JPH10122553A - Method for discriminating gas supplying/discharging pipe-fixing system and combustion device for performing the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an accurate discrimination whether a gas supplying/discharging pipe fixing system is a double-pipe system or two-pipe system by a method wherein a fixing system for a gas supplying pipe and a gas discharging pipe is discriminated as a double-pipe system when a temperature of the supplied gas is higher than a predetermined temperature and in turn it is discriminated as a two-pipe system when a temperature of the supplied gas is lower than a predetermined temperature. SOLUTION: A temperature sensing means such as a thermistor or the like is fixed to an appropriate portion of a gas supplying passage 50. The temperature sensing means measures a temperature of the supplied gas. Then, a combustion device 1 compares a measured gas supplying temperature with a predetermined discriminating temperature. The discrimination temperature is set to be higher than a temperature of the surrounding atmosphere and further set to be lower than a temperature of the supplies gas in the case of applying double-pipe system during combustion. Then, if the measured temperature of the supplied gas is higher than the discrimination temperature, the combustion device 1 discriminates that the gas supplying or gas discharging pipe fixing system is of a double-pipe system, and in turn if the temperature is lower than the discrimination temperature, it discriminates that the system is of a two-pipe system. The combustion device 1 performs a combustion control which is different in the case of the double-pipe system and of the two-pipe system, and the most- suitable combustion state is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus such as a water heater or a bath kettle, and more particularly, to a method for mounting a supply / exhaust pipe attached to a combustion apparatus.

[0002]

2. Description of the Related Art Generally, a combustion apparatus such as an FF type (forced supply / exhaust type) water heater is provided with an air supply pipe for sending air into a combustion chamber for burning gas and an exhaust gas for discharging exhaust gas generated by combustion to the outside. Has a tube.

[0003] These air supply pipe and exhaust pipe systems include a so-called double tube system and a double tube system. FIG. 1 is a schematic view of a supply / exhaust pipe attached to a combustion apparatus by a double pipe method, and FIG. 2 is a schematic view of a supply / exhaust pipe attached to a combustion apparatus by a double pipe method. It is. These will be described below with reference to the drawings.

[0004] The supply / exhaust pipe attached to the combustion apparatus 1 by the double pipe system shown in FIG. 1 comprises a first pipe 100 and a second pipe 200. The second tube 200 is concentric and the diameter of the second tube 200 is smaller than the diameter of the first tube 100. And the second tube 2
00 is used as an exhaust passage, and the inside of the first pipe 100 except for the second pipe 200 is used as an air supply passage. The second pipe 200 is used as an exhaust passage because the exhaust passage 200 is not exposed to the outside even if the exhaust gas temperature becomes high, and accidents such as burns can be prevented. This is because, even when the gas leaks from the second pipe 200, the gas is sucked by the air supply passage portion of the first pipe 100, so that the exhaust gas does not leak into the room. In this regard, the double pipe method is superior in safety measures compared to the two pipe method described below.

[0005] The supply / exhaust pipe attached to the combustion apparatus 1 by the two-pipe system shown in FIG. 2 comprises a first pipe 110 and a second pipe 220 similarly to the double-pipe system. Unlike the double pipe system, the two pipes having almost the same diameter are separately arranged. Which is the air supply pipe or the exhaust pipe is determined in advance.

[0006] By the way, the double pipe system is used for piping.
Because the pipe is simpler and more compact than the two-pipe system, the two-pipe method is used only when the supply and exhaust pipes are already installed in the house with the two-pipe method and when it is unavoidable on the piping. . Therefore, as shown in FIG. 2, usually, the attachment part of the supply / exhaust pipe (not shown) in the combustion device 1 is designed so that the double pipe 400 is attached. Therefore, when attaching a two-pipe consisting of the first pipe 110 and the second pipe 220 to the combustion device 1, an adapter 300 for converting the two-pipe into a double pipe is required. It is preferable that the supply / exhaust pipe is a double pipe unless there is any trouble. Therefore, in order to make the double pipe 500 from the portion where the trouble is eliminated to the end opposite to the combustion device, the same as above. Adapter 310 is attached.

