JP2000046327A - Combustion appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a service life of a combustion appliance by reducing a burner burden by minimizing the frequency of turning on and off combustion operation of a burner. SOLUTION: The combustion appliance comprises a heat exchanger for producing hot water by combustion in a burner, a hot water temperature- measuring device, temperature-setting means, and a controller for controlling combustion operation. Combustion operation of the burner is turned on and off so that a preferable temperature range of hot water is controlled according to a state in use of the combustion appliance. When a measured temperature T of the temperature-measuring device is above a specified temperature in a specified time, the temperature range is enlarged by varying a combustion-off temperature Tof and a combustion-on temperature Ton. After that, when a measured temperature T is not reached to a combustion-off temperature Tof in another certain time, a temperature range after varied is returned to an initial temperature range. Such a control allows frequency of on-off of burner combustion to reduce even at the time of light load with a steep temperature increase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for circulating and supplying hot water to an external radiator such as a floor heating panel and a fan convector, and more particularly to a temperature control for hot water.

[0002]

2. Description of the Related Art In this type of combustion equipment, when the operation is started, a heat exchanger is heated by ignition of a burner to generate hot water, and hot water of a predetermined temperature based on a set temperature is sent to an external radiator. Supplied. Usually, a temperature detector (for example, a hot water thermistor) is provided in the hot water circulation path from the heat exchanger.
The combustion temperature of the burner is turned on / off by comparing the detected temperature of the temperature detector with the set temperature from a remote control panel or the like, so that the water temperature is adjusted to the set temperature with a predetermined temperature range. ing.

[0003] The above-described conventional hot water temperature adjustment control operation will be described with reference to the flowchart of FIG. still. The following combustion control is performed by a microcomputer (hereinafter, referred to as a microcomputer) mounted on a control device in the device.

According to the flowchart of FIG. 4, when the operation switch is turned on, the microcomputer reads the temperature detected by the temperature detector, and compares this with the set temperature. During the combustion operation of the device, when the detected temperature rises by a certain temperature (for example, 3 ° C.) from the set temperature, the combustion operation of the burner is stopped.
The microcomputer monitors the detected temperature even after the combustion is stopped, and when the detected temperature drops by a certain temperature (for example, 8 ° C.) from the set temperature, the microcomputer starts the combustion operation again. While the operation switch is on,
By continuously performing the on / off control of the combustion operation, the hot water temperature is always controlled with a substantially constant temperature range based on the set temperature. For example, in the case of the above conventional example,
When the set temperature is 70 ° C., the generated hot water has a temperature range of 11
The temperature is controlled in the range of 62 to 73 ° C based on 70 ° C.

[0005]

By the way, in a heating system using such a combustion device as a heat source device, various external radiators such as a floor heating panel and a fan convector are connected to the heating system, and these heat sources are provided by one heat source device. The hot water is circulated and supplied to the external radiator. Therefore, in such a heating system, since various use modes are implemented, the load fluctuation range of the heat source unit is also increased, and depending on the use conditions, the burner body is forced to operate extremely severely.

Specifically, when the load to be operated is small (the number of operation of the external radiator is small), the temperature rise gradient of the hot water by the heat exchanger is gentle, so that the burner combustion is turned on in the temperature adjustment control.・ The frequency of turning off is low, but if the load increases and the temperature rise gradient becomes steep, the frequency of turning on and off the burner combustion will increase, shortening the life of the burner body and various drive electric components for combustion control, etc. I will.

The present invention has been made in view of the above-mentioned inconveniences, and in the temperature adjustment control of hot water, the frequency of turning on / off the combustion operation of the burner is reduced as much as possible to reduce the load on the burner, thereby increasing the equipment cost. An object of the present invention is to provide a combustion device having a long life.

[0008]

That is, according to the present invention, a heat exchanger for generating hot water by a burner combustion operation, a hot water temperature detector, a temperature setting means,
A control device for controlling a combustion operation, wherein an on / off control of the combustion operation of the burner is performed so that a hot water temperature is adjusted with a constant reference temperature range with respect to a set temperature from the temperature setting means, and an external radiator is provided. In the combustion device for supplying hot water of a predetermined temperature to the control device, the control device is provided with control means for changing the reference temperature range according to the operating conditions of the combustion device.

According to the present invention, when the detected temperature of the temperature detector exceeds a predetermined temperature within a predetermined time, the control device can change the combustion-off temperature and the combustion-on temperature. Then, control means for increasing the reference temperature range is provided.

Further, according to the present invention, when the detected temperature of the temperature detector exceeds a predetermined temperature within a predetermined time, the control device changes the combustion off temperature and the combustion on temperature. Control means for increasing the temperature range and thereafter returning the variable temperature range to the initial reference temperature range if the detected temperature does not reach the combustion-off temperature within another predetermined time. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
A description will be given based on FIG. FIG. 1 is a diagram showing an internal structure of a heat source device as a combustion device to which the present invention is applied, and FIG. 2 is a diagram showing a controlled hot water temperature state.

