JP2879909B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combustion amount designating means for designating a combustion amount, and an opening degree of an electromagnetic proportional valve for adjusting a combustion supply amount, which is specified by the combustion amount designation means. Valve control means for adjusting the opening degree according to
In addition, the present invention relates to a combustion device including a fan control unit that adjusts a blowing capacity of a fan that supplies combustion air to a blowing capacity according to a combustion amount designated by the combustion amount designation unit.

[Conventional technology]

Conventionally, in the above-described combustion apparatus, there has been provided a delay unit that delays transmission of a command from the combustion amount designating unit to the valve control unit when the designated combustion amount increases. (For example, Japanese Unexamined Patent Publication No. Sho 58-186883 and Japanese Utility Model Application No. Sho 54-143137
No. 61751)).

In other words, the adjustment of the blowing capacity to the increasing side has a considerably slower response than the adjustment of the opening of the proportional solenoid valve to the increasing side due to the inherent characteristics of the fan due to the blowing resistance, the rotor inertia, etc. The response can be made somewhat faster by using a powerful motor, but if a powerful motor is used, the cost of power will be high.) The air-fuel ratio at the time of the transition to the increase of the combustion amount (specifically, at the time of the transition to the increase of the blowing capacity with respect to the increase of the specified combustion amount) by intentionally delaying the opening adjustment to the increase side It is intended to suppress the deterioration of.

[Problems to be solved by the invention]

However, if the designated transmission from the combustion amount designating means to the valve control means is simply delayed by the delay means as described above when the designated combustion amount increases, the deterioration of the air-fuel ratio during the transition to the increase in the combustion amount is still insufficient. Could not be controlled, and there was room for improvement in this regard. In particular, when the designated combustion amount is greatly changed, the deterioration of the air-fuel ratio is inevitable. To add an explanation, if the specified combustion amount is significantly changed, it will take a relatively long time before the fan's blowing capacity is adjusted to the blowing capacity according to the changed specified combustion amount. Simply delaying the designated transmission from the quantity designating means to the valve control means for a set time only after the set time has elapsed and the adjustment of the valve control means to the increasing side has been performed, but the air blowing capacity of the fan is still at the designated combustion. The air-fuel ratio does not reach the blowing capacity according to the amount, and after that point, the air-fuel ratio deteriorates.

An object of the present invention is to effectively prevent the air-fuel ratio from deteriorating at the time of a change transition even when the combustion amount is largely changed to an increase side by a reasonable and simple control configuration. On the point.

[Means for solving the problem]

A first characteristic configuration of the combustion device according to the present invention is that an opening degree of a combustion amount designating means for designating a combustion amount and an opening degree of an electromagnetic proportional valve for adjusting a fuel supply amount according to the combustion amount designated by the combustion amount designating means. A valve control unit for adjusting the air supply capacity of the fan, and a fan control unit for adjusting the air supply capacity of the fan for supplying the combustion air to the air supply capacity according to the combustion amount designated by the combustion amount designation means. In the opening increase adjustment of the electromagnetic proportional valve, in a state where the opening increase speed up to the opening corresponding to the combustion amount specified by the combustion amount designating means is set to a speed corresponding to the air blowing capability increase speed of the fan. That is, the opening degree is gradually increased from the point of time when the designated combustion amount increases.

Further, a second characteristic configuration of the combustion device according to the present invention specifies a configuration suitable for implementing the above-mentioned first characteristic configuration, wherein the valve control means is used for adjusting the opening degree of the electromagnetic proportional valve. The configuration is such that the opening is gradually increased by an intermittent opening increasing operation.

[Action]

 The operation of the above-mentioned first characteristic configuration is as follows.

That is, in the first characteristic configuration, the speed that is set in advance with respect to the opening increase speed up to the opening corresponding to the combustion amount designated by the combustion amount designation means is a speed that matches the fan performance increasing speed on the original characteristic of the fan. In the adjustment of the opening of the solenoid proportional valve to increase the designated combustion amount,
With the opening degree increasing speed defined at the set speed, the valve control means gradually increases the opening degree of the solenoid proportional valve from the point of increase and change of the designated combustion amount, so that the fan starts from the point of increase and change of the designated combustion amount. Of the electromagnetic proportional valve and the opening of the proportional solenoid valve are increased in synchronization with each other, so that the blowing ability and the opening corresponding to the designated combustion amount can be respectively reached.

〔The invention's effect〕

As a result, for example, even when the designated combustion amount is greatly changed to the increased side, the designated combustion amount is increased in the entire transition period in the adjustment of the blowing capacity to the increased side with respect to the increase in the designated combustion amount. By increasing the air blowing capacity of the fan and the opening of the electromagnetic proportional valve in synchronization with each other from the time of the change, it is possible to more effectively prevent the air-fuel ratio from deteriorating at the time of the transition to the increase in the combustion amount. Reached.

