JPH0325031Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a safe combustion device for gas appliances that uses a CO sensor or other incomplete combustion detection element.

(Prior Art) Conventionally, for example, as a gas hot water supply system, as shown in FIG. The exhaust gas from the combustion parts is discharged through a common exhaust pipe d, and a CO sensor e is installed on one side of the base of the exhaust pipe d to detect the concentration of CO gas in the exhaust from each combustion part. known.

(Problem to be solved by the invention) However, according to the above-mentioned conventional method, the exhaust gas from one hot water supply combustion section c mainly uses the side where the CO sensor e is installed as a flow path, so that CO
Gas can be detected, but the flow of exhaust gas from the other hot water heating combustion section b tends to flow on the opposite side to the CO sensor e, making the detection operation by the CO sensor e inaccurate. In order to accurately detect the exhaust gas from combustion sections b and c, a total of two sensors were required, one for each.

Therefore, a diffusion chamber is formed between the exhaust pipe d and both combustion parts b and c, and a CO sensor e is provided in the diffusion chamber, and a diffusion chamber communicating with both combustion parts b and c and the exhaust pipe d is formed. By narrowing the exhaust inlet and outlet with respect to the diffusion chamber, when the exhaust gas from each combustion section flows into the diffusion chamber from the exhaust inlet, the exhaust gas diffuses into the diffusion chamber into a turbulent flow, temporarily causing the exhaust gas to flow inside the diffusion chamber. This causes a stagnation phenomenon in the exhaust gas, and even with a single CO sensor e installed biased to one side, the contact with the exhaust gas from each combustion section is activated, and the CO gas generated by the single CO sensor e is activated. It may be possible to ensure that the concentration is detected accurately, but according to this, it would be good if both combustion sections b and c were operated simultaneously.
If both combustion sections b and c are operated separately as needed, for example for hot water supply and bath use, when only one is operated, the inside of the combustion section at rest is attracted by the exhaust gas flowing into the diffusion chamber. The oxygen in the air tends to reduce the detection performance of the CO sensor, which is undesirable.

(Means for Solving the Problems) The present invention attempts to eliminate the above-mentioned disadvantages by providing a combustion section within the frame casing, and exhausting the exhaust from each combustion section through a common exhaust stack. In this gas appliance, a diffusion chamber is formed between the base of the exhaust stack and both combustion sections, a CO sensor or other incomplete combustion detection element is installed in the diffusion chamber, and both combustion sections and exhaust In a type in which the exhaust inlet and outlet of the diffusion chamber communicating with the cylinder are narrowed into the diffusion chamber and both combustion sections are operated individually, a baffle plate is installed in front of the exhaust inlet to ventilate both sides. It is characterized by leaving a gap.

(Function) The present invention has the above configuration, and since the baffle plate is provided in front of the exhaust inlet of the diffusion chamber with a ventilation gap left on both sides, when one combustion section is in operation and the other combustion section is stopped, Part of the exhaust gas from one combustion section that is in operation is guided by the baffle plate and flows along the baffle before heading toward the exhaust inlet, so this flow of exhaust gas induces a flow inside the other combustion section that is not operating. The flow of air into the diffusion chamber is restricted, and even when the other combustion section is in operation, the flow of air into the diffusion chamber from one combustion section that is inactive is restricted, and as a result, the induced air prevents the detection of incomplete combustion detection elements. There is no possibility that the operation will be degraded.

(Embodiment) The embodiment shown in Fig. 1 shows an arrangement in which two combustion sections, a first combustion section 1 and a second combustion section 2, are installed in a frame housing, and these combustion sections are operated individually and independently. Since this is possible, it is possible to switch between them so that when one burns, the other burns out, and the exhaust gas from each combustion section is discharged from a common exhaust stack 3. A diffusion chamber 4 is formed between the base of the exhaust stack 3 and both combustion sections 1 and 2, and a CO sensor 5 as an incomplete combustion detection element is installed inside the diffusion chamber 4.