In FIG. 1, a heat exchanger 3 having an exhaust box 2 connected to a front end thereof and a combustion chamber 4 formed at a rear end, and a burner 5 for vaporizing and burning liquid fuel to heat the heat exchanger 3 And a burner blower 6 for supplying combustion air to the burner 5 are integrally assembled to each other to form a heating unit, which is fixed to an upper center in the exterior body 1. The burner 5 integrally accommodates an atomizing and stirring device (not shown) for liquid fuel, a spark plug 8 for ignition, a frame rod 11 for flame detection, and the like inside a hollow cylinder (a vaporizing cylinder). It is configured.

Further, a cistern tank 10 for temporarily storing hot water from the heat exchanger 3 is provided in parallel with the heating unit. On the other hand, an oil leveler 13 for storing a liquid fuel for combustion supplied from a fuel tank (not shown) installed outside the apparatus is mounted and fixed on the right side of the base 12 at the bottom. An electromagnetic pump 14 for sucking the liquid fuel in the oil leveler 13 and supplying the liquid fuel to the burner 5 is connected to an upper portion thereof, and the liquid fuel is supplied into the burner 5 via an oil feed pipe 15 connected thereto. Is done. Further, hot water heat-exchanged by the heat exchanger 3 is passed through circulation pipes such as the outgoing pipe 16 and the return pipe 17 to the left side below the cistern tank 10 on the gantry 12 to the outside such as a floor heating panel and a fan convector. A circulating pump 7 for circulating and supplying a radiator (not shown) is provided.

In addition, the outgoing pipe 16 near the outlet of the heat exchanger 3
Is provided with a hot water thermistor 18 as a temperature detector for detecting the temperature of incoming hot water, and its output line is connected to a control device 20 of an electrical box 19 installed in the center of the machine.

An external radiator remote controller 30 having various switches including an operation switch, temperature setting means, and the like is connected to the control device 20.

Next, an outline of the operation of the combustion operation of the heat source unit will be described. In the above configuration, when the combustion operation is started, first, the burner blower 6 operates, and the combustion air drawn in from the outside is converted into primary air. It is supplied into the vaporizing cylinder of the burner 5. Here, when the electromagnetic pump 14 is operated, the oil feed pipe 1
5 is vaporized in the vaporization cylinder, and the liquid fuel is mixed with the primary air. This mixed gas is ignited by the discharge spark of the ignition plug 8, and the burner 5 forms a flame in the front combustion chamber 4 and starts combustion. Further, the high-temperature exhaust gas combusted in the combustion chamber 4 flows into the heat exchanger 3, where it undergoes heat exchange with the returned hot water that has been radiated from the return-side connection port 22 and is exhausted through the exhaust box 2. It is discharged out of the exterior body 1 from the top 9. The return warm water heated in this way is temporarily stored in the cistern tank 10 through the outgoing pipe 16 and then returned to the circulation pump 7 again.
Circulates and is supplied to the external radiator from the connection port 21 through the external piping by the drive of the radiator. The combustion operation is controlled by a microcomputer of a control device 20 provided in the electrical box 19, and the control device 20 includes control means for adjusting the temperature of the hot water described below.

The control operation will be described with reference to FIG.
In this embodiment, the combustion operation is started at a set temperature of 60 ° C.

When the operation switch is turned on, the microcomputer reads the detected temperature T of the temperature thermistor 18 and compares it with the temperature set by the temperature setting means of the remote controller 30.

The first combustion off temperature Tof1 after the start of the combustion operation is set to the set temperature (60 ° C.) + 3 ° C., and the next combustion on temperature Ton1 is set to the set temperature −8 ° C. The first setting of Tof1 and Ton1 is to set the temperature range of the hot water temperature (Tof1 to Ton1) to the same reference temperature range (11 ° C.) as in the conventional control (see the section in FIG. 2).

Next, the second and subsequent combustion-off temperatures Tof
Set 2 to the set temperature + 10 ° C. With this setting, the detected temperature T becomes less than the combustion off temperature To within 10 minutes after the combustion is turned on.
When f2 is reached, the next combustion-on temperature Ton2 is reset to the set temperature -10 ° C (see the section in FIG. 2). In this case, the temperature range of the hot water temperature (Tof2 to Ton2) is 20 ° C., which is about twice the conventional reference temperature range of 11 ° C.

On the other hand, if the detected temperature T does not rise to the combustion off temperature Tof2 (ie, the set temperature + 10 ° C.) within 10 minutes, the next combustion off temperature is set to the set temperature +3.
Reset to ° C. Then, the value of the next combustion-on temperature Ton3 is determined based on the detected temperature T at this point.

