JP2000274673A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a combustion device that the dew is not formed at a fluid heater even if the temperature of the liquid within a liquid heater such as a hot water supply heat exchanger or the like is low. SOLUTION: Dew condensation on a hot water supply heat exchanger is controlled by giving a data storage 10 beforehand the first fan revolution control data to control the number of revolutions of a combustion fan 5, according to the requested calorific value of a burner, when the water temperature (hot water temperature) within the hot water supply heat exchanger detected with a hot water supply heat exchanger hot water sensor 6 is above the preset reference temperature, and the second fan revolution control data to control the number of revolutions of the combustion fan 5 to the side of up of the quantity or air, according to the requested calorific value of combustion of the burner, when the water temperature is lower than the reference temperature, and performing the revolution control of the combustion fan 5 by a number-of- revolutions-of-fan control means 8, based on the first revolution control data, when the water temperature is above the reference, and based on the second revolution control data, when the water temperature is lower than the reference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a water heater or a cooling / heating device.

[0002]

2. Description of the Related Art FIG. 6 is a model diagram showing an example of a water heater as a combustion device. This water heater (apparatus) has a burner 1 in an appliance case 40, a fuel supply passage 42 for supplying fuel to the burner 1 is connected to the burner 1, and a fuel supply passage 42 for supplying fuel to the burner 1 is connected to the fuel supply passage 42. Supply
A closing / closing valve 43 for controlling the stop and a proportional valve 4 for controlling the amount of fuel supplied to the burner 1 by the valve opening.
4 are interposed. A combustion fan 5 for supplying and exhausting the combustion of the burner 1 is provided below the burner 1.

[0003] Above the burner 1, there is provided a hot water supply heat exchanger 4 as a liquid heater through which water, which is a liquid, flows, and on the input side of the hot water supply heat exchanger 4 is provided.
A water supply passage 46 for guiding water from a water supply source is connected to the hot water supply heat exchanger 4, and a hot water supply passage 47 is connected to the outlet side of the hot water supply heat exchanger 4. The burner 1 functions as heating means for heating water in the hot water supply heat exchanger 4, and the hot water supply heat exchanger 4 heats the water supplied from the water supply passage 46 by the heat of the burner combustion flame. And sends out the hot water to the hot water supply passage 47. Hot water produced by the hot water supply heat exchanger 4 is supplied to a desired hot water supply place through a hot water supply passage 47.

FIG. 6 shows the system configuration of the hot water supply system, and therefore the hot water supply heat exchanger 4 is shown in a straight line. However, the hot water supply heat exchanger 4 is generally shown in FIG. As described above, a curved pipe formed by folding back at the folded portion 7 and formed in a plurality of stages is provided, and the pipe is formed by passing through the plurality of fins 2. As shown in FIG. 8, there is also a hot water supply heat exchanger 4 provided with, for example, a cylindrical tank 37. The hot water supply heat exchanger 4 shown in the figure has a plurality of exhaust passages 38 formed in a tank 37, and a large amount of water in the tank 37 is heated by the burner 1 at a time.
FIG. 7A is a cross-sectional view taken along the line AA of FIG.

As shown in FIG. 6, the water supply passage 46 is provided with a water supply thermistor 18 as a water supply temperature detecting means for detecting a water supply temperature of the water supplied from the water supply passage 46 and flowing into the hot water supply heat exchanger 4. A water amount sensor 15 for detecting a flow rate of water flowing into the heat exchanger 4 is provided, and a hot water supply thermistor 11 for detecting the temperature of hot water flowing out of the hot water supply heat exchanger 4 is provided in the hot water supply passage 47. Have been.

A water heater of this type has a built-in control device 20 for controlling the operation of the water heater, and a remote controller 50 is connected to the control device 20 by signal. Remote controller 50 is provided with hot water temperature setting means 14 as fluid temperature setting means for a user of hot water to set the hot water temperature within a predetermined hot water temperature range (within the fluid temperature range).

The control unit 20 includes the water amount sensor 15
There is provided a combustion control unit 21 which takes in various sensor outputs such as the above, information of the remote controller 50, etc., and controls combustion of the burner 1. For example, when a hot water tap (not shown) provided at the distal end side of the hot water supply passage 47 is opened and the flow of water to the hot water supply heat exchanger 4 is detected by the water amount sensor 15, the combustion control unit 21 starts the combustion. The fan 5 is driven to rotate, and the on-off valve 43 is opened to start supplying fuel to the burner 1 to start burner combustion.

[0008] The combustion control unit 21 is provided with a remote control 50.
The hot water supply set temperature set in the hot water supply temperature setting means 14, the incoming water temperature detected by the incoming water thermistor 18, the outgoing water temperature detected by the outgoing water thermistor 11, and the hot water supply heat exchanger 4 detected by the water amount sensor 15. The amount of combustion heat of the burner 1 is controlled by controlling the valve opening of the proportional valve 44 so that hot water at the hot water supply set temperature can be supplied based on the information on the flow rate of hot water and the hot water supply set temperature. Supply hot water.

The control of the proportional valve 44 by the combustion control unit 21 is performed by adding the feedforward heat supply (F / F) and the feedback heat supply (F / B) to the total combustion heat Q (Q = F / F). F + F / B).

The feedforward heat supply is calculated by detecting the temperature Tin of the incoming water thermistor 18, the hot water supply set temperature Tsp, and the flow rate Fw detected by the water amount sensor 15.
Is calculated based on the following equation (1). The feedback supply heat amount includes a proportional constant A determined by PID calculation or the like and a flow rate detected by the flow rate detection sensor 13 such that the detected temperature (outflow temperature) Tout detected by the tapping temperature sensor 11 becomes the hot water supply set temperature Tsp. By Fw,
It is obtained by the following equation (2). Equation (1),
Η shown in (2) indicates a predetermined thermal efficiency of the hot water supply heat exchanger 4.

F / F = (Tsp−Tin) × Fw / η (1)

F / B = A (Tsp−Tout) × Fw / η (2)

[0013] The feedback supply heat amount of the total combustion heat amount is calculated when the feed-forward supply heat amount is calculated and the fuel gas is supplied to the burner 1, and when the outlet water temperature does not reach the hot water supply set temperature. The excess or deficiency of the above is compensated, and the closer to zero, the more desirable (ideally, zero is desirable).

The combustion control unit 21 makes the burner 1 proportional to the required amount of combustion heat within a range from the minimum combustion to the maximum combustion of the burner 1 in accordance with control data such as a proportional expression or a graph given in advance. To control the number of rotations of the combustion fan 5. The air blown from the combustion fan 5 to the burner 1 is used by the combustion of the burner 1, and the exhaust gas is discharged to the outside through the hot water supply heat exchanger 4.

Then, the hot water tap is closed and the water amount sensor 1 is turned on.
When the stoppage of water flow is detected by 5, the combustion control unit 21 closes the on-off valve 43 to stop the combustion of the burner 1, and then stops the combustion fan 5.

[0016]

By the way, immediately after the start of combustion of the burner 1, the water temperature in the hot water supply heat exchanger 4 is low, so that when the exhaust gas passes through the hot water supply heat exchanger 4,
The water vapor contained in the exhaust gas is cooled by the cold water in the hot water supply heat exchanger 4 to become liquid water, and moisture (condensation) adheres to the hot water supply heat exchanger 4, for example, as shown in FIGS. Then, due to the dew condensation, the exhaust passage is blocked, so that the combustion air of the burner 1 becomes insufficient, and there arises a problem that carbon monoxide and soot are generated.

