Ltd. (72) Inventor Hirosao Iida 1-152, Oka, Minami-shi, Minato-ku, Osaka, Osaka Harman, Inc. (56) References JP-A-53-32427 (JP, A) JP-A-1-74447 (JP, U) JP-A-59-195359 (JP, U)

Claims (1)

(57) [Claims] 1. A burner (1), a heat exchanger (2) for heating water, a ventilation fan (3) for supplying combustion air,
Hot water temperature sensor (11) for detecting hot water temperature, hot water temperature sensor (9) for detecting hot water temperature, water amount sensor (7) for detecting hot water amount or hot water amount, and hot water temperature setting means for setting hot water temperature And a hot water temperature for adjusting the hot water temperature based on a deviation (Δt) between the hot water temperature (tx) set by the hot water temperature setting means and the hot water temperature (to) detected by the hot water temperature sensor (11). A hot water supply apparatus comprising: an adjusting unit (4a); and an adjusting unit (4b) that adjusts a ratio of a fuel supply amount to the burner (1) and a blowing amount of combustion air to a set value. The scheduled heating amount (Q) of the burner (1) obtained by supplying the fuel supply amount (Gs') calculated on the basis of the predetermined fuel type to be used by the temperature adjusting unit (4a) for adjusting the hot water supply temperature.
o ′) and a calculating means for calculating a deviation (ΔQ) between the hot water supply temperature, the water supply temperature, and the actual heating amount (Qo) calculated based on the hot water supply amount or the water supply amount independently of the type of fuel used. (Four
c) and a water heater provided with a correcting means (4d) for correcting the ratio adjustment by the adjusting means (4b) according to the deviation (ΔQ) calculated by the calculating means (4c).