That is, as shown in the section of FIG. 2, if the detected temperature T exceeds the set temperature + 3 ° C. after 10 minutes,
At that time (Tof3), the combustion is turned off, and the next combustion-on temperature Ton3 is maintained at the set temperature -10 ° C.

On the other hand, as shown in the section of FIG.
If the detected temperature T has not reached the set temperature + 3 ° C. after the lapse of minutes, the combustion is continued as it is, and when the detected temperature reaches the set temperature + 3 ° C. (Tof4), the combustion is turned off and the next combustion is turned on. The temperature Ton4 is set to the set temperature −8 ° C.

As described above, in the present embodiment, when the detected temperature exceeds a predetermined temperature within a certain time, the combustion width is changed from the normal range as indicated by the section by varying the combustion off temperature and the combustion on temperature. It is possible to reduce the frequency of turning on / off the combustion operation of the burner and extend the life of the combustion equipment.

When the detected temperature does not exceed the predetermined temperature within a certain time (in the case of a heavy load), the temperature range of the hot water temperature is reduced again, so that efficient and appropriate temperature adjustment can be achieved. It becomes possible.

In the temperature adjustment control, the set temperature is 70 ° C.
In the following case, when the set temperature exceeds 70 ° C., the conventional temperature adjustment control is applied. This is because the temperature is usually set to 70 ° C. or more when the number of the external radiators to be operated is large. When such a heavy load is used, the temperature rise gradient is gentle and the on / off frequency of the combustion operation is high. This is because the load on the burner is reduced.

FIG. 3 is a flowchart showing one embodiment of the temperature adjustment control.

[0028]

As described above, according to the first aspect of the present invention, in the temperature control of the combustion equipment which is performed by turning on / off the combustion operation of the burner, the hot water controlled by the use condition of the equipment. Because the reference temperature range of the temperature is changed, severe operation is forced on the combustion equipment depending on the size of the load (the number of external radiators to be operated), and the conventional control that overloads the burner is applied. Inconvenience can be eliminated as much as possible.

According to the second aspect of the present invention, when the temperature of the hot water exceeds a predetermined temperature within a predetermined time, the combustion-off temperature and the combustion-on temperature are varied. As the reference temperature range was increased,
In the conventional control, the frequency of on / off can be reduced even under a light load with a steep temperature rise gradient that increases the on / off of burner combustion, so that the load on the burner can be reduced and the life of the combustion equipment can be improved.

Further, according to the present invention, when the temperature of the hot water exceeds a predetermined temperature within a predetermined time, the combustion OFF temperature and the combustion ON temperature are varied to increase the temperature range. Thereafter, if the hot water temperature does not reach the combustion-off temperature within another fixed time, the temperature range is returned to the initial reference temperature range, so that the burner combustion ON / OFF frequency at light load is reduced as described above. The temperature can be reduced and the temperature can be adjusted efficiently without being affected by the load fluctuation occurring during the combustion operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal structure of a heat source device to which the present invention is applied.

FIG. 2 is a diagram showing a state of hot water temperature controlled by the present invention.

FIG. 3 is a flowchart illustrating temperature adjustment control of hot water according to the present invention.

FIG. 4 is a flowchart showing a conventional hot water temperature adjustment control.

[Explanation of symbols]

 Reference Signs List 3 heat exchanger 5 burner 18 temperature detector (hot water thermistor) 20 controller 32 temperature setting means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichiro Yanagida 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Masato Ima 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Yuichi Yoshizawa 2-5-1 Keihanhondori, Moriguchi-shi, Osaka 2-72 Sanyo Electric Co., Ltd. (72) Inventor Toshinari Minami 2, Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. F term (reference) 3K005 AA06 AB13 AC05 BA01 DA01 EB00

Claims (3)

[Claims] 1. A heat exchanger for generating hot water by a combustion operation of a burner, a temperature detector of the hot water, a temperature setting means, and a control device for controlling the combustion operation, wherein a set temperature from the temperature setting means is provided. A combustion device that controls on / off the combustion operation of the burner and supplies hot water of a predetermined temperature to an external radiator such that the hot water temperature is adjusted with a constant reference temperature range. Combustion equipment comprising control means for changing the reference temperature range according to the use conditions of the above. 2. The control device according to claim 1, wherein when the temperature detected by the temperature detector exceeds a predetermined temperature within a predetermined time, the control device changes a combustion off temperature and a combustion on temperature to increase the reference temperature range. The combustion device according to claim 1, comprising: 3. When the detected temperature of the temperature detector exceeds a predetermined temperature within a predetermined time, the control device varies a combustion off temperature and a combustion on temperature to increase the temperature range, and thereafter, 2. The combustion apparatus according to claim 1, further comprising a control unit that returns the temperature range after the change to the initial reference temperature range when the detected temperature does not reach the combustion-off temperature within another predetermined time. machine.