When soot is generated in this way, the exhaust passage is more and more blocked, and furthermore, the combustion air of the burner 1 becomes insufficient, and a vicious cycle such as generation of carbon monoxide and soot is generated. The blockage of the passage progresses at an accelerated rate, causing problems such as the inability of the burner 1 to burn itself and shortening the life of the hot water supply heat exchanger 4.

The moisture (condensation) adhering to the hot water supply heat exchanger 4 is called a drain. In the drain, a sulfur compound (S) in the exhaust gas generated by combustion of the burner 1 is contained.
O _X) and nitrogen compounds (NO _x) corrosive gas or the like is dissolved. Therefore, the drain is an acidic aqueous solution containing sulfuric acid or nitric acid and having a hydrogen ion concentration of about 3 at PH. The adhesion of the drain causes corrosion of the hot water supply heat exchanger 4, and the corrosion also causes the hot water supply heat exchanger. 4 has a short life.

The above-mentioned problems of exhaust passage blockage due to dew condensation and corrosion of the liquid heater also occur in a cooling / heating device, a cooling device, and a heating device provided with a regenerator 3 as shown in FIG. Was. Note that FIG. 9 shows a regenerator 3 as a liquid heater used in an outdoor unit of a cooling / heating device, a cooling device, and a heating device and a combustion unit thereof. By heating a liquid (for example, a liquid mixture of water and lithium bromide) in the vessel 3 with the burner 1, different types of liquids (for example, water and lithium bromide) contained in the liquid are separated and regenerated. .

Although not shown in the figure, an absorber is connected to the regenerator 3 through a liquid introduction pipe. In an apparatus having a heating function, at the time of heating, water is introduced into the regenerator 3 from, for example, an absorber through a liquid introduction pipeline. In an apparatus having a cooling function, in addition to the above liquid introduction pipe, for example, a liquid delivery pipe for sending the lithium bromide liquid separated by the regenerator 3 to the absorber is provided. The lithium bromide liquid is returned to the absorber through the delivery pipe, and the water is absorbed by the lithium bromide liquid in the absorber, and the mixed liquid is introduced into the regenerator 3 through the liquid introduction pipe. And lithium bromide
It circulates between the regenerator 3 and the absorber through the liquid introduction pipe and the liquid delivery pipe. Note that the configurations of the cooling / heating device, the cooling device, and the heating device including such a regenerator 3 are well known, and the detailed description thereof will be omitted.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a liquid heater such as a hot water supply heat exchanger or a regenerator, for example, immediately after the start of burner combustion. Provided is a combustion device that can suppress the formation of condensation on the liquid heater even when the liquid temperature of the liquid heater is low, shorten the life of the liquid heater due to the formation of condensation, and suppress the occurrence of incomplete combustion. It is in.

[0022]

In order to achieve the above-mentioned object, the present invention has the following structure to solve the problem. That is, the first invention includes a liquid heater that contains or circulates a liquid therein, a heating unit that heats the liquid in the liquid heater, and a combustion fan that supplies and exhausts the combustion of the heating unit. The combustion device further comprises a liquid temperature detecting means for detecting the temperature of the liquid, and when the liquid temperature detected by the liquid temperature detecting means is equal to or higher than a predetermined reference temperature, the required amount of combustion heat of the heating means is reduced. First fan rotation control data for controlling the number of rotations of the combustion fan in accordance with the rotation speed of the combustion fan when the liquid temperature is lower than the reference temperature. The second fan rotation control data to be controlled on the up side is given in advance, and when the liquid temperature is equal to or higher than the reference temperature, the combustion fan is controlled based on the first fan rotation control data. When rotation control is performed, and when the liquid temperature is lower than the reference temperature, the rotation control of the combustion fan is performed based on the second fan rotation control data to thereby prevent condensation from adhering to the liquid heater. It is a means to solve the problem with the configuration.

According to a second aspect of the present invention, there is provided a liquid heater for containing or flowing a liquid therein, a heating means for heating the liquid in the liquid heater, and a combustion fan for supplying and exhausting the combustion of the heating means. A liquid temperature for estimating a reference temperature achievement time of a liquid temperature at which the temperature of the liquid becomes a predetermined reference temperature from at least one of a liquid volume value and a liquid type in the liquid heater. It has means for estimating the achievement time,
First fan rotation control data for controlling the number of revolutions of the combustion fan in accordance with the required amount of combustion heat of the heating means when the combustion time from the start of combustion of the heating means is equal to or longer than the reference temperature achievement time; When the time is less than the reference temperature achievement time, the second fan rotation control data for controlling the number of rotations of the combustion fan to the air volume increasing side in accordance with the required amount of combustion heat of the heating means is provided in advance, When the combustion time is equal to or longer than the reference temperature achievement time, the rotation control of the combustion fan is performed based on the first fan rotation control data. When the combustion time is less than the reference temperature achievement time, the second fan rotation control is performed. A rotation speed control means for controlling rotation of the combustion fan based on the data to thereby prevent condensation from adhering to the liquid heater; It is a means to solve the problems with.

Further, a third aspect of the present invention provides a liquid heater for containing or circulating a liquid therein, a heating means for heating the liquid in the liquid heater, and a combustion fan for supplying and exhausting the combustion of the heating means. And a liquid temperature detecting means for detecting the temperature of the liquid, the relational data between the required amount of combustion heat of the heating means and the rotation speed of the combustion fan correspond to the temperature of the liquid A plurality of fan rotation control data is provided in advance, the fan rotation control data corresponding to the temperature of the liquid detected by the liquid temperature detection means is selected, and the combustion fan of the combustion fan is selected based on the selected fan rotation control data. By performing rotation control, the number of rotations of the combustion fan is increased as the temperature of the liquid decreases, and the number of rotations of the combustion fan is reduced to prevent condensation from adhering to the liquid heater. And a means for solving the problems with the construction having the number control unit.

Further, the fourth invention is directed to the first or second embodiment.
Alternatively, in addition to the configuration of the third aspect, the liquid heater has a configuration in which the liquid in the liquid heater is heated by a heating unit to separate and regenerate different types of liquids contained in the liquid. It is a means to solve the problem.

Further, the fifth invention is directed to the first or the second embodiment.
Alternatively, in addition to the configuration of the third invention, a water supply passage is connected to an inlet side of the liquid heater, and a hot water supply passage is connected to an outlet side of the liquid heater. This is a means for solving the problem with a configuration of a hot water supply heat exchanger that supplies the supplied water by a heating means and sends it to a hot water supply passage.

In a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the liquid temperature detecting means is provided as a means for solving the problem with a configuration provided on the outlet side of the hot water supply heat exchanger.