By the way, in order to increase the fan blowing capacity and the opening of the electromagnetic proportional valve in synchronization with the increase of the designated combustion amount, the fan blowing capacity (for example, the number of revolutions) is detected successively during the increase adjustment transition. Based on this detection result, it is conceivable to adjust the opening of the proportional solenoid valve so that the increase in the opening of the proportional solenoid valve is synchronized with the increase in the blowing capacity. Since information is required, the control configuration becomes complicated.

In this regard, according to the first characteristic configuration of the present invention, there is an advantage that the control configuration can be simplified because the detection information of the blowing ability is unnecessary.

When the first characteristic configuration of the present invention is implemented, if the above-described second characteristic configuration is employed, the operation of increasing the opening of the electromagnetic proportional valve may be intermittent. It is advantageous when this opening degree increase adjustment control is performed by a microcomputer which also serves as another control, as compared with the case where the adjustment operation type for increasing the number is adopted.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a hot water supply device as an example of a combustion device,
(1) is a heat exchanger for heating water, (2) is a heat exchanger (1)
This is a burner that heats the burner. A bypass (5) branched from a water supply path (4) to the heat exchanger (1) is connected to a hot water supply path (3) from the heat exchanger (1).

(6) a water amount sensor for detecting the amount of water supplied to the heat exchanger (1); (7) a water temperature correction water valve for automatically adjusting the amount of water supplied to the heat exchanger (1) according to the supplied water temperature; ) Is a hot water supply temperature sensor for detecting the hot water supply temperature from the heat exchanger (1), (10) is a hot water tap, and (11) is a bypass solenoid valve that opens and closes a bypass passage (5) to prevent after-boiling. .

(12) is a gas valve for intermittently supplying fuel gas to the burner (2), (13) is an electromagnetic proportional valve for adjusting the amount of fuel gas supplied to the burner (2), and (14) is a spark plug.

Further, (16) is a fan for supplying combustion air to the burner (2), (17) is a rotation speed detecting means for detecting the rotation speed of the fan (16), and (18) is a wind pressure switch.

(19) is a controller for executing operation control. This controller (19) basically performs a hot water supply operation start / stop control, and when the tap (10) is opened, the water flow sensor (6)
Activates the fan (16) in response to the water volume detection state, and the wind pressure switch (18)
In response to the ON, the gas valve (12) is opened and the spark plug (14) is activated by a spark to ignite the burner (2), thereby starting hot water supply.

On the other hand, when the tap (10) is closed, in response to the water amount sensor (6) being in the water amount non-detection state,
The gas valve (12) is closed to extinguish the burner (2) and the fan (16) is stopped.

The controller (19) incorporates a combustion control means (21) having a block configuration as shown in FIG. 2, and the combustion control means (21) includes a combustion amount designation means (22) and a fan control means ( 23) and valve control means (24).

The combustion amount designating means (22) includes a set hot water temperature (tx) set by the setting device (20), a stored hot water temperature (a hot water temperature detected by the hot water temperature sensor (8) in the previous hot water operation (to),
Water supply amount (wi) detected by water amount sensor (6) and water supply temperature calculated based on combustion amount) and water amount sensor (6)
The amount of combustion required for setting the hot water temperature to the set hot water temperature (tx) is calculated based on the detected hot water supply amount (wi), and the hot water temperature detected by the hot water temperature sensor (8) (to) and the set hot water temperature (tx) are calculated. ) Is corrected based on the deviation of the calculated combustion amount, and the corrected combustion amount is designated for each of the fan control means (23) and the valve control means (24).

The fan control means (23) adjusts the number of revolutions of the fan (16) as a combustion amount designation means (22)
The fan speed is adjusted to the rotation speed according to the designated combustion amount from the fan. The fan rotation speed designation unit (25) for designating the rotation speed of the fan (16) according to the designated combustion amount, and the rotation speed detection unit (1
And a fan driving means (26) for adjusting the rotation speed of the fan (16) to a specified rotation speed while feeding back the rotation speed detected by the method (7).

The valve control means (24) adjusts the opening of the electromagnetic proportional valve (13) to an opening corresponding to the designated combustion amount from the combustion amount designation means (22). Valve (13)
And a valve driving means (28) for adjusting the opening of the proportional solenoid valve (13) to the specified opening.

That is, by the control configuration as described above, the combustion amount of the burner (2) is adjusted to adjust the hot water temperature to the set hot water temperature (tx),
Further, the air-fuel ratio is adjusted to an appropriate value regardless of the combustion amount adjustment.