Whether the supply / exhaust pipe attached to the combustion apparatus 1 is a double pipe type or a double pipe type is determined by setting the number of revolutions of the combustion fan and controlling the gas supply amount as described below. In some cases, the control of the combustion device may be different. Therefore, conventionally, a person who installs the combustion apparatus switches and inputs information on which type of supply / exhaust pipe is attached to the combustion apparatus by using a changeover switch attached to the combustion apparatus when installing the supply / exhaust pipe. . And
According to the setting of the switch, the combustion device was controlled for combustion.

That is, for example, in setting the number of revolutions of the combustion fan, the respective cross-sectional areas of the supply passage and the exhaust passage in the double pipe system are designed to be almost the same as those in the double pipe system. As described above, the two pipes in the case of the two-pipe system are not directly connected to the combustion device but are connected via an adapter, so that the air supply resistance and the exhaust resistance are double pipes. Higher than the system. Therefore, in the case of the double pipe system, in order to maintain the same air supply and exhaust amount as in the case of the double pipe system, the rotation speed of the combustion fan controlling the supply and exhaust of the combustion device is increased by the double pipe system. It is set higher than the system.

Further, since the air supply passage in the double pipe system is adjacent to the exhaust passage around the second pipe of the double tube system, heat of the exhaust gas having a high temperature is introduced into the air supply passage. The moving air flowing through the air supply passage is warmed. On the other hand, since the two-pipe air supply pipe and the exhaust pipe are separately installed separately, the heat of the exhaust gas does not transfer to the air supply passage, and the air in the air supply passage is heated by the heat of the exhaust gas. Never. Here, a difference occurs between the temperature of the supply air in the double pipe system and the temperature of the supply air in the double pipe system, and as a result, the amount of gas supply necessary to obtain a predetermined amount of heat also differs. This point is also reflected in the combustion control.

[0010]

As described above, since the control of the combustion device is different depending on the two mounting methods, the setting of the changeover switch mounted in the combustion device must be made accurately. However, as described above, since the setting of the switch is performed artificially,
It may be set by mistake.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for a combustion apparatus to accurately determine whether a supply / exhaust pipe mounting method is a double pipe method or a double pipe method.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to measure a supply air temperature of a supply pipe of a combustion apparatus, and when the supply air temperature is equal to or higher than a predetermined temperature, the supply pipe and exhaust pipe of the combustion apparatus. Is determined to be a double pipe system, and when the supply air temperature is lower than the predetermined temperature, it is determined that the mounting system is a double pipe system. This is achieved by providing a method of judging the method, in order to achieve the method, a temperature detecting means for measuring an air supply temperature of an air supply pipe of a combustion device, and the supply air temperature measured by the temperature detecting means. Is equal to or higher than a predetermined temperature, it is determined that the mounting method of the air supply pipe and the exhaust pipe is a double pipe method, and when the air supply temperature is lower than a predetermined temperature, the mounting method is a two pipe method. Judgment means for judging that Baked apparatus is provided.

Further, an object of the present invention is to measure a supply air temperature of a combustion device, and when the supply air temperature is equal to or higher than a predetermined temperature,
This is achieved by providing a method for determining a method of attaching a supply / exhaust pipe, wherein the method of attaching a supply pipe and an exhaust pipe of the combustion apparatus is a double pipe method. Therefore, a temperature detecting means for measuring the supply air temperature of the combustion device, and when the supply air temperature measured by the temperature detecting means is equal to or higher than a predetermined temperature, the supply / exhaust pipe mounting method is a double pipe method. And a judging means for judging.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. However, the technical scope of the present invention is not limited to this embodiment.

First, a combustion device to which an air supply pipe and an exhaust pipe are attached will be described. FIG. 3 is a diagram illustrating a configuration of an FF type water heater that is an example of such a combustion device.

When a hot water tap (not shown) is opened, water passes through the water quantity sensor 12 and passes through the hot water heat exchanger 16 and the bypass passage 1.
When the water flow reaches a certain level or more, the flow rate sensor 12 detects the flow rate. Then, the combustion fan 24 that sucks air from the air supply passage 50 and discharges the exhaust gas after combustion from the exhaust passage 52 rotates, and the prepurge starts. Subsequently, at the same time as the ignition of the ignition plug 18, the original gas solenoid valve 28 and the gas solenoid valve 30 are opened, and gas flows through the gas proportional valve 32.