Further, a seventh invention provides a hot water supply heat exchanger,
A heating means for the hot water supply heat exchanger; and a combustion fan for supplying and exhausting the combustion of the heating means, wherein the water supplied from the water supply passage is heated through the hot water supply heat exchanger and sent out to the hot water supply passage. In a combustion device having a hot water supply function, the combustion device further includes an input water temperature detection unit for detecting an input temperature of water supplied from a water supply passage, and a relational data between a required amount of combustion heat of the heating unit and a rotation speed of the combustion fan is previously stored. A plurality of fan rotation control data is provided in advance as a plurality of fan rotation control data corresponding to the entry water temperature, and the fan rotation control data corresponding to the input water temperature detected by the input water temperature detection means is selected. By controlling the rotation of the combustion fan on the basis of the temperature of the hot water, the rotation speed of the combustion fan is increased as the temperature of the incoming water is reduced to suppress the condensation of the hot water supply heat exchanger. And a means for solving the problems with the construction having the number control unit.

Further, the eighth invention is directed to the fifth or sixth embodiment.
Alternatively, in addition to the configuration of the seventh aspect, for each of the fan rotation control data, it is possible to satisfy a condition that dew condensation does not occur in the hot water supply heat exchanger and to set the heat efficiency of the hot water supply heat exchanger to a predetermined set efficiency. A feedforward constant that can be given in advance is provided, and a feedforward calculation unit that calculates a feedforward supply heat amount supplied to the heating unit using a feedforward constant corresponding to the fan rotation control data selected by the fan rotation speed control unit is provided. It is a means to solve the problem with the configuration described.

As described above, condensation adheres to a liquid heater such as a hot water supply heat exchanger or a regenerator when the liquid temperature in the liquid heater is low.

In the first invention, the temperature of the liquid in the liquid heater is detected by the liquid temperature detecting means, and when the liquid temperature detected by the liquid temperature detecting means is equal to or higher than a predetermined reference temperature, the fan The number of revolutions of the combustion fan is controlled by the rotation control means based on first fan rotation control data given in advance according to the required amount of combustion heat of the heating means of the liquid heater. Further, when the liquid temperature is lower than the reference temperature, the fan rotation control means sets the number of rotations of the combustion fan to second fan rotation control data given in advance in accordance with the required amount of combustion heat of the heating means. Is controlled based on the airflow.

Therefore, if the liquid temperature at which dew condensation occurs in the liquid heater is defined as the reference temperature, when the liquid temperature is lower than the reference temperature, the second fan rotation is controlled by the fan rotation control means. By performing the rotation control of the combustion fan on the air volume increasing side based on the control data, it is possible to lower the humidity of the exhaust gas and raise the outdoor temperature of the steam in the exhaust gas. Can be suppressed from adhering.

In the second invention, the liquid temperature attainment time estimating means determines the liquid temperature at which the temperature of the liquid reaches a predetermined reference temperature from the liquid volume value and the type of liquid in the liquid heater. Estimate the reference temperature achievement time. When the combustion time from the start of combustion of the heating means is equal to or longer than the reference temperature achievement time, the rotation speed of the combustion fan is controlled by the fan speed control means based on the first fan rotation control data, When the time is less than the reference temperature achievement time, the fan speed control means controls the rotation of the combustion fan based on the second fan rotation control data.

Therefore, also in the second invention, the first invention
If the liquid temperature at which dew condensation occurs in the liquid heater is determined as the reference temperature, it is possible to suppress the dew condensation on the liquid heater.

In the third invention, the relational data between the required amount of combustion heat of the heating means of the liquid heater and the number of revolutions of the combustion fan corresponds to a plurality of fans corresponding to the temperature of the liquid in the liquid heater. It is given in advance as rotation control data. Then, the fan rotation control means selects the fan rotation control data corresponding to the temperature of the liquid detected by the liquid temperature detection means, and performs the rotation control of the combustion fan based on the selected fan rotation control data. By increasing the rotation speed of the combustion fan as the temperature of the liquid decreases, the lower the temperature of the liquid, the lower the humidity of the exhaust gas and the higher the outdoor temperature of water vapor in the exhaust gas. Therefore, it is possible to suppress the formation of dew on the liquid heater.

Further, in the seventh invention, the relational data between the required amount of combustion heat of the heating means of the hot water supply heat exchanger and the number of revolutions of the combustion fan corresponds to a plurality of data corresponding to the temperature of incoming water to the hot water supply heat exchanger. It is given in advance as fan rotation control data. Then, the fan rotation speed control means selects the fan rotation control data corresponding to the incoming water temperature to the hot water supply heat exchanger detected by the incoming water temperature detection means, and based on the selected fan rotation control data, the rotation of the combustion fan. By performing the control, the rotation speed of the combustion fan is increased as the incoming water temperature becomes lower, so that the lower the incoming water temperature and the lower the temperature of the water in the hot water supply heat exchanger, the lower the exhaust humidity. As a result, the dew temperature of the steam in the exhaust gas can be raised, so that dew condensation in the hot water supply heat exchanger can be suppressed.

[0037]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals are given to the same parts as those in the conventional example, and the duplicate description thereof will be omitted. FIG. 1 shows an example of a control configuration unique to the combustion device according to the present invention. Note that the combustion device of the present embodiment has the system configuration shown in FIG.
The structure of the hot water supply heat exchanger 4 is a general hot water supply as shown in FIG.

The first embodiment of the present invention will be described. The feature of the first embodiment that is different from the conventional example is that the provision of a control configuration as shown in FIG. 1 makes it possible to suppress the formation of condensation on the hot water supply heat exchanger 4. .

As shown in FIG. 1, a water heater according to the present embodiment includes a combustion control unit 21 and a data storage unit 1 in a control device 20.
0, and a fan control unit 8 is provided in the combustion control unit 21. As shown by a broken line in FIG. 7, a hot water supply heat exchanger hot water temperature sensor as a liquid temperature detecting means for detecting a temperature of water (hot water) in the hot water supply heat exchanger 4 is provided at an outlet side of the hot water supply heat exchanger 4. 6 are provided.

The data storage section 10 stores graph data as shown in FIG. 3 as first and second fan rotation control data. The first fan rotation control data is shown by a characteristic line a in the figure, and when the water temperature detected by the hot water supply heat exchanger hot water temperature sensor 6 is equal to or higher than a predetermined reference temperature, the demand of the burner 1 is determined. This is fan rotation control data for controlling the number of revolutions of the combustion fan 5 according to the amount of combustion heat.
This data is based on the required combustion heat amount of the burner 1 and the combustion fan 5 so that the hot water at the hot water supply set temperature set by the hot water supply temperature setting means 14 of the remote controller 50 can be supplied by an experiment or the like in advance.
Is obtained as graph data.

The reference temperature is the water temperature in the hot water supply heat exchanger 4 where no condensation occurs in the hot water supply heat exchanger 4 when the rotation speed of the combustion fan 5 is controlled based on the first fan rotation control data. Is determined in advance by experiments or the like, and is, for example, 80 ° C. In this experiment, the water temperature in the hot water supply heat exchanger 4 was measured by a hot water supply heat exchanger hot water temperature sensor 6 provided on the outlet side of the hot water supply heat exchanger 4. Since the outdoor temperature of the steam in the exhaust gas is about 60 to 70 ° C., the reference temperature is set to a temperature higher than the outdoor temperature.

The second fan rotation control data is shown in FIG.
When the water temperature detected by the hot water supply heat exchanger hot water temperature sensor 6 is lower than the reference temperature, the combustion fan 5 according to the required amount of combustion heat of the burner 1 is provided.
This is fan rotation control data for controlling the number of rotations to the side of increasing the air volume. This data is, for example, data for controlling the fan airflow by about 10% to the up side than the first fan rotation control data.