The valve control means (24) adjusts the opening degree of the electromagnetic proportional valve (13) with respect to the increase of the designated combustion amount to an opening degree up to an opening degree corresponding to the designated combustion amount as a fan blowing ability increase speed. In accordance with the specified amount of combustion, the opening of the proportional solenoid valve (13) is gradually increased from the point of time when the specified amount of combustion increases, with the fan specified at a speed that matches the rotational speed increase speed in the original characteristics of the fan. The valve drive means (28) in the valve control means (24) is used to adjust the opening of the electromagnetic proportional valve (13). The opening degree of the electromagnetic proportional valve (13) is indicated by B in FIG. 3 by intermittently executing the operation of increasing the opening degree up to the designated opening degree by the valve opening degree designating means (27). As described above, the above transient control is executed by increasing stepwise. It is constituted.

That is, when the above-described transient control is not performed, the rotation speed adjustment (indicated by C in FIG. 3) of the fan (16) increases due to the inherent characteristics of the fan (16) due to the increase of the electromagnetic proportional valve (13). Due to the fact that the response is much slower than the opening degree adjustment to the side (indicated by A in FIG. 3), when the change in the combustion amount to the increase side (specifically, the designated combustion The air-fuel ratio deviates from an appropriate value and deteriorates during the adjustment transition of the rotation speed of the fan (16) to the increase side with respect to the increase in the amount. This is prevented throughout the transition period.

(Another embodiment)

 Next, another embodiment of the present invention will be described.

(B) In the above-described embodiment, the opening degree of the electromagnetic proportional valve (13) is intermittently increased to regulate the opening increasing speed up to the opening degree corresponding to the designated combustion amount. Instead, the solenoid proportional valve (1) is operated under the condition that the opening increase speed up to the opening corresponding to the designated combustion amount is set to a preset speed.
A configuration in which the opening degree of 3) is continuously increased may be adopted.

(B) In the above-described embodiment, by gradually increasing the designated opening given from the valve opening designation means (27) to the valve driving means (28) to an opening corresponding to the designated combustion amount, the opening increase speed is increased. May be configured to gradually increase the opening degree of the electromagnetic proportional valve (13) in a state where is defined.

(C) The specified value of the opening degree increasing speed may be changed according to the change width of the combustion amount, and the specified value may be changed with the lapse of time at the time of adjusting the blowing capacity of the fan (16). It is good also as a structure to make it.

(D) The adjustment of the blowing capacity of the fan (16) is not limited to the rotation speed control, but may be a current control type, a voltage control type, or the like.

(E) Regarding the adjustment to decrease the opening of the electromagnetic proportional valve (13) with respect to the decrease in the designated combustion amount, if necessary, the opening decrease speed up to the opening corresponding to the designated combustion amount may be set to a preset speed. In the specified state, a configuration may be employed in which the opening of the electromagnetic proportional valve (13) is gradually reduced from the point of time when the designated combustion amount decreases.

(F) The present invention is applicable not only to a hot water supply apparatus but also to various combustion apparatuses.

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]

1 to 3 show an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a hot water supply device, FIG. 2 is a block diagram showing a configuration of a combustion control means, and FIG. It is a graph which shows a degree increasing operation form. (13)… Proportional solenoid valve, (16)… Fan, (22)…
Combustion amount designating means (23) ... Fan control means (24) ...
... Valve control means.

Continued on the front page (72) Inventor Naomi Tanaka 1-1-52 Minami-shioka, Minato-ku, Osaka-shi, Osaka Prefecture Inside Herman Co., Ltd. (72) Inventor Toshiharu Kataoka 1-1-52 Minami-shika, Minami-shi, Minato-ku, Osaka, Osaka Stock (72) Inventor: Etsuko Omote 1-15-1 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Hermani Co., Ltd. (56) References JP-A-58-1868813 (JP, A) JP-A-63-271022 ( JP, A) Japanese Utility Model Showa 61-170964 (JP, U) Japanese Utility Model Showa 56-61751 (JP, U) Japanese Utility Model Showa 61-34342 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , (DB name) F23N 1/02 F23N 5/00

Claims (2)

(57) [Claims] A combustion amount designating means for designating a combustion amount;
Valve control means (24) for adjusting the opening of the electromagnetic proportional valve (13) for adjusting the fuel supply to an opening corresponding to the combustion quantity designated by the combustion quantity designating means (22), and supplying combustion air A fan control means (23) for adjusting a blowing capacity of a fan (16) to be blown to a blowing capacity according to a combustion amount designated by the combustion amount designating means (22), wherein the valve control means (24) In the adjustment of the opening of the electromagnetic proportional valve (13), the opening increasing speed up to the opening corresponding to the combustion amount designated by the combustion amount designating means (22) is determined by the blowing capacity of the fan (16). A combustion device having a configuration in which the opening is gradually increased from a point in time at which a designated combustion amount increases in a state where the speed is specified to a speed corresponding to the increasing speed. 2. The valve control means (24) is configured to increase the opening in a stepwise manner by an intermittent opening increase operation in adjusting the opening of the electromagnetic proportional valve (13). Combustion equipment.