When the burner 22 is ignited, the flame is detected by the flame rod 20 and combustion starts. Hot water supply heat exchanger 1
The hot water heated in 6 and the water passed through the bypass passage 14 are mixed and the hot water flows into the hot water tap. And the hot water thermistor 36
The opening degree of the gas proportional valve 32 and the rotation speed of the combustion fan 24 are controlled so that the temperature of the combustion fan 24 becomes the set temperature. If the ignition is not performed within a predetermined time, the safety circuit is activated, the original gas solenoid valve 28 and the gas solenoid valve 30 are shut off, and the discharge is stopped. If the temperature of the hot water changes due to a change in the amount of hot water, the amount of water, or the pressure of the water during use of the hot water supply, the set temperature difference is calculated from the temperature of the hot water, the temperature of the incoming water, and the amount of the water, and the difference is calculated by the gas proportional valve 32.
It is transmitted to the water amount control valve 38 and is controlled so as to be maintained at the set temperature.

The combustion fan 24 is provided with a Hall IC 26 for detecting the number of rotations of the fan, and the rotation of the combustion fan 24 determines an optimum air volume so as to generate complete combustion in accordance with the gas supply amount. Is controlled to be sent to

FIG. 4 is a graph showing the relationship between the supply air temperature during combustion and the length of the supply / exhaust pipe. As is clear from this graph, during combustion, the supply air temperature in the double pipe system is always higher than the supply air temperature in the double pipe system. That is, in the case of the two-pipe system, since the exhaust passage and the air supply passage are arranged apart from each other, the heat of the high-temperature exhaust gas flowing through the exhaust passage like a double pipe does not move to the air supply passage side. Because.
Moreover, in the case of a double pipe, the supply air temperature remains substantially equal to the outside air temperature regardless of the length of the supply and exhaust pipes. On the other hand, in the case of the double pipe system, since the exhaust passage is disposed adjacent to the periphery of the air supply passage, the heat of the exhaust gas moves to the air flowing through the air supply passage, and the air supply temperature rises. Then, as shown in the graph, the longer the supply / exhaust pipe, the greater the amount of heat transfer from the exhaust gas flowing through the exhaust passage to the air flowing through the supply passage, so that the supply air temperature further increases.

The abscissa of the graph shown in FIG. 4 may use the combustion capacity of the combustion device instead of the length of the supply / exhaust pipe (see parentheses in FIG. 4). In other words, the larger the combustion capacity, the higher the temperature of the exhaust gas.
The amount of heat transferred to the air flowing through the air supply passage increases, and the air supply temperature rises.

As described above, the supply air temperature during combustion differs between the double pipe system and the double pipe system. Therefore, it is possible to determine whether the supply / exhaust pipe mounting method is the double pipe method or the double pipe method by the following method.

First, a temperature detecting means such as a thermistor is attached to an appropriate portion of the air supply passage, and the temperature detecting means measures the air supply temperature.

Next, the combustion device compares the measured supply air temperature with a predetermined judgment temperature. The determination temperature is set higher than the outside air temperature and lower than the supply air temperature in the case of the double pipe system during combustion. If the measured supply air temperature is equal to or higher than the determination temperature, the combustion device determines that the supply / exhaust pipe mounting method is the double pipe method, and if the temperature is lower than the determination temperature, the combustion apparatus uses the double pipe method. Judge that there is.

In order to make these comparisons and judgments, the combustion apparatus is provided with judgment means such as a microcomputer. Then, based on the above determination, the combustion device performs different combustion control depending on the case of the double pipe system and the case of the double pipe system, and maintains an optimal combustion state. In particular,
From the table values for combustion control stored in the ROM in the microcomputer, the data for the double pipe and the data for the double pipe are appropriately selected by the judging means.