The fan rotation speed control means 8 fetches the fan rotation control data as shown in FIG. 3 stored in the data storage section 10, and the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6. When the water temperature in the hot water supply heat exchanger 4 is equal to or higher than the reference temperature, the rotation of the combustion fan 5 is controlled based on the first fan rotation control data. When the water temperature is lower than the reference temperature, the rotation of the combustion fan 5 is controlled based on the second fan rotation control data, thereby suppressing the formation of condensation on the hot water supply heat exchanger 4.

In the water heater shown in FIG. 6, since the temperature of the exhaust gas becomes lower as the distance from the burner 1 of the burner 1 increases, that is, as the upper side of the exhaust passage becomes lower, the type of the water heater shown in FIG. In the hot water supply heat exchanger 4, dew condensation is most likely to adhere to the region on the outlet side of the hot water supply heat exchanger 4. Therefore, in the present embodiment, as described above, the hot water supply heat exchanger hot water temperature sensor 6 is provided on the outlet side of the hot water supply heat exchanger 4, and the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot temperature sensor 6 is provided. The rotation speed of the combustion fan 5 is controlled by the fan rotation speed control means 8 based on the water temperature in the inside.

The present embodiment is configured as described above. Also in this embodiment, as shown in step 101 of FIG. 2, when the operation of the water heater is started, step 102 is started.
In the same manner as in the conventional example, the combustion control unit 21 controls the proportional control of the combustion of the burner 1 (control of the proportional valve 44) in correspondence with the total amount of combustion heat obtained by adding the feedforward supply heat amount and the feedback supply heat amount. Is started,
In this embodiment, at the same time, the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 is fetched momentarily by the fan rotation speed control means 8 in the combustion control unit 21.

Then, at step 103 in FIG. 2, the water temperature (hot water temperature) in the hot water supply heat exchanger 4 is set to the reference temperature of 80 ° C.
If the temperature is equal to or higher than 80 ° C., in step 104, the fan rotation speed is controlled by the fan rotation speed control means 8 based on the characteristic line a in FIG. 3, and the normal operation is performed.

On the other hand, when it is determined in step 103 of FIG. 2 that the water temperature (hot water temperature) in the hot water supply heat exchanger 4 is lower than 80 ° C., the fan rotation speed control means 8 in FIG. The fan rotation control based on the characteristic line b is performed, and compared with the fan rotation control based on the characteristic line a in FIG.
The rotation speed of the combustion fan 5 is increased by about 10% and controlled. In step 103, the rotation control of the combustion fan 5 based on the characteristic line b in FIG. 3 is performed until the water temperature in the hot water supply heat exchanger 4 reaches 80 ° C., and the water temperature in the hot water supply heat exchanger 4 becomes 80 ° C. Then, the rotation of the combustion fan 5 is controlled based on the characteristic line a in FIG.

According to the present embodiment, the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 is:
When the rotation speed of the combustion fan 5 is controlled based on the first fan rotation control data and the temperature is lower than 80 ° C., which is a temperature at which dew condensation does not occur in the hot water supply heat exchanger 4, the fan rotation control means 8 In order to control the number of revolutions of the combustion fan 5 in accordance with the required amount of combustion heat of the burner 1 to be higher than the first fan rotation control data on the basis of the fan rotation control data of No. 2, In order to reduce the humidity of the exhaust gas, it is possible to raise the dew temperature of the steam in the exhaust gas so as to prevent dew condensation on the hot water supply heat exchanger 4 even when the water temperature in the hot water supply heat exchanger 4 is low. Can be suppressed.

In the present embodiment, even if dew condensation occurs temporarily immediately after the start of combustion of the burner 1 or the like, despite the fact that the air volume of the combustion fan 5 is controlled to be on the up side, the combustion fan During the control with the air volume of the air supply 5 on the up side, the water temperature in the hot water supply heat exchanger 4 rises, so that the humidity of the exhaust gas can be further reduced. Can be done. According to the present embodiment, when the water temperature in the hot water supply heat exchanger 4 reaches the reference temperature, dew condensation can be evaporated, and at that time, the air volume of the combustion fan 5 is switched to normal control. Furthermore, in a state where dew condensation is not attached to the hot water supply heat exchanger 4, the burner 1 can be burned by performing proportional control corresponding to the required amount of combustion heat of the burner 1.

Further, according to the present embodiment, as described above, it is possible to suppress the formation of dew on the hot water supply heat exchanger 4, so that the exhaust passage is blocked by the dew condensation as in the conventional water heater. The incomplete combustion of the burner 1 generates carbon monoxide and soot, and the burner 1 itself cannot be burnt due to the blockage of the exhaust passage due to the generation of soot and the vicious cycle of soot generation due to the incomplete combustion of the burner 1. Or shortening of the life of the hot water supply heat exchanger 4 can be suppressed.

Even if dew condensation is temporarily attached to the hot water supply heat exchanger 4 immediately after the start of hot water supply combustion of the burner 1, the combustion of the burner 1 is controlled by increasing the airflow of the combustion fan 5 to the up side. Since the shortage of air can be suppressed, the problem of carbon monoxide and soot generation due to incomplete combustion of the burner 1 can also be suppressed, and the obstruction of the exhaust passage due to the generation of soot and the failure of the burner 1 as in a conventional water heater. The life of the hot water supply heat exchanger 4 is not shortened due to the vicious cycle of soot generation due to complete combustion.

Furthermore, according to the present embodiment, since the dew can be prevented from adhering to the hot water supply heat exchanger 4, the problem of corrosion of the hot water supply heat exchanger 4 due to the condensation (drain) can be suppressed. Hot water supply heat exchanger 4
Since the problem that the life of the water heater is shortened can be suppressed, a water heater having a long life can be obtained.

According to the present embodiment, when the water temperature in the hot water supply heat exchanger 4 is 80 ° C. or higher, no condensation occurs in the hot water supply heat exchanger 4. By controlling the rotation speed of the combustion fan 5 according to the required amount of combustion heat of the burner 1 based on the first fan rotation control data, the hot water supply temperature set by the hot water temperature setting means 14 of the remote controller 50 is set. You can tap the hot water.

Further, according to the present embodiment, the hot water supply heat exchanger hot water temperature sensor 6 is provided on the outlet side of the hot water supply heat exchanger 4, and the hot water supply heat exchanger 4 is supplied to a portion where dew condensation is most likely to adhere. Since the heat exchanger hot water temperature sensor 6 is provided, the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 is used.
By performing the fan rotation control of the combustion fan 5 based on the water temperature in the inside, it is possible to more reliably suppress the formation of condensation on the hot water supply heat exchanger 4.

Next, a second embodiment of the combustion apparatus according to the present invention will be described. The second embodiment is substantially similar in configuration to the first embodiment. What is different from the first embodiment is that the second embodiment is provided with a data storage unit 10. The relationship data between the required amount of combustion heat of the burner 1 and the number of revolutions of the combustion fan 5 is converted to the water temperature (hot water temperature) in the hot water supply heat exchanger 4 as shown by, for example, characteristic lines a, b, c, and d in FIG. A plurality of fan rotation control data are set correspondingly, and the fan rotation speed control means 8 controls the rotation speed of the combustion fan 5 based on any of the control data.