The diffusion chamber 4 communicates with both combustion sections 1 and 2 through a lower exhaust inlet 6 and with the exhaust stack 3 through an upper exhaust outlet 7, and these exhaust inlets 6 and 7 are connected to the diffusion chamber 4. The opening was narrowed to the inside to restrict the circulating exhaust gas.

In the above configuration, if both combustion sections 1 and 2 are operated simultaneously, when the exhaust gas from combustion sections 1 and 2 flows into the diffusion chamber 4, the exhaust gas is Instead, the gas diffuses turbulently in the diffusion chamber 4 and stays in the diffusion chamber 4, causing a temporary stagnation phenomenon, so that the contact between the exhaust gas and the CO sensor 5 becomes active, and the CO gas detection operation is performed reliably. If both combustion sections 1 and 2 are operated individually as in the present invention, the exhaust gas flowing into the diffusion chamber 4 during one exhaust operation is induced to entrain the air in the combustion section that is at rest. However, the oxygen in the air tends to reduce the detection operation of the CO sensor 5.

In order to prevent this, baffle plates 9 are provided horizontally in front of the exhaust inlet 6 of the diffusion chamber 4, leaving ventilation gaps on both sides, as shown in FIG. Therefore, as shown in FIG. 1, during operation in the second combustion section 2, a part of the exhaust gas is guided by the baffle plate 9 in front of the exhaust inlet 6 of the diffusion chamber 4, and a horizontal flow is generated along the baffle plate 9. After that, the horizontal flow of the exhaust gas restricts the induced air from the inactive first combustion section 1 from flowing into the diffusion chamber 4 .

FIG. 2 shows another embodiment of the present invention, in which a guide plate 8 is spirally provided along the inner wall of the diffusion chamber 4 in the embodiment described above, and the exhaust gas flowing into the diffusion chamber 4 is guided. It is guided in a spiral manner along the plate 8.
This shows what makes contact with the CO sensor 5 more reliable.

Incidentally, the baffle plate 9 in both of the above embodiments not only prevents the induced air from the combustion section that is not in use, but also diffuses the exhaust gas itself from the combustion section that is in operation before it flows into the diffusion chamber 4. It also serves to further enhance the diffusion effect within the diffusion chamber 4.

(Effects of the invention) According to the invention, a baffle plate was provided in front of the exhaust inlet of the diffusion chamber, leaving a ventilation gap on both sides.
In the case where both combustion sections are operated individually, when one combustion section is in operation, the flow of induced air from the other combustion section, which is inactive, into the diffusion chamber is restricted, and incomplete combustion is detected due to the induced air. This has the effect of preventing the detection operation of the element from being degraded.

[Brief explanation of the drawing]

FIG. 1 is a cut-away side view showing one embodiment of the present invention, FIG. 2 is a cut-away side view showing another embodiment of the present invention, and FIG. 3 is a cut-away side view of a conventional device. 1...First combustion section, 2...Second combustion section, 3...
Exhaust pipe, 4...diffusion chamber, 5...CO sensor (incomplete combustion detection element), 6...exhaust inlet, 7...exhaust outlet, 9...baffle plate.

Claims (1)

[Scope of utility model registration request] A gas appliance in which a combustion section is installed in a frame housing and the exhaust from each combustion section is exhausted through a common exhaust stack, and a diffusion chamber is provided between the base of the exhaust stack and both combustion sections. A CO sensor or other incomplete combustion detection element is provided in the diffusion chamber, and the exhaust inlet and outlet of the diffusion chamber that communicate with both combustion sections and the exhaust stack are narrowed into the diffusion chamber to prevent both combustion. 1. A safe combustion device for a gas appliance, characterized in that the parts are operated individually, and a baffle plate is provided in front of the exhaust inlet with a ventilation gap left on both sides.