Also, for example, a combustion apparatus is set in advance so that combustion control in the case of a two-pipe system is performed, and when it is determined that the supply air temperature is equal to or higher than the determination temperature,
ROC in microcomputer
The data for the double pipe is selected from the table values stored in M, the combustion control in the case of the double pipe method is performed, and when the temperature is lower than the determination temperature, in particular, the double pipe method is not determined. In addition, the combustion control that is appropriately initialized may be performed. In particular, for example, if the combustion device main body of the FE type (forced exhaust type) water heater having no air supply pipe and the above-mentioned FF type water heater has almost the same specification, the microcomputer is mounted on the combustion device main body. be able to. That is, when the combustion device main body is used as an FE type water heater, there is no air supply pipe, so there is no case where the combustion apparatus becomes a double pipe, and the air supply temperature does not exceed the determination temperature. Therefore, the above determination is not made, and the combustion control in the case of the initially set FE system is always performed. Further, when used as an FF type water heater, the above determination is made by previously setting the combustion control in the case of the double pipe system as described above. by this,
The microcomputer can be shared, and the cost can be reduced.

[0026]

As described above, according to the present invention, the combustion apparatus itself can accurately determine the mounting method of the two supply and exhaust pipes. This eliminates the necessity of the judgment of the mounting method, which was conventionally performed artificially when the combustion device was installed, and eliminates an erroneous judgment.

As described above, since the combustion device itself can determine the installation method of the supply / exhaust pipe, the changeover switch mounted in the combustion device becomes unnecessary. The determination means provided in the combustion apparatus may use the present invention as an auxiliary means for correcting the setting when the switch is erroneously set.

[Brief description of the drawings]

FIG. 1 is a schematic view of a supply / exhaust pipe attached to a combustion apparatus by a double pipe system.

FIG. 2 is a schematic view of a supply / exhaust pipe attached to a combustion device by a two-pipe system.

FIG. 3 is a diagram illustrating a configuration of a water heater that is an example of a combustion device.

FIG. 4 is a graph showing a relationship between a supply air temperature during combustion and a length of a supply / exhaust pipe (or a combustion capacity of a combustion device).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion device 100 First pipe 110 First pipe 200 Second pipe 220 Second pipe 300 Adapter 310 Adapter 400 Double pipe 500 Double pipe 12 Water quantity sensor 14 Bypass passage 16 Hot water heat exchanger 18 Spark plug 20 Flame rod 22 Burner 24 Combustion fan 26 Hall IC 28 Primary gas solenoid valve 30 Gas solenoid valve 32 Gas proportional valve 34 Inlet thermistor 36 Outlet thermistor 38 Water volume control valve 40 CO sensor 50 Air supply passage 52 Exhaust passage

Claims (4)

[Claims] An air supply temperature from an air supply pipe of a combustion device is measured, and when the air supply temperature is equal to or higher than a predetermined temperature, a method of attaching the air supply pipe and the exhaust pipe of the combustion apparatus is a double pipe method. A method for determining a supply / exhaust pipe attachment method of a combustion device, wherein it is determined that there is an air supply temperature, and when the supply air temperature is lower than the predetermined temperature, the attachment method is determined to be a double pipe method. 2. A temperature detecting means for measuring an air supply temperature from an air supply pipe of the combustion device, and if the air supply temperature measured by the temperature detection means is equal to or higher than a predetermined temperature, the supply of the combustion device is performed. A combustion device having a judging means for judging that the mounting method of the trachea and the exhaust pipe is a double pipe method, and judging that the mounting method is a double pipe method when the supply air temperature is lower than a predetermined temperature; . 3. A method of measuring a supply air temperature of a combustion device, and when the supply air temperature is equal to or higher than a predetermined temperature, judging that a mounting method of an air supply pipe and an exhaust pipe of the combustion apparatus is a double pipe method. A method for judging a method of installing a supply / exhaust pipe of a combustion device, comprising: 4. A temperature detecting means for measuring an air supply temperature of the combustion device, and, if the air supply temperature measured by the temperature detection means is equal to or higher than a predetermined temperature, attaching an air supply pipe and an exhaust pipe of the combustion apparatus. A combustion unit having a judging means for judging that the system is a double tube system.