The characteristic line a in FIG. 4 is fan rotation control data similar to the characteristic line a shown in FIG. 3, and is detected by the hot water supply heat exchanger hot water temperature sensor 6 inside the hot water supply heat exchanger 4. This is fan rotation control data when the water temperature is 80 ° C. or higher. Further, for example, the characteristic line b in FIG.
Rotation control data when the water temperature in the inside is 75 ° C. or more and less than 80 ° C., the characteristic line c indicates that the water temperature in the hot water supply heat exchanger 4 is 70 ° C.
The fan rotation control data when the temperature is not less than 75 ° C. and less than 75 ° C., and the characteristic line d is given in the second embodiment, such as the fan rotation control data when the water temperature in the hot water supply heat exchanger 4 is less than 65 ° C. The fan rotation control data (characteristic lines a, b, c, and d shown in FIG. 4) indicates that the temperature of the combustion fan 5 controlled according to the required combustion heat amount of the burner 1 as the water temperature in the hot water supply heat exchanger 4 decreases. This is data for controlling the fan rotation speed to be high.

The fan rotation speed control means 8 corresponds to the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 among the data shown by the characteristic lines a, b, c and d. By selecting the fan rotation control data (characteristic line) and controlling the rotation of the combustion fan 5 based on the selected fan rotation control data, the rotation speed of the combustion fan 5 decreases as the water temperature in the hot water supply heat exchanger 4 decreases. Is increased to prevent condensation from condensing on the hot water supply heat exchanger 4.

When the burner 1 is burned, as in the first embodiment, even when the temperature of the hot water supply heat exchanger 4 is low, if the rotation speed of the combustion fan 5 is increased to increase the air volume, Adhesion of dew condensation on the hot water supply heat exchanger 4 can be suppressed. However, as described above, the control data indicated by the characteristic line a in FIGS.
The result of obtaining the relationship between the required amount of combustion heat of the burner 1 and the fan rotation speed of the combustion fan 5 such that hot water at the hot water supply temperature set by the hot water supply temperature setting means 14 of the remote controller 50 can be supplied is shown as graph data. Therefore, if the rotation speed of the combustion fan 5 is increased based on the control data, while the rotation speed of the combustion fan 5 is increased, an excessive air volume of the combustion fan 5 causes the hot water supply temperature setting means 1 of the remote controller 50 to increase.
No control is performed so that hot water at the hot water supply set temperature set in step 4 can be discharged.

Then, as the rate of increase in the air volume of the combustion fan 5 increases, the rate at which dew condensation can be suppressed on the hot water supply heat exchanger 4 increases. On the other hand, the thermal efficiency of the hot water supply heat exchanger 4 decreases. This makes it difficult for the hot water at the set hot water supply temperature to flow. Therefore, in the second embodiment, as the water temperature in the hot water supply heat exchanger 4 increases, corresponding to the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6, that is, As the condensation hardly adheres to the hot water supply heat exchanger 4, the amount of increase in the air volume of the combustion fan 5 is reduced, so that the condensation of the condensation on the hot water supply heat exchanger 4 is suppressed, and the hot water at the hot water supply set temperature is stabilized as quickly as possible. As described above, a plurality of fan rotation control data is obtained in advance through experiments or the like so as to supply hot water, and the rotation speed of the combustion fan 5 is controlled by selectively switching the fan rotation control data.

The second embodiment is configured as described above, and the fan speed control means 8 selectively switches the fan speed control data as described above to control the speed of the combustion fan 5. Thereby, it is possible to suppress the dew condensation on the hot water supply heat exchanger 4, and to achieve the same effect as in the first embodiment.

According to the second embodiment, the rotation speed of the combustion fan 5 is controlled by selectively switching the four fan rotation control data to control the number of rotations of the combustion fan 5, so that the hot water supply heat exchanger 4 is increased by increasing the fan airflow. It is possible to stably supply hot water having a temperature close to the hot water supply set temperature as soon as possible after the combustion of the burner 1 is started while suppressing a decrease in thermal efficiency as much as possible.

Next, a third embodiment of the combustion apparatus according to the present invention will be described. The third embodiment is substantially the same as the first and second embodiments. The third embodiment is different from the first and second embodiments in that the data storage unit 10 The relationship data between the required amount of combustion heat of the burner 1 and the number of revolutions of the combustion fan 5 is converted into the input temperature of the water supplied from the water supply passage 46 as shown by characteristic lines a, b, and c in FIG. A plurality of fan rotation control data corresponding thereto; and a configuration in which the fan rotation speed control means 8 controls the rotation speed of the combustion fan 5 based on any of the control data. The feedforward operation unit 9 shown by a broken line in FIG.
That is,

The characteristic line a in FIG. 5 is fan rotation control data when the incoming water temperature detected by the incoming water thermistor 18 is 20 ° C. or higher, and the characteristic line b is the 10
The fan rotation control data when the water temperature is not less than 20 ° C. and less than 20 ° C., and the characteristic line c is the fan rotation control data when the water temperature is less than 10 ° C. That is, the fan rotation control data given in the third embodiment (characteristic lines a, b,
c) is data for controlling the fan speed of the combustion fan 5 controlled according to the required amount of combustion heat of the burner 1 to increase as the incoming water temperature decreases.

When the temperature of the water supplied from the water supply passage 46 to the hot water supply heat exchanger 4 is low, the temperature of the water inside the hot water supply heat exchanger 4 also naturally becomes low, and condensation is formed on the hot water supply heat exchanger 4. (Dew condensation easily occurs in the hot water supply heat exchanger 4). Therefore, in the third embodiment, the temperature of the water supplied to the hot water supply heat exchanger 4, that is, the incoming water thermistor 1
Water temperature detected by 8 (water temperature of water supply passage 46)
Is lower, the fan speed of the combustion fan 5 controlled according to the required amount of combustion heat of the burner 1 is controlled to be higher, so that the rotation speed of the combustion fan 5 is controlled so that dew condensation does not occur in the hot water supply heat exchanger 4. The data to be controlled was obtained in advance by experiment or the like as fan rotation control data, and stored in the data storage unit 10.

The fan rotation speed control means 8 captures the data shown by the characteristic lines a, b, and c, and captures the detected temperature of the incoming water thermistor 18 every moment as shown by the broken line in FIG. By selecting fan rotation control data corresponding to the incoming water temperature detected by the incoming water thermistor 18 from the data shown in b and c, and performing rotation control of the combustion fan 5 based on the selected fan rotation control data, As the water temperature decreases, the rotation speed of the combustion fan 5 is increased to suppress the condensation of the hot water supply heat exchanger 4.

In the third embodiment, the condition that no dew condensation occurs in the hot water supply heat exchanger 4 is satisfied and the heat efficiency of the hot water supply heat exchanger 4 is set to a predetermined efficiency for each fan rotation control data. A feedforward constant (k = 1 / ηs) that can be set to ηs is given in advance. The set efficiency may be different for each fan rotation control data, or may be the same value.
The highest possible thermal efficiency is set as the set efficiency ηs within a range that satisfies the condition in which dew condensation does not occur in the hot water supply heat exchanger 4, and is stored in the data storage unit 10.

The feedforward operation unit 9 obtains the amount of feedforward heat supplied to the burner 1 using a feedforward constant corresponding to the fan rotation control data selected by the fan rotation speed control unit 8.

The combustion control unit 21 controls the fan rotation speed of the combustion fan 5 by the fan rotation speed control means 8 as described above, as well as the feedforward supply heat amount obtained by the feedforward calculation unit 9 and the feedback. Total combustion heat quantity Q (Q = F /
F + F / B), the proportional valve 44 is proportionally controlled.

The third embodiment is configured as described above, and the third embodiment also includes the fan rotation speed control means 8.
By controlling the rotation speed of the combustion fan 5 as described above, it is possible to suppress the formation of dew condensation on the hot water supply heat exchanger 4 and achieve the same effect as in the above embodiments.

The actual thermal efficiency of the hot water supply heat exchanger 4 is as follows:
When the rotation speed of the combustion fan 5 is controlled by selectively switching a plurality of fan rotation control data as in the third embodiment, for example, hot water supply heat The heat efficiency of the exchanger 4 is 80
%, The total combustion calorie is calculated as a constant value such as
This calculated value does not match the actually required combustion heat quantity, and hot water at the set temperature cannot be obtained.

Under the condition that no dew condensation occurs in the hot water supply heat exchanger 4 through experiments or theoretical calculations using empirical formulas, if the highest possible thermal efficiency is given to each fan rotation control data, , Given the feedforward constant corresponding to its thermal efficiency,
The dew condensation does not occur in the hot water supply heat exchanger 4 and the combustion operation can be performed with high efficiency, so that hot water close to the set temperature can be output with the feedforward heat supply. In that case, the feedback supply heat amount becomes a value close to zero, and the ideal combustion operation control is performed.

According to the third embodiment, as described above, the highest possible thermal efficiency is set for each fan rotation control data within a range that satisfies the condition in which dew condensation does not occur in the hot water supply heat exchanger 4. Is set in advance, and a feedforward constant is set for each fan rotation control data in accordance with the set efficiency, and a feedforward constant corresponding to the fan rotation control data selected by the fan rotation speed control unit 8 is used. In order for the feedforward computing unit 9 to determine the feedforward heat supply to be supplied to the burner 1, as described above, hot water having a hot water temperature close to the hot water supply set temperature can be output using the feedforward supply heat, and therefore, Hot water temperature fluctuation can be made very small.

The present invention is not limited to the above-described embodiments, but can adopt various embodiments. For example, in the first embodiment, control data for increasing the fan airflow of the combustion fan 5 by about 10% compared to the first fan rotation control data is given as the second fan rotation control data. The second fan rotation control data is obtained by increasing the fan airflow of the combustion fan 5 more than the first fan rotation control data, so that even when the temperature of the hot water supply heat exchanger 4 is lower than the reference temperature, Any fan rotation control data that does not cause condensation to adhere to the fan 4 may be used, and the air volume increase rate and the like are appropriately set in accordance with the combustion device.

In the first embodiment, the reference temperature is set to 80 ° C., but the reference temperature is not particularly limited. For example, the liquid in the liquid heater such as the hot water supply heat exchanger 4 may be used. Is appropriately set in accordance with the type of the liquid heater and the size and shape of the liquid heater.

Further, in the above-described first embodiment, the first fan rotation control data is one line indicated by the graph data. However, for example, the exhaust passage is gradually changed depending on the years of use of the burner 1. In consideration of blocking,
As indicated by the broken line in FIG. 3, data may be given in accordance with the years of use of the burner 1 so that when the years of use are long, the number of revolutions of the combustion fan 5 is controlled to be slightly increased by that amount.

Further, in the first embodiment, the combustion fan 5 determines whether or not the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 is equal to or higher than the reference temperature. The rotation speed of the liquid is switched and controlled. However, the temperature of the liquid is determined from at least one of the liquid volume value and the type of the liquid in the liquid heater such as the hot water supply heat exchanger 4 and the regenerator 3 so that the reference temperature is determined in advance. Liquid temperature achievement time estimating means for estimating the reference temperature achievement time of the liquid temperature by processing, for example, table data, graph data, calculation data, and the like, and achieving the combustion time from the start of combustion of the burner 1 The rotation speed of the combustion fan 5 may be switched and controlled depending on whether or not the reference temperature achievement time estimated by the time estimation means is equal to or longer than the time.

In the case of such control, when the combustion time from the start of combustion of the burner 1 is equal to or longer than the reference temperature achieving time, the number of revolutions of the combustion fan 5 is controlled in accordance with the required amount of combustion heat of the burner 1. The rotation speed of the combustion fan 5 according to the required amount of combustion heat of the burner 1 when the combustion time is shorter than the reference temperature achievement time, is given by, for example, data as shown by a characteristic line a in FIG. Is given by, for example, data as shown by a characteristic line b in the figure, and the fan speed control means 8 determines that the combustion time is longer than the reference temperature achievement time. Sometimes, the rotation control of the combustion fan is performed based on the first fan rotation control data. When the combustion time is shorter than the reference temperature achievement time, the second fan rotation control data is controlled. Performs rotation control of the combustion fan based on the data.

As described above, when the rotation control of the combustion fan 5 is performed by comparing the reference temperature achievement time with the combustion time of the burner 1, as in the case of the first embodiment described above, When the combustion time is short and the liquid temperature in the liquid heater such as the hot water supply heat exchanger 4 is low, dew adheres to the liquid heater by increasing the fan air volume of the combustion fan 5 and burning the burner 1. Therefore, the same effects as in the first embodiment can be obtained.

The liquid volume value in the liquid heater used for estimating the reference temperature achievement time is, for example, in the case of a water heater, the volume in the passage of the hot water heat exchanger 4 and the regenerator 3 is used. In the case of a cooling / heating device, a cooling device, or a heating device provided, the volume in the regenerator 3 may be used, or the volume in the regenerator 3 and the volume of the liquid introduction pipe may be used. Alternatively, when estimating the reference temperature achievement time of the liquid temperature during cooling, a volume obtained by adding the volume in the regenerator 3 and the volumes of the liquid introduction pipe and the liquid delivery pipe may be used.

Further, in the second embodiment, four fan rotation control data are given in correspondence with the water temperature in the hot water supply heat exchanger 4, and in the third embodiment, the water inlet temperature to the water supply passage 46 is reduced. Although three sets of fan rotation control data are provided in association with each other, the number of fan rotation control data provided to a combustion device such as a water heater is not particularly limited and may be set as appropriate.

Further, in the second embodiment, the feed-forward operation unit 9 is not provided in the combustion control unit 21. However, as in the third embodiment, the combustion control unit 21 is not provided.
Is provided with a feed-forward operation unit 9 for each fan rotation control data provided to the combustion device, which satisfies the condition that dew condensation does not occur in the hot water supply heat exchanger 4 and sets the heat efficiency of the hot water supply heat exchanger 4 to a predetermined setting. A feedforward constant that can improve the efficiency may be given, and the feedforward calculation unit 9 may calculate the feedforward supply heat amount in the same manner as in the third embodiment.

Further, in the third embodiment, the condition that no dew condensation occurs in the hot water supply heat exchanger 4 is satisfied and the thermal efficiency of the hot water supply heat exchanger 4 is determined in advance for each fan rotation control data given to the combustion device. The feed forward constant that can be set to the specified setting efficiency was given.
Instead of providing a feedforward constant for each fan rotation control data, a feedforward constant may be provided for each range (for example, A, B, C, and D in FIG. 5) of each fan rotation control data.

As described above, if the feedforward constant is given to each range of each fan rotation control data, the calculation of the feedforward heat quantity is performed more than the feedforward constant is given to each fan rotation control data line. By performing the process more finely, it is possible to supply hot water closer to the set temperature with the feed-forward supply heat quantity. It should be noted that the finer the range in which the feedforward constant is given, the more hot water closer to the set temperature can be output with the feedforward heat supply.

Further, in each of the above-described embodiments, graph data indicating the relationship between the required amount of combustion heat of the burner 1 and the rotation speed of the combustion fan 5 is given as the fan rotation control data. It is not limited to this, and may be given by table data, an arithmetic expression, or the like. Further, for example, data indicating the relationship between the required amount of combustion heat of the burner 1 and the fan air volume of the combustion fan 5 and data indicating the relationship between the fan air volume of the combustion fan 5 and the rotation speed are given. The relationship between the required amount of combustion heat of the burner 1 and the number of revolutions of the combustion fan 5 may be determined from the above equation.

Further, in each of the above embodiments, the hot water supply heat exchanger hot water temperature sensor 6 is provided on the outlet side of the hot water supply heat exchanger 4.
The arrangement position of the hot water supply heat exchanger hot water temperature sensor 6 is not particularly limited, and is appropriately set. However, the water temperature in the hot water supply heat exchanger 4 detected by the hot water supply heat exchanger hot water temperature sensor 6 differs depending on the location of the hot water supply heat exchanger hot water temperature sensor 6. When controlling the number of revolutions of the combustion fan 5 by using the hot water supply heat exchanger hot water temperature sensor 6, it is necessary to appropriately set the fan rotation control data to be given and the reference temperature.

Further, in each of the above embodiments, the example in which the gas combustion type burner 1 is provided as the heating means provided in the water heater as the combustion apparatus has been described. However, the heating means provided in the combustion apparatus such as the water heater is described. Is not necessarily a gas-fired burner, but may be an oil-fired heating means, for example.

Further, in each of the above embodiments, the present invention is applied to a water heater provided with a hot water supply heat exchanger 4 as shown in FIG. 7 as a combustion device. Can be applied to a water heater having a hot water supply heat exchanger 4 as shown in FIG. 9 or a water heater having another system configuration, and a cooling device, a heating device, a cooling and heating device having a regenerator 3 as shown in FIG. ,
It can be applied to various combustion devices.

[0088]

According to the first invention, when the liquid temperature in the liquid heater detected by the liquid temperature detecting means is lower than a predetermined reference temperature, the rotation of the combustion fan is controlled by the fan rotation control means. The number is controlled to increase the air flow based on the second fan rotation control data given in advance in accordance with the required amount of combustion heat of the heating means of the liquid heater. When, that is, by controlling the air volume of the combustion fan to the up side when the liquid temperature in the liquid heater is low, it is possible to lower the humidity of the exhaust gas and raise the outdoor temperature of the steam in the exhaust gas, Adhesion of dew to the liquid heater can be suppressed.

Therefore, according to the first aspect of the present invention, the dew condensation on the liquid heater causes the exhaust passage to be blocked and the combustion air of the heating means to be insufficient, resulting in incomplete combustion.
Problems such as generation of carbon monoxide and soot can also be suppressed, and due to the blockage of the exhaust passage due to the generation of soot and the vicious cycle of soot generation due to incomplete combustion of the heating unit, the heating unit itself can not be burned, The problem that the life of the liquid heater is shortened can be suppressed.

Further, according to the first aspect, since the dew can be prevented from adhering to the liquid heater, the problem of corrosion of the liquid heater due to the dew (drain) can be suppressed, and the life can be reduced. The combustion device with a long length can be realized.

According to the second aspect of the present invention, at least one of the volume of the liquid in the liquid heater and the type of the liquid is used to determine a reference temperature achievement time of the liquid temperature at which the temperature of the liquid reaches a predetermined reference temperature. Assuming that when the combustion time from the start of combustion of the heating means is less than the reference temperature achieving time, the rotation speed of the combustion fan is increased by the fan rotation speed control means based on the second fan rotation control data. To do
When the combustion time is shorter than the reference temperature achievement time and the liquid temperature in the liquid heater is low, the airflow of the combustion fan is controlled to the up side, thereby lowering the humidity of the exhaust gas and increasing the outdoor temperature of the steam in the exhaust gas. Therefore, it is possible to suppress the formation of dew on the liquid heater, and it is possible to achieve the same effects as those of the first invention.

Further, according to the third aspect of the present invention, a plurality of fans provided in advance by the fan rotation control means with fan rotation control data corresponding to the temperature of the liquid in the liquid heater detected by the liquid temperature detection means. By selecting from the rotation control data and performing rotation control of the combustion fan based on the selected fan rotation control data, in order to increase the rotation speed of the combustion fan as the temperature of the liquid decreases, The lower the temperature (the easier the dew condensation is likely to occur), the lower the humidity of the exhaust gas and the higher the outdoor temperature of the water vapor in the exhaust gas. Adhesion of dew condensation can be suppressed, and the same effect as the first invention can be obtained.

According to the third aspect of the present invention, as described above, as the temperature of the liquid in the liquid heater decreases, the rotation speed of the combustion fan increases, so that condensation forms on the liquid heater. In addition to suppressing the decrease in the thermal efficiency of the liquid heater due to an increase in the fan air volume, after starting the heating means of the liquid heater, the temperature of the liquid in the liquid heater is quickly brought closer to the set hot water supply temperature. Can be temperature.

Further, according to the fourth invention, a combustion device such as a cooling device, a heating device, or a cooling / heating device provided with a regenerator can exhibit the excellent effects of the first, second, or third invention. It can be a combustion device.

Further, according to the fifth aspect of the present invention, various types of combustion devices, such as water heaters, provided with a hot water heat exchanger can be used for the combustion apparatus having the excellent effects of the first, second or third invention. It can be a device.

Further, according to the sixth aspect, since the liquid temperature at the outlet side of the hot water supply heat exchanger can be detected by the liquid temperature detecting means, the first temperature is determined based on this temperature.
Alternatively, by performing control by the fan rotation speed control means of the second or third invention, it is possible to more reliably suppress the formation of dew on the hot water supply heat exchanger.

Further, according to the seventh aspect, the fan rotation speed control means provides a plurality of fans to which fan rotation control data corresponding to the temperature of incoming water to the hot water supply heat exchanger detected by the incoming water temperature detecting means is given in advance. By selecting from the rotation control data and performing the rotation control of the combustion fan based on the selected fan rotation control data, in order to increase the rotation speed of the combustion fan as the input water temperature decreases, the input water temperature is lowered. The lower the temperature of the water in the hot water supply heat exchanger, the lower the humidity of the exhaust gas and the higher the outdoor temperature of the steam in the exhaust gas, so that the dew condensation in the hot water supply heat exchanger can be suppressed.

Therefore, according to the seventh aspect of the present invention, the dew condensation on the hot water supply heat exchanger causes the exhaust passage to be blocked, and the combustion air of the heating means to be insufficient, resulting in incomplete combustion. Problems such as generation of soot can also be suppressed, and burner combustion itself cannot be performed due to blockage of the exhaust passage due to generation of soot and vicious circulation of soot generation due to incomplete combustion of the heating means, or the life of the hot water heat exchanger Can be suppressed, and the problem of corrosion of the hot water supply heat exchanger due to condensation (drain) can be suppressed, and similarly to the first, second, and third inventions, the service life is long. A combustion device can be realized.

Further, according to the eighth aspect, the condition that no condensation occurs in the hot water supply heat exchanger is satisfied and the heat efficiency of the hot water supply heat exchanger is set to a predetermined set efficiency for each fan rotation control data. A feedforward constant that can be calculated in advance by using a feedforward constant corresponding to the fan rotation control data selected by the fan rotation speed control unit to determine a feedforward supply heat amount supplied to the heating unit by the feedforward calculation unit. To
For example, if the highest possible thermal efficiency is set in advance as the set efficiency and the feedforward supply heat amount is obtained, hot water having a hot water temperature close to the hot water supply set temperature can be supplied by the feedforward supply heat amount. Can be made smaller.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing, by a block diagram, an example of a control configuration of an embodiment of a combustion device according to the present invention.

FIG. 2 is a flowchart showing an operation of the first embodiment of the combustion apparatus according to the present invention.

FIG. 3 is a graph showing an example of fan rotation control data provided in the first embodiment of the combustion apparatus according to the present invention.

FIG. 4 is a graph showing an example of fan rotation control data provided in a second embodiment of the combustion device according to the present invention.

FIG. 5 is a graph showing an example of fan rotation control data provided in a third embodiment of the combustion device according to the present invention.

FIG. 6 is a model diagram showing an example of a system configuration of a water heater as a combustion device.

FIG. 7 is an explanatory view schematically showing an embodiment of a hot water supply heat exchanger of a water heater and an example of a burner combustion section.

FIG. 8 is a cross-sectional explanatory view schematically showing another embodiment of the hot water supply heat exchanger of the water heater and the burner combustion section, and FIG. 8B is a schematic view showing an example of the configuration of the tank in the hot water supply heat exchanger. FIG.

FIG. 9 is a cross-sectional explanatory view schematically showing an example of a regenerator and a burner combustion unit used in a cooling and heating device and the like.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 burner 2 fin 3 regenerator 4 hot water supply heat exchanger 5 combustion fan 6 hot water supply heat exchanger hot water temperature sensor 8 fan rotation speed control means 9 feed forward operation unit 10 data storage unit 18 water input thermistor 21 combustion control unit

Claims (8)

[Claims] 1. A liquid heater for containing or flowing a liquid therein, and heating means for heating the liquid in the liquid heater,
A combustion fan having a combustion fan for supplying and exhausting combustion of the heating means, comprising a liquid temperature detecting means for detecting a temperature of the liquid, wherein a liquid temperature detected by the liquid temperature detecting means is predetermined. First fan rotation control data for controlling the number of revolutions of the combustion fan according to the required amount of combustion heat of the heating means when the temperature is equal to or higher than the reference temperature, and the heating means when the liquid temperature is lower than the reference temperature. And second fan rotation control data for controlling the number of revolutions of the combustion fan to increase the air flow in accordance with the required amount of combustion heat, and when the liquid temperature is equal to or higher than the reference temperature, the first fan The rotation control of the combustion fan is performed based on the rotation control data. When the liquid temperature is lower than the reference temperature, the combustion fan is controlled based on the second fan rotation control data. Combustion apparatus characterized by having a suppressing fan speed control means that condensation in the liquid heater is adhered by performing the rotation control of the fan. 2. A liquid heater for containing or circulating a liquid therein, and heating means for heating the liquid in the liquid heater,
In a combustion device provided with a combustion fan for supplying and discharging combustion of the heating means, the temperature of the liquid becomes a predetermined reference temperature from at least one of the liquid volume value and the liquid type in the liquid heater. Liquid temperature attainment time estimating means for estimating the reference temperature attainment time of the liquid temperature, and according to the required amount of combustion heat of the heating means when the burning time from the start of combustion of the heating means is equal to or longer than the reference temperature attaining time. First fan rotation control data for controlling the number of revolutions of the combustion fan, and increasing the number of revolutions of the combustion fan in accordance with the required amount of combustion heat of the heating means when the combustion time is less than the reference temperature achievement time. The second fan rotation control data to be controlled on the side is given in advance, and when the combustion time is equal to or longer than the reference temperature achievement time, the fuel is controlled based on the first fan rotation control data. Performs rotation control of the fan, when the burning time is less than the reference temperature achieved time the second
A combustion device comprising fan rotation speed control means for controlling the rotation of the combustion fan based on the fan rotation control data to suppress the formation of dew on the liquid heater. 3. A liquid heater for containing or circulating a liquid therein, and heating means for heating the liquid in the liquid heater,
A combustion fan having a combustion fan for supplying and exhausting combustion of the heating means, comprising a liquid temperature detection means for detecting a temperature of the liquid, a required amount of combustion heat of the heating means, a rotation speed of the combustion fan, Is provided in advance as a plurality of fan rotation control data corresponding to the temperature of the liquid, and selects the fan rotation control data corresponding to the temperature of the liquid detected by the liquid temperature detection means,
By controlling the rotation of the combustion fan based on the selected fan rotation control data, the rotation speed of the combustion fan is increased as the temperature of the liquid decreases, thereby suppressing the formation of condensation on the liquid heater. A combustion device comprising a fan speed control means. 4. The liquid heater according to claim 1, wherein the liquid in the liquid heater is heated by heating means to separate and regenerate different types of liquids contained in the liquid. A combustion device according to claim 2 or claim 3. 5. A water supply passage is connected to an inlet side of the liquid heater, and a hot water supply passage is connected to an outlet side of the liquid heater. The liquid heater heats water supplied from the water supply passage. 4. The combustion apparatus according to claim 1, wherein the heat exchanger is a hot water supply heat exchanger which is heated by means and sent to a hot water supply passage. 6. The combustion apparatus according to claim 5, wherein the liquid temperature detecting means is provided on an outlet side of the hot water supply heat exchanger. 7. A hot water supply heat exchanger comprising: a hot water supply heat exchanger; a heating means for the hot water supply heat exchanger; and a combustion fan for supplying and exhausting combustion of the heating means, wherein water supplied from a water supply passage is supplied to the hot water supply heat exchanger. In the combustion apparatus having a hot water supply function of heating the water to be supplied to the hot water supply passage and having a hot water supply function, the water supply temperature detection means for detecting the temperature of water supplied from the water supply passage is provided. Data relating to the number of revolutions of the combustion fan is given in advance as a plurality of fan rotation control data corresponding to the incoming water temperature, and the fan rotation control corresponding to the incoming water temperature detected by the incoming water temperature detecting means is provided. By selecting data and controlling the rotation of the combustion fan based on the selected fan rotation control data, the number of rotations of the combustion fan is increased as the incoming water temperature is reduced, so that the hot water supply heat exchange is performed. A combustion device comprising a fan speed control means for suppressing dew condensation on a heat exchanger. 8. For each fan rotation control data, a feedforward constant that can satisfy the condition that no dew condensation occurs in the hot water supply heat exchanger and set the heat efficiency of the hot water supply heat exchanger to a predetermined set efficiency is set in advance. And a feedforward calculation unit for calculating a feedforward supply heat amount supplied to the heating unit using a feedforward constant corresponding to the fan rotation control data selected by the fan rotation speed control unit. The combustion device according to claim 5, 6 or 7, wherein